Abstract
The variation and reliability issues of display backplane pose major challenges for poly
silicon (poly-Si) active matrix organic light-emitting diode (AMOLED) displays. Adjacent poly-Si
thin-film transistors (TFTs) exhibit different threshold voltages and mobilities due to random
distribution of grain boundaries (GBs). Furthermore, the threshold voltage and mobility of TFTs
have noticeable shift in time because of electrical stress. In this study, we propose an improved
voltage programming pixel circuit for compensating the shift of threshold voltage and mobility in
driver TFTs (DTFTs) as well as compensating the supply voltage degradation. HSPICE simulation
results demonstrate that the drive current for OLED has a deviation of less than
$\pm$
2% for a mobility variation of
$\pm$
40% and a maximum deviation of 30 nA when the threshold voltage varies from 0.3
to
$-$
0.3 V. Moreover, if the supply voltage degrades from 10 to 8.5 V, the drive
current shift is less than 15%.
© 2014 IEEE
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