What Jon said is pretty much right. The issue that backlit e-readers have outdoors isn't glare, it's that they aren't as bright as the sun and so are overwhelmed by the ambient light. E-ink readers, on the other hand, are fantastic in the sun. But they can't be backlit because they are actually opaque (pretty much the same reason paper can't be backlit).
Of course, an e-ink reader that syncs with the reader on your phone would solve the problem nicely.
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