WO1999028780A1 - Illuminateur a lumiere polarisee et affichage d'images de type a projection - Google Patents
Illuminateur a lumiere polarisee et affichage d'images de type a projection Download PDFInfo
- Publication number
- WO1999028780A1 WO1999028780A1 PCT/JP1998/005279 JP9805279W WO9928780A1 WO 1999028780 A1 WO1999028780 A1 WO 1999028780A1 JP 9805279 W JP9805279 W JP 9805279W WO 9928780 A1 WO9928780 A1 WO 9928780A1
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- WIPO (PCT)
- Prior art keywords
- light
- polarization
- polarized light
- lens
- lens plate
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
- G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
Definitions
- the present invention relates to a polarized light illuminating device for uniformly illuminating a rectangular area using polarized light having a uniform polarization direction. Further, the present invention relates to a projection type image display device which modulates polarized light emitted from the polarized light illuminating device by a light valve and projects an enlarged image on a screen.
- Projection-type image display devices that use liquid crystal panels for light valves are rapidly forming a market as presentation tools because they are particularly small, lightweight, and easy to install. It is also expected to be widely used in the consumer field because of its smaller size, lighter weight, and superior image quality uniformity to surrounding areas compared to conventional CRT projection type projection televisions.
- LCD projectors are two market needs: high brightness and low cost.
- the light source section 9110 includes a light source lamp 911 and a reflector 912. Light with a random polarization direction emitted from the light source lamp 911 is reflected in one direction by the reflector 912 and enters the first lens plate 920 of the integrator optical system.
- the first lens plate 920 is a complex lens body in which a large number of minute rectangular lenses 921 are arranged. The light incident here is condensed by the individual microlenses 9 21.
- the light source image formed by the minute lens 921 is formed on the second lens plate 9330.
- the second lens plate 9330 includes a condensing lens array 931 located near the position where the light source image is formed, and a polarization separating prism array 933 composed of an aggregate of polarizing beam splitters 934.
- a ⁇ ⁇ 2 phase difference plate 935 and an exit-side lens 937 A light source image formed by the microlenses 9 21 on the first lens plate 9 20 is formed on the condenser lens array 9 31, and the light is split by the polarizing beam splitter 9 34 according to the polarization direction. You.
- the polarization-separated light beams are aligned in polarization direction by the ⁇ 2 phase difference plate 935, and then pass through the exit lens 937 to illuminate the illumination area 9400. As described above, it is possible to efficiently align the polarization directions of light in which the polarization directions of the light source lamps 911 are random.
- the polarizing beam splitter 934 is composed of a prism having a parallelogram cross section. Because it is advantageous in terms of processing, prisms with this shape are currently used in products. Furthermore, in order to process this inexpensively, it is desirable that the thickness of the polarizing beam splitter 934 in the system optical axis 952 direction (the distance between two opposing surfaces orthogonal to the system optical axis) are all equal. . As a result, all the prisms constituting the polarizing beam splitter have the same shape.
- the prism shape is adjusted to the largest one near the center (near the system optical axis) of the light source images formed on the condenser lens array 931, a relatively small light source image formed around the periphery is obtained. Useless parts occur. As a result, the second lens plate 9330 itself becomes large, and thus the illumination light has a problem that the illumination F-number is small and the incident angle is large.
- the present invention solves the above-mentioned conventional problems and reduces the spread of illumination light (light). It is an object of the present invention to provide a polarized light illuminating device capable of converting a random light beam from a light source into an arbitrary polarization direction. Another object of the present invention is to provide a projection-type image display device that has high light use efficiency, can obtain a high-luminance image as a result, and is low-cost.
- the present invention has the following configuration.
- the polarized light illuminating device includes: a light source that emits light having a random polarization direction; a first lens plate including an aggregate of a plurality of rectangular lenses; A second lens plate composed of an aggregate of a plurality of microlenses corresponding to one to one, and an integrator optical system having a condensing lens; and a light emitted from the light source, the polarization direction of which is orthogonal and the optical axis is orthogonal.
- a polarization separation unit that separates into two substantially parallel polarized light beams; and a polarization conversion unit that aligns the polarization directions of the two polarized light beams.
- the light source image formed by the rectangular lens of the first lens plate is used as the second light source image.
- the rectangular lens is formed so that the center of its opening and the center of curvature are shifted from each other so as to be formed in a plurality of rows on the lens plate, and the minute lens of the second lens plate is formed of the rectangular lens.
- Position where the light source image is formed A plurality of rows of the microlenses, at least one of the rows having a width H in a direction perpendicular to the longitudinal direction of the row that is different from other rows, and the polarization separation.
- the unit comprises: a micro-mirror screen having a reflecting mirror provided obliquely with respect to the system optical axis; a polarization splitting surface provided in parallel with the reflecting mirror surface; and two surfaces orthogonal to the system optical axis.
- a plurality of splitters wherein the polarization separation surface includes a polarization separation film that transmits or reflects the light from the second lens plate according to the polarization direction and separates the light, and the polarization separation surface is orthogonal to the system optical axis.
- the inter-plane distance d is the same in all the micro-polarization beam splitters constituting the polarization splitter, and the distance h between the reflection mirror surface and the polarization split surface is different from the others. Characterized in that at least one optical beam splitter is included o
- the polarized light illuminating device includes: a light source that emits light having a random polarization direction; a first lens plate including an aggregate of a plurality of rectangular lenses; A second lens plate composed of an aggregate of a plurality of microlenses corresponding to the above, an integrator optical system having a condensing lens, and light emitted from the light source, wherein the light emitted from the light source has a polarization direction orthogonal to the optical axis.
- a polarization separation unit that separates the two polarized lights into parallel light, and a polarization conversion unit that aligns the polarization directions of the two polarized lights, wherein a light source image formed by a rectangular lens of the first lens plate is used as the second lens.
- the rectangular lens is formed so that the center of its opening and the center of curvature are shifted so that the rectangular lens is formed in a plurality of rows on the plate, and the minute lens of the second lens plate is formed by the rectangular lens.
- the position where the light source image is formed The plurality of rows of the microlenses has at least one row in which the width H in the direction perpendicular to the longitudinal direction of the row is different from the others, and A plurality of micro-polarization beam splitters each having a polarization splitting surface installed obliquely to the system optical axis, a surface installed parallel to the polarization splitting surface, and two surfaces orthogonal to the system optical axis.
- the polarization separation surface includes a polarization separation film that transmits or reflects the light from the second lens plate according to the polarization direction and separates the light, and the distance d between the two surfaces orthogonal to the system optical axis is At least one micro-polarization beam splitter, which is the same in all the micro-polarization beam splitters constituting the polarization splitting unit and has a distance h between the polarization splitting surface and a plane parallel thereto that is different from the others, is included. Is characterized by To.
- the polarized light illuminating device includes: a light source that emits light having a random polarization direction; a first lens plate including an aggregate of a plurality of rectangular lenses; Of multiple microlenses corresponding to An integrator optical system having a second lens plate, and a condensing lens, and a polarization separating unit that separates the light emitted from the light source into two polarized lights having orthogonal polarization directions and substantially parallel optical axes.
- a polarization conversion unit that aligns the polarization directions of the two polarized lights so that light source images formed by the rectangular lenses of the first lens plate are formed in a plurality of rows on the second lens plate.
- the rectangular lens is formed so that the center of the opening and the center of curvature are shifted from each other, and the minute lenses of the second lens plate are arranged in a plurality of rows at positions where a light source image is formed by the rectangular lens.
- at least one of the plurality of rows of the microlenses has a row in which the width H in a direction perpendicular to the longitudinal direction of the row is different from the others, and the polarization separation unit is provided with a system optical axis.
- Polarization separation installed at an angle to A plurality of micro-polarization beam splitters of the same shape having a surface installed in parallel with the polarization splitting surface and two surfaces orthogonal to the system optical axis, wherein the polarization splitting surface is It is characterized by having a polarization separation film for transmitting or reflecting the light from the two-lens plate according to the polarization direction and separating the light.
- a polarized light illuminating device includes: a light source that emits light having a random polarization direction; a first lens plate including an aggregate of a plurality of rectangular lenses; A second lens plate composed of an aggregate of a plurality of microlenses corresponding to the following, and an integrator-optical system having a condensing lens; A polarization separation unit that separates into two substantially parallel polarized light beams; and a polarization conversion unit that aligns the polarization directions of the two polarized light beams.
- the light source image formed by the rectangular lens of the first lens plate is used as the second light source image.
- the rectangular lens is formed so that the center of its opening and the center of curvature are shifted from each other so as to be formed in a plurality of rows or groups on the lens plate.
- the width H in the direction perpendicular to the longitudinal direction of the plurality of rows or groups of the microlenses is substantially the same, and the polarized light separating unit includes: a polarized light separating surface installed obliquely with respect to a system optical axis; A plurality of micro-polarized beam splitters of the same shape having a surface installed in parallel with the separation surface and two surfaces orthogonal to the system optical axis; It is characterized by comprising a polarization separation film that transmits or reflects light from the lens plate according to the polarization direction and separates the light.
