Optical waveguide assembly and near-eye display device
By designing a U-shaped optical waveguide component in AR devices, and utilizing optical path deflection and light-blocking elements, the observer concealment problem was solved, the concealment requirement of AR devices in security scenarios was met, and production costs were reduced.
Patent Information
- Application Number
- CN202520557407.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Existing AR devices allow observers to view real-world scenes through waveguides, but people in those scenes can also view the observers through the waveguides, failing to achieve observer concealment, which is particularly unacceptable in certain security scenarios.
Design an optical waveguide assembly that uses a first optical waveguide, a second optical waveguide, and a third optical waveguide to form a U-shaped structure. Place optical path deflection elements and light-blocking elements between the optical waveguides. After multiple reflections and deflections, light enters the human eye. At the same time, the light-blocking elements prevent light from the coupling side of the third optical waveguide from passing through the first optical waveguide, ensuring the observer's privacy.
This technology enables people in the real world to be unable to see the observer through the waveguide while the observer is viewing the real world through the waveguide, thus improving the concealment of AR devices and reducing production costs without adding extra equipment.
Smart Images
Figure CN223955838U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical technology field especially is related to a kind of optical waveguide assembly and near-eye display device. BACKGROUND
[0002] Augmented Reality (AR) technology is a kind of virtual information and real world cleverly fused technology, this kind of head-mounted display using augmented reality technology can let people view surrounding environment simultaneously, with virtual image projection to human eye. Among them, optical waveguide is the display scheme of more mainstream AR equipment, and many AR equipment are all this display scheme, virtual picture can be transmitted to human eye by optical waveguide total reflection, and real picture of outside is directly transmitted through optical waveguide into human eye, to realize the effect of augmented display.
[0003] However, when the observer wearing AR equipment looks at real picture of outside through optical waveguide, person in real picture can also look at observer through optical waveguide, and in certain situations, it can be needed to hide observer, for example, certain security scene etc., conventional AR equipment cannot be realized. UTILITY MODEL CONTENT
[0004] The utility model aims at at least one of the technical problems existing in prior art. For this purpose, the utility model provides an optical waveguide assembly, which can ensure the concealment of the observer.
[0005] The utility model further provides a near-eye display device with the above optical waveguide assembly.
[0006] According to the optical waveguide assembly of the first aspect of the utility model, the optical waveguide assembly includes a first optical waveguide, a second optical waveguide, a third optical waveguide and a light-blocking element, wherein:
[0007] The first optical waveguide is provided with a coupling-in element, so that light can enter the first optical waveguide through the coupling-in element;
[0008] The second optical waveguide is arranged at a first included angle with the first optical waveguide, and a first light path turning element is arranged between the second optical waveguide and the first optical waveguide, so that the light transmitted in the first optical waveguide enters the second optical waveguide for transmission after the first light path turning element;
[0009] The third optical waveguide is arranged at a second included angle with the second optical waveguide, and the third optical waveguide is arranged in parallel with the first optical waveguide. A second light path turning element is arranged between the third optical waveguide and the second optical waveguide, so that the light transmitted in the second optical waveguide enters the third optical waveguide after passing through the second light path turning element. A coupling-out element is arranged on the third optical waveguide, which is used to couple out the light in the third optical waveguide to enter the human eye.
[0010] The light blocking element is arranged between the first optical waveguide and the third optical waveguide, and is used to prevent the light on the coupling-out side of the third optical waveguide from being transmitted from the first optical waveguide.
[0011] In some embodiments, the second optical waveguide is arranged perpendicularly to the first optical waveguide, and the third optical waveguide is arranged perpendicularly to the second optical waveguide.
[0012] In some optional embodiments, the first light path turning element and the second light path turning element are both mirrors.
[0013] In some optional embodiments, the first light path turning element and the second light path turning element are both prisms.
[0014] In some optional embodiments, the first light path turning element and the second light path turning element are isosceles right triangular prisms with the same structure.
[0015] In some optional embodiments, the light blocking element is a light blocking plate arranged between the first optical waveguide and the third optical waveguide, which is used to absorb the light on the coupling-out side of the third optical waveguide that is directed to the light blocking plate.
