US4472028A
Expired / Lapsed
US
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Organosilicone homeotropic alignment layer with OH group
Assignee: Hitachi Ltd
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Filing: 1981-10-05
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Granted: 1984-09-18
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Expires: 2001-10-05
Abstract
Abstract A liquid crystal display device comprising two substrates being provided in parallel to each other at a given distance and each having a Nesa film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates each being coated with polymer of organosilicone compound having groups reacting with the substrates to a thickness of 300-1,500 ANGSTROM as an alignment film. The device has thick alignment films and good electrooptical characteristics.
Inventors
- 👤 Michio Ooue
- 👤 Kishiro Iwasaki
- 👤 Hiroaki Hachino
- 👤 Mitsuru Ura
- 👤 Ryoichi Sudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
100 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates each being coated with polymer of organosilicone compound having groups reacting with the substrates, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, the polymer coating having a thickness of 300-1,500 Å, said polymer forming a homeotropic alignment film.
Claim 2
Dependent Claim
100 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates each being coated with polymer of organosilicone compound having groups reacting with the substrates, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, the polymer coating having a thickness of 300-1,500 Å, said polymer forming a homeotropic alignment film.
Claim 3
Dependent Claim
54 words
The liquid crystal display device according to claim 1, wherein the organosilicone compound having OH groups is an alkylsilanol polymer having repetitive units of the following general formula: ##STR13## wherein X, Y and Z are OH groups, alkyl groups and haloalkyl groups, and are alkyl group and haloalkyl group at least at the terminals.
Claim 4
Dependent Claim
25 words
The liquid crystal display device according to claim 2, wherein the alkylsilanol polymer is at least one of alkylsilanol polymer, haloalkylsilanol polymer and haloalkylsilanol polymer.
Claim 5
Dependent Claim
22 words
The liquid crystal display device according to claim 1, 2, or 3, wherein the alignment film has a thickness of 500-1,000 Å.
Claim 6
Dependent Claim
113 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film on the counterposed surface of the substrate to a thickness of 300-1,500 Å.
Claim 7
Dependent Claim
113 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film on the counterposed surface of the substrate to a thickness of 300-1,500 Å.
Claim 8
Dependent Claim
117 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and a viscosity-increasing polymer and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film on the counterposed surface of the substrate to a thickness of 300-1,500 Å.
Claim 9
Dependent Claim
117 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and a viscosity-increasing polymer and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film on the counterposed surface of the substrate to a thickness of 300-1,500 Å.
Claim 10
Dependent Claim
23 words
The liquid crystal display device according to claim 6, wherein the viscosity-increasing polymer is nitrocellulose, ethylcellulose, acetocellulose, propylcellulose, hydroxypropylcellulose, acrylic resin or polyimide.
Claim 11
Dependent Claim
131 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and a refractive index-improving and viscosity-increasing polymer and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film, with a refractive index approaching that of the transparent electroconductive film on the counterposed surface of the substrate, to a thickness of 300-1,500 Å.
Claim 12
Dependent Claim
131 words
A liquid crystal display device which comprises two substrates being provided in parallel to each other at a given distance and each having a transparent electroconductive film on the counterposed surface, at least one of the substrates being transparent, and a liquid crystal being filled between the substrates, the counterposed surfaces of the substrates being coated with a solution in an organic solvent of oligomer of organosilicone compound having groups reacting with the substrates and a refractive index-improving and viscosity-increasing polymer and heated for condensation, said organosilicone compound having groups reacting with the substrates being an organosilicone compound having OH groups, thereby forming a homeotropic alignment film, with a refractive index approaching that of the transparent electroconductive film on the counterposed surface of the substrate, to a thickness of 300-1,500 Å.
Claim 13
Dependent Claim
37 words
The liquid crystal display device according to claim 5, 6, 7 or 8, wherein the oligomer of organosilicone compound having groups reacting with the substrate is at least one of alkylsilanol oligomer, haloalkylsilanol oligomer, and haloalkylalkylsilanol oligomer.
Claim 14
Dependent Claim
23 words
The liquid crystal display device according to claim 5, 6, 7, or 8, wherein the alignment film has a thickness of 500-1,000 Å.
Claim 15
Dependent Claim
19 words
The liquid crystal display device according to claim 9, wherein the alignment film has a thickness of 500-1,000 Å.
Claim 16
Dependent Claim
28 words
The liquid crystal display device according to claim 9, wherein the alkyl and haloalkyl groups of the alkylsilanol oligomer, haloalkylsilanol oligomer and haloalkylalkylsilanol oligomer have 3-18 carbon atoms.
Claim 17
Dependent Claim
17 words
The liquid display device according to claim 8, wherein said refractive index-improving and viscosity-increasing polymer is polyimide.
Claim 18
Dependent Claim
16 words
The liquid crystal display device according to claim 13, wherein said oligomer is an alkylsilanol oligomer.
Claim 19
Dependent Claim
27 words
The liquid crystal display device according to claim 1, 5, 6, 8 or 14, wherein said transparent electroconductive film is made of a material including indium oxide.
Claim 20
Dependent Claim
20 words
The liquid crystal display device according to claim 15, wherein said transparent electroconductive film is an indium oxide-tin oxide film.
Claim 21
Dependent Claim
22 words
The liquid crystal display device according to claim 5, 6 or 8, wherein said solution has a pH of 7 or less.
Claim 22
Dependent Claim
22 words
The liquid crystal display device according to claim 5, 6 or 8, wherein the heating for condensation is performed at 180°-450° C.
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |