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US4844597A
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US
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Liquid crystal device utilizing chiral-smectic and nematic phases for thinner crystal layers
Assignee: Canon Inc
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Filing: 1988-07-20
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Granted: 1989-07-04
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Expires: 2008-07-20
Abstract
Abstract A liquid crystal device comprising a pair of base plates and a liquid crystal composition interposed between the pair of base plates; the liquid crystal composition comprising a liquid crystal compound showing at least chiral smectic phase and a liquid crystal showing at least nematic phase and having a pyrimidine skeleton; a face of at least one of the pair of base plates having been provided with a function of preferentially orienting the axes of the liquid crystal molecules contacting the face in one direction.
Inventors
- 👤 Kazuharu Katagiri
- 👤 Kazuo Yoshinaga
- 👤 Shinjiro Okada
- 👤 Junichiro Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:52
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
108 words
A liquid crystal device comprising a pair of base plates and a chiral smectic liquid crystal composition interposed between the pair of base plates; said chiral smectic liquid crystal composition comprising (i) a liquid crystal compound showing at least chiral smectic phase, and (ii) a liquid crystal compound having a pyrimidine skeleton and showing at least nematic phase; said chiral smectic liquid crystal composition being disposed in a layer thin enough to release the spiral structure of its chiral smectic phase; a face of at least one of said pair of base plates preferentially orienting the axes of the liquid crystal molecules contacting the face in one direction.
Claim 2
Dependent Claim
108 words
A liquid crystal device comprising a pair of base plates and a chiral smectic liquid crystal composition interposed between the pair of base plates; said chiral smectic liquid crystal composition comprising (i) a liquid crystal compound showing at least chiral smectic phase, and (ii) a liquid crystal compound having a pyrimidine skeleton and showing at least nematic phase; said chiral smectic liquid crystal composition being disposed in a layer thin enough to release the spiral structure of its chiral smectic phase; a face of at least one of said pair of base plates preferentially orienting the axes of the liquid crystal molecules contacting the face in one direction.
Claim 3
Dependent Claim
28 words
The liquid crystal device according to claim 1, wherein said liquid crystal composition is one causing successive phase transition of from smectic A phase to chiral smectic phase.
Claim 4
Dependent Claim
25 words
The liquid crystal device according to claim 2, wherein said chiral smectic phase is C phase, H phase, F phase, I phase or G phase.
Claim 5
Dependent Claim
47 words
The liquid crystal device according to claim 1, wherein said liquid crystal compound showing chiral smectic phase is one causing phase transition of isotropic phase, smectic A phase, and chiral smectic C phase, H phase, I phase or G phase, in the order named, on temperature decrease.
Claim 6
Dependent Claim
51 words
The liquid crystal device according to claim 1, wherein said liquid crystal compound showing chiral smectic phase is one causing phase transition of isotropic phase, cholesteric phase, smectic A phase, and chiral smectic C phase, H phase, I phase, F phase or G phase, in the order named, on temperature decrease.
Claim 7
Dependent Claim
48 words
The liquid crystal device according to claim 1, wherein said liquid crystal compound showing chiral smectic phase is one causing phase transition of isotropic phase, cholesteric phase, and chiral smectic C phase, H phase, I phase, F phase or G phase, in the order named, on temperature decrease.
Claim 8
Dependent Claim
47 words
The liquid crystal device according to claim 1, wherein one of the pair of base plates has a face having the function of preferentially orienting the axes of the liquid crystal molecules in one direction, and the other does not have such a face having the function.
Claim 9
Dependent Claim
35 words
The liquid crystal device according to claim 1, wherein the function of preferentially orienting the axes of the liquid crystal molecules in one direction has been provided by rubbing the face of a base plate.
Claim 10
Dependent Claim
30 words
The liquid crystal device according to claim 8, wherein said face of a base plate is formed by a film of an organic insulating material or an inorganic insulating material.
Claim 11
Dependent Claim
52 words
The liquid crystal device according to claim 9, wherein said organic insulating material is at least one resin selected from the group consisting of polyvinyl alcohol, polyimide, polyamide-imide, polyester-imide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, acrylic resin and a photoresist resin.
Claim 12
Dependent Claim
21 words
The liquid crystal device according to claim 9, wherein said inorganic insulating material is SiO, SiO 2 or TiO 2 .
Claim 13
Dependent Claim
55 words
The liquid crystal device according to claim 1, wherein the function of preferentially orienting the axes of the liquid crystal molecules in one direction has been provided to the face of a base plate by forming a film having the face on the base plate by the oblique vapor deposition of an inorganic insulating material.
Claim 14
Dependent Claim
19 words
The liquid crystal device according to claim 12, wherein said inorganic insulating material is SiO or SiO 2 .
Claim 15
Dependent Claim
45 words
The liquid crystal device according to claim 1, wherein the function of preferentially orienting the axes of the liquid crystal molecules in one direction has been provided to the face of a base plate by the oblique etching of a face of the base plate.
Claim 16
Dependent Claim
38 words
The liquid crystal device according to claim 14, wherein said face of a base plate is given by a film of an organic or inorganic insulating material formed on the base plate or the base plate per se.
Claim 17
Dependent Claim
52 words
The liquid crystal device according to claim 15, wherein said organic insulating material is at least one resin selected from the group consisting of polyvinyl alcohol, polyimide, polyamide-imide, polyester-imide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, acrylic resin and a photoresist resin.
Claim 18
Dependent Claim
22 words
The liquid crystal device according to claim 15, wherein said inorganic insulating material is glass, SiO, SiO 2 or TiO 2 .
Claim 19
Dependent Claim
43 words
The liquid crystal device according to claim 1, wherein said the other base plate is provided with a spacer member which has been provided by first forming a film of an insulating material and then etching the film except a selected portion thereof.
Claim 20
Dependent Claim
21 words
The liquid crystal device according to claim 18, wherein said spacer member is a member in the form of a stripe.
Claim 21
Dependent Claim
16 words
The liquid crystal device according to claim 19, wherein said spacer member is provided in plurality.
Claim 22
Dependent Claim
27 words
The liquid crystal device according to claim 1, wherein said liquid crystal compound having a pyrimidine skeleton and showing at least nematic phase also shows smectic phase.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |