Light-emitting devices and augmented reality equipment

Abstract

This application discloses a light-emitting device and an augmented reality device. The light-emitting device includes a laser module and an optical waveguide module. The first beam and the second beam generated by the laser module do not meet the conditions for interference. The optical waveguide module has a first coupling region, a second coupling region, and a coupling region. The first beam expands its pupil at the coupling region to form multiple first expanded pupil spots; the second beam expands its pupil at the coupling region to form multiple second expanded pupil spots. The multiple first expanded pupil spots do not overlap with each other, and the multiple second expanded pupil spots do not overlap with each other. At the coupling region, the multiple first expanded pupil spots and the multiple second expanded pupil spots are arranged alternately, and adjacent first expanded pupil spots and second expanded pupil spots partially overlap. Therefore, the light-emitting device of this application ensures that the first beam and the second beam do not interfere with each other at the coupling region while maintaining the integrity of the field of view, thereby improving the display effect of the augmented reality device.

Description

Technical Field

[0001] This application relates to the field of augmented reality technology, and more specifically, to a light-emitting device and an augmented reality device. Background Technology

[0002] In existing Augmented Reality (AR) devices, researchers typically choose lasers as the imaging light source to improve image display quality. On one hand, lasers offer advantages such as good monochromaticity, high color saturation, and a wide color gamut, significantly enhancing the imaging quality of AR devices. On the other hand, lasers also have a low optical expansion capability, reducing the optical expansion requirements of subsequent optical components and enabling miniaturized designs for AR devices.

[0003] However, since laser is a coherent light source, it is prone to interference, which causes interference fringes to appear in the images seen by users through AR devices, thus affecting the user experience. Utility Model Content

[0004] This application provides a light-emitting device and an augmented reality device.

[0005] According to a first aspect of this application, an embodiment of this application provides a light-emitting device, which includes a laser module and an optical waveguide module. The laser module is used to generate a first beam and a second beam; the first beam and the second beam do not satisfy the conditions for interference. The optical waveguide module has a first coupling region, a second coupling region, and a coupling out region. The first beam is coupled into the first coupling region and coupled out through the coupling out region; the second beam is coupled into the second coupling region and coupled out through the coupling out region; the first beam expands its pupil at the coupling out region to form a plurality of first expanded pupil spots; the second beam expands its pupil at the coupling out region to form a plurality of second expanded pupil spots. The plurality of first expanded pupil spots do not overlap with each other, and the plurality of second expanded pupil spots do not overlap with each other; at the coupling out region, the plurality of first expanded pupil spots and the plurality of second expanded pupil spots are arranged alternately, and adjacent first expanded pupil spots and second expanded pupil spots partially overlap.

[0006] In some possible embodiments, the laser module includes a laser unit, an optical modulation unit, and a beam splitting unit; wherein the laser unit is used to emit a first laser beam; the optical modulation unit is disposed in the optical path of the first laser beam and is used to modulate the first laser beam to form a second laser beam carrying an image; the beam splitting unit is disposed between the optical modulation unit and the optical waveguide module and is located in the optical path of the second laser beam, and the beam splitting unit is used to split the second laser beam into a first beam and a second beam; wherein the polarization states of the first beam and the second beam are orthogonal.

[0007] In some possible embodiments, the second laser beam is linearly polarized light, and the beam splitting unit includes a first quarter-wave plate and a second quarter-wave plate; the first quarter-wave plate is disposed in the optical path of a portion of the second laser beam to form a first beam; the second quarter-wave plate is disposed in the optical path of another portion of the second laser beam to form a second beam; wherein one of the first beam and the second beam is left-handed circularly polarized light, and the other is right-handed circularly polarized light; or, the second laser beam is linearly polarized light, and the beam splitting unit includes a half-wave plate and a light-transmitting plate; the half-wave plate is disposed in the optical path of a portion of the second laser beam to form a first beam; the light-transmitting plate is disposed in the optical path of another portion of the second laser beam to form a second beam; wherein one of the first beam and the second beam is P-polarized light, and the other is S-polarized light.

[0008] In some possible embodiments, the second laser beam is linearly polarized light, and the beam splitting unit includes a third quarter-wave plate and a polarizing beam splitter prism; the third quarter-wave plate and the polarizing beam splitter prism are sequentially arranged in the optical path where the second laser beam is located; a portion of the second laser beam is reflected by the polarizing beam splitter prism to form a first beam, and another portion of the second laser beam is transmitted through the polarizing beam splitter prism to form a second beam; wherein, one of the first beam and the second beam is P-polarized light, and the other is S-polarized light.

[0009] In some possible embodiments, the laser module includes a laser unit, an optical path modulation unit, and an optical modulation unit. The laser unit emits a first laser beam. The optical path modulation unit is disposed on the optical path of the first laser beam and is used to modulate the first laser beam into a mixed beam of at least two sub-beams. The optical path difference between any two sub-beams is greater than the coherence length of the first laser beam. The optical modulation unit is disposed between the optical path modulation unit and the optical waveguide module and is located on the optical path of the first laser beam. It is used to modulate the first laser beam to form a second laser beam carrying an image. A portion of the second laser beam is the first beam, and another portion of the second laser beam is the second beam.

[0010] In some possible embodiments, the optical path modulation unit includes a partitioned phase plate and a first optical fiber unit; the partitioned phase plate is disposed on the optical path where the first laser beam is located, and the partitioned phase plate includes multiple phase delay regions, each of which is used to delay the phase of the incident beam to form a sub-beam; wherein any two sub-beams correspond to different phases; the first optical fiber unit includes multiple first sub-fibers, and the multiple first sub-fibers correspond to the multiple phase delay regions; wherein each first sub-fiber is disposed on the optical path where the sub-beam is located, and is used to couple the sub-beam to the optical modulation unit.

[0011] In some possible embodiments, the optical path modulation unit includes a second optical fiber unit; the second optical fiber unit includes a plurality of second sub-optical fibers, each sub-optical fiber being disposed on the optical path of a portion of the first laser beam to form a sub-beam and coupling the sub-beam to the optical modulation unit; wherein the lengths of the plurality of second sub-optical fibers are different.

[0012] In some possible embodiments, the laser module includes a laser unit and an optical modulation unit; wherein the laser unit includes a first laser subunit and a second laser subunit, the first laser subunit being used to emit a first laser sub-beam, and the second laser subunit being used to emit a second laser sub-beam, the center wavelengths of the first laser sub-beam and the second laser sub-beam being different; the optical modulation unit is disposed on the optical path where the first laser sub-beam and the second laser sub-beam are located, and is used to modulate the first laser sub-beam to form a first beam, and to modulate the second laser sub-beam to form a second beam.

