Optical machine module and AR glasses

Abstract

The utility model relates to an optical machine module and AR glasses, the optical machine module comprises a display assembly, an imaging assembly, a turning prism and a conversion film layer, the display assembly is used for providing polarized image light, the imaging assembly is used for projecting the polarized image light, and the turning prism is provided with a display surface corresponding to the display assembly and an emergent surface corresponding to the imaging assembly. The polarization light splitting assembly is used for transmitting the polarization image light to the imaging assembly for projection imaging, and the conversion film layer comprises a first polaroid located between the turning prism and the emergent surface and a first quarter-wave plate located between the turning prism and the first polaroid; the included angle between the fast axis of the first quarter-wave plate and the light transmission axis of the first polaroid is 45 degrees or 135 degrees; the first polarizer is used for transmitting first linearly polarized light and absorbing second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light. In this way, ghost images caused by reflection light of the residual interfaces on the two right-angle faces of the turning prism can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of AR display equipment, in particular to an optical machine module and AR glasses. Background Art

[0002] With the continuous development of new display technologies, near-eye display (NED) technologies such as augmented reality (AR) and virtual reality (VR) are becoming increasingly popular. The market for wearable display devices (such as AR glasses) is maturing. Currently, among the various solutions in the field of near-eye display, mainstream solutions include BB, free-form prisms, arrayed waveguides, and diffraction waveguides. Among them, AR optical modules based on waveguide solutions are widely adopted due to their compact size, light weight, and excellent user experience. Currently, mainstream waveguide-based display solutions include LCoS (Liquid Crystal on Silicon), LCD (Liquid Crystal Display), DLP (Digital Light Processing), etc. With the development of LED technology and micro-display chip technology, projection displays are becoming increasingly miniaturized.

[0003] The existing single-optical machine binocular waveguide solution requires a turning prism to couple the output light of the optical machine into the waveguide. The ghost image generated by the waveguide end can usually be removed by tilting the optical machine so that it has a corresponding angle relative to the waveguide plane, thereby moving this part of the reflected ghost image produced by the optical machine and the waveguide out of the field of view. At this time, the two right-angled surfaces of the turning prism are exposed to the air, and the residual interface reflections on the two right-angled surfaces will also cause certain ghost images in the field of view. Utility Model Content

[0004] Since ghost images are easily generated at the turning prism in existing optical waveguide AR glasses, it is necessary to provide an optical machine module and AR glasses.

[0005] Optical machine module, including:

[0006] a display assembly for providing polarized image light;

[0007] an imaging component for projecting the polarized image light;

[0008] a turning prism, located in the projection light path of the imaging assembly and used to change the direction of the polarized image light;

[0009] a polarization beam splitting component having a display surface corresponding to the display component and an exit surface corresponding to the imaging component, the polarization beam splitting component being used to transmit the polarized image light to the imaging component for projecting an image; and

[0010] The conversion film layer includes a first polarizer located between the turning prism and the exit surface and a first quarter-wave plate located between the turning prism and the first polarizer; the angle between the fast axis of the first quarter-wave plate and the transmission axis of the first polarizer is 45° or 135°; the first polarizer is used to transmit a first linearly polarized light and absorb a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light.

[0011] With this arrangement, by introducing a conversion film layer into the optical machine module, the polarization states of the effective polarized image light and the invalid ghost image are changed in a targeted manner. The effective polarized image light will be emitted in the form of circularly polarized light, and the ghost image will become a second linearly polarized light after passing through the first quarter-wave plate twice, and will be absorbed by the first polarizer and will not enter the polarization splitting component, thereby eliminating the conditional basis for the generation of ghost images.

[0012] In one embodiment, the first quarter-wave plate is glued to the first polarizer.

[0013] Such a setting facilitates the assembly of the optical machine module and improves the assembly accuracy, thereby enhancing the interception effect of ghost images. It also facilitates the pre-assembly between the first quarter-wave plate and the first polarizer, which is beneficial to improving the assembly quality and assembly efficiency of the product during mass production.

[0014] In one embodiment, the first polarizer is attached to the exit surface, and the conversion film layer further comprises an AR film attached to a side of the first quarter wave plate facing away from the first polarizer; or

[0015] The first quarter-wave plate is attached to the turning prism, and the conversion film layer further includes an AR film attached to a side of the first polarizer facing away from the first quarter-wave plate.

[0016] This setting further reduces the excess reflected light between the turning lens and the conversion film layer, improves the picture quality and increases the immersive feeling of the picture.

