A near-eye display device

Abstract

This application discloses a near-eye display device, including a scanning unit and an eyeglass body. The eyeglass body includes a frame, temples, and a waveguide. The temples are connected to the frame, and the waveguide is disposed within the frame. At least two sets of scanning units are correspondingly arranged on the left and / or right sides of the eyeglass body, and at least two sets of scanning units are disposed on the same side of the temples or frame of the eyeglass body. The long axis of the scanning unit is approximately parallel to the extension direction of the connecting section of the temple, or the long axis of the scanning unit is approximately parallel to the edge of the frame where it is located. The image projected by each scanning unit is coupled into the coupling area of ​​the corresponding waveguide, and the images projected by at least two sets of scanning units in the display area of ​​the waveguide partially overlap. The near-eye display device provided by this application has a large field of view while maintaining a small overall size.

Description

Technical Field

[0001] This application relates to the field of scanning display technology, and more specifically to a near-eye display device. Background Technology

[0002] Scanning display imaging, as an emerging display technology, can be used in various application scenarios such as projection displays and near-eye displays. Augmented reality display devices with large field-of-view angles can enhance the immersive experience and provide more information to users. However, these devices often require higher resolution, which places higher demands on the size, optical efficiency, and cost of the optical engine module. Currently, to achieve a large field-of-view display, images projected from multiple optical engine modules are stitched together within a waveguide. However, due to the large stitching angle, a significant angle exists between the optical path output from the optical engine module and the normal vector of the waveguide. Rotating the optical engine module would inevitably increase the overall size of the display device.

[0003] Based on this, this specification provides a near-eye display device that can guarantee image display quality while having a small size. Utility Model Content

[0004] The purpose of this application is to provide a near-eye display device that has a large field of view and a small overall size.

[0005] This application provides a near-eye display device, including a scanning unit and an eyeglass body. The eyeglass body includes a frame, temples, and a waveguide. The temples are connected to the frame, and the waveguide is disposed within the frame. At least two sets of scanning units are correspondingly provided on the left and / or right sides of the eyeglass body. The at least two sets of scanning units are disposed on the same side of the temples or frame of the eyeglass body. The angle between the long axis of the scanning unit and the extension direction of the connecting section of the temple is not greater than 5°, or the angle between the long axis of the scanning unit and the edge of the frame is not greater than 5°. The image projected by each scanning unit is coupled into the coupling area of ​​the corresponding waveguide, and the images projected by the at least two sets of scanning units in the display area of ​​the waveguide partially overlap.

[0006] Optionally, in some embodiments, the scanning unit includes an optical fiber scanner, a lens, and a galvanometer; the scanning optical fiber of the optical fiber scanner vibrates along a first vibration direction under the drive of a driving signal and forms a linear scanning trajectory, which passes through the lens and enters the reflecting surface of the galvanometer. The galvanometer vibrates along a second vibration direction and forms an image under the action of the galvanometer, which enters the coupling region of the waveguide.

[0007] Optionally, in some embodiments, the at least two sets of scanning units are disposed on the connecting section of the temple; wherein, the at least two sets of scanning units are arranged side by side, and the angle between the major axis direction of the at least two sets of scanning units and the extension direction of the connecting section of the temple is not greater than 5°.

[0008] Optionally, in some embodiments, the at least two sets of scanning units are disposed on the frame, the at least two sets of scanning units are arranged side by side, and the angle between the major axis direction of the at least two sets of scanning units and the edge of the frame on which they are located is not greater than 5°.

[0009] Optionally, in some embodiments, the angle between the major axis of one of the at least two sets of scanning units and the lateral side frame of the frame in which it is located is no greater than 5°; the angle between the major axis of the other set of scanning units and the longitudinal side frame of the frame in which it is located is no greater than 5°.

[0010] Optionally, in some embodiments, the angle between the major axis direction of one of the at least two sets of scanning units and the extension direction of the connecting section of the temple is no greater than 5°; the angle between the major axis direction of the other set of scanning units and the frame of the frame in which it is located is no greater than 5°.

[0011] Optionally, in some embodiments, the scanning unit that is substantially parallel to the connecting section of the temple in the at least two sets of scanning units further includes an optical path deflection element, and the coupling region of the waveguide is located in the light output path of the galvanometer.

[0012] Optionally, in some embodiments, the scanning unit that is substantially parallel to the connecting section of the temple in the at least two sets of scanning units further includes a focalless optical system, the galvanometer is located in the light output path of the lens, the focalless optical system is located in the light output path of the galvanometer, and the coupling region of the waveguide is located in the light output path of the focalless optical system.

[0013] Optionally, in some embodiments, in the at least two sets of scanning units that are substantially parallel to the frame of the mirror in which they are located, the light-emitting surface of the lens is arranged opposite to the reflective surface of the galvanometer, and the light emitted from the light-emitting surface of the lens is reflected to the coupling region of the waveguide by the reflective surface of the galvanometer.

[0014] Optionally, in some embodiments, the linear scanning trajectory emitted by the fiber optic scanner and the lens is on the projection plane of the galvanometer and the angle between the galvanometer and the rotation axis of the galvanometer is no greater than 5 degrees.

