Optical waveguide component and near-eye display device

Abstract

The present invention discloses an optical waveguide component and a near-eye display device, wherein the optical waveguide component comprises: a waveguide substrate, the waveguide substrate comprises a first surface and a second surface arranged opposite to each other, and the two ends of the waveguide substrate are respectively a coupling end and a coupling end; an array beam splitter film, arranged in the waveguide substrate and located at the coupling end of the waveguide substrate; a first sawtooth structure, stacked on the first surface, the first sawtooth structure comprises a plurality of first teeth connected end to end, and the thickness of the first teeth gradually decreases from the coupling end to the coupling end; a second sawtooth structure, stacked on the second surface, the second sawtooth structure comprises a plurality of second teeth connected end to end, the second teeth are complementary to the first teeth and arranged correspondingly, and the thickness of the second teeth gradually increases from the coupling end to the coupling end. The present invention reduces the process difficulty of designing and producing the optical waveguide component and improves the imaging quality of the optical waveguide component.

Description

Technical Field

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

[0002] Augmented reality (AR) is a technology that superimposes virtual information onto the real world. It integrates virtual content with real scenes through display devices, showing not only real-world information but also virtual information at the same time. The two types of information complement and superimpose each other to form an immersive visual experience that combines the real and the virtual.

[0003] Figure 1 The array optical waveguide 10' shown is a widely used AR waveguide implementation method, see Figure 1 The array optical waveguide 10' is provided with a plurality of beam splitters 11', which can reflect a part of the incident light and transmit a part thereof. Taking the incident light a as an example, after entering the array optical waveguide 10', it is incident on the beam splitter 11' at a small angle α via the optical path b, wherein a part of the light is reflected to the human eye via the optical path c, and another part of the light is transmitted via the optical path d. The transmitted light continues to be transmitted forward and is incident on the beam splitter again at a large angle β', wherein a part of the light is transmitted via the optical path f and continues to propagate, and another part of the light is reflected via the optical path k to form a ghost image. Therefore, in order to reduce the ghost image light, the film layer of the beam splitter needs to be designed so that the reflectivity of the light incident on the beam splitter 11' at a large angle β' is as low as possible. Usually, this value is required to be controlled below 0.5%. However, due to process limitations, it is difficult to control the reflectivity to be very low for light incident at a large angle in actual coating, which increases the process difficulty of designing and producing the array optical waveguide. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an optical waveguide component, which can reduce the process difficulty of designing and producing the optical waveguide component and improve the imaging quality.

[0005] The present invention also provides a near-eye display device having the optical waveguide component.

[0006] According to the optical waveguide component of the first aspect of the present invention, the optical waveguide component comprises:

[0007] A waveguide substrate, the waveguide substrate comprising a first surface and a second surface arranged opposite to each other, two ends of the waveguide substrate being a coupling-in end and a coupling-out end respectively, light enters the waveguide substrate from the coupling-in end, is coupled out from the coupling-out end after being totally reflected and transmitted in the waveguide substrate, and is emitted from the second surface;

[0008] An array of splitter films, arranged in the waveguide substrate and located at the outcoupling end of the waveguide substrate, the array of splitter films being used to couple light out of the waveguide substrate;

[0009] A first sawtooth structure, stacked on the first surface, the first sawtooth structure comprising a plurality of first teeth connected end to end, the thickness of the first teeth gradually decreasing from the coupling end to the coupling end;

[0010] The second sawtooth structure is stacked on the second surface, and the second sawtooth structure includes a plurality of second tooth portions connected end to end. The second tooth portions are complementary to and corresponding to the first tooth portions, and the thickness of the second tooth portions gradually increases from the coupling end to the coupling end.

[0011] In some embodiments, the waveguide substrate, the first sawtooth structure and the second sawtooth structure are formed into one body through an integrated molding process.

[0012] In some embodiments, a coupling structure is further included, wherein the coupling structure is disposed at the coupling end and is used to couple light into the waveguide substrate.

[0013] In some embodiments, a first compensation member is further included. The first compensation member is disposed on a side of the second sawtooth structure away from the waveguide substrate. The first compensation member is used to adjust the deflection of the outcoupled light by the second sawtooth structure.

[0014] In some optional embodiments, the first compensation member includes a plurality of third teeth connected end to end, and the third teeth are complementary to and corresponding to the second teeth.

[0015] In some optional embodiments, the first compensation member is a wedge-shaped prism, the second tooth portion includes a second sawtooth surface, and the inclined surface of the wedge-shaped prism is parallel to the sawtooth surface.

[0016] In some optional embodiments, a second compensating member is further included, and the second compensating member is disposed on a side of the first sawtooth structure away from the waveguide substrate, and the second compensating member is used to adjust the angle of ambient light passing through the optical waveguide component.

[0017] In some optional embodiments, the second compensating member is complementary in shape to the first compensating member.

[0018] In some optional embodiments, there is a predetermined gap between the first compensating member and the second sawtooth structure, and there is also a predetermined gap between the second compensating member and the first sawtooth structure, so as to ensure that light is transmitted by total reflection in the waveguide substrate.

[0019] According to the optical waveguide component of the present invention, by stacking the first sawtooth structure on the first surface, the part of the light passing through the diaphragm can enter the first sawtooth structure and be reflected by the first sawtooth surface of the first tooth portion. Since the thickness of the first tooth portion gradually decreases in the direction from the coupling end to the coupling end, the part of the light is reflected by the first sawtooth surface of the first tooth portion and is emitted to the diaphragm again. At this time, the incident angle of the light to the diaphragm is small, which can effectively reduce the process difficulty of coating the array diaphragm with a high-transmittance film, reduce the process difficulty of designing and producing the optical waveguide component, so that the part of the light is almost completely transmitted from the diaphragm, reduce the generation of ghost light, and thus improve the imaging quality of the optical waveguide component. Furthermore, when this part of the light passes through the dichroic film again and is emitted toward the second surface, since the second sawtooth structure is arranged on the second surface of the waveguide substrate, this part of the light will pass through the second surface and enter the second sawtooth structure, and since the second tooth portion is complementary to the first tooth portion and is arranged correspondingly, this part of the light is reflected by the second sawtooth surface of the second tooth portion and is emitted toward the dichroic film again, so that the incident angle of this part of the light incident on the dichroic film is the same as the incident angle of the light incident on the dichroic film for the first time, thereby eliminating the influence of the first sawtooth structure on the imaging quality and further improving the imaging quality of the optical waveguide component.

[0020] According to the second aspect of the present invention, the near-eye display device comprises a projection component and an optical waveguide component according to the first aspect of the present invention, wherein the projection component is used to project light, and the optical waveguide component is used to receive the light projected by the projection component and transmit the light to the human eye.

[0021] According to the near-eye display device of the present invention, the optical waveguide assembly of the first aspect is provided, thereby improving the overall performance of the near-eye display device.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of an array optical waveguide structure in the prior art;

[0024] Figure 2 is a schematic diagram of an optical waveguide assembly according to one embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of an optical waveguide assembly according to yet another embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of an optical waveguide component according to yet another embodiment of the present invention.

[0027] Reference numerals:

[0028] 10: waveguide substrate; 11: first surface; 12: second surface; 13: coupling end; 14: coupling end; 20: array splitter film; 21: splitter film; 30: first sawtooth structure; 31: first tooth portion; 32: first sawtooth surface; 40: second sawtooth structure; 41: second tooth portion; 42: second sawtooth surface; 50: first compensation member; 51: inclined surface; 52: third tooth portion; 60: second compensation member; 61: fourth tooth portion; 70: predetermined gap;

[0029] 100: optical waveguide component;

[0030] 10': array optical waveguide; 11': beam splitter. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0033] Reference below Figure 2-Figure 4 The optical waveguide component 100 according to an embodiment of the present invention is described. The optical waveguide component 100 is a medium device that can guide light waves to propagate therein. The optical waveguide component 100 can guide the light projected by the projection component to the front of the eye, and superimpose a virtual image on the real image in front of the human eye, thereby realizing the function of augmented reality. The optical waveguide component 100 may include a waveguide substrate 10, an array splitter film 20, a first sawtooth structure 30 and a second sawtooth structure 40, wherein the array splitter film 20 is arranged in the waveguide substrate 10, and the waveguide substrate 10, the first sawtooth structure 30 and the second sawtooth structure 40 can be a transparent glass material or a transparent resin material. The glass material has better optical properties, for example, better transmission performance, and ensures the amount of light transmission; the resin material is easy to process, which simplifies the preparation process of the optical waveguide component 100.

