Patent US5119221A successfully refreshed from Google Patents.
US5119221A
Expired / Lapsed
US
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Liquid crystal display device comprising improved alignment layers for liquid crystal
Assignee: Panasonic Holdings Corp
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Filing: 1989-07-12
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Granted: 1992-06-02
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Expires: 2009-07-12
Abstract
Abstract 37 A liquid crystal display device is provided which comprises a cell unit having a pair of optically transparent substrates each having an optically transparent electrode layer and an alignent layer for liquid crystal formed in this order on one side of the substrate. The paired substrates is in spaced relation with each other and is arranged such that the respective alignment layers are facing each other. A liquid crystal is contained in the space between the paired substrates. The alignment layers are made of a polymer material having both a ring structure and a substituted group at side chains thereof and are subjected to rubbing treatment. The use of the alignment layers ensures a great pretilt angle for liquid crystal molecules.
Inventors
- 👤 Keizo Nakajima
- 👤 Shigehiro Sato
- 👤 Hirofumi Wakemoto
- 👤 Shoichi Ishihara
- 👤 Yoshihiro Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:30
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
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
140 words
A liquid crystal display device which comprises a cell unit having a pair of optically transparent substrates each having an optically transparent electrode layer and an alignment layer for liquid crystal formed in this order on one side of the substrate, the paired substrates being in spaced relation with each other and arranged such that the respective alignment layers are facing each other, and a liquid crystal contained in the space between the paired substrate, said alignment layers being made of a polymer material having both a ring structure and a substituted group at side chains thereof in such a way that said ring structure is directly joined to a main chain of the polymer, wherein the ring is an aromatic ring structure, an alicyclic structure, a heterocyclic structure or a condensed ring structure, and being subject to rubbing treatment.
Claim 2
Dependent Claim
140 words
A liquid crystal display device which comprises a cell unit having a pair of optically transparent substrates each having an optically transparent electrode layer and an alignment layer for liquid crystal formed in this order on one side of the substrate, the paired substrates being in spaced relation with each other and arranged such that the respective alignment layers are facing each other, and a liquid crystal contained in the space between the paired substrate, said alignment layers being made of a polymer material having both a ring structure and a substituted group at side chains thereof in such a way that said ring structure is directly joined to a main chain of the polymer, wherein the ring is an aromatic ring structure, an alicyclic structure, a heterocyclic structure or a condensed ring structure, and being subject to rubbing treatment.
Claim 3
Dependent Claim
60 words
The liquid crystal display device according to claim 1, wherein said substituted group is at least one member selected from the group consisting of F, Cl, Br, I, CN, NO 2 , NH 2 , OH, CHO, COOH, OR, R, COR and COOR wherein each R is a linear or branched alkyl group having from 1 to 10 carbon atoms.
Claim 4
Dependent Claim
22 words
The liquid crystal display device according to claim 2, wherein said substituted group is attached to the ring structure at side chains.
Claim 5
Dependent Claim
18 words
The liquid crystal display device according to claim 2, wherein said substituted group is an electron acceptive group.
Claim 6
Dependent Claim
35 words
The liquid crystal display device according to claim 1, wherein said polymer material has a ring structure which is directly attached to a main chain of said polymer material and which has the substituted group.
Claim 7
Dependent Claim
20 words
The liquid crystal display device according to claim 5, wherein said polymer material is a homopolymer of a styrene derivative.
Claim 8
Dependent Claim
15 words
The liquid crystal display device according to claim 6, wherein said styrene derivative is chlorostyrene.
Claim 9
Dependent Claim
17 words
The liquid crystal display device according to claim 6, wherein said homopolymer is a nitrated styrene polymer.
Claim 10
Dependent Claim
25 words
The liquid crystal display device according to claim 8, wherein said nitrated styrene polymer has not less than 0.8 nitro groups per unit benzene group.
Claim 11
Dependent Claim
24 words
The liquid crystal display device according to claim 5, wherein said polymer material is a copolymer of a styrene derivative and a copolymerizable monomer.
Claim 12
Dependent Claim
30 words
The liquid crystal display device according to claim 10, wherein said copolymer is a copolymer of chlorostyrene and styrene having a content of chlorostyrene not less than 20 wt %.
Claim 13
Dependent Claim
36 words
The liquid crystal display device according to claim 5, wherein said polymer material is a polymer blend of a homopolymer of a styrene derivative and a polymer with or without any ring structure and substituted group.
Claim 14
Dependent Claim
31 words
The liquid crystal display device according to claim 12, wherein said homopolymer of the styrene derivative is contained in an amount of not less than 20 wt % of the polymer.
Claim 15
Dependent Claim
18 words
The liquid crystal display device according to claim 1, wherein said liquid crystal is a nematic liquid crystal.
Claim 16
Dependent Claim
18 words
The liquid crystal display device according to claim 1, wherein said liquid crystal is a ferrodielectric liquid crystal.
Claim 17
Dependent Claim
36 words
The liquid crystal display device according to claim 5, wherein said polymer material is a polymer blend of a copolymer of a styrene derivative and a polymer with or without any ring structure and substituted group.
Claim 18
Dependent Claim
31 words
The liquid crystal display device according to claim 16, wherein said copolymer of the styrene derivative is contained in an amount of not less than 20 wt % of the polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |