Near-eye display device

Abstract

A near-eye display device (100), comprising: a projection optical engine (10) configured to generate light; a first prism (20) located on a light emergent side of the projection optical engine (10), wherein the first prism (20) has a first reflecting surface (21) and a second reflecting surface (22), the first reflecting surface (21) and the second reflecting surface (22) are connected to form an edge (23), and the edge (23) is arranged opposite the projection optical engine (10); and an optical waveguide assembly (30) arranged on a light emergent side of the first prism (20), wherein the optical waveguide assembly (30) is configured to receive first split light and second split light.

Description

Near-eye display device

[0001] The present application claims priority to the Chinese patent application No. 202421955623.X, filed on August 13, 2024, and entitled "Near-eye display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of extended reality display, in particular to a near-eye display device. BACKGROUND

[0003] AR technology, also known as augmented reality technology, relies on near-eye display devices for implementation, and AR glasses have become the most breakthrough star product in this field. Near-eye display technology implemented using 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. TECHNICAL PROBLEM

[0004] In the currently common near-eye display device, each eye of the wearer corresponds to a waveguide lens respectively configured with a corresponding projection light machine, so as to respectively project a corresponding projection picture to the two waveguide lenses, and present a good display experience to the wearer. As can be seen, the number of projection light machines is at least two, and the cost is relatively high. Moreover, due to the relatively large size of the projection light machine, the projection light machine cannot be too far away from the waveguide lens, which to some extent leads to an increase in the assembly layout difficulty of the projection light machine. Taking AR glasses as an example, the two projection light machines are usually placed at the two temple positions, which will block the left and right fields of view of the wearer, seriously affecting the wearing experience. TECHNICAL SOLUTION

[0005] The present application provides a near-eye display device, which comprises:

[0006] a projection light machine configured to generate light rays;

[0007] a first prism located on the light exit side of the projection light machine, the first prism having a first reflecting surface and a second reflecting surface, the first reflecting surface and the second reflecting surface being connected to form an edge, the edge being opposite to the projection light machine, the edge being configured to divide the light rays into first light and second light, the first reflecting surface being configured to reflect the first light, and the second reflecting surface being configured to reflect the second light;

[0008] an optical waveguide assembly disposed on the light exit side of the first prism, the optical waveguide assembly being configured to receive the first light and the second light, and the first light and the second light propagating in opposite directions in the optical waveguide assembly. Advantages

[0009] In the near-eye display device provided by the embodiment of the present application, the near-eye display device comprises a projection light machine, a first prism and a light waveguide assembly. The projection light machine is configured to generate light. The first prism is located on the light exit 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 divide the light into first light and second light. The first reflecting surface is configured to reflect the first light. The second reflecting surface is configured to reflect the second light. The light waveguide assembly is arranged on the light exit side of the first prism. The light waveguide assembly is configured to receive the first light and the second light. The first light and the second light propagate through the light waveguide assembly and enter the left eye and the right eye of the wearer. As can be seen, the first prism can divide the light emitted by the projection light machine into two parts, which enter the left eye and the right eye of the wearer respectively. In this way, the number of the projection light machines is reduced, the cost is reduced, and the volume of the near-eye display device is also reduced accordingly. The projection light machine is arranged between the two eyes of the wearer instead of being arranged on the two sides of the head of the wearer. This can effectively reduce the interference of the projection light machine on the field of view and improve the use experience of the wearer. BRIEF DESCRIPTION OF DRAWINGS

[0010] FIG. 1 is a first structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0011] FIG. 2 is a second structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0012] FIG. 3 is a third structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0013] FIG. 4 is a fourth structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0014] FIG. 5 is a fifth structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0015] FIG. 6 is a second structural schematic diagram of a first prism, a fourth prism and a fifth prism provided by an embodiment of the present application.

[0016] FIG. 7 is a sixth structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0017] FIG. 8 is a seventh structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0018] FIG. 9 is an eighth structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0019] FIG. 10 is a ninth structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0020] Embodiments of the present application

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.

[0022] The present application provides a near-eye display device, which can reduce the interference of a projection light machine on a wearer, and the following will be specifically described with reference to the drawings.

[0023] Please refer to FIG. 1 and FIG. 2, FIG. 1 is a first structure schematic diagram of a near-eye display device provided by the embodiments of the present application, and FIG. 2 is a second structure schematic diagram of a near-eye display device provided by the embodiments of the present application.

[0024] The present application provides a near-eye display device 100, which can superimpose a real scene and virtual information into the same picture or space in real time, for example, AR glasses.

[0025] The near-eye display device 100 at least includes a projection light machine 10, a first prism 20 and a light waveguide assembly 30. The projection light machine 10 is configured to generate light rays. The first prism 20 is arranged on the light exit side of the projection light machine 10. The light waveguide assembly 30 is arranged on the light exit side of the first prism 20.

[0026] The projection light machine 10 can be one of a Micro LED light machine, a DLP light machine, an LCOS light machine and an LBS light machine. The number of the projection light machine 10 can be one, which is located in the middle of the near-eye display device 100, i.e. between the wearer's two eyes.

[0027] The light waveguide assembly 30 is used for imaging. On the one hand, it forms a virtual picture far away from the pixels on the projection light machine 10 and transmits it to the user's eyes. On the other hand, it transmits the light rays of the real scene to the user's eyes, that is, it integrates the virtual picture and the real scene.

[0028] The first prism 20 is configured to divide the light rays into first and second split light, and reflect the first and second split light into the light waveguide assembly 30. The first and second split light propagate in opposite directions in the light waveguide assembly 30 and enter the eyes. For example, the first split light enters the user's left eye, and the second split light enters the user's right eye.

[0029] The first prism 20 has a first reflecting surface 21 and a second reflecting surface 22, the first reflecting surface 21 and the second reflecting surface 22 are connected to form an edge 23, the edge 23 is arranged opposite to the light waveguide assembly 30, the edge 23 is configured to divide the light into a first light and a second light, the first reflecting surface 21 is configured to reflect the first light into the light waveguide assembly 30, and the second reflecting surface 22 is configured to reflect the second light into the light waveguide assembly 30.

[0030] It can be understood that the first prism 20 is a symmetrical structure, the first reflecting surface 21 and the second reflecting surface 22 are symmetrical relative to the edge 23, and the effects of the first reflecting surface 21 and the second reflecting surface 22 on the first light and the second light are the same, the directions of the effects are opposite and symmetrical.

[0031] The first light and the second light enter the light waveguide assembly 30 and are transmitted in the light waveguide assembly 30 in two opposite directions until entering the left eye and the right eye of the wearer. For example, the first light is transmitted in the light waveguide assembly 30 in a first direction, and the second light is transmitted in the light waveguide assembly 30 in a second direction, the first direction and the second direction are opposite.

[0032] It can be seen that the first prism 20 can divide the light emitted by the projection light machine 10 into two parts, which enter the left eye and the right eye of the wearer respectively. In this way, the number of projection light machines 10 is reduced (only one projection light machine 10 is needed), the cost is reduced, and the volume of the near-eye display device 100 is also reduced accordingly. The setting position of the projection light machine 10 is changed from the two sides of the head of the wearer to between the two eyes of the wearer, which can effectively reduce the interference of the projection light machine 10 on the field of view and improve the user experience of the wearer. In the first embodiment, please continue to refer to FIG. 1, the projection light machine 10 and the first prism 20 are respectively arranged on the opposite sides of the optical waveguide assembly 30. For example, the optical waveguide assembly 30 has a first surface 311 and a second surface 312 opposite to each other, the projection light machine 10 is located on one side of the first surface 311 of the optical waveguide assembly 30, and the first prism 20 is located on one side of the second surface 312 of the optical waveguide assembly 30. The projection light 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 emitted by the projection light machine 10 enters the optical waveguide assembly 30 from the first surface 311, and then is emitted from the second surface 312 of the optical waveguide assembly 30 to the first prism 20, and is divided into first light and second light by the first prism 20. Please refer to FIG. 3, which is a third structure schematic diagram of a near-eye display device provided by the present application. In order to further support the first prism 20 and improve the stability of the relative position of the first prism 20 and the optical waveguide assembly 30, the near-eye display device 100 further comprises a second prism 41 and a third prism 42, the second prism 41 is arranged corresponding to the first reflecting surface 21 of the first prism 20, and the third prism 42 is arranged corresponding to the second reflecting surface 22 of the first prism 20, so as to further support the first prism 20, meet the condition that the first side and the second side of the first prism 20 are at the same angle with the waveguide substrate 31, and realize the symmetry of the optical path. In addition, the second prism 41 and the third prism 42 can also protect the first reflecting surface 21 and the second reflecting surface 22 of the first prism 20. For example, the second prism 41 is arranged in close contact with the first reflecting surface 21 of the first prism 20, and the third prism 42 is arranged in close contact with the second reflecting surface 22 of the first prism 20.

[0033] The first prism 20 and the fourth prism 611 and the fifth prism 612 can be fixed by optical glue or bonding process. Among them, the side of the second prism 41 close to the optical waveguide assembly 30 is parallel to the plane where the optical waveguide assembly 30 is located, and the side of the third prism 42 close to the optical waveguide assembly 30 is parallel to the plane where the optical waveguide assembly 30 is located. For example, the second prism 41 and the third prism 42 are parallel to the second surface 312 of the optical waveguide assembly 30, so as to ensure the stability of light transmission when the first light and the second light propagate in different media.

[0034] It can be understood that if the angle between the first reflecting surface 21 and the plane where the optical waveguide assembly 30 is located is determined, and the side of the second prism 41 close to the optical waveguide assembly 30 is parallel to the plane where the optical waveguide assembly 30 is located, the first light reflected by the first reflecting surface 21 enters the optical waveguide assembly 30 in turn through the second prism 41 and the air, and the transmission direction of the light entering the optical waveguide assembly 30 is the same as or parallel to the direction of the first light reflected by the first reflecting surface 21, so it is only necessary to design the angle between the first reflecting surface 21 and the plane where the waveguide substrate 31 is located to determine whether total reflection can occur in the optical waveguide assembly 30, which undoubtedly simplifies the design of the optical path and avoids 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, which will not be described here.

[0035] Please refer to FIG. 4, which is a fourth structural schematic diagram of the near-eye display device provided by the embodiments of the present application. The optical waveguide assembly 30 and the first prism 20 can be fixed by optical glue or bonding process. When the optical waveguide assembly 30 and the first prism 20 are fixed by optical glue, the near-eye display device 100 further comprises a first glue 51 and a second glue 52, the first glue 51 is arranged between the optical waveguide assembly 30 and the first reflecting surface 21 of the first prism 20, and the second glue 52 is arranged between the optical waveguide assembly 30 and the second reflecting surface 22 of the first prism 20. The first glue 51 and the second glue 52 are used to fix the first prism 20 on the optical waveguide assembly 30, and the refractive index of the first glue 51 and / or the second glue 52 is approximately equal to the refractive index of the optical waveguide assembly 30.

[0036] In other embodiments, please continue to refer to FIG. 2, the projection light machine 10 and the first prism 20 are arranged on the same side of the optical waveguide assembly 30. For example, the optical waveguide assembly 30 has opposite first and second surfaces 311 and 312, and the projection light machine 10 and the first prism 20 are located on one side of the first surface 311 of the optical waveguide assembly 30, or the projection light machine 10 and the first prism 20 are located on one side of the second surface 312 of the optical waveguide assembly 30. The light emitted by the projection light machine 10 enters the optical waveguide assembly 30 after being split and reflected by the first prism 20.

[0037] In order to further adjust the optical path to achieve the best display effect, please continue to refer to FIG. 2 and FIG. 5, which is a fifth structural schematic diagram of the near-eye display device provided by the embodiments of the present application. The near-eye display device 100 further comprises a first reflecting structure 61 and a second reflecting structure 62, the first reflecting structure 61 corresponds to the first reflecting surface 21, the second reflecting structure 62 corresponds to the second reflecting surface 22, the first light enters the optical waveguide assembly 30 after being reflected by the first reflecting structure 61, and the second light enters the optical waveguide assembly 30 after being reflected by the second reflecting structure 62.

[0038] It can be understood that in some cases, the light reflected by the first reflection structure 61 can be obliquely incident on the light waveguide assembly 30 to have an incident angle with the waveguide substrate 31 of the light waveguide assembly 30 greater than the critical angle of total reflection, so as to enable total reflection propagation in the light waveguide assembly 30. In other cases, the light reflected by the first reflection structure 61 can be perpendicularly incident on the light waveguide assembly 30 including the waveguide substrate 31 and the in-coupling grating 36 arranged on the waveguide substrate 31. When the light reflected by the first reflection structure 61 is perpendicularly incident on the in-coupling grating 36, the light can be obliquely incident on the waveguide substrate 31 under the action of the in-coupling grating 36, so as to have an incident angle with the waveguide substrate 31 greater than the critical angle of total reflection, thereby enabling total reflection propagation in the light waveguide assembly 30. Similarly, since the second reflection structure 62 is symmetrically arranged with the first reflection structure 61, the second reflection structure 62 has the same effect as the first reflection structure 61, which will not be described herein again.

[0039] Therefore, the first reflection structure 61 and the second reflection structure 62 can change the optical path to transmit as many light rays as possible into the in-coupling grating 36 or the waveguide substrate 31, thereby maximizing the utilization rate of the light rays.

[0040] In one case, please continue to refer to FIG. 5, the first reflection structure 61 and / or the second reflection structure 62 is a reflective flat plate. The first reflection structure 61 is arranged in a spaced manner with the first reflection surface 21, and the second reflection structure 62 is arranged in a spaced manner with the second reflection surface 22. The first reflection structure 61 and / or the second reflection structure 62 is a reflective flat plate, which can effectively change the area of the light reflected by the first reflection structure 61 and / or the second reflection structure 62 to the light waveguide assembly 30, and can be adaptively changed according to the light waveguide assembly 30.

[0041] In another case, please refer to FIG. 2 and FIG. 6, FIG. 6 is a second structure schematic view of the first prism, the fourth prism and the fifth prism provided by the embodiment of the present application. The first reflection structure 61 is a fourth prism 611, and the fourth prism 611 has a third reflection surface 6111 and a fourth reflection surface 6112 parallel to each other. The third reflection surface 6111 is arranged in a corresponding manner with the first reflection surface 21 of the first prism 20, and the first split light enters the light waveguide assembly 30 after being reflected by the third reflection surface 6111 and the fourth reflection surface 6112 in turn. For example, the third reflection surface 6111 is arranged in a bonded manner with the first reflection surface 21 of the first prism 20.

[0042] On this basis, the second reflecting structure 62 is a fifth prism 612 having a fifth reflecting surface 6121 and a sixth reflecting surface 6122 parallel to each other, the fifth reflecting surface 6121 is arranged correspondingly to the second reflecting surface 22 of the first prism 20, and the second light beam enters the optical waveguide assembly 30 by being reflected by the fifth reflecting surface 6121 and the sixth reflecting surface 6122 in turn. For example, the fifth reflecting surface 6121 is arranged in abutment with the second reflecting surface 22 of the first prism 20.

[0043] It can be understood that, since the fourth prism 611 and the fifth prism 612 are arranged in abutment with the first prism 20 respectively, the first reflecting surface 21 and the second reflecting surface 22 of the first prism 20 can be protected from abrasion, so as to avoid affecting the reflecting effect.

[0044] In the above embodiment, referring to FIG. 7, which is a sixth structural schematic diagram of the near-eye display device provided by the embodiment, in order to increase the reflecting efficiency of the light on the first reflecting surface 21 and the second reflecting surface 22 and avoid the light being absorbed or refracted by the first prism 20, the near-eye display device 100 in the embodiment further includes a first reflecting film 71 and a second reflecting film 72, the first reflecting film 71 is arranged on the first reflecting surface 21, and the second reflecting film 72 is arranged on the second reflecting surface 22. In the first embodiment, referring to FIG. 3, the first reflecting film 71 can be arranged between the first prism 20 and the second prism 41, and the second reflecting film 72 can be arranged between the first prism 20 and the third prism 42, that is, the first reflecting film 71 can be arranged in abutment with or coated on the first prism 20, or can be coated on the second prism 41, the second reflecting film 72 can be arranged in abutment with or coated on the second prism 41, or can be coated on the third prism 42.

[0045] In the second embodiment, referring to FIG. 2, the first reflecting film 71 can be arranged between the first prism 20 and the fourth prism 611, and the second reflecting film 72 can be arranged between the first prism 20 and the fifth prism 612, that is, the first reflecting film 71 can be arranged in abutment with or coated on the first prism 20, or can be coated on the fourth prism 611, the second reflecting film 72 can be arranged in abutment with or coated on the second prism 41, or can be coated on the fifth prism 612.

[0046] In the above embodiments, referring to FIGS. 8-10, FIG. 8 is a seventh structural schematic diagram of a near-eye display device provided in an embodiment of the present application, FIG. 9 is an eighth structural schematic diagram of a near-eye display device provided in an embodiment of the present application, and FIG. 10 is a ninth structural schematic diagram of a near-eye display device provided in an embodiment of the present application. The optical waveguide assembly 30 at least includes a waveguide substrate 31, a first out-coupling grating 32, and a second out-coupling grating 33, and the first out-coupling grating 32 and the second out-coupling grating 33 are arranged on the waveguide substrate 31. The projection light engine 10 and the first prism 20 are arranged on two sides of the waveguide substrate 31, respectively. The waveguide substrate 31 has the advantages of thinness, high light transmittance, large eye movement range, large eye distance, and large field of view 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 substrate 31 can be two, corresponding to the eyes of the wearer.

[0047] In one case, the first split light and / or the second split light can be obliquely incident into the optical waveguide assembly 30, so that the incident angle between the first split light and / or the second split light and the waveguide substrate 31 of the optical waveguide assembly 30 is greater than the critical angle of total reflection, so as to realize total reflection propagation in the optical waveguide assembly 30.

[0048] Specifically, the first reflecting surface 21 and the second reflecting surface 22 of the first prism 20 form the same angle with the plane in which the waveguide substrate 31 is located. Specifically, the light emitted by the projection light engine 10 passes through the waveguide substrate 31 perpendicularly and is split into the first split light and the second split light by the edge 23, the first split light is reflected by the first reflecting surface 21 into the optical waveguide assembly 30, and the second split light is reflected by the second reflecting surface 22 into the optical waveguide assembly 30. The incident angle of the first split light reflected by the first reflecting surface 21 into the waveguide substrate 31 is greater than the critical angle of total reflection of the waveguide substrate 31, and similarly, the incident angle of the second split light reflected by the second reflecting surface 22 into the waveguide substrate 31 is greater than the critical angle of total reflection of the waveguide substrate 31. The first split light and the second split light enter the waveguide substrate 31 and are totally reflected and propagated in opposite directions to the corresponding first out-coupling grating 32 and the second out-coupling grating 33, and finally are coupled out from the first out-coupling grating 32 and the second out-coupling grating 33, respectively, and are received by the eyes of the wearer, so that the wearer can see a virtual picture.

[0049] In another case, the first light and / or the second light is incident on the optical waveguide assembly 30 in a direction perpendicular to the waveguide substrate 31. At this time, the optical waveguide assembly 30 includes a first in-coupling grating 36 and a second in-coupling grating 36 disposed on the waveguide substrate 31. Under the action of the first in-coupling grating 36 and the second in-coupling grating 36, the first light and the second 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 enable total reflection propagation in the optical waveguide assembly 30.

[0050] Therefore, the optical waveguide assembly 30 in the present application can determine whether to dispose the in-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 in-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 in-coupling grating 36 can be disposed.

[0051] Please refer to FIG. 1 and FIG. 2, taking the incident angle a of the first light entering the waveguide substrate 31 being greater than the critical angle b of total reflection of the waveguide substrate 31 as an example. The critical angle satisfies the following formula (1):

[0052] Wherein, b is the critical angle of total reflection, and n is the refractive index of the waveguide substrate 31 of the optical waveguide assembly 30.