[0013] In some possible embodiments, the optical waveguide module includes a first optical waveguide and a second optical waveguide stacked on top of each other; the first optical waveguide is located between the laser module and the second optical waveguide; the first optical waveguide has a first coupling-in region and a coupling-out region, which are located on the same side of the first optical waveguide; the second optical waveguide has a second coupling-in region, which is located on the side of the second optical waveguide facing the first optical waveguide.

[0014] In some possible embodiments, the projections of the first coupling region and the second coupling region in a specified direction are spaced apart; wherein the specified direction is the coupling direction of the first beam; or, the projections of the first coupling region and the second coupling region in the specified direction are adjacent to each other, and the thickness of the first optical waveguide is less than the thickness of the second optical waveguide; wherein the specified direction is the coupling direction of the first beam.

[0015] In some possible embodiments, the polarization state of the first beam is a first polarization state, the polarization state of the second beam is a second polarization state, and the first polarization state and the second polarization state are orthogonal; the optical waveguide module further includes a first coupling grating and a second coupling grating, the first coupling grating being disposed in the first optical waveguide for coupling the first beam to a coupling region; wherein the first coupling grating is a grating sensitive to the first polarization state; the second coupling grating being disposed in the second optical waveguide for coupling the second beam to a coupling region; wherein the second coupling grating is a grating sensitive to the second polarization state.

[0016] In some possible embodiments, the polarization state of the first beam is a first polarization state, the polarization state of the second beam is a second polarization state, and the first polarization state and the second polarization state are orthogonal; the optical waveguide module includes a third optical waveguide, and the first coupling region, the second coupling region and the coupling out region are located on the same side of the third optical waveguide.

[0017] According to a second aspect of this application, embodiments of this application also provide an augmented reality device, the augmented reality device including a housing and the aforementioned light-emitting device, the light-emitting device being disposed in the housing.

[0018] This application provides a light-emitting device and an augmented reality device. The light-emitting device may include a laser module and an optical waveguide module. The laser module is used to generate a first beam and a second beam. The first beam and the second beam do not meet the conditions for interference. For example, the polarization states of the first beam and the second beam can be orthogonal; or the optical path difference between the first beam and the second beam can be greater than the coherence length of the laser, etc.

[0019] The optical waveguide module has a first coupling region, a second coupling region, and a coupling out region. A first beam is coupled into the first coupling region and coupled out through the coupling out region; a second beam is coupled into the second coupling region and coupled out through the coupling out region; the first beam expands its pupil at the coupling out region to form multiple first expanded pupil spots; the second beam expands its pupil at the coupling out region to form multiple second expanded pupil spots.

[0020] On the one hand, the multiple first pupil-expanding light spots in this application do not overlap with each other. That is to say, the light spots formed by the multiple reflections of the first beam in the optical waveguide module are staggered with each other. This can increase the optical path difference between the multiple first beams formed after pupil expansion, thereby reducing the probability of interference between the multiple first beams at the coupling area, and thus reducing the probability of interference fringes appearing. This can improve the display effect of the augmented reality device equipped with the light-emitting device.

[0021] Similarly, it can be seen that the multiple second pupil beams do not overlap with each other. In other words, the beams formed by the multiple reflections of the second beam in the optical waveguide module are staggered. This can increase the optical path difference between the multiple second beams formed after pupil expansion, thereby reducing the probability of interference between the multiple second beams at the coupling area and thus reducing the probability of interference fringes. This can improve the display effect of augmented reality devices equipped with this light-emitting device.

[0022] On the other hand, in the coupling region, multiple first pupil spots and multiple second pupil spots are arranged alternately, and adjacent first pupil spots and second pupil spots partially overlap. Since the conditions for interference are not met between the first beam and the second beam, adjacent first beams and second beams in the coupling region will not interfere with each other, thereby improving the display effect of the augmented reality device equipped with the light-emitting device.

[0023] Furthermore, since the adjacent first and second pupil beams partially overlap, it can be ensured that the multiple first beams and multiple second beams at the coupling region intersect, which can avoid the occurrence of field of view loss in augmented reality devices, thereby ensuring that the human eye can receive the beams within the eye box, thus guaranteeing the user's viewing experience. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0025] Figure 1 This is a schematic diagram of the structure of the augmented reality device provided in the embodiments of this application.

[0026] Figure 2 yes Figure 1 A schematic diagram of a light-emitting device in an augmented reality device is shown.

[0027] Figure 3 This is a schematic diagram of the optical path of an optical waveguide in related technologies.

[0028] Figure 4 yes Figure 2 The diagram shows a first structural schematic of the laser module in the light-emitting device.

[0029] Figure 5 yes Figure 2 The diagram shows a second structural schematic of the laser module in the light-emitting device.

[0030] Figure 6 yes Figure 2 The diagram shows a third structural design of the laser module in the light-emitting device.

[0031] Figure 7 yes Figure 2 The diagram shows the fourth structural design of the laser module in the light-emitting device.

[0032] Figure 8 yes Figure 2 The diagram shows the fifth structural design of the laser module in the light-emitting device.

[0033] Figure 9 yes Figure 2 The diagram shows the sixth structural design of the laser module in the light-emitting device.

[0034] Figure 10 yes Figure 1 Another schematic diagram of the light-emitting device in the augmented reality device shown. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0036] This application provides a light-emitting device 100 and an augmented reality device 200 equipped with the light-emitting device 100. The augmented reality device 200 is a device capable of combining virtual information with the real world. It uses computer technology, sensors, display devices, and other means to overlay virtual images, text, audio, and other information onto the real scene seen by the user in real time, thereby enhancing the user's perception and interaction with the real world. Specifically, the augmented reality device 200 can be AR glasses, AR headsets, AR helmets, etc.

[0037] Please see Figure 1 The augmented reality device 200 may include a light-emitting device 100 and a housing 201. The light-emitting device 100 is disposed within the housing 201, which serves to fix and protect the light-emitting device 100. The light-emitting device 100 can generate and transmit image light carrying image information. When a user wears the augmented reality device 200, this image light can enter the user's eyes, allowing the user to see the image information generated by the augmented reality device 200. Furthermore, the user can also see a corresponding real-world scene through the light-emitting device 100, achieving a display effect that overlays real-world scenes and virtual image information.

[0038] Please see Figure 2 The light-emitting device 100 may include a laser module 120 and an optical waveguide module 140. The laser module 120 generates a first beam A1 and a second beam A2, which do not meet the conditions for interference. For example, the polarization states of the first beam A1 and the second beam A2 may be orthogonal; the optical path difference between the first beam A1 and the second beam A2 may be greater than the coherence length of the laser; or the center wavelengths of the first beam A1 and the second beam A2 may be different, etc.

