This work proposes a novel amorphous-indium-gallium-zinc-oxide thin film transistor (a-IGZO TFT) based pixel driver circuitry to compensate for threshold voltage variations of TFTs and OLED current degradations for AMOLED (Active Matrix Organic Light-Emitting Diodes) displays. The proposed circuit uses a three-phase clocking scheme i.e. threshold voltage detection phase, data input phase and emission phase for compensating threshold voltage variations. The circuit has been simulated and verified with cadence spectre using a-IGZO TFT and OLED SPICE models. The proposed circuit is able to maintain the OLED current with a maximum error of 0.68% when the threshold voltage is varied from −3.5 ​V to 3.5 ​V.

这项工作提出了一种新型的基于非晶铟镓锌氧化物薄膜晶体管（a-IGZO TFT）的像素驱动器电路，以补偿TFT的阈值电压变化和AMOLED（有源矩阵有机发光二极管）的OLED电流退化。显示。所提出的电路使用三相时钟方案，即阈值电压检测阶段，数据输入阶段和发射阶段来补偿阈值电压变化。该电路已使用a-IGZO TFT和OLED SPICE模型通过踏频光谱仪进行了仿真和验证。当阈值电压从-3.5 V到3.5 V变化时，所提出的电路能够以6％的最大误差保持OLED电流。