I am curious on the real cause of this. Is it only sunlight or any bright light? The difference is that sunlight also brings along heat and UV. I wonder what would happen if you cover half the screen and expose the other half to a bright florescent light (less heat). Or expose the uncovered half to the sun from the inside side of a window on a cool day.
If it's UV, there are UV light bulbs to test this out. I've heard that the Que has an UV protective coating on its screen. Perhaps that's the difference? I've also heard that regular plastic can block out most of the UV, so touch-enabled sony devices may be more protected.
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