Abstract
This study presents a novel voltage-modulated pixel circuit for active-matrix
organic light-emitting diode (AMOLED) consisting of five n-type thin-film
transistors (TFTs), one additional control signal, and one storage capacitor.
The proposed circuit, which can be implemented in all-n-type and all-p-type
low temperature poly-silicon (LTPS) TFT technologies, successfully compensates
for threshold voltage deviation of TFTs and facilitates correction of OLED
degradation using a voltage feedback method. Simulation and experimental results
for all-n-type TFTs indicate that the proposed pixel circuit reduced the nonuniformity
brightness problem effectively by compensating for threshold voltage variation
in TFTs and reduced the degradation of emission efficiency in OLEDs.
© 2007 IEEE
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