[0015] The technical solutions adopted in this application can achieve the following technical effects: In the near-eye display device provided in this application, multiple scanning units are correspondingly arranged on one side of the temple or frame of the glasses body, and the long axis direction of the scanning unit is roughly parallel to the temple or frame where the scanning unit is located. The light emitted from each scanning unit is coupled into the waveguide through the coupling area corresponding to the scanning unit. The images projected by different scanning units are stitched together in the waveguide, thereby enabling the near-eye display device to have a large field of view, while ensuring that the overall size of the near-eye display device is small.

[0016] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the technical solutions of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures and / or processes particularly pointed out in the description, claims and drawings. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the optical-mechanical module provided according to an embodiment of this application;

[0019] Figure 2A This is a schematic diagram of the structure of the main body of the glasses according to an embodiment of this application;

[0020] Figure 2B This is a structural schematic diagram of the main body of the glasses provided according to an embodiment of this application from another perspective;

[0021] Figure 3A This is a central field of view map provided to the user by a near-eye display device in a wearing state, according to the embodiments of this application;

[0022] Figure 3B This is a central field-of-view diagram provided to the user from another perspective by a near-eye display device in a wearing state, according to an embodiment of this application.

[0023] Figure 4A This is a schematic diagram showing the distribution of the scanning units provided in the embodiments of this application in a near-eye display device;

[0024] Figure 4B This is a schematic diagram showing the distribution of the scanning units provided in the embodiments of this application in a near-eye display device;

[0025] Figure 5 This describes the projection effect of different scanning units presented in the same waveguide according to the embodiments of this application specification;

[0026] Figure 6 This is a schematic diagram showing the distribution of the scanning units on the temple according to an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of the distribution of the scanning units in the frame according to an embodiment of this application;

[0028] Figure 8A This is a schematic diagram of the optical path of an optomechanical module according to an embodiment of this application;

[0029] Figure 8B This is a schematic diagram of the optical path of an optomechanical module from another perspective, according to an embodiment of this application;

[0030] Figure 9A This is a schematic diagram of the optical path of another optomechanical module provided according to an embodiment of this application;

[0031] Figure 9B This is a schematic diagram of the optical path of another optomechanical module provided according to an embodiment of this application from another perspective;

[0032] Figure 10A This is a schematic diagram of the optical path of another optomechanical module provided according to an embodiment of this application;

[0033] Figure 10B This is a schematic diagram of the optical path of another optomechanical module provided according to an embodiment of this application from another perspective;

[0034] Figure 11 This is a schematic diagram of the structure of a scanning unit according to an embodiment of this application;

[0035] Figure 12 based on Figure 11 The projection effect diagram obtained by the scanning unit is shown below;

[0036] Figure 13 This is a schematic diagram of another scanning unit provided according to an embodiment of this application;

[0037] Figure 14 based on Figure 13 The projection effect diagram obtained by the scanning unit is shown below;

[0038] Figure 15 This is a schematic diagram of another scanning unit provided according to an embodiment of this application;

[0039] Figure 16 based on Figure 15 The projection effect diagram shown is obtained when the scanning unit is installed on the horizontal side frame of the mirror frame;

[0040] Figure 17 based on Figure 15The projection effect diagram shown is obtained when the scanning unit is installed on the longitudinal side frame of the mirror frame;

[0041] Figure 18 This is a schematic diagram of the structure of another scanning unit provided according to an embodiment of this application;

[0042] Figure 19 based on Figure 18 The projection effect diagram shown is obtained when the scanning unit is installed on the horizontal side frame of the mirror frame;

[0043] Figure 20 based on Figure 19 The projection effect diagram shown is obtained when the scanning unit is installed on the longitudinal side frame of the mirror frame. Detailed Implementation

[0044] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0045] For ease of description, the scanning unit and waveguide are collectively referred to as the optomechanical module in the embodiments of this specification. Figure 1 This is a schematic diagram of an optomechanical module provided in an embodiment of this application. Please refer to it. Figure 1 The optomechanical module 100 may include a scanning unit and a waveguide 14. The scanning unit includes a fiber optic scanner 11, a lens 12, and a galvanometer 13. The fiber optic scanner 13 mainly includes a fiber optic actuator 111 and a scanning fiber 112.

[0046] The fiber optic actuator 111 can be a piezoelectric actuator and can be placed inside a base. Typically, the scanning fiber 112 can be cantilevered and mounted on the surface of the fiber optic actuator 111. That is, the emitting end of the scanning fiber 112 is suspended outside the fiber optic actuator 111, while the input end can be coupled to the laser emitter to receive the laser beam. The driving circuit of the fiber optic actuator 111 provides the driving signal, enabling the fiber optic actuator 111 to vibrate at a set operating frequency, further driving the scanning fiber 112 in a plane (e.g., ...). Figure 1 Vibration scanning within the XY plane (as shown).

[0047] The scanning fiber 112, serving as a flexible transmission and mode-controlled laser transmission medium, typically employs a cantilever structure. One end of the scanning fiber 112 is fixed to the fiber actuator 111, while the other end serves as the light-emitting end for scanning. Its scanning mode can be achieved by controlling the vibration frequency and phase of the fiber actuator 111.

[0048] The laser beam projected by the scanning fiber 112 can always be monochromatic, achieving a monochromatic projected image. Alternatively, it can use time-division multiplexing to change the intensity and color of the laser beam projected by the scanning fiber at different times, based on the image information to be displayed, so that the laser beam projected by the scanning fiber 112 matches the laser color and intensity at a specific projection point at a certain moment. Another method for color projection is to use an RGB single-mode fiber, directly projecting the mixed beam at the RGB light source input for each pixel. However, after the beam exits at the output end of the scanning fiber 112, interference and divergence are inevitable, affecting image quality.

[0049] When the light beam is emitted from the output end of the scanning fiber 112, it is inevitably subject to interference. Therefore, in order to improve the imaging quality, an optical component, such as a lens 12, can be set in the optical path so that the light beam emitted from the output end of the scanning fiber 112 can be adjusted. At the same time, it is necessary to minimize the volume and size of the entire laser scanning device as much as possible without affecting the imaging quality, so as to meet the miniaturization requirements of the application products.

[0050] The galvanometer 13, as a key actuator for beam deflection, achieves two-dimensional spatial deflection of the laser beam by changing the angle of the reflecting mirror surface. It is classified into two types: single-axis (line scanning) and dual-axis (area scanning). When the beam emitted from the light-emitting surface of the lens 12 is reflected by the galvanometer, the optical path can be adjusted to form an image on the desired imaging surface. Specifically, based on the working principle of the galvanometer, it can be classified as a piezoelectric galvanometer, electromagnetic galvanometer, etc. The galvanometer includes a reflecting mirror; under external drive, the reflecting mirror can rotate around an axis, which is related to... Figure 1 The X-direction shown is parallel and vibrates back and forth at a set frequency. The mirror can be connected to the rotating shaft in different ways, for example, it can be placed in a frame with a rotating shaft and rotatably fitted onto a rotating shaft. The galvanometer and the fiber optic actuator 111 can share a unified external circuit, which provides different driving signals so that the two have different operating frequencies.

[0051] Continue to refer to Figure 1 The scanning fiber 112 of the fiber optic scanner 11 is driven by a driving signal along a first vibration direction (e.g., Figure 1 The X-axis (as shown) vibrates and forms a linear scanning trajectory, which, after passing through lens 12, enters the reflecting surface of galvanometer 13. Galvanometer 13 vibrates along the second vibration direction (e.g., Figure 1 The vibration (shown on the Y-axis) forms an image under the action of the galvanometer 13 and enters the coupling region 141 of the waveguide 14.

[0052] It should be noted that in the embodiments of this specification, the first vibration direction and the second vibration direction are not consistent with the display direction of a conventional scanning display system. (Refer to...) Figure 1Ideally, a three-dimensional XYZ coordinate system is established with any point of the fiber optic scanner or lens in the optomechanical module as the origin. One side of the galvanometer is parallel to the X-axis, so its vibration direction is consistent with the Y-axis. The scanning unit only needs to vibrate parallel to the X-axis. In this case, the direction perpendicular to the paper can be regarded as the first vibration direction (e.g., ...). Figure 1 The X-axis shown in the figure, the height direction of the fiber optic scanner and lens can be regarded as the second vibration direction (e.g., the X-axis). Figure 1 The Y-axis is shown in the diagram, and the Z-axis is the major axis of the fiber optic scanner and lens. Here, the major axis can be understood as the direction where the fiber optic scanner and lens have their maximum dimensions. To more clearly illustrate the relationship between the first vibration direction, the second vibration direction, the first display direction, and the second display direction, a three-dimensional xyz coordinate system is established with any point on the waveguide as the origin. Specifically, the length direction of the waveguide (perpendicular to the plane of the paper) is the x-axis, the height direction of the waveguide is the y-axis, and the thickness direction of the waveguide is the z-axis. (Continue referring to...) Figure 1 Here, the first display direction is the same as the first vibration direction, and the second display direction is the same as the second vibration direction.

[0053] However, in the design of near-eye display devices, to ensure wearing comfort and overall aesthetics, the lenses and temples are usually not perpendicular. The specific structural distribution of the lenses and temples within the main body of the glasses, as well as the exit angle of the field of view relative to the human eye, will be discussed below. Figures 2A to 3B For a detailed explanation of its related content, please refer to the following text. Figure 2A and Figure 2B And related content.

[0054] Figure 2A , Figure 2B , Figure 3A as well as Figure 3B This is a schematic diagram illustrating the positional distribution of the lenses relative to the temples in the main body of the eyeglasses provided in this application embodiment. For ease of understanding and description, this specification uses an example of a user wearing a near-eye display device as an example, such as... Figures 2A to 3B As shown, the user wearing the near-eye display device is in a standing posture (or at least an upright upper body) on a horizontal surface, with the glasses looking straight ahead. Here, "straight ahead" corresponds to... Figure 2A , Figure 2B , Figure 3A and Figure 3B The opposite direction of the Z1 axis shown is also called the perpendicular direction of eye contact; the user's upright direction (the direction perpendicular to the horizontal plane) corresponds to... Figure 2A , Figure 2B , Figure 3A and Figure 3B The Y1 axis direction shown (also known as the vertical direction); the direction to the right of the user's upright body and parallel to the horizontal plane corresponds to... Figure 2A , Figure 2B , Figure 3A and Figure 3B The X1 axis direction shown is also referred to as the horizontal direction. (See reference...) Figure 2A The lenses are primarily deflected relative to the X1 and Y1 axes. Specifically, the angle between the lenses and the X1 axis is α, and the angle between the lenses and the Y1 axis is β. The temples are primarily deflected relative to the Z1 axis, with an angle of γ. It should be noted that when the optical engine module shown in Figure 2 meets the user wearing conditions described herein... Figure 1 The X-axis, Y-axis, and Z-axis shown are respectively... Figures 2A to 3B The X1, Y1, and Z1 axes correspond to each other.

