Touch screen using echo-location

Details Touch screen using echo-location Touch screen using echo-location

2006-07-18

2006-07-18

Shankar, Vijay (Department: 2673)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S177000

Reexamination Certificate

active

07079118

ABSTRACT:
A plurality of acoustic wave transducers are coupled to a substrate at predetermined spaced apart locations. At least one of the transducers is operative to emit an acoustic wave that propagates along the substrate, with the other transducers operating as receivers of acoustic waves. The receivers are coupled to a control system that is operative to determine a location at which the substrate is perturbed based on time associated with travel of an acoustic wave from a transmitter, to the location of the perturbation, and from the perturbation to each of the respective receivers.

REFERENCES:
patent: 6335723 (2002-01-01), Wood et al.
patent: 6441809 (2002-08-01), Kent et al.
patent: 6723929 (2004-04-01), Kent
patent: 6741237 (2004-05-01), Benard et al.

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