This seems like a pretty damn good idea, doesn't it?
According to the patent, the entire display can be used as the fingerprint sensor for authentication, using a biometric scanner built into the display layer itself. This has a number of advantages, such as not needing to touch a specific point on the screen such as in optical under-screen fingerprint scanners while being faster than ultrasound in-display fingerprint scanners. For use banking apps where accidental touches need to be avoided, the application can show a specific window for authentication.
