Technology is a never-ending game of innovation. In less than a decade, we’ve moved from punching PINs to using Face Unlock as authentication measure on our phones. And just as we were thinking that it couldn’t get better, we have a brand new innovation which is taking the tech world by storm: the in-display fingerprint sensor.

How Does the Under-display Fingerprint Sensor Work?

An under-display fingerprint sensor uses an optical fingerprint sensor to capture the fingerprint data and is embedded under the mobile phone’s screen.

It works by capturing the reflected light of the fingerprint through the OLED pixels. So, when you touch the phone’s screen, the display lights up to illuminate the fingerprint. The sensor then captures a high-resolution of your fingerprint image through the light reflected from the gaps between the pixels. 

To ensure that the fingerprint data is being read accurately by the sensor, you’d need to press the screen slightly. This is done so that the sensor is able to differentiate between the ridges and valleys of each fingerprint, even include the layer 3 info like Sweat Pore etc.  

What Are the Advantages of Under-Display Fingerprint Sensor?

1. Perfectly answer to the trend of full-size display in mobile phone design. Some manufacturers shift the fingerprint sensors to the rear side, but it raised quite a number of issues.  For example, if the phone is lying on the desk then you’d have to pick it up to unlock it.  The situation is even worse if the phone is hooked to a car mount.   

2. The under-display fingerprint sensors have great improvement in working for both dry, wet or cold finger compared to the existing capacitance type sensors.

3. It is easier, faster than any other personal authentication methods, like Face ID, Iris, Palm.  To the manufecturers, it is alsoa  much cheaper solution.    

Photo by Devin Edwards on Unsplash