A low power PWM-capable LTPO gate driver for depletion mode a-IGZO TFTs

This paper proposes a novel low-power gate driver for active-matrix organic light-emitting diode displays utilizing low-temperature polycrystalline silicon oxide (LTPO) technology. The proposed circuit consists of only six thin-film transistors (TFTs) and one capacitor. Power consumption of the proposed driver is significantly reduced by ensuring all amorphous indium-gallium-zinc-oxide TFTs are completely turned off even in depletion mode. Furthermore, the circuit supports pulse-width modulation (PWM) driving, enabling it to generate either short-pulse or long-pulse emission signals. Simulation results show that the proposed driver maintains stable operation and low-power consumption under various pulse widths and threshold voltage variations. Notably, the proposed circuit achieves up to a 99.1% reduction in power consumption compared to conventional PWM-capable circuit in depletion mode, making it a promising solution for high-resolution and power-efficient mobile displays.