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
PDF Article
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