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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 2,
  • Issue 4,
  • pp. 364-371
  • (2006)

Amorphous Silicon Display Backplanes on Plastic Substrates

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Abstract

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 (V<sub>T</sub>) and its low device mobility. Although V<sub>T</sub>-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 cm<sup>2</sup>/V · s and pixel driver circuits have been fabricated on plastic substrates at 150 °C. 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.

© 2006 IEEE

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