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vivoX20PlusUD evaluation: full screen swept the entire smart phone market in 2017, the use of rear fingerprinting is a last resort compromise, in addition to Apple 's ten-year grinding sword developed Face ID, the industry's face recognition programs, and improve Security sacrifices the speed of unlocking iris recognition, there is no one for the full screen has a substantial breakthrough in the product. Synopsys and vivo joint launch of the screen under the fingerprint program announcement, all concerned about the full screen of the user's eyes together , Blooming in the 2018CES conference, which also makes the Android team more emboldened to Sword Face ID.

Analysis of Four Fingerprinting Schemes

Since fingerprint recognition technology became popular in 2015, some vendors started to develop fingerprints on the screen until MWC Shanghai 2017. vivo displayed the fingerprint recognition technology jointly developed by Qualcomm. At that time, it was merely a concept machine and Fully illustrates the difficulty of its research and development is not small.

From the principle of fingerprinting, the commonly used fingerprinting methods are divided into four types: optical identification, capacitive identification, thermal identification and ultrasonic identification. The capacitive module with 'lightweight and low cost' is the mainstream solution for most smartphones At present, the peak saturation of the market has also prompted major manufacturers want to use more 'innovative' programs to adapt to the raging storm hit the full screen.

Four common programs, Capacitive sensor The structural principle of the module is relatively simple: First, a radio frequency signal is emitted. The signal is reflected by the fingerprint lines. It shows different capacitance variation characteristics on the same contour. According to different charge numbers, the final image is obtained, To match the charge values ​​reserved by the system, of course, also has the disadvantage that the surface of the capacitive module is usually used semiconductor material, more easily damaged, and through the valley of the fingerprint and ridge at the interval to form a fingerprint image of finger wet Or dirty finger recognition rate will be reduced.Although many years of iteration, the performance of capacitive sensors more mature, but limited by the principle, the life cycle seems to be the end.

Thermal fingerprint sensor In the current market, the use of less frequency, the principle is to collect finger texture and sensor contact part of the temperature difference in order to check fingerprints. Disadvantages Obviously, easily affected by external heat interference, so these sensors are generally used with capacitive fingerprint sensor To detect the function of the living body, to identify fake artificial fingers or no temperature fingerprint, so to cancel the nail punch card, to the idea of ​​the buyer's finger to Taobao, a thermal fingerprint sensor let you feel despair.

Ultrasonic sensor The main developer is Qualcomm, which builds a 3D graphic of a finger's fingerprint shape by ultrasound and then compares it with the data already stored on the terminal. The advantage is that it has a strong penetrability and is stained with water stains , Grease, stain fingers can also be unlocked, these are optical fingerprint and capacitive fingerprint unmatched, and under the water does not affect the normal unlocking operation.

Optical sensor The main developers for vivo and Synopsys, mainly for fingerprint recognition under the screen, favored by a wide range of people in the industry, the main factor is the optical solution in principle with a capacitive incomparable breakthrough -Optical evaluation fingerprinting It will emit light when the finger touches the screen, penetrate the cover to the screen surface, and then use the backlight to illuminate the fingerprint, and then reflect back to the fingerprint sensor below the screen.It needs to focus on pressing the finger tightly on the glass to get Effective reflection, suitable for use with OLEDs that have self-luminous properties.

Optical and ultrasonic programs in the end what is strong and weak, there is no clear conclusion, the current technology, the optical slightly better than the ultrasound.

1, low energy consumption , Both schemes need sufficient penetration performance, so the demand for energy consumption is also better. The ultrasonic fingerprint identification on the screen is biased towards active induction, while the optical fingerprint recognition on the screen utilizes the screen's own light source to be more energy consuming Will be low.

2, small size module Because of the high power requirements, this also directly affects the module size. Currently, the technology can not reduce the size to the ideal range, and the miniaturization of the module is very difficult.

3, high yield , Ultrasonic and optical sensors want to do the fingerprint under the screen, you need to attach to the OLED screen, and optical glue easier to paste on the screen, because a slight difference in gel density does not affect the optical effect, while the acoustic effect of the paste The requirements of a higher technology, in the manufacture of optical sensors more advantages.

In June 2017, vivo demonstrated at MWC Shanghai Expo a Xscreen 6 equipped with on-screen fingerprint technology that uses Qualcomm's ultrasonic solution and the Vivo X20Plus released today is an optical solution.

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Three manufacturers for the fingerprint solution under the screen

There are two main ways to unlock optical fingerprint: Under Display and In Display, Under Display, Under Display Fingerprint recognition chip is placed below the display, the two overlap, and In Display fingerprint recognition module is done inside the display .

Currently including Apple, the top technology, Synopsys (Synaptics) and other companies are in the screen under the fingerprint development, respectively, under the difference between the various manufacturers programs:

1, apple

In November 2015, Apple applied for a patent on the screen for fingerprinting on the OLED screen. In February 2017, the company applied for a patent on the optical fingerprinting for the MicroLED screen. This shows that Apple has a solid technical foundation.

This solution replaces larger capacitive sensors with smaller infrared emitters and sensors and installs new sensors on microchips located next to RGB LED display substrates or mounted on a substrate. Of the infrared light reflected by the fingers, and then reflected back to the sense diode. In other words, this year's iPhone X for Apple is only considered a test of water for a good show or look behind.

2, the top science and technology

In the March 2017 MWC release, Optometrics has released an optical fingerprint scheme that illuminates the fingerprint through the light of the AMOLED screen so as to penetrate the gap of the OLED screen through the returned light and reflect it to the CIS under the screen. Finally Then the return light analysis, combined with software processing, fingerprint recognition to achieve the basic process.

