Samsung UN55D6000SFXZA - Manual (Page 58)

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– Zoom : Magnifies the 16:9 wide pictures vertically to fit the screen size.
N Adjusts the Position or Zoom by using u , d button.
– 4:3 : The default setting for a movie or normal broadcasting.
N Do not watch in 4:3 format for a long time. Traces of borders
displayed on the left, right and centre of the screen may cause image
retention(screen burn) which are not covered by the warranty.