According to a video posted by YouTuber Zack Nelson on his page “JerryRigEverything” shows that the in-display fingerprint scanner does not work if display glass is broken.
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Samsung Galaxy S10 and Galaxy S10 Plus have got some industry-features, and one of them is the under-display fingerprint sensor. This scanner is an ultrasonic sensor that uses sound waves to read fingerprints and map the peaks and valleys on a fingerprint to authenticate the user. Since a lot is not known about the technology’s working in real life conditions, YouTuber Zack Nelson, who tests phones' durability on his videos under “JerryRigEverything”, gives a hint on how and where a user could face problems with this tech. According to his latest video, the sensor works with minor scratches but fails to recognise the fingerprint if display glass breaks.
The video shows the Samsung Galaxy S10 Plus passing the bend test, meaning that the phone is durable enough to withhold bends. The other major focus area is the ultrasonic fingerprint sensor. After removing the pre-installed screen protector, he puts a lot of usual scratches on the part of the display that has the reader, and confirms that the sensor works. These scratches are way more than those people typically incur during real life usage. Watch the video below.
In the next step, he puts in deep scratches which simulate the cracks in a screen. After inflicting deep cuts, he finds that the sensor does not respond to the fingerprint and fails to work. This essentially means that if a user breaks the glass of the phone, he won’t be able to use the under-display sensor on the Galaxy S10 or the Galaxy S10 Plus. Nelson also shows a small clip comparing the optical fingerprint sensor testing video shot by YouTuber Marques Brownlee, popularly known as MKBHD.
Brownlee has also uploaded a video showing the cases where the ultrasonic sensor will and will not work. In his test, he showed that the sensor will work perfectly if a user’s thumb is wet. Those using a regular screen protector will also be able to unlock the phone easily. However, those users who go for a glass screen protector, widely known as tempered glass, will not be able to use the ultrasonic sensor rendering the technology useless for them. You can watch the video below.
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