Abstract
This paper presents an ac driving pixel circuit for active-matrix
organic light-emitting diode (AMOLED) displays, which is composed of one driving
thin-film transistor (TFT), three switching TFTs and one capacitor. The proposed
pixel circuit can not only make OLED work at the ac driving mode, but also
effectively compensate for the threshold-voltage shift of the driving TFT
and the degradation of OLED. Simulation results show that the nonuniformity
of the proposed pixel circuit is significantly reduced (
$< {{10}}\%$
) with an average
value of 4.2% compared with that of the conventional 2T1C pixel circuit, and
thus, the brightness uniformity of AMOLED displays can be enhanced. Moreover,
a high contrast ratio can be achieved by the proposed pixel circuit due to
no light emitting except for the emission period, as well as a relatively
high aperture ratio due to a small number of components.
© 2013 IEEE
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