Abstract
A scheme of driving active matrix organic light emitting diode (AMOLED)
displays with hydrogenated amorphous silicon (a-Si) thin-film transistors
(TFTs) is presented. By sending a feedback voltage from each pixel to a column
driver during the programming cycle, the driving scheme can compensate for
the instability of the TFTs, in particular, the shift in the threshold voltage.
Measurement results show no change in the OLED current in the presence of
a 1.3-V shift in the threshold voltage. Based on circuit analysis, a simple
lead compensator and an accelerating pulse were employed to achieve fast pixel
programming for a wide range of OLED currents. Simulation results show a programming
time of less than 70 μs for OLED currents as low as 50 nA.
© 2006 IEEE
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