A new 4T0.5C AMOLED pixel circuit with reverse bias to alleviate OLED degradation

Kuei Yu Lee*, Yen Ping Hsu, Chang-Po Chao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A new 4T0.5C circuit is proposed to achieve a high-resolution active-matrix organic light-emitting diode (OLED) display with the capability of alleviating OLED degradation, while the panel nonuniformity is compensated by an already-proposed system. The designed circuit is built on two adjacent pixels with eight transistors and one capacitor, thus equivalently as a 4T0.5C pixel circuit in occupied layout area. In this circuit, a single storage capacitor is shared by the two adjacent pixels to minimize the entire layout area. The minimized pixel size is compatible to a conventional 2T1C pixel circuit. Along with this 4T0.5C circuit, a new alternative drive scheme is developed to address the panel. The scheme offers the function of automatic reverse biasing on OLEDs to alleviate degradation. The designed circuit is fabricated, and the performance of OLED degradation is successfully validated.

Original languageEnglish
Article number6203355
Pages (from-to)1024-1026
Number of pages3
JournalIEEE Electron Device Letters
Issue number7
StatePublished - 29 May 2012


  • Active-matrix organic light-emitting diode (AMOLED)
  • degradation
  • reverse bias

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