Redmi shows off LCD in-display fingerprint scanner, says it is ready for mass production

Redmi General Manager, Lu Weibing announced that the company has successfully implemented LCD Fingerprint scanning on an LCD screen.

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At present, all LCD screen mobile phones only use physical fingerprint sensor on the back or the side. The Redmi R&D team has now overcome this problem with a new method and in-screen fingerprint on LCD screens is also ready for mass production, said the company.

The working principle of the screen fingerprint is simply to record the characteristics of the fingerprint and feed it back to the sensor below the screen to determine whether it coincides with the fingerprint that had already been registered.

However, because the fingerprint sensor is below the screen, there needs to be a channel to transmit optical or ultrasonic signals, which results in the current implementation only on OLED screens. LCD screens can’t feature this visible unlocking method because of the backlight module.


In the new and innovative method Redmi has used infrared high-transmittance material that greatly improves the transmittance of infrared light. 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, which solves the LCD Fingerprint problem.

The company has also demoed it on a Redmi Note 8 Pro prototype after replacing the screen with the new LCD screen that has an in-display fingerprint scanner. As you can see, the fingerprint recognition looks as fast as an OLED screen, however the fingerprint sensor is present closer to the bottom bezel of the screen. We will have to wait to see how this compares to the in-display fingerprint scanning on an OLED display.


Redmi K30 Pro Likely to Come With LCD Screen and In-Display Scanner

The timing of the announcement coincides with the launch of Redmi Note series in India. Xiaomi has announced the Redmi Note 9 and Redmi Note 9 Pro will be unveiled on March 12. It is speculated that Redmi might just bring this new technology in its Note series.

Also expected to feature this new technology is the global version of the Redmi K30 Pro. The current K30 Pro model available in China comes with LCD display and a side-mounted fingerprint sensor. It is expected to launch globally at the end of this month and we might possibly see the first LCD display fingerprint scanner featured in this phone.

As usual, these are mere speculations at the moment, and there hasn’t been any official confirmation from Redmi as to when we will actually see LCD phones with in-display fingerprint technology.

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