[0055] refer to Figure 3A and Figure 3B When a user wears a near-eye display device, the waveguide lens provides a display area, or central field of view, for the user's eyes. To ensure that this central field of view is compatible with the human eye, the exit angle of the central field of view relative to the human eye in the X1 axis direction is defined as θ. o And the exit angle of the central field of view relative to the human eye in the Y1 axis direction is For example. Based on Figure 3A and Figure 3B As can be seen, there is a certain angle between the central field-of-view fiber and the fiber scanner (long axis direction). Here, the waveguide mirror is regarded as a reflector, and the exit angle of the central field-of-view ray in the X1 axis direction can be calculated as θ. o The exit angles of the central field of view rays along the Y1 axis are as follows:

[0056] θ i =θ o +2α (1)

[0058]

[0059] Therefore, the incident light in the central field of view is neither perpendicular to nor parallel to the waveguide lens and the fiber scanner. Conventional adjustments can be made by rotating the optical engine module and shifting the image source. However, the fiber scanner and lens have a certain length, so rotating the optical engine module would inevitably increase the overall size of the near-eye display device, significantly compromising its aesthetics and wearability. Furthermore, the image source, i.e., the object plane, is not a conventional plane, and shifting it would inevitably lead to a decrease in image quality. Based on this problem, this application provides a near-eye display device. For details regarding the near-eye display device, please refer to... Figures 4A to 20 And its related descriptions.

[0060] Figure 4A and Figure 4BThis is a schematic diagram of the structure of the near-eye display device provided in the embodiments of this application specification. For example... Figure 4A and Figure 4B As shown, in some embodiments, the near-eye display device includes a scanning unit and an eyeglass body. The eyeglass body includes a frame, temples, and a waveguide. The temples are connected to the frame, and the waveguide is disposed within the frame. Specifically, the frame includes a left frame 211 and a right frame 212, both of which may contain waveguide lenses. The temples include a left temple 221 and a right temple 222. The left temple 221 is connected to the left frame 211, and the right temple 222 is connected to the right frame 212. It should be noted that the connection between the temple 21 and the frame 22 can be a fixed connection, a hinge, or other similar methods.

[0061] In some embodiments, at least two sets of scanning units are provided on the left and / or right sides of the eyeglasses body, and the at least two sets of scanning units are located on the temple or frame of the same side of the eyeglasses body. Specifically, the left side of the eyeglasses body refers to the side where the left temple and left frame are located, and the right side of the eyeglasses body refers to the side where the right temple and right frame are located. Providing at least two sets of scanning units on the left and / or right sides of the eyeglasses body can include the following situations: at least two sets of scanning units are provided on one side of the eyeglasses body, or at least two sets of scanning units are provided on both sides of the eyeglasses body. The at least two sets of scanning units corresponding to one side of the eyeglasses body can be simultaneously located on that side of the temple, or simultaneously located on that side of the frame, or some scanning units can be located on that side of the temple, and other scanning units can be located on the frame. For details on the specific distribution of the scanning units, please refer to other descriptions in this application specification.

[0062] In some embodiments, the temple may include multiple parts. Taking the right temple as an example, the right temple 222 includes at least a connecting segment 2221 and a bending segment 2222. One end of the connecting segment 2221 is connected to the frame (right frame 212), and the other end of the connecting segment 2221 is connected to the bending segment 2222. In some embodiments, the connecting segment 2221 and the bending segment 2222 may be integrally formed structures. In some embodiments, the connecting segment 2221 and the bending segment 2222 may also be two independent parts, which may be fixedly connected or detachably connected. Further, the connecting segment 2221 and the bending segment 2222 may be made of the same material or different materials. In some embodiments, the connecting segment 2221 has a cavity (not shown) inside for carrying electronic components. In the embodiments described in this specification, the connecting segment 2221 can be used to carry the scanning unit. Furthermore, the connecting segment 2221 can also be used to carry the control buttons, sensors, camera, circuit structure, power supply, and other functional modules (such as Bluetooth modules, communication modules, etc.) of the near-eye display device. In other embodiments, the components disposed in the connecting segment 2221 can also be selectively disposed in the bending segment 2222. The bending segment 2222 is mainly for adapting to the human head and ears to ensure a comfortable wearing experience.

[0063] In some embodiments, the long axis of the scanning unit is approximately parallel to the extending direction of the connecting section of the temple, or the long axis of the scanning unit is approximately parallel to the frame of the mirror frame in which it is located. The image projected by each scanning unit is coupled into the coupling region of the corresponding waveguide, and the images projected by at least two sets of scanning units partially overlap in the display region of the waveguide. Specifically, refer to Figure 4A A set of scanning units 110A is disposed in the connecting section of the temple, in the direction of its long axis (e.g., Figure 4A The arrow m shown is perpendicular to the extension direction of the connecting segment 2221 (e.g., Figure 4A The arrow n) shown is approximately parallel. Another set of scanning units 110B is disposed on the frame (e.g., right frame 211), with its major axis direction approximately parallel to the edge of the right frame 212. It should be noted that, in the embodiments of this specification, "approximately parallel" means that the spatial angle between the two structures is no greater than 5°. For example, the fact that the major axis direction of the scanning unit is approximately parallel to the extension direction of the connecting segment can be understood as the angle between the major axis direction of the scanning unit and the extension direction of the connecting segment being no greater than 5°. Similarly, the fact that the major axis direction of the scanning unit is approximately parallel to the edge of the frame it is located in can be understood as the angle between the major axis direction of the scanning unit and the edge of the frame it is located in being no greater than 5°. Furthermore, Figure 4A and Figure 4B The scanning unit shown is for illustrative purposes only. In actual applications, the scanning unit can be placed inside the temple or frame of the glasses, or outside the temple or frame.

