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The Images on the TV screen depend on the type of software and the TV set.
How images appear on your TV (aspect ratios of the screen)
The images which appear on the TV screen, and what each screen mode is called, depend on the manufacturer of the TV set and type
of TV set. Consult the instruction manual provided with your TV set.
For your reference:
Letterbox
Black bands are inserted at the top and bottom of the screen to fill in the gaps where the size of the picture is smaller than the screen.
Pan and scan
Part of the wide-screen picture (either at both sides or one side of the screen) is automatically eliminated so that the picture fills the
whole screen.