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A Low-luminance Compensation Current Driver for AMOLED Displays
Seonwoo Yeom,Minhyun Jin,Donggun Lee,Kyujin Kim,Soo Youn Kim 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.1
A Feedback Trans-conductance (FB-Gm) current-mode driver with a charge-transfer circuit is proposed to achieve ultra-low current drivability (≤ 2 ㎁). By using an FB-Gm current-mode driver, both threshold-voltage and mobility variations can be compensated. In addition, an initialization technique that uses a charge-transfer circuit is proposed to handle an ultra-low current of approximately 2 ㎁ with fast driving speed. The simulation results show that the proposed current-mode driver can compensate for 2 ㎁ of current within 10 ㎲ of one-row time with 10 ㎂/channel of static-current consumption. Here, 1.5 ㏀ of series resistance and 25 pF of shunt capacitance, which represent doublewide ultra XGA (DWUXGA) AMOLED displays, are used for accurate simulation.