[0064] To describe the near-eye display device more clearly, we will use an example where two scanning units (a first scanning unit and a second scanning unit) are arranged on one side of the near-eye display device. Figure 5 Region 510 in the image is the projection image of the first scanning unit onto the waveguide. Figure 5 Region 520 is the projected image of the second scanning unit on the waveguide. Regions 510 and 520 overlap with region 530 to improve the field of view of the near-eye display device. The θ values ​​corresponding to the first and second scanning units are... o They are θ and -θ, respectively. All are equal to 0. The coupling angle of each scanning unit relative to the waveguide can be calculated based on the basic structural parameters of the glasses. Adjusting the angles of the optical elements allows for the adjustment of each scanning unit, achieving field-of-view stitching. In other embodiments, scanning units corresponding to each waveguide lens can be added according to the application scenario; for example, the number of scanning units can be 3, 4, 5, or more. Furthermore, the images projected by different scanning unit sheets within the waveguide are not limited to... Figure 5 The horizontal splicing shown can also be vertical splicing, or it can have both horizontal and vertical splicing at the same time.

[0065] In the near-eye display device provided in this specification, each waveguide corresponds to multiple scanning units. The images projected by the multiple scanning units partially overlap within the waveguide, giving the optomechanical module (scanning units and waveguides) of the near-eye display device a large field of view. Furthermore, by placing the scanning units within the temple or frame using the above-described scheme, the overall size of the near-eye display device can be reduced, resulting in a better wearing experience.

[0066] To more clearly illustrate the distribution of the scanning units on the main body of the glasses, this specification provides the following embodiments for detailed description.

[0067] In some embodiments, at least two sets of scanning units are disposed on the connecting section of the temple; wherein, the at least two sets of scanning units are arranged side by side, and the long axis direction of the at least two sets of scanning units is approximately parallel to the extension direction of the connecting section of the temple. The distribution of the two sets of scanning units on the connecting section of the temple will be described here. Figure 6 This is a schematic diagram showing the distribution of the scanning units on the temple according to an embodiment of this application. Figure 6 As shown in Figure (a), the connecting section of the temple is equipped with two sets of scanning units. Both sets of scanning units are housed within the internal cavity of the connecting section and are arranged side-by-side. The major axes of both sets of scanning units are approximately parallel to the extension direction of the connecting section. It should be noted that... Figure 6The distribution of the scanning units in the temple connection section shown in Figure (a) is merely an example; in other alternative embodiments, the scanning units may be distributed at other locations on the connection section. For example, Figure 6 As shown in sub-figure (b), in some embodiments, both sets of scanning units can be disposed on the sides of the temple. For example, Figure 6 As shown in sub-figure (c), one set of scanning units is disposed inside the temple, and another set of scanning units is disposed on the side of the temple. Furthermore, when the scanning units are disposed on the side of the temple, a structure for supporting the scanning units can be provided on the side of the temple, such as a shell structure protruding relative to the side of the temple. Additionally, when two sets of scanning units are disposed on the side of the temple, the two sets of scanning units can be located on the same side of the temple or on different sides of the temple.

[0068] It should be noted that the number of scanning units is not limited to the two groups mentioned above, but can also be three or more groups. The distribution of two or more groups of scanning units can refer to the scheme of the above embodiment, and will not be repeated here.

[0069] In some embodiments, at least two sets of scanning units are arranged side by side on the frame, and the major axis of each set of scanning units is approximately parallel to the edge of the frame. The distribution of the two sets of scanning units on the frame will be described here.

[0070] Figure 7 This is a schematic diagram showing the distribution of the scanning units in the frame according to an embodiment of this application. For example... Figure 7 As shown in (a), (b), (c), and (d), the frame is provided with two sets of scanning units, which are arranged side by side, and the long axis of both sets of scanning units is approximately parallel to the frame border. In some embodiments, the frame is a rectangular frame structure with horizontal and vertical side frames. The horizontal side frames include an upper side frame 213 and a lower side frame 214, which are positioned opposite each other. The vertical side frames include a left side frame 215 and a right side frame 216, which are positioned opposite each other. The side frames are joined together to form the frame.

[0071] like Figure 7 As shown in (a) and (b), in some embodiments, the two sets of scanning units can be located simultaneously in the same side frame of the frame, for example, the two sets of scanning units can be located simultaneously in the upper side frame 213 or the left side frame 215 of the frame. Alternatively, the two sets of scanning units can also be located simultaneously in either the lower side frame 214 or the right side frame 246 of the frame.

[0072] In some embodiments, the two sets of scanning units may also be located in different side frames of the frame. For example, as... Figure 7As shown in (c), in some embodiments, one set of the two sets of scanning units may be located in the upper frame 213 of the horizontal side frame, and the other set may be located in the lower frame 214 of the horizontal side frame. Alternatively, one set of the two sets of scanning units may be located in the left frame 215 of the horizontal side frame, and the other set may be located in the right frame 216 of the horizontal side frame.

