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Proceedings Paper

Poly-Si driving circuits for organic EL displays
Author(s): Simon W.-B. Tam; Yojiro Matsueda; Mutsumi Kimura; Hiroshi Maeda; Tatsuya Shimoda; Piero Migliorato
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Paper Abstract

In order to realize a fully integrated polycrystalline silicon thin-film transistor organic electro-luminescent display (poly-Si TFT-OELD) with good image quality, problems caused by spatially non-uniform device characteristic in TFTs must be addressed. In TFT-OELDs, spatial variation of threshold voltage in TFT driving circuits leads to non- uniform brightness and poor grayscale accuracy. Consequently, special pixel driver circuits are designed to overcome such difficulties. TFT-OELD analog and digital pixel driver circuits are closely examined and design difficulties are pointed out. For example, in an analog driver circuit, one difficulty is to minimize the power consumption given the spread of (Delta) V(Tau ); whereas in a digital driver circuit, one of the difficulties is how to maximize the number of grayscales. Performance of important circuits are analyzed and compared through circuit simulations using a poly-Si TFT model. Finally, suggestions of grayscale accuracy improvement are made.

Paper Details

Date Published: 30 April 2001
PDF: 9 pages
Proc. SPIE 4295, Flat Panel Display Technology and Display Metrology II, (30 April 2001); doi: 10.1117/12.424867
Show Author Affiliations
Simon W.-B. Tam, Epson Cambridge Lab. (United Kingdom)
Yojiro Matsueda, Base Technology Research Ctr. (Japan)
Mutsumi Kimura, Base Technology Research Ctr. (Japan)
Hiroshi Maeda, Base Technology Research Ctr. (Japan)
Tatsuya Shimoda, Base Technology Research Ctr. (Japan)
Piero Migliorato, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 4295:
Flat Panel Display Technology and Display Metrology II
Edward F. Kelley; Edward F. Kelley; Apostolos T. Voutsas, Editor(s)

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