Optical assembly and near-eye display device

Abstract

The invention provides an optical assembly and a near-to-eye display device, and the optical assembly comprises a beam splitter prism which is provided with a first light-emitting surface and a second light-emitting surface; the first folding light path assembly corresponds to the first light emitting surface of the beam splitter prism, and the second folding light path assembly corresponds to the second light emitting surface of the beam splitter prism. The optical assembly is matched with a single light engine to realize a binocular display effect, so that the cost and the weight are reduced.

Description

Technical Field

[0001] The present invention relates to the field of near-eye display technology, and in particular to an optical component and a near-eye display device. Background Art

[0002] In recent years, augmented reality glasses (AR glasses) have successfully crossed over multiple fields such as military, industry, medical and daily consumption with their rapid development momentum. The essence of this type of glasses is that they can seamlessly integrate virtual images with the real world and present them together in the user's field of vision, allowing users to intuitively observe embedded virtual elements in real scenes. AR glasses designed based on various optical principles such as plane translucency and semi-reflection, free-form surface translucency and semi-reflection, geometric optical waveguides, refractive-reflective structures (commonly known as Birdbath), and diffraction optical waveguides have emerged on the market. Among them, the refractive-reflective structure has been widely used in commercial products due to its excellent optical resolution and low distortion characteristics.

[0003] The Birdbath solution is one of the current mainstream near-eye display optical design solutions. Its notable feature is the use of a dual-screen architecture to provide optical image sources for the left and right eyes respectively. Although this design can effectively realize binocular display functions, the use of dual screens significantly increases the overall cost of the system, which to some extent hinders the further promotion and popularization of near-eye display technology. Summary of the invention

[0004] The embodiments of the present application provide an optical component and a near-eye display device. The optical component can achieve a binocular display effect by cooperating with a single light engine, thereby reducing costs and weight.

[0005] The present application provides an optical component, including:

[0006] A beam splitter prism is provided with a first light emitting surface and a second light emitting surface;

[0007] A first folded optical path component and a second folded optical path component, wherein the first folded optical path component corresponds to the first light-emitting surface of the beam splitter prism, and the second folded optical path component corresponds to the second light-emitting surface of the beam splitter prism.

[0008] In some embodiments, the beam splitter prism includes a first prism, a first reflective layer and a second reflective layer, the first prism is provided with a first prism face and a second prism face, the first reflective layer is provided on the first prism face, the second reflective layer is provided on the second prism face, the first prism face faces the first folded optical path component, and the second prism face faces the second folded optical path component.

[0009] In some embodiments, the beam splitter prism also includes a second prism, a third prism, a first polarized reflective layer and a first quarter wave plate, the second prism is arranged on the first prism surface, the third prism is arranged on the second prism surface, the first polarized reflective layer is arranged on the side of the second prism and / or the third prism away from the first prism, and the first quarter wave plate is arranged on the side of the first polarized reflective layer away from the second prism and / or the third prism.

[0010] In some embodiments, the second prism has a fourth facet, a fifth facet and a sixth facet connected in sequence, and the fourth facet is bonded to the first facet; the third prism has a seventh facet, an eighth facet and a ninth facet, the seventh facet is bonded to the second facet, and the sixth facet is arranged opposite to the ninth facet; the first polarized reflection layer is arranged on the fifth facet and the eighth facet, the sixth facet is the first light-emitting surface, and the ninth facet is the second light-emitting surface.

[0011] In some embodiments, the first folded optical path component includes a second polarized reflection layer, a second quarter-wave plate and a first reflector, the second polarized reflection layer and the second quarter-wave plate are obliquely arranged on the optical path of the light emitted from the first light-emitting surface, and the first reflector is arranged on the side of the second quarter-wave plate away from the splitter prism.

[0012] In some embodiments, the first reflector has a concave surface that faces the second quarter wave plate.

[0013] In some embodiments, the optical component also includes a first plane mirror and a second plane mirror, the first plane mirror and the second plane mirror are arranged on both sides of the second polarized reflection layer and the second quarter wave plate, the first plane mirror, the first reflection mirror and the second plane mirror are connected and surrounded in sequence to form a first accommodating space, and the second polarized reflection layer and the second quarter wave plate are arranged in the first accommodating space.

[0014] In some embodiments, the optical component further includes a first lens group, and the first lens group is disposed between the beam splitter prism and the first folding optical path component.

