Title
Design Methodology For High Brightness Projectors
Keywords
Geometrical optics; Light-emitting diode (LED) displays; Lighting; Liquid-crystal displays; Photometry
Abstract
The low luminance levels of light-emitting diodes (LEDs) compared to arc lamps make it difficult to design high-brightness LED-based projectors. Besides, the specificities of LEDs do not always allow using the same design schemes as with arc lamp-based projection displays. This paper performs a taxonomy of the techniques that can be used to increase the brightness of LED-based projection displays. We show that, in étendue-limited systems, the perceived brightness depends on the system étendue limit, the efficiency of the light engine, and the source luminance. The ability to improve each of these parameters depends on the design constraints. The system étendue limit can be increased at the expense of bulkier, more complex, and more expensive designs. The light engine efficiency can be increased by using free-form shape components adapted to the shapes and the emission patterns of the considered LEDs. The apparent source luminance can be increased at the expense of the flux by either recycling light or restricting the light collection to a smaller étendue with higher average luminance. Luminance can also be increased by using multiple color primaries (spatial multiplexing) or pulsed LEDs (temporal multiplexing). Finally, we review how light recycling can be implemented to convert polarization without increasing étendue. © 2007 IEEE.
Publication Date
3-1-2008
Publication Title
IEEE/OSA Journal of Display Technology
Volume
4
Issue
1
Number of Pages
86-91
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1109/JDT.2007.907110
Copyright Status
Unknown
Socpus ID
43649083179 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/43649083179
STARS Citation
Fournier, Florian and Rolland, Jannick, "Design Methodology For High Brightness Projectors" (2008). Scopus Export 2000s. 10704.
https://stars.library.ucf.edu/scopus2000/10704