Patent ID: 6593919
Filing Date: 2003-07-15
Classification: G09G

Abstract:
A display panel driving system for driving a display panel including a display layer whose optical characteristic changes in response to the application of a voltage, and a plurality of scanning electrodes and a plurality of data electrodes disposed at both sides of the display layer, wherein, display elements are respectively formed in the regions in which the scanning electrodes and the data electrodes are opposed to each other, the display panel driving system comprising:a scanning electrode driving circuit which produces a scanning voltage to be applied to the scanning electrodes; a data electrode driving circuit which produces a data voltage to be applied to the data electrodes; and a control circuit which controls the operation of the scanning electrode driving circuit and the operation of the data electrode driving circuit, so that a composite voltage comprised of the scanning voltage and the data voltage is applied to the display panel by the sequential scanning method to turn the display elements into a display state, the control circuit including: a counter means for counting the number of those display elements which are brought into a display state in response to the application of a voltage corresponding to one scan, a memory means in which data maps are stored, the data maps previously associating a plurality of addresses corresponding to counting ranges of the counter means and a plurality of stages of pulse width data indicating the pulse width of the composite voltage, and a signal generation means which generates a control signal for controlling the application time of the composite voltage so as to be brought into a state, in the data maps, corresponding to the pulse width data addressed by the counting result of the counter means wherein the pulse width data associated with count values of the counter means, several consecutive count values of which are defined in respective predetermined ranges, are written at the respective addresses in the data maps.