DLP dimples?

Discussion in 'Displays' started by craig_curtis, Feb 10, 2004.

  1. craig_curtis

    craig_curtis Stunt Coordinator

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    I recently read an article in the circuits section where they mentioned a problem with DLP projectors. They were calling them "dimples" and even quoted Texas Instruments as coming out with a new DLP chip that is dimple free.

    What exactly are the dimples? I assume is like a dark spot on the screen?
     
  2. Gabriel_Lam

    Gabriel_Lam Screenwriter

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    A dimple is a spot in the middle of each DLP mirror. It causes a small dark dot in the middle of each pixel. The HD2+ has no dimple.
     
  3. craig_curtis

    craig_curtis Stunt Coordinator

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    is it that noticeable?
     
  4. Allan Jayne

    Allan Jayne Cinematographer

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    If each pixel has a dark spot resulting from a dimple in its respective mirror, is there an overall haze over the screen caused by light reflecting off the dimples and going in various random directions? This would be comparable to unnatural ghosting on dark parts of the scene as viewed on an RPTV due to light reflections inside the cabinet.

    Video hints:
    http://members.aol.com/ajaynejr/video.htm
     
  5. ChrisWiggles

    ChrisWiggles Producer

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    I just found this with a brief google search, there are better illustrations out there but here:

    http://www.chip-china.com/images/2003/0918/dlp.JPG

    The picture of the mirror shows the dimple, that black hole in the middle of the mirror. This was necessary in manufacturing i think to secure the mirror or make the pivot thing. Anyway, the HD2+ chips don't have dimples anymroe.
     
  6. ChrisWiggles

    ChrisWiggles Producer

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    HD2+ projectors are out now, around $10K. You may find the shootouts between the Shark 12000 HD2+ projector and both a Nec XG and Sony G70 CRT over at AVS interesting.

    The HD2+ dlps are the first projectors, IMO, which are a fair comparison against a CRT. Previous models just weren't close.
     
  7. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    hi guys

    I recently installed a Marantz vp-12S3 in my own theater. I am loving it!! [​IMG]
     

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