Optical system and near-eye display device

Abstract

The application provides an optical system and a near-eye display device. The optical system comprises: a waveguide assembly; a transparent cover plate arranged on the light-out side of the waveguide assembly; and an optical control component arranged on the transparent cover plate; wherein the optical control component is configured to control the leakage light leaked from the waveguide assembly to the side of the transparent cover plate, so as to make the leakage light deviate from the visible range of the human eye. The optical system can significantly improve the contrast and clarity of the display image, and improve the visual experience of the user.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to an optical system and a near-eye display device. Background Technology

[0002] Near-eye display devices, such as augmented reality (AR) head-mounted displays, typically use waveguide technology to transmit image light emitted from the optical engine to the human eye. However, in practical applications, due to manufacturing tolerances, surface defects, or angular deviations, some of the light beam transmitted within the waveguide assembly may leak to the outside of the waveguide assembly: transmitted light may cause image information leakage, while reflected light may enter the preset eye box area, forming stray light or ghosting, severely reducing image contrast and clarity, and affecting the user experience.

[0003] Existing solutions mostly focus on optimizing the design of the input / output gratings inside the waveguide components, or adding a light-shielding coating for blocking. However, the former has limited effect on controlling the leakage light, while the latter may affect the light transmittance and appearance.

[0004] Therefore, how to effectively control the light leaking from waveguide components and prevent it from entering the visible range of the human eye has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This application provides an optical system and a near-eye display device. The optical system can significantly improve the contrast and clarity of the displayed image and improve the user's visual experience.

[0006] This application provides an optical system for use in near-eye display devices, the optical system comprising: Waveguide components; A transparent cover plate is disposed on the light-emitting side of the waveguide assembly; An optical adjustment control device is disposed on the transparent cover plate; The optical adjustment control is configured to regulate the leaked light from the waveguide assembly to the transparent cover plate side, so that the leaked light is deviated from the range of human vision.

[0007] In some embodiments, the optical tuning control is a diffraction grating; the optical tuning control is configured to modulate the leaked light to at least one of the following directions: The leaked light is reflected by the diffraction grating to form a first reflected light, which is located outside the preset eye box area; The leaked light is transmitted through the diffraction grating to form first transmitted light, which deviates from the extension direction of the central optical axis of the preset eye box area; The leaked light is coupled into the transparent cover plate through the diffraction grating and forms a second reflected light within the transparent cover plate. The second reflected light then undergoes total internal reflection within the transparent cover plate.

[0008] In some embodiments, there is a gap between the waveguide assembly and the optical tuning control; the refractive index of the optical tuning control is greater than that of air, causing at least a portion of the leaked light to undergo total internal reflection at the interface between the optical tuning control and the air to form the first reflected light.

[0009] In some embodiments, the propagation path of the first reflected light satisfies equation (2): tanγ ≥ h / d(2; Wherein, γ is the angle between the first reflected light and the central optical axis of the preset eye box region, h is the distance from the edge of the preset eye box region along the extension direction perpendicular to the central optical axis of the preset eye box region at the reflection point of the first reflected light on the diffraction grating, and d is the distance to the preset eye box region along the extension direction parallel to the central optical axis of the preset eye box region.

[0010] In some embodiments, the angle between the first transmitted light and the extension direction of the central optical axis of the preset eye box region is greater than or equal to 45°.

[0011] In some embodiments, the optical system further includes a light-absorbing structure disposed inside the optical system and on the optical path of the first reflected light.

[0012] In some embodiments, the waveguide assembly includes a waveguide substrate, an input grating, and an output grating, wherein the projection of the optical modulation control onto the waveguide assembly at least partially coincides with the input grating and / or the output grating.

[0013] In some embodiments, the optical system further includes a frame disposed between the transparent cover and the waveguide assembly to fix the transparent cover and the waveguide assembly, and the frame is disposed at the edge of the transparent cover and the waveguide assembly.

[0014] In some embodiments, the transparent cover has two opposing surfaces in the thickness direction, at least one of which is a curved surface.

