Why can't fingerprints be used on the privacy film?

Reason: The anti-privacy film affects the transmission of light and has a certain reflection, causing abnormal sensor data and causing the light-sensitive fingerprint unlocking to not work properly. Screen fingerprint phones all use optical recognition. The fingerprint under the optical screen is actually recognized by the light reflected from the screen by the finger. The anti-privacy film not only weakens the screen light, but also reduces the light reflected by the finger onto the module.

The operating environment of this tutorial: HarmonyOS 2 system, HUAWEI P30 Pro mobile phone.

Anti-privacy film is one of the most popular mobile phone films now, which can protect your privacy. In public places, no one can see what you are doing with your phone, not even your friends, even when you are playing with your phone! The privacy film is so useful, but it is not very compatible with fingerprint recognition. The privacy film will cause the under-screen fingerprint recognition of some mobile phones to malfunction.

Why can’t the privacy film use fingerprints

The privacy film adopts the world’s unique ultra-fine blind optical patented technology to make the screen display The information is designed for users to read from the front. Anyone watching from the sides can only see a dark screen.

The anti-privacy film affects the transmission of light and has a certain degree of reflection, causing abnormal sensor data and causing the light-sensitive fingerprint unlocking to fail to work properly. Screen fingerprint phones all use optical recognition.

The fingerprint under the optical screen is actually recognized by the light reflected from the screen by the finger. The anti-privacy film not only weakens the screen light, but also reduces the light reflected by the finger onto the module.

Using the principle of light transmittance

The principle of anti-peep mobile phone film is achieved by using light transmittance and light refraction, the same as dark glass.

Affects light propagation

Affects light propagation, and has a certain reflection, causing abnormal sensor data.

Using optical recognition

As a result, light-sensitive fingerprint unlocking cannot be used normally. Screen fingerprint phones all use optical recognition.

Straight line transmission

The anti-peeping film allows light to travel in a straight line and blocks the transmission of light, unless it is customized.

Expand knowledge: Uses of privacy film

Mostly used on laptops. It is a semi-rigid film of plastic material covering the screen, about 1mm-2mm thick. The main function is to lower the display angle of the screen. Simply put, people around you will not be able to see the content of your screen clearly. This is where the name of privacy protection comes from. Mainly used for business notebooks. Since this type of notebook is used for work, using this can prevent someone from snooping on your secrets. Generally, many commercial notebooks will have this option. Since home notebooks are mainly used for entertainment, and manufacturers strive to expand the display range to enhance the sharing of screen content by multiple people, they generally do not have this option.

The existing privacy film products are composed of the original anti-reflective film, anti-UV film, mirror film, and anti-radiation film, and then add the new function of privacy film.

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