Display device, head mounted device and packaging method of display device

Abstract

The present invention discloses a display device, a head-mounted device and a packaging method for the display device, wherein the display device comprises: a plurality of light-emitting components, a plurality of projection lenses and an optical waveguide module. Among the plurality of light-emitting components, at least two light-emitting components emit different light rays, which are respectively arranged corresponding to the plurality of light-emitting components, each projection lens is respectively used to receive and collimate the light rays emitted by the corresponding light-emitting component, and the optical waveguide module is used to receive the light rays collimated by the plurality of projection lenses and merge the light rays for emission, so that the optical waveguide module can realize the light combination of different light rays when the light rays are emitted, so that the display device can be used to project a color image for viewing by the user, so that the light-combining prism between the light-emitting component and the projection lens in the related art can be eliminated, so as to reduce the size of the display device along the optical axis direction of the projection lens, so that the structure of the display device is more compact and reasonable, so that the display device can realize a miniaturized design.

Description

Technical Field

[0001] The present invention relates to the field of color display technology, and in particular to a display device, a head-mounted device, and a packaging method for the display device. Background Art

[0002] In AR (Augmented Reality) display technology, a light-combining prism is often used to combine the three-color light emitted by the light-emitting panel to form a true color image, and then the true color image is projected to the optical waveguide through the projection lens, so as to be transmitted to the user's eyes through the optical waveguide for viewing by the user. However, the light-combining prism is large in size and weight, making it difficult to achieve a miniaturized design of the display device, and the user's convenience is poor. Summary of the invention

[0003] The embodiments of the present invention disclose a display device, a head-mounted device and a packaging method for the display device, which realize miniaturization design while achieving fusion and emission of patterns of different colors, and are highly convenient for users to use.

[0004] In order to achieve the above object, the present invention discloses a display device in a first aspect, comprising:

[0005] A plurality of light-emitting elements, wherein at least two of the plurality of light-emitting elements emit different light;

[0006] A plurality of projection lenses, each of which is arranged in one-to-one correspondence with each of the light-emitting elements, and each of the projection lenses is used to receive and collimate the light emitted by the corresponding light-emitting element; and

[0007] An optical waveguide module, the optical waveguide module is used to receive each light beam collimated by the multiple projection lenses and merge the light beams for output. The optical waveguide module includes a plurality of waveguide sheets. Along the incident direction of the light beams, the plurality of waveguide sheets are stacked in sequence, and each waveguide sheet is arranged in a one-to-one correspondence with each projection lens. Each waveguide sheet includes an incident portion and an output portion connected to the incident portion. The incident portion is provided with an incident grating. The incident grating included in each waveguide sheet is used to respectively receive and diffract the light beams collimated by the projection lenses. The output portions included in each waveguide sheet are arranged correspondingly, and the output portion is used to output light beams.

[0008] Different light beams emitted by a plurality of light emitting elements are projected toward an optical waveguide module through corresponding projection lenses respectively, so as to be received by the optical waveguide module, and each light beam is merged and emitted through the optical waveguide module to realize light combination of different light beams, so that the display device can be used to project a color image for viewing by a user, thereby eliminating the light combining prism between the light emitting element and the projection lens in the related art, reducing the size of the display device along the optical axis direction of the projection lens, making the structure of the display device more compact and reasonable, and thus enabling the display device to achieve a miniaturized design.

[0009] In addition, by making the optical waveguide module include multiple waveguide sheets, it is possible to avoid mutual interference between different light beams during the transmission process, thereby alleviating the phenomenon that different light beams change during the transmission process, thereby improving the clarity of the color image displayed by the display device.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, an incident groove is provided on a side of the incident portion facing the projection lens, an incident grating is provided on a side of the incident portion facing away from the projection lens, the incident grating is arranged corresponding to the incident groove, and an exit grating is provided on a side of the exit portion facing away from the projection lens;

[0011] The incident groove is used for allowing each light beam collimated by the plurality of projection lenses to enter the interior of the incident portion and be diffracted by the incident grating.

[0012] Among them, the incident groove is used to allow each light beam that has been collimated by multiple projection lenses to enter the interior of the incident part and be diffracted by the incident grating. The light beam that has been diffracted by the incident grating is transmitted through the interior of the optical waveguide module to the exit part, and the exit part is used to emit light beams, thereby realizing the function of conducting different light beams and merging them for output.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the output portion is provided with an output grating, and the output grating on each layer of the waveguide plate is correspondingly arranged, and the output grating is used to emit light, thereby changing the transmission direction of the light through the output grating to emit the light out of the waveguide plate.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, in every two adjacent layers of the multi-layer waveguide plates, one layer of the waveguide plates is a first waveguide plate, and the other layer of the waveguide plates is a second waveguide plate, along the incident direction of the light, the second waveguide plate is stacked on the first waveguide plate, and the projection of the incident grating on the second waveguide plate on the first waveguide plate is located within the range of the incident grating on the first waveguide plate.

[0015] It can be understood that the light that needs to be transmitted through the second waveguide must first pass through the first waveguide before it can be emitted to the second waveguide. By making the projection of the incident grating on the second waveguide on the first waveguide be located within the range of the incident grating on the first waveguide, the light used to be transmitted in the second waveguide can pass through the incident grating on the first waveguide to be emitted into the second waveguide, thereby realizing the function of distinguishing different light rays and transmitting different light rays through each waveguide.

[0016] As an optional implementation, in an embodiment of the first aspect of the present invention, the incident gratings on each layer of the waveguide plate are staggered to diffract different light rays so that different light rays can be conducted in each waveguide plate respectively.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, it is characterized in that, in every two adjacent layers of the multi-layer waveguide plates, one layer of the waveguide plates is a first waveguide plate, and the other layer of the waveguide plates is a second waveguide plate, along the incident direction of the light, the second waveguide plate is stacked on the first waveguide plate, an incident through hole is provided on the first waveguide plate, and the projection of the incident grating on the second waveguide plate on the first waveguide plate is located within the range of the incident through hole.

[0018] By setting the incident through hole to avoid the incident path of other light rays, other light rays can be allowed to pass through while reducing the loss of other light rays when passing through non-corresponding waveguide plates, thereby further improving the image projection quality of the display device.

[0019] As an optional implementation, in an embodiment of the first aspect of the present invention, the display device also includes a bracket, the bracket includes a bearing portion and a mounting portion arranged on the bearing portion, the bearing portion is provided with a first mounting cavity, the mounting portion is provided with a second mounting cavity, the second mounting cavity is communicated with the first mounting cavity, a plurality of projection lenses are arranged in the second mounting cavity, the optical waveguide module is at least partially arranged in the first mounting cavity to receive the light collimated by the projection lens, and the bracket is respectively connected to the optical waveguide module and the projection lens, so that the optical waveguide module and the projection lens are fixedly connected, so that the display device can be formed into a structurally stable whole.

[0020] As an optional implementation, in an embodiment of the first aspect of the present invention, there are multiple mounting parts, and the mounting parts are connected to each other, or at least one mounting part is separately arranged from the remaining mounting parts, so that the relative position design between the mounting parts can be more flexible;

[0021] There are multiple second mounting cavities, each of which is respectively arranged in each of the mounting parts, and each of the projection lenses is respectively arranged in each of the second mounting cavities, thereby increasing the connection area between the projection lens and the mounting part, so that the connection between the projection lens and the mounting part is more stable.

[0022] As an optional implementation, in an embodiment of the first aspect of the present invention, the display device further includes a heat sink, and each of the light-emitting elements is disposed on a side of the heat sink facing the projection lens; or,

[0023] The display device further comprises a plurality of heat dissipation plates, and each of the light emitting elements is respectively arranged on a side of each of the heat dissipation plates facing the projection lens.

[0024] The heat sink is used to carry the light-emitting element and dissipate heat for the light-emitting element. At the same time, the heat sink can be used to reinforce the strength of the structure of the light-emitting element (for example, the flexible circuit board on the light-emitting element). When there is one heat sink, the number of parts of the display device can be reduced to reduce the installation steps when the heat sink is connected to the projection lens. When there are multiple heat sinks, each light-emitting element is respectively arranged on each heat sink, so that the relative position of each light-emitting element is not fixed. After each light-emitting element is connected to the lens barrel of each projection lens through each heat sink, each projection lens can also adjust its position relative to the optical waveguide module, so that the projection of different color patterns emitted by each light-emitting element after being transmitted through the projection lens and the optical waveguide module, the quality of the projected image is better, thereby improving the quality of the final projected synthesized color image.

[0025] As an optional implementation, in an embodiment of the first aspect of the present invention, the projection lens includes a lens barrel and a lens installed in the lens barrel, the object side end of the lens barrel is located at the outer periphery of the corresponding light-emitting component and is fixedly connected to the heat dissipation plate, the lens is arranged toward the light-emitting component, and the lens is used to receive and collimate the light emitted by the corresponding light-emitting component, so that the lens can be fixed and encapsulated by the lens barrel to form a stable integral structure.

[0026] As an optional implementation, in an embodiment of the first aspect of the present invention, the plurality of projection lenses are arranged in a ring shape or in a straight line, so that the arrangement of the plurality of projection lenses is more compact.

[0027] A second aspect of the present invention discloses a packaging method for the display device as described in the first aspect, comprising:

[0028] Providing a plurality of light-emitting components and a plurality of projection lenses, and packaging each of the light-emitting components with each of the projection lenses;

[0029] Providing an optical waveguide module;

[0030] Actively aligning the projection lens and the optical waveguide module;

[0031] The projection lens and the optical waveguide module are packaged to obtain the display device.

[0032] By adopting the packaging method of the display device, it is possible to package and fix each projection lens corresponding to each light-emitting component, and package and fix each projection lens corresponding to the incident part of the optical waveguide module, so that the display device can receive the light emitted by each light-emitting component through each projection lens, collimate each light and project it to the incident part of the optical waveguide module, so that each light is merged and emitted through each optical waveguide module, and different light rays are combined, so that the display device can be used to project a color image, and the display device can not include a light-combining prism in the related art, and the structure of the display device is more compact and reasonable, and a miniaturized design can be achieved.

[0033] As an optional implementation, in an embodiment of the second aspect of the present invention, when the display device includes a plurality of heat sinks respectively connected to the light emitting elements, actively aligning the plurality of projection lenses with the optical waveguide module includes:

[0034] Each of the projection lenses is actively aligned with the optical waveguide module.

[0035] Therefore, by actively aligning each projection lens with the optical waveguide module, each projection lens can project onto the optical waveguide module, and the quality of the projection pattern transmitted and merged by the optical waveguide module can be optimized, so that the quality of the merged pattern displayed by the display device can be optimized.

[0036] The third aspect of the present invention discloses a head-mounted device, including the display device as described in the first aspect above, so as to achieve a miniaturized design of the head-mounted device, and also improve the R display quality of the head-mounted device and the performance of the head-mounted device.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The display device, head-mounted device and packaging method of the display device provided by the embodiment of the present invention respectively project different light rays emitted by multiple light-emitting components to the optical waveguide module through corresponding projection lenses, so as to be received by the optical waveguide module, and each light ray is merged and emitted through the optical waveguide module to achieve light combination of different light rays, so that the display device can be used to project a color image. It can be seen that by adopting the solution of the present application, the light-combining prism between the light-emitting component and the projection lens in the related art can be eliminated to reduce the size of the display device along the optical axis direction of the projection lens, thereby making the structure of the display device more compact and reasonable, and thus the display device can achieve a miniaturized design.

[0039] In addition, by making the optical waveguide module include multiple waveguide sheets, it is possible to avoid mutual interference between different light beams during the transmission process, thereby alleviating the phenomenon that different light beams change during the transmission process, thereby improving the clarity of the color image displayed by the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a schematic diagram of the structure of a display device in the related art;

[0042] Figure 2 yes Figure 1 Sectional view along the AA direction;

[0043] Figure 3 is a schematic structural diagram of a display device disclosed in the first aspect of the embodiment of the present application;

[0044] Figure 4 yes Figure 3 Cross-sectional view along the BB direction;

[0045] Figure 5 is a schematic diagram of the structural decomposition of the display device disclosed in the first aspect of the embodiment of the present application;

[0046] Figure 6 It is a schematic diagram of the structural decomposition of the light-emitting element and the heat dissipation plate disclosed in the first aspect of the embodiment of the present application;

[0047] Figure 7 is a structural cross-sectional view of the bracket disclosed in the first aspect of the embodiment of the present application;

[0048] Figure 8 is a simplified structural diagram of the installation portion disclosed in the first aspect of the embodiment of the present application;

[0049] Fig. 9 is a structural cross-sectional view of the optical waveguide module disclosed in the first aspect of the embodiment of the present application;

[0050] Fig.10 is a schematic diagram of light transmission of the optical waveguide module disclosed in the first aspect of the embodiment of the present application;

[0051] Fig.11 It is a flow chart of a packaging method of a display device disclosed in the second aspect of the embodiment of the present application;

[0052] Fig.12 is a schematic diagram of a packaging process of a packaging method for a display device disclosed in the second aspect of an embodiment of the present application;

[0053] Fig.13 is another schematic flow chart of the packaging method of the display device disclosed in the second aspect of the embodiment of the present application;

[0054] Fig.14 It is a schematic diagram of the alignment process of the projection lens and the optical waveguide module in the packaging method of the display device disclosed in the second aspect of the embodiment of the present application;

[0055] Fig.15 It is a schematic diagram of the structure of the head-mounted device disclosed in the third aspect of the embodiment of the present application.

[0056] Icons: 1. Display device; 1a. Light-combining prism; 10. Light-emitting element; 11. Projection lens; 110. Lens barrel; 111. Lens; 12. Optical waveguide module; 120. Incident part; 120a. Incident groove; 120b. Incident grating; 121. Emission part; 121a. Exit grating; 13. Waveguide plate; 13a. Waveguide plate No. 1; 13b. Waveguide plate No. 2; 13c. Waveguide plate No. 3; 130. First waveguide plate; 130a. Incident through hole; 131. Second waveguide plate; 14. Bracket; 140. Bearing part; 140a. First mounting cavity; 141. Mounting part; 141a. Second mounting cavity; 15. Heat sink; 16. Shading part; 2. Head-mounted device. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0059] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0060] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0062] Please also read Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of a display device in the related art, Figure 2 yes Figure 1 In the cross-sectional view along the AA direction, the display device 3 included in the AR (Augmented Reality) display technology often uses a light-combining prism 3a to combine the three-color light emitted by the light-emitting element 30 to form a true color image, and then projects the true color image to the optical waveguide module 32 through the projection lens 31, so as to be transmitted through the optical waveguide module 32 and then projected to the user's eyes for viewing by the user. However, the volume and weight of the light-combining prism 3a are large, which makes it difficult to realize a miniaturized design of the display device 3, and the convenience of user use is poor.

[0063] Based on this, the present application provides a display device that realizes the fusion and output of patterns of different colors while achieving a miniaturized design of the display device, which is highly convenient for users to use.

[0064] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0065] Please also read Figures 3 to 5 , Figure 3 is a schematic diagram of the structure of the display device disclosed in the first aspect of the embodiment of the present application, Figure 4 yes Figure 3The cross-sectional view along the BB direction, Figure 5 It is a schematic diagram of the structural decomposition of the display device disclosed in the first aspect of the embodiment of the present application. The first aspect of the embodiment of the present invention discloses a display device 1, which can be applied to an electronic device for displaying color images. For example, the display device 1 can be applied to a head-mounted device (such as AR glasses) to display color images on the lenses of the head-mounted device for viewing by a user wearing the head-mounted device. Specifically, the display device 1 includes: a plurality of light-emitting components 10, a plurality of projection lenses 11, and an optical waveguide module 12. Among the plurality of light-emitting components 10, at least two light-emitting components 10 emit different light rays. Each projection lens 11 is arranged in a one-to-one correspondence with each light-emitting component 10. Each projection lens 11 is respectively used to receive and collimate the light emitted by the corresponding light-emitting component 10. The optical waveguide module 12 is used to receive and collimate the light rays after being collimated by the plurality of projection lenses 11 and to fuse and emit the light rays. The optical waveguide module 12 includes a multilayer waveguide sheet 13 (see Fig. 9 ), along the incident direction Q of the light (see Fig. 9 ), a plurality of waveguide plates 13 are stacked in sequence, and each waveguide plate 13 is arranged in one-to-one correspondence with each projection lens 11, each waveguide plate 13 includes an incident portion 120 and an output portion 121 connected to the incident portion 120, the incident portion 120 is provided with an incident grating 120b, the incident grating 120b included in each waveguide plate 13 is used to respectively receive and diffract the light after being collimated by each projection lens 11, and the output portion 121 included in each waveguide plate 13 is arranged in correspondence, and the output portion 121 is used to output light.

[0066] Specifically, the display device 1 of the present application enables different light rays emitted by multiple light-emitting elements 10 to be projected toward the optical waveguide module 12 through the corresponding projection lenses 11 respectively, so as to be received by the optical waveguide module 12, and each light ray is merged and emitted through the optical waveguide module 12 to achieve light combination of different light rays, so that the display device 1 can be used to project a color image for the user to watch, thereby eliminating the light-combining prism between the light-emitting element 10 and the projection lens 11 in the related art, so as to reduce the size of the display device 1 along the optical axis P direction of the projection lens 11, so that the structure of the display device 1 is more compact and reasonable, so that the display device 1 can achieve a miniaturized design.

[0067] In addition, by arranging each light-emitting component 10 in one-to-one correspondence with each projection lens 11, and making the optical waveguide module 12 include a plurality of waveguide plates 13, each waveguide plate 13 is arranged in one-to-one correspondence with each projection lens 11, so that each waveguide plate 13 corresponds to each light-emitting component 10 one-to-one, so that each waveguide plate 13 is used to transmit the light emitted by each corresponding light-emitting component 10, that is, the light emitted by different light-emitting components 10 is separated and transmitted in different waveguide plates 13, which can avoid interference between different light rays during the transmission process, so as to improve the display effect of the display device 1.

[0068] It can be understood that the multiple light-emitting elements 10 can be Micro-LED (Micro-Light Emitting Diode) panels, so that the light-emitting elements 10 can be used to emit different lights for displaying patterns of different colors while making the volume of the light-emitting elements 10 smaller, thereby realizing a miniaturized design of the display device 1.

[0069] Furthermore, among the plurality of light-emitting elements 10 mentioned above, the light emitted by at least two light-emitting elements 10 is different means that: when the number of light-emitting elements 10 is greater than two, as long as the light emitted by two light-emitting elements 10 is different in color, the light emitted by the remaining light-emitting elements 10 may be the same color. Of course, the color of the light emitted by each light-emitting element 10 may be different. Exemplarily, when there are three light-emitting elements 10, the colors of the light emitted by the three light-emitting elements 10 may be different, for example, the three light-emitting elements 10 may emit red, blue, and green light, respectively. Alternatively, the colors of the light emitted by two light-emitting elements 10 may be different, while the color of the light emitted by another light-emitting element 10 may be the same as the color of the light emitted by any one of the two light-emitting elements 10. For example, two of the three light-emitting elements 10 may emit red light, while the other light-emitting element 10 may emit blue light.

[0070] Correspondingly, the number of the projection lenses 11 can be set corresponding to the number of the light emitting elements 10, so that each projection lens 11 is respectively set corresponding to each light emitting element 10. For example, when there are three light emitting elements 10, there can also be three projection lenses 11.

[0071] It can be understood that since the light-emitting element 10 and the projection lens 11 are arranged in a one-to-one correspondence, the projection lens 11 only needs to collimate the light emitted by one light-emitting element 10. In other words, it is only necessary to collimate the light emitted from one light source, and there is no need to collimate the light emitted by multiple light sources at different positions. Therefore, by ensuring that the one light-emitting element is located at the optimal position, the collimation accuracy of the light emitted by the projection lens 11 is higher for the light emitted by the one light-emitting element, that is, the collimation degree of the light collimated by the projection lens 11 is higher, so that the incident angle of the light to the incident grating 120b is more precise, so that the refraction efficiency of the incident grating 120b for the corresponding light is higher, thereby improving the display effect of the display device 1.

[0072] Further, considering that there are multiple projection lenses 11, the multiple projection lenses 11 can be arranged in a ring or a straight line. In order to make the multiple projection lenses 11 more compact, so that the structure of the display device 1 is more compact and reasonable, and to achieve a miniaturized design, the multiple projection lenses 11 can be arranged in a ring. Exemplarily, when there are three projection lenses 11, the three projection lenses 11 can be arranged in a triangle, so that the three projection lenses 11 are arranged more compactly, thereby making the structure of the display device 1 more compact, which is conducive to the miniaturized design of the display device 1. Of course, when there are more projection lenses 11, more projection lenses 11 can also be arranged in a ring shape such as a quadrilateral, a pentagon, or a circle.

[0073] Furthermore, as can be seen from the foregoing, the projection lens 11 is mainly used to collimate the light emitted by the light emitting element 10. Based on this, the projection lens 11 may include a lens barrel 110 and a lens 111 installed in the lens barrel 110. The object side end of each lens barrel 110 is located at the periphery of the corresponding light emitting element 10, and the lens 111 is arranged toward the light emitting element 10. The lens 111 is used to receive the light emitted by the corresponding light emitting element 10 and collimate it, so that the lens 111 can be fixed and encapsulated by the lens barrel 110, so that the projection lens 11 forms a stable overall structure.

[0074] Please also read Figures 4 to 6In some embodiments, it can be seen from the above that the light emitting element 10 of this embodiment is a Micro-LED panel. Since the Micro-LED panel is sensitive to heat, the display device 1 may also include a heat sink 15. The light emitting element 10 is arranged on the side of the heat sink 15 facing the projection lens 11. The heat sink 15 is used to carry the light emitting element 10. At the same time, the heat sink 15 can be used to reinforce the strength of the structure of the light emitting element 10 (for example, the flexible circuit board on the light emitting element) to reduce the deformation size of the light emitting element 10 caused by external force, thereby avoiding the use performance of the light emitting element 10 to be affected by a large deformation. Specifically, the heat sink 15 can be a thin plate structure made of a material with high hardness and thermal conductivity, such as steel or ceramics, so that while ensuring the strength of the heat sink 15, the heat sink 15 can also be used to accelerate the heat dissipation efficiency of the light emitting element 10, thereby avoiding the light emitting accuracy of the light emitting element 10 being affected or even causing damage to the light emitting element 10 due to the high working environment temperature, so as to ensure the quality of the pattern displayed by the light emitting element 10 and extend the service life of the light emitting element 10.

[0075] Furthermore, the heat sink 15 can be connected to the lens barrel 110 of the projection lens 11 to connect the light emitting element 10 to the projection lens 11 while preventing the light emitting element 10 from directly contacting the projection lens 11 to avoid damage to the light emitting element 10 during the connection process.

[0076] In some embodiments, the display device 1 may include one or more heat sinks 15. In an optional example, there may be one heat sink 15, and the plurality of light emitting elements 10 are all disposed on the heat sink 15. At the same time, the lens barrels of the plurality of projection lenses 11 are all connected to the heat sink 15, so that the plurality of light emitting elements 10, the plurality of projection lenses and the heat sink 15 form an integral structure, which can reduce the number of parts of the display device 1 and reduce the installation steps when the heat sink 15 is connected to the projection lens 11.

[0077] Considering that the patterns generated by different light beams that have not been combined are projected to the light incident portion 120 through the projection lens 11, and then transmitted to the light emitting portion 121 through the light transmission portion, the projection clarity of the light beams may be different, resulting in low quality of the color image projected from the light emitting portion 121. Based on this, if Figure 6 As shown, in another optional example, the display device 1 includes a plurality of heat sinks 15, and each light-emitting component 10 is respectively arranged on each heat sink 15, so that the relative position of each light-emitting component 10 is not fixed, and after each light-emitting component 10 is connected to the lens barrel 110 of each projection lens 11 through each heat sink 15, each projection lens 11 can also adjust its position relative to the optical waveguide module 12, so that after the pattern projections of different colors emitted by each light-emitting component 10 are transmitted through the projection lens 11 and the optical waveguide module 12, the quality of the projected images obtained is better, thereby improving the quality of the final projected synthesized color image.

[0078] Please also read Figure 4 , Figure 5 and Figure 7 In some embodiments, the display device 1 may further include a bracket 14, the bracket 14 may include a bearing portion 140 and a mounting portion 141 disposed on the bearing portion 140, the bearing portion 140 is provided with a first mounting cavity 140a, the mounting portion 141 is provided with a second mounting cavity 141a, the second mounting cavity 141a is communicated with the first mounting cavity 140a, a plurality of projection lenses 11 are disposed in the second mounting cavity 141a, the optical waveguide module 12 is at least partially disposed in the first mounting cavity 140a to receive light collimated by the projection lens 11, and the bracket 14 is respectively connected to the optical waveguide module 12 and the projection lens 11, so that the optical waveguide module 12 and the projection lens 11 are fixedly connected, so that the display device 1 can be formed into a structurally stable whole.

[0079] Optionally, there may be one or more second installation cavities 141 a. In an optional implementation, there is one second installation cavity 141 a, and each projection lens 11 is disposed in the one second installation cavity 141 a, so that the structure of the installation portion 141 is simple.

[0080] In another optional implementation, there may be a plurality of second mounting cavities 141a, and the number of the second mounting cavities 141a may be set corresponding to the number of projection lenses 11, so that each projection lens 11 can be installed in each corresponding second mounting cavity 141a, thereby increasing the connection area between the projection lens 11 and the mounting portion 141, so that the connection between the projection lens 11 and the mounting portion 141 is more stable. Figure 5 As shown, Figure 5 FIG. 4 shows that there are three second installation cavities 141 a , and each projection lens 11 is disposed corresponding to each second installation cavity 141 a .

[0081] Please also read Figure 5 and Figure 8Optionally, there may be multiple mounting parts 141, and each second mounting cavity 141a is disposed on each mounting part 141. For example, three mounting parts 141 may be disposed corresponding to three second mounting cavities 141a, and the three second mounting cavities 141a are disposed on the three mounting parts 141, respectively. The mounting parts 141 can be connected to each other so that the mounting parts 141 form a whole, so that the structure of the bracket 14 is more compact, or at least one mounting part 141 can be separately arranged from the remaining mounting parts 141, for example, one mounting part 141 among the multiple mounting parts 141 is separately arranged from the remaining mounting parts 141, or some of the mounting parts 141 among the multiple mounting parts 141 are separately arranged and the partial mounting parts 141 are separately arranged from the remaining mounting parts 141, or some of the mounting parts 141 among the multiple mounting parts 141 are connected and the partial mounting parts 141 are separately arranged from the remaining mounting parts 141, or the multiple mounting parts 141 are all separately arranged, so that the arrangement of the multiple mounting parts 141 is more flexible and can meet more different design and use requirements for the relative positions of the multiple mounting parts 141. Figure 5 As shown, Figure 5 The number of mounting parts 141 is shown to be three, and the three mounting parts 141 are connected and arranged. Figure 8 As shown, Figure 8 (a) shows that there are three mounting parts 141, among which one mounting part 141 is separately provided from the remaining two mounting parts 141, and the remaining two mounting parts 141 are connected to each other. Figure 8 (b) in the figure shows that there are six mounting parts 141, among which two mounting parts 141 are connected and arranged, and the remaining four mounting parts 141 are also connected and arranged, and the two mounting parts 141 are separately arranged from the remaining four mounting parts 141. Figure 8 (c) in the figure shows that there are six mounting parts 141, among which three mounting parts 141 are separately arranged, and the remaining three mounting parts 141 are connected and arranged, and the three mounting parts 141 are separately arranged from the remaining three mounting parts 141. Figure 8 (d) in the figure shows that there are three mounting parts 141, and the three mounting parts 141 are separately arranged.

[0082] As can be seen from the foregoing, the display device 1 can be applied to AR glasses, which generally include a lens, a frame, and a temple, wherein the lens is arranged in the frame, and the temple is connected to both sides of the frame. Based on this, in some embodiments, the optical waveguide module 12 can be formed as a lens of the AR glasses, the bearing portion 140 can be formed as at least part of the frame, the first mounting cavity 140a is located at a position of the frame for connecting to the temple, the mounting portion 141 can be formed as at least part of the temple, the second mounting cavity 141a is located at a portion of the temple for connecting to the frame and is connected to the first mounting cavity 140a, the projection lens 11 is at least partially located in the second mounting cavity 141a, and the image side end of the projection lens 11 can be arranged toward the first mounting cavity 140a, so that the light projected by the projection lens 11 can be directly projected to the part of the optical waveguide module 12 located in the first mounting cavity 140a, so that the loss rate of light during the transmission process is low, and the projection image quality projected by the projection lens 11 to the optical waveguide module 12 is high.

[0083] See also Fig. 9 Since the optical waveguide module 12 is mainly used for incident light to transmit and merge the light for output, the optical waveguide module 12 may include an incident portion 120 and an output portion 121 connected to the incident portion 120. An incident groove 120a is provided on the side of the incident portion 120 facing the projection lens 11, an incident grating 120b is provided on the side of the incident portion 120 facing away from the projection lens 11, and the incident grating 120b is arranged corresponding to the incident groove 120a, and an output grating 121a is provided on the side of the output portion 121 facing away from the projection lens 11. The incident groove 120a is used for each light beam collimated by the plurality of projection lenses 11 to enter the interior of the incident portion 120 and be diffracted by the incident grating 120b. The light beam diffracted by the incident grating 120b is transmitted through the interior of the optical waveguide module 12 to the exit grating 121a. The exit grating 121a is used to emit light beams, thereby realizing the function of transmitting and merging different light beams to be emitted to the human eye 4. Fig. 9 As shown in (a), Fig. 9 (a) in FIG. 1 shows that three different light rays are incident from the incident groove 120a into the incident portion 120 and are diffracted at the incident grating 120b, so as to be respectively transmitted to the incident groove 120a in the optical waveguide module 12 and merged and emitted. In order to distinguish the three different light rays, Fig. 9 (a) in FIG. 1 shows the optical paths of three different light rays in different line types. For example, Fig. 9 The dashed line with an arrow in (a) represents red light, the dashed line with an arrow represents blue light, and the dashed line with an arrow represents green light. It can be understood that the above light rays are only examples for ease of understanding and do not limit the scope of this embodiment.

[0084] As described above, the optical waveguide module 12 may include multiple layers of waveguide sheets 13, which may be stacked in sequence to separate different light rays and transmit them in different waveguide sheets 13, thereby avoiding mutual interference between different light rays during the transmission process, so as to improve the display effect of the display device 1.

[0085] For example, Fig. 9 As shown in (b) and (c) in FIG. 1 , the optical waveguide module 12 may include a plurality of waveguide sheets 13. The plurality of waveguide sheets 13 are stacked in sequence along the incident direction Q of the light. Each waveguide sheet 13 includes an incident portion 120 and an exit portion 121 connected to the incident portion 120. The incident portion 120 of each layer of waveguide sheet 13 is provided with the above-mentioned incident grating 120b. The exit portion 121 of each layer of waveguide sheet 13 is provided with an exit grating 121a. The exit gratings 121a on each layer of waveguide sheet 13 are correspondingly arranged. Thus, the optical waveguide module 12 can transmit different light through each waveguide sheet 13, avoid mutual interference between different light during the transmission process, thereby alleviating the phenomenon that different light during the transmission process changes, and further can improve the clarity of the color picture displayed by the display device 1. Fig. 9 As shown, Fig. 9 The arrow in shows the incident direction Q of the light.

[0086] Furthermore, in order to achieve the transmission of different light rays through each waveguide sheet 13, it is necessary to distinguish each light ray after each light ray enters the optical waveguide module 12. For the sake of convenience, it is defined that in each adjacent two layers of waveguide sheets 13 in the multi-layer waveguide sheet 13, one layer of waveguide sheets 13 is a first waveguide sheet 130, and the other layer of waveguide sheets 13 is a second waveguide sheet 131. Along the incident direction Q of the light ray, the second waveguide sheet 131 is stacked on the first waveguide sheet 130, so that the light ray that needs to be transmitted through the second waveguide sheet 131 must first pass through the first waveguide sheet 130 before it can be emitted to the second waveguide sheet 131. Therefore, when multiple light rays are emitted into the interior of the first waveguide sheet 130, the light ray that is transmitted through the first waveguide sheet 130 is made to remain in the interior of the first waveguide sheet 130, and the light ray that is transmitted through the second waveguide sheet 131 is made to be emitted from the interior of the first waveguide sheet 130 to enter the interior of the second waveguide sheet 131.

[0087] It can be seen that when the waveguide plate 13 is multi-layered, the number of layers of the waveguide plate 13 can be set according to the number of types of light that needs to be transmitted. For example, when the light that needs to be transmitted is two different light rays, the waveguide plate 13 can be two layers, and when the light that needs to be transmitted is three different light rays, the waveguide plate 13 can be three layers, and so on.

[0088] Since part of the light needs to pass through the non-corresponding waveguide plate 13 before it can reach the corresponding waveguide plate 13, as mentioned above, the light that needs to be transmitted through the second waveguide plate 131 must first pass through the first waveguide plate 130 before it can be emitted to the second waveguide plate 131. Therefore, the light that needs to be transmitted through the second waveguide plate 131 may be partially retained in the first waveguide plate 130 for transmission due to scattering, causing interference to the light that needs to be transmitted through the first waveguide plate 130, thereby causing the display quality of the display device 1 to be reduced.

[0089] Based on this, as described above, the present embodiment arranges a projection lens 11 to collimate the light emitted by the light emitting element 10, thereby improving the controllability of the incident angle of the light to the waveguide plate 13, reducing the scattering of the light in other directions, and reducing the possibility that part of the light is retained in the non-corresponding waveguide plate 13 for conduction when the light passes through the non-corresponding waveguide plate 13, thereby improving the display quality of the display device 1.

[0090] Furthermore, part of the waveguide plate 13 may also be provided with a shading portion 16, which may be a shading film such as a shading plastic film, a shading metal film, etc., or may be a shading material coating, such as a shading ink coating, a shading metal coating, etc. The shading portion 16 is provided at the incident portion 120, and the shading portion 16 is used to separate non-corresponding light from corresponding light to prevent the non-corresponding light retained in the waveguide plate 13 from propagating through the waveguide plate 13 and interfering with the corresponding light propagating in the waveguide plate 13.

[0091] Specifically, the first waveguide sheet 130 may be provided with a light shielding portion 16, and the light shielding portion 16 is provided in a surrounding manner corresponding to the light transmitted through the second waveguide sheet 131, so that when the light that needs to be transmitted through the second waveguide sheet 131 enters the first waveguide sheet 130, part of the scattered light can be shielded by the light shielding portion 16, so that it cannot be transmitted through the first waveguide sheet 130 together with other light, and thus cannot interfere with other light, so as to further improve the display quality of the display device 1. Furthermore, when the second waveguide sheet 131 is also provided with a light shielding portion 16, the light shielding portion 16 provided on the first waveguide sheet 130 should also be provided in a surrounding manner corresponding to the light shielding portion 16 provided on the second waveguide sheet 131, so that the light that needs to pass through the first waveguide sheet 130 and the second waveguide sheet 131 in sequence cannot be partially transmitted in the first waveguide sheet 130 and the second waveguide sheet 131, so as to further improve the display quality of the display device 1.

[0092] For example, if Fig. 9As shown in (b), the light is three types of light. Taking light I, light J and light K as examples, the waveguide sheet 13 is correspondingly divided into three layers. Along the incident direction Q of the light, the three-layer waveguide sheet 13 is sequentially a first waveguide sheet 13a, a second waveguide sheet 13b and a third waveguide sheet 13c. The first waveguide sheet 13a is used to correspond to the transmission of light I, the second waveguide sheet 13b is used to correspond to the transmission of light J, and the third waveguide sheet 13c is used to correspond to the transmission of light K. For ease of viewing, Fig. 9 (b) in FIG. 1 only shows the incident optical paths of the light I, the light J and the light K from the outside of the waveguide plate 13 to the corresponding waveguide plate 13, but does not show the optical paths of the light I, the light J and the light K being transmitted in the first waveguide plate 13a, the second waveguide plate 13b and the third waveguide plate 13c, and being emitted from each waveguide plate 13. The light shielding portion 16 provided on the second waveguide plate 13b is provided correspondingly around the light K to block part of the light K from being scattered and transmitted in the second waveguide plate 13b, and the light shielding portion 16 provided on the first waveguide plate 13a is provided correspondingly around the light I and the light shielding portion 16 of the second waveguide plate 13b to block part of the light I from being scattered and transmitted in the first waveguide plate 13a, and block part of the light K from being scattered and transmitted in the first waveguide plate 13a.

[0093] It can be understood that the incident grating 120b can be used to diffract a specific light, so that the specific light can be transmitted inside the waveguide sheet 13 including the incident grating 120b, while the remaining light can pass through the incident grating 120b and be emitted to the outside of the waveguide sheet 13. Based on this, the position of the incident grating 120b on each layer of the waveguide sheet 13 can be designed to achieve the effect that each layer of the waveguide sheet 13 can transmit different light respectively.

[0094] like Fig. 9As shown in (c) in the figure, in an optional implementation, each incident grating 120b can be used to diffract each different light beam and allow light beams other than the corresponding light beam to pass through, so as to distinguish each light beam and realize the function of transmitting each different light beam through each waveguide plate 13. Specifically, the projection of the incident grating 120b on the second waveguide plate 131 on the first waveguide plate 130 can be located within the range of the incident grating 120b on the first waveguide plate 130, so that the light that needs to be transmitted through the second waveguide plate 131 can be emitted toward the incident grating 120b included in the first waveguide plate 130 when it enters the first waveguide plate 130. Since the incident grating 120b can cause diffraction for the light transmitted in the first waveguide plate 130 and can also allow the light transmitted in the second waveguide plate 131 to pass through, the light transmitted in the second waveguide plate 131 can pass through the first waveguide plate 130 to be emitted into the second waveguide plate 131, thereby realizing the function of distinguishing different light rays and transmitting different light rays through each waveguide plate 13.

[0095] For example, if Fig. 9 As shown in (c), the light is three types of light, for example, red light, blue light, and green light, and the waveguide plate 13 is correspondingly three layers. Along the incident direction Q of the light, the three layers of waveguide plates 13 are waveguide plate No. 1 13a, waveguide plate No. 2 13b, and waveguide plate No. 3 13c in sequence. Then, the projection of the incident grating 120b on the waveguide plate No. 3 13c on the waveguide plate No. 2 13b is located within the range of the incident grating 120b on the waveguide plate No. 2 13b, and the projection of the incident grating 120b on the waveguide plate No. 2 13b on the waveguide plate No. 1 13a is located within the range of the incident grating 120b on the waveguide plate No. 1 13a. It can be seen that for the waveguide plate No. 3 13c, the projection of the incident grating 120b on it on the waveguide plate No. 1 13a is also located within the range of the incident grating 120b on the waveguide plate No. 1 13a.

[0096] Further, the incident groove 120a on the third waveguide plate 13c is arranged corresponding to the incident grating 120b on the third waveguide plate 13c, the incident groove 120a on the second waveguide plate 13b is arranged corresponding to the incident grating 120b on the second waveguide plate 13b, and the incident groove 120a on the first waveguide plate 13a is arranged corresponding to the incident grating 120b on the first waveguide plate 13a, that is, the range of the incident groove 120a on the first waveguide plate 13a should cover the position of the incident grating 120b on the first waveguide plate 13a, the range of the incident groove 120a on the second waveguide plate 13b should cover the position of the incident grating 120b on the second waveguide plate 13b, and the range of the incident groove 120a on the third waveguide plate 13c should cover the position of the incident grating 120b on the third waveguide plate 13c.

[0097] like Fig. 9 As shown in (d), in another optional implementation, as described above, different light rays are projected toward the optical waveguide module 12 through each projection lens 11, that is, the incident positions of different light rays in the optical waveguide module 12 are different. Based on this, the incident gratings 120b on each layer of the waveguide sheet 13 can be staggered so that each incident grating 120b is respectively arranged corresponding to the incident position of each different light ray, so as to diffract each different light ray and enable each different light ray to be conducted in each waveguide sheet 13 respectively.

[0098] It can be understood that since each incident grating 120b is only used to receive corresponding light, in other words, no other non-corresponding light is directed to each incident grating 120b. Therefore, there is no possibility that non-corresponding light is diffracted by the incident grating 120b, thereby being able to avoid the situation where light is conducted by non-corresponding waveguide plates 13 to a greater extent, thereby further improving the display quality of the display device 1.

[0099] Optionally, at this time, the incident grating 120b can be used to diffract all light rays incident on the incident grating 120b itself. Compared with a grating structure that is only used to diffract corresponding light rays and allows non-corresponding light rays to pass through, the structure of the incident grating 120b is simpler, the manufacturing difficulty of the waveguide plate 13 is lower, and the cost of the waveguide plate 13 can be reduced.

[0100] It is understandable that the incident positions corresponding to other light rays on part of the waveguide plate 13 can be formed into a structure that allows all light rays to pass through, for example, an incident through hole 130a can be provided, or a solid structure with extremely high light transmittance can be formed to allow other light rays to pass through.

[0101] Please combine Fig.10 As shown, in this embodiment, the first waveguide plate 130 is provided with an incident through hole 130a, and the projection of the incident grating 120b on the second waveguide plate 131 on the first waveguide plate 130 is located within the range of the incident through hole 130a, so that the light transmitted in the second waveguide plate 131 can first pass through the incident through hole 130a before emitting to the incident grating 120b included in the second waveguide plate 131, so as to pass through the first waveguide plate 130, and then directly emit to the incident grating 120b, so as to be transmitted in the second waveguide plate 131. By providing the incident through hole 130a to avoid the incident path of other light, other light can be allowed to pass through, while reducing the loss of other light when passing through the non-corresponding waveguide plate 13, so as to further improve the image projection quality of the display device 1. Among them, Fig.10 Three different rays are shown in Fig. 9 The light path conducted in the optical waveguide module 12 structure shown in (d) is shown in FIG. 1 , and for ease of viewing, Fig.10Some numbers are omitted.

[0102] Specifically, Fig.10 FIG. 2 shows that the waveguide plate 13 has three layers. Along the incident direction Q of the light, the three waveguide plates 13 are waveguide plate No. 13a, waveguide plate No. 2 13b and waveguide plate No. 3 13c. Both waveguide plate No. 1 13a and waveguide plate No. 2 13b are provided with incident through holes 130a, while waveguide plate No. 3 13c is not provided with incident through holes 130a. The projection of the incident through holes 130a on the waveguide plate No. 2 13b on the waveguide plate No. 1 13a is located within the range of the incident through holes 130a on the waveguide plate No. 1 13a, that is, the range of the incident through holes 130a on the waveguide plate No. 1 13a covers the position of the incident through holes 130a and the incident grating 120b on the waveguide plate No. 2 13b, and correspondingly, the range of the incident through holes 130a on the waveguide plate No. 2 13b covers the position of the incident grating 120b on the waveguide plate No. 3 13c.

[0103] Further, the incident groove 120a on the first waveguide plate 13a is arranged corresponding to the incident grating 120b on the first waveguide plate 13a, the incident groove 120a on the second waveguide plate 13b is arranged corresponding to the incident grating 120b on the second waveguide plate 13b, and the incident groove 120a on the third waveguide plate 13c is arranged corresponding to the incident grating 120b on the third waveguide plate 13c, that is, the range of the incident groove 120a on the first waveguide plate 13a should cover the position of the incident grating 120b on the first waveguide plate 13a, the range of the incident groove 120a on the second waveguide plate 13b should cover the position of the incident grating 120b on the second waveguide plate 13b, and the range of the incident groove 120a on the third waveguide plate 13c should cover the position of the incident grating 120b on the third waveguide plate 13c.

[0104] Furthermore, taking the three light rays, namely the first light ray I, the second light ray J and the third light ray K as an example, the optical paths of the three light rays in the optical waveguide module 12 are described in detail.

[0105] Specifically, the first light ray I is emitted toward the waveguide plate No. 13a along the incident direction Q of the light ray, and enters the interior of the incident portion 120 of the waveguide plate No. 13a through the incident groove 120a on the waveguide plate No. 13a, and then diffracts at the incident grating 120b on the waveguide plate No. 13a, so as to be conducted inside the waveguide plate No. 13a to the exit grating 121a on the waveguide plate No. 13a and emitted toward the human eye 4 through the exit grating. The second light ray J is emitted toward the waveguide plate No. 13a along the incident direction Q of the light ray, and passes through the incident through hole 130a on the waveguide plate No. 13a to be emitted toward the incident groove 120a of the waveguide plate No. 2 13b, so that the second light ray J enters the incident grating 120b of the waveguide plate No. 2 13b and is diffracted, so as to be conducted inside the waveguide plate No. 2 13b to the exit grating 121a on the waveguide plate No. 2 13b and emitted from the waveguide plate No. 2 13b, and passes through the waveguide plate No. 1 13a to be emitted from the waveguide plate No. 1 13a together with the first light ray I, so as to be emitted toward the human eye 4. The third light ray K is emitted toward the waveguide plate No. 13a along the incident direction Q of the light ray, and passes through the incident through hole 130a on the waveguide plate No. 13a and the incident through hole 130a on the waveguide plate No. 2 13b in sequence to be emitted toward the incident groove 120a of the waveguide plate No. 3 13c, so that the third light ray K enters the incident grating 120b of the waveguide plate No. 3 13c and is diffracted, so as to be conducted inside the waveguide plate No. 3 13c to the exit grating 121a on the waveguide plate No. 3 13c, and is emitted from the waveguide plate No. 3 13c, and passes through the waveguide plate No. 2 13b and the waveguide plate No. 1 13a in sequence, so as to be emitted from the waveguide plate No. 1 13a together with the second light ray J and the first light ray I, so as to be emitted toward the human eye 4.

[0106] It is understandable that as long as the optical waveguide module 12 includes a plurality of waveguide sheets 13, for example, two, three, four, five or more waveguide sheets 13, it can be used to achieve the separate transmission of at least one light, so as to alleviate the phenomenon that different light rays change during the transmission process, so as to improve the clarity of the color picture displayed by the display device 1. When the number of waveguide sheets 13 is equal to the number of different light rays transmitted, the change of different light rays during the transmission process is the smallest, and the quality of the color picture displayed by the display device 1 is the highest. The embodiment does not specifically limit the number of waveguide sheets 13 included in the optical waveguide module 12, and the specific correspondence between the number of waveguide sheets 13 and the number of different light rays.

[0107] The display device 1 of the present application realizes light combination of different light rays by allowing different light rays emitted by multiple light-emitting elements 10 to be projected toward the optical waveguide module 12 through the corresponding projection lenses 11 respectively, so as to be received by the optical waveguide module 12, and each light ray is merged and emitted through the optical waveguide module 12, so as to enable the display device 1 to be used to project a color image for the user to watch, thereby eliminating the light-combining prism between the light-emitting element 10 and the projection lens 11 in the related art, so as to reduce the size of the display device 1 along the optical axis P direction of the projection lens 11, so as to make the structure of the display device 1 more compact and reasonable, so that the display device 1 can be miniaturized.

[0108] Furthermore, by making the optical waveguide module 12 include multiple waveguide plates 13, and making each waveguide plate 13 correspondingly transmit the different light rays projected by each projection lens 11, that is, separating the different light rays and transmitting them in different waveguide plates 13, it is possible to avoid mutual interference between the different light rays during the transmission process, thereby improving the display effect of the display device 1.

[0109] In addition, considering that the patterns generated by different light rays that have not been combined are projected to the light incident portion 120 through the projection lens 11 and then transmitted to the light emission portion 121 through the light transmission portion, the projection clarity may be different, resulting in poor quality of the color image projected from the light emission portion 121. Therefore, the present application provides a plurality of heat sinks 15 for carrying each light emitting component 10, so that the relative positions of the light emitting components 10 can be adjusted, so that the relative positions of the projection lenses 11 connected to the light emitting components 10 through the heat sinks 15 can also be adjusted, so that the active alignment adjustment of each projection lens 11 and the optical waveguide module 12 can be performed respectively, so that the projection images obtained after the patterns of different colors emitted by each light emitting component 10 are transmitted through the projection lens 11 and the optical waveguide module 12 are of better quality, thereby improving the quality of the composite image emitted from the light emission portion 121.

[0110] Please also read Fig.11 and Fig.12 , Fig.11 is a flow chart of a method for packaging a display device disclosed in the second aspect of the embodiment of the present application, Fig.12 1 is a schematic diagram of a packaging process of a packaging method for a display device disclosed in a second aspect of an embodiment of the present application. In a second aspect, an embodiment of the present application provides a packaging method for a display device 1 as described in the first aspect above, comprising the following steps:

[0111] S1. Provide a plurality of light-emitting components and a plurality of projection lenses, and package each light-emitting component with each projection lens respectively.

[0112] Please combine Fig.14As shown, as mentioned above, the display device 1 may further include a heat sink 15. Based on this, step S1 may include:

[0113] S10, providing a heat sink and a plurality of light-emitting components, and placing the plurality of light-emitting components on the heat sink. Fig.12 As shown in (a) and (b), Fig.12 (a) shows the structure of the heat sink 15. Fig.12 (b) shows that the light emitting element 10 is arranged on the heat dissipation plate 15 .

[0114] Optionally, the light emitting element 10 may be mounted on the heat sink 15 by gluing, thereby eliminating the need to change the structure and shape of the light emitting element 10 , and the connection structure between the light emitting element 10 and the heat sink 15 occupies a small space.

[0115] S11, providing a plurality of projection lenses, corresponding each projection lens to each light emitting element, and fixing and packaging the projection lenses on a heat sink.

[0116] Specifically, the projection lens 11 may include a lens barrel 110 and a lens 111 installed in the lens barrel 110. The object side end of each lens barrel 110 may be located at the periphery of the corresponding light emitting element 10 and fixedly connected to the heat sink 15, and the lens 111 is arranged toward the light emitting element 10. The lens 111 is used to receive and collimate the light emitted by the corresponding light emitting element 10, so as to realize that each projection lens 11 is fixedly packaged on the heat sink 15 corresponding to each light emitting element 10, such as Fig.12 As shown in (c), Fig.12 (c) shows that the object side end of the lens barrel 110 is located at the outer periphery of the corresponding light emitting element 10 and is fixedly connected to the heat dissipation plate 15 , and the lens 111 is arranged toward the light emitting element 10 .

[0117] In addition, as mentioned above, the heat sink 15 may also include a plurality of heat sinks 15 , each heat sink 15 being used to mount each light emitting element 10 . In this case, each lens barrel 110 may also be fixedly packaged on each heat sink 15 .

[0118] S2. Provide an optical waveguide module.

[0119] like Fig.12 As shown in (d) in Fig.12(d) in FIG. 1 shows the optical waveguide module 12. Optionally, the optical waveguide module 12 may include an incident portion 120 and an exit portion 121 connected to the incident portion 120, wherein an incident groove 120a is provided on the side of the incident portion 120 facing the projection lens 11, an incident grating 120b is provided on the side of the incident portion 120 facing away from the projection lens 11, and the incident grating 120b is arranged corresponding to the incident groove 120a, and an exit grating 121a is provided on the side of the exit portion 121 facing away from the projection lens 11, the incident groove 120a is used for each light beam collimated by a plurality of projection lenses 11 to enter the interior of the incident portion 120 and be diffracted by the incident grating 120b, and the exit grating 121a is used for emitting light beams, thereby realizing the function of conducting different light beams and merging and emitting them.

[0120] From the first aspect of the embodiment of the present invention, it can be known that the optical waveguide module 12 can be a single-layer waveguide plate 13 structure so that different light rays are conducted in the same structure, or the optical waveguide module 12 can include multiple layers of waveguide plates 13 to separate different light rays and conduct them in different waveguide plates 13, thereby avoiding mutual interference between different light rays during the conduction process, so as to improve the display effect of the display device 1.

[0121] Please combine Fig.13 and Fig.14 As shown, when the waveguide sheet 13 has a multi-layer structure, step S2 may include the following steps:

[0122] S20, providing a plurality of waveguide plates, each waveguide plate comprising an incident portion and an exit portion 121 connected to the incident portion, the incident portion being provided with an incident grating, and the exit portion 121 being provided with an exit grating. Fig.14 As shown in (a), Fig.14 (a) in FIG. 1 shows three waveguide plates 13 .

[0123] S21, stacking a plurality of waveguide sheets, and setting the output gratings on each layer of waveguide sheets accordingly, to obtain an optical waveguide module. Fig.14 As shown in (b), Fig.14 (b) in the figure shows that three waveguide plates 13 are stacked and arranged, and the output grating 121a on each layer of the waveguide plates 13 is arranged correspondingly.

[0124] Optionally, OCA (Optically Clear Adhesive) optical glue may be coated between two adjacent waveguide sheets 13 to fix the two adjacent waveguide sheets 13 together through the OCA optical glue, thereby fixing the plurality of waveguide sheets 13 together to form a stable overall structure, thereby stabilizing the structure of the optical waveguide module 12.

[0125] As described above, each incident grating 120b of each waveguide plate 13 can be used to diffract different light rays and allow light rays other than the corresponding light rays to pass through so as to distinguish each light ray and realize the function of transmitting different light rays through each waveguide plate 13. Alternatively, the incident gratings 120b on each layer of the waveguide plate 13 can be staggered so that each incident grating 120b is respectively arranged corresponding to the incident position of each different light ray to diffract each different light ray and enable each different light ray to be transmitted in each waveguide plate 13 respectively.

[0126] Taking the example that the incident gratings 120b on each layer of the waveguide sheet 13 are staggered so that each incident grating 120b is respectively arranged corresponding to the incident position of each different light ray, so as to diffract each different light ray, so that each different light ray can be respectively conducted in each waveguide sheet 13, and incident through holes 130a are provided on some waveguide sheets 13 corresponding to the incident positions of other light ray to allow other light ray to pass through, for the sake of convenience of explanation, it is defined that in each adjacent two layers of the multi-layer waveguide sheet 13, one layer of the waveguide sheet 13 is a first waveguide sheet 130, and the other layer of the waveguide sheet 13 is a second waveguide sheet 131, and along the incident direction Q of the light ray, the second waveguide sheet 131 is stacked on the first waveguide sheet 130, as shown in FIG. Fig.14 As shown in (b), Fig.14 In (b), the arrow shows the incident direction Q of the light.

[0127] Specifically, an incident through hole 130a is provided on the first waveguide plate 130, and the projection of the incident grating 120b on the second waveguide plate 131 on the first waveguide plate 130 is located within the range of the incident through hole 130a, so that the light transmitted in the second waveguide plate 131 can first pass through the incident through hole 130a before being emitted to the incident grating 120b included in the second waveguide plate 131, so as to pass through the first waveguide plate 130, thereby directly emitting to the incident grating 120b, so as to be transmitted in the second waveguide plate 131. By setting the incident through hole 130a to avoid the incident path of other light rays, other light rays can be allowed to pass through while reducing the loss of other light rays when passing through the non-corresponding waveguide plate 13, thereby further improving the image projection quality of the display device 1.

[0128] Further, Fig.14(b) shows that the waveguide plate 13 has three layers. Along the incident direction Q of the light, the three waveguide plates 13 are the first waveguide plate 13a, the second waveguide plate 13b and the third waveguide plate 13c. The first waveguide plate 13a and the second waveguide plate 13b are both provided with incident through holes 130a, while the third waveguide plate 13c is not provided with the incident through hole 130a. The incident through hole 130a on the second waveguide plate 13b is located on the first waveguide plate 13a. The projection on the plate 13a is located within the range of the incident through hole 130a on the first waveguide plate 13a, that is, the range of the incident through hole 130a on the first waveguide plate 13a must cover the position of the incident through hole 130a and the incident grating 120b on the second waveguide plate 13b, and correspondingly, the range of the incident through hole 130a on the second waveguide plate 13b must cover the position of the incident grating 120b of the third waveguide plate 13c.

[0129] Further, the incident groove 120a on the first waveguide plate 13a is arranged corresponding to the incident grating 120b on the first waveguide plate 13a, the incident groove 120a on the second waveguide plate 13b is arranged corresponding to the incident grating 120b on the second waveguide plate 13b, and the incident groove 120a on the third waveguide plate 13c is arranged corresponding to the incident grating 120b on the third waveguide plate 13c, that is, the range of the incident groove 120a on the first waveguide plate 13a should cover the position of the incident grating 120b on the first waveguide plate 13a, the range of the incident groove 120a on the second waveguide plate 13b should cover the position of the incident grating 120b on the second waveguide plate 13b, and the range of the incident groove 120a on the third waveguide plate 13c should cover the position of the incident grating 120b on the third waveguide plate 13c.

[0130] Please also read Fig.12 and Fig.13 As mentioned above, the display device 1 may further include a bracket 14. Therefore, after step S1, the following steps may be further included:

[0131] S22, providing a bracket, the bracket comprising a load-bearing portion and a mounting portion connected to each other, the load-bearing portion having a first mounting cavity, the mounting portion having a second mounting cavity, and the second mounting cavity being connected to the first mounting cavity. Fig.12 As shown in (e), Fig.12 (e) in FIG. 1 shows the structure of the bracket 14 .

[0132] S23, partially connect the optical waveguide module to the bearing part, make the incident part located in the first installation cavity, and fix the optical waveguide module to the bracket. Fig.12 As shown in (f) in Fig.12 (f) in FIG. 1 shows that the optical waveguide module 12 is partially connected to the carrier portion 140 , and the incident portion 120 is located in the first installation cavity 140 a .

[0133] Optionally, the optical waveguide module 12 can be fixed to the bearing portion 140 by gluing or plugging, so that the optical waveguide module 12 is firmly connected to the bracket 14 without changing the structural shape of the optical waveguide module 12, thereby ensuring that the normal use function of the optical waveguide module 12 is not affected.

[0134] S3, actively align the projection lens and the optical waveguide module. Fig.12 As shown in (g) and (h), Fig.12 (g) shows the structure before the projection lens 11 and the optical waveguide module 12 are actively aligned. Fig.12 (h) shows the structure after the projection lens 11 and the optical waveguide module 12 are actively aligned.

[0135] Therefore, by adjusting the relative positions of the projection lens 11 and the optical waveguide module 12 , the projection lens 11 can project onto the optical waveguide module 12 , and the quality of the projection pattern transmitted and merged by the optical waveguide module 12 can be improved, thereby improving the display quality of the display device 1 .

[0136] It is understandable that in the related art, since it is necessary to combine the light emitted by multiple light-emitting components through a light-combining prism to project the combined light to a projection lens, and then project it to the optical waveguide module through the projection lens, during the assembly process of the display device in the related art, even if the projection lens and the optical waveguide module are actively aligned, the multiple light-emitting components can only be adjusted together with the projection lens, that is, it is impossible to make the light emitted by each light-emitting component obtain the best projection quality, thereby improving the projection quality of the projected combined light pattern. Based on this, the display device 1 disclosed in the embodiment of the present invention, by arranging each light-emitting component 10 corresponding to each projection lens 11, so that the light emitted by each light-emitting component 10 is projected to the optical waveguide module 12 respectively, and at the same time, by arranging a plurality of heat dissipation plates 15 respectively connected to each light-emitting component 10, so that the positions between each light-emitting component 10 are not fixed, so that the relative positions between each projection lens 11 are not fixed, and therefore, each projection lens 11 and the optical waveguide module 12 can be actively aligned respectively.

[0137] Based on this, when the display device 1 includes a plurality of heat sinks 15 respectively connected to the light emitting elements 10, the step S3 of actively aligning the plurality of projection lenses 11 with the optical waveguide module 12 includes:

[0138] S30, actively aligning each projection lens with the optical waveguide module.

[0139] Therefore, by adjusting the relative positions of the projection lenses 11 and the optical waveguide module 12, the projection patterns projected by the projection lenses 11 to the optical waveguide module 12 and transmitted and merged by the optical waveguide module 12 are of optimal quality, so that the quality of the merged pattern displayed by the display device 1 is optimized.

[0140] S4, encapsulating the projection lens and the optical waveguide module to obtain a display device.

[0141] It is understandable that, since the optical waveguide module 12 has been packaged and fixed to the bearing portion 140 of the bracket 14, and the light emitting element 10 has been packaged with the projection lens 11, it is only necessary to connect the projection lens 11 to the bracket 14 to connect the projection lens 11 to the optical waveguide module 12, and the installation process and installation method of the projection lens 11 are simple. Specifically, step S4 may include:

[0142] S40, connecting the outer periphery of the lens barrel of the projection lens to the mounting portion of the bracket and sealing and fixing them to obtain a display device.

[0143] Optionally, the outer periphery of the lens barrel 110 can be fixedly connected to the cavity wall of the second mounting cavity 141a of the mounting portion 141 by gluing, so that the projection lens 11 and the optical waveguide module 12 can be fixed together while eliminating the connection gap between the projection lens 11 and the mounting portion 141, thereby preventing impurities from entering between the projection lens 11 and the optical waveguide module 12 through the connection gap between the projection lens 11 and the mounting portion 141, and preventing the image projected by the projection lens 11 to the optical waveguide module 12 from generating a black shadow, thereby improving the image display quality of the display device 1.

[0144] It can be seen that the packaging method of the display device 1 provided in the second aspect of the embodiment of the present invention can realize packaging and fixing each projection lens 11 corresponding to each light-emitting component 10, and packaging and fixing each projection lens 11 corresponding to the incident part 120 of the optical waveguide module 12, so that the display device 1 can receive the light emitted by each light-emitting component 10 through each projection lens 11, collimate each light respectively and project it to the incident part 120 of the optical waveguide module 12, so as to merge and emit each light through each optical waveguide module 12, realize light combination of different light, so that the display device 1 can be used to project a color image, and the display device 1 can not include the light combining prism in the related art, and the structure of the display device 1 is more compact and reasonable, and a miniaturized design can be realized.

[0145] Furthermore, before the projection lens 11 and the optical waveguide module 12 are packaged and fixed together, the projection lens 11 and the optical waveguide module 12 are actively aligned so that the projection lens 11 is projected onto the optical waveguide module 12, and the projection pattern transmitted and merged by the optical waveguide module 12 is of better quality, thereby improving the display quality of the display device 1.

[0146] In addition, by providing a plurality of heat sinks 15 to respectively carry a plurality of light emitting elements 10, the projection lenses 11 corresponding to the light emitting elements 10 fixedly packaged on the heat sinks 15 can move relative to each other, so that by adjusting the relative positions of the projection lenses 11 and the optical waveguide module 12, the projection patterns projected by the projection lenses 11 to the optical waveguide module 12 and transmitted and merged by the optical waveguide module 12 are of the best quality, so that the quality of the merged pattern displayed by the display device 1 is the best.

[0147] See also Fig.15 , Fig.15 The third aspect of the present invention discloses a head-mounted device 2, including the display device 1 described in the first aspect. The head-mounted device 2 may include but is not limited to glasses (such as goggles, swimming goggles, myopia glasses, hyperopia glasses or reading glasses, etc.) with AR (Augmented Reality) display function, helmets, masks, etc. Please refer to the following figure for details. Figure 3 and Figure 4 As shown, taking the head-mounted device 2 as an AR glasses as an example, the AR glasses generally include lenses, a frame and temples, the lenses are arranged on the frame, the temples are connected to one side of the frame, the optical waveguide module 12 can be formed as at least a part of the lenses of the glasses, the light incident part 120 of the optical waveguide module 12 is located on the side of the frame for connecting to the temples, the light emitting part of the optical waveguide module 12 is used to project light to the eyes of the user wearing the glasses, the projection lens 11 and the light emitting part 10 can be arranged inside the temples, and located at one end of the temples for connecting to the frame, the temples of the glasses can be connected to the inside of the frame, so that the light projected by the projection lens 11 can be projected to the light incident part 120 of the optical waveguide module 12.

[0148] It can be understood that since the display device 1 is used to project images corresponding to one eye of the user, in order to enable both eyes of the user to see the images projected by the display device 1, the head-mounted device 2 may include two display devices 1, and the two display devices 1 are respectively used to project images to the two eyes of the user.

[0149] By using the display device 1 disclosed in the first aspect of the embodiment of the present invention, the structure of the head mounted device 2 can be made more compact and reasonable, thereby realizing a miniaturized design of the head mounted device 2. In addition, the AR display quality of the head mounted device 2 can be improved, and the use performance of the head mounted device 2 can be improved.

[0150] The display device, head-mounted device and packaging method of the display device disclosed in the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the display device, head-mounted device and packaging method of the display device of the present invention and their core ideas; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A display device, It is characterized in that The display device comprises: A plurality of light-emitting elements, wherein at least two of the plurality of light-emitting elements emit different light; A plurality of projection lenses, each of which is arranged in one-to-one correspondence with each of the light-emitting elements, and each of the projection lenses is used to receive and collimate the light emitted by the corresponding light-emitting element; and An optical waveguide module, the optical waveguide module is used to receive each light beam collimated by the multiple projection lenses and merge the light beams for output. The optical waveguide module includes a plurality of waveguide sheets. Along the incident direction of the light beam, the plurality of waveguide sheets are stacked in sequence, and each waveguide sheet is arranged in a one-to-one correspondence with each projection lens. Each waveguide sheet includes an incident portion and an output portion connected to the incident portion. The incident portion is provided with an incident grating. The incident grating included in each waveguide sheet is used to respectively receive and diffract the light beams collimated by the projection lenses. The output portions included in each waveguide sheet are correspondingly arranged. An output grating is provided on the side of the output portion away from the projection lens. The output grating on each layer of the waveguide sheet is correspondingly arranged, and the output grating is used to output light beams.

2. The display device according to claim 1, It is characterized in that An incident groove is provided on a side of the incident portion facing the projection lens, and an incident grating is provided on a side of the incident portion facing away from the projection lens, and the incident grating is arranged corresponding to the incident groove; The incident groove is used for allowing each light beam collimated by the plurality of projection lenses to enter the interior of the incident portion and be diffracted by the incident grating.

3. The display device according to claim 1, It is characterized in that In every two adjacent layers of the multi-layer waveguide plates, one layer of the waveguide plates is a first waveguide plate, and the other layer of the waveguide plates is a second waveguide plate. Along the incident direction of the light, the second waveguide plate is stacked on the first waveguide plate, and the projection of the incident grating on the second waveguide plate on the first waveguide plate is located within the range of the incident grating on the first waveguide plate.

4. The display device according to claim 1, It is characterized in that The incident gratings on each layer of the waveguide plates are staggered.

5. The display device according to claim 4, It is characterized in that In every two adjacent layers of the multi-layer waveguide plates, one layer of the waveguide plates is a first waveguide plate, and the other layer of the waveguide plates is a second waveguide plate. Along the incident direction of the light, the second waveguide plate is stacked on the first waveguide plate, and an incident through hole is provided on the first waveguide plate. The projection of the incident grating on the second waveguide plate on the first waveguide plate is located within the range of the incident through hole.

6. The display device according to claim 1, It is characterized in that The display device also includes a bracket, the bracket includes a bearing portion and a mounting portion arranged on the bearing portion, the bearing portion is provided with a first mounting cavity, the mounting portion is provided with a second mounting cavity, the second mounting cavity is communicated with the first mounting cavity, a plurality of the projection lenses are arranged in the second mounting cavity, and the optical waveguide module is at least partially arranged in the first mounting cavity to receive the light collimated by the projection lens.

7. The display device according to claim 6, It is characterized in that There are multiple mounting parts, and the mounting parts are connected to each other, or at least one mounting part is separately arranged from the remaining mounting parts; There are a plurality of the second installation cavities, each of which is disposed in each of the installation parts, and each of the projection lenses is disposed in each of the second installation cavities.

8. The display device according to any one of claims 1 to 7, It is characterized in that The display device further comprises a heat sink, and each of the light emitting elements is arranged on a side of the heat sink facing the projection lens; or, The display device further comprises a plurality of heat dissipation plates, and each of the light emitting elements is respectively arranged on a side of each of the heat dissipation plates facing the projection lens.

9. The display device according to claim 8, It is characterized in that The projection lens includes a lens barrel and a lens installed in the lens barrel, the object side end of the lens barrel is located at the outer periphery of the corresponding light-emitting component and is fixedly connected to the heat dissipation plate, the lens is arranged toward the light-emitting component, and the lens is used to receive and collimate the light emitted by the corresponding light-emitting component.

10. The display device according to any one of claims 1 to 7, It is characterized in that The plurality of projection lenses are arranged in a ring or in a straight line.

11. A method for packaging a display device according to any one of claims 1 to 10, It is characterized in that The method comprises: Providing a plurality of light-emitting components and a plurality of projection lenses, and packaging each of the light-emitting components with each of the projection lenses; Providing an optical waveguide module; Actively aligning the projection lens and the optical waveguide module; The projection lens and the optical waveguide module are packaged to obtain the display device.

12. The packaging method of a display device according to claim 11, It is characterized in that When the display device includes a plurality of heat sinks respectively connected to the light emitting elements, the step of actively aligning the plurality of projection lenses with the optical waveguide module includes: Each of the projection lenses is actively aligned with the optical waveguide module.

13. A head mounted device, It is characterized in that Comprising the display device as described in any one of claims 1-10.

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