19 October 2012 LED illuminator for a microdisplay projector
Author Affiliations +
Proceedings Volume 8487, Novel Optical Systems Design and Optimization XV; 848707 (2012); doi: 10.1117/12.928453
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States
Abstract
An illumination system for a microdisplay projector with a two-step imaging system is described here. In the first step, an imaging condenser creates an image of the LED at the color combiner entrance window. In the second step, we relay the image of the integrator exit window onto the micro-display. The illuminator demonstrates high collection efficiency, small footprint, and efficient mixing of light from RGB LEDs that provides required uniformity. A variety of approaches to collecting light emitted from LEDs of various types are compared, leading to the two-step design. A design example using a 0.55” diagonal DLP-based optical engine is presented with the following characteristics: Footprint: 3.9”x3.3”x2.0” (25.7 cubic inches) Light output: 338 white lumens Efficiency: 4.7 lm/watt
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Simon Magarill, "LED illuminator for a microdisplay projector", Proc. SPIE 8487, Novel Optical Systems Design and Optimization XV, 848707 (19 October 2012); doi: 10.1117/12.928453; https://doi.org/10.1117/12.928453
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KEYWORDS
Light emitting diodes

Fiber optic illuminators

Mirrors

Projection systems

Imaging systems

Coating

Relays

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