Method for manufacturing binocular optical waveguide, and binocular optical waveguide

Abstract

The invention provides a manufacturing method of a binocular optical waveguide and the binocular optical waveguide. The method comprises the following steps: determining a field angle offset of a dual-channel coupled grating according to a field angle of a single-ray machine; according to the field angle offset and the rotation angle of the signal light of the dual-channel turning grating, the target number of light path exposure, a first exposure parameter of the dual-channel coupling-in grating, a second exposure parameter of the dual-channel turning grating and a third exposure parameter of the dual-channel coupling-out grating are determined, and the reference light incident angle in the first exposure parameter is used for expanding the field angle; determining a target number of manufacturing systems, and determining manufacturing parameters of each manufacturing system according to the first, second and third exposure parameters; each manufacturing system attaches a dual-channel coupling-in grating, a turning grating and a coupling-out grating on a waveguide substrate to obtain a binocular optical waveguide, a first channel coupling-in grating and a second channel coupling-in grating in the dual-channel coupling-in grating are overlapped and attached to the waveguide substrate, and binocular display and large-view-field display of the binocular optical waveguide based on a single light machine are achieved.

Description

Technical Field

[0001] The present application relates to the field of optical waveguide technology, and in particular to a method for manufacturing a binocular optical waveguide and a binocular optical waveguide. Background Art

[0002] In the field of augmented reality (AR) display, the ultra-thin and lightweight structure and high light transmittance of volume holographic waveguides enable a natural fusion of virtual images and real environments.

[0003] Currently, two optical engines are typically used to couple image light into the user's left and right eyes through the left and right waveguides of AR glasses, respectively. This is costly. Furthermore, the angular bandwidth of volume holographic gratings is limited, making it difficult to achieve large-field-of-view displays using optical waveguides based on volume holographic gratings. Furthermore, the manufacturing process for volume holographic waveguides requires the use of prisms or masks to couple the light beams, resulting in high production costs and low efficiency.

[0004] Therefore, the design and manufacture of volume holographic waveguides in the prior art have certain limitations. Summary of the Invention

[0005] The purpose of this application is to provide a method for manufacturing a binocular optical waveguide and a binocular optical waveguide to address the above-mentioned deficiencies in the prior art, so as to solve the practical problem that the design and manufacture of volume holographic optical waveguides in the prior art have certain limitations.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a method for manufacturing a binocular optical waveguide, the method comprising:

[0008] Determine the field angle offset of the dual-channel coupled grating according to the field angle of the single-optical machine;

[0009] Determining, based on the field of view angle offset and the rotation angle of the signal light of the preset dual-channel deflection grating, the target number of light path exposures, the first exposure parameter of the dual-channel in-coupling grating, the second exposure parameter of the dual-channel deflection grating, and the third exposure parameter of the dual-channel out-coupling grating, wherein the reference light incident angle in the first exposure parameter is used to expand the field of view angle of the dual-channel in-coupling grating, and the expanded field of view angle is greater than or equal to the field of view angle of the single-light machine;

[0010] Determining the target number of manufacturing systems, and determining manufacturing parameters of each of the manufacturing systems based on the first exposure parameter, the second exposure parameter, and the third exposure parameter, the manufacturing parameters including at least a signal light incident angle and a reference light incident angle;

[0011] The binocular optical waveguide is obtained by laminating the dual-channel in-coupling grating, the dual-channel turning grating and the dual-channel out-coupling grating on the waveguide substrate through various manufacturing systems, wherein the first channel in-coupling grating and the second channel in-coupling grating of the dual-channel in-coupling grating are overlapped and laminarized on the waveguide substrate.

[0012] As an optional implementation, determining the field angle offset of the dual-channel coupling grating according to the field angle of the single optical machine includes:

[0013] If the field of view angle of the single-channel coupling grating is greater than the angular bandwidth of the first-channel coupling grating, the difference between the field of view angle of the single-channel coupling grating and the angular bandwidth of the first-channel coupling grating is used as the field of view angle offset of the dual-channel coupling grating, wherein the angular bandwidth of the first-channel coupling grating is the same as the angular bandwidth of the second-channel coupling grating.

[0014] As an optional implementation, determining the field angle offset of the coupling-in grating according to the field angle of the single-lens optical machine includes:

[0015] If the field of view angle of the single optical machine is less than or equal to the angular bandwidth of the first coupling grating, the field of view angle offset of the dual-channel coupling grating is determined to be zero, wherein the angular bandwidth of the first channel coupling grating is the same as the angular bandwidth of the second channel coupling grating.

[0016] As an optional implementation, determining the target number of light path exposures, the first exposure parameter of the dual-channel in-coupling grating, the second exposure parameter of the dual-channel in-coupling grating, and the exposure parameter of the dual-channel out-coupling grating based on the field of view angle offset and the rotation angle of the signal light of the preset dual-channel turning grating includes:

[0017] Determining the field angle offset of the first channel coupling-in grating and the field angle offset of the second channel coupling-in grating according to the field angle offset;

[0018] The target number of the optical path exposure, the first exposure parameter, the second exposure parameter and the third exposure parameter are determined according to the field of view angle offset of the first channel coupling grating, the field of view angle offset of the second channel coupling grating and the rotation angle of the signal light of the dual-channel turning grating.

[0019] As an optional implementation, determining the field angle offset of the first channel coupling grating and the field angle offset of the second channel coupling grating according to the field angle offset includes:

[0020] The field of view angle offset of the dual-channel coupling grating is divided into the field of view angle offset of the first-channel coupling grating and the field of view angle offset of the second-channel coupling grating according to a preset ratio, wherein the field of view angle offset of the first-channel coupling grating is used to characterize the angle between the reference light of the first-channel coupling grating and the Z-axis, and the field of view angle offset of the second-channel coupling grating is used to characterize the angle between the reference light of the second-channel coupling grating and the Z-axis.

[0021] As an optional implementation, determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0022] When the field of view angle offset of the first-channel coupling-in grating is equal to the field of view angle offset of the second-channel coupling-in grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the target number of the light path exposure is determined to be two. When the difference in the Z-axis component between the dual-channel turning grating and the dual-channel coupling-in grating and the dual-channel coupling-out grating is ignored, the target number of the light path exposure is determined to be one.

[0023] As an optional implementation, determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0024] When the field angle offset of the first channel coupling grating is equal to the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the target number of the light path exposure is determined to be two.

[0025] As an optional implementation, determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0026] When the field angle offset of the first channel coupling-in grating is not equal to the field angle offset of the second channel coupling-in grating, the target number of the light path exposure is determined to be four.

[0027] As an optional implementation, after obtaining the binocular optical waveguide, the method includes:

[0028] The first channel coupling-in grating, the first channel turning grating and the first channel coupling-out grating couple the first portion of light emitted by the single optical machine out to the first region through the first channel;

[0029] The second channel coupling-in grating, the second channel turning grating and the second channel coupling-out grating couple the second portion of light emitted by the single optical engine out to the second region through the second channel.

[0030] In a second aspect, an embodiment of the present application provides a binocular-optical waveguide, comprising a waveguide substrate and a dual-channel in-coupling grating, a dual-channel turning grating, and a dual-channel out-coupling grating located at corresponding positions of the waveguide substrate, wherein the first channel in-coupling grating and the second channel in-coupling grating of the dual-channel in-coupling grating overlap and are bonded to the waveguide substrate.

