Dual-output compact gate driver circuit design with embedded combinational logic for oxide TFT-based AMOLED displays

Abstract

This paper presents a gate driver on array (GOA) circuit capable of generating both scan and emission (EM) signals using only a single clock-set for oxide thin-film transistor (TFT)-based active-matrix organic light-emitting diode (AMOLED) displays. By embedding a combinational logic module, the generation of EM signal does not require any additional clock-sets or start signals. This significantly reduces the complexity of external driving circuits and decreases the power consumption. Furthermore, a dual-negative power supply is employed to address the stability issues caused by negative threshold voltage. The proposed gate driver has been fabricated and verified through measurements. For a medium-sized AMOLED display with a resolution of 2560 × 1440 (QHD) and resistance–capacitance (R-C) load of 3 kΩ and 120 pF, the power consumption is only 42.72mW for 1440 gate driver circuits of 120 Hz refresh rate.