There have been rumours of Apple exploring under-display fingerprint scanning technology, but you probably didn't expect the first of such demos to come from China. At MWC Shanghai, Qualcomm announced its latest ultrasonic fingerprint solution, with the new highlights being its integration underneath OLED displays (up to 1.2mm-thick), as well as working fine even when the device is immersed in water. As before, this tech can tolerate dirt and sweat on skin better than its capacitive counterpart, and it also works underneath metal and glass (duh) but with increased penetration -- up to 800um for glass and up to 650um for aluminum, as opposed to the old 400um for either material.