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

Abstract

The invention relates to a near-to-eye display device, an optical system and electronic equipment, the near-to-eye display device comprises a first optical lens, an optical waveguide sheet and a second optical lens, the first optical lens is provided with a first outer surface and a first inner surface, and the optical waveguide sheet is provided with a first plane and a second plane; the second optical lens is provided with 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, and at least one of the first inner surface and the second inner surface is a plane; a coupling-in grating is arranged on one surface of at least one of the first optical lens and the second optical lens, a coupling-in grating is arranged on at least one of the first plane and the second plane, and 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 out-coupling grating is located is a plane, and at least one of the first plane and the second plane is provided with the out-coupling grating.

Description

Technical Field

[0001] The present disclosure relates to optical display technology, and more specifically, to a near-eye display device, an optical system, and an electronic device. Background Art

[0002] Augmented reality and mixed reality technologies are widely used in many industries by combining virtual information with the real world. In the corresponding electronic devices, optical waveguides are regarded as one of the best optical display devices due to their good optical effects and low process difficulty. The current technical solutions are to set coupling-in gratings and coupling-out gratings on the optical waveguides.

[0003] In order to improve the display effect, the current technical solution is to add an optical waveguide. This method will increase the cost on the one hand and increase the weight of the equipment on the other. Summary of the invention

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

[0005] According to a first aspect of the present invention, there is provided a near-eye display device, comprising: a first optical lens, a light waveguide sheet, and a second optical lens which are sequentially stacked,

[0006] The first optical lens has a first outer surface and a first inner surface, the optical waveguide plate 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 a surface close to the environment, the second outer surface is a surface close 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 a curved surface, at least a portion of the second outer surface is a curved surface, and at least one of the first inner surface and the second inner surface is a flat surface.

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

[0009] An outcoupling grating is arranged on at least one of the first inner surface and the second inner surface, and the inner surface where the outcoupling grating is located is a plane, and an outcoupling grating is arranged on at least one of the first plane and the second plane.

[0010] Optionally, in the case where the first outer surface is provided with an incoupling grating, the first outer surface has a planar portion and a curved portion, and the incoupling grating provided on the first outer surface is provided on the planar portion of the first outer surface;

[0011] In the case where the second outer surface is provided with a coupling-in grating, the second outer surface has a planar portion and a curved portion, and the coupling-in grating provided on the second outer surface is provided on the planar portion of the second outer surface.

[0012] Optionally, in the case where the first optical lens is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the first optical lens are located on the same surface, or the in-coupling grating and the out-coupling grating provided on the first optical lens are located on different surfaces;

[0013] In the case where the optical waveguide sheet is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on the same surface, or the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on different surfaces;

[0014] In the case where the second optical lens is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the second optical lens are located on the same surface, or the in-coupling grating and the out-coupling grating provided on the second optical lens are located on different surfaces.

[0015] Optionally, the direction of the light emitted by the optical machine is the first direction or the second direction, and the light emitted by the optical machine cannot pass through the curved surface before entering the coupling grating, wherein,

[0016] The first direction is a direction from the environment side to the human eye side, and the second direction is a direction from the human eye side to the environment side.

[0017] Optionally, when the direction of the light emitted by the optical engine is the first direction, the first outer surface has a plane portion, so that all the light emitted by the optical engine passes through the plane portion of the first outer surface, or the light emitted by the optical engine is diffracted by an in-coupling grating arranged on the plane portion of the first outer surface;

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

[0019] Optionally, when the direction of the light emitted by the optical engine is the 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 sheet, so that the light emitted by the optical engine directly enters the optical waveguide sheet, or the light emitted by the optical engine is directly diffracted by an in-coupling grating arranged on the first plane;

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

[0021] Optionally, the regions corresponding to the coupling-in gratings partially overlap or completely overlap along the direction corresponding to the superposition setting;

[0022] The regions corresponding to the outcoupling gratings partially overlap or completely overlap along the direction corresponding to 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 coupling-in grating is a one-dimensional grating, and the coupling-out grating is a two-dimensional grating; or,

[0025] The coupling-in grating is a one-dimensional grating, and the coupling-out grating is a mixed one-dimensional grating and a two-dimensional grating.

[0026] Optionally, the inner surface on which the outcoupling grating is provided is also provided with a turning 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 present invention, an optical system is provided, comprising: a near-eye display device as described in any one of the first aspects and an optical machine, wherein the optical machine is used to project light onto the coupling-in grating.

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

[0030] The near-eye display device provided by the embodiment of the present invention not only has an in-coupling grating and an out-coupling grating arranged on the optical waveguide sheet, but also has an in-coupling grating and an out-coupling grating arranged on the optical lens. Light can be diffracted by the in-coupling grating arranged on the optical waveguide sheet and enter the first optical lens, and then be reflected and propagated, and then be diffracted by the out-coupling grating arranged on the optical waveguide sheet and enter the user's eyes. Light can also be diffracted by the in-coupling grating arranged on the optical lens and enter the optical lens, and then be reflected and propagated, and then be diffracted by the out-coupling grating and enter the user's eyes. In this way, the first optical lens or the second optical lens can realize the function of light reflection of the optical waveguide substrate, and a display effect realized by superimposing two diffraction optical waveguides can be realized without separately setting a single optical waveguide substrate, thereby saving product cost and reducing product weight. In terms of display effect, optical efficiency is improved, optical loss is reduced, and color uniformity and brightness uniformity of displayed images are improved. In addition, the combination of the first optical lens and the second optical lens can realize the functions of vision correction and virtual image distance correction.

[0031] Features and advantages of the embodiments of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the embodiments of the specification.

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

[0034] Figure 2 Schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention.

[0035] Figure 3 Schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention.

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

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

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

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

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

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

[0043] Fig.11 is a schematic exploded view of a near-eye display device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present 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 in nature and is in no way intended to limit the embodiments of the present specification and its application or uses.

[0046] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] One embodiment of the present invention provides a near-eye display device. Figure 1 As shown, the near-eye display device includes a first optical lens 110, a light waveguide sheet 120, and a second optical lens 130 which are sequentially stacked.

[0048] The first optical lens 110 has a first outer surface 111 and a first inner surface 112. The optical waveguide sheet 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 a surface close to the environment. The second outer surface 131 is a surface close 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 part of the first outer surface 111 is a curved surface. At least part of the second outer surface 131 is a curved surface. That is, the first outer surface 111 is entirely a curved surface, or the first outer surface 111 is partially a curved surface and partially a flat surface. The second outer surface 131 is entirely a curved surface, or the second outer surface 131 is partially a curved surface and partially a flat surface. At least one of the first inner surface 112 and the second inner surface 132 is a flat surface.

[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. Figure 1 Not shown in the figure.

[0051] An outcoupling grating is arranged on at least one of the first inner surface 112 and the second inner surface 132, and the inner surface where the outcoupling grating is located is a plane. An outcoupling grating is arranged 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 planes, an outcoupling grating is arranged 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 a plane, an outcoupling grating is arranged on the plane inner surface.

[0052] The outcoupling grating involved here is Figure 1 It should be noted that the outcoupling grating is arranged on a plane, which is determined by the outcoupling grating's own arrangement requirements.

[0053] The refractive index of the first optical lens meets the preset requirements, so that the light entering through the coupling grating diffraction can be totally reflected and propagated in the first optical lens. The refractive index of the second optical lens meets the preset requirements, so that the light entering through the coupling grating diffraction can be totally reflected and propagated in the second optical lens.

[0054] The first optical lens and the second optical lens are superimposed on each other, and by adjusting the focal lengths and relative positions of the two lenses, combined with the coupling-in grating and the coupling-out grating, precise propagation of light can be achieved, so that the light forms a clear image.

[0055] The near-eye display device provided by the embodiment of the present invention not only has an in-coupling grating and an out-coupling grating arranged on the optical waveguide sheet, but also has an in-coupling grating and an out-coupling grating arranged on the optical lens. Light can be diffracted by the in-coupling grating arranged on the optical waveguide sheet and enter the first optical lens, and then be reflected and propagated, and then be diffracted by the out-coupling grating arranged on the optical waveguide sheet and enter the user's eyes. Light can also be diffracted by the in-coupling grating arranged on the optical lens and enter the optical lens, and then be reflected and propagated, and then be diffracted by the out-coupling grating and enter the user's eyes. In this way, the first optical lens or the second optical lens can realize the function of light reflection of the optical waveguide substrate, and a display effect realized by superimposing two diffraction optical waveguides can be realized without separately setting a single optical waveguide substrate, thereby saving product cost and reducing product weight. In terms of display effect, optical efficiency is improved, optical loss is reduced, and color uniformity and brightness uniformity of displayed images are improved. In addition, the combination of the first optical lens and the second optical lens can realize the functions of vision correction and virtual image distance correction.

[0056] In some embodiments, when the first optical lens is provided with a coupling-in grating, the coupling-in grating is provided on the first outer surface, or the coupling-in grating is provided on the first inner surface. When the first optical lens is provided with a coupling-in grating and a coupling-out grating, light can be diffracted by the coupling-in grating provided on the first optical lens and enter the first optical lens, be reflected and propagated, and then be diffracted out by the coupling-out grating and enter the user's eyes, so that the first optical lens realizes the function of light reflection of the optical waveguide substrate. In addition, the setting position of the coupling-in grating is flexible, so that the setting of the coupling-in grating can match more optical and structural layouts. When the first outer surface is provided with a coupling-in grating, the first outer surface has a planar portion and a curved portion, and the coupling-in grating provided on the first outer surface is provided on the planar portion of the first outer surface. This is determined by the setting requirements of the coupling-in grating itself.

[0057] In some embodiments, when the second optical lens is provided with a coupling-in grating, the coupling-in grating is provided on the second outer surface, or the coupling-in grating is provided on the second inner surface. When the second optical lens is provided with a coupling-in grating and a coupling-out grating, light can be diffracted by the coupling-in grating provided on the second optical lens and enter the second optical lens, be reflected and propagated, and then be diffracted out by the coupling-out grating and enter the user's eyes, so that the second optical lens realizes the function of light reflection of the optical waveguide substrate. In addition, the setting position of the coupling-in grating is flexible, so that the setting of the coupling-in grating can match more optical and structural layouts. When the second outer surface is provided with a coupling-in grating, the second outer surface has a planar portion and a curved portion, and the coupling-in grating provided on the second outer surface is provided on the planar portion of the second outer surface. This is determined by the setting requirements of the coupling-in 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 provided on the first optical lens are located on the same surface, that is, both are provided on the first inner surface. Alternatively, the coupling-in grating and the coupling-out grating provided on the first optical lens are located on different surfaces, that is, the coupling-in grating is provided on the first outer surface, and the coupling-out grating is provided on the first inner surface. In the case where the first outer surface is provided with a coupling-in grating, the first outer surface has a planar portion and a curved portion, and the coupling-in grating provided on the first outer surface is provided on the planar portion of the first outer surface. The combination of the coupling-in grating and the coupling-out grating is flexible so as to be able to match more optical and structural layouts.

[0059] In some embodiments, when the optical waveguide sheet is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on the same surface, that is, both are provided on the first plane, or both are provided on the second plane. Alternatively, the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on different surfaces, that is, the in-coupling grating is provided on the first plane, and the out-coupling grating is provided on the second plane, or the in-coupling grating is provided on the second plane, and the out-coupling grating is provided on the first plane. The combination of the in-coupling grating and the out-coupling grating is flexible, so that more optical and structural layouts can be matched.

