Threshold Voltage Compensation Error in Voltage Programmed AMOLED Displays
Threshold Voltage Compensation Error in Voltage Programmed AMOLED Displays
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DOI：
10.1109/jdt.2016.2530784
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发表时间：
2016-06-01
影响因子：
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通讯作者：
Nathan, Arokia
中科院分区：
文献类型：
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作者：
Bagheri, Mojtaba;Cheng, Xiang;Nathan, Arokia
提出了一种新的用于有源矩阵有机发光二极管（AMOLED）显示器的精确电压编程像素电路。该像素电路由三个TFT和一个存储电容组成，采用a-Si和a-IGZO TFT技术实现相同像素尺寸的公平比较。基于a-Si的设计的模拟结果表明，在90 μ s的编程时间期间，像素电路能够几乎没有误差地补偿驱动TFT的3V阈值电压（V-th）偏移。相比之下，基于a-IGZO的像素电路具有更大的电流误差（约8%），尽管其速度被证明是三倍。
A new accurate voltage-programmed pixel circuit for active-matrix organic light-emitting diode (AMOLED) displays is presented. Composed of three TFTs and one storage capacitor, the proposed pixel circuit is implemented both in a-Si and a-IGZO TFT technologies for the same pixel size for fair comparison. The simulation result for the a-Si-based design shows that, during a programming time of 90 mu s, the pixel circuit was able to compensate for a 3 V threshold voltage (V-th) shift of the drive TFT with almost no error. In contrast, the a-IGZO-based pixel circuit, has a larger current error (of around 8%), despite its proven three-fold higher speed.