Retardation film and method of producing the same, and optical film, liquid crystal panel, and liquid crystal display apparatus all using the retardation film

摘要

A retardation film which hardly causes shift or unevenness in retardation values and which has a refractive index profile of nx>nz>ny (that is, 0<Rth[590]/Re[590]<1) is provided. A retardation film according to an embodiment of the present invention comprises a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (