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

Abstract

The invention provides an optical engine for near-eye display and near-eye display equipment, and relates to the technical field of augmented reality and virtual reality. The optical engine for near-to-eye display includes: a display chip for emitting image light; the phase modulator is used for carrying out phase modulation on the image light rays emitted by the display chip; and the metasurface lens is provided with a plurality of phase response areas, and at least one phase response area in the plurality of phase response areas is used for receiving the image light rays subjected to phase modulation by the phase modulator and generating the image light rays with different emergent angles in response to different phases of the image light rays subjected to phase modulation.

Description

Technical Field

[0001] 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

[0002] Augmented Reality (AR) is a technology that uses information provided by a computer system to increase the user's perception of the real world, 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 a computer system to create a virtual world, such as presenting virtual objects and scenes.

[0003] Near-eye display is a display method for augmented reality and virtual reality devices, such as glasses or head-mounted display devices, which is a display method close to the eyes. In addition, the optical engine 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 to the user (especially when the user wears it for a long time). Therefore, an optical engine for near-eye display that alleviates, reduces or eliminates the visual convergence and accommodation conflict is needed. Summary of the invention

[0004] The present disclosure provides an optical engine for near-eye display and a near-eye display device.

[0005] 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 after phase modulation by the phase modulator, and generating image light with different emergent angles in response to different phases of the phase modulated image light.

[0006] According to another aspect of the present disclosure, a near-eye display device is provided, and the near-eye display device includes: a carrier; and an optical engine as provided above according to the present disclosure, wherein the optical engine is disposed on the carrier.

[0007] According to one or more embodiments of the present disclosure, the display of multiple focal planes can be realized, and the multiple focal planes can provide depth information that is closer to the natural light field to alleviate, reduce or eliminate the visual convergence and accommodation conflict, thereby improving the wearing comfort of augmented reality and virtual reality devices.

[0008] 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

[0009] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0010] Figure 1A-1B is a schematic diagram of an optical engine for near-eye display according to some embodiments of the present disclosure;

[0011] Figure 2 Schematic diagram of a metasurface lens imaging a light beam according to some embodiments of the present disclosure;

[0012] Figure 3 A schematic diagram of the structure of a lithium niobate phase modulator according to some embodiments of the present disclosure;

[0013] Figure 4 It is a schematic diagram of the structure of a liquid crystal spatial light modulator according to some embodiments of the present disclosure;

[0014] Figure 5 Schematic diagram of an optical engine for near-eye display according to some other embodiments of the present disclosure;

[0015] Figure 6 Schematic diagram of an optical engine for near-eye display according to some other embodiments of the present disclosure;

[0016] Figure 7 This is a three-dimensional structural diagram of a near-eye display device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0017] In the present disclosure, unless otherwise specified, the use of the terms "first", "second", etc. to describe various elements is not intended to limit the positional relationship, timing relationship, or importance relationship of these elements, and such terms are only used to distinguish one element from another element. In some examples, the first element and the second element may refer to the same instance of the element, and in some cases, based on the description of the context, they may also refer to different instances.

[0018] The terms used in the description of various examples described in this disclosure are only for the purpose of describing specific examples 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.

[0019] Near-eye display is used to form a distant virtual image close to the eye and project it into the human eye. In the current optical engine for near-eye display, visual convergence and accommodation conflict is the biggest technical problem in augmented reality and virtual reality, which seriously affects the user experience. Among them, visual convergence and accommodation conflict refers to the conflict between the distance information of the observed target reflected by the convergence of the human eye and the accommodation of the lens. Human eye convergence refers to the degree of convergence of the eyeball when a person observes a target with both eyes, and lens accommodation refers to the focus of the lens adjustment when the human eye observes the target to ensure that the retina receives a clear image. Existing augmented reality and virtual reality devices are all by displaying pictures of the same object taken from different angles to the left and right eyes, and using the image offset seen by both eyes to present a three-dimensional feeling, but these pictures do not have depth information, so the focus adjustment of the eyes does not match the depth sense, and the convergence of the human eye still truly reflects the distance information of the virtual target, resulting in visual convergence and accommodation conflict. In order to solve the visual convergence and accommodation conflict, the relevant technology proposes to provide depth information closer to the natural light field through multiple focal planes, thereby alleviating the visual convergence and accommodation conflict.

[0020] However, existing multi-focal plane display systems have disadvantages such as complex structure, large size and weight, which are not convenient for manufacturing augmented reality or virtual reality devices.

[0021] In order to effectively reduce the volume and weight of an optical engine while realizing multi-focal plane display, the present disclosure provides an optical engine for near-eye display.

