Samsung PN51E490B4FXZA - Manual (Page 24)

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4:3 : Sets the picture to 4:3 mode. For analog TV programs.
N Do not set your TV to 4:3 format for a long time. The borders displayed
on the left and right, or top and bottom of the screen may cause image
retention (screen burn) which is not covered by the warranty.
Screen Fit : When your TV inputs HDMI (720p / 1080i / 1080p) or Component
(1080i / 1080p) signals, displays the full image without any cut-off.