Patent ID: 6762753
Filing Date: 2004-07-13
Classification: G06F

Abstract:
A touch panel device for detecting a position of an object by using a surface acoustic wave, comprising:a plurality of input IDTs, disposed to correspond to a plurality of tracks of a substrate where the surface acoustic wave can be propagated, respectively, for exciting surface acoustic waves; and a plurality of output IDTs, disposed to correspond to said plurality of tracks, respectively, for receiving the surface acoustic waves which have been excited by said plurality of input IDTs and propagated along said substrate, wherein each of said plurality of input IDTs has a wideband electrode structure, and each of said plurality of output IDTs has a matched filter structure for obtaining an output signal upon receipt of a specific signal sequence, the specific signal sequence varying according to each of said plurality of tracks; an application unit for generating the mutually different specific signal sequences in time series and simultaneously applying the generated time-series signal sequences to said plurality of input IDTs, respectively; and a detection unit for synthesizing output signals of said plurality of output IDTs and detecting a position of a track on which the object exists, based on a result of the synthesis.