Ferroelectric liquid crystal cell with rubbed polyimide alignmen

Details Ferroelectric liquid crystal cell with rubbed polyimide alignmen Ferroelectric liquid crystal cell with rubbed polyimide alignmen

1984-05-01

1987-01-06

Corbin, John K.

350350S, G02F 113

Patent

active

046342281

ABSTRACT:
Orientation control films are coated on a pair of transparent substrates on the side contiguous to the ferroelectric liquid crystal layer and rubbed for aligning molecules thereof. The films are made of a polyimide polymer prepared by ring closure by heating and dehydrating of a polyamic acid which is synthesized by condensing, for example, pyromellitic dianhydride with 4,4'-diaminoterphenyl. A contrast ratio of the ferroelectric liquid crystal element is improved while keeping a high response characteristic of the ferroelectric liquid crystal materials.

REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4381886 (1983-05-01), Yokokura et al.
patent: 4561726 (1985-12-01), Goodby et al.
Meyer, R. B., et al., "Ferroelectric Liquid Crystals," Supplement au J. de Physique, Tome 36, No. 3, Mar. 1975, pp. 69-71.
Clark, N. A., et al., "Submicrosecond Bistable Electrooptic Switching in Liquid Crystals," Appl. Phys. Lett., vol. 36, No. 11, Jun. 1980, pp. 899-901.

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