Method for manufacturing optical module, method for manufacturing near-eye display device

Abstract

Some embodiments of the present disclosure provide a manufacturing method of an optical module and a near-eye display device. The manufacturing method of the optical module comprises: attaching a first reflective film to a first surface of a first lens; attaching a second reflective film to a first surface of a first prism or a second surface of a second prism; gluing the first prism, the second prism and the first lens, wherein the first prism, the second prism and the first lens are arranged in sequence along a first direction, the first surface of the first prism is a surface close to the second prism in the first direction, the second surface of the second prism is a surface close to the first prism in the first direction, and the first surface of the first lens is a surface away from the second prism in the first direction; and cutting the glued member.

Description

Technical Field

[0001] This disclosure relates to the field of near-eye display technology, and more specifically, to a method for manufacturing an optical module and a method for manufacturing a near-eye display device. Background Technology

[0002] Augmented Reality (AR) is a technology that overlays and merges virtual scenes or information with the real physical environment, presenting them interactively to the user, thereby creating a shared space between the virtual and real worlds. Essentially, AR is a new type of interface technology that integrates positioning, presentation, and interaction technologies in both hardware and software. Its purpose is to allow users to perceive the spatiotemporal connection and fusion of virtual and real spaces, thereby enhancing their perception and understanding of the real environment.

[0003] From an application perspective, optical imaging solutions in AR near-eye display technology mainly include coaxial holographic lenses (also known as Birdbath), freeform surfaces, off-axis holographic lenses, and waveguides. In recent years, the Birdbath solution has gradually become the mainstream solution in the market due to its advantages such as low cost, simple structure, small size, and good imaging effect. While pursuing increasingly smaller sizes, the requirements for the image quality of the displayed image are also becoming increasingly stringent. However, the more complex optical structure design usually requires complex manufacturing processes, and stray light introduced during manufacturing is difficult to eliminate, which is detrimental to improving the image quality of the displayed image. Summary of the Invention

[0004] This disclosure provides methods for manufacturing optical modules and near-eye display devices that can at least partially solve the above-mentioned technical problems or other technical problems in the art.

[0005] In a first aspect, embodiments of this disclosure provide a method for manufacturing an optical module. The method includes: attaching a first reflective film to a first surface of a first lens; attaching a second reflective film to a first surface of a first prism or a second surface of a second prism; bonding the first prism, the second prism, and the first lens together, wherein the first prism, the second prism, and the first lens are arranged sequentially along a first direction, the first surface of the first prism is the surface closer to the second prism in the first direction, the second surface of the second prism is the surface closer to the first prism in the first direction, and the first surface of the first lens is the surface away from the second prism in the first direction; and cutting the bonded component.

[0006] In an exemplary embodiment, the second reflective film includes a polarizing reflective film. Before bonding the first prism, the second prism, and the first lens, the manufacturing method further includes attaching a phase retardation film to the second surface of the first lens, wherein the first surface and the second surface of the first lens are opposite to each other in a first direction.

[0007] In an exemplary embodiment, cementing the first prism, the second prism, and the first lens further includes cementing the second lens and the first lens together, wherein the second lens is located on the side of the first lens facing away from the second prism in a first direction.

[0008] In an exemplary embodiment, the manufacturing method further includes: applying a light-shielding treatment to the surfaces of the cut glued part other than the opposing surfaces in the first direction and the non-glued surfaces of the second prism.

[0009] In an exemplary embodiment, the light-shielding process includes: blackening other surfaces or covering other surfaces with a black film.

[0010] In an exemplary embodiment, cutting the glued part after bonding includes: machining the overall shape of the glued part.

[0011] In an exemplary embodiment, cutting the glued component includes performing at least one of the following steps: at least partially removing the edge portion of the first prism around the first direction; at least partially removing the edge portion of the second prism around the first direction; and at least partially removing the edge portion of the first lens around the first direction.

[0012] In an exemplary embodiment, the first surface of the first lens is a convex surface, and the surface of the first lens near the second prism in a first direction is a plane.

[0013] In an exemplary embodiment, the surface of the second lens that is away from the first lens in the first direction is a plane, and the surface of the second lens that is close to the first lens in the first direction is a concave surface.

[0014] In an exemplary embodiment, the opposing surfaces of the first prism in the first direction are both planar; the opposing surfaces of the second prism in the first direction are both planar.

