Patent ID: 7760293

Claim:
An optical film comprising a transparent polymer film, wherein the optical film has: a value A1 defined by formula (1), the value A1 ranging from 0.10 to 0.95; a value A2 defined by the formula (2), the value A2 ranging from 1.01 to 1.50; and a glass transition temperature of 120° C. or higher: Value A 1= Re (450)/ Re (550) (1) Value A 2= Re (650)/ Re (550) (2) wherein Re(λ) indicates an in-plane retardation value of the optical film to light having a wavelength of λ (nm); wherein the optical film comprises a compound in an amount of 0.01 to 30% by mass, the compound having a maximum absorption wavelength λmax shorter than 250 nm in a UV absorption spectrum of a solution of the compound.