[0016] In some optional embodiments, the light blocking element is a reflecting element, which is used to reflect the light on the coupling-out side of the third optical waveguide that is directed to the reflecting element.
[0017] In some embodiments, the coupling-in element can be an array mirror or a grating, and the coupling-out element can also be an array mirror or a grating.
[0018] In some embodiments, a cylindrical mirror is further included, which is arranged on the side of the third optical waveguide from which the light is coupled out, so that the coupled-out light enters the human eye after passing through the cylindrical mirror.
[0019] According to the optical waveguide assembly of the utility model, through setting first optical waveguide, second optical waveguide and third optical waveguide into the structure similar to U type, and setting first light path turning element between first optical waveguide and second optical waveguide, setting second light path turning element between second optical waveguide and third optical waveguide, so that the light in first optical waveguide can be transmitted to third optical waveguide through second optical waveguide, and is coupled out through the coupling-out element on third optical waveguide, and finally is shot to human eye, simultaneously, through setting light blocking element between first optical waveguide and third optical waveguide, so that the light on the coupling-out side of third optical waveguide can be prevented from transmitting through first optical waveguide, namely, the person in the real picture of outside world cannot observe observer through first optical waveguide, so as to improve the concealment of AR device to observer, simultaneously, the optical waveguide assembly does not need to increase other equipment, reduces production cost.
[0020] According to the near-eye display device of the second aspect of the utility model, comprising projection light machine and above-mentioned optical waveguide assembly, wherein:
[0021] The projection light machine is used for emitting light,
[0022] The optical waveguide assembly is used for receiving the light emitted by the projection light machine and transmitting the light to the human eye.
[0023] According to the near-eye display device of the utility model, by setting the optical waveguide assembly of the first aspect, the overall performance of the near-eye display device is improved.
[0024] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is the schematic diagram of optical waveguide assembly according to one embodiment of the utility model;
[0026] Figure 2 It is the schematic diagram of optical waveguide assembly according to another embodiment of the utility model;
[0027] Figure 3 It is the schematic diagram of optical waveguide assembly according to still another embodiment of the utility model.
[0028] REFERENCE NUMERALS:
[0029] 100: optical waveguide assembly;10: first optical waveguide;11: coupling-in element;20: second optical waveguide;30: third optical waveguide;31: coupling-out element;40: first light path turning element;50: second light path turning element;60: light blocking element;70: cylindrical mirror. DETAILED DESCRIPTION
[0030] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.
[0031] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can refer to the same reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the applicability of other processes and / or the use of other materials.
[0032] Reference will be made to Figures 1-3 The light waveguide assembly 100 according to the embodiment of the present application is described, the light waveguide is a medium device for guiding the propagation of light waves, the light waveguide can transmit the light rays entering the light waveguide therein by total reflection, and guide the light rays to the human eye, finally realize the display function, the light waveguide assembly 100 of the embodiment of the present application includes first light waveguide 10, second light waveguide 20, third light waveguide 30 and light blocking element 60.
[0033] It should be noted that the first light waveguide 10, the second light waveguide 20 and the third light waveguide 30 can be transparent glass material, or transparent resin material, the glass material has better optical properties, for example, better transmission performance, ensure the transmission quantity of light; resin material is easy to process, through thermoplastic forming process, etc. The first light waveguide 10, the second light waveguide 20 and the third light waveguide 30 can be obtained.
[0034] Please continue to refer to Figures 1-3 Further, the first light waveguide 10 is provided with a coupling-in element 11, so that the light rays can enter the first light waveguide 10 through the coupling-in element 11; it can be understood that the light rays of the real picture outside can enter the first light waveguide 10 through the coupling-in element 11, and transmit in the first light waveguide 10 by total reflection.