[0034] Please refer to Figure 2Further, the waveguide substrate 10 includes a first surface 11 and a second surface 12 that are oppositely disposed, and two ends of the waveguide substrate 10 are a coupling end 13 and a coupling end 14, respectively. Light enters the waveguide substrate 10 from the coupling end 13, is coupled out from the coupling end 14 after being totally reflected and transmitted in the waveguide substrate 10, and is emitted from the second surface 12. It can be understood that the first surface 11 and the second surface 12 are parallel or substantially parallel.

[0035] Please continue to refer to Figure 2 Furthermore, the arrayed spectroscopic film 20 is disposed in the waveguide substrate 10 and is located at the coupling-out end 14 of the waveguide substrate 10. The arrayed spectroscopic film 20 is used to couple the light out of the waveguide substrate 10. It should be noted that the arrayed spectroscopic film 20 includes a plurality of spectroscopic films 21. The plurality of spectroscopic films 21 are arrayed and disposed in the waveguide substrate 10. The spacing between the plurality of spectroscopic films 21 may be equal or unequal, and the embodiment of the present invention does not limit this. The plurality of spectroscopic films 21 are not parallel to the first surface 11 and the second surface 12, so that when the light in the waveguide substrate 10 is directed toward the arrayed spectroscopic film 20, the arrayed spectroscopic film 20 can couple the light out of the waveguide substrate 10 to the human eye.

[0036] Please continue to refer to Figure 2 Furthermore, the first sawtooth structure 30 is stacked on the first surface 11, and the first sawtooth structure 30 includes a plurality of first tooth portions 31 connected end to end, and the thickness of the first tooth portions 31 gradually decreases in the direction from the coupling end 13 to the coupling end 14.

[0037] It should be noted that after the light A enters the waveguide substrate 10 from the coupling end 13, it is totally reflected and transmitted in the waveguide substrate 10. When it is transmitted to the array splitter film 20, a part of the light B is reflected by the splitter film 21 and coupled out from the waveguide substrate 10 to enter the human eye, and another part of the light C is transmitted by the splitter film 21 and continues to be transmitted forward. Since the first sawtooth structure 30 is stacked on the first surface 11, the transmitted light C can be transmitted through the first surface 11 of the waveguide substrate 10 into the first sawtooth structure 30, and is reflected by the first sawtooth surface 32 of the first tooth portion 31 to form a light D. D enters the waveguide substrate 10 again and is emitted toward the dichroic film 21 again. Since the thickness of the first tooth portion 31 gradually decreases from the coupling-in end 13 to the coupling-out end 14, compared with the light C being directly reflected by the first surface 11 and emitted toward the dichroic film 21 again, the light C is reflected by the first serrated surface 32 of the first tooth portion 31 to form the light D which is emitted toward the dichroic film 21 again. At this time, the incident angle β of the light D emitted toward the dichroic film 21 is smaller, thereby effectively reducing the process difficulty of coating the array dichroic film 20 with a high-transmittance film, so that the light D is almost completely transmitted from the dichroic film 21, reducing the generation of ghost light.

[0038] It can be understood that, compared with the light C being directly reflected by the first surface 11 and emitted toward the splitter film 21 again, the light C is reflected by the first sawtooth surface 32 of the first sawtooth structure 30 to form the light D, and is emitted toward the splitter film 21 again. After being transmitted again by the splitter film 21, the angle at which the light D is emitted toward the second surface 12 changes, thereby causing the angle at which the light D is reflected by the second surface 12 and emitted toward the splitter film 21 again to change, thereby affecting the imaging quality of the optical waveguide component 100.

[0039] Please continue to refer to Figure 2 Further, in the present embodiment, the second sawtooth structure 40 is stacked on the second surface 12, and the second sawtooth structure 40 includes a plurality of second teeth 41 connected end to end, and the second teeth 41 are complementary to and corresponding to the first teeth 31, and the thickness of the second teeth 41 gradually increases in the direction from the coupling end 13 to the coupling end 14. Therefore, when the light D passes through the beam splitter film 21 and is emitted to the second surface 12, since the second sawtooth structure 40 is disposed on the second surface 12 of the waveguide substrate 10, the light D will pass through the second surface 12 and enter the second sawtooth structure 40, and since the second teeth 41 are complementary to and corresponding to the first teeth 31, the light D is reflected by the second sawtooth surface 42 of the second teeth 41 to form a light E, and the light E is emitted to the beam splitter film 21 again, and at this time, the incident angle of the light E incident on the beam splitter film 21 is the same as the incident angle of the light A incident on the beam splitter film 21, thereby eliminating the influence of the first sawtooth structure 30 on the imaging quality.

