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CN-122018073-A - Binocular diffraction optical waveguide and near-to-eye display device

CN122018073ACN 122018073 ACN122018073 ACN 122018073ACN-122018073-A

Abstract

The application provides a binocular diffractive optical waveguide, which comprises a monolithic waveguide substrate, wherein the monolithic waveguide substrate is provided with a left eye optical path region and a right eye optical path region, the left eye optical path region comprises a left eye coupling-in region and a left eye coupling-out region, the right eye optical path region comprises a right eye coupling-in region and a right eye coupling-out region, the left eye coupling-in region and the right eye coupling-in region are both arranged close to the central line of the monolithic waveguide substrate, the waveguide outline of the right eye optical path region is designed so that the non-working order of the image light which is diffracted by a grating structure in the left eye coupling-in region and faces the direction of the right eye optical path region does not enter the right eye optical path region, and the waveguide outline of the left eye optical path region is designed so that the non-working order of the image light which is diffracted by the grating structure in the right eye coupling-in region faces the direction of the left eye optical path region does not enter the left eye optical path region. The application can realize true 3D display, has compact structure and comfortable wearing, and simultaneously can inhibit binocular crosstalk.

Inventors

  • HU XUELEI
  • LOU XINYE
  • ZHANG YAQIN

Assignees

  • 上海鲲游科技有限公司

Dates

Publication Date
20260512
Application Date
20260416

Claims (10)

  1. 1. The binocular diffractive optical waveguide comprises a monolithic waveguide substrate, wherein the monolithic waveguide substrate is provided with a left eye optical path region and a right eye optical path region, the left eye optical path region comprises a left eye coupling-in region and a left eye coupling-out region, the right eye optical path region comprises a right eye coupling-in region and a right eye coupling-out region, the left eye coupling-in region and the right eye coupling-in region are both arranged close to the central line of the monolithic waveguide substrate, the waveguide outline design of the right eye optical path region is such that the non-working order of the image light in the direction of the right eye optical path region after being diffracted by the grating structure in the left eye coupling-in region does not enter the right eye optical path region, and the waveguide outline design of the left eye optical path region is such that the non-working order of the image light in the direction of the left eye optical path region after being diffracted by the grating structure in the right eye coupling-in region does not enter the left eye optical path region.
  2. 2. The binocular diffractive optical waveguide of claim 1, wherein the monolithic waveguide substrate is bilaterally symmetric with a local asymmetry at an upper portion of the midline, the left-eye coupling-in region center and the right-eye coupling-in region center are mirror symmetric about the midline, and the left-eye coupling-in region is different in size from the right-eye coupling-in region.
  3. 3. The binocular diffractive optical waveguide of claim 2, wherein the left eye incoupling region is sized to The method meets the following conditions: the size of the right-eye coupling-in area The method meets the following conditions: Wherein L is the distance from the exit pupil of the projector to the monolithic waveguide substrate, For the angle of view of the left eye of the binocular diffractive optical waveguide, For the field angle of the right eye of the binocular diffractive optical waveguide, For the exit pupil diameter of the projection optics, For the thickness of the monolithic waveguide substrate, For the diffraction angle of the image light after passing through the left-eye coupling-in region, For the diffraction angle of the image light after passing through the right-eye coupling-in region, The range of the value of (2) is 0.3-1 mm.
  4. 4. The binocular diffractive optical waveguide according to claim 1, wherein a grating structure is provided in the entire region on the surface of the monolithic waveguide substrate, the center position of the left-eye optical path region corresponds to the center of the left-eye pupil, the center position of the right-eye optical path region corresponds to the center of the right-eye pupil, the lateral dimension of the left-eye optical path region and/or the right-eye optical path region ranges from 35 to 40mm, the longitudinal dimension of the left-eye optical path region and/or the right-eye optical path region ranges from 35 to 40mm, the distance between the center position of the left-eye coupling region and the center position of the left-eye optical path region in the lateral direction ranges from 12 to 16mm, the distance between the center position of the right-eye coupling region and the center position of the right-eye optical path region in the lateral direction ranges from 12 to 16mm, and the distance between the center position of the right-eye coupling region in the longitudinal direction ranges from 4 to 8mm.
  5. 5. The binocular diffractive optical waveguide of claim 1, wherein a grating structure is disposed in a partial region on the surface of the monolithic waveguide substrate, the partial region including at least the left-eye coupling-in region, the left-eye coupling-out region, the right-eye coupling-in region, and the right-eye coupling-out region, wherein a distance between a center position of the left-eye coupling-in region and a center position of the left-eye coupling-out region in a lateral direction is in a range of 25-32mm, a distance between a center position of the right-eye coupling-in region and a center position of the right-eye coupling-out region in a longitudinal direction is in a range of 5-15mm, and a distance between a center position of the right-eye coupling-in region and a center position of the right-eye coupling-out region in a lateral direction is in a range of 25-32 mm.
  6. 6. The binocular diffractive optical waveguide of any one of claims 1-5, wherein the binocular junction of the monolithic waveguide substrate is a deep arcuate structure having a groove bottom no higher than the higher of the center position of the left-eye coupling-in region and the center position of the right-eye coupling-in region, and a groove bottom no lower of the lowest position of the left-eye coupling-in region and the lowest position of the right-eye coupling-in region.
  7. 7. The binocular diffractive optical waveguide of claim 6, wherein a one-dimensional left incoupling grating is disposed in the left-eye incoupling region, the unit vector of the one-dimensional left incoupling grating direction being , The +1 order of the image light incident on the one-dimensional left coupling-in grating after diffraction is the working order, the transmission direction of the-1 order and the waveguide outline of the right eye optical path region should satisfy: Wherein, the For the size of the left-eye coupling-in region, For the center position coordinates of the left-eye in-coupling region, For the angle of incidence of the image light rays into the left-eye coupling-in region, For the grating period of the one-dimensional left incoupling grating, For the refractive index of the monolithic waveguide substrate, For the operating wavelength of the left eye optical path region, For the linear equation of the transmission direction of the-1 order of the left eye light path region, And (3) taking a curve equation of the outer contour of the waveguide in the right eye light path area.
  8. 8. The binocular diffractive optical waveguide of any one of claims 1-5, wherein the left eye optical path region is different from the wavelength band of the image light transmitted by the right eye optical path region.
  9. 9. The binocular diffractive optical waveguide of claim 7, wherein the wavelength band of the image light transmitted by one of the left-eye and right-eye optical regions is a red-green wavelength band, the wavelength band of the image light transmitted by the other optical region is a blue-green wavelength band, or the wavelength band of the image light transmitted by one of the left-eye and right-eye optical regions is a full wavelength band, and the wavelength band of the image light transmitted by the other optical region is a green wavelength band.
  10. 10. A near-eye display device, comprising a left-eye optical machine, a right-eye optical machine, and the binocular diffractive optical waveguide of any one of claims 1-9, wherein the left-eye optical machine corresponds to the left-eye optical path region for independently controlling opening and closing of a left-eye optical path, and the right-eye optical machine corresponds to the right-eye optical path region for independently controlling opening and closing of a right-eye optical path.

