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The Galaxy S10 has an ultrasound fingerprint reader. That's why you have to take care



The Galaxy S10's screen fingerprint reader can look the same as on the OnePlus 6T, but do not fool it. The flagship Samsung Galaxy S10 and S10 Plus are the first phones that use Qualcomm ultrasound fingerprint technology.

With regard to ultrasound in the doctor's office, this "3D Sonic Sensor" technology works by bouncing sound waves from the skin. It will capture your details through water, lotion and grease, at night or in bright daylight. Qualcomm also claims it's faster and much safer than the optical fingerprint sensor that you've seen on other phones before. This is because the ultrasound reader takes 3D capture of all the ridges and valleys that make up your skin, as opposed to a 2D image ̵

1; mostly a photo – that captures an optical reader using light, not sound waves.

The debate between ultrasound and optical fingerprint scanners is at a time when biometric security is on the rise. Screen fingerprint readers are a hot trend in the design of the phone, because they do not occupy any room on the face of the phone, and require less dipping than the sensor built into the phone's power button or back cover. This design is beautifully combined with moving towards the face with a screen with barely noticeable frames.

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The Galaxy S10 fingerprint reader comes with a throttling effect.


Sarah Tew / CNET

"Security and biometrics quickly integrated into mobile platforms," ​​Qulicomm senior vice president for mobile technology Qulcomm at Qulalcomm's annual technology summit in Hawaii said in December. "This is the future of fingerprint technology."

An ultrasonic fingerprint sensor built into the screen layers replaces the diaphragm scan as a biometric pickup sensor on the Galaxy S10 and S10 Plus in particular. (The Galaxy S10E has a traditional capacitive fingerprint reader on the power button). The aperture scan has existed since the Galaxy S7, so Samsung's withdrawal from it is a surprise. There are rumors that Google can make a 3D face scan in the next version of Android called Android Q .

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Why does an Ultrasound fingerprint reader of the Galaxy S10 matter?



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For an animated explanation of how ultrasound fingerprint scanners work, it's imperative to check the video in this story.

What is an "ultrasonic" fingerprint sensor?

3D Sonic Sensor The fingerprint sensor, developed by Qualcomm, uses sound waves. (this is a "sound" part) to "read" your fingerprint when you unlock the phone. The trend now is to insert this fingerprint sensor under the display so that you unlock the phone by placing a finger or thumb in the center of the screen – it's also called an on-screen fingerprint reader, but this type of sensor can also be present at home device button. CNET saw the prototype of this ultrasonic sensor in 2015.

In this case, the ultrasonic sensor is integrated into one of several layers that make up the display of your phone. When you place your finger on the target area, you touch the glass that is on top of the phone, not the sensor. But your skin sends a small electrical impulse that activates the sensor and forces it to do its job.

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OnePlus 6T was the first phone with an American carrier that had an (optical) screen fingerprint reader.


James Martin / CNET

How accurate does ultrasound sensor work?

When an electrical signal enters the sensor, it emits the sound waves that come back to the skin. The surface of your skin is not equal – the fingertip is a unique pattern of ridges and valleys that makes fingerprints a useful form of identification. These ultrasonic waves are returned to the processor, which reflects your imprint on the basis of reading the sound of the sound wave that is reflected from your skin. In particular, he calculates different voltage levels based on your crests and valleys.

In a simplified example, say that your ranges are 1 and your valley is 0. The ultrasonic sensor module can display this data to form details of the 3D image of your fingerprint. Sound waves can also detect the flow of blood and reject impressions from the torn fingers. It can not be fooled by fake fingers or synthetic leather.

Ultrasound or Optical Fingerprint Reader: How Different?

The optical fingerprint reader – similar to what works from the Synaptics component manufacturer – was first seen on Vivo phones – bounce light to the finger and back to the sensor, which interprets reading as a 2D image. In fact, it does a photo of a finger to determine the pattern of ridges and valleys. But experts argue that this approach is easier to cheat by photographing, transmitting fingerprints (for example, if someone has lifted your print) or a fingerprint denture.

Qualcomm claims that his ultrasonic fingerprint sensor is powerful enough to read 4 millimeters deep when he scans the print. This is the level of pores. We have not yet tried the ultrasound fingerprint scanner of the Galaxy S10, so we can not say for sure if that's right. But it's likely that everyone in the security community will check it to the limit.

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Good bye, capacitive fingerprint reader .. Hi, ultrasound.


Angela Lang / CNET

How is ultrasound different from a physical fingerprint reader?

When you place your finger on a smooth reader on the back, side, or home button of your phone, your fingerprints are captured by the capacitive fingerprint sensor. Yes, "capacitive" is the same term that applies to the touch screen of your phone, where your finger allows you to track the amount of electric charge for the display to feel where you touch.

This is the same case. Capacitors on the entire scanner detect the placement of finger rollers by measuring the electric charge, and then match the pattern of these charges to the registered fingers.

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Jessica Dolcott / CNET

What is the advantage of using this face identification and other face unlock features?

The face of Apple uses a depth map made up of 30,000 infrared points to display facial contours. Samsung used competing technologies to scan iris, but took them off for new phones. The Galaxy S10 phones use the third method, which is baked in Google Android, which essentially makes a photo of your face. Face ID and aperture scans are considered to be safe enough to be used for mobile payments, but the Face Piece option on Android Pie does not support mobile payments. This is for convenience, but will not give you strong protection.

Samsung may have encountered difficulties in having the front three-dimensional facial scanner work in time to launch the Galaxy S10. It is also possible that Samsung recognizes its fate to Google's support in order to save money on investments that may take up to a few months. It will not be completely out of the box that Samsung wanted to save the Face ID-style option for the August Galaxy Note 10.

Regardless of the plan, regardless of the motivation, it is likely that the ultrasonic fingerprint reader will remain on the screen for several generations – especially , if it turns out to be as fast, convenient and safe as the Qualcomm says.

Published: December 4, 2018
Update : February 21, 2019 at 10:01 pm PT.


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