Binocular ar diffractive light waveguide display module

Abstract

The application relates to a binocular AR diffractive light waveguide display module, which comprises left eye lenses, right eye lenses and a projection light machine, the left eye lenses and the right eye lenses are independent split structures, the left eye lenses and the right eye lenses are respectively provided with input diffractive optical elements and output diffractive optical elements, the projection light machine is arranged between the left eye lenses and the right eye lenses and located at the opposite side of human eyes, image light emitted by the projection light machine is coupled into the left eye lenses and the right eye lenses through the input diffractive optical elements respectively, and is coupled out to human eyes from the output diffractive optical elements after total reflection. The application has the advantages of high image stability, high optical design freedom, high structural strength and good wearing comfort.

Description

Technical Field

[0001] This invention relates to the technical field of diffractive waveguides, and in particular to a binocular AR diffractive waveguide display module. Background Technology

[0002] Augmented Reality (AR) technology enables the fusion of virtual information with real-world scenes, providing users with an immersive interactive experience. Diffractive waveguides, with their advantages of small size, light weight, high optical transmittance, and wide eye movement range, have become one of the mainstream technologies in near-eye AR displays. To achieve binocular display functionality, existing AR diffractive waveguide modules mainly employ two types of architectures: The first architecture uses two independent optical engines and waveguide sheets, providing display images for the left and right eyes respectively. This architecture suffers from high hardware costs, large overall module size, and poor binocular image merging stability. The second architecture is a single-optical-engine split-path scheme (one-to-two scheme), using a single integrated diffractive waveguide substrate. A single projection optical engine inputs image light, which is split into left and right paths by a beam splitter grating inside the waveguide substrate. The two paths are coupled out through the corresponding exit pupil gratings and then enter the human eye.

[0003] Chinese Patent Publication No. CN116482861A discloses a binocular waveguide, including a substrate, an entrance pupil grating disposed on the substrate, and a first and second pupil dilators asymmetrically disposed on opposite sides of the entrance pupil grating. The first and second pupil dilators are respectively disposed on the light-emitting sides of the first and second pupil dilators as a first and a second exit pupil grating. Input image light is incident on the entrance pupil grating at an incident angle deviating from the perpendicular line of the substrate and is diffracted by the entrance pupil grating into a first and a second guided light. The first guided light is dilated by the first pupil dilator and coupled out by the first exit pupil grating as a first output light. The second guided light is dilated by the second pupil dilator and coupled out by the second exit pupil grating as a second output light. The first and second output lights are used to be incident on the binoculars respectively, wherein the first image formed by the first output light and the second image formed by the second output light coincide at infinity.

[0004] Chinese Patent CN216411745U discloses a binocular AR imaging device, including a first waveguide plate, a second waveguide plate, and a beam splitting imaging system. The first and second waveguide plates couple incoming light rays to the human eye. The beam splitting imaging system includes a display source module, a beam splitting module, and an imaging module. The display source module generates imaging rays to form a virtual image. The beam splitting module reflects the imaging rays emitted by the display source module to the imaging module. The imaging module magnifies the virtual image formed by the display source module and simultaneously forms multiple parallel rays that are collimated and directed into the first and second waveguide plates. Alternatively, the display source module generates imaging rays to form a virtual image, the imaging module magnifies the virtual image formed by the display source module, and the beam splitting module forms multiple parallel rays based on the magnified virtual image and collimates them into the first and second waveguide plates.

[0005] The existing technical solutions described above have the following drawbacks:

[0006] 1) For the "one-to-two" monolithic diffractive waveguide solution, the left and right eyepieces share a single substrate and are integrally molded, which makes it impossible to form a mirror angle between the left and right eyepieces that is adapted to the wearing habits of the human eye, resulting in poor wearing comfort and aesthetics. At the same time, due to the structural limitation of the shared substrate between the left and right eyepieces, the coupling area is a monolithic structure. In order to ensure the symmetry of the light intensity of the left and right eyepieces, the grating vector of the coupling grating can only be distributed in the horizontal direction. This constraint limits the freedom of optical design, and the theoretical upper limit of the positive first-order diffraction efficiency of monocular coupling is 50%, which makes it difficult to effectively improve the overall light utilization rate. For full-color waveguides, the improvement of their optical performance is significantly restricted.

