OPTICAL FILM, METHOD FOR PRODUCING SAME AND LUMINANCE IMPROVING FILM

摘要

Provided is an optical film which is a continuous optical film; has layer (A) comprising resin composition (P) that contains a resin having a positive intrinsic birefringence value and another resin having a negative intrinsic birefringence value; has an orientation angle (?) of 40o to 50o; and satisfies the relation: Re450550650 [wherein Re450 represents an in-plane retardation value measured with light having a wavelength of 450 nm; Re550 represents an in-plane retardation value measured with light having a wavelength of 550 nm; and Re650 represents an in-plane retardation value measured with light having a wavelength of 650 nm].  Also provided are a luminance improving film which comprises said optical film and a method for producing the same.