[0060] In some embodiments, when the second optical lens is provided with a coupling-in grating and a coupling-out grating, the coupling-in grating and the coupling-out grating provided on the second optical lens are located on the same surface, that is, both are located on the second inner surface. Alternatively, the coupling-in grating and the coupling-out grating provided on the second optical lens are located on different surfaces, that is, the coupling-in grating is provided on the second outer surface, and the coupling-out grating is provided on the second inner surface. When the second outer surface is provided with a coupling-in grating, the second outer surface has a planar portion and a curved portion, and the coupling-in grating provided on the second outer surface is provided on the planar portion of the second outer surface. The combination of the coupling-in grating and the coupling-out grating is flexible so as to be able to match more optical and structural layouts.

[0061] In some embodiments, the direction of the light emitted by the optical machine is a first direction or a second direction, and the light emitted by the optical machine cannot pass through the 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.

[0062] The direction of the light emitted by the optical machine is matched with the setting position of the coupling-in grating to ensure that the light emitted by the optical machine cannot pass through the curved surface before entering the coupling-in grating.

[0063] For example, the direction of the light emitted by the optical machine is a first direction, and the first outer surface has a plane portion. If no coupling grating is set on the plane portion, then all the light emitted by the optical machine passes through the plane portion of the first outer surface to ensure that the light emitted by the optical machine cannot pass through the curved surface before entering the coupling grating. If a coupling grating is set on the plane portion, then the light emitted by the optical machine is diffracted by the coupling grating set on the plane portion of the first outer surface.

[0064] For example, the direction of the light emitted by the optical machine is the second direction, and the second outer surface has a plane portion. If the coupling grating is not set on the plane portion, then all the light emitted by the optical machine passes through the plane portion of the second outer surface to ensure that the light emitted by the optical machine cannot pass through the curved surface before entering the coupling grating. If the coupling grating is set on the plane portion, then the light emitted by the optical machine is diffracted by the coupling grating set on the plane portion of the second outer surface.

[0065] For example, when the direction of the light emitted by the optical machine is the 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 sheet, so that the light emitted by the optical machine directly enters the optical waveguide sheet, or the light emitted by the optical machine is directly diffracted by the coupling grating set on the first plane. The size involved here is the projection size perpendicular to the optical waveguide sheet.

[0066] For example, when the direction of the light emitted by the optical machine is the second direction and the second outer surface is a fully curved surface, the size of the second optical lens is smaller than the size of the optical waveguide sheet, so that the light emitted by the optical machine directly enters the optical waveguide sheet, or the light emitted by the optical machine is directly diffracted by the coupling grating set on the second plane. The size involved here is the projection size perpendicular to the optical waveguide sheet.

[0067] In some embodiments, the regions corresponding to the coupling-in gratings partially overlap or completely overlap along the direction corresponding to the superposition setting. The regions corresponding to the coupling-out gratings partially overlap or completely overlap along the direction corresponding to the superposition setting.

[0068] In the case that the first plane and the second plane are parallel to each other, the direction corresponding to the overlapping arrangement is a direction perpendicular to the first plane and the second plane.

[0069] The area corresponding to the coupling-in grating arranged on the optical lens and the area corresponding to the coupling-in grating arranged on the optical waveguide plate are partially overlapped or completely overlapped, and the area corresponding to the coupling-out grating arranged on the optical lens and the area corresponding to the coupling-out grating arranged on the optical waveguide plate are partially overlapped or completely overlapped, which can improve the optical efficiency and enhance the color uniformity and brightness uniformity of the displayed image.

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

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

[0072] In some embodiments, the coupling-in grating is a one-dimensional grating, and the coupling-out grating is a hybrid of a one-dimensional grating and a two-dimensional grating.

[0073] One-dimensional gratings couple and diffract light in a specific direction, which can effectively control the propagation direction of light. Two-dimensional gratings can process light in two directions, improve coupling efficiency, and allow more light to be coupled out in the desired direction and angle, thereby achieving efficient two-dimensional diffraction.

