iPhone 12 pro display turned half blur and got back right after I restarted it . Can I know whats the reason for it?

same but i took out my case and cleaned my phone and since my case is very hard to put back, half the screen was blurry but then went back to normal

Exactly the same thing happened with me , I also did the same thing and it came back okie, but there is something wrong

Just now my iphone 12 display turned blur with blue font. Restarted and is working fine. Hope nothing major!