Patent ID: 8194053

Claim:
A touch panel comprising: a first transparent substrate; a plurality of first transparent electrodes having a strip shape on the first transparent substrate; a plurality of piezoelectric nanowires vertically on the first transparent electrodes; a plurality of second transparent electrodes having a strip shape to perpendicularly cross the plurality of first transparent electrodes on the plurality of the piezoelectric nanowires; a second transparent substrate on the plurality of second transparent electrodes; an ultrasonic wave generator configured to generate an ultrasonic wave from the plurality of piezoelectric nanowires by applying a pulse voltage to the ultrasonic wave generator; and at least one ultrasonic wave echo sensor configured to detect ultrasonic waves that are generated from the plurality of piezoelectric nanowires and returned to the plurality of piezoelectric nanowires after colliding with an object approaching the plurality of piezoelectric nanowires.