Eye tracking apparatus and near-eye display device
By setting a holographic medium layer on the lens to record the interference information of the eye-tracking beam, the problem of the smart glasses' LED beads obstructing the view is solved, achieving high-precision eye tracking and increasing the visible area of the lens.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZHUHAI MOJIE TECH CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-07-09
AI Technical Summary
Existing smart glasses require LEDs to be installed on the lenses for eye tracking, which can obstruct the user's view and makes it difficult to achieve high-precision eye tracking.
The interference information of the illumination source beam is recorded by using a holographic medium layer. The illumination source beam is formed on the holographic medium layer by reproducing the beam, thus realizing eye tracking and avoiding the need to put LED beads on the lens.
The increased visible area of the lens reduces obstruction to the user's line of sight, enhancing the flexibility and accuracy of eye tracking.
Smart Images
Figure CN2025102533_09072026_PF_FP_ABST
Abstract
Description
Eye-tracking devices and near-eye display devices
[0001] This application claims priority to Chinese Patent Application No. 2024119968573, filed with the Chinese Patent Office on December 31, 2024, entitled "Eye Tracking Device and Near-Eye Display Device", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of eye tracking, and more particularly to an eye tracking device and a near-eye display device. Background Technology
[0003] Current smart glasses typically use the Pulciens spot, formed by a beam of light shining on the eyeball, as a reference point to calculate the position of the user's gaze. Therefore, LEDs need to be placed at positions opposite the user's eyes to emit light and form the Pulciens spot. However, placing LEDs at positions opposite the user's eyes, such as on the lenses of the smart glasses, inevitably obstructs the user's view. Furthermore, achieving high-precision eye tracking often requires a sufficient number of LEDs. Therefore, minimizing the obstruction of the user's eyes by the eye-tracking hardware in smart glasses to improve the user experience has become a pressing issue. Summary of the Invention
[0004] The main objective of this application is to provide an eye-tracking device and a near-eye display device, which aim to increase the visible area of the lens.
[0005] In a first aspect, this application provides an eye-tracking device, the eye-tracking device comprising:
[0006] A lens assembly, comprising a lens body layer and a holographic medium layer, wherein the holographic medium layer is disposed on the lens body layer and the holographic medium layer records interference information of an illumination light source beam for eye tracking;
[0007] A light source assembly, wherein the light source assembly is used to provide a reproduced light beam for the holographic medium layer;
[0008] The illumination source beam and the reproduced beam are coherent, and the holographic medium layer is used to reproduce the illumination source beam for eye tracking when illuminated by the reproduced beam of the light source component.
[0009] In some embodiments, the lens body layer includes an optical waveguide layer, on which a coupling region is provided. The coupling region is used to couple the reproduced light beam into the optical waveguide layer for transmission, so that the reproduced light beam irradiates the holographic medium layer.
[0010] In some embodiments, the eye-tracking device further includes:
[0011] A camera component is used to capture a target image formed by the light source beam in the human eye, so as to perform eye tracking based on the target image using a preset eye tracking algorithm.
[0012] In some embodiments, the illumination source beam includes a first divergence angle beam and a second divergence angle beam, and the camera component is used to capture a target image containing a Pulcyn spot formed by the first divergence angle beam in the human eye, so as to perform eye tracking based on the Pulcyn spot in the target image according to a preset eye tracking algorithm.
[0013] Alternatively, the camera component is used to capture a target image containing interference fringes formed by the second divergence angle beam in the human eye, so as to perform eye tracking based on the interference fringes in the target image according to a preset eye tracking algorithm;
[0014] The first divergence angle of the first divergence angle beam is smaller than the second divergence angle of the second divergence angle beam.
[0015] In some embodiments, when the reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce a first exit angle beam and a second exit angle beam for eye tracking.
[0016] In some embodiments, the light source assembly is used to provide a first reconstructed beam and / or a second reconstructed beam to the holographic medium layer;
[0017] When the first reproduced beam from the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the first exit angle beam used for eye tracking; and / or
[0018] When the second reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the second exit angle beam used for eye tracking.
[0019] In some embodiments, the light source assembly includes a reproducing light source and a dichroic mirror, wherein the dichroic mirror is used to change the angle of the reproducing beam of the reproducing light source to obtain a first reproducing beam and a second reproducing beam.
