Patent ID: 6344842
Filing Date: 2002-02-05
Classification: G09G

Abstract:
A liquid crystal display device having a pair of substrates, one of which is provided with a thin-film-transistor circuit, the other of which is provided with a common electrode, with liquid crystal provided between the substrates, said thin-film-transistor circuit including thin-film-transistors and pixel electrodes in regions surrounded by both gate lines and source lines arranged in the form of a matrix,said liquid crystal display device comprising a driving circuit which provides an electric signal having a voltage to said liquid crystal at a time of inverse driving and has one of a positive and negative polarity over one of plural frames and plural fields at the time of driving, wherein said driving circuit has a signal line driving circuit in which a voltage applied to said pixel electrodes is one of a high voltage and a low voltage over one of plural frames and plural fields, a voltage applied to said common electrode is a fixed voltage, and over the one of plural frames and plural fields: polarities of the voltages applied to the pixel electrodes remain unchanged regardless of whether the high or low voltage is applied with respect to the voltage applied to the common electrode and with respect to a voltage applied to the gate lines during a holding period, and the polarities of the voltages applied to the pixel electrodes with respect to the common electrode opposite to the polarities of the voltages applied to the pixel electrodes with respect to the gate lines during the holding period, and wherein a voltage of said electrical signal applied to the liquid crystal for displaying black differs from a voltage of said electrical signal applied to the liquid crystal for displaying white.