[0022] Exemplary embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0023] Figure 1A-1B is a schematic diagram of an optical engine 100 for near-eye display according to some embodiments of the present disclosure; Figure 2 Schematic diagram of imaging a light beam by a metasurface lens according to some embodiments of the present disclosure.

[0024] refer to Figure 1A and Figure 1BThe 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 used to emit image light. The phase modulator 120 is used to phase modulate the image light emitted by the display chip 110. The metasurface lens 130 has a plurality of phase response regions, at least one of the plurality of phase response regions is used to receive the image light after phase modulation by the phase modulator 120, and generate image light with different exit angles in response to different phases of the phase modulated image light.

[0025] like Figure 1A and Figure 1B As shown in , the display chip 110 is used to generate and modulate two image light groups, and transmit the two image light groups to the phase modulator 120 located downstream of the display chip 110 . Figure 1A The phase modulator 120 in FIG. 1 does not perform phase modulation on the image light. Figure 1B The phase modulator 120 in the image light performs phase modulation on the image light. Since the phase modulator 120 performs phase modulation on the image light without changing the emission angle of the image light, but only changes the phase of the image light after the phase modulation, Figure 1A and Figure 1B As can be seen in FIG, 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 a plurality of phase response regions to deflect the image light after phase modulation by the phase modulator 120.

[0026] 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, and the plurality of phase compensation structures 160 form the plurality of phase response regions. The phase compensation structure 160 is formed by a dielectric material on the transparent substrate 150. According to some embodiments of the present application, the phase compensation structure 160 may include a solid micro-nano structure such as a cuboid, a column, a hemisphere, or a hollow or partially hollow micro-nano structure having a concave or hole of a cuboid, a column, or a hemisphere.

[0027] from Figure 1A and Figure 1B It can be seen from the comparison that due to Figure 1B The phase modulator 120 in the embodiment 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 ( Figure 1B The image light emitted from the metasurface lens 130 is significantly more concentrated and converged).

[0028] For details about the principle of the combination of the metasurface lens 130 and the phase modulator 120 for application in the optical engine 100 for near-eye display, please refer to Figure 2 .like Figure 2 As shown, 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:

[0029]

[0030] 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 from the phase response area to the intersection of the main ray and the metasurface lens 130, and θ=arccos(f / f').

[0031] 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 characterize the relationship between the phase of the incident light, the incident angle of the incident light, and the exit angle of the emitted light. Therefore, even if the incident angle of the incident light remains unchanged, the exit angle of the emitted light can be changed by changing the phase of the incident light.

[0032] 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 a display chip and a metasurface lens and is used to modulate the phase of image light emitted by the display chip in real time) and applied to an optical engine of a near-eye display. This can effectively reduce the volume and weight of the optical engine, thereby making the overall structure more compact.

[0033] Continue to refer to Figure 1A and Figure 1B The optical engine 100 may further include an aperture 140 . The aperture 140 is aligned with the metasurface lens 130 and is used to limit the image light emitted through the metasurface lens 130 .

[0034] 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.

[0035] According to some embodiments of the present application, the phase modulator 120 can phase modulate the image light emitted by the display chip pixel by pixel and / or by region. 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, the 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.

[0036] 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.

[0037] 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.

[0038] Specifically, at least one of the multiple 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:

[0039]

[0040] Wherein, r represents the radial distance of the position coordinate (x, y) of the phase response region from the center of the metasurface lens 130, wherein, represents the phase of the phase-modulated image light at the position with a radial distance of r, f represents the focal length, and λ represents the wavelength of the incident phase-modulated image light.

[0041] 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 may be an active light-emitting optical display chip such as Micro LED, Micro OLED, LCD, etc. For another example, the display chip 110 may also be a passive light-emitting optical display chip such as DLP, LCOS, etc. (a light source illumination system needs 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.

[0042] According to some embodiments of the present application, in order to realize 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 the 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.

[0043] Further references Figure 3 . Figure 3 1 is a schematic diagram of the structure of a lithium niobate phase modulator 300 of some embodiments of the present disclosure. The phase modulator 120 includes a 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 sequentially located on one side of the substrate 310 in a first direction. Figure 3 As shown, the first direction is perpendicular to the plane where the substrate 310 is located. The image light emitted by the display chip 110 is phase modulated by adjusting the voltage applied between the first electrode 320 and the second electrode 340 .

[0044] According to some embodiments of the present application, the material of the substrate 310 includes but is not limited to one of silicon, silicon nitride, lithium niobate, aluminum oxide or sapphire. Figure 3 In the example shown, the first electrode 320 and the second electrode 340 are disposed opposite to each other in a direction perpendicular to the plane where the substrate 310 is located, and the electric field generated by the first electrode 320 and the second electrode 340 is parallel to the first direction.

[0045] 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:

[0046]

[0047] 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 constant related to the material. Since the C value of the lithium niobate material is very large, it is suitable for use as an important material for the phase modulator.

[0048] 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 phase modulation of the lithium niobate phase modulator 300 can be adjusted accordingly.

[0049] Continue to refer to Figure 3 In the first direction, the orthographic projection of the lithium niobate waveguide 330 on the substrate 310 is in an array shape. In such a design, the arrangement of the lithium niobate waveguide 330 on the substrate 310 can be made more compact.

[0050] Further references Figure 4 . Figure 4 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 a liquid crystal spatial light modulator 400. The liquid crystal spatial light modulator 400 includes a liquid crystal layer 410, so as to phase modulate image light emitted by the display chip 110 by adjusting the refractive index of the liquid crystal layer 410.

[0051] exist Figure 4 In the example shown, 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.

[0052] The liquid crystal spatial light modulator 400 realizes the phase modulation of the incident image light through the birefringence of the liquid crystal molecules 450 of the liquid crystal layer 410. By changing the voltage applied to the liquid crystal molecules 450 by the conductive electrode (ITO) 430, there will be different angles between the liquid crystal molecules 450 and the electric field, that is, the pointing vector of the liquid crystal molecules 450 and the polarization direction of the incident image light form a certain angle, thereby changing the effective refractive index of the liquid crystal layer 410, and then changing the size of the optical path of the light, thereby achieving the purpose of phase modulation.

[0053] 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 a fast focusing speed but also high reliability and precision can be achieved.

[0054] Further references Figure 5 and Figure 6 . Figure 5 Schematic diagram of an optical engine 500 for near-eye display according to some other embodiments of the present disclosure; Figure 6Schematic diagram of an optical engine 600 for near-eye display in some other embodiments of the present disclosure. In some embodiments, the optical engine 500, 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 engine 500, 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.

[0055] exist Figure 5 In the example shown, the phase modulator 120 is disposed in the emission path of the display chip 110. The optical lens group 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 used to receive the image light shaped by the optical lens group 520, confine the image light in the channel of the optical waveguide 510 by total internal reflection, and emit the shaped image light at the output end 540. The metasurface lens 130 is opposite to 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 response regions, at least one of the plurality of phase response regions is used 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.

[0056] exist Figure 6 In the example shown, the optical lens group 520 is disposed in the emission path of the display chip 110. The optical waveguide 510 includes an input end 530 and an output end 540, wherein the input end 530 is disposed in the emission path of the display chip 110, and is used to receive the image light shaped by the optical lens group 520, confine the image light in the channel of the optical waveguide 510 by total internal reflection, and emit the shaped image light at the output end 540. The phase modulator 120 is opposite to the output end 540 of the optical waveguide 510 to receive the image light emitted from the optical waveguide 510. The metasurface lens 130 is aligned with the phase modulator 120, and the metasurface lens 130 has a plurality of phase response regions, at least one of the plurality of phase response regions is used to receive the image light phase-modulated by the phase modulator 120, and generate image light with different emission angles in response to different phases of the phase-modulated image light.

[0057] in, Figure 5 The characteristics of the optical engine 500 are Figure 6 The features of the optical engine 600 in are basically the same, the difference between the two is that, Figure 5 The optical engine 500 in the embodiment of the present invention arranges the phase modulator 120 between the display chip 110 and the input end 530 of the optical waveguide 510, and Figure 6 The optical engine 600 in the embodiment of the present invention arranges the phase modulator 120 between the output end 540 of the optical waveguide 510 and the metasurface lens 130. 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.) can be used in conjunction with the optical engine 600. Figure 1A-1B The corresponding features of the optical engine 100 described in are the same and will not be described in detail here for the sake of brevity.

[0058] Further references Figure 7 . Figure 7 FIG. 7 is a three-dimensional structural diagram of a near-eye display device 700 according to some embodiments of the present disclosure. Figure 7 As shown, a near-eye display device 700 (e.g., 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 sheet. The present disclosure does not particularly limit the manner in which the optical engine 100, 500, 600 is disposed on the carrier 710.

[0059] The embodiment of the present disclosure manufactures a near-eye display device 700 by using a multi-focal plane display system that uses a metasurface lens in conjunction with a phase modulator, and arranges 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 that users wear daily, which helps to improve user experience.

[0060] Although the present disclosure has been illustrated and described in detail in the drawings and the foregoing description, such illustration and description should be considered illustrative and schematic, not restrictive; the present disclosure is not limited to the disclosed embodiments. By studying the drawings, the disclosure and the appended claims, those skilled in the art will be able to understand and implement variations to the disclosed embodiments when practicing the claimed subject matter. 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 recorded 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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