Head-up display system

A head-up display (HUD) system performing communication in connection with a mobile device, comprising:

• a head-up display device installed in a vehicle for displaying a video in front of the vehicle viewed from a driver;
• a communication unit for connecting the mobile device with the HUD device and establishing communication;
• a speaker for outputting sounds to the driver;
• a microphone for picking up voices of the driver;
• a sound recognition unit for analyzing the voices picked up by the microphone;
• and
• an in-vehicle camera for photographing a face of the driver,
• wherein the HUD device includes:
• a signal processing unit that performs signal processing of sound signals and image signals that are propagated between the mobile device, the speaker, the microphone, and the in-vehicle camera;
• and
• a display control unit that controls the display of videos on the display screen of the HUD device,
• wherein conversation operations are performed by the driver via the mobile device by using the speaker and the microphone,
• wherein a calling indication of the mobile device is displayed on the display screen of the HUD device, and at the same time, an incoming call sound is output from the speaker when there is an incoming call at the mobile device,
• wherein on the basis of a result of an analysis of voices uttered by the driver performed by the sound recognition unit, the conversation operations of the mobile device are started or ended, and
• wherein, if the signal processing unit receives an image posted to the mobile device by an external terminal while the vehicle is moving along a road that is congested with traffic or near to an accident site, the display control unit displays the received image in a superimposed manner onto the display screen of the HUD device, and at the same time, the display control unit deletes other display images so that an image display area rate in the display area becomes a regulated value or less and preferentially displays the received image.