Current Feedback Compensation Circuit for 2T1C LED Displays: Method

Author

Charisoulis, Thomas ; Frey, Douglas ; Hatalis, Miltiadis K.

Author_Institution

Dept. of Electr. & Comput. Eng., Lehigh Univ., Bethlehem, PA, USA

Volume

62

Issue

10

fYear

2015

Firstpage

2423

Lastpage

2433

Abstract

A novel current feedback programming principle and circuit architecture are presented, compatible with LED displays utilizing the 2T1C pixel structure. The new pixel programming approach is compatible with all TFT backplane technologies and can compensate for non-uniformities in both threshold voltage and carrier mobility of the OLED pixel drive TFT, due to a feedback loop that modulates the gate of the driving transistor according to the OLED current. The circuit can be internal or external to the integrated display data driver. Based on simulations and data gathered through a fabricated prototype driver, a pixel drive current of 20 nA can be programmed within an addressing time ranging from 10 μs to 50 μs.

Keywords

LED displays; carrier mobility; circuit feedback; driver circuits; organic light emitting diodes; thin film transistors; 2T1C LED display; OLED pixel drive TFT; TFT backplane technology; carrier mobility; current 20 nA; current feedback compensation circuit; current feedback programming principle; driving transistor; feedback loop; integrated display data driver; organic light emitting diode; pixel drive current; pixel programming approach; thin film transistor; threshold voltage; time 10 mus; time 10 mus to 50 mus; Capacitors; Impedance; Programming; Sensors; Switches; Thin film transistors; 2T1C pixel; AMOLED; current feedback; mobility compensation circuit; threshold voltage compensation circuit;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2015.2468999

Filename

7277153