[0020] In some embodiments, the illumination source beam and the reproduced beam are infrared beams.
[0021] Secondly, this application also provides a near-eye display device, which includes the eye-tracking device described in any one of the embodiments of this application.
[0022] In some embodiments, the near-eye display device further includes a visible light source for providing a virtual image for the near-eye display device.
[0023] This application provides an eye-tracking device and a near-eye display device. The eye-tracking device includes: a lens assembly comprising a lens body layer and a holographic medium layer, wherein the holographic medium layer is disposed on the lens body layer and records interference information of an illumination light source beam used for eye tracking; and a light source assembly for providing a reproduced light beam to the holographic medium layer. The illumination light source beam and the reproduced light beam are coherent, and the holographic medium layer is used to reproduce the illumination light source beam used for eye tracking when illuminated by the reproduced light beam from the light source assembly. Eye tracking is performed using the beam reproduced by the holographic medium layer, replacing eye tracking using a beam emitted by LEDs. This avoids the need for LEDs on the lens, thus preventing LEDs from obstructing the user's view and increasing the visible area of the lens. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 is a schematic block diagram of an eye-tracking device according to an embodiment of this application;
[0026] Figure 2 is a schematic block diagram of an eye-tracking device according to another embodiment of this application;
[0027] Figure 3 is a schematic block diagram of an eye-tracking device according to another embodiment of this application;
[0028] Figure 4 is a schematic diagram of a first divergence angle beam provided in an embodiment of this application;
[0029] Figure 5 is a schematic diagram of a target image under illumination by a first divergence angle beam according to an embodiment of this application;
[0030] Figure 6 is a schematic diagram of a second divergence angle beam provided in an embodiment of this application;
[0031] Figure 7 is a schematic diagram of a target image under illumination by a second divergence angle beam according to an embodiment of this application;
[0032] Figure 8 is a schematic diagram of a first emission angle beam provided in an embodiment of this application;
[0033] Figure 9 is a schematic diagram of a second emission angle beam provided in an embodiment of this application.
[0034] Figure 10 is a schematic block diagram illustrating a lens manufacturing method according to another embodiment of this application. Detailed Implementation
[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0036] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.
[0037] This application provides an eye-tracking device and a near-eye display device.
[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0039] Please refer to Figure 1, which is a schematic block diagram of an eye-tracking device provided in an embodiment of this application.
[0040] As shown in Figure 1, the eye-tracking device provided in this embodiment includes:
[0041] A lens assembly, comprising a lens body layer and a holographic medium layer, wherein the holographic medium layer is disposed on the lens body layer and the holographic medium layer records interference information of an illumination light source beam for eye tracking;
[0042] A light source assembly, wherein the light source assembly is used to provide a reproduced light beam for the holographic medium layer;
[0043] The illumination source beam and the reproduced beam are coherent, and the holographic medium layer is used to reproduce the illumination source beam for eye tracking when illuminated by the reproduced beam of the light source component.
[0044] For example, a holographic medium is a material capable of recording and storing the amplitude and phase information of a light beam. When two coherent light beams simultaneously illuminate the holographic medium, the two beams interfere with each other in the holographic medium. The amplitude and phase information of the beams are stored in the holographic medium in the form of an interference pattern. When one of the beams illuminates the interference pattern on the holographic medium again, the holographic medium can reproduce the other beam.
[0045] This application utilizes the characteristics of holographic media to set a holographic media layer on the lens body layer and record the information of the illumination light source beam used for eye tracking in the holographic media layer. When eye tracking is required, the illumination light source beam can be reproduced by illuminating the holographic media layer on the lens body layer with the reproduced beam, so that the illumination light source beam forms a Purkinje image or interference fringes in the human eye. The direction of human eye gaze can be determined according to the position of the Purkinje image or the shape of the interference fringes, thereby realizing eye tracking.
[0046] Compared with related technologies that use LED beads on the lens body layer to emit light beams, the holographic medium layer has extremely high transparency, does not obstruct the user's view, and increases the visible area of the lens.
[0047] Please refer to Figure 2, which is a schematic block diagram of an eye-tracking device provided in another embodiment of this application.
[0048] As shown in Figure 2, in some embodiments, the lens body layer includes an optical waveguide layer, and a coupling region is provided on the optical waveguide layer. The coupling region is used to couple the reproduced light beam into the optical waveguide layer for transmission, so that the reproduced light beam irradiates the holographic medium layer.
