Optical waveguide assembly, near-eye display device and intelligent glasses

Abstract

The utility model discloses an optical waveguide assembly, a near-to-eye display device and intelligent glasses, the optical waveguide assembly comprises a waveguide substrate, the waveguide substrate comprises a first surface and a second surface which are oppositely arranged, and parallel light entering the waveguide substrate is transmitted between the first surface and the second surface in a total reflection manner; the grating array is arranged in the waveguide substrate, the grating array comprises at least two gratings, the at least two gratings are parallelly arranged in the waveguide substrate at intervals in the first direction to form the grating array, and the gratings are obliquely arranged between the first surface and the second surface; wherein the grating array is configured to perform pupil expansion on parallel light rays transmitted in the waveguide substrate along a first direction, couple the parallel light rays out of the waveguide substrate, and convert the parallel light rays into divergent light rays or convergent light rays at the same time. According to the optical waveguide assembly provided by the utility model, the use burden of a myopia or hyperopia user can be reduced, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of augmented reality technology, especially to a light waveguide assembly, a near-eye display device and intelligent glasses. BACKGROUND

[0002] Augmented reality (AR) technology is a technology of superimposing a real environment and a virtual object in the same picture or space. In order to realize the function of augmented reality, researchers have proposed various schemes, such as Birdbath, prism, free-form surface, light waveguide, etc., among which, the light waveguide technology has excellent display performance.

[0003] However, the light waveguide itself can be equivalent to a parallel flat plate, and in actual use, it needs to meet the parallel light incidence, parallel light transmission and parallel light coupling out, so for nearsighted or farsighted users, when observing the infinite remote image coupled out of the waveguide, they still need to wear nearsighted or farsighted glasses. In this case, whether from the overall structure or the viewing effect, it will cause the decline of user experience. SUMMARY

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. For this purpose, the utility model provides a light waveguide assembly, which can enable nearsighted or farsighted users to see clear images without wearing nearsighted or farsighted glasses, reducing the use burden of nearsighted or farsighted users and improving the user experience.

[0005] The utility model also provides a near-eye display device with the above light waveguide assembly.

[0006] The utility model also provides intelligent glasses with the above near-eye display device.

[0007] According to the light waveguide assembly of the utility model, the light waveguide assembly comprises:

[0008] A waveguide substrate comprising a first surface and a second surface arranged oppositely, parallel light entering the waveguide substrate is totally reflected and transmitted between the first surface and the second surface;

[0009] A grating array arranged in the waveguide substrate, the grating array comprises at least two gratings, the at least two gratings are arranged in parallel and spaced apart in the waveguide substrate along a first direction to form the grating array, and the gratings are arranged obliquely between the first surface and the second surface;

[0010] The grating array is configured to expand pupils and couple out the parallel light rays transmitted in the waveguide substrate along a first direction while converting the parallel light rays into divergent light rays or convergent light rays.

[0011] In some embodiments, the grating is a volume holographic grating.

[0012] In some alternative embodiments, the light waveguide assembly further comprises a coupling-in element for coupling the parallel light rays into the waveguide substrate for total reflection transmission in the waveguide substrate.

[0013] In some alternative embodiments, the coupling-in element is a triangular prism which is attached to the waveguide substrate.

[0014] In some alternative embodiments, the reflectivity of at least two gratings gradually increases from a direction close to the coupling-in element to a direction away from the coupling-in element.

[0015] In some alternative embodiments, the light waveguide assembly further comprises a turning and expanding element which is arranged in the waveguide substrate for expanding pupils of the parallel light rays in the waveguide substrate along a second direction and turning the parallel light rays to be transmitted to the grating array, wherein the first direction is perpendicular to the second direction.

[0016] In some alternative embodiments, the turning and expanding element is a plurality of beam splitters which are arranged in the waveguide substrate in parallel and at an angle to the second direction.

[0017] In some alternative embodiments, the reflectivity of the plurality of beam splitters gradually increases from a direction close to the coupling-in element to a direction away from the coupling-in element.