- a light source that emits randomly polarized light and a modified aperture are formed in the second lens plate.
- the light source is configured by including a designed integrator optical system, a polarization separation unit that separates into two polarized lights whose polarization directions are orthogonal to each other, and a polarization conversion unit that aligns the polarization directions of these two polarized lights. It is possible to convert the random light from the camera into an arbitrary polarization direction, and at the same time, suppress the spread of the illumination light (the illumination F number can be increased).
- the polarized light illuminating device of the present invention can align all of the polarized light in the same polarization direction, a projection device using a lighting device that requires polarized light, particularly a light valve that modulates using polarized light.
- a lighting device for an image display device all of the random light from the light source can be used, and the light utilization can be greatly improved.
- the polarization splitting element can be formed according to the size of the light source image formed on the second lens plate by the first lens plate, so that the illumination F number can be increased (the divergence angle of the incident light can be reduced).
- the projection type image display device using the polarized light illumination device of the present invention can obtain a high-luminance image without changing the F-number of the projection optical system. Furthermore, when a micro lens is configured on the light valve entrance surface, the burden on the projection optical system is reduced, and the effect of the microphone aperture lens is easily obtained. You can do it.
- a projection type image display device includes a polarization light illumination device, and a modulation device including a light valve for modulating polarized light from the polarization light illumination device and displaying an image in accordance with an input signal.
- any one of the first to fourth polarized light illumination devices is used as the illumination device of the projection-type image display device using the liquid crystal light valve.
- Polarized light with a uniform surface can be supplied to the liquid crystal panel, the light use efficiency is improved, and the brightness of the projected image can be improved.
- the heat absorption by the polarizing plate is reduced, the temperature rise in the polarizing plate is suppressed.
- the cooling device can be reduced in size and noise can be reduced.
- the equipment can be made more compact and lower in cost.
- the lighting F-number can be increased, it is not necessary to design the projection lens particularly bright. As a result, it is possible to improve the light utilization rate without increasing the cost, increasing the size of the device, or decreasing the contrast.
- FIG. 1 is a diagram illustrating a schematic configuration of a polarized light illumination device according to a first embodiment of the present invention.
- FIG. 2 is a plan view showing the appearance of a first lens plate of the device shown in FIG. 1.
- FIG. 3 is a plan view showing the appearance of a second lens plate of the device shown in FIG.
- FIG. 4 shows the arrangement of the polarization splitting unit and the second lens plate of the device shown in Fig. 1.
- FIG. 4 shows the arrangement of the polarization splitting unit and the second lens plate of the device shown in Fig. 1.
- FIG. 5 is a side view showing another example of the arrangement of the polarization splitting unit and the second lens plate of the device shown in FIG.
- FIG. 6 is a side view showing still another arrangement example of the polarization splitting unit and the second lens plate of the device shown in FIG.
- FIG. 7 is a side view showing still another example of the arrangement of the polarization splitting unit and the second lens plate of the device shown in FIG.
- FIG. 8 is a diagram showing a schematic configuration of a polarized light illumination device according to the second embodiment of the present invention.
- FIG. 9 is a plan view showing the appearance of the second lens plate of the device shown in FIG. 8.
- FIG. 10 is a side view showing the arrangement of the polarization separation unit and the second lens plate of the device shown in FIG. FIG.
- FIG. 11 is a diagram illustrating a schematic configuration of a polarized light illumination device according to a third embodiment of the present invention.
- FIG. 12 is a side view showing the arrangement of the polarization splitting unit and the second lens plate of the device shown in FIG.
- FIG. 13 is a side view showing the arrangement of the polarization splitting unit of the device shown in FIG. 11 and a second lens plate having another configuration.
- FIG. 14 is a diagram showing a schematic configuration of a polarized light illumination device according to the fourth embodiment of the present invention.
- FIG. 15 is a side view showing the arrangement of the polarization splitting unit and the second lens plate of the device shown in FIG.
- FIG. 16 is a plan view showing another arrangement example of the microlenses formed on the second lens plate.
- FIG. 17 shows a schematic configuration of a projection-type image display device according to the fifth embodiment of the present invention.
- FIG. 18 is a diagram showing a schematic configuration of a projection-type image display device according to Embodiment 6 of the present invention.
- FIG. 19 is a diagram illustrating a schematic configuration of a projection-type image display device having another configuration according to the sixth embodiment of the present invention.
- FIG. 20 is a diagram showing a schematic configuration of a projection-type image display device according to Embodiment 7 of the present invention.
- FIG. 21 is a diagram illustrating a schematic configuration of a projection-type image display device according to an eighth embodiment of the present invention.
- FIG. 22 is a diagram showing a schematic configuration of a projection-type image display device according to Embodiment 9 of the present invention.
- FIG. 23 is a diagram illustrating a configuration example of a conventional polarized light illumination device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a schematic configuration example of a polarized light illumination device according to a first embodiment of the present invention.
- the polarized light illuminating device 100 of the present embodiment includes a light source unit 101, an integrator optical system 102, a polarization separation unit 103, and a polarization conversion unit along the system optical axis 150.
- the light emitted from the light source section 101 passes through the integrator optical system 102, the polarization separation section 103, and the polarization conversion section 104 to form a rectangular illumination area 1005. Leads to.
- the integrator optical system 102 includes a first lens plate 108, a second lens plate 110, and a condenser lens 118.
- the light source unit 101 includes a light source 106 and a reflector 107.
- Light with a random polarization direction emitted from the light source 106 is reflected by the reflector 106. Is reflected in one direction, and is incident on the integrator optical system 102.
- the shape of the reflecting surface of the reflector 107 may be parabolic, elliptical, or spherical depending on the design of the optical system.
- the first lens plate 108 is a composite lens body in which a plurality of minute rectangular lenses 109 as shown in FIG. 2 are arranged. Light incident on the first lens plate 108 is condensed by the individual rectangular lenses 109. The light source image formed by the rectangular lens 109 is set to be formed on the second lens plate 110.
- FIG. 3 shows the appearance of the second lens plate 110.
- the number of minute lenses 111 formed here is the same as the number of rectangular lenses 109 formed on the first lens plate 108.
- Each minute lens 1 1 1 corresponds to each rectangular lens 1 09 one-to-one.
- Each rectangular lens 109 has its center of aperture and its center of curvature so that the light source image 112 by each rectangular lens 109 is formed in a plurality of rows on the second lens plate 110. It is designed staggered.
- the minute lens 111 is arranged at a position where the light source image 112 is formed by the rectangular lens 109. Further, the aperture area and the shape of the aperture of the microlenses 111 are set according to the size of the light source image 112.
- the rows formed by the minute lenses 111 are formed in a plurality of strips on the second lens plate 110.
- the width of each row in the direction perpendicular to the longitudinal direction (the effective aperture width in the vertical direction of the microlenses 11 1 in Fig. 3) H is not the same in all rows, and rows with different widths H are mixed as shown in the figure. ing.
- FIG. 4 shows an arrangement of the polarization separation section 103 and the second lens plate 110.
- the polarization separation unit 103 is an aggregate of minute polarization beam splitters.
- Each polarizing beam splitter (prism) is a rectangular prism having a parallelogram cross section in a plane perpendicular to the reflecting mirror surface 113a or the polarization separating surface 113b.
- Reflection mirror processing is performed between the prisms 114a and 114b, between the prisms 114c and 114d, and the end surface of the prism 114f to form a reflection mirror surface. Also, by providing a polarization separation film between the prisms 114b and 114c, between the prisms 114d and 114e, and between the prisms 114e and 114f, Is composed. These prisms are arranged in rows 11 17 a, 11 b, and 11 c formed by the micro lenses 11 on the second lens plate 11. , 116 b. 116 c are arranged to face each other.
- the reflection mirror one surface 113a and the parallel polarization separation surface 113b are provided obliquely with respect to the incident light (that is, the system optical axis).
- the apertures 116a, 116b, and 116c of the prism are provided perpendicular to the incident light (that is, the system optical axis). Reflective mirror surface of prism 1 1 3a or polarization separation surface 1
- the distance h between the two opposing surfaces parallel to 13 b (in Fig. 4, the opposing sides of the opposing two sides parallel to the parallelogram reflecting mirror surface 11a or polarization separation surface 11b of the prism)
- the distance h) is not the same for all prisms, and as shown in the figure, there are prisms whose distance h between the two opposing surfaces is different from ha and hb.
- the distance d between the two opposing surfaces perpendicular to the system optical axis of each prism is the same for all prisms.
- the widths (lengths in the vertical direction in FIG. 4) of the openings 1 16 a, 116 b, and 116 c are formed by the opposing microlenses 11 1 on the second lens plate 110.
- the prism thickness is determined to match the width H of the column.
