Esato

Holograms Enable Pocket Projectors

1 July 2004 by axxxr
Researchers from Cambridge and Light Blue Optics, Ltd. have developed a prototype pocket-sized, battery-powered video projector.This is one step closer to starwars hologram technology.And can be easily be fitted into future mobiles phones and pda's.

The trick is a total lack of lenses or light bulbs, but instead to display a two-dimensional hologram on a microdisplay then shine a laser through it, which scatters the light into a larger, projected picture.This technology in future can easily be incoperated into cellphones or PDAs, there would be no need for roll-up screens or dorky mirrorshade HUDs at all. All you'd need is a clean wall and a total blotting out of the star we call our sun.

Conventional digital video projectors form images by generating a small picture on a transparent microdisplay inside the projector, then shining a high-power light through the microdisplay to a large magnifying lens.

In the researchers' design, a two-dimensional hologram is shown on the microdisplay rather than an image, and the projected image is formed by shining a laser beam through the microdisplay, which scatters the light into a particular pattern. No lenses are required.

The researchers were able to do this fast enough to project video by finding and exploiting a quirk of the human vision system. They found that variation affects people's perception of video quality more than the level of noise.

Pocket-sized video projectors could become practical in two to five years, according to the researchers. They presented the work at the Society for Information Display (SID) International Symposium 2004 in Seattle, Washington, May 23 to 28.





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