8 March 2016 LED light engine concept with ultra-high scalable luminance
Author Affiliations +
Although LEDs have been introduced successfully in many general lighting applications during the past decade, high brightness light source applications are still suffering from the limited luminance of LEDs. High power LEDs are generally limited in luminance to ca 100 Mnit (108 lm/m2sr) or less, while dedicated devices for projection may achieve luminance values up to ca 300 Mnit with phosphor converted green. In particular for high luminous flux applications with limited étendue, like in front projection systems, only very modest luminous flux values in the beam can be achieved with LEDs compared to systems based on discharge lamps. In this paper we introduce a light engine concept based on a light converter rod pumped with blue LEDs that breaks through the étendue and brightness limits of LEDs, enabling LED light source luminance values that are more than 4 times higher than what can be achieved with LEDs so far. In LED front projection systems, green LEDs are the main limiting factor. With our green light emitting modules, peak luminance values well above 1.2 Gnit have been achieved, enabling doubling of the screen brightness of LED based DLP projection systems, and even more when this technology is applied to other colors as well. This light source concept, introduced as the ColorSpark High Lumen Density (HLD) LED technology, enables a breakthrough in the performance of LED-based light engines not only for projection, where >2700 ANSI lm was demonstrated, but for a wide variety of high brightness applications.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christoph Hoelen, Christoph Hoelen, Dick de Boer, Dick de Boer, Dominique Bruls, Dominique Bruls, Joost van der Eyden, Joost van der Eyden, Rolf Koole, Rolf Koole, Yun Li, Yun Li, Mo Mirsadeghi, Mo Mirsadeghi, Vincent Vanbroekhoven, Vincent Vanbroekhoven, John-John Van den Bergh, John-John Van den Bergh, Patrick Van de Voorde, Patrick Van de Voorde, "LED light engine concept with ultra-high scalable luminance", Proc. SPIE 9768, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX, 976810 (8 March 2016); doi: 10.1117/12.2224042; https://doi.org/10.1117/12.2224042


Progress in extremely high brightness LED-based light sources
Proceedings of SPIE (September 05 2017)
Is solid state the future of lighting?
Proceedings of SPIE (January 25 2004)
An LED multiplexer with improved efficiency
Proceedings of SPIE (September 22 2008)
Requirements on LEDs for advanced optical systems
Proceedings of SPIE (February 12 2007)
Polyplanar optical display electronics
Proceedings of SPIE (June 30 1997)
Optical concept for an active headlamp with a DMD array
Proceedings of SPIE (April 27 2008)

Back to Top