I'm a Minnesota native as well and I found this forum while searching to find out if my screen fade issue was a defect or a normal thing.
I only see the problem in the unfiltered light of the sun, but it is pronounced. If I expose the screen orthogonally to the sun, it takes only several seconds for the next page turn to be ruined to the point that it cannot be read.
If the sun is lower in the sky or the angle of the reader is not so unfavorable, then the fading will make it no more than extremely difficult to read the text.
As mentioned by others, if I obscure part of the screen with a hand, then the shadowed portion of the screen will not suffer from the problem.
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