[0049] For example, the lens body layer is used to form an optical waveguide, which is a structure used to transmit and guide light beams, confining the light beam to a specific area for transmission, and transmitting the virtual image to be displayed to the human eye. In this embodiment, an optical waveguide is used to transmit the reproduced light beam, allowing the reproduced light beam to interfere with the light beam of an illumination source positioned at any location.
[0050] For example, a coupling region is provided on the optical waveguide layer to couple the reproduced light beam into the optical waveguide layer for transmission. The coupling region can be generated directly on the optical waveguide layer or it can be separately positioned from the optical waveguide layer. The structure of the coupling region can be a mirror, prism, surface relief grating, or volume holographic grating, etc., and is not limited here. Furthermore, the coupling region can also be used to couple visible light signals into the optical waveguide for transmission until they reach the output region and are emitted to the human eye to generate a virtual image; this part is not shown. Therefore, multiple coupling regions can be superimposed and respond to visible light signals and infrared light signals respectively to achieve the functions of eye-tracking illumination and virtual image display.
[0051] Please refer to Figure 3, which is a schematic block diagram of an eye-tracking device according to another embodiment of this application.
[0052] As shown in Figure 3, in some embodiments, the eye-tracking device further includes:
[0053] A camera component is used to capture a target image formed by the light source beam in the human eye, so as to perform eye tracking based on the target image using a preset eye tracking algorithm.
[0054] For example, in order to perform eye tracking, a target image of the human eye needs to be captured by a camera component so that the direction of the human eye's gaze can be determined based on the position of the Pulcyn spot or the shape of the interference fringes in the target image according to a preset human eye tracking algorithm, thereby realizing eye tracking.
[0055] For example, the holographic medium layer is disposed on the side of the lens body layer that is close to or far from the human eye, and the first area of the holographic medium layer is less than or equal to the second area of the lens body layer.
[0056] For example, the holographic medium layer is attached to the lens body layer, either embedded in the lens body layer or closely attached to and protruding from the lens body layer; the holographic medium layer may also have a certain distance from the lens body layer, which is not limited here.
[0057] In some embodiments, the illumination source beam includes a first divergence angle beam and a second divergence angle beam, and the camera component is used to capture a target image containing a Pulcyn spot formed by the first divergence angle beam in the human eye, so as to perform eye tracking based on the Pulcyn spot in the target image according to a preset eye tracking algorithm.
[0058] Alternatively, the camera component is used to capture a target image containing interference fringes formed by the second divergence angle beam in the human eye, so as to perform eye tracking based on the interference fringes in the target image according to a preset eye tracking algorithm;
[0059] The first divergence angle of the first divergence angle beam is smaller than the second divergence angle of the second divergence angle beam.
[0060] Please refer to Figures 4 and 5. Figure 4 is a schematic diagram of a first divergence angle beam provided in an embodiment of this application; Figure 5 is a schematic diagram of a target image illuminated by a first divergence angle beam provided in an embodiment of this application.
[0061] As shown in Figures 4 and 5, Figure 4 uses a first divergence angle beam with a smaller divergence angle as the illumination source beam, thereby forming a relatively concentrated light spot on the surface of the cornea, namely the Pulcyn spot shown in Figure 5. Based on the preset eye-tracking algorithm, the direction of human eye gaze can be determined according to the position of the Pulcyn spot.
[0062] Please refer to Figures 6 and 7. Figure 6 is a schematic diagram of a second divergence angle beam provided in an embodiment of this application; Figure 7 is a schematic diagram of a target image illuminated by a second divergence angle beam provided in an embodiment of this application.
[0063] As shown in Figures 6 and 7, Figure 6 uses a second divergence angle beam with a relatively large divergence angle as the illumination source beam, thereby forming relatively concentrated interference fringes on the surface of the cornea. The second divergence angle beam can be, for example, a structured light beam. As shown in Figure 7, due to the shape characteristics of the human eye, different shapes of interference fringes will be formed when the human eye gazes in different directions. Based on the preset eye-tracking algorithm, the direction of human eye gaze can be determined according to the shape of the interference fringes.
[0064] In some embodiments, the illumination source beam and the reproduced beam are infrared beams.
