Fig. 1.
(a) Proposed pixel circuit schematic and (b) control signal timing diagram.
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| Citation: |
Xiaofeng Song, Jianguo Luo, Lei Zhou, Lirong Zhang, Weijing Wu, Junbiao Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. Journal of Semiconductors, 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011
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X F Song, J G Luo, L Zhou, L R Zhang, W J Wu, J B Peng. A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays[J]. J. Semicond., 2013, 34(12): 125011. doi: 10.1088/1674-4926/34/12/125011.
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A new poly-Si TFT compensation pixel circuit employing AC driving mode for AMOLED displays
DOI: 10.1088/1674-4926/34/12/125011
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Abstract
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. -
References
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