CN211236328U - Waveguide device and display device - Google Patents
Waveguide device and display device Download PDFInfo
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- CN211236328U CN211236328U CN202020213403.5U CN202020213403U CN211236328U CN 211236328 U CN211236328 U CN 211236328U CN 202020213403 U CN202020213403 U CN 202020213403U CN 211236328 U CN211236328 U CN 211236328U
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Abstract
The utility model discloses a waveguide device, which comprises a waveguide body, a first grating part and a second grating part, wherein the first grating part and the second grating part are arranged on the waveguide body; the first grating part comprises grating units which are periodically arranged along the two-dimensional direction, and the grating units are in a shape formed by connecting at least two curved edges to enclose the lower boundary of the overlooking visual angle of the first grating part. The grating unit of the first grating part in the waveguide device adopts the grating unit structure, and compared with the waveguide used in the prior art, the grating unit can reduce the processing difficulty of the grating in the waveguide device, improve the processing efficiency, reduce the processing cost and be easier for batch production of the waveguide device. The utility model discloses still disclose a display device.
Description
Technical Field
The utility model relates to an augmented reality shows technical field, especially relates to a waveguide device. The utility model discloses still relate to a display device.
Background
Augmented Reality (AR) technology is a technology for providing additional information (so-called "Augmented") for a user in the real world by some technical means, organically integrating images of a virtual world and scenes of the real world, and deeply integrating calculated information with the real world, thereby providing richer information and immersive experience for the user. In the information age, augmented reality is the most direct way to acquire information, has extremely wide application scenarios, such as military training, medical assistance, educational learning, game industry, entertainment art and the like, and is widely considered as the next generation computing platform following computers.
The augmented reality technology can be realized by a plurality of hardware platforms, wherein wearable augmented reality equipment, namely AR glasses, have the most immersive feeling, the hardware form of the method is simple glasses, light is guided into human eyes through microstructures on the surfaces of lenses, and the hardware realization method is the most convenient and fast and convenient and is the mainstream technology of AR. The AR lens aims at guiding an image from a microdisplay to the human eye through the lens, the grating-waveguide scheme is a mainstream technical scheme, the basic principle is as shown in fig. 1, the surface of the waveguide 3 is provided with a grating 1 and a grating 2, light output by the micro-projector 4 is coupled into the waveguide 3 by the grating 1, the light propagates in the waveguide 3 by total reflection, when encountering another grating 2, a part of light is coupled out, the coupled light enters the human eye 5, so that the same image as the output of the micro-projector 4 can be seen, meanwhile, the human eye 5 can see a real world scene, and the two parts are overlapped to realize the function of enhancing reality.
However, the waveguide used in the prior art has a long grating processing mode, high cost and depends heavily on equipment, so that the waveguide is difficult to produce in batch.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a waveguide device compares with prior art and can reduce the processing degree of difficulty of grating among the waveguide device, can improve machining efficiency, reduce the processing cost, changes in mass production. The utility model also provides a display device.
In order to achieve the above object, the utility model provides a following technical scheme:
a waveguide device comprises a waveguide body, a first grating part and a second grating part, wherein the first grating part and the second grating part are arranged on the waveguide body;
the first grating part comprises grating units which are periodically arranged along a two-dimensional direction, and the lower boundary of the overlooking visual angle of the first grating part is in a shape formed by connecting at least two curved edges.
Preferably, the grating unit has a shape surrounded by at least two curved edges under the top view angle of the first grating part, and the grating unit boundary satisfies the following equation within a two-dimensional region of [ -cos (30 °) d/2, cos (30 °) d/2] × [ -d/4, d/4] where the grating unit is located:
wherein d is the period of the two-dimensional grating along two directions, and the value range of delta is (0, 2).
Preferably, the lower boundary of the grating unit at the top view angle of the first grating portion is a shape surrounded by three curved sides, or the lower boundary of the grating unit at the top view angle of the first grating portion is a shape surrounded by six curved sides.
Preferably, the second grating portion includes periodically arranged protrusions, and the protrusions are inclined with respect to a normal direction of the surface of the second grating portion.
Preferably, the projection comprises a first side and a second side.
Preferably, the first side top and the second side top are connected, or the protrusion further includes a top surface connecting the first side top and the second side top.
Preferably, the light energy which is coupled out by the first grating portion and can be received by the human eye decreases as the included angle between the coupled-out light and the normal direction of the first grating portion increases, and the light energy which is coupled into the waveguide body by the second grating portion and can be received by the human eye increases as the included angle between the coupled-in light and the normal direction of the second grating portion increases.