[0065] Specifically, the wavelength range of the illumination source beam and the reproduced beam is 800nm to 950nm.
[0066] For example, to avoid interfering with the virtual image to be displayed on the near-eye display device, both the illumination source beam and the reproduction beam are infrared beams invisible to the human eye. Accordingly, the target image on which eye tracking is based can be acquired by an infrared camera.
[0067] In some embodiments, when the reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce a first exit angle beam and a second exit angle beam for eye tracking.
[0068] For example, in order to cover the human eye's line of sight in all directions, related technologies typically require setting up multiple LED beads to emit multiple light beams from different directions for eye tracking. To simulate the eye-tracking effect of multiple LED beads, this application embodiment improves the flexibility of eye tracking by recording multiple light beams from different directions on a holographic medium layer. It is understood that the first emission angle beam and the second emission angle beam have different emission angles.
[0069] It is understood that in the eye-tracking device provided in this application embodiment, the illumination light source beam emitted by the holographic medium layer includes, but is not limited to, a first emission angle beam and a second emission angle beam, and may also include a third emission angle beam, a fourth emission angle beam, etc. The number of illumination light source beams with different emission angles can be set according to actual needs and is not limited here.
[0070] In some embodiments, the light source assembly is used to provide a first reconstructed beam and / or a second reconstructed beam to the holographic medium layer;
[0071] When the first reproduced beam from the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the first exit angle beam used for eye tracking; and / or
[0072] When the second reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the second exit angle beam used for eye tracking.
[0073] For example, in related technologies, the processor can control the LED beads used for eye tracking separately, and control the number of LED beads lit and the direction of the illumination light beam according to actual needs. In order to make the illumination light beam emitted by the holographic medium layer also adjustable according to actual needs, different illumination light beams can be recorded by different reproduction beams. When it is necessary to emit an illumination light beam in a certain direction, the light source module is controlled to emit the corresponding reproduction beam, thereby improving the flexibility of eye tracking device provided in this application embodiment for eye tracking.
[0074] Specifically, when eye tracking is required using a beam at the first exit angle, a first reconstructed beam is used to illuminate the holographic medium layer; when eye tracking is required using a beam at the second exit angle, a second reconstructed beam is used to illuminate the holographic medium layer; and when eye tracking is required using a beam at the first exit angle and a beam at the second exit angle, both the first reconstructed beam and the second reconstructed beam are used to illuminate the holographic medium layer.
[0075] For example, the holographic medium layer may include a first holographic medium layer and a second holographic medium layer, with the first emission angle beam recorded in the first holographic medium layer and the second emission angle beam recorded in the second holographic medium layer. Of course, it is not limited to this, and the first emission angle beam and the second emission angle beam may also be recorded in the same holographic medium. This is not limited here.
[0076] In some embodiments, the light source assembly includes a reproducing light source and a dichroic mirror, wherein the dichroic mirror is used to change the angle of the reproducing beam of the reproducing light source to obtain a first reproducing beam and a second reproducing beam.
[0077] Please refer to Figures 8 and 9. Figure 8 is a schematic diagram of a first emission angle beam provided in an embodiment of this application, and Figure 9 is a schematic diagram of a second emission angle beam provided in an embodiment of this application.
[0078] As shown in Figures 8 and 9, the light source module can change the angle of the reproduced light beam emitted by the reproduced light source onto the holographic medium layer by adjusting the angle of the dichroic mirror, thereby obtaining a first reproduced light beam and a second reproduced light beam with different angles. This enables the first emission angle light beam and the second emission angle light beam to be reproduced by the first reproduced light beam and the second reproduced light beam respectively, thereby improving the diversity of the illumination light source beam and realizing eye tracking in different directions.
[0079] Please refer to Figure 10, which is a schematic block diagram illustrating a lens manufacturing method according to another embodiment of this application.
[0080] As shown in Figure 10, this application also provides a method for manufacturing lenses for a near-eye display device. The near-eye display device includes a light source assembly and a lens assembly manufactured using the lens manufacturing method. The lens manufacturing method includes:
[0081] A holographic medium layer is set on the lens body layer;
[0082] The holographic medium layer is illuminated by a preset illumination source beam and a reproduction beam, so that the illumination source beam and the reproduction beam interfere in the holographic medium layer, thereby obtaining the interference information of the illumination source beam and the reproduction beam;
[0083] The holographic medium layer is post-processed to fix the interference information onto the holographic medium layer, so that when the reproduced beam of the light source component illuminates the holographic medium layer, the holographic medium layer can reproduce the illumination light source beam used for eye tracking.
