A 10-bit Linear R-string DAC Architecture for Mobile Full-HD AMOLED Driver ICs

Abstract

A display driver IC prototype for mobile full-HD AMOLED display is presented. Since full-HD AMOLED display has too short driving time, conventional R-string DAC column driver cannot obtain enough internal settling time. To solve the problem, therefore, a new R-string DAC column driver architecture is proposed, which has much faster settling time with high accuracy. Also, with the architecture, one 8-bit PTL in conventional R-string DAC is replaced with much smaller two sub-PTLs, decreasing the overall driver area. The measured INL and DNL are 0.49 LSB and 0.38 LSB, respectively. The mean and maximum value of inter-channel DVO is 4.6mV and 7mV, respectively. The proposed linear 10-bit DAC fabricated on 90-nm CMOS process occupies 81% of conventional nonlinear 8-bit R-string DAC area in the same technology.