Title :
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.
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 VT 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 VT. 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;
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
DOI :
10.1109/CICC.2006.320873
