Patent ID: 7505090

Claim:
A liquid crystal display device comprising: a polarizing plate; a pair of substrates, at least one of which is transparent; a pair of electrodes; and a nematic liquid crystal, said nematic liquid crystal: (a) being filled between the pair of substrates; (b) being aligned to be substantially perpendicular to the substrates when a voltage applied to the pair of electrodes is zero or not higher than a threshold value; (c) having negative dielectric constant anisotropy; (d) undergoing change in tilt angle of alignment with respect to the substrates in accordance with the applied voltage higher than the threshold value; and (e) displaying colors of red, purple, and blue according to a retardation of the nematic liquid crystal which varies with the change of the tilt angle, wherein a rate of change in the retardation with respect to temperature becomes zero at an applied voltage, and wherein the displayed color is red or purple when the voltage at which the rate of change in the retardation with respect to temperature becomes zero is applied.