Patent ID: 7710512
Filing Date: 2010-05-04
Classification: G02B,G02F

Abstract:
1. A backlight unit configured to illuminate a liquid crystal panel, comprising: at least one light source; at least one prism sheet disposed at the back of the liquid crystal panel; and a light guide plate including a light incidence surface disposed adjacent to the light source and a light emitting surface disposed substantially in parallel with the prism sheet, wherein the prism sheet including: a protective layer including a base material and a plurality of diffusion particles distributed in the base material, wherein the base material includes a light-transmissive resin; a base film disposed on a surface of the protective layer, wherein the light emitted from the protective layer is input into the base film; and a plurality of linear prisms disposed in parallel on a surface of the base film, wherein the diffusion particles comprise a plurality of beads having a size of between about 2 μm and about 10 μm, and the plurality of linear prisms have a pitch of between about 32 μm and about 36 μm, and wherein the at least one prism sheet includes at least two prism sheets disposed in such a manner that the axes of the linear prisms of the two prism sheets are disposed to cross each other.