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Amorphous Silicon Display Backplanes on Plastic Substrates

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6 Author(s)
Striakhilev, D. ; Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont. ; Nathan, A. ; Vygranenko, Yuri ; Servati, P.
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Amorphous silicon (a-Si) thin-film transistor (TFT) backplanes are very promising for active-matrix organic light-emitting diode displays (AMOLEDs) on plastic. The technology benefits from a large manufacturing base, simple fabrication process, and low production cost. The concern lies in the instability of the TFTs threshold voltage (VT) and its low device mobility. Although VT-instability can be compensated by means of advanced multi-transistor pixel circuits, the lifetime of the display is still dependent on the TFT process quality and bias conditions. A-Si TFTs with field-effect mobility of 1.1 cm2/Vmiddots and pixel driver circuits have been fabricated on plastic substrates at 150 degC. The circuits are characterized in terms of current drive capability and long-term stability of operation. The results demonstrate sufficient and stable current delivery and the ability of the backplane on plastic to meet AMOLED requirements

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Display Technology, Journal of  (Volume:2 ,  Issue: 4 )