[0015] In some embodiments, the first lens group includes a plurality of lenses, and the plurality of lenses are sequentially arranged on the optical path of the light emitted from the first light emitting surface.

[0016] The embodiment of the present application also provides a near-eye display device, including:

[0017] Light Engine;

[0018] The optical component is the above optical component, and the optical component is arranged opposite to the light engine.

[0019] In the optical assembly and near-eye display device provided in the embodiment of the present application, the optical assembly includes a beam splitter prism, a first folded optical path assembly and a second folded optical path assembly, which can split the light from a single light engine into two parts, and the two parts of the light are transmitted from the first light exit surface and the second light exit surface of the beam splitter prism respectively. Such a design avoids the need to equip each eye with a light engine in the traditional method, thereby significantly reducing the cost and reducing the weight of the entire near-eye display device. The first folded optical path assembly corresponds to the first light exit surface, and is used to receive and guide the light emitted from the first light exit surface to the user's left eye. Similarly, the second folded optical path assembly corresponds to the second light exit surface, and is used to receive and guide the light emitted from the second light exit surface to the user's right eye. These two folded optical path assemblies not only ensure the correct transmission of light, but also may optimize the clarity, contrast and field of view of the image through a specific optical design, thereby enhancing the user's viewing experience. In summary, the optical assembly provided in the embodiment of the present application achieves the effect of supporting binocular display with a single light engine by cleverly utilizing the beam splitter prism and the folded optical path assembly. It not only reduces costs and weight, but is also expected to have broad application prospects in fields such as augmented reality (AR), virtual reality (VR) and wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the first structure of an optical component provided in an embodiment of the present application.

[0022] Figure 2 A second structural schematic diagram of the optical component provided in an embodiment of the present application.

[0023] Figure 3 A schematic diagram of the structure of a beam splitter prism provided in an embodiment of the present application.

[0024] Figure 4 A third structural schematic diagram of the optical component provided in an embodiment of the present application.

[0025] Figure 5 This is a first MTF diagram of the optical component provided in an embodiment of the present application.

[0026] Figure 6This is a second MTF diagram of the optical component provided in an embodiment of the present application.

[0027] Figure 7 A first structural schematic diagram of a near-eye display device provided in an embodiment of the present application.

[0028] Figure 8 A first structural schematic diagram of a near-eye display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] See also Figure 1 , Figure 1 A schematic diagram of the first structure of an optical component provided in an embodiment of the present application.

[0031] The present application provides an optical component 100, which includes a beam splitter prism 10, a first folding optical path component 20 and a second folding optical path component 30. The beam splitter prism 10 is provided with a first light emitting surface 11 and a second light emitting surface 12. The first folding optical path component 20 corresponds to the first light emitting surface 11 of the beam splitter prism 10, and the second folding optical path component 30 corresponds to the second light emitting surface 12 of the beam splitter prism 10.

[0032] Please continue reading Figure 1 as well as Figure 2 , Figure 2 A second structural schematic diagram of the optical component provided in an embodiment of the present application.

[0033] The optical component 100 includes a beam splitter prism 10, a first folded optical path component 20, and a second folded optical path component 30, which can split the light from a single light engine 200 into two parts, and the two parts of light are transmitted from the first light exit surface 11 and the second light exit surface 12 of the beam splitter prism 10 respectively. Such a design avoids the need to equip each eye with a light engine 200 in the traditional method, thereby significantly reducing the cost and reducing the weight of the entire near-eye display device 1. The first folded optical path component 20 corresponds to the first light exit surface 11, and is used to receive and guide the light emitted from the first light exit surface 11 to the user's left eye. Similarly, the second folded optical path component 30 corresponds to the second light exit surface 12, and is used to receive and guide the light emitted from the second light exit surface 12 to the user's right eye. The two folded optical path components not only ensure the correct transmission of light, but also optimize the clarity, contrast and field of view of the image through a specific optical design, thereby enhancing the user's viewing experience. In summary, the optical assembly 100 provided in the embodiment of the present application achieves the effect of supporting binocular display with a single light engine 200 by cleverly utilizing the beam splitter prism 10 and the folded optical path assembly. This not only reduces the cost and weight, but is also expected to have broad application prospects in the fields of augmented reality (AR), virtual reality (VR), and wearable devices.

