The front 3D face recognition module costs $30 and the off-screen fingerprint module costs $8. Front 3D face recognition must break the full screen, and the off screen fingerprint conflicts with the full screen. For the above two reasons, the popular 3D face recognition was quickly abandoned by mobile phone manufacturers. From the flagship models released by Samsung, Huawei, glory, oppo, vivo and Xiaomi this year, face recognition unlocking will not be directly abandoned or quietly turned into 2D faces. On the contrary, off screen fingerprint + full screen has become the trend and standard configuration of the mobile phone market this year.

In fact, as the sales volume of China’s mobile phone market continues to bottom month by month, this year’s mobile phone market has suddenly entered a competitive era of “high configuration and low price”. On the one hand, mobile phone manufacturers should make their flagship products have more new functions, on the other hand, they should emphasize the beauty of the comprehensive screen of mobile phones. Although 3D face recognition seems to have a higher security level, it is still ruthlessly abandoned by the market under the current market situation.

The first mobile phone industry research institute learned from the mobile phone supply chain that none of the flagship mobile phones under development seems to use 3D structured light. This also means that since Apple’s 3D face recognition technology has not formed a market trend, combined with the pressure touch technology that Apple has been advocating before, Apple’s leadership in trend technology has not returned to existence.

Off screen fingerprint touch and comprehensive screen will become the standard configuration of mobile phones in the future

On the contrary, in recent years, the multi camera, off screen fingerprint, lifting camera, ceramic body, periscope camera and so on brought by Huawei, oppo, vivo and Xiaomi have completely dominated the trend direction of mobile phone technology. Recently, the constantly exposed design drawings of Apple’s new generation iPhone can be seen that Apple’s mobile phone technological innovation has been following the pace of Chinese manufacturers, and the market retrogression is natural.

So is there more room for the development of 3D structured light and TOF time-of-flight method on mobile phones? Because 3D structured light projects light with certain structural characteristics onto the subject through a near-infrared laser, and then collected by a special infrared camera. 3D structured light scheme has low power consumption and high precision, and has application advantages for close face recognition. However, the technical characteristics are mainly reflected in the advantages of face recognition, but there are no more application scenarios. Coupled with the substitution of off screen fingerprint, it is a foregone conclusion that 3D structured light technology is abandoned by mobile phones.

The working principle of TOF time-of-flight method is different. It calculates the depth through the phase difference of the reflected light received by the TOF chip. It only needs to ensure the correct phase reception, lower requirements for assembly accuracy, easier production and will not be limited by production capacity.

The most important thing is that TOF has lower requirements for the size and area of the measured object, high ranging accuracy, long ranging and fast response. Compared with 3D structured light, TOF technology emits not speckle, but area light source. Therefore, the light information of TOF will not be greatly attenuated within a certain distance. Its advantage is that it has a longer working distance and is suitable for the rear lens of mobile phone.

Compared with two-dimensional images, TOF can obtain richer positional relationships between objects by calculating distance information, and distinguish foreground and background. After further processing, it can be applied to 3D modeling, AR games, AR applications, somatosensory games, online ar shopping and trial wearing. For example, Huawei P30 Pro adopts post TOF to realize more applications through 3D modeling.

The first mobile phone industry research institute learned from the mobile phone supply chain that mobile phone manufacturers, including oppo, also have new models using TOF, which are mainly used in functional scenarios such as e-commerce and games. However, industry technical experts also said that all TOF application scenarios on mobile phones are in the period of design and market cultivation. It is still unknown whether they can really resonate with mobile phone consumers. This also directly determines the enthusiasm of mobile phone manufacturers to participate in the future.

According to the data released by the camera module manufacturer Qiuti technology, the sales volume of TOF modules of Qiuti technology has been increasing in recent months, which is directly related to Huawei’s increased procurement in the first half of the year.

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