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Design of Organic TFT Pixel Electrode Circuit for Active-Matrix OLED Displays

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Author(s): Aram Shin | Sang Jun Hwang | Seung Woo Yu | Man Young Sung

Journal: Journal of Computers
ISSN 1796-203X

Volume: 3;
Issue: 3;
Start page: 1;
Date: 2008;
Original page

Keywords: active-matrix organic light-emitting diode (AM-OLED) | organic thin-film transistor (OTFT) | pixel circuit | current-programming | SPICE | simulation analysis

ABSTRACT
A new current-programming pixel circuit for active-matrix organic light-emitting diode (AM-OLED) displays, composed of four organic thin-film transistors (OTFTs) and one capacitor, has been designed, simulated and evaluated. The most critical issue in realizing AMOLED displays with OTFTs is the variation and aging of the driving-TFTs and degradation of OLEDs. This can cause image sticking or degradation of image quality. These problems require compensation methods for high-quality display applications, and pixel level approach is considered to be one of the most important factors for improving display image quality. Our design shows that the current OLED and OTFT technology can be implemented for AMOLED displays, compensating the degradation of OTFT device characteristics.
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