DIFFRACTIVE OPTICAL WAVEGUIDE, AUGMENTED REALITY GLASSES, AND AUGMENTED REALITY DISPLAY DEVICE

This application provides a diffractive optical waveguide, augmented reality glasses, and an augmented reality display device. The diffractive optical waveguide includes: a waveguide substrate and a plurality of functional regions located on a surface of the waveguide substrate. The functional regions include an in-coupling grating region, a turning region, and an out-coupling grating region. The turning region is arranged in parallel with the in-coupling grating region along a first direction. The out-coupling grating region is arranged in parallel with the turning region along a second direction. The first direction and second direction are perpendicular to each other. The turning region is provided with a plurality of elliptical through holes. The elliptical through holes are arranged at intervals and distributed in the turning region and penetrate from a top surface of the waveguide substrate to a bottom surface of the waveguide substrate.