CN219978635U - Optical device, near-eye display system and enhanced display system - Google Patents
Optical device, near-eye display system and enhanced display system Download PDFInfo
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- CN219978635U CN219978635U CN202320827718.2U CN202320827718U CN219978635U CN 219978635 U CN219978635 U CN 219978635U CN 202320827718 U CN202320827718 U CN 202320827718U CN 219978635 U CN219978635 U CN 219978635U
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- 238000010168 coupling process Methods 0.000 description 7
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- 238000002310 reflectometry Methods 0.000 description 5
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Abstract
The utility model relates to the technical field of waveguides, and provides an optical device, a near-eye display system and an enhanced display system, wherein the optical device comprises a waveguide substrate; the opposite ends of the waveguide substrate are provided with a first coupling-in structure and a second coupling-in structure; a first image source and a second image source are respectively arranged at the first coupling-in structure and the second coupling-in structure; the first image source and the second image source respectively generate a first light beam and a second light beam; the first light beam and the second light beam are projected to the waveguide substrate and are emitted out of the waveguide substrate, and a first view field range and a second view field range are formed respectively; the first field of view range and the second field of view range overlap on the same side of the waveguide substrate to form a full field of view range of the optical device. According to the embodiment of the utility model, the FOV of the optical device is increased by arranging the coupling-in structure and the image source at the two ends of the waveguide.
Description
Technical Field
The utility model relates to the technical field of waveguides, and particularly provides an optical device, a near-eye display system and an enhanced display system.
Background
The existing array optical waveguide has the problem that the refractive index of the glass material of the waveguide sheet substrate is different from that of air, so that the total reflection angle exists, the existing waveguide is often used for distributing an image source at the coupling-in end at one side of the waveguide and coupling the light rays of the image source into the array optical waveguide, the included angle between the central view field and the limiting view field of the waveguide is smaller, and only the view field angle (FOV) within a narrower view field range can be supported. The angle of view supported by existing one-dimensional array optical waveguides is typically no more than 40 degrees.
In AR applications, in order to concentrate an image in the center of a field of view, in a "supported field of view", only a range in which the limited field of view is symmetrical with respect to the center field of view can be used, and there is a limitation in that the field of view range is too small.
Disclosure of Invention
The utility model provides an optical device, a near-eye display system and an enhanced display system, and aims to solve the problem that the FOV of the existing array optical waveguide is too small.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, embodiments of the present utility model provide an optical device, comprising:
a waveguide substrate;
the opposite ends of the waveguide substrate are provided with a first coupling-in structure and a second coupling-in structure;
the waveguide substrate is internally provided with a first coupling-out structure and a second coupling-out structure;
a first image source and a second image source are respectively arranged at the first coupling-in structure and the second coupling-in structure;
the first image source and the second image source respectively generate a first light beam and a second light beam;
the first light beam is projected to the waveguide substrate and is emitted out of the waveguide substrate through the first coupling-out structure, so that a first field of view range is formed; the second light beam is projected to the waveguide substrate and is emitted out of the waveguide substrate through the second coupling-out structure, so that a second field of view range is formed;
the first field of view range and the second field of view range overlap on the same side of the waveguide substrate to form a full field of view range of the optical device.
The utility model has the beneficial effects that: the utility model increases the field of view (FOV) of the optical device by the coupling structures arranged at the two ends, and compared with the prior art which enlarges the FOV range by using the waveguide substrate with high refractive index, the utility model greatly reduces the economic cost of the optical device.
The working process of the optical device of the utility model is as follows: by arranging the first coupling-in structure and the second coupling-in structure at two opposite ends of the waveguide substrate respectively, after the light beams coupled in by the coupling-in structures are coupled out by the waveguide substrate, the first view field range and the second view field range are formed respectively, the first view field range and the second view field range are overlapped on the same side of the waveguide substrate, and human eyes can collect image information in an angle range of approximately 180 degrees, namely, the waveguide supports approximately 180 degrees of horizontal FOV.
In one embodiment, the first coupling-in structure has a first coupling-in surface, the second coupling-in structure has a second coupling-in surface, and the first light beam and the second light beam are projected to the waveguide substrate through the first coupling-in surface and the second coupling-in surface, respectively;
the first light beam is perpendicular to the first coupling-in surface, and the second light beam is perpendicular to the second coupling-in surface.
In one embodiment, the waveguide substrate comprises a first surface and a second surface, wherein the first surface is a surface of the waveguide substrate on a side close to the full field of view, and the second surface is a surface of the waveguide substrate on a side far away from the full field of view; the first surface is opposite to the second surface and parallel to each other.
