Display device and waveguide display device

Abstract

The application discloses a display device and a waveguide display device, and relates to the technical field of waveguide display. The display device comprises a main body, a first waveguide display and a second waveguide display. The distance between the first coupling-out grating of the first lens of the first waveguide display and the central axis of the first lens frame is not equal to the distance between the second coupling-out grating of the second lens of the second waveguide display and the central axis of the second lens. The first waveguide display and the second waveguide display can be alternatively mounted on the main body, so that the display device can adapt to people with different pupil distances. The display device can adapt to people with different pupil distances by alternatively mounting the first waveguide display and the second waveguide display corresponding to different effective pupil distance coverage ranges on the main body. Therefore, the eyebox of a single waveguide display can be reduced, and the rainbow stripes generated when the display device is used can be reduced.

Description

Technical Field

[0001] This application relates to the field of waveguide display technology, and in particular to a display device and waveguide display apparatus. Background Technology

[0002] An optical waveguide is a medium that guides light waves to propagate. It can be used to guide projection light to a display device, forming a virtual image in front of the viewer's eyes. AR glasses are one of the representative products of this technology. Optical waveguides can be divided into reflective array waveguides and diffractive waveguides. Diffractive waveguides can be further subdivided into surface relief gratings and volume holographic gratings. Surface relief gratings (SRGs) have the advantages of a large field of view and a large eye movement range, as well as the convenience of nanoimprinting. Moreover, lenses using surface relief waveguides are relatively thin, which helps to reduce the overall weight of diffractive waveguide products. Therefore, surface relief gratings are currently the most widely used solution in diffractive waveguide products on the market.

[0003] Because everyone's interpupillary distance (IPD) may differ, and individual eyeballs move and rotate, the relative position of the pupil to the lenses of diffractive waveguide products will also change. To ensure users can see the image in any eye position and to cover more users, a grating must be used to dilate the pupil in the image generated by the optical engine. This ensures that the image can be seen within a certain range when the pupil's position relative to the lens changes. The area comprising all positions of the image visible to the pupil is defined as the eyebox. Related display devices typically modulate the eyebox to a size that covers the interpupillary distance range of most people. However, this design can lead to significant rainbow patterns on the display during use, resulting in degraded image quality and a reduced user experience. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, in a first aspect, this application provides a display device, comprising:

[0005] The first waveguide display includes a first frame and two first lenses mounted on the first frame. Each first lens is provided with a first coupling grating and a first coupling grating. The distance between the first coupling grating and the central axis of the first frame is a first spacing.

[0006] The second waveguide display includes a second frame and two second lenses mounted on the second frame. Each second lens is provided with a second coupling grating and a second coupling grating. The distance between the second coupling grating and the central axis of the second frame is a second spacing. The second spacing is not equal to the first spacing.

[0007] The main body, the first waveguide display and the second waveguide display can be optionally mounted on the main body so that the display device can be adapted to people with different interpupillary distances.

[0008] Secondly, this application provides a waveguide display device, including a frame, two first lenses and two second lenses. Each first lens has a first coupling grating and a first coupling grating, and each second lens has a second coupling grating and a second coupling grating. The first and second lenses can be selectively mounted on the frame. When the first lens is mounted on the frame, the first coupling grating forms a first distance with the central axis of the frame. When the second lens is mounted on the frame, the second coupling grating forms a second distance with the central axis of the frame. The first distance and the second distance are not equal, so that the waveguide display device can adapt to people with different interpupillary distances.

[0009] Unlike existing technologies, the display device provided in this application can produce beneficial technical effects. Specifically, the distances between the coupling gratings of the first and second waveguide displays and the central axis of the frame are not equal. Therefore, corresponding to different effective interpupillary distance coverage ranges, the display device can accommodate people with different interpupillary distances by selectively mounting either the first or second waveguide display on the main body. Thus, the display device does not need to adjust the eye-friendly area of ​​a single waveguide display to a size that covers most people; instead, the eye-friendly area of ​​a single waveguide display can be reduced. Since the longer the eye-friendly area of ​​the waveguide display, the more pronounced the rainbow effect becomes, the above design can effectively reduce the rainbow effect generated by the display device during use, reduce the interference of the rainbow effect on the displayed image, and improve the user experience.

[0010] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a waveguide display of a display device provided in some embodiments of this application;

[0013] Figure 2 These are schematic diagrams of the lens structure provided in some embodiments of this application;

[0014] Figure 3 This is a schematic diagram of the projection principle of a waveguide display provided in some embodiments of this application;

[0015] Figure 4 These are schematic diagrams of the lens structure provided in some embodiments of this application;

[0016] Figure 5 This is a schematic diagram analyzing the eye-friendly zone length in a waveguide display;

[0017] Figure 6 These are schematic diagrams of the structure of a display device provided in some embodiments of this application;

[0018] Figure 7 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application;

[0019] Figure 8 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application;

[0020] Figure 9 yes Figure 8 The diagram shows a partial cross-sectional structure of the first and second waveguide displays.

[0021] Figure 10 These are schematic diagrams of the structure of a display device provided in some embodiments of this application;

[0022] Figure 11 This is a schematic diagram of the lens manufacturing process provided in some embodiments of this application;

[0023] Figure 12 This is a partial structural schematic diagram of the imprint substrate provided in some embodiments of this application;

[0024] Figure 13 This is a schematic diagram of the imprint substrate in the pre-cutting state provided in some embodiments of this application;

[0025] Figure 14 This is a schematic diagram of the structure of the imprinted substrate in the cut state provided in some embodiments of this application;

[0026] Figure 15 This is a schematic diagram of the cutting trajectory of the imprint substrate provided in some embodiments of this application;

[0027] Figure 16 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application;

[0028] Figure 17 yes Figure 16 The diagram shows a partial cross-sectional structure of the first and second waveguide displays.

[0029] Figure 18This is a schematic diagram of the cutting trajectory of the imprint substrate provided in some embodiments of this application;

[0030] Figure 19 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application;

[0031] Figure 20 yes Figure 19 The diagram shows a partial cross-sectional structure of the first and second waveguide displays.

[0032] Figure 21 This is a schematic diagram of the waveguide display device provided in some embodiments of this application;

[0033] Figure 22 This is a schematic diagram of the assembly structure of a waveguide display device provided in some embodiments of this application;

[0034] Figure 23 This is a schematic diagram of the assembly structure of the first lens and the first frame provided in some embodiments of this application;

[0035] Figure 24 This is a schematic diagram of the structure of a virtual reality display system provided in some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Display device; 3. Waveguide display device; 10. Waveguide display; 11. Lens; 111. Waveguide substrate; 113. Coupled-in grating; 115. Coupled-out grating; 12. Frame; 13. Optical mechanism; 14. Eye-adaptive area; 20. First waveguide display; 21. First frame; 211. Central axis; 22. First lens; 221. First coupled-in grating; 222. First coupled-out grating; 223. First folding grating; 224. First end; 23 1. First optical engine; 30. Second waveguide display; 31. Second frame; 311. Central axis; 32. Second lens; 321. Second coupling grating; 322. Second coupling grating; 323. Second folding grating; 324. Second end; 33. Second optical engine; 40. Main body; 401. Optical engine; 43. Imprinted substrate; 431. Waveguide plate; 432. Embossed grating; 44. Lens; 51. Frame; 52. First frame; 521. Optical engine. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] The reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] This application provides a display device for projecting virtual images. With the growing popularity of the metaverse concept, the development of display devices that connect the virtual and real worlds is becoming increasingly important. Taking AR glasses as an example, AR devices can calculate the position and angle of camera images in real time using a camera device, match them with corresponding virtual images such as images, videos, and 3D models stored in a database, and then display the virtual images on the screen of the AR glasses in the real world, allowing for user interaction. It should be noted that the display device provided in this application includes, but is not limited to, wearable helmets, vehicle windows, and wearable glasses.

[0041] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a waveguide display of a display device provided in some embodiments of this application. In some embodiments, the waveguide display 10 includes a lens 11 and a frame 12, with the lens 11 mounted on the frame 12. An optical engine 13 is disposed within the frame 12 for projecting images onto the lens 11. A surface-embossed grating is disposed on the lens 11 for dilating the projection emitted by the optical engine 13 and projecting it onto the user's eyeball.

[0042] It should be noted that the terms "comprising" and "having," and any variations thereof, in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0043] Please refer to the following: Figure 2 and Figure 3, Figure 2 These are schematic diagrams of the lens structure provided in some embodiments of this application. Figure 3 This is a schematic diagram illustrating the projection principle of a waveguide display provided in some embodiments of this application. In some embodiments, the lens 11 includes a waveguide substrate 111, a coupling grating 113, and a coupling grating 115. The waveguide substrate 111 has a coupling region and a coupling region. The coupling grating 113 is disposed on the coupling region of the waveguide substrate 111, and the coupling grating 115 is disposed on the coupling region of the waveguide substrate 111. The coupling grating 113 corresponds to the optomechanical system 13.

[0044] The coupling grating 113 is used to couple the light beam projected by the optomechanism 13 into the waveguide substrate 111, ensuring that the light beam satisfies the condition of total internal reflection propagation in the waveguide substrate 111. The coupling grating 115 is used to couple the totally internally reflected light beam out of the waveguide substrate 111, forming an image projected onto the human eye. The coupling grating 115 can dilate the pupil of the image generated by the optomechanism 13, ensuring that the human eye can see the image within a certain range of change when the pupil's position relative to the lens 11 changes. The area comprising all positions of the image visible to the pupil is defined as the adaptive zone 14.

[0045] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a lens provided in some embodiments of this application. Optionally, the lens 11 includes a waveguide substrate 111, a coupling grating 113, a coupling grating 115, and a transition grating 117. The waveguide substrate 111 is further designed with a transition region between the coupling region and the coupling region. The transition grating 117 is disposed on the transition region of the waveguide substrate 111. The light beam projected by the coupling grating 113 can be deflected and coupled out to the coupling grating 115 via the transition grating 117.

[0046] The projected image from a waveguide display 10 to the human eye typically includes the displayed image and a rainbow effect that causes interference. This is because the diffraction angle of the grating is closely related to the wavelength; different wavelengths have different diffraction angles. Even with a laser light source, there is still a certain wavelength range for the image light source, causing different colors to overlap and creating a rainbow effect—a common rainbow effect in diffractive waveguides. Due to this rainbow effect, many diffractive waveguide products are difficult to apply to applications requiring high image quality, such as movie watching and gaming.

[0047] The study found that the significance of the rainbow effect is related to the length of the eye-friendly region 14 of the waveguide display 10. Experiments show that the larger the length of the eye-friendly region 14 of the waveguide display 10, the more obvious the rainbow pattern is in the image projected by the waveguide display 10. The length of the eye-friendly region 14 can be modulated by adjusting the length of the coupling grating 115.

[0048] For example, three waveguide displays 10 with different eye-friendly areas 14 are used to project images. The lengths of the coupling gratings 115 of the three waveguide displays 10 are x1, x2, and x3, respectively, where x1 is greater than x2, which is greater than x3. This results in the eye-friendly area 14 lengths of the three waveguide displays 10 decreasing sequentially. Specifically, the waveguide display 10 with a coupling grating length of x1 has an eye-friendly area 14 length of 13 mm and a width of 8 mm. The waveguide display 10 with a coupling grating length of x2 has an eye-friendly area 14 length of 11 mm and a width of 8 mm. The waveguide display 10 with a coupling grating length of x3 has an eye-friendly area 14 length of 10 mm and a width of 8 mm. It can be clearly seen that the rainbow effect is most pronounced in the image projected by the waveguide display 10 with the longest eye-friendly area 14, while the prominence of the rainbow effect decreases sequentially in the images projected by the two waveguide displays 10 with progressively shorter eye-friendly area 14 lengths. Therefore, reducing the length of the eye-friendly area 14 is an effective way to reduce the rainbow effect.

[0049] However, the length of the eye-sensing zone 14 is crucial to whether the user can clearly see the entire virtual image. Please refer to... Figure 5 , Figure 5 This is a schematic diagram illustrating the analysis of the eye-friendly zone length in a waveguide display. For example... Figure 5 As shown, the distance t1 between the central axes of the two first human eyes 181 is defined as the maximum interpupillary distance of the human eye, and the distance t2 between the central axes of the two second human eyes 182 is defined as the minimum interpupillary distance of the human eye.

[0050] The length of the eye-friendly zone 14 is related to the interpupillary distance distribution range of the population to be covered, as well as the diameter of the eyeball, the diameter of the pupil, and the horizontal field of view angle of the waveguide display 10, satisfying the following relationship:

[0051] The length of the suitable eye zone is greater than or equal to the effective interpupillary distance range + eye movement compensation value + pupil diameter compensation value;

[0052] Wherein, the eye rotation compensation value = D / 2*sin(FOVx / 2)*2, where D is the diameter of the eyeball and FOVx is the horizontal field of view angle; the pupil diameter compensation value = d / 2*cos(FOVx / 2)*2, where d is the diameter of the pupil.

[0053] It should be noted that the interpupillary distance (IPD) of a crowd is not fixed; therefore, it is necessary to collect and analyze data on the distribution of interpupillary distance. The crowd interpupillary distance distribution data is as follows:

[0054] IPD (mm) overall <![CDATA[1 th Percentiles 56.18 <![CDATA[5 th Percentiles 58.25 <![CDATA[10 th Percentiles 59.47 median 63.90 <![CDATA[90 th Percentiles 68.68 <![CDATA[95 th Percentiles 70.06 <![CDATA[99 th Percentiles 73.23

[0055] Therefore, when the interpupillary distance (IPD) covers 58.25 mm to 70.06 mm, it can cover more than 90% of the population. The appropriate eye zone length can then be calculated. For example, the diameter of an adult's eyeball is approximately 24 mm, so we take D = 24 mm; the pupil diameter is approximately 2.5–4 mm, so we take d = 4 mm; the diagonal field of view of the waveguide display 10 can be 30°, so we take FOVx = 24.2°; the maximum IPD is 70.06 mm, and the minimum IPD is 58.25 mm. Therefore, the effective IPD coverage range is (70.06 - 58.25) / 2 = 5.905 mm. Using the above formula, we can calculate that the appropriate eye zone length needs to be greater than 14.857 mm to cover more than 90% of the population. Therefore, a conventional waveguide display 10 will modulate the appropriate eye zone 14 to be greater than 14.857 mm to prevent the user's pupil from falling outside the boundary of the appropriate eye zone 14, thus avoiding obstruction of at least a portion of the image intended for the user's eyes.

[0056] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a display device provided in some embodiments of this application. Embodiments of this application provide a display device 1, including a first waveguide display 20, a second waveguide display 30, and a main body 40. The effective interpupillary distance coverage ranges of the first waveguide display 20 and the second waveguide display 30 are different, allowing the eye-friendly area 14 of either waveguide display to be modulated to a smaller parameter to reduce the rainbow effect. The first waveguide display 20 and the second waveguide display 30 can be selectively mounted on the main body 40, enabling the display device 1 to adapt to people with different interpupillary distances, avoiding the situation where a single waveguide display does not correspond to the user's interpupillary distance, resulting in the user's glasses not receiving the entire image.

[0057] It should be noted that the display device 1 provided in this application embodiment may optionally include three or more waveguide displays, and the eye-friendly area 14 of each waveguide display can be modulated to different parameters.

[0058] Please see Figure 7 , Figure 7 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application. In some embodiments, the first waveguide display 20 includes a first lens frame 21 and two first lenses 22 mounted on the first lens frame 21. Each first lens 22 is provided with a first coupling grating 221 and a first coupling grating 222. The distance between the first coupling grating 222 and the central axis 211 of the first lens frame 21 is a first spacing a. Optionally, a first deflection grating 223 may also be provided on the first lens 22. It should be noted that the distance between two objects described in this application should be interpreted as the length between the two closest points of the two objects.

[0059] The second waveguide display 30 includes a second frame 31 and two second lenses 32 mounted on the second frame 31. Each second lens 32 is provided with a second coupling grating 321 and a second coupling grating 322. The distance between the second coupling grating 322 and the central axis 311 of the second frame 31 is a second spacing b. Optionally, a second deflection grating 323 may also be provided on the second lens 32. For ease of observation, Figure 9 The central axis 211 of the first frame 21 shown coincides with the central axis 311 of the second frame 31.

[0060] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified.

[0061] In this design, the second spacing b is not equal to the first spacing a, resulting in different effective interpupillary distance (IPD) coverage areas for the first waveguide display 20 and the second waveguide display 30. For example, the first spacing a can be smaller than the second spacing b, so that the IPD corresponding to the first waveguide display 20 is smaller than that corresponding to the second waveguide display 30. Specifically, the difference between the second spacing b and the first spacing a can be in the range of 3mm-5mm, such as 3.5mm, 4mm, 4.5mm, etc. In other words, the first waveguide display 20 can be considered as a small IPD version of the waveguide display, and the second waveguide display 30 can be considered as a large IPD version of the waveguide display.

[0062] Display device 1 can accommodate user needs by selectively installing one of two versions of waveguide displays on the main body 40. For example, a user can choose to install one of the waveguide displays according to their interpupillary distance, or switch to the other waveguide display if they find that one waveguide display is not suitable for their interpupillary distance.

[0063] Optionally, the display device 1 further includes a switching mechanism for switching the first waveguide display 20 and the second waveguide display 30 onto the main body 40. The specific choice of the switching mechanism is not limited, and includes, but is not limited to, a translational switching structure, a rotary switching structure, a flip-type switching structure, etc.

[0064] Furthermore, the modulation of the first spacing a and the second spacing b in the embodiments of this application can be achieved in various ways. For example, the relative distance between the two first lenses 22 of the first waveguide display 20 can be modulated to be smaller than the relative distance between the two second lenses 32 of the second waveguide display 30. Other methods will be further elaborated below.

[0065] Through the above design, display device 1 can still meet the needs of most users even when the effective interpupillary distance coverage of a single waveguide display is small. Furthermore, the eye-friendly area 14 of a single waveguide display can be modulated to a smaller length based on this design, thereby reducing the rainbow effect.

[0066] The display device 1 provided in this application embodiment has a first waveguide display 20 with a small IPD version and a second waveguide display 30 with a large IPD version. Compared with a display device using a single waveguide display, the length of the eye-friendly area 14 of any waveguide display of the display device 1 provided in this application embodiment can be significantly reduced.

[0067] Optionally, the eye-friendly area 14 of the first lens 22 of the first waveguide display 20 and the second lens 32 of the second waveguide display 30 is not greater than 14.857 mm and not less than 12 mm. Optionally, the effective interpupillary distance coverage range of the first lens 22 of the first waveguide display 20 is 58.25 mm to 64.16 mm, and the effective interpupillary distance coverage range of the second lens 32 of the second waveguide display 30 is 64.16 mm to 70.06 mm.

[0068] Through the above design, combined with the interpupillary distance distribution data of the population mentioned above, the first waveguide display 20 of display device 1 can cover the interpupillary distance of 48.12% of the population, and the second waveguide display 30 can cover the interpupillary distance of 41.88% of the population. Thus, while reducing the length of the eye-friendly area 14 of each waveguide display, display device 1 can cover the interpupillary distance of most people.

[0069] Please see Figure 8 , Figure 8 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application. In some embodiments, the relative positions of the first coupling grating 221 and the first coupling grating 222 on the first lens 22 are different from the relative positions of the second coupling grating 321 and the second coupling grating 322 on the second lens 32.

[0070] Specifically, the third distance c between the first insertion grating 221 and the first output grating 222 on the first lens 22 may differ from the fourth distance d between the second insertion grating 321 and the second output grating 322 on the second lens 32. For example, the third distance c between the first insertion grating 221 and the first output grating 222 may be greater than the fourth distance d between the second insertion grating 321 and the second output grating 322. Optionally, the difference between distance c and distance d may range from 3mm to 5mm, such as 3.5mm, 4mm, 4.5mm, etc.

