A waveguide display system

Abstract

The application provides a waveguide display system, relates to the field of AR technology, and comprises an optical machine, a light path turning element and an optical waveguide. The optical machine is located at a first side of the optical waveguide, the coupling-in side of the light path turning element is located at the coupling-out position of the optical machine, the coupling-out side of the light path turning element is located at a second side of the optical waveguide, and the first side and the second side are located at two sides of the optical waveguide respectively. The optical machine emits light rays towards the light path turning element, the light rays are incident into the optical waveguide from the second side of the optical waveguide through the light path turning element, and the light rays are coupled out from the optical waveguide to form an image light path after multiple propagations in the optical waveguide. The light path turning element enables the light rays to be coupled in from the second side of the optical waveguide, the optical machine is located at the first side of the optical waveguide, the space utilization is improved, the system volume is reduced, the integration difficulty is reduced, and the wearing comfort is improved.

Description

Technical Field

[0001] This application relates to the field of AR technology, specifically to a waveguide display system. Background Technology

[0002] In recent years, waveguide optical solutions have become the mainstream display structure in AR glasses due to their advantages such as thinness, high light transmittance, and compact structure. Among them, the folded waveguide structure uses multiple total reflection surfaces to reflect light multiple times within the waveguide, thereby compressing the optical path and achieving miniaturization of the display module.

[0003] However, traditional folded waveguide solutions suffer from limitations in overall optical structure, high integration difficulty, and large size and weight. Currently, although the industry has attempted to optimize system size and coupling effect by adjusting optical path design, introducing freeform surface optics, or improving coupler structure, the goal of maintaining optical path directional consistency and compact structure has not yet been achieved, thus limiting the further lightweight development of AR glasses products. Utility Model Content

[0004] The purpose of this application is to provide a waveguide display system that can overcome the spatial limitations of optomechanical layout, improve space utilization, and significantly reduce the overall size of the system.

[0005] In one aspect of this application, a waveguide display system is provided, including an optomechanical system, an optical path reversing element, and an optical waveguide. The optomechanical system is located on a first side of the optical waveguide, the coupling-in side of the optical path reversing element is located at the coupling-out point of the optomechanical system, and the coupling-out side of the optical path reversing element is located on a second side of the optical waveguide. The first side and the second side are respectively located on both sides of the optical waveguide.

[0006] The optical engine emits light rays toward the optical path reversing element. The light rays enter the optical waveguide from the second side of the optical waveguide through the optical path reversing element, and after propagating multiple times in the optical waveguide, they are coupled out of the optical waveguide to form an image.

[0007] Optionally, the optical path deflection element includes a prism, which has at least one set of refractive or total reflection surfaces, and the light rays are deflected by the set of refractive or total reflection surfaces of the prism before entering the optical waveguide.

[0008] Optionally, the optical waveguide includes a first waveguide sheet and a second waveguide sheet connected together. The first waveguide sheet and the second waveguide sheet are symmetrically arranged. The first waveguide sheet is provided with a first entrance pupil region and a first exit pupil region. The second waveguide sheet is provided with a second entrance pupil region and a second exit pupil region. The first entrance pupil region and the second entrance pupil region are symmetrical, and the first exit pupil region and the second exit pupil region are symmetrical.

[0009] The light is split into a first incident light and a second incident light by the optical path deflection element. The first incident light exits through the first entrance pupil region and the first exit pupil region, and the second incident light exits through the second entrance pupil region and the second exit pupil region.

[0010] Optionally, the first waveguide sheet is further provided with a first pupil expansion region, and the second waveguide sheet is further provided with a second pupil expansion region, wherein the first pupil expansion region and the second pupil expansion region are symmetrical.

[0011] Optionally, the first entrance pupil region and the second entrance pupil region are arranged adjacent to each other.

[0012] Optionally, the light output direction of the optomechanism is parallel to the coupling direction of the optical waveguide.

[0013] Optionally, the light emission direction of the optical engine forms an acute angle with the connecting line between the first waveguide and the second waveguide, and the light emitted from the optical engine obliquely enters the optical path deflection element so that the optical path deflection element bypasses the optical waveguide.

[0014] Optionally, the light output direction of the optomechanism is perpendicular to the coupling direction of the optical waveguide.