[0073] like Figure 7 As shown in (d), in some embodiments, one set of the two sets of scanning units can be located on the horizontal side frame of the frame, and the other set can be located on the vertical side frame of the frame. The major axis of one set of scanning units is approximately parallel to the horizontal side frame where it is located; the major axis of the other set of scanning units is approximately parallel to the vertical side frame where it is located.

[0074] It should be noted that the number of scanning units is not limited to the two groups mentioned above, but can also be three or more groups. The distribution of two or more groups of scanning units can refer to the scheme of the above embodiment, and will not be repeated here.

[0075] In the embodiments described in this specification, the scanning unit is set in the frame, and the long axis of the scanning unit is roughly parallel to the frame, which makes the overall size of the frame relatively small, improving the convenience and wearing comfort of the near-eye display device.

[0076] The scanning units are not limited to the case where they are simultaneously located on the temple or frame in the above embodiments. In some embodiments, different scanning units can also be located on different parts of the eyeglass body. Specifically, one set of scanning units is located on the temple, and the other set is located on the frame. Further, the long axis of one set of scanning units is approximately parallel to the extension direction of the connecting section of the temple; the long axis of the other set of scanning units is approximately parallel to the edge of the frame where it is located. For details on the specific distribution of scanning units on the temple and frame, please refer to... Figure 6 and Figure 7 Regarding the related descriptions, it should be noted that the number of scanning units is not limited to the two groups mentioned above, but can also be three or more groups. The distribution of two or more groups of scanning units can refer to the scheme of the above embodiments, which will not be repeated here.

[0077] The above embodiments mentioned that the near-eye display device has scanning units set in different positions. However, in actual installation, due to differences in the position of the scanning unit relative to the waveguide and the structure of the frame and temple, the specific structure of the scanning unit in different positions also varies. To facilitate the description of the scanning units in different positions, the following description will combine the scanning unit and the waveguide.

[0078] When the scanning unit is located at the connecting section of the temple, the light emitted from the scanning unit needs to be coupled into the coupling region of the waveguide. Therefore, the exit pupil position of the scanning unit should be close to the coupling region of the waveguide. This is achieved by adding an optical path element (e.g., an optical path deflector or a focal-free optical system) between the scanning unit and the waveguide to adjust the exit pupil position. The following will combine... Figures 8A to 9B The relevant descriptions will be explained in detail.

[0079] Figure 8A and Figure 8B This is a schematic diagram of the optical path of an optomechanical module provided according to an embodiment of this application. (Reference) Figure 8A and Figure 8B The optomechanical module may include a scanning unit and a waveguide. The scanning unit includes a fiber scanner, a lens, and a galvanometer. The fiber scanner mainly includes a fiber actuator and a scanning fiber. One side of the galvanometer is approximately parallel to the plane of the waveguide. The projection area of ​​the galvanometer's reflecting surface onto the waveguide at least partially overlaps with the coupling region of the waveguide, so that the light reflected from the galvanometer's reflecting surface enters the coupling region of the waveguide. It should be noted that "approximately parallel to the plane of the waveguide" here can mean that the two are parallel, or that there is a small angle between them, such as an angle not greater than 5°. For ease of description and understanding, this specification uses the example of one side of the galvanometer being parallel to the plane of the waveguide.

[0080] Furthermore, an optical path deflection element can be provided between the lens and the waveguide of the optomechanical module. The optical path deflection element is located on the light-emitting path of the lens, and its reflecting surface is parallel to that of the galvanometer. The reflecting surface of the optical path deflection element is positioned opposite to the reflecting surface of the galvanometer, and the coupling region of the waveguide is located on the light-emitting path of the galvanometer. Further, the light emitted from the light-emitting surface of the lens enters the reflecting surface of the galvanometer under the action of the reflecting surface of the optical path deflection element. The reflecting surface of the galvanometer changes the light path, and simultaneously, the reflecting surface of the galvanometer vibrates along a second vibration direction. Under this action, the light forms a two-dimensional image, and the beam of the two-dimensional image couples into the coupling region of the waveguide. In some embodiments, the optical path deflection element can be an optical element such as a plane mirror or a prism. It should be noted that the above-described optical path deflection element is set independently of the lens. In some alternative embodiments, the optical path deflection element can also be integrated inside the lens; that is, the lens inside the lens that adjusts the light path can also be called an optical path deflection element.

[0081] Figure 9A and Figure 9B This is a schematic diagram of the optical path of an optomechanical module provided according to an embodiment of this application. (Reference) Figure 9A and Figure 9BA focalless optical system 16 can also be provided between the lens 12 and the waveguide 14 of the optomechanical module. A galvanometer 13 is located on the light-emitting path of the lens 12, and the focalless optical system 16 is located on the light-emitting path of the galvanometer 13. The coupling region 141 of the waveguide 14 is located on the light-emitting path of the focalless optical system 16. Further, the light emitted from the light-emitting surface of the lens 12 enters the focalless optical system 16 under the action of the reflecting surface of the galvanometer 13. The light-emitting end of the focalless optical system 16 couples the light into the coupling region 141 of the waveguide 14. In some embodiments, the focalless optical system 16 can be an equivalent negative refractive index or negative refractive index planar lens, which allows the light to converge again for imaging. In some embodiments, the focalless optical system 16 can also be a telescope system. By setting a focalless optical system between the galvanometer 13 and the waveguide 14, the exit pupil position of the optomechanical module can be adjusted so that the light spot emitted by the limiting scanning unit is located near the coupling region 141 of the waveguide 14, thereby improving the imaging quality.

