Elo Touch Solutions, Inc.

Masao Takeuchi

Joel Christopher Kent

David S Hecht

Daniel H Scharff

Kyu-Tak Son

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 &#x394;f; 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.

Acoustic touch apparatus and method using touch sensitive Lamb waves

Systems and related methods providing for touch sensors using high sensitivity Lamb waves are disclosed herein. A touch apparatus may include a substrate having a front surface and a back surface, where the touch region is on the front surface. The touch apparatus may be configured to propagate surface acoustic waves on at least a portion of the back surface and high sensitivity lamb waves, such as near-longitudinal-resonance Lamb waves, in at least a portion of the touch region of the substrate. The touch system may further include circuitry configured to determine a location of a touch on the front surface based on received attenuations in the high sensitivity Lamb waves. Some embodiments may provide for bezel-less touch sensor designs and anti-dispersion techniques that enhance touch sensor reliability.

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Yokohama, Japan

Masao Takeuchi