[0015] Optionally, gratings are respectively provided on the first entrance pupil area, the second entrance pupil area, the first dilated pupil area, the second dilated pupil area, the first exit pupil area, and the second exit pupil area.

[0016] Optionally, the optical engine is further provided with a collimation module for collimating light rays.

[0017] The waveguide display system provided in this application embodiment, by setting an optical path deflection element, causes the light path to bend in space, realizing the coupling of light from the second side of the optical waveguide. At the same time, the optical engine is located on the first side of the optical waveguide, breaking through the spatial limitations of the existing optical engine layout, improving the internal space utilization of the optical waveguide, and significantly reducing the overall system volume. By optimizing the overall structural design, the compactness and integration of the system are improved, the integration difficulty is reduced, and it is beneficial to the lightweight and wearing comfort of the waveguide display system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an existing folded waveguide structure;

[0020] Figure 2 This is a top view of the waveguide display system provided in the embodiments of this application;

[0021] Figure 3 This is a side view of the waveguide display system provided in an embodiment of this application;

[0022] Figure 4 This is one of the partial structural schematic diagrams of the waveguide display system provided in the embodiments of this application;

[0023] Figure 5 This is a second partial structural schematic diagram of the waveguide display system provided in the embodiments of this application;

[0024] Figure 6 This is one of the structural schematic diagrams of the waveguide display system provided in the embodiments of this application;

[0025] Figure 7 This is the third partial structural schematic diagram of the waveguide display system provided in the embodiments of this application;

[0026] Figure 8 This is a second schematic diagram of the waveguide display system provided in the embodiments of this application;

[0027] Figure 9 This is the third schematic diagram of the waveguide display system provided in the embodiments of this application;

[0028] Figure 10 This is the fourth partial structural schematic diagram of the waveguide display system provided in the embodiments of this application;

[0029] Figure 11 This is a schematic diagram of the optical path deflection element structure of the waveguide display system provided in the embodiments of this application;

[0030] Figure 12 This is the fourth schematic diagram of the waveguide display system provided in the embodiments of this application;

[0031] Figure 13 This is the fifth schematic diagram of the waveguide display system provided in the embodiments of this application.

[0032] Icons: 1-Folded waveguide; 2-Optical mechanism; 10-Optical waveguide; 101-First waveguide plate; 102-Second waveguide plate; 103-Entry pupil region; 104a-First pupil dilation region; 104b-Second pupil dilation region; 105a-First exit pupil region; 105b-Second exit pupil region; 11-Optical mechanism; 12-Optical path turning element; F1-First direction; F2-Second direction. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0034] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] It should also be noted that, unless otherwise explicitly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Augmented reality (AR) technology is a key technology that overlays virtual images onto real-world scenes, and it is widely used in fields such as smart wearables, industrial assistance, and medical visualization. In AR glasses, the size, weight, and optical performance of the optical display module directly affect the overall wearing comfort and display quality.

[0037] Folded waveguide 1 has become a common display structure in waveguide display systems due to its advantages. Existing folded waveguide 1 technologies include... Figure 1 As shown, but Figure 1 The folded waveguide 1 in the existing technology shown still faces some core challenges in practical applications. To ensure that the image input direction is consistent with the output direction (i.e., the human eye sees a telephoto image at infinity), traditional solutions often place the optical engine 2 on the outside of the folded waveguide 1, guiding the image to the eye through the coupling structure of the folded waveguide 1. This solution has the following drawbacks: First, the structural layout is limited: placing the optical engine 2 on the outside of the folded waveguide 1 requires additional space to bypass the folding structure, limiting the overall degree of freedom of the optical module. Second, the size and weight increase: a certain optical path must be maintained between the optical engine 2 and the folded waveguide 1, increasing the thickness and complexity of the module, which is not conducive to the miniaturization of AR devices. Third, integration is difficult: the external placement of the optical engine 2 not only complicates the structure but also brings more challenges to electrical connections and heat dissipation management. Fourth, wearing discomfort: due to the large thickness of the module, users may experience problems such as excessive weight at the front and pressure on the bridge of the nose when wearing the waveguide display system, affecting the user experience.

[0038] To address the problems of complex structure, large size, and limited optomechanical layout in existing folded waveguide augmented reality (AR) display systems, this application provides a waveguide display system that significantly optimizes the spatial layout and optical path design of the AR waveguide system without sacrificing display quality, effectively solving the problem of balancing structure, size, and performance in existing technologies.

