Patent ID: 6542300
Filing Date: 2003-04-01
Classification: G02B,G02F

Abstract:
A polarizer comprising:a polarizing element; and at least one transparent protective film constituted by two layers of retardation films with an in-plane retardation in a range of from 190 to 320 nm with respect to light having a wavelength of 550 nm, said transparent protective film being bonded onto one of opposite surfaces of said polarizing element so that a fast axis of each of said retardation films is parallel with an absorption axis of said polarizing element, said two layers of retardation films being constituted by a combination of a retardation film with Nz of from 0.05 to 0.2 and a retardation film with Nz of from 0.3 to 0.45 in a condition of nx>ny and Nz=(nxâˆ’nz)/(nxâˆ’ny) in which nx and ny are in-plane refractive indices of said retardation films respectively, and nz is a refractive index in a direction of thickness of each of said retardation films.