Apple canceled touch ID for both the development of face ID and the fundamental redesign of iPhone to remove the home key from the front of the device. Although Apple reintroduced the touch ID via the power button in the iPad air 4, it has consistently refused to do the same on the iPhone. Now the new patent shows that apple can add touch ID back to the iPhone by using infrared light and penetrating display imaging technology without reintroducing the physical home key to avoid damaging the edge-to-side screen design. < / P > < p > in a patent granted by the U.S. patent and Trademark Office on Tuesday called & quot; short wave infrared optical imaging via electronic device display screen & quot;, apple proposed a method of fingerprint identification using light, while working around display elements. < / P > < p > Apple pointed out that the optical imaging system may be placed near the display screen, but this may make the frame thicker than the designer expected. Instead, Apple’s optical imaging system is located below the main display stack, which typically consists of an external protective layer, a touch sensitive layer, and the display itself. The scheme is that the optical imaging system will emit short wave infrared light upward, and the short wave infrared light will interact with the finger and reflect the light according to the existence of ridge line in contact with the screen. Then, the reflected infrared light will be received by the photosensitive element in the same optical imaging system, and then it can present part of the fingerprint for analysis. < / P > < p > it makes sense to use infrared light because it’s a light that the human eye can’t see at all, so it won’t be distracting or dizzy. In addition, since the display will be used to emit visible light instead of infrared light, and the photosensitive element will be adjusted to detect infrared light, the system will not have false alarms or reading failures due to different light sources. Apple also suggests that there should be an opaque mask between the photosensitive element and the infrared light-emitting element, and that a waveguide be used to leak light through the inter pixel area of the & quot; display, the bit between each pixel. These inter pixel areas will allow infrared light to pass in both directions, enabling the system to work behind the display. < / P > < p > Apple submits a large number of patent applications every week. However, although the existence of patents indicates the areas of interest for Apple’s R & D work, there is no guarantee that these concepts will appear in future products or services. The report shows that the number of app store purchases soared in the first half of this year due to the impact of covid-19