[0007] 2) To meet aesthetic requirements, the bridge area of ​​a one-piece lens substrate is typically designed with a thinner structure. However, this area needs to support or be adjacent to the optical engine components, resulting in insufficient structural strength. This makes it prone to breakage during manufacturing and actual use, leading to poor product reliability. To compensate for this structural weakness, the final product usually requires additional thick-walled metal structural components, ultimately resulting in excessive overall weight.

[0008] 3) For binocular imaging architecture using beam splitters and other solutions, this design introduces too many optical structural components, resulting in complex module processing and high manufacturing costs; moreover, the optical engine and human eye are arranged on the same side, making it difficult to achieve imaging, and even a slight offset of the structural components can cause imaging deviation, making it difficult to guarantee the system's imaging stability. Summary of the Invention

[0009] The problem to be solved by the present invention is to provide a binocular AR diffractive waveguide display module that addresses the above-mentioned shortcomings of the prior art. It has the advantages of high image stability, high degree of freedom in optical design, high structural strength and good wearing comfort.

[0010] The above-mentioned objective of this invention is achieved through the following technical solutions:

[0011] A binocular AR diffractive waveguide display module includes a left eye lens, a right eye lens, and a projection optical engine. The left and right eye lenses are independent separate structures, each having an input diffractive optical element and an output diffractive optical element. The projection optical engine is arranged between the left and right eye lenses and located on the opposite side of the human eye. The image light emitted by the projection optical engine is coupled into the left and right eye lenses through the input diffractive optical elements, and after total internal reflection, is coupled out from the output diffractive optical element to the human eye.

[0012] Furthermore, the angle between the left and right eyepieces is adjustable.

[0013] Furthermore, the included angle between the left and right eyepieces is 170~176°.

[0014] Furthermore, the input diffractive optical elements on the left and right eyepieces are arranged adjacent to each other, and the adjacent sidewalls are provided with light-absorbing coatings.

[0015] Furthermore, the input diffraction optical elements on the left and right eyepieces are each independently configured as coupling gratings with asymmetric subwavelength structures. The asymmetric subwavelength structure of the coupling grating is not limited to, for example, a blazed grating, a tilted grating, or a combination of at least two of a straight grating, a blazed grating, and a tilted grating; that is, the subwavelength structure is not mirror-symmetric in a plane approximately perpendicular to the light transmission direction.

[0016] Furthermore, the output diffraction optical elements on the left and right eyepieces are each independently configured as a two-dimensional coupling grating, or a one-dimensional folding grating and a one-dimensional coupling grating.

[0017] Furthermore, the projection optical engine is configured as a single-screen, single-lens projection optical engine. This single-screen, single-lens projection optical engine includes a single display chip and a single lens composed of multiple lenses sharing a single optical axis. The display chip is a MicroLED display, an LCOS display, or a DLP display.

[0018] Furthermore, the specific implementation of the left and right eye lenses is as follows: First, a high-refractive-index glass substrate is prepared, and nanoimprinting is performed on the structural region of the glass substrate to obtain two sets of symmetrically arranged input diffractive optical elements and output diffractive optical elements. Then, an optical functional thin film is deposited on the structural region of the glass substrate. Next, the glass substrate is cut and separated along the central axis of the structural region, and a light-absorbing coating is formed on the cut sidewall near the input diffractive optical elements. Finally, a protective cover plate is superimposed on at least one side of the structural region to obtain the left and right eye lenses.

[0019] Furthermore, the refractive index of the glass substrate is 1.7~2.0, and the refractive index of the nanoimprint material is 1.7~2.0.

[0020] Furthermore, the cutting and separation is performed using laser cutting or CNC cutting.

[0021] Furthermore, the light-absorbing coating is applied to the entire sidewall using a light-shielding adhesive or ink, and the light-shielding adhesive or ink does not overflow onto the mirror area of ​​the glass substrate.

[0022] Furthermore, the protective cover is made of optical glass or optical resin, and the cover is laminated by frame bonding or full bonding.

[0023] In summary, the beneficial technical effects of the present invention are as follows:

[0024] 1. This invention sets the left and right eyepieces as independent separate structures and places the projection optical engine on the opposite side of the human eye. According to the principle of rectilinear propagation of light, no matter how the angle between the left and right eyepieces is adjusted, the binocular image-combining distance can be stably maintained at infinity. This solves the image-combining deviation problem caused by structural component offset in the traditional "one-to-two" solution and significantly improves the image-combining stability of the display module.

