Patent ID: 7505099

Claim:
An optical resin film formed from at least one of a polymer and copolymer of a cycloolefin compound, the optical resin film having retardations satisfying formulae (A) to (D): 0.1<Re(450)/Re(550)<0.95 (A) 1.03<Re(650)/Re(550)<1.93 (B) 0.4<(Re(450)/Rth(450)/Re(550)/Rth(550))<0.95 (C) 1.05<(Re(650)/Rth(650)/Re(550)/Rth(550))<1.9 (D) wherein Re(λ) indicates an in-plane retardation by nm of the optical resin film with respect to light having a wavelength of λ nm; and Rth(λ) indicates a thickness-direction retardation by nm of the optical resin film with respect to the light having the wavelength of λ nm.