A few days ago, Vivo showed a new phone where fingerprint scanner was placed under the display. You may have a confusion about how it works. Now, we are going to explain the working principle of the fingerprint sensor under the display in Vivo’s new phone.

Why did Vivo choose under display fingerprint sensor?

In 2018, security has become so important that pin, pattern, and password are not just enough. Series of smartphones have been launched where fingerprint sensor is regarded as a compulsion to be present. Also, the users have been attracted to bezel-less display in 2017. There is no place for the front fingerprint scanner in the bezel-less displays.

The companies either have to put a fingerprint scanner on the back of the phone or bring a new feature like face unlock and so on. The company Vivo kept this thing in mind and wanted to keep fingerprint sensor under the display so that users will find more convenient to use fingerprint scanner and many users will be attracted to use the phone with new technology.

The company named Synaptics developed a solution to this problem and Vivo implemented this on their new smartphone. There are two types of fingerprint scanners. One is optical and the other is capacitive. The optical fingerprint scanner is colorful scanner where you have to put your finger and it is scanned. It is the cheapest scanner. In this scanner, the light from the system strikes your finger and some portion of the light is refracted through the finger due to which image is formed.

The image is regarded as the map of your finger which is saved in the system. When you put your finger for the next time, it will validate whether the images formed matches the initially formed image or not. This system is not much reliable because if any material where the image of the finger is present or a plastic where your finger has shown impressions is placed in the system, it will be given access.

Optical Fingerprint Scanner
Optical Fingerprint Scanner

Due to this disadvantage, the new smartphones implemented capacitive techniques. In capacitive fingerprint scanners, when you introduce your finger the air column is left where the part of the finger is low and some part of your finger is attached to the system. There is a strong electric circuit present in the system. After all these, some part of the system is activated and the remaining part is left as it was. Electronic map is prepared at last. By taking this map prepared further results are seen. In this case, the system is more secure and the sheets of plastic where fingerprint was introduced do not tend to work.

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Now, if the sensor has to be kept under the display. how should they be kept? There are two types of display present. One is LCD and other is OLED. In LCS display, the backlight should be provided from the back of the display and there won’t be any place for placing the sensor. In case of OLED, the backlight is not necessary. It works on the basis of pixels. So, the sensor can be introduced in between the pixels. Here, Synaptics has also taken optical principle in the scanner.

So, whenever there is the introduction of a finger, the light will be sent to identify the finger used. The scanner is quite slower at the initial stage but will surely become fast as there is an advancement in technology each day. This fingerprint scanner was planned to be implemented in Samsung Galaxy S8 last year but the project took a long time to be finished. Due to this reason, it was not used in the flagship device last year.

Will any other phone implement this technology?

This year, this scanner may be used by Samsung in its smartphone. We do not know whether Apple will implement this technology or not. Qualcomm has also put forward towards the development of Ultrasonic fingerprint scanner. Here, the ultrasonic waves will be used to capture the finger and the disturbance will be the main elements to capture your finger.

Hope you understood the reason behind the fingerprint scanner on the back of the display. In short, the scanner can be used only on the phone having OLED display where the sensor can be placed in the gaps present between the pixels and is used in Vivo for the first time. In 2018, we expect many smartphones to use this principle.

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