I have bought a few wide-screen edition dvds. However my TV is 4:3. Thus the film is rather "small" on the tv. I realised that my dvd player has a "pan and Scan" option which according to the manual allows the picture to "blow up" proportionately to fit my screen. This option does not seem to work on my dvd. The picture remains small on my tv. Have i forgotten to set something or does this option only work on specific dvds?