Quote:
Originally Posted by garywitscher
I'm not 100% certain, but it seems to me that it's not so much the direct sunlight as it is the temperature of the unit. Often I'll keep my DR800 in my car, and then at some point stop at a park for some reading. During hot days it can get very warm from being in the car. When I take it out to read the text is almost to light to see. As soon as the screen cools down a bit the text darkens to normal. If the sun is shining right on the screen it will heat up again and the text will lighten, all I have to do is point it away from the sun and the text darkens. It seems to me that I can feel the over heated screen if I put my hand on it.
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That's one of the speculations. EInk says the operating temperature of their displays is 0C - 50C (aka 122F). It's possible in direct sunlight that a localized portion of the screen gets above 50C.