Display Fingerprint Scanner - How do they work?

Display-fingerprint-scanner

The display fingerprint scanner does the same job as a traditional fingerprint scanner. But optical sensor or ultrasonic sensors are used instead of capacitive sensors...

Technology is constantly changing and innovation is catching up. New technologies are emerging, and they are simplifying all our work by combining them with our daily use. This change in technology and the excellence of new technology will never end. The world of technology has changed drastically in the past two decades. Our new means of communication have evolved and become much more accessible.

Smartphones have become our daily necessities. In addition to general communication, we do a lot of work with smartphones. Media sharing, Internet surfing, money transactions, shopping, submitting and exchanging important information are now done by smartphones. The security context of this device comes when we use a device in so many ways. How safe can we keep the information on our smartphone?

That's why security experts and smartphone makers are constantly innovating new ways to ensure smartphone security. With the use of passwords and patterns, biometric methods are also being used. Fingerprints and facial recognition are now being used to protect mobile phones.

In the past, biometric methods were used in computer security systems, which are now used on mobile phones. All the biometric security systems used on mobile phones have some good and some bad aspects. So all these problems are constantly being tried and new methods are being used. I would like to tell you today about a biometric security system like this. So let's find out what is a Display fingerprint scanner.



What is a fingerprint?

Fingerprint-scanner
We have numerous tiny lines in our fingers. Which we all see. When we put our hand in something or take something in our hand, our fingerprints are placed on that object. This impression is called fingerprint.

Every human's fingertip is different. This line does not match with anyone. The difference between these lines is when the fingerprint is detected. Initially, fingerprints were used in forensic work to diagnose delinquents. But now fingerprints are used in biometric security systems. With the advancement of technology, fingerprints are now being detected by digital electronic devices.

The electronic device used to diagnose a fingerprint is called a fingerprint scanner or reader. Fingerprints are first used in biometric systems with the use of patterns and passwords for security. Next comes the Facial Recognition.

The first fingerprint technology was used on mobile phones in the 20th. South Korean company Pantech uses the first fingerprint technology on their GI100 phones. The fingerprint technology used in the GI100 was not as advanced.

As many of us know, Apple is the first to use fingerprint technology on their iPhone 5s. That is actually our misconception. Apple revolutionizes modern fingerprint technology. Fingerprints are becoming more popular with Apple after using this technology on their phones. From then on all other companies started using fingerprints on their mobile phones.


The type of reader or sensor used to detect fingerprints on mobile phones is 3 types.

  1. Capacitive sensor
  2. Optical sensor
  3. Ultrasonic sensor


What is display fingerprint scanner?

We are accustomed to seeing fingerprint scanners or sensors used on mobile phones on the back of mobile phones and on the Home button. There are some advantages and disadvantages of installing this scanner either front or back. If the fingerprint scanner is back panel of the phone, and the phone placed on the table then the phone can't be unlocked. Again if the fingerprint scanner is in front of the phone, it is not possible to bezel-less the phone's design. So the best place for a scanner is below the display.

"How strange it is to think, isn't it? Fingerprint scanner still below the display? Does the phone recognize fingerprints exactly as before?"

Yes, will do it. Surprisingly, the thing is quite simple. Using the same method and algorithm as the normal fingerprint, it will detect fingerprints and ensure the security of the phone.

Earlier, capacitive sensors were used on the back, front and sides of the phone. But below the display, this doesn't work. This is because the finger is read directly on the sensor. So, in this case, you need to use sensors that do not need to touch directly.


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Optical and Ultrasonic sensors solve this problem. These two sensors capture high-resolution pictures of the fingers. Then it creates a 3D geometric map of this image by a special algorithm. In the photo map, only the fingerprints are folded. Each fold has high-quality detail. The algorithm distinguishes between each fold. So that anyone other than the user of the phone tries to open the lock, his fingerprint can be detected.

Chinese mobile maker Vivo is the first to unveil a display fingerprint phone. In 2018, Vivo Company launched Vivo X20 Plus UD with an in-display fingerprint scanner.

Optical fingerprint scanner

The optical fingerprint reader is actually a tiny camera, which is mounted below the display. High-resolution pictures of the fingers are taken with this camera. From which the fingerprint is subsequently diagnosed. A hole is made at a specific point inside the display to take a picture of the camera, from which the camera takes a picture of the finger placed on the display.

Putting a finger on the display's camera pores will not cause any light on the camera. No camera can take pictures without light. For this reason, the light is highlighted with the display of the finger placed on the camera hole. Not all types of light are suitable for optical fingerprint readers again.



OnePlus used the Optical fingerprint scanner on their Oneplus 6T mobiles, Oneplus said they have seen many types of lighting and green light can provide the best detail for pictures so they have used green light.

Ultrasonic fingerprint scanner

Ultrasonic Scanner launches a new chapter in the smartphone world. Ultrasonic scanners are the most advanced technology and the most efficient. Qualcomm is the first to launch a 3D ultrasonic scanner for mobile phones.

