Patent ID: 6937307
Filing Date: 2005-08-30
Classification: C09K,G02B,G02F

Abstract:
1. An optical compensatory sheet having a transparent support, and optically anisotropic layer formed from discotic liquid crystal molecules aligned in an average inclined angle of less than 5°, and a second optically anisotropic layer formed from rod-like liquid crystal molecules, wherein alignments of the discotic and rod-like liquid crystal molecules are fixed, and wherein the optical compensatory sheet has a retardation value in a plane defined by the following formula in the range of 10 to 1,000 nm, and a retardation value along the thickness direction defined by the following formula in the range of 10 to 1,000 nm: Re=(nx−ny)xd Rth=[{(nx+ny)/2}−nz]xd in which Re is the retardation value in plane; Rth is the retardation value along the thickness direction; and of nx and ny is a refractive index in the plane of the optical compensatory sheet; nz is a refractive index along the thickness direction of the optical compensatory sheet; and d is the thickness of the optical compensatory sheet.