Title :
A novel voltage-programmed pixel circuit with VT-shift compensation for AMOLED displays
Author :
Maofeng Yang ; Papadopoulos, Nikolas P. ; Czang-Ho Lee ; Wong, William S. ; Sachdev, Manoj
Author_Institution :
Univ. of Waterloo, Waterloo, ON, Canada
Abstract :
A novel voltage-programmed pixel circuit using hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs) for active-matrix organic light-emitting diode (AMOLED) displays is proposed. The threshold voltage shift (ΔVT) of the drive TFT due to electrical stress is compensated by the change of gate-to-source voltage (ΔVGS) generated by the ΔVT-dependent charge transfer from the drive TFT to a TFT-based Metal-Insulator-Semiconductor (MIS) capacitor. Another MIS capacitor is used to improve OLED drive currents. Measurement results verify the effectiveness and speed of the proposed pixel circuit.
Keywords :
LED displays; MIS capacitors; amorphous semiconductors; charge exchange; elemental semiconductors; organic light emitting diodes; silicon; stress effects; thin film transistors; AMOLED displays; MIS capacitor; OLED drive currents; Si; TFT-based metal-insulator-semiconductor capacitor; active-matrix organic light-emitting diode display; charge transfer; electrical stress; gate-to-source voltage; hydrogenated amorphous silicon; shift compensation; thin-film transistors; threshold voltage shift; voltage-programmed pixel circuit; Amorphous silicon; Integrated circuit modeling; Logic gates; Organic light emitting diodes; Programming; Stress; Thin film transistors;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2013 IEEE
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2013.6658556