Description

Binocular diffraction optical waveguide and near-to-eye display device Technical Field The application relates to the technical field of augmented reality display, in particular to a binocular diffraction optical waveguide and near-eye display equipment. Background Augmented reality is a technology that merges real world and virtual information, and an augmented reality display system typically includes a micro projector and an optical display screen, where the micro projector provides virtual display content for the augmented reality display system to be projected into the human eye through the optical display screen, which is typically a transparent optical component, so that a user can see the real world through the optical display screen at the same time. The prior consumer-grade AR glasses adopt a single-ray machine dual-purpose technical scheme for reducing the cost, but the fixed light path provided by the technical scheme is difficult to adapt to different interpupillary distances, so that the problems of ghost and eyestrain are easy to occur, real 3D display is not supported, the optical performance is limited by the design of a shared light path of a single-ray machine dual-purpose structure, and the technical bottleneck for restricting the development of the consumer-grade AR glasses to the high-performance, comfortable and real 3D directions is gradually formed. Disclosure of Invention The application provides a binocular diffraction optical waveguide, which realizes true 3D display through the design of double coupling and middle placement of a single-chip waveguide, has compact structure and comfortable wearing, optimizes the optical path and the outline, avoids crosstalk between left eyes and right eyes, and improves imaging quality. The binocular diffractive optical waveguide comprises a monolithic waveguide substrate, wherein the monolithic waveguide substrate is provided with a left eye optical path region and a right eye optical path region, the left eye optical path region comprises a left eye coupling-in region and a left eye coupling-out region, the right eye optical path region comprises a right eye coupling-in region and a right eye coupling-out region, the left eye coupling-in region and the right eye coupling-in region are both arranged close to the central line of the monolithic waveguide substrate, the waveguide outline of the right eye optical path region is designed so that the non-working order of the image light in the direction of the right eye optical path region after being diffracted by a grating structure in the left eye coupling-in region does not enter the right eye optical path region, and the waveguide outline of the left eye optical path region is designed so that the non-working order of the image light in the direction of the left eye optical path region after being diffracted by a grating structure in the right eye coupling-in region does not enter the left eye optical path region. The single-piece waveguide substrate is bilaterally symmetrical and has local asymmetry at the upper part of the midline, the center of the left-eye coupling-in region and the center of the right-eye coupling-in region are mirror-symmetrical about the midline, and the size of the left-eye coupling-in region is different from the size of the right-eye coupling-in region. Practically, the size of the left-eye in-coupling regionThe method meets the following conditions: the size of the right-eye coupling-in area The method meets the following conditions: Wherein L is the distance from the exit pupil of the projector to the monolithic waveguide substrate, For the angle of view of the left eye of the binocular diffractive optical waveguide,For the field angle of the right eye of the binocular diffractive optical waveguide,For the exit pupil diameter of the projection optics,For the thickness of the monolithic waveguide substrate,For the diffraction angle of the image light after passing through the left-eye coupling-in region,For the diffraction angle of the image light after passing through the right-eye coupling-in region,The range of the value of (2) is 0.3-1 mm. In an embodiment, a grating structure is disposed in the whole area on the surface of the monolithic waveguide substrate, the center position of the left eye optical path area corresponds to the center of the left eye pupil, the center position of the right eye optical path area corresponds to the center of the right eye pupil, the lateral dimension of the left eye optical path area and/or the right eye optical path area ranges from 35 mm to 40mm, the longitudinal dimension of the left eye optical path area and/or the right eye optical path area ranges from 35 mm to 40mm, the distance between the center position of the left eye coupling area and the center position of the left eye optical path area in the lateral direction ranges from 12mm to 16mm, the distance between the center position of the right eye coupling area and the c