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Discussion in 'Plasma TVs' started by yasa22, Jan 30, 2003.

  1. yasa22

    yasa22
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    Ok guys, I am going to ask some silly questions....

    1. What exactly is progress scan and how does it improve / degrade the picture quality.

    2. What does it mean when they say, High definition ALIS Plasma screen ?

    Any information on the above would be appreciated.

    Thanks
     
  2. vonhosen

    vonhosen
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    A Regular TV is interlaced .
    PAL is 25 frames (or full images) a second & has a refresh rate of 50Hz.
    These 25 full images have a vertical resolution of 625 lines (of which 576 will be visible) The lines are numbered 1,2,3, etc.
    Every 1/50th of a second the first field (the odd numbered lines) are displayed & then the next 1/50th of a second the even lines are displayed . So in fact although the alternate lines are displayed every 1/50th of a second the whole frame is displayed every 1/25th of a second. ( & hence 25 frames a second for PAL)

    A progressive device doesn't have these full frames split into two & then displayed every 1/50th of a second it just displays the full frame every 1/25th of a second

    NTSC has 480 visible vertical lines & has a frame rate of 29.97fps


    ALIS is a technology used by Hitachi and stands for Alternate Lighting of Surfaces. They claim this gives outstanding image quality & resolution & improves longevity of the screen.
     
  3. StooMonster

    StooMonster
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    Is ALIS interlacing for plasmas?

    Bit like Phased Alternate Line, but at higher resolution? e.g. Half the lines are displayed for one frame, and the other half for another frame.

    Isn't this also behind the claim of double the life-span?

    Only joking of course :laugh:, haven't actually seen ALIS in action. :devil:

    StooMonster
     

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