Patent US3963324A successfully refreshed from Google Patents.
US3963324A
Expired / Lapsed
US
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Liquid crystal display assembly
Assignee: Hoffmann La Roche Inc
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Filing: 1973-09-10
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Granted: 1976-06-15
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Expires: 1993-09-10
Abstract
Abstract An improved assembly for a liquid crystal display of the polarized light shutter type is obtained by applying to the facing surfaces of transparent parallel plates, between which a layer of liquid crystal material is disposed, a material selected from the group consisting of water soluble polymers and polyvinyl acetal resins which facilitate unidirectional rubbing of the facing surfaces of the plates to produce a twisted nematic structure.
Inventors
- 👤 James L. Fergason
- 👤 Duane E. Werth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:02
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/05; C09K2323/057
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
In a liquid crystal display, the combination of a pair of transparent parallel plates, areas of transparent conductive material on the facing surfaces of said transparent parallel plates, a layer of a water soluble organic polymer selected from the group consisting of polyvinyl alcohol, polyethylene oxide, and polyvinyl pyrrolidone deposited over said transparent conductive material which will facilitate the production of well-defined lines produced upon rubbing, the transparent conductive areas with said material thereon being rubbed unidirectionally, a layer of liquid crystal material between said transparent conductive areas whereby a twisted nematic structure will be produced in the liquid crystal material by virtue of said unidirectional rubbing, polarizers on the sides of said transparent plates opposite said liquid crystal material, and means for establishing an electrical field between said transparent conductive areas.
Claim 2
Dependent Claim
132 words
In a liquid crystal display, the combination of a pair of transparent parallel plates, areas of transparent conductive material on the facing surfaces of said transparent parallel plates, a layer of a water soluble organic polymer selected from the group consisting of polyvinyl alcohol, polyethylene oxide, and polyvinyl pyrrolidone deposited over said transparent conductive material which will facilitate the production of well-defined lines produced upon rubbing, the transparent conductive areas with said material thereon being rubbed unidirectionally, a layer of liquid crystal material between said transparent conductive areas whereby a twisted nematic structure will be produced in the liquid crystal material by virtue of said unidirectional rubbing, polarizers on the sides of said transparent plates opposite said liquid crystal material, and means for establishing an electrical field between said transparent conductive areas.
Claim 3
Dependent Claim
120 words
In a liquid crystal display, the combination of a pair of transparent parallel plates, areas of transparent conductive material on the facing surfaces of said transparent parallel plates, a layer of material deposited over said transparent conductive material comprising a polyvinyl acetal resin which will facilitate the production of well-defined lines produced upon rubbing, the transparent conductive areas with said material thereon being rubbed unidirectionally, a layer of liquid crystal material between said transparent conductive areas whereby a twisted nematic structure will be produced in the liquid crystal material by virtue of said unidirectional rubbing, polarizers on the sides of said transparent plates opposite said liquid crystal material, and means for establishing an electrical field between said transparent conductive areas.
Claim 4
Dependent Claim
120 words
In a liquid crystal display, the combination of a pair of transparent parallel plates, areas of transparent conductive material on the facing surfaces of said transparent parallel plates, a layer of material deposited over said transparent conductive material comprising a polyvinyl acetal resin which will facilitate the production of well-defined lines produced upon rubbing, the transparent conductive areas with said material thereon being rubbed unidirectionally, a layer of liquid crystal material between said transparent conductive areas whereby a twisted nematic structure will be produced in the liquid crystal material by virtue of said unidirectional rubbing, polarizers on the sides of said transparent plates opposite said liquid crystal material, and means for establishing an electrical field between said transparent conductive areas.
Claim 5
Dependent Claim
26 words
The liquid crystal display of claim 2 wherein said resin is selected from the group consisting of polyvinyl butyral, polyvinyl formal, polyvinyl glyoxal and polyvinyl glutral.
References Cited (Backward Citations)
US3731987A
Cited
US3700306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |