Near-to-eye display device

Abstract

The utility model provides a near-to-eye display device, and the device comprises a projection light machine which is configured to generate light; the first prism is located on the light emitting side of the projection light machine, the first prism is provided with a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface are connected to form an edge, the edge and the projection light machine are oppositely arranged, and the edge is configured to divide light into first split light and second split light; the first reflecting surface is configured to reflect the first split light, and the second reflecting surface is configured to reflect the second split light; the optical waveguide assembly is arranged on the light emitting side of the first prism, and the optical waveguide assembly is configured to receive the first split light and the second split light. The near-to-eye display device can reduce the interference of the projection light machine on a wearer.

Description

Technical Field

[0001] The utility model relates to the technical field of extended reality display, in particular to a near-eye display device. Background Art

[0002] AR technology, also known as augmented reality technology, relies on a near-eye display device for implementation. For example, AR glasses have become the most breakthrough star products in this field. The near-eye display technology implemented by the optical waveguide technology can significantly simplify the structure of the near-eye display device, reduce the weight and volume, and is of great significance to the commercialization and popularization of the near-eye display device.

[0003] In the currently common near-eye display devices, each waveguide lens corresponding to the wearer's each eye is respectively configured with a corresponding projection optical machine to project corresponding projection images to the two waveguide lenses respectively, so as to present a good display experience to the wearer. It can be seen that the number of projection optical machines is at least two, and the cost is relatively high; moreover, due to the relatively large size of the projection optical machine, and the projection optical machine cannot be too far away from the waveguide lens, this to a certain extent increases the difficulty of the assembly layout of the projection optical machine. Taking AR glasses as an example, the two projection optical machines are often placed at the positions of the two temple arms, which will block the left and right fields of view of the wearer and seriously affect the wearing experience.

[0004] Therefore, how to reduce the interference of the projection optical machine to the wearer has become a difficult problem. Summary of the Utility Model

[0005] An embodiment of the present application provides a near-eye display device, which can reduce the interference of the projection optical machine to the wearer.

[0006] An embodiment of the present application provides a near-eye display device, including:

[0007] A projection optical machine configured to generate light;

[0008] A first prism located on the light-emitting side of the projection optical machine. The first prism has a first reflection surface and a second reflection surface. The first reflection surface and the second reflection surface are connected to form an edge. The edge is disposed opposite to the projection optical machine. The edge is configured to divide the light into a first split light and a second split light. The first reflection surface is configured to reflect the first split light, and the second reflection surface is configured to reflect the second split light;

[0009] An optical waveguide assembly disposed on the light-emitting side of the first prism. The optical waveguide assembly is configured to receive the first split light and the second split light, and the first split light and the second split light propagate in the optical waveguide assembly in opposite directions.

[0010] In the near-eye display device provided by the embodiment of the present application, the near-eye display device includes a projection optical machine, a first prism, and an optical waveguide assembly. The projection optical machine is configured to generate light. The first prism is located on the light-emitting side of the projection optical machine. The first prism has a first reflection surface and a second reflection surface. The first reflection surface and the second reflection surface are connected to form an edge. The edge is disposed opposite to the projection optical machine. The edge is configured to divide the light into a first split light and a second split light. The first reflection surface is configured to reflect the first split light, and the second reflection surface is configured to reflect the second split light. The optical waveguide assembly is disposed on the light-emitting side of the first prism. The optical waveguide assembly is configured to receive the first split light and the second split light. The first split light and the second split light enter the left and right eyes of the wearer through the propagation of the optical waveguide assembly. It can be seen from this that the first prism can split the light emitted by the projection optical machine into two parts and enter the left and right eyes of the wearer respectively. In this way, the number of projection optical machines is reduced, the cost is reduced, and the volume of the near-eye display device is also correspondingly reduced. The installation position of the projection optical machine is changed from both sides of the wearer's head to between the two eyes of the wearer, which can effectively reduce the interference of the projection optical machine on the field of view and improve the user experience of the wearer. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is the first structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0013] Figure 2 It is the second structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0014] Figure 3 It is the third structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0015] Figure 4 It is the fourth structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0016] Figure 5 It is the fifth structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0017] Figure 6 It is the second structural schematic diagram of the first prism, the fourth prism, and the fifth prism provided by the embodiment of the present application.

[0018] Figure 7The sixth structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0019] Figure 8 The seventh structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0020] Figure 9 The eighth structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0021] Figure 10 The ninth structural schematic diagram of the near-eye display device provided by the embodiment of the present application. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0023] The embodiment of the present application provides a near-eye display device, which can reduce the interference of the projection optical machine to the wearer. The following is a specific description with reference to the accompanying drawings.

[0024] Please refer to Figure 1 and Figure 2 , Figure 1 The first structural schematic diagram of the near-eye display device provided by the embodiment of the present application, Figure 2 The second structural schematic diagram of the near-eye display device provided by the embodiment of the present application.

[0025] The embodiment of the present application provides a near-eye display device 100, which can superimpose the real scene and virtual information onto the same picture or space in real time, such as AR glasses.

[0026] The near-eye display device 100 at least includes a projection optical machine 10, a first prism 20, and an optical waveguide component 30. The projection optical machine 10 is configured to generate light. The first prism 20 is disposed on the light output side of the projection optical machine 10, and the optical waveguide component 30 is disposed on the light output side of the first prism 20.

[0027] The projection optical machine 10 can be one of a Micro LED optical machine, a DLP optical machine, an LCOS optical machine, and an LBS optical machine. The number of the projection optical machines 10 can be one, which is located in the middle of the near-eye display device 100, that is, between the eyes of the wearer.

[0028] The optical waveguide assembly 30 is used for imaging. On the one hand, it forms a virtual image in the distance from the pixels on the projection optical machine 10 and transmits it to the user's eyes. On the other hand, it transmits the light of the real scene to the user's eyes, that is, it combines the virtual image with the real scene.

[0029] The first prism 20 is configured to divide light into a first split light and a second split light, and reflect the first split light and the second split light into the optical waveguide assembly 30. The first split light and the second split light propagate in opposite directions within the optical waveguide assembly 30 and enter the human eye. For example, the first split light enters the user's left eye, and the second split light enters the user's right eye.

[0030] Wherein, the first prism 20 has a first reflection surface 21 and a second reflection surface 22. The first reflection surface 21 and the second reflection surface 22 are connected to form an edge 23. The edge 23 is disposed opposite to the optical waveguide assembly 30. The edge 23 is configured to divide light into a first split light and a second split light. The first reflection surface 21 is configured to reflect the first split light into the optical waveguide assembly 30, and the second reflection surface 22 is configured to reflect the second split light into the optical waveguide assembly 30.

[0031] It can be understood that the first prism 20 is a symmetric structure. The first reflection surface 21 and the second reflection surface 22 are symmetric with respect to the edge 23. Their effects on the first split light and the second split light are the same, and the acting directions are opposite and symmetric.

[0032] The first split light and the second split light enter the optical waveguide assembly 30 and will be transmitted within the optical waveguide assembly 30 along two opposite directions until they enter the left eye and the right eye of the wearer. For example, the first split light is transmitted within the optical waveguide assembly 30 along a first direction, and the second split light is transmitted within the optical waveguide assembly 30 along a second direction. The first direction is opposite to the second direction.

[0033] From this, it can be seen that the first prism 20 can split the light emitted from the projection optical machine 10 into two parts and enter the left eye and the right eye of the wearer respectively. In this way, the number of projection optical machines 10 is reduced (only one projection optical machine 10 is needed), the cost is reduced, and the volume of the near-eye display device 100 is also correspondingly reduced. The installation position of the projection optical machine 10 is changed from the two sides of the wearer's head to between the two eyes of the wearer, which can effectively reduce the interference of the projection optical machine 10 on the field of view and improve the user experience of the wearer.

[0034] In the first embodiment, please continue to refer to Figure 1, the projection optical machine 10 and the first prism 20 are respectively arranged on opposite sides of the optical waveguide component 30. For example, the optical waveguide component 30 has opposite first surface 311 and second surface 312. The projection optical machine 10 is located on one side of the first surface 311 of the optical waveguide component 30, and the first prism 20 is located on one side of the second surface 312 of the optical waveguide component 30. The projection optical machine 10 is arranged on one side of the first surface 311, and the first prism 20 is arranged on one side of the second surface 312. The light rays emitted by the projection optical machine 10 enter the optical waveguide component 30 from the first surface 311, then exit from the second surface 312 of the optical waveguide component 30 and are incident on the first prism 20, and are split into a first split light and a second split light by the first prism 20.

[0035] Please refer to Figure 3 , Figure 3 FIG. 3 is a schematic diagram of a third structure of the near-eye display device provided by the embodiment of the present application. In order to further support the first prism 20 and improve the stability of the relative position between the first prism 20 and the optical waveguide component 30, the near-eye display device 100 further includes a second prism 41 and a third prism 42. The second prism 41 is correspondingly arranged with the first reflection surface 21 of the first prism 20, and the third prism 42 is correspondingly arranged with the second reflection surface 22 of the first prism 20, so as to further provide support for the first prism 20, meet the condition that the included angles between the first side and the second side of the first prism 20 and the waveguide substrate 31 are the same, and realize the symmetry of the optical path. In addition, the second prism 41 and the third prism 42 can also protect the first reflection surface 21 and the second reflection surface 22 of the first prism 20.

[0036] The first prism 20 and the fourth prism 611, the fifth prism 612 can be fixed by using optical colloid or bonding process respectively.

[0037] Wherein, the side surface of the second prism 41 close to the optical waveguide component 30 is parallel to the plane where the optical waveguide component 30 is located, and the side surface of the third prism 42 close to the optical waveguide component 30 is parallel to the plane where the optical waveguide component 30 is located. For example, both the second prism 41 and the third prism 42 are parallel to the second surface 312 of the optical waveguide component 30 to ensure the stability of light ray transmission when the first split light and the second split light propagate in different media.

[0038] It can be understood that after the included angle formed by the first reflecting surface 21 and the plane where the optical waveguide component 30 is located is determined, and the side surface of the second prism 41 close to the optical waveguide component 30 is parallel to the plane where the optical waveguide component 30 is located, the first split light reflected by the first reflecting surface 21 passes through the second prism 41 and air in sequence and then enters the optical waveguide component 30. The transmission direction of the light when it enters the optical waveguide component 30 is still the same as or parallel to the direction of the first split light after being reflected by the first reflecting surface 21. Therefore, only by designing the included angle between the first reflecting surface 21 and the plane where the waveguide substrate 31 is located can it be determined whether total internal reflection can occur in the optical waveguide component 30. This will undoubtedly simplify the design of the optical path and avoid the generation of invalid optical paths. Since the third prism 42 is symmetrically arranged with the second prism 41, the third prism 42 also has the same effect and will not be elaborated here.

[0039] Among them, please refer to Figure 4 , Figure 4 which is the fourth structural schematic diagram of the near-eye display device provided by the embodiment of the present application. The optical waveguide component 30 and the first prism 20 can be fixed by using an optical colloid or a bonding process. When the optical waveguide component 30 and the first prism 20 are fixed by using an optical colloid, the near-eye display device 100 further includes a first colloid 51 and a second colloid 52. The first colloid 51 is disposed between the optical waveguide component 30 and the first reflecting surface 21 of the first prism 20, and the second colloid 52 is disposed between the optical waveguide component 30 and the second reflecting surface 22 of the first prism 20. The first colloid 51 and the second colloid 52 are used to fix the first prism 20 on the optical waveguide component 30, and the refractive index of the first colloid 51 and / or the second colloid 52 is approximately the same as the refractive index of the optical waveguide component 30.

[0040] In some other embodiments, please continue to refer to Figure 2 , the projection optical machine 10 and the first prism 20 are both disposed on the same side of the optical waveguide component 30. For example, the optical waveguide component 30 has opposite first surface 311 and second surface 312, and both the projection optical machine 10 and the first prism 20 are located on one side of the first surface 311 of the optical waveguide component 30, or both the projection optical machine 10 and the first prism 20 are located on one side of the second surface 312 of the optical waveguide component 30. The light emitted by the projection optical machine 10 enters the optical waveguide component 30 after being split and reflected by the first prism 20.

[0041] In order to further adjust the optical path to achieve the best display effect, please continue to refer to Figure 2 and Figure 5 , Figure 5This is the fifth schematic structural diagram of the near-eye display device provided by the embodiments of the present application. The near-eye display device 100 further includes a first reflection structure 61 and a second reflection structure 62. The first reflection structure 61 corresponds to the first reflection surface 21, and the second reflection structure 62 corresponds to the second reflection surface 22. The first light beam enters the optical waveguide assembly 30 after being reflected by the first reflection structure 61, and the second light beam enters the optical waveguide assembly 30 after being reflected by the second reflection structure 62.

[0042] It can be understood that in some cases, the light beam reflected by the first reflection structure 61 can be obliquely incident into the optical waveguide assembly 30, so that the incident angle between the light beam and the waveguide substrate 31 of the optical waveguide assembly 30 is greater than the critical angle of total reflection, so as to achieve total reflection propagation in the optical waveguide assembly 30. In other cases, the light beam reflected by the first reflection structure 61 can be vertically incident into the optical waveguide assembly 30. The optical waveguide assembly 30 includes a waveguide substrate 31 and an input grating 36, and the input grating 36 is disposed on the waveguide substrate 31. When the light beam reflected by the first reflection structure 61 is incident on the input grating 36 in the direction perpendicular to the waveguide substrate 31, under the action of the input grating 36, the light beam can be obliquely incident into the waveguide substrate 31, so that the incident angle between the light beam and the waveguide substrate 31 is greater than the critical angle of total reflection, so as to achieve total reflection propagation in the optical waveguide assembly 30. Similarly, since the second reflection structure 62 is symmetrically disposed with the first reflection structure 61, the second reflection structure 62 has the same function as the first reflection structure 61, and will not be described herein again.

[0043] It can be seen that the first reflection structure 61 and the second reflection structure 62 can change the optical path, so as to transmit as much light as possible into the input grating 36 or the waveguide substrate 31, and maximize the utilization rate of the light.

[0044] In one case, please continue to refer to Figure 5 , the first reflection structure 61 and / or the second reflection structure 62 is a reflection flat plate. The first reflection structure 61 is spaced apart from the first reflection surface 21, and the second reflection structure 62 is spaced apart from the second reflection surface 22. The first reflection structure 61 and / or the second reflection structure 62 being a reflection flat plate can effectively change the area of the light beam reflected by the first reflection structure 61 and / or the second reflection structure 62 onto the optical waveguide assembly 30, and can be adaptively changed according to the optical waveguide assembly 30.

[0045] In another case, please refer to Figure 2 and Figure 6 , Figure 6This is the second schematic structural diagram of the first prism, the fourth prism, and the fifth prism provided by the embodiments of the present application. The first reflection structure 61 is the fourth prism 611, and the fourth prism 611 has a third reflection surface 6111 and a fourth reflection surface 6112 that are parallel to each other. The third reflection surface 6111 is attached to the first reflection surface 21 of the first prism 20. The first beam splitting light enters the optical waveguide assembly 30 after being reflected by the third reflection surface 6111 and the fourth reflection surface 6112 in sequence.

[0046] On this basis, the second reflection structure 62 is the fifth prism 612, and the fifth prism 612 has a fifth reflection surface 6121 and a sixth reflection surface 6122 that are parallel to each other. The fifth reflection surface 6121 is attached to the second reflection surface 22 of the first prism 20. The second beam splitting light enters the optical waveguide assembly 30 after being reflected by the fifth reflection surface 6121 and the sixth reflection surface 6122 in sequence.

[0047] It can be understood that since the fourth prism 611 and the fifth prism 612 are respectively attached to the first prism 20, the first reflection surface 21 and the second reflection surface 22 of the first prism 20 can be protected from wear to avoid affecting the reflection effect.

[0048] In the above embodiment, please refer to Figure 7 , Figure 7 This is the sixth schematic structural diagram of the near-eye display device provided by the embodiments of the present application. In order to increase the reflection efficiency of light on the first reflection surface 21 and the second reflection surface 22 and avoid light being absorbed or refracted by the first prism 20, the near-eye display device 100 in the embodiments of the present application further includes a first reflection film 71 and a second reflection film 72. The first reflection film 71 is disposed on the first reflection surface 21, and the second reflection film 72 is disposed on the second reflection surface 22.

[0049] In the first embodiment, please continue to refer to Figure 3 , the above first reflection film 71 can be disposed between the first prism 20 and the second prism 41, and the second reflection film 72 can be disposed between the first prism 20 and the third prism 42. That is, the first reflection film 71 can be attached or plated on the first prism 20, or can be plated on the second prism 41, and the second reflection film 72 can be attached or plated on the second prism 41, or can be plated on the third prism 42.

[0050] In the second embodiment, please continue to refer to Figure 2, the above-mentioned first reflective film 71 can be disposed between the first prism 20 and the fourth prism 611, and the second reflective film 72 can be disposed between the first prism 20 and the fifth prism 612. That is, the first reflective film 71 can be attached or deposited on the first prism 20, or can be deposited on the fourth prism 611. The second reflective film 72 can be attached or deposited on the second prism 41, or can be deposited on the fifth prism 612.

[0051] In the above embodiment, please refer to Figures 8 to 10 , Figure 8 is the seventh schematic structural diagram of the near-eye display device provided by the embodiment of the present application, Figure 9 is the eighth schematic structural diagram of the near-eye display device provided by the embodiment of the present application, Figure 10 is the ninth schematic structural diagram of the near-eye display device provided by the embodiment of the present application. The optical waveguide assembly 30 at least includes a waveguide substrate 31, a first output grating 32, and a second output grating 33. The first output grating 32 and the second output grating 33 are disposed on the waveguide substrate 31. The projection optical machine 10 and the first prism 20 are respectively disposed on both sides of the waveguide substrate 31. The waveguide substrate 31 of the optical waveguide assembly 30 has the advantages of being thin and light, having high light transmittance, a large eye movement range, a large interpupillary distance, and a large viewing angle. The waveguide substrate 31 in the optical waveguide assembly 30 can be an integrated structure or a split structure. For example, the number of the waveguide substrates 31 can be two, corresponding to the two eyes of the wearer respectively.

[0052] In one case, the first beam splitting and / or the second beam splitting can be obliquely incident on the optical waveguide assembly 30 so that the incident angle between the optical waveguide assembly 30 and the waveguide substrate 31 is greater than the critical angle of total reflection, so as to achieve total reflection propagation in the optical waveguide assembly 30.

[0053] Specifically, the included angles formed by the first reflection surface 21 and the second reflection surface 22 of the first prism 20 with the plane where the waveguide substrate 31 is located are the same. Specifically, after the light emitted by the projection optical machine 10 vertically passes through the waveguide substrate 31, it is divided into a first beam of light and a second beam of light by the edge 23. The first beam of light is reflected by the first reflection surface 21 into the optical waveguide assembly 30, and the second beam of light is reflected by the second reflection surface 22 into the optical waveguide assembly 30. Among them, the incident angle of the first beam of light reflected by the first reflection surface 21 entering the waveguide substrate 31 is greater than the critical angle of total reflection of the waveguide substrate 31. Similarly, the incident angle of the second beam of light reflected by the second reflection surface 22 entering the waveguide substrate 31 is greater than the critical angle of total reflection of the waveguide substrate 31. The first beam of light and the second beam of light entering the waveguide substrate 31 undergo total reflection and propagate in opposite directions to the corresponding first output grating 32 and second output grating 33, and finally are output from the first output grating 32 and the second output grating 33 and received by the two eyes of the wearer respectively, so that the wearer can see the virtual image.

[0054] In another case, the first splitting light and / or the second splitting light are incident on the optical waveguide component 30 in a direction perpendicular to the waveguide substrate 31. At this time, the optical waveguide component 30 includes a first coupling grating 36 and a second coupling grating 36, and the first coupling grating 36 and the second coupling grating 36 are disposed on the waveguide substrate 31. Under the action of the first coupling grating 36 and the second coupling grating 36, the first splitting light and the second splitting light can be obliquely incident on the waveguide substrate 31 so that the incident angle between the light and the waveguide substrate 31 is greater than the critical angle of total reflection, so as to achieve total reflection propagation in the optical waveguide component 30.

[0055] It can be seen that the optical waveguide component 30 in the present application can determine whether to provide the coupling grating 36 according to the situation. When the light incident on the waveguide substrate 31 satisfies the condition of total reflection in the waveguide substrate 31, the coupling grating 36 can be omitted; when the incident direction of the light incident on the waveguide substrate 31 does not satisfy the condition of total reflection in the waveguide substrate 31, the coupling grating 36 can be provided.

[0056] Please refer to Figure 1 and Figure 2 , taking the incident angle α of the first splitting light entering the waveguide substrate 31 being greater than the critical angle β of total reflection of the waveguide substrate 31 as an example, the critical angle satisfies the following formula (1):

[0057] β = arcsin(1 / n) (1).

[0058] Wherein, β is the critical angle of total reflection, and n is the refractive index of the waveguide substrate 31 of the optical waveguide component 30.

[0059] In some embodiments, please continue to refer to Figures 8 to 10 , the optical waveguide component 30 further includes a first turning grating 34 and a second turning grating 35. The first turning grating 34 and the second turning grating 35 are disposed on the waveguide substrate 31. The first turning grating 34 corresponds to the first coupling-out grating 32, and the second turning grating 35 corresponds to the second coupling-out grating 33. The first splitting light enters the first coupling-out grating 32 after being turned by the first turning grating 34, and the second splitting light enters the second coupling-out grating 33 after being turned by the second turning grating 35. The first coupling-out grating 32 is configured to couple out the first splitting light, and the second coupling-out grating 33 is configured to couple out the second splitting light. The first coupling-out grating 32 and the second coupling-out grating 33 respectively correspond to the left and right eyes of the wearer one by one. It can be seen that through the action of the first turning grating 34, the second turning grating 35, the first coupling-out grating 32 and the second coupling-out grating 33, the light emitted by the projection optical machine 10 can be respectively emitted to the left and right eyes of the wearer, so that the user can see an enlarged virtual picture.

[0060] The first input grating 36, the second input grating 36, the first turning grating 34, the second turning grating 35, the first output grating 32 or the second output grating 33 can be one of a straight-tooth grating, an inclined grating, and a blazed grating, or can be other types of gratings, such as a volume holographic grating. The first input grating 36, the second input grating 36, the first turning grating 34, the second turning grating 35, the first output grating 32 or the second output grating 33 can be processed on the waveguide substrate 31 by means of nanoimprinting, etching, exposure, or the like.

[0061] Among them, the first turning grating 34, the second turning grating 35, the first output grating 32, and the second output grating 33 are all diffraction gratings. The light rays emitted by the projection optical machine 10 are split and reflected by the first prism 20. The first split light and the second split light are emitted in opposite directions respectively, and then propagate in the form of total reflection inside the waveguide substrate 31. The first split light reaches the first turning grating 34 and undergoes diffraction, then propagates to the first output grating 32 and undergoes diffraction, and is emitted from the first output grating 32; the second split light reaches the second turning grating 35 and undergoes diffraction, then propagates to the second output grating 33 and undergoes diffraction, and is emitted from the second output grating 33. Finally, the first split light and the second split light are received by the left and right eyes of the wearer respectively.

[0062] Please continue to refer to Figures 1 to 5 and Figure 7 , the near-eye display device 100 further includes a projection lens 80. The projection lens 80 is disposed between the projection optical machine 10 and the projection lens 80 to adjust the path of the light rays emitted from the projection optical machine 10, so that when the first prism 20 splits the light rays, the light rays can be split into the first split light and the second split light with approximately the same light intensity as much as possible, so that the light intensities received by the wearer's two eyes are approximately the same.

[0063] In the near-eye display device 100 provided by the embodiments of the present application, the near-eye display device 100 includes a projection optical machine 10, a first prism 20, and an optical waveguide assembly 30. The projection optical machine 10 is configured to generate light. The first prism 20 is located on the light-emitting side of the projection optical machine 10. The first prism 20 has a first reflection surface 21 and a second reflection surface 22. The first reflection surface 21 and the second reflection surface 22 are connected to form an edge 23. The edge 23 is disposed opposite to the projection optical machine 10. The edge 23 is configured to divide the light into a first split light and a second split light. The first reflection surface 21 is configured to reflect the first split light, and the second reflection surface 22 is configured to reflect the second split light. The optical waveguide assembly 30 is disposed on the light-emitting side of the first prism 20. The optical waveguide assembly 30 is configured to receive the first split light and the second split light. The first split light and the second split light enter the left and right eyes of the wearer through the propagation of the optical waveguide assembly 30. It can be seen from this that the first prism 20 can split the light emitted by the projection optical machine 10 into two parts and enter the left and right eyes of the wearer respectively. In this way, the number of projection optical machines 10 is reduced, the cost is reduced, and the volume of the near-eye display device 100 is also correspondingly reduced. The installation position of the projection optical machine 10 is changed from both sides of the wearer's head to between the two eyes of the wearer, which can effectively reduce the interference of the projection optical machine 10 on the field of view and improve the user experience of the wearer.

[0064] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0065] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0066] The near-eye display device provided by the embodiments of the present application has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A near-eye display device, characterized in that: include: A projection light engine, the projection light engine being configured to generate light; A first prism, the first prism is located at the light-emitting side of the projection light machine, the first prism has a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface are connected to form an edge, the edge is arranged opposite to the projection light machine, the edge is configured to split the light into a first split light and a second split light, the first reflecting surface is configured to reflect the first split light, and the second reflecting surface is configured to reflect the second split light; An optical waveguide component is disposed on the light-emitting side of the first prism, and is configured to receive the first split light and the second split light.

2. The near-eye display device according to claim 1, characterized in that: The projection optical machine and the first prism are respectively arranged on different sides of the optical waveguide component.

3. The near-eye display device according to claim 2, characterized in that: It also includes a second prism and a third prism, wherein the second prism is bonded to the first reflecting surface, and the third prism is bonded to the second reflecting surface.

4. The near-eye display device according to claim 3, characterized in that: A side surface of the second prism close to the optical waveguide component is parallel to the plane where the optical waveguide component is located, and a side surface of the third prism close to the optical waveguide component is parallel to the plane where the optical waveguide component is located.

5. The near-eye display device according to claim 2, characterized in that: The optical waveguide assembly further comprises a first colloid and a second colloid, wherein the first colloid is arranged between the optical waveguide assembly and the first reflection surface of the first prism, and the second colloid is arranged between the optical waveguide assembly and the second reflection surface of the first prism.

6. The near-eye display device according to claim 1, characterized in that: The projection optical machine and the first prism are both arranged on the same side of the optical waveguide component.

7. The near-eye display device according to claim 6, characterized in that: It also includes a first reflection structure and a second reflection structure, the first reflection structure corresponds to the first reflection surface, the second reflection structure corresponds to the second reflection surface, the first split light enters the optical waveguide component after being reflected by the first reflection structure, and the second split light enters the optical waveguide component after being reflected by the second reflection structure.

8. The near-eye display device according to claim 7, characterized in that: The first reflective structure and / or the second reflective structure is a reflective flat plate, the first reflective structure is spaced apart from the first reflective surface, and the second reflective structure is spaced apart from the second reflective surface.

9. The near-eye display device according to claim 7, characterized in that: The first reflection structure is a fourth prism, and the fourth prism has a third reflection surface and a fourth reflection surface parallel to each other. The third reflection surface is in contact with the first reflection surface of the first prism, and the first split light is reflected by the third reflection surface and the fourth reflection surface in sequence and then enters the optical waveguide component.

10. The near-eye display device according to any one of claims 1 to 9, characterized in that: It also includes a first reflective film and a second reflective film, wherein the first reflective film is arranged on the first reflective surface, and the second reflective film is arranged on the second reflective surface.

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