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

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5 Author(s)
Chih-Lung Lin ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Fu-Chieh Chang ; Po-Chun Lai ; Po-Syun Chen
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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 μm 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°C. Moreover, for a data line load of 1.69 K Ω/110 pF, the relative error rates between data currents and OLED currents are less than 4% within a settling time of 19 μs.

Published in:

Display Technology, Journal of  (Volume:9 ,  Issue: 10 )

Date of Publication:

Oct. 2013

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