Display device

1. A display device comprising:

a light source which is fixed;

a heat dissipator attached to the light source;

a liquid-crystal panel configured to display a virtual image and including a display area and being movable with respect to the light source; and

a controller which, in operation, controls movement of the liquid-crystal panel so as to change a distance between the liquid-crystal panel and the light source,

wherein a size of the display area of the liquid-crystal panel is changeable in accordance with the distance between the liquid-crystal panel and the light source, such that an angle of view of the virtual image remains constant when viewed from a vehicle driver viewpoint, the angle of view being an angular extent of the virtual image that is displayed by the liquid-crystal panel.

2. The display device according to claim 1 ,

wherein brightness of light that is emitted from the light source is to be changed in accordance with the distance between the liquid-crystal panel and the light source, and

wherein the brightness of light emitted from the light source increases as the distance between the liquid-crystal panel and the light source decreases.

3. The display device according to claim 1 ,

wherein the display device is to be mounted to a vehicle, and

the controller changes the distance between the liquid-crystal panel and the light source in accordance with a speed of the vehicle.

4. The display device according to claim 1 ,

wherein the display device is to be mounted to a vehicle, and the controller changes the distance between the liquid-crystal panel and the light source in accordance with an area in which the vehicle is traveling.