22 February 2006 LEDs on the threshold for use in projection systems: challenges, limitations, and applications
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Abstract
The use of coloured LEDs as light sources in digital projectors depends on an optimal combination of optical, electrical and thermal parameters to meet the performance and cost targets needed to enable these products to compete in the marketplace. This paper describes the system design methodology for a digital micromirror display (DMD) based optical engine using LEDs as the light source, starting at the basic physical and geometrical parameters of the DMD and other optical elements through characterization of the LEDs to optimizing the system performance by determining optimal driving conditions. The main challenge in using LEDs is the luminous flux density, which is just at the threshold of acceptance in projection systems and thus only a fully optimized optical system with a uniformly bright set of LEDs can be used. As a result of this work we have developed two applications: a compact pocket projector and a rear projection television.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bryce Anton Moffat, Bryce Anton Moffat, } "LEDs on the threshold for use in projection systems: challenges, limitations, and applications", Proc. SPIE 6134, Light-Emitting Diodes: Research, Manufacturing, and Applications X, 613406 (22 February 2006); doi: 10.1117/12.661561; https://doi.org/10.1117/12.661561
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