An ambient-light sensor system with startup correction for LTPS-TFT LCD

Abstract

An ambient-light sensor system using low-temperature poly-silicon thin film transistors was studied, to reduce the power consumption of mobile applications. The proposed system with startup correction can correct the panel-to-panel variation of the ambient-light sensors, without additional equipment. The digital output of the readout circuit has 8 levels per decade for the input luminance ranges from 100 to 10000lux, and the readout rate is 40Hz. The proposed method provides maximum differential non-uniformity below 0.3 LSB.