[0039] In this embodiment, the optical waveguide module 140 is provided with a first coupling region 1401, a second coupling region 1403, and a coupling out region 1405. A first beam A1 is coupled into the optical waveguide module 1401 and coupled out through the coupling out region 1405. A second beam A2 is coupled into the optical waveguide module 1403 and coupled out through the coupling out region 1405. The first beam A1 expands its pupil at the coupling out region 1405 to form multiple first expanded pupil spots S1; the second beam A2 expands its pupil at the coupling out region 1405 to form multiple second expanded pupil spots S2.

[0040] On the one hand, the multiple first pupil-expanding light spots S1 in this application do not overlap with each other. That is to say, the light spots formed by the multiple reflections of the first beam A1 in the optical waveguide module 140 are staggered with each other. This can increase the optical path difference between the multiple first beams A1 formed after pupil expansion, thereby reducing the probability of interference between the multiple first beams A1 at the coupling region 1405, and thus reducing the probability of interference fringes appearing. This can improve the display effect of the augmented reality device 200 equipped with the light-emitting device 100.

[0041] Similarly, it can be seen that the multiple second pupil-expanding light spots S2 do not overlap with each other. That is to say, the light spots formed by the multiple reflections of the second beam A2 in the optical waveguide module 140 are staggered with each other. This can increase the optical path difference between the multiple second beams A2 formed after pupil expansion, thereby reducing the probability of interference of the multiple second beams A2 at the coupling region 1405, and thus reducing the probability of interference fringes appearing. This can improve the display effect of the augmented reality device 200 equipped with the light-emitting device 100.

[0042] On the other hand, at the coupling region 1405, a plurality of first pupil-expanding light spots S1 and a plurality of second pupil-expanding light spots S2 are arranged alternately, and adjacent first pupil-expanding light spots S1 and second pupil-expanding light spots S2 partially overlap. Since the conditions for interference are not met between the first beam A1 and the second beam A2, adjacent first beam A1 and second beam A2 at the coupling region 1405 will not interfere, thereby improving the display effect of the augmented reality device equipped with the light-emitting device 100.

[0043] Furthermore, since the adjacent first pupil beam S1 and second pupil beam S2 partially overlap, it can be ensured that the multiple first beams A1 and multiple second beams A2 at the coupling region 1405 intersect, which can avoid the occurrence of field of view loss in the augmented reality device 200, thereby ensuring that the human eye can receive the beams within the eye box, so as to ensure the user's viewing experience.

[0044] To facilitate understanding, the reasons for interference fringes in augmented reality devices in related technologies will be explained here.

[0045] In related technologies, in order to ensure the continuity of the eyebox at the exit pupil of the optical waveguide in the coupling region, so that the human eye can see a complete image without missing field of view within a certain range, multiple image lights corresponding to different field of view need to overlap when they are coupled out of the optical waveguide.

[0046] Please see Figure 3 In region (a), subregion K1 is the overlapping area of ​​the two image beams. Specifically, an image beam of a certain size is modulated in the coupling region, propagates within the optical waveguide via total internal reflection, and finally exits through multiple pupil dilations in the output region. The distance of a single total internal reflection is less than or equal to the size of the image beam. That is, in the eye box region of the output region, the light spots corresponding to the image beams intersect or are tangent, ensuring that the human eye can receive the image beam corresponding to the field of view within a certain range within the eye box.

[0047] However, if the image light from a certain field of view does not intersect during pupil expansion within the optical waveguide, then when the human eye receives that image light at a certain position, it may lack image information from that field of view. Please refer to [link / reference]. Figure 3 In region (b), subregion K2 is the field-of-view missing region between the two image lights.

[0048] To avoid the problem of missing field of view, optical waveguides in related technologies typically employ the optical path design in region (a). However, the inventors of this application have discovered through research that, as shown in sub-region K1, adjacent image lights have the same coupling angle and overlap position when they are coupled out, and the optical path difference between them is small, making it very easy to meet the conditions for interference. In this case, if the human eye observes the image light in this region, it is highly likely to see interference fringes, thereby affecting the display effect of the AR device.

[0049] Therefore, in order to reduce the aforementioned interference fringes, the inventors of this application proposed the light-emitting device 100 in this application. By having two beams that do not meet the interference conditions (i.e., the first beam A1 and the second beam A2) intersect each other during pupil expansion, the probability of interference fringes can be reduced while avoiding field of view loss, thereby improving the display effect of the augmented reality device 200 equipped with the light-emitting device 100.

[0050] The specific implementation of the light-emitting device 100 is explained below.

[0051] In this embodiment, the laser module 120 is used to generate a first beam A1 and a second beam A2. As an example, the first beam A1 and the second beam A2 can be beams carrying image information, such as beams modulated by a spatial light modulator, so that the user can see the image information generated by the AR device within the eye box. As another example, the first beam A1 and the second beam A2 can be illumination beams, which may not carry image information; in this case, the optical waveguide module 140 can be used as a light source. It is easy to understand that if the first beam A1 and the second beam A2 do not overlap during pupil dilation, the user will see black lines or stripes within the eye box, affecting the display effect of the AR device. In the following description, the example of the first beam A1 and the second beam A2 carrying image information will be used.

[0052] In one implementation, the polarization states of the first beam A1 and the second beam A2 are orthogonal, so that the conditions for interference are not met between the first beam A1 and the second beam A2. As an example, one of the first beam A1 and the second beam A2 can be P-polarized light, and the other can be S-polarized light. As another example, one of the first beam A1 and the second beam A2 can be left-handed circularly polarized light, and the other can be right-handed circularly polarized light.

[0053] Please see Figure 4 The laser module 120 may include a laser unit 1210, an optical modulation unit 1230, and a beam splitting unit 1250. The laser unit 1210 emits a first laser beam L1. As an example, the first laser beam L1 may be monochromatic light, and the laser unit 1210 may include a single laser generator. As another example, the first laser beam L1 may also be a mixed beam emitted sequentially from multiple monochromatic lights (e.g., red, green, and blue light) in a fixed time sequence. The laser unit 1210 may include multiple laser generators and beam combiners (e.g., dichroic filters, mirrors, etc.). This embodiment does not specifically limit the implementation of the laser unit 1210.

[0054] In this embodiment, the optical modulation unit 1230 may include an optical modulator 1232 and a projection lens 1234. The optical modulator 1232 is disposed in the optical path of the first laser beam L1 and is used to modulate the first laser beam L1 to form a second laser beam L2 carrying an image. Specifically, the optical modulation unit 1230 may be a spatial light modulator (SLM), liquid crystal on silicon (LCoS), digital micromirror device (DMD), micro-LED, etc., and this embodiment does not impose a specific limitation.

