Head-up display was originally used in fighter planes. Since it can be used on the plane, it can certainly meet the conditions of use in the car. HUD display, actually reading various information of the vehicle (vehicle speed, engine water temperature, fuel consumption, etc.). ) from the OBD interface on the vehicle, and then projected onto the windshield with high-brightness LED. The structure and use are relatively simple. Personally, head-up display can not only enhance the sense of science and technology, but also keep the driver's line of sight in front, which is the original intention of head-up display design. As a configuration to improve safe driving, head-up display is really practical, but the premise is that it can't display too much information, otherwise it will be counterproductive.