Compounds and methods for doping liquid crystal hosts

Details Compounds and methods for doping liquid crystal hosts Compounds and methods for doping liquid crystal hosts

1998-02-06

1999-11-23

Wu, Shean

Compositions

Liquid crystal compositions

Containing pleochroic dye

2522992, 252582585, 349196, 549 53, 549 54, 549 55, 549 56, C09K 1960, G02F 1137, C07D33364, F21V 914

Patent

active

059894512

ABSTRACT:
This invention provides chiral thioindigo compounds for doping smectic liquid crystal hosts, wherein the compounds modulate a chiral bulk property of an induced chiral smectic liquid crystal phase upon irradiation at a wavelength in the visible range. Modulation of the chiral bulk property is effected by reversible trans-cis photoisomerization of the compound upon irradiation. The compounds maintain their rod-like shape in both isomeric forms, and hence do not destabilize the chiral smectic liquid crystal phase. Compounds according to the invention are useful in optical devices such as optical switches, displays, and memory.

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