[0055] The projection lens 1234 is disposed between the light modulator 1232 and the beam splitter 1250, and is located in the optical path of the second laser beam L2. It is used to adjust the focal length and field of view of the image and optimize optical performance (e.g., reduce distortion, improve contrast and brightness, control chromatic aberration, etc.). Specifically, the projection lens 1234 may include multiple projection lenses, wherein the projection lenses may be positive lenses or negative lenses; the projection lenses may be spherical lenses or aspherical lenses, and this embodiment does not make specific limitations.

[0056] In this embodiment, the beam splitting unit 1250 is disposed between the optical modulation unit 1230 and the optical waveguide module 140, and is located in the optical path of the second laser beam L2. The beam splitting unit 1250 is used to split the second laser beam L2 into a first beam A1 and a second beam A2. Specifically, the beam splitting unit 1250 is disposed between the light-emitting side of the projection lens 1234 and the optical waveguide module 140, and is also used to change the polarization state of a portion of the second laser beam L2 so that it is orthogonal to the polarization state of another portion of the second laser beam L2.

[0057] In this embodiment, the second laser beam L2 is linearly polarized light. Specifically, the second laser beam L2 can be either S-polarized light or P-polarized light.

[0058] In some possible embodiments, such as Figure 4As shown, the beam splitting unit 1250 may include a first quarter-wave plate 1251 and a second quarter-wave plate 1252. The first quarter-wave plate 1251 is disposed in the optical path containing a portion of the second laser beam L2, and this portion of the second laser beam L2 exits through the first quarter-wave plate 1251 to form a first beam A1. The second quarter-wave plate 1252 is disposed in the optical path containing the other portion of the second laser beam L2, and this other portion of the second laser beam L2 exits through the second quarter-wave plate 1252 to form a second beam A2. Specifically, one of the first beam A1 and the second beam A2 is left-handed circularly polarized light, and the other is right-handed circularly polarized light; that is, their polarization states are orthogonal.

[0059] Specifically, the first quarter-wave plate 1251 and the second quarter-wave plate 1252 can bisect the light spot corresponding to the second laser beam L2, so that the energies corresponding to the first beam A1 and the second beam A2 are approximately equal. For example, the planes corresponding to the first quarter-wave plate 1251 and the second quarter-wave plate 1252 are both perpendicular to the second laser beam L2, and the first quarter-wave plate 1251 and the second quarter-wave plate 1252 are joined together to form a mating surface (not shown in the figure), which is located on the optical axis corresponding to the second laser beam L2.

[0060] In some other possible embodiments, please refer to Figure 5 The beam splitting unit 1250 may include a waveplate 1253 and a light-transmitting plate 1254. The waveplate 1253 is disposed in the optical path containing a portion of the second laser beam L2, and the portion of the second laser beam L2 exits through the waveplate 1253 to form the first beam A1. The light-transmitting plate 1254 may be a flat glass plate, which is disposed in the optical path containing the other portion of the second laser beam L2, and the other portion of the second laser beam L2 exits through the light-transmitting plate 1254 to form the second beam A2. One of the first beam A1 and the second beam A2 is P-polarized light, and the other is S-polarized light; that is, their polarization states are orthogonal.

[0061] Specifically, the half-wave plate 1253 and the light-transmitting plate 1254 can bisect the light spot corresponding to the second laser beam L2, so that the energies corresponding to the first beam A1 and the second beam A2 are approximately equal. For example, the planes corresponding to the half-wave plate 1253 and the light-transmitting plate 1254 are both perpendicular to the second laser beam L2, and the half-wave plate 1253 and the light-transmitting plate 1254 are joined together to form a bonding surface (not shown in the figure), which is located on the optical axis corresponding to the second laser beam L2.

[0062] As an example, the half-wave plate 1253 and the light-transmitting plate 1254 have the same thickness to ensure that the optical path of the subsequent first beam A1 and the second beam A2 are equal, thus avoiding affecting the light output effect of the projection lens 1234.

[0063] As another example, the beam splitter 1250 may not have a light-transmitting plate 1254, so that another part of the second laser beam L2 is directly incident on the optical waveguide module 140 as the second beam A2, thereby reducing the hardware cost of the light output device 100.

[0064] In some other possible embodiments, please refer to Figure 6 The beam splitting unit 1250 may include a third quarter-wave plate 1255 and a polarizing beam splitter 1256. The third quarter-wave plate 1255 and the polarizing beam splitter 1256 are sequentially arranged in the optical path of the second laser beam L2, so that the second laser beam L2 is incident on the polarizing beam splitter 1256 after passing through the third quarter-wave plate 1255.

[0065] Since the second laser beam L2 is linearly polarized, under the action of the third quarter-wave plate 1255, the second laser beam L2 will be converted into circularly polarized light. This causes a portion of the second laser beam L2 to be reflected by the polarizing beam splitter 1256 to form the first beam A1, while the other portion is transmitted through the polarizing beam splitter 1256 to form the second beam A2. One of the first beam A1 and the second beam A2 is P-polarized light, and the other is S-polarized light; that is, their polarization states are orthogonal.

[0066] Taking the polarizing beam splitter 1256 as an example of transmitting P-polarized light and reflecting S-polarized light, the S-polarized light component in the second laser beam L2 (that is, a part of the second laser beam L2) will be reflected by the polarizing beam splitter 1256, while the P-polarized light component in the second laser beam L2 (that is, another part of the second laser beam L2) will be transmitted by the polarizing beam splitter 1256 to form the first beam A1 and the second beam A2 respectively.

[0067] In some examples, such as Figure 6 As shown, the beam splitting unit 1250 may further include a reflector 1257, which is disposed in the optical path of the first beam A1 emitted via the polarizing beam splitter 1256. The reflector 1257 reflects the first beam A1 so that the propagation directions of the first beam A1 and the second beam A2 are the same, reducing the difficulty of subsequent coupling into the optical waveguide module 140. As an example, the reflector 1257 may be... Figure 6 The reflecting prism in the image can be attached to the polarizing beam splitter 1256 to make the overall optical path of the beam splitter 1250 more compact and reasonable. As another example, the reflector 1257 can be a plane mirror, but this embodiment does not impose a specific limitation.

[0068] In another implementation, the optical path difference between the first beam A1 and the second beam A2 is greater than the coherence length of the laser, so that the conditions for forming interference between the first beam A1 and the second beam A2 are not met.

[0069] Please see Figure 7 The laser module 120 may include a laser unit 1210, an optical path modulation unit 1220, and an optical modulation unit 1230. The laser unit 1210 is used to emit a first laser beam L1. For details regarding the laser unit 1210, please refer to the specific description in the embodiments above; further details will not be provided here.

[0070] An optical path modulation unit 1220 is disposed in the optical path of the first laser beam L1, and is used to modulate the first laser beam L1 into a mixed beam of at least two sub-beams L11. The optical path difference between any two sub-beams L11 is greater than the coherence length of the first laser beam L1.

