The fingerprint scanners under the screen were interesting when they were first introduced in phones. But today, they are no longer attractive to users. We are practically at a stage where the implementation of technology has become so easy that more cost-effective devices can be found with this technology. Recent news about a new technology patented by Xiaomi points to a possible development in the new generation of fingerprint scanners under the screen. The patent was recently granted to the Chinese tech giant by the China National Patent Database and describes a full-screen fingerprint sensor. (Via Gizmochina)
The full-screen fingerprint scanner below the screen means you no longer have to place your finger in a specific area of the screen when unlocking your phone. You can unlock your smartphone by placing your finger anywhere on the screen. This feature is undoubtedly popular with many users and makes it much easier for them to unlock the phone, but achieving it is much more complicated than you think.
Behind the scenes of this new fingerprint scanner technology, under the display screen, there are a large number of infrared LED light transmitters that are located below the capacitive touch screen layer. . As you might have guessed, the job of transmitters is to transmit light that is reflected on your skin. The reflected light is then scanned by a layer of infrared light receivers, located between the touch screen layer - the outermost layer of the display - and the infrared LED light transmitters. Beneath all these layers and at the very bottom is the AMOLED display.
In other words, if we draw a mental image of the entire screen from top to bottom, it will look like this:
These types of sensors use an ultrasonic transmitter and receiver. This process involves the use of an ultrasonic pulse that is sent through the transmitter to the finger on the scanner. As soon as the pulse hits the finger, part of it is rejected and part is reflected. The reflected pulse is received by an ultrasonic receiver and a three-dimensional image of the fingerprint will be formed according to the pulse rate.
The strength of ultrasonic sensors is that they allow manufacturers to maintain quality in addition to Place them under the or metal or plastic body of the smartphone. However, their problem is the cost of production. Also, turning the entire screen into a large ultrasonic sensor is probably much more difficult. It remains to be seen how Xiaomi will make this display and use it in its smartphones.
Source: PhonearenaTags: xiaomi, patented, full-screen, fingerprint, sensor