US5046822A
Expired / Lapsed
US
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Liquid crystal device
Assignee: Canon Inc
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Filing: 1990-08-31
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Granted: 1991-09-10
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Expires: 2010-08-31
Abstract
Abstract The present invention provides a liquid crystal material disposed between said pair of substrates, wherein at least one of said substrates is provided with a film comprising a polyimide compound having in its polyimide main-chain structural unit at least one alkyl side chain containing an alkyl chain moiety having a length of 2 to 10 carbon atoms.
Inventors
- 👤 Hiroshi Matsuda
- 👤 Hisaaki Kawade
- 👤 Yuko Morikawa
- 👤 Toshiharu Uchimi
- 👤 Ken Eguchi
- 👤 Haruki Kawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; C08G73/1046; C08G73/1057; C08G73/1064; C08G73/1075; C08G73/1082; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027; C09K2323/0271; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A liquid crystal device comprising a pair of substrates and a liquid crystal material disposed between said pair of substrates, wherein at least one of said substrates is provided with a film comprising a polyimide compound having in its polyimide main-chain structural unit at least one alkyl side chain containing an alkyl chain moiety having a length of 2 to 10 carbon atoms.
Claim 2
Dependent Claim
63 words
A liquid crystal device comprising a pair of substrates and a liquid crystal material disposed between said pair of substrates, wherein at least one of said substrates is provided with a film comprising a polyimide compound having in its polyimide main-chain structural unit at least one alkyl side chain containing an alkyl chain moiety having a length of 2 to 10 carbon atoms.
Claim 3
Dependent Claim
16 words
A liquid crystal device according to claim 1, wherein said alkyl chain is a straight-alkyl chain.
Claim 4
Dependent Claim
23 words
A liquid crystal device according to claim 1, wherein said polyimide film is a monomolecular film or a built-up film of monomolecular films.
Claim 5
Dependent Claim
18 words
A liquid crystal device according to claim 1, wherein said liquid crystal material is a ferroelectric liquid crystal.
Claim 6
Dependent Claim
53 words
A liquid crystal device according to claim 1, wherein said polyimide film comprising said polyimide compound is a film obtained by imidation of a polyamide acid synthesized by condensation reaction of a carboxylic anhydride with a diamine, at least one of said carboxylic anhydride or said diamine is substituted with an alkyl group.
Claim 7
Dependent Claim
183 words
A liquid crystal device according to claim 5, wherein said carboxylic anhydride or a diamine at least one of which is substituted with an alkyl group is selected from the group consisting of: ##STR22## ##STR23## wherein m and n each represent an integer of 0, 1 to 3; R is selected from the groups consisting of: normal--C l H 2l+1 --, l=an integer of 2 to 10; normal--C l H 2l+1 CO--, l=an integer of 2 to 10; normal--C l H 2l+1 O--, l=an integer of 2 to 10; normal CF 3 (CF 2 ) k (CH 2 ) l --, l+k=an integer of 2 to 10 and k=2, 3 or 5; normal CF 3 (CF 2 ) k (CH 2 ) l CO--, l+k=an integer of 2 to 10 and k=2, 3 or 5; (CF 3 ) 2 CF(CH 2 ) l --, l=an integer of 0, 1 to 8; or (CF 3 ) 2 CF(CH 2 ) l CO--, l=an integer of 0, 1 to 8 and R can be combined with different two or more kinds of the group thereof.
Claim 8
Dependent Claim
23 words
A liquid crystal device according to claim 1, wherein said polyimide film has a film thickness of from 10 Å to 1 μm.
Claim 9
Dependent Claim
23 words
A liquid crystal device according to claim 1, wherein said polyimide film has a film thickness of from 30 Å to 2,000 Å.
Claim 10
Dependent Claim
23 words
A liquid crystal device according to claim 1, wherein said polyimide film has a film thickness of from 30 Å to 300 Å.
Claim 11
Dependent Claim
21 words
A method of driving a liquid crystal device, comprising bringing the liquid crystal device according to claim 1 into multiplexing drive.
Claim 12
Dependent Claim
28 words
A method of driving a liquid crystal device according to claim 10, wherein said polyamide film is a monomolecular film or a built-up film of PG,67 monomolecular films.
Claim 13
Dependent Claim
22 words
A method of driving a liquid crystal device according to claim 10, wherein said liquid crystal material comprises a ferroelectric liquid crystal.
Claim 14
Dependent Claim
53 words
A method of driving a liquid crystal device according to claim 10, wherein said polyimide film comprising said polyimide compound is a film obtained by imidation of a polyamide acid synthesized by condensation reaction of a carboxylic anhydride with a diamine at least one of which has been substituted with an alkyl group.
Claim 15
Dependent Claim
190 words
A method of driving a liquid crystal device according to claim 13, wherein said carboxylic anhydride or a diamine at least one of which has been substituted with an alkyl group is selected from the group consisting of: ##STR24## ##STR25## wherein m and n each represent an integer of 0, 1 to 3; R is selected from the group consisting of: normal--C l H 2l+1 --, l=an integer of 2 to 10; normal--C l H 2l+1 CO--, l=an integer of 2 to 10; normal--C l H 2l +1O--, l=an integer of 2 to 10; normal CF 3 (CF 2 ) k (CH 2 ) l --, l+k =an integer of 2 to 10 and k=2, 3 or 5; normal CF 3 (CF 2 ) k (CH 2 ) l CO--, l+k =an integer of 2 to 10 and k=2, 3 or 5; (CF 3 ) 2 CF(CH 2 ) l --, l=an integer of 0, 1 to 8; or (CF 3 ) 2 CF(CH 2 ) l CO--, l=an integer of 0, 1 to 8 and R can be combined with different two or more kinds of the group thereof.
Claim 16
Dependent Claim
23 words
A liquid crystal device according to claim 10, wherein said polyimide film has a film thickness of from 10 Å to 1 μm.
Claim 17
Dependent Claim
27 words
A method of driving a liquid crystal device according to claim 10, wherein said polyimide film has a film thickness of from 30 Å to 2,000 Å.
Claim 18
Dependent Claim
27 words
A method of driving a liquid crystal device according to claim 10, wherein said polyimide film has a film thickness of from 30 Å to 300 Å.
References Cited (Backward Citations)
US4781439A
Cited
EP0365855A1
Cited
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