Patent ID: 7787084

Claim:
An optical compensation film, comprising a longitudinal direction and an in-plane refractive-index-reducing direction, wherein the optical compensation film satisfies the following optical properties within a plane through which the normal line of the optical compensation film and the direction of 45° inclined from the longitudinal direction toward the in-plane refractive-index-reducing direction pass: (i) a retardation value Re(0°) measured in the normal line direction using a light of wavelength 550 nm is in a range of 37±6 nm; (ii) a retardation value Re(40°) measured in a direction inclined 40°, toward the plane of the optical compensation film, from the normal line using a light of wavelength 550 nm is in a range of 50±6 nm; and (iii) a retardation value Re(−40°) measured in a direction inclined 40°, to the direction opposite to the direction of (ii), from the normal line using a light of wavelength 550 nm is in a range of 124±12 nm.