Why do patents involve professional technical fields such as human-computer interaction 3d display?

In order to improve privacy and confidentiality. The professional technical field involved in the patent requires high confidentiality, and the traditional man-machine interaction mode can also allow non-operators to peek at the operation information with low confidentiality, while the 3d display has a large peep prevention angle and a large disorder of images, which can ensure the privacy of the display of the man-machine interaction system.