[0034] Please continue reading Figure 2 as well as Figure 3 , Figure 3 A schematic diagram of the structure of a beam splitter prism provided in an embodiment of the present application. The beam splitter prism 10 includes a first prism 13, a first reflective layer 141, and a second reflective layer 142. The first prism 13 is provided with a first prism face 131 and a second prism face 132. The first reflective layer 141 is provided on the first prism face 131, and the second reflective layer 142 is provided on the second prism face 132. The first prism face 131 faces the first folded optical path component 20, and the second prism face 132 faces the second folded optical path component 30. Both of these reflective layers have the function of reflecting light, ensuring that the light can be effectively guided to the corresponding folded optical path component.

[0035] The first prism 131 and the second prism 132 are at an angle to each other and together form a first edge. The light emitted by the light engine 200 can be split into two and enter the first folded optical path component 20 and the second folded optical path component 30 respectively after being reflected by the first reflective layer 141 and the second reflective layer 142.

[0036] Furthermore, the first prism 13 may be a triangular prism, which has a third prism 133 connected to the first prism face 131 and the second prism face 132 in addition to the first prism face 131 and the second prism face 132. In this particular structure, the angle between the first prism face 131 and the second prism face 132 is set to 90°, while the angles between the first prism face 131 and the third prism face 133, and between the second prism face 132 and the third prism face 133 are both 45°. This design not only achieves accurate division and guidance of light, but also gives the beam splitter prism 10 a certain degree of symmetry, so that a corresponding matching relationship is formed between the first prism face 131 and the first folded optical path component 20, and between the second prism face 132 and the second folded optical path component 30.

[0037] In terms of working principle, when the light emitted by the light engine 200 passes through the beam splitter prism 10, it will be reflected by the first reflective layer 141 and the second reflective layer 142 respectively, and then enter the first folded optical path component 20 and the second folded optical path component 30 respectively. This process realizes the effective division and independent control of the light, which greatly facilitates the subsequent optical processing or display.

[0038] Please continue to read Figure 2 as well as Figure 3 The beam splitter prism 10 also includes a second prism 15, a third prism 16, a first polarized reflective layer 17 and a first quarter wave plate 18. The second prism 15 is arranged on the first prism face 131, the third prism 16 is arranged on the second prism face 132, the first polarized reflective layer 17 is arranged on a side of the second prism 15 and / or the third prism 16 away from the first prism 13, and the first quarter wave plate 18 is arranged on a side of the first polarized reflective layer 17 away from the second prism 15 and / or the third prism 16.

[0039] The shapes of the second prism 15, the third prism 16 and the first prism 13 are preferably the same triangular prism form. This design not only simplifies the processing and assembly process, but also ensures the symmetry and stability of the optical path. When these prisms are assembled together by precise splicing, the second prism 15 and the third prism 16 are symmetrically arranged relative to the first prism 13. This configuration greatly promotes the uniform distribution and efficient use of light. A first quarter wave plate 18 and a first polarized reflection layer 17 are arranged on the second prism 15 and the third prism 16. The function of the first polarized reflection layer 17 is to selectively reflect and transmit according to the polarization state of the light, laying the foundation for subsequent polarization conversion and path guidance. Next, the first quarter wave plate 18 is placed on the outside of the first polarized reflection layer 17, that is, on the side away from the second prism 15 and / or the third prism 16, and is responsible for converting the polarization state of the incident light, and is a key component for realizing complex optical path control.

[0040] More specifically, the light engine 200 is located on the side of the second prism 15 and the third prism 16 away from the first prism 13. For example, in the natural light emitted by the light engine 200, after passing through the first quarter wave plate 18 on the second prism 15, the polarization state of the light does not change, and part of the light passes through the first polarization reflection layer 17 on the second prism 15 again to become the first polarized light, and after passing through the second prism 15, the first polarized light is reflected by the first reflection layer 141 on the first prism 13 to the first folded optical path component 20; another part of the light is reflected by the first polarization reflection layer 17 on the second prism 15 to become the second polarized light, and the second polarized light passes through the first quarter wave plate 18 again to become the circular polarized light, and the circular polarized light subsequently passes through the first quarter wave plate 18 and the first polarization reflection layer 17 on the third prism 16 in sequence to become the first polarized light, and the first polarized light continues to propagate to the second folded optical path component 30.

