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I have to disagree I think you can put a light behind, well, normal paper and it could improve the contrast and readability in dark, although it is not completely transparent.
Try with a sheet of paper and a mobile phone.
Similarly I am sure you could put a backlight behind the screen of the iliad as well - I don't think that it would not have any effect - the E ink layer is not so thick.
Of course this is not an ELEGANT way of doing it.
On the other hand people say that many LCDs are now visible in the sunlight and have less electricity consumption so why bother with eink? Well could be but I have not seen any yet, specifically ereaders.
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