Acoustic touch apparatus and method using touch sensitive Lamb waves
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United States of America Patent
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Jun 9, 2020
Grant Date -
Apr 27, 2017
app pub date -
Nov 11, 2016
filing date -
Mar 15, 2013
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Abstract
Systems and related methods providing for touch sensors using high sensitivity Lamb waves are disclosed herein. A touch controller may comprise circuitry having operating frequency characteristics, including an operating frequency f and a frequency spread Δf; and circuitry configured to minimize effects of dispersion based upon at least one of selected operating frequency characteristics relative to a frequency dependence of a group velocity of propagating waves and a frequency dependent phase error, wherein the touch controller generates an excitation signal.
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