This approach is currently facing a problem, that is, the screen brightness is insufficient, or identify the area with other display image interference, there will be a big fingerprint identification deviation, there is a distance from the production of 'precipitation' process.

3, Synopsys (Synaptics)

Vivo and Synopsys jointly launched the details of the fingerprint under the screen is not much, but from the official website of the new idea of ​​certain that the technology should be In Display, and indeed developed for the OLED screen, Synaptics Clear ID features Is that it can be completely encapsulated in the AMOLED display module, press the screen to complete the unlock, the perfect fit for the simple, borderless button-free full screen design, the sensor thickness is only about 1.5mm. ID in dry, cold, hot and other harsh environments, can also be done to identify the precise fingers, support for local TLC / AES / ECC encryption also make it a more solid security protection.

When it comes to Vivo's X20Plus in-vivo fingerprint display on Vivo 2018CES this year, it features the Clear ID FS9500 Optical Fingerprint Sensor introduced at the end of 2017. According to official Synaptics introduction, Clear ID FS9500 is faster than 3D facial recognition About twice, at the same time both compact size and ultra-thin thickness.

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The above is about vivoX20PlusUD product evaluation reports, vivoX20PlusUD appearance, screen, camera, battery life, performance and other follow-up content, please continue to focus on the report on the evaluation of vivoX20PlusUD Zhongguancun online.

vivo and Synopsys cooperation under the screen fingerprint experience?

As the saying goes, 'do not look at ads to see the efficacy of', and then wonderful 'manual' after all, to return to the real user experience.

Fingerprint recognition module 'embedded' screen, the actual experience will be affected? To reach the mainstream of capacitive fingerprint recognition of what the standard, or better?

To the front of the Zhongguancun 2018CES editing experience experience, vivo X20Plus screen fingerprint input frequency significantly more than the mainstream of the capacitor (about 18 times), the input speed compared to ordinary capacitive fingerprint read slower , Of course, input fingerprinting this 'almost one-time' operation, enter slow down acceptable.

Because the fingerprint recognition module is hidden in the glass cover, the naked eye of the user can not observe the specific location of the fingerprint module. Therefore, the location of the fingerprint under the vivo X20Plus sets a mark of blue fingerprint, and gives similar blood vessels Diffusion of dynamic feedback, users only need to weight can be unlocked as long as the attention is that you have to use a little effort, close to press the volume keys.

Can be seen through the animation, after pressing the need to stay for half a second, wait for the 'blood vessels' animation shows the unlock success, although the unlock time is not too long, but compared to the current excellent solution to unlock or small Small gap. Unlock success rate on the performance is very good, 20 times the unlock experience without losing time.

Overall, vivo X20Plus fingerprint under the performance of the 'five-star praise', although the unlock speed still needs to be improved, but it is undeniable that it has a more perfect experience and a higher unlock success rate, I believe innovation The style of unlocking will attract a large number of fans to use.

Need to explain that the light emitted by the OLED screen needs to hit the finger through the glass cover, so the process itself is not difficult, if the cell phone affixed to a layer of film, it is bound to unlock the vivo X20Plus fingerprint under a certain Interference, so before the special unlock film appears, in order to use the normal vivo X20Plus fingerprint unlock the screen, you can only choose not to use the film.

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The above is about vivoX20PlusUD product evaluation reports, vivoX20PlusUD appearance, screen, camera, battery life, performance and other follow-up content, please continue to focus on the report on the evaluation of vivoX20PlusUD Zhongguancun online.

Write the future looking to the end

For now, the screen under the fingerprint in the penetration rate there is still a big challenge, re-production of the module will lead to the entire industry chain re-rectification, supply is a problem. Also let us dare to look forward to the future, imagine the screen What is the next step in innovation after the popularity of the fingerprint?

I think it should be to expand the area under the screen to unlock the fingerprint.For example, since the advent of the hammer mobile phone, has been the rear 'T' logo as a unique symbol, there are users Imagine, logo and fingerprint can not be combined CEO Luo Ronald immediately gave a reply 'difficult, very difficult.' Nut Pro 2 finally released this year, or overcome the storm, using a logo and fingerprint recognition as one of the design.

Looking at the bottom of the screen fingerprints, since the cancellation of the 'limited' fingerprint area, then further expand the area of ​​the screen fingerprinting should be the next step of innovation initiatives, imagine, if a piece of screen, casually press where you can unlock, is not it Novelty yet.

Conjecture is not empty talk, as early as 2017, CrucialTec has filed a patent, its full-screen fingerprint recognition technology (DFS) to identify the user's fingerprint anywhere on the screen, compatible with OLED and LCD screen, but also compatible with optical Fingerprint identification and the current mainstream of capacitive fingerprint identification two programs.

Rumor has it that CrucialTec's full-screen fingerprinting technology is likely to be available on the Samsung Galaxy Note 9 in the second half of 2018, but given the fact that CrucialTec's technical reliability is still unknown, given the fact that no information is available at this time.

All in all, Vivo and the Synopsys X20Plus launched under the screen fingerprint technology, is an innovation in the industry, refresh our previous awareness of the vivo brand, but also proved that this disruptive innovation is not only Only Apple has.

This article belongs to the original article, if reprinted, please indicate the source: fruit X expect it to go to the bang but domestic mobile phone Jiezu first board http://mobile.zol.com.cn/674/6745179.html

The above is about vivoX20PlusUD product evaluation reports, vivoX20PlusUD appearance, screen, camera, battery life, performance and other follow-up content, please continue to focus on the report on the evaluation of vivoX20PlusUD Zhongguancun online.