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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 9,
  • Issue 10,
  • pp. 783-786
  • (2013)

A Charge-Pump-Based Current Feedback Method for AMOLED Displays

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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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