[0015] In an exemplary embodiment, the first prism is disposed perpendicular to the first direction and away from the surface of the second prism, and the first surface of the first prism is disposed at an angle to the first direction; the surface of the second prism is disposed perpendicular to the first direction and away from the surface of the first prism.

[0016] In an exemplary embodiment, the first reflective film includes a semi-transparent and semi-reflective film.

[0017] Secondly, embodiments of this disclosure provide a method for manufacturing a near-eye display device. The method includes: forming an optical module according to the optical module manufacturing method mentioned in any of the above embodiments; and setting an image source in a direction perpendicular to the non-bonded surface of a second prism in the optical module.

[0018] According to the manufacturing method of the optical module and the manufacturing method of the near-eye display device provided in the embodiments of this disclosure, after attaching a first reflective film to the first surface of the first lens and attaching a second reflective film to the first surface of the first prism or the second surface of the second prism, the first prism, the second prism, and the first lens with relatively regular shapes are first glued together to form an integral glued part. Then, the glued part is cut into a preset shape to meet the appearance requirements of different near-eye display devices. This can reduce the difficulty of the glued process, improve the glued yield, and also help improve the adaptability. Since there is no need to perform irregular processing and / or edge cutting on individual optical elements, the processing difficulty of individual optical elements can be reduced and the processing yield of individual optical elements can be improved.

[0019] On the other hand, since there is no need for irregular shaping and / or edge cutting of individual optical elements, there are no chamfers and / or rounded corners between adjacent surfaces of individual optical elements, nor are there step surfaces between adjacent optical elements. The optical module has a flat shape without step surfaces, which helps to reduce the difficulty of light-shielding processing and improve efficiency. It can also prevent stray light problems caused by incomplete coating, thereby helping to improve image quality. In addition, there is no need to set positioning structures (e.g., positioning protrusions and / or positioning recesses) on the bonding surface of individual optical elements, thereby reducing the risk of image source light leakage to the outside, thus achieving the goal of improving image quality. Attached Figure Description

[0020] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the optical module provided in the embodiments of this disclosure;

[0022] Figure 2 yes Figure 1 The diagram shows the optical path of the optical module.

[0023] Figure 3 This is a schematic flowchart of a method for manufacturing an optical module according to an embodiment of this disclosure;

[0024] Figure 4 This is a three-dimensional structural diagram of the first prism, the second prism, the first lens, and the second lens after being glued together, according to an embodiment of this disclosure.

[0025] Figure 5 This is a three-dimensional structural diagram of the cut glued part provided in an embodiment of this disclosure;

[0026] Figure 6 This is a three-dimensional structural diagram of a cut glued part provided in another embodiment of this disclosure;

[0027] Figure 7 This is a schematic diagram of the optical path of the optical module provided in the embodiments of this disclosure;

[0028] Figure 8 This is a schematic diagram of the optical path of an optical module provided in another embodiment of this disclosure; and

[0029] Figure 9 This is a schematic flowchart of a method for manufacturing a near-eye display device provided in an embodiment of this disclosure. Detailed Implementation

[0030] To better understand this disclosure, various aspects of this disclosure will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this disclosure and are not intended to limit the scope of this disclosure in any way.

[0031] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features, especially not any order of precedence. Therefore, without departing from the teachings of this disclosure, the first prism discussed herein may also be referred to as the second prism, and the first lens may also be referred to as the second lens, and vice versa.

[0032] The terminology used herein is for the purpose of describing particular exemplary embodiments and is not intended to be limiting. When used in this specification, the terms “comprising,” “including,” “including,” and / or “comprising” indicate the presence of the stated features, integrals, elements, components, and / or combinations thereof, but do not exclude the presence of one or more other features, integrals, elements, components, and / or combinations thereof.

[0033] This document describes the embodiments with reference to schematic diagrams of exemplary implementations. The exemplary implementations disclosed herein should not be construed as limited to the specific shapes and sizes shown, but rather include various equivalent structures capable of achieving the same function, as well as shape and size variations arising, for example, during manufacturing. The positions shown in the accompanying drawings are schematic in nature and not intended to limit the positions of the components.

[0034] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms such as those defined in common dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. Furthermore, unless explicitly limited or contradicted by the context, the specific steps included in the methods described in this disclosure are not limited to the order in which they are described, but can be performed in any order or in parallel.

