WO2005062116A1 - 二次元画像表示装置 - Google Patents
二次元画像表示装置 Download PDFInfo
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- WO2005062116A1 WO2005062116A1 PCT/JP2004/019059 JP2004019059W WO2005062116A1 WO 2005062116 A1 WO2005062116 A1 WO 2005062116A1 JP 2004019059 W JP2004019059 W JP 2004019059W WO 2005062116 A1 WO2005062116 A1 WO 2005062116A1
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- display device
- dimensional image
- image display
- wavelength
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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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
-
- 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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- 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
Definitions
- the present invention relates to a two-dimensional image display device, and more particularly to a two-dimensional image display device such as a video projector, a television receiver, and a liquid crystal panel which is improved.
- image projection devices have become widespread as two-dimensional image display devices using a high-pressure mercury discharge lamp as a light source.
- This device divides the light emitted from a high-pressure mercury discharge lamp into red light (long wavelength light), green light (intermediate wavelength light), and blue light (short wavelength light) using a wavelength selection mirror.
- These lights are individually modulated by a liquid crystal panel, multiplexed by a dichroic prism, and a color image is projected on a screen by a projection lens.
- the emission spectrum of the lamp covers the entire visible range, and the spectrum of the light split by the wavelength selective mirror has a relatively wide spectral width exceeding 100 nm. For this reason, a bright pure color cannot be displayed. Therefore, a laser display capable of more vivid color expression has attracted attention.
- This uses three types of laser light sources, red, green, and blue, and has a configuration as shown in FIG. 9, for example.
- reference numeral 200 denotes a laser display, which is a laser light source la-lc that emits laser light of three colors of RGB, a diffusion plate 6a-6c that diffuses light, and light emitted from the laser light source la-lc. And an optical system for irradiating each of the applied laser beams to the diffusion plates 6a-6c.
- the laser display 200 includes diffusion plate swinging means 13a-13c for swinging each of the diffusion plates 6a-6c, and the laser light sources lalclc diffused by the diffusion plate swinging means 13a-13c. And a spatial light modulator 7a-7c for modulating light from the light source.
- the laser display 200 is a dichroic prism 9 for multiplexing the light passing through each of the spatial light modulators 7a to 7c, and enlarges and projects the light multiplexed by the dichroic prism 9 on a screen 11. With projection lens 10!
- the laser light source la is a red laser light source that emits red laser light.
- the optical system corresponding to the red laser light source la converts the light emitted from the laser light source la. It has an expanding beam expander 2a and an optical integrator 3a for making the in-plane intensity distribution of the light expanded by the beam expander 2a uniform.
- the optical system includes a condenser lens 12a for condensing the light from the optical integrator 3a, a mirror 15a for reflecting the light condensed by the condenser lens 12a, and a reflected light from the mirror 15a.
- a field lens 8a for converting the light into a convergent beam and irradiating the light to the diffusion plate 6a.
- the laser light source lb is a green laser light source that emits green laser light.
- the optical system corresponding to the green laser light source lb equalizes the beam expander 2b for expanding the light emitted from the laser light source lb, and makes the cross-sectional intensity distribution of the light expanded by the beam expander 2b uniform.
- an optical integrator 3b The optical system further includes a condenser lens 12b for condensing light from the light integrator 3b, and converts the light condensed by the condenser lens 12b into a convergent beam and irradiates the light to the diffusion plate 6b.
- a field lens 8b is a field lens 8b.
- the laser light source lc is a blue laser light source that emits blue laser light.
- the optical system corresponding to the blue laser light source lc equalizes the beam expander 2c for expanding the light emitted from the laser light source lc and the cross-sectional intensity distribution of the light expanded by the beam expander 2c.
- Optical integrator 3c The optical system includes a condenser lens 12c for condensing the light from the light integrator 3c, a mirror 15c for reflecting the light condensed by the condenser lens 12c, and a reflection from the mirror 15c.
- a field lens 8c for converting light into a convergent beam and irradiating the light to a diffusion plate 6c.
