Patent ID: 8184247
Filing Date: 2012-05-22
Classification: B32B,G02B,G02F,Y10T

Abstract:
1. An optical compensatory film of a laminated structure comprising: a first optically anisotropic layer having an Re(550) of 20 to 100 nm wherein retardation at a wavelength of 550 nm is never 0 nm along any direction and the direction along which the absolute value of retardation at a wavelength of 550 nm reaches minimum does not exist along the normal direction of the layer or on the in-plane of the layer; and a second optically anisotropic layer having an Re(550) of 20 to 150 nm and an Rth(550) of 40 to 110 nm with the following inequality formulae (a) and (b) being satisfied: wherein Re(450) represents an in-plane retardation at a wavelength of 450 nm; Re(550) represents an in-plane retardation at a wavelength of 550 nm; Rth(450) represents a retardation along the thickness direction at a wavelength of 450 nm; and Rth(550) represents a retardation along the thickness direction at a wavelength of 550 nm.