[0025] 2. Since the left and right eyepieces are independent of each other and each is equipped with an independent input diffraction optical element, the coupling gratings of the left and right eyepieces can be designed independently. This breaks the design limitation that the coupling grating vector must be horizontally distributed in the traditional integrated solution. Asymmetric subwavelength structures (such as blazed gratings) can be introduced, enabling the monocular coupling positive first-order diffraction efficiency to exceed the theoretical upper limit of 50%, significantly improving the overall optical efficiency of the diffraction waveguide, and is of great value for optimizing the optical performance of full-color waveguides.

[0026] 3. The split structure proposed in this invention eliminates the stress concentration phenomenon in the nose bridge area of ​​traditional one-piece lenses, effectively reducing the risk of lens breakage during production and use, and improving the reliability and durability of the product; at the same time, the angle between the left and right lenses can be adjusted according to the wearing habits of the human eye, effectively improving wearing comfort and aesthetic appearance.

[0027] 4. In this invention, the input diffraction optical elements of the left and right eye lenses are arranged in a close proximity scheme, and a light-absorbing coating is provided on the sidewalls, which can effectively suppress stray light crosstalk between the left and right eyes and ensure imaging quality. At the same time, the manufacturing process of this invention is based on existing mature processes. By first preparing an integral lens and then cutting and separating it along the central axis to obtain a split structure, it takes into account both high performance and low cost mass production requirements. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the binocular AR diffraction waveguide display module according to Embodiment 1 of the present invention.

[0029] Figure 2 This is a schematic diagram showing the connection relationship between the input diffractive optical element, the left eye lens, and the right eye lens in Embodiment 2 of the present invention.

[0030] Figure 3 This is a schematic diagram showing the connection relationship between the input diffractive optical element, the output diffractive optical element, the left eye lens, and the right eye lens in Embodiment 3 of the present invention.

[0031] Figure 4 This is a schematic diagram showing the connection relationship between the input diffractive optical element, the output diffractive optical element, the left eye lens, and the right eye lens in Embodiment 4 of the present invention.

[0032] Figure 5 This is a schematic diagram of the structure of one of the projection optical engines in Embodiment 5 of the present invention.

[0033] Figure 6 This is a schematic diagram of another projection optical engine in Embodiment 5 of the present invention.

[0034] Figure 7 This is a red light coupling efficiency distribution diagram of the binocular AR diffraction waveguide display module of Embodiment 2 and Comparative Example 1 of the present invention.

[0035] Figure 8 This is a green light coupling efficiency distribution diagram of the binocular AR diffraction waveguide display module of Embodiment 2 and Comparative Example 1 of the present invention.

[0036] Figure 9 This is a blue light coupling efficiency distribution diagram of the binocular AR diffraction waveguide display module of Embodiment 2 and Comparative Example 1 of the present invention.

[0037] In the diagram, 1 is the left eyepiece; 2 is the right eyepiece; 3 is the projection optical engine; 4 is the input diffractive optical element; 5 is the output diffractive optical element; and 6 is the light-absorbing coating. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1: Refer to Figure 1 This invention discloses a binocular AR diffractive waveguide display module, comprising a left eyepiece 1, a right eyepiece 2, and a projection optical engine 3. The left eyepiece 1 and right eyepiece 2 are independent, separate structures with an adjustable angle (preferably 172° in this embodiment). Each of the left and right eyepieces has an input diffractive optical element 4 and an output diffractive optical element 5. The input diffractive optical elements 4 on the left and right eyepieces 1 and 2 are arranged adjacent to each other, and their adjacent sidewalls are provided with a light-absorbing coating 6. The projection optical engine 3 is positioned between the left and right eyepieces 1 and 2, opposite to the viewer's eye. The image light emitted by the projection optical engine 3 is coupled into the left and right eyepieces 1 and 2 via the input diffractive optical elements 4, and after total internal reflection, is coupled out through the output diffractive optical element 5 to the viewer's eye.

