Title :
High-precision, fast current source for large-area current-programmed a-Si flat panels
Author :
Chaji, G.Reza ; Nathan, Arokia
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont.
Abstract :
Although current-programmed pixel circuits lead to a highly stable amorphous silicon (a-Si) active matrix backplane, they are prone to a long settling time due to the large parasitic capacitance coupled with the low mobility of a-Si thin film transistors (TFTs). This paper presents a fast-current source that can significantly improve the settling time of the a-Si active matrix. Also, to reduce the effect of mismatches a differential offset cancellation technique is introduced
Keywords :
amorphous semiconductors; current conveyors; flat panel displays; programmable circuits; silicon; thin film transistors; Si; amorphous silicon active matrix backplane; auto-zeroing; current conveyor; current source; current-programmed a-Si flat panels; current-programmed pixel circuits; offset cancellation; parasitic capacitance; thin film transistors; Active matrix organic light emitting diodes; Amorphous silicon; Backplanes; Coupling circuits; Organic light emitting diodes; Parasitic capacitance; Sensor phenomena and characterization; Thin film transistors; Threshold voltage; X-ray imaging; Current-programmed pixel circuit; auto-zeroing; current conveyor; offset cancellation;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692642
