Innovative Voltage Driving Pixel Circuit Using Organic Thin-Film Transistor for AMOLEDs

Po-Tsun Liu, Li Wei Chu

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


In this work, we propose a novel active-matrix organic light-emitting diode displays (AMOLED) pixel circuit based on organic thin-film transistor (OTFT) architecture, which consisted of four switches, one driving transistor, and a capacitor. The pentacene-based OTFT device possesses a field-effect mobility of 0.1 cm2/V ·s, a threshold voltage of −1.5 V, subthreshold slope of 1.8 V/decade and an on/off current ratio 106. The resultant voltage-driving pixel circuit, named “Complementary Voltage-Induced Coupling Driving” (CVICD), is different from the current-driving scheme and can appropriately operate at low gray level for the low-mobility OTFT circuitry. The current non-uniformity less than 2.9% is achieved for data voltage ranging from 1 to 17 V by SPICE simulation work. In addition, the new external driving method can effectively reduce the complexity of OLED pixel circuitry.

Original languageEnglish
Pages (from-to)224-227
Number of pages5
JournalIEEE/OSA Journal of Display Technology
Issue number6
StatePublished - 1 Jan 2009


  • Active-matrix organic light-emitting diode displays (AMOLEDs)
  • SPICE simulation
  • organic thin-film transistor (OTFT)


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