Preferably, the optical waveguide further comprises a reflecting device arranged on the side of the waveguide body far away from the user viewing side and used for reflecting the light rays in the waveguide body, which are to be emitted out of the waveguide body far away from the user viewing side, back into the waveguide body.
A display device comprising a projection device for generating image light and a waveguide device as described above.
According to the above technical scheme, the utility model provides a waveguide device includes the waveguide body and sets up first grating portion and second grating portion on the waveguide body, and second grating portion is used for going into this internally with the light coupling waveguide, and first grating portion is used for going out this externally with the light coupling waveguide of this internal propagation of waveguide. The first grating part comprises grating units which are periodically arranged along the two-dimensional direction, and the grating units are in a shape formed by connecting at least two curved edges and enclosing the lower boundary of the overlooking visual angle of the first grating part. The utility model discloses a grating unit of first grating portion adopts this kind of grating unit structure among the waveguide device, compares the processing degree of difficulty that can reduce grating among the waveguide device with the waveguide that uses among the prior art, can improve machining efficiency, reduce the processing cost, changes in waveguide device's mass production.
The utility model also provides a display device can reach above-mentioned beneficial effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a display device in a waveguide scheme;
fig. 2 is a front view of a waveguide device according to an embodiment of the present invention;
FIG. 3 is a top view of the waveguide assembly of FIG. 2;
fig. 4 is a top view of a first grating portion according to an embodiment of the present invention;
fig. 5 is a top view of a first grating portion according to another embodiment of the present invention;
fig. 6 is a top view of a first grating portion according to another embodiment of the present invention;
fig. 7 is a top view of a first grating portion according to another embodiment of the present invention;
fig. 8 is a schematic view of a second grating portion according to an embodiment of the present invention;
fig. 9 is a graph showing the diffraction efficiency of the second grating part varying with the incident angle α according to an embodiment of the present invention;
fig. 10 is a schematic view of a second grating portion according to another embodiment of the present invention;
fig. 11 is a schematic view of a second grating portion according to another embodiment of the present invention;
fig. 12(a) is a schematic diagram of a waveguide device according to an embodiment of the present invention, illustrating a large-angle incident light;
fig. 12(b) is a schematic diagram of a waveguide device according to an embodiment of the present invention with low angle incidence of light;
fig. 13(a) is a schematic diagram of the embodiment of the present invention in which the light energy that can be received by the human eye and is coupled out through the first grating portion varies with the included angle between the coupled-out light and the normal direction of the first grating portion;
fig. 13(b) is a schematic diagram of the embodiment of the present invention in which the light energy coupled into the waveguide body through the second grating portion varies with the included angle between the coupled light and the normal direction of the second grating portion;
fig. 14 is a front view of a waveguide assembly according to yet another embodiment of the present invention;
fig. 15 is a flowchart of a method for manufacturing a grating portion in a waveguide device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
An embodiment of the present invention provides a waveguide device, including a waveguide body, and a first grating portion and a second grating portion disposed on the waveguide body, where the second grating portion is used to couple light into the waveguide body, and the first grating portion is used to expand light propagated in the waveguide body in two directions and couple the light out of the waveguide body;
the first grating part comprises grating units which are periodically arranged along a two-dimensional direction, and the lower boundary of the overlooking visual angle of the first grating part is in a shape formed by connecting at least two curved edges.
The waveguide body is a waveguide structure capable of guiding light to propagate. Light is coupled into the waveguide body through the second grating part, and when the light which is propagated through total reflection in the waveguide body reaches the first grating part, the first grating part expands the light to two directions and couples the light in the waveguide body out of the waveguide body. The boundary of the grating unit under the first grating part top view angle refers to a boundary which is obtained under the first grating part top view angle and limits the range of the grating unit. The curved edge refers to an edge in a curved shape. The boundary of the grating unit is formed by connecting at least two curved edges, and the boundary of the grating unit at least comprises two curved edges.
The grating unit of the first grating portion in the waveguide device of the embodiment has a shape formed by connecting at least two curved edges, and the grating unit of the first grating portion in the waveguide device adopts the grating unit structure, so that compared with a waveguide used in the prior art, the processing difficulty of the grating in the waveguide device can be reduced, the processing efficiency can be improved, the processing cost can be reduced, and the waveguide device can be more easily produced in batch.
