Method and device for solving problem that laser pen cannot project on display screen

The invention provides a method and device for solving the problem that a laser pen cannot project on a display screen, whether a laser point irradiated on the display screen by the laser pen is displayed or not is judged through image recognition, and if not, a light spot simulating the laser point is generated at the corresponding position on the display screen according to the pointing direction of the current laser pen. The device comprises a laser pen and an upper computer. A camera and an image recognition module are arranged on the laser pen, and an image collected by the camera is coupled with the orientation of the laser pen; judging whether a laser point irradiated on the display screen by the laser pen is displayed or not through an image recognition module, and determining the position for generating a light spot according to the collected image; the laser pen sends the position information of the generated light spots to the upper computer through wireless communication, and the upper computer ge