In-Pixel Mobility Compensation Scheme for AMOLED Pixel Circuits

Author

Seok-Jeong Song ; Hyoungsik Nam

Author_Institution

Dept. of Inf. Display, Kyung Hee Univ., Seoul, South Korea

Volume

11

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

209

Lastpage

213

Abstract

This paper demonstrates an in-pixel mobility compensation scheme for AMOLED pixel circuits, which requires only one capacitor and one TFT additionally. The proposed scheme converts the mobility variation into the voltage that is subtracted from the gate voltage of a driving TFT to reduce the current error. The proposed structure is applicable to both n-type and p-type TFT pixel circuits and is robust to the process variation of capacitors because the ratio of two capacitors is utilized. SPICE simulations show that, on average, the current error reduction of 50.1%, 34.9%, and 63.3% is achieved for n-type LTPS TFT, p-type LTPS TFT, and n-type oxide TFT pixel circuits, respectively, compared with a normal pixel circuit without mobility compensation.

Keywords

SPICE; compensation; organic light emitting diodes; thin film transistors; AMOLED pixel circuits; SPICE simulations; capacitor; current error; gate voltage; in-pixel mobility compensation scheme; mobility variation; n-type TFT pixel circuits; p-type TFT pixel circuits; process variation; Active matrix organic light emitting diodes; Capacitance; Capacitors; Logic gates; Thin film transistors; Threshold voltage; AMOLED; TFT; in-pixel mobility compensation; pixel circuit;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2014.2372004

Filename

6962892