https://wccftech.com/galaxy-s10-optical-fingerprint-sensor-patent/

Although a handful of the smartphones on the market feature an in-display fingerprint sensor, the Galaxy S10 would reportedly be Samsung’s first smartphone to come with such a solution. So far, it was assumed that Samsung will procure Qualcomm’s Ultrasonic fingerprint scanner for its upcoming smartphone, but a recently discovered patent seems to state otherwise.

Samsung submitted a patent to WIPO back in April and it was published on October 18, 2018. Titled ‘Biometric sensor and device including the same’, the sensor details the working of an optical in-screen fingerprint scanner.