- the lights from the red, green, and blue laser light sources la, lb, and lc are expanded by the beam expanders 2a, 2b, and 2c, respectively, and pass through the optical integrators 3a, 3b, and 3c and the condenser lenses 12a, 12b, and 12c.
- the optical paths are bent 90 degrees by mirrors 15a and 15c, and then illuminate spatial light modulators 7a, 7b, and 7c via field lenses 8a, 8b, and 8c and diffusion plates 6a, 6b, and 6c. I do.
- the light passes through the light integrators 3a, 3b, 3c, so that the illuminance distribution on the spatial light modulators 7a, 7b, 7c becomes uniform.
- the lights modulated independently by the spatial light modulators 7a, 7b, 7c are combined by the dichroic prism 9, are enlarged and projected by the projection lens 10, and are imaged on the screen 11. At that time, the laser light Because of high coherence, speckle noise is superimposed on the image projected on the screen.
- the diffusion plates 6a, 6b, 6c are oscillated by the diffusion plate moving means 13a, 13b, 13c, and this is suppressed by time-averaging the speckle noise.
- the most distinctive feature of the device shown in Fig. 9 is that the emission spectrum of the light from the laser light source is very narrow, for example, 5 nm or less, so that the color range that can be expressed by mixing the colors becomes very wide. is there.
- This is represented on a chromaticity diagram (1931 CIE chromaticity diagram) as shown in Fig. 7.
- the triangle indicated by the triangle indicates the color range of the video signal specified by the NTSC standard
- the triangle indicated by the triangle indicates the red light source with a center wavelength of 633 ⁇ m.
- the color range when a green light source with a center wavelength of 532 nm and a blue light source with a center wavelength of 457 nm are used.
- the laser display ex- cepts a small part of the blue region, and the color range (the region inside the three squares) is larger than the color range that can be represented by the NTSC signal (the region inside the three triangles). Area) is wide and vivid color expression is possible.
- the difference in the color range significantly affects the sharpness and realism of an image, so that a longer wavelength red light source and a shorter wavelength blue light source are used. Is required.
- a long-wavelength red light source or a short-wavelength blue light source is used, the visibility of the human eye drops rapidly, so a light source with a larger output is required.
- each light source is set to an optimal wavelength in view of a trade-off relationship between a wide color range and a required light source output. It has been considered necessary to do so.
- a red light source of 635 nm or less that does not significantly reduce visibility, and a blue light of 455 nm or more that similarly does not significantly reduce visibility. It is said that a light source should be used.
- Patent Document 1 JP-A-10-293268 (Pages 3 to 7, Figure 2 to Figure 6)
- a major problem in realizing the above laser display is the light emission efficiency of a laser light source.
- Conventional laser displays include helium neon lasers and krypton lasers. Some lasers use a gas laser such as a laser as a light source, and others use a laser that performs wavelength conversion by combining a YAG (Yttrium Aluminum Garnet) solid laser and a nonlinear optical element as a light source. These light sources have the disadvantage that the light source size and power consumption are large in order to realize a bright large screen display with relatively low luminous efficiency. As a result, the entire device has become large-scale, and has prevented the realization of a practical laser display.
- the present invention has been made to solve the above-mentioned conventional problems, and can solve the problems of large power consumption of a light source and a large light source size, and a two-dimensional light source capable of emitting pure white light.
- a light source and a large light source size and a two-dimensional light source capable of emitting pure white light.
- the two-dimensional image display device is a red light source that emits red light, a green light source that emits green light, a blue light source that emits blue light, and the light source of the three colors.
- It is characterized by being not less than 20 nm and not more than 455 nm.
- the center wavelength of the red light source is 635 nm or more and 655 nm or less.
- the center wavelength is 505 nm or more and 550 nm or less.
- the two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the light output of the blue light source and the light output of the green light source during white display are different.
- the ratio is 0.5: 1 or more and 4: 1 or less, and the ratio between the light output of the red light source and the light output of the green light source in white display is 0.4: 1 or more and 1.3: 1 or less. It is characterized by the following.
