A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays

A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays
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一种用于AMOLED显示器的采用交流驱动模式的新型多晶硅TFT补偿像素电路

DOI:
10.1088/1674-4926/34/12/125011
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发表时间:
2013-12
期刊:
Chinese Journal of Semiconductors
影响因子:
--
通讯作者:
Peng Jun-Biao
Peng Jun-Biao
中科院分区:
其他
文献类型:
--
作者:
Zhou Lei;Zhang Li-Rong;Wu Wei-Jing;Peng Jun-Biao

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本文提出了一种新的多晶硅像素电路采用交流驱动模式的有源矩阵有机发光二极管(AMOLED)显示器。建议的像素电路,它由一个驱动薄膜晶体管(TFT),三个开关TFT,和一个存储电容,可以有效地补偿多晶硅的阈值电压变化和OLED的退化。由于除了在发射时段期间之外没有光发射,并且在所提出的像素电路中使用少量器件,所以可以容易地实现高对比度和高像素开口率。SMART-SPICE软件仿真结果表明,该像素电路的OLED电流不均匀性显著降低(< 10%),平均为2.63%,而传统2 T1 C的电流不均匀性为103%。因此,AMOLED显示器的亮度均匀性可以通过使用所提出的像素电路来改善。
This paper presents a new poly-Si pixel circuit employing AC driving mode for active matrix organic light-emitting diode (AMOLED) displays. The proposed pixel circuit, which consists of one driving thin-film transistor (TFT), three switching TFTs, and one storage capacitor, can effectively compensate for the threshold voltage variation in poly-Si and the OLED degradation. As there is no light emission, except for during the emitting period, and a small number of devices used in the proposed pixel circuit, a high contrast ratio and a high pixel aperture ratio can be easily achieved. Simulation results by SMART-SPICE software show that the non-uniformity of the OLED current for the proposed pixel circuit is significantly decreased (< 10%) with an average value of 2.63%, while that of the conventional 2T1C is 103%. Thus the brightness uniformity of AMOLED displays can be improved by using the proposed pixel circuit.
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