[0031] The beneficial effects of this application are:

[0032] The present application provides a method for manufacturing a binocular optical waveguide and a binocular optical waveguide. The method determines the field of view angle offset of a dual-channel input grating based on the field of view of a single-light machine. The field of view angle offset of the dual-channel input grating is used to characterize the angle between the reference light of the dual-channel input grating and the Z axis. Based on the field of view angle offset and the rotation angle of the signal light of a preset dual-channel turning grating, the vector relationship between the gratings in the dual channels is analyzed to determine the target number of optical path exposures, the first exposure parameter of the dual-channel input grating, the second exposure parameter of the dual-channel turning grating, and the third exposure parameter of the dual-channel output grating. The field of view of the dual-channel input grating is expanded based on the reference light incident angle in the first exposure parameter. A target number of manufacturing systems is determined, and manufacturing parameters for each manufacturing system are determined based on first, second, and third exposure parameters. The manufacturing parameters include at least the signal light incident angle and the reference light incident angle. Each manufacturing system is used to bond a dual-channel input grating, a dual-channel turning grating, and a dual-channel output grating to corresponding areas of a waveguide substrate. The first and second channel input gratings of the dual-channel input grating are then bonded to the waveguide substrate so that they overlap. By expanding the field of view angle, the dual-channel input grating couples light from all angles of the single-lens machine into the binocular waveguide, forming a binocular waveguide with binocular display and wide field of view capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 Schematic diagram of the manufacturing process of the binocular waveguide provided in the embodiment of the present application Figure 1 ;

[0035] Figure 2A schematic diagram of the layout of a binocular waveguide provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of an expanded field of view angle in a vector circle provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the field of view of a single optical machine and the angular bandwidth of a dual-channel coupled grating provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of an unexpanded field of view in a vector circle provided in an embodiment of the present application;

[0039] Figure 6 Schematic diagram of the manufacturing process of the binocular waveguide provided in the embodiment of the present application Figure 2 ;

[0040] Figure 7 A schematic diagram of recording each grating when the field of view is expanded according to an embodiment of the present application;

[0041] Figure 8 A schematic diagram of recording each grating when the field of view is not expanded according to an embodiment of the present application;

[0042] Figure 9 A schematic diagram of the process of realizing binocular display using a binocular waveguide based on a single optical machine according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0044] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0045] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0046] In the field of AR display, the natural fusion of virtual images and real environments is usually achieved based on volume holographic waveguides. At present, AR displays based on volume holographic waveguides usually require dual optical machines to couple image light, which is relatively expensive. In addition, the angular bandwidth of volume holographic gratings is limited, and optical waveguides based on volume holographic gratings are difficult to achieve large field of view displays. In addition, when manufacturing volume holographic waveguides, prisms or masks are required to couple light beams, resulting in high production costs and low efficiency. In other words, the design and manufacture of volume holographic waveguides in the prior art have certain limitations.

[0047] In response to the above-mentioned problems, an embodiment of the present application provides a method for manufacturing a binocular-eye waveguide. During the manufacturing process of the binocular-eye waveguide, the field of view of the dual-channel coupling grating is expanded according to the field of view of the single-light machine, so that the expanded field of view of the dual-channel coupling grating is greater than or equal to the field of view of the single-light machine. The first channel coupling grating and the second channel coupling grating of the dual-channel coupling grating are overlapped and bonded to the waveguide substrate of the binocular-eye waveguide, thereby realizing binocular display based on the single-light machine and large field of view display after the field of view is expanded.

[0048] Figure 1 Schematic diagram of the manufacturing process of the binocular waveguide provided in the embodiment of the present application Figure 1 ,like Figure 1 As shown, the method includes:

[0049] S101. Determine the field angle offset of the dual-channel coupling grating according to the field angle of the single-optical machine.

[0050] Optionally, optical parameters of the single-lens camera are obtained, and the field of view (FOV) of the single-lens camera is determined based on the optical parameters of the single-lens camera. The field of view of the single-lens camera is used to represent the spatial angle range that can be covered when the light emitted by the camera is emitted.

[0051] To achieve binocular display using a binocular waveguide based on a single-lens camera, a dual-channel coupling grating, a turning grating, and an output grating are required to couple the light emitted by the single-lens camera to two different areas via two light transmission channels. The dual-channel coupling grating may not be able to couple all angles of light from the single-lens camera into the binocular waveguide. In this case, in order to ensure that the final binocular waveguide has a wide field of view, the field of view of the dual-channel coupling gratings needs to be spliced ​​or expanded.

[0052] Specifically, the field of view angle offset of the dual-channel coupling grating is determined based on the field of view angle of the single-channel optical machine and the light coupling capability of the dual-channel coupling grating. The field of view angle offset of the dual-channel coupling grating is used to characterize the angle between the reference light of the dual-channel coupling grating and the Z-axis. When the reference light of the dual-channel coupling grating is at an angle to the Z-axis, the center of the field of view angle of the dual-channel coupling grating will shift in opposite directions. For example, the center of the field of view angle of the first-channel coupling grating in the dual-channel coupling grating shifts along the negative direction of the X-axis, while the center of the field of view angle of the second-channel coupling grating shifts along the positive direction of the X-axis.

[0053] It is worth noting that when the dual-channel coupling grating has a strong light coupling capability and the angular bandwidth is sufficient to cover the field of view of the optical machine, the dual-channel coupling grating can directly couple the light from all angles of the single optical machine into the binocular optical waveguide, without the need to splice or expand the field of view of the dual-channel coupling grating.

[0054] S102. Determine the target number of light path exposures, the first exposure parameter of the dual-channel input grating, the second exposure parameter of the dual-channel input grating, and the third exposure parameter of the dual-channel output grating based on the field of view angle offset and the rotation angle of the signal light of the preset dual-channel turning grating. The reference light incident angle in the first exposure parameter is used to expand the field of view angle of the dual-channel input grating. The expanded field of view angle is greater than or equal to the field of view angle of the single-light machine.

[0055] Optionally, a preset rotation angle of the signal light of the dual-channel turning grating is obtained, wherein the rotation angle of the signal light of the first turning grating in the dual-channel turning grating is the same as the rotation angle of the signal light of the second turning grating in the dual-channel turning grating. Based on the field angle offset of the dual-channel coupling grating and the rotation angle of the signal light of the dual-channel turning grating, the vector relationship between the gratings in the dual channels is analyzed, and the target number of light path exposures is determined based on the vector relationship between the gratings in the dual channels.

[0056] Based on the angle between the reference light of the dual-channel input grating and the Z axis, which is characterized by the field angle offset of the dual-channel coupled grating, and the rotation angle of the signal light of the preset dual-channel turning grating, the first exposure parameter of the dual-channel input grating, the second exposure parameter of the dual-channel turning grating, and the third exposure parameter of the dual-channel output grating are determined based on the equivalent exposure manufacturing conditions of each grating in the dual channel and in combination with the equivalent exposure theory. Each exposure parameter includes at least the reference light incident angle and the object light incident angle of each grating. Specifically, based on the equivalent exposure theory, the holographic photosensitive material is rotated multiple times to achieve spatial decoupling and wavelength decoupling, simplifying the parameters of the equivalent solution space. In the case of grating merging, the equivalent spatial solution meets the prism-free equivalent exposure manufacturing conditions of each grating in the dual channel.

[0057] The angle between the reference light and the Z axis in the reference light incident angle of the dual-channel coupling grating in the first exposure parameters causes the center of the dual-channel coupling grating's field of view to shift in opposite directions. The shifted field of view of the dual-channel coupling grating is then spliced ​​together to obtain an expanded field of view of the dual-channel coupling grating, such that the expanded field of view is greater than or equal to the field of view of the single-light camera. In other words, after the expanded field of view, the dual-channel coupling grating can couple light from all angles of the single-light camera into the binocular optical waveguide. Based on the first exposure parameters, the dual-channel coupling grating in the binocular optical waveguide finally manufactured can achieve a large field of view display.

