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, comprising: a first optical lens, a light waveguide sheet and a second optical lens which are sequentially stacked, the first optical lens has a first outer surface and a first inner surface, the light waveguide sheet has a first plane and a second plane, the second optical lens has a second outer surface and a second inner surface, at least part of the first outer surface is a curved surface, at least part of the second outer surface is a curved surface, at least one of the first inner surface and the second inner surface is a plane, one surface of at least one of the first optical lens and the second optical lens is provided with a coupling-in grating, at least one of the first plane and the second plane is provided with a coupling-in grating, a coupling-out grating is arranged on at least one of the first inner surface and the second inner surface, the inner surface where the coupling-out grating is arranged is a plane, and a coupling-out grating is arranged on at least one of the first plane and the second plane.

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 all involve setting coupling gratings and coupling gratings on the optical waveguide.

[0003] To improve the display effect, the current technical solution is to add optical waveguide sheets. This method will increase the cost and the weight of the equipment. Summary of the Invention

[0004] One object of the present invention is to provide a new technical solution for near-eye display devices.

[0005] According to a first aspect of the present invention, a near-eye display device is provided, comprising: a first optical lens, an optical waveguide sheet, and a second optical lens disposed sequentially.

[0006] The first optical lens has a first outer surface and a first inner surface, the optical waveguide has a first plane and a second plane, 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, the second outer surface is the surface closer to the human eye, the first plane is adjacent to the first inner surface, and the second plane is adjacent to the second inner surface.

[0007] At least a portion of the first outer surface is curved, at least a portion of the second outer surface is curved, and at least one of the first inner surface and the second inner surface is a plane.

[0008] A coupling grating is disposed on one surface of at least one of the first optical lens and the second optical lens, and a coupling grating is disposed on at least one of the first plane and the second plane.

[0009] A coupling grating is provided on at least one of the first inner surface and the second inner surface, and the inner surface where the coupling grating is located is a plane, and the coupling grating is provided on at least one of the first plane and the second plane.

[0010] Optionally, when a coupling grating is provided on the first outer surface, the first outer surface has a planar portion and a curved portion, and the coupling grating provided on the first outer surface is provided on the planar portion of the first outer surface;

[0011] When a coupling grating is provided on the second outer surface, the second outer surface has a planar portion and a curved portion, and the coupling grating provided on the second outer surface is provided on the planar portion of the second outer surface.

[0012] 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.

[0013] When the optical waveguide sheet is provided with an insertion grating and an output grating, the insertion grating and the output grating provided on the optical waveguide sheet are located on the same surface, or the insertion grating and the output grating provided on the optical waveguide sheet are located on different surfaces.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] Optionally, when the direction of the light emitted by the optical engine is a first direction, the first outer surface has a planar portion, such that all the light emitted by the optical engine passes through the planar portion of the first outer surface, or, such that the light emitted by the optical engine is diffracted by a coupling grating disposed on the planar portion of the first outer surface.

[0018] When the direction of the light emitted by the optical engine is the second direction, the second outer surface has a planar portion, such that all the light emitted by the optical engine passes through the planar portion of the second outer surface, or such that the light emitted by the optical engine is diffracted by a coupling grating disposed on the planar portion of the second outer surface.

[0019] Optionally, when the direction of the light emitted by the optical engine is a first direction and the first outer surface is a fully curved surface, the size of the first optical lens is smaller than the size of the optical waveguide, so that the light emitted by the optical engine directly enters the optical waveguide, or the light emitted by the optical engine is directly diffracted by the coupling grating disposed on the first plane.

[0020] When the direction of the light emitted by the optical engine is the second direction and the second outer surface is entirely curved, the size of the second optical lens is smaller than the size of the optical waveguide, so that the light emitted by the optical engine directly enters the optical waveguide, or the light emitted by the optical engine is directly diffracted by the coupling grating disposed on the second plane.

[0021] Optionally, the regions corresponding to each coupled grating may partially or completely overlap along the direction of the superposition setting;

[0022] The regions corresponding to each coupled grating partially or completely overlap along the direction of the superposition setting.

[0023] Optionally, the coupling-in grating is a one-dimensional grating, and the coupling-out grating is a one-dimensional grating; or,

[0024] The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a two-dimensional grating; or...

[0025] The coupled-in grating is a one-dimensional grating, and the coupled-out grating is a mixture of one-dimensional and two-dimensional gratings.

[0026] Optionally, the inner surface on which the coupling grating is provided may also be provided with a folding grating.

[0027] Optionally, the optical power of the first optical lens and the optical power of the second optical lens have opposite signs.

[0028] 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.

[0029] According to a third aspect of the present invention, an electronic device is provided, comprising an optical system as described in the second aspect.

[0030] The near-eye display device provided in this invention not only sets coupling gratings and coupling gratings on the optical waveguide sheet, but also sets coupling gratings and coupling gratings on the optical lens. Light can be diffracted through the coupling grating on the optical waveguide sheet and enter the first optical lens for reflection and propagation, and then diffracted through the coupling grating on the optical waveguide sheet to enter the user's eye. Light can also be diffracted through the coupling grating on the optical lens and enter the optical lens for reflection and propagation, and then diffracted through the coupling grating to enter the user's eye. In this way, the first or second optical lens can realize the function of light reflection from the optical waveguide substrate. The display effect achieved by stacking two diffractive optical waveguides can be achieved without setting a separate optical waveguide substrate, saving product costs and reducing product weight. In terms of display effect, it improves optical efficiency, reduces optical loss, and improves the color uniformity and brightness uniformity of the displayed image. In addition, the combination of the first and second optical lenses can realize the functions of vision correction and virtual image distance correction.

[0031] 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

[0032] 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.

[0033] Figure 1 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention.

[0037] Figure 5 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0038] Figure 6 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0039] Figure 7 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0040] Figure 8 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0041] Figure 9 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0042] Figure 10 This is an exploded view of a near-eye display device according to an embodiment of the present invention.

[0043] Figure 11 This is an exploded view of a near-eye display device according to an embodiment of the present invention. Detailed Implementation

[0044] Various exemplary embodiments of this specification will now be described in detail with reference to the accompanying drawings.

[0045] 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.

[0046] 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.

[0047] 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, an optical waveguide 120, and a second optical lens 130, which are stacked sequentially.

[0048] The first optical lens 110 has a first outer surface 111 and a first inner surface 112. The optical waveguide 120 has a first plane 121 and a second plane 122. The second optical lens 130 has a second outer surface 131 and a second inner surface 132. The first outer surface 111 is the surface closer to the environment. The second outer surface 131 is the surface closer to the human eye. The first plane 121 is adjacent to the first inner surface 112, and the second plane 122 is adjacent to the second inner surface 132.

[0049] At least a portion of the first outer surface 111 is curved. At least a portion of the second outer surface 131 is curved. 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 131 is entirely curved, or the second outer surface 131 is partially curved and partially planar. At least one of the first inner surface 112 and the second inner surface 132 is planar.

[0050] A coupling grating is disposed on one surface of at least one of the first optical lens 110 and the second optical lens 130, and a coupling grating is disposed on at least one of the first plane 121 and the second plane 122. The coupling grating involved herein is... Figure 1 It is not shown in the text.

[0051] A coupling grating is disposed on at least one of the first inner surface 112 and the second inner surface 132, and the inner surface on which the coupling grating is disposed is planar. A coupling grating is disposed on at least one of the first plane 121 and the second plane 122. When both the first inner surface 112 and the second inner surface 132 are planar, a coupling grating is disposed on at least one of the first inner surface 112 and the second inner surface 132. When only one of the first inner surface 112 and the second inner surface 132 is planar, a coupling grating is disposed on the planar inner surface.

[0052] The coupling grating involved here is Figure 1 It is not shown in the figure. It should be noted that the coupling grating is set on a plane, which is determined by the setting requirements of the coupling grating itself.

[0053] The refractive index of the first optical lens meets a preset requirement so that light rays entering through the coupling grating can undergo total internal reflection within the first optical lens. The refractive index of the second optical lens meets a preset requirement so that light rays entering through the coupling grating can undergo total internal reflection within the second optical lens.

[0054] 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.

[0055] The near-eye display device provided in this invention not only sets coupling gratings and coupling gratings on the optical waveguide sheet, but also sets coupling gratings and coupling gratings on the optical lens. Light can be diffracted through the coupling grating on the optical waveguide sheet and enter the first optical lens for reflection and propagation, and then diffracted through the coupling grating on the optical waveguide sheet to enter the user's eye. Light can also be diffracted through the coupling grating on the optical lens and enter the optical lens for reflection and propagation, and then diffracted through the coupling grating to enter the user's eye. In this way, the first or second optical lens can realize the function of light reflection from the optical waveguide substrate. The display effect achieved by stacking two diffractive optical waveguides can be achieved without setting a separate optical waveguide substrate, saving product costs and reducing product weight. In terms of display effect, it improves optical efficiency, reduces optical loss, and improves the color uniformity and brightness uniformity of the displayed image. In addition, the combination of the first and second optical lenses can realize the functions of vision correction and virtual image distance correction.

[0056] In some embodiments, when a coupling grating is provided on the first optical lens, 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 a coupling grating is provided on the first outer surface, the first outer surface has a planar portion and a curved portion, and the coupling grating is disposed on the planar portion of the first outer surface. This is determined by the placement requirements of the coupling grating itself.

[0057] 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 by the coupling grating onto the second optical lens, reflected, and then diffracted again by 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 planar portion and a curved portion, and the coupling grating disposed on the planar portion of the second outer surface. This is determined by the placement requirements of the coupling grating itself.

[0058] 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 located on the first outer surface, the first outer surface has a planar portion and a curved portion, and the coupling-in grating on the first outer surface is located on the planar portion of the first outer surface. The combination of coupling-in gratings and coupling-out gratings provides flexibility to accommodate a variety of optical and structural layouts.

[0059] In some embodiments, when the optical waveguide sheet is provided with coupling-in gratings and coupling-out gratings, the coupling-in gratings and coupling-out gratings on the optical waveguide sheet are located on the same surface, i.e., both are located on the first plane, or both are located on the second plane. Alternatively, the coupling-in gratings and coupling-out gratings on the optical waveguide sheet are located on different surfaces, i.e., the coupling-in grating is located on the first plane and the coupling-out grating is located on the second plane, or the coupling-in grating is located on the second plane and the coupling-out grating is located on the first plane. The combination of coupling-in gratings and coupling-out gratings provides flexibility to accommodate a variety of optical and structural layouts.

[0060] 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 are located on the same surface, i.e., both are located on the second inner surface. Alternatively, the insertion grating and the exit grating 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 planar portion and a curved portion, and the insertion grating is located on the planar portion of the second outer surface. The combination of insertion and exit gratings provides flexibility to accommodate a wider range of optical and structural layouts.

[0061] 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.

[0062] 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.

[0063] For example, the direction of the light emitted by the optical engine is a first direction, and the first outer surface has a planar portion. If no coupling grating is provided on this planar portion, then all the light emitted by the optical engine passes through the planar portion of the first outer surface, ensuring that the light emitted by the optical engine does not pass through a curved surface before entering the coupling grating. If a coupling grating is provided on this planar portion, then the light emitted by the optical engine is diffracted by the coupling grating provided on the planar portion of the first outer surface.

[0064] For example, the direction of the light emitted by the optical engine is a second direction, and the second outer surface has a planar portion. If no coupling grating is provided on this planar portion, then all the light emitted by the optical engine passes through the planar portion of the second outer surface, ensuring 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 this planar portion, then the light emitted by the optical engine is diffracted by the coupling grating provided on the planar portion of the second outer surface.

[0065] For example, when the direction of the light emitted from the optical engine is a first direction and the first outer surface is entirely curved, the size of the first optical lens is smaller than the size of the optical waveguide, so that the light emitted from the optical engine directly enters the optical waveguide, or so that the light emitted from the optical engine is directly diffracted by a coupling grating disposed on the first plane. The size involved here is the projected size perpendicular to the optical waveguide.

[0066] For example, when the direction of the light emitted from the optical engine is the second direction, and the second outer surface is entirely curved, the size of the second optical lens is smaller than the size of the optical waveguide, allowing the light emitted from the optical engine to directly enter the optical waveguide, or allowing the light emitted from the optical engine to be diffracted directly by a coupling grating disposed on the second plane. The size involved here refers to the projected size perpendicular to the optical waveguide.

[0067] In some embodiments, the regions corresponding to each coupled-in grating partially or completely overlap along the direction corresponding to the superposition. The regions corresponding to each coupled-out grating partially or completely overlap along the direction corresponding to the superposition.

[0068] When the first plane and the second plane are parallel to each other, the superimposed direction is set to be perpendicular to the first plane and the second plane.

[0069] The regions corresponding to the coupling gratings on the optical lens and the regions corresponding to the coupling gratings on the optical waveguide sheet partially or completely overlap, as well as the regions corresponding to the coupling gratings on the optical lens and the regions corresponding to the coupling gratings on the optical waveguide sheet partially or completely overlap, which can improve optical efficiency and enhance the color uniformity and brightness uniformity of the displayed image.

