Optical assembly and near-eye display device

Abstract

The utility model provides an optical assembly and a near-to-eye display device, the optical assembly is arranged between an optical machine and a waveguide assembly, the optical assembly comprises a polarization reflection part, the polarization reflection part is obliquely arranged on an emergent light path of the optical machine, and the polarization reflection part is configured to transmit first polarized light and reflect second polarized light, the first polarized light and the second polarized light have different polarization directions; the quarter-wave plate is arranged on one side of the polarization reflector, and the quarter-wave plate is configured to convert the first polarized light into circularly polarized light and convert the circularly polarized light into second polarized light; and the reflector is arranged on one side, far away from the polarization reflector, of the quarter-wave plate. When the optical assembly is applied to the near-to-eye display equipment, the optical machine is prevented from being arranged perpendicular to the waveguide assembly, so that the lengths of convex hulls on the two sides of the near-to-eye display equipment are reduced, and the wearing comfort of a user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to near eye display technical field especially, relate to an optical assembly and near eye display device. BACKGROUND

[0002] In recent years, as the ideal terminal platform of the fusion application of "augmented reality (AR) + artificial intelligence (AI)", the near eye display device has received extensive attention and in-depth research in the industry. The core component of such a device, the optical display module, is mainly composed of two parts: a micro projection light machine and an optical coupler. Among the many optical coupler solutions, optical waveguide technology is considered the mainstream optical coupling solution in the future due to its outstanding thinness, high transparency, and flexible industrial design adaptability.

[0003] Currently, the implementation scheme of the optical waveguide for binocular display function mainly falls into two categories: one is to use a single light machine with a one-to-two optical waveguide design, and the other is to use a left and right independent light machine with corresponding left and right optical waveguides. The latter can achieve independent display of both eyes (i.e., binocular hetero-display) by providing an independent light machine for each eye.

[0004] However, the length of the light machine is usually relatively long at present, and the light machine arranged on both sides of the near eye display device will form a convexity in appearance, which may interfere with the user's brow bone, seriously affecting the user's wearing comfort and experience. SUMMARY

[0005] The present application provides an optical assembly and a near eye display device. When the optical assembly is applied in the near eye display device, the light machine is not arranged vertically to the waveguide assembly, thereby reducing the length of the convexity on both sides of the near eye display device and improving the user's wearing comfort.

[0006] The present application provides an optical assembly arranged between the light machine and the waveguide assembly, which comprises:

[0007] A polarization reflection element is arranged obliquely on the light path of the light machine. The polarization reflection element is configured to transmit first polarized light and reflect second polarized light, and the polarization directions of the first polarized light and the second polarized light are different.

[0008] A quarter-wave plate is arranged on one side of the polarization reflection element. The quarter-wave plate is configured to convert the first polarized light into circularly polarized light and convert the circularly polarized light into the second polarized light.

[0009] A mirror is arranged on the side of the quarter-wave plate away from the polarization reflection element.

[0010] In some embodiments, the optical assembly further comprises a first lens group, which is arranged on a side of the polarization reflector away from the quarter-wave plate.

[0011] In some embodiments, the optical assembly further comprises a first protective mirror arranged on a side of the polarization reflector close to the waveguide assembly, and a second protective mirror arranged on a side of the polarization reflector away from the waveguide assembly, the first protective mirror, the reflector, the second protective mirror and the polarization reflector are sequentially connected to form an accommodation space, and the polarization reflector and the quarter-wave plate are arranged in the accommodation space.

[0012] In some embodiments, the first protective mirror is a plane mirror or a lens.

[0013] In some embodiments, the reflector is a first prism, and a side of the first prism away from the quarter-wave plate is a reflective surface.

[0014] In some embodiments, the optical assembly further comprises a second prism arranged on a side of the polarization reflector and the quarter-wave plate away from the first prism, and the second prism and the first prism sandwich the polarization reflector and the quarter-wave plate.

[0015] Embodiments of the present application also provide a near-eye display device, comprising:

[0016] An optical engine;

[0017] An optical assembly arranged on an out-lighting side of the optical engine, the optical assembly being the above-described optical assembly;

[0018] A waveguide assembly arranged on an out-lighting side of the optical assembly.

[0019] In some embodiments, the near-eye display device further comprises a first polarization layer arranged on an out-lighting side of the optical engine.

