Patent ID: 6094243
Filing Date: 2000-07-25
Classification: G09G

Abstract:
A liquid crystal display device including a liquid crystal panel, the panel comprising:a plurality of row electrodes to which scanning signals are applied;a plurality of column electrodes arranged so as to cross the plurality of row electrodes to which display signals are applied; anda liquid crystal layer interposed between the row electrodes and the column electrodes for displaying images in response to a value of an effective voltage applied between the row electrode and the column electrode at intersections of the row electrodes and the column electrodes, the device comprising:a display data transformer for receiving input image data for one frame, for dividing a selection period for each row electrode in the frame into subframes of a number equal to or greater than a number of gray-scale bits representing a gray-scale level of the input image data, the scanning signal being applied to the row electrode during the corresponding selection period, and for generating binary display data in which respective binary data is associated with each subframe according to the gray-scale bits;a pulse width controller for controlling the division of the selection period in the display data transformer and for setting a respective subframe period independently for each subframe; anda pulse amplitude controller for transforming the binary display data by setting a respective voltage amplitude independently for each subframe according to the binary display data so as to generate a display signal having a respective voltage value set independently for each subframe, wherebyan effective voltage according to the gray-scale bits of the input image data is applied to the liquid crystal display layer so as to conduct a gray-scale display for the input image data.