[0015] This application embodiment also provides a near-eye display device, including: An optical engine is used to emit a beam of light that carries image information; An optical system, wherein the optical system is the aforementioned optical system, and the optical system is disposed on the light-emitting side of the optical engine.

[0016] The optical system and near-eye display device provided in this application embodiment have an optical adjustment control on the surface of a transparent cover plate to control the light leaking from the waveguide component to the transparent cover plate side, so that the leaked light is deviated from the range of human eye vision, thereby avoiding stray light, ghost images and information leakage, improving the contrast and clarity of the displayed image, and improving the user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the optical system provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the optical path of the optical system provided in the embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] Waveguide technology is widely used in near-eye display devices such as augmented reality and virtual reality because it enables thin and lightweight designs. However, in actual products, due to manufacturing tolerances, surface defects, or angular deviations, the image beam transmitted within the waveguide assembly often experiences partial leakage, passing through the waveguide assembly and entering the transparent cover area above. Of these leaked beams, some are directly transmitted through the transparent cover, potentially causing image information leakage; others, after multiple reflections from the inner wall of the transparent cover, accidentally enter the preset eye box area, forming stray light or ghosting, resulting in decreased image contrast, ghosting, or halos, severely affecting the user's visual immersion and user experience.

[0022] To address the aforementioned issues, existing improvement solutions mainly focus on optimizing the coupling grating structure and / or coupling out grating structure on the waveguide, or on absorbing or blocking light by adding a light-shielding coating. However, these methods have limited ability to control the light that has leaked to the transparent cover plate side, and the light-shielding coating can easily affect the overall light transmittance and appearance.

[0023] This application provides an optical system and a near-eye display device. The optical system avoids problems such as stray light, ghosting, and information leakage, significantly improving the contrast and clarity of the displayed image and enhancing the user's visual experience. The following detailed description is in conjunction with the accompanying drawings.

[0024] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the optical system provided in an embodiment of this application.

[0025] This application provides an optical system 100. The optical system 100 is applied in near-eye display devices. Specifically, the optical system 100 can be applied to near-eye display devices such as AR glasses and AR head-mounted devices.

[0026] The optical system 100 includes a waveguide assembly 10, a transparent cover plate 20, and an optical adjustment control 30.

[0027] The waveguide assembly 10 is used to transmit the light beam carrying image information, realizing the transmission of image light from the optical engine to the human eye.

[0028] A transparent cover plate 20 is disposed on the light-emitting side of the waveguide assembly 10 to protect internal components and isolate them from the external environment.

[0029] An optical modulation control 30 is disposed on the transparent cover plate 20, for example, by bonding or coating. The optical modulation control 30 may be one or more combinations of a diffraction grating, a microstructure array, or a coating with a specific refractive index. The specific structural parameters of the optical modulation control 30 (such as grating period, blaze angle, microstructure shape, coating thickness, etc.) can be optimized according to the angular distribution and wavelength characteristics of the leaked light to ensure the modulation effect.

[0030] The optical control unit 30 is configured to regulate the leaked light from the waveguide assembly 10 to the transparent cover plate 20 side, and change its propagation path by means of diffraction, reflection or absorption, so that the leaked light is deviated from the range of human vision.

[0031] The visible range of the human eye here mainly includes two specific situations: For users located on the light-emitting side of the waveguide component 10, the visible range of the human eye refers to the preset eye box area, that is, the three-dimensional spatial range in which the user's pupil may move, as determined during the design; For potential bystanders, the visible range of the human eye refers to the direction of their line of sight that may capture the leaked light when they look directly at the near-eye display device.

[0032] It is understood that the optical system 100 in this application can achieve the function of combining virtual and real elements. Image light propagates from the optomechanical system to the human eye through the waveguide component 10, while ambient light enters the human eye from the external environment through the transparent cover plate 20 and the waveguide component 10. The ambient light and image light are spatially superimposed, ultimately forming a fused virtual and real visual perception on the human eye's retina.

[0033] The optical system 100 has an optical adjustment control 30 on the surface of the transparent cover plate 20, which is used to control the light leaked from the waveguide component 10 to one side of the transparent cover plate 20, so that the leaked light is deviated from the range of human vision, thereby avoiding stray light, ghost images and information leakage, improving the contrast and clarity of the displayed image, and improving the user experience.