[0035] Please continue to refer to Figures 1-3Further, the second optical waveguide 20 is arranged at a first angle with the first optical waveguide 10, and a first light path turning element 40 is arranged between the second optical waveguide 20 and the first optical waveguide 10, so that the light transmitted in the first optical waveguide 10 enters the second optical waveguide 20 after the first light path turning element 40; it should be noted that the light transmitted by total reflection in the first optical waveguide 10, when transmitted to one end of the first optical waveguide 10, the light exits from the first optical waveguide 10 and is incident on the first light path turning element 40, after the first light path turning element 40, the light enters the second optical waveguide 20 and is totally reflected and transmitted in the second optical waveguide 20.
[0036] Please continue to refer to Figures 1-3 Further, the third optical waveguide 30 is arranged at a second angle with the second optical waveguide 20, and the third optical waveguide 30 is arranged parallel to the first optical waveguide 10, and a second light path turning element 50 is arranged between the third optical waveguide 30 and the second optical waveguide 20, so that the light transmitted in the second optical waveguide 20 enters the third optical waveguide 30 after the second light path turning element 50, and the third optical waveguide 30 is provided with a coupling-out element 31, which is used to couple the light in the third optical waveguide 30 out to enter the human eye; it can be understood that when the light transmitted by total reflection in the second optical waveguide 20 is transmitted to one end of the second optical waveguide 20, the light exits from the second optical waveguide 20 and is incident on the second light path turning element 50, after the second light path turning element 50, the light enters the third optical waveguide 30 and is totally reflected and transmitted in the third optical waveguide 30.
[0037] It can be understood that the first optical waveguide 10 is provided with a coupling-in element 11, the light of the real picture can enter the first optical waveguide 10 through the coupling-in element 11, and the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30 form a U-shaped structure, the first optical waveguide 10 and the second optical waveguide 20 are provided with a first light path turning element 40, so that the light in the first optical waveguide 10 can be turned into the second optical waveguide 20, the second optical waveguide 20 and the third optical waveguide 30 are provided with a second light path turning element 50, so that the light in the second optical waveguide 20 can be turned into the third optical waveguide 30, and the third optical waveguide 30 is provided with a coupling-out element 31, when the light in the third optical waveguide 30 is transmitted to the coupling-out element 31, the light is coupled out from the third optical waveguide 30 to the human eye.
[0038] It should be noted that since the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30 are all light-transmitting materials, when the user receives the light emitted from the third optical waveguide 30 on the side away from the first optical waveguide 10, the person in the external real picture can observe the observer through the first optical waveguide 10 and the third optical waveguide 30, so that the observer has poor concealment and cannot be used in some special scenes.
[0039] Please continue to refer to Figures 1-3 Further, the light blocking element 60 is arranged between the first light waveguide 10 and the third light waveguide 30, and is used to prevent the light on the coupling-out side of the third light waveguide 30 from being emitted from the first light waveguide 10. It can be understood that, when the light blocking element 60 is arranged between the first waveguide and the third waveguide, the light of the real scene outside can be transmitted into the eyes of the observer through the first light waveguide 10, the second light waveguide 20 and the third light waveguide 30, and the light on the side of the observer cannot be transmitted to the outside through the first light waveguide 10, thereby improving the concealment of the observer.
[0040] In some other embodiments, the light waveguide assembly 100 can also be without the light blocking element 60, specifically, for example, when it is needed to observe the scene on the other side of an opaque object from one side of the opaque object, at this time, the opaque object can play the role of the light blocking element 60, that is, the first light waveguide 10 and the third light waveguide 30 are respectively arranged on the opposite sides of the opaque object, so that the light of the real scene outside can be transmitted into the eyes of the observer through the first light waveguide 10, the second light waveguide 20 and the third light waveguide 30, and the light on the side of the observer cannot be transmitted to the outside through the first light waveguide 10. The opaque object can be a wall or the like, and the embodiments of the present application do not limit this.
[0041] The inventors have found in actual research that, when the observer wearing the AR device watches the real scene outside through the light waveguide, the person in the real scene can also watch the observer through the light waveguide in the existing AR device, and in some cases, it is needed to hide the observer, for example, in some security scenes, and the conventional AR device cannot achieve this, and the existing VR device can have a certain hiding effect on the observer, but if the real scene needs to be combined, an external device such as a camera needs to be used to collect the real scene and then sent to the eyes of the person, thereby increasing the production cost.
