Patent ID: 7609346
Filing Date: 2009-10-27
Classification: G02F

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°±10°, held between the first substrate and the second substrate; and an optical element provided on an outer surface of the second substrate, wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½ wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼ A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate, a retardation value Δn·d of the liquid crystal layer is set at 200 nm ±30 nm, where Δn is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, and wherein a horizontal direction of the major surface of either of the first and second substrates is a reference azimuth, a counterclockwise direction relative to the reference azimuth is a positive direction and a clockwise direction relative to the reference azimuth is a negative direction, a director of the liquid crystal molecules is set within a range of 225°±20° or a range of 315°±20° relative to the reference azimuth.