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CN-121995574-A - Diffraction optical waveguide device and AR display device

CN121995574ACN 121995574 ACN121995574 ACN 121995574ACN-121995574-A

Abstract

The application relates to the technical field of display equipment, and discloses a diffraction optical waveguide device and an AR display equipment. The diffraction optical waveguide device comprises an optical waveguide substrate, and a coupling-in region, a turning region and a coupling-out region which are arranged on the optical waveguide substrate, wherein the turning region consists of a first turning grating region and a second turning grating region, the second turning grating region is arranged on one side of the first turning grating region far away from the coupling-in region, the grating depth in the first turning grating region is smaller than the grating depth in the second turning grating region, the area of the first turning grating region is larger than the area of the second turning grating region, and the area ratio of the first turning grating region to the second turning grating region is 5.2-8. The turning region adopts a less partition design, and the first turning refractive grating region adopts a small-depth large-area design, so that the process and difficulty are simplified, the processing error is reduced, the robustness and the processing yield are improved, and the overall light efficiency and uniformity of the turning region can be ensured.

Inventors

  • XIE JIANLAI
  • CHEN HUIKANG
  • ZHAO YIHUA
  • LIU HUAYU
  • LIN WEIZHI
  • HONG JUEHUI

Assignees

  • 蓝思科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260212

Claims (10)

  1. 1. A diffractive optical waveguide device, comprising an optical waveguide substrate (100) and a coupling-in region (200), a turning region (300) and a coupling-out region (400) arranged on the optical waveguide substrate (100), wherein the turning region (300) is composed of a first turning grating sub-region (310) and a second turning grating sub-region (320), and the second turning grating sub-region (320) is arranged at one side of the first turning grating sub-region (310) away from the coupling-in region (200); Wherein the grating depth in the first turning grating sub-region (310) is smaller than the grating depth in the second turning grating sub-region (320), the area of the first turning grating sub-region (310) is larger than the area of the second turning grating sub-region (320), and the area ratio of the first turning grating sub-region (310) to the second turning grating sub-region (320) is in the range of 5.2-8.
  2. 2. The diffractive optical waveguide device according to claim 1, characterized in that the area of the first turning grating sub-region (310) is defined as α and the area of the second turning grating sub-region (320) is defined as β, wherein 6 7。
  3. 3. The diffractive optical waveguide device according to claim 1, characterized in that the turning region (300) has a long bottom edge (301), a first narrow side edge (302) and a second narrow side edge (303), the long bottom edge (301) being close to the coupling-out region (400), the first narrow side edge (302) being located at an end of the long bottom edge (301) close to the coupling-in region (200) and intersecting the long bottom edge (301) at a point a, the second narrow side edge (303) being located at an end of the long bottom edge (301) remote from the coupling-in region (200); The first turning grating sub-region (310) and the second turning grating sub-region (320) are provided with partition boundary lines (304), the partition boundary lines (304) and the second narrow side edges (303) are intersected at a point C, an included angle between a connecting line between the points AC and a coupling grating vector of the coupling-in region (200) is 5-5.5 degrees, and the direction of the coupling grating vector is perpendicular to the grating lines in the coupling-in region (200).
  4. 4. The diffractive optical waveguide device according to claim 1, characterized in that a partition boundary line (304) is provided between the first turning grating sub-region (310) and the second turning grating sub-region (320), the extension direction of the partition boundary line (304) being parallel to the grating line direction in both the first turning grating sub-region (310) and the second turning grating sub-region (320).
  5. 5. The diffractive optical waveguide device according to claim 1, characterized in that the grating ridge width in the first turning grating sub-region (310) coincides with the grating ridge width in the second turning grating sub-region (320); And/or the grating period in the first turning grating sub-region (310) coincides with the grating period in the second turning grating sub-region (320); and/or, the grating duty cycles of the first turning grating sub-region (310) and the second turning grating sub-region (320) are identical.
  6. 6. The diffractive optical waveguide device according to claim 1, characterized in that the grating duty cycle of the first turning grating sub-region (310) and the second turning grating sub-region (320) is 40% -50%.
  7. 7. The diffractive optical waveguide device according to claim 1, characterized in that the grating depth in the first turning grating sub-region (310) is h1 and the grating depth in the second turning grating sub-region (320) is h2, satisfying that h1:h2=1, (1.307-1.545); And/or, the grating depth of the first turning grating region (310) ranges from 55nm to 65nm, and the grating depth of the second turning grating region (320) ranges from 70nm to 101nm.
  8. 8. The diffractive optical waveguide device according to any one of claims 1 to 7, characterized in that the grating depth in the first turning grating sub-region (310) is h1, the grating depth in the second turning grating sub-region (320) is h2, the grating ridge width of the first turning grating sub-region (310) or the second turning grating sub-region (320) is d, the grating period of the first turning grating sub-region (310) or the second turning grating sub-region (320) is p; wherein, satisfy 1.9 2.16, And/or 0.9 1.1。
  9. 9. The diffractive optical waveguide device according to claim 1, characterized in that a plurality of consecutive out-coupling grating sub-sections are provided in the out-coupling region (400) in a direction away from the turning region (300); Wherein the area of the out-coupling grating sub-division near the turning region (300) is larger than the area of the other out-coupling grating sub-divisions.
  10. 10. An AR display device characterized by comprising a diffractive optical waveguide arrangement according to any one of claims 1-9.

Description

Diffraction optical waveguide device and AR display device Technical Field The application belongs to the technical field of display equipment, and particularly relates to a diffraction optical waveguide device and AR display equipment. Background With the rapid development of modern portable wearable electronic devices, augmented reality (Augmented Reality, AR) technology has a wide application prospect in the fields of industry, education, outdoor, entertainment, travel and the like, and is widely focused and gradually applied to actual scenes. The optical waveguide acts as a key optical component in the AR device, whose uniformity of out-coupling brightness directly affects the user experience. To achieve better brightness uniformity, existing designs typically divide the turning region of the optical waveguide into multiple (typically more than two) sub-regions, and employ different parameter settings for each sub-region. However, this multi-zone design also significantly increases the complexity of the process, placing higher demands on process accuracy and manufacturing yield, and further increasing manufacturing costs. Therefore, how to simplify the structural design and reduce the process difficulty as much as possible while ensuring the optical properties such as uniformity of the light emitted by the light waves has become a key problem to be solved in the current field. Disclosure of Invention The application aims to provide a diffraction optical waveguide device and AR display equipment, which are used for solving the problems of high processing complexity, low yield and high cost of the traditional optical waveguide because the turning area of the optical waveguide is divided into a plurality of subareas. In order to achieve the above object, a first aspect of the present application provides a diffractive optical waveguide device, including an optical waveguide substrate, and a coupling-in region, a turning region and a coupling-out region disposed on the optical waveguide substrate, where the turning region is composed of a first turning grating sub-region and a second turning grating sub-region, and the second turning grating sub-region is disposed on a side of the first turning grating sub-region away from the coupling-in region; The grating depth in the first turning grating sub-region is smaller than the grating depth in the second turning grating sub-region, the area of the first turning grating sub-region is larger than that of the second turning grating sub-region, and the area ratio of the first turning grating sub-region to the second turning grating sub-region is in the range of 5.2-8. As a further improvement of the above technical scheme: In some embodiments, the area of the first turning grating region is defined as α and the area of the second turning grating region is defined as β, where 6 7。 In some embodiments, the turning region has a long bottom edge, a first narrow side edge and a second narrow side edge, the long bottom edge being adjacent to the coupling-out region, the first narrow side edge being located at an end of the long bottom edge adjacent to the coupling-in region and intersecting the long bottom edge at a point a, the second narrow side edge being located at an end of the long bottom edge remote from the coupling-in region; The first turning grating sub-region and the second turning grating sub-region are provided with partition boundary lines, the partition boundary lines and the second narrow side edges are intersected at a point C, the included angle between the connecting line between the points AC and the coupling-in grating vector of the coupling-in region is 5-5.5 degrees, and the direction of the coupling-in grating vector is mutually perpendicular to the grating lines in the coupling-in region. In some embodiments, there is a zoned border line between the first turning grating subregion and the second turning grating subregion, and the extension direction of the zoned border line is parallel to the grating line direction in the first turning grating subregion and the second turning grating subregion. In some embodiments, the grating ridge width in the first turning grating subregion is identical to the grating ridge width in the second turning grating subregion; and/or the grating period in the first turning grating subregion is consistent with the grating period in the second turning grating subregion; and/or, the grating duty ratios of the first turning grating subregion and the second turning grating subregion are consistent. In some embodiments, the grating duty cycle of the first turning grating sub-region and the second turning grating sub-region is 40% -50%. In some embodiments, the grating depth in the first turning grating sub-region is h1 and the grating depth in the second turning grating sub-region is h2; Wherein, h1 is satisfied, h2=1, (1.307-1.545); and/or the grating depth of the first turning grating sub-region ranges from 55nm to 65nm