[0039] Specifically, please refer to Figures 2-4 As shown, the waveguide display system provided in this application embodiment includes: an optomechanical system 11, an optical path turning element 12, and an optical waveguide 10. The optomechanical system 11 is located on the first side of the optical waveguide 10, the coupling-in side of the optical path turning element 12 is located at the coupling-out side of the optomechanical system 11, and the coupling-out side of the optical path turning element 12 is located on the second side of the optical waveguide 10.

[0040] The optical engine 11 emits light rays toward the optical path conversion element 12. The light rays enter the optical waveguide 10 from the second side of the optical waveguide 10 through the optical path conversion element 12, and after multiple propagations in the optical waveguide 10, they are coupled out of the optical waveguide 10 to form an image.

[0041] For example, Figures 2-4 The optical waveguide 10 is a folded optical waveguide. The optical waveguide 10 includes a first waveguide plate 101 and a second waveguide plate 102 connected together. Light rays enter the first waveguide plate 101 and the second waveguide plate 102 from the second side of the optical waveguide 10 through the optical path turning element 12, and exit through the first waveguide plate 101 and the second waveguide plate 102, respectively.

[0042] Furthermore, the first waveguide plate 101 and the second waveguide plate 102 of the folded optical waveguide are arranged at an angle of less than 180 degrees. The optomechanical system 11 is located on the side of the optical waveguide 10 with an angle of less than 180 degrees (the first side). The coupling-in side of the optical path turning element 12 is located at the coupling-out side of the optomechanical system 11, and the coupling-out side of the optical path turning element 12 is located on the side of the optical waveguide 10 with an angle of greater than 180 degrees (the second side). The following description uses the optical waveguide 10 as a folded optical waveguide.

[0043] The optical engine 11 is used to generate virtual images and includes a micro-display (such as LCOS, Micro-LED, OLED, etc.), a collimation module, etc. The collimation module can project the image into a collimated beam incident light path turning element 12. The entire optical engine 11 is arranged inside the optical waveguide 10, close to the wearer's eye position, breaking the traditional structural limitation that the optical engine 11 must be placed outside the waveguide in order to achieve consistency between input light and output light.

[0044] Furthermore, in Figures 2-4 In the example, the light output direction of the optical engine 11 is parallel to the coupling direction of the optical waveguide 10, that is, the optical engine 11 is set along the first direction F1, so the optical engine 11 outputs light along the first direction F1.

[0045] The optical path deflection element 12 is located on the coupling side of the optomechanical system 11 and is used to deflect the image light from the optomechanical system 11 at a 90-degree or other specified angle in space, so that the light can bypass the optical waveguide 10 and be guided to couple into the optical waveguide 10 from the outside of the optical waveguide 10.

[0046] The optical waveguide 10 is used to perform image transmission and export functions. It achieves compressed transmission of the optical path through the entrance pupil area 103, exit pupil area, and even the dilation pupil area on the waveguide sheet, so that the image propagates in a consistent direction and is finally projected to the human eye in a telephoto form to form a virtual image.

[0047] The entrance pupil region 103, the dilation pupil region, and the exit pupil region can be constructed using gratings, microstructures, or surface coatings to diffract light in each region. After entering the waveguide, the light propagates through multiple folds according to the pre-set reflection structure inside the waveguide (total internal reflection surface, TIR structure, or folded grating).

[0048] The output end of the optical waveguide 10 is the human eye observation area, used to receive and view the guided virtual graphics, realizing a visual experience of virtual and real superposition.

[0049] In addition, the waveguide display module may also include a housing. The aforementioned components are precisely integrated and packaged within this housing. The housing design ensures stable relative positions of the components and accurate alignment of the optical path. The system is small in size and thin, making it suitable for use in terminal products such as AR glasses, and possesses excellent mass production feasibility and structural reliability.

[0050] If the side of optical waveguide 10 with an angle less than 180 degrees is defined as the inner side of optical waveguide 10, then the side of optical waveguide 10 with an angle greater than 180 degrees is defined as the outer side of optical waveguide 10. Figure 2 In the optical system, the optical engine 11 is located inside the optical waveguide 10. An optical path reversing element 12 is provided on the output side of the optical engine 11. The light emitted by the optical engine 11 is coupled into the optical path reversing element 12 from the input side. After multiple reflections, the light is coupled out from the output side of the optical path reversing element 12. The optical path reversing element 12 drives the light around the optical waveguide 10 and couples it into the entrance pupil region 103 of the optical waveguide 10 from its outside.

