Sony WEGA KDE-37XS955 Operating Instructions Manual page 69

Changing the Wide Screen Mode for 16:9 Source (High definition source)
original source
Upconverted 4:3 Native 16:9
..... enlarges the center portion of the picture. The left and right edges
of the picture are stretched to fill the 16:9 screen.
Wide Zoom
Normal
(This mode is not available.)
displays the picture at its original size.
Full
enlarges the picture proportionately, both vertically and horizontally.
Zoom