A charge-pump-based current feedback method for amoled displays

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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 μ 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 °C. Moreover, for a data line load of 1.69 KΩ110 pF, the relative error rates between data currents and OLED currents are less than 4% within a settling time of 19. μm

Original languageEnglish
Article number6588572
Pages (from-to)783-786
Number of pages4
JournalIEEE/OSA Journal of Display Technology
Issue number10
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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