Afocal video-pixel lens for tricolor LEDs

Julio Chaves; Juan C. Minano; Pablo Benitez

doi:10.1117/12.620148

20 August 2005 Afocal video-pixel lens for tricolor LEDs

Julio Chaves, Juan C. Minano, Pablo Benitez

Proceedings Volume 5942, Nonimaging Optics and Efficient Illumination Systems II; 594203 (2005) https://doi.org/10.1117/12.620148
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Julio Chaves, Juan C. Minano, and Pablo Benitez "Afocal video-pixel lens for tricolor LEDs", Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 594203 (20 August 2005); https://doi.org/10.1117/12.620148

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available