[0070] In some embodiments, the coupling grating is a one-dimensional grating, and the coupling out grating is a one-dimensional grating.

[0071] In some embodiments, the coupled-in grating is a one-dimensional grating, and the coupled-out grating is a two-dimensional grating.

[0072] 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.

[0073] 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.

[0074] Figure 2 This is a schematic diagram of an input grating and an output grating according to an embodiment of the present invention. Figure 2As shown, the input grating is a one-dimensional grating, and the output grating is a two-dimensional grating.

[0075] 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.

[0076] In some embodiments, the inner surface of the coupled-out grating is further provided with a deflection grating. The light first passes through the deflection grating for deflection, and then passes through the coupled-out grating for coupling out, so as to achieve specific deflection and efficient coupling of the light.

[0077] 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.

[0078] 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.

[0079] The specific settings of the optical power values ​​of the first and second optical lenses are based on the visual acuity to be corrected. Visual acuity correction is achieved through the combination of the first and second optical lenses, rather than relying solely on one of the optical lenses.

[0080] 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.

[0081] 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.

[0082] The near-eye display device provided by the present invention will be described below with reference to several specific embodiments.

[0083] In one embodiment, according to Figure 5As shown, the near-eye display device includes a first optical lens 110, an optical waveguide 120, and a second optical lens 130, which are stacked sequentially. The first optical lens 110 is a convex lens, and the second optical lens 130 is a concave lens.

[0084] The first optical lens 110 has a first outer surface 111 and a first inner surface 112. The optical waveguide 120 has a first plane 121 and a second plane 122. The second optical lens 130 has a second outer surface 131 and a second inner surface 132. The first outer surface 111 is the surface closer to the environment. The second outer surface 131 is the surface closer to the human eye. The first plane 121 is adjacent to the first inner surface 112, and the second plane 122 is adjacent to the second inner surface 132.

[0085] The first outer surface 111 has a planar portion 111a and a curved portion 111b. The second outer surface 131 is entirely curved. The first inner surface 112 is planar, and the second inner surface 132 is curved.

[0086] A coupling grating 140 is provided on both the first inner surface 112 and the second plane 122. A coupling out grating 150 is provided on both the first inner surface 112 and the second plane 122.

[0087] based on Figure 5 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.

[0088] based on Figure 5 The first optical lens 110, the optical waveguide 120, and the second optical lens 130 shown can have coupling gratings disposed on the optical lenses, which can also be disposed on the planar portion 111a. Similarly, the coupling gratings disposed on the optical waveguide 120 can also be disposed on the first planar surface 121. The coupling gratings disposed on the optical waveguide 120 can also be disposed on the first planar surface 121. The specific arrangements of the coupling gratings and coupling gratings can be arbitrarily combined according to the 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, the first optical lens and the optical waveguide sheet are equivalent to a double diffractive waveguide superposition, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0089] In one embodiment, Figure 6The near-eye display device shown includes a first optical lens 610, an optical waveguide 620, and a second optical lens 630, which are sequentially stacked. The first optical lens 610 is a convex lens, and the second optical lens 630 is a concave lens. The size of the second optical lens 630 is smaller than the size of the optical waveguide 620.

[0090] The first optical lens 610 has a first outer surface 611 and a first inner surface 612. The optical waveguide 620 has a first plane 621 and a second plane 622. The second optical lens 630 has a second outer surface 631 and a second inner surface 632. The first outer surface 611 is the surface closer to the environment. The second outer surface 631 is the surface closer to the human eye. The first plane 621 is adjacent to the first inner surface 612, and the second plane 622 is adjacent to the second inner surface 632.

[0091] The first outer surface 611 has a planar portion 611a and a curved portion 611b. The second outer surface 631 is entirely curved. The first inner surface 612 is planar, and the second inner surface 632 is curved.

[0092] A coupling grating 640 is provided on both the first inner surface 612 and the second plane 622. A coupling out grating 650 is provided on both the first inner surface 612 and the second plane 622.

[0093] based on Figure 6 The near-eye display device shown can emit light in either a first direction or a second direction.

