Hi guys, I just bought an Xperia Z5 over the internet. I used it very little since I did not have enought protection for it.
Once I got the glass cover for the screen and a nice bumper I booted it up. And... doh! The screen looks weird... an area of the screen is whiter or more brilliant than the others... (see image below).

The guys who sold it to me tell me that LCD dislpays can have variable tones of white related to pixel temperature. My question: Is this considered normal? Does the technology work that way... will that white "shadow" or "halo" eventually disappear?
Thanks!