This article proposes an active-matrix organic light-emitting diode (AMOLED) pixel circuit for mobile displays with high resolution to improve the image quality of the display panel. The proposed pixel circuit, which consists of six low-temperature polycrystalline silicon thin-film transistors (TFTs) and two capacitors, compensates for variations in the threshold voltage (Vth) and subthreshold slope (SS) of driving TFTs at low gray levels. Such compensations are achieved by extending the compensation time in the diode-connection scheme, resulting in a reduction in the OLED current error (OCE) of the proposed pixel circuit. In addition, the proposed pixel circuit connects two capacitors in parallel to the gate node of the driving TFT, thus increasing the total storage capacitance value in a given capacitor area in the emission phase, resulting in a reduction in voltage distortion at the gate node. Moreover, the OCEs caused by the IR drop of ELVDD and the crosstalk due to parasitic capacitances are thoroughly investigated and analyzed. The measurement results of the proposed pixel circuit show that the OCEs at the 64th and 128th gray levels are reduced from ±3.5 and ±6.5 to ±2.0 and ±0.8 LSB, respectively, by extending the compensation time from 6.5 to 195 $\mu \text{s}$ . Therefore, the proposed pixel circuit is highly suitable for mobile AMOLED displays requiring high image quality.

中文翻译：

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一种对驱动TFT的亚阈值斜率和阈值电压变化具有补偿方案的AMOLED像素电路

本文提出了一种用于高分辨率移动显示器的有源矩阵有机发光二极管（AMOLED）像素电路，以提高显示面板的图像质量。所提出的像素电路由六个低温多晶硅薄膜晶体管 (TFT) 和两个电容器组成，可补偿低灰度级驱动 TFT 的阈值电压 (Vth) 和亚阈值斜率 (SS) 的变化。这种补偿是通过延长二极管连接方案中的补偿时间来实现的，从而降低了所提出的像素电路的 OLED 电流误差 (OCE)。此外，所提出的像素电路将两个电容器并联连接到驱动TFT的栅极节点，从而增加了发射阶段给定电容器区域内的总存储电容值，从而减少栅极节点处的电压失真。此外，深入研究和分析了由 ELVDD 的 IR 压降引起的 OCE 和寄生电容引起的串扰。所提出的像素电路的测量结果表明，通过将补偿时间从 6.5 延长到 195 美元，第 64 和第 128 灰度级的 OCE 分别从 ±3.5 和 ±6.5 降低到 ±2.0 和 ±0.8 LSB。文本{s}$ 。因此，所提出的像素电路非常适合需要高图像质量的移动 AMOLED 显示器。所提出的像素电路的测量结果表明，通过将补偿时间从 6.5 延长到 195 美元，第 64 和第 128 灰度级的 OCE 分别从 ±3.5 和 ±6.5 降低到 ±2.0 和 ±0.8 LSB。文本{s}$ 。因此，所提出的像素电路非常适合需要高图像质量的移动 AMOLED 显示器。所提出的像素电路的测量结果表明，通过将补偿时间从 6.5 延长到 195 美元，第 64 和第 128 灰度级的 OCE 分别从 ±3.5 和 ±6.5 降低到 ±2.0 和 ±0.8 LSB。文本{s}$ 。因此，所提出的像素电路非常适合需要高图像质量的移动 AMOLED 显示器。