[0020] In some embodiments, the optical engine comprises a plurality of display screens and a color separation prism, the color separation prism is provided with a plurality of in-lighting surfaces and an out-lighting surface, and a plurality of the display screens correspond to a plurality of the in-lighting surfaces one by one; and the optical assembly is arranged on the out-lighting surface.

[0021] In some embodiments, the near-eye display device further comprises a plurality of second polarization layers, a plurality of the second polarization layers correspond to a plurality of the display screens one by one, and the second polarization layers are arranged on an out-lighting side of the display screens.

[0022] The optical assembly and the near-eye display device provided by the embodiments of the present application are arranged between a waveguide assembly and an optical engine. The optical assembly comprises a polarization reflection element, a quarter-wave plate and a mirror. First polarized light emitted by the optical engine first passes through the polarization reflection element and the quarter-wave plate in sequence. In this process, the quarter-wave plate converts the first polarized light into circularly polarized light. The circularly polarized light continues to propagate to the mirror. When the circularly polarized light is reflected by the mirror to the quarter-wave plate, the circularly polarized light is converted into second polarized light. The second polarized light is reflected by the polarization reflection element into the waveguide assembly. As can be seen, through the synergistic effect of the polarization reflection element, the quarter-wave plate and the mirror, not only is the light path folded, but also the propagation direction of the light is adjusted. This makes it unnecessary to install the optical engine assembly perpendicularly to the waveguide assembly, thereby significantly reducing the volume of the protrusions on both sides of the near-eye display device and greatly improving the comfort experience of the user when wearing. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 A structural schematic diagram of a near-eye display device in the prior art.

[0025] Figure 2 A first structural schematic diagram of the optical assembly, the optical engine and the waveguide assembly provided by the embodiments of the present application.

[0026] Figure 3 A first structural schematic diagram of the optical assembly provided by the embodiments of the present application.

[0027] Figure 4 A second structural schematic diagram of the optical assembly provided by the embodiments of the present application.

[0028] Figure 5 A second structural schematic diagram of the optical assembly, the optical engine and the waveguide assembly provided by the embodiments of the present application.

[0029] Figure 6 A third structural schematic diagram of the optical assembly provided by the embodiments of the present application.

[0030] Figure 7 An MTF diagram of the optical assembly provided by the embodiments of the present application.

[0031] Figure 8 A first structural schematic diagram of the near-eye display device provided by the embodiments of the present application.

[0032] Figure 9 A second structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0033] Figure 10 A structural schematic diagram of a waveguide assembly provided by an embodiment of the present application.

[0034] Figure 11 A structural schematic diagram of an optical engine provided by an embodiment of the present application.

[0035] Figure 12 A third structural schematic diagram of a near-eye display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a near-eye display device in the prior art.

[0038] In the technical field of the prior art near-eye display device 300 (such as augmented reality (AR) or virtual reality (VR) glasses), the layout and size of the optical engine 301 often pose challenges to the wearing comfort of the user. In particular, when the optical engine 301 is configured in the temple portion of the glasses, its relatively long length tends to form a convex structure, which may cause brow bone compression to the user, thereby reducing the wearing comfort.

[0039] To solve the above problems, the present application provides an optical assembly and a near-eye display device. When the optical assembly is applied to the near-eye display device, the optical engine is not arranged vertically to the waveguide assembly, so as to reduce the length of the convex structure on both sides of the near-eye display device, and improve the wearing comfort of the user. The following will be described with reference to the drawings.

[0040] Please refer to Figure 2 , Figure 2 A first structural schematic diagram of an optical assembly, an optical engine and a waveguide assembly provided by an embodiment of the present application. The present application provides an optical assembly 10, which is arranged between the optical engine 20 and the waveguide assembly 30, and is designed to achieve accurate regulation and efficient transmission of light. Through the optical assembly 10 of the present application, the position layout of the optical engine 20 is optimized, and the occupied space of the optical engine 20 on the temple is significantly reduced, thereby avoiding the compression of the convex structure to the user's brow bone and improving the wearing comfort of the user.

[0041] The optical assembly 10 comprises a polarization reflector 101, a quarter-wave plate 102 and a mirror 103.

[0042] The polarization reflector 101 is obliquely arranged on the light path of the light engine 20, and can selectively transmit light of a first polarization direction (first polarized light) and reflect light of a second polarization direction (second polarized light). Here, the first polarized light and the second polarized light are both linearly polarized light, and their polarization directions are orthogonal to each other.