The waveguide device will be described in detail with reference to the following embodiments and drawings. Referring to fig. 2 and 3, fig. 2 is a front view of a waveguide device provided in this embodiment, and fig. 3 is a top view of the waveguide device shown in fig. 2, as can be seen from the drawings, the waveguide device includes a waveguide body 10, and a first grating portion 11 and a second grating portion 12 that are disposed on the waveguide body 10, the second grating portion 12 is used for coupling light into the waveguide body 10, and the first grating portion 11 is used for expanding light propagating in the waveguide body 10 to two directions and coupling the light out of the waveguide body 10.
The first grating part 11 includes grating units periodically arranged along a two-dimensional direction, a boundary of the grating units at a top view angle of the first grating part 11 is a shape formed by connecting at least two curved sides, and the boundary is formed by connecting at least two sides and is different sides that are different from each other. The boundary of the grating unit is formed by connecting at least two curved edges, which means that the boundary of the grating unit at least comprises two curved edges, or the boundary of the grating unit is formed by connecting a preset number of curved edges, for example, the boundary is formed by connecting two curved edges, or the boundary is formed by connecting three curved edges or four curved edges; the boundary of the grating unit may include, in addition to at least two curved sides, other shaped sides, that is, the boundary of the grating unit is formed by connecting at least two curved sides and a certain number of other shaped sides.
In an embodiment, please refer to fig. 4, fig. 4 is a top view of the first grating portion of the present embodiment, and it can be seen from the figure that the first grating portion 11 includes grating units 110 periodically arranged along the directions 1 and 2, an included angle between the two directions is 60 °, and for the grating units 110 included in the first grating portion 11, a boundary of the grating unit 110 obtained under a top view angle of the first grating portion 11 is a shape enclosed by four curved edges. The arranged grating units 110 are respectively arranged periodically along the direction 1 and the direction 2, including two periods, the degree of the included angle θ between the direction 1 and the direction 2 can be set according to the design requirement when the method is implemented, the included angle between the direction 1 and the direction 2 in fig. 4 is 60 degrees, and in other embodiments, the included angle can be set to other degrees according to the design requirement.
In the present embodiment, the boundary of the grating unit 110 obtained from the top view angle of the first grating part 11 is a shape formed by connecting four curved edges, and the boundary of the grating unit satisfies the following equation within the two-dimensional area range of [ -cos (30 °) d/2, cos (30 °) d/2] × [ -d/4, d/4] where the grating unit is located:
wherein d is the period of the two-dimensional grating along two directions, and the value range of delta is (0, 2).
In addition, when the boundary shape of the grating unit of the first grating portion 11 in the top view angle of the first grating portion 11 is determined, the arrangement manner of the grating units on the first grating portion 11 may also be changed, for example, referring to fig. 5, fig. 5 is a top view of the first grating portion of another embodiment, where the boundary shape of the grating unit 111 of the first grating portion 11 in the top view angle of the first grating portion 11 is the same as the boundary shape of the grating unit 110 in the top view angle of the first grating portion 11 shown in fig. 4, but the arrangement manner of the grating units in the two embodiments is different. In specific implementation, after the boundary shape of the grating unit under the overlooking view angle of the first grating part 11 is determined by design, the arrangement mode of the grating unit on the first grating part can be correspondingly set according to the application requirement.
Optionally, in other embodiments, the grating unit that is periodically arranged along the two-dimensional direction that first grating portion 11 includes, the boundary of grating unit under the visual angle that first grating portion 11 overlooks may be formed by connecting two curved sides or three curved sides, or the boundary of grating unit under the visual angle that first grating portion 11 overlooks may also be formed by connecting other number of curved sides, can set up according to the application requirement is corresponding in practical application, all is in the protection scope of the present invention. The specific shape of each curved edge is not specifically limited in this embodiment, and the shape of the grating unit that is formed by connecting and enclosing the boundaries of the first grating portion 11 in the top view angle is not specifically limited in this embodiment. When the boundary shape of the first grating part 11 in the top view angle is determined, the arrangement of the grating units on the first grating part 11 may also be changed. Referring to fig. 6, fig. 6 is a top view of a first grating portion according to yet another embodiment, and it can be seen that the first grating portion 11 includes grating units 112 arranged periodically along directions 1 and 2, and for the grating units 112 included in the first grating portion 11, a boundary of the grating units 112 acquired in a top view of the first grating portion 11 is a shape formed by connecting three curved sides. In another embodiment, the shape of the boundary of the grating unit in the top view angle of the first grating part 11 may be the same as the shape of the boundary of the grating unit 112 in the top view angle of the first grating part 11 shown in fig. 6, but the arrangement of the grating units on the first grating part 11 may be different. Referring to fig. 7, fig. 7 is a top view of a first grating portion according to yet another embodiment, in this embodiment, a grating unit 113 included in the first grating portion 11 has a shape in which boundaries of grating units acquired from a top view of the first grating portion 11 are connected by six curved sides.