[0040] The inventors found in actual research that when the light transmitted through the beam splitter enters the beam splitter again, due to the large incident angle, it is difficult to reduce the reflectivity of the beam splitter film, which increases the difficulty of designing and producing the array optical waveguide, produces ghost images, and affects the imaging quality of the array optical waveguide.

[0041] In view of this, according to the optical waveguide component 100 of the embodiment of the present invention, by stacking the first sawtooth structure 30 on the first surface 11, this part of the light passing through the splitter film 21 can enter the first sawtooth structure 30 and be reflected by the first sawtooth surface 32 of the first tooth portion 31. Since the thickness of the first tooth portion 31 gradually decreases in the direction from the coupling end 13 to the coupling end 14, this part of the light is reflected by the first sawtooth surface 32 of the first tooth portion 31 and is emitted toward the splitter film 21 again. At this time, the incident angle of the light to the splitter film 21 is small, thereby effectively reducing the process difficulty of coating the array splitter film 20 with a high-transmittance film, reducing the process difficulty of designing and producing the optical waveguide component 100, so that this part of the light is almost completely transmitted from the splitter film 21, reducing the generation of ghost light, and thus improving the imaging quality of the optical waveguide component 100. Furthermore, when this part of the light passes through the dichroic film 21 again and is emitted toward the second surface 12, since the second sawtooth structure 40 is arranged on the second surface 12 of the waveguide substrate 10, this part of the light will pass through the second surface 12 and enter the second sawtooth structure 40, and since the second tooth portion 41 and the first tooth portion 31 are complementary and correspondingly arranged, this part of the light is reflected by the second sawtooth surface 42 of the second tooth portion 41 and is emitted toward the dichroic film 21 again, so that the incident angle of this part of the light incident on the dichroic film 21 is the same as the incident angle of the light incident on the dichroic film 21 for the first time, thereby eliminating the influence of the first sawtooth structure 30 on the imaging quality, and further improving the imaging quality of the optical waveguide component 100.

[0042] It should be noted that the second tooth portion 41 is complementary to the first tooth portion 31 , which means that the first tooth portion 31 and the second tooth portion 41 can mesh with each other, so that the first sawtooth structure 30 and the second sawtooth structure 40 can be seamlessly spliced.

[0043] The first sawtooth structure 30 can completely cover the first surface 11 of the waveguide substrate 10, and the second sawtooth structure 40 can completely cover the second surface 12 of the waveguide substrate 10, so that the light can be transmitted by total reflection between the first sawtooth structure 30 and the second sawtooth structure 40. Alternatively, the first sawtooth structure 30 and the second sawtooth structure 40 are only arranged at the coupling-out end 14 of the waveguide substrate 10 and cover the array splitter film 20, so as to adjust the light at the coupling-out end 14.

[0044] Please refer to Figure 2-Figure 4In some embodiments, the waveguide substrate 10, the first sawtooth structure 30, and the second sawtooth structure 40 are formed into one body through an integrated molding process. Therefore, the optical waveguide component 100 is prepared through an integrated molding process, and the preparation process is simple, thereby further reducing the process difficulty of designing and producing the optical waveguide component 100. In addition, since the first sawtooth structure 30 and the second sawtooth structure 40 are both integrally formed on the waveguide substrate 10, the structure of the optical waveguide component 100 is more stable and reliable, thereby further ensuring the imaging quality of the optical waveguide component 100.

[0045] Specifically, the first sawtooth structure 30 can be directly formed on the first surface 11 of the waveguide substrate 10, and the second sawtooth structure 40 can be formed on the second surface 12 of the waveguide substrate 10 by thermoplastic molding or the like, or the first sawtooth structure 30 can be formed on the first surface 11 of the waveguide substrate 10, and the second sawtooth structure 40 can be formed on the second surface 12 of the waveguide substrate 10 by embossing. The embodiment of the present invention is not limited to this. The waveguide substrate 10, the first sawtooth structure 30 and the second sawtooth structure 40 may not be integrally formed. For example, the first sawtooth structure 30 and the second sawtooth structure 40 can be adhered to the waveguide substrate 10 by optical adhesive.

