Optical film, polarizing optical film, and image viewing display

摘要

An optical film obtained by stretching a polymer film comprising a polycarbonate resin and a styrene resin: wherein a photoelastic coefficient is 2.0x10<-11 >to 6.0x10<-11 >m<2>/N, and a three dimensional refractive index is controlled so that an Nz coefficient may satisfy a relationship of Nz<=0.9 and a front retardation (Re) may satisfy a relationship of Re>=80 nm, has characteristics of giving wide viewing angle and also outstanding durability.