Manufacturing method of augmented reality display module and augmented reality display module

Abstract

The invention provides a manufacturing method of an augmented reality display module and the augmented reality display module, and the method comprises the steps: providing a first mold which comprises a first plane and a convex surface, the convex surface is convex relative to the first plane, providing a second mold which comprises a second plane and a ring surface, the ring surface surrounds the second plane and is not coplanar with the second plane, a first side wall is further arranged on the first mold and / or the second mold so as to form a containing cavity in the first mold and / or the second mold, and the first side wall is perpendicular to the first plane and the second plane; the first mold and the second mold are aligned, so that the convex surface and the second plane are coaxially aligned; a molten light-transmitting material is injected between the first mold and the second mold; the first mold and the second mold are pressed so that the fused light-transmitting material can be fully attached to the first plane and the protruding face and the second plane and the annular face; and the first mold and the second mold are demolded, the lens body formed after the light-transmitting material is cured is obtained, the process is not prone to causing damage to the module, and the cost is low.

Description

Technical Field

[0001] The present application belongs to the field of augmented reality display technology, and more specifically, to a method for manufacturing an augmented reality display module and an augmented reality display module. Background Art

[0002] AR is the abbreviation of Augmented Reality, which is a technology that combines virtual information with the real world. The optical module is one of the core components of AR products, and is mainly responsible for the imaging of AR products. AR is different from VR. Although their optical display systems are usually composed of micro-displays and optical components, and both use a series of optical imaging components to form a distant virtual image of the pixels on the display and project it into the human eye, the difference is that AR products require see-through - both seeing the real external world and seeing virtual information.

[0003] AR devices generally include a micro display and an optical module. The micro display is used to provide display content. For the optical module, the mainstream AR display technology currently uses waveguide technology. The waveguide couples the light projected by the micro display into its own glass substrate, and transmits the light coupling like a transmission channel to the front of the eye through the principle of "total reflection", and then releases the light into the human eye through the decoupling part. Of course, there is also PRISM technology, which uses a prism to directly reflect the light from the micro display into the human eye. At the same time, external light can also enter the human eye from the outside through the prism.

[0004] The inventors of the present application have discovered that conventional modules generally use a cutting process to form an optical module, but the above method easily results in a waste of raw materials, greatly increasing the production cost of the augmented reality display module. Summary of the invention

[0005] The embodiments of the present application provide a method for manufacturing an augmented reality display module and an augmented reality display module.

[0006] In a first aspect, an embodiment of the present application provides a method for manufacturing an augmented reality display module, comprising:

[0007] A first mold is provided, the first mold comprising a first plane and a convex surface, the convex surface is convex relative to the first plane,

[0008] Providing a second mold, the second mold comprising a second plane and an annular surface, the annular surface surrounds the second plane and is not coplanar with the second plane, wherein the first mold and / or the second mold provided is further provided with a first side wall to form an accommodating cavity on the first mold and / or the second mold, and the first side wall is perpendicular to the first plane and the second plane;

[0009] aligning the first mold and the second mold so that the convex surface and the second plane are coaxially aligned and the first plane and the second plane are parallel;

[0010] injecting molten light-transmitting material between the first mold and the second mold;

[0011] The first mold and the second mold are pressed together so that the molten light-transmitting material is fully fitted with the first plane and the convex surface, the second plane and the annular surface; and the second plane is free to overflow the excess material, etc.)

[0012] The first mold and the second mold are demolded to obtain a mirror body formed after the light-transmitting material is cured, wherein the first end of the mirror body includes a first flat wall and a recessed wall lower than the first flat wall, the second end of the mirror body opposite to the first end includes a second flat wall and an annular wall, the second flat wall is parallel to the first flat wall, the annular wall surrounds the second flat wall, and the mirror body also includes a second side wall connecting the first flat wall and the annular wall.

[0013] In a second aspect, an embodiment of the present application provides an augmented reality display module, which is manufactured by any one of the manufacturing methods of the first aspect above.

[0014] The method comprises providing a first mold, the first mold comprising a first plane and a convex surface, the convex surface being convex relative to the first plane, providing a second mold, the second mold comprising a second plane and an annular surface, the annular surface surrounding the second plane and not coplanar with the second plane, wherein the first mold and / or the second mold provided are further provided with a first side wall to form a receiving cavity on the first mold and / or the second mold, the first side wall being perpendicular to the first plane and the second plane; aligning the first mold and the second mold so that the convex surface and the second plane are coaxially aligned, and the first plane and the second plane are parallel; and injecting molten light-transmitting material into between the first mold and the second mold;

[0015] The first mold and the second mold are pressed together so that the molten light-transmitting material fully fits with the first plane and the convex surface, the second plane and the annular surface; the first mold and the second mold are demoulded to obtain a mirror body formed after the light-transmitting material is solidified, wherein the first end of the mirror body includes a first flat wall and a concave wall lower than the first flat wall, the second end of the mirror body opposite to the first end includes a second flat wall and an annular wall, the second flat wall is parallel to the first flat wall, the annular wall surrounds the second flat wall, and the mirror body also includes a second side wall connecting the first flat wall and the annular wall. The above method does not need to cut the optical mirror body material, reduces the loss of raw materials, and greatly reduces the production cost.

[0016] Other aspects and advantages of the embodiments of the present disclosure will be set forth in part in the following description, or may be learned from the description, or may be learned through practice of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of a process of an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a mold structure of an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0020] Figure 3 A structural schematic diagram of injecting molten material in an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of mold pressing of an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of the mirror body after demoulding according to an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the upward-looking structure of the mirror body after demoulding according to an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the upward-looking structure of the mirror body after demoulding according to another embodiment of the method for manufacturing the augmented reality display module provided in the embodiment of the present application;

[0025] Figure 8 A schematic diagram of the coating structure of an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of a coating structure of another embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0027] Fig.10 A schematic diagram of the structure of installing a micro display in an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0028] Fig.11 A schematic diagram of the structure of cutting of an embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0029] Fig.12 A schematic diagram of the structure of an embodiment of an augmented reality display module provided in an embodiment of the present application;

[0030] Fig.13 A schematic diagram of a mold structure of another embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application;

[0031] Fig.14 A schematic diagram of a mold structure of another embodiment of a method for manufacturing an augmented reality display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] The manufacturing method of the augmented reality display module provided in the embodiment of the present application is now described.

[0037] refer to Figure 1-14 , the manufacturing method of the augmented reality display module includes:

[0038] S10, providing a first mold 20, wherein the first mold 20 comprises a first plane 22 and a convex surface 21, wherein the convex surface 21 is convex relative to the first plane 22,

[0039] It can be understood that the arrangement of the raised surface 21 and the first plane 22 can be that the raised surface 21 and the first plane 22 are alternately arranged, and the raised surface 21 is located at the center of the first plane. Of course, there can also be more first planes 22 between two raised surfaces 21, that is, the spacing between adjacent raised surfaces 21 can be designed as needed.

[0040] S20. Provide a second mold 30, the second mold 30 includes a second plane 31 and an annular surface 32, the annular surface 32 surrounds the second plane 31 and is not coplanar with the second plane 31, wherein the provided first mold 20 and / or second mold 30 is also provided with a first side wall 33 to form a accommodating cavity 40 on the first mold 20 and / or the second mold 30.

[0041] The second plane 31 may be at the center of the annular surface 32, and there may be a gap between two adjacent annular surfaces 32, so as to facilitate the subsequent cutting after die molding. It can be understood that the first side wall 33 may be arranged around the first mold 20 to form a receiving cavity 40. Optionally, the first side wall 33 may be arranged around the second mold 30 to form a receiving cavity 40. In some embodiments, the first side wall 33 may be arranged around the first mold 20 and the second mold 30 at the same time to form a small receiving cavity 40 on each mold. The small receiving cavity 40 may be combined to form a large complete receiving cavity 40. The first side wall 33 may be perpendicular to the first plane 22 and the second plane 31. In some embodiments, the receiving cavity 40 may be a whole large one, and the above-mentioned related surfaces are arranged inside the corresponding receiving cavity 40 or in the area of ​​the vertical projection of the corresponding receiving cavity 40. Optionally, the formed receiving cavity 40 may be a plurality of small receiving cavities 40 arranged in an array.

[0042] S30, aligning the first mold 20 and the second mold 30 so that the convex surface 21 and the second plane 31 are coaxially aligned, and the first plane 22 and the second plane 31 are parallel;

[0043] A clamp 10 or a positioning jig 10 can be used to align the first mold 20 and the second mold 30 to ensure that the raised surface 21 and the second plane 31 are coaxially aligned. The first plane 22 and the second plane 31 can both be flat surfaces, and after the molds are aligned, the two are parallel to each other, wherein the lateral dimension of the second plane 31 can be greater than or equal to the lateral dimension of the raised surface 21.

[0044] S40, injecting molten light-transmitting material between the first mold 20 and the second mold 30;

[0045] It can be understood that there may be a gap between the first mold 20 and the second mold 30, or one or both of the first mold 20 and the second mold 30 may be provided with an injection hole, and the molten light-transmitting material may be injected through the gap or the injection hole, wherein the molten light-transmitting material may be a transparent molten material, for example, any one of polymethyl methacrylate, polycarbonate, plastic, resin or glass.

[0046] S50, pressing the first mold 20 and the second mold 30 together so that the molten light-transmitting material is fully attached to the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32;

[0047] The first mold 20 and the second mold 30 can be clamped by a fixture, one of which can be positioned and fixed, and then the other mold can be pressed in a fixed direction. For example, the mold with the accommodating cavity 40 can be fixed, and then the other mold can be pressed by a pressure mechanism. In some embodiments, the two molds can also be controlled to move toward each other and pressed. Pressing can make the molten material fully fit with the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32, and this process can overflow the excess molten material.

[0048] In some embodiments, the distance between the first plane 22 and the second plane 31 is also controlled during the lamination process. If the preset distance is reached, the lamination is stopped. If the preset distance is not reached, the lamination is controlled to reach the preset distance. The distance formed by lamination is controlled so that the lamination-formed mirror body 50 meets the required design size. Optionally, if there are multiple arrays of accommodating cavities 40, multiple arrays of mirror bodies 50 are finally formed. Therefore, in order to facilitate subsequent batch operations, such as batch transportation, clamping, etc., it is necessary to ensure that there is a connection structure between two adjacent mirror bodies, that is, the lamination process also needs to control the thickness of the connection structure. If it is too thin, the overall structural strength is insufficient, and if it is too thick, it is not conducive to subsequent cutting. In some embodiments, the lamination process also includes controlling the gap height between two adjacent accommodating cavities 40 (that is, the connection structure of the two adjacent mirror bodies 50 formed in the end), and the gap height can be 100 microns, 300 microns, 400 microns or 500 microns, etc.

[0049] S60, demolding the first mold 20 and the second mold 30 to obtain a mirror body 50 formed after the light-transmitting material is cured, wherein the first end of the mirror body 50 includes a first flat wall 52 and a recessed wall 51 lower than the first flat wall 52, and the second end of the mirror body 50 opposite to the first end includes a second flat wall 53 and an annular wall 54, the second flat wall 53 is parallel to the first flat wall 52, the annular wall 54 surrounds the second flat wall 53, and the mirror body 50 also includes a second side wall 55 connecting the first flat wall 52 and the annular wall 54.

[0050] After the molten light-transmitting material is sufficiently cooled, the mold can be separated by a clamp 10 or the like, and the molded mirror bodies 50 can be multiple separate ones, or of course, multiple connected array ones. The shape of the mirror body 50 can be cylindrical.

[0051] In some embodiments, before demolding the first mold 20 and the second mold 30, it also includes judging whether the temperature of the injected molten light-transmitting material has dropped below the corresponding solidification point. If so, demolding can be performed. If not, cooling needs to be continued, for example, by using air cooling, water cooling or natural heat dissipation.

[0052] The present application provides a method for manufacturing an augmented reality display module, wherein each mold is provided with a corresponding convex surface 21 and a first plane 22, a second plane 31 and an annular surface 32, and then the two molds are aligned to ensure that the convex surface 21 and the second plane 31 are coaxially arranged in the accommodating cavity 40, and the first plane 22 and the second plane 31 are parallel, and molten light-transmitting material is injected and then the mold is pressed together to finally make the molten material fully fit with the convex surface 21 and the second plane 31 / the first plane 22 and the second plane 31, and after curing, the mold is demolded to form a mirror body 50 of the desired design. The above method does not require cutting of each surface of the raw material to form the desired designed surface, reduces material loss, and has low cost. In addition, no cutting or other processing is required, and it is not easy to cause optical impact on the mirror body 50.

[0053] In some embodiments, reference Figure 2 The first mold 20 provided includes a plurality of first planes 22 arranged in an array and a plurality of raised surfaces 21 arranged in an array. The second mold 30 provided includes a plurality of second planes 31 arranged in an array and a plurality of annular surfaces 32 arranged in an array. It can be understood that the size of each raised surface 21 is the same, the size of each first plane 22 is the same, the size of each second plane 31 is the same, and the size of each annular surface 32 is the same. In other embodiments, the size of each raised surface 21, first plane 22, second plane 31, and annular surface 32 may also be different. For example, the size of the raised surface 21, the first plane 22, the second plane 31, and the annular surface 32 gradually increases or decreases along the first direction. It can be understood that the convex surface 21 and the annular surface 32 include any one or a combination of inclined surfaces, spherical surfaces, aspherical surfaces or free-form surfaces. The shape of the recessed wall 51 is complementary to the shape of the convex surface 21, and the shape of the annular wall 54 is complementary to the annular surface 32. It can be understood that complementarity is opposite or identical matching shapes. For example, if one of them is a convex surface, the other is a concave surface. If one of the surfaces is a plane, the other is also a plane. The shape of the first plane 22 is the same as the shape of the first flat wall 52, and the shape of the second plane 31 is the same as the shape of the second flat wall 53.

[0054] In some embodiments, the size of the accommodating cavity 40 can be between 0.4 cubic millimeters and 4 cubic centimeters, for example, 0.4 cubic millimeters, 1 cubic millimeter, 8 cubic millimeters, 1 cubic centimeter, 2 cubic centimeters, 4 cubic centimeters, etc. The space is so small that the size of the single mirror body 50 finally formed appears relatively small to the naked eye, and it is relatively easy to integrate into various other devices, such as glasses or other head-mounted devices, etc., without affecting the appearance or large-area structure of the original device, and has a good adaptation space.

[0055] In some embodiments, reference Figure 2 , 13 -14, the first mold 20 and / or the second mold 30 provided is also provided with a third side wall 34, the third side wall 34 is parallel to the first side wall 33, and the third side wall 34 divides the accommodating cavity 40 into the accommodating cavities 40 arranged in an array. The plurality of third side walls 34 may be a part of the first mold 20, or a part of the second mold 30, and of course, may also be independent parts arranged on the first mold 20 or the second mold 30, wherein the height of the third side wall 34 is the same as the height of the first side wall 33, and the third side wall 34 may be arranged in the first mold 20 and / or the second mold 30 and located between the first side walls 33, and the plurality of third side walls 34 are arranged at intervals to separate the accommodating cavities 40. For example, the first side wall 33 and the third side wall 34 can be provided in both molds to form the accommodating cavity 40 on both molds. In this case, the depth of the molten material entering the accommodating cavity 40 and fitting with the design surface can be reduced. It can be understood that the third side wall 34 can block the molten light-transmitting material from entering, so that the solidified molten material has a gap 57 ( Figure 5 ), when forming e.g. Figure 6 When the optical module array shown in FIG. 7 is formed, the cutting position can be found quickly, which is beneficial to the subsequent cutting of the optical module array. In addition, the gap 57 is also beneficial for clamping or positioning by a clamp or the like.

[0056] In some embodiments, reference Figure 8-9 After the mirror body 50 is formed by solidifying the light-transmitting material, it also includes coating the recessed wall 51 and the annular wall 54 with a reflective layer 541. Physical vapor deposition or chemical vapor deposition, such as mask coating, sputtering coating or ion plating, can be used to set a metal or metal alloy reflective layer 541 on the recessed wall 51 and the annular wall 54.

[0057] In some embodiments, continue to refer to Figure 5 , 8-9, coating the recessed wall 51 and the annular wall 54 with a reflective layer includes: providing a first baffle 60, the first baffle 60 includes a first sub-baffle 62 and a second sub-baffle 64, there is a gap between the first sub-baffle 62 and the second sub-baffle 64, the first sub-baffle 62 and the second sub-baffle 64 have different heights and sizes; it can be understood that the second sub-baffle 64 is not on the same straight line, but is close to the area to be shielded, so as to reduce the probability of the reflective material entering the side wall of the mirror body 50 when the reflective layer 541 is coated on the annular wall 54.

[0058] The first sub-baffle 60 blocks the gap 57 between two adjacent mirror bodies 50, wherein the fixture 10 can be clamped in the gap 57, so that the entire array can be more stable, wherein the size of the second sub-baffle 62 can be the same as the second flat wall 53, so as to block the second flat wall 53, and the size of the transverse gap between the first sub-baffle 62 and the second sub-baffle 64 corresponds to the width of the ring wall 54, that is, the distance of the gap is equal to the distance between two adjacent second flat walls 53, and the metal or metal alloy reflective layer 541 is evaporated from the gap to the ring wall 54;

[0059] A second baffle 61 is provided, the first baffle 60 has a different structure from the second baffle 61, the second baffle 61 includes a third sub-baffle 63 and a fourth sub-baffle 65, a gap is provided between the third sub-baffle 63 and the fourth sub-baffle 65, and the third sub-baffle 63 and the fourth sub-baffle 65 have the same height;

[0060] The size of the third sub-baffle 63 can be greater than or equal to the first flat wall 52, thereby blocking the first flat wall 52. The fourth sub-baffle 65 spans two adjacent first flat walls 52. The gap between the third sub-baffle 63 and the fourth sub-baffle 65, or the gap between the fourth sub-baffle 65 and the fourth sub-baffle 65 corresponds to the width of the recessed wall 51, that is, the distance of the gap is equal to the width of the recessed wall 51, and a metal or metal alloy reflective layer 511, such as silver, aluminum, aluminum-magnesium alloy, etc., is evaporated from the gap to the recessed wall 51.

[0061] In some embodiments, reference Fig.10After the recessed wall 51 and the ring wall 54 are plated with a reflective layer, the method further includes: installing a micro display 70 on each second flat wall 53, the micro display 70 and the second flat wall 53 are closely attached, and the lateral size of the micro display 70 is less than or equal to the lateral size of the second flat wall 53. The micro display 70 can be Micro-LED (Micro Light-Emitting Diode), uLED (Micro Light Emitting Diode), Micro-oled (Micro Organic Light-Emitting Diode), LCoS (Liquid Crystal On Silicon), LCD (Liquid Crystal Display), DMD (Digital Micromirror Device) / DLP (Digital Light Processing) or LBS (Laser Beam Scanning), etc., or any combination of these technologies. The mirror body 50 can be fixed by a clamp 10 , and the optical glue 72 can be coated on the surface of the second flat wall 53 or the micro display 70 , and then the micro display 70 can be clamped by the clamp 10 and bonded to the second flat wall 53 .

[0062] In some other embodiments, the microdisplay 700 may also be installed before coating.

[0063] The microdisplay 70 further includes a back plate 71, which is located on the side of the microdisplay 70 away from the second flat wall 53 and is electrically connected to the microdisplay 70. The back plate 71 is used to connect a driving power source. The back plate 71 can be a driving board such as a circuit board, which can be rigid or flexible. The back plate 71 is used to connect a driving power source to provide electrical drive for the microdisplay 70. The back plate 71 can be greater than or equal to the microdisplay 20 (e.g., a light emitting device). Optionally, the back plate 71 can also be a part of the microdisplay 70.

[0064] In some embodiments, reference Fig.11 After the micro display 70 is mounted on each second flat wall 53, the method further includes: cutting the connection structure between two adjacent mirror bodies 50 in a direction perpendicular to the first flat wall 52 to separate the mirror bodies 50. The clamp 10 can be used to fix one side with the micro display 70, and the mirror body 50 to be processed can be cut along the edge of the first flat wall 52 to ensure that the side wall 55 is not cut too much or damaged, etc. The cutting method can be mechanical or laser cutting, etc.

[0065] In some embodiments, reference Fig.12After cutting the connection structure between two adjacent mirror bodies 50 to separate them into independent mirror bodies 50, the method further includes: encapsulating the single mirror body 50 with an encapsulating material 80 to expose the first flat wall 52, wherein the encapsulating material is opaque and may be a coating or material such as black epoxy resin, black silicone rubber, carbon black, nickel black, black chrome or Vanta black. It can be understood that, the side wall 55 and the ring wall 54 of the mirror body 50 are encapsulated, and a black or opaque sealing sleeve 80 can be used to encapsulate and keep the first flat wall 52 exposed. Of course, injection molding and other processes can also be used to put the above-mentioned mirror body 50 into a mold and inject black or opaque glue to achieve encapsulation and keep the first flat wall 52 exposed. In some embodiments, at least a portion of the back plate 71 is exposed relative to the encapsulating material 80, so as to facilitate electrical connection with external electrical components (such as batteries or drive boards, etc.).

[0066] In some embodiments, reference Figure 3-4 , pressing the first mold 20 and the second mold 30 further includes: determining whether the distance D2 between the first plane 22 and the second plane 31 during pressing meets the preset value, if so, not continuing pressing, otherwise pressing to the preset distance. It can be understood that the distance D2 is conducive to the formation of the connection structure 56 between the two adjacent mirror bodies 50, and the thickness of the distance D2 can be between 100-500 microns.

[0067] In some embodiments, in conjunction with Figure 6-7 The connection layer 56 is arranged along the entire circumference of each optical module 10 so that the entire array can be more stable. In some embodiments, the connection layer 56 is arranged at intervals along the circumference of each optical module 10 so that the injected light-transmitting material can be reduced and the cost can be reduced. It can be understood that the connection layer 56 is formed by the distance D2 of the above embodiment, and the thickness of the connection layer 11 can be 100-500 microns. This ensures the overall structural strength of the optical module array and does not make it difficult to perform mechanical cutting later.

[0068] Optionally, see Figure 3-4 , the position of the distance D2 is not flush with the second plane 31. It can be understood that since the annular surface 32 is outside the second plane 31, it is not a regular vertical surface. In order to ensure that the annular surface 32 can still maintain any one or combination of the expected designed inclined surface, spherical surface, aspherical surface or free-form surface during the pressing process, that is, to reduce the deformation of the annular surface 32 in the process of forming the annular wall 54 due to the overflow process being too close to the gap D2, it is necessary to ensure that the gap opening is as far away from the annular surface 32 as possible, that is, to ensure that the cross section in the direction of the vertical gap line is not flush with the annular surface 32, for example, higher or lower than the position of the gap D1 or D2, which is conducive to maintaining the formation of the reference surface of the annular surface.

[0069] In some embodiments, the gap D2 may not exist, and the mirror body 50 after demolding is a single independent existence, rather than an array formed by the connection structure 56. This facilitates the flexible selection of a single mirror body 10 in the subsequent process.

[0070] In some embodiments, reference Fig.12 , and also includes providing a light-transmitting protective layer 90; the light-transmitting protective layer 90 can be PMMA (polymethyl methacrylate), PC (polycarbonate) plastic, resin glass, etc.

[0071] The light-transmitting protective layer 90 is covered on the first flat wall 52 and the recessed wall 51, and the size of the light-transmitting protective layer 90 is greater than or equal to the size of the first flat wall 52. Optical glue can be used to bond the light-transmitting protective layer 90 and the first flat wall 52. The light-transmitting protective layer 90 does not change the propagation path of the original light, and can protect the first flat wall 52 and the recessed wall 51, reduce wear on them, and reduce the entry of dust and other debris to affect their optical efficiency. In some embodiments, the size of the light-transmitting protective layer 90 can be the same as the size of the opaque packaging material 90, so that the overall structure is more regular, which is conducive to subsequent assembly.

[0072] Combined with reference Fig.12 The present application also provides an augmented reality display module embodiment, and the augmented reality display module 200 is made by the manufacturing method of the above embodiment. The augmented reality module display group as a whole can be cylindrical or prismatic. The entire size can be between 0.5 cubic millimeters and 5 cubic centimeters, such as 0.5 cubic millimeters, 1 cubic millimeter, 8 cubic millimeters, 1 cubic centimeter, 2 cubic centimeters, 5 cubic centimeters, etc. Its size is relatively small to the naked eye, and it is relatively easy to integrate into various other devices without affecting the appearance or large-area structure of the original device. For example, the augmented reality display can be used in myopia glasses, hyperopia glasses, sunglasses, goggles, smart glasses or other head-mounted devices, etc., and has a good adaptation space.

[0073] The augmented reality display module manufacturing method and augmented reality display module of the present application can package and manufacture optical modules and microdisplays, streamline the process flow, reduce the cutting of raw materials, reduce the preparation cost, and also reduce the risk of damage to optical components due to cutting. Ultimately, an augmented reality display module with a small size and high optical utilization is produced, which has good application prospects.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing an augmented reality display module, characterized in that: include: A first mold (20) is provided, wherein the first mold (20) comprises a first plane (22) and a convex surface (21), wherein the convex surface (21) is convex relative to the first plane (22), A second mold (30) is provided, wherein the second mold (30) comprises a second plane (31) and an annular surface (32), wherein the annular surface (32) surrounds the second plane (31) and is not coplanar with the second plane (31), wherein the first mold (20) and / or the second mold (30) provided is further provided with a first side wall (33) to form a receiving cavity (40) on the first mold (20) and / or the second mold (30), and the first side wall (33) is perpendicular to the first plane (22) and the second plane (31); Aligning the first mold (20) and the second mold (30) so that the convex surface (21) and the second plane (31) are coaxially aligned, and the first plane (22) and the second plane (31) are parallel; injecting molten light-transmitting material between the first mold (20) and the second mold (30); Pressing the first mold (20) and the second mold (30) together so that the molten light-transmitting material is fully in contact with the first plane (22) and the convex surface (21), the second plane (31) and the annular surface (32); The first mold (20) and the second mold (30) are demolded to obtain a mirror body (50) formed after the light-transmitting material is solidified, wherein the first end of the mirror body (50) includes a wall complementary to the shape of the convex surface (21), and the second end of the mirror body (50) includes a wall complementary to the annular surface (32).

2. The method for manufacturing an augmented reality display module according to claim 1, wherein: The first mold (20) provided comprises a plurality of first planes (22) arranged in an array and a plurality of convex surfaces (21) arranged in an array; the second mold (30) provided comprises a plurality of second planes (31) arranged in an array and a plurality of annular surfaces (32) arranged in an array; the convex surfaces (21) and the annular surfaces (32) comprise any one or a combination of inclined surfaces, spherical surfaces, aspherical surfaces or free-form surfaces; the first end of the mirror body (50) comprises a first flat wall (52) and a concave wall (51) lower than the first flat wall (52); The second end of the body (50) opposite to the first end includes a second flat wall (53) and an annular wall (54), the second flat wall (53) is parallel to the first flat wall (52), and the annular wall (54) surrounds the second flat wall (53), the mirror body (50) further includes a second side wall (55) connecting the first flat wall (52) and the annular wall (54), the shape of the first plane (22) is the same as the shape of the first flat wall (52), and the shape of the second plane (31) is the same as the shape of the second flat wall (53).

3. The method for manufacturing an augmented reality display module according to claim 2, wherein: The first mold (20) and / or the second mold (30) provided is also provided with a third side wall (34), the third side wall (34) is parallel to the first side wall (33), and the third side wall (34) divides the accommodating cavity (40) into accommodating cavities (40) arranged in an array.

4. The method for manufacturing an augmented reality display module according to claim 2, wherein: After obtaining the mirror body (50) formed by solidifying the light-transmitting material, the method further comprises coating the recessed wall (51) and the annular wall (54) with a reflective layer.

5. The method for manufacturing an augmented reality display module according to claim 4, wherein: After coating the recessed wall (51) and the annular wall (54) with a reflective layer, the method further comprises: A microdisplay (70) is mounted on each of the second flat walls (53), the microdisplay (70) and the second flat wall (53) are tightly fitted, and the lateral dimension of the microdisplay (70) is less than or equal to the lateral dimension of the second flat wall (53).

6. The method for manufacturing an augmented reality display module according to claim 5, characterized in that: After the micro display (70) is installed on each of the second flat walls (53), the method further includes: cutting the connection structure between two adjacent mirror bodies (50) in a direction perpendicular to the first flat wall (52) to separate the mirror bodies (50).

7. The method for manufacturing an augmented reality display module according to claim 6, wherein: After cutting the connection structure between two adjacent mirror bodies (50) to separate them into independent mirror bodies (50), the method further includes: packaging the single mirror body (50) with a packaging material to expose the first flat wall (52), wherein the packaging material is opaque.

8. The method for manufacturing an augmented reality display module according to claim 1, wherein: Before demoulding the first mold (20) and the second mold (30), the method further includes determining whether the temperature of the light-transmitting material is below the solidification point, and if so, demoulding is performed; if not, the temperature of the light-transmitting material is controlled to be below the solidification point.

9. The method for manufacturing an augmented reality display module according to claim 1, wherein: The pressing of the first mold (20) and the second mold (30) further includes: determining whether the distance between the first plane (22) and the second plane (31) during pressing meets a preset value, and if so, not continuing the pressing; otherwise, pressing to the preset distance.

10. The method for manufacturing an augmented reality display module according to claim 4, wherein: The coating of the reflective layer on the recessed wall (51) and the annular wall (54) comprises: Providing a first baffle (60), the first baffle (60) comprising a first sub-baffle (62) and a second sub-baffle (64), a gap being provided between the first sub-baffle (62) and the second sub-baffle (64), and the first sub-baffle (62) and the second sub-baffle (64) having different heights and sizes; The first sub-baffle (62) blocks the gap (57) between two adjacent mirror bodies (50), the second sub-baffle (62) blocks the second flat wall (53), the gap corresponds to the annular wall (54), the distance of the gap is equal to the distance between two adjacent second flat walls (53), and a metal or metal alloy reflective layer is evaporated from the gap to the annular wall (54); providing a second baffle (61), wherein the structure of the first baffle (60) is different from that of the second baffle (61), the first baffle (61) comprising a third sub-baffle (63) and a fourth sub-baffle (65), a gap being provided between the third sub-baffle (63) and the fourth sub-baffle (65), and the third sub-baffle (63) and the fourth sub-baffle (65) having the same height; The third sub-baffle (63) blocks the first flat wall (52), the fourth sub-baffle (65) spans two adjacent first flat walls (52), the gap corresponds to the recessed wall (51), the distance of the gap is equal to the width of the recessed wall (51), and a metal or metal alloy reflective layer is evaporated from the gap to the recessed wall (51).

11. The method for manufacturing an augmented reality display module according to claim 4, wherein: Also includes: Providing a light-transmitting protective layer (90); The light-transmitting protective layer (90) is covered on the first flat wall (52) and the recessed wall (51), and the size of the light-transmitting protective layer (90) is greater than or equal to the size of the first flat wall (52).

12. An augmented reality display module, characterized in that: The augmented reality display module is manufactured by the manufacturing method described in any one of claims 1-11.

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