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Journal of Display Technology

Journal of Display Technology


  • Vol. 9, Iss. 12 — Dec. 1, 2013
  • pp: 957–964

A Novel Voltage-Programmed Pixel Circuit Utilizing $V_{T}$ -Dependent Charge-Transfer to Improve Stability of AMOLED Display

Maofeng Yang, Nikolas P. Papadopoulos, William S. Wong, and Manoj Sachdev

Journal of Display Technology, Vol. 9, Issue 12, pp. 957-964 (2013)

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A novel voltage-programmed pixel circuit using hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs) for active-matrix organic light-emitting diode (AMOLED) displays is proposed. The threshold voltage shift $(\Delta V_{T})$ of the drive TFT caused by electrical stress is compensated by an incremental gate-to-source voltage $(\Delta V_{GS})$ generated by utilizing the $\Delta V_{T}$ -dependent charge transfer from the drive TFT to a TFT-based metal–insulator–semiconductor (MIS) capacitor. A second MIS capacitor is used to inject positive charge to the gate of the drive TFT to improve the OLED drive current. The non-ideality of the $\Delta V_T$ -compensation, TFT overlap capacitance, programming speed, and OLED degradation are discussed. The effectiveness of the proposed pixel circuit is verified by simulation results.

© 2013 IEEE

Maofeng Yang, Nikolas P. Papadopoulos, William S. Wong, and Manoj Sachdev, "A Novel Voltage-Programmed Pixel Circuit Utilizing $V_{T}$ -Dependent Charge-Transfer to Improve Stability of AMOLED Display," J. Display Technol. 9, 957-964 (2013)

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