Dichroic coloring agents for liquid crystal displays.

摘要

Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following formula: <CHEM> wherein X is S or NH; R1 is a hydrogen atom, halogen atom, alkyl group or alkoxy group; and R2 is a hydrogen atom, alkyl group, aryl group or aralkyl group.