Samsung UN46ES7500F E-Manual page 476

side of the screen when displaying up scaled
SD (4:3) contents.
Black bars will appear on the top and bottom
of the screen when you watch movies that
have aspect ratios different from your TV.
Adjust the picture size options on your
external device or the TV to full screen.
A Mode Not Supported message appears.
Check the supported resolution of the TV,
and adjust the external device's output
resolution accordingly. Refer to the
resolution settings on User manual.