P‐61: A Mura Optimization Scheme Based on AMOLED DC Dimming

The current OLED panel usually adopts hybrid dimming, DC dimming is used in the high‐light part to improve human eye comfort and save power consumption, and PWM dimming is used in the low‐light part to improve the uniformity of the picture and improve the MURA problem introduced by the poor consistency of the driver TFT. However, for some consumers who are sensitive to flicker, it is still required that OLED panels can also use DC dimming in low‐brightness bands to improve eye comfort. The realization of full DC dimming has become the direction that the industry needs to improve. In this paper, MURA optimization of low brightness display under full DC is realized based on VREFN2 (OLED anode reset voltage) and ELVSS (OLED cathode voltage) voltage difference setting optimization and De‐MURA scheme optimization. It is proved that the new scheme can improve the gray scale MURA of low brightness Band under full DC condition to be equivalent to PWM dimming.