Blue area on display

[Baumchen]

I got a blue area(~0.5 cm) on the display on brighter backgrounds(google playstore, chrome empty page,..) which is kind of annoying. But not on darker backgrounds.
Since I got the phone just out of the repair(they sent me a new one) it feels just depressing if I directly request another repair.
Is there any possiblity to calibrate it on my own or somehow fix it?

kind regards

[Phy · Accepted solution]

that could be a hardware issue, just sent it back, contact Sony Xperia Support.
http://support.sonymobile.com/global-en/contactUs/