Patent ID: 7439946
Filing Date: 2008-10-21
Classification: G09G

Abstract:
1. A display device comprising: a display area including a plurality of gate signal lines and a plurality of drain signal lines crossing the plurality of gate signal lines, and a plurality of pixel regions surrounding the plurality of gate signal lines and the plurality of drain signal lines; a plurality of common counter voltage signal lines arranged in the respective pixel regions; a pixel electrode and a counter electrode arranged in the respective pixel regions, and wherein the display device supplies a video signal to the pixel electrode through each of the plurality of drain signal lines and said display device supplies a reference signal, which becomes a reference with respect to the video signal, to the counter electrode through each of the plurality of common counter voltage signal lines in each pixel, and wherein the display device produces a positive-side gray scale voltage and a negative-side gray scale voltage with respect to the reference signal applied to the counter electrode, and wherein the display device controls the average value of the positive-side gray scale voltage and the negative-side gray scale voltage such that: (a) the average value of the positive-side gray scale voltage and the negative-side gray scale voltage is increased when a signal amplitude of the video signal falls in a range from a minimum value to a first value, (b) the average value of the positive-side gray scale voltage and the negative-side gray scale voltage is decreased when the signal amplitude of the video signal falls in a range from the first value to a second value, and (c) the average value of the positive-side gray scale voltage and the negative-side gray scale voltage is increased when the signal amplitude of the video signal falls in a range from the second value to a maximum value.