Optical engine for near-eye display, and near-eye display device

Abstract

The present disclosure relates to the technical fields of augmented reality and virtual reality, and provided are an optical engine for a near-eye display and a near-eye display device. The optical engine for a near-eye display comprises: a display chip, which is used for emitting image light; a phase modulator, which is used for performing phase modulation on the image light emitted by the display chip; and a metasurface lens, the metasurface lens having a plurality of phase response regions, at least one phase response region among the plurality of phase response regions being used for receiving the image light that has undergone phase modulation by means of the phase modulator, and generating image light having different emission angles in response to different phases of the phase-modulated image light.

Description

Optical engine for near-eye display and near-eye display device

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202311535642.7 filed on November 17, 2023, entitled “Optical Engine and Near-Eye Display Device for Near-Eye Display,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates to the technical fields of augmented reality and virtual reality, and in particular to an optical engine for near-eye display and a near-eye display device. Background Art

[0004] Augmented reality (AR) is a technology that uses information provided by computer systems to enhance the user's perception of the real world. It applies virtual information to the real world and superimposes computer-generated virtual objects and scenes onto real scenes, thereby enhancing reality. Virtual reality (VR) uses information provided by computer systems to create a virtual world, such as presenting virtual objects and scenes.

[0005] Near-eye display is a display method used in augmented reality and virtual reality devices, such as glasses or head-mounted displays, which is a display method that is close to the eyes. In addition, the optical engine used for near-eye display is an indispensable part of augmented reality or virtual reality devices. However, the visual convergence and accommodation conflict generated by the augmented reality or virtual reality system can cause dizziness and fatigue in the user (especially when the user wears it for a long time). Therefore, there is a need for an optical engine for near-eye display that can alleviate, reduce or eliminate the visual convergence and accommodation conflict.

[0006] Summary of the Invention

[0007] The present disclosure provides an optical engine for near-eye display and a near-eye display device.

[0008] According to one aspect of the present disclosure, an optical engine for near-eye display is provided, the optical engine for near-eye display comprising: a display chip for emitting image light; a phase modulator for phase-modulating the image light emitted by the display chip; and a metasurface lens, the metasurface lens having a plurality of phase response regions, at least one of the plurality of phase response regions being used to receive image light phase-modulated by the phase modulator, and to generate image light with different exit angles in response to different phases of the phase-modulated image light.

[0009] According to another aspect of the present disclosure, a near-eye display device is provided, including: a carrier; and the optical engine provided above according to the present disclosure, wherein the optical engine is disposed on the carrier.

[0010] According to one or more embodiments of the present disclosure, the display of multiple focal planes can be achieved. Multiple focal planes can provide depth information that is closer to the natural light field to alleviate, reduce or eliminate visual convergence and accommodation conflicts, thereby improving the wearing comfort of augmented reality and virtual reality devices.

[0011] These and other aspects of the disclosure will be apparent from and elucidated with reference to the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0013] 1A-1B are schematic diagrams of an optical engine for near-eye display according to some embodiments of the present disclosure;

[0014] FIG2 is a schematic diagram of a metasurface lens imaging a light beam according to some embodiments of the present disclosure;

[0015] FIG3 is a schematic structural diagram of a lithium niobate phase modulator according to some embodiments of the present disclosure;

[0016] FIG4 is a schematic structural diagram of a liquid crystal spatial light modulator according to some embodiments of the present disclosure;

[0017] FIG5 is a schematic diagram of an optical engine for near-eye display according to some other embodiments of the present disclosure;

[0018] FIG6 is a schematic diagram of an optical engine for near-eye display according to some other embodiments of the present disclosure;

[0019] FIG7 is a three-dimensional structural diagram of a near-eye display device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0020] In this disclosure, unless otherwise specified, the use of terms such as "first" and "second" to describe various elements is not intended to limit the positional relationship, temporal relationship, or importance relationship of these elements. Such terms are only used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of the element, while in some cases, based on the context of the description, they may also refer to different instances.

[0021] The terms used in the description of the various examples described in this disclosure are for the purpose of describing specific examples only and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element can be one or more. As used herein, the term "plurality" means two or more, and the term "based on" should be interpreted as "based at least in part on". In addition, the terms "and / or" and "at least one of..." cover any one of the listed items and all possible combinations.

[0022] Near-eye displays (NEDs) are used to create distant virtual images close to the eye and project them into the human eye. In current optical engines for NEDs, vergence-accommodation conflict is the biggest technical challenge in augmented reality and virtual reality, severely impacting the user experience. Vergence-accommodation conflict refers to the inconsistency between the distance information of the observed object reflected by the human eye's vergence and the lens's accommodation. Vergence refers to the degree of convergence of the eyes when viewing an object with both eyes, while accommodation refers to the lens' adjustment to focus the object, ensuring a clear image is received by the retina. Existing AR and VR devices present images of the same object from different angles to the left and right eyes, using the offset between the images seen by both eyes to create a three-dimensional effect. However, these images lack depth information, resulting in a mismatch between the eye's focus accommodation and depth perception. While vergence still accurately reflects the distance information of the virtual object, this creates a vergence-accommodation conflict. To address this conflict, related technologies propose using multiple focal planes to provide depth information closer to that of natural light, thereby alleviating the vergence-accommodation conflict.

[0023] However, existing multi-focal plane display systems have disadvantages such as complex structure, large size and weight, which are not convenient for the manufacture of augmented reality or virtual reality devices.

[0024] In order to achieve multi-focal plane display while effectively reducing the volume and weight of the optical engine, the present disclosure provides an optical engine for near-eye display.

[0025] Exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0026] 1A-1B are schematic diagrams of an optical engine 100 for near-eye display according to some embodiments of the present disclosure; FIG2 is a schematic diagram of a metasurface lens imaging a light beam according to some embodiments of the present disclosure.

[0027] 1A and 1B , an optical engine 100 for near-eye display includes a display chip 110, a phase modulator 120, and a metasurface lens 130. The display chip 110 is configured to emit image light. The phase modulator 120 is configured to phase-modulate the image light emitted by the display chip 110. The metasurface lens 130 has a plurality of phase-responsive regions, at least one of which is configured to receive image light phase-modulated by the phase modulator 120 and generate image light having different emission angles in response to different phases of the phase-modulated image light.

[0028] As shown in Figures 1A and 1B, the display chip 110 is used to generate and modulate two image light groups and transmit the two image light groups to a phase modulator 120 located downstream of the display chip 110. The phase modulator 120 in Figure 1A does not phase-modulate the image light, while the phase modulator 120 in Figure 1B does phase-modulate the image light. Since the phase modulator 120 does not change the exit angle of the image light but only changes the phase of the phase-modulated image light, it can be seen from Figures 1A and 1B that the image light after phase-modulation by the phase modulator 120 is incident on the metasurface lens 130 located downstream of the phase modulator 120 while maintaining the original incident angle. The metasurface lens 130 has multiple phase-responsive regions to deflect the image light after phase-modulation by the phase modulator 120.

[0029] According to some embodiments of the present application, the metasurface lens 130 may include a substrate 150 and a plurality of phase compensation structures 160 on the substrate 150, wherein the plurality of phase compensation structures 160 form the plurality of phase response regions. The phase compensation structures 160 are formed on the transparent substrate 150 using a dielectric material. According to some embodiments of the present application, the phase compensation structures 160 may include solid micro-nano structures such as cuboids, cylinders, and hemispheres, or hollow or partially hollow micro-nano structures having recesses or holes in the shape of cuboids, cylinders, or hemispheres.

[0030] From the comparison between FIG1A and FIG1B , it can be seen that, since the phase modulator 120 in FIG1B performs phase modulation on the image light, although the incident angle of the image light coupled into the metasurface lens 130 does not change, the exit angle of the image light emitted from the metasurface lens 130 changes (the image light emitted from the metasurface lens 130 in FIG1B is obviously more concentrated and converged).

[0031] The specific principle of the combination of the metasurface lens 130 and the phase modulator 120 for application in the optical engine 100 of near-eye display can be seen in Figure 2. As shown in Figure 2, the relationship between the phase of the image light coupled into the metasurface lens 130, the incident angle, and the focal length f is as follows:

[0032]

[0033] Wherein, λ is the wavelength, f is the distance between the sensor 170 and the metasurface lens 130 (i.e., the focal length), f' is the distance traveled by the main ray of the image light passing through the center point of the metasurface lens 130 from the metasurface lens 130 to the sensor 170, Δr is the distance between the phase response area and the intersection of the main ray and the metasurface lens 130, and θ = arccos(f / f').

[0034] It can be seen that the focal length f determines the angle of incidence of the image light emitted from the metasurface lens 130, that is, the deflection angle of the emitted light. In other words, Equation 1 can also represent the relationship between the phase of the incident light, the incident angle of the incident light, and the exit angle of the exit light. Therefore, even if the incident angle of the incident light remains unchanged, the exit angle of the exit light can be changed by changing the phase of the incident light.

[0035] According to the embodiments of the present disclosure, a metasurface lens is used to realize multi-focal plane display, and is combined with a phase modulator (a phase modulator is located between the display chip and the metasurface lens and is used to modulate the phase of the image light emitted by the display chip in real time) and applied to the optical engine of the near-eye display. This can effectively reduce the volume and weight of the optical engine, thereby making the overall structure more compact.

[0036] 1A and 1B , the optical engine 100 may further include an aperture 140 , which is aligned with the metasurface lens 130 and configured to limit image light emitted through the metasurface lens 130 .

[0037] The reason why an aperture is set to limit the image light emitted through the metasurface lens 130 in the optical system is that the image light is often surrounded by stray light. In order to eliminate the influence of stray light on the subsequent optical path, an aperture needs to be added to the optical path to block the stray light and allow the main beam of the image light to pass through.

[0038] According to some embodiments of the present application, the phase modulator 120 can phase modulate the image light emitted by the display chip on a pixel-by-pixel and / or regional pixel basis. According to some embodiments of the present application, the phase modulator 120 can be an active, transparent phase modulator that actively controls the amount of phase change. In such a design, phase compensation can be actively driven and adjusted so that the phase of the image light received by the metasurface lens 130 at different times can be different even at the same position.

[0039] According to some embodiments of the present application, the phase compensation of the phase modulator 120 can vary nonlinearly from the center of the metasurface lens 130 along the radial direction of the metasurface lens 130. In other words, the phase shift variation introduced by the phase compensation of the phase modulator 120 in the directions close to and away from the center of the metasurface lens 130 can be asymmetric.

[0040] According to some embodiments of the present application, the phase modulator 120 can be configured to modulate the phase size of the image light emitted through the display chip 110 according to the radial distance of the position coordinates (x, y) of at least one phase response area among the multiple phase response areas from the center of the metasurface lens 130, so as to adjust the output angle size of the image light emitted through the metasurface lens 130, so as to obtain different focal lengths of the optical engine 100.

[0041] Specifically, at least one phase response region among the plurality of phase response regions receives the image light after phase modulation by the phase modulator 120, and generates image light with different emission angles in response to different phases of the phase modulated image light, satisfying the following relationship:

[0042]

[0043] Wherein, r represents the radial distance between the position coordinate (x, y) of the phase response region and the center of the metasurface lens 130, wherein, represents the phase of the phase-modulated image light at a position with a radial distance r, f represents the focal length, and λ represents the wavelength of the incident phase-modulated image light.

[0044] According to some embodiments of the present application, the display chip 110 includes at least one of an active light-emitting optical display chip or a passive light-emitting optical display chip. For example, the display chip 110 can be an active light-emitting optical display chip such as Micro LED, Micro OLED, or LCD. For another example, the display chip 110 can also be a passive light-emitting optical display chip such as DLP or LCOS (which requires a light source illumination system to be added to the structure). In some embodiments, the display chip 110 is a chip that can provide monochrome or full-color image information.

[0045] According to some embodiments of the present application, in order to achieve real-time display of multiple focal planes, each focal plane needs to have at least 30 frames of images per second. For example, if n display focal planes are required. For monochrome image display, the image refresh rate of the display chip 110 needs to be at least 30n frames, and the frame rate of the phase modulator 120 is the same as the frame rate of the display chip 110, both of which are 30n frames. For color display, since the modulation structure of the metasurface lens 130 and the phase modulator 120 is a function of wavelength, they need to be displayed separately. At this time, the image refresh rate of the display chip 110 needs to be at least 90n frames, and the frame rate of the phase modulator 120 is the same as the frame rate of the display chip 110, which is 90n frames. When the frame rates of the display chip 110 and the phase modulator 120 are sufficient, infinite multiple focal planes can be achieved in theory.

[0046] Further reference is made to FIG. 3 . FIG. 3 is a schematic diagram of the structure of a lithium niobate phase modulator 300 according to some embodiments of the present disclosure. The phase modulator 120 includes the lithium niobate phase modulator 300. The lithium niobate phase modulator 300 includes a substrate 310 and a first electrode 320, a lithium niobate waveguide 330, and a second electrode 340, which are sequentially located on one side of the substrate 310 in a first direction. As shown in FIG. 3 , the first direction is perpendicular to the plane of the substrate 310. Phase modulation of image light emitted by the display chip 110 is performed by adjusting the voltage applied between the first electrode 320 and the second electrode 340.

[0047] According to some embodiments of the present application, the material of substrate 310 includes, but is not limited to, one of silicon, silicon nitride, lithium niobate, aluminum oxide, or sapphire. In the example shown in FIG3 , first electrode 320 and second electrode 340 are disposed opposite each other in a direction perpendicular to the plane of substrate 310, and the electric field generated by first electrode 320 and second electrode 340 is parallel to the first direction.

[0048] The relationship between the phase change amount of the phase modulation performed by the lithium niobate phase modulator 300 and the voltage applied between the first electrode 320 and the second electrode 340 is as follows:

[0049]

[0050] in, is the phase change amount of the phase modulation performed by the lithium niobate phase modulator 300, λ is the wavelength, V is the voltage applied between the first electrode 320 and the second electrode 340, L is the length of the lithium niobate waveguide 330, d is the thickness of the lithium niobate waveguide 330, and C is a material-related constant. Since lithium niobate material has a large C value, it is suitable as an important material for phase modulators.

[0051] Equation 3 represents the relationship between phase change and voltage. By designing the length and thickness of the lithium niobate waveguide 330 and adjusting the voltage applied between the first electrode 320 and the second electrode 340, the phase change of the lithium niobate phase modulator 300 can be adjusted accordingly.

[0052] 3 , in the first direction, the orthographic projection of the lithium niobate waveguide 330 on the substrate 310 is in an array shape. This design can make the arrangement of the lithium niobate waveguide 330 on the substrate 310 more compact.

[0053] Further reference is made to FIG4 . FIG4 is a schematic diagram of the structure of a liquid crystal spatial light modulator 400 according to some embodiments of the present disclosure. The phase modulator 120 includes the liquid crystal spatial light modulator 400. The liquid crystal spatial light modulator 400 includes a liquid crystal layer 410 to phase-modulate image light emitted by the display chip 110 by adjusting the refractive index of the liquid crystal layer 410.

[0054] In the example shown in FIG. 4 , the liquid crystal spatial light modulator 400 may be a sandwich structure (LCOS structure) consisting of an alignment layer 420 , a liquid crystal layer 410 , a conductive electrode (ITO) 430 , and a transparent glass substrate 440 .

[0055] The liquid crystal spatial light modulator 400 modulates the phase of the incident image light by utilizing the birefringence of the liquid crystal molecules 450 in the liquid crystal layer 410. By varying the voltage applied to the liquid crystal molecules 450 by the conductive electrode (ITO) 430, different angles are created between the liquid crystal molecules 450 and the electric field. This creates a specific angle between the pointing vectors of the liquid crystal molecules 450 and the polarization direction of the incident image light, thereby changing the effective refractive index of the liquid crystal layer 410 and, in turn, the optical path length of the light, thereby achieving phase modulation.

[0056] According to an embodiment of the present disclosure, by combining a phase modulator 120 (for example, a lithium niobate phase modulator 300 or a liquid crystal spatial light modulator 400) with a metasurface lens 130, not only can the focusing speed be fast, but also the reliability and accuracy are high.

[0057] Further reference is made to Figures 5 and 6. Figure 5 is a schematic diagram of an optical engine 500 for near-eye display according to other embodiments of the present disclosure; Figure 6 is a schematic diagram of an optical engine 600 for near-eye display according to other embodiments of the present disclosure. In some embodiments, the optical engines 500 and 600 may further include an optical waveguide 510. The optical waveguide 510 is used to guide the image light emitted by the display chip 110 to the metasurface lens 130. In some embodiments, the optical engines 500 and 600 may further include an optical lens group 520. The optical lens group 520 is used to shape the image light emitted by the display chip 110 and is opposite to the input end 530 of the optical waveguide 510 so that the shaped image light can enter the input end 530 of the optical waveguide 510.

[0058] In the example shown in FIG5 , the phase modulator 120 is disposed in the emission path of the display chip 110. The optical lens assembly 520 is disposed in the emission path of the display chip 110 and aligned with the phase modulator 120. The optical waveguide 510 includes an input end 530 and an output end 540. The input end 530 is disposed in the emission path of the display chip 110 and is configured to receive the image light shaped by the optical lens assembly 520, confine the image light within the channel of the optical waveguide 510 through total internal reflection, and emit the shaped image light at the output end 540. The metasurface lens 130 is opposite the output end 540 of the optical waveguide 510 to receive the image light emitted from the optical waveguide 510. The metasurface lens 130 has a plurality of phase-responsive regions, at least one of which is configured to receive the image light emitted from the optical waveguide 510 and generate image light with different emission angles in response to different phases of the emitted image light.

[0059] In the example shown in FIG6 , an optical lens assembly 520 is disposed in the emission path of the display chip 110. An optical waveguide 510 includes an input end 530 and an output end 540. The input end 530, disposed in the emission path of the display chip 110, is configured to receive image light shaped by the optical lens assembly 520, confine the image light within the channel of the optical waveguide 510 through total internal reflection, and emit the shaped image light at the output end 540. A phase modulator 120 is positioned opposite the output end 540 of the optical waveguide 510 to receive the image light emitted from the optical waveguide 510. A metasurface lens 130 is aligned with the phase modulator 120. The metasurface lens 130 has multiple phase-responsive regions, at least one of which is configured to receive image light phase-modulated by the phase modulator 120 and generate image light having different emission angles in response to different phases of the phase-modulated image light.

[0060] The features of the optical engine 500 in FIG5 are substantially the same as those of the optical engine 600 in FIG6 , with the difference being that the phase modulator 120 is disposed between the display chip 110 and the input end 530 of the optical waveguide 510 in the optical engine 500 in FIG5 , while the phase modulator 120 is disposed between the output end 540 of the optical waveguide 510 and the metasurface lens 130 in the optical engine 600 in FIG6 . It should be understood that, in addition to the features described above, other features of the optical engine 500 and the optical engine 600 (e.g., the display chip 110, the phase modulator 120, the metasurface lens 130, etc.) are the same as the corresponding features of the optical engine 100 described in FIG1A-1B , and for the sake of brevity, they are not further described here.

[0061] Further reference is made to Figure 7. Figure 7 is a three-dimensional structural diagram of a near-eye display device 700 of some embodiments of the present disclosure. As shown in Figure 7, the near-eye display device 700 (for example, augmented reality glasses) includes a carrier 710. The carrier 710 may include a frame 720 and a lens 730. The optical engine 100, 500, 600 may be disposed on the carrier 710. According to some embodiments of the present application, the optical engine 100, 500, 600 may be disposed on the carrier 710 in a laminated manner, or may be disposed as an interlayer within the carrier 710. The present disclosure does not place any particular restriction on the manner in which the optical engine 100, 500, 600 is disposed on the carrier 710.

[0062] The embodiment of the present disclosure uses a multi-focal plane display system that combines a metasurface lens with a phase modulator to produce a near-eye display device 700, and sets the optical engines 100, 500, and 600 on a carrier 710, so that the near-eye display device 700 has a simple structure, a small size, and is lightweight, making the near-eye display device 700 similar to the glasses worn by users in daily life, which helps to improve the user experience.

[0063] Although the present disclosure has been illustrated and described in detail in the drawings and the foregoing description, such illustration and description are to be considered illustrative and exemplary and not restrictive; the present disclosure is not limited to the disclosed embodiments. Variations to the disclosed embodiments will be understood and effected by those skilled in the art in practicing the claimed subject matter by studying the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps that are not listed, the indefinite article "a" or "an" does not exclude a plurality, the term "plurality" means two or more, and the term "based on" should be interpreted as "based at least in part on". The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. An optical engine for near-eye display, comprising: Display chip, used to emit image light; A phase modulator, used for performing phase modulation on the image light emitted by the display chip; as well as A metasurface lens, wherein the metasurface lens has a plurality of phase response regions, at least one of the plurality of phase response regions is used to receive image light after phase modulation by the phase modulator, and to generate image light with different emergent angles in response to different phases of the phase modulated image light.

