Abstract: A diffraction optical waveguide structure is provided. The diffraction optical waveguide structure includes a light-guiding layer, a coupling-in region, a deflecting region and a coupling-out region, all disposed on the light-guiding layer, and are sequentially arranged along a direction of an optical path. The coupling-in region, the deflecting region and the coupling-out region are all configured with a first diffractive microstructure layer. Additionally, the diffraction optical waveguide structure further includes a light-homogenizing region, the light-homogenizing region is arranged between the deflecting region and the coupling-out region, the light-homogenizing region is configured with a second diffractive microstructure layer, the second diffractive microstructure layer is configured to spatially redistribute energy of lights.

Abstract: A diffractive optical waveguide includes: an optical waveguide substrate, at least one coupling-in grating, at least one relay grating, and at least one coupling-out grating. The coupling-in grating is arranged in the coupling-in region. The relay grating is arranged in the relay region. The coupling-out grating is arranged in the coupling-out region. The relay grating and the coupling-out grating are both two-dimensional gratings. The coupling-in region and the coupling-out region are both symmetrical in shape, the relay grating is symmetrical or asymmetrical in shape. Thus, the relay grating can change a transmission path of part of lights, the lights coupled-in from the coupling-in grating can be transmitted to the coupling-out region through the relay grating and cover the entire coupling-out region, avoiding the problem of dark angle of fields of view in the coupling-out region and improving energy utilization efficiency of the lights.

Abstract: An optical waveguide device includes a light source structure, and an optical waveguide structure having at least one coupling-in structures and at least one coupling-out structures. An initial light beam can be coupled into the optical waveguide structure from the coupling-in structure and coupled-out multiple light beams from the coupling-out structure. A distance between a polygonal vertex of a coupling-out light beam and a polygonal adjacent edge of an adjacent coupling-out light beam is not greater than a preset threshold. When the initial light beam exit pupil expands, a distance between the polygonal vertex of the coupling-out light beam and the adjacent edge of the adjacent coupling-out light beam is less than the preset threshold, therefore, less overlap and gaps are formed by the polygonal coupling-out light beam, and the energy distribution uniformity is improved.

Abstract: An optical combiner and a display device are provided. The optical combiner includes a light-transmitting structure and a waveguide structure in the light-transmitting structure. The waveguide structure includes a first dielectric layer, a waveguide plate, and a second dielectric layer arranged in sequence. The waveguide plate includes a coupling-out region, wherein the refractive index of the first dielectric layer and the refractive index of the second dielectric layer are both less than the refractive index of the waveguide plate. Since the refractive index of the first dielectric layer and the refractive index of the second dielectric layer are both less than the refractive index of the waveguide plate, light beams propagating in the waveguide plate undergo totally reflection during propagation and cannot be refracted into the first dielectric layer and the second dielectric layer.

Abstract: A stacked grating and an AR display device are provided. The stacked grating includes at least two grating layers stacked from bottom to top sequentially. Grating grooves are arranged in each of the grating layers in a distribution pattern. The distribution patterns of the grating grooves in a horizontal direction are distinct from each other for each two adjacent ones of the grating layers, and the distribution patterns of the grating grooves of two grating layers arranged with one grating layer between them in the horizontal direction are the same. As such, the stacked grating is equivalent to a bulk grating, and the transmission/reflection selectivity of grating diffraction is improved, thus reducing privacy disclosure and increasing the energy utilization rate.

Abstract: A method for correcting interference fringes includes: obtaining correction parameter sets of different photographing distances; obtaining a to-be-corrected image and calculating an average depth value of the to-be-corrected image; selecting a target correction parameter set corresponding to the average depth value from the correction parameter sets of different photographing distances; and correcting first pixel values of to-be-corrected pixels at the different coordinate positions in the to-be-corrected image according to different target correction parameters corresponding to the different coordinate positions in the target correction parameter set, to obtain a corrected image. Each of the correction parameter sets includes different correction parameters corresponding to different coordinate positions. The average depth value includes an average value of depth values corresponding to a plurality of to-be-corrected pixels in the to-be-corrected image.

Abstract: A method for correcting interference fringes includes: obtaining interference fringe images with different photographing distances; obtaining a to-be-corrected image including to-be-corrected pixels, and calculating a depth value of each to-be-corrected pixel in the to-be-corrected image; selecting, from the interference fringe images with different photographing distances, an interference fringe image corresponding to the depth value of each to-be-corrected pixel as a target interference fringe image; extracting first pixel values of target coordinate positions in the target interference fringe image; and correcting second pixel values of to-be-corrected pixels according to the first pixel values corresponding to the to-be-corrected pixels to obtain a corrected image.