The first feeling is high technology, and the second feeling is mystery: 1. High brightness and high energy. Military-grade ultra-high energy, difficult to control, laser weapons; civilian level is very weak, easier to control, laser pen and mouse have applications. 2, directionality, that is, clustering, which is one of the important differences between laser and other light sources. In the field of display, ordinary light sources can be easily fabricated into light sources, and lasers are difficult.