WO2003105180A1 - Picture display device with reduced deflection power - Google Patents
Picture display device with reduced deflection power Download PDFInfo
- Publication number
- WO2003105180A1 WO2003105180A1 PCT/IB2003/002238 IB0302238W WO03105180A1 WO 2003105180 A1 WO2003105180 A1 WO 2003105180A1 IB 0302238 W IB0302238 W IB 0302238W WO 03105180 A1 WO03105180 A1 WO 03105180A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- display screen
- aspect ratio
- long axis
- line
- cone portion
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
- H01J29/76—Deflecting by magnetic fields only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/86—Vessels and containers
- H01J2229/8603—Neck or cone portions of the CRT vessel
- H01J2229/8606—Neck or cone portions of the CRT vessel characterised by the shape
Definitions
- the invention relates to a picture display device comprising a cathode ray tube comprising an elongated display screen with a long axis and a short axis, a cone portion, a neck portion comprising means for generating three in-line electron beams, and a deflection system mounted on said cone portion for generating electromagnetic fields for deflecting said electron beams across the screen, wherein a line scanning direction is parallel to the long axis of the display screen.
- US 5,962,964 discloses a picture display device having CRT that comprises a cone portion whose cross section varies gradually from a circular shape at the neck end of the cone portion to a substantially rectangular shape at the display screen end of the cone portion.
- the deflection system can therefore be positioned closer to the envelope of the electron beam(s) than within CRTs whose cone have circular cross sections. Magnetic losses are thereby reduced and as a result less deflection power is needed.
- the picture display device is characterized in that a cross-section of the cone portion comprises a first section, near the neck portion, having a long axis and a short axis transverse to each other, wherein the short axis is parallel to the long axis of the display screen, the outer circumference of the cone portion having a second section, further away from the neck, having a long axis and a short axis transverse to each other, wherein the short axis is parallel to the short axis of the display screen.
- the cone portion shows a cross-section in which the aspect ratio, i.e. the ratio between the x- and y-dimensions, wherein the x-direction is parallel to the long axis of the display screen, which is also parallel to the line scanning direction, changes gradually from the aspect ratio of the neck (usually 1), to the aspect ratio of the display screen (e.g. 4/3 or 16/9).
- the aspect ratio i.e. the ratio between the x- and y-dimensions, wherein the x-direction is parallel to the long axis of the display screen, which is also parallel to the line scanning direction
- a part of the cone portion near the neck has a more or less rectangular cross-section of which the long axis and short axis are oriented such that the long axis is not parallel to the long axis of the display screen, but the short axis is parallel to the long axis of the display screen.
- the invention makes it possible to bring the line deflection coils on average closer to the deflected electron beams there where the initial deflection takes place.
- a major part of the deflection power is needed for the line deflection coils.
- the possible reduction in line deflection power carries a cost, namely the cost of a somewhat increased distance between the deflected electron beams and the frame deflection coils thereby increasing the required frame deflection power, but in total, a reduction of deflection power is obtainable.
- the minimum value of the aspect ratio between the outer dimension of the cone portion along a direction parallel to the long axis of the display screen and outer dimension pe ⁇ endicular to the long axis of the display screen is between 0.60 and 0.95, most preferably between 0.70 and 0.90.
- the aspect ratio of the screen itself is e.g. 4/3 or 16/9.
- the cone portion has a part near the neck portion for which said aspect ratio is smaller than 1 and the aspect ratio of the cone portion changes, going from the neck towards the screen, into a value larger than 1, and near the display screen attains a value of or near the aspect ratio of the screen (e.g. 4/3 or 16/9, depending on the design of the screen of the cathode ray tube).
- Too small a ratio (smaller than 0.70 and even more so for values smaller than 0.60) will lead to rather complex designs of the cone portion forcing substantial changes in the designs of deflection units and deflection coils. Nalues of larger than 0.95 will give a relatively small positive effect.
- deflection power (a further reduction of several percent of the deflection power, in comparison to prior art is possible) may be used advantageously to increase the maximum deflection angle of the electron beam(s).
- maximum deflection angles larger than or equal to 120° are realized. This is useful to build more slim CRTs.
- Fig.l is a sectional view of a picture display device according to an embodiment of the invention.
