Patent EP0627644A2 successfully refreshed from Google Patents.
EP0627644A2
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EP
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Image display device with backlighting
Assignee: Sharp Corp
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Filing: 1994-05-31
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Granted: —
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Expires: 2014-05-31
Abstract
Abstract An image display device based on liquid crystal panels is arranged for outputting a high quality image, specifically one in which the problem of the shadow border between pixels has been remedied. Embodiments of the display device employ various techniques to address the problem. One solution, a multi-pixelating technique, surrounds pixels with virtual images of pixel, where both the spacing and the range of the multi-pixelating are precisely controllable. In other solution, the divergence of the light incident upon the liquid crystal panel is carefully controlled. or the light field emerging from the liquid crystal panel is modulated, in order to project a carefully controlled pixel image intensity distribution onto a diffusely scattering surface. The techniques developed are applicable to color liquid crystal panels as well, and can be employed to perform a precisely interpolated color mixing of neighboring pixels. Some of the embodiments employ a specially designed lighting unit for providing white parallel rays to the liquid crystal device. Because of advantages in areas of size, weight and image quality, the display device is particularly suitable to head mounted displays.
Inventors
- 👤 Atsushi Yamanaka
- 👤 Hiroshi Hamada
- 👤 William Farmer
- 👤 Hiromi Kato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133621; G02B; G02B27/00; G02B27/02; G02B27/022; G02B27/024; G02B27/026; G02F1/133524; G02F1/133526
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
52 words
An image display device (1) arranged to use a display unit (3), characterized in that said display device incorporates a pixel multiplying means (4) located on a display unit surface of said display device, whereby input pixels displayed on said display unit are visually increased in number when said pixels are output.
Claim 2
Dependent Claim
20 words
An image display device according to Claim 1, characterized in that said display unit is a liquid crystal display (3).
Claim 3
Dependent Claim
24 words
An image display device according to Claim 1 or 2, characterized in that said pixel multiplying means comprises a micro lens array (4, 111).
Claim 4
Dependent Claim
35 words
An image display device according to Claim 3, characterized in that said micro lens array comprises a plurality of lenses, all of said lenses having non-equal focal distances relative to their horizontal and vertical axes.
Claim 5
Dependent Claim
22 words
An image display device according to Claim 3. characterized in that said micro lens array comprises lenses arranged in a matrix distribution.
Claim 6
Dependent Claim
22 words
An image display device according to Claim 3, characterized in that said micro lens array comprises lenses arranged in a delta distribution.
Claim 7
Dependent Claim
18 words
An image display device according to Claims 3, characterized in that said micro lens array comprises rectangular lenses.
Claim 8
Dependent Claim
19 words
An image display device according to Claims 3, characterized in that said micro lens array comprises hexagonal lenses (111).
Claim 9
Dependent Claim
29 words
An image display device according to Claim 1 or 2, characterized in that said pixel multiplying means is a mixed element comprising a micro lens array and a diffuser.
Claim 10
Dependent Claim
53 words
An image display device arranged to use a liquid crystal display (152), characterized in that said device comprises: a lighting means (151) for emitting scattered light for lighting said liquid crystal display; and a fine refracting means (153, 162, 174) for refracting in a predetermined way rays passed through said liquid crystal display.
Claim 11
Dependent Claim
30 words
An image display device according to Claim 10, characterized in that said fine refracting means is disposed inside of a glass plate that is integrated into said liquid crystal display.
Claim 12
Dependent Claim
25 words
An image display device according to Claim 10 or 11, characterized in that said fine refracting means comprises a fiber optics plate (153, 162, 174).
Claim 13
Dependent Claim
22 words
An image display device according to Claim 12, characterized in that said fiber optics plate has a magnification of one or more.
Claim 14
Dependent Claim
25 words
An image display device according to any one of Claims 1 to 13, said device further comprises a magnifying means (175) for magnifying said image.
Claim 15
Dependent Claim
36 words
An image display device according to any one of Claims 1 to 14, characterized in that said image displays are provided as a pair so that a user may observe a different display with each eye.
Claim 16
Dependent Claim
74 words
A display device characterized in that said device comprises: a lighting means (201) for emitting white parallel rays; a light valve (203) for controlling a transmittance of parallel rays emitted from said lighting means; a fine refracting means (204) for refracting said rays, said transmittance of which is controlled by said light valve, and for outputting said refracted rays; and a scattering means (207) for scattering the rays output from said fine refracting means.
Claim 17
Dependent Claim
44 words
A display unit according to Claim 16, characterized in that said scattering means is applied to one face of a glass. plate (209), and said fine refracting means comprises a micro Fresnel lens array (208) formed on the other surface of said glass plate.
Claim 18
Dependent Claim
21 words
A display unit according to Claim 16 or 17, characterized in that said fine refracting means comprises a binary optics element.
Claim 19
Dependent Claim
22 words
A display unit according to Claim 17 or 18, characterized in that said fine refracting means has a positive lens power (260-262).
Claim 20
Dependent Claim
22 words
A display unit according to Claim 17 or 18, characterized in that said fine refracting means has a negative lens power (250-252).
Claim 21
Dependent Claim
26 words
A display unit according to Claim 17 or 18, characterized in that said fine refracting means contains one or more eccentric lens (250, 252, 260, 262).
Claim 22
Dependent Claim
113 words
A display unit characterized in that said device comprises: a lighting means (201) for emitting white parallel rays; a coloring means (202) for putting three primary colors of red, green and blue to said parallel rays emitted from said lighting means through pixels and for outputting said colored rays; a light valve (203) for controlling a transmittance of said colored rays output from said coloring means; a fine refracting means (204) for refracting said colored rays, said transmittance of which is controlled by said light valve, and for outputting said refracted colored rays; and a mixing means (205) for mixing said rays colored by three primary colors output from said fine refracting means.