[0043] The included angle between the polarization reflector 101 and the light path of the light engine 20 can be 45°. When the light is emitted from the light engine 20 and is incident on the polarization reflector 101 at an angle of 45°, whether the light is transmitted or reflected, it will exit the polarization reflector 101 at the same angle, thereby avoiding excessive deflection of the light and unnecessary energy loss. Correspondingly, the included angle between the waveguide assembly 30 and the polarization reflector 101 is also 45°. This design enables the waveguide assembly 30 to efficiently receive the light reflected or transmitted by the polarization reflector 101 and guide it to the predetermined display area. Since the direction of the light engine 20 towards the polarization reflector 101 is approximately perpendicular to the direction of the polarization reflector 101 towards the waveguide assembly 30, the volume of the entire optical assembly 10 is effectively controlled.

[0044] The quarter-wave plate 102 is arranged on one side of the polarization reflector 101. The quarter-wave plate 102 is configured to convert the first polarized light into circularly polarized light and convert the circularly polarized light into the second polarized light, that is, when the first polarized light passes through the quarter-wave plate 102 twice in succession, its polarization state is flipped, and the first polarized light is converted into the second polarized light.

[0045] The mirror 103 is arranged on the side of the quarter-wave plate 102 away from the polarization reflector 101. The main function of the mirror 103 is to reflect the circularly polarized light (before being converted into the second polarized light) converted by the quarter-wave plate 102 back to the quarter-wave plate 102 to complete the conversion of the polarization state again.

[0046] The optical path of the optical assembly 10 provided in the present application can be as follows: the first polarized light emitted by the light engine 20 first passes through the polarization reflector 101 and the quarter-wave plate 102 in succession. In this process, the quarter-wave plate 102 converts the first polarized light into circularly polarized light. The circularly polarized light continues to propagate to the mirror 103, is reflected by the mirror 103, and when the circularly polarized light passes through the quarter-wave plate 102 again, it is converted into the second polarized light. The second polarized light is reflected by the polarization reflector 101 into the waveguide assembly 30, enters the human eye via the waveguide assembly 30, and finally forms an enlarged virtual image.

[0047] It can be seen that, through the synergistic effect of the polarizing reflector 101, the quarter-wave plate 102, and the mirror 103, not only is the light path folded, but also the direction of light propagation is adjusted, which makes it unnecessary for the optical engine 20 assembly to be installed perpendicular to the waveguide assembly 30, thereby significantly reducing the volume of the protrusions on both sides of the near-eye display device 100 and greatly improving the comfort experience of the user when wearing.

[0048] The optical assembly 10 also includes a transparent substrate 104, which is stacked with the polarizing reflector and the quarter-wave plate 102. The transparent substrate 104 can support the polarizing reflector and the quarter-wave plate 102. This design not only enhances the structural stability of the optical assembly 10, but also ensures efficient management and precise control of light during transmission. The transparent substrate 104 serves as the basic support layer of the optical assembly 10, and its main function is to provide a stable and flat support surface for the polarizing reflector and the quarter-wave plate 102. This design ensures that the layers can be closely attached to each other, avoiding light loss or polarization state changes caused by interlayer gaps or misalignment.

[0049] Please refer to Figure 3 , Figure 3 The first structure diagram of the optical assembly provided by the embodiment of the present application. The optical assembly 10 also includes a first lens group 105, which is arranged on the side of the polarizing reflector 101 away from the quarter-wave plate 102. The first lens group 105 can adjust the light emitted by the optical engine 20, aiming to further regulate the propagation path and focusing characteristics of the light, thereby improving the overall performance and imaging quality of the optical assembly 10.

[0050] The first lens group 105 includes one or more lenses. When the number of lenses is multiple, the multiple lenses can work cooperatively to form a first image plane. The first image plane is further regulated and imaged by the subsequent polarizing reflector 101, quarter-wave plate 102, and mirror 103, achieving the effect of secondary imaging. This design not only improves the imaging quality of the optical assembly 10, but also significantly increases the field of view of the near-eye display device 100, providing users with a wider and more immersive visual experience.

[0051] Please refer to Figure 4 , Figure 4 The second structure diagram of the optical assembly provided by the embodiment of the present application. The optical assembly 10 also includes a second lens group 106, which can be arranged between the quarter-wave plate 102 and the mirror 103. Similarly, the second lens group 106 can further adjust the light transmitted between the quarter-wave plate 102 and the mirror 103 to optimize the propagation path of the light, improve the utilization rate of the light, and enhance the parallelism of the light.

