CPC G06V 40/1306 (2022.01) [G01S 7/52079 (2013.01); G06F 21/32 (2013.01)] | 28 Claims |
1. An apparatus, comprising:
an ultrasonic sensor stack;
a display stack, comprising:
a display stiffener; and
display stack layers configured to cause ultrasonic waves transmitted by the ultrasonic sensor stack to have one or more display stack-induced local amplitude maxima in a first ultrasonic frequency range; and
a transmission enhancement layer configured to, when coupled with the display stiffener create a transmission enhancement resonator that has a lower acoustic impedance in the first ultrasonic frequency range than does the display stiffener without the display stiffener being coupled with the transmission enhancement layer.
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