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Originally Posted by sourcejedi
4) On my display, direct sunlight can cause the image to actually fade and/or show even more ghosting, over a period of several seconds, to the point of near unreadability. This is the manufacturing defect, which caused Sony and other reputable producers to accept returns. It's said that they basically forgot to turn on the manufacturing stage which added a UV-protective layer. I don't think it's about the display getting too warm, because it fixes itself very quickly if I move into the shade. It's just vulnerable to a certain type of em-radiation. Note that E-Ink adjusted their testing, so in theory more recent batches like the Pearl displays should be free of this specific defect.
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It was a faulty batch of screens manufactured by LG which exhibit this behaviour. They ended up in lots of different brands of reader.