The only time I've noticed my screen lightening was when I was reading in line on Black Friday (I live in Iowa, so this was near freezing) I had to stop reading the manga I was reading, it was simply too light. A normal book was still legible, and when I booted the book back up in the store in line it was back to normal.
(I've noticed the same thing with leaving it by a window as we get to near-zero temps here. The screen doesn't like cold.)
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