Patent ID: 7532398

Claim:
A light pipe comprising: a laminate having a birefringent light-transmitting resin plate, and a polarized-light scattering plate laminated on at least one surface of 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; and a specular reflection layer provided on a surface of said laminate, such that said specular reflection layer is on a side of said laminate which is opposite said birefringent light-transmitting resin plate, wherein said polarized-light scattering plate is positioned between said light-transmitting resin plate and said specular reflection layer, said light-transmitting resin plate and said polarized-light scattering plate do not contact each other, and a phase difference due to birefringence of the light-transmitting resin plate is 50 nm or more based on an average phase difference in a plane of said light-transmitted resin plate.