In theory, An ultrasonic fingerprint sensor works by bouncing a sonic pulse wave off of your fingertip to create a three-dimensional image. It's much more secure than optical in-display sensors and will work even if your fingers are greasy, dirty, or wet.
A Galaxy S10 user recently got a Rs.100/- ‘gel screen protector’ off eCommerce site. However, he realized that after using the protector, any fingerprint could unlock the phone. According to Samsung, the case is under investigation. Nevertheless, the company considers this issue to be related to the cost of the screen protector Rs. 100/- .
Samsung earlier had warned Galaxy S10 owners against unofficial screen protectors.
Galaxy S10 series which comes with an ultrasonic fingerprint sensor. While this fingerprint reader is top-notch, it does not work well with a tempered glass screen protectors. Many users can not use a smartphone without a screen protector, so what’s the solution? Accessory makers use a liquid adhesive to create a stronger seal between the protector and display. While this seem to work perfectly for some users, try not to buy a Rs.100/- screen protector.
Samsung’s ultrasonic fingerprint reader works by sending sound waves at the user’s finger and reflected waves are read. However, standard glass protectors create a small gap between the finger and the display. This reduces the effect of the fingerprint sensor. In the era of full-screen devices, ultrasonic on-screen fingerprint sensors are actually a good solution. However, they are by no means perfect. Nevertheless, users will have to come to terms with the fact that only plastic protectors seem to allow ultrasonic fingerprint readers to work without issues.
So even if in theory Ultrasonic fingerprint readers are more accurate than their optical counterparts and more secure because of the 3D impression that the reader creates of your finger, Beware untested technologies can bring in simple security loop holes. Security cannot be measured in price and security is a long standing myth.
