Optomechanical system and near-eye display device

Abstract

The application is suitable for the field of optical technology, and provides an optical-mechanical system and a near-eye display device. The optical-mechanical system comprises a light source device, a waveguide and a spatial light modulator. The light source device is used for providing image light. The waveguide comprises a coupling-in region and a coupling-out region. The image light is coupled into the waveguide through the coupling-in region, and is coupled out from the coupling-out region after reflection propagation in the waveguide. The spatial light modulator is used for receiving the light coupled out from the waveguide, and performing phase modulation to generate a holographic light field. The image light is transmitted to the spatial light modulator by using the waveguide, so that large-volume devices such as a beam splitter prism are avoided, the volume of the optical-mechanical system is smaller, the structure is compact, the optical-mechanical system is beneficial to be used in the near-eye display device, the volume and weight of the near-eye display device are reduced, and the wearing experience is improved.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an optomechanical system and a near-eye display device. Background Technology

[0002] Augmented Reality (AR) is a cutting-edge display technology that can collect information from the real world in real time and cleverly integrate virtual information and images with real-world scenes. With this unique blend of virtual and real characteristics, AR is expected to become the next generation of information interaction terminals after personal computers and smartphones, possessing extremely broad market prospects and unlimited development potential.

[0003] AR hardware display systems mainly consist of two parts: an optical engine and an optical combiner. The optical engine generates image information, while the optical combiner plays a crucial role—precisely combining the actual ambient light with the image light generated by the optical engine, allowing the human eye to simultaneously and clearly observe both the real environment and the virtual image. To a certain extent, the optical combiner largely determines the overall form of the AR display device. Currently, mature optical combiner solutions on the market include prisms, freeform surfaces, and optical waveguides. Among these solutions, optical waveguide technology stands out, successfully resolving the long-standing inherent contradiction between field of view and size. Whether from the perspective of optical effects, appearance, or mass production prospects, optical waveguides demonstrate enormous development potential.

[0004] In the field of AR 3D display, the current mainstream solution is based on the principle of binocular parallax. Specifically, the wearer's left and right eyes receive different image information from the glasses, utilizing the binocular parallax of the human eye to allow the wearer to perceive the depth information of the image, creating a 3D visual effect. However, this solution has a significant drawback—Vergence-Accommodation Conflict (VAC). The root of this problem is that the image distance perceived through binocular parallax is not consistent with the actual focusing distance of the human eye. This discrepancy often causes discomfort such as dizziness for the wearer. To solve this problem, some solutions use a zoom optical system to adjust the focal plane of the image, but this method leads to a significant increase in system size, making it difficult to meet the design requirements of compact and lightweight AR glasses; other manufacturers have tried to use a dual-focal-plane solution to achieve 3D display. This solution allows the image to exist on two focal planes, mitigating the impact of vergence-accommodation conflict to some extent. However, since the positions of these two focal planes are fixed, the improvement effect is limited, and further increasing the number of focal planes will inevitably lead to an increase in the system size and weight.

[0005] In the ongoing exploration and development of AR technology, the emergence of holographic technology has brought new hope to the industry. With the help of holographic technology, wearers can directly observe realistic 3D images through the transmitted holographic light field. However, this technology currently faces a pressing problem: the holographic light field projection module is too large, a deficiency that severely restricts its application and promotion in wearable devices. For example, the projection module typically uses a beam splitter to fold the light path; the beam splitter itself is large, resulting in a large overall size of the projection module. Utility Model Content

[0006] The purpose of this application is to provide an optomechanical system that aims to provide a solution for reducing the size of a holographic light field projection module.

[0007] The embodiments of this application are implemented as follows: an optomechanical system includes:

[0008] A light source device used to provide light for the image;

[0009] A waveguide, comprising an input region and an output region, wherein the image light is coupled into the waveguide via the input region, and after being reflected and propagated within the waveguide, is coupled out from the output region.

[0010] A spatial light modulator is used to receive light rays coupled from the waveguide and perform phase modulation to generate a holographic light field.

[0011] In one embodiment, the optomechanical system further includes an optical field correction device disposed between the light-emitting side of the waveguide and the spatial light modulator, for modulating the light rays coupled from the waveguide into a Gaussian beam or a plane wave.

