Super-Bright Pico Projector Just a Quarter-Inch Thick
Posted in: Home Audio and Video, Today's ChiliGerman researchers have managed to shrink a pico projector down to just 6mm thick. That’s less than a quarter-inch. The researchers, from the Fraunhofer Institute for Applied Optics and Precision Engineering, use a new lens-system to make sure that the projected image is bright, even from such a tiny device.
Instead of making the light-source bigger, which would make the projector bigger, they used 45 micro-lenses. Each of these has a 200 x 200 pixel LCD on the back, and the lenses are colored variously in red, green and blue. The images produced by these lenses are combined in an overlapping patchwork to make a bright 800 by 480 pixels image.
The 6 x 6mm box still only puts out 11 lumens of light, whereas the best of today’s already small pico-projectors manage 15 lumens. However, the researchers say that if the unit was scaled up to the size of regular pico projectors, it would pump out 90 lumens, removing the need to use these things in dark rooms.
The quest for ever-smaller projectors means that we will be able to fit them inside cellphones, and Marcel Sieler, the researcher behind this projector is working to reduce his LCD pixels from 8.5 to 3 microns. But what we really need, as anyone who has used a pico projector will tell you, is bigger, brighter images. As it stands these little magic lanterns are little more than neat novelties.
Mini-projectors – maximum performance [Fraunhofer Institute]
An Even Smaller Pocket Projector [Technology Review]
Photo: Fraunhofer Institute
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