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At the Projection Summit 2003, Lumileds Lighting (San Jose, CA)
(www.lumileds.com) took
the opportunity to showcase a prototype LED-based "pocket
projector." While not quite pocket sized, and quite dim,
it is nonetheless an early prototype that will lead to more impressive
system later.
The pocket projector described
by Gerard Harbers, advanced development manager at LumiLeds,
measured 6 x 3 x 1 inch. However, the size was mainly determined
by off the shelf electronics that were used as an expedient.
The illumination source was a single 3W white LED powered
by four AAA rechargeable batteries, which will run the projector
for half an hour when batteries are fully charged.
The unit projector used a Sony (Osaka, Japan) (www.sony.net)
HTPS 800 x 225 resolution, 0.44-inch diagonal microdisplay
(LCX033AN), which has a transmission efficiency of only 4%.
Lumileds has built several versions of LCD-based projectors
the best of which produces only a few lumens. The output would
be about 6-lumens for a black and white version. A MEMs version
pocket projector would have a 15-lumen output for the same
illumination source.
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In the table we show the required flux in
lumens for a particular projection size and luminance. Lumileds
target specifications for a pocket projector are a 5 to
15-inch diagonal projected image and a brightness of 100
nits, which would be equivalent to a notebook computer display.An
LCD version would be good enough up to a 5-inch diagonal
projected image while a MEMs version would be able to do
a letter size format.
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Contact:
Insight Media
Annmarie Gabisch, 203-831-8464
annmarie@insightmedia.info
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