Patent ID: 7997743

Claim:
An optical film comprising: a base member; and an optical layer disposed on the base member, the optical layer having an asperity in a surface, wherein the asperity is formed by applying a coating material containing microparticles and a resin on the base member, distributing the microparticles densely in some parts and sparsely in other parts by convections that occur in the coating material, and curing the coating material, an average diameter of the microparticles is 2.4 μm or more and 8 μm or less, an average thickness of the optical layer is 6.4 μm or more and 18 μm or less, an arithmetic mean roughness Ra of a roughness profile of the surface of the optical layer is 0.03 μm or more and 0.15 μm or less and a root-mean-square slope RΔq of the roughness profile is 0.01 or more and 0.03 or less, and the difference in refractive index between the resin and the microparticles is 0 or more and 0.015 or less.