They name the DVD "wide screen" after the projected image not the type display you have. Wide screen films are more like 2.35:1 aspect ratio rather than the 1.78:1 aspect ration of your 16:9 widescreen TV. Ultra Panavision films like
Mutiny on The Bounty are filmed in a 2.76:1 aspect ratio. Many films (not widescreen) these days are filmed in 1.85:1 which will fit a 1.78:1 screen without bars with minimum cropping or stretching.
Edit: I have added a new essay on my blog on this subject with illustrations. Click here for:
DVD Pictures