| 摘要 |
PROBLEM TO BE SOLVED: To provide an optically compensated film and a method for manufacturing the film which easily develops the biaxial characteristics and has required retardation characteristics distributed uniformly in the plane, and to provide a polarization plate and a liquid crystal display which use the film. SOLUTION: The optically compensated film is manufactured, by biaxially stretching a thermoplastic resin film at a time in the longitudinal direction and in the lateral direction and the film shows 0 to 500 nm retardation in the plane (Re=(nx-ny)d) and 0 to 500 nm retardation in the thickness direction (Rth=(nx-ny)d), satisfying Re/Rth<1, wherein d is the thickness of the film, nx, ny are the principal refractive indices in the plane of the film, under the condition of nx>ny, and nz is the principal refractive index in the thickness direction. By subjecting the film to a process of reducing the drawing rate in the lateral direction after the simultaneous biaxial stretching, uniformity in the film plane is further improved. |
