Head-up display system

The invention discloses a head-up display system, which is applied to the technical field of head-up display and comprises an imaging device, a first reflective mirror and an electro-reflective mirror, projection light rays of the imaging device sequentially pass through the first reflective mirror and the electro-reflective mirror to enter a visual range; the electro-reflective mirror controls the generation of a metal deposition film by controlling the voltage holding time to form a Fresnel morphology; and the light path of the projection light is changed through the electro-reflective mirror. According to the invention, the imaging effect is improved by changing the light path and reducing the glass transmittance. And glare can be effectively prevented by reducing the brightness of the windshield glass. When the automobile stops driving, the temperature in the automobile can be obviously increased under the sun illumination. At the moment, the windshield glass can be changed into a metal deposition film th