https://wccftech.com/qualcomm-executive-optical-sensors-inferior-3d-ultrasonic-fingerprint/

Last year, Qualcomm introduced its first ultrasonic in-display fingerprint scanner, called the 3D Sonic Sensor. The company has now followed up with its 3D Sonic Max, which it says is bigger and better in every way possible. Moreover, the chipmaker also believes that ultrasonic readers are better than their optical counterparts and an executive explains why that is.

In contrast to optical in-display fingerprint readers that create a 2D image, Qualcomm’s ultrasonic sensors create a 3D impression. Theoretically, the chipmaker’s offering should have been more reliable, but as we saw, that wasn’t the case. The Samsung Galaxy S10 and Note 10, which used the 3D Sonic Sensor were blacklisted by some financial institutions because of the ease with which the fingerprint reader could be spoofed. However, Keith Kressin, Senior Vice President of product management for Qualcomm still believes that ultrasonic sensors provide better security than their optical counterparts.