Display device, head-up display system and vehicle

The invention discloses a display device, a head-up display system and a vehicle, and relates to the technical field of head-up display. The display device comprises a backlight source and a display panel, the display area of the display panel is divided into a plurality of pixel units capable of controlling light transmission respectively, the backlight source comprises a plurality of light source units corresponding to the pixel units respectively, each light source unit comprises a red light source, a green light source and a blue light source which are respectively controlled to emit light, and the light source units emit color-mixed light beams through the corresponding pixel units so as to realize a color picture of the display device. According to the display device, a color filter layer in an existing color display device is omitted, for each pixel unit, three RGB sub-pixels do not need to be divided, a three-color light source is matched, color display can be achieved, cost and power consumption are