- a two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the central wavelength of the red light source is 635 nm or more and 655 nm or less. It is.
- a two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the center wavelength of the green light source is 505 nm or more and 550 nm or less. It is.
- a two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the center wavelength of the blue light source is 440 nm or more and 455 nm or less. It is.
- a two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the center wavelength of the blue light source is 440 nm or less. is there.
- a two-dimensional image display device is the two-dimensional image display device according to claim 1, wherein the blue light source is a gallium nitride-based semiconductor laser. That's what I do.
- a two-dimensional image display device is characterized in that, in the two-dimensional image display device according to claim 1, the red light source is a semiconductor laser based on AlGalnP. It is assumed that.
- the two-dimensional image display device according to claim 10 of the present invention is the two-dimensional image display device according to claim 1, wherein each of the light sources has an emission light equal to or less than that of a semiconductor laser light source. It has a spectral width.
- a red light source that emits red light a green light source that emits green light, a blue light source that emits blue light, and the three colors Means for forming a two-dimensional image using light from the light source of (1), wherein the center wavelength of the blue light source is not less than 420 nm and not more than 455 nm. It is possible to reduce the power consumption to a range in which a wide color range can be obtained, as a result.
- the center wavelength of the red light source is 635 nm or more and 655 nm or less
- the center wavelength of the green light source is 505 nm or more and 550 nm or less
- the center wavelengths of the red light source and the green light source can be made to be within a region where the light output is small and a relatively wide color range can be obtained. Power consumption can be reduced.
- the center wavelength as described above for each light source it is possible to suppress Smart white light emission can be realized.
- the light output of the blue light source and the green light source during white display are displayed.
- the ratio to the light output is 0.5: 1 or more and 4: 1 or less
- the ratio of the light output of the red light source to the light output of the green light source in white display is 0.4: 1 or more and 1. Since the ratio is set to 3: 1 or less, the center wavelength of the blue light source, the red light source, and the green light source can be set in a range where the light output is small and a wide color range can be obtained. Furthermore, by selecting the above center wavelength for each light source, it is possible to realize pure white light emission while suppressing the light output.
- the center wavelength of the red light source is 635 nm or more and 655 nm or less.
- the center wavelength of the red light source can be set within a range where the light output is small and a wide color range can be obtained.
- the center wavelength of the green light source is 505 nm or more and 550 nm or less.
- the center wavelength of the green light source can be set within a range where the light output is small and a wide color range can be obtained.
- the center wavelength of the blue light source is 440 nm or more and 455 nm or less. Therefore, the center wavelength of the blue light source can be set within a range where the light output is minimum and a wide color range can be obtained.
- the center wavelength of the blue light source is 440 nm or less.
- the light source can be made highly efficient and highly reliable.
- the blue light source is a gallium nitride-based semiconductor laser. Therefore, the blue light source can be downsized and highly efficient.
- the red light source is a semiconductor laser based on AlGalnP. Therefore, it is possible to reduce the size and efficiency of the red light source.
- the light emitted from each of the light sources is equivalent to a semiconductor laser light source. Since it has a spectrum width smaller than that, it is possible to express bright colors with a light source with a narrow spectrum width.
- FIG. 1 is a diagram showing a schematic configuration example of a two-dimensional image display device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing calculation results of a light source output required for white display with respect to a wavelength of a blue light source.
- FIG. 3 is a diagram showing calculation results of a light source required for white display with respect to a wavelength of a blue light source.
- FIG. 4 is a diagram showing calculation results of a light source required for white display with respect to a wavelength of a blue light source.
- FIG. 5 is a diagram showing a calculation result of a light source output required for white display with respect to a wavelength of a blue light source.
- FIG. 6 is a diagram showing calculation results of a light source output required for white display with respect to a wavelength of a red light source.
- FIG. 7 is a chromaticity diagram showing a color range that can be expressed by a laser projector and the NTSC standard.
- FIG. 8 is a diagram showing a relationship between an oscillation wavelength and an oscillation threshold of an AlGalnN-based semiconductor laser.
