Head-up display system

A head-up display system, adapted to transmit an image beam to a transmissive-reflective element, the head-up display system comprising a picture generating module, wherein:

• the picture generating module comprises a picture generating unit, at least one curved mirror, and a diffuser, the picture generating unit is configured to generate the image beam, the diffuser has a light incident surface, the at least one curved mirror is disposed in a transmission path of the image beam between the picture generating unit and the diffuser, and is configured to control at least one of a light angle and an angle distribution of the image beam incident on the diffuser, so that the image beam is incident on the light incident surface of the diffuser in a first direction, and is transmitted to the transmissive-reflective element after being uniformed by the diffuser,
• wherein a normal direction of the light incident surface of the diffuser has a first included angle that is not 0 relative to the first direction, and the at least one curved mirror is configured to image the image beam on the light incident surface of the diffuser.