How mobile in display fingerprint work?

 

This question must be roaming in your mind that how does this work?

if you know already this  so shere your friends

This in-display fingerprint only works on OLED and AMOLED displays.

If you want to know mobile display so prees this link,l

Principal:(  in simple language ) There is a camera under the display of your mobile which takes a photo of your finger
and stores it and matches it for unlock.

There are two types of method 

1)Optical 

2)Ultrasonic 

Optical:-Simply put, optical in-screen fingerprint scanners work by projecting light.

The functioning area of the in-screen scanner (which you can see in the image above) illuminates the finger. Then, a sensor or camera underneath the screen capture an image of the finger. And then compared to the stored
version on the phone and, if it matches, it’s unlocked. 

Ultrasonic:-While optical is an older technology, ultrasonic is currently new technology. Specifically, this is the method used on the flagship phones .

Instead of using light— ultrasonic (AKA high frequency sound) waves.When you place your finger on the scanner, an ultrasonic wave is produced, which interacts with the finger’s skin and bounces back.

In other words, the ultrasonic method creates a 3D map of a your finger , as compared to the flat image of the optical approach.  means it’ll work better if your fingers are wet or dirty.

This ultrasonic method also has large security compared to optical method.