WO1994006249B1 - Stroboscopic illumination system for video displays - Google Patents
Stroboscopic illumination system for video displaysInfo
- Publication number
- WO1994006249B1 WO1994006249B1 PCT/US1993/008412 US9308412W WO9406249B1 WO 1994006249 B1 WO1994006249 B1 WO 1994006249B1 US 9308412 W US9308412 W US 9308412W WO 9406249 B1 WO9406249 B1 WO 9406249B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hght
- light
- amended
- observer
- array
- Prior art date
Links
- 238000005286 illumination Methods 0.000 title claims abstract 27
- 230000003287 optical Effects 0.000 claims 14
- 239000003086 colorant Substances 0.000 claims 5
- 239000000758 substrate Substances 0.000 claims 4
- 238000003384 imaging method Methods 0.000 claims 3
- 210000003128 Head Anatomy 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 2
- 230000004397 blinking Effects 0.000 claims 2
- 239000004973 liquid crystal related substance Substances 0.000 claims 2
- 239000000463 material Substances 0.000 claims 2
- 238000000149 argon plasma sintering Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000000051 modifying Effects 0.000 claims 1
Abstract
In a flat panel autostereoscopic display full resolution equal to the number of pixels in the two-dimensional light valve array, which serves to generate images, is achieved by incorporating an illumination system (40-47) which makes use of stroboscopic light 5 sources or continuously lit light sources in combination with electro-optical shutter means (56). The lighting system when used in conjuction with a 2-D flat panel display, achieves image resolution exceeding several times the pixel resolution of the light valve array.
Claims
AMENDED CLAIMS
[received by the International Bureau on 28 February 1994 (28.02.94); original claims 1-11, 13-21, 26-31 and 40 amended; claims 12, 22-25 and 32-35 cancelled; new claims 57-69 added; remaining claims unchanged (11 pages)]
1. (amended) An improved illumination system for high resolution displays, characterized by:
a linear or point like light source;
an electronic means for controlling the on and off states of said light source in synchronization with the process of image generation on an electronically controllable light valve array;
optical focusing means spaced apart from and in front of said light source so as to focus the light into patterns of lines, line segments, or point like areas in a plane substantially adjacent to the light valve array, said 10 focusing light patterns illuminating selected portions of the light valve array.
2. (amended) The illumination system of claim 57 having means for repeatedly addressing the light valve array in row by row or column by column fashion, there being a finite time period between the address of any individual light valve (pixel) and the time that the valve has completed its change in transparency as a result of the address; further having means for timing the light source to turn on during the period between the time when the pixels that are in a section of the array generally in front of it have started their change in transparency, and the time when the pixels in said section are addressed again, the light source being turned off outside of these time 0 periods.
3. (amended) The illumination system of claim 57 in which the light sources and optical focusing means are positioned with respect to one another and the light valve array in such a way as to create rapidly blinking sets of lines or points of light for the purpose of creating high resolution 3D images.
4. (amended) The illumination system of claim 57 in which the light source and optical focusing means are positioned with respect to one another and the light valve array so as to focus rapidly blinking sets of lines or points of light close to or within the pixel layer of the array so as to create 2D images with a resolution exceeding the pixel resolution of the light valve array.
5. (amended) The illumination system of claim 57 in which mechanical means is provided for adjusting the position of said light sources in relation to each other and in relation to the optical focusing means.
6. (amended) The illumination system of claim 2 in which baffling means is provided between the light source and the optical focusing means so as to allow the light source to illuminate only the section of the light valve that is generally in front of it.
7. (amended) The illumination system of claim 57 which includes an electrically controlled light diffusing means placed between the light source and the optical focusing means, said diffusing means being capable of changing between a clear, transparent state and a light scattering, diffuse state under control of the user.
8. (amended) The illumination system of claim 57 which includes a passive light diffusing means between the light source and a plane upon which the optical focusing means focuses the light and creates the light patterns.
9. (amended) The illumination system of claim 8 in which the light diffusing means comprises a substrate and a diffusing material bonded to a surface of the substrate.
10. (amended) The illumination system of claim 9 in which the substrate comprises one or more sheets of transparent material, said sheets being mounted in contact with the rear most surface of the light valve on the side facing away from the observer.
