Patent ID: 6597335
Filing Date: 2003-07-22
Classification: G09G

Abstract:
A method for driving a liquid crystal display device having a plurality of row electrodes to which a scanning signal is applied;a plurality of column electrodes to each of which a display data signal is applied, said plurality of column electrodes being disposed in crossing relationship with said plurality of row electrodes; and a liquid crystal layer interposed between at least one of the plurality of row electrodes and at least one of the plurality of column electrodes for performing a display at a crossing portion of said at least one of the plurality of row electrodes and said at least one of the plurality of column electrodes in response to an effective value of a voltage applied across said at least one of the plurality of row electrodes and said at least one of the plurality of column electrodes; the method comprising the steps of: generating the scanning signal from an output of an orthogonal matrix generator; simultaneously driving at least two of said plurality of row electrodes; receiving gray-scale display data including upper bits and lower bits in a predetermined weighted relationship to one another; varying a combined magnitude of the scanning signal and the display data signal so as to control an effective value of the voltage applied across said at least one of the plurality of row electrodes and said at least one of the plurality of column electrodes by, (i) distributing one period of applying a first display data voltage corresponding to said upper bits and another period of applying a second display data voltage corresponding to said lower bits during one horizontal scanning period according to the relative weights of the upper bits and the lower bits in the gray-scale display data; and (ii) varying the order of the one period of applying a first display data voltage corresponding to said upper bits and the another period of applying a second display data voltage corresponding to said lower bits during one horizontal scanning period between one of said plurality of column electrodes and another one of said plurality of column electrodes, whereby a shift of an actual voltage waveform applied to the liquid crystal relative to an ideal waveform for application to the liquid crystal is small due to a reduction in distortion of the scanning signal induced by the display data voltage.