Antiparallel aligned nematic liquid crystal device with positive dielectric anisotropy
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorToshimitsu Konuma
Life of this patent
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Abstract
A liquid-crystal electro-optical device is offered which can operate at high speeds and easily oriented. The value of the surface tension of liquid crystal-orienting layers is 40 dynes/cm or more, and these layers are rubbed in antiparallel directions to each other. This reduces the pretilt angle of the molecules of a nematic liquid crystal sandwiched between two substrates. The anisotropy of the dielectric constant of the nematic liquid crystal is positive. The interval between the substrates is 5 .mu.m or less.
Claims18
An electro-optical device comprising:
- an electro-optical modulating layer provided between a pair of substrates, comprising a nematic liquid crystal having a positive dielectric anisotropy, said liquid crystal composed of molecules aligned substantially in one direction throughout a thickness of the liquid crystal;
- and
- a pair of orientation films provided on said pair of substrates respectively and having subjected thereto rubbing treatments in antiparallel directions to each other,
- wherein a molecule of said nematic liquid crystal has a pre-tilt angle of 4.degree. or less and an interval between said substrates is 5 .mu.m or less.
An electro-optical device comprising:
- an electro-optical modulating layer provided between a pair of substrates, comprising a nematic liquid crystal having a positive dielectric anisotropy, said liquid crystal composed of molecules aligned substantially in one direction throughout a thickness of the liquid crystal;
- and
- a pair of orientation films provided on said pair of substrates respectively and having subjected thereto rubbing treatments in antiparallel directions to each other,
- wherein said orientation films have a polar component of a surface tension in the range of 10 dyne/cm or more and an interval between said substrates is 5 .mu.m or less.
An electro-optical device comprising:
- an electro-optical modulating layer provided between a pair of substrates, comprising a nematic liquid crystal having a positive dielectric anisotropy, said liquid crystal composed of molecules aligned substantially in one direction throughout a thickness of the liquid crystal;
- and
- a pair of orientation films provided on said pair of substrates respectively and having subjected thereto rubbing treatments in antiparallel directions to each other,
- wherein said orientation films have a surface tension in the range of 40 dyne/cm or more and an interval between said substrates is 5 .mu.m or less.
An electro-optical device comprising:
- an electro-optical modulating layer provided between a pair of substrates, comprising a nematic liquid crystal having a positive dielectric anisotropy, said liquid crystal composed of molecules aligned substantially in one direction throughout a thickness of the liquid crystal;
- and
- a pair of orientation films provided on said pair of substrates respectively and having subjected thereto rubbing treatments in antiparallel directions to each other,
- wherein an interval between said substrates is 5 .mu.m or less, said orientation films have a surface tension in the range of 40 dyne/cm or more with a polar component of said surface tension in the range of 10 dyne/cm or more, and wherein a molecule of said nematic liquid crystal has a pre-tilt angle of 4.degree. or less.
Dependencies are inferred from the claim text.