A 3-TFT current-programmed pixel circuit for AMOLEDs

TitleA 3-TFT current-programmed pixel circuit for AMOLEDs
Publication TypeJournal Article
Year of Publication2005
AuthorsAshtiani, S. J., P. Servati, D. Striakhilev, and A. Nathan
JournalElectron Devices, IEEE Transactions on
Pagination1514 - 1518
Date Publishedjul.
Keywords3-TFT current-programmed pixel circuit, active-matrix organic light-emitting diode, AMOLEDs, amorphous semiconductors, amorphous silicon technology, current degradation, current programmed circuits, driver circuits, LED displays, lifetime tests, OLED drive current, organic light emitting diodes, semiconductor device testing, Si, silicon, thin film transistors, thin-film transistor, threshold voltage shift compensation

Current programmed circuits have demonstrated threshold voltage VTH shift compensation to provide a stable drive current to the organic light-emitting diode (OLED). However, the degree of stability of drive current depends critically on the dynamic behavior of the circuit. This paper examines the dynamic behavior of a 3-TFT current programmed pixel and analyzes the impact of VTH shift on the OLED drive current. The pixel circuit was implemented in amorphous silicon technology and lifetime tests show a 11% current degradation at 700 h.


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