US3973057A
Expired / Lapsed
US
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Method of preparing a liquid crystal display
Assignee: RCA Corp
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Filing: 1975-03-07
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Granted: 1976-08-03
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Expires: 1995-03-07
Abstract
Abstract The inner surfaces of a pair of substrates of a liquid crystal display are treated with a solution of a surfactant to provide a uniform stable alignment of the liquid crystal material confined between the inner surfaces. The inner surfaces are first wetted by the soluton of the surfactant, a silane derivative, and the solution is then heated, while the inner surfaces are in contact with the solution, to a temperature between about 75°C and a temperature just below the boiling point of the solution.
Inventors
- 👤 Donald Jones Channin
- 👤 Eldon Bruce Priestley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; C09K2323/00; C09K2323/02; C09K2323/023; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A method of preparing a liquid crystal cell comprising a layer of difficultly alignable liquid crystal material between two spaced apart siliceous plates which comprises immersing said plates in a solution containing a silane derivative of the formula R n SiX 4-n wherein R is an organofunctional group which includes an alkyl, X is a hydrolyzable group attached to the silicon and n is an integer of 1-3 and water, heating said solution while said plates are immersed therein to a temperature between about 75° C. and a temperature just below the boiling point of said solution for at least 3 minutes, removing excess silane solution from said plates, drying said plates, and filling said cell with said liquid crystal material.
Claim 2
Independent Claim
121 words
A method of preparing a liquid crystal cell comprising a layer of difficultly alignable liquid crystal material between two spaced apart siliceous plates which comprises immersing said plates in a solution containing a silane derivative of the formula R n SiX 4-n wherein R is an organofunctional group which includes an alkyl, X is a hydrolyzable group attached to the silicon and n is an integer of 1-3 and water, heating said solution while said plates are immersed therein to a temperature between about 75° C. and a temperature just below the boiling point of said solution for at least 3 minutes, removing excess silane solution from said plates, drying said plates, and filling said cell with said liquid crystal material.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein said silane solution comprises 0.1 to 1.0% of said silane derivative in water.
Claim 4
Dependent Claim
47 words
A method according to claim 1 wherein one of said plates has a metallic inner surface and said silane solution comprises about 0.1 to 1.0% by volume of said silane derivative, about 2.0% by volume of water, and about 0.1% of acetic acid in acetone or dimethylformamide.
Claim 5
Dependent Claim
33 words
A method according to claim 1 wherein said silane has the formula ##STR5##wherein R and R' are alkyl groups of 1-2 carbon atoms and R" is an alkyl group of 16-18 carbon atoms.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |