Near-eye display device, optical system, and electronic device

Abstract

The present disclosure relates to a near-eye display device, an optical system and an electronic device, wherein the near-eye display device comprises: a first optical lens and a second optical lens arranged in a stack, the first optical lens having a first outer surface and a first inner surface, the second optical lens having a second outer surface and a second inner surface, the first outer surface being a surface close to an ambient side, the second outer surface being a surface close to a human eye side, at least part of the first outer surface being a curved surface, at least part of the second outer surface being a curved surface, the first inner surface and the second inner surface being both planar surfaces, one surface of at least one of the first optical lens and the second optical lens being provided with an in-coupling grating, and the area where the in-coupling grating is located being planar, and at least one of the first inner surface and the second inner surface being provided with an out-coupling grating.

Description

Technical Field

[0001] This disclosure relates to optical display technology, and more specifically, to a near-eye display device, optical system, and electronic device. Background Technology

[0002] Augmented reality (AR) and mixed reality (MR) technologies are widely used across various industries by combining virtual information with the real world. In corresponding electronic devices, optical waveguides are considered one of the best optical display devices due to their excellent optical performance and low manufacturing complexity. Current technical solutions involve setting coupling gratings and coupling gratings on the optical waveguide, which requires the configuration of corresponding optical waveguide sheets, resulting in high costs. Summary of the Invention

[0003] One object of the present invention is to provide a new technical solution for near-eye display devices.

[0004] According to a first aspect of the present invention, a near-eye display device is provided, comprising: a first optical lens and a second optical lens disposed in superimposed configuration.

[0005] The first optical lens has a first outer surface and a first inner surface, and the second optical lens has a second outer surface and a second inner surface. The first outer surface is the surface closer to the environment, and the second outer surface is the surface closer to the human eye.

[0006] At least a portion of the first outer surface is curved, at least a portion of the second outer surface is curved, and both the first inner surface and the second inner surface are planar.

[0007] A coupling grating is provided on one surface of at least one of the first optical lens and the second optical lens, and the area where the coupling grating is located is a plane. A coupling grating is provided on at least one of the first inner surface and the second inner surface.

[0008] Optionally, when a coupling grating is provided on the first outer surface, the first outer surface has a first plane and a first curved surface, and the coupling grating provided on the first outer surface is provided on the first plane.

[0009] When a coupling grating is provided on the second outer surface, the second outer surface has a second plane and a second curved surface, and the coupling grating provided on the second outer surface is provided on the second plane.

[0010] Optionally, when the first optical lens is provided with an insertion grating and an exit grating, the insertion grating and the exit grating provided on the first optical lens are located on the same surface, or the insertion grating and the exit grating provided on the first optical lens are located on different surfaces.

[0011] When the second optical lens is provided with an input grating and an output grating, the input grating and the output grating provided on the second optical lens are located on the same surface, or the input grating and the output grating provided on the second optical lens are located on different surfaces.

[0012] Optionally, the direction of the light emitted by the optical engine is a first direction or a second direction, and the light emitted by the optical engine cannot pass through a curved surface before entering the coupling grating.

[0013] The first direction is the direction from the environment side to the human eye side, and the second direction is the direction from the human eye side to the environment side.

[0014] Optionally, when both the first optical lens and the second optical lens are provided with coupling gratings, the area corresponding to the coupling grating on the first optical lens and the area corresponding to the coupling grating on the second optical lens partially overlap or completely overlap.

[0015] When both the first inner surface and the second inner surface are provided with coupling gratings, the area corresponding to the coupling grating on the first inner surface and the area corresponding to the coupling grating on the second inner surface partially overlap or completely overlap.

[0016] Optionally, the coupling-in grating is a one-dimensional grating, and the coupling-out grating is a one-dimensional grating; or,

[0017] The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a two-dimensional grating; or...

[0018] The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a mixture of one-dimensional and two-dimensional gratings.

[0019] Optionally, the inner surface on which the coupling grating is provided may also be provided with a folding grating.

[0020] Optionally, the optical power of the first optical lens and the optical power of the second optical lens have opposite signs.

[0021] According to a second aspect of the invention, an optical system is provided, comprising: a near-eye display device as described in any one of the first aspects and an optomechanism, the optomechanism being configured to project light onto the coupling grating.

[0022] According to a third aspect of the present invention, an electronic device is provided, comprising an optical system as described in the second aspect.

[0023] The near-eye display device provided in this embodiment of the invention, on the one hand, the combination of the first optical lens and the second optical lens can realize the functions of vision correction and virtual image distance correction. On the other hand, the coupling grating and the coupling grating are disposed on the first optical lens and / or the second optical lens. The light diffracted by the coupling grating is reflected and propagated in the first optical lens and / or the second optical lens, and then diffracted out by the coupling grating. In this way, the first optical lens and / or the second optical lens realize the function of light reflection of the optical waveguide substrate, eliminating the need to set a separate optical waveguide substrate, saving product costs, and reducing product weight.

[0024] Furthermore, when both the first and second optical lenses are equipped with an input grating and an output grating, light can be diffracted through the input grating on the first optical lens, enter the first optical lens, be reflected and propagated, and then be diffracted through the output grating to enter the user's eye. Similarly, light can be diffracted through the input grating on the second optical lens, enter the second optical lens, be reflected and propagated, and then be diffracted through the output grating to enter the user's eye. This improves optical efficiency, reduces optical loss, and enhances the color uniformity and brightness uniformity of the displayed image, which is equivalent to the display effect achieved by stacking two diffractive waveguides.

[0025] The features and advantages of the embodiments of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of these embodiments.

[0027] Figure 1 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0031] Figure 5 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0032] Figure 6This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0033] Figure 7 This is an exploded view of a near-eye display device according to an embodiment of the present invention. Detailed Implementation

[0034] Various exemplary embodiments of this specification will now be described in detail with reference to the accompanying drawings.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the embodiments of this specification or their application or use.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0037] One embodiment of the present invention provides a near-eye display device. According to... Figure 1 As shown, the near-eye display device includes: a first optical lens 110 and a second optical lens 120 disposed in superposition.

[0038] The first optical lens 110 has a first outer surface 111 and a first inner surface 112. The second optical lens 120 has a second outer surface 121 and a second inner surface 122. The first outer surface 111 is the surface closer to the environment, and the second outer surface 112 is the surface closer to the human eye.

[0039] At least a portion of the first outer surface 111 is curved. At least a portion of the second outer surface 121 is curved. Both the first inner surface 112 and the second inner surface 122 are planar. That is, the first outer surface 111 is entirely curved, or the first outer surface 111 is partially curved and partially planar. The second outer surface 121 is entirely curved, or the second outer surface 121 is partially curved and partially planar.

[0040] A coupling grating is provided on one surface of at least one of the optical lenses, the first optical lens 110 and the second optical lens 120. Figure 1 (Not shown), and the area where the coupling grating is located is planar. At least one of the first inner surface 112 and the second inner surface 122 is provided with an output grating ( Figure 1 (Not shown). Both the input grating and the output grating are set on a plane, which is determined by the setting requirements of the output grating itself.

[0041] When the first optical lens is equipped with a coupling grating, the refractive index of the first optical lens meets a preset requirement, so that light rays diffracted by the coupling grating can propagate through total internal reflection in the first optical lens. When the second optical lens is equipped with a coupling grating, the refractive index of the second optical lens meets a preset requirement, so that light rays diffracted by the coupling grating can propagate through total internal reflection in the second optical lens.

[0042] The first and second optical lenses are stacked together. By adjusting their focal lengths and relative positions, and combining them with the input and output gratings, the light can be precisely propagated, resulting in a clear image.

[0043] The near-eye display device provided in this embodiment of the invention, on the one hand, the combination of the first optical lens and the second optical lens can realize the functions of vision correction and virtual image distance correction. On the other hand, the coupling grating and the coupling grating are disposed on the first optical lens and / or the second optical lens. The light diffracted by the coupling grating is reflected and propagated in the first optical lens and / or the second optical lens, and then diffracted out by the coupling grating. In this way, the first optical lens and / or the second optical lens realize the function of light reflection of the optical waveguide substrate, eliminating the need to set a separate optical waveguide substrate, saving product costs, and reducing product weight.

[0044] Furthermore, when both the first and second optical lenses are equipped with an input grating and an output grating, light can be diffracted through the input grating on the first optical lens, enter the first optical lens, be reflected and propagated, and then be diffracted through the output grating to enter the user's eye. Similarly, light can be diffracted through the input grating on the second optical lens, enter the second optical lens, be reflected and propagated, and then be diffracted through the output grating to enter the user's eye. This improves optical efficiency, reduces optical loss, and enhances the color uniformity and brightness uniformity of the displayed image, which is equivalent to the display effect achieved by stacking two diffractive waveguides.

[0045] In some embodiments, when the first optical lens is provided with a coupling grating, the coupling grating is disposed on the first outer surface, or the coupling grating is disposed on the first inner surface. When the first optical lens is provided with both a coupling grating and a coupling grating, light can be diffracted by the coupling grating onto the first optical lens, reflected, and then diffracted again by the coupling grating to enter the user's eye. This allows the first optical lens to perform the function of reflecting light from the optical waveguide substrate. Furthermore, the placement of the coupling grating is flexible, allowing it to be matched with a variety of optical and structural layouts. When the coupling grating is disposed on the first outer surface, the first outer surface has a first plane and a first curved surface, and the coupling grating disposed on the first outer surface is located on the first plane. This is determined by the requirements of the coupling grating itself.

[0046] In some embodiments, when the second optical lens is provided with a coupling grating, the coupling grating is disposed on the second outer surface, or the coupling grating is disposed on the second inner surface. When the second optical lens is provided with both a coupling grating and a coupling grating, light can be diffracted into the second optical lens via the coupling grating, reflected, and then diffracted out via the coupling grating before entering the user's eye. This allows the second optical lens to perform the function of reflecting light from the optical waveguide substrate. Furthermore, the placement of the coupling grating is flexible, allowing it to be matched with a variety of optical and structural layouts. When the coupling grating is disposed on the second outer surface, the second outer surface has a second plane and a second curved surface, and the coupling grating disposed on the second outer surface is located on the second plane. This is determined by the placement requirements of the coupling grating itself.

[0047] In some embodiments, when the first optical lens is provided with a coupling-in grating and a coupling-out grating, the coupling-in grating and the coupling-out grating on the first optical lens are located on the same surface, that is, both are located on the first inner surface. Alternatively, the coupling-in grating and the coupling-out grating on the first optical lens are located on different surfaces, that is, the coupling-in grating is located on the first outer surface, and the coupling-out grating is located on the first inner surface. When the coupling-in grating is provided on the first outer surface, the first outer surface has a first plane and a first curved surface, and the coupling-in grating on the first outer surface is located on the first plane.

[0048] In some embodiments, when the second optical lens is provided with an insertion grating and an exit grating, the insertion grating and the exit grating on the second optical lens are located on the same surface, i.e., both are located on the second inner surface. Alternatively, the insertion grating and the exit grating on the second optical lens are located on different surfaces, i.e., the insertion grating is located on the second outer surface, and the exit grating is located on the second inner surface. When the insertion grating is located on the second outer surface, the second outer surface has a second plane and a second curved surface, and the insertion grating on the second outer surface is located on the second plane.

[0049] In some embodiments, the direction in which the light emitted by the optomechanism is a first direction or a second direction, and the light emitted by the optomechanism cannot pass through a curved surface before entering the coupling grating. The first direction is the direction from the ambient side to the human eye side, and the second direction is the direction from the human eye side to the ambient side.

[0050] It should be noted that the direction of the light emitted from the optical engine is matched with the setting position of the coupling grating to ensure that the light emitted from the optical engine does not pass through the curved surface before entering the coupling grating.

[0051] For example, the direction of the light emitted by the optical engine is a first direction, and the first outer surface has a first plane and a first curved surface. If no coupling grating is provided on the first plane, then all the light emitted by the optical engine passes through the first plane to ensure that the light emitted by the optical engine cannot pass through the curved surface before entering the coupling grating. If a coupling grating is provided on the first plane, then the light emitted by the optical engine enters the coupling grating and is diffracted.

[0052] For example, the direction of the light emitted by the optical engine is a second direction, and the second outer surface has a second plane and a second curved surface. If no coupling grating is provided on the second plane, then all the light emitted by the optical engine passes through the second plane to ensure that the light emitted by the optical engine does not pass through the curved surface before entering the coupling grating. If a coupling grating is provided on the second plane, then the light emitted by the optical engine enters the coupling grating and is diffracted.

