• DocumentCode
    742238
  • Title

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

  • Author

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

  • Author_Institution
    Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Waterloo, ON, Canada
  • Volume
    9
  • Issue
    12
  • fYear
    2013
  • Firstpage
    957
  • Lastpage
    964
  • Abstract
    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 (ΔVT) of the drive TFT caused by electrical stress is compensated by an incremental gate-to-source voltage (ΔVGS) generated by utilizing the ΔVT-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 ΔVT-compensation, TFT overlap capacitance, programming speed, and OLED degradation are discussed. The effectiveness of the proposed pixel circuit is verified by simulation results.
  • Keywords
    LED displays; MIS capacitors; charge exchange; circuit stability; compensation; elemental semiconductors; hydrogen; organic light emitting diodes; silicon; thin film transistors; AMOLED display; MIS capacitor; Si:H; TFT overlap capacitance; VT-dependent charge-transfer; active-matrix organic light-emitting diode display; electrical stress compensation; hydrogenated amorphous silicon thin-film transistor; incremental gate-to-source voltage; metal-insulator-semiconductor capacitor; positive charge injection; stability; threshold voltage shift; voltage-programmed pixel circuit; Capacitance; Logic gates; Organic light emitting diodes; Programming; Simulation; Thin film transistors; Threshold voltage; Amorphous silicon (a-Si); active-matrix organic light-emitting diode (AMOLED); aging; compensation; pixel circuit; thin-film transistor (TFT);
  • fLanguage
    English
  • Journal_Title
    Display Technology, Journal of
  • Publisher
    ieee
  • ISSN
    1551-319X
  • Type

    jour

  • DOI
    10.1109/JDT.2013.2275172
  • Filename
    6571244
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=742238