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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