[0071] Thus, when the relative positions of the first coupling grating 221 and the edge of the first lens 22 are the same, and the relative positions of the second coupling grating 321 and the edge of the second lens 32 are the same, the first spacing a can also be smaller than the second spacing b. With this design, the coupling region of the waveguide substrate can be used as the positioning point for imprinting during grating fabrication, resulting in different relative positions of the coupling gratings of the first lens 22 and the second lens 32.

[0072] Of course, when fabricating the grating, other areas of the waveguide substrate can also be used as positioning points for imprinting. Therefore, the relative positions of the first coupling grating 221, the second coupling grating 321 and the corresponding lens edge can also be different.

[0073] Please refer to the following: Figure 8 and Figure 9 , Figure 9 yes Figure 8 The diagram shows a partial cross-sectional view of the first and second waveguide displays. The end of the first lens 22 closest to the central axis 211 of the first frame 21 is defined as the first end 224. The end of the second lens 32 closest to the central axis 311 of the second frame 31 is defined as the second end 324. The distance e between the first coupling grating 222 and the first end 224, and the distance f between the second coupling grating 322 and the second end 324, are not equal, thus making the first spacing a not equal to the second spacing b. Optionally, the difference between distance e and distance f is equal to the difference between the first spacing a and the second spacing b. The difference between the third spacing c and the fourth spacing d can be equal to the difference between the second spacing b and the first spacing a.

[0074] Optionally, the distance between the first end 224 and the central axis 211 of the first frame 21 is equal to the distance between the second end 324 and the central axis 311 of the second frame 31, so that the first frame 21 and the second frame 31 can adopt the same nose pad structure to suit the same user.

[0075] The first lens 22 and the second lens 32 can be two lenses of the same shape and size. The relative positions of the first lens 22 and the first frame 21, and the relative positions of the second lens 32 and the second frame 31, can also be the same. Specifically, the distance between each end of the first lens 22 and the first frame 21 is equal to the distance between each end of the second lens 32 and the second frame 31. The first frame 21 and the second frame 31 can also be two frames of the same shape and size, thus allowing the first spacing a to be unequal to the first spacing b, even when the first waveguide display 20 and the second waveguide display 30 have essentially the same shape.

[0076] The first waveguide display 20 may include a first optical engine 23 disposed in the first frame 21, the first optical engine 23 being correspondingly disposed with the first coupling grating 221. Specifically, the first optical engine 23 may be disposed in the temple of the first frame 21, and located at one end of the temple near the coupling region of the first lens 22, so that the first optical engine 23 can project an image onto the first coupling grating 221. The second waveguide display 30 may include a second optical engine 33 disposed in the second frame 31, the second optical engine 33 being correspondingly disposed with the second coupling grating 321. Specifically, the second optical engine 33 may be disposed in the temple of the second frame 31, and located at one end of the temple near the coupling region of the second lens 32, so that the second optical engine 33 can project an image onto the second coupling grating 321.

[0077] Please refer to the following: Figure 9 and Figure 10 , Figure 10 This is a schematic diagram of the structure of a display device provided in some embodiments of this application.

[0078] In some embodiments, the display device 1 includes an optical engine 401 disposed on the main body 40. The optical engine 401 is configured to emit a projected image toward either a first coupling grating 221 or a second coupling grating 321. When the display device 1 is in a state where the first waveguide display 20 is mounted on the main body 40, the optical engine 401 can emit a projected image toward the first coupling grating 221, enabling the first coupling grating 222 to couple the projected image out. When the display device 1 is in a state where the second waveguide display 30 is mounted on the main body 40, the optical engine 401 can emit a projected image toward the second coupling grating 321, enabling the second coupling grating 322 to couple the projected image out.

[0079] It should be noted that the above grating design can be achieved by using two different nanoimprint templates during grating fabrication. Nanoimprint templates are essential tools in the nanoimprint process for fabricating surface relief gratings.

[0080] Please see Figure 11 , Figure 11 This is a schematic diagram of the lens manufacturing process provided in some embodiments of this application. In some embodiments, the lens manufacturing process may include:

[0081] S1, Provide waveguide substrate.

[0082] The waveguide substrate is a silicon substrate, such as a wafer.

[0083] S2. Perform surface treatment on the waveguide substrate.

[0084] Surface treatment includes, but is not limited to, cleaning.

[0085] S3. Apply imprinting adhesive to the surface of the waveguide substrate.

[0086] Coating methods include, but are not limited to, spin coating.

[0087] S4. Bake the waveguide substrate.

[0088] After baking, the imprinting adhesive solvent on the waveguide substrate surface is removed. Following this treatment, the waveguide substrate can be used to fabricate gratings. The lens fabrication process may further include:

[0089] S5. The waveguide substrate is imprinted using a nanoimprint template.

[0090] Before imprinting, the surface of the nanoimprint template can be treated to prevent adhesion.

[0091] S6. Perform ultraviolet exposure.

[0092] Expose the imprinted surface of the waveguide substrate to ultraviolet light to cure the imprinting adhesive.

[0093] S7. Disassemble the nanoimprint template.

[0094] After curing, the nanoimprint template is separated from the waveguide substrate to obtain an imprint substrate with a surface relief grating.

[0095] Please see Figure 12 , Figure 12 This is a partial structural schematic diagram of the imprinted substrate provided in some embodiments of this application. The imprinted substrate 43 can be fabricated using the above-described nanoimprinting process. The imprinted substrate 43 includes a waveguide plate 431 and an embossed grating 432 formed on the surface of the waveguide plate 431. The embossed grating 432 can be considered as a nanoimprinting template transferring its structure onto the imprinting adhesive on the surface of the waveguide substrate. The gratings on the first lens 22 and the second lens 32 described above can both be embossed gratings 432 fabricated in the above manner.

[0096] Nanoimprint lithography is the most common method for mass production of surface-embossed grating waveguides. Optionally, the first lens 22 and the second lens 32 can also be fabricated using other methods, such as hot embroidery or micro contact printing. Compared to other processes, nanoimprint lithography allows for large-scale mass production immediately after the nanoimprint template is fabricated, resulting in higher production efficiency.

[0097] It should be noted that the imprinted substrate 43, once obtained, can be used directly as a lens for a waveguide display, or it can be further cut into the required shape and used as a lens.

[0098] Please refer to the following: Figure 13 and Figure 14 , Figure 13This is a schematic diagram of the imprint substrate in the pre-cutting state according to some embodiments of this application. Figure 14 This is a schematic diagram of the structure of the embossed substrate in the cut state according to some embodiments of this application. After the embossed substrate 43 is cut, a lens 44 of a suitable shape can be obtained. The shape of the lens 44 can be determined according to actual needs. In the embodiments of this application, the first lens 22 and the second lens 32 described above can be obtained by cutting multiple identical embossed substrates 43 into different shapes.

