How In Display Finger Print Sensor Works In Mobile Phone

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Fingerprint scanner in the mobile phone is no longer a premium features nowadays. Technologies getting cheaper day by day and premium features are getting offered in low budget phones. In recent time, fingerprint scanner technology evolved like anything and there are many types of fingerprint scanner options available in mobiles phones. So in this article, we will talk about different types of fingerprint scanning technology and How In-Display Finger Print Sensor Works In Mobile Phone

We might all know that all our fingerprints are unique. Our fingerprint differentiates us from others. And that’s the reason, for granting privileges fingerprint authentication is widely used. Fingerprint authentication is also the more secure authentication method compare to other methods like Pin, Password or Face.

Fingerprint scanners were first introduced in Motorola smartphones in 2011 and after that, it becomes very popular. Nowadays even the budget smartphone comes with the fingerprint scanner. Thanks to evolving market which helps to get new technologies at a cheaper price.

We might be wondering how could fingerprint scanner response so fast. How does a fingerprint can be placed in a tiny space of smartphones? How can a fingerprint scanners scan our fingers? We will come to know about all these in this article.

What is a fingerprint scanner

A fingerprint scanner scans your fingers and matches the same with the one already stored in their database. If your fingerprint matches with the one stored then authentication will be approved. Else error will pop up that authentication is failed.


Also Read: Evolution of cellphone battery


How fingerprint scanner works

Typical scanners differentiate your fingerprint based on the ridges and valleys available in your fingerprint. If your fingerprint would be smooth, then fingerprint would exist. We will learn more about how different fingerprint work as we move on in this article.

Types of a fingerprint scanner

Fingerprint scanners are broadly categorized into three types.

  • Optical fingerprint scanner
  • Capacitive fingerprint scanner
  • Ultrasound fingerprint scanner.

Optical Fingerprint Scanner

Optical fingerprint type is the oldest fingerprint scanning technology that is still widely used in low-cost devices. It uses a camera to capture images and matches them with the one that was stored. If a match is found, access gets authenticated. The camera differentiates your fingerprint images based on ridges and valley available.

in-display fingerprint sensor

When you place your finger on the fingerprint camera, the area becomes dark and led illuminates that area to captures the image. The main issue with an optical fingerprint is that you can easily manipulate the optical fingerprint scanner. Since it authenticates purely based on images so if you even scan an image of your finger that might also work. Though it’s not that easy but professional can easily manipulate it.

The optical sensor was rarely used in a mobile phone as this technology requires bulky hardware which can not be accommodated in a cell phone. Mobile is very slim nowadays and optical sensor can’t get space to fit into. However, this is widely used incorporates, bank etc.

Capacitive Fingerprint Scanner

Almost 90% of smartphones come with capacitive scanner nowadays. Usually placed at the back of the phone except for iPhone where it is placed at the front. It is very fast to authenticate and security concerns are almost eliminated.

in-display fingerprint sensor

Capacitive scanners use a capacitor instead if optics in optics sensor. It differentiates your fingerprints based on the change of capacitance. This is the same way our touch screen works. When we touch the surface for scanning fingerprint, systems measure the change in capacitance. Our fingers have ridges and valleys. Ridges changes the capacitance but valleys do not make any change. So the system connects all measured points for the ridges and creates the fingerprint to match it with the one stored in the system.

Ultrasound Fingerprint Scanner

Ultrasound Fingerprint scanner works on the sound waves. Hardware is specially designed to send pulses to the system and measured his much it bounces back. Ridges and valleys bounce back ultrasonic sounds differently. Based on that the ultrasound Fingerprint scanners create a 3D map if finger and matches it with the one in the system to authenticate.

in-display fingerprint sensor

Ultrasound scanners are expensive and likely come with Samsung’s premium phones. These fingerprint scanners are the fastest and most secure. It is impossible to bypass it compare to the optical sensor.

What technology In-display scanner uses

Well, that’s really interesting that nowadays almost all premium phones are coming with In-Display fingerprint scanner. Surprisingly it uses the optical scanner technology which is very insecure. But since the scanner is on the display so we can not have capacitive scanners. Ultrasonic sensors can also be placed under the display. But it is a bit expensive and many companies do not prefer that.

Ultrasound scanners can penetrate the sound waves through the display. Hardware used in this type of scanners is very compact and ideal for slim smartphones.

Where else fingerprint scanners come into play

Apart from smartphones fingerprints are widely used in laptops. Mostly capacitive fingerprint scanners are used in a laptop. This type of scanners are used in corporates for authentication and getting into offices. Recently fingerprints are used in Banks to authenticate the account owner.

Now a day’s many apartments use biometric scanners which are mostly optical scanners. In fact, new technologies are coming up to incorporates fingerprint in cars as well no production models are yet in the market.

Let’s Wrap Up!

New fingerprint scanning technology is evolving nowadays and expected to innovate new technologies. As of now in smartphone, optical In-Display scanners are the latest trend and it is expected that for the next few years it will be in the market along with ultrasound scanner.

That’s all we have in this article. Hope you liked the article and found some useful information. If you have any queries please do write in the comment section and I will be happy to answer. If you find this article helpful please rate us five stars.

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