[0058] S103 , determining a target number of manufacturing systems, and determining manufacturing parameters of each manufacturing system according to the first exposure parameter, the second exposure parameter, and the third exposure parameter, where the manufacturing parameters at least include: a signal light incident angle and a reference light incident angle.

[0059] Optionally, a target number of manufacturing systems is set based on a target number of optical path exposures, and manufacturing parameters for each manufacturing system are determined based on the first exposure parameter, the second exposure parameter, and the third exposure parameter. Prismless equivalent exposure is then used to fabricate each grating in the dual-channel based on the manufacturing parameters of each manufacturing system. The manufacturing parameters of the manufacturing systems include at least the incident angle of the signal light and the incident angle of the reference light when fabricating the corresponding grating using the equivalent exposure.

[0060] During the prism-free equivalent exposure production process of the grating, the manufacturing parameters of the manufacturing system can also include the recording wavelength, reproduction wavelength, refractive index of the holographic photosensitive material, total reflection angle and the rotation angle of the grating vector of each grating around the X-axis, Y-axis and Z-axis respectively, so as to meet the requirements of the prism-free or mask-free equivalent exposure production of each grating in the dual channel.

[0061] It is worth noting that the execution entity of the above steps S101-S103 can be any electronic device with computing and processing capabilities.

[0062] S104. Bonding a dual-channel in-coupling grating, a dual-channel turning grating, and a dual-channel out-coupling grating on a waveguide substrate through various manufacturing systems to obtain a binocular waveguide, wherein a first channel in-coupling grating and a second channel in-coupling grating of the dual-channel in-coupling grating are bonded to the waveguide substrate in an overlapping manner.

[0063] Optionally, during the loading stage, each manufacturing system places the holographic photosensitive material in the area to be exposed of each optical path. During the exposure stage, each manufacturing system performs beam splitting, beam expansion, collimation and rotation on the light emitted by the laser according to each manufacturing condition, so as to form reference light and signal light corresponding to each grating in the dual channel in space that meet the equivalent exposure conditions and field angle expansion conditions, so that the reference light and signal light corresponding to each grating intersect in the area to be exposed of the holographic photosensitive material to form a dual-channel coupling-in grating, a dual-channel turning grating and a dual-channel coupling-out grating.

[0064] Each grating in the dual-channel is sequentially cured, initially die-cut, rotated, secondarily die-cut, and laminated. The dual-channel coupling-in grating, dual-channel turning grating, and dual-channel coupling-out grating are respectively bonded to corresponding areas of the waveguide substrate, and the directions of their grating vectors in the two-dimensional plane are consistent with the designed directions. The first-channel coupling-in grating and the second-channel coupling-in grating of the dual-channel coupling-in grating are overlapped and bonded to the waveguide substrate to form a binocular display waveguide with binocular display and large field of view display functions.

[0065] Specifically, Figure 2 This is a schematic diagram of the layout of the binocular waveguide provided in the embodiment of the present application. Figure 2 For example, the binocular optical waveguide includes a waveguide substrate 100, a first channel coupling-in grating 101, a first channel turning grating 111, a first channel coupling-out grating 121, a second channel coupling-in grating 102, a second channel turning grating 112, and a second channel coupling-out grating 122. For the convenience of illustrating the first channel coupling-in grating 101 and the second channel coupling-in grating 102, Figure 2 There is a slight misalignment between the first-channel coupling grating 101 and the second-channel coupling grating 102. During the actual bonding process, the first-channel coupling grating 101 and the second-channel coupling grating 102 completely overlap. In an AR display scenario, the completely overlapping first-channel coupling grating 101 and the second-channel coupling grating 102 can couple the light emitted by the single-lens machine into the binocular eye waveguide respectively, and finally couple it out to the user's left and right eyes through dual-channel light transmission, realizing binocular display based on the binocular eye waveguide of the single-lens machine.

[0066] Figure 3 This is a schematic diagram of the extended field of view angle in the vector circle provided in the embodiment of the present application. Figure 3For example, the radius of the inner circle of the vector circle is 1, and the radius of the outer circle is n, where n is the refractive index of the holographic photosensitive material. The area within the inner circle represents air, and the area between the inner and outer circles represents the range of the total reflection angle of the holographic photosensitive material. Due to the field of view angle offset of the dual-channel coupled grating, the center of the field of view angle 301 of the first channel in air and the field of view angle 302 of the second channel in air are not located at the center of the circle. Instead, the center of the field of view angle 301 of the first channel in air is offset in the positive direction of the X-axis relative to the center of the circle, while the center of the field of view angle 302 of the second channel in air is offset in the negative direction of the X-axis relative to the center of the circle. Figure 3 The angular bandwidth peak corresponding to the diffraction efficiency of the dual-channel coupling grating is shifted to both sides, but the bandwidths of the two are not completely separated. This is equivalent to expanding the overall bandwidth of the dual-channel coupling grating to a certain extent, achieving the coupling of a larger field of view light, thereby realizing the expansion of the field of view angle of the binocular waveguide.

[0067] Specifically, refer to Figure 2 and Figure 3 The first channel's field of view 301 in air is diffracted by the first channel's input grating 101 and transmitted in the positive direction of the X-axis, entering the interior of the holographic photosensitive material and forming a field of view 311 within the holographic photosensitive material. Light with field of view 311 is deflected by the first channel's deflection grating 111 and reaches the first channel's output grating 121, forming an incident field of view 312 of the first channel's output grating 121. The light is then decoupled by the first channel's output grating 121 and returns to the first channel's field of view 301 in air, achieving field of view transmission for the first channel.

[0068] Correspondingly, the second channel's field of view 302 in air is diffracted by the second channel's input grating 102 and transmitted in the negative direction of the X-axis, entering the interior of the holographic photosensitive material and forming a field of view 321 within the holographic photosensitive material. Light with field of view 321 is deflected by the second channel's deflection grating 112 and reaches the second channel's output grating 122, forming an incident field of view 322 for the second channel's output grating 122. It is then decoupled by the second channel's output grating 122 and returned to the second channel's field of view 302 in air, achieving field of view transmission for the second channel. The first channel's field of view 301 in air and the second channel's field of view 302 in air partially overlap in the X-axis direction, but not completely. Through the field of view transmission path of the first channel and the second channel, field of view splicing and expanded binocular waveguide display are achieved.

[0069] In this embodiment, the field-of-view angle offset of the dual-channel input grating is determined based on the field-of-view of the single-light machine. This field-of-view angle offset characterizes the angle between the reference light of the dual-channel input grating and the Z-axis. Based on the field-of-view angle offset and the rotation angle of the signal light of the preset dual-channel deflection grating, the vector relationship between the gratings in the dual channels is analyzed to determine the target number of optical path exposures, the first exposure parameter of the dual-channel input grating, the second exposure parameter of the dual-channel deflection grating, and the third exposure parameter of the dual-channel output grating. The field-of-view angle of the dual-channel input grating is then expanded based on the reference light incident angle in the first exposure parameter. A target number of manufacturing systems is determined, and manufacturing parameters for each manufacturing system are determined based on first, second, and third exposure parameters. The manufacturing parameters include at least the signal light incident angle and the reference light incident angle. Each manufacturing system is used to bond a dual-channel input grating, a dual-channel turning grating, and a dual-channel output grating to corresponding areas of a waveguide substrate. The first and second channel input gratings of the dual-channel input grating are then bonded to the waveguide substrate so that they overlap. By expanding the field of view angle, the dual-channel input grating couples light from all angles of the single-lens machine into the binocular waveguide, forming a binocular waveguide with binocular display and wide field of view capabilities.

