Patent US5442467A successfully refreshed from Google Patents.
US5442467A
Expired / Lapsed
US
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Enhanced off-axis viewing performance and luminous efficiency of a liquid crystal display employing fiberoptic faceplate elements
Assignee: Thomson Licensing SAS
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Filing: 1994-03-21
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Granted: 1995-08-15
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Expires: 2014-03-21
Abstract
Abstract A transmissive, backlit color twisted-nematic or super-twisted-nematic liquid crystal display employing a front fiber-optic faceplate as a front retaining element of a liquid crystal cell that increases viewing angle between the display and a viewer while minimizing or eliminating undesirable variations in luminance, contrast ratio and chromaticity is described. This novel configuration effectively decouples the liquid crystal cell and other optical elements behind the front fiber optic faceplate from the angular orientation of the viewer with respect to the display. The liquid crystal display described in this invention further provides a high quality color display, without viewing parallax, using a color selection filter mosaic outside of the liquid crystal cell. The display also increases luminous efficiency and improves color saturation by concentrating the transmission of available backlight illumination through the use of a rear fiber-optic faceplate and a second rear-mounted mosaic of color interference filters.
Inventors
- 👤 Louis D. Silverstein
- 👤 Thomas G. Fiske
- 👤 Richard Bruce
- 👤 Robert A. Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:05
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/04; G02B6/06; G02B6/08; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/133524; G02F1/1336; G02F1/133602; G02F1/133604; Y; Y10; Y10S; Y10S385/00; Y10S385/901
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
107 words
A direct-view, rear-illuminated liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear linear polarizer; and a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device.
Claim 2
Dependent Claim
107 words
A direct-view, rear-illuminated liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear linear polarizer; and a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device.
Claim 3
Dependent Claim
24 words
The direct-view liquid crystal display device of claim 1, wherein a mosaic of color selection filters is located outside of said liquid crystal cell.
Claim 4
Dependent Claim
28 words
The direct-view liquid crystal display device of claim 1, further comprising a mosaic array of color absorption filters located on said front face of said front fiber-optic faceplate.
Claim 5
Dependent Claim
20 words
The direct-view liquid crystal display device of claim 1, further comprising a front polarizer adjacent to said front fiber-optic faceplate.
Claim 6
Dependent Claim
30 words
The direct-view liquid crystal display device of claim 4, wherein said front polarizer is located outside of said liquid crystal cell adjacent to said front face of said fiber-optic faceplate.
Claim 7
Dependent Claim
29 words
The direct-view liquid crystal display device of claim 1, wherein said front polarizer is located within said liquid crystal cell adjacent to said rear face of said fiber-optic faceplate.
Claim 8
Dependent Claim
32 words
The direct-view liquid crystal display device of claim 1, wherein the light input acceptance cone on said rear face is substantially less than the light output exit cone on said front face.
Claim 9
Dependent Claim
32 words
The direct-view liquid crystal display device of claim 1, wherein the light output exit cone on said front face is substantially greater than the light input acceptance cone on said rear face.
Claim 10
Dependent Claim
20 words
The direct-view liquid crystal display device of claim 1, wherein said liquid crystal layer is comprised of twisted nematic material.
Claim 11
Dependent Claim
20 words
The direct-view liquid crystal display device of claim 1, wherein said liquid crystal layer is comprised of super-twisted nematic material.
Claim 12
Dependent Claim
24 words
The direct-view liquid crystal display device of claim 1, further comprising a rear fiber-optic faceplate located between said rear diffuser and said rear polarizer.
Claim 13
Dependent Claim
145 words
A direct-view backlit liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear fiber-optic faceplate, said rear fiber-optic faceplate having a large light input acceptance cone at a rear face adjacent to said diffuser and a small light output exit cone output at a front face opposite said rear face; a rear polarizer; and a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device.
Claim 14
Dependent Claim
145 words
A direct-view backlit liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear fiber-optic faceplate, said rear fiber-optic faceplate having a large light input acceptance cone at a rear face adjacent to said diffuser and a small light output exit cone output at a front face opposite said rear face; a rear polarizer; and a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device.