[0036] Furthermore, when the term “connection” or “linkage” is used in this disclosure, it may indicate direct or indirect contact between the corresponding components, unless otherwise expressly defined or deduced from the context.

[0037] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This is a three-dimensional structural diagram of the optical module provided in the embodiments of this disclosure. Figure 2 yes Figure 1 The diagram shows the optical path of the optical module. For example, this optical module can be applied to near-eye display devices.

[0039] like Figure 1 and Figure 2 As shown, the optical module 100 includes a first prism 110, a second prism 120, a first lens 130, and a second lens 140 arranged sequentially along a first direction from the human eye side to the ambient light incident light side. The first prism 110, second prism 120, first lens 130, and second lens 140 are connected in sequence. The first prism 110 may have a surface close to the human eye side. The second prism 120 may have a surface close to the image source incident light side. The second lens 140 may have a surface close to the ambient light incident light side.

[0040] Thus, image source light rays enter the human eye from the surface of the second prism 120 near the image source light incident side and exit to the human eye from the surface of the first prism 110 near the human eye side, while ambient light rays enter the human eye from the surface of the second lens 140 near the ambient light incident side and exit to the human eye from the surface of the first prism 110 near the human eye side. The virtual scene information carried by the image source light rays and the real scene information carried by the ambient light rays are simultaneously delivered to the human eye, allowing the user to perceive both virtual and real scenes at the same time.

[0041] To ensure the optical module 100 meets the appearance requirements of a near-eye display device, the first prism 110, the second prism 120, the first lens 130, and the second lens 140 typically require irregular shaping and / or edge cutting. In some examples, individual optical elements may have rounded corners and / or chamfers between adjacent surfaces, potentially creating step surfaces between adjacent optical elements that make a smooth transition difficult. In other examples, to ensure the optical elements are aligned with each other at predetermined positions, positioning structures (e.g., ...) are provided on the mating surfaces of the optical elements. Figure 1 The positioning protrusions and / or positioning recesses shown in the rectangular dashed box make it difficult to ensure that the bonding surface of the optical element is a flat surface.

[0042] During the operation of the optical module 100, due to the presence of the stepped surface and / or positioning structure, such as Figure 2 As shown, light from the image source can easily leak from the optical module 100 to the outside, and stray light can easily be generated at the edges (e.g., at the circular dashed frame) due to reflection, thus seriously affecting the image quality and user experience of the displayed image. Furthermore, the presence of multiple stepped surfaces during the light-shielding process of the optical module 100 presents challenges to the light-shielding process, easily leading to incomplete coating and thus generating stray light, resulting in a decrease in image quality. Moreover, the irregularly distributed multiple stepped surfaces are also detrimental to mass production, thus adversely affecting production efficiency and cost control.

[0043] Therefore, this disclosure provides a schematic flowchart of a method for manufacturing an optical module. Figure 3 This is a schematic flowchart of the manufacturing method of the optical module provided in the embodiments of this disclosure.

[0044] like Figure 3 As shown, the manufacturing method 200 of the optical module may include the following steps.

[0045] S210, attach a first reflective film to the first surface of the first lens.

[0046] S220, a second reflective film is attached to the first surface of the first prism or the second surface of the second prism.

[0047] S230, the first prism, the second prism, and the first lens are cemented together, wherein the first prism, the second prism, and the first lens are arranged sequentially along a first direction, the first surface of the first prism is the surface close to the second prism in the first direction, the second surface of the second prism is the surface close to the first prism in the first direction, and the first surface of the first lens is the surface away from the second prism in the first direction.

[0048] S240, cuts the glued parts after bonding.

[0049] According to the manufacturing method 200 of the optical module provided in the disclosed embodiments, after attaching a first reflective film to the first surface of the first lens and attaching a second reflective film to the first surface of the first prism or the second surface of the second prism, the first prism, the second prism, and the first lens, which have relatively regular shapes, are first glued together to form an integral glued part. Then, the glued part is cut into a preset shape to meet the appearance requirements of different near-eye display devices. This reduces the difficulty of the glued process, improves the glued yield, and also helps to improve the flexibility of adaptation. Since there is no need to perform irregular processing and / or edge cutting on individual optical elements, the processing difficulty of individual optical elements can be reduced, and the processing yield of individual optical elements can be improved.

