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Proceedings Paper

Requirements on LEDs for advanced optical systems
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Paper Abstract

The use of LEDs in advanced optical systems such as LED projectors or automotive headlamps is usually limited by the optical extend of the light source. The optical extend (or étendue) is defined as the product of the optical area and the divergence angle of the emission. In our paper, we discuss the consequences of such limitations on the design and performance of optical systems. The system optimization involves the chip technology, package design and the primary optics, producing an optical extend that has to match with the optical extend of the imager component. It will be shown how these optical laws put constraints on the LED light source and the design of suitable light engines. The benefits of LED light sources for the above mentioned applications will also be demonstrated.

Paper Details

Date Published: 13 February 2007
PDF: 11 pages
Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 64860Z (13 February 2007); doi: 10.1117/12.696128
Show Author Affiliations
Joachim Reill, Osram Opto Semiconductors GmbH (Germany)
Alexander Wilm, Osram Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 6486:
Light-Emitting Diodes: Research, Manufacturing, and Applications XI
Klaus P. Streubel; Heonsu Jeon, Editor(s)

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