[0040] Example 2: Refer to Figure 2 This invention discloses a binocular AR diffractive waveguide display module, which differs from Embodiment 1 in that the input diffractive optical elements 4 on the left eye lens 1 and the right eye lens 2 are each independently configured as coupling gratings with asymmetric subwavelength structures. In this embodiment, the asymmetric subwavelength structure of the coupling grating is preferably a blazed grating, and the grating material is controlled to be titanium dioxide, the grating period is 360nm, the grating height is 130nm, the duty cycle is 60%, the blaze angle is 25°, and the anti-blaze angle is 87°.

[0041] Example 3: Reference Figure 3 This invention discloses a binocular AR diffractive waveguide display module, which differs from Embodiment 2 in that the output diffractive optical elements 5 on the left eye lens 1 and the right eye lens 2 are each independently set as two-dimensional coupling gratings.

[0042] Example 4: Reference Figure 4 This invention discloses a binocular AR diffractive waveguide display module, which differs from Embodiment 2 in that the output diffractive optical elements 5 on the left eye lens 1 and the right eye lens 2 are each independently configured as a one-dimensional turning grating and a one-dimensional coupling grating.

[0043] Example 5: Refer to Figure 5 and Figure 6This invention discloses a binocular AR diffractive waveguide display module, which differs from embodiments 3 or 4 in that the projection optical engine 3 is configured as a single-screen, single-lens projection optical engine 3. The single-screen, single-lens projection optical engine 3 includes a single display chip and a single lens composed of multiple lenses sharing a single optical axis. The display chip is a MicroLED display, an LCOS display, or a DLP display. (See reference...) Figure 5 A single-lens camera is a lens in which all lenses share a common optical axis. Light exiting the left and right eye pupils is incident on the input diffraction optical elements 4 on the left eye lens 1 and right eye lens 2, respectively. The shape of these elements varies depending on the specific shape of the light coupling, with common shapes including circles and rectangles. (See reference...) Figure 6 In addition, lenses also include those with a reversible optical path. Any lens that shares a single optical axis that does not split the light falls within the scope of this invention.

[0044] Example 6: This invention discloses a binocular AR diffractive waveguide display module. The difference from Examples 3 or 4 lies in the implementation of the left eyepiece 1 and right eyepiece 2. First, a glass substrate with a refractive index of 2.0 is prepared. The structural region of the glass substrate undergoes nanoimprinting treatment. The refractive index of the nanoimprinting material is 2.0, resulting in two symmetrically arranged sets of input diffractive optical elements 4 and output diffractive optical elements 5. Then, an optical functional thin film is deposited in the structural region of the glass substrate. Next, the glass substrate is cut and separated along the central axis of the structural region using laser cutting or CNC cutting. A light-absorbing coating 6 is formed on the cut sidewalls near the input diffractive optical elements 4. The light-absorbing coating 6 is applied to the sidewalls using light-shielding adhesive or ink, ensuring that the adhesive or ink does not overflow into the mirror area of ​​the glass substrate. Finally, a protective cover plate is stacked on at least one side of the structural region's mirror surface. The protective cover plate is made of optical glass or optical resin, and the stacking method is frame bonding or full bonding, resulting in the left eyepiece 1 and right eyepiece 2.

[0045] Comparative Example 1: This invention discloses a binocular AR diffractive waveguide display module. The difference from Example 2 is that the left eye lens 1 and the right eye lens 2 are integrally formed and arranged, and the input diffractive optical element 4 on the left eye lens 1 and the right eye lens 2 is set as a coupling grating with a symmetrical subwavelength structure. In this embodiment, the symmetrical subwavelength structure of the coupling grating is preferably a straight grating, and the grating material is controlled to be titanium dioxide, the grating period is 360nm, the grating height is 50nm, and the duty cycle is 60%.

[0046] Experimental Example 1: The Influence of Different Coupled-in Grating Structures on Optical Coupling Efficiency

[0047] Using the binocular AR diffractive waveguide display modules prepared in Example 2 and Comparative Example 1, and employing the same projection optical engine 3 (output power P), under the same environmental conditions, the coupled optical power of each module was measured under red light (wavelength approximately 635 nm), green light (wavelength approximately 520 nm), and blue light (wavelength approximately 460 nm), and the coupling efficiency at each wavelength was calculated (coupling efficiency = coupled optical power / input optical power P × 100%). The results are as follows. Figures 7-9 As shown.

