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
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Issued Date -
Aug 8, 2024
app pub date -
Feb 3, 2023
filing date -
Feb 3, 2023
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Abstract
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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