Patent ID: 8891169

Claim:
An optical sheet comprising: a plurality of layers, at least one of the plurality of layers being an optical functional sheet layer which includes: prisms arranged in parallel along a surface of the optical sheet in such a way that light is transmittable; and light-absorbing portions arranged in parallel between the prisms in such a way as to absorb light, at least another one of the layers being a light diffusing material-containing layer with optical diffusing particles dispersed in a sheet-shaped base material, and the optical sheet satisfying a relation of Nd K <Nd R and 10≦νd R −νd K ≦30,wherein Nd K is a refractive index of the base material of the light diffusing material-containing layer and νd K is an Abbe number thereof, Nd R is a refractive index of the optical diffusing particles and νd R is an Abbe number thereof.