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In Reply to: Re: why no laser beam projection TVs? posted by SSF on March 10, 2001 at 16:14:56:
I think Texas Instruments' Digital Light Projector does this - not with a laser or anything, but with hundreds of thousands of tiny mirrors located on a silicon chip. The mirrors can be "turned on", i.e. rotated into a reflecting mode up to 50,000 times per second by using static electricity. They now have digital projectors using this technology in a few movie theaters (and multimedia projectors and rear projection tvs).The way it works is you shine a really bright light on the chip - each mirror is responsible for a single pixel - by varying the number of times the mirror "turns on" every frame, you can control the brightness of each pixel. For the professional movie theater setup, they use three really big chips - one each for RGB. Smaller commercial models use one smaller chip and a color wheel that spins at about 5000 RPM, flashing RGB on the single chip.
You can also do this with a process called Liquid Crystal on Silicon - where you have a layer of liquid crystal on a silicon chip. When you run current through individual liquid crystal sectors, they become reflective, just like the TI mirrors.
I guess you could use this technology with a wide-beamed laser of some sort, but it probably wouldn't be any better than plain light.
(I'm a newbie here, so no flames if this is widely known technology. I guess I violated rule #1: lurk before you post. My bad)
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Follow Ups
- I think Texas Instruments' DLP does this - Thunder 00:10:21 03/16/01 (0)
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