Some DVDs that are widescreen (Babylon 5 for example) are displayed as fullscreen. The samsung dvd player has a "ez view" feature, but its widescreen mode also is full screen.
However, I can force it to show as widescreen by choosing the sony tv's 16:9 enhanced mode.
make sure that you have set-up the samsung dvd player to display 16:9 also, the TV determines how a picture is displayed, so you have to set-up your TV to display 16:9 viewing mode. cheers