- the light emitted from the microlens array 1 17a (FIGS. 3 and 4) forming the array of the second lens plate 110 enters the aperture 116a of the polarization separation unit 103. Thereafter, the light is reflected by the reflection mirror 115a and enters the polarization splitting film 115. Here, the incident light is separated into transmitted light and reflected light depending on the polarization direction. The reflected light passes through the polarization separation section 103, and is then arranged in a strip shape on the base glass 1 19, and is set to change the polarization direction of the incident light by 90 degrees. (See Fig. 1). Here, the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the transmitted light is reflected again by the reflection mirror 115 arranged in parallel to the polarization separation film 115b, and enters the polarization conversion unit 104.
- the light beam passes through the region where the plate 2 120 is not formed, it is not particularly affected here and illuminates the illumination region 105 through the condenser lens 118.
- light emitted from the micro lens array 1 17b (FIGS. 3 and 4) forming the second lens plate 110 array passes through the aperture 1 16b of the polarization separation section 103. After the incidence, the light is reflected by the reflection mirror 115c, and then enters the polarization separation film 115d. Here, the incident light is separated into transmitted light and reflected light depending on the polarization direction. The reflected light is reflected again by the reflection mirror 115c and the polarization separation film 115d, passes through the polarization separation part 103, is arranged in a strip shape on the base glass 119, and the incident light is reflected.
- the polarization direction of the light was set to be changed by 90 degrees; Here, the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the transmitted light passes through the polarization separation film 115 e, is reflected by the reflection mirror 115 f, and enters the polarization converter 104.
- the light beam passes through an area where the IZ 2 plate 120 is not formed, it is not particularly affected here and illuminates the illumination area 105 through the condenser lens 118.
- the light emitted from the micro lens array 1 17 c (FIG. 3 and FIG. 4) forming the second lens plate 110 is applied to the aperture 1 16 c of the polarization separation section 103. After the incidence, the light enters the polarization separation film 1 15 e. Where the incident light is polarized It is further separated into transmitted light and reflected light. The reflected light is reflected again by the reflecting mirror 115f, passes through the polarization splitter 103, and is then arranged in a strip shape on the base glass 119 to change the polarization direction of the incident light by 90 degrees. It is incident on the set 1/2 plate 120. Here, the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the transmitted light passes through the polarization separation film 115 e and then enters the polarization converter 104.
- the light beam passes through an area where the IZ 2 plate 120 is not formed, it is not particularly affected here, and illuminates the illumination area 105 through the condenser lens 118.
- the polarized light illuminating device By configuring the polarized light illuminating device as described above, light having a random polarization direction emitted from the light source can be efficiently aligned in one polarization direction, and at the same time, uniform illumination can be performed by the integrator optical system. . In addition, the size of the apparatus can be realized with almost no increase in size.
- the polarization separation unit 103 is an aggregate of prisms having the same length d in the system optical axis direction, a large number of large prism materials having a predetermined thickness h are laminated and then sliced obliquely with respect to the lamination direction. It can be manufactured at any time. Further, since the entire surface can be polished and coated at one time, cost increase can be minimized.
- the aperture of the minute lens 111 of the second lens plate 110 can be formed according to the size of the light source image, the size of the second lens plate 110 can be minimized. Can be suppressed. For this reason, the parallelism of the light reaching the illumination region 105 can be increased (the illumination F number can be increased), and the range of application of various optical devices as an illumination device can be expanded.
- the integrator optical system 102, the polarization splitter 103, the polarization converter 104, and the condenser lens 118 are separated from each other. Are placed, but between each There is no need to provide a gap.
- the polarization conversion unit 104 has been described using the 1/2 plate 212, but this is not always necessary, and any means may be used as long as it can change the polarization direction of the incident light.
- the polarization direction of the light once reflected and emitted by the polarization separation unit 103 (S-polarized light on the polarization separation surface) is changed. It can be configured to act on light emitted without being reflected by the polarization separating surface (P-polarized light on the polarization splitting surface) and not on light reflected and emitted by the polarization separating portion.
- the condenser lens 118 is not necessarily a spherical lens, but may be configured by an aggregate of a Fresnel lens and a prism.
- the width H of the minute lens arrays 117b and 117c is set to be approximately 117a: 117b: 117c with respect to the width H of the minute lens array 117a forming the array of the second lens plate 110. 2: l: l, but the present invention is not limited to this.
- the distance d (see FIG. 4) between the two surfaces orthogonal to the system optical axis of the prism of the polarization splitting unit 103 is preferably substantially the same as the width H of one of the microlens arrays 117. More preferably, they match. By doing so, the light from the light source 106 is converted to polarized light without waste. be able to.
- FIG. 8 is a diagram showing a schematic configuration example of a polarized light illumination device according to a second embodiment of the present invention.
- the polarized light illuminating device 200 of the present embodiment includes a light source unit 101, an integrator optical system 201, a polarization separation unit 202, and a polarization conversion unit along the system optical axis 150.
- the light emitted from the light source unit 101 passes through the integrator optical system 201, the polarization separation unit 202, and the polarization conversion unit 203. Leads to.
- the integrator optical system 201 includes a first lens plate 108, a second lens plate 204, and a condenser lens 118.
- the light source unit 101 includes a light source 106 and a reflector 107.
- Light having a random polarization direction emitted from the light source 106 is reflected in one direction by the reflector 107 and enters the integrator optical system 201.
- the shape of the reflective surface of the reflector 107 is parabolic, elliptical, spherical However, it can be used depending on the design of the optical system.
- the first lens plate 108 is a composite lens body in which a plurality of minute rectangular lenses 109 as shown in FIG. 2 are arranged. Light incident on the first lens plate 108 is condensed by the individual rectangular lenses 109. The light source image formed by the rectangular lens 109 is set to be formed on the second lens plate 204.
- FIG. 9 shows the appearance of the second lens plate 204.
- the number of micro lenses 205 formed here is the same as the number of rectangular lenses 109 formed on the first lens plate 108.
- Each micro lens 205 corresponds one-to-one with each rectangular lens 109.
- Each rectangular lens 109 has its center of aperture and its center of curvature so that the light source image 112 by each rectangular lens 109 is formed in a plurality of rows on the second lens plate 204. It is designed staggered.
- the micro lens 205 is disposed at a position where the light source image 112 is formed by the rectangular lens 109. Further, the opening area and the shape of the opening of the minute lens 205 are set in accordance with the size of the light source image 112.
- the rows formed by the microlenses 205 are formed in a plurality of strips on the second lens plate 204 as shown in FIG.
- the width of each row in the direction perpendicular to the longitudinal direction (the effective aperture width in the vertical direction of the microlens 205 in FIG. 9) H is not the same in all rows, and rows having different widths H are mixed as shown in the figure. ing.
- FIG. 10 shows the arrangement of the polarization beam splitter 202 and the second lens plate 204.
- the polarization separation section 202 is an aggregate of minute polarization beam splitters. Each polarization beam splitter (prism) is perpendicular to the polarization separation plane 206
- the cross-sectional shape of the plane is a quadrangular prism having a parallelogram cross-sectional shape.
- a polarization splitting surface is formed by sandwiching the polarization splitting film 206 on each of the junction surfaces of the prisms 2007 a, 2007 b, 2007 c, 2007 d, and 2007 e.
- openings 209a and 209b face rows 209a and 209b of the microlenses 205 on the second lens plate 204, respectively. It is arranged as follows.
- the polarization splitting surface 206 is provided obliquely with respect to the incident light (that is, the system optical axis).
- the opening portions 208a and 208b of the prism are provided perpendicular to the incident light (that is, the system optical axis).
- the distance h between two opposing surfaces parallel to the polarization splitting surface 206 of the prism h (in FIG. 10, the distance h between two opposing sides parallel to the parallelogram polarization separating surface 206 of the prism h ) Is not the same for all prisms.
- the distance between the two opposing surfaces of the prisms 207a, 207b, and 207c is ha, and the distance between the opposing two surfaces of the prisms 207d and 207e is hb.
- the distance d between two opposing surfaces perpendicular to the system optical axis of each prism is the same for all prisms.
- the width (length in the vertical direction in FIG. 10) of the openings 208 a and 208 b is equal to the width H of the row of the opposing microlenses 205 on the second lens plate 204.
- the thickness of the prism is determined so that
- the light emitted from the micro lens array 209 a (FIG. 9 and FIG. 10) forming the array of the second lens plate 204 is incident on the aperture 208 a of the polarization separation section 202.
- the light enters the polarization separation film 210a.
- the incident light is separated into transmitted light and reflected light depending on the polarization direction.
- the transmitted light passes through the polarization separation section 202 and then enters the polarization conversion section 203.
- the light beam since the light beam passes through the region where the Z 2 plate 2 12 is not formed, the light beam illuminates the illumination region 105 via the condenser lens 118 without any particular action.
- the reflected light is reflected again by the polarization separation film 210b arranged in parallel with the polarization separation film 210a. I'm sick.
- the reflected light passes through the polarization separation section 202 and is then arranged in a strip shape on the base glass 211 so that the polarization direction of the incident light is changed by 90 degrees; Incident.