In one embodiment, the first coupling-out structure includes a plurality of first array light splitting films arranged at intervals and in parallel, and the second coupling-out structure includes a plurality of second array light splitting films arranged at intervals and in parallel.
In one embodiment, a first polarization state conversion structure is arranged between the adjacent first array light splitting films, and a second polarization state conversion structure is arranged between the adjacent second array light splitting films;
the first polarization state conversion structure is used for enabling the first light beam to have a first linear polarization direction; the second polarization state conversion structure is configured to provide the second light beam with a second linear polarization direction.
In one embodiment, the first and second polarization state converting structures are half wave plates.
In one embodiment, the first image source and the second image source are miniature projectors.
In one embodiment, the waveguide substrate includes two sub-waveguides arranged in parallel, each of the sub-waveguides having an adhesive surface that is perpendicular to the first surface.
In a second aspect, embodiments of the present utility model provide a near-eye display system comprising an optical device as described above.
In a third aspect, embodiments of the present utility model provide an augmented reality display system comprising a near-eye display system as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical device according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of an optical device according to another embodiment of the utility model.
Wherein, each reference sign in the figure:
1. a waveguide substrate; 11. a first coupling-in structure; 12. a second coupling-in structure; 13. a first surface; 14. a second surface; 15. a first out-coupling structure; 16. a second out-coupling structure; 17. a first polarization state converting structure; 18. a second polarization state converting structure; 19. an adhesive surface; 21. a first image source; 22. a second image source; 111. a first coupling-in surface; 121. a second coupling-in surface; m, a first view field range; n, a second field of view range; a1, limiting a view field of a first image source; b1, a first image source central view field; a2, a second image source limit view field; b2, the center view field of the second image source.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In a first aspect, embodiments of the present utility model provide a near-eye display system comprising an optical device.
In a second aspect, embodiments of the present utility model provide an augmented reality display system comprising a near-eye display system as described above.
In one embodiment, the augmented reality display system further comprises a frame, a nose pad and two temples, wherein the first image source 21 and the second image source 22 in the optical device are disposed over the nose pad.
Referring to fig. 1, in a third aspect, an embodiment of the present utility model provides an optical device, including:
a waveguide substrate 1;
opposite ends of the waveguide substrate 1 have a first coupling-in structure 11 and a second coupling-in structure 12;
the waveguide substrate 1 has a first coupling-out structure 15 and a second coupling-out structure 16 therein;
the first and second incoupling structures 11 and 12 are provided with a first and a second image source 21 and 22, respectively;
the first image source 21 and the second image source 22 generate a first light beam and a second light beam, respectively;
the first light beam is projected to the waveguide substrate 1 and is emitted out of the waveguide substrate 1 through the first coupling-out structure 15, so that a first field-of-view range M is formed; the second light beam is projected to the waveguide substrate 1 and is emitted out of the waveguide substrate 1 through the second coupling-out structure 16, so that a second field-of-view range N is formed;
the first field of view range M and the second field of view range N overlap on the same side of the waveguide substrate 1 to form the full field of view range of the optical device.
In one embodiment, as shown in fig. 1, a first image source 21 at one end of the waveguide substrate 1 emits a first light beam, defining an effective viewing angle range supported by the first light beam as α, and defining a viewing angle range supported by α as a limiting viewing field a, where the angle of the light beam projected in the limiting viewing field a can be propagated through total reflection and coupled out. The second image source 22 at the other end of the waveguide substrate 1 emits a second light beam, defining the effective viewing angle range supported by the second light beam as beta, and defining the viewing angle range supported by beta as a limiting viewing field B, wherein the angle of the light beam projected in the limiting viewing field B can be transmitted in a total reflection way and coupled out.
The angle information of the images of the limit view field A and the limit view field B are overlapped with each other, and human eyes can collect the image information in the angle range of approximately 180 degrees, namely the waveguide supports the horizontal FOV of approximately 180 degrees.
According to the embodiment of the utility model, the first coupling structure 11 and the second coupling structure are respectively arranged at the two opposite ends of the waveguide substrate 1, so that after light beams coupled by the coupling structures are coupled out through the waveguide substrate 1, a first view field range M and a second view field range N are respectively formed, and the first view field range M and the second view field range N are overlapped on the same side of the waveguide substrate 1 to form a full view field range of the large optical device.
The beneficial effects of the embodiment are that: by the coupling-in structures arranged at the two ends, the full view angle supporting range (FOV for short) of the optical device is increased, and compared with the prior art, the embodiment greatly reduces the economic cost of the optical device by using the waveguide substrate with high refractive index to expand the FOV range.
