Touch Sensitive Paper With Built-In Speakers 83
The Bongo King writes "There have been several stories about digital paper discussed here on the site recently, but an offering from Swedish research scientists has a new twist. They have made a prototype billboard of interactive paper with built-in flat loudspeakers apparently also made of paper. 'Touch sensors are made using a fine pattern of conductive lines in which the current flow is altered when a hand touches it. Laptop computer touchpads use the same principle. Speakers are made by printing electromagnets out of conductive ink and stretching the paper over a cavity like a speaker cone behind the billboard. The electromagnets vibrate in response to a current, creating a sound.'"
The Return of the Scroll (Score:3, Interesting)
The return of the scroll!
Electromagnetism? Why not piezos? (Score:3, Interesting)
Sounds like a lot of current and associated structure to get this to work.
Why not just use plastic piezoelectric benders? Then the paper will talk even when being held in free air.
(Or hasn't the patent on that expired yet?)
Re:Enviromental (Score:2, Interesting)
But why stop at birds? everywhere you put the sign in train stations, the rear / underside could be sensitive to (say) rats and might squark some ultrasonic move-along signal.
Re:Enviromental (Score:2, Interesting)