[0012] In one embodiment, the transmittance distribution σ(x, y) of the optical field correction device is determined by the normalized distribution of the intensity of an ideal Gaussian beam or plane wave and the optical field intensity distribution of the light rays coupled from the waveguide.

[0013] In one embodiment, the transmittance distribution σ(x, y) of the optical field correction device satisfies:

[0014]

[0015] Where x0 and y0 satisfy: I(x0, y0) = max(I) = 1;

[0016] I(x, y) represents the normalized distribution of the intensity of an ideal Gaussian beam or plane wave, and E(x, y) represents the light field intensity distribution of the light rays coupled out of the waveguide.

[0017] In one embodiment, the phase delay distribution Φ(x,y) of the optical field correction device is equal to the phase distribution of an ideal Gaussian beam or plane wave. The difference between the phase distribution Ψ(x,y) of the optical field of the light rays coupled out of the waveguide.

[0018] In one embodiment, the optical field correction device includes at least one of a diffractive optical element and a metasurface.

[0019] In one embodiment, the spatial light modulator is a transmissive spatial light modulator.

[0020] In one embodiment, the optomechanical system further includes a coupling device disposed in the coupling region of the waveguide for coupling the image light out of the waveguide; the coupling device includes one or more of a prism, a wedge, an array of mirrors, a surface relief grating, and a holographic grating.

[0021] And / or, the optomechanical system further includes a coupling device disposed in the coupling region of the waveguide for coupling the image light into the waveguide; the coupling device includes one or more of a prism, a wedge, an array of mirrors, a surface relief grating, and a holographic grating.

[0022] In one embodiment, the light source device includes an image source and a collimator. The collimator is located on the light-emitting side of the image source. The image source is used to output a light beam corresponding to image information, and the collimator is used to collimate the light beam to emit the image light.

[0023] Another objective of this application is to provide a near-eye display device, which includes the optomechanical system described in the above embodiments.

[0024] The optomechanical system and near-eye display device provided in this application have the following advantages:

[0025] The optomechanical system provided in this application embodiment has a waveguide for receiving image light and coupling it out after propagation within it. A spatial light modulator corresponds to the coupling area of ​​the waveguide and is used to receive the image light coupled out from the waveguide and perform phase modulation to generate a holographic light field. By using the waveguide to propagate the image light to the spatial light modulator, the use of large-volume devices such as beam splitters is avoided, making the optomechanical system smaller and more compact. This is beneficial for use in near-eye display devices, reducing the size and weight of near-eye display devices and improving the wearing experience. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in 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.

[0027] Figure 1 This is a schematic diagram of the structure of the optomechanical system provided in the embodiments of this application;

[0028] Figure 2 This is a simulation diagram of the optical field phase distribution of the optomechanical system provided in this application embodiment before the optical field correction device;

[0029] Figure 3 This is a simulation diagram of the optical field phase distribution of the optomechanical system provided in this application embodiment after the optical field correction device;

[0030] Figure 4 This is a schematic diagram of the optical structure of the near-eye display device provided in the embodiments of this application;

[0031] Figure 5 This is a three-dimensional structural diagram of the near-eye display device provided in the embodiments of this application.

[0032] The markings in the diagram mean:

[0033] 200 - Near-eye display devices;

[0034] 201-Wearing frame, 202-Wearing bracket, 203-Display waveguide combiner;

[0035] 100-Optical-mechanical system;

[0036] 3-Light source device, 31-Image source, 32-Collimator;

[0037] 4-Coupled-in device;

[0038] 5-waveguide, 51-coupled-in region, 52-coupled-out region;

[0039] 6-Coupled-out device;

[0040] 7-Optical field correction devices;

[0041] 8-Spatial light modulator. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0043] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly fixed to or set on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of 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, and therefore should not be construed as a limitation of this patent. The terms "first" and "second" are used only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly specified.

[0044] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be single or multiple. Furthermore, in the description of this application, "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, and c can represent: a, b, c, a+b, a+c, b+c, a+b+c, where a, b, and c can be single or multiple.

