A Driving Scheme for AMOLED Displays Based on Current Feedback

Author

Ashtiani, Shahin J. ; Nathan, Arokia

Author_Institution

Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont.

fYear

2006

Firstpage

289

Lastpage

292

Abstract

A scheme of driving AMOLED displays with amorphous silicon (a-Si) thin film transistors (TFTs) is presented. By exploiting current feedback, a transresistance amplifier as column driver, and an accelerating current pulse, the driving scheme provides fast programming and low sensitivity of OLED current to shift in V_T in a-Si TFTs. Prototypes of the pixel circuit and the transresistance amplifier were fabricated in an a-Si TFT process and a 0.8-mum 20-V CMOS technology. Measurements show less than 5% change in the OLED current for 2.5 V shift in V_T. Settling times smaller than 70 mus were achieved for programming currents as small as 100 nA

Keywords

CMOS integrated circuits; LED displays; amplifiers; circuit feedback; driver circuits; silicon; thin film transistors; 0.8 micron; 100 nA; 2.5 V; 20 V; AMOLED displays; CMOS technology; Si; current feedback; pixel circuit; thin film transistors; transresistance amplifier; Acceleration; Active matrix organic light emitting diodes; Amorphous silicon; CMOS technology; Driver circuits; Feedback; Flat panel displays; Organic light emitting diodes; Pulse amplifiers; Thin film transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2006. CICC '06. IEEE

Conference_Location

San Jose, CA

Print_ISBN

1-4244-0075-9

Electronic_ISBN

1-4244-0076-7

Type

conf

DOI

10.1109/CICC.2006.320873

Filename

4114961