Chosen Solution
Just finished a battery replacement and now my screen has a weird thumb-sized polarization effect. Touch still works in the affected area. It is definitely the screen, it‘s not present in a screen cap and is a trip in real life. Actually it’s pretty annoying, but still usable.
Looks a lot like the diffuser layers are messed up. Did you use anything such as alcohol to remove the display? Sadly there isn’t any practical way to fix this except with a new screen.