[0034] Specifically, in applications such as AR glasses, users can receive navigation prompts, real-time data, or virtual objects while observing their surroundings, forming virtual information. Building upon this, the optical modulation control 30 further eliminates stray light interference with the virtual-real overlay effect by suppressing leaked light, allowing virtual images to be presented on the real background with higher contrast and clarity, thus enhancing the realism and usability of the virtual-real fusion.

[0035] In some embodiments, the optical modulation control 30 is a diffraction grating. The diffraction grating can selectively modulate the angle and wavelength of the incident light using its periodic microstructure. By designing parameters such as the grating period, groove shape, and blaze angle of the diffraction grating, precise optical control of the leaked light can be achieved, guiding it in a specific direction and ultimately causing it to deviate from the range of human vision.

[0036] Diffraction gratings can be tilted gratings, blazed gratings, polarization-selective gratings, two-dimensional lattice gratings, or chirped gratings. These types of gratings can be selected or combined based on the angular distribution, polarization characteristics, and wavelength range of the actual leaked light. For example, tilted gratings or chirped gratings can be used for leaked light with a wide angular distribution; blazed gratings can be selected for scenarios requiring efficient utilization of diffraction energy; and polarization-sensitive display systems can benefit from additional control dimensions using polarization-selective gratings. By appropriately selecting the grating type, targeted and efficient suppression of leaked light from different sources can be achieved, significantly improving the stray light control capability of the optical system.

[0037] The optical modulation control 30 is configured to modulate the leaked light to at least one of the following directions to eliminate the interference of the leaked light from different physical mechanisms.

[0038] The first direction is: the leaked light is reflected by the diffraction grating to form a first reflected light L1, and the first reflected light L1 is located outside the preset eye box area.

[0039] When the leaked light is incident on the surface of the diffraction grating, a portion of the energy is reflected by the diffraction grating into the first reflected light L1. The first reflected light L1 propagates toward the waveguide assembly 10 and is deflected so that its propagation path avoids the preset eyebox region.

[0040] The second direction is as follows: the leaked light is transmitted through a diffraction grating to form a first transmitted light L2, which deviates from the extension direction of the central optical axis of the preset eye box area. For leaked light in the transmission direction, if it were to exit directly, it would be easily observed by bystanders, causing information leakage. This application designs the direction of transmission diffraction to deflect the first transmitted light L2 to a direction deviating from the extension direction of the central optical axis of the preset eye box area, thus deviating it from the normal line of sight. Even if this portion of the light is not completely absorbed, its propagation direction is already far from the line of sight of the user and bystanders, effectively reducing the risk of information leakage.

[0041] It is worth noting that the central optical axis of the preset eye box area refers to the virtual axis that is perpendicular to the central plane of the eye box area and passes through the geometric center of the preset eye box area.

[0042] The third direction is as follows: the leaked light is coupled into the transparent cover plate 20 via a diffraction grating, and forms a second reflected light L3 within the transparent cover plate 20. The second reflected light L3 propagates through total internal reflection within the transparent cover plate 20. When the leaked light is incident on the optical modulation control 30 at a specific angle, the refractive index of the diffraction grating is higher than that of air, and the diffraction grating can provide wave vector matching. A portion of the light can be efficiently coupled into the transparent cover plate 20 to form the second reflected light L3, and propagates repeatedly within the transparent cover plate 20 at an angle greater than the critical angle for total internal reflection at the interface between the transparent cover plate 20 and air, until the energy is dissipated due to absorption or scattering.

[0043] The three control methods described above can be implemented individually or in combination. For example, for leaked light at different angles or wavelengths, the diffraction grating can simultaneously generate reflection and transmission diffraction, guiding it to different safe directions; or it can couple a portion of the light into the transparent cover plate 20 for total internal reflection, while the other portion is transmitted to the outside of the field of view. Through this multi-channel, multi-mechanism synergistic control, leaked light from different sources and with different characteristics can be controlled, significantly improving the ability to suppress leaked light from the waveguide component 10.

