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How do I keep my LCD monitor 'alive'

Discussion in 'Electronic Design' started by Pussels, Mar 20, 2005.

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  1. Pussels

    Pussels Guest

    I just bought an expensive 10.4" daylight readable LCD monitor for a
    project.

    The problem is that the monitor is designed to blank to no image (black) if
    no video signal is present.

    My video source can be a little noisy, ie dropped frame every now and again
    because the video camera is on a small mobile vehicle tramsmitting video
    over a video sender and occasionaly you get a droped frame or two.

    If I connect the video input to a another monitor without this blanking
    circuit, the video is much more constant, but with some of the frames seen
    with noise etc (which cause the other monitor to blank to no picture for
    about a second).

    Can anybody suggest a way to 'fool' the monitor into thinking that is always
    has a 'solid' video signal, but display the signal with dropped frames
    and/or noise.

    Any help would be very greatly appreciated. The manufacturer said this
    blanking circuit cannot be disabled.

    Brian
     
  2. I read in sci.electronics.design that Pussels <>
    If the blanking detects absence of sync pulses, you might win with a
    sync regenerator, but it could be a brute-force solution.
     
  3. This is a bit of a kludge, but look at the Intersil sync separators
    EL1883 /EL4583etc(there are quite a few to choose from).
    http://www.intersil.com/cgi-bin2/Ms..._ON=Y&ALLCATS=X&EN=X&NO_DL=X&QUERY=video sync

    You use the sync generator which is locked to the incoming video feed
    to supply syncs to the monitor when the incoming video is bad. You
    detect the bad video by looking at the RSSI signal strength pin on the
    Rx and use a video switch, (Maxim etc) to toggle between the real
    video and th locally generated.

    You will probably need to provide hystersys so that when the RSSI "is
    on the edge" it doesnt keep flipping too often

    I dont think this is a one chip solution. It might be quicker to get a
    different LCD


    martin


    Opinions are like assholes -- everyone has one
     
  4. or if you are recording onto a DVcam, look through the monitor out,
    this will **possibly** have the syncs regenerated

    sorry for the sloppy thinking, should have thought of this before



    martin


    Opinions are like assholes -- everyone has one
     
  5. Pussels

    Pussels Guest

    thanks fellas, I will give those ideas a try.

    Brian
     
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