[0018] According to the light waveguide assembly of the present application, by arranging the grating array in the waveguide substrate, the grating array comprises at least two gratings which are arranged in the waveguide substrate in parallel along a first direction, on the one hand, the grating array can expand pupils of the parallel light rays in the waveguide substrate along the first direction and couple out the parallel light rays from the waveguide substrate to be emitted to the human eye, on the other hand, since the grating reflects the parallel light rays while diffracting the light rays, the light rays reflected out of the waveguide substrate are converted into divergent light rays or convergent light rays, so that myopic users or hyperopic users can see clear images without wearing myopic or hyperopic glasses, reducing the use burden of myopic or hyperopic users and improving the use experience of users.

[0019] According to the near-eye display device of the second aspect of the present application, the image source is used for emitting parallel light rays.

[0020] According to the optical waveguide assembly of the first aspect of the present application, parallel light emitted by the image source enters the optical waveguide assembly and is transmitted by total reflection in the optical waveguide assembly and then emitted from the optical waveguide assembly to enter the human eye.

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

[0022] According to the intelligent glasses of the third aspect of the present application, the intelligent glasses comprise a frame and the near-eye display device of the second aspect of the present application mounted on the frame.

[0023] According to the intelligent glasses of the present application, the near-eye display device of the second aspect is provided, thereby improving the overall performance of the intelligent glasses.

[0024] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a front view of the optical waveguide assembly according to an embodiment of the present application;

[0026] Figure 2 is a right view of the optical waveguide assembly according to an embodiment of the present application;

[0027] Figure 3 is a top view of the optical waveguide assembly according to an embodiment of the present application;

[0028] Figure 4 is an enlarged view of a in the present application Figure 2

[0029] Figure 5 is an optical path schematic diagram of the optical waveguide assembly according to an embodiment of the present application;

[0030] Figure 6 is an exposure principle diagram of the volume holographic grating according to an embodiment of the present application.

[0031] REFERENCE NUMERALS:

[0032] 100: optical waveguide assembly; 10: waveguide substrate; 11: first surface; 12: second surface; 20: grating array; 21: grating; 30: turning pupil expanding element; 31: beam splitter; 40: coupling-in element;

[0033] 201: first collimating lens; 202: diopter lens; 203: volume holographic grating substrate; 204: second collimating lens; 1: human eye; 2: retina.​ DETAILED DESCRIPTION

[0034] Embodiments of the present application will be described in detail below with reference to the drawings, examples of which are shown in the drawings, wherein the same or similar notations 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.

[0035] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplicity, the description below of the specific examples refers only to the described embodiments. Naturally, the described embodiments are by no means limited to these examples, and the purpose of the disclosure is not to limit the present application. Furthermore, the present application can refer to different examples using the same or similar reference numerals and / or letters. Such repetition is for the purpose of simplicity and clarity and does not indicate a relationship between the various embodiments and / or arrangements discussed. Furthermore, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0036] Reference will now be made to Figures 1-6 The optical waveguide assembly 100 according to the embodiments of the present application is described below, which comprises a waveguide substrate 10 and a grating array 20, wherein the waveguide substrate 10 is used to transmit the parallel light rays incident to the waveguide substrate 10 by total reflection, and it can be understood that the waveguide substrate 10 can be a transparent glass material or a transparent resin material. The glass material has good optical performance and can ensure high transmittance, and the resin material has small mass and is easy to process, and the waveguide substrate 10 can be obtained by thermoplastic forming.

[0037] As shown in Figures 1-3 Further, the waveguide substrate 10 comprises a first surface 11 and a second surface 12 arranged oppositely, and the parallel light rays entering the waveguide substrate 10 are transmitted by total reflection between the first surface 11 and the second surface 12. It can be understood that the waveguide substrate 10 comprises a coupling-in end and a coupling-out end arranged oppositely, the parallel light rays enter the waveguide substrate 10 from the coupling-in end and are transmitted by total reflection between the first surface 11 and the second surface 12 of the waveguide substrate 10, and then exit the waveguide substrate 10 from the coupling-out end; the first surface 11 and the second surface 12 can be parallel or substantially parallel, so that the parallel light rays can be transmitted by total reflection between the first surface 11 and the second surface 12.

