Sony Bravia KDL-40CX520 I-Manual Online page 96

Your TV will show these programs with black bands at the top and
bottom of the screen. For more details, check the documentation that
came with your DVD (or contact your program provider).
Programs in 4:3 aspect ratio will have bands on the left and right
sides of the screen.
Programs broadcasted in HD formats (720p and 1080i) with 4:3
content will commonly have black bands on the left and right sides of
the screen which are added by the broadcaster.
[Auto Wide] will not expand the picture when the black bands on the
sides of the screen are added by the broadcaster. You can manually
set [Wide Mode] to [Wide Zoom] or [Zoom], which will remain in effect
until you change the channel/input or manually change the [Wide
Mode] setting again.
Certain programs on DVD or other digital sources display a
loss of detail, especially during fast-motion or dark scenes.
Less detail than usual or artifacts (small blocks, dots or pixelation)
may appear on the screen, due to the digital compression of the
source content used by certain digital broadcasts and DVDs. The
degree of visible artifacts depends on the clarity and resolution of the
TV.
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