Patent ID: 8031308
Filing Date: 2011-10-04
Classification: G02B,G02F,Y10T

Abstract:
1. A uniaxial retardation film having an optical axis out of plane and where extraordinary ray refraction index<ordinary ray refraction index, wherein the retardation film satisfies the following equations (19) to (22): in equations (19) to (22), Rxy(λ), Rxz(λ) represent the retardation Rxy, Rxz of the retardation film at wavelength λnm respectively, and are defined as Rxy=(nx−ny)×d, Rxz=(nx−nz)×d where nx, ny (nx≧ny) are the principal refraction indexes in the in plane direction, nz is the principal refraction index in the out of plane direction, and d is the thickness in the retardation film.