[0050] On the other hand, since there is no need for irregular shaping and / or edge cutting of individual optical elements, there are no chamfers and / or rounded corners between adjacent surfaces of individual optical elements, nor are there step surfaces between adjacent optical elements. The optical module has a flat shape without step surfaces, which helps to reduce the difficulty of light-shielding processing and improve efficiency. It can also prevent stray light problems caused by incomplete coating, thereby helping to improve image quality. In addition, there is no need to set positioning structures (e.g., positioning protrusions and / or positioning recesses) on the bonding surface of individual optical elements, thereby reducing the risk of image source light leakage to the outside, thus achieving the goal of improving image quality.

[0051] The following provides further examples to illustrate steps S210 to S240 above.

[0052] In step S210, a first reflective film may be attached to the first surface of the first lens. For example, the first reflective film may be bonded to the first lens through a coating process.

[0053] In some embodiments, the first lens may have a regular shape. For example, the first lens may be a rotationally symmetric structure and may have a first surface and a second surface disposed opposite to each other in the direction of the rotation axis. For example, the second surface and the second surface of the first lens may both be smooth surfaces without positioning protrusions and / or positioning grooves.

[0054] In some embodiments, the first lens may be a plano-convex lens, the first surface of the first lens may be convex, and the second surface of the first lens may be planar. For example, the first surface of the first lens may be a surface near the ambient light incident light side, and the second surface of the first lens may be a surface near the human eye side. The first lens can be used to provide positive optical power, thereby helping to improve the field of view of the manufactured optical module. The first surface of the first lens may be a spherical surface or an aspherical surface, and this disclosure does not specifically limit it in this regard.

[0055] In some embodiments, the first reflective film may have a preset splitting ratio of transmitted and reflected light. In some examples, the first reflective film may be a semi-transparent, semi-reflective film. A semi-transparent, semi-reflective film can be used to distribute the luminous flux of the incident light, for example, to make the splitting ratio of transmitted and reflected light 1. When the first reflective film is a semi-transparent, semi-reflective film, the manufactured optical module can be applied to an AR near-eye display device. In other examples, the first reflective film may be a total reflection film. The reflectivity of a total reflection film can be close to 100%. When the first reflective film is a total reflection film, the manufactured optical module can be applied to a VR near-eye display device.

[0056] In some embodiments, prior to bonding, manufacturing method 200 may further include the step of attaching a phase retardation film to a second surface of the first lens. For example, the phase retardation film may be bonded to the first lens by a coating process.

[0057] In step S220, a second reflective film may be attached to the first surface of the first prism or the second surface of the second prism. For example, the second reflective film may be bonded to the first or second prism using a coating process. As an example, the second reflective film may be a polarizing reflective film.

[0058] In some embodiments, the first prism may have a first surface and a second surface. For example, the first surface of the first prism may be a surface near the ambient light incident light side, and the second surface of the first prism may be a surface near the human eye side.

[0059] In some embodiments, the first prism may have a regular shape. Both the first and second surfaces of the first prism may be planar. For example, the first and second surfaces of the first prism may not have positioning protrusions and / or positioning recesses.

[0060] In some embodiments, the second prism may have a first surface, a second surface, and a third surface. For example, the first surface of the second prism may be a surface near the ambient light incident light side, the second surface of the second prism may be a surface near the human eye side, and the third surface of the second prism may be a surface near the image source incident light side.

[0061] In some embodiments, the second prism may have a regular shape. Both the first and second surfaces of the second prism may be planar. For example, the first and second surfaces of the second prism may not have positioning protrusions and / or positioning recesses.

[0062] In step S230, the first prism, the second prism, and the first lens can be cemented together to obtain a cemented component. Optionally, during the cementing process, the second lens can also be cemented together with the first lens, so that the cemented component also includes the second lens. For example, the second lens can be used to compensate for ambient light transmission images to improve distortion caused by ambient light.

[0063] It should be noted that the step of bonding the second lens can be omitted during the bonding process. For example, when the manufactured optical module is used in a VR near-eye display device, it does not need to receive ambient light, so there is no need to install a second lens.

[0064] The following description, with reference to the accompanying drawings, uses the example of cementing a first prism, a second prism, a first lens, and a second lens.