Claim 23
Dependent Claim
44 words
A display unit according to Claim 22, characterized in that said mixing means is formed on a face of a glass plate (231), and said fine refracting means comprises a micro Fresnel lens array (230) formed on the other face of said glass plate.
Claim 24
Dependent Claim
21 words
A display unit according to Claim 22 or 23, characterized in that said fine refracting means comprises a binary optics element.
Claim 25
Dependent Claim
21 words
A display unit according to Claim 23 or 24, characterized in that said fine refracting means has positive lens power (260-262).
Claim 26
Dependent Claim
21 words
A display unit according to Claim 23 or 24, characterized in that said fine refracting means has negative lens power (250-252).
Claim 27
Dependent Claim
26 words
A display unit according to Claim 23 or 24, characterized in that said fine refracting means contains one or more eccentric lens (250, 252, 260, 262).
Claim 28
Dependent Claim
74 words
A backlight device used as lighting means of said display unit according to any one of Claims 16 to 27, characterized by: a white point light source (302) for emitting white rays; a refracting means (303) for refracting rays emitted from said point light source; an optical fiber (304) for transmitting rays refracted by said refracting means; and a converting means (305) for converting said rays transmitted by said optical fiber into parallel rays.
Claim 29
Dependent Claim
18 words
A backlight device according to Claim 28, characterized in that said converting means contains one parabolic mirror (310).
Claim 30
Dependent Claim
20 words
A backlight device according to Claim 28, characterized in that said converting means contains a plurality of parabolic mirrors (320).
Claim 31
Dependent Claim
17 words
A backlight device according to Claim 28, characterized in that said converting means contains a Fresnel lens.
Claim 32
Dependent Claim
49 words
An image display device characterized in that: a display unit according to any one of Claims 16 to 22; a backlight unit according to any one of Claims 28 to 31; a signal generator for generating a video signal; and a signal transmitting unit for transmitting said video signal.
Claim 33
Dependent Claim
119 words
A color-mixing display device characterized in that said device comprises: a divergence control type lighting means (404, 432, 444) for emitting rays to be controlled about divergence; a filter (405, 434, 445) for transmitting rays of three primary colors, red, green and blue, of said rays emitted from said lighting means, selectively about pixels; a light valve (406, 435, 446) for controlling a transmittance of said rays of the three primary colors output from said filter at each of said pixels; and a back projection type screen (408, 436, 445) for receiving the rays of the three primary colors, said transmittances of which are controlled by said light valve from the back and reproducing an image from said rays.
Claim 34
Dependent Claim
45 words
A color-mixing display device according to Claim 33, characterized in that said lighting means contains a white fine surface light source (401) having a predetermined form, size and intensity distribution, and a refracting means (403) for refracting rays emitted from said fine surface light source.
Claim 35
Dependent Claim
21 words
A color-mixing display device according to Claim 33, characterized in that said fine surface light source (402) comprises an optical fiber.
Claim 36
Dependent Claim
56 words
A color-mixing display device according to Claim 33, characterized in that said lighting means comprises a color separation type light source (440-442) having a plurality of light sources for emitting rays of three primary colors, red, green and blue, and a refracting means (443) for refracting said rays output from said color separation type light source.
Claim 37
Dependent Claim
21 words
A color-mixing display device according to Claim 36, characterized in that said color separation type light source contains light-emitting diodes (440-442).
Claim 38
Dependent Claim
41 words
A color-mixing display device according to Claim 36, characterized in that said color separation type light source contains an optical fiber (450) for outputting diffuse light, and a coloring means (451) for coloring said diffuse light output from said optical fiber.
Claim 39
Dependent Claim
51 words
A color-mixing display device according to Claim 36, characterized in that said color separation type light source contains a fine surface light source (460), and a transmittance color display (461) for controlling an image reproduced on said back projection type screen based on rays emitted from said fine surface light source.
Claim 40
Dependent Claim
20 words
A color-mixing display device according to Claim 34 or 36, characterized in that said refracting means contains a parabolic mirror.
Claim 41
Dependent Claim
20 words
A color-mixing display device according to Claim 34 or 36, characterized in that said refracting means contains a Fresnel lens.
Claim 42
Dependent Claim
50 words
A color-mixing display device according to Claim 33, characterized in that said lighting means comprises a back light unit (470) for emitting diffuse light, and a light direction control means (471,472) for transmitting only said diffuse light within a predetermined divergence range within said light emitted from said backlight unit.
Claim 43
Dependent Claim
48 words
A display device in which light is projected from behind through a display panel comprising a matrix of picture elements, wherein an optical system provided in front of the display panel produces an image display for viewing in which there are multiple neighbouring images of each picture element.
Claim 44
Dependent Claim
42 words
A display device in which light is projected from behind through a display panel comprising a matrix of picture elements, wherein an optical system provided in front of the display panel produces local distribution of the light transmitted by each picture element.
Claim 45
Dependent Claim
20 words
A display device according to claim 44, wherein the optical system comprises a respective waveguide means for each picture element.
Claim 46
Dependent Claim
60 words
A head-mounted display device comprising a light-transmissive display panel and means for projecting light through the display panel, the light-projecting means comprising optical fibre means connectable to a light source external to the display device and means for converting light emitted, within the display device, from the optical fibre means into rays of parallel light directed toward the display panel.
References Cited (Backward Citations)
No citation records indexed.
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