[0099] Due to the long processing cycle and high processing cost of nanoimprint templates, in order to reduce the manufacturing cost of the first waveguide display 20 and the second waveguide display 30, this application embodiment further provides a first lens 22 and a second lens 32 for the display device 1. The shape and spacing of the first coupling grating 221 and the first coupling grating 222 on the first lens 22 are the same as the shape and spacing of the second coupling grating 321 and the second coupling grating 322 on the second lens 32. The first coupling grating 221 and the first coupling grating 222, as well as the second coupling grating 321 and the second coupling grating 322, can be fabricated using the same nanoimprint template. Therefore, the first lens 22 and the second lens 32 do not require two different sets of nanoimprint templates during fabrication, which helps to reduce manufacturing costs.

[0100] Optionally, the first lens 22 and the second lens 32 are both manufactured by the following method: imprinting a nanoimprint template onto a substrate to obtain an imprinted substrate having an input grating and an output grating; cutting the imprinted substrate in different ways to obtain the first lens 22 and the second lens 32 respectively.

[0101] Specifically, the preparation method may include:

[0102] The preparation of the first lens 22 includes: imprinting a first substrate with a nanoimprint template to obtain a first imprint substrate having a first coupling grating 221 and a first coupling grating 22; and cutting the first imprint substrate to obtain the first lens 22.

[0103] The preparation of the second lens 32 includes: imprinting on a second substrate using the same nanoimprint template as the one used to prepare the first lens 22, to obtain a second imprint substrate having a second coupling grating 321 and a second coupling grating 322; and cutting the second imprint substrate to obtain the second lens 32.

[0104] Optionally, the first lens 22 and the second lens 32 have the same outer contour. The distance between the edge of the first lens 22 near the central axis of the frame and the first coupling grating 222 is not equal to the distance between the edge of the second lens 32 near the central axis of the frame and the second coupling grating 322. The distance between the edge of the first lens 22 away from the central axis of the frame and the first coupling grating 222 is not equal to the distance between the edge of the second lens 32 away from the central axis of the frame and the second coupling grating 322.

[0105] It should be noted that the "frame central axis" mentioned above refers to the central axis where the central axis 211 of the first frame 21 and the central axis 311 of the second frame 31 coincide when mounted on the main body 40. Therefore, the edge of the first lens 22 near the frame central axis is equivalent to the edge of the first lens 22 near the central axis 211 of the first frame 21; the edge of the second lens 32 near the frame central axis is equivalent to the edge of the second lens 32 near the central axis 311 of the second frame 31. Alternatively, it can be understood that when mounted on the main body 40, the central axis 211 of the first frame 21 and the central axis 311 of the second frame 31 coincide on the frame central axis.

[0106] Specifically, please refer to Figure 15 , Figure 15 This is a schematic diagram of the cutting trajectory of the imprinted substrate provided in some embodiments of this application. In the step of cutting the first imprinted substrate, cutting can be performed along the first cutting trajectory g1. In the step of cutting the second imprinted substrate, cutting can be performed along the second cutting trajectory g2. The first and second imprinted substrates are imprinted using the same nanoimprint template. The lenses obtained by cutting along the first cutting trajectory g1 and the second cutting trajectory g2 have the same shape and area; the only difference is the cutting position. The second cutting trajectory g2 can be considered as a cutting trajectory obtained by translating the first cutting trajectory g1.

[0107] It should be noted that the preparation method provided in the embodiments of this application may also include other nanoimprinting process steps, please refer to the above for details, which will not be repeated here.

[0108] In some embodiments, the preparation method may further include:

[0109] The first lens 22 is installed in a preset position on the first frame 21, and the second lens 32 is installed in a preset position on the second frame 31, such that the distance between the edge of the first lens 22 near the central axis of the frame and the central axis of the first frame 21 is equal to the distance between the edge of the second lens 32 near the central axis of the frame and the central axis of the second frame 31, thereby making the distance between the first coupling grating 222 and the central axis of the first frame 21 unequal to the distance between the second coupling grating 322 and the central axis of the second frame 31.

[0110] Please refer to the following: Figure 16 and Figure 17 , Figure 16 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application. Figure 17 yes Figure 16 The diagram shows a partial cross-sectional structure of the first and second waveguide displays. Figure 16 The first lens 22 shown can be obtained by cutting the first imprinted substrate along the first cutting trajectory g1, and the second lens 32 can be obtained by cutting the second imprinted substrate along the second cutting trajectory g2.

[0111] The first lens 22 and the second lens 32 obtained by the above method can have the same shape, but the relative positions of the gratings on the lenses are different. Specifically, the distance between the first coupling grating 222 and the central axis 211 of the first frame 21 is the first spacing h, and the distance between the second coupling grating 322 and the central axis 311 of the second frame 31 is the second spacing i. The first spacing h is less than the second spacing i. Optionally, the difference between the second spacing i and the first spacing h is in the range of 3mm-5mm, such as 3.5mm, 4mm, 4.5mm, etc.

[0112] The distance between the first coupling grating 222 and the first end 224 of the first lens 22 is a third preset value j, and the distance between the second coupling grating 322 and the second end 324 of the second lens is a fourth preset value k. The third preset value j is not equal to the fourth preset value k. The first end 224 is the end of the first lens 22 near the central axis 221 of the first frame 21, and can be considered as the edge of the first lens 22 near the central axis of the frame; the second end 324 is the end of the second lens 32 near the central axis 311 of the second frame 31, and can be considered as the edge of the second lens 32 near the central axis of the frame.

[0113] Correspondingly, the distance between the third end 225 of the first lens 22 and the first coupling grating 222 is not equal to the distance between the fourth end 325 of the second lens 32 and the second coupling grating 322. The third end 225, opposite to the first end 224, can be considered as the edge of the first lens 22 away from the central axis of the frame; the fourth end 325, opposite to the second end 324, can be considered as the edge of the second lens 32 away from the central axis of the frame.

[0114] The distance between the first end 224 and the central axis 211 of the first frame 21, and the distance between the second end 324 and the central axis 311 of the second frame 31, can be equal, so that when the third preset value j is not equal to the fourth preset value k, the first spacing h and the second spacing i are not equal. For example, the shape and size of the first lens 22 can be the same as the shape and size of the second lens 32, and the shape and size of the first frame 21 can be the same as the shape and size of the second frame 31, and the structures of the first frame 21 and the second frame 31 for mounting the lenses are also the same.

