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Thread: Is it possible to make a LASER-TV ?

  1. #1
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    Default Is it possible to make a LASER-TV ?

    Yea...

    Like my LCD projector, there is a light source that is WHITE !
    And one LCD that the light is shining (trow,trough) and the LCD make all the colours.... Yes that is not so hard to understand yes ?

    SOOOh...
    what if the light sourche is ONE laser (3 lasers that is RGB) and then you make a lense that doubled the size of the beam from 0.3mm to 3meeters (at 5meeters from the wall) ..

    Then you 3 difrent LCD screens that ...
    One is Green
    One is Blue
    One is Red !

    They are all black when not in use !
    But like the LCD in the projector, the LCD OPEN example a circle in pixels if it`s a white circle the Red\green and blue LCD open a circle at the same time !
    Then you got a LASER CIRCLE on the wall ? correct ?

    I start thinking about that the red laser can`t shine trough(trow) the green LCD becouse that one is black...
    The solution to that is placing all that 3 lasers and the 3 LCD side by side
    and colliminate it all correctly...

    And as you all know, laser is only many DOTs of light..
    So to make the laser light more stabile (make it more clear and smotly) i planning to rotate the laser at HIGH speed then all the atoms is spinning so fast that you will se it as a smoooooth light on the wall ..
    So well what to you think ?

    se my extremly detailed BMP picure

    Thanx..

    And yea.. i`m know i will be the first person in the wordl creating a LASER-TV-projector tomorrow I`ma rich man ..

    mouuuuhahahahahha

    :twisted: :twisted: :twisted: :twisted:



    full size img:
    http://photonlexicon.com/gallery/Lit...aser_TV?full=1

  2. #2
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    Default

    A company called Laser Creations in the UK made a laser video projector about 5 years ago. It used a 10W white light gas laser and projected moving video onto the sides of buildings.

    It operated as a simple raster scan device, producting rows of coloured pixels at high speed. The system was very expensive but worked quite well.

  3. #3
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    Heres the one I read about a while ago.

    http://www.mitsi.com/Projects/Alp.htm

    Phenomenal technology. I would love to see "under the hood" of this thing. Expecially the 80k rpm motor

    Had a conversation with user:Josh the other day about doing the "same type of thing" with DLP chips.

  4. #4
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    I heard this can be done with LD2000, a polygon Scanner, and a high speed galvo (ie: 6800HP). The Polygon Scanner will give you the fastest horizontal lines, and the galvo provides the vertical. I'm actually working with a friend to put one of these scanheads together for my whitelight. Should be sweet!..

  5. #5
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    Hey Jay:

    Dont get your hopes up... Really.

    http://pangolin.com/LD2000/vst.htm

    It looks 100 times worse in person. A friend was over a few days ago and we played with the system:

    With 6800HP galvos running full tilt you get about 20 horizontal scan lines in a really small scan angle. Even then the galvos sounded pissed off.

    The problem with the polygon scanner is that the frequency shifts so the lines are not where they should be at any given moment. Just because they say 8000RPM doesnt mean its locked at that speed. Anything from temperature to temperment can change the speed +/- 10%

  6. #6
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    Heh... for the effort, I would go with a light valve projector.

    They make them with both 6000-8000W HID arc lamps and lasers too!

    The GE Talarias I run are 15,000 ANSI lumen projectors and will light up
    a building quite nicely. I have 3 sets of optics for various throws, and
    the color saturation is INSANE... This is because the way a light valve
    works is that it uses a linear sheet of flowing oil and uses high voltage
    to change the refraction in the oil to change colors, thus giving you
    true full color saturaion, unlike DLPs and LCD projectors which mix
    RGB for the colors.



    The operation is not for the faint of heart, but neither is the laser field

  7. #7
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    Default

    nice projektor to use on my "home-cinema" :twisted:

    But dont forget, i was NOT talking about using scanners !!!

    Only LCD screen that give the correct output..
    The LCD do all the job...
    The laser is only the light source... but i doupt it will work..


    What about my plan with rotating the laser ?
    Will the dot on the wall be smoother ?
    Or will it be many many tiny dots of lights... (like a laser normally is)

  8. #8
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    Hmm interesting idea...

    Decollimating the beam and running it through the LCD sounds like it would
    work. The brightness may be dissappointing since a 1W laser is about as
    bright as a 10W lightbulb (due to losses in the lightbulb as heat). A slight
    problem is that an LCD blocks color by absorption, so you might suffer
    significant leakage of light if you aren't lucky in the frequency absoption range.

    The other alternative is if you ran through an external scan mechanism
    (which is what, I believe, the laser based light valve systems do) to move the
    laser beam path through the LCD. I'd say there would be two main obstacles,
    one is the scan speed needed to raster the image, and second is, again due
    to how the LCD blocks color by absoption, there is a good chance you might
    actually melt holes in the LCD matrix even at relatively low power levels.

    That being said, a good candidate could be one of those old overhead
    projector LCD screens from the '80s and early '90s since the screens were
    actually designed to be actively cooled. Plus their low cost ($25-50) on the
    surplus market means if there are problems it won't be too much of a loss.

    Calibration of the lasers side by side would be painful, though that process is
    something that videophiles consider mundane.

  9. #9
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    I bought an Lightwave Electronics (now JDS) Model 142 laser at a Honeywell auction on e bay. When I got the laaer it had paperwork labeled "Laser TV project" Allied Signal Inc. so this has been done at least in R+D labs for sure. My living room...nope...darn it.
    Phil Bergeron( AKA 142laser)

  10. #10
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    I believe Jenoptics in Germany produced a 10 watt white light solid state laser about 5 years ago to power their raster scan laser TV. Development cost was about 1 million Euros. I think it was a TI Saphire laser with laser doubling and tripling in an OPO configuration.

    Another company, NEOS had done some pioneering work quite sometime ago using Acousto Optic Beam Deflectors pairs, a high speed AOM and only single color with resolution of 250 x 250 costing $16K US

    Rick
    Profile Redacted by Admin @ 04.24.2010

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