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As strange as it sounds, but sun rays also affect the e-screen!
Sun rays will make a raster appear (your screen to appear grey-ish). White becomes washed out, black becomes more grey, until finally the whole screen is rasterized.
How that happens? I don't know!
I only challenge you to try it!
Load a photo on your ereader, cover one half of the screen with cardboard or something dark, and place it in the sunlight.
The covered part will remain high contrast, while the revealed part of the screen will be washed out until the screen is refreshed.
Perhaps UV light... Someone got to do some testing on it!
I know one thing, it's definitely not magnetic interference, as I've tried many magnets on the screen, and they where incapable of changing anything on the screen.
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