- FIG. 9 is a diagram showing a schematic configuration of a conventional two-dimensional image display device.
- FIG. 1 is a diagram showing a configuration example of a two-dimensional image display device according to Embodiment 1 of the present invention.
- reference numeral 100 denotes a two-dimensional image display device according to the first embodiment of the present invention.
- This two-dimensional image display device 100 uses a semiconductor laser as a blue light source and a red light source in the conventional two-dimensional image display device shown in FIG.
- the center wavelength of the red semiconductor laser 21a which is a red light source, is 635 nm to 655 nm
- the center wavelength of the blue semiconductor laser 21c which is a blue light source
- the center wavelength of the green laser 21b is 505 nm to 550 nm.
- the red semiconductor laser 21a and the blue semiconductor laser 21c are connected to high-frequency power supplies 25a and 25c, respectively, to broaden the oscillation spectrum.
- the beam expanders 2a-2c, the optical integrators 3a-3c, the optical system for irradiating the spatial light modulators 7a-7c with the condenser lenses 12a-12c, and the diffusion plates 6a-6c are formed as diffusion plates.
- the optical system that reduces the speckle noise by oscillating by the oscillating means 13a-13c, and the optical system (means for forming a two-dimensional image) that projects onto the screen 11 by the dichroic prism 9 and the projection lens 10 are conventional. It is similar to that of
- the two-dimensional image display device shown in FIG. 1 uses a semiconductor laser as an example of a blue light source and a red light source
- the light source is not limited to a semiconductor laser
- the emitted light is not limited to a semiconductor laser. Any light source having a spectrum width equal to or less than that is acceptable.
- super. Lumines sense. Diode (S U p er Luminescence Diode) may be used.
- S U p er Luminescence Diode S U p er Luminescence Diode
- the two-dimensional image display device of this embodiment is obtained by optimizing the range of the center wavelength of the blue light source and the red light source (the red semiconductor laser 21a and the blue semiconductor laser 21c in FIG. 1), and will be described in detail below. .
- the output required for each light source when the oscillation wavelength of the blue light source or the red light source was changed was calculated so that white light equivalent to the standard white light source was obtained while suppressing the output. .
- the maximum output required for each light source is determined by the output required to display bright white. Therefore, the light output for white display was calculated by considering the balance of the light source output of each of the three colors, which can be determined only by eye visibility. As a result, in the blue region where the luminosity changes monotonically with wavelength, the light output required for the wavelength of the light source varies monotonically. It has been found that there is a certain optimum wavelength at which the required light output is minimized. The results are shown in Figs.
- the chromaticity and luminous flux of a composite color when two types of light are mixed can be calculated according to the following equations. That is, the chromaticity of the composite color when the luminous flux of A1 lumen whose chromaticity coordinates are represented by (xl, yl) and the luminous flux of A2 lumen whose chromaticity coordinates are represented by (x2, y2) Coordinates (x3, y 3) and luminous flux A3 are
- x3 (y2 * xl * Al + yl * x2 * A2) / (y2 water Al + y 1 water A2)
- y3 y 1 * y2 * (yl + y2) / (y2 * Al + y 1 * A2)
- the light when the three colors of light are mixed is first calculated by using the above-described formula, using the chromaticity coordinates and the luminous flux of the composite color when the first and second two colors of the light are mixed. It can be obtained by calculating and further mixing the combined color and the third light.
- the luminous flux of the three colors of light corresponding to each point is determined at random, and the chromaticity coordinates and luminous flux of the composite color obtained by mixing the three colors are calculated.
- the chromaticity coordinates of the composite colors when the respective luminous fluxes are appropriately selected and mixed are calculated each time, and the chromaticity coordinates of the three composite colors are determined by the light of the standard white light source d65 (d is an abbreviation of daylight).
- Fig. 2 to Fig. 5 show that the center wavelength of the red light source is set to 635nm or 655nm, the center wavelength of the green light source is set to 505 or 535nm, and when the light output from the light source is mixed, the total luminous flux is 1000 lumens. And the respective light source outputs when the coordinates on the chromaticity diagram match the coordinates of the color of the standard white light source d65 are plotted against the wavelength of the blue light source.