[0052] Please continue to refer to Figure 3 and Figure 4 In some cases, the mirror 103 has a reflecting surface 1031 which is concave towards the quarter-wave plate 102 and away from the quarter-wave plate 102. The reflecting surface 1031 is designed to precisely adjust the propagation path of the light, ensuring that the light reflected by the reflecting surface 1031 can maximally re-enter the quarter-wave plate 102, thereby significantly improving the utilization of light and the overall performance of the system. The specific form of the reflecting surface 1031 can be selected as a spherical surface or a non-spherical surface according to actual needs, so as to further optimize the reflection effect of light and the imaging quality of the optical assembly 10.

[0053] In addition, please continue to refer to Figures 2 to 4 The optical assembly 10 further comprises a first protective mirror 107 and a second protective mirror 108, the first protective mirror 107 is arranged on the side of the polarization reflection element 101 close to the waveguide assembly 30, and the second protective mirror 108 is arranged on the side of the polarization reflection element 101 away from the waveguide assembly 30. The first protective mirror 107, the mirror 103, the second protective mirror 108 and the polarization reflection element 101 jointly constitute a closed or semi-closed containing space, which provides effective protection for the internal optical elements (including the polarization reflection element 101 and the quarter-wave plate 102) and prevents them from being disturbed or damaged by the external environment.

[0054] The first protective mirror 107 is a plane mirror or a lens. When the first protective mirror 107 exists in the form of a plane mirror, its main function is to effectively block external light, dust or impurities from entering the inside of the optical assembly 10, thereby maintaining the cleanliness and stability of the system. When the first protective mirror 107 is designed as a lens, it not only has the advantages of a plane mirror, but also can further regulate and optimize the light entering the optical assembly 10, such as focusing, correcting chromatic aberration, etc., thereby further improving the imaging quality and visual experience of the optical assembly 10.

[0055] In other cases, please refer to Figure 5 and Figure 6 , Figure 5 The second structure diagram of the optical assembly, the optical machine and the waveguide assembly provided by the embodiment of the present application, Figure 6 The third structure diagram of the optical assembly provided by the embodiment of the present application. The mirror 103 can be a first prism 109, and the side of the first prism 109 away from the quarter-wave plate 102 is a reflecting surface. This reflecting surface can accurately reflect the circularly polarized light converted by the quarter-wave plate 102 back to the quarter-wave plate 102, thereby successfully completing the re-conversion of the polarization state. This design not only simplifies the structure of the optical system, but also further improves the utilization of light and the overall performance of the system.

[0056] The first prism 109 has a first prism face, a second prism face, and a third prism face. The quarter-wave plate 102 is arranged on the first prism face, and the polarized reflector 101 is further arranged on the quarter-wave plate 102. This arrangement not only provides stable support for the quarter-wave plate 102 and the polarized reflector 101, but also ensures the effective transmission of light in the optical assembly 10. The second prism face is the side of the first prism 109 away from the light engine 20, and its design is crucial for the reflection and regulation of light. The third prism face is close to the waveguide assembly 30 and is the light exit face of the first prism 109.

[0057] In the design of the second prism face, the embodiments of the present application provide the following two optional schemes.

[0058] The first scheme is that the second prism face is a convex face. The second prism face is concave towards the direction away from the quarter-wave plate 102. The second prism face can accurately adjust the propagation path of light, ensuring that the light reflected by the second prism face can enter the quarter-wave plate 102 again to the maximum extent, thereby further improving the utilization rate of light. The specific form of the convex face can be selected as a spherical face or a non-spherical face according to actual needs to optimize the reflection effect of light and the imaging quality of the system.

[0059] The second scheme is that the second prism face is a plane. The reflector 103 further includes a convex lens arranged on the second prism face. The convex lens has two opposite faces, a plane and a convex face. The plane closely abuts the second prism face of the first prism 109, and the convex face protrudes away from the light engine 20. This design not only enhances the regulation ability of the second prism face for light, but also makes the structure of the optical assembly 10 more compact and stable. The convex lens can be connected with the first prism 109 by gluing or one-piece forming to ensure its stability and durability.

