Patent ID: 8654287

Claim:
An optical compensation film for IPS or FFS-mode liquid crystal display devices, having the tilt angle θ[°] not equal to zero, β[°] being defined as φ giving the minimum value of retardation R[φ] which is retardation measured for incident light coming in a direction tilted by φ° from a normal line relative to the film-plane, with the in-plane slow axis of the optical compensation film as a rotation axis; having retardation in plane at a wavelength of 550 nm, Re(550), of from 0 nm to 10 nm; having retardation along the thickness direction at a wavelength of 550 nm, Rth(550), of from −30 nm to 30 nm, provided that Rth(550) is not equal to zero; and having wavelength dispersion characteristics of Re, |Re(630)−Re(450)|, of equal to or less than 1.5 nm, and wavelength dispersion characteristics of Rth, |Rth(630)−Rth( 450 )|, of equal to or less than 4 nm.