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the light emitted from the micro lens array 209b (FIG. 9, FIG. 10) forming the array of the second lens plate 204 is transmitted to the aperture 208b of the polarization separation section 202. After the incidence, the light enters the polarization separation film 210c. Here, the incident light is separated into transmitted light and reflected light depending on the polarization direction. The transmitted light passes through the polarization separation section 202 in the same manner as described above, and then enters the polarization conversion section 203. At this time, since the light beam passes through a region where the Z 2 plate 2 12 is not formed, the light beam illuminates the illumination region 105 via the condenser lens 118 without any particular action.
- the reflected light is reflected by the polarization separation films 210d arranged in parallel with the polarization separation films 210c, and then reflected again by the polarization separation films 210c and 210d, / 2 plate 2 1 2
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the polarized light illuminator By configuring the polarized light illuminator as described above, it is possible to efficiently align light with random polarization directions emitted from the light source 106 into one polarization direction, and at the same time, achieve uniform illumination with the integrator optical system. Becomes possible. However, the size of the device can be realized with almost no increase in size.
- the polarization separation unit 202 is an assembly of prisms having the same length d in the system optical axis direction, a large number of large prism materials having a predetermined thickness h are laminated and then sliced obliquely to the lamination direction. It can be manufactured at any time. Further, since the entire surface can be polished and coated at one time, cost increase can be minimized.
- the aperture of the minute lens 205 of the second lens plate 204 can be formed according to the size of the light source image, the size of the second lens plate 204 can be reduced. Can be minimized. For this reason, the parallelism of light reaching the illumination area 105 can be increased (the illumination F number can be increased), and the range of application of various optical devices as an illumination device can be expanded.
- the integrator optical system 201, the polarization separation unit 202, the polarization conversion unit 203, and the condenser lens 118 are separately arranged. There is no need to provide an interval between them, and they can be configured as a single unit.
- the polarization conversion unit 203 has been described using the IZ2 plate 212, but this is not always necessary, and any means may be used as long as the polarization direction of incident light can be changed.
- the polarization direction of the light once reflected and emitted by the polarization separation unit 202 (S-polarized light on the polarization separation surface) is changed. It can be configured to act on light emitted without being reflected by the polarization separating surface (P-polarized light on the polarization splitting surface) and not on light reflected and emitted by the polarization separating portion.
- the thick prisms 207a, 207b, and 207c are laminated with n thin prisms 207d and 207e forming materials (photorefractive materials), the material to be used can be obtained. Since it is possible to use only one kind of thickness, it is advantageous in processing and cost reduction is possible. At this time, the joint surface is Needless to say, it is necessary to provide a joint surface that does not give a mechanical effect.
- the condensing lens 118 is not necessarily a spherical lens, but may be constituted by an assembly of Fresnel lenses and prisms.
- the surface 210b is a polarization separation surface, but this may be a reflection mirror alone.
- FIG. 11 is a diagram showing a schematic configuration example of a third embodiment of the polarized light illuminating device of the present invention.
- the polarized light illumination device 300 of the present embodiment includes a light source unit 101, an integrator optical system 201, a polarization separation unit 301, and a polarization conversion unit 200 along the system optical axis 150.
- the light emitted from the light source unit 101 passes through the integrator optical system 201, the polarization separation unit 301, and the polarization conversion unit 203, and reaches the rectangular illumination area 105.
- the integrator optical system 201 includes a first lens plate 108, a second lens plate 204, and a condenser lens 118.
- the light source unit 101 includes a light source 106 and a reflector 107.
- Light having a random polarization direction emitted from the light source 106 is reflected in one direction by the reflector 107 and is incident on the integrator optical system 201.
- the shape of the reflecting surface of the reflector 107 may be parabolic, elliptical, or spherical depending on the design of the optical system.
- the first lens plate 108 is a composite lens body in which a plurality of minute rectangular lenses 109 as shown in FIG. 2 are arranged. Light incident on the first lens plate 108 is condensed by the individual rectangular lenses 109. The light source image formed by the rectangular lens 109 is set to be formed on the second lens plate 204. FIG. 9 shows the appearance of the second lens plate 204.
- the number of the minute lenses 205 formed here is the same as the number of the rectangular lenses 109 formed on the first lens plate 108. Each micro lens 205 corresponds to each rectangular lens 109 one-to-one.
- Each rectangular lens 109 is designed so that its opening center and curvature center are shifted so that the light source images 112 by each rectangular lens 109 are formed in a plurality of rows on the second lens plate 204. ing.
- the minute lens 205 is arranged at a position where the light source image 112 is formed by the rectangular lens 109. Further, the opening area and the shape of the opening of the minute lens 205 are set in accordance with the size of the light source image 112.
- the rows formed by the micro lenses 205 are formed in a plurality of strips on the second lens plate 204 as shown in FIG.
- the width of each row in the direction perpendicular to the longitudinal direction (the effective aperture width in the vertical direction of the micro lens 205 in FIG. 9) H is not the same in all rows, and rows having different widths H are mixed as shown in the figure. .
- FIG. 12 shows an arrangement diagram of the polarization separation unit 301 and the second lens plate 204.
- the polarization separation unit 301 is an aggregate of minute polarization beam splitters having the same shape.
- the polarizing beam splitter (prism) is a rectangular prism having a parallelogram cross-sectional shape in a plane perpendicular to the polarization splitting surface 302.
- Each of the joining surfaces of the prisms 303a, 303b, 303c, 303d, 303e, 303f, and 303g has a polarization splitting surface with a polarization splitting film 302 interposed therebetween.
- These prisms are arranged such that the openings 304a and 304b, 304c face the rows 209a, 209b of the minute lenses 205 on the second lens plate 204.
- openings 304a, 30 The widths of 4b and 304c (length in the vertical direction in FIG. 12) match the width H of the microlens array 209b having the smallest width H on the second lens plate 204. As such, the thickness of the prism is determined.
- the polarization separation plane 302 is provided obliquely with respect to the incident light (that is, the system optical axis).
- the apertures 304a, 304b, 304c of the prism are provided perpendicular to the incident light (that is, the system optical axis).
- the light emitted from the microlens array 209a forming the array on the second lens plate 204 enters the polarization separation unit 301. Since the width H of the microlens array 209a is approximately twice the width of the prism apertures 304a, 304b, 304c, it is emitted from the microlens array 209a. The split light enters the opening 304 a and the opening 304 b and enters.
- the lower half light emitted from the microlens array 209a enters the aperture 304a and then enters the polarization separation film 306a.
- the incident light is separated into transmitted light and reflected light depending on the polarization direction.
- the transmitted light passes through the polarization separation section 301 and then enters the polarization conversion section 203.
- the light beam passes through the area where the 1/2 plate 2 12 is not formed, it illuminates the illumination area 105 via the condenser lens 118 without any particular action.
- the reflected light is reflected again by the polarization separation films 300 b arranged in parallel with the polarization separation films 306 a and then reflected again by the polarization separation films 306 a and 306 b.
- the polarizing beam splitter 301 After passing through the polarizing beam splitter 301, it is incident on a ⁇ ⁇ 2 plate 2 12 arranged in a strip shape on the base glass 2 11 1 and set to change the polarization direction of the incident light by 90 degrees. .
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the upper half of the light emitted from the microlens array 209a enters the opening 304b, and is separated into transmitted light and reflected light by the polarization separating film 306b depending on the polarization direction.
- the transmitted light passes through the polarization separation section 301 and changes polarization.
- the switching section 203 To the switching section 203.
- the light beam since the light beam passes through a region where the ⁇ / 2 plate 2 12 is not formed, the light beam illuminates the illumination region 105 via the condenser lens 118 without any particular action.
- the reflected light is reflected again by the polarization separation film 300 c arranged in parallel with the polarization separation film 306 b and then reflected again by the polarization separation film 306 b.
- the light After passing through the polarization separation section 301, the light is incident on a 1/2 plate 2122 arranged in a strip shape on the base glass 211 and set so as to change the polarization direction of the incident light by 90 degrees.
- the light whose polarization direction has been converted here illuminates the illumination area 105 through the condenser lens 118.
- the light emitted from the microlens array 209b on the second lens plate 204 enters the polarization separation section 301.
- the width H of the microlens array 2 09 b is almost the same as the width of the prism openings 304 a, 304 b, and 304 c. 4 All incident on c.
- the light emitted from the microlens array 209b enters the opening 304c and then enters the polarization separation film 306d.
- the incident light is separated into transmitted light and reflected light depending on the polarization direction.
- the transmitted light passes through the polarization separation section 301 and then enters the polarization conversion section 203. At this time, since the light beam passes through the region where the ⁇ / 2 plate 2 12 is not formed, the light beam illuminates the illumination region 105 via the condenser lens 118 without any particular action.
- the reflected light is reflected again by the polarization separation film 300 e arranged in parallel with the polarization separation film 306 d, and then reflected again by the polarization separation films 306 d and 306 e to separate the polarized light.
- the light After passing through the part 301, the light is incident on a Z2 plate 211 arranged in a strip shape on the base glass 211 and set so as to change the polarization direction of the incident light by 90 degrees.
