Patent ID: 7154672

Claim:
An optical film, for use in a liquid crystal display which comprises a liquid crystal cell and a back light unit, comprising a layered product of, (1) a reflective polarizer by which light is selectively P/S converted, which is disposed on the back light unit, and (2) a light scattering film that scatters and transmits light and comprises at least two phases having different refractive indices from each other, which is disposed on the reflective polarizer, wherein at least one of the phases which has the greater refractive index in the light scattering film has pillar structures extending in the thickness direction of the film, and further where the refractive index changes gradually at the interface of the greater refractive index phase and another phase, and furthermore the transmittance of the light scattering film in the normal direction of the film is not less than 4%, and wherein an absolute value of a light incident angle where the scattering film has a maximum scattering performance is larger than zero degrees, when zero degrees is a light incident angle that light enters the film in the normal direction of the film.