[0017] In one embodiment, the polarization beam splitting component further comprises a beam splitting surface for reflecting the first linearly polarized light and transmitting the second linearly polarized light, and an incident surface adjacent to the display surface and opposite to the exit surface;

[0018] The display assembly includes a display chip located on the display surface, an illumination module located on the incident surface, and a second polarizer located between the illumination module and the incident surface. The second polarizer is used to transmit the first linearly polarized light and absorb the second linearly polarized light.

[0019] With this arrangement, the display component generates polarized image light with the help of the polarized reflective component, which saves the internal space of the optical machine module and reduces the volume of the optical machine module. In addition, the second polarizer is arranged opposite to the first polarizer. Even if there is a second linearly polarized light passing through the first polarizer, it will directly pass through the polarization splitting component and be absorbed by the second polarizer, which further reduces the generation of ghost images.

[0020] In one embodiment, the polarization splitting component includes a first right-angle prism body providing the display surface and the incident surface, a second right-angle prism body providing the exit surface, and a polarization splitting element providing the splitting surface, and the first right-angle prism body and the second right-angle prism body are glued to the polarization splitting element.

[0021] With this arrangement, the polarization splitting component is easy to assemble with high precision. The gluing assembly method also eliminates the gap at the splitting surface, which is beneficial to reducing excess reflection at the splitting surface.

[0022] In one embodiment, the turning prism is a right-angle prism having a first right-angle surface corresponding to the exit surface and a second right-angle surface perpendicular to the first right-angle surface.

[0023] With this arrangement, when the polarized image light is reflected by the second right-angled surface of the turning prism, the light will return along the original light path without being deflected, thereby preventing stray light from being generated inside the turning prism.

[0024] In one embodiment, the polarization beam splitting component further comprises a reflective surface adjacent to the exit surface and opposite to the display surface;

[0025] The imaging assembly includes a first imaging lens located on the exit surface, a second imaging lens located on the reflection surface, and a second quarter-wave plate located between the reflection surface and the second imaging lens.

[0026] In this arrangement, the second imaging lens is used to reflect polarized light that passes through the splitting surface and the reflecting surface in sequence. Under the action of the second quarter-wave plate, the light reflected by the second imaging lens will reach the splitting surface again and be reflected to the exit surface. The imaging component uses the splitting surface of the polarization splitting component to achieve imaging. Compared with the traditional stacked arrangement, this folds the optical path and reduces the length of the optical machine module.

[0027] In one embodiment, the imaging assembly further includes a third imaging lens located between the display surface and the display assembly.

[0028] With this arrangement, the arrangement of the third imaging lens further disperses the lenses related to the imaging function in the imaging assembly and installs them at appropriate positions in the optical path, which increases the space in the optical machine module and is conducive to promoting the miniaturization of the optical machine module.

[0029] In one embodiment, the first imaging lens is located between the conversion film layer and the exit surface and is attached to the exit surface.

[0030] This arrangement further optimizes the arrangement of the lenses in the imaging assembly. Since there is no need to set up an additional fixing structure to fix the first imaging lens to ensure that the image is in alignment, the design of the optical machine module is simplified. The first imaging lens is fixed to the polarization splitting assembly, which also avoids the relative position between the first imaging lens and the polarization splitting assembly from tilting or shifting during use, thereby ensuring the imaging quality. The first imaging lens is fitted to the exit surface to ensure that light will not be reflected between the two, thereby avoiding the occurrence of ghost images.

[0031] In one embodiment, the first imaging lens is located between the conversion film layer and the turning prism and is attached to the first quarter-wave plate.

[0032] This arrangement further optimizes the arrangement of the lenses in the imaging assembly. The first imaging lens, the conversion film layer, and the polarization splitting assembly are relatively fixed, which improves the imaging accuracy. There is no need to coat the conversion film layer with AR film to reduce reflections, which is also beneficial for improving production efficiency and reducing production costs in mass production.

[0033] This application also provides AR glasses, including:

[0034] Binocular waveguide; and

[0035] As in the above-mentioned optical-mechanical module, the turning prism of the optical-mechanical module is correspondingly arranged on the light-incoming surface of the binocular waveguide.

[0036] With this setup, the AR display function is achieved through a single optical module corresponding to two waveguides. This one-to-two structure realizes the fusion of left and right eye images through the binocular waveguide itself, so the adjustment of the combined image can be omitted on the optical machine end, effectively simplifying the production process.

