Liquid crystal device

Details Liquid crystal device Liquid crystal device

1991-10-22

1993-10-05

Thomas, Alexander S.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

4284735, 359 75, 359 78, G02F 11337

Patent

active

052503305

ABSTRACT:
A liquid crystal device is formed by applying an alignment film comprising a polyimide which contains a structural unit represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a tetravalent organic residue group, R.sub.2 denotes a divalent organic residue group, X denotes --NHR.sub.3 or --OH, R.sub.3 denotes an alkyl group having 5-20 carbon atoms, Y denotes --NHR.sub.4 or --OH, and R.sub.4 denotes an alkyl group having 5-20 carbon atoms with the proviso that both X and Y cannot be --OH and the --OH in X or Y can be removed by further cyclization. The liquid crystal device thus formed shows a high contrast display, particularly by multiplexing drive, free from after-image because of quick responsiveness.

REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4561726 (1985-12-01), Goodby et al.
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 5046822 (1991-09-01), Matsuda et al.

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