I've been using my Kindle Paperwhite 1 for four years in conditions ranging from almost freezing in winter to reading in direct sunlight in midsummer, and I've never had a problem with it. The screen still looks exactly as it did when I bought it in november 2012.
So yeah, if there ever was a problem, it's only there with older readers (before 2012).
I don't know what would happen if you put an e reader in bright sunlight for 8 hours straight without moving it and not changing a page during that time. I never did it. I wouldn't recommend it.
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