Patent ID: 8268413

Claim:
A liquid crystal display device, comprising: a color filter substrate and an array substrate; and an optical compensation film, disposed on the color filter substrate and/or the array substrate, wherein the optical compensation film comprises a polyimide, and the polyimide comprises the formula: wherein n is an integer greater than 1, A is and B is wherein X and Y are —CH 3 , —CF 3 , —OH, —OR, —Br, —Cl or —I, R is alkyl of from 1 to 18 carbons, and Z is —C(CH 3 ) 2 —, —Ar—O—Ar—, —Ar—CH 2 —Ar—, —O—Ar—C(CH 3 ) 2 —Ar—O—, —O—Ar—Ar—O—, —O—Ar—C(CF 3 ) 2 —Ar—O—, or —Ar—C(CH 3 ) 2 —Ar—, and Ar is benzene.