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the polarized light illumination device By constructing the polarized light illumination device as described above, light is emitted from the light source 106 Light with a random polarization direction can be efficiently aligned in one polarization direction, and at the same time, uniform illumination can be achieved with the integrator optical system 201. In addition, the size of the apparatus can be realized with almost no increase in size. Since the polarization splitters 301 are all aggregates of the same prism, they can be mass-produced by laminating a plurality of large prism materials having a predetermined thickness h and then slicing them obliquely in the laminating direction. Further, since the entire surface can be polished and coated at one time, cost increase can be minimized.
- the aperture of the minute lens 205 of the second lens plate 204 can be formed according to the size of the light source image, the size of the second lens plate 204 can be minimized. Can be suppressed. For this reason, the parallelism of the light reaching the illumination region 105 can be increased (the illumination F number can be increased), and the range of application of various optical devices as an illumination device can be expanded.
- the integrator optical system 201, the polarization separation unit 301, the polarization conversion unit 203, and the condenser lens 118 are respectively provided. Although they are arranged separately, there is no need to provide an interval between them, and they can be integrated.
- the polarization conversion section 203 was described using the ⁇ / 2 plate 212, but this is not necessarily required, and any means may be used as long as it can change the polarization direction of the incident light.
- the polarization direction of the light once reflected and emitted by the polarization separation unit 301 (S-polarized light on the polarization separation surface) is changed in order to align the polarization directions. It is also possible to adopt a configuration that acts on light emitted without being reflected by the polarization splitting section ( ⁇ polarized light on the polarization splitting surface) and does not act on light reflected and emitted by the polarization splitting section. Further, the light reflected and emitted by the polarization splitting section and the light emitted without being reflected are each given a different action so that both polarization directions are aligned. That's a monkey.
- the parallelogram prisms constituting the polarization separation section 301 are all of the same shape, cost reduction can be realized in terms of materials and processing.
- the condensing lens 118 is not necessarily a spherical lens as in the above-described embodiment, but may be a Fresnel lens or an aggregate of prisms.
- the parallel lens forming the polarization beam splitter is used.
- the quadrangular prism has a width H of the effective aperture of the narrowest lens row (here, 209 b) among the rows of micro lenses 205 on the second lens plate 204.
- the size is set so that the widths of the apertures 304a, 304b, and 304c of the prism match. However, the width of the openings 304a, 304b, 304c does not need to be equal to the width H of the microlens array.
- the width H may be a value obtained by dividing the width H by a natural number n. It can be similarly configured. This is because even if the light emitted from the microlens array 209a on the second lens plate 204 in the above description is split into two and enters the two prisms, there is no problem in the polarization separation unit. This is apparent from the fact that the light was polarized and separated.
- the width H of the lens array formed by the microlenses 205 on the second lens plate 204 is approximately equal to and approximately twice as large as the opening of the polarizing beam splitter. It was from.
- the present invention is not limited to this, and as shown in Fig.
- the surface 306 c is a polarization splitting surface, but this may be one surface of a reflection mirror. (Embodiment 4)
- FIG. 14 is a diagram showing a schematic configuration example of a polarized light illumination device according to a fourth embodiment of the present invention.
- the polarized light illumination device 400 according to the present embodiment has a system optical axis 15
- a light source section 101 an integrator optical system 201, a polarization separation section 401, and a polarization conversion section 203 are provided, and the light emitted from the light source section 101 is integrated.
- the light reaches the rectangular illumination area 105 through the Greater optical system 201, the polarization separation unit 401, and the polarization conversion unit 203.
- Reference numeral 201 denotes a first lens plate 108, a second lens plate 204, and a condenser lens 118.
- the light source unit 101 includes a light source 106 and a reflector 107. Light having a random polarization direction emitted from the light source 106 is reflected in one direction by the reflector 107 and enters the integrator optical system 201.
- the shape of the reflecting surface of the reflector 107 may be parabolic, elliptical, or spherical depending on the design of the optical system.
- the first lens plate 108 is a composite lens body in which a plurality of minute rectangular lenses 109 as shown in FIG. 2 are arranged. Light incident on the first lens plate 108 is condensed by the individual rectangular lenses 109. The light source image formed by the rectangular lens 109 is set to be formed on the second lens plate 204.
- FIG. 9 shows the appearance of the second lens plate 204.
- the number of micro lenses 205 formed here is the same as the number of rectangular lenses 109 formed on the first lens plate 108.
- Each micro lens 205 corresponds one-to-one with each rectangular lens 109.
- the light source image 1 1 2 by each rectangular lens 109 is
- Each rectangular lens 109 is designed so that its opening center and curvature center are shifted from each other so as to be formed in a plurality of rows on the lens plate 204.
- the micro lens 205 is disposed at a position where the light source image 112 is formed by the rectangular lens 109. Further, the opening area and the shape of the opening of the minute lens 205 are set in accordance with the size of the light source image 112.
- the rows formed by the micro lenses 205 are formed in a plurality of strips on the second lens plate 204 as shown in FIG.
- the width of each row in the direction perpendicular to the longitudinal direction (the effective aperture width of the microlens 205 in the vertical direction in FIG. 9) H is not the same in all the rows.
- the micro lens array 209 b and the micro lens array 209 c having the small width H are formed adjacent to each other as shown in the figure, and form a group of micro lenses as a whole.
- the width H of the microlens group in the direction perpendicular to the longitudinal direction (the total opening width in the vertical direction of the microlens group in FIG. 9) H is formed to be substantially the same as the width H of the microlens array 209a.
- the microlenses 205 on the second lens plate 204 of the present embodiment are arranged so as to form a plurality of rows or groups, and furthermore, are arranged in a direction perpendicular to the longitudinal direction of the rows or groups.
- the widths are all formed to be substantially the same.
- FIG. 15 shows an arrangement diagram of the polarization separation section 401 and the second lens plate 204.
- the polarization separation section 401 is an aggregate of minute polarization beam splitters having the same shape.
- the polarizing beam splitter (prism) is a rectangular prism having a parallelogram cross-sectional shape in a plane perpendicular to the polarization splitting plane 402.
- Each of the joining surfaces of the prisms 403a, 403b, 403c, 403d is provided with a polarization separation surface with the polarization separation film 402 interposed therebetween.
- These prisms are
- the apertures 404a, 404b face the rows or groups 209a, 209b, 209c formed by the microlenses 205 on the second lens plate 204. It is arranged to be.
- the width of the openings 404 a and 404 b (the length in the vertical direction in FIG. 15) is the smallest lens row 200 having the largest width H on the second lens plate 204.
- the thickness of the prism is determined to match the width H of 9a.
- the polarization splitting surface 402 is provided obliquely with respect to the incident light (that is, the system optical axis).
- the openings 404a and 404b of the prism are provided perpendicular to the incident light (that is, the system optical axis).
- the light emitted from the microlens array 209a forming the array on the second lens plate 204 enters the aperture 404a of the polarization separation section 401.
- the incident light is separated into transmitted light and reflected light by the polarization separation film 210a according to the polarization direction.
- the transmitted light passes through the polarization separation section 401 and then enters the polarization conversion section 203.
- the illumination area 105 is illuminated via the condenser lens 118 without any particular action.
- the reflected light is reflected again by the polarization separation film 210b arranged in parallel with the polarization separation film 210a, and after passing through the polarization separation part 401, is strip-shaped on the base glass 211. And is set to convert the polarization direction of the incident light by 90 degrees; Here, the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the light enters a position shifted downward from the center of 04 b.
- the incident light is separated by the polarization separation film 210c into transmitted light and reflected light depending on the polarization direction.
- the transmitted light passes through the polarization separation unit 401 in the same manner as described above, and then enters the polarization conversion unit 203.
- the light beam is shaped as ⁇ ⁇ 2 plate 2 1 2 Since the light passes through an area that is not formed, the illumination area 105 is illuminated via the condenser lens 118 without any particular effect.
- the reflected light is reflected by the polarization separation film 210d arranged in parallel with the polarization separation film 210c, and then enters the ⁇ 2 plate 211.
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the light emitted from the microlens array 209c that forms a part of the microlens group on the second lens plate 204 is incident on a position shifted upward from the center of 404b (a position different from the position where the light from the minute lens array 209b is incident).
- the incident light is separated by the polarization separation film 210c into transmitted light and reflected light depending on the polarization direction.
- the transmitted light exits the polarization separation section 401 in the same manner as described above, and then enters the polarization conversion section 203.
- the illumination area 105 is illuminated through the condenser lens 118 without any particular action.
- the reflected light is reflected by the polarization separation film 210d arranged in parallel with the polarization separation film 210c, and then enters the ⁇ 2 plate 212.
- the light whose polarization direction has been changed illuminates the illumination area 105 through the condenser lens 118.
- the polarized light illuminating device By configuring the polarized light illuminating device as described above, light having a random polarization direction emitted from the light source 106 can be efficiently aligned in one polarization direction, and at the same time, the integrator optical system 201 And uniform illumination becomes possible.
