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Proceedings Paper

Improvement of power efficiency and reduction of blur effect in OLED with micro-lens array films by reducing substrate thickness
Author(s): Chun-Che Ma; Yi-Jiun Chen; Li-Jen Hsiao; Hoang Yan Lin
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Paper Abstract

This study demonstrates that attaching micro-lens array films (MAFs) on the substrate and reducing the substrate thickness of OLED can significantly increase the power efficiency, while simultaneously reduce image blurring. Using a point source model, based on Monte-Carlo ray-tracing method, the power efficiency enhancement and reduction of blur effect are respectively discussed in three different regions of the MAFs attached substrate: partially reflecting region, transmitting region, and light guiding region of micro-lenses. According to the equations, derived with regard to the substrate thickness and the displacement from the point source and based on geometric relations corresponding to different regions, reducing the substrate thickness will result in different levels of enhancement for power efficiency in different regions. By comparing OLED with MAFs and bare OLED, the overall enhancement ratio of power efficiency is 1.46, which can be further improved to 1.78 by reducing the substrate thickness from 700 μm to 50 μm, and the blurlength is reduced from 942 μm to 255 μm. The simulation results demonstrate the possibility of applying MAFs to OLED for higher power efficiency without image degradation in display and lighting applications.

Paper Details

Date Published: 1 May 2014
PDF: 11 pages
Proc. SPIE 9137, Organic Photonics VI, 91370J (1 May 2014); doi: 10.1117/12.2052094
Show Author Affiliations
Chun-Che Ma, National Taiwan Univ. (Taiwan)
Yi-Jiun Chen, National Taiwan Univ. (Taiwan)
Li-Jen Hsiao, National Taiwan Univ. (Taiwan)
Hoang Yan Lin, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9137:
Organic Photonics VI
Barry P. Rand; Chihaya Adachi; David Cheyns; Volker van Elsbergen, Editor(s)

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