11. (amended) The illumination system of claim 7 further comprising optical antireflection means on surfaces of at least one of the optical focusing means, the electrically controlled light diffusing means and between transparent components of different indices of refraction, or on surfaces between transparent components and air, so as to reduce reflections at these surfaces.
12. (cancel)
13. (amended) The illumination system of claim 57 in which the light sources are comprised of steady light emanating means and further comprising light transmission controlling means placed between the light sources and the observer to achieve a stroboscopic effect.
14. (amended) The illumination system of claim 13 in which said light transmission controlling means is an array of light valves.
15. (amended) The illumination system of claim 57 in which said array of light valves are electrically controlled liquid crystal devices.
16. (amended) The illumination system of claim 57 in which said light sources are of at least three different types, each type capable of emitting light of a different color.
17. (amended) An improved i-Uumination system for an autostereoscopic display characterized by:
a point like or linear light source and optical focusing means spaced apart from and in front of said light source so as to focus the light into arrays of lines, line segments, or point like areas on a plane substantially adjacent a light valve array, said focusing light patterns illuminating selected portions of the light valve array.
18. (amended) The illumination system of claim 58 including a non reflective, opaque barrier adjacent said light sources, configured in such a way as to prevent light from passing through it except at the light source locations.
19. (amended) The illumination system of claim 58 in which mechanical means is provided for adjusting the position of said light sources in relation to each other and in relation to the optical focusing means.
20 (amended) A display for image generation, characterized by: a stroboscopic illuminator including a plurality of multicolor light sources; means for sequentially flashing each of the light sources through each of its colors such that during each flash all of the light sources do not show the same color; an array of individually controllable light valves each having adjustable transparency located in front of the illuminator; and focussing means disposed between the illuminator and the array of light valves for focussing each color of light onto or adjacent the array for illuminating each light valve with one color of light during each flash.
21. (amended) The display of claim 20 in which the light valve array comprises rows and columns of the light valves.
22. (cancel)
23. (cancel)
24. (cancel)
25. (cancel)
26. (amended) The display of claim 20 in which the focussing means comprises a planar array of one of lenticular lenslets and fly's eye lenslets.
27. (amended) The display of claim 20 further comprising a non reflective, opaque barrier having a piurahty of apertures adjacent said hght sources, wherein each aperture is aligned with one of the hght sources.
28. (amended) The display of claim 20 further comprising a light baffle located between the hght sources and the focussing means such that each light source illuminates a section of a correspondingly aligned light valve.
29. (amended) The display of claim 20 further comprising passive hght diffusing means located between the focussing means and the hght valve array.
30. (amended) The display of claim 20 in which the focussing means includes an anti-reflection coating on a surface thereof.
31. (amended) The display of claim 20 in which the hght valve array is a liquid crystal display.
32. (cancel)
33. (cancel)
34. (cancel)
35. (cancel
36. In the autostereoscopic display of claim 1 having (1) a screen surface upon which is displayed, or imaged, a number of sets of thin parallel vertical hght emitting lines, each set containing a multiplicity of said lines, the members of each set being located in the areas between the members of the other sets, and each set capable of being independently turned on and off, said surface remaining dark between said emitting lines, (2) a hght valve array parallel to and in front of said screen, said light valve having individual picture elements, arranged in a regular pattern across its surface, said pattern possessing vertical columns of said picture elements, there being at least two vertical columns of picture elements for each of said hght emitting lines in each set of said lines, said hght emitting line being located behind and between said elements, so as to establish areas of space known to the art as "Viewing zones" in front of the display, within which an observer's eye sees all the hght lines of a given set behind either an odd or even set of pixel columns, (3) optionally said display is in color obtained by filtering light passing through said picture elements along said columns with filters of at least three colors, and (4) electronic means to cause the left eye image or a
(claim 36 con't.) stereoscopic image pair to be displayed on the odd or even columns of pixels, and the right eye image of a stereoscopic image pair to be displayed on the remaining columns of pixels; the improvement which comprises -a. incorporating a device capable of monitoring the position of the head of a person who is looking at the display, b. using information from this device to deteπnine which set of hght emitting lines is on, and which set of picture information is displayed on the odd or even columns of pixels of the display; c. selecting which hght line set is on and which set of information is displayed on which column of pixels according to which combination of hne set and image display, thereby causing the left eye viewing zone formed at the observers location to encompass the position of the observer's left eye, and the right eye zones to encompass the position of the observers right eye.
