The DIY biometric lock is also equipped with three push buttons and a 16×2 LCD display. “This is a security door lock with fingerprint sensor.

Redmi, a Xiaomi spin-off phone brand, says it has made in-display fingerprint sensors that work with LCD screens. Previously, only OLED screens supported them.

The Chinese company's solution, called Vivo Under Display, is a fingerprint sensor that can be placed under glass, an OLED screen, or even aluminum (!), making it completely invisible and unobtrusive.

Cellphones with built-in fingerprint scanners aren't exactly revolutionary, but a recent patent application filed by Nokia could foreshadow mobile displays that recognize and react to biometric ...