Novel liquid crystal dyestuffs and electro-optic devices incorporating same
AssigneeRCA Corporation
InventorsAllen Bloom, Ling K. Hung
Life of this patent
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Abstract
Novel liquid crystal dyestuffs of the formula ##STR1## wherein Y and Z are different and can be nitro or cyano and --N(R).sub.2 wherein R is alkyl or alkylene, preferably of 1 to 4 carbon atoms, and X can be hydrogen, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improve contrast in a liquid crystal electro-optic device containing such mixtures.
Claims6
In an electro-optic device comprising a nematic liquid crystal composition with a positive dielectric anisotropy between two electrodes, the improvement which comprises the addition to the liquid crystal composition of a liquid crystal dyestuff of the formula:
- ##STR17## wherein Y and Z are different one is nitro or cyano and the other is --N(R).sub.2 wherein R is alkyl or alkylene, of 1 to 8 carbon atoms, and X can be hydrogen, methyl, fluoro or chloro.
Dependencies are inferred from the claim text.