A 3-TFT Current-Programmed Pixel Circuit for AMOLEDs

摘要

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.