[0060] Please continue to refer to Figure 5 and Figure 6 The optical assembly 10 further includes a second prism 110 arranged on the side of the polarized reflector 101 and the quarter-wave plate 102 away from the first prism 109. The second prism 110 and the first prism 109 sandwich the polarized reflector 101 and the quarter-wave plate 102, which can effectively enhance the structural stability of the optical assembly 10. The second prism 110 has a fourth prism face, a fifth prism face, and a sixth prism face. The fourth prism face is arranged opposite to the first prism face, and the quarter-wave plate 102 and the polarized reflector 101 are arranged between the fourth prism face and the first prism face. The fifth prism face is the side of the second prism 110 close to the light engine 20, and the sixth prism face is the side of the second prism 110 away from the waveguide assembly 30, which ensures the effective transmission and regulation of light in the optical assembly 10.

[0061] With the above, the embodiments of the present application introduce the innovative design of the first prism 109 and the second prism 110, etc., which not only simplifies the structure of the optical system, but also significantly improves the utilization rate of light and the overall performance of the system. At the same time, through the careful design of the reflecting surface, convex lens and other elements, the structural stability and imaging quality of the optical assembly 10 are further enhanced. These designs together constitute the core advantages of the optical assembly 10 of the embodiments of the present application, providing new ideas and solutions for the design and application of the near-eye display device 100.

[0062] In the above embodiment, please continue to refer to, the thickness L1 of the optical assembly 10 is only 3mm to 4mm. Please continue to refer to Figure 1 However, in the prior art, whether it is a traditional single-screen light machine 301 or a traditional color light machine 301, the thickness L2 is at least 5mm and at most 10mm, which undoubtedly increases the length of the convex hull formed by the near-eye display device 100 in the direction of the glasses leg. When these devices are worn by the user, the excessively long convex hull may interfere with the user's brow bone, resulting in discomfort or pain when worn. The optical assembly 10 in the present application has a small thickness, so the length of the convex hull formed in the direction of the glasses leg is also correspondingly shortened. This design enables the near-eye display device 100 to fit the user's facial profile more closely when worn, reducing contact and interference with parts such as the brow bone, thereby significantly improving the user's wearing comfort. Even after a long period of wear, the user can still experience comfort and no sensation, which is crucial for improving the user's overall satisfaction and use experience.

[0063] Please refer to Figure 7 , Figure 7 The MTF graph of the optical assembly provided by the embodiments of the present application. From Figure 5 It can be seen that the MTF (Modulation Transfer Function) graph of the optical assembly 10 can represent that the average MTF of the field of view of the optical assembly 10 at 100lp / mm is >0.9. It can be seen that the field of view formed by the first lens group 105 and the second lens group 106 having multiple lenses is significantly increased compared to the optical assembly 10 in the prior art, the field of view angle of the optical assembly 10 is 20° to 60°, and the distortion of the image displayed by the optical assembly 10 is <1%.

[0064] Please refer to Figure 8 and Figure 9 , Figure 8 The first structure schematic diagram of the near-eye display device provided by the embodiments of the present application, Figure 9A second structural schematic diagram of a near-eye display device provided by an embodiment of the present application. The embodiment of the present application also provides a near-eye display device 100, which comprises an optical engine 20, an optical assembly 10, and a waveguide assembly 30. The optical assembly 10 is arranged on the light-emitting side of the optical engine 20, and the optical assembly 10 is the optical assembly 10 in the above embodiment. The waveguide assembly 30 is arranged on the light-emitting side of the optical assembly 10.

[0065] The near-eye display device 100 is a device configured to present display content directly in front of the eyes of a user within a certain distance (generally 2-5 cm), such as a head-mounted display in a virtual reality (VR) device, optical see-through glasses in an augmented reality (AR) device, and the like. The near-eye display device 100 includes, but is not limited to, a head-mounted device such as AR glasses, an AR helmet, and the like, which has a wide range of applications and is flexible.

[0066] Please refer to Figure 10 , Figure 10 A structural schematic diagram of a waveguide assembly provided by an embodiment of the present application. The waveguide assembly 30 comprises a waveguide substrate 31, an in-coupling grating 32, and an out-coupling grating 33. The in-coupling grating 32 and the out-coupling grating 33 are arranged on the waveguide substrate 31, and the three components work together to achieve perfect fusion of virtual images and the real world in AR glasses. The waveguide substrate 31 is usually made of materials with high light transmittance and low loss, such as special glass or high-performance plastic, to ensure the efficiency and stability of light transmission. The in-coupling grating 32 can receive light from the optical assembly 10, and through a specific diffraction effect, guide the light into the waveguide substrate 31 at a specific angle and distribution, ensuring that the light propagates forward in the substrate in a total reflection manner. The out-coupling grating 33 is responsible for coupling the light transmitted in the waveguide substrate 31 in a specific manner and projecting it into the user's eyes.

