Water droplet rejection for capacitive micromachined ultrasonic transducer (CMUT) touch sensing based on spatial distribution of CMUT receivers

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United States of America Patent

PATENT NO 12204724
APP PUB NO 20240264703A1
SERIAL NO

18164152

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An ultrasonic touch sensor includes a touch structure configured to receive a touch; a transmitter arrangement configured to transmit one or more ultrasonic transmit waves toward the touch structure; a receiver arrangement configured to receive ultrasonic reflected waves produced by reflections of the one or more ultrasonic transmit waves and generate a plurality of measurement signals representative of the ultrasonic reflected waves; and a measurement circuit configured to measure a degree of variation of a plurality of measurement signals, compare the degree of variation with a detection threshold, and determine whether a no-touch event or a touch event has occurred at the touch structure based on whether the degree of variation satisfies the detection threshold.

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Patent Owner(s)

  • INFINEON TECHNOLOGIES AG

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Landgraf, Erhard Dresden, DE 31 314
Stoicescu, Emanuel Bucharest, RO 13 16

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