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An AMOLED Pixel Circuit With a Compensating Scheme for Variations in Subthreshol
提出一种用于高分辨率AMOLED显示的低灰度阈值电压和亚阈值斜率补偿像素电路。
OLED电流误差在64和128灰度级分别从±3.5/±6.5降至±2.0/±0.8 LSB
AMOLED像素电路阈值电压补偿亚阈值斜率OLED电流误差
▸通过延长二极管连接方案的补偿时间，减少驱动TFT阈值电压和亚阈值斜率变化的影响
▸采用两个电容并联连接驱动TFT栅极节点，增加总存储电容值
▸深入分析并解决了ELVDD IR压降和寄生电容串扰引起的OLED电流误差
Abstract
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 capac-
itors, 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 compe