HD Plasma: why 1280x768

Discussion in 'Archived Threads 2001-2004' started by Ken Chan, Feb 18, 2003.

  1. Ken Chan

    Ken Chan Producer

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    I was looking at a Pioneer plasma at the store (I forget which one, it was $11000), and noticed that the resolution was listed at 1280x768.

    The current progressive HD resolution is 1280x720, which is 16:9 with square pixels. If the plasma does 768 instead of 720, does that it mean it does just a wee bit of vertical interpolation? And if so, is there actually some sort of benefit? Seems that would make the picture slightly worse.

    //Ken
     
  2. DaViD Boulet

    DaViD Boulet Lead Actor

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    Ken,

    I've wondered the same exact thing. I think the extra pixels are just blanked-out for masking (in other words, it doubt that it woudl rescale a native 1280 x 720 picture to fill the 768 vertical pixels).

    But you're right...one has to ask "why 768" when 720 fits the 16x9 HDTV signal just fine???

    dave
     
  3. Ken Chan

    Ken Chan Producer

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    Well, that's two of us, but it looks like it remains a mystery.

    768 is more in line with computer resolutions, although 1280x768 is an odd aspect ratio.

    Are these plasma screens exactly 16:9? Are they using square pixels? Both of these can be determined with a test image and a ruler.

    It makes the most sense for the screen to be slightly taller and those extra pixels to be unused when viewing HD, but that would commit the cardinal sin of "unused screen" and I'm pretty sure that the screen is indeed filled. There's nothing lost to overscan for plasma HD, is there?

    //Ken
     
  4. ManW_TheUncool

    ManW_TheUncool Producer

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    I've read somewhere that plasmas do often use non-square pixels depending on the design/manufacturing process, so the full 1280x768 is likely used for the 16x9 image. Of course, this doesn't really mean that's the case here.

    FWIW, there are also square pixel plasmas that do 1366x768 and a whole lot of other non-square pixel resolutions. 768 vertical does seem like a popular # though, eg. 1024x768 for 16x9.

    Anyway, you'll probably get a much better answer over at AVSforum since they have a section dedicated to plasmas (plus LCD).

    _Man_
     

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