2. The optical engine according to claim 1, further comprising: An aperture is aligned with the metasurface lens and is used to limit the image light emitted through the metasurface lens.

3. The optical engine according to claim 1 or 2, wherein: The phase modulator performs phase modulation on the image light emitted by the display chip on a pixel-by-pixel basis.

4. The optical engine according to claim 1 or 2, wherein: The phase modulator performs phase modulation on the image light emitted by the display chip in a pixel-by-pixel manner.

5. The optical engine according to claim 1 or 2, wherein: The phase compensation of the phase modulator varies nonlinearly from the center of the metasurface lens along the radial direction of the metasurface lens.

6. The optical engine according to claim 1 or 2, wherein: The phase modulator comprises a lithium niobate phase modulator, and the lithium niobate phase modulator comprises: substrate; and A first electrode, a lithium niobate waveguide and a second electrode are sequentially located on one side of the substrate in a first direction, wherein the first direction is perpendicular to the plane where the substrate is located, wherein the image light emitted by the display chip is phase modulated by adjusting the voltage applied between the first electrode and the second electrode.

7. The optical engine according to claim 6, wherein: In the first direction, the orthographic projection of the lithium niobate waveguide on the substrate is in an array shape.

8. The optical engine according to claim 1 or 2, wherein: The phase modulator includes a liquid crystal spatial light modulator, and the liquid crystal spatial light modulator includes a liquid crystal layer, so as to phase-modulate the image light emitted through the display chip by adjusting the refractive index of the liquid crystal layer.

9. The optical engine according to claim 1 or 2, wherein: The phase modulator is configured to modulate the phase size of the image light emitted through the display chip according to the radial distance of the position coordinates (x, y) of at least one phase response area among the multiple phase response areas from the center of the metasurface lens, so as to adjust the exit angle size of the image light emitted through the metasurface lens, so as to obtain different focal lengths of the optical engine.

10. The optical engine according to claim 1 or 2, wherein: The display chip includes at least one of an active light-emitting optical display chip or a passive light-emitting optical display chip.

11. The optical engine according to claim 1 or 2, further comprising: An optical waveguide is used to guide the image light emitted by the display chip to the metasurface lens.

12. The optical engine according to claim 11, further comprising: The optical lens group is used to shape the image light emitted by the display chip and is opposite to the input end of the optical waveguide so that the shaped image light can enter the input end of the optical waveguide.

13. The optical engine according to claim 12, wherein: The phase modulator is arranged in the transmission path of the display chip; The optical lens group is arranged in the emission path of the display chip and is aligned with the phase modulator; The optical waveguide comprises an input end and an output end, wherein the input end is arranged in the emission path of the display chip, and is used to receive the image light shaped by the optical lens group, confine the image light in the channel of the optical waveguide through total internal reflection, and emit the shaped image light at the output end, and The metasurface lens is opposite to the output end of the optical waveguide to receive the image light emitted from the optical waveguide. The metasurface lens has a plurality of phase response regions, at least one of the plurality of phase response regions is used to receive the image light emitted from the optical waveguide, and generate image light with different emission angles in response to different phases of the emitted image light.

14. The optical engine according to claim 12, wherein: The optical lens group is arranged on the emission path of the display chip; The optical waveguide includes an input end and an output end. The input end is arranged in the emission path of the display chip, and is used to receive the image light shaped by the optical lens group, confine the image light in the channel of the optical waveguide through total internal reflection, and emit the shaped image light at the output end. The phase modulator is opposite to the output end of the optical waveguide to receive the image light emitted from the optical waveguide; as well as The metasurface lens is aligned with the phase modulator, and the metasurface lens has a plurality of phase response regions, at least one of the plurality of phase response regions is used to receive image light after phase modulation by the phase modulator, and generate image light with different emergent angles in response to different phases of the phase modulated image light.

15. A near-eye display device, comprising: Carrier; as well as At least one optical engine according to any one of claims 1 to 14, wherein the optical engine is arranged on the carrier.

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