Patent ID: 7683875
Filing Date: 2010-03-23
Classification: G02F,G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal panel comprising a first substrate, a second substrate and a liquid crystal layer, said liquid crystal layer comprising liquid crystal having negative dielectric anisotropy provided between the first and second substrates; and a drive voltage setting section which sets a drive voltage to drive the liquid crystal panel and supplies the set drive voltage to the liquid crystal panel, wherein: the drive voltage setting section sets a drive voltage in accordance with viewing angle characteristics of the liquid crystal panel, thereby controlling viewing angle characteristics, and switches between wide viewing angle characteristics and narrow viewing angle characteristics, wherein the drive voltage is such that the transmission intensity at oblique viewing angle is increased to strengthen excess brightness and grayscale inversion, achieving narrow viewing angle characteristics, and the transmission intensity at oblique viewing angle is decreased to weaken the excess brightness and grayscale inversion, achieving wide viewing angle characteristics, wherein in narrow viewing angle operation, a black voltage at the lower end of grayscale at oblique viewing angle which is a drive voltage to be supplied to the liquid crystal pane is set to be larger than a black voltage having basic characteristics, in wide viewing angle operation, a white voltage at the higher end of grayscale at oblique viewing angle is set to be a voltage which does not cause grayscale inversion while the black voltage at the lower end of grayscale at oblique viewing angle which is a drive voltage to be supplied to the liquid crustal panel has basic characteristics, and wherein the basic characteristics indicate display characteristics where the transmission intensity at the oblique viewing angle is larger than the transmission intensity at the front when the liquid crystal panel is not subjected to the viewing angle control.