Liquid crystal display having wide viewing angle range

Abstract

In a liquid crystal display having a wide viewing angle range, first and second retardation films each having negative optical anisotropy in which the refractive index in the axial direction tilted in a predetermined direction with respect to the normal line to the film plane are inserted between a liquid crystal cell including a pair of substrates and a front polarizer and between the liquid crystal cell and a rear polarizer, respectively, such that the direction components along the film planes of the axial directions are set along the aligning treatment directions of the liquid crystal cell. A third retardation film having refractive index anisotropy in the film plane is arranged between the first retardation film and the adjacent front polarizer such that the maximum refractive index direction in the film plane becomes parallel or perpendicular to the absorption axis of the front polarizer. The retardation difference generated by light that becomes incident on the liquid crystal display obliquely with respect to the normal direction is compensated by the third retardation film. Residual retardation in liquid crystal molecules near the substrate of the liquid crystal layer is compensated by the first and second retardation films. Hence, high-contrast display at a wide viewing angle can be obtained independently of the incident angle.