Patent ID: 6836306
Filing Date: 2004-12-28
Classification: G02F

Abstract:
A transflective liquid crystal display device comprising:a pair of substrates; a liquid crystal layer sandwiched between the substrates; pixel electrodes located on a surface of one of the substrates facing the liquid crystal layer, each of the pixel electrodes comprising an electrode for reflective display and an electrode for transmissive display; a counter electrode located on a surface of the other substrate facing the liquid crystal layer; and an alignment film covering the surface of each of the substrates facing the liquid crystal layer, wherein a distance from the electrode for transmissive display to the other substrate is different from a distance from the electrode for reflective display to the other substrate; wherein liquid crystal molecules at a surface of the electrode for reflective display are aligned in a same direction as liquid crystal molecules above the electrode for transmissive display that are in a same plane as the liquid crystal molecules above the electrode for reflective display, the plane being parallel to principal surfaces of the substrates; and wherein a relation between dra and pra and drb and prb is expressed by the following equation: dra/pra=drb/prb wherein dra is the distance of the liquid crystal molecules above the electrode for reflective display from the surface of the substrate where the molecules make contact and the pixel electrodes are not located, pra is the twist angle of the liquid crystal molecules, drb is the distance of the liquid crystal molecules above the electrode for transmissive display from the surface of the substrate where the molecules make contact and the pixel electrodes are not located and prb is the twist angle of the liquid crystal molecules.