Microsoft Research has shown off some new technologies for bringing touch sensation (haptics) to glass screens.
Being able to feel a touch responsive screen can make typing more secure, and improve speed and accuracy.
Microsoft Research showed off 3 techniques – one would use piezeo-electrics to actually move the screen down when you press on it, simulating a physical key. This was shown on both a Lumia and a Surface Touch Cover.
Microsoft also showed off another technique, which would use rapid vibration of the screen and a trapped air layer to change the perceived texture of the screen. This was shown off on a Nokia Lumia 920.
Lastly they showed off an electrostatic system which would actually use electrical attraction between your finger and the screen to change your tactile response.
See the video demo after the break.