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- Xref: sparky sci.electronics:13458 rec.video:9682
- Newsgroups: sci.electronics,rec.video
- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!boulder!ucsu!spot.Colorado.EDU!weverka
- From: weverka@spot.Colorado.EDU (Robert T. Weverka)
- Subject: Optically scanned TV (was Re: Blue Lasers)
- Message-ID: <1992Jul28.123009.2910@ucsu.Colorado.EDU>
- Sender: news@ucsu.Colorado.EDU (USENET News System)
- Nntp-Posting-Host: spot.colorado.edu
- Organization: University of Colorado, Boulder
- References: <Bs26IL.GwE@news.cso.uiuc.edu> <1myx_6m@rpi.edu>
- Date: Tue, 28 Jul 1992 12:30:09 GMT
- Lines: 33
-
- In article <1myx_6m@rpi.edu> ncc1701@acm.rpi.edu writes:
- >tmkk@uiuc.edu (Khan) writes:
- >
- >>I heard a brief tidbit in one of the popular media about (IBM?)
- >>inventing a blue laser, making extremely high resolution laser
- >>projection TVs possible by using a red, a green, and a blue laser in
- >>combination. Ultra high res, no visible pixels, etc. etc. Sounds like a
- >>videophile's dream come true. Anyone know any more about this new
- >>development? Will it make LCD light valve projectors obsolete before
- >>they even get to market en masse?
- >
- The Argon Ion laser is often used for blue. One watt of optical power
- for onley $20,000.
-
- >Hmm...I doubt it. A couple of friends and I built a laser-sourced
- >projection TV in college (red only) and had tremendous problems in
- >controlling flicker. We could get rid of it, but only at the
- >expense of a jittery picture and almost NO brightness, or lotsa
- >brightness, stable picture, and LOTS of flicker.
- >I doubt lasers will be a viable alternative until there is some method
- >of building very fast scanning apparatus and make them fail-safe as
- >well. (You'd need powerful lasers for decent brightness in a
- >naturally lit room, and if your scanning device fails, you're
- >liable to burn a hole in the wall or someone's eyes...)
- >
- Research in optically scanned TV dates back some 40 years.
- -before the laser. There was a lot of renewed interest with the
- invention of the laser. Fast scanning was done with acoustooptics.
-
- The difficulty is the optical power needed is about 50 watts.
- That doesn't come cheap for a laser.
- -ted
-
-