[0042] Therefore, the light waveguide assembly 100 in the embodiment of the present application sets the first light waveguide 10, the second light waveguide 20 and the third light waveguide 30 into a structure similar to a U-shaped structure, sets the first light path turning element 40 between the first light waveguide 10 and the second light waveguide 20, and sets the second light path turning element 50 between the second light waveguide 20 and the third light waveguide 30, so that the light in the first light waveguide 10 can be transmitted to the third light waveguide 30 through the second light waveguide 20, and is coupled out through the coupling-out element 31 on the third light waveguide 30 and finally shoots at the human eye; meanwhile, the light blocking element 60 is set between the first light waveguide 10 and the third light waveguide 30, so that the light on the coupling-out side of the third light waveguide 30 can be prevented from transmitting through the first light waveguide 10, that is, the person in the real scene outside cannot observe the observer through the first light waveguide 10, so that the concealment of the AR device to the observer is improved, and meanwhile, the light waveguide assembly 100 does not need to increase other devices, and the production cost is reduced.
[0043] Please continue to refer to Figures 1-3 In some embodiments, the second light waveguide 20 is vertically arranged with the first light waveguide 10, and the third light waveguide 30 is vertically arranged with the second light waveguide 20. That is, the first included angle is 90°, and the second included angle is also 90°, so that the structure of the light waveguide assembly 100 is more regular, thereby simplifying the production process of the light waveguide assembly 100 and further reducing the production cost of the light waveguide assembly 100.
[0044] In some other embodiments, the first included angle between the second light waveguide 20 and the first light waveguide 10 can also be arranged at other angles, for example, the first included angle between the second light waveguide 20 and the first light waveguide 10 is 30°, 45° or 60°, etc., and the embodiment of the present application does not limit this, and similarly, the second included angle between the third light waveguide 30 and the second light waveguide 20 can also be arranged at other angles, as long as the third light waveguide 30 is parallel to the first light waveguide 10.
[0045] In some optional embodiments, the first light path turning element 40 and the second light path turning element 50 are both mirrors. Therefore, the mirror has a simple structure and low manufacturing cost, thereby further reducing the production cost of the light waveguide assembly 100.
[0046] It should be noted that when the second optical waveguide 20 is arranged vertically with the first optical waveguide 10, and the third optical waveguide 30 is arranged vertically with the second optical waveguide 20, the mirror forming the first light path turning element 40 can be arranged at 45° with the first optical waveguide 10 and the second optical waveguide 20, so as to reflect the light emitted from the first optical waveguide 10 into the second optical waveguide 20, and similarly, the mirror forming the second light path turning element 50 can be arranged at 45° with the second optical waveguide 20 and the third optical waveguide 30, so as to reflect the light emitted from the second optical waveguide 20 into the third optical waveguide 30.
[0047] In some other embodiments, the first light path turning element 40 can be fixedly connected with the first optical waveguide 10 and the second optical waveguide 20 by optical glue, or the first light path turning element 40 can be fixedly connected with the first optical waveguide 10 and the second optical waveguide 20 by welding, and the embodiments of the utility model do not limit this, and similarly, the second light path turning element 50 can also be fixedly connected with the second optical waveguide 20 and the third optical waveguide 30 by bonding or welding, which will not be described here.
[0048] Please continue to refer to Figures 1-3 In some optional embodiments, the first light path turning element 40 and the second light path turning element 50 are both prisms. It can be understood that the prism is provided with a reflecting surface, and when the light is incident on the reflecting surface, the reflecting surface can turn the light. Specifically, a reflecting film can be coated on one surface of the prism to form a reflecting surface to turn the light, or the total reflection characteristic of the prism can be directly used to turn the light, and the embodiments of the utility model do not limit this.
[0049] Therefore, by setting the first light path turning element 40 and the second light path turning element 50 as prisms, the structure of the optical waveguide assembly 100 can be further simplified, the structural design of the product is further optimized, and the product cost is reduced.
[0050] Please continue to refer to Figures 1-3 In some optional embodiments, the first light path turning element 40 and the second light path turning element 50 are isosceles right triangular prisms with the same structure. It can be understood that the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30 can have the same thickness, and the length of the right angle side of the isosceles right triangular prism can be the same as the thickness of the first optical waveguide 10, so that the two right angle sides of the isosceles right triangular prism forming the first light path turning element 40 can be opposite to the first optical waveguide 10 and the second optical waveguide 20 respectively, and similarly, the two right angle sides of the isosceles right triangular prism forming the second light path turning element 50 can be opposite to the second optical waveguide 20 and the third optical waveguide 30 respectively. Therefore, the structure of the optical waveguide assembly 100 can be further simplified, the structural design of the product is further optimized, and the product cost is reduced.
[0051] Please continue to refer to Figures 1-3 In some optional embodiments, the light blocking element 60 is a light blocking plate arranged between the first optical waveguide 10 and the third optical waveguide 30, and the light blocking plate is used to absorb the light rays emitted by the third optical waveguide 30 and incident on the light blocking plate. Specifically, the light blocking plate can be made of a metal plate, a plastic plate, a wooden plate or the like, and the embodiments of the present application do not limit this. By coating the surface of the metal plate, the plastic plate or the wooden plate with a light-absorbing material, the light rays incident on the light blocking plate are absorbed by the light-absorbing material, thereby preventing the light rays from penetrating the first optical waveguide 10.
[0052] It should be noted that the light-absorbing material can be coated on the surface of the light blocking plate close to the first optical waveguide 10, or on the surface of the light blocking plate close to the third optical waveguide 30, or on both opposite surfaces of the light blocking plate, and the embodiments of the present application do not limit this.
[0053] Please continue to refer to Figures 1-3 In some optional embodiments, the light blocking element 60 is a reflecting element, and the reflecting element is used to reflect the light rays emitted by the third optical waveguide 30 and incident on the reflecting element. Similarly, the reflecting element can be made of a metal plate, a plastic plate, a wooden plate or the like, and the embodiments of the present application do not limit this. By providing a reflecting layer on the surface of the metal plate, the plastic plate or the wooden plate, the light rays incident on the reflecting element are reflected by the reflecting layer. Specifically, the reflecting layer can be a diffuse reflecting layer, thereby avoiding the interference of the light rays reflected by the reflecting element on the imaging quality of the optical waveguide assembly 100.
[0054] Please continue to refer to Figures 1-3 In some embodiments, the coupling-in element 11 can be an array mirror or a grating, and the coupling-out element 31 can also be an array mirror or a grating. Thus, by using the coupling-in element 11, the light rays of the real picture on the side of the first optical waveguide 10 can be coupled into the first optical waveguide 10, and at the same time, by using the coupling-out element 31, the light rays in the third optical waveguide 30 can be coupled out to enter the human eye, so that even if there is an obstruction of the light blocking element 60, the observer can still observe the real picture.
[0055] It can be understood that the coupling-in element 11 and the coupling-out element 31 can both be array mirrors or both be gratings, or one of the coupling-in element 11 and the coupling-out element 31 can be an array mirror, and the other one can be a grating, and the embodiments of the present application do not limit this.
[0056] Please continue to refer to Figures 1-3In some embodiments, the optical waveguide assembly 100 further comprises a cylindrical lens 70 arranged on the side of the third optical waveguide 30 from which the light is coupled out, so that the coupled-out light enters the human eye after passing through the cylindrical lens 70. It should be noted that the light of the external real scene may change after being transmitted through the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30, and finally the real scene exits from the third optical waveguide 30. Specifically, for example, the real scene finally exiting from the third optical waveguide 30 may be upside down to form an inverted image, and therefore, by arranging the cylindrical lens 70 on the side of the third optical waveguide 30 from which the light is coupled out, the light can be flipped upside down, and the final image is the same as the external real scene.
[0057] According to the near-eye display device of the second aspect of the present application, the projection light machine is used to emit light, and the optical waveguide assembly 100 is used to receive the light emitted by the projection light machine and transmit the light to the human eye.
