A compact-sized 10-bit two-stage DAC for AMOLED column driver ICs

Abstract

An optimized compact-sized 10-bit DAC with one-voltage selector for AMOLED column driver ICs is proposed in this paper. By rearranging the architecture of the switch-capacitor in the proposed design, the number of decoder switches is cut in half. In addition, a compact 8-bit two-stage DAC with two-voltage selector is also presented. The simulation and experiment results show that the column drivers adopting the compact 8-bit DAC and 10-bit DAC occupy only 53.7% and 76.3% of the area required for the driver adopting the conventional 8-bit R-DAC. The measured DNL/INL is 0.44LSB/0.68LSB for the 8-bit DAC and 0.126/0.256LSB for the 10-bit DAC, respectively. Moreover, settling time within 6.43μs is achieved under 1.5kΩ-resistance and 100pF-capacitance load, hence the proposed column driver is suitable for Full-HD AMOLED displays.