[0082] When using Figure 9A and Figure 9B In the optical-mechanical module shown, the light emitted from the fiber scanner and lens passes through a galvanometer and then through a focal-free optical system before being coupled into the coupling region of the waveguide. In this optical-mechanical system, one side of the galvanometer does not need to be parallel to the waveguide.

[0083] Figure 10A and Figure 10B This is a schematic diagram showing the distribution of the scanning unit in the temple according to an embodiment of this application. Figure 10A and Figure 10B The optical engine module shown is the same as the one described above. Figure 8A and Figure 8B The overall structures of the optical-mechanical modules shown are roughly the same. The biggest difference is that the long axis of the scanning unit in the optical-mechanical module is roughly parallel to the frame of the lens. This can also be understood as the optical axis of the long axis unit being roughly parallel to the surface of the waveguide shown in the figure. Correspondingly, the reflecting surface of the galvanometer is on the light-emitting path of the lens, and the projection of the reflecting surface of galvanometer 13 onto the waveguide at least partially overlaps with the coupling region 141 of waveguide 14. Specifically, the scanning fiber of the fiber scanner, driven by the driving signal, moves along the first vibration direction (…). Figure 10A The light-emitting surface of the lens is directly projected onto the reflecting surface of the galvanometer 13 via the light-emitting surface of the lens (in the X2 axis direction shown in the image) and forms a linear scanning trajectory. The reflecting surface of the galvanometer 13 is along the second vibration direction (in the X2 axis direction shown in the image) to form a linear scanning trajectory. Figure 10A Vibration in the Y2 axis direction shown in the figure generates a two-dimensional image based on the light emitted from the light-emitting surface of the lens. The light beam of the two-dimensional image is coupled into the coupling region 141 of the waveguide 14.

[0084] It should be noted that when the scanning unit is mounted on the lens frame, an optical path element (such as a focal atomized optical system or an optical path deflection element) can also be placed between the scanning unit and the waveguide to match the light projected by the scanning unit with the coupling area of ​​the waveguide.

[0085] Continue to refer to Figure 4A and Figure 4B The scanning unit 110A on the temple emits light from the end facing the waveguide, and the scanning unit on the frame emits light from the side facing the waveguide, so as to ensure that the light emitted by the scanning unit at each position can be coupled into the coupling area of ​​the waveguide.

[0086] The image projected by the scanning unit will vary depending on its placement and the light-emitting side. The following will provide examples of images projected by different scanning unit configurations.

[0087] Figure 11 A schematic diagram of the scanning unit on the temple of the eyeglass provided in the embodiments of this application specification. Figure 12 Based on Figure 11 The projection effect image obtained from the scanning unit. For example... Figure 11 As shown, the scanning unit is mounted on the lens arm. The scanning unit on the lens arm emits light from the end facing the waveguide. The optical path deflection element and the galvanometer are located at the light-emitting end of the lens in the scanning unit. The reflective surface of the optical path deflection element is arranged opposite to the reflective surface of the galvanometer. The galvanometer can rotate around its rotation axis. Figure 11 The specific structure of the scanning unit shown is similar to Figure 8A and Figure 8B The scanning units shown are roughly the same, regarding Figure 11 For a detailed description of the scanning unit, please refer to [link / reference]. Figure 8A and Figure 8B And related content. Reference Figure 12 , Figure 12 The horizontal "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 12 The vertical “mirror” pattern shown is a display image of the galvanometer along its vibration direction (second vibration direction).

[0088] Figure 13 The scanning unit shown is equivalent to the one used during the installation process. Figure 11 Rotate 90° clockwise from the base, at this point Figure 14 The vertical "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 14 The horizontal "mirror" pattern shown is a display image of the galvanometer along its vibration direction (second vibration direction).

[0089] Figure 15This is a schematic diagram of a scanning unit on a frame according to an embodiment of this specification. Figure 16 and Figure 17 Based on Figure 15 The projection effect image obtained from the scanning unit. For example... Figure 15 As shown, the galvanometer is positioned at the light-emitting end of the lens in the scanning unit. Figure 15 The working principle of the scanning unit and waveguide shown can be found by referring to... Figure 10A and Figure 10B And related descriptions, will not be elaborated here. Furthermore, when Figure 15 When the scanning unit shown is located on the horizontal side frame of the frame (e.g., the upper or lower frame), the result is... Figure 16 The image shown illustrates the display effect. Figure 16 The vertical "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 16 The horizontal "mirror" pattern shown is the image displayed by the galvanometer along its vibration direction (second vibration direction). When Figure 15 When the scanning unit shown is located on the longitudinal side frame of the mirror frame (e.g., the left or right mirror frame), taking the scanning unit located on the left mirror frame as an example, we obtain... Figure 17 The image shown illustrates the display effect. Figure 17 The horizontal "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 17 The vertical “mirror” pattern shown is a display image of the galvanometer along its vibration direction (second vibration direction).

