| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the precise detection of touch position through driving with low power consumption. SOLUTION: When an electric signal is inputted to interdigital electrodes TX0 , TY0 , TX1 , TX2 , TY1 and TY2 , a surface acoustic wave is excited on the side of a piezoelectric substrate 1 having the interidigital electrodes and converted out to an electric signal having a phaseθbase at interdigital electrodes RX0 and RY0 . At the same time, it is converted to electric signals Ej (j=1, 2...x) having phasesθj (j=1, 2...x) at an interdigital electrode RX11 or the like. When a position FX is touched among positions Fj (j=1, 2...x) between interdigital electrodes TX1 and RX11 , an electric signal E having a phaseθis outputted at the interdigital electrode RX11 . At such a time, the touch position FX can be detected form the difference of phasesθbase andθ.</p> |
