Liquid crystal device

Details Liquid crystal device Liquid crystal device

1994-03-18

1996-04-23

Thomas, Alexander S.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

359 75, G02F 11337

Patent

active

055101593

ABSTRACT:
A liquid crystal device is constituted by a pair of substrates each provided with a transparent electrode, and a liquid crystal disposed between the substrates; at least one of said pair of substrates having thereon an alignment film comprising (i) a polyimide including principally a recurring unit of the following structural formula (I): ##STR1## wherein R.sub.11 denotes a tetravalent organic group, and R.sub.12 and R.sub.13 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms, and also at most 20 mol. % of a recurring monoamine unit of the following structural formula (II): ##STR2## wherein R.sub.21 and R.sub.22 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms, and X denotes an aromatic group, a heterocyclic group or a derivative group thereof; or (ii) a polyimide obtained through a reaction of at least two species of tetracarboxylic anhydrides of the following formula (III): ##STR3## wherein R.sub.31 denotes a tetravalent organic group, and a diamine of the following formula (IV): ##STR4## wherein R.sub.41 and R.sub.42 denote the same or different alkyl or perfluoroalkyl groups having 1-10 carbon atoms.

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: 4883344 (1989-11-01), Okada et al.
patent: 5129727 (1992-07-01), Hanyu et al.

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