[0041] It is understandable that the natural light incident on the light engine 200 includes a first polarized light and a second polarized light, both of which are linearly polarized light, and the polarization directions of the first polarized light and the second polarized light are different. For example, the first polarized light is P light, and the second polarized light is S light. The first polarized reflection layer 17 can transmit P light and reflect S light. The polarization state of the natural light does not change when it passes through the first quarter wave plate 18 for the first time, and the first polarized light changes to the second polarized light when the natural light passes through the first quarter wave plate 18 twice.

[0042] The same light path processing logic is also applicable to the third prism 16, except that the final direction of the light is different, thereby realizing efficient dual-path distribution of the light: in the natural light emitted by the light engine 200, the light does not change its polarization state after passing through the first quarter wave plate 18 on the third prism 16, and part of the light passes through the first polarized reflection layer 17 on the third prism 16 again to become first polarized light, and the first polarized light passes through the third prism 16 and is reflected by the second reflection layer 142 on the first prism 13 to the second folded light path component 30; another part of the light is reflected by the first polarized reflection layer 17 on the third prism 16 to become second polarized light, and the second polarized light passes through the first quarter wave plate 18 again to become circularly polarized light, and the circularly polarized light subsequently passes through the first quarter wave plate 18 and the first polarized reflection layer 17 on the second prism 15 in sequence to become first polarized light, and the first polarized light continues to propagate to the first folded light path component 20.

[0043] The beam splitter prism 10 utilizes almost 100% of the light emitted by the light engine 200, splits the light into two and enters the first folded optical path component 20 and the second folded optical path component 30 for processing, and greatly reduces stray light. It has the advantages of high light energy utilization and low stray light, and has great application prospects.

[0044] In addition, in order to enhance the flexibility and adaptability of the design, the first polarized reflective layer 17 is subdivided into a first sub-polarized reflective layer and a second sub-polarized reflective layer, which are respectively disposed on the second prism 15 and the third prism 16. Similarly, the first quarter wave plate 18 is also divided into a first sub-quarter wave plate and a second sub-quarter wave plate, which are respectively disposed correspondingly. Specifically, the polarized reflective layer may include a first sub-polarized reflective layer and a second sub-polarized reflective layer, the first sub-polarized reflective layer being disposed on a side of the second prism 15 away from the first prism 13, and the second sub-polarized reflective layer being disposed on a side of the third prism 16 away from the first prism 13. The first quarter wave plate 18 may include a first sub-quarter wave plate and a second sub-quarter wave plate, the first sub-quarter wave plate being disposed on a side of the first sub-polarized reflective layer away from the second prism 15, and the second sub-quarter wave plate being disposed on a side of the second sub-polarized reflective layer away from the second prism 15. The above allows the first polarized reflective layer 17 and the first quarter wave plate 18 to be installed as independent components or integrated as needed, which greatly improves the configurability and installation convenience of the beam splitter prism 10.

[0045] The second prism 15 has a fourth prism face 151, a fifth prism face 152 and a sixth prism face 153 connected in sequence, the fourth prism face 151 and the fifth prism face 152 form a second edge, the angle between the fourth prism face 151 and the fifth prism face 152 is 90°, the angle between the fourth prism face 151 and the sixth prism face 153 is 45°, and the angle between the fifth prism face 152 and the sixth prism face 153 is 45°. When the second prism 15 is spliced ​​on the first prism 13, the first edge is collinear with the second edge, and the fifth prism face 152 is in contact with the first prism face 131, thereby ensuring the continuity and stability of the optical path.

[0046] The third prism 16 has a seventh prism face 161, an eighth prism face 162 and a ninth prism face 163 connected in sequence, the seventh prism face 161 and the eighth prism face 162 form a third edge, the angle between the seventh prism face 161 and the eighth prism face 162 is 90°, the angle between the seventh prism face 161 and the ninth prism face 163 is 45°, and the angle between the eighth prism face 162 and the ninth prism face 163 is 45°. When the third prism 16 is spliced ​​on the first prism 13, the first edge, the second edge and the third edge are in line, and the eighth prism face 162 is in contact with the second prism face 132, further strengthening the structural integrity and optical performance of the entire optical system.

[0047] Through the cooperation of the first prism 13, the second prism 15 and the third prism 16, the fifth prism face 152 and the eighth prism face 162 are arranged opposite to each other and form an angle of 90 degrees. The first quarter wave plate 18 and the first polarized reflection layer 17 are arranged on the fifth prism face 152 and the eighth prism face 162, the sixth prism face 153 is the first light emitting surface 11, and the ninth prism face 163 is the second light emitting surface 12.

