Incidentally, they function by stimulating nerve endings -- either through electrical pulses (electrotactile) or vibrations (vibrotactile). Much like the Sense

Incidentally, they function by stimulating nerve endings -- either through electrical pulses (electrotactile) or vibrations (vibrotactile). Much like the Senseg device I spoke of, the linked device is probably a variant of vibrotactile where the vibrations are generated by electrostatic forces (think "capacitor forces") via transparent electrodes on the front of the display.