2023-12 IDW '23, Niigata, Japan

IDW '23, Niigata, Japan

December 6 - December 8, 2023 (Wen. - Fri.), TOKI MESSE Niigata Convention Center

Depletion-Mode a-IGZO TFT Pixel Circuit Compensating for Capacitance Deviation and Threshold Voltage Shift

Hyunwoo Kim, Jinho Moon, Yongchan Kim, and Hojin Lee

Abstract

 In this paper, we propose a novel pixel circuit using source follower scheme method compensating for threshold voltage (VTH) shifts of driving TFT (DR TFT) and storage capacitance deviations based on amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs). The proposed pixel circuit is composed of six TFTs and two capacitors. Simulation results confirmed that, when the VTH of the driving TFT and storage capacitance varies up to ±2 V and ±20%, the OLED current error could be suppressed to 5.1%, and 8.0%, respectively.