Reducing the Screen Door Effect

Discussion in 'Displays' started by Lew, Jul 21, 2004.

  1. Lew

    Lew Auditioning

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    Has anyone had any luck with reducing the screen door effect. I have a Sanyo PLV-70 LCD projector using component video input (hopefully to upgrade to DVI soon) displayed on a 108" diag. Dalite screen connected to HD DirecTV.

    I notice it mostly when watching CBS-HD. When I watch HDNet channel, I don't see any at all. So, I think it may be a function of the resolution of the transmitted signal, rather than the LCD projector.

    Does anyone have any insights about this phenomena?

    Thanks.

    Lew W.
     
  2. ChrisWiggles

    ChrisWiggles Producer

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    Screen door is the resolution limit of the projector. Being an LCD projector it is worse. You can either defocus slightly, sit farther away, or buy a better projector...
     
  3. Lew

    Lew Auditioning

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    This is a very high resolution projector. How do you account for the "non-screen door" on the one channel versus the other channel, which are both at 1080i?

    Lew W.
     
  4. ChrisWiggles

    ChrisWiggles Producer

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    Screen door is solely a function of the pixel grid of the projector. That projector is a relatively high-resolution one, but still it is an LCD projector, which means the SDE visibility is greater than that of 720 DLP projectors, and I would still sit 2x or more from such a dlp, and even more from an LCD at this resolution if I wanted to eliminate SD, coupled with a little bit of defocusing.

    If you are only seeing what you call screen-door on certain material, then it is something else you are seeing.
     
  5. Lew

    Lew Auditioning

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    Maybe it is something else, and I will try defocusing a little and see how that works.

    DLP is out of the question, because I don't have a completely dark room to view it in.

    Lew W.
     
  6. Neil Joseph

    Neil Joseph Lead Actor

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    Real Name:
    Neil Joseph
    Moved to displays.
     
  7. Chris Moe

    Chris Moe Screenwriter

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    I think you are confusing DLP with CRT. You don't need any better light control for a DLP than you do with an LCD (assuming similar lumens).
     
  8. DaveGTP

    DaveGTP Cinematographer

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    A very tiny bit of defocusing should help with the SDE. I saw a lot of it at my sitting distance with my X1. Then I defocused just a bit. Now I only see it on the occasional white or very bright scene. I think the nickname for that is peekaboo screen door effect.
     

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