I wonder to what extent dot size / spacing matters. Traditional braille is absolutely tiny to make it even remotely possible to construct books, but with a digital device it might make more sense to make it larger.
Making it 3-4x as large would make it fairly trivial to use off-the-shelf servos for each dot. Instead of moving your finger left-to-right across multiple characters, it'd raise & lower the dots while your finger stays on them.
You could even take it to the extreme and create a "reverse steno" display: imagine a regular keyboard home row, with one dot per finger. Use the thumbs for speed control or word skip or something. Maybe it could do double-duty as input method.
Making it 3-4x as large would make it fairly trivial to use off-the-shelf servos for each dot. Instead of moving your finger left-to-right across multiple characters, it'd raise & lower the dots while your finger stays on them.
You could even take it to the extreme and create a "reverse steno" display: imagine a regular keyboard home row, with one dot per finger. Use the thumbs for speed control or word skip or something. Maybe it could do double-duty as input method.