Patent ID: 7969399

Claim:
A driving circuit of an active matrix liquid crystal display device comprising a plurality of video signal lines for transmitting a plurality of video signals representing an image to be displayed, a plurality of scanning signal lines intersecting the plurality of video signal lines, and a plurality of pixel formation portions that are arranged in a matrix in correspondence with intersections of the plurality of video signal lines and the plurality of scanning signal lines, the driving circuit comprising: a video signal line driving circuit for supplying the video signals to the plurality of video signal lines such that, within a single frame period, the polarities of voltages applied to the pixel formation portions are inverted at every predetermined number of scanning signal lines, the predetermined number being at least 2; a scanning signal line driving circuit for selectively driving the plurality of scanning signal lines; and a signal width setting circuit for setting a first signal width representing a period during which an output of the video signals is used to charge one pixel formation portion when an active scanning signal is supplied to a first scanning signal line of the predetermined number of scanning signal lines and a second signal width representing a period during which an output of the video signals is used to charge one pixel formation portion when an active scanning signal is supplied to a second or further scanning signal line of the predetermined number of scanning signal lines; wherein the video signal line driving circuit generates the video signals based on the first signal width and the second signal width; wherein the scanning signal line driving circuit generates a scanning signal that becomes active in accordance with the first signal width and the second signal width; wherein the first signal width is set to a larger width than the second signal width; wherein the signal width setting circuit sets the first signal width and the second signal width dynamically based on a measured difference between a first target pixel voltage and a second target pixel voltage during the output of the video signals; wherein the signal width setting circuit generates the first and second target pixel voltages based on image data corresponding to the pixel formation portions of the first scanning signal line and the second or further scanning signal line; wherein the signal width setting circuit generates the first target pixel voltage based on image data corresponding to the pixel formation portions of the first scanning signal line; and wherein the signal width setting circuit generates the second target pixel voltage based on image data corresponding to the pixel formation portions of the second or further scanning signal line.