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Proceedings Paper

Afocal video-pixel lens for tricolor LEDs
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Paper Abstract

An afocal system keeps parallel any two parallel rays emitted by a pair of point sources. If they have the same intensity at identical angles, this design will ensure that the far-field intensity will be higher than that of the bare sources as well as giving same the intensity to both, so that color balance is preserved. If these sources are of different color, it is possible to mix them in the far field while increasing the intensity in a prescribed way. If a third LED is placed at the midpoint between the other two, its intensity pattern will still be close to the one created for the other two souces. This enables the pixel to color-mix red, green and blue LEDs while increasing their apparent intensity and preserving the color-balance of the video signal across the far field. This enables large active-video screens to redirect and intensify their light towards the audience, instead of just spreading it out uselessly.

Paper Details

Date Published: 20 August 2005
PDF: 11 pages
Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 594203 (20 August 2005); doi: 10.1117/12.620148
Show Author Affiliations
Julio Chaves, Light Prescriptions Innovators (United States)
Juan C. Minano, Light Prescriptions Innovators (United States)
Pablo Benitez, Light Prescriptions Innovators (United States)

Published in SPIE Proceedings Vol. 5942:
Nonimaging Optics and Efficient Illumination Systems II
Roland Winston; R. John Koshel, Editor(s)

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