Single-layer color holographic optical waveguide display apparatus

A single-layer color holographic optical waveguide display apparatus, comprising an image output apparatus, a coupling-in grating, a coupling-out grating, and an optical waveguide;

• wherein
• the image output apparatus comprises a microdisplay and a collimating lens assembly, wherein the microdisplay outputs image light of red, green, and blue wavelengths, the image light is emitted into the optical waveguide through the collimating lens assembly, and the image light of red, green, and blue wavelengths corresponds to different fields of view, respectively;
• the coupling-in grating and the coupling-out grating are both slanted holographic volume gratings;
• the coupling-in grating and the coupling-out grating have identical grating periods;
• and
• the coupling-in grating responds to the image light of red, green, and blue wavelengths, the image light then propagates to the coupling-out grating through the optical waveguide in a total internal reflection manner, and is ultimately emitted through the coupling-out grating to form a single-layer color display image with Bragg angles corresponding to the red, green, and blue wavelengths sequentially arranged and interconnected.