[0045] To illustrate the technical solutions described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0046] Please see Figure 1 As shown, this application embodiment provides an optomechanical system 100, which includes a light source device 3, a waveguide 5, and a spatial light modulator 8 arranged sequentially along an optical path. The light source device 3 provides image light. The waveguide 5 is disposed on the light-emitting side of the light source device 3, and includes a coupling-in region 51 and a coupling-out region 52. The coupling-in region 51 corresponds to the light-emitting side of the light source device 3 and is used to receive image light. The coupling-out region 52 is used to couple out the image light inside the waveguide 5; that is, the waveguide 5 receives image light and couples it out after propagation within the waveguide 5. The spatial light modulator 8 corresponds to the coupling-out region 52 and is used to receive the image light coupled out from the waveguide 5 and perform phase modulation on the image light to generate a holographic light field.

[0047] In this embodiment, the image light is transmitted to the spatial light modulator 8 via waveguide 5, avoiding the use of large-volume components such as beam splitters. This results in a smaller and more compact optomechanical system 100, which is beneficial for use in near-eye display devices 200. Please refer to [reference needed]. Figure 4 and Figure 5 As shown, this helps to reduce the size and weight of the near-eye display device 200, and improve the wearing experience.

[0048] like Figure 1 As shown, in one embodiment of this application, the light source device 3 includes an image source 31 and a collimator 32. The collimator 32 is used to collimate the light emitted by the image source 31. In one embodiment, the image light emitted by the light source device 3 is a plane wave. The collimator 32 is located on the light-emitting side of the image source 31. The image source 31 is used to output a light beam corresponding to the image information, and the collimator 32 is used to collimate the light beam and then emit a plane wave, that is, to obtain the plane wave image light. In one embodiment, the image source 31 is a highly coherent laser light source.

[0049] like Figure 1 As shown, in one embodiment of this application, the optomechanical system 100 further includes a coupling device 4, which is disposed on one side of the waveguide 5, specifically corresponding to the coupling region 51 of the waveguide 5. The coupling device 4 is used to couple image light into the waveguide 5. The image light is coupled into the waveguide 5 through the coupling device 4 to propagate within the waveguide 5 at an angle that satisfies the total internal reflection condition. Figure 1 As shown, a portion of the image light reaches the coupling region 52 and is coupled out from the coupling region 52, while another portion of the image light does not meet the coupling condition and continues to propagate in the waveguide 5 in the form of total internal reflection until the coupling condition is met and it is coupled out from the coupling region 52.

[0050] In one embodiment of this application, the specific type and structure of the coupling device 4 are not limited. Optionally, the coupling device 4 includes one or more of the following: prism, wedge, array mirror, surface relief grating, and holographic grating.

[0051] like Figure 1 As shown, in one embodiment of this application, the optomechanical system 100 further includes a coupling device 6, which is disposed between one side of the waveguide 5 and the spatial light modulator 8, specifically disposed in the coupling region 52 of the waveguide 5. The coupling device 6 is used to couple the image light out of the waveguide 5 so that the image light can be further incident on the spatial light modulator 8.

[0052] A portion of the image light reaches the coupling region 52 and is coupled out of the waveguide 5 after being acted upon by the coupling device 6; the other portion of the image light does not meet the coupling conditions and continues to propagate within the waveguide 5 in the form of total internal reflection until the coupling conditions are met and it is coupled out after being acted upon by the coupling device 6. The process of light undergoing multiple total internal reflections within the waveguide 5 is the pupil dilation function of the waveguide 5.

[0053] In one embodiment of this application, the specific type and structure of the coupling device 6 are not limited. Optionally, the coupling device 6 includes one or more of the following: prism, wedge, array mirror, surface relief grating, and holographic grating.

[0054] In one embodiment of this application, the light spot of the image light coupled from the waveguide 5 and the coupling device 6 covers the spatial light modulator 8. That is, the light spot of the image light coupled from the waveguide 5 and the coupling device 6 multiple times is spatially sufficient to cover the spatial light modulator 8, so as to meet the large eyebox and large field of view requirements of the optomechanical system 100. At the same time, the optomechanical system 100 has a relatively thin thickness, and the optomechanical system 100 can be designed to be lightweight and thin.

[0055] In one embodiment of this application, the coupling-in region 51 and the coupling-out region 52 of the waveguide 5 are two different regions of the waveguide 5. In some embodiments, the coupling-out device 6 and the coupling-in device 4 are disposed on opposite side surfaces of the waveguide 5. In other embodiments, the coupling-out device 6 and the coupling-in device 4 may be disposed on the same side surface of the waveguide 5 and spaced apart, so that the coupling-in device 4 and the coupling-out device 6 do not affect each other.

