US5436037A
Expired / Lapsed
US
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Liquid crystal orientation controlling membranes and liquid crystal elements using the same
Assignee: Showa Shell Sekiyu KK
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Filing: 1992-09-16
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Granted: 1995-07-25
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Expires: 2012-09-16
Abstract
Abstract A liquid crystal orientation controlling membrane, characterized by the polyimide membrane comprising the repeating unit represented by the formula: ##STR1## wherein Ar 1 represents a diamine moiety which is selected from the group consisting of ##STR2## Ar 2 represents tetravalent carboxylic acid moiety which is selected from the group consisting of ##STR3## Another invention is a ferroelectric liquid crystal element or an antiferroelectric liquid crystal element using the polyimide orientation controlling membrane mentioned above. The present liquid crystal element is used to a large picture display with high resolution, a TV picture display with wide viewing angle and a liquid crystal optical shutter.
Inventors
- 👤 Nobuhiro Okabe
- 👤 Yuvraj S. Negi
- 👤 Ichiro Kawamura
- 👤 Tohru Ohode
- 👤 Norio Yamamoto
- 👤 Yuichiro Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:18
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/0266; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C09K2323/00; C09K2323/02; C09K2323/027
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A ferroelectric liquid crystal element comprising a ferroelectric liquid crystal encapsulated between a pair of transparent electrode substrates, wherein an orientation controlling membrane is formed on the surfaces of said pair of substrates and is in contact with the ferroelectric liquid crystal and said orientation controlling membrane is constituted from the polyimide membrane comprising the repeating unit represented by the formula ##STR20## wherein Ar 1 represents a diamine moiety having the formula ##STR21## and Ar 2 represents the following tetravalent carboxylic acid moiety ##STR22##
Claim 2
Dependent Claim
84 words
A ferroelectric liquid crystal element comprising a ferroelectric liquid crystal encapsulated between a pair of transparent electrode substrates, wherein an orientation controlling membrane is formed on the surfaces of said pair of substrates and is in contact with the ferroelectric liquid crystal and said orientation controlling membrane is constituted from the polyimide membrane comprising the repeating unit represented by the formula ##STR20## wherein Ar 1 represents a diamine moiety having the formula ##STR21## and Ar 2 represents the following tetravalent carboxylic acid moiety ##STR22##
Claim 3
Dependent Claim
83 words
An antiferroelectric liquid crystal element comprising an antiferroelectric liquid crystal encapsulated between a pair of transparent electrode substrates, wherein an orientation controlling membrane is formed on the surface of said pair of substrates and is in contact with the antiferroelectric liquid crystal and said orientation controlling membrane is constituted from the polyimide membrane comprising the repeating unit represented by the formula: ##STR23## wherein Ar 1 represents a diamine moiety having the formula ##STR24## Ar 2 represents the following tetravalent carboxylic acid moiety ##STR25##
Claim 4
Dependent Claim
83 words
An antiferroelectric liquid crystal element comprising an antiferroelectric liquid crystal encapsulated between a pair of transparent electrode substrates, wherein an orientation controlling membrane is formed on the surface of said pair of substrates and is in contact with the antiferroelectric liquid crystal and said orientation controlling membrane is constituted from the polyimide membrane comprising the repeating unit represented by the formula: ##STR23## wherein Ar 1 represents a diamine moiety having the formula ##STR24## Ar 2 represents the following tetravalent carboxylic acid moiety ##STR25##
Claim 5
Dependent Claim
24 words
The antiferroelectric liquid crystal element of claim 2 wherein said antiferroelectric liquid crystal is selected from the group consisting of: (R),(S)-(-)-4-(1-methylheptyloxycarbonyl)phenyl-4-octyloxybiphenyl-4-carboxylate, (R),(+)-4-(1-trifluoromethylheptyloxycarbonyl)phenyl-4-octyloxybiphenyl-4-carboxylate, and (R),(+)-4-(1-trifluoromethylheptyloxycarbonyl)phenyl-4-decylbiphenyl-4-carboxylate.
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