Do you have an app called Peel Remote installed?
I've seen this happen a few times - https://androidforums.com/threads/new-charging-screen.1133738/
Ah, ok. There are instructions for de-registering it here then - https://selfsolve.apple.com/deregister-imessage
I'm pretty sure ES File Explorer has a similar feature. Do you have that installed?
It sounds like screen burn in and to fix that, you probably need to replace the screen. :(