Since Apple's flagship IPhone X was invented, the most eye-catching feature is the cancellation of the home button using face ID facial identification technology, by the new sensor installed on the top of the IPhone x ' Liu Hai ', which is a row of cute ' Zishinghai ' hiding multiple sensors, To make the sensor demand more hot, but also to avoid the pursuit of advanced system Chengmor the law of another road! According to the Shanghai Institute of Micro-technology industry (SITRI) analysis, Apple uses the iphone x 3D Stereo Image sensing technology called Truedepth Camera, the introduction of infrared lenses, floodlight, lattice projector These three new sensor technology, and these new components appear, The goal is to allow iphone x to introduce a 3D face recognition system technology. According to Sitri's solution to Apple's iphone x, the ' Zishinghai ' inside of Apple's iphone x contains sensors in addition to the above three, as well as ambient sensors, distance sensors, 7 million-element front lenses, microphones, speakers, etc., where the distance sensor chip comes from the Italian semiconductor ( Stmicroelectrics) 's distance sensor (ToF) chip, which has been used in Apple IPhone7 plus; Furthermore, the microphone is from a MEMS sensor supplying the Dachang electronics (Knowles). The ambient light sensor (ambient light sensor) is the use of optical bipolar (Photo diode) to detect ambient brightness, the eyes of the user in the sun will be reduced, so that the screen dimming automatically let users easily watch. Sitri further analysis, there is a Vcsel chip in the lattice projector, the infrared light emitted by the Vcsel chip is shot out through the lens above the chip, after two reflection mirrors, and finally through the diffractive optical element (DOE), it forms about 30,000 infrared structure light and calculates the distance between the different positions of the face. Moreover, the mainland mobile phone brand Vivo X20 also has the function of facial recognition, including the front lens, distance sensors, and so on, two distance sensors are from Austria Microelectronics (AMS). Sitri explains that there are three steps to starting an Apple face recognition, and the first is that when an object approaches a cell phone, the tof is first started; The second step is that the start of the sensor will excite the floodlight and infrared lens, and the Vcsel chip of the floodlight will emit infrared light, which is captured by the IR camera to determine whether it is a human face or not. The third step is that, if judged by a human face, will launch the lattice projector, the lattice projector will emit about 30,000 infrared structural light points, and by the infrared lens to capture 3D face, the image of the face of the message to judge, and then through the A11 processor comparison, to obtain the message of face recognition. Although the mainstream semiconductor industry continues to pursue Moore's law-led advanced process technology, the development of 16/14 nm, 10 nm, 7 NM FINFET process technology, but put aside the Moore's Law of the road, in the way beyond the Moore's law, the application of the sensor has been a considerable attention, The future is not but consumer electronic products, including the Internet, automotive electronics, are the main battlefield sensor chip!