[0046] In some embodiments, a coupling structure (not shown) is further included, and the coupling structure is arranged at the coupling end 13, and is used to couple the light into the waveguide substrate 10. It can be understood that the coupling structure can be an optical element such as a prism or a grating, and the coupling structure can be glued to the waveguide substrate 10, or the coupling structure can be formed on the waveguide substrate 10 through an integrated molding process, and the embodiment of the present invention is not limited to this. Therefore, by setting the coupling structure, the light can be coupled into the waveguide substrate 10, and the coupling of the light is achieved through the prism or the grating, and the structure of the optical waveguide component 100 is simple, which further reduces the process difficulty of designing and producing the optical waveguide component 100.

[0047] Please refer to Figure 2-Figure 4 In some embodiments, a first compensating member 50 is further included. The first compensating member 50 is disposed on a side of the second sawtooth structure 40 away from the waveguide substrate 10 . The first compensating member 50 is used to adjust the deflection of the outcoupled light by the second sawtooth structure 40 .

[0048] It should be noted that after the light A enters the waveguide substrate 10 from the coupling-in end 13, it is transmitted by total reflection in the waveguide substrate 10. When it is transmitted to the array splitter film 20, a part of the light B is reflected by the splitter film 21 and coupled out from the waveguide substrate 10. Since the second sawtooth structure 40 is stacked on the second surface 12, when the light B is coupled out from the waveguide substrate 10, the light B needs to pass through the second sawtooth structure 40. The second sawtooth structure 40 will cause the angle of the coupled light B to be deflected, thereby affecting the imaging quality of the optical waveguide component 100.

[0049] Therefore, by providing the first compensation member 50 , the deflection of the outcoupled light by the second sawtooth structure 40 can be adjusted, thereby eliminating the deflection of the outcoupled light by the second sawtooth structure 40 , and further improving the imaging quality of the optical waveguide component 100 .

[0050] Please refer to Figure 2-Figure 4 In some optional embodiments, the first compensating member 50 includes a plurality of third tooth portions 52 connected end to end, and the third tooth portions 52 are complementary to and corresponding to the second tooth portions 41. It can be understood that the third tooth portions 52 and the second tooth portions 41 are complementary to each other, which means that the third tooth portions 52 and the second tooth portions 41 can mesh with each other, so that the second sawtooth structure 40 and the first compensating member 50 can be seamlessly spliced. Therefore, when the light is coupled out from the waveguide substrate 10, the light is deflected by passing through the second sawtooth structure 40, and then passes through the first compensating member 50 to eliminate the deflection, thereby further improving the imaging quality of the optical waveguide component 100.

[0051] It should be noted that the second tooth portion 41 is complementary to the first tooth portion 31 and is correspondingly arranged, and the third tooth portion 52 is complementary to the second tooth portion 41 and is correspondingly arranged, that is, the shape of the third tooth portion 52 and the first tooth portion 31 can be the same, therefore, the shape of the first compensation member 50 can be the same as the shape of the first serrated structure 30, thereby further simplifying the structure of the optical waveguide component 100 and reducing the process difficulty of designing and producing the optical waveguide component 100.

[0052] Please refer to Figure 2-Figure 4 In some optional embodiments, the first compensating member 50 is a wedge-shaped prism, the second tooth portion 41 includes a second sawtooth surface 42, the wedge-shaped prism has an inclined surface 51, and the inclined surface 51 of the wedge-shaped prism is parallel to the second sawtooth surface 42. It should be noted that when the angle γ between the second sawtooth surface 42 and the second surface 12 is small, the structure of the first compensating member 50 can be simplified to a wedge-shaped prism, thereby further simplifying the structure of the optical waveguide component 100 and reducing the process difficulty of designing and producing the optical waveguide component 100.

[0053] Please refer to Figure 2-Figure 4 In some optional embodiments, a second compensation member 60 is further included. The second compensation member 60 is disposed on a side of the first sawtooth structure 30 away from the waveguide substrate 10 . The second compensation member 60 is used to adjust the angle at which ambient light passes through the optical waveguide component 100 .

[0054] It should be noted that when the light from the external environment passes through the optical waveguide component 100 and enters the human eye, the light from the external environment needs to pass through the first sawtooth structure 30, the second sawtooth structure 40 and the first compensation component 50. Since the first compensation component 50 can eliminate the deflection of the light by the second sawtooth structure 40, the light from the external environment will still be deflected by the first sawtooth structure 30, ultimately affecting the user experience.