[0038] Please continue to refer to Figures 1-3 Further, the grating array 20 is arranged in the waveguide substrate 10, and the grating array 20 comprises at least two gratings 21, and the at least two gratings 21 are arranged along a first direction (such as Figure 1The grating array 20 is arranged in the waveguide substrate 10 in parallel and spaced apart along the first direction (e.g., the Y direction shown) to form a grating array 20, and the gratings 21 are arranged obliquely between the first surface 11 and the second surface 12, wherein the grating array 20 is configured to expand and couple out the parallel light rays transmitted in the waveguide substrate 10 along the first direction (e.g., the Y direction shown) while converting the parallel light rays into divergent light rays or convergent light rays. Figure 1 The grating array 20 is arranged in the waveguide substrate 10 in parallel and spaced apart along the first direction (e.g., the Y direction shown) to form a grating array 20, and the gratings 21 are arranged obliquely between the first surface 11 and the second surface 12, wherein the grating array 20 is configured to expand and couple out the parallel light rays transmitted in the waveguide substrate 10 along the first direction (e.g., the Y direction shown) while converting the parallel light rays into divergent light rays or convergent light rays.

[0039] It can be understood that the grating array 20 can be arranged at the coupling-out end of the waveguide substrate 10, and the gratings 21 can be arranged obliquely with the first surface 11 and the second surface 12, when the parallel light rays transmitted by total reflection in the waveguide substrate 10 are transmitted to the grating array 20, a part of the parallel light rays is reflected by the gratings 21, so that the total reflection condition of the waveguide substrate 10 is no longer met, and the parallel light rays are emitted from the waveguide substrate 10 to the human eye 1, and another part of the parallel light rays continues to be totally reflected and transmitted through the gratings 21, and since the grating array 20 includes at least two gratings 21, when the part of the parallel light rays transmitted through the gratings 21 continues to be transmitted to the next grating 21, the grating 21 again causes a part of the parallel light rays to be reflected and emitted from the waveguide substrate 10, and another part of the parallel light rays continues to be totally reflected and transmitted through the gratings 21, so that the parallel light rays transmitted in the waveguide substrate 10 are expanded and coupled out to the substrate along the first direction.

[0040] Please refer to Figures 1-5 In some other embodiments, the grating array 20 can include two gratings 21, three gratings 21, four gratings 21, five gratings 21, six gratings 21, etc., and the plurality of gratings 21 are arranged in parallel and spaced apart along the first direction in the waveguide substrate 10, wherein the spacing between the adjacent two gratings 21 can be the same or different, and the embodiments of the present application do not limit this. Thus, as shown in Figure 5 When only one grating 21 is arranged, at this time the human eye 1 can only see the image coupled out from the light waveguide assembly 100 at one position, and when the grating 21 is arranged with at least two, the image coupled out from the light waveguide assembly 100 can be seen at multiple positions, thereby realizing pupil expansion.

[0041] It should be noted that the grating array 20 not only reflects the parallel light rays, but also diffracts the light rays, so that the light rays reflected out of the waveguide substrate 10 can be converted into divergent light rays or convergent light rays. Specifically, for example, for myopic users, the grating array 20 can be arranged to convert the light rays reflected out of the waveguide substrate 10 into divergent light rays, and for hyperopic users, the grating array 20 can be arranged to convert the light rays reflected out of the waveguide substrate 10 into convergent light rays, so that the light rays emitted from the waveguide substrate 10 can be imaged on the retina 2 of the human eye 1 to generate a clear image.

[0042] The inventors find in actual research that when AR glasses applying AR technology are used, if a user is a myopic or hypermetropic person, the user needs to wear myopic or hypermetropic glasses again to better see the picture displayed by the AR glasses. When the AR glasses are worn again with the myopic or hypermetropic glasses, the user has a large use burden and a poor use experience.

[0043] Therefore, the light waveguide assembly 100 according to the embodiment of the present application is provided with the grating array 20 in the waveguide substrate 10, the grating array 20 includes at least two gratings 21, and the gratings 21 are arranged in parallel and at intervals in the waveguide substrate 10 along the first direction. On the one hand, the grating array 20 can expand the pupils of the parallel light in the waveguide substrate 10 along the first direction and couple out from the waveguide substrate 10 to be emitted to the human eye 1. On the other hand, since the grating 21 reflects the parallel light and also diffracts the light at the same time, the light reflected out of the waveguide substrate 10 is converted into divergent light or convergent light. Therefore, the myopic or hypermetropic user can see a clear image without wearing myopic or hypermetropic glasses, the use burden of the myopic or hypermetropic user is reduced, and the use experience of the user is improved.

