Display device, display method and display medium

A display method for a display device, wherein the display device has:

• a light transmitting display medium, the display medium having a plate-shape such that a wedge angle between an outside surface and an inside surface of the medium within a predetermined height range of the display medium continuously decreases with increasing of the height of the display medium;
• and
• a projector that projects light expressing an image onto the display medium such that the light is reflected toward a user by the display medium and changes a display distance between an eye of the user and a position of an image visually recognized as a virtual image by the user,
• the display method comprising:
• changing the display distance such that at an upper end of the predetermined height range, a display distance of an upper part of the image is longer than a display distance of a lower part of the same image at a lower end of the predetermined height range.

A light-transmissive display medium used in a projector, the light-transmissive display medium comprising:

• a plate-shaped display, wherein:
• a wedge angle between an outside surface and an inside surface of the medium within a predetermined height range of the display continuously decreases with increasing of the height of the display,
• the display is configured to display light expressing an image projected by the projector such that the display reflects light toward a user,
• a display distance between an eye of the user and a position of an image visually recognized as a virtual image by the user is changed by the projector, and
• at an upper end of the predetermined height range, a display distance of an upper part of the image is changed by the projector to be longer than a display distance of a lower part of the same image at a lower end of the predetermined height range.