Electro-optic device
AssigneeRCA Corporation
InventorAllen Bloom
Life of this patent
Estimating the term…
Abstract
Novel dyes of the formula ##STR1## wherein X can be hydrogen, alkyl, alkoxy, cyano, nitro, dialkylamino, halogen or --N.dbd.N--Y and Y can be phenyl, phenyl substituted in the para position with an alkyl, alkoxy, cyano, nitro, dialkylamino or halogen group, or a heterocyclic ring, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.
Claims5
In an electro-optic device comprising a nematic liquid crystal composition having a positive dielectric anisotropy between two electrodes, the improvement wherein said nematic liquid crystal composition contains a dye of the formula ##STR7## wherein X can be hydrogen, alkyl, alkoxy, cyano, nitro, dialkylamino, halogen or --N.dbd.N--Y and Y can be phenyl, phenyl substituted in the para position with an alkyl, alkoxy, cyano, nitro, dialkylamino or halogen group, or a heterocyclic ring.
A nematic liquid crystal composition comprising a nematic liquid crystal having a positive dielectric anisotropy and a compound of the formula ##STR9## wherein X can be hydrogen, alkyl, alkoxy, cyano, nitro, dialkylamino, halogen or --N.dbd.N--Y and Y can be phenyl, phenyl substituted in the para position with an alkyl, alkoxy, cyano, nitro, dialkylamino or halogen group, or a heterocyclic ring.
Dependencies are inferred from the claim text.