Patent ID: 7239297

Claim:
An image display device comprising: a display panel in which a pixel electrode is arranged at every point of intersections of scanning lines and signal lines; a display control circuit to sort digital gray-scale data so as to correspond to a pixel arrangement in said display panel and to output the sorted digital gray-scale data; a scanning line driving circuit to sequentially scan said scanning line on each of rows in every scanning period; and a signal line driving circuit to generate a signal voltage responsive to said sorted gray-scale data for each of the signal lines and to feed a produced signal voltage to a corresponding signal line on each column in every scanning period; wherein said display control circuit has a gray-scale data comparison controlling circuit which produces a matching signal indicating an exact match or non-match obtained by a result from comparison between a present row of gray-scale data and a previous row of gray-scale data provided one scanning period before and exerts control so as to output said present row of gray-scale data to said line driving circuit when said matching signal indicates the non-match and not to output said present row of gray-scale data but to output said matching signal to said signal line driving circuit when said matching signal indicates the exact match; and wherein said signal line driving circuit is so configured as to latch, when said matching signal indicates the non-match, said present row of gray-scale data in response to a latch pulse providing driving timing of each of said signal lines and as to produce and output a signal voltage based on the latched present row of gray-scale data and, when said matching signal indicates an exact match, to output a signal voltage based on said previous row of gray-scale data latched from one said scanning period before.