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US4523812A
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Plastic liquid crystal devices with unequal substrate thicknesses
Assignee: Texas Instruments Inc
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Filing: 1982-11-23
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Granted: 1985-06-18
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Expires: 2002-11-23
Abstract
Abstract To avoid obtrusive interference colors in a liquid crystal device having birefringent substrates, the two substrates are selected to be of markedly unequal thicknesses.
Inventors
- 👤 Perry A. Penz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:50
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133305; G02F1/1335; G02F1/13363; G02F1/133635; G02F2413/00; G02F2413/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A liquid crystal device comprising: first and second substrates each comprising a birefringent material; first and second conductor layers, said conductor layers respectively being disposed on respective innerfaces of said respective substrates; first and second alignment layers respectively disposed on said first and second conductor layers; perimeter seal means interposed between said first and second substrates and sealing the perimeters thereof together to define a cavity between said first and second substrates with said first and second conductor layers and said first and second alignment layers being disposed in respective opposing relationship with respect to each other; a liquid crystal material filling the cavity defined between said first and second substrates; and the respective thicknesses of said first and second substrates being of unequal magnitudes of a degree sufficient to prevent the appearance of obtrusive interference colors.
Claim 2
Dependent Claim
137 words
A liquid crystal device comprising: first and second substrates each comprising a birefringent material; first and second conductor layers, said conductor layers respectively being disposed on respective innerfaces of said respective substrates; first and second alignment layers respectively disposed on said first and second conductor layers; perimeter seal means interposed between said first and second substrates and sealing the perimeters thereof together to define a cavity between said first and second substrates with said first and second conductor layers and said first and second alignment layers being disposed in respective opposing relationship with respect to each other; a liquid crystal material filling the cavity defined between said first and second substrates; and the respective thicknesses of said first and second substrates being of unequal magnitudes of a degree sufficient to prevent the appearance of obtrusive interference colors.
Claim 3
Dependent Claim
21 words
The device of claim 1, wherein the respective thicknesses of said first and second substrates differ by more than 2 mils.
Claim 4
Dependent Claim
13 words
The device of claim 2, wherein both said substrates comprise a one-dimensionally-stretched polyester.
Claim 5
Dependent Claim
18 words
The device of claim 1, wherein said first and second substrates both consist of a uniaxial birefringent material.
Claim 6
Dependent Claim
16 words
The device of claim 4, wherein the respective optic axes of said substrates are mutually parallel.
Claim 7
Dependent Claim
13 words
The device of claim 4, wherein both said substrates comprise a one-dimensionally-stretched polymer.
Claim 8
Dependent Claim
13 words
The device of claim 1, wherein both said substrates comprise a one-dimensionally-stretched polyester.
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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |