As we all know, 3D structured light face recognition requires the distance between the receiving/sending sensors to be as large as possible to improve the recognition performance, resulting in the “big bangs” on the iPhone screen all the time, and Huawei models using 3D face recognition also have “pills” Digging holes” has become the biggest obstacle in their pursuit of screen-to-body ratio.
On May 8, Optical Vision Technology and screen supplier Visionox officially released a flexible OLED under-screen 3D face recognition solution. The full-screen 3D solution on Android phones enables models that use 3D structured light face unlocking to achieve a true full screen.
Last year, Guangjian Technology also jointly released the first off-screen 3D structured light technology with ZTE mobile phones. This time, the cooperation with Visionox released a 3D structured light solution based on flexible OLED, using the chip developed by Guangjian Technology. With the depth algorithm, the combination of dot matrix and floodlight is completed, eliminating the influence of screen diffraction, and the face unlock can be used without light environment at night, and the photo effect can be enhanced.
Apple’s 3D structured light solution uses a VCSEL laser transmitter to emit light, “diffraction” through a diffractive optical device (DOE), and “slicing” the light to achieve the function of projecting laser speckles. Optics Technology claims that it has realized the world’s only 3D structured light solution that does not rely on Apple’s VCSEL, and has a global patent layout.
Optical Mirror Technology uses edge-emitting laser (EEL) as the light source. Therefore, only one EEL edge light emitting laser is needed as a laser transmitter to realize the overall conversion efficiency from electricity to light to shorten the pulse, and to increase the current and increase the light intensity to compensate for the “transmittance” caused by energy loss while reducing the cost of the speckle transmitter.
3D structured light face recognition was brought up by the iPhone X in 2017, and Apple has been using it to this day. Xiaomi, Huawei, OPPO and other manufacturers have followed up. Huawei has always insisted on 3D structured light face unlocking on Liu Haiping and dual-hole screens, while Xiaomi has only used it in the Xiaomi Mi 8 generation.
Although the internal space of the 3D structured light solution is higher than that of fingerprints under the screen, and wearing a mask will affect the recognition, its security is higher than that of fingerprints under the optical screen, and it is more insensitive. However, the important reasons why the Android camp has not followed up are Apple’s patent obstacles, and the Android camp has moved towards an off-screen fingerprint solution in 2018. In addition, in recent years, Qualcomm’s ultrasonic fingerprints under the screen have become more and more mature, and the security is several orders of magnitude higher than that of optical fingerprints, and can realize large area and wet hand recognition. However, due to various factors, only a few brands such as Samsung, Meizu, vivo, and Sharp are using it.
Previously, ZTE (Axon30), Xiaomi (MIX4), and Samsung (Galaxy Z Fold3) have already mass-produced mobile phones with under-screen front cameras. Except for the solutions used by Samsung, ZTE and Xiaomi, they can be close to normal screens in most angles. However, because the transmittance is inversely proportional to the pixel density of the screen, the under-screen solution always limits the fineness of the screen.
However, in terms of 3D structured light face unlocking, the required resolution is not as high as that of taking pictures, and its fineness to the screen may be relatively small. In addition, similar technology is now the only foreseeable technology that will allow the iPhone to finally get rid of bangs.
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