[0055] Therefore, by setting the second compensation member 60 on the side of the first sawtooth structure 30 away from the waveguide substrate 10, the second compensation member 60 can eliminate the deflection of the light by the first sawtooth structure 30, so that the angle of the light from the external environment does not change after passing through the optical waveguide component 100, thereby further improving the display effect of the optical waveguide component 100 and improving the user experience.

[0056] Please refer to Figure 2-Figure 4 In some optional embodiments, the second compensating member 60 is complementary to the first compensating member 50 in shape. It should be noted that the second compensating member 60 may include a plurality of fourth tooth portions 61 connected end to end, and the fourth tooth portions 61 are complementary to and corresponding to the first tooth portions 31, thereby eliminating the deflection of the light of the external environment by the first sawtooth structure 30. Since the second tooth portion 41 is also complementary to and corresponding to the first tooth portion 31, that is, the shape of the second compensating member 60 can be the same as the shape of the second sawtooth structure 40, and when the first compensating member 50 includes a plurality of third tooth portions 52 connected end to end, the shape of the first compensating member 50 can be the same as the shape of the first sawtooth structure 30, so the second compensating member 60 is complementary to the first compensating member 50 in shape, thereby further simplifying the structure of the optical waveguide component 100 and reducing the process difficulty of designing and producing the optical waveguide component 100.

[0057] Please refer to Figure 2-Figure 4 In some other embodiments, the second compensating member 60 may also be a wedge-shaped prism, and the first compensating member 50 may also be a wedge-shaped prism. In this case, the shapes of the two wedge-shaped prisms are also complementary, which can further simplify the structure of the optical waveguide component 100 and reduce the process difficulty of designing and producing the optical waveguide component 100.

[0058] Please refer to Figure 2-Figure 4 In some optional embodiments, there is a predetermined gap 70 between the first compensating member 50 and the second sawtooth structure 40, and there is also a predetermined gap 70 between the second compensating member 60 and the first sawtooth structure 30, so as to ensure that the light is fully reflected and transmitted in the waveguide substrate 10. It should be noted that the fully reflected transmission of light requires that the light is emitted from the optically dense medium to the optically sparse medium. When there is a predetermined gap 70 between the first compensating member 50 and the second sawtooth structure 40, and there is also a predetermined gap 70 between the second compensating member 60 and the first sawtooth structure 30, the transmission of light in the waveguide substrate 10 meets the condition of total reflection. When the first sawtooth structure 30 is stacked on the first surface 11 and the second sawtooth structure 40 is stacked on the second surface 12, the light can be fully reflected and transmitted between the first sawtooth structure 30 and the second sawtooth structure 40. In this way, the display effect of the optical waveguide component 100 can be further improved, and the user experience can be improved.

[0059] According to an embodiment of the present invention, a near-eye display device (not shown) includes a projection component (not shown) and the above-mentioned optical waveguide component 100, wherein the projection component is used to project light, and the optical waveguide component 100 is used to receive the light projected by the projection component and transmit the light to the human eye.

[0060] Please refer to Figure 2-Figure 4 Specifically, after the light A projected by the projection assembly enters the waveguide substrate 10 from the coupling end 13, it is totally reflected and transmitted in the waveguide substrate 10. When it is transmitted to the array splitter film 20, a part of the light B is reflected by the splitter film 21 and coupled out from the waveguide substrate 10 to enter the human eye, and another part of the light C is transmitted by the splitter film 21 and continues to be transmitted forward. Since the first sawtooth structure 30 is arranged at the coupling end 14 of the waveguide substrate 10 and is stacked on the first surface 11, the transmitted light C is transmitted through the first surface 11 of the waveguide substrate 10 into the first sawtooth structure 30, and is reflected by the first sawtooth surface 32 of the first tooth portion 31 to form a light D. The light D enters the waveguide substrate 10 again and is emitted to the splitter film again. 21. Since the thickness of the first tooth portion 31 gradually decreases from the coupling end 13 to the coupling end 14, compared with the light C being directly reflected by the first surface 11 and emitted toward the dichroic film 21 again, the light C is reflected by the first serrated surface 32 of the first tooth portion 31 to form the light D which is emitted toward the dichroic film 21 again. At this time, the incident angle β of the light D emitted toward the dichroic film 21 is smaller, thereby effectively reducing the process difficulty of coating the array dichroic film 20 with a high-transmittance film, so that the light D is almost completely transmitted from the dichroic film 21, reducing the generation of ghost light, and the second stack is arranged on the second surface 12, so as to adjust the angle of the light D emitted toward the dichroic film 21 again, so as to eliminate the deflection of the light D by the first serrated structure 30.