[0058] It can be understood that the projection light machine can be arranged on the side of the first optical waveguide 10 from which the light is coupled in. After the projection light machine emits the light of the virtual image, the light can enter the first optical waveguide 10 through the coupling-in element 11 and be transmitted in the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30, and then be coupled out from the coupling-out element 31 to enter the human eye. At the same time, since the light of the real scene can also enter the first optical waveguide 10 through the coupling-in element 11 and be transmitted in the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30, and then be coupled out from the coupling-out element 31 to enter the human eye, the observer can observe both the real scene and the virtual scene on the side from which the light is coupled out, and finally realize virtual display of the real scene.
[0059] Further, since the light-blocking element 60 is arranged between the first optical waveguide 10 and the third optical waveguide 30, and the light of the external real scene can enter the observer's eye through the transmission of the first optical waveguide 10, the second optical waveguide 20 and the third optical waveguide 30, while the light on the observer's side cannot be transmitted to the outside through the first optical waveguide 10, thereby improving the concealment of the observer.
[0060] According to the near-eye display device of the embodiment of the present application, by arranging the optical waveguide assembly 100 of the first aspect, the overall performance of the near-eye display device is improved.
[0061] The other configurations and operations of the optical waveguide assembly 100 and the near-eye display device according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.
[0062] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0063] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0064] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0065] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0066] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without mutual contradiction.
[0067] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. An optical waveguide assembly, characterized by, The light waveguide assembly comprises a first light waveguide, a second light waveguide, a third light waveguide and a light blocking element, wherein: The first light waveguide is provided with a coupling-in element, so that light can enter the first light waveguide through the coupling-in element; The second light waveguide is arranged at a first included angle with the first light waveguide, and a first light path turning element is arranged between the second light waveguide and the first light waveguide, so that the light transmitted in the first light waveguide enters the second light waveguide after passing through the first light path turning element; The third light waveguide is arranged at a second included angle with the second light waveguide, and is arranged in parallel with the first light waveguide, and a second light path turning element is arranged between the third light waveguide and the second light waveguide, so that the light transmitted in the second light waveguide enters the third light waveguide after passing through the second light path turning element, and the third light waveguide is provided with a coupling-out element for coupling out the light in the third light waveguide to enter the human eye; The light blocking element is arranged between the first light waveguide and the third light waveguide, and is used to prevent the light on the coupling-out side of the third light waveguide from being transmitted from the first light waveguide.
2. The optical waveguide assembly of claim 1, wherein, The second light waveguide is arranged perpendicularly to the first light waveguide, and the third light waveguide is arranged perpendicularly to the second light waveguide.
3. The optical waveguide assembly of claim 2, wherein, The first light path turning element and the second light path turning element are both mirrors.
4. The optical waveguide assembly of claim 2, wherein, The first light path turning element and the second light path turning element are both prisms.
5. The optical waveguide assembly of claim 4, wherein, The first light path turning element and the second light path turning element are isosceles right triangular prisms with the same structure.
6. The optical waveguide assembly of claim 4, wherein, The light blocking element is a light blocking plate arranged between the first light waveguide and the third light waveguide, and the light blocking plate is used to absorb the light on the coupling-out side of the third light waveguide that is directed towards the light blocking plate.
7. The optical waveguide assembly of claim 4, wherein, The light blocking element is a reflecting element, which is used to reflect the light on the coupling-out side of the third light waveguide that is directed towards the reflecting element.
8. The optical waveguide assembly of claim 1, wherein, The coupling-in element is an array mirror or a grating, and the coupling-out element is an array mirror or a grating.
9. The optical waveguide assembly of claim 1, wherein, A cylindrical mirror is further included, which is arranged on the side of the third light waveguide from which the light is coupled out, so that the coupled-out light passes through the cylindrical mirror to enter the human eye.
10. A near-eye display device, comprising: A projection light machine and the light waveguide assembly according to any one of claims 1-9 are included, wherein: The projection light machine is used to emit light, The light waveguide assembly is used to receive the light emitted by the projection light machine and transmit the light to the human eye.