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International Journal of Photoenergy
Volume 2011, Article ID 543273, 6 pages
http://dx.doi.org/10.1155/2011/543273
Research Article

An AMOLED AC-Biased Pixel Design Compensating the Threshold Voltage and Drop

1Department of Electronic Engineering, National Taiwan University of Science and Technology, 43 Section 4, Keelung Road, Taipei 106, Taiwan
2Graduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, 43 Section 4, Keelung Road, Taipei 106, Taiwan

Received 23 July 2011; Accepted 1 September 2011

Academic Editor: Raghu N. Bhattacharya

Copyright © 2011 Ching-Lin Fan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a novel pixel design and an AC bias driving method for active-matrix organic light-emitting diode (AM-OLED) displays using low-temperature polycrystalline silicon thin-film transistors (LTPS-TFTs). The proposed threshold voltage and drop compensation circuit, which comprised three transistors and one capacitor, have been verified to supply uniform output current by simulation work using the Automatic Integrated Circuit Modeling Simulation Program with Integrated Circuit Emphasis (AIM-SPICE) simulator. The simulated results demonstrate excellent properties such as low error rate of OLED anode voltage variation (%) and low voltage drop of power line. The proposed pixel circuit effectively enables threshold-voltage-deviation correction of driving TFT and compensates for the voltage drop of power line using AC bias on OLED cathode.