Claim 15
Dependent Claim
31 words
The direct-view liquid crystal display device of claim 12, further comprising a front polarizer located outside of said liquid crystal cell adjacent to said front face of said front fiber-optic faceplate.
Claim 16
Dependent Claim
30 words
The direct-view liquid crystal display device of claim 12, further comprising a front polarizer located within said liquid crystal cell adjacent to said rear face of said front fiber-optic faceplate.
Claim 17
Dependent Claim
42 words
The direct-view liquid crystal display device of claim 12, wherein the light input acceptance cone on said rear face of said rear fiber-optic faceplate is substantially greater than the light output exit cone on said front face of said rear fiber-optic faceplate.
Claim 18
Dependent Claim
42 words
The direct-view liquid crystal display device of claim 12, wherein the light output exit cone on said front face of said rear fiber-optic faceplate is substantially less than the light input acceptance cone on said rear face of said rear fiber-optic faceplate.
Claim 19
Dependent Claim
20 words
The direct-view liquid crystal display device of claim 12, wherein said liquid crystal layer is comprised of twisted nematic material.
Claim 20
Dependent Claim
20 words
The direct-view liquid crystal display device of claim 12, wherein said liquid crystal layer is comprised of super-twisted nematic material.
Claim 21
Dependent Claim
165 words
A direct-view backlit liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear fiber-optic faceplate, said rear fiber-optic faceplate having a large light input acceptance cone at a rear face adjacent to said diffuser and a small light output exit cone output at a front face opposite said rear face; a rear polarizer; a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device; a mosaic array of color absorption filters located on said front face of said front fiber-optic faceplate; and a front polarizer.
Claim 22
Dependent Claim
165 words
A direct-view backlit liquid crystal display device, comprising in sequential order: a backlight source; a rear diffuser layer; a rear fiber-optic faceplate, said rear fiber-optic faceplate having a large light input acceptance cone at a rear face adjacent to said diffuser and a small light output exit cone output at a front face opposite said rear face; a rear polarizer; a liquid crystal cell including a rear glass layer with addressing elements and pixel ITO electrodes, a liquid crystal layer and a front fiber-optic faceplate as a front containing element substantially adjacent to said liquid crystal layer, said front fiber-optic faceplate having a small light input acceptance cone at a rear face adjacent to said liquid crystal layer and a large light output exit cone at a front face opposite said rear face to improve a viewing angle through the liquid crystal display device; a mosaic array of color absorption filters located on said front face of said front fiber-optic faceplate; and a front polarizer.
Claim 23
Dependent Claim
73 words
The direct-view liquid crystal display device of claim 19, further comprising a mosaic array of color interference filters or spectrally-selective holographic filters between said rear fiber-optic faceplate and said rear polarizer, said array of color interference or holographic filters corresponding exactly with said array of color absorption filters such that corresponding elements of each array correspond to same color elements of the other array and to same color pixels of the display device.
Claim 24
Dependent Claim
75 words
The direct-view liquid crystal display device of claim 19, further comprising a mosaic array of color interference filters or spectrally-selective holographic filters located between said rear fiber-optic faceplate and said front fiber-optic faceplate, said array of color interference or holographic filters corresponding exactly with said array of color absorption filters such that corresponding elements of each array correspond to same color elements of the other array and to same color pixels of the display device.
References Cited (Backward Citations)
US2400877A
Cited
US2481380A
Cited
US2544659A
Cited
US4183630A
Cited
US4349817A
Cited
US4486760A
Cited
US4344668A
Cited
USRE33882E
Cited
US4874227A
Cited
US4558255A
Cited
US4669813A
Cited
US4752806A
Cited
US4799050A
Cited
US4735495A
Cited
US5053765A
Cited
US4987043A
Cited
US5159478A
Cited
US5050965A
Cited
US5066512A
Cited
US5035490A
Cited
US5181130A
Cited
US5113285A
Cited
US5131065A
Cited
US5229872A
Cited
US5280371A
Cited
US5329386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-14 | 1999-02-13 | 1999-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-14 | 2003-02-13 | 2003-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-14 | 2007-02-13 | 2007-08-15 | $7700.00 | Window Closed / Lapsed |