Braille books are mighty thick, so while I remain skeptical of standard e-book readers’ utility, a braille version would make it much easier for the blind to carry books with them.
This particular concept was designed by Seon-Keun Park, Byung-Min Woo, Sun-Hye Woo & Jin-Sun Park, and it uses an electroactive polymer to raise the braille dots when a charge is passed through certain areas of the screen.
And for those familiar with braille, it’s probably easier than listening to Kindle’s disputed text-to-speech robot.