Patent US5076668A successfully refreshed from Google Patents.
US5076668A
Expired / Lapsed
US
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Gain reflector-liquid crystal display
Assignee: Tyco International Ltd Bermuda
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Filing: 1990-07-23
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Granted: 1991-12-31
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Expires: 2010-07-23
Abstract
Abstract A display apparatus comprising a display medium and a gain reflector disposed behind the display medium for reflecting incident light. The display medium may comprise a liquid crystal material containing a dye that conforms to the structure of the liquid crystal material and a containment medium for inducing distorted alignment of the liquid crystal material which in response to such alignment scatters and absorbs light and which response to a prescribed input reduces the amount of such scattering and absorption.
Inventors
- 👤 Andrew L. Dalisa
- 👤 James McCoy
- 👤 Richard Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553; G02F1/1334; G02F1/137; G02F1/13743; G02F1/1375; G02F1/03; G02F1/055; G02F1/13756
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A display apparatus comprising: a liquid crystal means at a viewing side of the display; said liquid crystal means comprising a liquid crystal material in a containment medium means for inducing a distorted alignment of said liquid crystal material which in response to such alignment at least one of scatters and absorbs light and which in response to a prescribed input reduces the amount of such scattering and absorption; and a gain reflector means disposed behind said liquid crystal means for reflecting light passing through said liquid crystal means wherein the contrast ratio of the display is increased by the gain of said gain reflector.
Claim 2
Dependent Claim
105 words
A display apparatus comprising: a liquid crystal means at a viewing side of the display; said liquid crystal means comprising a liquid crystal material in a containment medium means for inducing a distorted alignment of said liquid crystal material which in response to such alignment at least one of scatters and absorbs light and which in response to a prescribed input reduces the amount of such scattering and absorption; and a gain reflector means disposed behind said liquid crystal means for reflecting light passing through said liquid crystal means wherein the contrast ratio of the display is increased by the gain of said gain reflector.
Claim 3
Dependent Claim
127 words
A display apparatus comprising: a liquid crystal means disposed at a viewing side of the display; said liquid crystal means comprising operationally nematic liquid crystal containing a dye and a containment medium means for containing plural volumes of the liquid crystal and dye, said containment medium means having surface means for distorting the natural structure of the liquid crystal to cause the dye to increase light absorption, and the liquid crystal being responsive to a prescribed input to reduce the amount of such light absorption; and gain reflector means for reflecting light incident thereon, said gain reflector means disposed at a non-viewing side of the display behind said liquid crystal means wherein the contrast ratio of the display is increased by the gain of said gain reflector.
Claim 4
Dependent Claim
127 words
A display apparatus comprising: a liquid crystal means disposed at a viewing side of the display; said liquid crystal means comprising operationally nematic liquid crystal containing a dye and a containment medium means for containing plural volumes of the liquid crystal and dye, said containment medium means having surface means for distorting the natural structure of the liquid crystal to cause the dye to increase light absorption, and the liquid crystal being responsive to a prescribed input to reduce the amount of such light absorption; and gain reflector means for reflecting light incident thereon, said gain reflector means disposed at a non-viewing side of the display behind said liquid crystal means wherein the contrast ratio of the display is increased by the gain of said gain reflector.
Claim 5
Dependent Claim
24 words
The apparatus of claim 2 wherein said gain reflector means provides that specular reflection from the display is angularly offset from the reflected gain.
Claim 6
Dependent Claim
22 words
The apparatus of claim 3 further including a color filter means disposed between said liquid crystal means and said gain reflector means.
Claim 7
Dependent Claim
16 words
The apparatus of claim 2 wherein said gain reflector means includes a pattern of fluorescent colors.
Claim 8
Dependent Claim
45 words
The apparatus of claim 2 wherein said gain reflector means comprises a plurality of similar units disposed in substantially contiguous relation, each unit including an emitting surface which is convex in a plane defined by first and second axes and concave in planes perpendicular thereto.
Claim 9
Dependent Claim
15 words
The apparatus of claim 2 wherein said gain reflector means comprises a roughened mirrored surface.
Claim 10
Dependent Claim
32 words
The apparatus of claim 2 wherein said liquid crystal means has electrode means formed at the opposite surfaces thereof for applying an electric field across said liquid crystal as the prescribed input.
Claim 11
Dependent Claim
28 words
The apparatus of claim 8 further comprising circuit means for providing electric energy to said electrode means to effect application of the electric field to said liquid crystal.
Claim 12
Dependent Claim
30 words
The apparatus of claim 2 wherein said liquid crystal means and said gain reflector means present a curved surface to an illumination source on a viewing side of the display.
Claim 13
Dependent Claim
19 words
The apparatus of claim 10 utilized as part of a vehicle dashboard and further including a front lighting source.
Claim 14
Dependent Claim
10 words
The apparatus of claim 2 utilized in a vehicle dashboard.
Claim 15
Dependent Claim
21 words
The apparatus of claim 1 wherein said liquid crystal is a high birefringent material and said dye is a pleochroic dye.
Claim 16
Dependent Claim
45 words
The apparatus of claim 1 wherein said gain reflector means comprises a plurality of similar units disposed in substantially contiguous relation, each unit including an emitting surface which is concave in a plane defined by first and second axes and convex in planes perpendicular thereto.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |