13 May 2010 Micro-optical beam-shaper for tailoring light emission from OLEDs
Author Affiliations +
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Flämmich, Michael Flämmich, Dirk Michaelis, Dirk Michaelis, Norbert Danz, Norbert Danz, Christoph A. Wächter, Christoph A. Wächter, Peter Dannberg, Peter Dannberg, Andreas H. Bräuer, Andreas H. Bräuer, } "Micro-optical beam-shaper for tailoring light emission from OLEDs", Proc. SPIE 7716, Micro-Optics 2010, 771616 (13 May 2010); doi: 10.1117/12.853871; https://doi.org/10.1117/12.853871
PROCEEDINGS
10 PAGES


SHARE
Back to Top