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why no laser beam projection TVs?is it the need for colors R G B?
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From my somewhat limited background in laser technology...The color issues could be overcome. The big issue is controlling the beam. Getting the beams to pass the screen over 15,000 times a second (just to start with) is dificult. The trick with tubes is that relitively simple magnetics can redirect a beam of electrons before it hits the phosphor. With lasers, you have a raw light source. Ever try bending light with amagnet? Redirecting a beam of light is easy with mirrors, but not at the scan rates required for video display.
I've been trying to dream up a way to do it for years.
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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