Patent ID: 8212986

Claim:
An LCD device, comprising: an upper substrate; a lower substrate; and a liquid crystal cell, disposed between the upper substrate and the lower substrate, and containing liquid crystals, wherein the liquid crystals are arranged to be set at: a first status being a transparent status by applying a first voltage to the liquid crystals, a second status being an opaque status by applying a second voltage different from the first voltage to the liquid crystals, and a third status by applying no voltage to the liquid crystals, the third status referring to a characteristic of transmissive light or reflected light of the liquid crystals having a predetermined color, wherein the color of the reflected light is the predetermined color by controlling a phase retardation of the liquid crystal cell during a period that no voltage is applied to the liquid crystals, wherein the phase retardation is set by deciding a birefringence of the liquid crystals and a thickness of the liquid crystal cell, wherein the LCD apparatus is a transmissive LCD or a reflective LCD, wherein the liquid crystal cell comprises conditions that: a twisted angle of the liquid crystals is at zero degree; and alignment directions of the upper and the lower substrates are the same, and wherein the phase retardation is of a range of 400 nm˜1000 nm when the LCD device is the transmissive LCD, and the phase retardation is of a range of 200 nm˜500 nm when the LCD device is the reflective LCD.