Mine developed ( no reason I know of) what I would call a "blotch" of purple. As best as I can figure, it's visible unless the phone is actually painting the area of the screen with a color- but if its a light color the purple bleeds through.
If I take a screen picture, areas of the screen that should be black show the blotch, light colored objects show bleed through.
The same with any photos taken-- if they are framed in the view finder to be where the screen blotch is, light colored objects may show bleed through, black objects will have a purple blotch. This will show if the saved picture is printed, or if it's displayed on any computer screen.
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second observation, indoor pictures seem to have a yellow cast - I do have rooms where the light is fluorescent- but changing the camera settings to fluorescent doesn't seem to have any effect.