- the size of the apparatus can be realized with almost no increase in size. Since the polarization splitting sections 401 are all an aggregate of the same prism, a large number of large prism materials having a predetermined thickness h can be laminated and then sliced obliquely to the laminating direction to produce a large amount. Further, since the entire surface can be polished and coated at one time, cost increase can be minimized.
- the aperture of the minute lens 205 of the second lens plate 204 can be formed according to the size of the light source image, the size of the second lens plate 204 can be minimized. Can be suppressed. For this reason, the parallelism of the light reaching the illumination region 105 can be increased (the illumination F number can be increased), and the range of application of various optical devices as an illumination device can be expanded.
- the integrator optical system 201, the polarization separation unit 401, the polarization conversion unit 203, and the condenser lens 118 are respectively provided. Although they are arranged separately, there is no need to provide an interval between them, and they can be integrated.
- the polarization conversion section 203 was described using the IZ2 plate 211, but this is not necessarily required, and any means may be used as long as it can change the polarization direction of the incident light. Further, in the above embodiment, in order to align the polarization directions, the polarization direction of the light once reflected and emitted by the polarization separation unit 401 (S-polarized light on the polarization separation surface) is changed. It is also possible to adopt a configuration that acts on light emitted without being reflected by the polarization splitting section (P-polarized light on the polarization splitting surface) and does not act on light reflected and emitted by the polarization splitting section. Furthermore, it is also possible to adopt a configuration in which light reflected and emitted by the polarization splitting section and light emitted without being reflected are subjected to different actions to align the polarization directions of both.
- the parallelogram prisms constituting the polarization splitting section 401 are all of the same shape, cost reduction can be realized in terms of materials and processing.
- the condenser lens 118 is not necessarily a spherical lens as in the above-described embodiment, but may be constituted by an assembly of Fresnel lenses and prisms.
- the micro lens array 209 b and the micro lens array 209 c Were formed adjacent to each other to form a microlens group.
- the width of the micro lens group is set to be equal to the width H of the micro lens array 209a.
- the micro lens group does not need to have a configuration that can be clearly distinguished into a plurality of micro lens rows as shown in FIG.
- a micro lens group 209 d as shown in FIG. 16A or a micro lens group as shown in FIG. 209e may be formed.
- the width H of the microlens groups 209d and 209e in the vertical direction on the paper surface is formed to be the same as the width H of another microlens array or microlens group (for example, the microlens array 209a).
- the second lens plate 204 shown in FIG. 16C can be used instead of the second lens plate 204 shown in FIG.
- the microlenses 205 of the second lens plate 204 are arranged to form six microlens rows (or groups) 230a, 230b, 230c, 230d, 230e, 230f. .
- the effective aperture widths H of these microlens arrays (or groups) in the upper and lower directions on the paper are all the same. Note that, in FIG. 16C, the light source image by the first lens plate is omitted to simplify the drawing. As shown in FIG.
- microlens rows or microlens groups on the plate must match the number of rectangular lenses arrayed on the first lens plate (for example, seven rows in Fig. 2) There is no.
- FIGS. 16 (A), (B) and (C) conceptually show the arrangement of the microlenses 205.
- the number of microlenses depends on the number of rectangular lenses in the first lens plate. Needless to say, they need to be matched.
- the surfaces 210b and 210d are polarization separation surfaces. However, these surfaces may be one surface of a reflection mirror.
- the optical axis 101a of the light source unit 101 and the first lens plate 108 constitute a polarization separation unit with respect to the system optical axis 150. It is desirable that the prism be placed at a position shifted by about half of the distance d between two surfaces orthogonal to the system optical axis of the prism. By doing so, light from the light source 106 can be converted to polarized light without waste. At this time, if the above-mentioned shift amount with respect to the system optical axis 150 cannot be ensured due to spatial restrictions or the like, the axis of the rectangular lens 109 on the first lens plate 110 is shifted by shifting the axis. Can compensate for the amount of shift, etc.
- FIG. 17 shows an example in which the device of the first embodiment is applied to a projection type image display device.
- the projection-type image display device 500 shown in FIG. 17 has a light source 101 that emits randomly polarized light in one direction.
- the random polarized light emitted from the light source 101 is The light is separated into two kinds of polarized light by the integrator optical system 102 and the polarization separation unit 103, and one of the separated polarized lights is polarized by the polarization conversion unit 104; The direction is changed so that it is aligned with one polarization direction.
- red light is transmitted through the red transmission dichroic mirror 501, and blue and green light are reflected.
- the red light is reflected by the reflection mirror 502, and the first liquid crystal light valve 500 Reach three.
- the green light is reflected by the green reflecting dike port 504, and reaches the second liquid crystal light valve 505.
- the reflecting mirror 507 and the reflecting mirror are formed into a relay lens system including the entrance lens 506, the relay lens 508, and the exit lens 510.
- the light is supplied to the third liquid crystal light valve 511 by the light guiding means 512 constituted by adding 509.
- the first, second, and third liquid crystal light valves 503, 505, and 511 modulate color light, respectively.
- the color light modulated according to the video signal corresponding to each color enters the dichroic prism 5 13 (color combining device).
- the dichroic prism 5 13 has a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film crossed in a cross shape, and synthesizes respective modulated light beams.
- the luminous flux synthesized here passes through a projection lens 514 (projection optical system) to form an image on a screen 515 not shown.
- the projection type image display device 500 configured as described above, a type of liquid crystal panel that modulates one type of polarized light is used. Therefore, when the conventional random polarized light is guided to this type of liquid crystal light valve, half of the randomly polarized light is absorbed by the polarizer and converted into heat, so that the light utilization factor is low and the polarizer is low. There was a problem that a large and noisy cooling device was needed to suppress the heat generation of the air conditioner. However, the projection-type image display device 500 of this example uses the polarized light illuminating device of the first embodiment that can supply polarized light having a uniform polarization direction, so that such a problem can be largely solved.
- the minute lens 111 of the second lens plate 110 is approximately optimized for the light source image 112 on the second lens plate 110, and its aperture area and shape are Can be minimized, so that the apparent area of the second lens plate viewed through the polarization conversion section can be made small.
- the F-number of the projection lens is from the apparent size of the second lens plate to the LCD panel to the second lens plate. If the apparent size of the second lens plate can be reduced, the F-number will be reduced, that is, there is no need to brighten the projection lens.
- the projection lens 5 14 is a projection lens used in a conventional apparatus that does not perform polarization conversion or a lens close to the projection lens, it is possible to sufficiently realize high brightness of a projected image. I can do it. This is advantageous for improving the image quality, especially when the light valve uses liquid crystal, which causes a decrease in contrast when the incident angle is wide.
- the light transmitted through the first, second, and third liquid crystal light valves 503, 505, and 511 emits one light in the dichroic prism 513, which is a color synthesizing device.
- the light was guided on an axis and enlarged and projected by a single projection lens 514, which is a projection optical system.
- the present invention is not particularly limited to this.
- a projection lens for each color light so that the output light of the first, second, and third liquid crystal light valves 503, 505, and 511 for each color light can be enlarged and projected without using a color synthesis device. May be provided.
- the light valve is a transmissive liquid crystal.
- the present invention is not limited to this, and it is obvious that the same effect can be obtained if polarized light is applied.
- FIG. 18 shows another example in which the device of the first embodiment is applied to a projection-type image display device.
- the projection-type image display device 600 shown in FIG. 18 has a light source unit 101 that emits randomly polarized light in one direction, and the random polarized light emitted from the light source unit 101 is The polarized light is separated into two kinds of polarized light by the integrator optical system 102 and the polarization separation unit 103, and one of the separated polarized lights is polarized by the polarization conversion unit 104; The direction is changed so that it is aligned with one polarization direction.
- the light beam emitted from such a polarized light illuminating device 100 enters the liquid crystal light valve 600.
- the liquid crystal light valve 601 has a number of pixels 602a, 602b, 602c that can be driven independently according to an input signal for each color light.
- a color filter 603 a, 603 b, 603 c that transmits only the color light corresponding to the drive signal is provided.
- the liquid crystal light valve 600 modulates by changing the polarization direction of incident light, as in the case of the fifth embodiment.
- the incident side of the liquid crystal light valve 6001 is provided with an incident side polarizer 604 that transmits only light of an arbitrary polarization direction, and the light exiting side of the light transmitted through the liquid crystal light valve 61 is provided.
- An emission-side polarizing plate 605 is provided to transmit light in a polarization direction from a pixel to be projected on a screen and to shield light in a polarization direction perpendicular to the polarization direction.
- the light transmitted therethrough passes through a projection lens 606 (projection optical system) to form an image on a screen 515 (not shown).
- the projection-type image display device 600 of this example uses the polarized light illuminating device of the first embodiment, which can supply polarized light having a uniform polarization direction, so that such a problem can be largely solved.
- the minute lens 111 of the second lens plate 110 is approximately optimized to the light source image 112 on the second lens plate 110 to minimize its aperture area and shape.
