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What is the selling point of smartphones in the third quarter of 2018? Screen fingerprinting technology. Aug 13, 2018

Screen fingerprinting first appeared on the big screen when the 2009 disaster sci-fi movie "2012". When the retreat command issued the retreat command, the Russian tycoon took out his mobile phone and pressed the fingerprint on the mobile phone to display the successful landing.

When everyone feels that all this is like a dream, sci-fi is so extreme, who can think of the technology has been completely mass-produced in less than ten years.

At present, the screen fingerprint technology mainly has the following two solutions: an ultrasonic fingerprint recognition solution and an optical fingerprint solution.

The manufacturers that develop ultrasonic fingerprint identification solutions mainly have Qualcomm. The principle of ultrasonic fingerprint recognition is mainly to use the ability of ultrasonic waves to penetrate materials, and to generate echoes of different sizes depending on the material (the degree of absorption, penetration and reflection is different when the ultrasonic waves reach the surface of different materials), so the skin is utilized. Different from the difference of the sound impedance of the air, it is possible to distinguish the position of the fingerprint 峪 and the ,, to draw a fingerprint image, and to match the fingerprint information. At present, the program has no production models for reference.

The main research manufacturers of optical fingerprinting solutions are Huiding Technology and Xinsi Technology. The principle of the optical fingerprint identification solution is that when the finger touches the surface layer of the screen, the fingerprint recognition chip emits an RGB light beam, illuminates the finger texture through the OLED screen, and then feeds back to the recognition module, and finally forms a fingerprint image for identification. This program is the main application program for mass production and commercialization.

Screen fingerprint recognition mobile phone development

The pioneer of screen fingerprinting - vivo

Vivo is at the top of the screen fingerprints. In 2018, when vivo first exhibited its screen fingerprint mobile phone at the CES, the vivo X20 Plus UD, it has already announced that 2018 will officially become the first year of screen fingerprint recognition. As the first manufacturer to mass produce screen fingerprint recognition technology, vivo has stood at a high point in technology.

At present, the screen fingerprint recognition technology of vivo has been developed to the third generation. After x20 Plus UD, X21 Plus screen fingerprint version to today's vivo flagship of vivo - vivo NEX S, vivo NEX S uses zero-sensing full screen and third-generation screen fingerprint Technology has come to the forefront.

Follower of screen fingerprints - Huawei

Huawei, one of the leaders in the domestic mobile phone industry, certainly cannot ignore the technology of screen fingerprint recognition. Huawei's Mate RS is the first to be equipped with screen fingerprint recognition technology. It uses the same solution as the top technology of vivo, and uses optical fingerprint recognition to become Huawei's first mobile phone with screen fingerprint recognition.

The first pressure-sensitive screen fingerprint recognition mobile phone - Xiaomi 8 transparent exploration version

The screen fingerprinting of the Xiaomi 8 transparent exploration version is different from that of the other two manufacturers. It is the world's first pressure-sensitive screen fingerprint recognition mobile phone with built-in high-sensitivity pressure sensor to enhance the unlock recognition rate and give finger vibration feedback to enhance the unlocking experience.

Updated technology - Meizu 16th series

As Meizu's annual flagship, as a craftsman's Meizu, there is no compromise in design. In Meizu's annual flagship Meizu 16th series, Meizu actively responded to the needs of consumers and added screen fingerprint recognition to its annual flagship.

And other mobile phone manufacturers to distinguish between high and low with screen fingerprints, as a craftsman's Meizu for the user's experience, Meizu 16th uses an optical fingerprint sensor, giving everyone no difference in love.

Meizu realizes this technology, mainly hiding the fingerprint recognition sensor at the bottom of the screen. Unlike ordinary capacitive sensors, Meizu 16th series draws fingerprint images by sensing different reflections of light on the surface of the finger to achieve fingerprint recognition. the goal of.

To achieve this technology, the 16th and 16th Plus use Samsung's custom AMOLED display. The OLED display is a separate pixel on the substrate. The gap between the pixels facilitates fingerprint recognition. The light emitted by the display hits the finger in the recognition area, and then is reflected back to the fingerprint recognition sensor through the gap between the pixels of the screen. The sensor recognizes the different reflection of the fingerprint grease and the fingerprint on the screen by a special algorithm, and draws out Fingerprint image for identification.

As the light passes through the flesh, red light is reflected twice back to the screen, creating signal interference. Therefore, the display must emit blue and green light (color number 00FFFF), and a filter should be installed at the bottom of the screen to filter red light to avoid signal interference.

At the same time, the diamond pixel arrangement of the AMOLED screen is different from the fingerprint recognition sensor pixel arrangement, which causes the pattern formed by the light projection on the sensor to have a moiré effect recognition. Through countless experiments, Meizu rotated the fingerprint recognition sensor angle by 13.7° to eliminate moiré by misalignment. Therefore, the internal component stack of the mobile phone needs to be redesigned. This is an extremely complex and advanced technology, and the final presentation is in front of you is a very simple and intuitive operation, you can simply unlock your finger by placing your finger on the screen, the recognition speed is up to 0.25s. The recognition rate reached 99.12%, and the physical fingerprint was not lost at all.