[0044] Specifically, taking the user as a myopic user as an example, as shown in Figure 5 , when the light beam emitted from the light waveguide assembly 100 is a parallel light beam (as shown by the dotted line in Figure 5 ), the parallel light beam can only be imaged in front of the retina 2 after entering the human eye 1, so that the myopic user cannot see a clear image. When the light emitted from the light waveguide assembly 100 is divergent light (as shown by the solid line in Figure 5 ), the divergent light can be imaged on the retina 2 after entering the human eye 1, so that the myopic user can observe a clear image.

[0045] In some embodiments, the grating 21 is a volume holographic grating. By setting the grating 21 as a volume holographic grating and arranging a plurality of volume holographic gratings in the waveguide substrate 10 in parallel and at intervals along the first direction, the sensitivity of the volume holographic grating to the wavelength can be greatly reduced, so that almost colorless image transmission can be realized. At the same time, since the volume holographic grating has angle selectivity, the generation of ghost light can be greatly reduced, and the image quality of the light waveguide assembly 100 is further improved.

[0046] In order to facilitate understanding, Figure 6 the exposure principle diagram of the volume holographic grating is given. Specifically, for example, when the grating array 20 is configured to convert the light reflected out of the waveguide substrate 10 into divergent light, the exposure principle diagram of the volume holographic grating is as shown in Figure 6As shown, the signal light is collimated into parallel light after the first collimating lens 201, and becomes divergent light after the refractive power lens 202 and is incident on the volume holographic grating substrate 203. Meanwhile, the reference light is collimated into parallel light after collimated by the second collimating lens 204 and is incident on the volume holographic grating substrate 203. The signal light and the reference light interfere on the volume holographic grating substrate 203 to form interference fringes. After the volume holographic grating substrate 203 is recorded, the volume holographic grating is formed. When parallel light is incident on the volume holographic grating, the reflected parallel light forms divergent light.

[0047] It should be noted that, in the preparation of the volume holographic grating, the signal light and the reference light can be incident on the volume holographic grating substrate 203 at an angle α. The volume holographic grating formed in this way can further reduce the sensitivity of the volume holographic grating to the wavelength when the volume holographic grating is arranged at an angle α with the first direction, thereby further improving the image quality of the optical waveguide assembly 100. The angle α can be 15°, 30°, 45°, 60°, 75°, etc., and the embodiments of the present application do not limit this.

[0048] Please continue to refer to Figures 1-6 In some optional embodiments, the coupling-in element 40 can be arranged at the coupling-in end of the waveguide substrate 10, and the coupling-in element 40 is configured to couple the parallel light into the waveguide substrate 10 for total reflection transmission in the waveguide substrate 10. Specifically, the coupling-in element 40 can be a mirror, a prism, a diffraction grating, etc., and the embodiments of the present application do not limit this. In this way, the parallel light can be coupled into the waveguide substrate 10 for total reflection transmission in the waveguide substrate 10 by arranging the coupling-in element 40.

[0049] Please continue to refer to Figures 1-6 In some optional embodiments, the coupling-in element 40 is a triangular prism, which is arranged on the surface of the waveguide substrate 10. It can be understood that the triangular prism can be arranged on the first surface 11 of the waveguide substrate 10 or on the second surface 12, and the embodiments of the present application do not limit this. The triangular prism has a simple structure, thereby simplifying the structure of the optical waveguide assembly 100 and reducing the manufacturing process difficulty of the optical waveguide assembly 100.

[0050] Please continue to refer to Figures 1-6 In some optional embodiments, the reflectivity of the at least two gratings 21 gradually increases from the direction close to the coupling-in element 40 to the direction away from the coupling-in element 40. In this way, the uniformity of the image presented by the emergent light in the optical waveguide assembly 100 can be improved, and the imaging quality of the optical waveguide assembly 100 is further improved, and the user experience is further improved.

[0051] It can be understood that the parallel light rays in the waveguide substrate 10 are transmitted along the direction close to the coupling-in element 40 to the direction away from the coupling-in element 40, and therefore, the intensity of the parallel light rays incident to the grating 21 close to the coupling-in element 40 is higher, and after the grating 21 reflects a part of the parallel light rays out of the waveguide substrate 10, the remaining parallel light rays continue to be transmitted in the waveguide substrate 10 and are incident to the grating 21 away from the coupling-in element 40, at this time, the intensity of the parallel light rays is reduced, and therefore, the reflectivity of the grating 21 close to the coupling-in element 40 needs to be increased to reduce the intensity difference between the light rays reflected by the grating 21 away from the coupling-in element 40 and the light rays reflected by the grating 21 close to the coupling-in element 40, so as to improve the uniformity of the image presented by the outgoing light rays in the optical waveguide assembly 100, further improve the imaging quality of the optical waveguide assembly 100, and further improve the user experience.

[0052] Please continue to refer to Figures 1-6 In some optional embodiments, a turning and pupil expanding element 30 is further included, which is arranged in the waveguide substrate 10 and is used for expanding the parallel light rays in the waveguide substrate 10 along a second direction (such as the X direction shown in the figure) and transmitting the parallel light rays to the grating array 20 in a turning manner, wherein the first direction is perpendicular to the second direction. Figure 1

[0053] It should be noted that the parallel light rays enter the waveguide substrate 10 through the coupling-in element 40 and are totally reflected and transmitted in the waveguide substrate 10, when the parallel light rays are transmitted to the turning and pupil expanding element 30, the turning and pupil expanding element 30 expands the parallel light rays along the second direction and turns the parallel light rays, so that the parallel light rays are transmitted to the grating array 20, when the parallel light rays are transmitted to the grating array 20, the grating array 20 expands the parallel light rays along the first direction and couples the parallel light rays out of the waveguide substrate 10, and at the same time, converts the parallel light rays into divergent light rays or convergent light rays.

[0054] Therefore, by arranging the turning and pupil expanding element 30, the optical waveguide assembly 100 can expand the parallel light rays in two directions, so as to further improve the user experience. It can be understood that the first direction and the second direction can be perpendicular, and of course, in some other embodiments, the included angle between the first direction and the second direction can also be 15°, 30°, 45°, 60°, 75°, etc., as long as the turning and pupil expanding element 30 and the grating array 20 can expand the parallel light rays in two different directions.

[0055] Please continue to refer to Figures 1-6 In some optional embodiments, the turning and pupil expanding element 30 is a plurality of beam splitters 31, which are arranged in the waveguide substrate 10 in parallel and at intervals along the second direction, and the plurality of beam splitters 31 are arranged at an included angle with the second direction.

[0056] ​Specifically, when the parallel light is incident to the beam splitter 31, part of the parallel light is reflected by the beam splitter 31 to the grating array 20, and the other part of the parallel light transmits through the beam splitter 31 and is transmitted to the next beam splitter 31, and the next beam splitter 31 again splits the part of the transmitted parallel light, so as to realize the pupil expansion of the parallel light in the second direction, and transmit the parallel light to the grating array 20.

[0057] Therefore, the beam splitter 31 is simple in structure and does not cause dispersion, so as to further improve the imaging quality of the optical waveguide assembly 100 and further improve the user experience.

[0058] Of course, in some other embodiments, the turning pupil expansion element 30 can also be an element such as a grating 21, and the embodiments of the present application do not limit this.

[0059] In some optional embodiments, the reflectivity of the plurality of beam splitters 31 gradually increases from the direction close to the coupling-in element 40 to the direction away from the coupling-in element 40. Therefore, the intensity difference between the light reflected by the beam splitter 31 away from the coupling-in element 40 and the light reflected by the beam splitter 31 close to the coupling-in element 40 can be reduced, so as to improve the uniformity of the image presented by the exiting light in the optical waveguide assembly 100, further improve the imaging quality of the optical waveguide assembly 100, and further improve the user experience. The setting and principle of the beam splitter 31 in the present embodiment are similar to the design of the grating 21 described above, and will not be described here.

[0060] In another embodiment of the present application, a near-eye display device is provided, which comprises an image source and the optical waveguide assembly 100 provided in the above embodiments, wherein the image source is used to emit parallel light; the parallel light emitted by the image source enters the optical waveguide assembly 100 and is transmitted by total reflection in the optical waveguide assembly 100, and then exits from the optical waveguide assembly 100 to enter the human eye 1.

[0061] Specifically, the image source can adopt a display module with a backlight unit such as an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode) or a Micro-LED, or a display module without a backlight unit such as an LCOS (Liquid Crystal on Silicon) or a DMD (Digital Micromirror Device), and the specific selection can be flexibly selected according to the use requirement. Further, the near-eye display device can further comprise an optical system, which can be used to collimate and correct the light emitted by the image source before the light is emitted to the optical waveguide assembly 100.

