https://www.cnet.com/news/galaxy-s10-in-screen-fingerprint-scanner-is-ultrasonic-heres-exactly-what-that-means/

The Galaxy S10's in-screen fingerprint reader comes with a col ripple effect.

"Security and biometrics have been integrating into mobile platforms at a rapid pace," Alex Katouzian, Qualcomm senior vice president of mobile technology, said in December at Qulalcomm's yearly tech summit in Hawaii. "This is the future of fingerprint technology."