[0067] The waveguide assembly 30 also comprises a turning grating 34 located between the in-coupling grating 32 and the out-coupling grating 33. The design is intended to change the propagation direction of light so that the light can propagate in a more flexible and efficient manner inside the waveguide substrate 31. This design not only improves the utilization efficiency of light, but also makes the waveguide assembly 30 more compact and lightweight, meeting the needs of modern AR glasses for miniaturization and lightness.

[0068] The light engine 20 is responsible for emitting light and forming images. The light engine 20 in this embodiment can include various types such as Micro LED display screen, Micro OLED display screen, Laser Beam Scanning display screen (LBS display screen), Digital Mirror Device display screen (DMD display screen), etc. These advanced display screen technologies ensure high resolution and color accuracy of virtual images, providing users with a more realistic and vivid visual experience. The light engine 20 is also known as micro projection light engine 20, micro display screen, light engine, etc. These terms can be used interchangeably in this application unless otherwise specified.

[0069] In terms of design for the light engine 20 and its emitted light, the present application provides the following two optional schemes to optimize the performance of the near-eye display device 100 and improve user experience.

[0070] The first scheme is: please continue to refer to Figure 8 When the number of the first light engine 20 is single, in order to match the requirement of the optical assembly 10 for light with specific polarization direction, the near-eye display device 100 further includes a first polarization layer 40, which is arranged on the light-emitting side of the light engine 20. The main function of the first polarization layer 40 is to convert the natural light emitted by the light engine 20 into polarized light with specific polarization direction (such as first polarized light). This design ensures that the light has the correct polarization state before entering the optical assembly 10, thereby improving the utilization of light and the overall performance of the system.

[0071] The second scheme is: please continue to refer to Figure 9 and Figure 11 , Figure 11 The structure diagram of the light engine provided by the present application is shown in the figure. The light engine 20 includes a plurality of display screens 21 and a dichroic prism 22. The dichroic prism 22 is provided with a plurality of light-in surfaces and a light-out surface, and the plurality of display screens 21 correspond one-to-one to the plurality of light-in surfaces. The optical assembly 10 is arranged on the light-out surface. The number of display screens 21 can be configured according to actual requirements, for example, three display screens 21 are used to display red, green and blue light respectively. Correspondingly, the number of light-in surfaces of the dichroic prism 22 is also set to three to receive light from the three display screens 21. The function of the dichroic prism 22 is to synthesize these different colored lights and emit them uniformly from the light-out surface, providing high-quality colored light for the subsequent optical assembly 10.

[0072] In addition, in order to further improve the polarization quality of the light, in the second scheme, the near-eye display device 100 further comprises a plurality of second polarization layers 50, which correspond to the plurality of display screens one by one. The second polarization layer 50 is arranged on the light-emitting side of the display screen, and can convert the light emitted by the display screen into polarized light with a specific polarization direction (such as first polarized light). This design ensures that the light has the correct polarization state before entering the dichroic prism 22, thereby further improving the synthesis effect of the light and the color performance of the system.

[0073] In addition, please refer to Figure 12 , Figure 12 The third structure schematic diagram of the near-eye display device provided by the embodiment of the present application is shown. The near-eye display device 100 is also equipped with a processor, a fixing member 60 and other key components. The processor is responsible for accepting instructions, data processing and controlling other components, ensuring smooth overall operation of the device. The fixing member 60 includes a glasses leg 61 and a glasses frame 62, which are used to install, fix or carry the above-mentioned optical components 10, ensuring the stability and comfort of the entire device, and facilitating the user to wear for a long time.

[0074] The near-eye display device 100 can also include sensors, circuits, output devices, and batteries or solar cells and other components. The sensor can monitor the user's head movement or eye movement in real time, so as to adjust the position and angle of the virtual image, further improving the user experience. The circuit is responsible for connecting various components to realize the transmission and processing of information. The output device is used to show the virtual image or issue sound prompts to the user. The battery or solar cell provides continuous power support for the device, ensuring long-term operation of the device.

