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Overscan - whats that??

Discussion in 'LCD & LED LCD TVs Forum' started by RAD10, Oct 20, 2005.

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  1. RAD10

    RAD10
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    May sound like an idiot but several threads keep mentioning about overscan adjustments. Whats that and how does that work?? Please help!!!!!!!!!!!!
     
  2. LV426

    LV426
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    Overscan is an intended part of any TV system specification. The term originated in Cathode Ray tubes (which "scan" a beam of electrons over the screen to create their image) but is equally applicable to any type of display. It means that the TV screen intentionally displays the incoming signal, such that about 5% of it is off the edges and cannot be seen.

    The important part of any image (if the source is created correctly) should be contained within a "safe area" inside this 5%. At the extreme edges, there may be nothing, there may be unimportant parts of the image, or there may be garbage. A good example of the latter is the head switching noise that occurs on videotapes.

    The overscan area (5%) is not intended to be seen.

    Adjustments can be made to many displays to effectively "shrink" the displayed image so that more of it is visible. This would actually represent incorrect adjustment of the display and may reveal unwanted content (like head switching noise), it may reveal nothing except a bit of black, or it may reveal a little more image, depending on how the source was mastered.
     

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