[0094] based on Figure 6 The first optical lens 610, the optical waveguide 620, and the second optical lens 630 shown can have coupling gratings disposed on the optical lenses, which can also be disposed on the planar portion 611a. Similarly, the coupling gratings disposed on the optical waveguide 620 can also be disposed on the first planar surface 621. The coupling gratings disposed on the optical waveguide 620 can also be disposed on the first planar surface 621. The specific arrangements of the coupling gratings and coupling gratings can be arbitrarily combined according to the 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, the first optical lens and the optical waveguide sheet are equivalent to a double diffractive waveguide superposition, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0095] In one embodiment, Figure 7The near-eye display device shown includes a first optical lens 710, an optical waveguide 720, and a second optical lens 730, which are sequentially stacked. The first optical lens 710 is a convex lens, and the second optical lens 730 is a concave lens. The size of the second optical lens 730 is smaller than the size of the optical waveguide 720.

[0096] The first optical lens 710 has a first outer surface 711 and a first inner surface 712. The optical waveguide 720 has a first plane 721 and a second plane 722. The second optical lens 730 has a second outer surface 731 and a second inner surface 732. The first outer surface 711 is the surface closer to the environment. The second outer surface 731 is the surface closer to the human eye. The first plane 721 is adjacent to the first inner surface 712, and the second plane 722 is adjacent to the second inner surface 732.

[0097] The first outer surface 711 is entirely curved. The second outer surface 731 is entirely curved. The first inner surface 712 is a plane, and the second inner surface 732 is a plane.

[0098] A coupling grating 740 is provided on both the first inner surface 712 and the second plane 722. A coupling out grating 750 is provided on both the first inner surface 712 and the second plane 722.

[0099] based on Figure 7 The near-eye display device shown can only emit light in the second direction.

[0100] based on Figure 7 The first optical lens 710, optical waveguide 720, and second optical lens 730 are shown. The coupling grating disposed on the optical waveguide 720 can also be disposed on the first plane 721. The coupling grating disposed on the optical lens can also be disposed on the second inner surface 732. The coupling grating disposed on the optical waveguide 720 can also be disposed on the first plane 721. The specific arrangements of the coupling grating and the coupling grating can be arbitrarily combined according to the positions listed above. It should be noted that, based on the above combination methods, Figure 7 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, the first optical lens and the optical waveguide sheet are equivalent to a double diffractive waveguide superposition, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0101] In one embodiment, Figure 8The near-eye display device shown includes a first optical lens 810, an optical waveguide 820, and a second optical lens 830, which are sequentially stacked. The first optical lens 810 is a convex lens, and the second optical lens 830 is a concave lens. The size of the second optical lens 830 is smaller than the size of the optical waveguide 820.

[0102] The first optical lens 810 has a first outer surface 811 and a first inner surface 812. The optical waveguide 820 has a first plane 821 and a second plane 822. The second optical lens 830 has a second outer surface 831 and a second inner surface 832. The first outer surface 811 is the surface closer to the environment. The second outer surface 831 is the surface closer to the human eye. The first plane 821 is adjacent to the first inner surface 812, and the second plane 822 is adjacent to the second inner surface 832.

[0103] The first outer surface 811 is entirely curved. The second outer surface 831 is entirely curved. The first inner surface 812 is a plane, and the second inner surface 832 is a curved surface.

[0104] A coupling grating 840 is provided on both the first inner surface 812 and the second plane 822. A coupling out grating 850 is provided on both the first inner surface 812 and the second plane 822.

[0105] based on Figure 8 The near-eye display device shown can only emit light in the second direction.

[0106] based on Figure 8 The first optical lens 810, optical waveguide 820, and second optical lens 830 are shown. The coupling grating disposed on the optical waveguide 820 can also be disposed on the first plane 821. Similarly, the coupling out grating disposed on the optical waveguide 820 can also be disposed on the first plane 821. The specific arrangements of the coupling grating and the coupling out grating can be arbitrarily combined according to the positions listed above. It should be noted that, based on the above combinations, Figure 8 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, the first optical lens and the optical waveguide sheet are equivalent to a double diffractive waveguide superposition, so as to improve optical efficiency, reduce optical loss, and improve the display effect of color uniformity and brightness uniformity of the displayed image.

[0107] In one embodiment, Figure 9 The near-eye display device shown includes a first optical lens 910, an optical waveguide 920, and a second optical lens 930, which are sequentially stacked. The first optical lens 910 is a convex lens, and the second optical lens 930 is a concave lens. The size of the first optical lens 910 is smaller than the size of the optical waveguide 920.