[0115] Optionally, the fourth preset value k is greater than the third preset value j, and the difference between the fourth preset value k and the third preset value j is in the range of 3mm-5mm, such as 3.5mm, 4mm, 4.5mm, etc. The difference between the fourth preset value k and the third preset value j can be equal to the difference between the second spacing i and the first spacing h.

[0116] Correspondingly, the distance between the third end 225 and the first coupling grating 222 is the fifth preset value, and the distance between the fourth end 325 and the second coupling grating 322 is the sixth preset value; the difference between the sixth preset value and the fifth preset value can also be equal to the difference between the first spacing h and the second spacing i.

[0117] Please continue reading. Figure 17 Since the gratings on the first lens 22 and the second lens 32 are imprinted using the same nanoimprint template, the relative positions of the first coupling grating 221 and the first coupling grating 222, as well as the relative positions of the second coupling grating 321 and the second coupling grating 322, are the same. Therefore, the distance between the first coupling grating 221 and the end of the first lens 22 away from the first end 224, and the distance between the second coupling grating 321 and the end of the second lens 32 away from the second end 324, are not equal.

[0118] The first frame 21 also houses a first optical engine 23 corresponding to the first coupling grating 221, and the second frame 31 houses a second optical engine 33 corresponding to the second coupling grating 321. The ends of the first frame 21 and the second frame 31 closest to the corresponding lenses can be extended to provide installation space for the corresponding optical engines. This allows the first frame 21 to maintain the same shape as the second frame 31 even when the first optical engine 23 corresponds to the first coupling grating 221 and the second optical engine 33 corresponds to the second coupling grating 321. Therefore, the first frame 21 and the second frame 31 can be manufactured using the same structural material, which helps reduce costs. The increase in width required for the area of ​​the first frame 21 accommodating the first optical engine 23 and the area of ​​the second frame 31 accommodating the second optical engine 33 is the absolute value of the difference between a fourth preset value k and a third preset value j. Since the first lens 22 and the second lens 32 are exactly the same size, they can also use the same frame.

[0119] In other embodiments, the preparation method may further include:

[0120] During the preparation of the first lens 22 and the second lens 32, the first imprinting substrate and the second imprinting substrate are cut into different shapes, and the areas of the first lens 22 and the second lens 32 are different, so that the relative position of the edge of the first lens 22 near the central axis of the frame and the first coupling grating 222 is different from the relative position of the edge of the second lens 32 near the central axis of the frame and the second coupling grating 322.

[0121] The outer contours of the first lens 22 and the second lens 32 are different. The distance between the edge of the first lens 22 near the central axis of the frame and the first coupling grating 222 is not equal to the distance between the edge of the second lens 32 near the central axis of the frame and the second coupling grating 322.

[0122] Optionally, the distance between the edge of the first lens 22 away from the central axis of the frame and the first coupling grating 222 is equal to the distance between the edge of the second lens 32 away from the central axis of the frame and the second coupling grating 322. Similarly, the distance between the edge of the first lens 22 away from the central axis of the frame and the first coupling grating 221 is equal to the distance between the edge of the second lens 32 away from the central axis of the frame and the second coupling grating 321.

[0123] Specifically, please refer to Figure 18 , Figure 18This is a schematic diagram of the cutting trajectory of the imprinted substrate provided in some embodiments of this application. In the step of cutting the first imprinted substrate, cutting can be performed along the third cutting trajectory g3. In the step of cutting the second imprinted substrate, cutting can be performed along the fourth cutting trajectory g4. The first and second imprinted substrates are imprinted using the same nanoimprint template. The lens areas obtained by cutting along the third cutting trajectory g3 and the fourth cutting trajectory g4 are not equal. The fourth cutting trajectory can be considered as surrounding the third cutting trajectory.

[0124] Please refer to the following: Figure 19 and Figure 20 , Figure 19 This is a comparative structural diagram of a first waveguide display and a second waveguide display provided in some embodiments of this application. Figure 20 yes Figure 19 The diagram shows a partial cross-sectional structure of the first and second waveguide displays. Figure 19 The first lens 22 shown can be obtained by cutting the first imprinted substrate along the third cutting trajectory g3 mentioned above, and the second lens 32 can be obtained by cutting the second imprinted substrate along the fourth cutting trajectory g4 mentioned above.

[0125] The first lens 22 and the second lens 32 obtained by the above method have different shapes and areas. Specifically, the distance between the first coupling grating 222 and the central axis 211 of the first frame 21 is the first spacing l, and the distance between the second coupling grating 322 and the central axis 311 of the second frame 31 is the second spacing m. The first spacing l is less than the second spacing m. Optionally, the difference between the second spacing m and the first spacing l is in the range of 3mm-5mm, such as 3.5mm, 4mm, 4.5mm, etc.

[0126] The distance between the first coupling grating 222 and the first end 224 of the first lens 22 is a seventh preset value n, and the distance between the second coupling grating 322 and the second end 324 of the second lens 32 is an eighth preset value o. The seventh preset value n is not equal to the eighth preset value o. The distance between the first end 224 and the central axis 211 of the first frame 21 can be equal to the distance between the second end 324 and the central axis 311 of the second frame 31, so that when the seventh preset value n is not equal to the eighth preset value o, the first spacing l and the second spacing m are not equal. For example, the area of ​​the first lens 22 is smaller than that of the second lens 32. When the centers of the two lenses are coaxially arranged, the second lens 32 can completely cover the first lens 22. In other words, the shape of the first lens 22 is similar to that of a lens obtained by further cutting off a portion of the waveguide sheet that does not involve the grating from the second lens 32. This portion of the waveguide sheet can be the second end 324 of the second lens 32.

[0127] Wherein, the first end 224 can be regarded as the edge of the first lens 22 near the central axis of the frame, and the second end 324 can be regarded as the edge of the second lens near the central axis of the frame. The difference between the seventh preset value n and the eighth preset value o can be equal to the difference between the first spacing l and the second spacing m.

[0128] The end of the first lens 22 furthest from the first end 224 can be considered as the edge of the first lens 22 furthest from the central axis of the frame, and the end of the second lens 32 furthest from the second end 324 can be considered as the edge of the second lens 32 furthest from the central axis of the frame. The distance between the end of the second lens 32 furthest from the second end 324 and the central axis 311 of the second frame 31 can be greater than the distance between the end of the first lens 22 furthest from the first end 224 and the central axis 211 of the first frame 21, and the difference can be equal to the difference between the eighth preset value o and the seventh preset value n. Specifically, the distance between the end of the first lens 22 furthest from the first end 224 and the first coupling grating 224 is equal to the distance between the end of the second lens 32 furthest from the second end 324 and the second coupling grating 324.

