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The issue is that unlike an LCD, the display in the Kindle, Sony Reader, Irex, etc, is opaque. Lighting from the back at best will do nothing for you, and at worst will shine through gaps in the coating and wash things out since non of those photons will interact with the particles in the display.
So, an E Ink display needs to be front lit, not back lit. So, aside from the power concerns which you address, there are challenges in getting uniform lighting from a source integrated with the display.
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