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Proceedings Paper

Micro-optical beam-shaper for tailoring light emission from OLEDs
Author(s): Michael Flämmich; Dirk Michaelis; Norbert Danz; Christoph A. Wächter; Peter Dannberg; Andreas H. Bräuer
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Paper Abstract

In this contribution, we show that micro-optical elements are well suited to exploit the potential of organic light-emitting diode (OLED) based light sources. They may not only increase the OLED efficiency significantly but also enable for tailoring the common Lambertian-like emission pattern of OLEDs in order to reach desired light distributions corresponding to application demands. An OLED beam-shaping scheme is demonstrated utilizing thin micro-optical arrays where each channel consists of a half-ball lens and an adapted reflective/absorptive aperture. The combination of (a) light recycling, (b) distorted and arrayed imaging of the apertures, and (c) potential substrate-mode-outcoupling allows for efficient tailoring the light emission pattern of large area OLEDs. By means of such a beam-shaping concept, several different illumination patterns (e.g. circular, triangular beams or even more complex light distributions like letters) with various divergence angles below ±40° are demonstrated. Furthermore, a reduction of the divergence angle down to about ±10° accompanied by a stray light level minimization to <1% at larger angles is presented. In either case, intensity enhancements by a factor of >2 can be realized while the thickness of the optics remains below 2 mm.

Paper Details

Date Published: 13 May 2010
PDF: 10 pages
Proc. SPIE 7716, Micro-Optics 2010, 771616 (13 May 2010); doi: 10.1117/12.853871
Show Author Affiliations
Michael Flämmich, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Dirk Michaelis, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Norbert Danz, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Christoph A. Wächter, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Peter Dannberg, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Andreas H. Bräuer, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)


Published in SPIE Proceedings Vol. 7716:
Micro-Optics 2010
Hugo Thienpont; Peter Van Daele; Jürgen Mohr; Hans Zappe, Editor(s)

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