[0129] Optionally, the eighth preset value o is greater than the seventh preset value n, and the difference between the eighth preset value o and the seventh preset value n is in the range of 3mm-5mm, such as 3.5mm, 4mm, 4.5mm, etc. The difference between the eighth preset value o and the seventh preset value n can be equal to the difference between the second spacing m and the first spacing l. Since the overall size of the first lens 22 is smaller than that of the second lens 32, the structural parts of the first frame 21 and the second frame 31 used for mounting the lens also need to be adjusted accordingly.

[0130] Furthermore, in some embodiments, the distance between the edge of the first lens 22 away from the central axis of the frame and the first coupling grating 222 may not be equal to the distance between the edge of the second lens 32 away from the central axis of the frame and the second coupling grating 322. For example, the cutting trajectory of the first lens 22 can be determined by... Figure 18 The third cutting trajectory g3 shown is obtained by shifting it to the left.

[0131] Please continue reading. Figure 18 and Figure 20The coupling areas of the first lens 22 and the second lens 32 can be kept consistent, so that the relative positions of the temples of the first frame 21 and the first optical engine 23 mounted on the temples, and the temples of the second frame 31 and the second optical engine 33 mounted on the temples, with the corresponding lenses can also be kept consistent. The first optical engine 23 is correspondingly arranged with the first coupling grating 221, and the second optical engine 33 is correspondingly arranged with the second coupling grating 321. Since the first lens 22 and the second lens 32 are of different sizes, and the positions of the first optical engine 23 and the second optical engine 33 are also different, two different sets of structural materials are required when manufacturing the first frame 21 and the second frame 31. However, since the size of the first lens 22 in this embodiment is reduced, and the areas of the first frame 21 and the second frame 31 used to accommodate the optical engines do not need to be expanded, the overall size and weight of the display device 1 provided in this embodiment are reduced.

[0132] It should be noted that, in the embodiments of this application, two types of lenses with the same grating structure and dimensions can be used as the first lens 22 and the second lens 32, and two frames with different shapes can be used as the first frame 21 and the second frame 31, so that the distance between the central axis 211 of the first lens 22 and the first frame 21 is different from the distance between the central axis 311 of the second lens 32 and the second frame 31.

[0133] In other embodiments, the preparation method provided in this application may further include:

[0134] Provide frames;

[0135] One of the first lens and the second lens is selectively installed in a preset position on the frame, such that when either the first lens or the second lens is installed on the frame, the distance between it and the central axis of the frame is equal, thereby making the first gap and the second gap unequal. The first gap is the distance between the first coupling grating and the central axis of the frame when the first lens is installed on the frame, and the second gap is the distance between the second coupling grating and the central axis of the frame when the second lens is installed on the frame.

[0136] Please see Figure 21 , Figure 21 This is a schematic diagram of the waveguide display device provided in some embodiments of this application.

[0137] In some embodiments, the waveguide display device 3 includes a frame 51, two first lenses 22, and two second lenses 32. The waveguide display device 3 may use the same lenses as the display device 1 described above. The first lenses 22 and the second lenses 32 of the waveguide display device 3 may be optionally mounted on the frame 51.

[0138] When the first lens 22 is mounted on the frame 51, the first coupling grating 222 of the first lens 22 can form a first distance with the central axis of the frame 51. When the second lens 32 is mounted on the frame 51, the second coupling grating 322 of the second lens 32 can form a second distance with the central axis of the frame 51. The first distance and the second distance are not equal, so that the waveguide display device 3 can adapt to people with different interpupillary distances.

[0139] The shape and spacing of the first insertion grating 221 and the first output grating 222 on the first lens 22 can be the same as the shape and spacing of the second insertion grating 321 and the second output grating 322 on the second lens 32.

[0140] The difference between the distance between the edge of the first lens 22 mounted on the frame 51 near the central axis of the frame 51 and the first coupling grating 222, and the distance between the edge of the second lens 32 mounted on the frame 51 near the central axis of the frame 51 and the second coupling grating 322, is equal to the difference between the first spacing and the second spacing.

[0141] Optionally, the waveguide display device 3 also has a switching mechanism for switching the first lens 22 and the second lens 32 on the frame 51. The specific choice of the switching mechanism is not limited, and includes, but is not limited to, a translational switching structure, a rotary switching structure, a flip-type switching structure, etc.

[0142] The main difference between waveguide display device 3 and display device 1 is that display device 1 uses a selective installation of waveguide displays to adapt to people with different interpupillary distances, while waveguide display device 3 uses a selective installation of lenses to adapt to people with different interpupillary distances. Understandably, the design of display device 1 can also be applied to waveguide display device 3.

[0143] In addition, the waveguide display device 3 may also use two lenses with the same shape and grating structure as the first lens 22 and the second lens 32, and set two areas with different distances from the central axis on the frame 51 as the mounting areas of the first lens 22 and the second lens 32, so that the distance between the first lens 22 and the central axis of the frame 51 when the first lens 22 is mounted on the frame 51 is different from the distance between the second lens 32 and the central axis of the frame 51 when the second lens 32 is mounted on the frame 51.

[0144] Please see Figure 22 , Figure 22 This is a schematic diagram of the assembly structure of a waveguide display device provided in some embodiments of this application. The frame 51 and the first lens 22 of the waveguide display device 3 are designed to be detachable and separable. The first lens 22 can be mounted on the frame 51 or separated from the frame 51, and then the second lens 32 can be mounted on the frame 51.

[0145] The waveguide display device 3 may also include a first frame 52 fixedly mounted to the first lens 22. Please refer to [reference needed]. Figure 23 , Figure 23 This is a schematic diagram of the assembly structure of the first lens and the first frame provided in some embodiments of this application. An optical engine 521 is mounted on the first frame 52 for projecting images onto the first lens 22. Correspondingly, the second lens 32 can also be fixedly connected to a second frame (not shown) similar to the first frame 52. The first frame 52 can be mounted on the lens frame 51 together with the first lens 22, or it can be separated from the lens frame 51 along with the first lens 22, so that the first lens 22 mounted on the lens frame 51 can project images. The second lens 32 and the second frame are designed similarly. The lens and optical engine cooperation structure of the waveguide display device 3 is similar to that of the display device 1 described above, and will not be repeated here.

[0146] It should be noted that in other embodiments, the waveguide display device 3 may also have a common optical engine in the frame 51, which can emit a projected image to the coupling area of ​​a lens on the frame 51, wherein the lens is either a first lens 22 or a second lens 32 that is selectively mounted on the frame 51.

[0147] This application also provides a waveguide assembly, including a first waveguide display 20 and a second waveguide display 30. The waveguide display of the waveguide assembly 4 has the same structure as the waveguide display of the display device 1 described above, and will not be described again here. The first waveguide display 20 and the second waveguide display 30 of the waveguide assembly can be optionally mounted on the display device so that the display device can accommodate people with different interpupillary distances.

