My brother's girlfriend is a patent clerk, and I know she tries to research stuff first (isn't uncommon for her to call up my brother, when it is stuff of a medical nature, for advice), but there is just so much stuff they have to do, that many don't have the time to really research it.
And as far as differing types of displays justifying the patent, well, I dunno if that would be enough. Not to mention, I think I've seen something similar before (not mixing eInk and LCD, but other display techs, such as CRT and LCD). I really see no reason why this wouldn't be knocked out as invalid.
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