- the apparent area of the second lens plate viewed through the polarization converter can be reduced.
- the F-number of the projection lens is determined by the apparent size of the second lens plate and the distance from the liquid crystal panel to the second lens plate, and the apparent size of the second lens plate can be reduced. If this is the case, there is no need to make the F-number smaller, that is, make the projection lens brighter.
- the projection lens 606 is a projection lens used in a conventional apparatus that does not perform polarization conversion or a lens close to the projection lens, it is possible to sufficiently realize high brightness of a projection image. Can be done. This is advantageous for improving the image quality, especially when the light valve is a liquid crystal application that causes a decrease in contrast when the incident angle is wide.
- the color is determined by the color filters 603 a, 603 b, and 603 c, but as shown in FIG. 19, the dichroic mirrors 607, 608, and By performing color separation with a reflection mirror 609 and providing one microlens 610 for every three pixels, it can be applied to a single-panel projection image display device without using a color filter. Needless to say.
- FIG. 19 members having the same functions as those in FIG. 18 are denoted by the same reference numerals, and detailed description will be omitted.
- FIG. 20 shows an example in which the device of the second embodiment is applied to a projection type image display device.
- the projection-type image display device 700 shown in FIG. 20 has a light source unit 101 that emits randomly polarized light in one direction, and the random polarized light emitted from the light source unit 101 is The polarized light is separated into two types of polarized light by the integrator optical system 201 and the polarization separating unit 202, and one of the separated polarized lights is polarized by the IZ 2 plate 2 12 of the polarization converting unit 203. Is converted and aligned in one polarization direction.
- red light is transmitted through a red transmission dichroic mirror 501, and blue and green light are reflected.
- the red light is reflected by the reflection mirror 502, and the first liquid crystal light valve 50 Reach three.
- the green light is reflected by the green reflecting dike port mirror 504 and reaches the second liquid crystal light valve 505.
- the reflecting mirror 507 is reflected by the relay lens system consisting of the entrance lens 506, the relay lens 508, and the exit lens 510.
- the light is guided to the third liquid crystal light valve 511 by the light guiding means 512 configured by adding a mirror 5109.
- the first, second, and third liquid crystal light valves 503, 505, and 511 modulate color light, respectively.
- the color light modulated according to the video signal corresponding to each color enters the dichroic prism 5 13 (color combining device).
- the dichroic prism 5 13 has a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film crossed in a cross shape, and synthesizes respective modulated light beams.
- the luminous flux synthesized here passes through a projection lens 514 (projection optical system) to form an image on a screen 515 not shown.
- the projection type image display device 700 configured as described above, a type of liquid crystal panel that modulates one type of polarized light is used. Therefore, when the conventional random polarized light is guided to this type of liquid crystal light valve, half of the randomly polarized light is absorbed by the polarizer and converted into heat, so that the light utilization factor is low and the polarizer is low. There was a problem that a large and noisy cooling device was needed to suppress the heat generation of the air conditioner.
- the projection-type image display device 700 of the present example uses the polarized light illuminating device of the second embodiment, which can supply polarized light having a uniform polarization direction, so that such a problem can be largely solved.
- the minute lens 205 of the second lens plate 204 is approximately optimized for the light source image 112 on the second lens plate 204, and its aperture area and shape are Can be minimized, so that the apparent area of the second lens plate viewed through the polarization conversion section can be made small.
- the F-number of the projection lens is from the apparent size of the second lens plate to the LCD panel to the second lens plate. If the apparent size of the second lens plate can be reduced, the F-number will be reduced, that is, there is no need to brighten the projection lens.
- the projection lens 5 14 is a projection lens used in a conventional apparatus that does not perform polarization conversion or a lens close to the projection lens, it is possible to sufficiently realize high brightness of a projected image. I can do it. This is advantageous for improving the image quality, especially when the light valve uses liquid crystal, which causes a decrease in contrast when the incident angle is wide.
- the light transmitted through the first, second, and third liquid crystal light valves 503, 505, and 511 is a dichroic prism that is a color synthesizing device.
- the light was guided on one optical axis by 5 13 and enlarged and projected by one projection lens 5 14 which is a projection optical system.
- the present invention is not particularly limited to this.
- a projection lens is provided for each color light so that the light emitted from the first, second, and third liquid crystal light valves 503, 505, and 511 for each color light can be enlarged and projected without using a color synthesis device. It is also possible to adopt a configuration provided.
- the light valve is a transmissive liquid crystal.
- the present invention is not limited to this, and it is obvious that the same effect can be obtained if polarized light is applied.
- a light valve is provided for each color light using a color separation optical system as shown in FIG.
- a single-plate type FIGS. 18 and 19
- Embodiment 6 for performing color display with one light valve can also be used.
- FIG. 21 shows an example in which the device of the third embodiment is applied to a projection type image display device.
- the projection type image display device 800 shown in FIG. 21 has a light source unit 101 that emits randomly polarized light in one direction, and the random polarized light emitted from the light source unit 101 is The light is separated into two types of polarized light by the integrator optical system 201 and the polarization separation unit 301, and one of the separated polarized lights is polarized by the polarization conversion unit 203; The direction is changed so that it is aligned with one polarization direction.
- red light is transmitted through the red transmission dichroic mirror 501, and blue and green light are reflected.
- the red light is reflected by the reflection mirror 502, and the first liquid crystal light valve 50
- the green light is reflected by the green reflecting dike port mirror 504 and reaches the second liquid crystal light valve 505.
- the relay lens system consisting of the entrance lens 506, the relay lens 508, and the exit lens 510.
- the light is guided to the third liquid crystal light valve 511 by the light guide means 512 configured by adding a mirror 509.o
- the first, second, and third liquid crystal light valves 503, 505, 5 1 and 1 respectively modulate the color light.
- the color light modulated according to the video signal corresponding to each color enters the dichroic prism 5 13 (color combining device).
- the dichroic prism 5 13 has a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film crossed in a cross shape, and synthesizes respective modulated light beams.
- the luminous flux synthesized here passes through a projection lens 514 (projection optical system) to form an image on a screen 515 not shown.
- the projection type image display device 800 configured as described above, a type of liquid crystal panel that modulates one type of polarized light is used. Therefore, when a conventional random polarized light is guided to this type of liquid crystal light valve, a random polarized light is generated. The problem is that half of the light is absorbed by the polarizer and converted into heat, which results in low light utilization, and a large and noisy cooling device is required to suppress the heat generated by the polarizer. There was. However, since the projection type image display device 800 of this example uses the polarized light illuminating device of the third embodiment which can supply polarized light having a uniform polarization direction, such a problem can be largely solved.
- the minute lens 205 of the second lens plate 204 is approximately optimized for the light source image 112 on the second lens plate 204, and its aperture area and shape are Can be minimized, so that the apparent area of the second lens plate viewed through the polarization conversion section can be made small.
- the F-number of the projection lens is determined by the apparent size of the second lens plate and the distance from the LCD panel to the second lens plate. If the apparent size of the second lens plate can be reduced, the F-number will be reduced. That is, it is not necessary to brighten the projection lens.
- the projection lens 5 14 is combined with a projection lens used in a conventional apparatus that does not perform polarization conversion or a lens close to the projection lens, it is possible to sufficiently realize high brightness of a projected image. You can do it. This is advantageous for improving the image quality, especially when the light valve uses liquid crystal, which causes a decrease in contrast when the incident angle is wide.
- the light transmitted through the first, second, and third liquid crystal light valves 503, 505, and 511 is a dichroic prism that is a color synthesizing device.
- the light was guided on one optical axis by 5 13 and enlarged and projected by one projection lens 5 14 which is a projection optical system.
- the present invention is not particularly limited to this.
- a projection lens is provided for each color light so that the light emitted from the first, second, and third liquid crystal light valves 503, 505, and 511 for each color light can be enlarged and projected without using a color synthesis device. It is also possible to adopt a configuration provided.
- the light valve is a transmissive liquid crystal.
- a light valve is provided for each color light using a color separation optical system as shown in FIG.
- the single-plate type shown in Embodiment 6 in which a single light valve performs color display can also be used.
- FIG. 22 shows an example in which the device of the fourth embodiment is applied to a projection type image display device.
- the projection-type image display device 900 shown in FIG. 22 has a light source 101 that emits randomly polarized light in one direction, and the random polarized light emitted from the light source 101 is The light is separated into two types of polarized light by the integrator optical system 201 and the polarization separating unit 401, and one of the separated polarized lights is polarized by the polarization conversion unit 203; the IZ2 plate 211. The direction is changed so that it is aligned with one polarization direction.
- red light is transmitted through a red transmission dichroic mirror 501, and blue and green light are reflected.
- the red light is reflected by the reflection mirror 502, and the first liquid crystal light valve 50
- the green light is reflected by the green reflecting dike port mirror 504 and reaches the second liquid crystal light valve 505.
- the reflecting mirror 507 is reflected by the relay lens system consisting of the entrance lens 506, the relay lens 508, and the exit lens 510.
