[bramd]

Braille tablets/multiline braille displays are finally coming. The traditional piezo-electric cells are not well suited for them, due to the space the cell + driver+ electronics need. Putting the four rows of pins in a cell does already require staggering the elements. If you disassemble a cell, you'll see that every row has another pin length the bottom row usually has the longest and the top row the shortest pins. So this is not very scalable for multiple lines of dots.

There are two commercially produced techniques for multiline braille displays now: the first comes from Dot (a Korean company) who makes the Dotpad, this technique is also used in the Humanware/APH Monarch which will be an Android based standalone braille tablet. The other technique is created by Orbit Braille and they have their Graphity braille tablet. I couldn't find any good technical documentation that describe how these methods work exactly, so if anyone has any pointers I would like to read more about it.