DIFFUSER PLATE FOR FORMING LUMINOUS SURFACE BY LIGHT IRRADIATED FROM LIGHT SOURCE, AND DIRECT-TYPE BACK LIGHT

摘要

PURPOSE: A diffuser plate and a drop-type back light are provided to diffuse a light incident on a diffuser plate at both diffusive base layer and diffusive beads layer, thereby increasing a diffusion action on the diffuser plate, consequently a lamp image can be effectively relieved while preventing brightness deterioration. CONSTITUTION: A diffuser plate(5) for forming a luminous surface by a light irradiated from a light source comprises as follows. A diffusive base layer(51) has optical diffusion. A diffusive beads layer(54) is formed on at least one of an optical incident surface(52) and an optical emission side(53) of the base layer(51). The incident light is optically diffused at both diffusive base layer(51) and the diffusive beads layer(54).