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Discussion in 'Electronic Design' started by [email protected], Aug 6, 2011.

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  1. Guest

    I'm trying to do some research on getting a laser (pointer like thingy) to
    show up on an LCD and/or Plasma screen. Any ideas for a place to go to get
    the low-down on the problem? I'd rather stick with red (650nm) for power
    reasons but it looks like green (532nm) is a bit better, here. A good source
    for laser modules would also be appreciated.
  2. Naomi Price

    Naomi Price Guest

    The surface quality and 'light transprency' of the screen face medium
    itself means that you will likely never get where you want to be

    The only way I can think of is to have a layer behind the screen
    capture the pointer position and then feedback through software to
    artificially light a specific pixel set a specific color, so it would
    appear that the light itself lit the screen face.

    Similar to the light rifle thing in video games. They used to detect
    the light spot position within the CRT itself, and feed that to the
    software, which was decidedly easier than this "layer behind the screen"

    You're welcome... no charge.
  3. Naomi Price

    Naomi Price Guest

    It took them this long to give us high res LCD displays, and they are
    now moving toward great, transparent touch sensitivity, but sending
    'over-illuminated pixel' feedback back to the system is asking a lot of
    them. (not really)

    'Over-illuminated backlight LED pixels', however, could be vectored on.
    Since they use LEDs to backlight now, they could use a properly sized
    array of those to gather feedback from a light device shooting into the
    screen from afar. That is the perfect place for it too. A separate
    backlight engine and feedback system would remain separate from the
    current graphic system, so no gamers would cry.

    It would work great, actually.
  4. Naomi Price

    Naomi Price Guest

    Another way is to develop a PS3 presentation application for their
    pointer system. Likely already out there somewhere.

    I'll see if the std photo album app works any differently with the
    pointing, position sense device in hand and 'lit up'.
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