[0037] In summary, the optical module and AR glasses provided by this application have the following two main advantages over existing optical waveguide AR glasses:

[0038] 1. The single optical machine corresponding to the binocular waveguide eliminates the image combination adjustment step on the optical machine side, simplifying the production process of AR glasses;

[0039] Second, by arranging a conversion film layer between the turning prism of the optical machine module and the output surface of the polarization splitter component, the polarization states of the effective image light and the ghost image can be effectively changed and distinguished, and the ghost image energy can be targetedly screened and intercepted to achieve the elimination or improvement of the ghost image. The effective image light can be emitted in the form of circularly polarized light, and the light reflected back from the light-entering surface of the turning prism will pass through the first quarter-wave plate in the conversion film layer again, and will be converted from circularly polarized light to second linearly polarized light, thereby being intercepted and absorbed by the first polarizer in the conversion film layer. Even if there is a part of the light that is not intercepted, it will directly penetrate the polarization splitter component and be absorbed by the second polarizer, and will not reach the display chip again. Therefore, it will not cause the problem of overlapping with the effective image light, thereby effectively intercepting and eliminating ghost images. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of AR glasses in one embodiment provided in this application;

[0041] Figure 2 for Figure 1 Side views of the AR glasses shown with the optical module at two different tilt angles;

[0042] Figure 3 A schematic diagram of a portion of the structure of the optical-mechanical module in the first embodiment provided in this application;

[0043] Figure 4 This is a schematic structural diagram of the optical-mechanical module in the first embodiment provided in this application;

[0044] Figure 5 This is a schematic structural diagram of the optical-mechanical module in the second embodiment provided in this application;

[0045] Figure 6 This is a schematic structural diagram of the optical-mechanical module in the third embodiment provided in this application.

[0046] Reference numerals:

[0047] 10. Display component; 11. Display chip; 12. Illumination module; 13. Second polarizer; 20. Imaging component; 21. First imaging lens; 22. Second imaging lens; 23. Third imaging lens; 24. Second quarter-wave plate; 30. Turning prism; 301. First right-angle surface; 302. Second right-angle surface; 303. Coupling port; 40. Polarization splitting component; 401. Display surface; 402. Exit surface; 403. Incident surface; 404. Reflection surface; 41. First right-angle prism; 42. Second right-angle prism; 43. Polarization splitting element; 50. Conversion film layer; 51. First quarter-wave plate; 52. First polarizer; 60. Binocular waveguide. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0054] With the continuous development of new display technologies, near-eye display (NED) technologies such as augmented reality (AR) and virtual reality (VR) are becoming increasingly popular. The market for wearable display devices (such as AR glasses) is maturing. Currently, among the various solutions in the field of near-eye display, mainstream solutions include BB, free-form prisms, arrayed waveguides, and diffraction waveguides. Among them, AR optical modules based on waveguide solutions are widely adopted due to their compact size, light weight, and excellent user experience. Currently, mainstream waveguide-based display solutions include LCoS (Liquid Crystal on Silicon), LCD (Liquid Crystal Display), DLP (Digital Light Processing), etc. With the development of LED technology and micro-display chip technology, projection displays are becoming increasingly miniaturized. Wearable near-eye display systems have attracted much attention in recent years. While pursuing small size and high resolution, people are increasingly demanding the appearance of glasses with an Industry Design (ID) design. This also places higher demands on the size of the optical engine. Therefore, it is very important to minimize the size of the optical engine while ensuring the display effect while maintaining a good binocular display effect. Among them, binocular image formation, ghost image and stray light performance, brightness and contrast are all key concerns for the near-eye display experience.

[0055] Based on this, it is necessary to provide an optical machine module and AR glasses that are small in size and can eliminate ghost images.

[0056] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of AR glasses in one embodiment provided in this application. Figure 2 for Figure 1 The AR glasses shown are side views of the optical machine module at two different tilt angles. The AR glasses adopt a single optical machine binocular waveguide solution: the optical machine module is located between the left and right eyes, and a turning prism 30 is used to project light toward the binocular waveguide 60. Compared with the existing solution in which the left and right eye machines are each equipped with an optical machine, this arrangement does not require the two optical machines to adjust the image, thereby improving production efficiency and reducing production cycle and production cost. In this solution, a turning prism 30 is required to couple the output light of the optical machine into the binocular waveguide 60. Due to the gap between the binocular waveguide 60 and the turning prism 30, the ghost image generated by the waveguide end can usually be moved out of the field of view by tilting the optical machine so that it has a corresponding angle relative to the waveguide plane. However, because the display solution introduces a turning prism 30, the interface reflection remaining on the two right-angled surfaces of the turning prism 30 will also cause certain ghost images in the field of view. This application will further explain the reasons for the generation of these ghost images in conjunction with specific embodiments below.

[0057] See also Figure 3 , Figure 3This is a partial structural diagram of the optical machine module in the first embodiment provided by the present application. The solid line with an arrow in the figure represents the optical path of the effective image light, and the dotted line with an arrow represents the optical path of the invalid ghost image. In order to better distinguish the directions of the two optical paths, the starting point of the optical path of the ghost image is offset in the figure. In practice, the optical path of the image light and the optical path of the ghost image coincide at the second right-angle surface 302. Specifically, the optical machine module includes a display component 10, an imaging component 20, a turning prism 30 and a polarization splitting component 40. The display component 10 is used to provide polarized image light, and the imaging component 20 is used to project the polarized image light. The turning prism 30 is located in the projection optical path of the imaging component 20 and is used to change the direction of the polarized image light. The polarization splitting component 40 has a display surface 401 corresponding to the display component 10 and an exit surface 402 corresponding to the imaging component 20. The polarization splitting component 40 is used to transmit the polarized image light to the imaging component 20 for projection imaging. Specifically, in order to reduce the size of the entire optical machine module, the display component 10 includes a display chip 11, an illumination module 12 and a second polarizer 13. The display chip 11 is located on the display surface 401. The polarization splitting component 40 also has a splitting surface and an incident surface 403. The splitting surface is used to reflect the first linear polarized light (S state) and transmit the second linear polarized light (P state) perpendicular to the polarization direction of the first linear polarized light (S state). The second polarizer 13 is located between the incident surface 403 and the illumination module 12 (usually attached to the incident surface 403 to reduce the interface reflection at the incident surface 403) and is used to transmit the first linear polarized light (S state). ) and absorbs the second linear polarized light (P state). The incident surface 403 corresponds to the lighting module 12 and is adjacent to the display surface 401. The light emitted by the lighting module 12 passes through the second polarizer 13 to generate the first linear polarized light (S state). The first linear polarized light (S state) reaches the splitting surface and is reflected to the display chip 11. After being modulated by the display chip 11, the second linear polarized light (P state) is generated. The second linear polarized light passes through the splitting surface and is projected by the imaging component 20 to the turning prism 30. The polarized light emitted by the lighting module 12 is reflected by the splitting surface, and there is no need to set a separate reflecting surface 404, thereby simplifying the structure of the optical machine module.Specifically, in order to further reduce the length of the entire optical machine module, the imaging component 20 includes a first imaging lens 21, a second imaging lens 22 and a second quarter wave plate 24. The polarization splitting component 40 also has a reflecting surface 404 adjacent to the exit surface 402 and opposite to the display surface 401. The second quarter wave plate 24 is attached to the reflecting surface 404. The second imaging lens 22 is attached to the second quarter wave plate 24 and is used to reflect the light passing through the second quarter wave plate 24. The second linearly polarized light (P state) passing through the splitting surface passes through the second quarter wave plate 24 twice and is then It is converted into a first linear polarized light (S state), which is reflected toward the exit surface 402 after reaching the splitting surface. The first linear polarized light (S state) emitted from the exit surface 402 passes through the first right-angled surface 301 and the second right-angled surface 302 of the turning prism 30 in sequence and then is emitted from the second right-angled surface 302. The optical machine module is also provided with a coupling port 303 located on the second right-angled surface 302. The first linear polarized light (S state) is emitted into the binocular waveguide from the coupling port 303. This arrangement folds the light path and does not require stacking the lenses according to the traditional solution, thereby reducing the length of the optical machine module. It is worth noting that, for the sake of convenience of illustration, this application uses the first linear polarized light in the S state and the second linear polarized light in the P state to represent the propagation path of the light. It can be understood that in other embodiments, the polarization direction of the first linear polarized light can also be other directions, as long as the polarization directions of the first linear polarized light and the second linear polarized light are perpendicular to each other.

[0058] In the above-mentioned optical machine module, due to the difference in refractive index of the two media at the interface at the first right-angle surface 301 and the second right-angle surface 302, the turning prism 30 will be refracted and reflected simultaneously when the polarized image light reaches these two interfaces, and the polarization state of the reflected light and the polarized image light is the same, so the reflected light will return along the original path. When the first linear polarized light (S state) reaches the display chip 11 on the way back, it will turn back again and enter the human eye through the binocular waveguide again, and form a "ghost image" within the field of view of the human eye. In addition, the ghost images caused by the two right-angle surfaces are superimposed on each other, resulting in higher ghost image energy, which further increases the interference with the effective image light.

[0059] Based on this, see Figure 4 , Figure 4The structure schematic diagram of the light engine module provided in the first embodiment of the present application is shown in FIG. 1. The light engine module provided in the present application further comprises a conversion film layer 50, which comprises a first polarizer 52 located between the turning prism 30 and the exit surface 402, and a first quarter-wave plate 51 located between the turning prism 30 and the first polarizer 52. The included angle between the fast axis of the first quarter-wave plate 51 and the light transmission axis of the first polarizer 52 is 45° or 135°. The first polarizer 52 is used for transmitting the first linearly polarized light (S state) and absorbing the second linearly polarized light (P state). When the first linearly polarized light (S state) passes through the first quarter-wave plate 51, it is converted into the first circularly polarized light. After being reflected by the first right-angle surface 301, the first circularly polarized light becomes the second circularly polarized light with the rotation direction opposite to that of the first circularly polarized light. After passing through the first quarter-wave plate 51 again, the second circularly polarized light is converted into the second linearly polarized light (P state). Due to the presence of the first polarizer 52, the second linearly polarized light (P state) is absorbed and cannot enter the polarization beam splitting assembly 40. Similarly, the first linearly polarized light (S state) will not enter the polarization beam splitting assembly 40 after being reflected by the second right-angle surface 302. In this way, the ghost image can be blocked from reaching the display chip 11, and thus the ghost image is eliminated. Even if there is the second linearly polarized light (P state) that is not intercepted and enters the polarization beam splitting assembly 40, it will directly pass through the beam splitting surface and be absorbed by the second polarizer 13 at the entrance surface 403, and will not reach the display chip 11, which further eliminates the ghost image.

[0060] Optionally, in an embodiment provided in the present application, in order to facilitate the assembly of the light engine module and improve the assembly accuracy, the first quarter-wave plate 51 is glued to the first polarizer 52. Preassembling the first quarter-wave plate 51 and the first polarizer 52 can improve the quality and assembly efficiency of the product during batch production.

[0061] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 the structure schematic diagram of the light engine module provided in the second embodiment of the present application is shown in FIG. 2, Figure 6 the structure schematic diagram of the light engine module provided in the third embodiment of the present application is shown in FIG. 3. Optionally, in order to reduce the redundant reflected light between the turning lens and the conversion film layer 50, in an embodiment provided in the present application, one side of the conversion film layer 50 is attached to the turning prism 30 or the polarization beam splitting assembly 40. In order to further reduce the influence of the reflected light, an AR film is coated on the contact surface between the conversion film layer 50 and the air. Specifically, as shown in FIG. 1, in the first embodiment, the first polarizer 52 is attached to the exit surface 402. The AR film is located on the side of the first quarter-wave plate 51 away from the first polarizer 52, which can ensure that the light will not be reflected at the exit surface 402 of the polarization beam splitting assembly 40; as shown in FIG. 2, in the second embodiment, the first polarizer 52 is attached to the entrance surface 401. The AR film is located on the side of the first quarter-wave plate 51 away from the first polarizer 52, which can ensure that the light will not be reflected at the entrance surface 401 of the polarization beam splitting assembly 40; as shown in FIG. 3, in the third embodiment, the first polarizer 52 is attached to the first right-angle surface 301. The AR film is located on the side of the first quarter-wave plate 51 away from the first polarizer 52, which can ensure that the light will not be reflected at the first right-angle surface 301 of the polarization beam splitting assembly 40. Figure 3 Figure 5 ​As shown, in the third embodiment, the first quarter wave plate 51 is attached to the first right angle surface 301 of the turning prism 30, and the AR film is located on the side of the first polarizer 52 away from the first quarter wave plate 51. Optionally, in order to further reduce the excess reflected light inside the optical module, the first imaging lens 21 has a bonding surface that is adapted to the shape of the exit surface 402. Specifically, as Figure 5 As shown, when the conversion film layer 50 is located between the first imaging lens 21 and the first right-angle surface 301, the bonding surface of the first imaging lens 21 is bonded to the exit surface 402; Figure 4 As shown, when the conversion film layer 50 is located between the first imaging lens 21 and the exit surface 402, the bonding surface of the first imaging lens 21 is bonded to the first quarter-wave plate 51. It can be understood that in this embodiment, the AR film can also be coated on the side of the first imaging lens 21 away from the first quarter-wave plate 51.