Alternatively, in other embodiments, for the grating unit included in the first grating portion 11, the boundary of the grating unit in the top view of the first grating portion 11 may include at least two curved sides, and also include sides of other shapes, that is, the boundary of the grating unit is formed by connecting at least two curved sides and a certain number of sides of other shapes.
In the waveguide device of the further embodiment, the second grating portion 12 includes protrusions arranged periodically, and the protrusions are inclined with respect to the normal direction of the surface of the second grating portion 12. Referring to FIG. 8, FIG. 8 shows an embodiment of the present inventionAs can be seen from the schematic diagram of the second grating portion, the protrusions of the second grating portion 12 are periodically arranged along a one-dimensional direction, the protrusions are inclined with respect to a normal direction of the surface of the second grating portion 12, the second grating portion 12 specifically includes a first side surface 120, a second side surface 121, and a top surface 122, and the top of the first side surface 120 is connected with the top of the second side surface 121 by the top surface 122. The top surface 122 is a plane in this embodiment, and other shapes of the top surface are possible in other embodiments, all of which are within the scope of the present invention. The second grating portion 12 of such a structure needs to determine at least the following four parameters, i.e., the tilt angle θ of the first side 1201The inclination angle theta of the second side surface 1212Height h of the bump, width delta of the bottom of the bump and period d1Wherein the inclination angle theta of the first side 1201The included angle between the first side surface 120 and the second grating part surface, and the inclination angle theta of the second side surface 1212The included angle between the second side surface 121 and the surface of the second grating portion is referred to as a protrusion height h, the maximum distance from the top of the protrusion to the bottom of the protrusion is referred to as a protrusion height h, and the width Δ of the bottom of the protrusion is referred to as a protrusion height Δ. The optional individual parameter ranges may be: theta1＝10°～50°，△θ＝θ2-θ1＝±10°，△＝0.1d1～0.8d1Referring to fig. 9, fig. 9 is a graph of diffraction efficiency of the second grating portion varying with the incident angle α according to the present embodiment, in which the second grating portion has a first side 120 with an inclination angle of 35 °, a second side 121 with an inclination angle of 35 °, and a protrusion bottom width of 0.5d1By optimizing each parameter of the second grating portion, the diffraction efficiency can be high and the corresponding incident angle range is large.
Referring to fig. 10, fig. 10 is a schematic diagram of a second grating portion according to yet another embodiment, and it can be seen that in this embodiment, protrusions of the second grating portion 12 are periodically arranged along a one-dimensional direction, the protrusions are inclined with respect to a normal direction of a surface of the second grating portion 12, the second grating portion 12 specifically includes a first side surface 123 and a second side surface 124, a top of the first side surface 123 is connected with a top of the second side surface 124, and both the first side surface 123 and the second side surface 124 are planes. Referring to fig. 11, fig. 11 is a schematic diagram of a second grating portion according to yet another embodiment, and it can be seen that in this embodiment, the second grating portion 12 includes protrusions periodically arranged along a one-dimensional direction, the protrusions specifically include a first side surface 125 and a second side surface 126, a top of the first side surface 125 is connected to a top of the second side surface 126, and both the first side surface 125 and the second side surface 126 are curved surfaces.
The waveguide device of the embodiment adopts the one-dimensional grating and the two-dimensional grating, on one hand, the number of the gratings can be reduced to the maximum extent, and thus, the imaging effect can be completed only by using two gratings, and compared with a scheme of three gratings, the waveguide device is more compact, and the difficulty of mass production is greatly reduced. On the other hand, in the waveguide device, the second grating part adopts an asymmetric grating structure, so that the diffraction efficiency of the second grating part is also asymmetric, and the asymmetry can be just compensated with the attenuation of the first grating part. Preferably, in the waveguide device of this embodiment, the light energy that can be received by the human eye and is coupled out through the first grating portion decreases as the included angle between the coupled-out light and the normal direction of the first grating portion increases, and the light energy that can be received by the human eye and is coupled into the waveguide body through the second grating portion increases as the included angle between the coupled-in light and the normal direction of the second grating portion increases, please refer to fig. 12(a) and 12(b), where the thickness of the arrow in the figure represents the relative magnitude of the energy. Fig. 12(a) is a schematic diagram of the waveguide device according to the present embodiment, where light is incident at a large angle, the light propagates in the waveguide at a large angle, so the number of propagation times is small, and the light 100 capable of entering human eyes only encounters the first grating portion 2 times, so the attenuation is small. Fig. 12(b) is a schematic diagram of the waveguide device according to the present embodiment when light is incident at a small angle, and the light propagates through the waveguide at a small angle, so that the propagation number is large, and the light 200 that can enter the human eye encounters the first grating portion 4 times, so that the attenuation is large. When the light propagates in the first grating portion, a part of the light is coupled out for each diffraction, which causes energy attenuation, for example, 1% of the energy is coupled out for each first grating portion, and the remaining energy is 0.99 after 10 times of propagation10This results in a tendency for the image plane viewed by the user to fade, which is 0.34. Referring to fig. 13(a) and 13(b), fig. 13(a) shows the energy of the light coupled out by the first grating portion and capable of being received by the human eye according to the present embodimentFig. 13(b) is a schematic diagram of the variation of the included angle between the coupled-out light and the normal direction of the first grating portion, in this embodiment, the light energy coupled into the waveguide body through the second grating portion varies with the variation of the included angle between the coupled-in light and the normal direction of the second grating portion. In the waveguide device of the present embodiment, since the diffraction efficiency of the second grating portion has high asymmetry, the energy of the second grating portion and the attenuation caused by the first grating portion can compensate each other by design, and the display uniformity of the waveguide device can be greatly improved by this way.
Further preferably, the waveguide device of this embodiment further includes a reflection device disposed on the side of the waveguide body away from the user viewing side, and configured to reflect the light inside the waveguide body to exit to the outside of the waveguide body away from the user viewing side back into the waveguide body. Referring to fig. 14, fig. 14 is a front view of a waveguide device according to another embodiment, a reflection device 13 is disposed on a side of the waveguide body 10 away from the user, when light propagating in the waveguide body 10 reaches the first grating portion 11, a part of the light is coupled out of the waveguide body 10 at the user viewing side, and another part of the light is emitted out of the waveguide body 10 away from the user viewing side. Alternatively, the reflecting means 13 may be a transflective film, which may be plated on the side of the waveguide body facing away from the user's view. Or the reflection device 13 may be a half-mirror, and is attached to the side of the waveguide body away from the user, or the reflection device 13 may also be a wire grid polarization film, or may also be other optical elements, all within the protection scope of the present invention.
Illustratively, in one embodiment, the waveguide body 10 of the waveguide device is in the form of a slab, and is made of highly parallel optical glass having a refractive index n of 1.1-3 and a thickness of 0.1-3 mm. The second grating part 12 is a one-dimensional periodic structure with a grating period d1The first grating part 11 has a two-dimensional periodicity of 200nm to 1000nmStructure, two periods are the same and are d2Two periods form a 60 degree angle between them, two-dimensional grating period d2And one-dimensional grating period d1A relationship of d2＝d1And/cos 30 degrees, and the periodic direction of the one-dimensional grating just falls on the angular bisector of the two periodic directions of the two-dimensional grating. The grating groove depth of the first grating portion 11 ranges from 50nm to 500 nm.
The embodiment of the present invention further provides a method for manufacturing a grating portion in a waveguide device, where the manufactured grating portion is applied to the first grating portion of the waveguide device, please refer to fig. 15, and the manufacturing method includes the following steps:
s20: preparing a substrate, and forming a photosensitive layer on the substrate.
The photosensitive layer is a substance sensitive to light, and can be etched away when light is irradiated to the photosensitive layer and the intensity of the irradiated light reaches a certain range. An optional photosensitive layer may use photoresist.
S21: and using two coherent light beams to intersect and enter the photosensitive layer of the substrate, and exposing the photosensitive layer.
Two coherent light beams are used for intersecting and entering a photosensitive layer of a substrate, the two light beams are converged and interfere to form a group of interference fringes with periodically changing light intensity, and the converged interference light is irradiated to the photosensitive layer to expose the photosensitive layer and the substrate, so that a periodic structure is generated on the photosensitive layer. When the grating unit on the first grating part is manufactured, the period d of the grating unit which is periodically arranged is determined by the intersection angle theta of the two beams, and the relationship between the period d and the period d is as follows: d is 2 λ/sin (θ/2), where λ is the laser wavelength used for exposure. Therefore, the intersection angle of the two light beams can be determined according to the designed period of the grating unit on the first grating part. When the grating unit on the second grating part is manufactured, the substrate needs to be exposed twice, and after the first exposure is finished, the substrate is rotated by a certain angle alpha for the second exposure. The rotation angle alpha determines the included angle between the two-dimensional directions of the grating units of the second grating part. Preferably, two beams of laser light with extremely high coherence can be used for the two beams.