[0062] The working process of the near-eye display device provided in the embodiment of the utility model is as follows:

[0063] The image source emits image light, the light is collimated and corrected by the optical system, and then the parallel propagation image light is output, and then the parallel propagation image light enters the waveguide substrate 10 through the coupling-in element 40, when transmitted to the turning and pupil expanding element 30, the light is split and expanded by the turning and pupil expanding element 30, and then output to the grating array 20, and then the light is split and expanded by the grating array 20, and the parallel light is converted into divergent light or convergent light and then enters the eyes of the experimenter, and finally a virtual image is formed in the retina 2 of the human eye 1.

[0064] According to the near-eye display device of the utility model, the optical waveguide assembly 100 provided in the above embodiment is adopted, so that the myopic user or the hyperopic user can see clear images without wearing myopic or hyperopic glasses, the use burden of the myopic or hyperopic user is reduced, the use experience of the user is improved, and the overall performance of the near-eye display device is improved.

[0065] In another embodiment of the utility model, a kind of intelligent glasses is provided, and the intelligent glasses include frame and the above-mentioned near-eye display device installed in frame.

[0066] It can be understood that the frame can include a frame and a temple, wherein the optical waveguide assembly 100 can be disposed in the frame, and the image source can be disposed on the temple, specifically, the frame can be provided with two to match the left and right eyes of the user.

[0067] According to the intelligent glasses of the utility model, the near-eye display device provided in the above embodiment is adopted, so that the myopic user or the hyperopic user can see clear images without wearing myopic or hyperopic glasses, the use burden of the myopic or hyperopic user is reduced, the use experience of the user is improved, and the overall performance of the intelligent glasses is improved.

[0068] The other configurations and operations of the optical waveguide assembly 100, the near-eye display device and the intelligent glasses according to the embodiments of the utility model are known to those skilled in the art, and will not be described in detail here.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits 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 waveguide substrate comprising a first surface and a second surface arranged oppositely, parallel light rays entering the waveguide substrate being totally reflected between the first surface and the second surface; a grating array arranged in the waveguide substrate, the grating array comprising at least two gratings arranged in parallel in the waveguide substrate along a first direction to form the grating array, the gratings being arranged obliquely between the first surface and the second surface; wherein the grating array is configured to expand pupils of the parallel light rays transmitted in the waveguide substrate along the first direction and couple out of the waveguide substrate, while converting the parallel light rays into divergent light rays or convergent light rays.

2. The optical waveguide assembly of claim 1, wherein, The gratings are volume holographic gratings.

3. The optical waveguide assembly of claim 2, wherein, Further comprising a coupling-in element for coupling the parallel light rays into the waveguide substrate to be totally reflected in the waveguide substrate.

4. The optical waveguide assembly of claim 3, wherein, The coupling-in element is a triangular prism arranged on the waveguide substrate.

5. The optical waveguide assembly of claim 3, wherein, Reflectivity of the at least two gratings gradually increases from a direction close to the coupling-in element to a direction away from the coupling-in element.

6. The optical waveguide assembly of claim 3, wherein, Further comprising a turning and expanding element arranged in the waveguide substrate for expanding pupils of the parallel light rays in the waveguide substrate along a second direction and turning the parallel light rays to be transmitted to the grating array, wherein the first direction is perpendicular to the second direction.

7. The optical waveguide assembly of claim 6, wherein, The turning and expanding element is a plurality of beam splitters arranged in the waveguide substrate in parallel along the second direction, and the plurality of beam splitters are arranged at an angle with the second direction.

8. The optical waveguide assembly of claim 7, wherein, Reflectivity of the plurality of beam splitters gradually increases from the direction close to the coupling-in element to the direction away from the coupling-in element.

9. A near-eye display device, comprising: The near-eye display device comprises: an image source for emitting parallel light rays; the light waveguide assembly according to any one of claims 1-8, the parallel light rays emitted by the image source entering the light waveguide assembly and being totally reflected in the light waveguide assembly before being emitted from the light waveguide assembly to enter a human eye.

10. An intelligent eyewear, characterized in that, The smart glasses comprise a frame and the near-eye display device according to claim 9 mounted on the frame.

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