Patent ID: 8330911
Filing Date: 2012-12-11
Classification: G02B,G02F

Abstract:
1. A circular polarizer consisting of: one single linear polarizer producing a linear state of polarization; and two biaxial phase retardation films adjacent to the one single linear polarizer forming the circular polarizer, the circular polarizer not including a liquid crystal material, wherein said at least one biaxial phase retardation film adjacent to the one single linear polarizer comprises: a slow axis on the plane parallel to a polarizer-retarder surface of said at least one biaxial phase retardation film between one of approximately +0.1° to approximately +2.1° and approximately −0.1° to approximately −2.1° with respect to the transmission direction of the said linear polarizer; and a phase retardation on the plane parallel to the polarizer-retarder surface of approximately d·Δn=±(0.47λ˜0.49λ); and a phase retardation on the plane perpendicular to the polarizer-retarder surface of approximately d·Δn=±(0.35λ˜0.37λ) where λ is the wave length of incident light.