Why is fingerprint recognition the future of mobile phones?
Dec. 23, 2018 | 13:23:00
Nowadays, the global smart phone market is on the status of saturated and the time of change phones is longer. Many mobile phone manufacturers are hope to use the innovative technology to drive the current buying. Fingerprint recognition is definitely the highlight of smart phones in 2019.
According to the latest report of TrendForce, after the launch of Vivo, Huawei, Xiaomi and OPPO, Samsung also will launch a model equipped with fingerprint identification scheme under the screen. It is estimated that the 2019 ultrasound and optical screen fingerprinting technology will account for the mobile phone fingerprint identification market, which will increase from 3% in 2018 to 13%.
At present, the current fingerprint identification app market can be divided into three systems, traditional on-screen capacitive fingerprint identification, on-screen ultrasonic fingerprint recognition, and on-screen optical fingerprint recognition.
Traditional on-screen capacitive fingerprinting is familiar to many consumers. At present, in addition to fingerprint recognition under the screen, other types of commercial fingerprint identification technologies utilize capacitive fingerprint identification technology. As far as technology is concerned, the cost is lower, but the desire to transfer capacitive fingerprint recognition to the screen is indeed no small difficulty, especially the weaker penetration is its limitation.
Traditional capacitive fingerprint recognition is transferred to the screen. The most important solution is to replace the traditional silicon-based fingerprint sensor with a transparent glass-based sensor and directly embedded in the LCD panel to reduce the need to wear The thickness of the LCD panel improves the problem of poor penetration. When the finger touches the screen, the fingerprint sensor can sense the signal and complete the fingerprint recognition.
Although the fingerprint is recognized under the traditional capacitive screen, the screen does not need to emit light during the process. It can support LCD screens, which makes the application cost relatively low. However, because the smart phone screen has a touch panel, the touch panel signal and the fingerprint identification signal may interfere with each other. This problem still needs to be solved.
A few days ago, Qualcomm, the mobile processor manufacturer, presented its first wafer supporting the under-screen ultrasonic fingerprint recognition system at the annual conference. It can be said that it kicked off the century of ultrasonic fingerprint recognition under the screen. South Korea's Samsung's high-end smart phone will be launched this GIS-KY industry, with Qualcomm chip under-screen fingerprint identification system, it is estimated that other mobile phone brands will also be deployed to high-end mobile phones.
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For the moment, the ultrasonic fingerprinting technology under the screen is the most advanced technology. The identification process is to transmit a supersonic wave to the surface of the finger through the sensor when the finger touches the screen of the smart phone, and construct a 3D image by using the difference between the skin of the fingerprint surface and the density of the air. After the sensor receives the ultrasonic echo message, the information is compared with the information stored in the mobile phone to achieve the purpose of fingerprint recognition.
Due to the advantages of ultrasonic fingerprint recognition under the screen, it has strong penetrability and high anti-fouling ability. Even if wet fingers and dirty fingers use smart phones, they can be perfectly recognized. Thanks to the excellent penetration of ultrasound, it also supports other living tests. Through the on-screen ultrasonic fingerprint recognition, 3D fingerprint recognition images can be obtained, and the security is higher than other fingerprint recognition technologies. However, due to technical complexity, cost is also the highest in the fingerprint identification solution under the screen. In the future, perhaps through mass production promotion, the number of growth can reduce the low cost.
Optical fingerprinting under the screen is the most common solution for everyone. Not only smart phone applications, including building fingerprint identification systems, corporate attendance fingerprint identification systems, etc., are optical fingerprinting. The main principle relies on the sensor to project light, and then obtains the light reflection to draw a fingerprint pattern, which is compared with the system memory fingerprint image to achieve the identification function.
However, the under-screen optical fingerprint recognition system used by smart phones is limited by the size of the mobile phone, and can only abandon the general optical illumination system, and the light of the mobile phone screen is used as the light source. At the same time, the LCD screen itself cannot be illuminated, so the products that support optical fingerprinting under the screen are all OLED screens. The smart phone of the OLED screen has a natural interval between the pixels to ensure light transmission. When the user's finger touches the screen, the OLED screen emits light to illuminate the finger area, and the reflected light passes through the screen pixel gap, returns to the sensor under the screen, and the formed image is compared with the data stored in the database.
The advantage of optical fingerprinting under the screen is that it can avoid ambient light interference to the greatest extent, and even better stability in extreme environments. However, optical fingerprint recognition under the screen also faces the problem of dry finger recognition rate. In addition, due to the illumination of a specific area of ??the screen, it is inevitable that some parts of the screen will be susceptible to aging, and the power consumption of optical fingerprint recognition under the screen is much higher than that of the conventional optical fingerprint, which needs to be solved.
Sometimes it's better to use fingerprint password, when you in the bus and someone next to you will look at unconsciously.