I also wondered about a the feasibility of embossing braille on a shape-memory polymer. Imagine a machine that is long and skinny, like a single line of text. It had a roll of paper wrapped around it on an endless loop, and you can scroll this paper back and forth with your finger. On the right side in a braille embosser, so as you scroll with your finger new characters get embossed into the paper, and as it passes underneath the device electrical current is sent to the memory paper with un-embosses the old braille.

Never mind I get it. Well no, because I still don't see how your mention of the vibration feature relates to anything, but basically what you're TRYING to say (somehow) is that because phones have vibration functions then it is feasible for them to have a tactile screen. I don't get the logic in that

There is at least one existing product for pressable buttons on touch screen keyboard keys: http://tactustechnology.com/technology/, http://www.getphorm.com/. I don't know how well it would handle braille in its current state- it probably has "button" size and number limitations since it uses a fluid to raise parts of the screen.