Compositions – Liquid crystal compositions – Containing nonchiral aligning agents
Patent
1998-05-18
1999-09-28
Kelly, C H
Compositions
Liquid crystal compositions
Containing nonchiral aligning agents
428 1, 4284735, 349191, C09K 1956, C09K 1900, B32B 2700, G02F 11337
Patent
active
059582936
ABSTRACT:
A process for inducing alignment of a liquid crystal medium adjacent to a surface of an optical alignment layer comprising: exposing at least one optical alignment layer to polarized light; the polarized light having a wavelength within the absorption band of said optical alignment layer; wherein the exposed alignment layer induces alignment of the liquid crystal medium at an angle + and -.theta. with respect to the direction of the polarization of the incident light beam and along the surface of the optical alignment layer; and applying a liquid crystal medium to the optical alignment layer, wherein the optical alignment layer is a polyimide comprising an an amine component having a 2-substituted 1,4-benzenediamine wherein the 2-substituent X.sub.1 is an electron withdrawing group having a positive .sigma.. Also claimed is a liquid crystal display element made by the process.
REFERENCES:
patent: 4974941 (1990-12-01), Gibbons et al.
patent: 5032009 (1991-07-01), Gibbons et al.
patent: 5731405 (1998-03-01), Gibbons et al.
Gibbons Wayne M.
Shannon Paul Joseph
Zheng Hanxing
Elsicon Inc.
Kelly C H
Shannon Paul J.
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