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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 9, Iss. 10 — Oct. 1, 2013
  • pp: 783–786

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

Chih-Lung Lin, Fu-Chieh Chang, Po-Chun Lai, Po-Syun Chen, and Wen-Yen Chang

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


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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

Citation
Chih-Lung Lin, Fu-Chieh Chang, Po-Chun Lai, Po-Syun Chen, and Wen-Yen Chang, "A Charge-Pump-Based Current Feedback Method for AMOLED Displays," J. Display Technol. 9, 783-786 (2013)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-9-10-783


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