Insofar as it possible to determine from your photo, you appear to illustrate a characteristic of LCD screen side-backlighting - where you may see slightly brighter patches at the extreme edges of the iPad screen.
This characteristic is usually only visible in a darkened room, with a black screen and high screen brightness. Unless the brightened patches are visible in normal lighting conditions, this characteristic is not necessarily an indication of a fault.
If you are concerned, you would be best advised to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the qualified technicians will be able to test and assess your iPad:
Genius Bar Reservation and Apple Support Options - Apple