Compositions – Liquid crystal compositions
Patent
1992-06-29
1995-03-28
Tucker, Philip
Compositions
Liquid crystal compositions
2522994, 359 75, 359 76, 359102, G02F 113, C09K 1952
Patent
active
RE0348856
ABSTRACT:
A liquid crystal display element comprising a pair of substrates, a pair of electrodes provided on the respective substrates, at least one of which is transparent and a liquid crystal layer disposed between said substrates, the liquid crystal layer comprising a nematic liquid crystal, which exhibits a positive dielectric constant anisotropy and contains an optically active substance, the liquid crystal moleccule orientation direction in the liquid crystal layer is twisted in the range of 200.degree. to 250.degree. from the one substrate surface toward the other substrate surface so as to form a helical structure therein. A polyimide orientation film is provided between the electrodes and the liquid crystal layer. The polyimide orientation film is one made of a polyimide prepared by reacting a diamine compound having a long-chain hydrocarbon group or a diamine compound having a trifluoromethyl group with a tetracarboxylic dianhydride and causes a pretilt angle of at least 3.degree. relative to the nematic liquid crystal molecules. The liquid crystal display element of the present invention is free from a scattering domain.
REFERENCES:
patent: 3994567 (1976-11-01), Matsuo
patent: 4146656 (1979-03-01), Kinugawa et al.
patent: 4494824 (1985-01-01), Nakamura
patent: 4664482 (1987-05-01), Kando et al.
Scheffer et al, Sid 1985 Digest of Technical Papers, pp. 120-123, (May 1985).
Field, P., Patent Abstracts of Japan Unexamined Applications, vol. 9, No. 64,177, Mar. 23-Jul. 23, 1985.
The Patent Office Japanese Government, p. 94, p. 343, Kokai No. 59-200219 (Hitachi) (Sharp).
Era Susumu
Fujisaki Kooji
Hanawa Yasuo
Iwasaki Kishiro
Kando Yasuhiko
Hitachi , Ltd.
Tucker Philip
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