Patent ID: 9529130
Filing Date: 2016-12-27
CPC Classification: G02B

Claim Text:
1. An optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer has an optical property represented by the formula (3) and the optical film has optical properties represented by the formula (1) and the formula (2): wherein, Re(450) represents the in-plane phase difference value at a wavelength of 450 nm, Re(550) represents the in-plane phase difference value at a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value at a wavelength of 650 nm, nx represents the principal refractive index in a direction parallel to the film plane in an index ellipsoid formed by the phase difference layer, ny represents the refractive index in a direction parallel to the film plane and orthogonally-crossing the direction of nx in an index ellipsoid formed by the phase difference layer, and nz represents the refractive index in a direction vertical to the film plane in an index ellipsoid formed by the phase difference layer.