Patent ID: 9489911
Filing Date: 2016-11-08
CPC Classification: G09G

Claim Text:
1. A display device comprising: a first pixel group including a white pixel and a blue pixel; a second pixel group including a red pixel and a green pixel; a first gate signal line connecting the first pixel group; a second gate signal line connecting the red pixel of the second pixel group; a third gate signal line connecting the green pixel of the second pixel group; and a grayscale voltage generating circuit including a resistor ladder and outputting a grayscale voltage to the first pixel group and the second pixel group, wherein: the first pixel group has an electrode area size larger than that of the second pixel group; a voltage drop adjusted central value of positive-side grayscale voltage and negative-side grayscale voltage for the first pixel group is set to be a common voltage which is a fixed value; a voltage drop adjusted central value of positive-side grayscale voltage and negative-side grayscale voltage for the second pixel group is set to be an optimal common voltage of the second pixel group; a difference between the common voltage and the optimal common voltage of the second pixel group is corrected by shifting entire positive-side and negative-side grayscale voltage of the second pixel group by increasing or reducing that of the second pixel group; the grayscale voltage generating circuit output the grayscale voltage of the first pixel group according to the first gate signal line high voltage period, and the grayscale voltage of the second pixel group according to the second gate signal line high voltage period, and the grayscale voltage generating circuit generates the grayscale voltage of the second pixel group using the resistor ladder which configure to output a voltage shifted from the grayscale voltage of the first pixel group.