Some hints, use with caution. One site suggested a belt sander, but I think it was a joke. http://www.wikihow.com/Fix-a-Scratch-on-an-LCD-Screen
Good info there attar, never thought about using Vaseline to fill in a scratch on an LCD, i'll keep that one in mind..
i doubt there is anything that you can do about it other than clearing the glass with cotton and forget it...
Novus makes a 3 step system to take scratches out of plastic screens. How do I know about this stuff you ask? I learned you shouldn't fly R/C helicopters too close to your big screen tv. Your local plastic store should have it.