S22: and etching the substrate, and etching the substrate to form a grating unit based on the periodic structure formed by the photosensitive layer.
In the step, the substrate is etched, and the periodic structure is etched on the substrate based on the periodic structure formed on the photosensitive layer, so that the grating unit is manufactured and formed on the substrate.
S23: and removing the residual photosensitive layer on the substrate to obtain the grating part.
For example, for the grating unit in which the grating unit boundary of the first grating portion in the above-mentioned embodiment satisfies the following equation, interference fabrication may be performed using two coherent lights vibrating in a sine wave, where the two lights intersect at an included angle of 60 degrees:
The first grating part is manufactured by the holographic exposure method, the manufacturing efficiency is high, compared with a method for manufacturing the grating in the prior art, the method for manufacturing the grating is capable of reducing the processing difficulty, and is beneficial to batch production and improvement of the production efficiency.
Correspondingly, the embodiment of the utility model provides a display device is still provided, including the image projection device and above the waveguide device, the image projection device is used for producing image light. The image light is light carrying image information.
The display device of the embodiment, the first grating portion of the waveguide device comprises grating units which are periodically arranged along a two-dimensional direction, the grating units are in a shape formed by connecting and enclosing at least two curved edges under the overlooking visual angle of the first grating portion, and the grating units of the first grating portion in the waveguide device adopt the grating unit structure.
The display device of the present embodiment may be an augmented reality display device, and may also be applied to a mixed reality display device.
It is right above that the present invention provides a waveguide device and a display device. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (9)
1. A waveguide device is characterized by comprising a waveguide body, a first grating part and a second grating part, wherein the first grating part and the second grating part are arranged on the waveguide body, the second grating part is used for coupling light rays into the waveguide body, and the first grating part is used for expanding the light rays propagating in the waveguide body along two directions and coupling the light rays out of the waveguide body;
the first grating part comprises grating units which are periodically arranged along a two-dimensional direction, and the lower boundary of the overlooking visual angle of the first grating part is in a shape formed by connecting at least two curved edges.
2. The waveguide device of claim 1, wherein the grating unit has a boundary in a shape surrounded by at least two curved edges under a top view of the first grating portion, and the boundary of the grating unit satisfies the following equation within a two-dimensional region of [ -cos (30 °) d/2, cos (30 °) d/2] × [ -d/4, d/4] where the grating unit is located:
wherein d is the period of the two-dimensional grating along two directions, and the value range of delta is (0, 2).
3. The waveguide device according to claim 1, wherein the grating unit has a shape surrounded by three curved sides at a bottom view of the first grating portion, or has a shape surrounded by six curved sides at a bottom view of the first grating portion.
4. A waveguide device according to any one of claims 1-3, wherein the second grating portion comprises a periodic arrangement of protrusions, which protrusions are inclined with respect to the normal of the surface of the second grating portion.
5. The waveguide device of claim 4, wherein the protrusion comprises a first side and a second side.
6. The waveguide device of claim 5, wherein the first side top and the second side top are connected or the protrusion further comprises a top surface connecting the first side top and the second side top.
7. The waveguide device according to claim 4, wherein the light energy coupled out by the first grating portion and received by the human eye decreases with the increase of the angle between the coupled-out light and the normal direction of the first grating portion, and the light energy coupled into the waveguide body by the second grating portion and received by the human eye increases with the increase of the angle between the coupled-in light and the normal direction of the second grating portion.
8. A waveguide device according to claim 1, further comprising reflecting means disposed on the side of the waveguide body remote from the user's view for reflecting light rays within the waveguide body that are to exit the waveguide body remote from the user's view back into the waveguide body.
9. A display device comprising a projection device for generating image light and a waveguide device according to any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024060796A1 (en) * | 2022-09-19 | 2024-03-28 | 歌尔光学科技有限公司 | Optical waveguide device and head-mounted display apparatus |
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| WO2024060796A1 (en) * | 2022-09-19 | 2024-03-28 | 歌尔光学科技有限公司 | Optical waveguide device and head-mounted display apparatus |
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