[0090] In other embodiments, the light emitted from the scanning unit located on the lens frame can be efficiently coupled into the coupling region of the waveguide. It can also be adjusted by setting an optical path deflection element, which is located on the light output path of the lens. The reflective surface of the optical path deflection element is opposite to the light output end of the lens. The galvanometer is located on the reflected light path of the optical path deflection element, and the reflective surface of the galvanometer is opposite to the reflective surface of the optical path deflection element. Figure 18 This is a schematic diagram of another scanning unit on a frame provided according to an embodiment of this specification. Figure 19 and Figure 20 Based on Figure 18 The projection effect image obtained from the scanning unit. For example... Figure 18 As shown, in addition to the galvanometer, the scanning unit is also equipped with an optical path deflection element.

[0091] Furthermore, when Figure 18 When the scanning unit shown is located on the horizontal side frame of the frame (e.g., the upper or lower frame), the result is... Figure 19 The image shown illustrates the display effect. Figure 19The horizontal "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 19 The horizontal "mirror" pattern shown is the image displayed by the galvanometer along its vibration direction (second vibration direction). When Figure 18 When the scanning unit shown is located on the longitudinal side frame of the mirror frame (e.g., the left or right mirror frame), taking the scanning unit located on the left mirror frame as an example, we obtain... Figure 20 The image shown illustrates the display effect. Figure 20 The vertical "FSD" pattern shown is a display image of the scanning direction (first vibration direction) of the fiber optic scanner. Figure 20 The horizontal "mirror" pattern shown is a display image of the galvanometer along its vibration direction (second vibration direction).

[0092] The above description is merely a preferred embodiment of this application. Each embodiment is only used to illustrate the technical solution of this application and is not intended to limit this application. Any technical solution that can be obtained by those skilled in the art through logical analysis, reasoning or effective experimentation based on the concept of this application should be within the scope of this application.

[0093] The various embodiments in this application are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0094] The terms "first," "second," "first," or "second" as used in the various embodiments of this disclosure may modify various components regardless of their order and / or importance, but these terms do not limit the corresponding components. The above terms are configured only for the purpose of distinguishing one component from another.

Claims

1. A near-eye display device, characterized in that, The near-eye display device includes a scanning unit and an eyeglass body. The eyeglass body includes a frame, temples, and a waveguide. The temples are connected to the frame, and the waveguides are disposed in the frame. At least two sets of scanning units are provided on the left and / or right sides of the eyeglass body. The at least two sets of scanning units are disposed on the temples or frames on the same side of the eyeglass body. Wherein, the angle between the long axis direction of the scanning unit and the extension direction of the connecting section of the temple is not greater than 5°, or the angle between the long axis direction of the scanning unit and the frame of the mirror frame is not greater than 5°, the image projected by each scanning unit is coupled into the coupling area of ​​the corresponding waveguide, and the images projected by the at least two sets of scanning units in the display area of ​​the waveguide partially overlap.

2. The near-eye display device according to claim 1, characterized in that, The scanning unit includes an optical fiber scanner, a lens, and a galvanometer; The scanning fiber of the fiber scanner vibrates along the first vibration direction under the drive signal and forms a linear scanning trajectory. After passing through the lens, it enters the reflecting surface of the galvanometer. The galvanometer vibrates along the second vibration direction and forms an image under the action of the galvanometer, which enters the coupling region of the waveguide.

3. The near-eye display device according to claim 2, characterized in that, The at least two sets of scanning units are disposed on the connecting section of the temple; wherein the at least two sets of scanning units are arranged side by side, and the angle between the major axis direction of the at least two sets of scanning units and the extension direction of the connecting section of the temple is not greater than 5°.

4. The near-eye display device according to claim 2, characterized in that, The at least two sets of scanning units are disposed on the frame, the at least two sets of scanning units are arranged side by side, and the angle between the major axis of the at least two sets of scanning units and the edge of the frame is not greater than 5°.

5. The near-eye display device according to claim 2, characterized in that, The angle between the major axis of one of the at least two sets of scanning units and the lateral side frame of the frame in which it is located is no greater than 5°; the angle between the major axis of the other set of scanning units and the longitudinal side frame of the frame in which it is located is no greater than 5°.

6. The near-eye display device according to claim 2, characterized in that, The angle between the major axis of one of the at least two sets of scanning units and the extension direction of the connecting section of the temple is no greater than 5°; the angle between the major axis of the other set of scanning units and the frame of the frame in which it is located is no greater than 5°.

7. The near-eye display device according to claim 3 or 6, characterized in that, The scanning unit, which is substantially parallel to the connecting section of the mirror temple among the at least two sets of scanning units, also includes an optical path deflection element, and the coupling region of the waveguide is located on the outgoing optical path of the galvanometer.

8. The near-eye display device according to claim 3 or 6, characterized in that, The scanning unit that is substantially parallel to the connecting section of the temple in the at least two sets of scanning units further includes a focalless optical system. The galvanometer is located in the light output path of the lens, the focalless optical system is located in the light output path of the galvanometer, and the coupling region of the waveguide is located in the light output path of the focalless optical system.

9. The near-eye display device according to any one of claims 4-6, characterized in that, In the at least two sets of scanning units, the scanning unit is approximately parallel to the frame of the mirror in which it is located. The light-emitting surface of the lens is arranged opposite to the reflective surface of the galvanometer. The light emitted from the light-emitting surface of the lens is reflected by the reflective surface of the galvanometer to the coupling region of the waveguide.

10. The near-eye display device according to claim 2, characterized in that, The linear scanning trajectory emitted by the fiber optic scanner and the lens is on the projection plane of the galvanometer and the angle between it and the rotation axis of the galvanometer is no greater than 5 degrees.

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