[0071] In some possible embodiments, such as Figure 7 As shown, the optical path modulation unit 1220 may include a partitioned phase plate 1221 and a first fiber unit 1222. The partitioned phase plate 1221 is disposed on the optical path of the first laser beam L1, and may include multiple phase delay regions (not shown in the figure). Each phase delay region is used to delay the phase of the incident beam to form a sub-beam L11. Any two sub-beams L11 have different phases. For example, the partitioned phase plate 1221 may employ a radial partitioning method, with multiple phase delay regions arranged sequentially in a one-dimensional direction. Specifically, the number of phase delay regions is at least two.

[0072] Specifically, when the phase difference between any two sub-beams L11 is converted into an optical path difference, this optical path difference is greater than the coherence length of the first laser beam L1. The conversion formula is as follows: ,in, For phase difference, For optical path difference, The center wavelength of the first laser beam L1 is given. Therefore, the first laser beam L1 emitted by the partition phase plate 1221 includes at least two beam components with different optical paths.

[0073] The first fiber unit 1222 may include a plurality of first sub-fibers 1223, each corresponding to a plurality of phase delay regions. Each first sub-fiber 1223 is disposed on the optical path of a sub-beam L11 and is used to couple the sub-beam L11 to the optical modulation unit 1230. Specifically, the first fiber unit 1222 may be a multi-core fiber, with each core corresponding to one first sub-fiber 1223, and the lengths of the plurality of first sub-fibers 1223 may be equal.

[0074] In some examples, such as Figure 7 As shown, the optical path modulation unit 1220 may further include a first lens 1224. The first lens 1224 is located between the laser unit 1210 and the partitioned phase plate 1221, and is located in the optical path of the first laser beam L1. It is used to collimate the first laser beam L1 so that the first laser beam L1 can be smoothly incident on the partitioned phase plate 1221. Specifically, the first lens 1224 may be a positive lens (e.g., a biconvex lens, a plano-convex lens, etc.), and the number of first lenses 1224 may be one or more, which is not limited in this embodiment.

[0075] In other possible embodiments, such as Figure 8 As shown, the optical path modulation unit 1220 may include a second optical fiber unit 1225. The second optical fiber unit 1225 may include multiple second sub-optical fibers 1226, each sub-optical fiber being disposed in the optical path of a portion of the first laser beam L1 to form a sub-beam L11, which is then coupled out to the optical modulation unit 1230. The lengths of the multiple second sub-optical fibers 1226 are all different. Specifically, each fiber core of the second optical fiber unit 1225 corresponds to one second sub-optical fiber 1226. Therefore, in this embodiment, different lengths of fiber cores are used to change the optical path difference of the sub-beam L11 to reduce the possibility of subsequent interference.

[0076] In some examples, such as Figure 8 As shown, the optical path modulation unit 1220 may further include a second lens 1227. The second lens 1227 is located between the laser unit 1210 and the second fiber unit 1225, and is located in the optical path of the first laser beam L1. It is used to collimate the first laser beam L1 so that the first laser beam L1 can be smoothly coupled into the second fiber unit 1225. Specifically, the second lens 1227 may be a positive lens (e.g., a biconvex lens, a plano-convex lens, etc.), and the number of second lenses 1227 may be one or more, which is not limited in this embodiment.

[0077] exist Figure 7 and Figure 8In the illustrated embodiment, the optical modulation unit 1230 is disposed between the optical path modulation unit 1220 and the optical waveguide module 140, and is located on the optical path of the first laser beam L1. It is used to modulate the first laser beam L1 to form a second laser beam L2 carrying an image. Part of the second laser beam L2 is the first beam A1, and the other part of the second laser beam L2 is the second beam A2.

[0078] In other words, in this embodiment, the first beam A1 and the second beam A2 are each a portion of the second laser beam L2. Since the first laser beam L1 includes at least two beam components with different optical paths, the second laser beam L2 formed after modulation also includes at least two beam components with different optical paths, thereby ensuring that the conditions for interference between the first beam A1 and the second beam A2 are not met.

[0079] Specifically, for details regarding the optical modulation unit 1230, please refer to the detailed description in the embodiments above in the specification, which will not be repeated here.

[0080] In another implementation, the center wavelengths of the first beam A1 and the second beam A2 are different, so that the conditions for interference are not met between the first beam A1 and the second beam A2.

[0081] Please see Figure 9 The laser module 120 may include a laser unit 1210 and an optical modulation unit 1230. The laser unit 1210 may include a first laser subunit 1212 and a second laser subunit 1214. The first laser subunit 1212 emits a first laser sub-beam L12, and the second laser subunit 1214 emits a second laser sub-beam L13. The center wavelengths of the first laser sub-beam L12 and the second laser sub-beam L13 are different, but this embodiment does not limit this. Specifically, the first laser subunit 1212 and the second laser subunit 1214 may be two independent laser generators, such as a semiconductor laser generator, a solid-state laser generator, etc.

[0082] An optical modulation unit 1230 is disposed in the optical path containing the first laser sub-beam L12 and the second laser sub-beam L13. It modulates the first laser sub-beam L12 to form a first beam A1 and modulates the second laser sub-beam L13 to form a second beam A2. Since the center wavelengths of the first laser sub-beam L12 and the second laser sub-beam L13 are different, the center wavelengths of the first beam A1 and the second beam A2 are also different. Specifically, the optical modulation unit 1230 may include an optical modulator 1232 and a projection lens 1234. For details regarding the optical modulator 1232 and the projection lens 1234, please refer to the specific descriptions in the embodiments above; further elaboration is omitted here.

[0083] As an example, the first laser sub-beam L12 and the second laser sub-beam L13 can be incident on the same optical modulator 1232 at different angles, so that the first beam A1 and the second beam A2 emitted from the optical modulator 1232 are also incident on the projection lens 1234 at different angles, so that the projection lens 1234 can emit two beams respectively.

[0084] As another example, there can be two optical modulators 1232 and two projection lenses 1234, one of which is used to modulate the first laser sub-beam L12 to form the first beam A1; the other is used to modulate the second laser sub-beam L13 to form the second beam A2.

[0085] In this embodiment, the optical waveguide module 140 is disposed in the optical path where the first beam A1 and the second beam A2 are located, and is used to couple the first beam A1 and the second beam A2 to the human eye so that the user can see the projected image contained in the beam.

[0086] In some possible embodiments, please refer again. Figure 2 The optical waveguide module 140 may include a first optical waveguide 1410 and a second optical waveguide 1420 stacked together. The first optical waveguide 1410 is located between the laser module 120 and the second optical waveguide 1420, and is positioned opposite to the user's eye. Specifically, the first optical waveguide 1410 may be a surface relief grating waveguide (SRG), a volumetric holographic grating waveguide (VHG), etc., and this embodiment does not impose a specific limitation.