[0044] Structurally, there is a gap between the waveguide assembly 10 and the optical tuning control 30; the refractive index of the material of the optical tuning control 30 is greater than that of air, so that at least a portion of the leaked light undergoes total internal reflection at the interface between the optical tuning control 30 and air to form a first reflected light L1, which is reflected back to the waveguide assembly 10 side, which is the aforementioned first direction.

[0045] In some specific embodiments, when the leaked light enters the optical modulation control 30 from the air layer, it satisfies Snell's law (the law of refraction), as shown in equation (1).

[0046] n1sinβ=n2sinα(1).

[0047] Where n1 is the refractive index of the air layer, n2 is the refractive index of the optical modulator 30, β is the incident angle of the leaked light in the air layer, and α is the refraction angle of the leaked light after entering the optical modulator 30.

[0048] Equation (1) describes the change in the propagation direction of light when it passes through different medium interfaces, providing a basis for the subsequent analysis of total internal reflection conditions.

[0049] Meanwhile, based on the same refractive index conditions, the diffraction grating can also utilize its periodic structure to provide wave vector matching, coupling another portion of the leaked light into the transparent cover plate 20 to form a second reflected light L3. This light undergoes total internal reflection at the interface between the transparent cover plate 20 and the air, thus being confined within the transparent cover plate 20 to maintain total internal reflection propagation, which is the aforementioned third direction.

[0050] Furthermore, the material of the optical modulator 30 can be an optical polymer, high-refractive-index glass, or a nanocomposite coating, with a refractive index ranging from 1.2 to 1.8. For example, the refractive index of the optical modulator 30 is 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8. This range is selected based on the following considerations: to ensure that leaked light at a specific angle can undergo total internal reflection at its interface with air using the refractive index difference (corresponding to the first control direction), and can also be efficiently coupled into the transparent cover plate for total internal reflection propagation through wave vector matching of the diffraction grating (corresponding to the third control direction), the refractive index of the optical modulator 30 needs to be controlled within a range that satisfies the critical angle requirement for total internal reflection and matches the material of the transparent cover plate. A refractive index that is too low (close to air) cannot form an effective total internal reflection interface; a refractive index that is too high (above 1.8), while beneficial for total internal reflection conditions, may increase material costs and manufacturing difficulties. With the refractive index within this range, it can ensure that the interface between the optical tuning control 30 and the air has a sufficiently large critical angle coverage for total internal reflection, and it is also easy to achieve through conventional coating or plating processes, thus achieving a balance between optical performance and manufacturing cost.

[0051] For some specific implementation methods, please refer to Figure 2 , Figure 2 The optical path diagram of the optical system provided in the embodiment of this application corresponds to the first direction mentioned above, and the propagation path of the first reflected light L1 satisfies equation (2).

[0052] tanγ ≥ h / d (2).

[0053] Wherein, γ is the angle between the first reflected light L1 and the central optical axis 300 of the preset eye box region 11, h is the distance from the reflection point 200 of the first reflected light L1 on the diffraction grating to the edge of the preset eye box region 11 (the lower edge shown in the figure) along the direction perpendicular to the central optical axis 300 of the preset eye box region 11, and d is the distance to the preset eye box region 11 along the direction parallel to the central optical axis 300 of the preset eye box region 11.

[0054] Therefore, by designing the reflection angle of the diffraction grating, the emission direction of the first reflected light L1 is always located in the spatial region below the lower edge or above the upper edge of the preset eye box region 11. That is, when equation (2) is satisfied, when the first reflected light L1 propagates to the horizontal position of the preset eye box region 11, its vertical height is outside the edge of the preset eye box region 11, thus preventing it from entering the range of motion of the user's pupil.

[0055] In some specific embodiments, the angle between the first transmitted light L2 and the extended direction of the central optical axis of the preset eye box region is greater than or equal to 45°. For example, 45°, 50°, 60°, and 70°. The selection of this angle range is based on the physiological characteristics of human eye vision: under normal observation conditions, the main visual field of human eyes is located within ±30° in the direction parallel to the central optical axis 30° (i.e., the horizontal direction). Even if the eyeball rotates, the effective vertical visual field in the horizontal direction usually does not exceed 60°.

