Increase knowledge! Samsung Semiconductor talks about the principle of fingerprint recognition

Zhongguancun online message: Our current mobile phones basically use fingerprint recognition, but do you know how fingerprint recognition works? Let's take a look at what Samsung Semiconductor officially says.

Samsung Semiconductor officially said that entering a digital password or hand-drawn drawing, such a complex unlocking method is slowly becoming a thing of the past. With the development of the times, we have gradually become accustomed to a variety of biometric technologies that combine convenience and security. Fingerprint recognition is one of the most commonly used biometric technologies. In general, it can be divided into optical type, capacitive type and ultrasonic type.

Optical fingerprint recognition is a method of comparing a fingerprint image reflected by light with a stored fingerprint. Although durable, it has the disadvantages of low recognition rate and weak security.

The capacitive fingerprint recognition developed later is the improvement of optical fingerprint recognition. When the finger is placed on a capacitive sensor, it can identify the electrical signal difference caused by the bumpy part of the fingerprint pattern. Since it is fast and small in size, it is mainly used in laptops and smartphones.

Ultrasonic fingerprint recognition technology measures the fingerprint height difference by calculating the time returned after ultrasonic emission. It can penetrate objects, and even if there is water or stains on the screen, the recognition rate is quite good. The Samsung Galaxy S21 series of mobile phones released last year uses ultrasonic fingerprint recognition technology.

With the continuous advancement of science and technology, more advanced biometric technologies such as vein recognition, iris recognition, bone and muscle recognition have slowly entered people's field of vision, and all have excellent accuracy and safety, showing the application potential of future technologies.

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