Image output device

An image output device comprising:

• a spatial light modulator including a main surface, a back surface opposing the main surface, and a plurality of pixels arranged two-dimensionally along the main surface in a space between the main surface and the back surface, the spatial light modulator being configured to reflect light emitted to the main surface and modulate a phase of the light in each of the plurality of pixels;
• an image irradiation unit configured to emit a two-dimensional optical image toward the main surface;
• and
• an address light irradiation unit configured to emit address light including a diffraction grating pattern toward the back surface, wherein
• each of the plurality of pixels of the spatial light modulator is configured to change a phase modulation amount according to an intensity of the address light emitted from a side of the back surface,
• the address light irradiation unit is configured to dynamically change a direction of the diffraction grating pattern on the back surface of the spatial light modulator, which is in a stationary state, and
• the image irradiation unit is configured to irradiate the main surface with the two-dimensional optical image corresponding to the direction of the diffraction grating pattern.