Patent ID: 7692747
Filing Date: 2010-04-06
Classification: G02F

Abstract:
1. A liquid crystal display device of an in-plane switching mode which comprises a pair of polarizers which are a polarizer at an output side and a polarizer at an incident side and disposed at relative positions such that absorption axes of the polarizers are approximately perpendicular to each other and at least an optically anisotropic member and a liquid crystal cell which are disposed between the pair of polarizers, wherein n z >n x >n y when, with respect to the optically anisotropic member, a refractive index in a direction of an in-plane slow axis is represented by n x , a refractive index in a direction in-plane and perpendicular to the direction of an in-plane slow axis is represented by n y , and a refractive index in a direction of a thickness is represented by n z , each measured using light having a wavelength of 550 nm; and the in-plane slow axis of the optically anisotropic member and the absorption axis of a polarizer disposed closer to the optically anisotropic member are disposed at relative positions approximately parallel or approximately perpendicular to each other, wherein an in-plane retardation R e (as measured in nanometers) and a retardation in the direction of the thickness R th (as measured in nanometers) of the optically anisotropic member satisfy the following formulae: wherein the absorption axis of the polarizer at the output side and the in-plane slow axis of a liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions parallel to each other, and the optically anisotropic member is disposed between the liquid crystal cell and the polarizer at the output side, and wherein the in-plane slow axis of the optically anisotropic member and the in-plane slow axis of a liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions approximately perpendicular to each other.