[0056] Based on this, please refer to Figure 1 As shown, in some embodiments of this application, the optomechanical system 100 further includes an optical field correction device 7, which is disposed between the light-emitting side of the waveguide 5 and the spatial light modulator 8. The optical field correction device 7 is used to modulate the light emitted from the waveguide 5 into a Gaussian beam or a plane wave.

[0057] It is understandable that when the image light emitted by the light source device 3 is a plane wave, since actual light sources have a certain size and limited energy distribution, and the image light passes through the coupling device 4, waveguide 5, and coupling device 6, its phase may change to some extent, making it impossible to guarantee equal phase and equal amplitude on the plane perpendicular to the propagation direction. In this case, the image light can be corrected by the optical field correction device 7.

[0058] Specifically, such as Figure 1 As shown, in some embodiments of this application, the optical field correction device 7 is disposed along the optical path between the coupling device 6 and the spatial light modulator 8.

[0059] In this optomechanical system 100, a spatial light modulator 8 modulates the phase of light rays from the coupling device 6, thereby generating a three-dimensional structured light field within a designed depth range. The phase modulation data loaded on the spatial light modulator 8 is called a Computer Generated Hologram (CGH). The CGH can be designed using existing techniques, depending on the desired holographic light field to be generated. Existing design techniques include forward design (based on known analytical phase expressions) and inverse design (based on optimization algorithms, etc.). For any of the above methods, it is necessary that the incident light field on the spatial light modulator 8 is known.

[0060] In some embodiments of this application, to simplify the design, a Gaussian beam or a plane wave is typically chosen as the incident light field of the spatial light modulator 8. That is, the light field correction device 7 is used to modulate the light emitted from the waveguide 5 into a Gaussian beam or a plane wave, which is then incident on the spatial light modulator 8. The spatial light modulator 8 loads phase modulation data onto the beam to generate a holographic light field.

[0061] Generally, in the embodiments of this application, the design goal of the waveguide 5 is usually to ensure that the light rays coupled out of the waveguide 5 have a uniform intensity distribution on the spatial light modulator 8. In the design of the waveguide 5, its coupling efficiency can be obtained by the designer using specialized software to execute a corresponding optimization algorithm. Due to the limited modulation capability of the coupling device 6 and the insufficient convergence of the optimization algorithm, there is room for improvement in the uniformity of the intensity distribution of the coupled light field.

[0062] In some cases, when the image source 31 is a highly coherent laser source, the highly coherent laser emitted by it will interfere when it propagates inside the waveguide 5, which results in a complex phase distribution of the light field of the light coupled out of the waveguide 5.

[0063] like Figure 2 As shown in the phase distribution diagram of the light field coupled from waveguide 5, light rays of all phases in the range of 0 to 2π exist and exhibit a distribution pattern similar to interference fringes. Figure 2 Medium grayscale values ​​from 0 to 255 correspond to phases from 0 to 2π.

[0064] In some embodiments, the phase distribution of the light rays coupled from the coupling device 6 can be compensated in reverse using the CGH information loaded in the spatial light modulator 8. That is, the CGH information loaded in the spatial light modulator 8 includes phase compensation information equal to the phase distribution of an ideal Gaussian beam or plane wave. The difference between the phase distribution Ψ(x,y) of the optical field of the light rays coupled out of waveguide 5.

[0065] like Figure 1As shown, in some embodiments of this application, the phase distribution of the light rays coupled from the coupling device 6 is compensated using the optical field correction device 7.

[0066] Specifically, the optical field correction device 7 is designed such that its phase delay distribution Φ(x,y) is equal to the phase distribution of an ideal Gaussian beam or plane wave. The difference between the phase distribution Ψ(x,y) of the optical field of the light rays coupled out of waveguide 5.

[0067] like Figure 3 As shown, after phase correction by the optical field correction device 7, the phase distribution of the light field incident on the spatial light modulator 8 tends to be uniform.

[0068] In some embodiments of this application, the optical field correction device 7 includes at least one of a diffractive optical element and a metasurface. In some embodiments, the optical field correction device 7 may be composed of one or more diffractive optical elements, or solely composed of one or more metasurfaces, or may be composed of at least one diffractive optical element and at least one metasurface.