This type of scanner is fingerprinted by high-frequency sound. The transmitter and receiver have two parts inside the scanner. The transmitter transmits high-frequency sound that resonates with the finger and returns to the scanner, and the receiver portion of the scanner receives that echo sound.



The sound of this frequency is beyond human hearing capacity. The receiver portion is not a microphone, which is a sensor used to calculate the speed and distance of a sound wave returning to the fingertip.

3D image of the finger line is created by the sound of high frequency. From which all the differences of fingerprints are extracted. The process of sending and receiving receiver sounds from the transmitter is done several times. To accurately distinguish fingerprints.

Ultrasonic scanners are much safer and more accurate than capacitive scanners. However, finger scanning takes a little longer, so the ultrasonic scanner is less dynamic than the capacitive scanner. But faster than an optical scanner. The Samsung Galaxy S10 is the world's first smartphone with an ultrasonic scanner.

If the difference between an optical and a20n ultrasonic scanner is that the ultrasonic scanner is more useful in all respects. Ultrasonic is much more dynamic and accurate than optical. With dust, wet fingers and a screen protector, it works better than the optical scanner. Also, no light is required on the display for ultrasonic scanners to work.

Now let's get to know some more important things about display fingerprints. In-display and under-display fingerprints We hear a lot of these words now and we have no difficulty understanding that two things are the same. But there are differences between them.

In-display and under-display fingerprints, these are used for fingerprint scanning and correlation with the display. But their position is two different places in the display and these two are never one thing. Let's know.


The in-display fingerprint scanner is located in the middle of the display. Protection glass is mounted on the display. On top of which we work by touching the finger. There are more things associated with this glass, such as the Touch Digitizer, positioned just below the main display and below it is the Module Board. It holds all the parts of the display together. The in-display fingerprint sensor is connected to the main display inside the Module Board. The advantage of using a scanner is that the finger can be placed anywhere on the display for scanning.
The Under-Display Fingerprint Scanner Display is inside the Module Board but remains outside the original display. A small hole is made in the display for the scanner to work. Through which the scanner can take a picture of the finger. In-display fingerprints, such as under-display fingerprints, do not require any perforation on the original display. This is because the fingerprint scanner is connected to the main display panel.

Advantages of the Display fingerprint scanner

The display fingerprint scanner is much thinner than the Traditional Capacitive Fingerprint Scanner. Which helps reduce the smartphone's tiredness. This type of fingerprint only works on the OLED panel, allowing users to use the high-quality display on their phones. Having a scanner underneath the display has many advantages over opening the phone lock. For example, the lock can be opened on the table without taking the phone in your hand. Ultrasonic scanners also open the phone lock with a wet finger, which is not possible with other scanners.

Normally the display fingerprint scanner is at the bottom of the phone so the phone lock can be opened in any case. For example, it is much more convenient to have a phone on the dashboard while driving. This type of fingerprint is more useful in security. All security measures have been kept in place so that no fingerprint can be duplicated and the lock of the display fingerprint phone has not been opened with the duplicated fingerprint. So it's still a very safe system for us.

The disadvantage of a Display fingerprint scanner

With the introduction of new technologies, problems arise. Display fingerprint is slower than all fingerprint scanners used before. Occasionally finger scanning does not recognize registered fingerprints or does not work properly during scanning. No screen protector can be mounted on the display, so the fingerprint does not work well. The scanner does not recognize fingerprints when using tempered glass. Also, the scanner does not work if the screen has stains, dirt and fingers wet. The biggest problem is that this type of scanner doesn't work on a typical display panel (TFT, IPS etc). Only OLED panels work, which is the smartphone's most expensive display panel. So at the moment, the low-end smartphone cannot be expected to have a display fingerprint scanner.

The future

Smartphone designs are constantly changing. The new design is loved by everyone. For the convenience of working, now all mobile companies are offering big display on their phones. This is why smartphone design has been changed in some ways. By designing the Edge-to-Edge display, it is possible to increase the display size by keeping the phone smaller. That is why the fingerprint on the front of the phone is being given in the display. As a result, the cost of preparing the mobile is reduced and the mobile phone can be thinned.

Display fingerprint technology for fingerprint system is slowly gaining popularity and display fingerprint-like capacitive fingerprint will be used on all smartphones at one time. All mobile phone makers are now working on display fingerprints, how to use it on a low-cost smartphone and how to make it more secure.

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In the future, we will see the use of many high-speed scanners on smartphones. Many scanners will be used throughout the display so that scanning can be done by placing a finger anywhere on the display. Scanning the entire display with just one scanner, and at the same time, there is work on how to make the scanning more dynamic.

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Display Fingerprint Scanner - How do they work? Display Fingerprint Scanner - How do they work? Reviewed by Kanu Ray on Saturday, February 16, 2019 Rating: 5

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