[0065] Figure 4 This is a schematic diagram of a three-dimensional structure after the first prism, second prism, first lens, and second lens are glued together, as provided in an embodiment of this disclosure. Figure 4 As shown, a first prism 310 with a second reflective film 370, a second prism 320, a first lens 330 with a first reflective film 350, and a second lens 340 are glued together. During the gluing process, the first prism 310, the second prism 320, the first lens 330, and the second lens 340 can be arranged sequentially along a first direction. In this way, the second lens 340 can be located on the side of the first lens 330 facing away from the second prism 320 in the first direction.

[0066] In some implementations, such as Figure 4 As shown in the detailed description above, the first prism 310 may have, for example, a first surface 311 near the ambient light incident light side and a second surface 312 near the human eye side. The second prism 320 may have, for example, a first surface 321 near the ambient light incident light side, a second surface 322 near the human eye side, and a third surface 323 near the image source incident light side. The first lens 330 may have, for example, a first surface 331 near the ambient light incident light side and a second surface 332 near the human eye side. A second reflective film 370 may be attached to the first surface 311 of the first prism 310. A first reflective film 350 may be attached to the first surface 331 of the first lens 330.

[0067] In some embodiments, the second lens 340 may have a regular shape. The second lens 340 may be rotationally symmetric and may have a first surface 341 and a second surface 342 disposed opposite to each other in the direction of the rotation axis. For example, the first surface 341 of the second lens 340 may be a surface near the ambient light incident light side, and the second surface 342 of the second lens 340 may be a surface near the human eye side. For example, the second surface 342 of the second lens 340 may be a smooth surface without positioning protrusions and / or positioning grooves.

[0068] In some embodiments, the second lens 340 may be a plano-concave lens, with the first surface 341 of the second lens 340 being planar and the second surface 342 of the second lens 340 being concave. The second surface 342 of the second lens 340 may be spherical or aspherical, and this disclosure does not impose specific limitations in this regard. For example, the second lens 340 may be used to provide negative optical power and to compensate for distortions in ambient light.

[0069] During the bonding process, for the first prism 310, second prism 320, first lens 330, and second lens 340 arranged sequentially along the first direction, the second surface 322 of the second prism 320 can be bonded to the second reflective film 370, the first surface 321 of the second prism 320 can be bonded to the second surface 332 of the first lens 330, and the second surface 342 of the second lens 340 can be bonded to the first reflective film 350. For example, the rotation axis of the first lens 330 and the rotation axis of the second lens 340 can be aligned. Furthermore, the bonding surfaces can be connected by an adhesive, thereby forming a bonded component. In the bonded component, the second surface 312 of the first prism 310 is perpendicular to the first direction, and the first surface 311 of the first prism 310 is inclined to the first direction. The second surface 322 of the second prism 320 is inclined to the first direction, and the first surface 321 of the second prism 320 is perpendicular. In other embodiments, for the first prism 310, second prism 320, first lens 330, and second lens 340 arranged sequentially along a first direction, the second surface 322 of the second prism 320 can be bonded to the second reflective film 370, and the first prism 310 and second prism 320 can be connected, for example, by an adhesive. Further, the second surface 342 of the second lens 340 can be bonded to the first reflective film 350, and the first lens 330 and second lens 340 can be connected, for example, by an adhesive. Further, the first surface 321 of the second prism 320 can be bonded to the second surface 332 of the first lens 330, and the aforementioned optical elements can be joined as a bonded component, for example, by an adhesive. In this embodiment, it helps to improve the bonding yield.

[0070] It should be noted that, before the bonding process, when the second reflective film 370 has been attached to the second surface 322 of the second prism 320, the first surface 311 of the first prism 310 can be bonded to the second reflective film 370 during the bonding process of the first prism 310 and the second prism 320.

[0071] In step S240, as Figure 4 As shown, the glued parts can be cut after bonding. For example, a CNC machine tool can be used to process the overall shape of the glued parts (e.g., cut) into a preset shape to meet the appearance requirements of the near-eye display device.

[0072] In some embodiments, during the cutting process, at least one of the following steps may be performed: at least partially removing the edge portion of the first prism 310 around the first direction; at least partially removing the edge portion of the second prism 320 around the first direction; at least partially removing the edge portion of the first lens 330 around the first direction; and at least partially removing the edge portion of the second lens 340 around the first direction. For example, with respect to the first lens 330, some of the edge portions around the rotation axis may be removed. It should be noted that the size of the removed edge portions may vary in different directions perpendicular to the first direction. For example, the above process may be referred to as an edge trimming process.

[0073] It should be noted that during the cutting process, the first reflective film 350, the phase retardation film (not shown), and a portion of the second reflective film 370 are removed along with the removed edge portion.

[0074] Figure 5 This is a schematic diagram of the three-dimensional structure of the glued part after cutting, provided in an embodiment of this disclosure. Figure 6 This is a three-dimensional structural diagram of a cut and glued component provided in another embodiment of this disclosure. (See diagram below.) Figure 5 and Figure 6 As shown, in order to meet the appearance requirements of near-eye display devices, the cut and glued parts (e.g., optical module 300) can have different shapes. The outer surfaces of the first prism 310, the second prism 320, the first lens 330, and the second lens 340 in the optical module 300 are smooth and flat without step surfaces.

[0075] In some embodiments, after cutting, the manufacturing method 200 may further include applying a light-shielding treatment to surfaces of the bonded component other than the opposing surfaces in the first direction (e.g., the second surface 312 of the first prism 310 and the first surface 341 of the second lens 340) and the non-bonded surfaces of the second prism 320 (e.g., the third surface 323 of the second prism 320). For example, the light-shielding treatment may include blackening the other surfaces or covering them with a black film. For instance, it may be possible to... Figure 5 or Figure 6 The optical module 300 shown includes other surfaces containing black dots that are coated with black paint, or a black film is applied to these other surfaces. Because the outer surface of the optical module 300 is smooth and flat without any steps, it effectively reduces the difficulty of light-shielding processing and improves efficiency. It also prevents stray light problems caused by missed coating, thereby helping to improve image quality.

[0076] It should be noted that, in the case that the glued part does not include the second lens, the other surfaces may be any surfaces in the glued part other than the second surface 312 of the first prism 310, the first surface 331 of the first lens 330, and the third surface 323 of the second prism 320.

[0077] The working principle of the optical module 300 will be briefly explained below with reference to the accompanying drawings.

[0078] Figure 7 This is a schematic diagram of the optical path of an optical module provided in an embodiment of this disclosure. It should be noted that in this embodiment, the second surface 332 of the first lens 330 is not attached with a phase retardation film. For example, the first reflective film 350 may be a semi-transparent, semi-reflective film.

[0079] like Figure 7 As shown, during the operation of the optical module 300, on one hand, light ray A emitted from the image source 380 enters through the third surface 323 of the second prism 320 and reaches the first surface 321 of the second prism 320. It is reflected at the first surface 321 to the second surface 322 of the second prism 320. It is then reflected again at the second reflective film 322 to propagate towards the first surface 331 of the first lens 330. Light ray A is reflected at the first reflective film 350 to propagate towards the human eye until it reaches the eye. On the other hand, light ray B from ambient light enters through the first surface 341 of the second lens 340 and passes sequentially through the first lens 330, the second prism 320, and the first prism 310 to reach the human eye. Thus, the virtual scene information carried by light ray A from the image source 380 and the real scene information carried by light ray B from the external environment can be simultaneously delivered to the human eye, allowing the user to perceive both virtual and real scenes simultaneously.

[0080] Figure 8 This is a schematic diagram of the optical path of an optical module provided in another embodiment of this disclosure. It should be noted that in this embodiment, a phase retardation film 360 may be attached to the second surface 332 of the first lens 330. For example, the first reflective film 350 may be a semi-transparent, semi-reflective film. The second reflective film 370 may be a polarizing reflective film.