[0087] The first optical waveguide 1410 is provided with a first coupling-in region 1401 and a coupling-out region 1405, which are located on the same side of the first optical waveguide 1410. Specifically, the optical waveguide module 140 may further include a first coupling-out grating 1430 and a first coupling-in grating 1450, which are respectively disposed on the first optical waveguide 1410. The first coupling-out grating 1430 is used to couple the first beam A1 to the coupling-out region 1405, and the first coupling-in grating 1450 is used to couple the first beam A1 into the first optical waveguide 1410 so that the first beam A1 undergoes total internal reflection.

[0088] exist Figure 2In the illustrated embodiment, both the first output grating 1430 and the first input grating 1450 are located on the side of the first optical waveguide 1410 opposite to the output region 1405. That is, both the first output grating 1430 and the first input grating 1450 are reflection diffraction gratings. Of course, in other possible embodiments, the first output grating 1430 can also be a transmission diffraction grating, located on the side where the output region 1405 is located; the first input grating 1450 can also be a transmission diffraction grating, located on the side where the output region 1405 is located.

[0089] It should be noted that during multiple total internal reflections of the first beam A1 within the first optical waveguide 1410 in this embodiment, the multiple light spots located on the same side of the first optical waveguide 1410 do not overlap. Therefore, when the first beam A1 undergoes pupil-expanding coupling at the first coupling grating 1430, the multiple first pupil-expanding light spots S1 formed are also non-overlapping, thereby reducing the probability of interference between multiple first beams A1 at the coupling region 1405. Specifically, researchers can achieve the above effect by designing the optical parameters of the first coupling grating 1450 (e.g., the exit angle of the beam after reflection from the first coupling grating 1450).

[0090] exist Figure 2 In the illustrated embodiment, the second optical waveguide 1420 is located on the side of the first optical waveguide 1410 away from the laser module 120. Specifically, the second optical waveguide 1420 can be a surface relief grating waveguide (SRG), a volume holographic grating waveguide (VHG), etc., and this embodiment does not impose any specific limitations.

[0091] The second optical waveguide 1420 is provided with a second coupling region 1403, which is located on the side of the second optical waveguide 1420 facing the first optical waveguide 1410. Specifically, the optical waveguide module 140 may further include a second output grating 1440 and a second coupling grating 1460, which are respectively disposed in the second optical waveguide 1420. The second output grating 1440 is used to couple the second beam A2 to the output region 1405, and the second coupling grating 1460 is used to couple the second beam A2 into the second optical waveguide 1420 so that the second beam A2 undergoes total internal reflection.

[0092] exist Figure 2In the illustrated embodiment, both the second output grating 1440 and the second input grating 1460 are located on the side of the second optical waveguide 1420 away from the output region 1405. That is, both the second output grating 1440 and the second input grating 1460 are reflective diffraction gratings. Of course, in other possible embodiments, the second output grating 1440 can also be a transmission diffraction grating, located on the side of the second optical waveguide 1420 near the output region 1405; the second input grating 1460 can also be a transmission diffraction grating, located on the side of the second optical waveguide 1420 near the output region 1405.

[0093] It should be noted that during multiple total internal reflections of the second beam A2 within the second optical waveguide 1420 in this embodiment, the multiple light spots located on the same side of the second optical waveguide 1420 do not overlap. Therefore, when the second beam A2 undergoes pupil-expanding coupling at the second coupling grating 1440, the multiple second pupil-expanding light spots S2 formed are also non-overlapping, thereby reducing the probability of interference between multiple second beams A2 at the coupling region 1405. Specifically, researchers can achieve the above effect by designing the optical parameters of the second coupling grating 1460 (e.g., the exit angle of the beam after reflection from the second coupling grating 1460).

[0094] In some possible embodiments, the projections of the first coupling region 1401 and the second coupling region 1403 on a specified direction X are spaced apart. Here, the specified direction X is the coupling direction of the first beam A1. Because there is a certain gap between the first coupling region 1401 and the second coupling region 1403, it can be ensured that at the coupling region 1405, multiple first pupil-expanding spots S1 and multiple second pupil-expanding spots S2 can be arranged in an alternating pattern, and adjacent first pupil-expanding spots S1 and second pupil-expanding spots S2 partially overlap, thus avoiding the problem of field-of-view loss.

[0095] It should be noted that in some possible examples, there is no gap between the first beam A1 and the second beam A2 emitted by the laser module 120. For example, using... Figure 4 , Figure 5 , Figures 7 to 9 The embodiment corresponding to the laser module 120. In this case, the optical waveguide module 140 may further include a mirror array (not shown in the figure), which is disposed between the laser module 120 and the first optical waveguide 1410, and located on the optical path of at least one of the first beam A1 and the second beam A2. It is used to guide the first beam A1 to the first coupling region 1401, and / or guide the second beam A2 to the second coupling region 1403, so as to ensure that the first beam A1 and the second beam A2 can be smoothly coupled into the optical waveguide module 140.

[0096] In some other possible embodiments, the projections of the first coupling region 1401 and the second coupling region 1403 onto a specified direction X are adjacent. Here, the specified direction X is the coupling direction of the first beam A1. In this case... Figure 4 , Figure 5 , Figures 7 to 9 The first beam A1 and the second beam A2 generated by the laser module 120 can be successfully coupled into the corresponding coupling region.

[0097] Specifically, the thickness of the first optical waveguide 1410 is less than the thickness of the second optical waveguide 1420, which can avoid the phenomenon of the light spot of the first beam A1 in the first optical waveguide 1410 and the light spot of the second beam A2 in the second optical waveguide 1420 being tangent. As a result, at the coupling region 1405, the multiple first pupil dilation spots S1 and the multiple second pupil dilation spots S2 cannot be arranged in an alternating manner, thereby avoiding the problem of field of view loss.

[0098] In some possible embodiments, the polarization state of the first beam A1 is a first polarization state, and the polarization state of the second beam A2 is a second polarization state, with the first and second polarization states being orthogonal. For example, this can be achieved by... Figures 4 to 6 The embodiment corresponding to the laser module 120. For example, the first polarization state can be an S-polarization state, and the second polarization state can be a P-polarization state.

[0099] Specifically, the first coupling grating 1430 is a grating sensitive to the first polarization state, and the second coupling grating 1440 is a grating sensitive to the second polarization state. In this case, the second beam A2 can be prevented from being coupled into the first optical waveguide 1410 under the action of the first coupling grating 1430, so as to ensure that the second beam A2 is successfully coupled out.

[0100] As an example, the first beam A1 and the second beam A2 can be monochromatic light, and both have the same color.

