Everyone has fingerprints. Fingerprint recognition is something to do every day, unlock mobile phones, fingerprint payment, and even some friends have to rely on fingerprints to check in to work every day, so how does the fingerprint recognition that we use every day work? What about?
Our fingerprints are unique at least for now. There is a saying in the scientific community that the probability of a person with the same fingerprint is one in a billion. This probability is almost negligible (if you encounter a person with the same fingerprint, this Kind of fate, just get married soon!!!). So as long as you have identified your fingerprint, you will verify your identity. For example, when we use a mobile phone with fingerprint recognition or a punch card machine for the first time, we must first enter the fingerprint. When we enter the fingerprint, our device will first check our fingerprint. Recognition records. At present, there are three kinds of fingerprint recognition technologies
The first is the optical fingerprint recognition used by card punching machines and some mobile phones that support fingerprint recognition schemes. Light is irradiated to our fingerprints, because our fingerprints are uneven and reflected to the receiver through light. Above, we can get the pattern of our fingerprint, and its working principle is a bit like the working principle of submarine sonar underwater. Our current fingerprint recognition solutions under the screen of mobile phones are all based on OLED screens. The fingerprint recognition module that receives reflected light is placed under the OLED screen. The light from the pixels of the screen is irradiated and reflected on the fingerprint recognition module. Recognize our fingerprints.
The second type is the capacitive fingerprint recognition that most of us now use every day. The capacitive fingerprint recognition has a capacitive plate underneath. Because our finger fingerprints are uneven, we perform fingerprint recognition. At that time, the raised fingerprint pattern and the recessed place, because the distance from the electrode plate is different, the capacitance of each capacitor plate will be different. The place with large capacitance is the convex pattern, and the capacitance is small. The place is the sunken enemy, and the fingerprint pattern can be identified by the size of the capacitor.
The third type is the ultrasonic fingerprint recognition currently used in some mobile phones. This is similar to the sonar system of the bat that we are familiar with. It emits ultrasonic waves, and then receives the reflected sound waves to recognize our fingerprints, which is basically a An extremely reduced version of the sonar system of a ship's submarine.
Then when the fingerprint recognition program on the door recognizes our fingerprints, we get a rough fingerprint, but the fingerprint lines may not be easy to recognize, so corresponding processing must be carried out to make the lines easier to identify, and the processing is completed After that, the fingerprint recognition system will start looking for some feature points on our fingerprints, such as the beginning of some lines, where the lines are branched, or a section of lines as the identification feature points. At this time, the fingerprint recognition system has completed the fingerprint entry , When we perform fingerprint identification operations later, we will repeat the previous steps. After the fingerprint identification system recognizes the fingerprint feature points again, it will be compared with the fingerprint feature points we entered for the first time, as long as it can Most of the fingerprint feature points entered for the first time can pass fingerprint verification.
The current fingerprint recognition has its own advantages. The capacitive type has an irresistible cost advantage, while the optical and ultrasonic recognition schemes are not completely satisfactory in terms of the maturity of the technology. The use of various indicators on the full screen is still not satisfactory. It can't fully reach the excellent level, but in the future era of smart phones and consumer electronic products pursuing technology and beauty, I believe that better and more mature ones can bring us more surprises.
Guangzhou Winson Information Technology Co., Ltd. , https://www.winsonintelligent.com