[0051] When light passes through the optical path reversing element 12, the optical path reversing element 12 splits the light into a parallel and spaced first incident light and a second incident light. The first incident light and the second incident light are coupled into the entrance pupil region 103 of the optical waveguide 10, and then propagate through the entrance pupil region 103 to the exit pupil region of the first optical waveguide and the exit pupil region of the second optical waveguide, respectively.

[0052] The waveguide display system provided in this application embodiment, by setting an optical path deflection element 12, causes the light path to bend in space, realizing that the light enters from the outside of the optical waveguide 10. At the same time, the optical engine 11 is located inside the optical waveguide 10, closer to the human eye, so that the optical engine 11 and the human eye are on the same side (inside the optical waveguide 10), ensuring that the imaging direction is consistent with the output direction, realizing infinity-focus display, and avoiding problems such as image distance changes or virtual image shift. Setting the optical engine 11 inside the optical waveguide 10 breaks through the spatial limitations of the existing optical engine 11 layout, improves the internal space utilization of the optical waveguide 10, and significantly reduces the overall system volume. By optimizing the overall structural design, the compactness and integration of the system are improved, the integration difficulty is reduced, and it is beneficial to the lightweight and wearing comfort of the waveguide display system.

[0053] The waveguide display system provided in this application embodiment has strong adaptability. It is compatible with existing folded waveguide systems and can also be extended to various waveguide materials and optical coupling schemes, exhibiting good versatility and engineering feasibility. Through the above-mentioned configuration, the problems of large space occupation, limited layout, and difficulty in miniaturization and integration of the optomechanical 11 in the prior art are effectively solved, significantly improving the space utilization, structural flexibility, and imaging consistency of the waveguide AR display system.

[0054] The waveguide display system provided in this application embodiment is applicable to augmented reality (AR) optical display systems based on waveguide structures, and is especially suitable for wearable devices with high requirements for lightweight, compactness and wearing comfort, such as AR glasses, head-mounted displays (HMDs), and industrial helmet display modules.

[0055] In the example of this application, the optical path deflection element 12 includes a prism having at least one set of refractive or total reflection surfaces. Light rays are deflected by the set of refractive or total reflection surfaces of the prism and then enter the optical waveguide 10.

[0056] The prism possesses excellent transmittance and surface smoothness, enabling light to pass through efficiently. The prism's geometry and refractive surface design are optimized so that the incident light, after being deflected by the prism, meets the angle and direction requirements for waveguide coupling, ensuring that the final output image direction is consistent with the direction received by the human eye, achieving a telephoto infinity imaging effect.

[0057] A prism has a set of refractive or total reflection surfaces, which causes the incident light beam to be spatially deflected once or multiple times in the prism, forming an output light in a vertical or inclined direction.

[0058] In one embodiment, please refer to Figure 5 , Figure 6As shown, the first waveguide 101 and the second waveguide 102 are symmetrically arranged. The first waveguide 101 is provided with a first entrance pupil region 103, a first dilation pupil region 104a and a first exit pupil region 105a. The second waveguide 102 is provided with a second entrance pupil region 103, a second dilation pupil region 104b and a second exit pupil region 105b. The first entrance pupil region 103 and the second entrance pupil region 103 are symmetrical, the first dilation pupil region 104a and the second dilation pupil region 104b are symmetrical, and the first exit pupil region 105a and the second exit pupil region 105b are symmetrical.

[0059] The light is split into a first incident light and a second incident light by the light path conversion element 12. The first incident light exits through the first entrance pupil region 103, the first dilation pupil region 104a and the first exit pupil region 105a, and the second incident light exits through the second entrance pupil region 103, the second dilation pupil region 104b and the second exit pupil region 105b.

