In-display fingerprint sensor technology was indeed something very new and exciting when it first debuted a few years ago, but now the technology has become a ubiquitous thing and not much else. things to mention.
Even mid-range and low-cost smartphones can be equipped with this technology, making it less special and sought after. However, only Apple is still not using the fingerprint sensor under the screen on its iPhones, possibly because Apple thinks the technology is still not really complete.
However, Xiaomi will probably make Apple change that mind, by taking its fingerprint sensor technology under the screen to the next level. The Chinese smartphone maker has just applied for a patent for full-screen fingerprint sensor technology, a big step forward that will completely change the user experience.
An under-display fingerprint sensor has full-screen coverage, meaning you won’t have to worry about where your finger is when unlocking your smartphone like before. If you think this is just a small change, then you are definitely wrong.
As for the fingerprint sensor on the traditional Home button, you can easily place your finger correctly without having to look or align anything. But with the fingerprint sensor under the screen, placing your finger correctly on the sensor position below is really much more difficult. As a result, unlocking a smartphone, which seems to be very simple, becomes complicated and annoying.
According to the latest Xiaomi patent, the full-screen fingerprint sensor technology will use a multitude of infrared LEDs, placed below the touch layer of the screen. These LEDs will project light, and the light will reflect upon contact with the user’s finger. The reflected light is recorded by a layer of infrared light receivers, sandwiched between the touch layer and the outermost layer of the display. At the bottom is a regular AMOLED panel.
If arranged in order, then at the top will be the capacitive touch layer, then the infrared light-collecting layer, then the infrared light-emitting LED and finally the AMOLED panel.
However, Xiaomi’s new technology still faces a limitation, because it is still an optical fingerprint sensor, not an ultrasonic fingerprint sensor like Samsung’s. The ultrasonic fingerprint sensor under the screen is considered to have higher accuracy and response speed than the optical fingerprint sensor. However, using a full-screen ultrasonic fingerprint sensor is not possible.
We may see Xiaomi smartphones equipped with full-screen fingerprint sensors in the not too distant future.