Sony WEGA KDE-50XS955, KDE-37XS955, KDE-42XS955 Operating Instructions Manual page 70

Changing the Wide Screen Mode for 16:9 Source (High definition source)
original source
Upconverted 4:3
Example
WIDE
Wide Zoom
Normal
(This mode is not available.)
WIDE
WIDE
Zoom
68
Native 16:9
Description
Wide Zoom
enlarges the center portion of the picture. The left and right edges
of the picture are stretched to fill the 16:9 screen.
m
m
Full
displays the picture at its original size.
Full
m
Zoom
enlarges the picture proportionately, both vertically and horizontally.
When the TV receives a 720p or 1080i signal, Normal cannot be
selected.
When TV receives a 720p or 1080i signal that is 4:3 aspect ratio
picture (upconverted to 16:9) with a black bar at each side, Full
returns the picture to its original size.