[0053] In some embodiments, when both the first optical lens and the second optical lens are provided with coupling gratings, the regions corresponding to the coupling gratings on the first optical lens and the regions corresponding to the coupling gratings on the second optical lens partially overlap or completely overlap. When both the first inner surface and the second inner surface are provided with coupling gratings, the regions corresponding to the coupling gratings on the first inner surface and the regions corresponding to the coupling gratings on the second inner surface partially overlap or completely overlap. The overlap referred to here is an overlap occurring along the superposition direction of the first and second optical lenses.

[0054] The regions corresponding to the coupling gratings on the first optical lens and the regions corresponding to the coupling gratings on the second optical lens partially or completely overlap, and the regions corresponding to the coupling gratings on the first inner surface and the regions corresponding to the coupling gratings on the second inner surface partially or completely overlap, which can improve optical efficiency and enhance the color uniformity and brightness uniformity of the displayed image.

[0055] In some embodiments, the coupling grating is a one-dimensional grating, and the coupling out grating is a one-dimensional grating.

[0056] In some embodiments, the coupled-in grating is a one-dimensional grating, and the coupled-out grating is a two-dimensional grating.

[0057] In some embodiments, the coupled-in grating is a one-dimensional grating, and the coupled-out grating is a mixture of a one-dimensional grating and a two-dimensional grating.

[0058] A one-dimensional grating couples and diffracts light in a specific direction, effectively controlling the direction of light propagation. A two-dimensional grating can process light in two directions, improving coupling efficiency and allowing more light to be coupled out in the desired direction and angle, thus achieving efficient two-dimensional diffraction.

[0059] Figure 2 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention. Figure 2 As shown, the input grating is a one-dimensional grating, and the output grating is a two-dimensional grating.

[0060] Figure 3 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention. Figure 3 As shown, the input grating is a one-dimensional grating, and the output grating is a mixture of one-dimensional and two-dimensional gratings.

[0061] In some embodiments, the inner surface of the surface with the coupling grating is further provided with a deflection grating. The light first passes through the deflection grating for deflection, and then passes through the coupling grating for coupling out, so as to achieve specific deflection and efficient coupling of the light.

[0062] Figure 4 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention. Figure 4 As shown, the input grating is a one-dimensional grating, the turning grating is a one-dimensional grating, and the output grating is a one-dimensional grating.

[0063] In some embodiments, the optical power of the first optical lens and the optical power of the second optical lens have opposite signs. That is, the optical power of the first optical lens is positive and the optical power of the second optical lens is negative, or the optical power of the first optical lens is negative and the optical power of the second optical lens is positive. An optical lens with positive optical power can converge light, while an optical lens with negative optical power can diverge light. When the first and second optical lenses are stacked, precise propagation of light can be achieved by adjusting their focal lengths and relative positions. They can also cancel out some aberrations, improving image quality. In addition, an optical lens with negative optical power can diverge light, which helps to expand the field of view, allowing a wider range of light to be captured.

[0064] In some embodiments, the curved surfaces of the first optical lens and the second optical lens can be any of the following surface types: spherical, cylindrical, cylindrical superimposed on spherical, or freeform.

[0065] In some embodiments, the first optical lens and the second optical lens are fixed by any of the following methods: optical adhesive bonding, frame bonding, or fastener fixing.

[0066] The near-eye display device provided by the present invention will be described below with reference to several specific embodiments.

[0067] In one embodiment, according to Figure 5 As shown, the near-eye display device includes a first optical lens 110 and a second optical lens 120 stacked together. The first optical lens 110 is a convex lens, and the second optical lens 120 is a concave lens.

[0068] The first optical lens 110 has a first outer surface 111 and a first inner surface 112. The second optical lens 120 has a second outer surface 121 and a second inner surface 122. The first outer surface 111 is the surface closer to the environment. The second outer surface 121 is the surface closer to the human eye. The first outer surface 111 has a first plane 111a and a first curved surface 111b. The second outer surface 121 has a second plane 121a and a second curved surface 121b. The first inner surface 112 and the second inner surface 122 are both planes.

[0069] Both the first plane 111a and the second inner surface 122 are provided with coupling gratings 130. Both the first inner surface 112 and the second inner surface 122 are provided with output gratings 140.

[0070] based on Figure 5 The near-eye display device shown can emit light in either a first direction or a second direction. The first direction is from the environment side to the human eye side, and the second direction is from the human eye side to the environment side.

