What happened to the LCD screen: burned out pixels or what?

Question

Monitors

I didn’t attach any importance, I thought it was an ordinary blunder, until I tried to wipe it with a rag. It turns out that the upper right corner of the chrome remained on the screen as a white imprint. Now, wherever I go on the screen, there will be a barely burnt out section of chrome with its extensions. How could this even happen?

Answer 1

It looks like the degradation of the LCD filters over time from constant exposure to the light flux.

Answer 2

Could this be an OS bug? Check on another system.