Patent ID: 7511785
Filing Date: 2009-03-31
Classification: G02F

Abstract:
1. A liquid crystal display having a liquid crystal cell of bend alignment mode and a pair of polarizing plates provided on both sides of the cell, wherein at least one of the polarizing plates comprises a polarizing membrane and an optical compensatory film positioned nearer to the liquid crystal cell than the polarizing membrane, said optical compensatory film having at least two optically anisotropic layers comprising first and second optically anisotropic layers, said first optically anisotropic layer being made from discotic compounds oriented in hybrid alignment, said second optically anisotropic layer consisting of a cellulose ester film, and said polarizing membrane and said first and second optically anisotropic layers being so placed that the first optically anisotropic layer giving in plane the maximum refractive index in a direction of essentially 45° to a transmission axis in plane of the polarizing membrane, and that the second optically anisotropic layer gives in plane the maximum refractive index in a direction essentially parallel or perpendicular to a transmission axis in plane of the polarizing membrane, and wherein the liquid crystal cell of bend alignment mode and the first and second optically anisotropic layers have optical characteristics satisfying the following formula (1) when measured at any wavelength of 450 nm, 550 nm and 630 nm: in which Δn is an inherent birefringent index of rod-like liquid crystal molecules in the liquid crystal cell; d is a thickness of a liquid crystal layer in the liquid crystal cell in terms of nm; Re 1 is a retardation value in plane of the first optically anisotropic layer; and Rth 2 is a retardation value along a thickness direction of the second optically anisotropic layer, wherein the optical compensatory film gives retardation values Re(0°), Re(40°) and Re(−40°) at 546 nm in the ranges of 30±10 nm, 50±10 nm and 115±10 nm, respectively, and wherein Re(0°), Re(40°) and Re(−40°) stand for retardation values of the optical compensatory film when the retardation is measured, in a plane including the normal of the film and the direction giving in the film plane the minimum refractive index of the optical compensatory film, in the directions inclined at 0°, 40° and reversely 40° from the normal to the plane, respectively, and wherein the first optically anisotropic layer further contains a fluorine-containing polymer in the range of 0.005 to 8 wt. % based on the amount of components of a coating solution other than a solvent.