Patent ID: 7364776

Claim:
A display device comprising a plurality of liquid crystal layers disposed between a pair of electrodes respectively, wherein each of the liquid crystal layers shows an absorption peak at a different wavelength and comprises at least one dichroic dye and at least one dual-frequency switchable liquid crystal as a host liquid crystal, wherein said dichroic dye comprises a chromophoric group having a substituent represented by formula (1): -(Het) i {(B 1 ) p -(Q 1 ) g -(B 2 ) r } n -C 1 formula (1) in which Het represents an oxygen atom or 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; j represents 0 or 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 in formula (1) is from 3 to 10; when 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 the same as or different from each other; and when n is equal to or larger than 2, {(B 1 ) p -(Q 1 ) g -(B 2 ) r }present in two or more units may be the same as or different from each other.