I am very interested in the PSP screen problem described in this topic. I have a similar issue on my PSP 2000 - quite a wide border around the entire edge of the PSP screen, very accurate and even, with round corners. It flickers slightly when I turn my PSP or simply look at it from a different angle. The only difference that this border is quite wide, about 0,28 of an inch, too wide to think about it as some light distortion.
The border is slightly lighter than the center and it is clearly visible only in a dark grey color (like when you press "Home" button in the game). I have a PSP 2000 about 3 or 4 years now but I noticed it only recently. I don't know if it appeared out of nowhere or I damaged the screen somehow or maybe I just haven't noticed it until now.
Any insight on this matter would be greatly appreciated. I don't know if I should try to repair it or take no notice of it because because it's a matter of course.