Official Patent Reveals How Xiaomi's All-Screen Fingerprint Scanner Will Work

OnePlus 7 Pro AH NS 19 fingerprint scanner

Under-display fingerprint scanner, when introduced sometime back in 2017, blew the minds of the tech enthusiast. Later, smartphone brands started including an under-display fingerprint scanner on their premium smartphones.

Fast forward to now, you can find this under-display fingerprint technology on almost all ranges of smartphones, right from mid-range to even a few budget phones.

Technology, however, seems like it did not grow after this tech. Apparently, it is a bit difficult to innovate a fingerprint scanner. Samsung (ultrasonic scanner) and other brands came with their own version of fingerprint scanners, but that was it.

Thankfully, it seems like Xiaomi is about to change the future of underscreen fingerprint scanner technology. Because as per an official patent, from the Chinese national patent database (via Gizmochina) reveals Xiaomi has been successfully awarded the patent for an all-screen fingerprint scanner.


This means it would allow users to unlock their devices by touching any part of their device’s screen. Notably, this is something that many smartphone users were demanding for quite some time.

Currently, you need to place your finger on the exact location of the fingerprint scanner in order for the device to recognize your fingerprint and unlock it.

Patent shows LED light transmitters and receivers are the core for this all-screen fingerprint tech

Thanks to the patent, you can really understand how this all-screen fingerprint technology developed by Xiaomi will work. Xiaomi’s patent shows that an array of infrared LED light transmitters will be placed underneath the layer of the capacitive touch screen.

This array of LED light transmitters will also be placed above the normal AMOLED display. Next, the array of infrared light receivers will be placed above the infrared LED light transmitters.


So, all this makes at least one thing very clear. LED light transmitters and receivers are the core for this all-screen technology that Xiaomi has successfully patented.

Now, coming to the process of how it works. When a user will touch the screen with his/her finger, the touch screen will immediately register the touch response. Simultaneously, it will also register the position and shape of the fingertip.

The LED transmitters will emit the light at only the desired shape and position of the fingertip area. During this time, other parts of the screen will remain inactive, and the surrounding LED transmitter won’t light up.

Infrared light will be reflected back from the fingertip and will be projected onto the light receivers. After it successfully maps out all the important data of your fingertip, it will compare it with the saved fingerprint details.


When it finds that the mapped data is the same as the one which is saved, the user will be able to unlock the phone. Xiaomi plans to bring this technology to all its future smartphones, which we hope it does soon.

xiaomi all screen fingerprint scanner patent