[0061] Furthermore, the light B is reflected by the beam splitter film 21 and coupled out from the waveguide substrate 10. Since the second sawtooth structure 40 is stacked on the second surface 12, when the light B is coupled out from the waveguide substrate 10, the light B needs to pass through the second sawtooth structure 40. The second sawtooth structure 40 will cause the angle of the coupled light B to be deflected. The first compensation member 50 is disposed on the side of the second sawtooth structure 40 away from the waveguide substrate 10, thereby eliminating the deflection of the coupled light B by the second sawtooth structure 40.

[0062] Furthermore, when the light from the external environment passes through the optical waveguide assembly 100 and enters the human eye, the light from the external environment needs to pass through the first sawtooth structure 30, the second sawtooth structure 40 and the first compensation member 50. Since the first compensation member 50 can eliminate the deflection of the light by the second sawtooth structure 40, the light from the external environment will still be deflected by the first sawtooth structure 30. The second compensation member 60 is disposed on the side of the first sawtooth structure 30 away from the waveguide substrate 10, so that the second compensation member 60 can eliminate the deflection of the light by the first sawtooth structure 30, so that the angle of the light from the external environment does not change after passing through the optical waveguide assembly 100, thereby further improving the display effect of the optical waveguide assembly 100, improving the user experience, and thus improving the overall performance of the near-eye display device.

[0063] Other structures and operations of the optical waveguide assembly 100 and the near-eye display device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0064] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical waveguide component, characterized in that: The optical waveguide assembly comprises: A waveguide substrate, the waveguide substrate comprising a first surface and a second surface arranged opposite to each other, two ends of the waveguide substrate being a coupling-in end and a coupling-out end respectively, light enters the waveguide substrate from the coupling-in end, is coupled out from the coupling-out end after being totally reflected and transmitted in the waveguide substrate, and is emitted from the second surface; An array of splitter films, arranged in the waveguide substrate and located at the outcoupling end of the waveguide substrate, the array of splitter films being used to couple light out of the waveguide substrate; A first sawtooth structure, stacked on the first surface, the first sawtooth structure comprising a plurality of first teeth connected end to end, the thickness of the first teeth gradually decreasing from the coupling end to the coupling end; The second sawtooth structure is stacked on the second surface, and the second sawtooth structure includes a plurality of second tooth portions connected end to end. The second tooth portions are complementary to and corresponding to the first tooth portions, and the thickness of the second tooth portions gradually increases from the coupling end to the coupling end.

2. The optical waveguide assembly according to claim 1, characterized in that The waveguide substrate, the first sawtooth structure and the second sawtooth structure are formed into one body through an integrated molding process.

3. The optical waveguide assembly according to claim 1, wherein: It also includes a coupling structure, which is arranged at the coupling end and is used to couple the light into the waveguide substrate.

4. The optical waveguide assembly according to claim 1, characterized in that It also includes a first compensating member, which is disposed on a side of the second sawtooth structure away from the waveguide substrate, and is used to adjust the deflection of the outcoupled light by the second sawtooth structure.

5. The optical waveguide assembly according to claim 4, characterized in that The first compensating member includes a plurality of third teeth connected end to end, and the third teeth are complementary to and corresponding to the second teeth.

6. The optical waveguide assembly according to claim 4, characterized in that The first compensation member is a wedge-shaped prism, the second tooth portion includes a second sawtooth surface, and the inclined surface of the wedge-shaped prism is parallel to the sawtooth surface.

7. The optical waveguide assembly according to claim 4, characterized in that It also includes a second compensating member, which is disposed on a side of the first sawtooth structure away from the waveguide substrate, and is used to adjust the angle at which ambient light passes through the optical waveguide component.

8. The optical waveguide assembly according to claim 7, characterized in that The second compensating member has a shape complementary to that of the first compensating member.

9. The optical waveguide assembly according to claim 7, characterized in that There is a predetermined gap between the first compensating member and the second sawtooth structure, and there is also a predetermined gap between the second compensating member and the first sawtooth structure, so as to ensure that the light is transmitted by total reflection in the waveguide substrate.

10. A near-eye display device, characterized in that: include: A projection component, wherein the projection component is used to project light; The optical waveguide assembly according to any one of claims 1 to 9, wherein the optical waveguide assembly is used to receive the light projected by the projection assembly and transmit the light to a human eye.

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