37. The device of claim 36 wherein two sets of independently controlled hght lines are produced, the members of each set being substantially to the left or right of the center line halfway between the members of the other set.
38. The device of claim 37 wherein, as the observer's head moves horizontally left or right, with his or her eyes within the viewing zones created by one hght line set, so that the observer's eyes approach the boundaries of the viewing zones, that hght line set turns off and the other set comes on, so that the new viewing zones formed by the second set now encloses the observer's eye locations; and as the observer continues to move, and the eyes approach the zone boundaries formed by the second set, the second set turns off and the first set turns on again, and simultaneously the left and right eye image information is switched between the odd and even pixel columns, such that when the first set comes on again, left and right eye
(claim 38 con't.) viewing zones are again positioned so as to enclose the observer's eye locations.
39. The device of claim 36 where the locus of the observer positions at which the light lines switch when the observer is moving to the right are to the right of the locus of positions where the hght lines switch when the observer is moving to the left, so as to not cause the hght line sets to switch rapidly when the observer is near a position where a change occurs.
40. The device of claim 36 where n sets of hght lines are present, n being a whole integer greater than 2, and as the observer who's eyes are within the viewing zones moves to the left or right, with one hght lines set on, defined as set one, and the as the observer's eyes move off center and thus approach the boundaries of the viewing zones, set one turns off and set two, generally being the next set in the direction opposite the observer's movement, turns on in order to create viewing zones that are more centered on the observer's eyes.
41. The device of claim 36 wherein three sets of hght lines are present, and as the observer who's eyes are near the center of the viewing zones moves to the left or right, with one hght lines set on, defined as set one, and the as the observer's eyes move off center and thus approach the boundaries of the viewing zones, set one turns off and set two, being the next set in the direction the same as the observer's direction of movement, turns on, while simultaneously the left and right eye images on the screen are switched between the odd and even columns,in order to create viewing zones more centered on the observer's eyes, so as to create left and right eye viewing zones which encompass the observer's left and right eyes, respectively.
57. (new) The illumination system of claim 1 in which the linear or point like hght source comprises a plurality of hght sources.
58. (new) The illumination system of claim 17 in which the linear or point like hght source comprises a piurahty of hght sources.
59. (new) The illumination system of claim 1 in which the optical focusing means comprises a lenticular lens sheet
60. (new) The illumination system of claim 1 in which the optical focusing means comprises a fly's eye lens sheet.
61. (new) The illumination system of claim 10 further comprising optical antireflection means on surfaces of the hght diffusing means and the transparent sheets of the substrate and between transparent components of different indices of refraction, or on surfaces between transparent components and air, so as to reduce reflections at these surfaces.
62. A method for image formation by field sequential color illumination, characterized by the steps of: providing an array of individually addressable hght valves each having adjustable transparency; providing a stroboscopic illuminator including a piurahty of multicolor hght sources for simultaneously illuminating the array of hght valves with hght of a piurahty of colors; addressing each of the light valves prior to ihuminating them to vary their transparency so as to modulate the intensity of the multicolored hght to form part of a color component of the image; and stroboscopically illuminating each of the hght valves with each of the multicolor hght sources for a finite time after they are addressed in such a way that hght of more than one of the piurahty of colors simultaneously illuminates different hght valves and each of the hght
(claim 62 con't.) valves is sequentially illuminated by light of ah of the colors, whereby a high resolution composite color image is displayed by the hght valve array.
63. The method of claim 62 further comprising the step of imaging the piurahty of multicolor hght sources on a passive diffuser located adjacent the array.
64. The method of claim 62 further comprising the step of imaging the piurahty of multicolor hght sources onto, or immediately adjacent, a plane containing the hght valve aπray.
65. The method of claim 64 in which the step of imaging the piurahty of multicolor hght sources comprises focussing the hght into patterns of one of lines, line segments and points.