- the light is guided to the third liquid crystal light valve 511 by the light guiding means 512 configured by adding the mirror 509. o
- the first, second, and third liquid crystal light valves 503, 505, and 511 respectively modulate color light.
- the color light modulated according to the video signal corresponding to each color enters the dichroic prism 5 13 (color combining device).
- the dichroic prism 5 13 has a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film crossed in a cross shape, and synthesizes respective modulated light beams.
- the luminous flux synthesized here passes through a projection lens 514 (projection optical system) to form an image on a screen 515 not shown.
- the projection-type image display device 900 thus configured uses a liquid crystal panel that modulates one type of polarized light. Therefore, when a conventional random polarized light is guided to this type of liquid crystal light valve, half of the randomly polarized light is absorbed by the polarizer and converted into heat, so that the light utilization is low and the polarizer is low. There was a problem that a large and noisy cooling device was needed to suppress the heat generation of the air conditioner.
- the projection-type image display device 900 of this example uses the polarized light illuminating device according to the fourth embodiment, which can supply polarized light having a uniform polarization direction, so that such a problem can be largely solved.
- the minute lens 205 of the second lens plate 204 is approximately optimized for the light source image 112 on the second lens plate 204, and its aperture area and shape are Can be minimized, so that the apparent area of the second lens plate viewed through the polarization conversion section can be made small.
- the F-number of the projection lens is determined by the apparent size of the second lens plate and the distance from the LCD panel to the second lens plate. If the apparent size of the second lens plate can be reduced, the F-number will be reduced. That is, it is not necessary to brighten the projection lens.
- the projection lens 5 14 is a projection lens used in a conventional apparatus that does not perform polarization conversion or a lens close to the projection lens, it is possible to sufficiently realize high brightness of a projected image. I can do it.
- the light valve uses liquid crystal, which reduces contrast when the incident angle is wide, In this case, it is advantageous for improving the image quality.
- the light transmitted through the first, second, and third liquid crystal light valves 503, 505, and 511 is a dichroic prism that is a color synthesizing device.
- the light was guided on one optical axis by 5 13 and enlarged and projected by one projection lens 5 14 which is a projection optical system.
- the present invention is not particularly limited to this.
- a projection lens is provided for each color light so that the light emitted from the first, second, and third liquid crystal light valves 503, 505, and 511 for each color light can be enlarged and projected without using a color synthesis device. We will use the provided structure.
- the light valve is a transmissive liquid crystal.
- the present invention is not limited to this, and it is obvious that the same effect can be obtained if polarized light is applied.
- a projection type image display device using a light valve is constructed using the polarized light illuminating device 400 as an illuminating device, a light valve is provided for each color light using a color separation optical system as shown in FIG.
- a single-plate type shown in Embodiment 6 Fig.
- the polarized light illuminating device of the present invention can convert random light from a light source into an arbitrary polarization direction and suppress the spread of illuminating light (illumination The number can be increased), so that it can be widely used for lighting devices that require polarized light.
- all the random light from the light source can be used, and the light utilization factor can be greatly improved.
- the F-number of the illumination can be increased (the divergence angle of the incident light can be reduced), a high-brightness image can be obtained without changing the F-number of the projection optical system of the projection type image display device.
- the burden on the projection optical system is reduced, and the effect of the microphone lens can be easily obtained.
- the projection type image display device of the present invention can improve the light use efficiency with a simple configuration and improve the brightness of the projected image. Especially suitable as a projector
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/341,021 US6373629B1 (en) | 1997-12-01 | 1998-11-24 | Polarized light illuminator and projecting type image display |
EP98954807A EP0957387A4 (en) | 1997-12-01 | 1998-11-24 | POLARIZED LIGHT ILLUMINATOR AND PROJECTION TYPE IMAGE DISPLAY |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/329961 | 1997-12-01 | ||
JP32996197 | 1997-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999028780A1 true WO1999028780A1 (fr) | 1999-06-10 |
Family
ID=18227211
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/005279 WO1999028780A1 (fr) | 1997-12-01 | 1998-11-24 | Illuminateur a lumiere polarisee et affichage d'images de type a projection |
Country Status (6)
Country | Link |
---|---|
US (1) | US6373629B1 (ja) |
EP (1) | EP0957387A4 (ja) |
KR (1) | KR100328885B1 (ja) |
CN (1) | CN1146742C (ja) |
TW (1) | TW401709B (ja) |
WO (1) | WO1999028780A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001031385A1 (en) * | 1999-10-28 | 2001-05-03 | Koninklijke Philips Electronics N.V. | Optical element and projection system |
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US6404550B1 (en) | 1996-07-25 | 2002-06-11 | Seiko Epson Corporation | Optical element suitable for projection display apparatus |
US6552760B1 (en) * | 1999-02-18 | 2003-04-22 | Fujitsu Limited | Luminaire with improved light utilization efficiency |
JP3823659B2 (ja) | 2000-02-04 | 2006-09-20 | セイコーエプソン株式会社 | プロジェクタ |
US6532110B1 (en) | 2000-03-03 | 2003-03-11 | Agilent Technologies, Inc. | Polarization device |
JP2002023105A (ja) * | 2000-07-04 | 2002-01-23 | Seiko Epson Corp | 照明光学系及びこれを用いたプロジェクタ |
US7710669B2 (en) * | 2000-08-24 | 2010-05-04 | Wavien, Inc. | Etendue efficient combination of multiple light sources |
US6587269B2 (en) * | 2000-08-24 | 2003-07-01 | Cogent Light Technologies Inc. | Polarization recovery system for projection displays |
KR20030018740A (ko) | 2001-08-31 | 2003-03-06 | 삼성전자주식회사 | 투사 장치 |
JP2003297116A (ja) * | 2002-04-05 | 2003-10-17 | Honda Motor Co Ltd | 投光装置 |
DE10216169A1 (de) * | 2002-04-12 | 2003-10-30 | Zeiss Carl Jena Gmbh | Anordnung zur Polarisation von Licht |
JP4143435B2 (ja) * | 2003-02-12 | 2008-09-03 | キヤノン株式会社 | 照明光学系 |
KR100965877B1 (ko) * | 2003-06-13 | 2010-06-24 | 삼성전자주식회사 | 고효율 프로젝션 시스템 및 칼라화상 형성방법 |
JP4950446B2 (ja) * | 2005-06-23 | 2012-06-13 | キヤノン株式会社 | レンズアレイ光学系、投射光学ユニットおよび画像投射装置 |
JP5030134B2 (ja) * | 2005-08-18 | 2012-09-19 | 株式会社リコー | 偏光変換素子、偏光変換光学系および画像投影装置 |
JP4586743B2 (ja) | 2006-02-20 | 2010-11-24 | セイコーエプソン株式会社 | プロジェクタ |
KR100916623B1 (ko) * | 2007-06-12 | 2009-09-09 | 한국과학기술원 | 고개구수 렌즈의 입사광을 변조하기 위한 삼층 편광 변조장치 |
US8422132B2 (en) * | 2008-12-02 | 2013-04-16 | Shanghai Lexvu Opto Microelectronics Technology Co., Ltd. | Integrated planar polarizing device |
JP2012073524A (ja) * | 2010-09-29 | 2012-04-12 | Sanyo Electric Co Ltd | 投写型映像表示装置 |
JP2013068774A (ja) * | 2011-09-22 | 2013-04-18 | Sony Corp | 光学装置、および投影装置 |
JP6413366B2 (ja) * | 2014-06-09 | 2018-10-31 | セイコーエプソン株式会社 | 偏光変換素子、及びプロジェクター |
CN104090423B (zh) * | 2014-06-23 | 2017-08-01 | 京东方科技集团股份有限公司 | 透明显示装置 |
KR101836572B1 (ko) * | 2015-08-28 | 2018-03-09 | 현대자동차주식회사 | 차량용 램프 장치 |
CN107045255A (zh) * | 2017-02-03 | 2017-08-15 | 中国电子科技集团公司第五十五研究所 | 一种薄型液晶投影显示led偏光光源 |
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- 1998-11-24 WO PCT/JP1998/005279 patent/WO1999028780A1/ja not_active Application Discontinuation
- 1998-11-24 US US09/341,021 patent/US6373629B1/en not_active Expired - Fee Related
- 1998-11-24 KR KR1019997006937A patent/KR100328885B1/ko not_active IP Right Cessation
- 1998-11-24 EP EP98954807A patent/EP0957387A4/en not_active Withdrawn
- 1998-11-24 CN CNB988038803A patent/CN1146742C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
CN1251661A (zh) | 2000-04-26 |
KR20000070688A (ko) | 2000-11-25 |
EP0957387A1 (en) | 1999-11-17 |
EP0957387A4 (en) | 2003-03-12 |
TW401709B (en) | 2000-08-11 |
CN1146742C (zh) | 2004-04-21 |
US6373629B1 (en) | 2002-04-16 |
KR100328885B1 (ko) | 2002-03-15 |
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