[0101] As another example, the first beam A1 and the second beam A2 can be colored light to enhance the user experience. For example, the first beam A1 and the second beam A2 may contain red light, green light, and blue light, respectively. In this case, the optical waveguide module 140 may also include a third optical waveguide, a fourth optical waveguide, a fifth optical waveguide, and a sixth optical waveguide (all not shown in the figure), wherein the first optical waveguide 1410, the second optical waveguide 1420, the third optical waveguide, the fourth optical waveguide, the fifth optical waveguide, and the sixth optical waveguide are stacked sequentially.

[0102] Specifically, the first optical waveguide 1410 and the second optical waveguide 1420 can couple out the red light components of the first beam A1 and the second beam A2, respectively; the third and fourth optical waveguides can couple out the green light components of the first beam A1 and the second beam A2, respectively; and the fifth and sixth optical waveguides can couple out the blue light components of the first beam A1 and the second beam A2, respectively. For details on the implementation of the third and fourth optical waveguides, please refer to the relevant descriptions of the first and second optical waveguides 1410 and 1420, respectively; the implementation of the fifth and sixth optical waveguides will not be repeated here.

[0103] In some other possible embodiments, please refer to Figure 10 The first beam A1 has a first polarization state, and the second beam A2 has a second polarization state; the first and second polarization states are orthogonal. For example, it can be used... Figures 4 to 6 The embodiment corresponding to the laser module 120. For example, the first polarization state can be an S-polarization state, and the second polarization state can be a P-polarization state.

[0104] The optical waveguide module 140 may include a third optical waveguide 1470, which may be a surface relief grating waveguide (SRG), a volume holographic grating waveguide (VHG), etc., and is not specifically limited in this embodiment. The first coupling region 1401, the second coupling region 1403, and the coupling out region 1405 are located on the same side of the third optical waveguide 1470.

[0105] exist Figure 10 In the illustrated embodiment, the optical waveguide module 140 may further include a third output grating 1480, a third input grating 1491, and a fourth input grating 1492, which are respectively disposed in the third optical waveguide 1470. Specifically, the third output grating 1480 is used to couple the first beam A1 and the second beam A2 to the output region 1405; the third input grating 1491 is used to couple the first beam A1 into the third optical waveguide 1470 to achieve total internal reflection of the first beam A1; and the fourth input grating 1492 is used to couple the second beam A2 into the third optical waveguide 1470 to achieve total internal reflection of the second beam A2.

[0106] exist Figure 10In the illustrated embodiment, the third output grating 1480, the third input grating 1491, and the fourth input grating 1492 are all located on the side of the third optical waveguide 1470 opposite to the output region 1405. That is, the third output grating 1480, the third input grating 1491, and the fourth input grating 1492 are all reflection diffraction gratings. Of course, in other possible embodiments, the third output grating 1480 can also be a transmission diffraction grating, located on the side where the output region 1405 is located; the third input grating 1491 can also be a transmission diffraction grating, located on the side where the output region 1405 is located; and the fourth input grating 1492 can also be a transmission diffraction grating, located on the side where the output region 1405 is located.

[0107] As an example, such as Figure 10 As shown, the first coupling region 1401 is located between the second coupling region 1403 and the coupling region 1405. The third coupling grating 1491 can be a grating sensitive to the first polarization state, which can avoid the problem of the second beam A2 being coupled out through the third coupling grating 1491 when it is reflected to the position of the third coupling grating 1491, so as to ensure that the second beam A2 can be coupled out smoothly from the coupling region 1405.

[0108] As another example, the second coupling region 1403 is located between the first coupling region 1401 and the coupling region 1405. The fourth coupling grating 1492 can be a second polarization state sensitive grating, which can avoid the problem of the first beam A1 being coupled out through the fourth coupling grating 1492 when it is reflected to the location of the fourth coupling grating 1492, so as to ensure that the first beam A1 can be coupled out smoothly from the coupling region 1405.

[0109] This application provides a light-emitting device 100 and an augmented reality device 200 equipped with the light-emitting device 100. The light-emitting device 100 may include a laser module 120 and an optical waveguide module 140. The laser module 120 is used to generate a first beam A1 and a second beam A2, and the first beam A1 and the second beam A2 do not meet the conditions for forming interference.

[0110] In this embodiment, the optical waveguide module 140 is provided with a first coupling region 1401, a second coupling region 1403, and a coupling out region 1405. A first beam A1 is coupled into the optical waveguide module 1401 and coupled out through the coupling out region 1405. A second beam A2 is coupled into the optical waveguide module 1403 and coupled out through the coupling out region 1405. The first beam A1 expands its pupil at the coupling out region 1405 to form multiple first expanded pupil spots S1; the second beam A2 expands its pupil at the coupling out region 1405 to form multiple second expanded pupil spots S2.

[0111] On the one hand, the multiple first pupil-expanding light spots S1 in this application do not overlap with each other. That is to say, the light spots formed by the multiple reflections of the first beam A1 in the optical waveguide module 140 are staggered with each other. This can increase the optical path difference between the multiple first beams A1 formed after pupil expansion, thereby reducing the probability of interference between the multiple first beams A1 at the coupling region 1405, and thus reducing the probability of interference fringes appearing. This can improve the display effect of the augmented reality device 200 equipped with the light-emitting device 100.

[0112] Similarly, it can be seen that the multiple second pupil-expanding light spots S2 do not overlap with each other. That is to say, the light spots formed by the multiple reflections of the second beam A2 in the optical waveguide module 140 are staggered with each other. This can increase the optical path difference between the multiple second beams A2 formed after pupil expansion, thereby reducing the probability of interference of the multiple second beams A2 at the coupling region 1405, and thus reducing the probability of interference fringes appearing. This can improve the display effect of the augmented reality device 200 equipped with the light-emitting device 100.

[0113] On the other hand, at the coupling region 1405, a plurality of first pupil-expanding light spots S1 and a plurality of second pupil-expanding light spots S2 are arranged alternately, and adjacent first pupil-expanding light spots S1 and second pupil-expanding light spots S2 partially overlap. Since the conditions for interference are not met between the first beam A1 and the second beam A2, adjacent first beam A1 and second beam A2 at the coupling region 1405 will not interfere, thereby improving the display effect of the augmented reality device equipped with the light-emitting device 100.

[0114] Furthermore, since the adjacent first pupil beam S1 and second pupil beam S2 partially overlap, it can be ensured that the multiple first beams A1 and multiple second beams A2 at the coupling region 1405 intersect, which can avoid the occurrence of field of view loss in the augmented reality device 200, thereby ensuring that the human eye can receive the beams within the eye box, so as to ensure the user's viewing experience.

[0115] In this application specification, certain terms are used to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem within a certain margin of error and basically achieve the technical effect.

[0116] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application 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.

