A 3-TFT current-programmed pixel circuit for AMOLEDs

A 3-TFT current-programmed pixel circuit for AMOLEDs

Current programmed circuits have demonstrated threshold voltage V/sub TH/ 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...

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Veröffentlicht in:IEEE transactions on electron devices 2005-07, Vol.52 (7), p.1514-1518
Hauptverfasser: Ashtiani, S.J., Servati, P., Striakhilev, D., Nathan, A.
Format: Artikel
Sprache:eng
Schlagworte:
Active-matrix organic light-emitting diode (AMOLED)
Amorphous semiconductors
Amorphous silicon
amorphous silicon (a-Si)
Applied sciences
Devices
Display
Driver circuits
Dynamic tests
Dynamics
Electric circuits
Electronics
Exact sciences and technology
Light-emitting diode displays
Light-emitting diodes
Optoelectronic devices
pixel circuit
Pixels
Semiconductor device testing
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silicon
Stability
Thin film transistors
thin-film transistor (TFT)
Transistors
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Beschreibung
Zusammenfassung:Current programmed circuits have demonstrated threshold voltage V/sub TH/ 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 V/sub TH/ 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.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2005.850615