Optionally, the first coupling-in structure 11 has a first coupling-in surface 111, the second coupling-in structure 12 has a second coupling-in surface 121, and the first light beam and the second light beam are projected to the waveguide substrate 1 through the first coupling-in surface 111 and the second coupling-in surface 121, respectively;
the first light beam is perpendicular to the first coupling-in surface 111, and the second light beam is perpendicular to the second coupling-in surface 121.
In one embodiment, the waveguide structure shown in fig. 1, the first coupling-out structure 15 forms an angle with the first surface 13 equal to one half of the angle between the first coupling-in surface 111 and the second surface 14; the angle between the second coupling-out structure 16 and the first surface 13 is equal to one half of the angle between the second coupling-in surface 121 and the second surface 14. In this embodiment, the first light beam is perpendicular to the first coupling-in surface 111, the second light beam is perpendicular to the second coupling-in surface 121, that is, the incident light beam of the central field of view at each image source is perpendicular to the corresponding coupling-in surface, and the outgoing light beam is perpendicular to the first surface 13 of the waveguide substrate 1, so that the human eye range in front of the waveguide in this embodiment can receive the image with the angle range of the FOV field of view increased.
Optionally, the waveguide substrate 1 includes a first surface 13 and a second surface 14, where the first surface 13 is a surface of the waveguide substrate 1 on a side close to the full field of view, and the second surface 14 is a surface of the waveguide substrate 1 on a side far from the full field of view; the first surface 13 is opposite to the second surface 14 and parallel to each other.
In this embodiment, by designing the opposite surfaces of the waveguides to be parallel to each other, it is ensured that the light emitted by each image point is projected to the coupling-in structure and the light beam when the light is coupled out by the waveguides is parallel, so that the image source image is prevented from being narrowed or widened after being coupled out by the waveguides.
Optionally, the first coupling-out structure 15 includes a plurality of first array light splitting films disposed at intervals and arranged in parallel, and the second coupling-out structure 16 includes a plurality of second array light splitting films disposed at intervals and arranged in parallel.
In this embodiment, the arrangement directions of the first array light splitting film and the second array light splitting film are opposite. Each array of spectroscopic films can be designed to include, but is not limited to, 2 to 10 film layers, depending on the thickness specification of the conventional waveguide substrate 1.
Referring to fig. 2, optionally, a first polarization state conversion structure 17 is disposed between adjacent first array light splitting films, and a second polarization state conversion structure 18 is disposed between adjacent second array light splitting films;
the first polarization state converting structure 17 is configured to provide the first light beam with a first linear polarization direction; the second polarization state converting structure 18 is configured to impart a second linear polarization direction to the second light beam.
In this embodiment, a polarization state conversion structure is added between adjacent film layers of each array of light-splitting films, so as to change the vibration direction of the first linearly polarized light ray and the vibration direction of the second linearly polarized light ray incident on the film layer after the polarization state conversion structure, at this time, the vibration direction of part of the first linearly polarized light ray is converted into the same vibration direction as the original vibration direction of the second linearly polarized light ray, and the vibration direction of part of the second linearly polarized light ray is converted into the same vibration direction as the original vibration direction of the first linearly polarized light ray, thereby changing the incident quantity of the first linearly polarized light ray of the film layer after the polarization state conversion structure, and thus changing the emergent quantity of the first linearly polarized light ray incident on the film layer after the polarization state conversion structure, and thus changing the transmittance of the whole array of light-splitting films to the incident linearly polarized light ray.
Compared with the prior art, the polarization state conversion structure is additionally arranged between the film layers, so that the emergent quantity of specific linearly polarized light in the array waveguide can be obviously improved, the effect of adjusting the reflectivity specification of a plurality of light-splitting film layers is achieved, and a certain film layer with the same reflectivity can be reused in the whole structure of the array light-splitting film. The position of the polarization state conversion structure in the waveguide substrate can be flexibly designed according to the actual effect and the actual application, for example, the polarization state conversion structure can be placed between any adjacent film layers.
The number of the polarization state conversion structures can be adaptively designed according to the number of the film layers according to different requirements.
In particular, it should be noted that the position of the polarization state conversion structure cannot be located before the first film layer, because the polarization state conversion structure at the position does not change the reflectivity of the array dichroic film for a certain linearly polarized light.
