Patent ID: 8730431
Filing Date: 2014-05-20
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device comprising: a reflective polarizing plate provided on a back side of a liquid crystal panel, to reflect linearly polarized light in an absorption axis direction of the polarizing plate towards a direction of a backlight, and transmit linearly polarized light in a transmission axis direction of the polarizing plate; and an optical path converter in which a prism row is formed to direct light output from a light guide plate towards the liquid crystal panel, wherein the backlight has an anisotropic diffusion sheet disposed between the reflective polarizing plate and the optical path converter, wherein the anisotropic diffusion sheet includes: a refractive index nx of anisotropic sheet stretched in the absorption axis direction, in which a concave-convex portion is formed in a concave convex shape on a surface on the side of the reflective polarizing plate; an isotropic material part laminated on a surface of the concave-convex portion, having an isotropic refractive index nt, wherein the refractive index nt of the isotropic material part is the same as a refractive index ny in the direction perpendicular in plane to a stretching direction of the refractive index anisotropic sheet, wherein nx>ny, and wherein depolarization of light reflected from the reflective polarizing plate by the anisotropic diffusion sheet is greater than depolarization of light reflected from the liquid crystal panel by the anisotropic diffusion sheet.