[0053] In some embodiments, please continue to refer to FIG. 8 to FIG. 10, the optical waveguide assembly 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 out-coupling grating 32, and the second turning grating 35 corresponds to the second out-coupling grating 33. The first light enters the first out-coupling grating 32 after being turned by the first turning grating 34, and the second light enters the second out-coupling grating 33 after being turned by the second turning grating 35. The first out-coupling grating 32 is configured to out-couple the first light, and the second out-coupling grating 33 is configured to out-couple the second light. The first out-coupling grating 32 and the second out-coupling grating 33 respectively correspond to the left and right eyes of the wearer. Therefore, under the action of the first turning grating 34, the second turning grating 35, the first out-coupling grating 32 and the second out-coupling grating 33, the light emitted by the projection light machine 10 can be respectively emitted to the left and right eyes of the wearer, so that the user can see the enlarged virtual picture.

[0054] The first in-coupling grating 36, the second in-coupling grating 36, the first turning grating 34, the second turning grating 35, the first out-coupling grating 32 or the second out-coupling grating 33 can be one of a straight grating, an inclined grating and a blazed grating, or can be another type of grating, such as a volume holographic grating. The first in-coupling grating 36, the second in-coupling grating 36, the first turning grating 34, the second turning grating 35, the first out-coupling grating 32 or the second out-coupling grating 33 can be processed on the waveguide substrate 31 by nanoimprinting or etching or exposure, etc.

[0055] The first turning grating 34, the second turning grating 35, the first out-coupling grating 32 and the second out-coupling grating 33 are all diffraction gratings. The light emitted by the projector 10 is split and reflected by the first prism 20, and the first split light and the second split light are emitted in opposite directions, then propagate inside the waveguide substrate 31 in the form of total reflection, the first split light reaches the first turning grating 34 to be diffracted, then propagates to the first out-coupling grating 32 to be diffracted, and is emitted from the first out-coupling grating 32; the second split light reaches the second turning grating 35 to be diffracted, then propagates to the second out-coupling grating 33 to be diffracted, and is emitted from the second out-coupling grating 33, finally the first split light and the second split light are received by the left and right eyes of the wearer respectively.

[0056] Please continue to refer to FIGS. 1-5 and 7, the near-eye display device 100 further comprises a projection lens 80, which is arranged on the light-emitting side of the projector 10 to adjust the path of the light emitted from the projector 10, so that when the first prism 20 splits the light, the light is split into first split light and second split light with the same intensity as much as possible, so that the intensity of the light received by the wearer's eyes is approximately the same.

[0057] The near-eye display device 100 provided by the embodiment of the present application includes a projection light machine 10, a first prism 20 and a light waveguide assembly 30. The projection light machine 10 is configured to generate light rays. The first prism 20 is located at the light exit side of the projection light machine 10. The first prism 20 has a first reflecting surface 21 and a second reflecting surface 22. The first reflecting surface 21 and the second reflecting surface 22 are connected to form an edge 23. The edge 23 is arranged opposite to the projection light machine 10. The edge 23 is configured to divide the light rays into first divided light and second divided light. The first reflecting surface 21 is configured to reflect the first divided light. The second reflecting surface 22 is configured to reflect the second divided light. The light waveguide assembly 30 is arranged at the light exit side of the first prism 20. The light waveguide assembly 30 is configured to receive the first divided light and the second divided light. The first divided light and the second divided light propagate through the light waveguide assembly 30 and enter the left and right eyes of the wearer. As can be seen, the first prism 20 can divide the light rays emitted by the projection light machine 10 into two parts, which enter the left and right eyes of the wearer, respectively. In this way, the number of the projection light machines 10 is reduced, the cost is reduced, and the volume of the near-eye display device 100 is also reduced accordingly. The projection light machine 10 is arranged between the eyes of the wearer instead of being arranged at the two sides of the head of the wearer. The projection light machine 10 can effectively reduce the interference with the field of view and improve the use experience of the wearer.

[0058] In the above embodiments, the description of each embodiment focuses on different aspects. The parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0059] In the description of the present application, the terms "first" and "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features.

[0060] The near-eye display device provided by the embodiment of the present application is described in detail. The principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the present application. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as limiting the present application.

Claims

1. A near-eye display device, comprising: a projection light engine configured to generate light rays; a first prism located on an exit side of the projection light engine, the first prism having a first reflective surface and a second reflective surface connected to form an edge opposite to the projection light engine, the edge configured to divide the light rays into first light rays and second light rays, the first reflective surface configured to reflect the first light rays, and the second reflective surface configured to reflect the second light rays; 2. The near-eye display apparatus of claim 1, wherein, a waveguide assembly disposed on an exit side of the first prism, the waveguide assembly configured to receive the first light rays and the second light rays.

