System and method for 3D holographic display using spatial-division multiplexed diffractive optical elements for viewing zone improvement
In the present invention, by providing a 3D holographic display system comprising a modulation apparatus configured to modulate light emitted from a light source into a light wave corresponding to a 3D image, an optical apparatus configured to propagate the light wave into the first plane, and a diffraction apparatus configured to multiplex the propagated light wave to extend viewing angle of the 3D holographic display, a limited viewing zone of the holographic display determined by the SLM pixel pitch, may be extended by optical methods, such as using diffractive optical elements (DOE) for spatial-division multiplexing (SDM).
1. A 3D holographic display system, comprising:
a SLM (spatial light modulator) configured to modulate light into a light wave;
a spatial filter configured to remove noise from the light wave;
an optical apparatus configured to propagate the light wave; and
a DOE (diffractive optical unit) configured to multiplex the propagated light wave.
2. The system of claim 1 , wherein:
the DOE deflects propagation direction of the propagated light wave.
3. The system of claim 1 , wherein:
the DOE consists of transparent material or reflective material.
4. The system of claim 1 , wherein:
the optical apparatus is a telescope optical apparatus or projection optical apparatus.
5. The system of claim 1 , wherein:
the optical apparatus propagates the noise-removed light wave on a SLM image plane,
the DOE includes a plurality of partial lattices, and
each of the a plurality of partial lattice is mapped to a SLM image pixel group including a plurality of SLM image pixels formed by the light wave on the SLM image plane, and deflects propagation direction of the light wave propagated to the SLM image plane into a specific direction.
6. The system of claim 5 , wherein:
the DOE includes a diffraction unit that includes some partial lattices of the plurality of partial lattices, and
the diffraction unit deflects the propagation direction of some light waves propagated to some SLM image pixel groups mapped to the some partial lattices into a predetermined area.
7. The system of claim 6 , wherein:
the diffraction unit propagates the propagation direction of the some light waves propagated to the some SLM image pixel group mapped to the some partial lattice to a predetermined viewing zone.
8. The system of claim 7 , wherein:
the SLM modulates the light into a light wave that includes information about the image corresponding to the view point in the predetermined viewing zone.
9. The system of claim 6 , wherein:
the diffraction unit changes diffraction angle of the some light waves propagated to the some SLM image pixel groups mapped to the some partial lattices to a predetermined angle.
10. The system of claim 6 , wherein:
each of the partial lattices is mapped to a plurality of SLM image pixels continuously positioned on the SLM image plane.
11. The system of claim 7 or claim 8 , wherein:
each of diffraction unit contains a plurality of partial lattices irregularly located among the plurality of partial lattices.