[0081] like Figure 8As shown, during the operation of the optical module 300, light ray A emitted from the image source 380 enters through the third surface 323 of the second prism 320 and, after reflection from the first surface 321 of the second prism 320, reaches the second surface 322 of the second prism 320. The second reflective film 370 partially reflects light ray A, and the light ray A reflected by the second reflective film 370 can be polarized. Polarized light ray A can exit from the first surface 321 of the second prism 320 and, after passing through the phase retardation film 360 and the first lens 33, reach the first reflective film 350. Polarized light ray A is reflected at the first reflective film 350, which is implemented as a semi-transparent and semi-reflective film, and then passes through the phase retardation film 360 again to propagate towards the human eye until it reaches the human eye. Because polarized light ray A passes through the phase retardation film 360 twice, the polarization direction of polarized light ray A can change. When polarized light ray A passes through the phase retardation film 360 and reaches the second reflective film 370, which is implemented as a polarizing reflective film, polarized light ray A can be transmitted through the second reflective film 370 to reach the human eye. On the other hand, light ray B from ambient light is incident from the first surface 341 of the second lens 340 and passes sequentially through the first lens 330, the second prism 320, and the first prism 310 to reach the human eye. In this way, the virtual scene information carried by light ray A from the image source 380 and the real scene information carried by light ray B from the external environment can be simultaneously delivered to the human eye, thereby enabling the user to perceive both virtual and real scenes at the same time. By using the phase retardation film and the polarizing reflective film in combination, it helps to reduce the loss of light from the image source 380 during propagation, thereby helping to improve the utilization rate of light from the image source 380.

[0082] This disclosure provides a method for manufacturing an optical module, including some embodiments. Figure 9 This is a schematic flowchart of a method for manufacturing a near-eye display device according to an embodiment of this disclosure. Figure 9 As shown, the manufacturing method 400 of the near-eye display device may include the following steps S410 and S420.

[0083] S410 forms an optical module.

[0084] S420 sets the image source in a direction perpendicular to the non-glued surface of the second prism in the optical module.

[0085] In step S410, the optical module can be formed according to the manufacturing method 200 described in detail above.

[0086] In some implementations, the image source in step S420 can be used to provide and emit light carrying information about virtual objects. For example, the image source can be at least one of a projection display, an LCD display, an LED display, an OLED display, or a Micro / MiniLED display.

[0087] The manufacturing method 400 for a near-eye display device provided in this disclosure reduces manufacturing difficulty, improves manufacturing efficiency, and also helps to improve imaging quality.

[0088] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

Claims

1. A method for manufacturing an optical module, comprising: A first reflective film is attached to the first surface of the first lens; A second reflective film is attached to the first surface of the first prism or the second surface of the second prism; The first prism, the second prism, and the first lens are glued together, wherein the first prism, the second prism, and the first lens are arranged sequentially along a first direction, the first surface of the first prism is the surface close to the second prism in the first direction, the second surface of the second prism is the surface close to the first prism in the first direction, and the first surface of the first lens is the surface away from the second prism in the first direction. as well as Cut the glued parts after they have been glued together.

2. The manufacturing method according to claim 1, wherein, The second reflective film includes a polarizing reflective film. Before bonding the first prism, the second prism, and the first lens together, the manufacturing method further includes: A phase retardation film is attached to the second surface of the first lens, wherein the first surface and the second surface of the first lens are opposite to each other in the first direction.

3. The manufacturing method according to claim 1, further comprising bonding the first prism, the second prism, and the first lens together: The second lens and the first lens are cemented together, wherein the second lens is located on the side of the first lens that is opposite to the second prism in the first direction.

4. The manufacturing method according to claim 1 or 3, further comprising: The surfaces of the glued component, except for the opposing surfaces in the first direction and the non-glued surfaces of the second prism, are subjected to light-shielding treatment.

5. The manufacturing method according to claim 4, wherein, The light-shielding treatment includes: The other surfaces are coated with black or covered with a black film.

6. The manufacturing method according to claim 1, wherein, Cutting the glued parts after bonding includes: The overall shape of the glued part is machined.

7. The manufacturing method according to claim 1 or 6, wherein, Cutting the glued parts after bonding includes performing at least one of the following steps: At least partially remove the edge portion of the first prism surrounding the first direction; At least partially remove the edge portion of the second prism surrounding the first direction; as well as At least partially remove the edge portion of the first lens surrounding the first direction.

8. The manufacturing method according to any one of claims 1 to 3, wherein, The first surface of the first lens is convex, and the surface of the first lens near the second prism in the first direction is flat.

9. The manufacturing method according to claim 3, wherein, The surface of the second lens that is away from the first lens in the first direction is a plane, and the surface of the second lens that is close to the first lens in the first direction is a concave surface.

10. A method for manufacturing a near-eye display device, comprising: The optical module is formed according to the manufacturing method of any one of claims 1 to 9; as well as The image source is positioned in a direction perpendicular to the unbonded surface of the second prism in the optical module.

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