Backlight illumination design using constant extinction
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Jörg Baumgart
Jörg Baumgart received a Dipl.-Ing. (FH) degree in Physics from the Rhein Main University of Applied Sciences in Rüsselheim and a Dipl.-Ing. (TU) degree in Mechanical Engineering from the Technical University of Ilmenau. This was also where he received his Dr-.Ing. Later, he worked as an Optical Engineer and Optical Designer for Diehl BGT Defence in Überlingen. Currently, he is Professor for Technical Optics at the University of Applied Sciences in Ravensburg Weingarten. He is Dean of Studies for Optical Systems Engineering and coordinates the collaborative research center ZAFH LED-OASYS.
Abstract
Light guiding backlights are a good solution to attain ambient or display illuminations. Generally, they are attained using intended macroscopic defects (dots). Their size, shape and density are designed using ray tracing software. Smaller defects have the fascinating feature that they may not be perceived by the eye. Such a light guide will therefore look transparent and undisturbed. However, such microscopic or even nanoscaled defects are well beyond the limitations of geometrical optics and therefore need other approaches for their design. An interesting alternative to surface defects are particles inside the material or a well-defined surface roughness. In contrast to a defect structure, particle densities or surface roughness cannot be changed without difficulty. These may, however, be much more easily manufactured. In this paper, a simple analytical method for the design of such light guides will be presented. This method is compared to the results of commercial software and will be used to design a homogeneous illumination adopting constant particle density inside the material.
About the author
Jörg Baumgart received a Dipl.-Ing. (FH) degree in Physics from the Rhein Main University of Applied Sciences in Rüsselheim and a Dipl.-Ing. (TU) degree in Mechanical Engineering from the Technical University of Ilmenau. This was also where he received his Dr-.Ing. Later, he worked as an Optical Engineer and Optical Designer for Diehl BGT Defence in Überlingen. Currently, he is Professor for Technical Optics at the University of Applied Sciences in Ravensburg Weingarten. He is Dean of Studies for Optical Systems Engineering and coordinates the collaborative research center ZAFH LED-OASYS.
This work has been conducted within the Collaborative Center for Applied Research on LEDs (ZAFH LED-OASYS). The author gratefully acknowledges the research grants of the state Baden-Württemberg and the European Union, European Regional Development Fund.
References
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©2013 by THOSS Media & De Gruyter Berlin Boston
Artikel in diesem Heft
- Masthead
- Masthead
- Community
- Interview with Jyrki Saarinen, the new Executive Director of EOS
- Conference Notes
- Conference Calendar
- Topical Issue: Lighting technology
- Editorial
- Lighting technology
- Tutorial
- Extracting light out of LEDs
- Review Articles
- Light shaping for illumination
- Lighting with laser diodes
- Research Articles
- SMS freeforms for illumination
- Backlight illumination design using constant extinction
- Review Article
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Artikel in diesem Heft
- Masthead
- Masthead
- Community
- Interview with Jyrki Saarinen, the new Executive Director of EOS
- Conference Notes
- Conference Calendar
- Topical Issue: Lighting technology
- Editorial
- Lighting technology
- Tutorial
- Extracting light out of LEDs
- Review Articles
- Light shaping for illumination
- Lighting with laser diodes
- Research Articles
- SMS freeforms for illumination
- Backlight illumination design using constant extinction
- Review Article
- Deconvolution for digital in-line holographic microscopy