[0071] based on Figure 5The first optical lens 110 and the second optical lens 120 shown can have one coupling grating 130, for example, it can be disposed on any one of the first plane 111a, the second plane 121a, the first inner surface 112, and the second inner surface 122. The number of coupling gratings 130 can be two, for example, one disposed on any one of the first plane 111a and the first inner surface 112, and the other disposed on any one of the second plane 121a and the second inner surface 122. The number of coupling gratings 140 can be one, for example, it can be disposed on any one of the first inner surface 112 and the second inner surface 122. The number of coupling gratings 140 can be two, for example, they can be disposed on the first inner surface 112 and the second inner surface 122. The specific arrangement of the coupling gratings and the coupling gratings can be arbitrarily combined according to the number and position listed above. It should be noted that, based on the above combination method, Figure 5 The arrangement of the coupling-in grating and coupling-out grating shown is a preferred embodiment. The combination of the first optical lens and the second optical lens can not only achieve vision correction, but also is equivalent to the superposition of two diffractive waveguides, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0072] In one embodiment, according to Figure 6 As shown, the near-eye display device includes a first optical lens 610 and a second optical lens 620 stacked together. The first optical lens 610 is a convex lens, and the second optical lens 620 is a concave lens.

[0073] The first optical lens 610 has a first outer surface 611 and a first inner surface 612. The second optical lens 620 has a second outer surface 621 and a second inner surface 622. The first outer surface 611 is the surface closer to the environment. The second outer surface 621 is the surface closer to the human eye. The first outer surface 611 is entirely curved. The second outer surface 621 has a second plane 621a and a second curved surface 621b. The first inner surface 612 and the second inner surface 622 are both planes.

[0074] Both the first inner surface 612 and the second inner surface 622 are provided with coupling gratings 630. Both the first inner surface 612 and the second inner surface 622 are provided with output gratings 640.

[0075] based on Figure 6 The near-eye display device shown can only emit light in the second direction. The second direction is the direction from the human eye side to the environment side.

[0076] based on Figure 6The first optical lens 610 and the second optical lens 620 shown can have one coupling grating 630, for example, it can be disposed on any one of the second plane 621a, the first inner surface 612, and the second inner surface 622. Alternatively, two coupling gratings 630 can be disposed, for example, one on the first inner surface 612 and the other on either the second plane 621a or the second inner surface 622. Similarly, one coupling grating 640 can be disposed, for example, on either the first inner surface 612 or the second inner surface 622. Alternatively, two coupling gratings 640 can be disposed, for example, on both the first inner surface 612 and the second inner surface 622. The specific arrangement of the coupling gratings and coupling gratings can be arbitrarily combined according to the numbers and positions listed above. It should be noted that, based on the above combinations, Figure 6 The arrangement of the coupling-in grating and coupling-out grating shown is a preferred embodiment. The combination of the first optical lens and the second optical lens can not only achieve vision correction, but also is equivalent to the superposition of two diffractive waveguides, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0077] In one embodiment, according to Figure 7 As shown, the near-eye display device includes a first optical lens 710 and a second optical lens 720 stacked together. The first optical lens 710 is a convex lens, and the second optical lens 720 is a concave lens.

[0078] The first optical lens 710 has a first outer surface 711 and a first inner surface 712. The second optical lens 720 has a second outer surface 721 and a second inner surface 722. The first outer surface 711 is the surface closer to the environment. The second outer surface 721 is the surface closer to the human eye. The first outer surface 711 has a first plane 711a and a first curved surface 711b. The second outer surface 721 is entirely curved. The first inner surface 712 and the second inner surface 722 are both planes.

[0079] Both the first plane 711a and the second inner surface 722 are provided with coupling gratings 730. Both the first inner surface 712 and the second inner surface 722 are provided with output gratings 740.

[0080] based on Figure 7 The near-eye display device shown can only emit light in a first direction. The first direction is the direction from the ambient side to the human eye side.

