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Threshold Voltage Compensation Error in Voltage Programmed AMOLED Displays

Accepted version
Peer-reviewed

Repository DOI


Type

Article

Change log

Authors

Bagheri, M 
Zhang, J 
Lee, S 
Ashtiani, S 

Abstract

© 2005-2012 IEEE. A new accurate voltage-programmed pixel circuit for active-matrix organic light-emitting diode (AMOLED) displays is presented. Composed of three TFTs and one storage capacitor, the proposed pixel circuit is implemented both in a-Si and a-IGZO TFT technologies for the same pixel size for fair comparison. The simulation result for the a-Si-based design shows that, during a programming time of {\hbox{90}}μ \hbox{s} , the pixel circuit was able to compensate for a 3 V threshold voltage (V\rm th) shift of the drive TFT with almost no error. In contrast, the a-IGZO-based pixel circuit, has a larger current error (of around 8%), despite its proven three-fold higher speed.

Description

Keywords

Active-matrix organic light-emitting diode (AMOLED), amorphous silicon (a-Si), compensation, oxide thin-film transistor (TFT)

Journal Title

Journal of Display Technology

Conference Name

Journal ISSN

1551-319X
1558-9323

Volume Title

12

Publisher

Institute of Electrical and Electronics Engineers (IEEE)
Sponsorship
Engineering and Physical Sciences Research Council (EP/M013650/1)
Authors thank to the EPSRC under Project EP/M013650/1.