http://www.techradar.com/news/samsung-galaxy-s9-may-feature-this-new-in-screen-fingerprint-scanner

It’s likely only a matter of time before we start seeing in-screen fingerprint scanners on flagship phones, and in fact the wait might almost be over, as Synaptics has announced its own solution, and strongly hinted that the Samsung Galaxy S9 will use it.

The company’s Clear ID FS9500 is described as the “world’s first in-display fingerprint sensor for smartphones” and it apparently works even if your finger is wet or cold. It’s also supposedly twice as fast as 3D facial recognition.