Patent ID: 6816217
Filing Date: 2004-11-09
Classification: G02F

Abstract:
A transflective liquid-crystal display device comprising:a liquid crystal cell, the liquid crystal cell containing: a liquid crystal layer; a pair of mutually opposing transparent substrates sandwiching the liquid crystal layer; transparent electrodes and an alignment film formed close to an inner surface of one of the transparent substrates in that order; other transparent electrodes and another alignment film formed close to an inner surface of the other transparent substrate in that order; and a transflector disposed close to the one transparent substrate; a first optical compensating plate and a first polarizer formed close to an outer surface of the other transparent substrate in that order; a second optical compensating plate and a second polarize formed close to an outer surface of the one transparent substrate in that order; and an illuminator that is disposed close to an outer surface of the second polarizer and which emits light toward the liquid crystal cell, wherein the liquid crystal layer contains a liquid crystal composition which has a positive dielectric anisotropy, which is twisted by about 220 to 260 degrees, and which is sandwiched by the pair of transparent substrates, wherein the transflector contains a high-reflectivity film having a plurality of fine apertures therein and the high-reflectivity film contains a diffuse reflection surface, on the surface thereof, whose reflected luminance characteristic is controlled, wherein the first optical compensating plate formed close to the outer surface of the other transparent substrate comprises first and second retardation films, and the second optical compensating plate formed close to the outer surface of the one transparent substrate comprises a third retardation film, wherein, when an alignment direction a of the alignment film close to the other transparent substrate and an alignment direction b of the alignment film close to the one transparent substrate are viewed from above, a reference direction X lies between the alignment directions a and b, passes through an intersection O of the alignment directions a and b, and also extends along a line bisecting an inner angle formed by the alignment directions a and b, wherein at a measuring wavelength of 546 nm and with respect to the reference direction X in a counterclockwise direction when viewed from above: the first retardation film has a birefringent retardation (&Dgr;ndRF1) of about 150 to 190 nm, and a slow axis &bgr; which forms an angle (&PHgr;RF1) of about 65 to 95Â°, the second retardation film has a birefringent retardation (&Dgr;ndRF2) of about 350 to 400 nm, and a slow axis &ggr; which forms an angle (&PHgr;RF2) of about 90 to 135Â°, the first polarizer has an absorption axis &agr; which forms an angle (&PHgr;pol1) of about 35 to 55Â°, the third retardation film has a birefringent retardation (&Dgr;ndRF3) of about 115 to 135 nm, and a slow axis &dgr; which forms an angle (&PHgr;RF3) of about 55 to 85Â°, and the second polarizer has an absorption axis &egr; which forms an angle (&PHgr;pol2) of about 10 to 40Â°; and wherein an angle formed by the slow axis &dgr; of the third retardation film and the absorption axis &egr; of the second polarizer is about 30 to 50Â°.