Fingerprint unlocking is not a "black technology". As early as 2013, Apple added Touch ID fingerprint recognition on the iPhone 5S. Subsequently, the Android camp's mobile phone has gradually followed up, making fingerprint recognition a standard for smartphones. However, with the further development of industrial design, the traditional fingerprint unlocking technology can not meet the more demanding process level requirements.
Under-screen fingerprint recognition technology, the term that has been heated up in the past few months, did not appear on the iPhone X, which is known as the front and the back. On the latest iPhone X, Apple used Face ID instead of the original Touch ID for authentication. However, it is rumored that Apple wants to put fingerprints on the screen and never stops. In fact, Apple's on-screen fingerprint recognition has not stopped research and development, but the time period is not enough.
Even the fingerprint recognition of the screen that Apple has not used is difficult.
Fingerprint recognition technology is one of many biometric identification technologies. Available biometric technologies include fingerprints, faces, voice prints, irises, and the like. Fingerprint is one of the most widely used. There are three main types of fingerprint acquisition technologies for smart phones: capacitive, optical, and ultrasonic. Among them, capacitive type still has the highest market share in the field of smart phone applications.
Since our fingerprints are made up of uneven skin lines, the texture of each finger is completely different, so different fingerprint images can be obtained by the sensor. Since the surface roughness of the skin causes the distance between the different positions of the fingerprint to the sensor to be different, the measured capacitance is also different, and finally the fingerprint image is translated into an electrical signal that the chip can understand, so that accurate fingerprint measurement can be realized. However, the capacitive fingerprint sensor also has the disadvantage that it cannot recognize the fingerprint pressed on the screen through the screen of the mobile phone, mainly because the thickness of the screen module itself causes the sensor to collect insufficient useful signals. This makes the front capacitive fingerprinting solution useless on full-screen phones.
The full screen, literally explained, is that the front of the mobile phone is all screens, with a borderless design, the pursuit of close to 100% of the screen. However, due to the current technology, the industry claims that the full-screen mobile phone is only a high-screen mobile phone, and there is no mobile phone that can make 100% of the front screen of the mobile phone. Nowadays, the comprehensive screen mobile phone in the industry refers to a mobile phone with an ultra-narrow bezel design with a real screen ratio of more than 80%. If you want to make the full screen more "comprehensive" or even closer to the real "full screen", the screen fingerprint recognition must be overcome.
The screen fingerprint recognition technology, also called invisible fingerprint technology, is a new technology for completing the fingerprint recognition and unlocking process under 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 identification technology that completes the acquisition through the screen, without the direct contact of the finger with the fingerprint module. Under-screen fingerprint recognition ensures the integrity of the screen, and the finger can be directly attached to the screen to identify and unlock. At the same time, the fingerprint recognition under the screen can also greatly reduce the impact of finger dirt, grease and sweat on unlocking.
Currently, there are two types of under-screen fingerprint recognition schemes: one is realized by OLED, that is, optical fingerprint recognition; the other is ultrasonic fingerprint recognition.
Optical fingerprint recognition is to set up an optical sensor at the bottom of the screen to identify the user's fingerprint pattern by emitting near-infrared light. Ultrasonic fingerprint recognition is to set up an ultrasonic sensor at the bottom of the screen to complete fingerprint recognition through ultrasound.
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