Patent ID: 6498633
Filing Date: 2002-12-24
Classification: G02F

Abstract:
A color liquid crystal display device capable of developing colors of white, red, blue and green in a same display unit, which comprises:a liquid crystal layer held between two substrates arranged substantially in parallel to each other, each provided with a transparent electrode and an aligning layer wherein the liquid crystal layer is composed of a nematic liquid crystal; the twist angle of the liquid crystal layer, according to the alignment direction of liquid crystal molecules, determined by the alignment layers on the substrates is 160-300Â°, and the product &Dgr;nLdL of the refractive anisotropy &Dgr;nL of the liquid crystal in the liquid crystal layer and the thickness dL of the liquid crystal layer is 1.0-1.5 um, a pair of polarizers disposed outside the liquid crystal layer wherein at least one of the pair of polarizers is a color polarizer; and the wavelength dependence of the polarizing efficiency of the color polarizer is 0.1-0.7 in terms of (the polarizing efficiency of a wavelength of 650 nm)/(the polarizing efficiency of a wavelength of 450 nm), 0-0.6 in terms of (the polarizing efficiency of a wavelength of 650 nm)/(the polarizing efficiency of a wavelength of 550 nm) and 0.4-1.0 in terms of (the polarizing efficiency of a wavelength of 450 nm)/(the polarizing efficiency of a wavelength of 550 nm); and a driving circuit for applying a driving voltage across the transparent electrodes, which conducts multiplex driving to enable selection of at least four different voltage values.