Display device, vehicle

A display device for displaying a virtual image in front of a driver of a vehicle, the display device comprising:

• an illuminance detecting unit configured to receive light surrounding the vehicle, and detect a brightness of the received light;
• an uptake angle restricting unit configured to restrict an angle of the light received by the illuminance detecting unit;
• an outside light correcting unit configured to adjust a luminance of a display image, according to the brightness of the light detected by the illuminance detector detecting unit;
• and
• an image displaying unit configured to display the display image by superimposing the display image on a field of vision of the driver as the virtual image, based on a result of adjusting the luminance, wherein
• the uptake angle restricting unit includes a first opening restricting element and a second opening restricting element arranged in parallel on a front side of the illuminance detecting unit, the first opening restricting element being a plate-shaped member having a substantially circular first opening part with a first diameter (φ1, the second opening restricting element being a plate-shaped member having a substantially circular second opening part with a second diameter φ2, the first opening restricting element and the second opening restricting element being spaced apart by a predetermined interval d such that an angle θ2 at which the illuminance detecting unit receives the light is restricted according to an angle θ1 formed by light beams directed from the display image toward eyes of the driver, and
• a relationship between the first diameter φ1, the second diameter φ2, the predetermined interval d, the angle θ2, and the angle θ1 is set such that θ1<θ2=2arctan{(φ2+φ1)/(2d)}<C×θ1, where C is a predetermined constant determined based on a value of θ2/θ1 at which a deviation between the luminance of the display image and a brightness of a background of the display image becomes greater than a prescribed value.