3. The near-eye display apparatus of claim 2, wherein, The projection light engine and the first prism are disposed on opposite sides of the waveguide assembly.

4. The near-eye display apparatus of claim 3, wherein, Further comprising a second prism and a third prism, the second prism disposed corresponding to the first reflective surface, and the third prism disposed corresponding to the second reflective surface.

5. The near-eye display apparatus of claim 2, wherein, A side of the second prism close to the waveguide assembly is parallel to a plane on which the waveguide assembly is located, and a side of the third prism close to the waveguide assembly is parallel to the plane on which the waveguide assembly is located.

6. The near-eye display apparatus of claim 1, wherein, Further comprising a first adhesive and a second adhesive, the first adhesive disposed between the waveguide assembly and the first reflective surface of the first prism, and the second adhesive disposed between the waveguide assembly and the second reflective surface of the first prism.

7. The near-eye display apparatus of claim 6, wherein, The projection light engine and the first prism are disposed on the same side of the waveguide assembly.

8. The near-eye display apparatus of claim 7, wherein, Further comprising a first reflective structure corresponding to the first reflective surface, and a second reflective structure corresponding to the second reflective surface, the first light rays entering the waveguide assembly after being reflected by the first reflective structure, and the second light rays entering the waveguide assembly after being reflected by the second reflective structure.

9. The near-eye display apparatus of claim 7, wherein, The first reflective structure is a reflective flat plate, and the first reflective structure is spaced apart from the first reflective surface.

10. The near-eye display apparatus of claim 7, wherein, The second reflective structure is a reflective flat plate, and the second reflective structure is spaced apart from the second reflective surface.

11. The near-eye display apparatus of claim 7, wherein, The first reflective structure is a fourth prism having a third reflective surface and a fourth reflective surface parallel to each other, the third reflective surface abutting the first reflective surface of the first prism, and the first light rays entering the waveguide assembly after being reflected by the third reflective surface and the fourth reflective surface in sequence.

12. The near-eye display apparatus of claim 1, wherein, The second reflective structure is a fifth prism having a fifth reflective surface and a sixth reflective surface parallel to each other, the fifth reflective surface disposed corresponding to the second reflective surface of the first prism, and the second light rays entering the waveguide assembly after being reflected by the fifth reflective surface and the sixth reflective surface in sequence.

13. The near-eye display device of claim 1, wherein, The first reflective surface and the second reflective surface are symmetrical with respect to the edge. Further comprising a first reflective film disposed on the first reflective surface, and a second reflective film disposed on the second reflective surface.

14. The near-eye display apparatus of claim 13, wherein, The second prism is arranged corresponding to the first reflecting surface, and the third prism is arranged corresponding to the second reflecting surface.

15. The near-eye display apparatus of claim 13, wherein, The fourth prism is arranged corresponding to the first reflecting surface, and the fifth prism is arranged corresponding to the second reflecting surface.

16. The near-eye display device of claim 1, wherein, The light waveguide assembly comprises a waveguide substrate, a first out-coupling grating and a second out-coupling grating, the first out-coupling grating and the second out-coupling grating are arranged on the waveguide substrate.

17. The near-eye display apparatus of claim 16, wherein, The first reflecting surface and the second reflecting surface form the same angle with the plane in which the waveguide substrate is located.

18. The near-eye display apparatus of claim 16, wherein, The light waveguide assembly comprises a first in-coupling grating and a second in-coupling grating, the first in-coupling grating and the second in-coupling grating are arranged on the waveguide substrate.

19. The near-eye display apparatus of claim 16, wherein, The light waveguide assembly further comprises a first turning grating and a second turning grating, the first turning grating and the second turning grating are arranged on the waveguide substrate, the first turning grating corresponds to the first out-coupling grating, and the second turning grating corresponds to the second out-coupling grating.

20. The near-eye display device of claim 1, wherein, The light waveguide assembly further comprises a projection lens, the projection lens is arranged on the light-emitting side of the projection light machine.

Images