Patent ID: 9208718
Filing Date: 2015-12-08
Classification: G09G

Abstract:
1. A method of compensating gamma reference voltages, the method comprising: setting a first emission signal on-duty ratio, a second emission signal on-duty ratio, and a third emission signal on-duty ratio that have different values in a range from 0% to 100%, a value of the first emission signal on-duty ratio being greater than a value of the second emission signal on-duty ratio, the value of the second emission signal on-duty ratio being greater than a value of the third emission signal on-duty ratio; setting data offsets for the first through third emission signal on-duty ratios, each of the data offsets being based on a color shift, the color shift being caused according to the first through third emission signal on-duty ratios; obtaining an average data offset by calculating an average of the data offsets; generating a first compensation gamma reference voltage corresponding to the first emission signal on-duty ratio by multiplying a gamma reference voltage by the average data offset; generating a second compensation gamma reference voltage corresponding to the second emission signal on-duty ratio by multiplying the first compensation gamma reference voltage by the average data offset; generating a third compensation gamma reference voltage corresponding to the third emission signal on-duty ratio by multiplying the second compensation gamma reference voltage by the average data offset; and applying the first through third compensation gamma reference voltages to an organic light emitting display (OLED) panel in dimming ranges that include the first through third emission signal on-duty ratios, respectively.