Undoubtedly, the launch of iPhone X, the first to use 3D-aware face recognition technology, has created a whirlwind in the industry. However, Android-speaking smartphone makers still hold a wait-and-see attitude toward face recognition technology. The main reasons lie in two aspects: On the one hand, Apple’s 3D-aware camera module costs about US$60, which is costly and the iPhone X’s sales are not satisfactory. On the other hand, due to potential patent infringement of 3D-aware technologies developed by mainland suppliers, Risk, if the mainland mobile phone manufacturers fully import the flagship model, it will bring risks and harm to the mobile phone brand.
As the 3D facial recognition technology remains to be seen, coupled with the push of the full screen of 18:9, the smart phone manufacturers of the Android camp increasingly favor fingerprint recognition technology under the screen.
Under the screen fingerprint identification, the core difficulty lies in how to hide under the screen, and through the screen to the user's fingerprint for information acquisition and matching recognition, common capacitive fingerprint recognition technology is difficult to do this. And on the current fingerprint identification technology It is said that only ultrasonic fingerprinting and optical fingerprinting are applicable.
Ultrasound fingerprinting
Ultrasonic fingerprint identification technology is a very new identification solution. Among them, representatives of the company are Qualcomm and FPC. It is understood that Qualcomm's ultrasonic fingerprint identification technology has cooperated with touch-control maker Ophelia Optoelectronics and Industry, though it is compared with traditional fingerprint recognition. The module, ultrasonic fingerprint identification module is about 3 times more than the difference, but its module thickness is about 0.44mm, it can penetrate the protective glass with the thickness up to 800μm and the aluminum plate with the thickness up to 650μm, far better than the capacitive module wears. Transparency (about 200~300μm glass).
At the 2017 MWCS exhibition held in Shanghai last year, Vivo demonstrated to the outside world Qualcomm's second-generation ultrasound fingerprinting solution, which has attracted intense attention.
Compared to capacitive and optical fingerprint recognition, the advantage of ultrasonic fingerprint recognition is that it does not need to open the hole to completely give way to a full screen, which improves the waterproof and dustproof performance of the mobile phone. The dry humidity of the finger is reduced, and the wet hands can also be unlocked. Mobile phone.
However, there are limitations, as can be seen from vivo demonstration of vivo, ultrasound fingerprint unlocking can only be in a fixed small area, whether it can be expanded to full screen unlocking.
Optical fingerprinting
The principle of the optical fingerprint identification technology is to place a finger on an optical lens, use the speed of light to shine on the finger, and then reflect it to the sensor for acquisition and recognition. Representative manufacturers include Synaptics and Huiding Technology. It is reported that Vivi's latest screen fingerprint is released. The vivo X21 mobile phone adopts the screen-down optical fingerprinting program of Huiding Technology, marking the formal scale commercialization of Huiding Technology's optical fingerprinting under the screen.
Huiding’s optical fingerprint technology under the screen is close to the performance of capacitive fingerprinting in terms of unlocking speed and other indicators. It transcends capacitance fingerprinting in terms of penetration thickness, waterproofness, etc. According to Huiding, the optical fingerprint under the screen has been in the past year. On the new industrial chain, Huiding Technology worked closely with its upstream and downstream partners to achieve breakthroughs in a series of production technologies such as processes and testing. With its outstanding product performance and product yield, it has impressed vivo and become its major supplier.
Although the use of optical fingerprint recognition is currently a mature solution, this method is subject to large oil contamination on the surface of the finger and can not be detected by living organisms. Compared to the commonly used capacitive fingerprinting scheme, the theoretical safety is lower. .
It is worth mentioning that, after Vivo launched the mobile phone with fingerprint unlocking technology under the screen, KGI's analyst Guo Minghao pointed out in the latest investment report that Samsung may not use the new generation of products in the Galaxy Note 9 generation. Screen fingerprint technology.
According to Guo Mingyao, there are still many technical difficulties in the under-the-screen fingerprint identification program, such as the screen protection coating and the impact on recognition accuracy in different environments, as well as excessive power consumption. However, Guo Mingyi still has the biometric technology of fingerprint identification under the screen. The future is optimistic. He believes this technology is a must for full-screen handheld devices.
Guo Mingxi said that Samsung’s implementation of an under-the-screen fingerprinting solution added some uncertainty to the final commercial use of the technology. In his view, the fingerprint identification technology under the screen could not be realized until the first half of 2019.