Liu Haiping of iPhone is mainly an infrared camera, followed by floodlight sensor, distance sensor, ambient light sensor, speaker, microphone, camera and dot matrix projector, each of which is an essential core function of the whole mobile phone.
Although Apple had a patent to protect the 3d sensor from the screen, it can greatly reduce the size of bangs and even cancel the design directly. But at present, it seems that Apple will not use this new technology in the iPhone 13 series.