ProScan 40LC45S User Manual page 15

Basic operation
Normal
The original 4:3 aspect ratio (1.33:1 signal)
is preserved, so black bars are added to the
left and right of the image. Standard TV
broadcasts are displayed with a 4:3 aspect ratio.
Wide
When watching a standard broadcast or full-frame
movie in this mode, the display image is stretched
proportionately to fill the TV screen.
When watching a widescreen (1.78:1 signal)
program or movie, the display image fills the TV
screen.
Zoom
Stretches the 4:3 aspect ratio image vertically
and horizontally to fill the screen at 1:1.78
aspect ratio.
Cinema
Stretches the 4:3 aspect ratio image vertically
and horizontally to fill the screen at 1:2.35
aspect ratio,
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