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Advice on how to dowse a 55" flat panel tv

Discussion in 'Multimedia, Projection, and Show Control' started by RJNAP, Sep 11, 2018.

  1. RJNAP

    RJNAP Member

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    I'm adding 2 55" flat panel TV's in profile orientation to my set design and the LD wants the Dowsed some way to avoid "vomiting Light " when they go digital black.

    if this was a Projector , I'd use a string and a piece of cardboard .

    I am playing around with the idea of rotating it into some kind of pocket or black bag but can't quite visualise it .

    open to any ideas,

    thanks !
     
  2. sk8rsdad

    sk8rsdad Well-Known Member Premium Member Fight Leukemia

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    It would help to have a sketch. There are too many unknowns.

    Suggestions include flying in a drape, using a roller blind, sliding panel, pulling a curtain, putting a bookcase in front of it or having 4 or 5 stagehands stand in front of it.
     
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  3. rwhealey

    rwhealey Active Member

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    Do you have the budget to go with a LG OLED display? It shouldn't make any light when it is all black.
     
  4. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    Might want to just see what happens if you dig into the menus and turn the backlights down. Depending on how you're lighting the show you may not need the brightness jacked up on the TV's in the first place.
     
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  5. ruinexplorer

    ruinexplorer Minion CB Mods Premium Member Fight Leukemia

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    The amount of video black will depend on the technology used to illuminate the screen. If you get an OLED screen, you will have the truest black.
     
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  6. FMEng

    FMEng Well-Known Member Fight Leukemia

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    Some Samsung LED LCD models turn off the light source when the image goes to black.
     
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  7. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Walk slowly while holding the TV parallel to the ground about waist high. When it senses subterranean water, it will bend toward the source. Drill, baby, drill.
     
  8. danhr

    danhr Active Member

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    We bought an inexpensive (<$50) color bar/ black burst generator and use it through a switcher as needed. Not sure what format you're using, this setup is NSTC.
     
  9. Jay Ashworth

    Jay Ashworth Well-Known Member

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    Indeed, OLED displays will not generate *any light at all* if you feed them a true black (though you have to be careful about "setup", which sometimes leaks into HDTV signals where it doesn't belong).

    If you haven't *bought* the screens yet, check the price-up on OLED.

    Do *not* be misled by "QLED" or any number of other "we wanna be OLEDs but we're not" technologies.
     
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  10. Ben Stiegler

    Ben Stiegler Active Member

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    And I was gonna mention non dim circuit / relay to kill the power...
     
  11. Jay Ashworth

    Jay Ashworth Well-Known Member

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    Yabut...

    To me, at least, a Dowse and an Undowse, are things that take less than a second, preferably, about 100ms.

    Flat panel TVs tend to take several seconds, at least, to power on, and how they come up is pretty indeterminate.

    If all the OP needs is "Starts on, and dowses after use", yeah...
     
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  12. StradivariusBone

    StradivariusBone Well-Known Member Fight Leukemia

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    So that explains this...

    [​IMG]
     
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