[0075] In addition, the near-eye display device 100 can also adopt a surround type lens, an adaptive glasses or an auxiliary frame design to adapt to the wearing needs of different users. At the same time, the device can also be equipped with a belt for fixing, ensuring that the user can maintain stability and comfort during use.

[0076] The optical assembly 10 and the near-eye display device 100 provided by the embodiments of the present application, the optical assembly 10 is arranged between the waveguide assembly 30 and the light machine 20, the optical assembly 10 comprises a polarization reflection element 101, a quarter-wave plate 102 and a mirror 103. The first polarized light emitted by the light machine 20 first passes through the polarization reflection element 101 and the quarter-wave plate 102 in turn, in the process, the quarter-wave plate 102 converts the first polarized light into circularly polarized light, the circularly polarized light continues to propagate to the mirror 103, and when the circularly polarized light is reflected by the mirror 103, the circularly polarized light is converted into the second polarized light, and the second polarized light is reflected by the polarization reflection element 101 into the waveguide assembly 30. As can be seen, through the synergistic effect of the polarization reflection element 101, the quarter-wave plate 102 and the mirror 103, not only the folding of the optical path is realized, but also the propagation direction of the light is adjusted, which makes the light machine 20 component not have to be installed perpendicular to the waveguide assembly 30, thereby significantly reducing the volume of the protrusions on both sides of the near-eye display device 100, and greatly improving the comfort experience of the user when wearing.

[0077] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0078] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0079] The optical assembly and the near-eye display device provided by the embodiments of the present application are introduced in detail. The principles and implementation modes of the present application are described by applying specific examples, and the above description of the embodiments is only for the purpose of helping to understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the present application should not be understood as the limitation of the present application.

Claims

1. An optical assembly, comprising: An optical assembly is arranged between the light engine and the waveguide assembly, the optical assembly comprising: a polarization reflection element arranged obliquely in a light path of the light engine, the polarization reflection element being configured to transmit first polarized light and reflect second polarized light, the first polarized light and the second polarized light having different polarization directions; a quarter-wave plate arranged on one side of the polarization reflection element, the quarter-wave plate being configured to convert the first polarized light into circularly polarized light and convert the circularly polarized light into the second polarized light; a mirror arranged on a side of the quarter-wave plate away from the polarization reflection element.

2. The optical assembly of claim 1, wherein, The optical assembly further comprises a first lens group arranged on a side of the polarization reflection element away from the quarter-wave plate.

3. The optical assembly of claim 2, wherein, The optical assembly further comprises a first protective mirror arranged on a side of the polarization reflection element close to the waveguide assembly and a second protective mirror arranged on a side of the polarization reflection element away from the waveguide assembly, the first protective mirror, the mirror, the second protective mirror, and the polarization reflection element being sequentially connected to form an accommodation space, the polarization reflection element and the quarter-wave plate being arranged in the accommodation space.

4. The optical assembly of claim 3, wherein, The first protective mirror is a plane mirror or a lens.

5. The optical assembly of claim 1 or 2, wherein, The mirror is a first prism, a side of the first prism away from the quarter-wave plate being a reflective surface.

6. The optical assembly of claim 5, wherein, The optical assembly further comprises a second prism arranged on a side of the polarization reflection element and the quarter-wave plate away from the first prism, the second prism and the first prism sandwiching the polarization reflection element and the quarter-wave plate.

7. A near-eye display device, comprising: The optical assembly comprises: a light engine; an optical assembly arranged on a light exit side of the light engine, the optical assembly being any one of the optical assemblies according to claims 1 to 6; a waveguide assembly arranged on a light exit side of the optical assembly.

8. The near-eye display device of claim 7, wherein, The optical assembly further comprises a first polarization layer arranged on the light exit side of the light engine.

9. The near-eye display device of claim 7, wherein, The light engine comprises a plurality of display screens and a color separation prism, the color separation prism being provided with a plurality of light entrance surfaces and one light exit surface, the plurality of display screens and the plurality of light entrance surfaces corresponding one-to-one, and the optical assembly being arranged on the light exit surface.

10. The near-eye display device of claim 9, wherein, The optical assembly further comprises a plurality of second polarization layers, the plurality of second polarization layers corresponding one-to-one to the plurality of display screens, and the second polarization layers being arranged on light exit sides of the display screens.

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