Information Display Device and Information Display Method

An information display method, comprising:

• emitting a holographic three-dimensional light field to a first grating using a spatial light modulator, wherein the holographic three-dimensional light field corresponds to at least two focal planes;
• deflecting, using the first grating, the holographic three-dimensional light field into an optical waveguide;
• propagating, using the optical waveguide, the holographic three-dimensional light field;
• and
• deflecting, using a second grating, three-dimensional object light into the holographic three-dimensional light field that is propagated by the optical waveguide;
• emitting, by the optical waveguide, out the three-dimensional object light
• focusing, at a separation hole of the second grating, using the first grating, zero-order light in the holographic three-dimensional light field from the spatial light modulator;
• and
• absorbing the zero-order light using the separation hole or propagating, using the separation hole, the zero-order light in the optical waveguide in a total reflection manner after focusing the zero-order light in the holographic three-dimensional light field.

An information display device, comprising:

• a first grating;
• an optical waveguide;
• a spatial light modulator configured to emit a holographic three-dimensional light field towards the first grating, wherein the holographic three-dimensional light field corresponds to at least two focal planes, and wherein the first grating is configured to deflect the holographic three-dimensional light field into the optical waveguide, wherein the optical waveguide is configured to propagate the transmitted holographic three-dimensional light field;
• a second grating comprising a separation hole and configured to deflect three-dimensional object light into the holographic three-dimensional light field that is propagated by the optical waveguide, wherein the optical waveguide is configured to emit out the three-dimensional object light, wherein the first grating is further configured to focus, at the separation hole, zero-order light in the holographic three-dimensional light field that comes from the spatial light modulator, and wherein the separation hole is configured to propagate the zero-order light in the optical waveguide in a total reflection manner after focusing the zero-order light in the holographic three-dimensional light field.