[0084] The illumination source beam and the reproduced beam are coherent.
[0085] For example, during the lens fabrication process, a reconstruction beam emitted by an infrared light source and an illumination beam emitted by an illumination source simultaneously irradiate the holographic medium layer, exposing it to obtain corresponding interference fringes. The holographic medium layer is then post-processed, such as through generalized exposure or baking, to fix the interference information within it. This allows the holographic medium layer to emit an illumination beam for eye tracking when subsequently irradiated by the reconstruction beam emitted by the infrared light source. The illumination source is an infrared light source, and at least two illumination sources are located on the side of the holographic medium layer furthest from the eye.
[0086] For example, the step of illuminating the holographic medium layer with a preset illumination source beam and a reproduction beam, so that the illumination source beam and the reproduction beam interfere in the holographic medium layer to obtain interference information of the illumination source beam and the reproduction beam, includes:
[0087] The holographic medium layer is illuminated by a preset first exit angle beam, a second exit angle beam, and a reconstructed beam, so that the first exit angle beam, the second exit angle beam, and the reconstructed beam interfere in the holographic medium layer, thereby obtaining interference information for recording the first exit angle beam, the second exit angle beam, and the reconstructed beam.
[0088] For example, the illumination source beam recorded by the holographic medium layer may include multiple illumination source beams at different angles, such as a first emission angle beam, a second emission angle beam, and of course, it is not limited to these, and may also include a third emission angle beam, etc. The number of emission angle beams can be set according to actual needs.
[0089] For example, light beams from different angles can interfere with each other through different reproduced light beams. For instance, a first reproduced light beam can interfere with a light beam at a first exit angle, and a second reproduced light beam can interfere with a light beam at a second exit angle. In this way, multiple light beams from different angles can be reproduced through different reproduced light beams, thereby improving the flexibility of the light beams. Alternatively, the same reproduced light beam can interfere with multiple light beams from different angles, which is not limited here.
[0090] In some embodiments, this application also provides a near-eye display device, wherein the near-eye display device includes the eye-tracking device described in any one of the embodiments of this application.
[0091] For example, the near-eye display device includes display devices with eye-tracking functions such as smart glasses and smart helmets.
[0092] In some embodiments, the near-eye display device further includes a visible light source for providing a virtual image for the near-eye display device.
[0093] For example, a near-eye display device displays a virtual image to the human eye through a visible light source, wherein the visible light source and the reproduction light source of the eye-tracking device are spaced apart. The visible light source can be set at the position shown in Figures 8 and 9, but is not limited thereto and is not limited here.
[0094] It is understood that the description of the near-eye display device in this application is only a partial structure of the near-eye display device. A specific near-eye display device may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements.
[0095] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0096] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.
[0097] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An eye-tracking device, wherein, The eye-tracking device includes: A lens assembly, comprising a lens body layer and a holographic medium layer, wherein the holographic medium layer is disposed on the lens body layer and the holographic medium layer records interference information of an illumination light source beam for eye tracking; A light source assembly, wherein the light source assembly is used to provide a reproduced light beam for the holographic medium layer; The illumination source beam and the reproduced beam are coherent, and the holographic medium layer is used to reproduce the illumination source beam for eye tracking when illuminated by the reproduced beam of the light source component.
2. The eye-tracking device according to claim 1, wherein, The lens body layer includes an optical waveguide layer, and a coupling region is provided on the optical waveguide layer. The coupling region is used to couple the reproduced light beam into the optical waveguide layer for transmission, so that the reproduced light beam irradiates the holographic medium layer.
3. The eye-tracking device according to claim 1, wherein, The eye-tracking device also includes: A camera component is used to capture a target image formed by the light source beam in the human eye, so as to perform eye tracking based on the target image using a preset eye tracking algorithm.