- the center wavelength of the red light source and the center wavelength of the green light source are set as described above because the center wavelength of the red light source is 635 nm to 655 nm, the light output is small, and a wide color range can be obtained.
- the center wavelength of the green light source is 505 nm to 550 nm, the light output is small, and a wide color range can be obtained. Furthermore, for red light sources, expressible colors From the chromaticity diagram in Fig. 7, it can be predicted that the wavelength should be in the vicinity if NTSC is expanded from NTSC, and even if the wavelength is changed in this vicinity, the outline of the output graph of the blue light source The shape does not change qualitatively. In addition, the total luminous flux was set to 1000 lumens, because if a brightness comparable to that of a commercially available projector is to be secured, such a value is required.
- the center wavelength of the red light source is set to 635 nm or 655 nm or the center wavelength of the green light source is set to 505 nm or 550 nm
- the center wavelength of the blue light source is not changed. It has been found that the output can be suppressed in the range of 420 nm to 480 nm. Furthermore, if the center wavelength of the blue light source is 455 nm or more (region 103 in FIG. 2 to FIG. 5), a wide color range cannot be obtained, so the blue light source requires a small output and has a wide color range.
- the obtained 420 nm-455 nm is the optimal region (the optimal region 101 shown in Fig. 2-5).
- the ratio of the output of the blue light source and the output of the green light source during white display in this optimal region 101 is approximately 0.5: 1 to 4: 1, and the ratio of the output of the red light source and the green light source during white display is approximately 0.4: 1 or more and 1.3: 1 or less.
- the region (the region 102) of the center wavelength of 440 nm to 455 nm where the output is minimized is a more preferable region for the blue light source.
- the conventional laser display device uses a relatively long wavelength blue light source and a relatively short wavelength red light source.
- the center wavelength of the light source By setting the center wavelength of the light source to be 420 nm to 455 nm, the center wavelength of the red light source to be 635 ⁇ m to 655 nm, and the center wavelength of the green light source to be 505 nm to 550 nm, pure white light can be emitted with smaller output.
- a two-dimensional image display device capable of obtaining a wide color range can be realized.
- the center wavelength of the blue light source at 440 nm or more and 455 nm or less, it is possible to obtain pure white light while suppressing the output of the blue light source to a minimum.
- Db and Dr in Fig. 7 show the optimal region 101 of the blue light source and the region of the central wavelength of 635nm-655nm of the red light source in a chromaticity diagram, and it is possible to expand the color range. To help.
- the blue light source is limited to a semiconductor laser.
- the blue light source is sandwiched between a region 106 where the visibility is small, a region 103 where a wide color range cannot be obtained, and a region 105 where it is difficult to realize a high output blue semiconductor laser.
- the region 104 is the optimum region for the blue semiconductor laser. That is, the reason why a large output is required in the region 106 on the shorter wavelength side than the region 104 is that visibility deteriorates.
- the region on the longer wavelength side than 455 nm is also a region where it is difficult to realize a high-output blue semiconductor laser.
- the center wavelength of the light source in order to obtain an image having the same brightness with a small light output, it is preferable to set the center wavelength of the light source to about 435 nm to 455 nm.
- This region 104 overlaps with the optimum region 101 shown in FIGS. 2 to 5 in which the output of the blue light source requires a small output and a wide color range can be obtained. Helped to be effective.
- FIG. 6 shows that the center wavelength of the green light source is fixed at 532 nm and the center wavelength of the blue light source is fixed at 457 nm.
- the center wavelength of the green light source is set to 532 nm
- the center wavelength of the blue light source was set to 457 nm.
- the short wavelength region 205 of 635 nm or less is also a region where it is difficult to realize a high-output red semiconductor laser. Therefore, the optimum region 204 is 635 nm or more and 655 nm or less.
- the output ratio between the red light source and the green light source in this region 204 is approximately 1.8: 1 or more, and 5: 1 It is as follows.
