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.

fYear

2006

fDate

21-24 May 2006

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2006.1692642

Filename

1692642