PSP 1000 Screen Issue

Hi everybody! Finally i decided to sign up on reddit and deciced to make a post. Recently i've bought a used PSP-1000 for 30 EUR on ebay. I've asked seller to send me some pics of the console and i've noticed there are some small black/darker lines at the edge of the screen. The outline of screen on right and left side looks bit irregular, I've tried to google the issue but i couldn't find anything about it. I'll post a pic to get some feedback. Thanks in advance for your help :))

Right and left side of the screen look irregular