- Db and Dr in Fig. 7 show the optimum region 104 of the blue semiconductor laser and the optimum region 204 of the red semiconductor laser in a chromaticity diagram, and it can be seen that the color range can be expanded.
- a laser light source that outputs light in a wavelength range capable of displaying a bright image with a smaller light output is a helium neon laser having a wavelength of 633 nm, a krypton laser having a wavelength of 647 nm, or a 630 nm wavelength in red.
- gas lasers such as helium-neon lasers and wavelength-converted lasers require large laser heads to realize bright displays with relatively low light emission efficiency, which leads to an increase in the size of the device or power consumption.
- drawbacks such as large.
- the AlGaInP semiconductor laser is smaller in size and higher in efficiency than the laser, and is advantageous for miniaturization of the device and lower power consumption.
- red semiconductor lasers having a power exceeding 100 mW has been put to practical use for recording / reproducing optical disk drives, which are being developed with increasing output.
- a projector of about 100 inches or less requires a light source output of 11 W, but unlike a light source for an optical disk drive, a light source for a projector has a small restriction on wavefront aberration.
- semiconductor lasers in excess of one watt are easily feasible.
- Another advantage of using a semiconductor laser is that by superimposing a high-frequency signal on a drive current, coherence is reduced, and speckle noise can be easily reduced.
- AlGalnP crystal is represented by the formula (AlxGal-x) InP, and the red semiconductor using this crystal is represented by the following formula:
- the band gap forbidden bandwidth
- a band gap of about 2.3 eV wavelength of about 540 nm
- the confinement of carriers (especially electrons) in the active layer becomes insufficient, and the reactive current increases due to an increase in overflow current.
- high-power operation and high-temperature operation become difficult. Due to this limitation, laser In order to obtain the output of several watts required for spraying at room temperature, the oscillation wavelength should be set to 635 nm or more.
- a blue laser light source that outputs light in a wavelength range capable of displaying a bright image with a smaller light output
- a 441 nm wavelength helium cadmium laser or a neodymium-doped YAG solid-state laser combined with a nonlinear optical element is used.
- This SHG laser converts laser light from a solid-state laser into half-wavelength light using a nonlinear medium of a nonlinear optical element.
- AlGalnN-based semiconductor lasers based on gallium nitride (AlGalnN-based) with a wavelength of 400 nm to 460 nm have been actively developed in recent years, and watt-class lasers are being realized.
- AlGalnN-based semiconductor lasers are smaller in size and higher in efficiency than the above-mentioned lasers.
- the center wavelength of the AlGalnN-based semiconductor laser changes depending on the composition ratio of In, and the longer the In composition ratio, the longer the wavelength of light can be obtained.
- concentration of In increases, the amount of In bias in the crystal increases, making it difficult to realize a highly efficient and reliable AIGaInN-based semiconductor laser that oscillates at a low threshold current.
- Several types of semiconductor lasers were prototyped with different In concentrations in the active layer region, and their oscillation wavelengths and oscillation threshold currents were measured.
- Figure 8 shows the results. As shown in the figure, the force at which the threshold current increases as the wavelength becomes longer increases beyond a wavelength of 440 nm, and the threshold rises markedly.
- Oscillation cannot be achieved in the region beyond the wavelength of 455 nm. From these results, it is preferable to use a laser with a wavelength of 455 nm or less in order to realize a two-dimensional image display device using an AlGalnN-based semiconductor laser. In addition, since it is more difficult to simultaneously achieve high output and long life in a semiconductor laser having a large threshold current, it is more preferable to use a laser having a wavelength of 440 nm or less. The use of this technique has the potential to realize a highly efficient and reliable two-dimensional image display device with a relatively small oscillation threshold.
- the blue light source was used.
- the center wavelength of the light source was set to 420 nm or more and 455 nm or less and the center wavelength of the red light source to 635 nm or more and 655 nm or less, it is possible to realize a two-dimensional image display device that is compact, highly efficient, and can obtain a wide color range. Power.