[0056] When the first transmitted light L2 is emitted upward or downward at an angle greater than or equal to 45° away from the central optical axis, its propagation direction has significantly deviated from the normal line of sight of the observer. Even if this part of the light is not completely absorbed or blocked, its propagation path has been far away from the sensitive area of ​​the human eye, thereby effectively reducing the risk of the transmitted light being directly observed or accidentally entering the preset eye box area after secondary reflection within the system.

[0057] In some embodiments, the optical system 100 further includes a light-absorbing structure disposed inside the optical system 100 and disposed on the optical path of the first reflected light L1 reflected by the diffraction grating, for absorbing residual light that may still exist after reflection modulation, and preventing it from accidentally entering the preset eye box area after multiple reflections.

[0058] The light-absorbing structure may include at least one of carbon black or a black dye. Carbon black has broadband light absorption characteristics, maintains a high absorption rate in the visible light band, has good chemical stability, and is low in cost, making it suitable for coating or doping molding processes. Black dyes, on the other hand, can be precisely placed at designated optical path positions through printing, spraying, or other methods, making them suitable for scenarios where the shape and size of the light-absorbing area have precision requirements. Both materials can be integrated into the optical system 100 using conventional processes without affecting the original structure and optical performance of the optical system 100.

[0059] In some embodiments, the waveguide assembly 10 includes a waveguide substrate, an input grating, and an output grating, and the projection of the optical tuning control 30 onto the waveguide assembly 10 at least partially overlaps with the input grating and / or the output grating.

[0060] The coupling grating is the main interface for image light output and also the location where light is prone to leakage. When image light is diffracted at the coupling grating, some light rays may not completely enter the preset eyepiece area due to angular deviation, and instead leak towards the transparent cover plate 20. Setting the optical adjustment control 30 at the position corresponding to the coupling grating allows for timely adjustment near the source of leakage.

[0061] There is also a possibility of leakage at the coupling grating. When the light beam emitted by the optomechanical system enters the waveguide substrate through the coupling grating, if the coupling efficiency is not 100%, some light may be directly transmitted or reflected to the transparent cover plate 20 side. By setting an optical adjustment control 30 in the corresponding area of ​​the coupling grating, this early leakage can be intercepted, preventing it from propagating along the transparent cover plate 20 to the preset eye box area.

[0062] When the projection of the optical modulation control 30 simultaneously covers both the output grating and the input grating, leakage light from these two main optical interfaces can be suppressed. The proportion of the overlapping area can be adjusted according to the actual leakage light intensity. For example, a larger area of ​​anti-leakage structure can be set in the output grating area where leakage is stronger, and a smaller area of ​​structure can be set in the input grating area where leakage is weaker.

[0063] In some embodiments, the optical system 100 further includes a frame disposed between the transparent cover plate 20 and the waveguide assembly 10 to fix the transparent cover plate 20 and the waveguide assembly 10, and the frame is disposed at the edge of the transparent cover plate 20 and the waveguide assembly 10.

[0064] The frame forms a stable support structure between the transparent cover plate 20 and the waveguide assembly 10, ensuring their relative positions are fixed and preventing optical path misalignment or component damage caused by external forces or temperature changes. Simultaneously, the frame's edge-mounted design also provides a seal, preventing dust, moisture, and other contaminants from entering the optical area between the transparent cover plate 20 and the waveguide assembly 10, maintaining the cleanliness of the internal optical interface, and thus ensuring long-term stability of total internal reflection conditions and diffraction efficiency.

[0065] In some embodiments, the transparent cover 20 has two opposing surfaces in the thickness direction, at least one of which is curved.

[0066] Curved designs help improve appearance and ergonomic fit. For head-mounted devices, the outer surface of the transparent cover 20 usually needs to be in harmony with the overall shape of the device; a curved structure can make the appearance smoother and improve the fit when worn.

[0067] Furthermore, curved surfaces can be used as optical lenses. They can regulate ambient light to some extent, such as changing the direction of incident ambient light or reducing reflected glare.

