Patent ID: 7515339
Filing Date: 2009-04-07
Classification: G02B

Abstract:
1. A light pipe comprising: a laminate having a light-transmitting resin plate, and a polarized-light scattering plate laminated on at least one surface of said light-transmitting resin plate, such that said polarized-light scattering plate is disposed outside of an area occupied by said light-transmitting resin plate, said polarized-light scattering plate having fine birefringent domains dispersed therein to exhibit anisotropy in scattering depending on a polarization direction; a specular reflection layer provided on a first surface of said laminate; and a polarization-retaining light diffusion layer provided on a second surface of said laminate, wherein said light-transmitting resin plate is disposed between said polarized-light scattering plate and said polarization-retaining light diffusion layer, wherein said polarized-light scattering plate is a continuous plate that extends along the entire length of said light-transmitting resin plate, and wherein said light diffusion layer comprises an optically isotropic light-transmitting resin layer having transparent particles of a refractive index ratio of from 0.9 to 1.1 dispersed therein.