I've not seen anything like that @Camilachaves
It could be screen burn I suppose.
A Samsung Experience Store or Samsung Service Centre can take a look for you.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.
there are some quite big threads about that issue on XDA. I have the same problem. It is not a burn in - it's a faulty hardware. Some have cheese graters, others a solid recentagle on theirs screens.
Weirdly enough in my case this occured a one day after i've pealed off the screen protector, that i've been using.
Some say it's a glue, others that this is a cooling elemnts sticking to your panel, or even faulty battery. For some folks problem went away by it's own with time.
I will be contacting Brand Store in the near future. It was a 1k usd phone...
Sir u are not alone I have the same problem with my Samsung note 9 I don't think it's a Burn in it's also more noticeable on YouTube on Dark mode
Mine is to do with the battery
When I turned my phone off and wirelessly charged my note 9 it would not bring the charging logo but a red flash of a cheese grater on my phone. Well theres the colprit on mine. A faulty wirless charger and battery. The production date is 2018 or September. 512gb
I have the same white rectangle issue. My freiend too. We all have this glitch after android 10 . Revert to android 9 help to my friend. But I`m on latest update and can`t return to android 10 since I`m on latest security patch
Only thing you can do is replace the screen or phone. I have been trying to find out what it was caused from. It is caused from the heat but I have one that was caused from wirless charging my phone and had a surge and created that .
I have the same rectangle in my note9 screen.
Unfortunately my phone has just passed the warranty period a month a go so after contacting Samsung it would not be covered.
I think that this is a manufacturing defect since that a lot of people have it, and they should replace it for free.
It is not our fault to buy a defected device!!