[0070] As an optional implementation, in step S101, determining the field angle offset of the dual-channel coupling grating according to the field angle of the single-light engine includes:

[0071] If the field of view angle of the single-channel coupling grating is greater than the angular bandwidth of the first-channel coupling grating, the difference between the field of view angle of the single-channel coupling grating and the angular bandwidth of the first-channel coupling grating is used as the field of view angle offset of the dual-channel coupling grating, wherein the angular bandwidth of the first-channel coupling grating is the same as the angular bandwidth of the second-channel coupling grating.

[0072] Optionally, the angular bandwidth of the first-channel coupling grating is the same as the angular bandwidth of the second-channel coupling grating. If the field of view of the single-light machine is greater than the angular bandwidth of the first-channel coupling grating, the first-channel coupling grating and the second-channel coupling grating cannot couple all angles of light emitted by the single-light machine into the binocular optical waveguide. At this time, the field of view of the dual-channel coupling grating needs to be spliced ​​or expanded, and the difference between the field of view of the single-light machine and the angular bandwidth of the first-channel coupling grating is used as the field of view angle offset of the dual-channel coupling grating.

[0073] The field of view is expanded according to the field of view angle offset of the dual-channel coupled grating, so that the expanded field of view is not less than the field of view angle of the single-light machine. By expanding the field of view angle, all angles of light emitted by the single-light machine are coupled into the binocular-eye waveguide, thereby realizing a large field of view display of the binocular-eye waveguide.

[0074] Figure 4Schematic diagram of the field of view of a single optical machine and the angular bandwidth of a dual-channel coupled grating provided in an embodiment of the present application. Figure 4 For example, if the field of view of a single-channel optical machine is 40°, but the angular bandwidth of the first-channel coupling grating and the angular bandwidth of the second-channel coupling grating are both 30°, then the field of view angle offset of the dual-channel coupling grating is 10°.

[0075] It is worth noting that the method of field of view splicing and expansion can also be applied to large field of view display based on binocular waveguide of dual optical machine, and this application does not impose specific restrictions on this.

[0076] In this embodiment, when the field of view of the single-light engine is greater than the angular bandwidth of the first-channel coupling grating, the first-channel coupling grating and the second-channel coupling grating are unable to couple all angles of light emitted by the single-light engine into the binocular optical waveguide. The difference between the field of view of the single-light engine and the angular bandwidth of the first-channel coupling grating is used as the field of view angle offset of the dual-channel coupling grating. The field of view is expanded according to the field of view angle offset of the dual-channel coupling grating, ensuring that the expanded field of view is no less than that of the single-light engine. Through the field of view angle expansion, all angles of light emitted by the single-light engine are fully coupled into the binocular optical waveguide, achieving a large field of view display using the binocular optical waveguide.

[0077] As an optional implementation, in step S101, determining the field angle offset of the dual-channel coupling grating according to the field angle of the single-light engine includes:

[0078] If the field of view angle of the single-optical machine is less than or equal to the angular bandwidth of the first coupling grating, the field of view angle offset of the dual-channel coupling grating is determined to be zero, wherein the angular bandwidth of the first channel coupling grating is the same as the angular bandwidth of the second channel coupling grating.

[0079] Optionally, the angular bandwidth of the first-channel coupling grating is the same as the angular bandwidth of the second-channel coupling grating. If the field of view of the single-light machine is less than or equal to the angular bandwidth of the first-channel coupling grating, the first-channel coupling grating and the second-channel coupling grating can directly couple all angles of light emitted by the single-light machine into the binocular optical waveguide. At this time, there is no need to splice or expand the field of view of the dual-channel coupling grating, and the field of view angle offset of the dual-channel coupling grating is determined to be zero, that is, the field of view angle of the dual-channel coupling grating does not need to be offset, and a large field of view display of the binocular optical waveguide can be achieved.

[0080] Figure 5 This is a schematic diagram of the unexpanded field of view in the vector circle provided in the embodiment of the present application. Figure 5For example, the radius of the inner circle of the vector circle is 1, and the radius of the outer circle is n, where n is the refractive index of the holographic photosensitive material. The area within the inner circle represents air, and the area between the inner and outer circles represents the range of the total internal reflection angle of the holographic photosensitive material. When the field angle offset of the dual-channel coupled grating is zero, the field angle of the first channel in air and the field angle of the second channel in air are both 201, located at the center of the circle.

[0081] Specifically, refer to Figure 2 and Figure 5 The first channel's field of view 201 in air is diffracted by the first channel's input grating 101 and transmitted in the positive direction of the X-axis, entering the interior of the holographic photosensitive material and forming a field of view 211 within the holographic photosensitive material. Light with field of view 211 is deflected by the first channel's deflection grating 111 and reaches the first channel's output grating 121, forming an incident field of view 212 of the first channel's output grating 121. The light is then decoupled by the first channel's output grating 121 and returns to the first channel's field of view 201 in air, achieving field of view transmission for the first channel.

[0082] Correspondingly, the second channel's field of view 202 in air is diffracted by the second channel's input grating 102 and transmitted in the negative direction of the X-axis, entering the interior of the holographic photosensitive material and forming a field of view 221 within the holographic photosensitive material. Light with field of view 221 is deflected by the second channel's deflection grating 112 and reaches the second channel's output grating 122, forming an incident field of view 222 for the second channel's output grating 122. It is then decoupled by the second channel's output grating 122 and returned to the second channel's field of view 202 in air, achieving field of view transmission for the second channel. The first channel's field of view 201 in air and the second channel's field of view 201 in air completely overlap in the X-axis direction. Through the field of view transmission path of the first channel and the second channel, a binocular waveguide with a large field of view is achieved.

[0083] In this embodiment, when the field of view angle of the single-light machine is less than or equal to the angular bandwidth of the first-channel coupling grating, the field of view angle offset of the dual-channel coupling grating is cleared, and the first-channel coupling grating and the second-channel coupling grating directly couple all angles of light emitted by the single-light machine into the binocular optical waveguide, thereby realizing a large field of view display of the binocular optical waveguide.

[0084] Figure 6 Schematic diagram of the manufacturing process of the binocular waveguide provided in the embodiment of the present application Figure 2 ,like Figure 6 As shown, in the above step S102, the target number of light path exposures, the first exposure parameter of the dual-channel in-coupling grating, the second exposure parameter of the dual-channel in-coupling grating, and the exposure parameter of the dual-channel out-coupling grating are determined according to the field angle offset and the rotation angle of the signal light of the preset dual-channel turning grating, including:

[0085] S201 : Determine the field angle offset of the first channel coupling-in grating and the field angle offset of the second channel coupling-in grating according to the field angle offset.

[0086] Optionally, continue with reference to Figure 3 When the field angle offset of the dual-channel coupling grating is not zero, the field angle offset of the first channel coupling grating and the field angle offset of the second channel coupling grating are determined based on the field angle offset of the dual-channel coupling grating. The field angle offset of the first channel coupling grating is the displacement of the center of the field angle 301 of the first channel in air in the positive direction of the X-axis relative to the center of the circle; the field angle offset of the second channel coupling grating is the displacement of the center of the field angle 302 of the second channel in air in the negative direction of the X-axis relative to the center of the circle.