[0068] This application also provides a near-eye display device, which can be AR glasses, AR head-mounted devices, etc., and can be used to realize the overlay display of virtual images and real scenes.

[0069] The near-eye display device includes an optical engine and the optical system 100 described in any of the foregoing embodiments.

[0070] Optical engines are used to emit beams of light that carry image information. They typically include a miniature display screen and a projection lens group, and can output image information in the form of collimated or converged beams.

[0071] An optical system is located on the light-emitting side of the optomechanical system to receive and transmit the light beam to the human eye. This optical system employs the structure of any of the foregoing embodiments, and includes at least a waveguide substrate, a transparent cover plate, and an optical adjustment control unit disposed on the surface of the transparent cover plate. Based on this structure, the optical system can effectively control the leakage light generated during transmission within the waveguide substrate, causing it to deviate from the range of human vision.

[0072] The optical system and near-eye display device provided in this application embodiment have an optical adjustment control on the surface of a transparent cover plate to control the light leaking from the waveguide component to the transparent cover plate 20 side, so that the leaked light is deviated from the range of human eye vision, thereby avoiding stray light, ghost images and information leakage, improving the contrast and clarity of the displayed image, and improving the user experience.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0075] The optical system and near-eye display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical system, characterized in that, The optical system includes: Waveguide components; A transparent cover plate is disposed on the light-emitting side of the waveguide assembly; An optical adjustment control device is disposed on the transparent cover plate; The optical adjustment control is configured to regulate the leaked light from the waveguide assembly to the transparent cover plate side, so that the leaked light is deviated from the range of human vision.

2. The optical system according to claim 1, characterized in that, The optical adjustment control is a diffraction grating; the optical adjustment control is configured to modulate the leaked light to at least one of the following directions: The leaked light is reflected by the diffraction grating to form a first reflected light, which is located outside the preset eye box area; The leaked light is transmitted through the diffraction grating to form first transmitted light, which deviates from the extension direction of the central optical axis of the preset eye box area; The leaked light is coupled into the transparent cover plate through the diffraction grating and forms a second reflected light within the transparent cover plate. The second reflected light then undergoes total internal reflection within the transparent cover plate.

3. The optical system according to claim 2, characterized in that, There is a gap between the waveguide component and the optical tuning control; the refractive index of the optical tuning control is greater than that of air, so that at least a portion of the leaked light undergoes total internal reflection at the interface between the optical tuning control and the air to form the first reflected light.

4. The optical system according to claim 3, characterized in that, The propagation path of the first reflected light satisfies equation (2): tanγ ≥ h / d(2; Wherein, γ is the angle between the first reflected light and the central optical axis of the preset eye box region, h is the distance from the edge of the preset eye box region along the extension direction perpendicular to the central optical axis of the preset eye box region at the reflection point of the first reflected light on the diffraction grating, and d is the distance to the preset eye box region along the extension direction parallel to the central optical axis of the preset eye box region.

5. The optical system according to claim 2, characterized in that, The angle between the first transmitted light and the extension direction of the central optical axis of the preset eye box area is greater than or equal to 45°.

6. The optical system according to claim 2, characterized in that, It also includes a light-absorbing structure disposed inside the optical system and on the optical path of the first reflected light.

7. The optical system according to any one of claims 1 to 6, characterized in that, The waveguide assembly includes a waveguide substrate, an input grating, and an output grating, wherein the projection of the optical modulation control onto the waveguide assembly at least partially coincides with the input grating and / or the output grating.

8. The optical system according to any one of claims 1 to 6, characterized in that, It also includes a frame, which is disposed between the transparent cover plate and the waveguide assembly to fix the transparent cover plate and the waveguide assembly, and the frame is disposed at the edge of the transparent cover plate and the waveguide assembly.

9. The optical system according to any one of claims 1 to 6, characterized in that, The transparent cover has two opposing surfaces in the thickness direction, at least one of which is a curved surface.

10. A near-eye display device, characterized in that, include: An optical engine is used to emit a beam of light that carries image information; An optical system, wherein the optical system is the optical system according to any one of claims 1 to 9, and the optical system is disposed on the light-emitting side of the optical engine.

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