Display problem

[Tanvir25800]

Device Samsung m31 What is the reason for my phone display to burn like this? why?

[ahmeddissoosa]

Some physical damage

[Tanvir25800]

But why

[Anikroyale]

This is known as display bleeding and occurs mostly because of physical damage or liquid damage.

[Tanvir25800]

Now how to fix it

[Anikroyale]

Get the display replaced.

[Sidhabhi]

Better visit service center and get it checked once

[Tanvir25800]

Yes but it’s haven’t warranty

[d5505]

Looks like carbon paper

[NOMAĐ]

You have to turn in to service center and get the screen replaced. Happened on my mom's M30 as well.
Screen replacement will cost around 3k for this model I think.
Try your luck