[0048] The beam splitter prism 10 further includes a fourth prism 19, which is disposed between the second prism 15 and the third prism 16. The first prism 13, the second prism 15, the third prism 16 and the fourth prism 19 form a rectangular parallelepiped or a cube. The fourth prism 19 includes a tenth prism face 191, an eleventh prism face 192 and a twelfth prism face 193. The tenth prism face 191 and the eleventh prism face 192 form a fourth edge. The angle between the tenth prism face 191 and the eleventh prism face 192 is 90°, the angle between the tenth prism face 191 and the twelfth prism face 193 is 45°, and the angle between the eleventh prism face 192 and the twelfth prism face 193 is 45°. The tenth prism face 191 corresponds to the fourth prism face 151, and the eleventh prism face 192 corresponds to the seventh prism face 161. The fourth prism 19 not only enhances the mechanical stability of the entire beam splitter prism 10 , but also provides more possibilities for precise manipulation of light.

[0049] See also Figure 1 The first folded optical path component 20 includes a second polarized reflective layer 21, a second quarter wave plate 22 and a first reflector 23. The second polarized reflective layer 21 and the second quarter wave plate 22 are tilted on the optical path of the light emitted from the first light emitting surface 11. The tilted arrangement not only ensures that the light can be incident on these optical elements smoothly, but also enables the light to undergo the expected polarization state change and path turning when passing through these elements. The first reflector 23 is arranged on the side of the second quarter wave plate 22 away from the beam splitter prism 10.

[0050] The light emitted from the first light emitting surface 11 of the beam splitter prism 10 is the first polarized light. When this light enters the second polarized reflection layer 21, if its polarization direction is consistent with the direction allowed by the polarized reflection layer, the light will maintain the original polarization state and continue to propagate.

[0051] The light maintaining the original polarization state will be incident on the second quarter wave plate 22. The quarter wave plate is a special optical element that can convert linear polarized light into circular polarized light, or convert circular polarized light into linear polarized light, depending on the incident angle of the light and the fast axis direction of the wave plate. In this example, the second quarter wave plate 22 converts the incident first polarized light into circular polarized light.

[0052] Subsequently, the circularly polarized light is reflected by the first reflector 23 back to the second quarter wave plate 22. The first reflector 23 is used to change the propagation direction of the light without changing its polarization state (in an ideal case). Therefore, after the circularly polarized light is reflected by the reflector, its polarization state remains unchanged.

[0053] When the circularly polarized light passes through the second quarter wave plate 22 again, its polarization state changes, and the circularly polarized light is converted into another linearly polarized light, namely, the second polarized light. This conversion process is the result of the combined effect of the birefringence effect of the wave plate and the incident angle of the light.

[0054] Finally, the second polarized light is incident on the second polarized reflective layer 21 again. At this time, if its polarization direction is consistent with the direction allowed to be reflected by the second polarized reflective layer 21, the light will be reflected to the human eye or other target positions. In this way, through the synergistic effect of the second polarized reflective layer 21, the second quarter-wave plate 22 and the first reflector 23, the first folded optical path assembly 20 realizes the precise control of light and the flexible conversion of polarization state.

[0055] In order to make the light incident on the human eye parallel light, the second polarized reflective layer 21 and the second quarter wave plate 22 in the present invention are set to an angle of 45° relative to the light emitted from the first light exit surface 11. When the light is incident on the second polarized reflective layer 21 and the second quarter wave plate 22 at an angle of 45°, it can be ensured that the light can still maintain parallelism after reflection and polarization state conversion, thereby meeting the requirements of the near-eye display device 1 for light quality.

[0056] First, it is incident on the second polarized reflective layer 21 at an angle of 45°. If the polarization direction of the light is consistent with the direction allowed to pass through the second polarized reflective layer 21, the light will maintain the original polarization state and continue to propagate, and then be incident on the second quarter wave plate 22. The wave plate converts the linear polarized light into circular polarized light, and then the circular polarized light is reflected back to the second quarter wave plate 22 by the first reflector 23, and is converted into linear polarized light of another polarization state when passing through the second quarter wave plate 22 again. Finally, this linear polarized light is incident on the second polarized reflective layer 21 again and is reflected to the human eye. Due to the overlapping design of the optical path and the precise arrangement of the components, the light maintains parallelism throughout the process, and the thickness of the device is effectively controlled.