66. The method of claim 65 in which the step of focussing the hght into patterns comprises the step of selectively ihuminating subregions of the individual hght valves.
67. The method of claim 62 further comprising the step of repeatedly addressing the array in one of a row by row and a column by column sequence, in which there is a finite time period between the address of any of the hght valves and the adjustment of the transparency of the hght valve due to the address, further in which the multicolor hght sources remain in an on state between the time when the hght valves have completed thier adjustment in transparency and when said hght valves are addressed again.
68. The display of claim 20 in which each of the hght valves comprises a subregion and further in which the focussing means further comprises means for ihuminating the subregion of each of the hght valves with hght of a different color.
69. A display for image generation, characterized by: a stroboscopic illuminator for producing multicolor illumination; an array of individually controllable hght valves each having adjustable transparency located in front of the illuminator; means for temporally and spatially interlacing the multicolored illumination on the array of hght valves.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP93921399A EP0659324B1 (en) | 1992-09-09 | 1993-09-07 | Stroboscopic illumination system for video displays |
| JP6507511A JPH08505014A (en) | 1992-09-09 | 1993-09-07 | Strobe lighting system for video display |
| CA002143617A CA2143617C (en) | 1992-09-09 | 1993-09-07 | Stroboscopic illumination system for video displays |
| DE69328371T DE69328371D1 (en) | 1992-09-09 | 1993-09-07 | STROBOSCOPIC LIGHTING SYSTEM FOR VIDEO DISPLAYS |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/942,718 US5410345A (en) | 1992-09-09 | 1992-09-09 | Stroboscopic illumination system for video displays |
| US08/024,670 US5428366A (en) | 1992-09-09 | 1993-03-01 | Field sequential color illumination system for liquid crystal display |
| US08/105,811 | 1993-08-17 | ||
| US07/942,718 | 1993-08-17 | ||
| US08/024,670 | 1993-08-17 | ||
| US08/105,811 US5349379A (en) | 1992-09-09 | 1993-08-17 | Autostereoscopic display illumination system allowing viewing zones to follow the observer's head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994006249A1 WO1994006249A1 (en) | 1994-03-17 |
| WO1994006249B1 true WO1994006249B1 (en) | 1994-04-14 |
Family
ID=27362374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1993/008412 WO1994006249A1 (en) | 1992-09-09 | 1993-09-07 | Stroboscopic illumination system for video displays |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0659324B1 (en) |
| JP (1) | JPH08505014A (en) |
| CA (1) | CA2143617C (en) |
| DE (1) | DE69328371D1 (en) |
| WO (1) | WO1994006249A1 (en) |
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1993
- 1993-09-07 DE DE69328371T patent/DE69328371D1/en not_active Expired - Lifetime
- 1993-09-07 JP JP6507511A patent/JPH08505014A/en active Pending
- 1993-09-07 WO PCT/US1993/008412 patent/WO1994006249A1/en active IP Right Grant
- 1993-09-07 EP EP93921399A patent/EP0659324B1/en not_active Expired - Lifetime
- 1993-09-07 CA CA002143617A patent/CA2143617C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9678267B2 (en) | 2012-05-18 | 2017-06-13 | Reald Spark, Llc | Wide angle imaging directional backlights |
| US9709723B2 (en) | 2012-05-18 | 2017-07-18 | Reald Spark, Llc | Directional backlight |
| US9910207B2 (en) | 2012-05-18 | 2018-03-06 | Reald Spark, Llc | Polarization recovery in a directional display device |
| US10365426B2 (en) | 2012-05-18 | 2019-07-30 | Reald Spark, Llc | Directional backlight |
| US9872007B2 (en) | 2013-06-17 | 2018-01-16 | Reald Spark, Llc | Controlling light sources of a directional backlight |
| US9740034B2 (en) | 2013-10-14 | 2017-08-22 | Reald Spark, Llc | Control of directional display |
| US9835792B2 (en) | 2014-10-08 | 2017-12-05 | Reald Spark, Llc | Directional backlight |
| US10634840B2 (en) | 2015-04-13 | 2020-04-28 | Reald Spark, Llc | Wide angle imaging directional backlights |
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