Display device

A display device that displays a virtual image of a first picture and a virtual image of a second picture by using a display medium, the display device comprising:

• a light source that emits light;
• a fixed screen fixedly disposed on an optical path between the light source and the display medium;
• a movable screen disposed on the optical path;
• a driver that translates the movable screen along the optical path;
• and
• a scanner that scans the fixed screen and the movable screen with the light emitted from the light source to form the first picture on the fixed screen and the second picture on the movable screen,
• wherein the scanner sequentially scans the movable screen and the fixed screen as a series of scanning processes,
• wherein the driver linearly translates the movable screen along the optical path, and
• wherein the movable screen is a physical structure.