I think that before I invest myself too heavily in any particular hardware, I should try to find out more about what sorts of software exist for such passive wall displays. For example, I wouldn't mind something like the custom channel used at my local coffee shop, with my own pick of RSS feeds, weather sources, GCalender items, and the like; but I don't know offhand any piece of software, either for Android or Linux, that does that.
I wouldn't computer in bed, used to, but it generally leads to bad habits around distraction and sleep
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