It sounds like you have geometry problems which only show up clearly when you watch something in 16:9 ratio.
It's probably a good idea to get an engineer to have a look at the TV. If however, the bend is less than 5mm, then he will probably say it is "within tolerance" and won't do anything!
If you are feeling confident, a visit to the service menu should improve things somewhat. Do a search on the forum for "Philips Service Menu". Remember to write down all the original settings first!
Good luck