Apparatus for projecting spatial image

An apparatus for projecting a spatial image, the apparatus comprising:

• a screen;
• a projection optical unit to alternately project, onto the screen, the spatial image at a first time and a background image at a second time;
• a spatial image projection unit disposed between the screen and the projection optical unit and reflecting the spatial image displayed on the screen to be projected into a predetermined space;
• and
• a shutter unit disposed between the projection optical unit and the spatial image projection unit, passing the spatial image projected by the projection optical unit at the first time, and blocking the background image projected by the projection optical unit at the second time.

An apparatus for projecting a spatial image, the apparatus comprising:

• a first polarizer to block the spatial image having a first polarization;
• a second polarizer arranged at a distance from the first polarizer, passing the spatial image having the first polarization, and blocking a background image having a second polarization;
• a spatial image projection unit disposed between the first polarizer and the second polarizer and reflecting the spatial image blocked by the first polarizer to be projected into a predetermined space;
• a first projection optical unit to project the spatial image to the first polarizer at a first time;
• and
• a second projection optical unit to project the background image to the second polarizer at a second time,
• wherein the spatial image and the background image are alternately projected.