[0108] The first optical lens 910 has a first outer surface 911 and a first inner surface 912. The optical waveguide 920 has a first plane 921 and a second plane 922. The second optical lens 930 has a second outer surface 931 and a second inner surface 932. The first outer surface 911 is the surface closer to the environment. The second outer surface 931 is the surface closer to the human eye. The first plane 921 is adjacent to the first inner surface 912, and the second plane 922 is adjacent to the second inner surface 932.

[0109] The first outer surface 911 is entirely curved. The second outer surface 931 is entirely curved. The first inner surface 912 is a plane, and the second inner surface 932 is a plane.

[0110] A coupling grating 940 is provided on both the second inner surface 932 and the first plane 921. A coupling out grating 950 is provided on both the second inner surface 932 and the first plane 921.

[0111] based on Figure 9 The near-eye display device shown can only emit light in the first direction.

[0112] based on Figure 9 The first optical lens 910, optical waveguide 920, and second optical lens 930 are shown. The coupling grating disposed on the optical waveguide 920 can also be disposed on the second plane 922. The coupling grating disposed on the optical lens can also be disposed on the first inner surface 912. The coupling grating disposed on the optical waveguide 920 can also be disposed on the second plane 922. The specific arrangements of the coupling grating and the coupling grating can be arbitrarily combined according to the positions listed above. It should be noted that, based on the above combination methods, Figure 9 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, the second optical lens and the optical waveguide sheet are equivalent to the superposition of two diffractive optical 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.

[0113] In one embodiment, Figure 10 The near-eye display device shown includes a first optical lens 1010, an optical waveguide 1020, and a second optical lens 1030, which are sequentially stacked. The first optical lens 1010 is a concave lens, and the second optical lens 1030 is a concave lens. The size of the first optical lens 1010 is smaller than the size of the optical waveguide 1020.

[0114] The first optical lens 1010 has a first outer surface 1011 and a first inner surface 1012. The optical waveguide 1020 has a first plane 1021 and a second plane 1022. The second optical lens 1030 has a second outer surface 1031 and a second inner surface 1032. The first outer surface 1011 is the surface closer to the environment. The second outer surface 1031 is the surface closer to the human eye. The first plane 1021 is adjacent to the first inner surface 1012, and the second plane 1022 is adjacent to the second inner surface 1032.

[0115] The first outer surface 1011 is entirely curved. The second outer surface 1031 is entirely curved. The first inner surface 1012 is entirely curved, and the second inner surface 1032 is a plane.

[0116] A coupling grating 1040 is provided on both the second inner surface 1032 and the first plane 1021. A coupling out grating 1050 is provided on both the second inner surface 1032 and the first plane 1021.

[0117] based on Figure 10 The near-eye display device shown can only emit light in the first direction.

[0118] based on Figure 10 The first optical lens 1010, optical waveguide 1020, and second optical lens 1030 shown are illustrated. The coupling grating disposed on the optical waveguide 1020 can also be disposed on the second plane 1022. Similarly, the coupling grating disposed on the optical waveguide 1020 can also be disposed on the second plane 1022. The specific arrangements of the coupling grating and coupling grating can be arbitrarily combined according to the positions listed above. It should be noted that, based on the above combination method, Figure 10 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, the second optical lens and the optical waveguide sheet are equivalent to the superposition of two diffractive optical 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.

[0119] In one embodiment, Figure 11 The near-eye display device shown includes a first optical lens 1110, an optical waveguide 1120, and a second optical lens 1130, which are sequentially stacked. The first optical lens 1110 is a concave lens, and the second optical lens 1130 is a concave lens. The size of the first optical lens 1110 is smaller than the size of the optical waveguide 1120.

[0120] The first optical lens 1110 has a first outer surface 1111 and a first inner surface 1112. The optical waveguide 1120 has a first plane 1121 and a second plane 1122. The second optical lens 1130 has a second outer surface 1131 and a second inner surface 1132. The first outer surface 1111 is the surface closer to the environment. The second outer surface 1131 is the surface closer to the human eye. The first plane 1121 is adjacent to the first inner surface 1112, and the second plane 1122 is adjacent to the second inner surface 1132.

[0121] The first outer surface 1111 is entirely curved. The second outer surface 1131 has a planar portion 1131a and a curved portion 1131b. The first inner surface 1112 is entirely curved, and the second inner surface 1132 is planar.

