US5311339A
Expired / Lapsed
US
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Liquid crystal display having a double-refracting compensation layer
Assignee: Kyocera Automotive and Industrial Solutions GmbH
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Filing: 1992-08-12
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Granted: 1994-05-10
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Expires: 2012-08-12
Abstract
Abstract A liquid-crystal display has a liquid-crystal cell (1) which is formed of two substrates (2) spaced apart from each other, and is filled with a nematic liquid-crystal substance (4). On the cell inner-space side, electrode layers (3) which can be acted on by voltage are arranged on the substrates (2). On the cell outside space side, a double-refracting compensation layer extends over the cell surface. Liquid-crystal cell (1) and compensation layer are arranged between two polarization filters (11). The compensation layer is developed over its surface with a plurality of regions adjacent to each other. The amount of the double refraction of the regions differs from each other by a small amount.
Inventors
- 👤 Werner Fertig
- 👤 Jurgen Wahl
- 👤 Thomas Ott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133636; G02F1/1347; G02F1/13471; G02F1/133631
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
168 words
A liquid-crystal display comprising a controllable liquid crystal cell; wherein the controllable liquid-crystal cell comprises two substrates arranged spaced apart from each other and being filled with a liquid-crystal substance; the cell further comprises electrode layers which can be acted on by voltage and are arranged on the substrates within the cell; the liquid crystal display further comprises a compensation layer arranged outside the cell and extending over a surface of the cell, the compensation layer being a double-refracting compensation layer; the display further comprises a polarization filter assembly having at least one filter, the filter assembly providing a filter in front of the liquid crystal cell and the compensation layer or behind the liquid crystal cell and the compensation layer or on opposite sides of the liquid-crystal cell and the compensation layer; and the compensation layer comprises a plurality of adjacent regions providing double refraction to light rays passing therethrough, the amount of the double refraction of neighboring regions differing by a small amount from each other.
Claim 2
Dependent Claim
168 words
A liquid-crystal display comprising a controllable liquid crystal cell; wherein the controllable liquid-crystal cell comprises two substrates arranged spaced apart from each other and being filled with a liquid-crystal substance; the cell further comprises electrode layers which can be acted on by voltage and are arranged on the substrates within the cell; the liquid crystal display further comprises a compensation layer arranged outside the cell and extending over a surface of the cell, the compensation layer being a double-refracting compensation layer; the display further comprises a polarization filter assembly having at least one filter, the filter assembly providing a filter in front of the liquid crystal cell and the compensation layer or behind the liquid crystal cell and the compensation layer or on opposite sides of the liquid-crystal cell and the compensation layer; and the compensation layer comprises a plurality of adjacent regions providing double refraction to light rays passing therethrough, the amount of the double refraction of neighboring regions differing by a small amount from each other.
Claim 3
Dependent Claim
27 words
A display according to claim 1, wherein the regions of different amount of double refraction have a smaller size than can be resolved by the human eye.
Claim 4
Dependent Claim
53 words
A display according to claim 1, wherein said double-refracting compensation layer comprises a non-controllable second liquid-crystal cell having two substrates spaced apart from each other and being filled with a twisted nematic liquid-crystal substance, the regions of different amount of double refraction being located on a surface of said second liquid crystal cell.
Claim 5
Dependent Claim
31 words
A display according to claim 3, wherein the liquid-crystal substance of either one or both the liquid-crystal cells is of the nematic type having a twist angle of 90° or more.
Claim 6
Dependent Claim
23 words
A display according to claim 1, wherein the regions of differing amounts of double refraction are formed by regions of different cell thickness.
Claim 7
Dependent Claim
35 words
A display according to claim 5, wherein the regions of different amount double refraction are formed by a plurality of depressions formed on a surface of the compensation layer facing said controllable liquid crystal cell.
Claim 8
Dependent Claim
40 words
A display according to claim 6, wherein the depressions have a depth which corresponds approximately to the amount of the differences in layer thickness of the liquid-crystal layer of the controllable liquid-crystal cell over the length of the surface thereof.
Claim 9
Dependent Claim
12 words
A display according to claim 6, wherein the depressions are distributed uniformly.
Claim 10
Dependent Claim
12 words
A display according to claim 6, wherein the depressions are distributed non-uniformly.
Claim 11
Dependent Claim
47 words
A display according to claim 6, wherein said double-refracting compensation layer comprises a non-controllable second liquid-crystal cell having two substrates spaced apart from each other and being filled with a twisted nematic liquid-crystal substance; and the depressions are formed on a substrate of the second liquid-crystal cell.
Claim 12
Dependent Claim
53 words
A display according to claim 6, wherein said double-refracting compensation layer comprises a non-controllable second liquid-crystal cell having two substrates spaced apart from each other and being filled with a twisted nematic liquid-crystal substance; and a surface of a substrate of the second liquid-crystal cell is provided with a coating having the depressions.
Claim 13
Dependent Claim
20 words
A display according to claim 1, wherein the double-refracting compensation layer comprises a plurality of layers of optically transmissive material.
Claim 14
Dependent Claim
31 words
A display according to claim 12, wherein a first and a second of the optically transmissive layers of the compensation layer are arranged on opposite sides of the controllable liquid-crystal cell.
Claim 15
Dependent Claim
19 words
A display according to claim 1, wherein the double refracting compensation layer is formed of at least one foil.
Claim 16
Dependent Claim
24 words
A display according to claim 14, wherein the regions of different amount of double refraction are produced by a temperature treatment of the foil.
Claim 17
Dependent Claim
29 words
A display according to claim 14, wherein regions of different amount of double refraction are formed by formation of a surface of the foil with a plurality of depressions.
Claim 18
Dependent Claim
12 words
A display according to claim 16, wherein the depressions are distributed uniformly.
Claim 19
Dependent Claim
12 words
A display according to claim 16, wherein the depressions are distributed non-uniformly.
Claim 20
Dependent Claim
13 words
A display according to claim 16, wherein the depressions are produced by embossing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-09 | 1997-11-08 | 1998-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-09 | 2001-11-08 | 2002-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-09 | 2005-11-08 | 2006-05-10 | $7700.00 | Window Closed / Lapsed |