Re: When is the last time anyone has read a braille book?
That's more or less how the piezoelectric, pneumatic, and EAP/artificial muscle stuff works. (And also how LCDs work.)
I kept reading things that said that arranging so many small parts into a cramped space is part of the difficulty, but... they've been doing that since the 1930s, at least, with CRT televisions, haven't they?
The descriptions make it sound like fitting the circuitry in it would be difficult, but again, LCDs can be pretty thin without trouble.
So... yeah, aside from some minor details, it sounds like what you described really should work, and I'm not entirely sure why it doesn't.
[edit]
If this wasn't dated 2009, and didn't mention that it was picked up by the National Braille Press, and if other papers I found didn't suggest that it turned into the B2G, I'd say this tried to sound like exactly that:
http://www.jpl.nasa.gov/news/n
ews.php?feature=2278
[/edit]
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