It is not yet mentioned how the technology exactly works but we can get an idea from the Samsung patent where they used 12 pressure point sensors sandwiched between cover glass and display panel where the scanner passes
ultrasonic signals through an OLED to read the contours of a fingerprint without making direct contact.
The new scanner passes
ultrasonic signals through an OLED panel up to 1200 μm thick to read the contours of a fingerprint, which obviate the need for a direct touch with the fingerprint sensor.
Not exact matches
They suspended the pieces of meat in the water tank and found that the
ultrasonic signal passed
through both types of meat at speeds of up to 30 megabits a second.
They suspended the pieces of meat in a water tank and found that an
ultrasonic signal passed
through both types of meat at speeds of up to 30 megabits a second.
The under - display scanner makes use of
ultrasonic signals that can scan
through an OLED panel up to 1200 μm thick.