[0087] Continue to refer to Figure 5 When the field angle offset of the dual-channel coupling grating is zero, the field angle offset of the first channel coupling grating and the field angle offset of the second channel coupling grating are both zero. That is, the displacement of the center of the field angle 201 of the first channel in air relative to the center of the circle in the positive direction of the X-axis and the displacement of the center of the field angle 201 of the second channel in air relative to the center of the circle in the negative direction of the X-axis are both zero.

[0088] S202, determining the target number of light path exposures, the first exposure parameter, the second exposure parameter, and the third exposure parameter according to the field of view angle offset of the first channel coupling grating, the field of view angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating.

[0089] Optionally, based on the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating, the vector relationship between the gratings in the dual channels is analyzed, and the number of targets to be exposed in the optical path is determined based on the vector relationship between the gratings in the dual channels. The specific process of analyzing the vector relationship between the gratings in the dual channels and determining the number of targets to be exposed in the optical path will be explained in detail through the following embodiments.

[0090] Based on the angle between the reference light of the dual-channel input grating and the Z axis, as represented by the field angle offset of the dual-channel coupling grating, and the rotation angle of the signal light of the preset dual-channel deflection grating, and in combination with the equivalent exposure theory, first, second, and third exposure parameters are determined. The first exposure parameters include at least the reference light incident angle and the object light incident angle of the dual-channel input grating; the second exposure parameters include at least the reference light incident angle and the object light incident angle of the dual-channel deflection grating; and the third exposure parameters include at least the reference light incident angle and the object light incident angle of the dual-channel output grating.

[0091] In this embodiment, the field of view angle offsets of the first-channel coupling grating and the second-channel coupling grating are determined based on the field of view angle offset. The number of target exposures for the optical path, the first exposure parameter, the second exposure parameter, and the third exposure parameter are determined based on the field of view angle offsets of the first-channel coupling grating, the second-channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating. This improves the accuracy of the number of target exposures for the optical path and the exposure parameters of each dual-channel grating.

[0092] As an optional implementation, the step S201 above determines the field angle offset of the first channel coupling grating and the field angle offset of the second channel coupling grating according to the field angle offset, including:

[0093] The field angle offset of the dual-channel coupling grating is divided into the field angle offset of the first-channel coupling grating and the field angle offset of the second-channel coupling grating according to a preset ratio, wherein the field angle offset of the first-channel coupling grating is used to characterize the angle between the reference light of the first-channel coupling grating and the Z-axis, and the field angle offset of the second-channel coupling grating is used to characterize the angle between the reference light of the second-channel coupling grating and the Z-axis.

[0094] Optionally, when the field angle offset of the dual-channel coupling grating is not zero, the field angle offset of the dual-channel coupling grating is divided into a field angle offset of the first-channel coupling grating and a field angle offset of the second-channel coupling grating according to a preset ratio. The field angle offset of the first-channel coupling grating is used to represent the angle between the reference light of the first-channel coupling grating and the Z-axis, and the field angle offset of the second-channel coupling grating is used to represent the angle between the reference light of the second-channel coupling grating and the Z-axis.

[0095] Continue to refer to Figure 4 When the field angle offset of the dual-channel coupling grating is 10° and the preset ratio is 1:1, the field angle offset of the first-channel coupling grating can indicate that the angle between the reference light of the first-channel coupling grating and the Z axis is 5°, and the field angle offset of the second-channel coupling grating can indicate that the angle between the reference light of the second-channel coupling grating and the Z axis is also 5°. The preset ratio can also be other unequal ratios and is not specifically limited here.

[0096] When the field angle offset of the dual-channel coupling grating is zero, the field angle offset of the first-channel coupling grating and the field angle offset of the second-channel coupling grating are both zero, that is, the angle between the reference light of the first-channel coupling grating and the Z axis and the angle between the reference light of the second-channel coupling grating and the Z axis are both zero. In other words, the reference light of the first-channel coupling grating and the reference light of the second-channel coupling grating are both incident perpendicular to the Z axis.

[0097] In this embodiment, the field angle offset of the dual-channel coupling grating is divided into the field angle offset of the first-channel coupling grating and the field angle offset of the second-channel coupling grating according to a preset ratio. The field angle offset of the first-channel coupling grating is used to represent the angle between the reference light of the first-channel coupling grating and the Z-axis, and the field angle offset of the second-channel coupling grating is used to represent the angle between the reference light of the second-channel coupling grating and the Z-axis. This facilitates determining the incident angle of the reference light of the dual-channel coupling grating based on the field angle offset of the first-channel coupling grating and the field angle offset of the second-channel coupling grating.

[0098] As an optional embodiment, in step S202, determining the target number of light path exposures based on the field angle offset of the first-channel coupling grating, the field angle offset of the second-channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0099] When the field of view angle offset of the first-channel coupling-in grating is equal to the field of view angle offset of the second-channel coupling-in grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the number of targets exposed in the light path is determined to be two. When the difference in the Z-axis component between the dual-channel turning grating and the dual-channel coupling-in grating and the dual-channel coupling-out grating is ignored, the number of targets exposed in the light path is determined to be one.

[0100] Optionally, Figure 7 This is a schematic diagram of recording each grating when the field of view is expanded according to an embodiment of the present application, as shown in FIG. Figure 7 As shown, Figure 7 (a) is a schematic diagram of recording of a dual-channel coupled grating. Figure 7 (b) and Figure 7 (c) Schematic diagrams of recording of the second channel turning grating and the first channel turning grating. Figure 7 (a) Reference light coupled into the grating in the first channel The angle with the Z axis is α°, is the signal light coupled into the grating in the first channel, θ t is the total reflection angle of the total reflection transmission of the light in the binocular waveguide, assuming that the refractive index of the holographic photosensitive material and the waveguide substrate are both n, and the reference light coupled into the grating in the first channel is The signal light coupled into the grating in the first channel The expression is as follows:

[0101]

[0102] in, n is the refractive index and λ is the wavelength.

[0103] The grating vector of the first channel coupled into the grating is The expression is as follows:

[0104]

[0105] Reference Figure 7 (a) and Figure 7 (c) Reference light of the first channel turning grating The signal light coupled into the grating by the first channel The reference light of the first channel turning grating is obtained by reflection. The expression is as follows:

[0106]

[0107] Signal light of the first channel turning grating It is the reference light of the first channel turning grating The rotation matrix of the first angle of rotation around the Z axis is obtained by reflecting it from the waveguide base, where counterclockwise rotation is defined as positive and clockwise rotation is defined as negative. The rotation matrix of τ around the Z axis is expressed as:

[0108]

[0109] Then the first matrix after clockwise rotation is Expressed as:

[0110]

[0111] Then the signal light of the first channel turning grating after being reflected by the waveguide substrate Expressed as:

[0112]

[0113] Then the grating vector of the first channel transition grating is The expression is as follows:

[0114]

[0115] Since the first channel couples out the reference light of the grating The signal light of the first channel turning grating The reflected light of the first channel is coupled out of the grating signal light The reference light coupled into the grating in the first channel In the AR display scene, the Z-axis coordinate of the reflected light is opposite, so the reference light of the grating is coupled out of the first channel. and signal light The expression is as follows:

[0116]

[0117] Then the grating vector of the outcoupling grating of the first channel is The expression is as follows:

[0118]

[0119] Correspondingly, for the second channel, the reference light coupled into the grating by the second channel is The angle with the Z axis is also α°, The signal light coupled into the grating of the second channel and the reference light coupled into the grating of the second channel are The signal light coupled into the grating through the second channel The expression is as follows:

[0120]

[0121] Then the grating vector of the second channel coupled into the grating is The expression is as follows:

[0122]

[0123] Reference Figure 7 (a) and Figure 7 (b) Reference light of the second channel turning grating The signal light coupled into the grating by the second channel The reference light of the second channel turning grating is obtained by reflection. The expression is as follows:

[0124]

[0125] Signal light of the second channel turning grating It is the reference light of the second channel turning grating The first angle is rotated counterclockwise around the Z axis and then reflected by the waveguide base. The second matrix after counterclockwise rotation is Expressed as:

[0126]

[0127] Then the signal light of the second channel turning grating after being reflected by the waveguide substrate Expressed as:

[0128]

[0129] Then the grating vector of the second channel transition grating is The expression is as follows:

[0130]

[0131] Since the second channel couples out the reference light of the grating The signal light of the second channel turning grating The reflected light of the second channel is coupled out of the grating signal light The reference light coupled into the grating for the second channel In the AR display scene, the Z-axis coordinate of the reflected light is opposite, so the reference light of the grating is coupled out of the second channel. and signal light The expression is as follows:

[0132]

[0133] Then the grating vector of the outcoupling grating in the second channel is The expression is as follows:

[0134]

[0135] Among them, the first angle is 60°, then Figure 7 (c) Reference light of the first channel turning grating When rotating the first angle clockwise around the Z axis, the rotation angle τ2 = -60°, Figure 7 (b) Reference light of the second channel turning grating When the first angle is rotated counterclockwise around the Z axis, the rotation angle τ1 = 60°. Then the reference light coupled into the grating in the first channel is The angle with the Z axis and the reference light coupled into the grating in the second channel The angle with the Z axis is α°, and the reference light of the first channel turning grating The Z-axis rotation angle and the reference light of the second channel turning grating When the Z-axis rotation angles are -60° and 60° respectively, the relationship between the grating vectors of each grating in the dual channels is as follows:

[0136]

[0137] It can be seen that when the field angle offset of the first channel coupled grating is equal to the field angle offset of the second channel coupled grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the grating vector of the first channel coupled grating in the six dual-channel gratings is Grating vector of the outcoupling grating in the first channel Grating vector of the second channel coupled into the grating and the grating vector of the outcoupling grating of the second channel The four gratings with the same period, the first channel coupling grating, the second channel coupling grating, the first channel coupling grating and the second channel coupling grating, can be transformed into each other by rotation. Raster vector with the second channel transition raster The first channel turning grating and the second channel turning grating have the same period and can be transformed into each other by rotation. In this case, the target number of optical path exposures is determined to be two, that is, only two manufacturing systems are needed to realize the exposure of the six gratings in the dual channels of the entire binocular optical waveguide. Among them, one manufacturing system is used to manufacture the four gratings (first channel coupling grating, second channel coupling grating, first channel coupling grating, and second channel coupling grating), and the other manufacturing system is used to manufacture the first channel turning grating and the second channel turning grating.

[0138] Figure 8 This is a schematic diagram of recording each grating when the field of view is not expanded according to the embodiment of the present application. Figure 8 As shown, Figure 8 (a) is a schematic diagram of recording of a dual-channel coupled grating. Figure 8 (b) and Figure 8 (c) Schematic diagrams of recording the second channel turning grating and the first channel turning grating respectively. Figure 8 (a) The angles between the reference light coupled into the grating through the first channel and the Z axis and the angles between the reference light coupled into the grating through the second channel and the Z axis are both zero. The reference light coupled into the grating through the dual channels enters the grating surface perpendicular to the Z axis. The angles between the reference light coupled into the grating through the first channel and the reference light coupled into the grating through the second channel are both zero. is the signal light coupled into the grating in the first channel, θ t is the total reflection angle of the total reflection transmission of the light in the binocular waveguide, assuming that the refractive index of the holographic photosensitive material and the waveguide substrate are both n, and the reference light coupled into the grating in the first channel is The signal light coupled into the grating in the first channel The expression is as follows:

[0139]

[0140] in, n is the refractive index and λ is the wavelength.

[0141] The grating vector of the first channel coupled into the grating is The expression is as follows:

[0142]

[0143] Reference Figure 8 (a) and Figure 8 (c) Reference light of the first channel turning grating The signal light coupled into the grating by the first channel The reference light of the first channel turning grating is obtained by reflection. The expression is as follows:

[0144]

[0145] Signal light of the first channel turning grating It is the reference light of the first channel turning grating The rotation matrix of the first angle of rotation around the Z axis is obtained by reflecting it from the waveguide base, where counterclockwise rotation is defined as positive and clockwise rotation is defined as negative. The rotation matrix of τ around the Z axis is expressed as:

[0146]

[0147] Then the third matrix after clockwise rotation is Expressed as:

[0148]

[0149] Then the signal light of the first channel turning grating after being reflected by the waveguide substrate Expressed as:

[0150]

[0151] Then the grating vector of the first channel transition grating is The expression is as follows:

[0152]

[0153] Since the first channel couples out the reference light of the grating The signal light of the first channel turning grating The reflected light of the first channel is coupled out of the grating signal light The reference light coupled into the grating in the first channel In the AR display scene, the Z-axis coordinate of the reflected light is opposite, so the reference light of the grating is coupled out of the first channel. and signal light The expression is as follows:

[0154]

[0155] Then the grating vector of the first channel outcoupling grating is The expression is as follows:

[0156]

[0157] Correspondingly, for the second channel, the reference light coupled into the grating is The signal light coupled into the grating in the second channel is the signal light coupled into the grating in the second channel. The expression is as follows:

[0158]

[0159] Then the grating vector of the second channel coupled into the grating is The expression is as follows:

[0160]

[0161] Reference Figure 8 (a) and Figure 8 (b) Reference light of the second channel turning grating The signal light coupled into the grating by the second channel The reference light of the second channel turning grating is obtained by reflection. The expression is as follows:

[0162]

[0163] Signal light of the second channel turning grating It is the reference light of the second channel turning grating The fourth matrix after counterclockwise rotation is obtained by rotating the first angle counterclockwise around the Z axis and then reflecting it through the waveguide base. Expressed as:

[0164]

[0165] Then the signal light of the second channel turning grating after being reflected by the waveguide substrate Expressed as:

[0166]

[0167] Then the grating vector of the second channel transition grating is The expression is as follows:

[0168]

[0169] Since the second channel couples out the reference light of the grating The signal light of the second channel turning grating The reflected light of the second channel is coupled out of the grating signal light The reference light coupled into the grating for the second channel In the AR display scene, the Z-axis coordinate of the reflected light is opposite, so the reference light of the grating is coupled out of the second channel. and signal light The expression is as follows:

[0170]

[0171] Then the grating vector of the outcoupling grating in the second channel is The expression is as follows:

[0172]

[0173] Among them, the first angle is 60°, then Figure 8 (c) Reference light of the first channel turning grating When rotating the first angle clockwise around the Z axis, the rotation angle τ2 = -60°, Figure 8 (b) Reference light of the second channel turning grating When the first angle is rotated counterclockwise around the Z axis, the rotation angle τ1 = 60°. Then the reference light coupled into the grating in the first channel is The angle with the Z axis and the reference light coupled into the grating in the second channel The angle with the Z axis is zero, and the reference light of the first channel turning grating The Z-axis rotation angle and the reference light of the second channel turning grating When the Z-axis rotation angles are -60° and 60° respectively, the relationship between the grating vectors of each grating in the dual channels is as follows:

[0174]

[0175] It can be seen that when there is no field angle offset of the first channel coupling grating and the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the grating vector of the first channel coupling grating in the six gratings of the dual channel is Grating vector of the outcoupling grating in the first channel Grating vector of the second channel coupled into the grating and the grating vector of the outcoupling grating of the second channel The four gratings with the same period, the first channel coupling grating, the second channel coupling grating, the first channel coupling grating and the second channel coupling grating, can be transformed into each other by rotation. Raster vector with the second channel transition raster The first channel turning grating and the second channel turning grating have the same period and can be transformed into each other by rotation. In this case, the target number of optical path exposures is determined to be two, that is, only two manufacturing systems are needed to realize the exposure of the six gratings in the dual channels of the entire binocular optical waveguide. Among them, one manufacturing system is used to manufacture the four gratings (first channel coupling grating, second channel coupling grating, first channel coupling grating, and second channel coupling grating), and the other manufacturing system is used to manufacture the first channel turning grating and the second channel turning grating.