[0122] A coupling grating 1140 is provided on both the planar portion 1131a and the first plane 1121. A coupling grating 1150 is provided on both the second inner surface 1132 and the first plane 1121.

[0123] based on Figure 11 The near-eye display device shown has an optical engine that emits light in either a first or a second direction.

[0124] based on Figure 11 The first optical lens 1110, the optical waveguide 1120, and the second optical lens 1130 shown are illustrated. The coupling grating disposed on the optical waveguide 1120 can also be disposed on the second plane 1122. Similarly, the coupling grating disposed on the optical lens can also be disposed on the second plane 1132. The coupling grating disposed on the optical waveguide 1120 can also be disposed on the second plane 1122. The specific arrangements of the coupling gratings and coupling gratings can be arbitrarily combined according to the positions listed above. It should be noted that, based on the above combinations, Figure 11 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, the second optical lens and the optical waveguide sheet are equivalent to the superposition of two diffractive optical 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.

[0125] 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.

[0126] One embodiment of the present invention provides an electronic device. The electronic device includes the optical system provided in any of the above embodiments.

[0127] The electronic device can be any of the following: VR (Virtual Reality) device, AR (Augmented Reality) device, or DLP (Digital Light Processing) device.

[0128] 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.

[0129] 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: A first optical lens, an optical waveguide sheet, and a second optical lens are sequentially stacked. The first optical lens has a first outer surface and a first inner surface, the optical waveguide has a first plane and a second plane, 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, the second outer surface is the surface closer to the human eye, the first plane is adjacent to the first inner surface, and the second plane is adjacent to the second inner surface. At least a portion of the first outer surface is curved, at least a portion of the second outer surface is curved, and at least one of the first inner surface and the second inner surface is a plane. A coupling grating is provided on one surface of at least one of the first optical lens and the second optical lens, and a coupling grating is provided on at least one of the first plane and the second plane, and the light emitted from the optomechanical system cannot pass through the curved surface before entering the coupling grating; A coupling grating is provided on at least one of the first inner surface and the second inner surface, and the inner surface where the coupling grating is located is a plane, and the coupling grating is provided on at least one of the first plane and the second plane.

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 planar portion and a curved portion, and the coupling grating provided on the first outer surface is provided on the planar portion of the first outer surface; When a coupling grating is provided on the second outer surface, the second outer surface has a planar portion and a curved portion, and the coupling grating provided on the second outer surface is provided on the planar portion of the second outer surface.

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 optical waveguide sheet is provided with an insertion grating and an output grating, the insertion grating and the output grating provided on the optical waveguide sheet are located on the same surface, or the insertion grating and the output grating provided on the optical waveguide sheet 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 in which the light rays emitted by the optical engine are either a first direction or a second direction, wherein, 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 4, characterized in that, When the direction of the light emitted by the optical engine is a first direction, the first outer surface has a planar portion, such that all the light emitted by the optical engine passes through the planar portion of the first outer surface, or such that the light emitted by the optical engine is diffracted by a coupling grating disposed on the planar portion of the first outer surface. When the direction of the light emitted by the optical engine is the second direction, the second outer surface has a planar portion, such that all the light emitted by the optical engine passes through the planar portion of the second outer surface, or such that the light emitted by the optical engine is diffracted by a coupling grating disposed on the planar portion of the second outer surface.

6. The near-eye display device according to claim 4, characterized in that, When the direction of the light emitted by the optical engine is a first direction and the first outer surface is a fully curved surface, the size of the first optical lens is smaller than the size of the optical waveguide, so that the light emitted by the optical engine directly enters the optical waveguide, or the light emitted by the optical engine is directly diffracted by the coupling grating disposed on the first plane. When the direction of the light emitted by the optical engine is the second direction and the second outer surface is entirely curved, the size of the second optical lens is smaller than the size of the optical waveguide, so that the light emitted by the optical engine directly enters the optical waveguide, or the light emitted by the optical engine is directly diffracted by the coupling grating disposed on the second plane.

7. The near-eye display device according to claim 1, characterized in that, The regions corresponding to each coupled grating partially or completely overlap along the direction of the superposition setting. The regions corresponding to each coupled grating partially or completely overlap along the direction of the superposition setting.

8. 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.

9. 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.

10. The near-eye display device according to any one of claims 1-9, characterized in that, The optical power of the first optical lens and the optical power of the second optical lens have opposite signs.

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

12. An electronic device, characterized in that, Includes the optical system as described in claim 11.

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