US5523871A
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US
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Liquid crystal device having a uniaxial alignment polymer film with at least two species of dopants
Assignee: Canon Inc
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Filing: 1994-06-03
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Granted: 1996-06-04
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Expires: 2014-06-03
Abstract
Abstract A liquid crystal device is constituted by a pair of substrates each having thereon an electrode and a uniaxial alignment film, and a chiral smectic liquid crystal disposed between the substrates. At least one of the uniaxial alignment films is a film comprising an electroconductive polymer doped with at least two species of dopants, which preferably include a first type dopant capable of dedoping into the liquid crystal due to electric field application or diffusion, and a second type dopant substantially incapable of dedoping into the liquid crystal. The resultant liquid crystal device is alleviated with respect to voltage hysteresis and is suitable for gradational display.
Inventors
- 👤 Masaaki Shibata
- 👤 Etsuro Kishi
- 👤 Satoshi Yuasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G02F1/1418; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F2202/00; G02F2202/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A liquid crystal device, comprising: a pair of substrates each having thereon an electrode and a uniaxial alignment film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the uniaxial alignment films is a film comprising an electroconductive polymer doped with at least two species of dopants, and wherein said at least two species of dopants include a first type dopant capable of dedoping into the liquid crystal due to electric field application or diffusion, and a second type dopant substantially incapable of dedoping into the crystal.
Claim 2
Dependent Claim
93 words
A liquid crystal device, comprising: a pair of substrates each having thereon an electrode and a uniaxial alignment film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the uniaxial alignment films is a film comprising an electroconductive polymer doped with at least two species of dopants, and wherein said at least two species of dopants include a first type dopant capable of dedoping into the liquid crystal due to electric field application or diffusion, and a second type dopant substantially incapable of dedoping into the crystal.
Claim 3
Dependent Claim
36 words
A liquid crystal device according to claim 1, wherein the doping of the electroconductive film is performed by a mixture of the electroconductive polymer and another polymer, doped with said at least two species of dopants.
Claim 4
Dependent Claim
115 words
A liquid crystal device comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with a first type dopant and a second type dopant, wherein the first type dopant comprises a member selected from the Group constituting off H 2 SO 4 , HC1, HNO 3 , CH 3 COOH, halogen, Lewis acid, and organic acid derivative, and the second type dopant comprises a member selected from the group consisting of polystyrenesulfonic acid, polyvinylsulfonic acid, cellulose sulfate, polyacrylic acid, polymaleic anhydride and organic acid derivative.
Claim 5
Dependent Claim
115 words
A liquid crystal device comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with a first type dopant and a second type dopant, wherein the first type dopant comprises a member selected from the Group constituting off H 2 SO 4 , HC1, HNO 3 , CH 3 COOH, halogen, Lewis acid, and organic acid derivative, and the second type dopant comprises a member selected from the group consisting of polystyrenesulfonic acid, polyvinylsulfonic acid, cellulose sulfate, polyacrylic acid, polymaleic anhydride and organic acid derivative.
Claim 6
Dependent Claim
22 words
A liquid crystal device according to claim 3, wherein the organic acid derivative comprises an organic acid salt of phthalocyanine or porphyrin.
Claim 7
Dependent Claim
101 words
A liquid crystal device, comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein an least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with at least two species of dopants, and said at Least two species of dopants include a first type dopant capable of dedoping into the liquid crystal due to electric field application or diffusion, and a second type dopant which is substantially incapable of dedoping into the liquid crystal and enhances the electroconductivity of the electroconductive polymer.
Claim 8
Dependent Claim
101 words
A liquid crystal device, comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein an least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with at least two species of dopants, and said at Least two species of dopants include a first type dopant capable of dedoping into the liquid crystal due to electric field application or diffusion, and a second type dopant which is substantially incapable of dedoping into the liquid crystal and enhances the electroconductivity of the electroconductive polymer.
Claim 9
Dependent Claim
119 words
A liquid crystal device comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with a first type dopant and a second type dopant, said electroconductive polymer comprises polyaniline, the first type dopant comprises a member selected from the group consisting of H 2 SO 4 , HCl, HNO 3 , CH 3 COOH, halogen, Lewis acid, and organic acid derivative; and the second type dopant comprises a member selected from the group consisting of polystyrenesulfonic acid, polyvinylsulfonic acid, cellulose sulfate, polyacrylic acid, polymaleic anhydride and organic acid derivative.
Claim 10
Dependent Claim
119 words
A liquid crystal device comprising: a pair of substrates each having thereon an electrode and a film, and a chiral smectic liquid crystal disposed between the substrates, wherein at least one of the films is a uniaxial alignment film comprising an electroconductive polymer doped with a first type dopant and a second type dopant, said electroconductive polymer comprises polyaniline, the first type dopant comprises a member selected from the group consisting of H 2 SO 4 , HCl, HNO 3 , CH 3 COOH, halogen, Lewis acid, and organic acid derivative; and the second type dopant comprises a member selected from the group consisting of polystyrenesulfonic acid, polyvinylsulfonic acid, cellulose sulfate, polyacrylic acid, polymaleic anhydride and organic acid derivative.
Claim 11
Dependent Claim
30 words
A liquid crystal device according to any one of claims 1, 3, 5 or 6, wherein said uniaxial alignment film comprises a mixture of said electroconductive polymer and another polymer.
Claim 12
Dependent Claim
38 words
A liquid crystal device according to any one of claims 1, 2, 3, 5 or 6, wherein said liquid crystal is a liquid crystal causing a phase transition from isotropic phase to smectic A phase on temperature decrease.
Claim 13
Dependent Claim
26 words
A liquid crystal device according to any one of claims 1, 2, 3, 5 or 6, wherein said uniaxial alignment film has been subjected to rubbing.
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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) | 1999-06-04 | 1999-12-04 | 2000-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-04 | 2003-12-04 | 2004-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-04 | 2007-12-04 | 2008-06-04 | $7700.00 | Window Closed / Lapsed |