Xiaomi Redmi 7A

Redmi created under display fingerprint sensor for LCD display


Xiaomi sub-brand Redmi has successfully implemented the under-display fingerprint sensor in an LCD panel. As of now, the under-display fingerprint sensor only works for OLED panels.

Redmi China, Vice President, and General Manager, Lu Weibing, shared a post on Chinese social networking site Weibo explaining how the technology works. He also shared a video for the same.

“The innovative use of infrared high-transmittance film material greatly improves the transmittance of infrared light that could not pass through the screen,” the post read.

“The infrared transmitter at the bottom of the screen emits infrared light. After the fingerprint is reflected, it penetrates the screen and shines on the fingerprint sensor to complete the fingerprint verification.”

Currently, LCD display smartphones only feature a rear-mounted or side-mounted fingerprint sensor. But with new technology, it seems that cheaper versions of LCD phones will also get the in-display fingerprint sensor.

The company said that it will soon start mass production of new technology so that upcoming smartphones will feature an in-display fingerprint panel.



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