Class of dichroic dyes for use with liquid crystals
AssigneeElectronic Display Systems, Inc.
InventorDerick Jones
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Abstract
A cholesteric guest-host liquid crystal composition having a positive dielectric anisotropy and consisting of a positive nematic host component, an optically active cholesteric component, and a tetra-azo dichroic dye guest component having a dichroic ratio of at least 0.72. The tetra-azo dye is selected from the group consisting of ##STR1##
Claims19
A cholesteric guest-host liquid crystal composition having a positive dielectric anisotropy comprising a phenylcyclohexane-containing positive nematic host component, an optically active cholesteric component, and a tetra-azo dichroic dye guest component capable of fully dissolving in said host component at concentration levels associated with dyes having fewer azo groups and having a dichroic ratio of at least 0.72, said tetra-azo dye selected from the group consisting of ##STR15##
Dependencies are inferred from the claim text.