[digdugdirk]

Aha! You might be just the person to ask about something that's I've always been curious about - are there any other types of Braille mechanisms other than the "pin on a lever arm" concept? They seem so fragile and clunky, and I'm surprised there hasn't been anything revolutionary that's sprung out of the miniaturization over the past 3 decades or so.

[RobMurray]

There are some, in particular the orbit reader[0] is much cheaper than a piezoelectric display. The trade off is that is is relatively slow to refresh and quite noisy.

There is also the dot pad[1] which is much more like a screen with a rectangle of cells that can show Braille and graphics! It is a different technology using electromagnetic actuators with latching. It can only refresh when not being touched. It's also out of the price range of most consumers, but apparently the technology scales very well so they expect the price to fall. It is also modular so users can easily replace broken cells.

The Monarch[2] is based on Dot Pad technology and also runs Android and Humanware's Keysoft software like the BrailleNotes.

[0] https://www.dotincorp.com/en/product/dotpadx

[1] https://www.dotincorp.com/en/product/dotpadx

[2] https://www.aph.org/product/monarch/

[sujalbhakare]

I agree with Rob here, Piezoelectric displays are expensive to build, need quiet a bit of tuning and are almost always non-repairable.

When I was working on the Tactis and researching about all the mechanism' that exists, I came across Electromegnitism based mechanisms' very rarely, It is an underexplored way of building braille displays, mainly because of the actuation problem when being pressed against, we are trying to come up with a solution in our V2. Hopefully we get there.