부산대학교 도서관

A compact low-voltage segmented digital to analog (D/A) converter with adjustable gamma correction coefficient is proposed for source drivers of active matrix organic light-emitting diode (AMOLED) displays. The shared resistor-string is separated into several segments. The switching networks for each segmentation could be realized using low-voltage or mediumvoltage transistors. The outputs of the segmented DACs are added up by an analog adder to obtain the final DAC value. Compared to the conventional resistor string DAC (R-DAC) with high-voltage transistors, the proposed D/A converter features the layout area reduction by 84.7%, due to the elimination of high-voltage transistors. The proposed segmented DAC is implemented in an industrial 0.25-μm CMOS technology. The measurement results show that the differential and integral nonlinearity of the proposed D/A converter are 0.21 LSB and 1.31 LSB, respectively, which are significantly lower compared to the previously published high resolution DACs. The deviation of output voltages is also reduced by up to 2.9× compared to the previously published high resolution DACs.