Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

1995-10-02

1997-01-21

Caldarola, Glenn A.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

430 20, 428 1, 4284735, 349124, G02F 11337, C09K 1900, B32B 2700, B32B 2706

Patent

active

055964354

ABSTRACT:
A liquid crystal display device comprising a liquid crystal cell including a pair of substrates each having an alignment film on the surface thereof, and a liquid crystal filled in a space between the substrates, which is provided with a plurality of alignment regions, each region having the direction of alignment or the rise direction of liquid crystal molecule different from another region within a display region. The alignment film comprises a polyimide having a glass transition point of 300.degree. to 400.degree. C., a skeleton having no two-revolution axis, non-conjugated carbon occupying 10 to 60% of the total number of carbon excluding carbon atoms directly connected to imido group, a relative dielectric constant of 4 to 7 at a frequency of 1kH and at a temperature of 20.degree. C., or an imidization degree of not less than 90%, or a polyimide obtained by reacting tetracarboxylic acid di-anhydride with a di-amine compound, or a polyimide obtained by imidizing a polyimide, the tetracarboxylic acid di-anhydride moiety being prohibited of the free rotation thereof.

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