Does e-paper fit your description? (nice because it only takes power to change, not display) There are LED light arrays. I don't think this is what you want, b

Does e-paper fit your description? (nice because it only takes power to change, not display) There are LED light arrays. I don't think this is what you want, but it came to mind: https://en.wikipedia.org/wiki/Refreshable_braille_display https://en.wikipedia.org/wiki/Refreshable_braille_display