[0074] Figure 2 FIG. 1 is a schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention. Figure 2As shown, the coupling-in grating is a one-dimensional grating, and the coupling-out grating is a two-dimensional grating.

[0075] Figure 3 FIG. 1 is a schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention. Figure 3 As shown, the coupling-in grating is a one-dimensional grating, and the coupling-out grating is a mixture of a one-dimensional grating and a two-dimensional grating.

[0076] In some embodiments, the inner surface provided with the outcoupling grating is also provided with a turning grating. The light first passes through the turning grating for turning, and then passes through the outcoupling grating for outcoupling, so as to achieve specific turning and efficient outcoupling of the light.

[0077] Figure 4 FIG. 1 is a schematic diagram of an in-coupling grating and an out-coupling grating according to an embodiment of the present invention. Figure 4 As shown, the coupling-in grating is a one-dimensional grating, the turning grating is a one-dimensional grating, and the coupling-out 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 a positive optical power can converge light, and an optical lens with a negative optical power can diverge light. When the first optical lens and the second optical lens are superimposed, the precise propagation of light can be achieved by adjusting the focal length and relative position of the two, and some aberrations can be offset to improve imaging quality. In addition, an optical lens with a negative optical power can diverge light, which helps to expand the field of view, so that light in a wider range can be captured.

[0079] The specific setting of the focal power value of the first optical lens and the focal power value of the second optical lens is determined based on the vision to be corrected. Vision correction is achieved through the combination of the first optical lens and the second optical lens, rather than relying solely on one of the optical lenses.

[0080] In some embodiments, the curved surface of the first optical lens and the second optical lens may be any of the following surface types: a spherical surface, a cylindrical surface, a cylindrical surface superimposed on a spherical surface, and a free-form surface.

[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, and fasteners.

[0082] The near-eye display device provided by the present invention is described below with reference to a number of specific embodiments.

[0083] In one embodiment, according to Figure 5As shown, the near-eye display device includes a first optical lens 110, a light waveguide sheet 120, and a second optical lens 130 which are sequentially stacked. 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 sheet 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 a surface close to the environment. The second outer surface 131 is a surface close 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 a curved surface. The first inner surface 112 is a planar surface, and the second inner surface 132 is a curved surface.

[0086] An in-coupling grating 140 is disposed on both the first inner surface 112 and the second plane 122. An out-coupling grating 150 is disposed on both the first inner surface 112 and the second plane 122.

[0087] based on Figure 5 In the near-eye display device shown, the direction of the light emitted by the optical machine can only be the first direction. The first direction is the direction from the environment side to the human eye side.

[0088] based on Figure 5 The first optical lens 110, the optical waveguide sheet 120 and the second optical lens 130 shown in the figure, the coupling grating arranged on the optical lens can also be arranged on the plane portion 111a, and the coupling grating arranged on the optical waveguide sheet 120 can also be arranged on the first plane 121. The coupling grating arranged on the optical waveguide sheet 120 can also be arranged on the first plane 121. The specific arrangement of the coupling grating and the coupling grating can be arbitrarily combined according to the arrangement positions listed above. It should be noted that based on the above combination, Figure 5 The arrangement of the coupling-in grating and the 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 the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the display effect of color uniformity and brightness uniformity of the displayed image.

[0089] In one embodiment, Figure 6The near-eye display device shown in the figure comprises a first optical lens 610, a light waveguide sheet 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 that of the light waveguide sheet 620.

[0090] The first optical lens 610 has a first outer surface 611 and a first inner surface 612. The optical waveguide sheet 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 a surface close to the environment. The second outer surface 631 is a surface close 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 a curved surface. The first inner surface 612 is a planar surface, and the second inner surface 632 is a curved surface.

[0092] An in-coupling grating 640 is disposed on both the first inner surface 612 and the second plane 622. An out-coupling grating 650 is disposed on both the first inner surface 612 and the second plane 622.

[0093] based on Figure 6 In the near-eye display device shown, the direction of the light emitted by the optical machine can be any one of the first direction and the second direction.

[0094] based on Figure 6 The first optical lens 610, the optical waveguide plate 620 and the second optical lens 630 shown in the figure, the coupling grating arranged on the optical lens can also be arranged on the plane portion 611a, and the coupling grating arranged on the optical waveguide plate 620 can also be arranged on the first plane 621. The coupling grating arranged on the optical waveguide plate 620 can also be arranged on the first plane 621. The specific arrangement of the coupling grating and the coupling grating can be arbitrarily combined according to the arrangement positions listed above. It should be noted that based on the above combination, Figure 6 The arrangement of the coupling-in grating and the 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 the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the display effect of color uniformity and brightness uniformity of the displayed image.

[0095] In one embodiment, Figure 7The near-eye display device shown in the figure comprises a first optical lens 710, a light waveguide sheet 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 that of the light waveguide sheet 720.

[0096] The first optical lens 710 has a first outer surface 711 and a first inner surface 712. The optical waveguide sheet 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 a surface close to the environment. The second outer surface 731 is a surface close 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 a curved surface. The second outer surface 731 is a curved surface. The first inner surface 712 is a flat surface, and the second inner surface 732 is a flat surface.

[0098] An incoupling grating 740 is disposed on both the first inner surface 712 and the second plane 722. An outcoupling grating 750 is disposed on both the first inner surface 712 and the second plane 722.

[0099] based on Figure 7 In the near-eye display device shown, the direction in which the light emitted by the optical machine can only be the second direction.

[0100] based on Figure 7 The first optical lens 710, the optical waveguide sheet 720 and the second optical lens 730 are shown. The coupling grating disposed on the optical waveguide sheet 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 sheet 720 can also be disposed on the first plane 721. The specific settings of the coupling grating and the coupling grating can be arbitrarily combined according to the above-listed setting positions. It should be noted that based on the above combination, Figure 7 The arrangement of the coupling-in grating and the 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 the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the display effect of color uniformity and brightness uniformity of the displayed image.

[0101] In one embodiment, Figure 8The near-eye display device shown in the figure includes a first optical lens 810, a light waveguide sheet 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 that of the light waveguide sheet 820.

[0102] The first optical lens 810 has a first outer surface 811 and a first inner surface 812. The light guide plate 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 a surface close to the environment side. The second outer surface 831 is a surface close to the human eye side. 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 a curved surface. The second outer surface 831 is a curved surface. The first inner surface 812 is a plane, and the second inner surface 832 is a curved surface.

[0104] An incoupling grating 840 is disposed on both the first inner surface 812 and the second plane 822. An outcoupling grating 850 is disposed on both the first inner surface 812 and the second plane 822.

[0105] based on Figure 8 In the near-eye display device shown, the direction in which the light emitted by the optical machine can only be the second direction.

[0106] based on Figure 8 The first optical lens 810, the optical waveguide sheet 820 and the second optical lens 830 shown in the figure, the coupling grating disposed on the optical waveguide sheet 820 can also be disposed on the first plane 821. The coupling grating disposed on the optical waveguide sheet 820 can also be disposed on the first plane 821. The specific arrangement of the coupling grating and the coupling grating can be arbitrarily combined according to the arrangement positions listed above. It should be noted that based on the above combination, Figure 8 The arrangement of the coupling-in grating and the 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 the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the display effect of color uniformity and brightness uniformity of the displayed image.

[0107] In one embodiment, Fig. 9 The near-eye display device shown in the figure includes a first optical lens 910, a light waveguide sheet 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 that of the light waveguide sheet 920.

[0108] The first optical lens 910 has a first outer surface 911 and a first inner surface 912. The optical waveguide sheet 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 a surface close to the environment. The second outer surface 931 is a surface close 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 a curved surface. The second outer surface 931 is a curved surface. The first inner surface 912 is a flat surface, and the second inner surface 932 is a flat surface.

[0110] An incoupling grating 940 is disposed on both the second inner surface 932 and the first plane 921. An outcoupling grating 950 is disposed on both the second inner surface 932 and the first plane 921.