[0057] The first folded optical path component 20 further includes a first transparent substrate 24, which is tiltedly disposed on the optical path of the light emitted from the first light emitting surface 11. The first transparent substrate 24 is stacked with the second polarizing reflection layer 21 and the second quarter wave plate 22, and can support the second polarizing reflection layer 21 and the second quarter wave plate 22.

[0058] The second folded optical path component 30 includes a third polarized reflection layer 31, a third quarter wave plate 32 and a second reflector 33. The arrangement and functional design of these components are similar to the corresponding components in the first folded optical path component 20, but they act on different light paths. The third polarized reflection layer 31 and the third quarter wave plate 32 are obliquely arranged on the light path of the light emitted from the second light emitting surface 12, and the second reflector 33 is arranged on the side of the third quarter wave plate 32 away from the beam splitter prism 10. The light path in the second folded optical path component 30 is the same as the light path in the first folded optical path component 20, so it has the same technical effect as the first folded optical path component 20, which will not be described in detail here.

[0059] The third polarized reflective layer 31 and the third quarter wave plate 32 are inclined at an angle of 45° relative to the light emitted from the second light emitting surface 12 . The thickness of the near-eye display device can be effectively reduced by increasing the overlap of the light paths.

[0060] The second folded optical path assembly 30 further includes a second transparent substrate 34, which is tiltedly disposed on the optical path of the light emitted from the second light emitting surface 12. The second transparent substrate 34 is stacked with the third polarized reflective layer 31 and the third quarter wave plate 32, and can support the third polarized reflective layer 31 and the third quarter wave plate 32.

[0061] The folding of light in the first folded optical path component 20 and the second folded optical path component 30 substantially increases the propagation distance of the light, thereby extending the focal length in disguise. This feature allows the present invention to use thinner lenses to replace traditional heavy lenses, thereby achieving overall lightness and thinness of the optical system while ensuring high imaging quality. This is of great significance for improving the portability and user comfort of near-eye display devices.

[0062] The first reflector 23 has a concave surface, which faces the second quarter wave plate 22. That is, the first reflector 23 not only has a reflective function, but also can adjust the angle at which the light is incident on the third polarized reflective layer 31, so that the light reflected by the third polarized reflective layer 31 can be reflected in parallel to the third polarized reflective layer 31, and then enter the human eye in parallel.

[0063] In addition, in order to enhance the structural stability and sealing of the optical component 100, the optical component 100 further includes a first plane mirror 41 and a second plane mirror 42, which are arranged on both sides of the second polarized reflection layer 21 and the second quarter wave plate 22, and the first plane mirror 41, the first reflection mirror 23 and the second plane mirror 42 are sequentially connected and surrounded to form a first accommodation space 70, and the second polarized reflection layer 21 and the second quarter wave plate 22 are arranged in the first accommodation space 70. In this accommodation space, the second polarized reflection layer 21 and the second quarter wave plate 22 are properly protected, and the intrusion of pollutants such as dust is effectively avoided.

[0064] Symmetrically, the optical component 100 further includes a third plane mirror 43 and a fourth plane mirror 44, which are arranged on both sides of the third polarized reflection layer 31 and the third quarter wave plate 32. The third plane mirror 43, the second reflection mirror 33 and the fourth plane mirror 44 are sequentially connected and surrounded to form a second accommodation space 80, and the third polarized reflection layer 31 and the third quarter wave plate 32 are arranged in the second accommodation space 80. It is worth noting that the fourth plane mirror 44, the third plane mirror 43 and the first plane mirror 41 and the second plane mirror 42 are completely identical in function, and are all used to improve the sealing of the corresponding polarized reflection layer and the quarter wave plate to prevent the intrusion of pollutants such as dust.

[0065] See also Figure 1 The optical assembly 100 further includes a first lens group 50, which is disposed between the beam splitter prism 10 and the first folded optical path assembly 20. The first lens group 50 can adjust the optical path so that all the light can pass through the second polarized reflection layer 21. The first lens group 50 can be disposed in the first accommodation space 70.

[0066] See also Figure 4 , Figure 4 A third structural schematic diagram of an optical component provided in an embodiment of the present application. The first lens group 50 includes a plurality of first lenses 51, which are sequentially arranged on the optical path of the light emitted from the first light-emitting surface 11. The plurality of first lenses 51 work together to form a first image plane 52. After the first image plane 52 passes through the second polarizing reflection layer 21, the second quarter-wave plate 22 and the first reflector 23, it can enter the human eye to form an enlarged virtual image. Through the secondary imaging technology, the present invention achieves a larger field of view, providing users with a wider field of view.

