Patent ID: 7330623

Claim:
A light guide panel comprising: an isotropic layer, comprising an incident light surface through which light from a light source is incident, a transmission surface through which light is transmitted, and a polarization recycling unit, disposed on a surface of the isotropic layer opposite the transmission surface, which changes a polarization direction of light, wherein the isotropic layer has a first refractive index; and an anisotropic layer, formed on the transmission surface of the isotropic layer, comprising a selectively transmitting and reflecting surface, disposed opposite the transmission surface of the isotropic layer, which reflects a first portion of incident light and transmits a second portion of incident light; wherein the anisotropic layer has a first refractive index, identical to the first refractive index of the isotropic layer, with respect to light having a first polarization and has a second refractive index, different from the first refractive index, with respect to light having a second polarization, such that light having the first polarization is transmitted without refraction at a boundary between the anisotropic layer and the transmission surface of the isotropic layer and light having the second polarization is refracted and transmitted at the boundary between the anisotropic layer and the transmission surface of the isotropic layer.