[0148] At least one of the display device 1, waveguide display device 3, waveguide assembly 4, and waveguide display 10 provided in this application embodiment can be communicatively connected to an electronic device and constitute a virtual reality display system. The virtual reality display system is based on extended reality (XR) technology, which is the foundation of the metaverse and includes technologies such as VR, AR, and MR.

[0149] Please see Figure 24 , Figure 24 This is a schematic diagram of the structure of a virtual reality display system provided in some embodiments of this application. The following description takes a virtual reality display system including electronic devices and a waveguide display 10 communicatively connected thereto as an example.

[0150] In some embodiments, the virtual reality display system includes a waveguide display 10 and a server 60 communicatively connected to the waveguide display 10. The waveguide display 10 can transmit acquired scene images to the server 60 in real time. The server 60 can use a training algorithm to determine object information in the scene images, and then determine a virtual image corresponding to the scene images based on the object information. The server 60 then returns the virtual image to the waveguide display 10, and the optomechanical system of the waveguide display 10 can project the virtual image onto a lens.

[0151] Optionally, the virtual reality display system also includes a smart terminal, such as a mobile phone 71 or a computer 72, that communicates with the server 60. Users can transmit data to the server 60 via the smart terminal, and then further transmit it to the waveguide display 10. The server 60 can also send a defined virtual image to the smart terminal, allowing users to modify or calibrate the virtual image through the smart terminal. The smart terminal can also be a mobile terminal such as a camera or video recorder, mobile phone, smartphone, laptop, personal digital assistant (PDA), or tablet computer (PAD), or a fixed terminal such as a digital broadcast transmitter, digital TV, desktop computer, or server. Furthermore, in some embodiments, the waveguide display 10 can also be directly connected to the smart terminal.

[0152] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of the units described above is only a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0153] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0154] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0155] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display device, characterized in that, include: The first waveguide display includes a first frame and two first lenses mounted on the first frame. Each first lens is provided with a first coupling grating and a first coupling grating. The distance between the first coupling grating and the central axis of the first frame is a first spacing. The second waveguide display includes a second frame and two second lenses mounted on the second frame. Each second lens is provided with a second coupling grating and a second coupling grating. The distance between the second coupling grating and the central axis of the second frame is a second spacing. The second spacing is not equal to the first spacing. The main body, on which the first waveguide display and the second waveguide display may be optionally mounted, allows the display device to accommodate people with different interpupillary distances.

2. The display device according to claim 1, characterized in that, The length of the eye-friendly area of ​​both the first lens and the second lens is no greater than 14.857 mm and no less than 12 mm.

3. The display device according to claim 2, characterized in that, The effective interpupillary distance coverage range of the first lens is 58.25mm-64.16mm, and the effective interpupillary distance coverage range of the second lens is 64.16mm-70.06mm.

4. The display device according to claim 1, characterized in that, The end of the first lens closest to the central axis of the first frame is the first end, and the distance between the first coupling grating and the first end is a first preset value; the end of the second lens closest to the central axis of the second frame is the second end, and the distance between the second coupling grating and the second end is a second preset value; the first preset value is not equal to the second preset value, and the distance between the first end and the central axis of the first frame is equal to the distance between the second end and the central axis of the second frame.

5. The display device according to claim 4, characterized in that, The second preset value is greater than the first preset value, and the difference between the second preset value and the first preset value is within the range of 3mm-5mm.

6. The display device according to any one of claims 1-5, characterized in that, The third spacing between the first coupling-in grating and the first coupling-out grating is different from the fourth spacing between the second coupling-in grating and the second coupling-out grating, and the difference between the third spacing and the fourth spacing is equal to the difference between the second spacing and the first spacing.

7. The display device according to any one of claims 1-5, characterized in that, The shape and spacing of the first coupling grating and the first coupling grating on the first lens are the same as the shape and spacing of the second coupling grating and the second coupling grating on the second lens, respectively; when installed on the main body, the central axis of the first frame and the central axis of the second frame coincide with each other on the central axis of the frame.

8. The display device according to claim 7, characterized in that, Both the first lens and the second lens are manufactured by the following method: imprinting a nanoimprint template onto a substrate to obtain an imprinted substrate having an input grating and an output grating; cutting the imprinted substrate in different ways to obtain the first lens and the second lens respectively.

9. The display device according to claim 7, characterized in that, The first lens and the second lens have the same outer contour. The distance between the edge of the first lens near the central axis of the frame and the first coupling grating is a third preset value. The distance between the edge of the second lens near the central axis of the frame and the second coupling grating is a fourth preset value. The difference between the third preset value and the fourth preset value is equal to the difference between the first spacing and the second spacing.

10. The display device according to claim 7, characterized in that, The outer contours of the first lens and the second lens are different. The distance between the edge of the first lens near the central axis of the frame and the first coupling grating is a seventh preset value. The distance between the edge of the second lens near the central axis of the frame and the second coupling grating is an eighth preset value. The difference between the seventh preset value and the eighth preset value is equal to the difference between the first spacing and the second spacing. The distance between the edge of the first lens away from the central axis of the frame and the first coupling grating is equal to the distance between the edge of the second lens away from the central axis of the frame and the second coupling grating.

11. The display device according to claim 1, characterized in that, The display device includes an optical engine disposed on the main body and configured to project a projected image onto the first or the second coupling grating.

12. The display device according to claim 1, characterized in that, The display device includes a first optical engine and a second optical engine. The first optical engine is disposed in the first lens frame and is disposed corresponding to the first coupling grating. The second optical engine is disposed in the second lens frame and is disposed corresponding to the second coupling grating.

13. A waveguide display device, characterized in that, The device includes a frame, two first lenses, and two second lenses. Each first lens has a first coupling grating and a first coupling grating, and each second lens has a second coupling grating and a second coupling grating. The first and second lenses can be selectively mounted on the frame. When the first lens is mounted on the frame, the first coupling grating forms a first distance with the central axis of the frame. When the second lens is mounted on the frame, the second coupling grating forms a second distance with the central axis of the frame. The first distance and the second distance are not equal, so that the waveguide display device can adapt to people with different interpupillary distances.

14. The waveguide display device according to claim 13, characterized in that, The shape and spacing of the first coupling grating and the first coupling grating on the first lens are the same as the shape and spacing of the second coupling grating and the second coupling grating on the second lens.

15. The waveguide display device according to claim 13, characterized in that, The difference between the distance between the edge of the first lens mounted on the frame near the central axis and the first coupling grating and the distance between the edge of the second lens mounted on the frame near the central axis and the second coupling grating is equal to the difference between the first spacing and the second spacing.

Images