Patent ID: 8284358
Filing Date: 2012-10-09
Classification: G02B,G02F,Y10T

Abstract:
1. A retardation film comprising: an optical axis out of plane and where extraordinary ray refraction index>ordinary ray refraction index, wherein the retardation film satisfies the following equations (e) to (h): in equations (e) to (h), 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 a thickness in the retardation film.