[0062] See also Figures 4 to 6 Optionally, in the embodiment provided in the present application, the imaging component 20 further includes a third imaging lens 23 located between the display surface 401 and the display component 10, which can further reduce the length of the entire optical module.

[0063] It is worth noting that in the above embodiment, the turning prism 30 of the present application adopts the shape of a right-angle prism. In other embodiments, in order to adapt to the optical performance and ID requirements of various AR glasses, the shape of the turning prism 30 can also be adaptively adjusted, as long as it can achieve light deflection and light path folding. In addition, the turning prism 30 can also be rotated 90° to flexibly change the direction of the output light, thereby adapting to the ID (industrial design) of AR glasses.

[0064] Optionally, in the embodiment provided in the present application, the polarization splitting component 40 is a PBS splitting prism, which is composed of a first right-angle prism body 41 and a second right-angle prism body 42 glued to an inclined surface, and the inclined surface of the right-angle prism is adhered to a polarization splitting element 43 to form a splitting surface. The polarization splitting element 43 can be but is not limited to being coated with a traditional PBS medium splitting film, a line grating splitting film, or a polarization splitting film (3M).

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. Optical machine module, characterized in that: include: a display assembly for providing polarized image light; an imaging component for projecting the polarized image light; a turning prism, located in the projection light path of the imaging assembly and used to change the direction of the polarized image light; a polarization beam splitting component having a display surface corresponding to the display component and an exit surface corresponding to the imaging component, the polarization beam splitting component being used to transmit the polarized image light to the imaging component for projecting an image; and The conversion film layer includes a first polarizer located between the turning prism and the exit surface and a first quarter-wave plate located between the turning prism and the first polarizer; the angle between the fast axis of the first quarter-wave plate and the transmission axis of the first polarizer is 45° or 135°; the first polarizer is used to transmit a first linearly polarized light and absorb a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light.

2. The optical machine module according to claim 1, wherein: The first quarter-wave plate is glued to the first polarizer.

3. The optical machine module according to claim 2, wherein: The first polarizer is attached to the exit surface, and the conversion film layer further comprises an AR film attached to a side of the first quarter wave plate facing away from the first polarizer; or The first quarter-wave plate is attached to the turning prism, and the conversion film layer further includes an AR film attached to a side of the first polarizer facing away from the first quarter-wave plate.

4. The optical machine module according to claim 1, wherein: The polarization splitting component further comprises a splitting surface for reflecting the first linear polarized light and transmitting the second linear polarized light, and an incident surface adjacent to the display surface and opposite to the exit surface; The display assembly includes a display chip located on the display surface, an illumination module located on the incident surface, and a second polarizer located between the illumination module and the incident surface. The second polarizer is used to transmit the first linearly polarized light and absorb the second linearly polarized light.

5. The optical machine module according to claim 4, wherein: The polarization beam splitting component includes a first right-angle prism body providing the display surface and the incident surface, a second right-angle prism body providing the exit surface, and a polarization beam splitting element providing the beam splitting surface. The first right-angle prism body and the second right-angle prism body are glued to the polarization beam splitting element.

6. The optical machine module according to claim 1, wherein: The turning prism is a right-angle prism and has a first right-angle surface corresponding to the exit surface and a second right-angle surface perpendicular to the first right-angle surface.

7. The optical machine module according to any one of claims 2 to 6, wherein: The polarization beam splitting component further comprises a reflecting surface adjacent to the emitting surface and opposite to the display surface; The imaging assembly includes a first imaging lens located on the exit surface, a second imaging lens located on the reflection surface, and a second quarter-wave plate located between the reflection surface and the second imaging lens.

8. The optical machine module according to claim 7, wherein: The imaging assembly further includes a third imaging lens located between the display surface and the display assembly.

9. The optical machine module according to claim 7, wherein: The first imaging lens is located between the conversion film layer and the exit surface and adheres to the exit surface; or The first imaging lens is located between the conversion film layer and the turning prism and adhered to the first quarter-wave plate.

10. AR glasses, characterized in that: include: Binocular waveguide; and The optical machine module according to any one of claims 1 to 9, wherein the turning prism of the optical machine module is correspondingly arranged on the light incident surface of the binocular waveguide.

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