4. The eye-tracking device according to claim 3, wherein, The illumination source beam includes a first divergence angle beam and a second divergence angle beam. The camera component is used to capture a target image containing a Pulcyn spot formed by the first divergence angle beam in the human eye, so as to perform eye tracking based on the Pulcyn spot in the target image according to a preset eye tracking algorithm. Alternatively, the camera component is used to capture a target image containing interference fringes formed by the second divergence angle beam in the human eye, so as to perform eye tracking based on the interference fringes in the target image according to a preset eye tracking algorithm; The first divergence angle of the first divergence angle beam is smaller than the second divergence angle of the second divergence angle beam.
5. The eye-tracking device according to any one of claims 1-4, wherein, When the reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the first and second exit angle beams used for eye tracking.
6. The eye-tracking device according to claim 5, wherein, The light source assembly is used to provide a first reconstructed beam and / or a second reconstructed beam to the holographic medium layer; When the first reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the first exit angle beam for eye tracking. and / or When the second reproduced beam of the light source assembly illuminates the holographic medium layer, the holographic medium layer is able to reproduce the second exit angle beam used for eye tracking.
7. The eye-tracking device according to claim 6, wherein, The light source assembly includes a reproducing light source and a dichroic mirror. The dichroic mirror is used to change the angle of the reproducing beam of the reproducing light source to obtain a first reproducing beam and a second reproducing beam.
8. The eye-tracking device according to claim 6, wherein, The holographic medium layer may include a first holographic medium layer and a second holographic medium layer, wherein the first emission angle beam is recorded in the first holographic medium layer and the second emission angle beam is recorded in the second holographic medium layer.
9. The eye-tracking device according to any one of claims 1-4, wherein, The illumination source beam and the reproduced beam are infrared beams.
10. The eye-tracking device according to any one of claims 1-4, wherein, The holographic medium layer is disposed on the side of the lens body layer that is close to or far from the human eye, and the first area of the holographic medium layer is less than or equal to the second area of the lens body layer.
11. The eye-tracking device according to any one of claims 1-4, wherein, The holographic medium layer is attached to the lens body layer.
12. The eye-tracking device according to claim 11, wherein, The holographic medium layer is embedded in the lens body layer, or the holographic medium layer is close to and protrudes from the lens body layer.
13. The eye-tracking device according to any one of claims 1-4, wherein, There is a gap between the holographic medium layer and the lens body layer.
14. A method for manufacturing a lens for a near-eye display device, wherein, The near-eye display device includes a light source assembly and a lens assembly fabricated using the lens fabrication method, the lens fabrication method comprising: A holographic medium layer is set on the lens body layer; The holographic medium layer is illuminated by a preset illumination source beam and a reproduction beam, so that the illumination source beam and the reproduction beam interfere in the holographic medium layer, thereby obtaining the interference information of the illumination source beam and the reproduction beam, wherein the illumination source beam and the reproduction beam are coherent; The holographic medium layer is post-processed to fix the interference information onto the holographic medium layer, thereby obtaining the lens assembly. The holographic medium layer with the fixed interference information can reproduce the illumination light source beam used for eye tracking when illuminated by the reproduced light beam of the light source assembly.
15. The lens fabrication method according to claim 14, wherein irradiating the holographic medium layer with a preset illumination source beam and a reproduction beam comprises: The holographic medium layer is simultaneously illuminated by the reproduction beam emitted by the infrared light source and the illumination beam emitted by the illumination light source.
16. The lens manufacturing method according to claim 15, wherein, At least two illumination sources are provided on the side of the holographic medium layer away from the human eye.
17. The lens manufacturing method according to claim 14, wherein, The process of illuminating the holographic medium layer with a preset illumination source beam and a reproduction beam, causing the illumination source beam and the reproduction beam to interfere on the holographic medium layer, and obtaining interference information of the illumination source beam and the reproduction beam, includes: The holographic medium layer is illuminated by a preset first exit angle beam, a second exit angle beam, and a reconstructed beam, so that the first exit angle beam, the second exit angle beam, and the reconstructed beam interfere in the holographic medium layer, thereby obtaining interference information for recording the first exit angle beam, the second exit angle beam, and the reconstructed beam.
18. The lens fabrication method according to claim 14, wherein the post-processing of the holographic medium layer includes: The holographic medium layer is subjected to generalized exposure and baking treatment.
19. A near-eye display device, wherein, The near-eye display device includes: The eye-tracking device according to any one of claims 1-13.
20. The near-eye display device according to claim 19, wherein, The near-eye display device also includes a visible light source, which is used to provide virtual images for the near-eye display device.