- Fig.2 is a sectional view of the display window
- Fig.3 illustrates the outer circumferences of a cone portion of a CRT for or of a display device in accordance with the invention
- Fig.4 illustrates in graphical form the aspect ratio as function of z in case the in-line plane is oriented parallel to the long axis;
- Fig.5 illustrates the aspect ratio as a function of z for several embodiments of the invention z in case the in-line plane is oriented parallel to the long axis;
- Fig.6 shows the aspect ratio A as a function of z, for a 32", 16:9, 105° deflection tube, in case of the in-line plane being oriented parallel to the short axis;
- Fig.7 shows the aspect ratio A as a function of z, for a 32", 16:9, 120° deflection tube, in case of the in-line plane being oriented parallel to the short axis of the screen.
- the display device comprises a cathode ray tube 1, which includes a display window 2, a cone portion 3, and a neck portion 4 (or neck as it is called herein below).
- a cathode ray tube 1 which includes a display window 2, a cone portion 3, and a neck portion 4 (or neck as it is called herein below).
- the neck 4 there are means 5 for generating three in-line electron beams 6, oriented within a so-called in-line plane.
- an electron gun is usually employed.
- the inner surface of the display window 2 comprises a large number of phosphor elements, which form a display screen 8.
- the middle one of the electron beams 6 substantially coincides with the tube axis 7.
- the direction of the tube axis is herein below denoted by the z-direction.
- the direction along the long axis of the display screen is denoted by the x-direction, the direction along the short axis of the display screen by the y- direction.
- the line scanning direction i.e. the direction in which scanning with the highest frequency takes place
- the electron beams 6 are deflected by means of a deflection system 9 covering a part 3a of the cone portion 3. It is in particular this part 3a of the outer contour that the invention relates to.
- Said deflection system 9 comprises a line deflection subsystem 12 and a frame deflection subsystem 13, in order to create a two-dimensional picture on the display screen 8.
- the deflection system 9 is made up of sets of coils, one set for the line deflection subsystem 12 and another set for the frame deflection subsystem 13.
- the outer circumference of the cone portion comprises a first section I near the neck and a second portion II further away from the neck, more towards the screen.
- Plane 11 is the so-called deflection plane.
- the deflection plane is the plane from which the deflected beams seem to originate, as is schematically shown for deflected beam 10.
- the figure also indicates the x-direction, i.e. the direction along the long axis of the display screen and the z-direction.
- the z-coordinate of the deflection plane is usually (and herein below) taken to be zero, with positive values of z being closer to the display screen.
- the in-line plane is oriented parallel to the long axis of the display screen.
- the in-line plane may be oriented either parallel to the long axis 21 (a situation relating to Figs. 2-5) or parallel to the short axis 22 (relating to Figs. 6-7).
- the display screen 8 has an elongated shape with two perpendicular axes of symmetry: a long axis 21 whose length is L scr and a short axis 22 whose length is S scr .
- a scr is usually 4/3 (1.333) or 16/9 (1.78).
- the invention relates to the aspect ratio of the cone portion, and more in particular the cone portion under the deflection unit.
- the outer circumference of the cone portion is either circular (i.e. having an aspect ratio of 1, in which case the inside of the deflection unit is also substantially circular) or changes gradually from circular (aspect ratio 1) to rectangular in accordance with the aspect ratio of the display screen.
- the aspect ratio of the cone portion is for a first part of the cone portion, i.e. a part near the neck, less than 1, changing into a value larger than 1 as a function of z.
- Figure 3 illustrates such a design.
- the figure shows as a function of z the outer circumference of the cone portion.
- Each outer circumference comprises in this example a substantially horizontal part 31 (i.e. extending along the x- or scanning direction) with a large radius of curvature, a substantially vertical part 32 (i.e. extending along the y or frame direction) with a large radius of curvature, and a corner part 33 with a center of curvature 34.
- the smallest cross-section shown is the part nearest the neck portion which in this example is circular, so that the first cross-section is circular, the next smallest one is near the neck portion, the largest ones are nearest the screen, i.e. for the largest values of z.
- the y-dimension is larger than the x-dimension, for instance for the cross-section to which the numbers 31 to 34 are attached, the x:y ratio is 18:22.
- the x:y aspect ratio is larger than 1 , for instance for the largest cross-section shown here the x-dimension is 60, while the y-dimension is 56.