[0048] from Figures 7-9 As can be seen, Comparative Example 1, which uses a symmetrical straight grating, has low coupling efficiency across all wavelength bands, with a blue light efficiency of only 31.2% and an average efficiency of 37.4%. In contrast, Example 2 shows significantly higher coupling efficiencies for red, green, and blue light compared to Example 1, with the average coupling efficiency increasing from 37.4% to 66.5%, a relative improvement of approximately 78%. The blue light efficiency, in particular, increases from 31.2% to 72.3%, representing the most significant improvement. These results demonstrate that this invention, by separating the coupling segments and introducing an asymmetric subwavelength grating structure, effectively breaks the limitation of coupling efficiency not exceeding 50% in traditional solutions, significantly improving the optical efficiency of the module. This is of great significance for realizing high-performance full-color waveguide displays.

[0049] Experimental Example 2: Test on the effect of lens angle variation on image merging stability

[0050] The binocular AR diffractive waveguide display module prepared in Example 1 was placed on an optical testing platform. The fixture was adjusted so that the included angle between the left eyepiece 1 and the right eyepiece 2 was 172° (corresponding to the included angle of a traditional integrated type), 174°, 176°, 178°, and 180° (i.e., 0° included angle). Binocular images were captured at each included angle using a CCD camera. The image combination deviation angle was calculated using image processing software. The relative change of the image combination deviation at each included angle was calculated using the image combination deviation at the 172° included angle as the reference value. The results are shown in Table 1.

[0051] Table 1

[0052] Image deflection angle (′) 0.2 0.3 0.2 0.3 0.4 Relative change in image alignment deviation (%) — +0.1 0 +0.1 +0.2

[0053] As shown in Table 1, within the lens angle range of 172° to 180°, the binocular image convergence deviation angle is ≤0.4′, which is much smaller than the human eye's perceptible image convergence deviation threshold (usually 1′ to 2′). The maximum relative change in image convergence deviation is only 0.2′, indicating that the image convergence deviation does not change significantly with the lens angle. This result verifies the optical principle that when the projection optical engine 3 is set on opposite sides of the human eye, the image convergence distance is always equal to infinity. This proves that the present invention can improve wearing comfort by adjusting the lens angle while still maintaining excellent image convergence stability, overcoming the technical problem of image convergence deviation caused by structural component misalignment in traditional solutions.

[0054] Test Example 3: Lens Structural Strength Test

[0055] The binocular AR diffractive waveguide display modules prepared in Example 2 and Comparative Example 1 were used to conduct three-point bending tests on the three groups of samples using a universal testing machine. The sample span was 20 mm, the indenter loading speed was 0.5 mm / min, and the fracture load of the samples was recorded. The results are shown in Table 2.

[0056] Table 2

[0057] Comparative Example 1 One-piece nose bridge 28.3±5.2 The fracture occurred at the weak point in the coupling region. Example 2 Separate single-sided lens 67.8±8.1 The fracture location was random, with no obvious stress concentration. Example 2 Separate single-sided lens + protective cover 112.5±9.6 The fracture location is random, and the cover plate effectively bears the load.

[0058] As shown in Table 2, the average fracture load of the single-sided lens without the protective cover using the split structure is 67.8 N, significantly higher than the 28.3 N at the weak point of the bridge of the traditional one-piece lens, representing an improvement of 139%. In Example 2, the average fracture load after applying the protective cover further increases to 112.5 N, an improvement of approximately 297% compared to Comparative Example 1. Furthermore, the fracture locations in Comparative Example 1 are all concentrated in the weak structural area of ​​the coupling region, while the fracture locations in the experimental group are randomly distributed, indicating that the split structure eliminates the stress concentration areas in the original one-piece lens. These results demonstrate that the present invention effectively improves the structural strength and reliability of the lens, making it less prone to fracture during long-term wear and use, and improving durability and safety while reducing the burden on the structural components of the final product.

[0059] Experiment Example 4: Comparative Test of the Influence of Different Optical-Mechanical Arrangements on Image Synthesis Stability

[0060] The binocular AR diffractive waveguide display modules prepared in Example 2 and Comparative Example 1 were fixed on an optical testing platform to simulate the minute torsion deformation of the lenses during long-term wear. By adjusting the fixture, a minute angular displacement of ±0.5° was applied to the left and right eye lenses 2 respectively. The binocular images before and after the angular displacement were acquired by a CCD camera, and the change in the angular displacement was calculated. The results are shown in Table 3.