[0069] Diffractive optical elements are optical devices that use the principles of light diffraction and interference to control the propagation of light. Their surfaces have microscopic relief structures that cause incident light to diffract. By designing different structural parameters, the diffracted light can produce constructive or destructive interference in specific directions, thereby achieving modulation of the amplitude, phase, and polarization characteristics of light.

[0070] Diffractive optical elements can be fabricated into complex optical structures on a plane using micro-nano fabrication technology, thus having the advantages of being lightweight and small in size, which facilitates system integration and miniaturization.

[0071] A metasurface is a two-dimensional artificial material surface with a subwavelength-scale structure, composed of a large number of subwavelength-sized microstructural units (such as metallic or dielectric nanostructures) arranged in a certain pattern. These structural units can interact with light waves, and by changing the shape, size, orientation, and arrangement of the structural units, the amplitude, phase, polarization, and other properties of the light waves can be precisely controlled. Metasurfaces achieve flexible manipulation of light based on the local scattering and resonance effects of light waves by their microstructures, and their controllability far exceeds the limitations of traditional optical components.

[0072] Metasurfaces typically have thicknesses on the subwavelength order, resulting in extremely small thickness and weight, which is crucial for system integration and miniaturization.

[0073] In the embodiments of this application, the optical field correction device 7 is used to compensate the phase of the incident optical field of the spatial light modulator 8, which can meet the reverse compensation requirements under complex phase distribution conditions.

[0074] The modulation accuracy of diffractive optical elements and metasurfaces depends on their specific fabrication process. Existing fabrication technologies can easily achieve fabrication accuracy at the hundred-nanometer level, such as using electron beam lithography (EBL), focused ion beam (FIB), and femtosecond laser direct writing (DLW). Therefore, the modulation accuracy of these diffractive optical elements and metasurfaces can be achieved, and at the same time, large-scale manufacturing of diffractive optical elements and metasurfaces can also be realized.

[0075] Furthermore, the optical field correction device 7 of the diffractive optical element and / or metasurface can simultaneously achieve amplitude modulation. In this case, the optical field correction device 7 of the diffractive optical element and / or metasurface can simultaneously perform phase modulation and amplitude modulation on the incident light field of the spatial light modulator 8.

[0076] In one embodiment of this application, the transmittance distribution σ(x,y) of the optical field correction device 7 is determined by the normalized distribution of the intensity of an ideal Gaussian beam or plane wave and the optical field intensity distribution of the light rays coupled from the waveguide.

[0077] In one embodiment of this application, the transmittance distribution σ(x, y) of the optical field correction device 7 satisfies:

[0078]

[0079] x0 and y0 satisfy: I(x0, y0) = max(I) = 1;

[0080] Where I(x, y) represents the normalized distribution of the intensity of an ideal Gaussian beam or plane wave, and E(x, y) represents the light field intensity distribution of the light rays coupled out of waveguide 5.

[0081] like Figure 1 As shown, in some embodiments of this application, the spatial light modulator 8 is a transmissive spatial modulation panel. A Gaussian beam or plane wave incident on the spatial light modulator 8 is converted into a holographic light field through transmission from the spatial light modulator 8. Specifically, the spatial light modulator 8 is a liquid crystal spatial light modulator (LC-SLM).

[0082] The purpose of this configuration is that the transmissive spatial modulation panel can reduce the redundant parts in the optical path and shorten the optical path length, thereby achieving a compact structure of the optomechanical system 100. As a result, the volume of the optomechanical system 100 is further reduced, which is beneficial for the use of the optomechanical system 100 in the near-eye display device 200.

[0083] The optomechanical system 100 provided in this application embodiment uses waveguide 5 to provide an input light field for spatial light modulator 8. Specifically, the image light emitted by image source 31 is coupled into waveguide 5 and transmitted to the coupling region 52 of waveguide 5 after total internal reflection. The pupil expansion function of waveguide 5 is used to provide an input light field that matches the area of ​​spatial light modulator 8. Spatial light modulator 8 modulates the phase of the light field coupled from waveguide 5 to generate a holographic light field.

