Display problem on iPhone 13 Pro Max
Display white problem on iPhone 13pro max
[Re-titled by Moderator]
Hello Displayproblemoniphone13promax!
This issue has been reported quite a few times on ASC.
So, I would first recommend you try a Forced Restart, and if that is to no avail, then have your iPhone checked out: Genius Bar Reservation and Apple Support Options - Apple.
I hope this is helpful. Good Luck!