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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 4, Iss. 1 — Mar. 1, 2008
  • pp: 54–60

A Novel Voltage-Feedback Pixel Circuit for AMOLED Displays

Chih-Lung Lin, Tsung-Ting Tsai, and Yung-Chih Chen

Journal of Display Technology, Vol. 4, Issue 1, pp. 54-60 (2008)


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Abstract

This study presents a novel voltage-modulated pixel circuit for active-matrix organic light-emitting diode (AMOLED) consisting of five n-type thin-film transistors (TFTs), one additional control signal, and one storage capacitor. The proposed circuit, which can be implemented in all-n-type and all-p-type low temperature poly-silicon (LTPS) TFT technologies, successfully compensates for threshold voltage deviation of TFTs and facilitates correction of OLED degradation using a voltage feedback method. Simulation and experimental results for all-n-type TFTs indicate that the proposed pixel circuit reduced the nonuniformity brightness problem effectively by compensating for threshold voltage variation in TFTs and reduced the degradation of emission efficiency in OLEDs.

© 2007 IEEE

Citation
Chih-Lung Lin, Tsung-Ting Tsai, and Yung-Chih Chen, "A Novel Voltage-Feedback Pixel Circuit for AMOLED Displays," J. Display Technol. 4, 54-60 (2008)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-4-1-54

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