A Low-Power Single-Clock-Driven Scan Driver Using Depletion-Mode a-IGZO TFTs

Abstract

A new low-power scan driver using amorphous In-Ga-Zn-O (a-IGZO) thin-film transistor (TFT) is proposed. The proposed scan driver employs only one-clock signal and connects power supply voltage to the drain node of pull-up TFTs in the output stage to reduce the power consumption. The measured power consumption of the proposed scan driver of ten stages is 265 mu W at an output voltage of 20 V and a clock frequency of 46.1 kHz, which is the driving condition of the extended graphics array (1024 x 768) panel. The power consumption is less than 11.9% of the previously reported results.