Patent ID: 7532283
Filing Date: 2009-05-12
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device comprising a pair of polarization plates each including a polarizer and a pair of protective layers laminated over the polarizer to protect the latter, the transmission axes of the polarizers being orthogonal to each other, and a liquid crystal plate disposed between the polarization plates and including a liquid crystal layer having the molecules thereof aligned parallel with the absorption axis of one of the polarization plates, wherein: each of the protective layers in the pair of polarization plate is a uniaxial retardation film whose thickness is d there is disposed between the liquid crystal plane and any one of the polarization plates a biaxial retardation film of thickness d wherein the biaxial retardation film has a refractive index of nx>nz>ny and generally meets a relation nz=(nx+ny)/2 (where nz is a refractive index in the direction of thickness, nx is maximum refractive index in a plane perpendicular to the thickness direction and ny is a refractive index in a direction perpendicular to a direction for the maximum refractive index nx and thickness direction for a refractive index nz); and on the assumption that with a predetermined wavelength λ in the visible light domain, the in-plane light path length difference Δnd