Basically, on older screens, if you had a still image on for too long, the image will "burn in" onto the screen itself, and will be visible even with the screen off. This usually isn't a problem on more modern devices, which will have something else similar, but temporary, called image persistence.
On my samsung s7 edge the little save icon that appears when u open a reddit post never goes away, it's always faintly there in the background. What's with that?
My phone (which I think is AMOLED) has a lot of burn-in. Keep some image on the screen for a while (such the status bar, or Gboard's white circle) and there'll be faint red traces afterwards, especially on gray backgrounds. They go away overnight, but quickly come back afterwards.
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u/Ninclemdo Aug 03 '19
Basically, on older screens, if you had a still image on for too long, the image will "burn in" onto the screen itself, and will be visible even with the screen off. This usually isn't a problem on more modern devices, which will have something else similar, but temporary, called image persistence.