Fingerprint sensors have recently become really common in smartphones even in entry-level smartphones where the sensors are not only used for unlocking the device but also for making payments and a few other tasks. Earlier these sensors were present on the power button but now the companies have started using in-display fingerprint sensors. There are three types of sensors- Ultrasonic, Optical, and Capacitive. In this article, we are going to talk about the difference between Ultrasonic and Optical fingerprint sensors.
Ultrasonic vs Optical Fingerprint sensors
Ultrasonic sensor uses high-frequency sound waves to create a 3D image of the user’s fingerprint while Optical sensor captures an image of the fingerprint which is stored as a 2D digital image, which is then compared to the stored fingerprint data to authenticate the user. The ultrasonic fingerprint sensor is the latest biometric authentication technology and is said to provide better accuracy and security than the 2D optical fingerprint sensor.
Optical fingerprint sensors are relatively inexpensive compared to Ultrasonic fingerprint sensors. Optical sensors work well with screen protectors and cases but ultrasonic sensors may not work with protectors or cases that are too thick
Optical fingerprint sensors can be easily spoofed with fake fingerprints while they may also not work well if the user’s fingers are wet or dirty. Meanwhile, ultrasonic sensors are more difficult to spoof as they create a 3D image of the fingerprint. Also due to 3D scanning, ultrasonic sensors can be used even if your fingertip is wet or oily at times. However, the sensor is frustrating to use if there is oil or dirt on the print or the glass is dirty.
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