[0060] The first entrance pupil region 103 and the second entrance pupil region 103 are arranged adjacent to each other to form the entrance pupil region 103; Figure 5 The blue light beam illustrates the process by which the optical engine 11 emits light from inside the optical waveguide 10 and couples into the optical waveguide 10 from the outside via the optical path deflection element 12. Figure 6 To facilitate the coupling and imaging process of the entire optical waveguide 10, the specific process is as follows: The optomechanical system 11 located inside the optical waveguide 10 emits light that enters the optical path reversing element 12. After multiple reversals and reflections by the optical path reversing element 12, the light is coupled into the optical waveguide 10 from the entrance pupil region 103 outside the optical waveguide 10. Utilizing the symmetry of diffraction, part of the light (the first incident light) propagates towards the first waveguide plate 101, and part of the light (the second incident light) propagates towards the second waveguide plate 102. Upon reaching the first pupil region 104a and the second pupil region 104b, the light is reversed by these regions and propagates towards the first exit pupil region 105a and the second exit pupil region 105b. Finally, the light is coupled out through the first exit pupil region 105a and the second exit pupil region 105b to form an image, as shown below. Figure 6 As shown by the red light in the image, the two output beams are parallel in direction.

[0061] Placing the optical engine 11 on the same side as the human eye makes the system highly integrated and greatly reduces the forward thickness of the system. The setting of the optical path turning element 12 solves the problem of the traditional external optical engine 11, realizing the purpose of coupling light from the outside but arranging the optical engine 11 on the inside, so that the direction of the displayed image is consistent, realizing far-focus visual imaging and adapting to the needs of AR for comfortable viewing for a long time.

[0062] Furthermore, the light output direction of the optomechanical system 11 forms an acute angle with the connecting line between the first waveguide plate 101 and the second waveguide plate 102, and the light emitted from the optomechanical system 11 obliquely enters the optical path deflection element 12 so that the optical path deflection element 12 is arranged to bypass the optical waveguide 10.

[0063] Figure 5 and Figure 6 In the middle, the optical engine 11 is located below the line connecting the first waveguide 101 and the second waveguide 102. The optical engine 11 emits light obliquely upward, and the optical path turning element 12 passes over the top of the optical waveguide 10, so that the light is coupled into the optical waveguide 10.

[0064] In other embodiments, such as Figure 7 , Figure 8 As shown, the optomechanical system 11 is located above the line connecting the first waveguide plate 101 and the second waveguide plate 102. The optomechanical system 11 emits light diagonally downwards, and the optical path deflection element 12 passes around the bottom of the optical waveguide 10, so that the light is coupled into the optical waveguide 10.

[0065] In some embodiments, such as Figure 9 As shown, the waveguide plate does not have a pupil expansion area, but only an entrance pupil area 103 and an exit pupil area. The light emitted by the optical engine 11 enters the entrance pupil area 103 through the optical path turning element 12, is coupled into the optical waveguide through the entrance pupil area 103 for propagation, and finally is coupled out through the corresponding exit pupil area to form an image.

[0066] For small-sized applications, omitting the pupil expansion area can reduce the size of the optical waveguide 10, making the system more compact.

[0067] In the aforementioned embodiments, the optical engine 11 is arranged along the first direction F1, that is, the light output direction of the optical engine 11 is parallel to the coupling direction of the optical waveguide 10.

[0068] exist Figure 10 In this example, the light output direction of the optomechanism 11 is perpendicular to the coupling direction of the optical waveguide 10, that is, the optomechanism 11 is positioned along the second direction F2 and emits light along the second direction F2. The optomechanism 11 is laterally located inside the optical waveguide 10, and the structure of the optical path deflection element 12 has been adjusted accordingly. Figure 11 The diagram shows the structure corresponding to the optical path reversing element 12. The optical path reversing element 12 is a U-shaped structure. The red line indicates how the light emitted by the optical engine 11 is reversed by the optical path reversing element 12 and crosses to the outside of the optical waveguide 10, so that the light is coupled into the optical waveguide 10 from the outside.

[0069] The different orientations of the aforementioned optical engine 11 can be adapted to different scenario requirements.

[0070] Therefore, the waveguide display system provided in this application embodiment, through the optical mechanism 11 built into the optical waveguide 10, the optical path reversal element 12, and the coupling of light to the outside of the optical waveguide 10, can keep the entire optical path directionally consistent, ensuring that the virtual image perceived by the human eye is located at the far-focus infinity, avoiding visual fatigue; the position and angle between the optical mechanism 11, the optical path reversal element 12, and the optical waveguide 10 are precisely controlled through integrated structural design, avoiding optical path deviation or imaging distortion, giving the system good structural closure and optical calibration tolerance, facilitating mass production and assembly. It significantly optimizes the spatial structure of the waveguide AR system while retaining high-quality far-focus display performance, making it suitable for AR products with high requirements for both shape and display quality, and resolving the contradiction between space utilization and imaging consistency in traditional structures.