- This change in form of the outer circumference from a form elongated in the frame direction (near the neck portion), to a form elongated in the scanning direction (towards the screen) enables a reduction of the power dissipation.
- the line scanning deflection coils can be brought closer to the electron beams.
- Lines 36 show the positions of the deflected beams in maximum deflection, respectively for 6% overscan.
- the neck portion itself is circular.
- the angle ⁇ rna x (i.e. the angle that the arrows form with the x-axis) changes from an angle well over 45 degrees (near the neck portion), and in this example starting with a value of 90 degrees, to an angle below 45 degrees, approaching the angle corresponding to the arctangent of the aspect ratio of the display screen A scr for z-positions near the display screen.
- the following mathematical construction method (without being restricted to such a method) can be used to calculate the outer contour. It is assumed that the radii of curvature of parts 31, 32 and 34 remain the same throughout the cone (but usually not equal to each other, since the radii of curvature of parts 31 and 32 are much larger than that of part 33).
- the radius of curvature of part 33, the corner part is set to be equal to the radius of curvature of the neck part, to obtain a smooth transition from the neck part to the cone portion. A smooth transition increases the strength of the cone. For each point on the line 36, i.e.
- the distance in the x-direction between the outer contour and the line 36 can be made small, enabling the line deflection coils to be brought close to the electron beams, reducing the deflection power, be it at a cost of increasing the distance along the y-direction.
- the aspect ratio changes from 1 to values smaller than 1 in a first section I to a value larger than 1 in a second section II.
- the angle ⁇ changes from an angle larger than 45 degrees (roughly 90 degrees in this preferred embodiment) to an angle smaller than 45 degrees.
- the first section I and the second section II are indicated in figure 4, the vertical line indicating the border between the first and second section. This borderline lies preferably at or near (within roughly 3 cm) of the deflection plane.
- the border between the parts I and II lies near the deflection plane, near being within 30 mm (seen in the z-direction) from the deflection plane.
- the aspect ratio as a function of the longitudinal position (z-axis) is presented for the case that the in-line plane is oriented parallel to the long axis (conventionally extending in the horizontal direction) of the screen. This orientation of the in-line plane with respect to the screen is called normal scan.
- CRT tubes having a shape as discussed require a minimal energy for deflecting the electron beams across the screen.
- Figs. 6 and 7 shapes are presented for CRT tubes in which the in-line plane is oriented parallel to the short axis of the screen (which is conventionally the vertical direction).
- Fig.6 shows the aspect ratio A as a function of z (expressed in mm), for a 32", 16:9, 105° deflection tube, in case of the in-line plane being oriented parallel the short axis of the screen for the red beam (the electron beam deflected to hit the red phosphor elements on the screen) deflected to the corner of the screen.
- the vertical line in the Figure corresponds to with the z-position for which the aspect ratio is equal to 1, which is located under the deflection unit.
- the z-values left of the vertical line (corresponding to the first portion I) have an aspect ratio A smaller than 1, even below 0.2, and z-values on the right hand sight (portion II) have an aspect ratio A larger or equal to 1.
- Such a longitudinal profile provides an optimal CRT shape with respect to the minimal required deflection energy for this tube.
- Fig. 7 shows the aspect ratio A as a function of z (expressed in mm), for a 32", 16:9, 120°-deflection tube, in case of the in-line plane being oriented parallel to the short axis of the screen.
- the vertical line in the Figure corresponds with the z-position for which the aspect ratio is equal to 1.
- the z-values left of the vertical line (corresponding to the first portion I) have an aspect ratio A smaller than 1 and z-values on the right hand sight (portion II) have an aspect ratio A larger than or equal to 1.
- Such a longitudinal profile provides an optimal CRT shape with respect to the minimal required deflection energy for this tube.
- a picture display device comprises a cathode ray tube 1 with an elongated display screen 8 and a deflection system 9 for deflecting electron beams.
- the display screen 8 is substantially rectangular with a long and a short axis.
- the line scanning direction is parallel to the long axis of the display screen.
- the cathode ray tube comprises a neck portion and a cone portion positioned between the screen and the neck portion. This cone portion has an aspect ratio (ratio of x and y dimension), which is near the neck below unity (aspect ratio ⁇ l) and changes to above unity (aspect ratio>l) further away from the neck, i.e. closer to the screen.