[0067] Symmetrically, the optical assembly 100 further includes a second lens group 60, which is disposed between the beam splitter prism 10 and the second folded optical path assembly 30. The second lens group 60 includes a plurality of second lenses 61, which are sequentially disposed on the optical path of the light emitted from the first light exiting surface 11. The second lens group 60 has the same structure as the first lens group 50, so the technical effects produced are the same, which will not be described in detail herein.

[0068] See also Figure 5 as well as Figure 6 , Figure 5 The MTF diagram of the optical assembly provided in the embodiment of the present application corresponds to the number of lenses in the first lens group 50 and the second lens group 60 being only one; Figure 6 The MTF diagram of the optical assembly provided in the embodiment of the present application corresponds to a plurality of lenses in the first lens group 50 and / or the second lens group 60. Figure 5 It can be seen that the MTF (Modulation Transfer Function) diagram of the optical component 100 can show that the average MTF of the optical component 100 at 60lp / mm is greater than 0.7. Figure 6 It can be seen that the MTF diagram of the optical component 100 can show that the average MTF of the field of view of the optical component 100 at 60lp / mm is greater than 0.8. It can be seen that the field of view formed by the first lens group and the second lens group having multiple lenses is significantly increased compared with the optical component 100 in the prior art, the field of view of the optical component 100 is greater than 60°, and the distortion of the image displayed by the optical component 100 is less than 1%.

[0069] The present application also provides a near-eye display device 1, comprising a light engine 200 and the optical component 100 and the light engine 200 in the above embodiment, wherein the optical component 100 and the light engine 200 are arranged opposite to each other.

[0070] The near-eye display device 1 is a device that is arranged in a certain distance (usually 2-5 cm) in front of the user's eyes and directly presents the display content in front of the user, such as a head-mounted display in a virtual reality (VR) device, an optical perspective glasses in an augmented reality (AR) device, etc. The near-eye display device 1 includes but is not limited to head-mounted devices such as AR glasses and AR helmets, and its application range is wide and flexible.

[0071] The light engine 200 is responsible for emitting light and forming an image. The light engine 200 in this embodiment may include various types such as LED miniaturization and matrix technology display screen (Micro LED display screen), OLED miniaturization and matrix technology display screen (Micro OLED display screen), laser beam scanning display screen (LBS display screen) and digital mirror display screen (DMD display screen). These advanced display screen technologies ensure the high resolution and color accuracy of virtual images, providing users with a more realistic and vivid visual experience. The light engine 200 is also called a micro-projection optical machine, a micro-display screen, an optical machine, etc. If these terms are not specifically specified, they can be used interchangeably in this application. The display screen size of the light engine 200 can be 0.4 to 0.7".

[0072] Also, see Figure 8 , Figure 8 A second structural diagram of a near-eye display device provided in an embodiment of the present application. The near-eye display device 1 is also equipped with key components such as a processor and a fixing member 300. The processor is responsible for receiving instructions, data processing, and controlling other components to ensure the overall smooth operation of the device. The fixing member 300 includes a glasses temple 301 and a frame 302, which are used to install, fix or carry the above-mentioned optical component 100, ensuring the stability and comfort of the entire device, and facilitating users to wear it for a long time.

[0073] The near-eye display device 1 may also include components such as sensors, circuits, output devices, and batteries or solar cells. The sensors can monitor the user's head movements or eye movements in real time, thereby adjusting the position and angle of the virtual image to further enhance the user experience. The circuit is responsible for connecting the various components to achieve information transmission and processing. The output device is used to display virtual images or issue sound prompts to the user. The battery or solar cell provides continuous power support for the device to ensure long-term operation of the device.

[0074] In addition, the near-eye display device 1 can also adopt designs such as wraparound lenses, adaptable glasses or auxiliary frames to meet the wearing needs of different users. At the same time, the device can also be equipped with a strap for fixing to ensure that the user can maintain stability and comfort during use.