- the secondary image display device when the secondary image display device is realized by a semiconductor laser, a red semiconductor laser light source having a center wavelength of 635 nm to 655 nm is used, and a blue semiconductor laser light source is used.
- a laser with a center wavelength of 420 nm to 455 nm can solve the problem of large light source size, which consumes large power when using a gas laser or solid-state laser. It is possible to realize a two-dimensional image display device capable of emitting light.
- the output of the blue light source can be increased, and the reliability of the power can be improved.
- the present invention can also be applied to a rear projection display. Also, the present invention can be applied to a two-dimensional optical switch type display such as a liquid crystal panel type display using a laser light source as a knock light.
- the gallium nitride-based and AlGalnP-based semiconductor lasers described above may be used as the blue semiconductor laser light source and the red semiconductor laser light source, respectively.
- a semiconductor laser of another material may be used as long as blue or red oscillation is possible using a material. In this case, it is expected that the output characteristics of the semiconductor laser will change due to a change in the material system and composition of the semiconductor laser. It is needless to say that the present invention can be applied to the case where there is a region corresponding to.
- the two-dimensional image display device can reduce the power consumption of the light source and the size of the light source, can emit pure white light, and can be used as a video projector and a rear projection type television receiver. Useful.
- a projection type device by using a similar light source for the back illumination light, it can also be used for an optical switch type image display device such as a liquid crystal television and a liquid crystal display.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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KR1020067012367A KR101170570B1 (ko) | 2003-12-22 | 2004-12-21 | 이차원 화상 표시 장치 |
JP2005516490A JPWO2005062116A1 (ja) | 2003-12-22 | 2004-12-21 | 二次元画像表示装置 |
EP04807416A EP1703318A4 (en) | 2003-12-22 | 2004-12-21 | DEVICE FOR DISPLAYING TWO-DIMENSIONAL PICTURES |
US10/584,074 US7562988B2 (en) | 2003-12-22 | 2004-12-21 | Two-dimensional image display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003425599 | 2003-12-22 | ||
JP2003-425599 | 2003-12-22 |
Publications (1)
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WO2005062116A1 true WO2005062116A1 (ja) | 2005-07-07 |
Family
ID=34708820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/019059 WO2005062116A1 (ja) | 2003-12-22 | 2004-12-21 | 二次元画像表示装置 |
Country Status (6)
Country | Link |
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US (1) | US7562988B2 (ja) |
EP (1) | EP1703318A4 (ja) |
JP (1) | JPWO2005062116A1 (ja) |
KR (1) | KR101170570B1 (ja) |
CN (2) | CN1886696A (ja) |
WO (1) | WO2005062116A1 (ja) |
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CN100455029C (zh) * | 2005-12-16 | 2009-01-21 | 中国科学院长春光学精密机械与物理研究所 | 激光显示中颜色变换与色域扩展方法及装置 |
JP2013228530A (ja) * | 2012-04-25 | 2013-11-07 | Seiko Epson Corp | プロジェクター |
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US20090135375A1 (en) * | 2007-11-26 | 2009-05-28 | Jacques Gollier | Color and brightness compensation in laser projection systems |
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JP2013008950A (ja) * | 2011-05-23 | 2013-01-10 | Panasonic Corp | 光源装置および画像表示装置 |
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- 2004-12-21 CN CNA2009101597894A patent/CN101605267A/zh active Pending
- 2004-12-21 US US10/584,074 patent/US7562988B2/en active Active
- 2004-12-21 EP EP04807416A patent/EP1703318A4/en not_active Withdrawn
- 2004-12-21 WO PCT/JP2004/019059 patent/WO2005062116A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
EP1703318A1 (en) | 2006-09-20 |
JPWO2005062116A1 (ja) | 2007-12-13 |
US20070165184A1 (en) | 2007-07-19 |
CN1886696A (zh) | 2006-12-27 |
CN101605267A (zh) | 2009-12-16 |
KR101170570B1 (ko) | 2012-08-01 |
KR20060129228A (ko) | 2006-12-15 |
US7562988B2 (en) | 2009-07-21 |
EP1703318A4 (en) | 2010-08-04 |
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