Patent ID: 7576914
Filing Date: 2009-08-18
Classification: G02B

Abstract:
1. A light-diffusing sheet having a flat entrance surface and an exit surface parallel to the flat entrance surface, said light-diffusing sheet comprising: a sheet body; and a plurality of wedge-shaped parts, each being embedded on the side of the exit surface of the sheet body, having a section of a shape substantially resembling a wedge, expanding toward the exit surface, and being formed of a resin having a refractive index lower than that of a material of the sheet body; wherein each of the side surfaces of each of the wedge-shaped parts is formed of inclined surfaces constituting a polygonal surface, angles formed by the inclined surfaces of each side surface and the perpendicular to the entrance surface gradually become greater toward the exit surface; and an end of each of the wedge-shaped parts on the side of the entrance surface is a flat surface parallel to the entrance surface.