Design of new collection systems for multi LED light engines

Details Design of new collection systems for multi LED light engines Design of new collection systems for multi LED light engines

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6196e...4m&link_type=abstract

Photonics in Multimedia. Edited by Tervonen, Ari; Kujawinska, Malgorzata; IJzerman, Wilbert; De Smet, Herbert. Proceedings of

Computer Science

Multimedia

1

Scientific paper

LED based projectors have numerous advantages compared to traditional projectors: they are more compact, exhibit a larger color gamut and a longer lifetime, the supply voltage is lower, the absence of ultra violet, infrared radiation and mercury vapour, etc. Furthermore LED's can switch on and off very rapidly (possibility to pulse them) and they have a high dimming ratio that can be used to improve the contrast. However, there is also an important disadvantage: the optical power per unit of etendue (luminance) of an LED is significantly lower than that of e.g. an UHP-lamp. Because of this and the etendue limitation of the projector (small light valve, f-number projection lens), the projected flux on the screen will not be high. Despite this shortcoming, LED's are still very interesting for low power applications because of their superior properties. However we have to collect the available light flux optimally and combine multiple LED's with high luminance within the available system etendue. In this paper we have studied collection optics that collect the LED flux with high optical efficiency and collimation and reshape the spot in a uniform illuminated rectangle with the sizes of the micro display. We have designed 'Gradually Tapered Light Pipes', 'Elliptical Reflectors' and 'Parabolic Reflectors'. Furthermore we have combined many of these LED/collector combinations to get a high luminance illumination engine for LED based projectors.

Affiliated with

Also associated with

No associations

Rating

Design of new collection systems for multi LED light engines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Design of new collection systems for multi LED light engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Design of new collection systems for multi LED light engines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-932824