| 摘要 |
An optical sheet comprising: a transparent substrate; a light diffusion layer having a surface roughness structure which is provided on one surface of the transparent substrate; and a light diffusion adhesive layer provided on the other surface of the transparent substrate, wherein the light diffusion layer comprises a resin and first diffusion particles having a number-average particle size of 1.7 mum or above, the light diffusion adhesive layer comprises a binder, highly refractive nanoparticles and second diffusion particles, and the relationship x1 > x2 is satisfied, where the haze of the light diffusion layer is x1 (%) and the haze of the light diffusion adhesive layer is x2 (%); and a surface light source apparatus provided with said optical sheet and an organic electroluminescent light-emitting element. |