[0081] based on Figure 7The first optical lens 710 and the second optical lens 720 shown can have one coupling grating 730, for example, it can be disposed on any one of the first plane 711a, the first inner surface 712, and the second inner surface 722. Alternatively, two coupling gratings 730 can be disposed, for example, one on either the second plane 711a or the first inner surface 712, and the other on the second inner surface 722. Similarly, one coupling grating 740 can be disposed, for example, on either the first inner surface 712 or the second inner surface 722. Alternatively, two coupling gratings 740 can be disposed, for example, on the first inner surface 712 and the second inner surface 722. The specific arrangement of the coupling gratings and coupling gratings can be arbitrarily combined according to the numbers and positions listed above. It should be noted that, based on the above combinations, Figure 5 The arrangement of the coupling-in grating and coupling-out grating shown is a preferred embodiment. The combination of the first optical lens and the second optical lens can not only achieve vision correction, but also is equivalent to the superposition of two diffractive waveguides, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0082] One embodiment of the present invention provides an optical system comprising: a near-eye display device as provided in any of the foregoing embodiments and an optomechanism. The optomechanism is used to project light onto a coupling grating. These two parts work together to achieve efficient and high-quality light processing to output a high-quality display image.

[0083] One embodiment of the present invention provides an electronic device. The electronic device includes the optical system provided in any of the above embodiments.

[0084] The electronic device can be any of the following: VR (Virtual Reality) device, AR (Augmented Reality) device, or DLP (Digital Light Processing) device.

[0085] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For the apparatus embodiments, relevant parts can be referred to the descriptions in the method embodiments.

[0086] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. Various embodiments of this specification have been described above; these descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A near-eye display device, characterized in that, include: The first and second optical lenses are superimposed. The first optical lens has a first outer surface and a first inner surface, and the second optical lens has a second outer surface and a second inner surface. The first outer surface is the surface closer to the environment, and the second outer surface is the surface closer to the human eye. At least a portion of the first outer surface is curved, at least a portion of the second outer surface is curved, and both the first inner surface and the second inner surface are planar. A coupling grating is provided on one surface of the first optical lens and on one surface of the second optical lens, and the area where the coupling grating is located is a plane. A coupling grating is provided on both the first inner surface and the second inner surface.

2. The near-eye display device according to claim 1, characterized in that, When a coupling grating is provided on the first outer surface, the first outer surface has a first plane and a first curved surface, and the coupling grating provided on the first outer surface is provided on the first plane; When a coupling grating is provided on the second outer surface, the second outer surface has a second plane and a second curved surface, and the coupling grating provided on the second outer surface is provided on the second plane.

3. The near-eye display device according to claim 1, characterized in that, When the first optical lens is provided with an insertion grating and an exit grating, the insertion grating and the exit grating provided on the first optical lens are located on the same surface, or the insertion grating and the exit grating provided on the first optical lens are located on different surfaces. When the second optical lens is provided with an input grating and an output grating, the input grating and the output grating provided on the second optical lens are located on the same surface, or the input grating and the output grating provided on the second optical lens are located on different surfaces.

4. The near-eye display device according to claim 1, characterized in that, The direction of the light emitted by the optical engine is either a first direction or a second direction, and the light emitted by the optical engine cannot pass through a curved surface before entering the coupling grating. The first direction is the direction from the environment side to the human eye side, and the second direction is the direction from the human eye side to the environment side.

5. The near-eye display device according to claim 1, characterized in that, When both the first optical lens and the second optical lens are provided with coupling gratings, the area corresponding to the coupling grating on the first optical lens and the area corresponding to the coupling grating on the second optical lens partially overlap or completely overlap. When both the first inner surface and the second inner surface are provided with coupling gratings, the area corresponding to the coupling grating on the first inner surface and the area corresponding to the coupling grating on the second inner surface partially overlap or completely overlap.

6. The near-eye display device according to claim 1, characterized in that, The coupling-in grating is a one-dimensional grating, and the coupling-out grating is a one-dimensional grating; or... The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a two-dimensional grating; or... The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a mixture of one-dimensional and two-dimensional gratings.

7. The near-eye display device according to claim 1, characterized in that, The inner surface on which the coupling grating is provided is also provided with a deflection grating.

8. The near-eye display device according to any one of claims 1-7, characterized in that, The optical power of the first optical lens and the optical power of the second optical lens have opposite signs.

9. An optical system, characterized in that, include: The near-eye display device and optical engine as described in any one of claims 1-8, wherein the optical engine is used to project light onto the coupling grating.

10. An electronic device, characterized in that, Includes the optical system as described in claim 9.

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