Are you by chance reading where it's very hot? If you force a screen refresh, do the lines go away?
It sounds like what I see when I read outdoors in the hot sun, but the lines on my Glo form from the bottom up. I haven't had the Glo HD out in the hot sun as usual this summer to know if it forms the same lines.
Edit: Actually the 2nd picture showing the white lines on a black background might be something different than what I'm thinking of.
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