As we all know, 3D structured light face recognition requires that the distance between the receiving and sending sensors be as large as possible to improve the recognition performance, resulting in "big bangs" on the iPhone screen all the time. Huawei models that use 3D face recognition also have "pill digging holes", which is the biggest obstacle in their pursuit of screen share.

On May 8, Optical Technology and screen supplier Vicino officially released the 3D face recognition scheme under the screen of flexible OLED, claiming that this is the world's first comprehensive screen 3D scheme that can be mass produced and adapted to Android phones developed by both parties through in-depth strategic cooperation, so that models that use 3D structured light to unlock faces can also achieve true and comprehensive screen.

Last year, Light Discrimination Technology also jointly released the first 3D structured light technology under the screen with ZTE mobile phones. This time, the cooperation with Vicino is a 3D structured light scheme based on flexible OLED, which uses the chip and depth algorithm developed by Light Discrimination Technology itself to complete the integration of dot matrix and floodlight, eliminate the impact of screen diffraction, and can also be unlocked by face without light at night, And enhance the photographic effect.

Apple's 3D structured light scheme uses a VCSEL laser emitter to emit light, "diffract" it through a diffractive optical element (DOE), and "slice" the light to achieve the function of projecting laser speckle. Light discrimination technology claims that it has realized the only 3D structured light scheme in the world that does not rely on Apple VCSEL, and has a global patent layout.

Optical discrimination technology is based on edge emitting laser (EEL) As the light source, the official saying is "based on the nano photonic chip, a beam of light is divided into tens of thousands of beams of light to achieve the function of projecting laser speckle by modulating the light field at the sub wavelength scale". Therefore, only one EEL side light emitting laser is needed as the laser emitter to achieve the overall conversion efficiency from electricity to light to reduce the pulse, It can increase the light intensity by increasing the current to compensate for the energy loss caused by the "light transmittance", while reducing the cost of the speckle emitter.

3D structured light face recognition was introduced by the iPhone X in 2017, and has been used by Apple ever since. Xiaomi, Huawei, OPPO and other manufacturers have followed up. Huawei has always insisted on 3D structured light face unlocking on Liu Haiping and double hole digging screens, while Xiaomi has only used it in the generation of Xiaomi 8.

Although the 3D structured light scheme has a higher internal space occupation than the fingerprint under the screen, and wearing a mask will affect the identification, its security is higher and more insensitive than the fingerprint under the optical screen. However, the main reason why the Android camp did not follow up was Apple's patent barriers and the fact that the Android camp went to the offline fingerprint scheme in 2018. In addition, in recent years, Qualcomm's fingerprint under the ultrasonic screen has become more mature, with security several orders of magnitude higher than that of optical fingerprint, and can realize super large area and wet hand recognition. But because of various factors, only Samsung, Meizu vivo、 Sharp and a few other brands are in use.

Previously, ZTE (Axon30), Xiaomi (MIX4) and Samsung (Galaxy Z Fold3) had mass produced phones with off screen front cameras. Apart from Samsung, ZTE and Xiaomi have been able to approach the normal screen in most aspects. However, because the light transmittance is inversely proportional to the screen pixel density, the underscreen scheme always limits the screen fineness.

However, in terms of 3D structured light face unlocking, the required resolution is not as high as that of taking pictures, and its screen fineness may be relatively small. In addition, similar technology is also the only technology that can be predicted to make iPhone finally get rid of bangs.

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