Patent ID: 7338690

Claim:
A liquid crystal composition comprising at least a dichroic dye represented by a following formula (3), and a dual-frequency switchable nematic liquid crystal as a host liquid crystal: where R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , and R 17 respectively represent a hydrogen atom or a substituent, provided that at least one represents a substituent represented by —S—{(B 1 ) p -(Q 1 ) q -(B 2 ) r } n —C 1 , in which S represents a sulfur atom; B 1 and B 2 respectively represent a substituted or non-substituted arylene group, heteroarylene group or divalent cyclic aliphatic hydrocarbon group; Q 1 represents a divalent linking group; C 1 represents a substituted or non-substituted alkyl group, cycloalkyl group, alkoxy group, alkoxycarbonyl group, acyl group or acyloxy group; p, q and r respectively represent an integer from 0 to 5; and n represents an integer from 1 to 3, provided that a total number of groups represented by B 1 and B 2 is from 3 to 10; in case any of p, q and r is equal to or larger than 2, B 1 , Q 1 or B 2 present in two or more units may be same or different to each other; and, in case n is equal to or larger than 2, {(B 1 ) p -(Q 1 ) q -(B 2 ) r } present in two or more units may be same or different to each other.