Patent ID: 8633290

Claim:
An optical compensation film comprising an optical resin, wherein said optical resin comprises: a copolymer of 4-methyl-1-pentene, and at least one monomer selected from the group consisting of 3-methyl-1-pentene, 3-methyl-1-butene and 4,4-dimethyl-1-pentene; wherein, in said optical resin, the content of a constituent unit (a) derived from said 4-methyl-1-pentene is equal to or more than 60 mol % and equal to or less than 99 mol %, and the total content of a constituent unit (b) derived from said at least one monomer selected from the group consisting of 3-methyl-1-pentene, 3-methyl-1-butene and 4,4-dimethyl-1-pentene is equal to or more than 1 mol % and equal to or less than 40 mol %; wherein the light transmittance at a wavelength of 590 nm is not less than 80%, and the optical film satisfies both conditions of the following formulae (1) and (2); R (450)/ R (590)<0.95 (1) wherein in the above formula (1), each of R(450) and R(590) represents the in-plane retardation of the optical film at wavelengths of 450 nm or 590 nm, | dR (590)/ dT/R (590)×100|<2.0(%/° C.) (2) wherein in the above formula (2), dR(590)/dT represents the change per 1 degree centigrade of the in-plane retardation of the optical film at a wavelength of 590 nm; and R(590) represents the in-plane retardation of the optical film at a wavelength of 590 nm; and wherein said film is stretched to not less than 1.5 times and not more than 10 times.