For example, in one embodiment, since the intensities of the outgoing light beams of the film layers are set to be uniform, the outgoing light beam is changed by the polarization state conversion structure, so that the reflectivities of the fourth film layer and the fifth film layer to the S light are α and α/(1- α), respectively. It can be seen that this embodiment has the effect of reducing the reflectivity specification of the arrayed waveguide film.
Optionally, the first polarization state converting structure 17 and the second polarization state converting structure 18 are half wave plates.
In one embodiment, the polarization state converting structure comprises at least one half wave plate. When the polarization state conversion structure is a plurality of half wave plates arranged in an array, the axial angles of the half wave plates are overlapped, light beams enter from the coupling-in area of the waveguide, pass through the film layer in front of the wave plates and the wave plates, change the polarization direction after passing through the wave plates, and finally are emitted from the coupling-out area of the waveguide. In addition, each polarization state conversion structure can be formed by combining two quarter wave plates.
Alternatively, the first image source 21 and the second image source 22 are micro projectors.
In one embodiment, a micro-projector includes a micro-image source device and a collimation device.
In one embodiment, the waveguide substrate 1 may be an integral waveguide substrate, or may be a combination of two independent sub-waveguides.
Alternatively, the waveguide substrate 1 comprises two sub-waveguides arranged in parallel, each sub-waveguide having an adhesive surface 19 bonded to each other, the adhesive surface 19 being perpendicular to the first surface 13.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. An optical device, comprising:
a waveguide substrate;
the opposite ends of the waveguide substrate are provided with a first coupling-in structure and a second coupling-in structure;
the waveguide substrate is internally provided with a first coupling-out structure and a second coupling-out structure;
a first image source and a second image source are respectively arranged at the first coupling-in structure and the second coupling-in structure;
the first image source and the second image source respectively generate a first light beam and a second light beam;
the first light beam is projected to the waveguide substrate and is emitted out of the waveguide substrate through the first coupling-out structure, so that a first field of view range is formed; the second light beam is projected to the waveguide substrate and is emitted out of the waveguide substrate through the second coupling-out structure, so that a second field of view range is formed;
the first field of view range and the second field of view range overlap on the same side of the waveguide substrate to form a full field of view range of the optical device.
2. The optical device of claim 1, wherein:
the first coupling-in structure is provided with a first coupling-in surface, the second coupling-in structure is provided with a second coupling-in surface, and the first light beam and the second light beam are respectively projected to the waveguide substrate through the first coupling-in surface and the second coupling-in surface;
the first light beam is perpendicular to the first coupling-in surface, and the second light beam is perpendicular to the second coupling-in surface.
3. An optical device according to claim 1 or 2, characterized in that:
the waveguide substrate comprises a first surface and a second surface, wherein the first surface is a surface of the waveguide substrate on one side close to the full view field range, and the second surface is a surface of the waveguide substrate on one side far away from the full view field range; the first surface is opposite to the second surface and parallel to each other.
4. An optical device according to claim 1 or 2, characterized in that:
the first coupling-out structure comprises a plurality of first array light splitting films which are arranged at intervals and are arranged in parallel, and the second coupling-out structure comprises a plurality of second array light splitting films which are arranged at intervals and are arranged in parallel.
5. The optical device of claim 4, wherein:
a first polarization state conversion structure is arranged between the adjacent first array light splitting films, and a second polarization state conversion structure is arranged between the adjacent second array light splitting films;
the first polarization state conversion structure is used for enabling the first light beam to have a first linear polarization direction; the second polarization state conversion structure is configured to provide the second light beam with a second linear polarization direction.
6. An optical device as recited in claim 5, wherein:
the first polarization state converting structure and the second polarization state converting structure are half wave plates.
7. An optical device according to claim 1 or 2, characterized in that:
the first image source and the second image source are miniature projectors.
8. An optical device according to claim 3, wherein:
the waveguide substrate comprises two sub-waveguides which are arranged in parallel, each sub-waveguide is provided with a bonding surface which is mutually combined, and the bonding surface is perpendicular to the first surface.
9. A near-eye display system, comprising:
an optical device as claimed in any one of claims 1 to 8.
10. An enhanced display system, comprising:
the near-eye display system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320827718.2U CN219978635U (en) | 2023-04-13 | 2023-04-13 | Optical device, near-eye display system and enhanced display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320827718.2U CN219978635U (en) | 2023-04-13 | 2023-04-13 | Optical device, near-eye display system and enhanced display system |
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| Publication Number | Publication Date |
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| CN219978635U true CN219978635U (en) | 2023-11-07 |
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| CN202320827718.2U Active CN219978635U (en) | 2023-04-13 | 2023-04-13 | Optical device, near-eye display system and enhanced display system |
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