[0111] based on Fig. 9 In the near-eye display device shown, the direction in which the light emitted by the optical machine can only be the first direction.

[0112] based on Fig. 9 The first optical lens 910, the optical waveguide sheet 920 and the second optical lens 930 are shown, and the coupling grating disposed on the optical waveguide sheet 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 sheet 920 can also be disposed on the second plane 922. The specific settings of the coupling grating and the coupling grating can be arbitrarily combined according to the setting positions listed above. It should be noted that based on the above combination, Fig. 9 The arrangement of the coupling-in grating and the 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 plate are equivalent to the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the color uniformity and brightness uniformity of the displayed image.

[0113] In one embodiment, Fig.10 The near-eye display device shown in the figure includes a first optical lens 1010, a light waveguide sheet 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 that of the light waveguide sheet 1020.

[0114] The first optical lens 1010 has a first outer surface 1011 and a first inner surface 1012. The optical waveguide sheet 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 a surface close to the environment side. The second outer surface 1031 is a surface close to the human eye side. 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 a curved surface, the second outer surface 1031 is a curved surface, the first inner surface 1012 is a curved surface, and the second inner surface 1032 is a plane.

[0116] An in-coupling grating 1040 is disposed on the second inner surface 1032 and the first plane 1021. An out-coupling grating 1050 is disposed on the second inner surface 1032 and the first plane 1021.

[0117] based on Fig.10 In the near-eye display device shown, the direction in which the light emitted by the optical machine can only be the first direction.

[0118] based on Fig.10 The first optical lens 1010, the optical waveguide sheet 1020 and the second optical lens 1030 are shown, and the coupling grating disposed on the optical waveguide sheet 1020 can also be disposed on the second plane 1022. The coupling grating disposed on the optical waveguide sheet 1020 can also be disposed on the second plane 1022. The specific arrangement of the coupling grating and the coupling grating can be arbitrarily combined according to the arrangement positions listed above. It should be noted that based on the above combination, Fig.10 The arrangement of the coupling-in grating and the 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 plate are equivalent to the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the color uniformity and brightness uniformity of the displayed image.

[0119] In one embodiment, Fig.11 The near-eye display device shown in the figure includes a first optical lens 1110, a light waveguide sheet 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 that of the light waveguide sheet 1120.

[0120] The first optical lens 1110 has a first outer surface 1111 and a first inner surface 1112. The optical waveguide sheet 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 a surface close to the environment. The second outer surface 1131 is a surface close 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 a curved surface. The second outer surface 1131 has a flat surface portion 1131a and a curved surface portion 1131b. The first inner surface 1112 is entirely a curved surface, and the second inner surface 1132 is a flat surface.

[0122] An in-coupling grating 1140 is disposed on both the plane portion 1131 a and the first plane 1121 . An out-coupling grating 1150 is disposed on both the second inner surface 1132 and the first plane 1121 .

[0123] based on Fig.11 In the near-eye display device shown, the direction in which the light is emitted by the optical machine is the first direction or the second direction.

[0124] based on Fig.11 The first optical lens 1110, the optical waveguide sheet 1120 and the second optical lens 1130 are shown. The coupling grating disposed on the optical waveguide sheet 1120 can also be disposed on the second plane 1122. The coupling grating disposed on the optical lens can also be disposed on the second plane 1132. The coupling-out grating disposed on the optical waveguide sheet 1120 can also be disposed on the second plane 1122. The specific settings of the coupling-in grating and the coupling-out grating can be arbitrarily combined according to the above-listed setting positions. It should be noted that based on the above combination, Fig.11 The arrangement of the coupling-in grating and the 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 plate are equivalent to the superposition of two diffraction optical waveguides, so as to improve the optical efficiency, reduce the optical loss, and enhance the color uniformity and brightness uniformity of the displayed image.

