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Originally Posted by astra_lestat
I don't know how eInk technology works so I can only guess. I think backlight might be incompatible with eInk screens. Text search and touch screen might be incompatible with today's eInk screens as well. Maybe it cannot show the required info as fast as these features are requiring for normal operation. It also might drain batteries too much and at the moment I think battery life is the second most prominent feature after eLink screen.
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You can't backlight an eInk screen (because it's not transparent, so the light wouldn't show through!) but you could certainly "side light" it. There are eInk devices with touch screens, so that's certainly feasible.