[0061] Table 3

[0062] Comparative Example 1 Same side of human eye 0.3 3.8 3.5 Example 2 Opposite side of human eye 0.2 0.4 0.2

[0063] As shown in Table 3, in Comparative Example 1, after a slight angular displacement of ±0.5° in the lens, the image alignment deviation increased sharply from 0.3′ to 3.8′, a change of 3.5′, exceeding the acceptable threshold range for human vision and severely impacting the viewing experience. In contrast, under the same angular displacement conditions, the image alignment deviation in the experimental group only changed from 0.2′ to 0.4′, a change of only 0.2′, with virtually no impact on image alignment stability. This result fully verifies the significant advantage of the key technology of arranging the optical engine and the human eye on opposite sides in this invention in ensuring image alignment stability. The fundamental reason is that the angle between the coupled principal ray and the lens normal does not change with lens deflection when arranged on opposite sides, thus effectively overcoming the technical defect of image alignment instability caused by structural deformation in traditional same-side schemes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A binocular AR diffractive waveguide display module, characterized in that: The device includes a left eyepiece (1), a right eyepiece (2), and a projection optical engine (3). The left eyepiece (1) and the right eyepiece (2) are independent separate structures. The left eyepiece (1) and the right eyepiece (2) each have an input diffraction optical element (4) and an output diffraction optical element (5). The projection optical engine (3) is arranged between the left eyepiece (1) and the right eyepiece (2) and is located on the opposite side of the human eye. The image light emitted by the projection optical engine (3) is coupled into the left eyepiece (1) and the right eyepiece (2) through the input diffraction optical element (4) and is coupled out to the human eye through the output diffraction optical element (5) after total internal reflection.

2. The binocular AR diffractive waveguide display module according to claim 1, characterized in that: The angle between the left eyepiece (1) and the right eyepiece (2) is adjustable.

3. A binocular AR diffractive waveguide display module according to claim 1, characterized in that: The input diffraction optical elements (4) on the left eyepiece (1) and the right eyepiece (2) are arranged adjacent to each other, and the adjacent sidewalls are provided with light-absorbing coatings (6).

4. A binocular AR diffractive waveguide display module according to claim 1, characterized in that: The input diffraction optical elements (4) on the left eyepiece (1) and the right eyepiece (2) are each independently configured as coupling gratings with asymmetric subwavelength structures.

5. A binocular AR diffractive waveguide display module according to claim 1, characterized in that: The output diffraction optical elements (5) on the left eyepiece (1) and the right eyepiece (2) are each independently configured as a two-dimensional coupling grating, or a one-dimensional folding grating and a one-dimensional coupling grating.

6. A binocular AR diffractive waveguide display module according to claim 1, characterized in that: The projection optical engine (3) is configured as a single-screen single-lens projection optical engine (3).

7. A binocular AR diffractive waveguide display module according to claim 1, characterized in that: The specific implementation of the left eye lens (1) and the right eye lens (2) is as follows: First, a high refractive index glass substrate is prepared, and nanoimprinting is performed on the structural region of the glass substrate to obtain two sets of symmetrically arranged input diffractive optical elements (4) and output diffractive optical elements (5). Then, an optical functional film is deposited in the structural region of the glass substrate. Then, the glass substrate is cut and separated along the central axis of the structural region, and a light-absorbing coating (6) is formed on the cut sidewall near the input diffractive optical element (4). Finally, a protective cover plate is superimposed on at least one side of the structural region to obtain the left eye lens (1) and the right eye lens (2).

8. A binocular AR diffractive waveguide display module according to claim 7, characterized in that: The cutting and separation process employs laser cutting or CNC cutting.

9. A binocular AR diffractive waveguide display module according to claim 7, characterized in that: The light-absorbing coating (6) is applied to the sidewalls with a light-shielding adhesive or a light-shielding ink, and the light-shielding adhesive or light-shielding ink does not overflow into the mirror area of ​​the glass substrate.

10. A binocular AR diffractive waveguide display module according to claim 7, characterized in that: The protective cover is made of optical glass or optical resin, and the cover is laminated by frame bonding or full bonding.

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