[0125] An embodiment of the present invention provides an optical system, comprising: a near-eye display device as provided in any of the above embodiments and an optical machine. The optical machine is used to project light onto an incoupling grating. The two parts work together to achieve efficient and high-quality light processing to output high-quality display images.

[0126] An embodiment of the present invention provides an electronic device, which includes the optical system provided by any of the above embodiments.

[0127] The electronic device may be any one of a VR (Virtual Reality) device, an AR (Augmented Reality) device, and a DLP (Digital Light Procession) device.

[0128] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the device embodiment, its related parts can be referred to the partial description of the method embodiment.

[0129] The above describes a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. The various embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill 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 plate 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 a surface close to the environment, the second outer surface is a surface close 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 a curved surface, at least a portion of the second outer surface is a curved surface, and at least one of the first inner surface and the second inner surface is a flat surface. A coupling-in grating is arranged on a surface of at least one of the first optical lens and the second optical lens, and a coupling-in grating is arranged on at least one of the first plane and the second plane. An outcoupling grating is arranged on at least one of the first inner surface and the second inner surface, and the inner surface where the outcoupling grating is located is a plane, and an outcoupling grating is arranged 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: In the case where the first outer surface is provided with an incoupling grating, the first outer surface has a planar portion and a curved portion, and the incoupling grating provided on the first outer surface is provided on the planar portion of the first outer surface; In the case where the second outer surface is provided with a coupling-in grating, the second outer surface has a planar portion and a curved portion, and the coupling-in 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: In the case where the first optical lens is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the first optical lens are located on the same surface, or the in-coupling grating and the out-coupling grating provided on the first optical lens are located on different surfaces; In the case where the optical waveguide sheet is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on the same surface, or the in-coupling grating and the out-coupling grating provided on the optical waveguide sheet are located on different surfaces; In the case where the second optical lens is provided with an in-coupling grating and an out-coupling grating, the in-coupling grating and the out-coupling grating provided on the second optical lens are located on the same surface, or the in-coupling grating and the out-coupling 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 machine is the first direction or the second direction, and the light emitted by the optical machine cannot pass through the curved surface before entering the coupling grating, wherein, The first direction is a direction from the environment side to the human eye side, and the second direction is a direction from the human eye side to the environment side.

5. The near-eye display device according to claim 4, characterized in that: In the case where the direction of the light emitted by the optical engine is the first direction, the first outer surface has a plane portion, so that all the light emitted by the optical engine passes through the plane portion of the first outer surface, or the light emitted by the optical engine is diffracted by an in-coupling grating arranged on the plane portion of the first outer surface; When the direction of the light emitted by the optical machine is the second direction, the second outer surface has a planar portion, so that all the light emitted by the optical machine passes through the planar portion of the second outer surface, or the light emitted by the optical machine is diffracted by a coupling grating arranged 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 the 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 sheet, so that the light emitted by the optical engine directly enters the optical waveguide sheet, or the light emitted by the optical engine is directly diffracted by the coupling grating arranged on the first plane; When the direction of the light emitted by the optical machine is the second direction and the second outer surface is a completely curved surface, the size of the second optical lens is smaller than the size of the optical waveguide, so that the light emitted by the optical machine directly enters the optical waveguide, or the light emitted by the optical machine is directly diffracted by the coupling grating set on the second plane.

7. The near-eye display device according to claim 1, characterized in that: The regions corresponding to the coupling-in gratings partially overlap or completely overlap along the direction corresponding to the superposition setting; The regions corresponding to the outcoupling gratings partially overlap or completely overlap along the direction corresponding to 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 coupling-in grating is a one-dimensional grating, and the coupling-out grating is a two-dimensional grating; or, The coupling-in grating is a one-dimensional grating, and the coupling-out grating is a mixed one-dimensional grating and a two-dimensional grating.

9. The near-eye display device according to claim 1, characterized in that: The inner surface on which the outcoupling grating is arranged is also provided with a turning grating.

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

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

12. An electronic device, characterized in that: Comprising the optical system as claimed in claim 11.

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