[0084] The optomechanical system 100 provided in this application embodiment provides an optical field correction device 7 between the waveguide 5 and the spatial light modulator 8, so that the light is modulated into a Gaussian beam or a plane wave after passing through the optical field correction device 7 and being incident on the spatial light modulator 8. This solves the problem of uneven intensity of the coupled optical field of the waveguide 5 and the problem of approximately random phase distribution of the coupled optical field caused by interference when the light propagates in the waveguide 5, thereby improving the generation quality of the holographic light field.

[0085] The optomechanical system 100 provided in this application embodiment can generate a high-quality holographic light field while ensuring system compactness, thereby achieving high-quality three-dimensional near-eye display.

[0086] Please see Figure 4 and Figure 5 As shown in the embodiments of this application, a near-eye display device 200 is also provided, which includes the optomechanical system 100 as described in the above embodiments.

[0087] In the near-eye display device 200 of this application embodiment, the above-mentioned optomechanical system 100 has a compact structure and small size, which is beneficial to improving the overall size and weight of the near-eye display device 200 and improving the wearing experience; it can generate a high-quality holographic light field while ensuring the system's compactness, and realize a high-quality three-dimensional near-eye display.

[0088] like Figure 5 As shown, the near-eye display device 200 also includes a wearing frame 201 and a wearing bracket 202. The wearing bracket 202 is connected to the wearing frame 201. The near-eye display device 200 also includes a display waveguide assembler 203, which is disposed on the wearing frame 201 and located in the light-emitting direction of the optomechanical system 100. The display waveguide assembler 203 is used to guide the holographic light field of the optomechanical system 100 to the human eye. In this way, the human eye can receive a three-dimensional holographic light field.

[0089] The near-eye display device 200 in this application embodiment may include smart glasses, virtual reality smart glasses, etc.

[0090] The display waveguide combiner 203 can be a monocular display waveguide or a binocular display waveguide.

[0091] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optomechanical system, characterized by, The light machine system comprises: a light source device for providing image light; a waveguide comprising a coupling-in region and a coupling-out region, the image light being coupled into the waveguide through the coupling-in region and being coupled out from the coupling-out region after being reflected and propagated inside the waveguide; a spatial light modulator for receiving light coupled out from the waveguide and performing phase modulation to generate a holographic light field; a light field correction device disposed between the light exit side of the waveguide and the spatial light modulator, for modulating the light coupled out from the waveguide into a Gaussian light beam or a plane wave; Transmittance distribution of the light field correction device is determined by the normalized distribution of the intensity of an ideal Gaussian beam or a plane wave and the light field intensity distribution of the light rays coupled out of the waveguide.

2. The optomechanical system of claim 1, wherein, The transmittance distribution of the light field correction device satisfies: ； wherein x0and y0satisfy: ; a normalized distribution representing an ideal Gaussian beam or plane wave intensity, represents the light field intensity distribution of the light rays coupled out by the waveguide.

3. The optical engine system of claim 1, wherein, a phase delay distribution Φ(x, y) of the light field correction device is equal to a difference between an ideal Gaussian light beam or plane wave phase distribution φ(x, y) and a light field phase distribution Ψ(x, y) of the light coupled out from the waveguide.

4. The optical engine system of claim 1, wherein, The light field correction device comprises at least one of a diffractive optical element and a metasurface.

5. The optomechanical system of any one of claims 1 to 4, wherein, The spatial light modulator is a transmissive spatial light modulator.

6. The optomechanical system of any one of claims 1 to 4, wherein, The light machine system further comprises a coupling-out device disposed at the coupling-out region of the waveguide, for coupling out the image light from the waveguide; the coupling-out device comprises one or more of a prism, a wedge angle, an array mirror, a surface relief grating, and a holographic grating. And / or, the light machine system further comprises a coupling-in device disposed at the coupling-in region of the waveguide, for coupling the image light into the waveguide; the coupling-in device comprises one or more of a prism, a wedge angle, an array mirror, a surface relief grating, and a holographic grating.

7. The optomechanical system of any one of claims 1 to 4, wherein, The light source device comprises an image source and a collimator, the collimator being located at the light exit side of the image source, the image source being configured to output a light beam corresponding to image information, and the collimator being configured to collimate the light beam to emit the image light.

8. A near-eye display device, comprising: The light machine system comprises any one of claims 1-7. The light machine system comprises any one of claims 1-7.

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