- the invention resides in each and every novel characteristic feature and each and every combination of characteristic features.
- Reference numerals in the claims do not limit their protective scope.
- Use of the verb "to comprise” and its conjugations does not exclude the presence of elements other than those stated in the claims.
- Use of the article "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
- the means for generating three in-line electron beams may for instance be constituted by an electron gun in which (as in standard designs) three electron beams are generated but electrodes are common, or by three separate electron guns. However, other means for generating electron beams may be used, departing from the standard designs.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004512159A JP2005529460A (en) | 2002-06-07 | 2003-05-22 | Image display device capable of reducing power for deflection |
US10/516,989 US20050174031A1 (en) | 2002-06-07 | 2003-05-22 | Picture display device with reduced deflection power |
AU2003228077A AU2003228077A1 (en) | 2002-06-07 | 2003-05-22 | Picture display device with reduced deflection power |
KR10-2004-7019615A KR20050008771A (en) | 2002-06-07 | 2003-05-22 | Picture display device with reduced deflection power |
EP03725546A EP1514290A1 (en) | 2002-06-07 | 2003-05-22 | Picture display device with reduced deflection power |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02077227.3 | 2002-06-07 | ||
EP02077227 | 2002-06-07 | ||
EP02080116 | 2002-12-05 | ||
EP02080116.3 | 2002-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003105180A1 true WO2003105180A1 (en) | 2003-12-18 |
Family
ID=29737940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/002238 WO2003105180A1 (en) | 2002-06-07 | 2003-05-22 | Picture display device with reduced deflection power |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1514290A1 (en) |
JP (1) | JP2005529460A (en) |
KR (1) | KR20050008771A (en) |
CN (1) | CN1659676A (en) |
AU (1) | AU2003228077A1 (en) |
TW (1) | TW200403701A (en) |
WO (1) | WO2003105180A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1667197A3 (en) * | 2004-09-30 | 2006-10-04 | Matsushita Toshiba Picture Display Co., Ltd. | Cathode ray tube |
US7265484B2 (en) | 2004-08-05 | 2007-09-04 | Matsushita Toshiba Picture Display Co., Ltd. | Color picture tube with curved shadow mask |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4109274A1 (en) * | 1991-03-21 | 1992-09-24 | Thomson Brandt Gmbh | COLORED PIPES |
US6373183B1 (en) * | 1998-12-15 | 2002-04-16 | Samsung Sdi Co., Ltd. | Funnel having vertically long neck portion |
-
2003
- 2003-05-22 EP EP03725546A patent/EP1514290A1/en not_active Withdrawn
- 2003-05-22 AU AU2003228077A patent/AU2003228077A1/en not_active Abandoned
- 2003-05-22 CN CN038131080A patent/CN1659676A/en active Pending
- 2003-05-22 WO PCT/IB2003/002238 patent/WO2003105180A1/en not_active Application Discontinuation
- 2003-05-22 KR KR10-2004-7019615A patent/KR20050008771A/en not_active Application Discontinuation
- 2003-05-22 JP JP2004512159A patent/JP2005529460A/en active Pending
- 2003-06-03 TW TW092115126A patent/TW200403701A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4109274A1 (en) * | 1991-03-21 | 1992-09-24 | Thomson Brandt Gmbh | COLORED PIPES |
US6373183B1 (en) * | 1998-12-15 | 2002-04-16 | Samsung Sdi Co., Ltd. | Funnel having vertically long neck portion |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7265484B2 (en) | 2004-08-05 | 2007-09-04 | Matsushita Toshiba Picture Display Co., Ltd. | Color picture tube with curved shadow mask |
EP1667197A3 (en) * | 2004-09-30 | 2006-10-04 | Matsushita Toshiba Picture Display Co., Ltd. | Cathode ray tube |
US7242137B2 (en) | 2004-09-30 | 2007-07-10 | Matsushita Toshiba Picture Display Co., Ltd. | Cathode ray tube with cone having non-circular cross-section |
Also Published As
Publication number | Publication date |
---|---|
CN1659676A (en) | 2005-08-24 |
AU2003228077A1 (en) | 2003-12-22 |
TW200403701A (en) | 2004-03-01 |
KR20050008771A (en) | 2005-01-21 |
JP2005529460A (en) | 2005-09-29 |
EP1514290A1 (en) | 2005-03-16 |
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