LOW DOUBLE REFRACTION FILM

摘要

PROBLEM TO BE SOLVED: To eliminate a restriction to have to select a polymer having a small intrinsic double refraction and a difficulty in a generation of an orientation double refraction in a prior art. SOLUTION: An apparent double refraction is reduced by stretching the polymer in a direction for developing a negative orientation double refraction with respect to an intrinsic double refraction, and cancelling the intrinsic double refraction by the orientation double refraction.