[0075] In the optical assembly 100 and the near-eye display device 1 provided in the embodiment of the present application, the optical assembly 100 includes a beam splitter prism 10, a first folded optical path assembly 20, and a second folded optical path assembly 30, which can split the light from a single light engine 200 into two parts, and the two parts of light are transmitted from the first light exit surface 11 and the second light exit surface 12 of the beam splitter prism 10 respectively. Such a design avoids the need to equip each eye with a light engine 200 in the traditional method, thereby significantly reducing the cost and reducing the weight of the entire near-eye display device 1. The first folded optical path assembly 20 corresponds to the first light exit surface 11, and is used to receive and guide the light emitted from the first light exit surface 11 to the left eye of the user. Similarly, the second folded optical path assembly 30 corresponds to the second light exit surface 12, and is used to receive and guide the light emitted from the second light exit surface 12 to the right eye of the user. These two folded optical path assemblies not only ensure the correct transmission of light, but also optimize the clarity, contrast and field of view of the image through a specific optical design, thereby improving the user's viewing experience. In summary, the optical assembly 100 provided in the embodiment of the present application achieves the effect of supporting binocular display with a single light engine 200 by cleverly utilizing the beam splitter prism 10 and the folded optical path assembly. This not only reduces the cost and weight, but is also expected to have broad application prospects in the fields of augmented reality (AR), virtual reality (VR), and wearable devices.

[0076] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0077] In the description of this application, 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0078] The optical components and near-eye display devices provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical component, characterized in that: include: A beam splitter prism, wherein the beam splitter prism is provided with a first light emitting surface and a second light emitting surface; A first folded optical path component and a second folded optical path component, wherein the first folded optical path component corresponds to the first light-emitting surface of the beam splitter prism, and the second folded optical path component corresponds to the second light-emitting surface of the beam splitter prism.

2. The optical component according to claim 1, characterized in that The beam splitter prism includes a first prism, a first reflecting layer and a second reflecting layer. The first prism is provided with a first prism face and a second prism face. The first reflecting layer is arranged on the first prism face, and the second reflecting layer is arranged on the second prism face. The first prism face faces the first folding optical path component, and the second prism face faces the second folding optical path component.

3. The optical component according to claim 2, characterized in that The beam splitter prism also includes a second prism, a third prism, a first polarized reflective layer and a first quarter wave plate, the second prism is arranged on the first prism surface, the third prism is arranged on the second prism surface, the first polarized reflective layer is arranged on a side of the second prism and / or the third prism away from the first prism, and the first quarter wave plate is arranged on a side of the first polarized reflective layer away from the second prism and / or the third prism.

4. The optical component according to claim 3, characterized in that The second prism has a fourth prism face, a fifth prism face and a sixth prism face connected in sequence, and the fourth prism face is bonded to the first prism face; the third prism has a seventh prism face, an eighth prism face and a ninth prism face connected in sequence, the seventh prism face is bonded to the second prism face, and the sixth prism face is arranged opposite to the ninth prism face; the first polarized reflection layer is arranged on the fifth prism face and the eighth prism face, the sixth prism face is the first light-emitting surface, and the ninth prism face is the second light-emitting surface.

5. The optical component according to any one of claims 1 to 4, characterized in that: The first folded optical path component includes a second polarized reflection layer, a second quarter-wave plate and a first reflector. The second polarized reflection layer and the second quarter-wave plate are obliquely arranged on the optical path of the light emitted from the first light-emitting surface, and the first reflector is arranged on the side of the second quarter-wave plate away from the splitter prism.

6. The optical component according to claim 5, characterized in that The first reflector has a concave surface, which faces the second quarter wave plate.

7. The optical component according to claim 5, characterized in that It also includes a first plane mirror and a second plane mirror, wherein the first plane mirror and the second plane mirror are arranged on both sides of the second polarized reflection layer and the second quarter wave plate, the first plane mirror, the first reflection mirror and the second plane mirror are connected and surrounded in sequence to form a first accommodating space, and the second polarized reflection layer and the second quarter wave plate are arranged in the first accommodating space.

8. The optical component according to any one of claims 1 to 4, characterized in that: It also includes a first lens group, which is arranged between the beam splitter prism and the first folding optical path component.

9. The optical component according to claim 8, characterized in that The first lens group includes a plurality of lenses, and the plurality of lenses are sequentially arranged on the optical path of the light emitted from the first light emitting surface.

10. A near-eye display device, characterized in that: include: Light Engine; An optical component, wherein the optical component is the optical component according to any one of claims 1 to 9, and the optical component is arranged opposite to the light engine.

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