Fingerprint recognition unlocking has become the default solution for most smartphones. From a technical point of view, fingerprint recognition currently has several solutions such as capacitance, optics and ultrasound. Starting from the iPhone 5S, the capacitive fingerprinting solution has become the mainstream. At present, fingerprint recognition of almost all mobile phones is a capacitive solution. The working principle is to use the home button of the mobile phone or the capacitive sensor on the back of the fuselage to collect the fingerprint information of the user's hand. A live sensor function can be realized by adding a thermal sensor to the capacitor solution.
Small in size, low in cost and quick to unlock, the capacitor solution has become the preferred unlocking method for smartphones. However, since Samsung's Galaxy S8 has begun to popularize the concept of "full screen", the front-capacitor fingerprint identification scheme has encountered problems: it is difficult to place a capacitive fingerprint sensor under the screen to identify the user's fingerprint.
Capacitor solutions are smashed, and many companies can only focus on other more penetrating solutions, such as ultrasound and optical solutions. The optical solution refers to the provision of an optical sensor at the bottom of the screen to identify the user's fingerprint pattern by emitting near-infrared light, which is similar to Apple's structured light scheme. The ultrasonic solution, as the name suggests, is to set up an ultrasonic sensor at the bottom of the screen to complete fingerprint recognition through ultrasound.
In the mobile phone industry, both solutions have followers. At the MWC conference in February this year, Shenzhen's Huiding Technology demonstrated machines such as the Samsung S7 Edge equipped with an optical fingerprinting solution, but this solution is not yet energy-efficient.
In addition to the screen fingerprinting scheme, many leading companies in the industry have begun to develop a 3D facial recognition solution similar to the Face ID of iPhone X. Qualcomm and Himax, Orbbec, and ManTIs Vision are all experimenting with 3D recognition technology. Guo Mingchi, a KGI analyst in Taiwan, predicts that Android shipments with 3D recognition technology will be 2 to 3 times faster than those using screen-printed fingerprint phones in the next two years. One important reason is that the screen fingerprint must be equipped with an OLED screen, while 3D technology is Can be equipped with OLED or LCD screens. However, Guo also revealed that it takes two and a half years for Android phones to re-enact the face recognition level of iPhone X.
The practitioner of the ultrasound program is the Qualcomm company that is currently on the cusp. According to data provided by Qualcomm, its developed ultrasonic screen fingerprinting technology can penetrate 1200 micron thick OLED screen, 800 micron glass and 650 micron aluminum alloy. At the end of June this year, vivo company showed a prototype equipped with Qualcomm's ultrasonic fingerprinting solution, but the live experience was not satisfactory. According to Qualcomm, the ultrasound solution still has problems of large size, low recognition rate and low recognition speed.
What is the fingerprint recognition under the screen? Fingerprint recognition technology is currently the most mainstream biometric identification method, and its application popularity far exceeds other identification methods, such as iris recognition, vein recognition, and face recognition. With the further development of industrial design, the requirements for technology are getting higher and higher, and the traditional fingerprint unlocking technology cannot meet the more demanding process level requirements. This is also one of the reasons for the birth of fingerprints under the screen. VIVO, OPPO and other mobile phone brands are perfecting this technology, and it can be used in fingerprint locks in the future.
Due to the popularity of the full screen concept, traditional fingerprint unlocking, whether it is unlocked by frontal scratching or pressing, or unlocked by the back, will affect the appearance of smart devices such as mobile phones. Fingerprint recognition requires a fingerprint collection window, which will inevitably affect the screen ratio, so the fingerprint under the screen will come into being.
The screen fingerprint recognition technology is also called invisible fingerprint technology. It is a new technology to complete the fingerprint recognition and unlocking process through the underside of the screen glass. It mainly uses ultrasonic, optical and other penetrating technologies to penetrate various materials to achieve the purpose of fingerprint recognition.
The so-called under-screen fingerprint refers to the recognition technology completed below the screen, without the finger touching the fingerprint module.
The technology is most optimistic is the ultrasonic fingerprint identification means, which can realize the fingerprint unlocking of the screen in the true sense, unlock directly on the screen, do not need the back fingerprint sensing notch, and do not need the front fingerprint sensing device, even under water. The fingerprint unlocking process can be implemented.
The IPhone new machine that was previously passed on will be equipped with the screen fingerprint technology. With the release of IPhone8 and IPhoneX, it has been confirmed that it has not been adopted, but the face recognition technology is adopted.
Detailed description of the features of the fingerprint recognition technology under the screenCompared with traditional fingerprint recognition, the fingerprint recognition under the screen is obvious, and it is also a major development direction of fingerprint recognition in the future.
1. Fingerprint recognition under the screen can greatly increase the screen ratio . The current comprehensive screens for mobile phones, fingerprint locks and other devices are designed to account for more than 80% of the screens. In fact, very few mobile phones meet the requirements. Even if it is 80% of the screen ratio, it is only a relatively comprehensive screen. Fingerprint recognition still occupies a part of the area. Of course, back recognition is a more compromise solution, but the operation is more anti-human. Affected the integrated design, the operating experience is not good, does not meet the requirements of future industrial design.
Therefore, the fingerprint recognition under the screen can further increase the screen ratio and promote the universal popularity of the full screen.
2. The operation is more sanitary , and the fingerprint recognition under the screen does not need to touch the fingerprint module, so no fingerprint marks are left, and no oil remains. It can greatly reduce the impact of finger dirt, grease and sweat on unlocking, and make fingerprint unlocking more sanitary.
A more hygienic operation is also a major feature of the screen fingerprint technology.
3. The identification is more stable and adapts to different usage environments. Traditional fingerprint recognition, due to oil pollution, dirt, obstructions and extreme environment, fingerprint recognition process is biased, easy to identify failure, and screen fingerprint recognition is expected to solve this problem, through penetration recognition technology, even under water The recognition process can also be completed and can be used normally in multiple usage scenarios.
The screen fingerprint recognition technology is more stable and efficient, and the recognition scene is more extensive.
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