DISPLAY DEVICE, HEAD-UP DISPLAY, AND MOTOR VEHICLE

A display device, a head-up display, and a motor vehicle. The display device comprises a projection device (100), a reflection structure (200), and a beam diffusion structure (300). Light emitted from the projection device (100) passes through the beam diffusion structure (300) and is reflected by the reflection structure (200) then to reach a first predetermined region (410); the beam diffusion structure (300) is configured to diffuse a beam passing through the beam diffusion structure (300) but not to change the optical axis of the beam; the reflection structure (200) comprises a plurality of sub-reflection structures (210), the plurality of sub-reflection structures (210) are configured to, in the case of removing the beam diffusing structure (300) from an optical path from the projection device (100) to the first predetermined region (410), reflect the light emitted from the projection device (100) to a second predetermined region (420) within the first predetermined region (410), and the area of the second predetermined region (420) is smaller than that of the first predetermined region (410). The display device is provided with the reflection structure (200) and the beam diffusion structure (300), so that the beam emitted from the projection device (100) covers the eyes of a driver. Therefore, the utilization rate of the beam can be improved to reduce power consumption, the angle of visual field of the display device is increased, and the imaging effect of a large angle of visual field under low power consumption is implemented.