[0176] It is worth noting that, referring to Figure 3 and Figure 5The vector circle of the dual-channel six-piece grating forms two equilateral triangles of the same size in the kxky plane. That is, the grating vector of the first-channel coupling-in grating, the grating vector of the first-channel coupling-out grating, the grating vector of the second-channel coupling-in grating, the grating vector of the second-channel coupling-out grating, the grating vector of the first-channel turning grating and the grating vector of the second-channel turning grating in the dual-channel six-piece grating have the same length in the kxky plane. The six-piece grating of the dual-channel has the same surface period. The surface period affects the diffraction direction of the incident light by the grating, and the kz component affects the angle corresponding to the peak of the diffraction efficiency. If the influence of the difference in the kz components of the dual-channel coupling-in grating, the dual-channel coupling-out grating and the dual-channel turning grating is ignored, the same manufacturing system can be used to realize the manufacturing of the dual-channel six-piece grating, further improving the efficiency and convenience of the automated production of the dual-channel six-piece grating.

[0177] To maximize the incoupling efficiency, the manufacturing system can use the exposure parameters of a dual-channel incoupling grating. In the binocular waveguide, to ensure uniform light outcoupling, the dual-channel turning grating and the dual-channel outcoupling grating do not require excessively high diffraction efficiencies. Therefore, the difference in the kz component of the dual-channel incoupling grating, outcoupling grating, and turning grating on the kz axis can be ignored.

[0178] In this embodiment, when the field of view angle offset of the first-channel input grating is equal to the field of view angle offset of the second-channel input grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the dual channels are symmetrical, and the input grating in each channel is equivalent to the output grating, then the target number of optical path exposures is determined to be two, and the first manufacturing system is used to manufacture four gratings: the first-channel input grating, the second-channel input grating, the first-channel output grating, and the second-channel output grating, and the second manufacturing system is used to manufacture the first-channel turning grating and the second-channel turning grating. When ignoring the difference in the kz component of the dual-channel input grating, the output grating, and the turning grating on the kz axis, the target number of optical path exposures is determined to be one, and the first manufacturing system is used to manufacture six gratings: the first-channel input grating, the second-channel input grating, the first-channel output grating, the second-channel output grating, the first-channel turning grating, and the second-channel turning grating, thereby further improving the efficiency and convenience of the automated production of the six dual-channel gratings and realizing the automated and efficient production of binocular optical waveguides.

[0179] As an optional embodiment, in step S202, determining the target number of light path exposures based on the field angle offset of the first-channel coupling grating, the field angle offset of the second-channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0180] When the viewing angle offset of the first channel coupling grating is equal to the viewing angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the target number of the light path exposure is determined to be two.

[0181] Optionally, continue with reference to Figure 7 and Figure 8 When the field angle offset of the coupling grating in the first channel is equal to the field angle offset of the coupling grating in the second channel, the two channels are symmetrical. However, since the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the surface period of the turning grating in each channel is not equal to that of the coupling grating and the coupling grating, the target number of the optical path exposure is determined to be two.

[0182] Specifically, the first manufacturing system is used to manufacture the first channel coupling-in grating, the second channel coupling-in grating, the first channel coupling-out grating and the second channel coupling-out grating; the second manufacturing system is used to manufacture the first channel turning grating and the second channel turning grating; and the automated and efficient production of binocular optical waveguide is realized.

[0183] In this embodiment, when the field of view angle offset of the first-channel input grating is equal to that of the second-channel input grating, and the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the dual channels are symmetrical, and the surface period of the turning grating in each channel is not equal to that of the input grating and the output grating, the target number of optical path exposures is determined to be two. The first manufacturing system is used to manufacture the first-channel input grating, the second-channel input grating, the first-channel output grating, and the second-channel output grating; the second manufacturing system is used to manufacture the first-channel turning grating and the second-channel turning grating. This achieves automated and efficient production of binocular optical waveguides.

[0184] As an optional embodiment, in step S202, determining the target number of light path exposures based on the field angle offset of the first-channel coupling grating, the field angle offset of the second-channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes:

[0185] When the field angle offset of the first channel coupling-in grating is not equal to the field angle offset of the second channel coupling-in grating, the target number of the light path exposure is determined to be four.

[0186] Optionally, continue with reference to Figure 7 and Figure 8 When the field angle offset of the coupling-in grating of the first channel is not equal to the field angle offset of the coupling-in grating of the second channel, the dual channels are asymmetric, and since the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the surface period of the turning grating in each channel is not equal to the surface period of the coupling-in grating and the coupling-out grating, the target number of the optical path exposure is determined to be four.

[0187] Specifically, the first manufacturing system is used to manufacture the first-channel in-coupling grating and the first-channel out-coupling grating; the second manufacturing system is used to manufacture the second-channel in-coupling grating and the second-channel out-coupling grating; the third manufacturing system is used to manufacture the first-channel turning grating; and the fourth manufacturing system is used to manufacture the second-channel turning grating. This enables the automated and flexible production of binocular optical waveguides.

[0188] In this embodiment, when the field angle offset of the first-channel input grating is not equal to the field angle offset of the second-channel input grating, and the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the dual channels are asymmetric, and the surface period of the turning grating in each channel is not equal to the surface period of the input grating and the output grating, the target number of optical path exposures is determined to be four. The first manufacturing system is used to manufacture the first-channel input grating and the first-channel output grating; the second manufacturing system is used to manufacture the second-channel input grating and the second-channel output grating; the third manufacturing system is used to manufacture the first-channel turning grating; and the fourth manufacturing system is used to manufacture the second-channel turning grating. This achieves automated and flexible production of binocular optical waveguides.

[0189] Figure 9 A schematic diagram of a process for realizing binocular display using a binocular waveguide based on a single optical machine according to an embodiment of the present application is provided. Figure 9 As shown, after obtaining the binocular eye waveguide in the above step S104, the following steps are included:

[0190] S301: A first channel coupling-in grating, a first channel turning grating, and a first channel coupling-out grating couple a first portion of light emitted by a single optical engine out to a first region through a first channel.

[0191] Optionally, continue with reference to Figure 2 Since the first channel coupling-in grating 101 and the second channel coupling-in grating 102 are completely overlapped and attached to the waveguide substrate 100, a portion of the light emitted by the single-light machine is coupled into the binocular-eye waveguide by the first channel coupling-in grating 101, and propagates toward the positive direction of the X-axis in the binocular-eye waveguide in the form of total reflection. After reaching the first channel turning grating 111, the light is deflected at a certain angle to the X-axis, propagates along the positive direction of the X-axis and the negative direction of the Y-axis, reaches the first channel coupling-out grating 121, and is coupled out to the first region through the first channel coupling-out grating 121.

