Abstract
A new accurate voltage-programmed pixel circuit for active-matrix organic
light-emitting diode (AMOLED) displays is presented. Composed of three TFTs and one
storage capacitor, the proposed pixel circuit is implemented both in a-Si and a-IGZO TFT
technologies for the same pixel size for fair comparison. The simulation result for the
a-Si-based design shows that, during a programming time of
${{90}}~\mu {s}$
, the pixel circuit was able to compensate for a 3 V threshold voltage (
$V_{\rm th}$
) shift of the drive TFT with almost no error. In contrast, the
a-IGZO-based pixel circuit, has a larger current error (of around 8%), despite its
proven three-fold higher speed.
© 2016 OAPA
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