[0117] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0119] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A light-emitting device, characterized in that, include: A laser module is used to generate a first beam and a second beam; the first beam and the second beam do not meet the conditions for interference. as well as An optical waveguide module is provided with a first coupling region, a second coupling region, and a coupling out region. A first light beam is coupled into the first coupling region and coupled out through the coupling out region; a second light beam is coupled into the second coupling region and coupled out through the coupling out region; the first light beam is pupil-expanded at the coupling out region to form a plurality of first pupil-expanded light spots; the second light beam is pupil-expanded at the coupling out region to form a plurality of second pupil-expanded light spots. Among them, the multiple first pupil dilation spots do not overlap with each other, and the multiple second pupil dilation spots do not overlap with each other; at the coupling region, the multiple first pupil dilation spots and the multiple second pupil dilation spots are arranged alternately, and adjacent first pupil dilation spots and second pupil dilation spots partially overlap.

2. The light-emitting device according to claim 1, characterized in that, The laser module includes a laser unit, an optical modulation unit, and a beam splitting unit; wherein, the laser unit is used to emit a first laser beam; The optical modulation unit is disposed in the optical path of the first laser beam and is used to modulate the first laser beam to form a second laser beam carrying an image. The beam splitting unit is disposed between the optical modulation unit and the optical waveguide module, and is located on the optical path of the second laser beam. The beam splitting unit is used to split the second laser beam into the first beam and the second beam; wherein the polarization states of the first beam and the second beam are orthogonal.

3. The light-emitting device according to claim 2, characterized in that, The second laser beam is linearly polarized light. The beam splitting unit includes a first quarter-wave plate and a second quarter-wave plate. The first quarter-wave plate is disposed on a portion of the optical path containing the second laser beam to form the first beam. The second quarter-wave plate is disposed on the other portion of the optical path containing the second laser beam to form the second beam. One of the first beam and the second beam is left-handed circularly polarized light, and the other is right-handed circularly polarized light. The second laser beam is linearly polarized light. The beam splitting unit includes a half-wave plate and a light-transmitting plate. The half-wave plate is disposed in the optical path of a portion of the second laser beam to form the first beam. The light-transmitting plate is disposed in the optical path of another portion of the second laser beam to form the second beam. Among them, one of the first beam and the second beam is P-polarized light and the other is S-polarized light.

4. The light-emitting device according to claim 2, characterized in that, The second laser beam is linearly polarized light, and the beam splitting unit includes a third quarter-wave plate and a polarizing beam splitter prism; The third quarter-wave plate and the polarizing beam splitter are sequentially arranged in the optical path of the second laser beam; a portion of the second laser beam is reflected by the polarizing beam splitter to form the first beam, and another portion of the second laser beam is transmitted through the polarizing beam splitter to form the second beam; In this beam, one of the first beam and the second beam is P-polarized light, and the other is S-polarized light.

5. The light-emitting device according to claim 1, characterized in that, The laser module includes a laser unit, an optical path modulation unit, and an optical modulation unit; wherein, the laser unit is used to emit a first laser beam; The optical path modulation unit is disposed on the optical path of the first laser beam and is used to modulate the first laser beam into a mixed beam of at least two sub-beams; wherein the optical path difference between any two sub-beams is greater than the coherence length of the first laser beam. The optical modulation unit is disposed between the optical path modulation unit and the optical waveguide module, and is located on the optical path of the first laser beam. It is used to modulate the first laser beam to form a second laser beam carrying an image. A portion of the second laser beam is the first beam, and another portion of the second laser beam is the second beam.

6. The light-emitting device according to claim 5, characterized in that, The optical path modulation unit includes a partitioned phase plate and a first optical fiber unit; The partitioned phase plate is disposed in the optical path of the first laser beam. The partitioned phase plate includes multiple phase delay regions. Each phase delay region is used to delay the phase of the incident beam to form one sub-beam. The phases of any two sub-beams are different. The first optical fiber unit includes a plurality of first sub-optical fibers, which correspond to a plurality of phase delay regions; wherein each first sub-optical fiber is disposed on the optical path of one of the sub-beams and is used to couple the sub-beams to the optical modulation unit.

7. The light-emitting device according to claim 5, characterized in that, The optical path modulation unit includes a second optical fiber unit; The second optical fiber unit includes a plurality of second sub-optical fibers, each of which is disposed in the optical path of a portion of the first laser beam to form a sub-beam and couple the sub-beam to the optical modulation unit; wherein the lengths of the plurality of second sub-optical fibers are different.

8. The light-emitting device according to claim 1, characterized in that, The laser module includes a laser unit and an optical modulation unit; wherein, the laser unit includes a first laser subunit and a second laser subunit, the first laser subunit is used to emit a first laser sub-beam, the second laser subunit is used to emit a second laser sub-beam, and the center wavelengths of the first laser sub-beam and the second laser sub-beam are different; The optical modulation unit is disposed in the optical path where the first laser sub-beam and the second laser sub-beam are located, and is used to modulate the first laser sub-beam to form the first beam, and to modulate the second laser sub-beam to form the second beam.

9. The light-emitting device according to claim 1, characterized in that, The optical waveguide module includes a first optical waveguide and a second optical waveguide stacked in phase; the first optical waveguide is located between the laser module and the second optical waveguide. The first optical waveguide is provided with a first coupling-in region and a coupling-out region, and the first coupling-in region and the coupling-out region are located on the same side of the first optical waveguide; The second optical waveguide is provided with the second coupling region, which is located on the side of the second optical waveguide facing the first optical waveguide.

10. The light-emitting device according to claim 9, characterized in that, The projections of the first coupling region and the second coupling region in a specified direction are spaced apart; wherein, the specified direction is the coupling direction of the first beam; or The projections of the first coupling region and the second coupling region in a specified direction are adjacent, and the thickness of the first optical waveguide is less than the thickness of the second optical waveguide; wherein, the specified direction is the coupling direction of the first beam.

11. The light-emitting device according to claim 9, characterized in that, The first beam has a first polarization state, the second beam has a second polarization state, and the first polarization state and the second polarization state are orthogonal. The optical waveguide module further includes a first coupling grating and a second coupling grating. The first coupling grating is disposed on the first optical waveguide and is used to couple the first beam to the coupling region. The first coupling grating is a grating sensitive to the first polarization state. The second coupling grating is disposed on the second optical waveguide and is used to couple the second beam to the coupling region; wherein the second coupling grating is a grating sensitive to the second polarization state.

12. The light-emitting device according to any one of claims 1 to 4, characterized in that, The first beam has a first polarization state, the second beam has a second polarization state, and the first polarization state and the second polarization state are orthogonal. The optical waveguide module includes a third optical waveguide, and the first coupling region, the second coupling region, and the coupling out region are located on the same side of the third optical waveguide.

13. An augmented reality device, characterized in that, include: case; as well as The light-emitting device as described in any one of claims 1 to 12, wherein the light-emitting device is disposed in the housing.

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