[0071] On the other hand, the optomechanical element 11 and optical path transition element 12 of this application can be applied not only to the aforementioned folded optical waveguides, but also to ordinary flat waveguides, that is, the optical waveguide 10 can also be a flat waveguide, such as... Figure 12 , Figure 13 As shown.

[0072] Furthermore, the device has different application requirements under different circumstances. For example, in the aforementioned embodiment, the optical engine 11 is built-in (i.e., the optical engine 11 is located inside the optical waveguide 10, on the same side as the user), but the light is coupled in from the outside of the optical waveguide 10, and the light efficiency is better when coupled in from the outside. Figure 12 The flat waveguide also demonstrates the integration of the Optical Engine 11.

[0073] Or, the optical engine 11 could be external, such as... Figure 13 As shown, the optical engine 11 is located outside the optical waveguide 10, and light rays are coupled into the optical waveguide 10 from the inside, saving internal space.

[0074] The waveguide display system provided in this application embodiment can be flexibly deployed in monocular, binocular, or holographic AR terminals. It can also expand the prism and waveguide structure size and optical path design according to different FOV (field of view) requirements to adapt to various industry and consumer application needs.

[0075] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A waveguide display system, characterized in that, include: An optical engine, an optical path switching element, and an optical waveguide are provided. The optical engine is located on a first side of the optical waveguide. The coupling-in side of the optical path switching element is located at the coupling-out point of the optical engine. The coupling-out side of the optical path switching element is located on a second side of the optical waveguide. The first side and the second side are located on opposite sides of the optical waveguide, respectively. The optical engine emits light rays toward the optical path reversing element. The light rays enter the optical waveguide from the second side of the optical waveguide through the optical path reversing element, and after propagating multiple times in the optical waveguide, they are coupled out of the optical waveguide to form an image.

2. The waveguide display system according to claim 1, characterized in that, The optical path deflection element includes a prism, which has at least one set of refractive or total reflection surfaces. The light rays are deflected by the set of refractive or total reflection surfaces of the prism and then enter the optical waveguide.

3. The waveguide display system according to claim 1, characterized in that, The optical waveguide includes a first waveguide sheet and a second waveguide sheet connected together. The first waveguide sheet and the second waveguide sheet are symmetrically arranged. The first waveguide sheet is provided with a first entrance pupil region and a first exit pupil region. The second waveguide sheet is provided with a second entrance pupil region and a second exit pupil region. The first entrance pupil region and the second entrance pupil region are symmetrical. The first exit pupil region and the second exit pupil region are symmetrical. The light is split into a first incident light and a second incident light by the optical path deflection element. The first incident light exits through the first entrance pupil region and the first exit pupil region, and the second incident light exits through the second entrance pupil region and the second exit pupil region.

4. The waveguide display system according to claim 3, characterized in that, The first waveguide sheet is further provided with a first pupil expansion region, and the second waveguide sheet is further provided with a second pupil expansion region, the first pupil expansion region and the second pupil expansion region being symmetrical.

5. The waveguide display system according to claim 3, characterized in that, The first entrance pupil region and the second entrance pupil region are arranged adjacent to each other.

6. The waveguide display system according to any one of claims 3 to 5, characterized in that, The light output direction of the optical engine is parallel to the coupling direction of the optical waveguide.

7. The waveguide display system according to claim 6, characterized in that, The light emission direction of the optical engine forms an acute angle with the connecting line between the first waveguide and the second waveguide. The light emitted from the optical engine is obliquely incident on the optical path deflection element so that the optical path deflection element bypasses the optical waveguide.

8. The waveguide display system according to any one of claims 1 to 5, characterized in that, The light output direction of the optical engine is perpendicular to the coupling direction of the optical waveguide.

9. The waveguide display system according to claim 4, characterized in that, A grating is provided on the first entrance pupil area, the second entrance pupil area, the first dilated pupil area, the second dilated pupil area, the first exit pupil area, and the second exit pupil area.

10. The waveguide display system according to any one of claims 1 to 5, characterized in that, The optical engine is also equipped with a collimation module for collimating light rays.

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