Abstract
This work presents a new external driving scheme that
uses the current feedback method with a 3T1C pixel circuit. The proposed circuit
provides a stable OLED driving current by compensating for the threshold voltage
shift of amorphous-silicon thin-film transistors (a-Si TFTs). For fabricated
a-Si TFTs and the 0.35
$\mu$
m CMOS process associated with the proposed driving scheme, measurements
reveal that the normalized OLED current degradation is less than 5% after
60 hours of operation at 60
$^{\circ}$
C. Moreover, for a data line load of 1.69 K
$\Omega$
/110 pF, the relative error rates
between data currents and OLED currents are less than 4% within a settling
time of 19
$\mu{{s}}$
.
© 2013 IEEE
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