Tactile computer interface with electromagnets

A team at the Media Computing Group at Aachen University figured out how to put a series of electromagnets underneath a display toprovide haptic feedback for touchscreens. They showed off their tech at the 2011 UIST conference and made their paper available. 

For the FingerFlux, as the team likes to call it, a bed of tiny electromagnets is placed underneath a panel display. The user wears a ‘thimble’ with an attached permanent magnet. Driving the bed of electromagnets slightly moves the magnet and provides a little bit of  sensation to the user. including the ability to draw your finger towards an item on the screen, and "lock" it in a certain area. What's particularly key, however, is that you're also able to feel a bit of feedback before you even touch the screen -- as opposed to other entirely screen-based options -- which could could let you operate something like media player controls without actually looking at your phone. Of course, it's all still a long ways from being shrunk down to phone-size, but the researchers do have a working prototype in a table-top device. The FingerFlux can be used to provide haptic feedback like a keyboard. The system can also be used to model constraints – making sure that users don’t move outside the controls they operate, and can guide the user to the desired button.

A bed of electromagnets would be a welcome addition to tablets, if only to prevent typung luje rhus.

via :: www.http://hackaday.com