[0192] For example, in an AR display scenario, the first area may be the user's left eye.

[0193] S302: The second channel coupling-in grating, the second channel turning grating and the second channel coupling-out grating couple the second portion of light emitted by the single optical engine out to the second region through the second channel.

[0194] Optionally, continue with reference to Figure 2Another part of the light emitted by the single-light machine is coupled into the binocular-optical waveguide by the second-channel coupling-in grating 102, and propagates toward the negative direction of the X-axis in the binocular-optical waveguide in the form of total reflection. After reaching the second-channel turning grating 121, the light is deflected at a certain angle to the X-axis, propagates along the negative direction of the X-axis and the negative direction of the Y-axis, reaches the second-channel coupling-out grating 122, and is coupled out to the second area through the second-channel coupling-out grating 122.

[0195] For example, in an AR display scenario, the second area may be the user's right eye.

[0196] In this embodiment, the first-channel input grating, the first-channel turning grating, and the first-channel output grating couple the first portion of light emitted by the single-channel optical engine to the first region through the first channel. The second-channel input grating, the second-channel turning grating, and the second-channel output grating couple the second portion of light emitted by the single-channel optical engine to the second region through the second channel. By coupling the light emitted by the single-channel optical engine to two regions through two channels, a binocular display effect based on a binocular waveguide is achieved.

[0197] An embodiment of the present application further provides a binocular-optical waveguide, comprising a waveguide substrate and a dual-channel in-coupling grating, a dual-channel turning grating, and a dual-channel out-coupling grating located at corresponding positions on the waveguide substrate, wherein the first channel in-coupling grating and the second channel in-coupling grating of the dual-channel in-coupling grating overlap and are bonded to the waveguide substrate.

[0198] Technicians in the relevant field can clearly understand that volume holographic materials can be multiplexed and exposed, which means that after the first channel coupling grating is manufactured, the holographic film can be rotated 180° and the second channel coupling grating can be exposed in the corresponding optical path, thereby realizing the manufacture of two coupling gratings on the same layer of material, avoiding the defects caused by overlapping bonding.

[0199] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the protection scope of the present application.

Claims

1. A method for manufacturing a binocular waveguide, characterized in that: include: Determine the field angle offset of the dual-channel coupled grating according to the field angle of the single-optical machine; Determining, based on the field of view angle offset and the rotation angle of the signal light of the preset dual-channel deflection grating, the target number of light path exposures, the first exposure parameter of the dual-channel in-coupling grating, the second exposure parameter of the dual-channel deflection grating, and the third exposure parameter of the dual-channel out-coupling grating, wherein the reference light incident angle in the first exposure parameter is used to expand the field of view angle of the dual-channel in-coupling grating, and the expanded field of view angle is greater than or equal to the field of view angle of the single-light machine; Determining the target number of manufacturing systems, and determining manufacturing parameters of each of the manufacturing systems based on the first exposure parameter, the second exposure parameter, and the third exposure parameter, the manufacturing parameters including at least a signal light incident angle and a reference light incident angle; The binocular optical waveguide is obtained by laminating the dual-channel in-coupling grating, the dual-channel turning grating and the dual-channel out-coupling grating on the waveguide substrate through various manufacturing systems, wherein the first channel in-coupling grating and the second channel in-coupling grating of the dual-channel in-coupling grating are overlapped and laminarized on the waveguide substrate.

2. The method according to claim 1, characterized in that Determining the field angle offset of the dual-channel coupling grating according to the field angle of the single optical machine includes: If the field of view angle of the single-channel coupling grating is greater than the angular bandwidth of the first-channel coupling grating, the difference between the field of view angle of the single-channel coupling grating and the angular bandwidth of the first-channel coupling grating is used as the field of view angle offset of the dual-channel coupling grating, wherein the angular bandwidth of the first-channel coupling grating is the same as the angular bandwidth of the second-channel coupling grating.

3. The method according to claim 1, characterized in that Determining the field angle offset of the coupling-in grating according to the field angle of the single-lens machine includes: If the field of view angle of the single optical machine is less than or equal to the angular bandwidth of the first coupling grating, the field of view angle offset of the dual-channel coupling grating is determined to be zero, wherein the angular bandwidth of the first channel coupling grating is the same as the angular bandwidth of the second channel coupling grating.

4. The method according to claim 1, wherein The method of determining the target number of light path exposures, the first exposure parameter of the dual-channel in-coupling grating, the second exposure parameter of the dual-channel in-coupling grating, and the exposure parameter of the dual-channel out-coupling grating according to the field of view angle offset and the rotation angle of the signal light of the preset dual-channel turning grating includes: Determining the field angle offset of the first channel coupling-in grating and the field angle offset of the second channel coupling-in grating according to the field angle offset; The target number of the optical path exposure, the first exposure parameter, the second exposure parameter and the third exposure parameter are determined according to the field of view angle offset of the first channel coupling grating, the field of view angle offset of the second channel coupling grating and the rotation angle of the signal light of the dual-channel turning grating.

5. The method according to claim 4, characterized in that Determining the field angle offset of the first channel coupling grating and the field angle offset of the second channel coupling grating according to the field angle offset includes: The field of view angle offset of the dual-channel coupling grating is divided into the field of view angle offset of the first-channel coupling grating and the field of view angle offset of the second-channel coupling grating according to a preset ratio, wherein the field of view angle offset of the first-channel coupling grating is used to characterize the angle between the reference light of the first-channel coupling grating and the Z-axis, and the field of view angle offset of the second-channel coupling grating is used to characterize the angle between the reference light of the second-channel coupling grating and the Z-axis.

6. The method according to claim 5, characterized in that Determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes: When the field of view angle offset of the first-channel coupling-in grating is equal to the field of view angle offset of the second-channel coupling-in grating, and the rotation angle of the signal light of the dual-channel turning grating is the first angle, the target number of the light path exposure is determined to be two. When the difference in the Z-axis component between the dual-channel turning grating and the dual-channel coupling-in grating and the dual-channel coupling-out grating is ignored, the target number of the light path exposure is determined to be one.

7. The method according to claim 5, characterized in that Determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes: When the field angle offset of the first channel coupling grating is equal to the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating is not the first angle, the target number of the light path exposure is determined to be two.

8. The method according to claim 5, characterized in that Determining the target number of the light path exposure according to the field angle offset of the first channel coupling grating, the field angle offset of the second channel coupling grating, and the rotation angle of the signal light of the dual-channel turning grating includes: When the field angle offset of the first channel coupling-in grating is not equal to the field angle offset of the second channel coupling-in grating, the target number of the light path exposure is determined to be four.

9. The method according to claim 1, characterized in that After obtaining the binocular optical waveguide, the method includes: The first channel coupling-in grating, the first channel turning grating and the first channel coupling-out grating couple the first portion of light emitted by the single optical machine out to the first region through the first channel; The second channel coupling-in grating, the second channel turning grating and the second channel coupling-out grating couple the second portion of light emitted by the single optical engine out to the second region through the second channel.

10. A binocular waveguide, characterized in that The binocular optical waveguide includes a waveguide substrate and a dual-channel in-coupling grating, a dual-channel turning grating and a dual-channel out-coupling grating located at corresponding positions of the waveguide substrate, wherein the first channel in-coupling grating and the second channel in-coupling grating of the dual-channel in-coupling grating are overlapped and attached to the waveguide substrate.

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