I didn't mean to be difficult, but really did wonder under what lighting conditions it appeared. The only photo I've seen of the phenomenon was photographed at a very unusual angle for reading and apparently with an LED Kandle reading light being used to illuminate a reader with internal lighting... If it only appears on the top half of a screen as some have said, one might imagine it was some sort of film or accidental chemical or cleaning spray that might have been transferred during assembly of the display.
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