A near-eye display device

Abstract

The utility model discloses a kind of near-eye display devices, including lens main body, the lens main body has coupling-out area and coupling-in area;The coupling-in area is configured to carry out waveguide propagation to light rays;The coupling-out area is configured to reflect the light rays of waveguide propagation into human eye;The coupling-in area is optical coupling structure, the coupling-out area is equipped with optical fiber sheet structure, the optical fiber sheet structure is configured to collect large-angle light rays, the utility model can be through the setting of optical fiber sheet structure, to collect large-angle light rays, i.

Description

Technical Field

[0001] This utility model relates to the field of display devices, and in particular to a near-eye display device. Background Technology

[0002] Currently, there are two main types of optical waveguide lens technologies used in near-eye displays for augmented reality (AR) glasses: geometric array optical waveguides, which are suitable for guiding light from large-sized PGUs (image generation units, i.e., light sources and display engines) into the human eye; and diffractive optical waveguides, which use the principle of optical diffraction to transmit light.

[0003] A representative example is patent document CN202421242913.X, which discloses an AR glasses and display system. The AR glasses include: a frame module, which is used to provide wear support for a target object; an optical waveguide lens, which is mounted on the frame module and has an input grating region and an output grating region; a first display module and a second display module, which are connected to opposite sides of the frame module and disposed opposite to the input grating region. The first display module and the second display module are used to synchronously output optical signals to the input grating region; wherein the optical waveguide lens is configured to: propagate the optical signal input to the input grating region to the output grating region and output it from the output grating region.

[0004] The aforementioned patent documents disclose AR glasses and display systems using optical waveguide lenses, but there are still limitations in their practical use, as follows:

[0005] First, the integration of large-size PGUs (specifically for geometric array waveguides): Integrating large-size PGUs (to ensure display performance), using a geometric array waveguide solution inevitably results in a bulky and heavy system. This leads to a complex and costly manufacturing process, and presents significant manufacturing challenges.

[0006] The second issue is color display and precision manufacturing (specifically for diffractive waveguides): In color (multi-wavelength) displays, significant color shifts or distortions (color aberrations) can occur, affecting visual fidelity. The manufacturing of the subwavelength diffractive elements on which they rely requires extreme precision (subwavelength scale structures are needed), making mass production very difficult and costly (precision manufacturing is challenging).

[0007] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0008] Therefore, it is necessary to provide a near-eye display device to address the aforementioned technical problems.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A near-eye display device includes a lens body having an outgoing region and an incoming region;

[0011] The coupling region is configured to propagate light through a waveguide.

[0012] The coupling region is configured to reflect light propagating from the waveguide into the human eye;

[0013] The coupling-in region is an optical coupling structure, and the coupling-out region is provided with an optical fiber thin film structure, which is configured to collect light rays at large angles.

[0014] The explanations related to the above content are as follows:

[0015] In the above scheme, the main component of the fiber optic sheet structure is the optical fiber. Light emitted from an object enters the fiber. Due to the difference between the refractive index n1 of the fiber and the refractive index n2 of the material surrounding the fiber, the light undergoes total internal reflection inside the fiber and finally enters the human eye. The numerical aperture NA of the optical fiber is NA = sqr(n1^2 - n2^2). The greater the difference between n1 and n2, the larger the numerical aperture, meaning the fiber can capture more light (mainly large-angle light).

[0016] In the above scheme, large-angle light can be collected by setting up a fiber optic thin-film structure, that is, by using fiber optic waveguides. This solves the problems of bulky size and high manufacturing difficulty of using geometric array waveguides for large-size PGUs, as well as the problems of color shift of different wavelengths (color PGUs) in diffraction waveguides and the high difficulty of precision manufacturing of subwavelength diffraction structures.

[0017] In a further technical solution, the optical fiber sheet structure includes a substrate film, on which optical microstructures are provided to capture large-angle light.

[0018] In a further technical solution, the substrate film is fabricated from an optical fiber bundle via wire cutting, and the area of ​​the substrate film is less than or equal to the area of ​​the coupling region. This design allows the substrate film to reflect light across the entire coupling region.

[0019] In a further technical solution, the optical fiber bundle is composed of multiple optical fibers bonded together in sequence, with the upper and lower end faces of all the optical fibers flush.

[0020] A further technical solution is that, after the fiber bundle is wire-cut, it has a detachment block and a retention block, and the optical microstructure is the fiber on the detachment block.

[0021] In a further technical solution, the optical coupling structure is a prism structure.

[0022] In a further technical solution, the optical coupling structure is a diffractive waveguide structure, such as a surface relief grating or a volume holographic grating.

[0023] Specifically, by employing a fiber optic thin-film structure as the optical waveguide transmission medium, this solution achieves efficient capture and transmission of large-angle incident light (achieved by the fiber optic points, i.e., the fiber optic points or surface microstructures on the detached block), while overcoming the inherent defects of traditional solutions: 1. Size and process issues: Geometric array optical waveguides rely on multi-layer mirror stacking to achieve a large field of view, resulting in a bulky module and high assembly precision requirements; while the fiber optic thin-film structure compresses the light guide layer thickness to only a single-layer substrate film, directly guiding large-angle light through the micro-nano structures at the fiber optic points, avoiding complex optical stacking, and significantly reducing manufacturing difficulty and cost. 2. Dispersion and manufacturing bottlenecks: Diffractive waveguides rely on subwavelength gratings for beam splitting, resulting in color dispersion (red / green / blue light separation) of different wavelengths, requiring precise compensation design and exhibiting color uniformity issues; the fiber optic thin-film, based on the principle of total internal reflection, transmits light without wavelength dependence, eliminating the risk of color shift from a physical mechanism, while avoiding the ultra-precision processes such as nanoimprinting / electron beam lithography required by diffraction schemes.

[0024] In a further technical solution, the surface of the lens body is provided with a guide portion around the coupling-out area and / or coupling-in area to help the user's viewing angle remain in the area where the coupling-out area is located.

[0025] Users may experience their pupils slightly shifting away from the coupling zone during use. To address this issue, a guide unit helps keep the user's gaze within the coupling zone.

[0026] In a further technical solution, the guide portion includes guide rings arranged sequentially from the inside to the outside with the coupling area as the center, and a warning color layer is provided on the guide rings.

[0027] The guide ring helps the user's pupils to focus on the outgoing area without obstructing other parts of the lens, while the warning color layer helps the user know where the viewing angle is.

[0028] However, in this case, light from other parts of the lens body can easily interfere with the user.

[0029] In a further technical solution, the guide portion includes color zones arranged sequentially from the inside out, centered on the coupling area;

[0030] The color area includes a light color area located on the inner side and a dark color area located on the outer side of the light color area.

[0031] The setting of light and dark color zones can help users see the coupling zone directly with their pupils without light interfering with the user. However, the observation range of the main body of the lens is smaller, which is not conducive to long-term use. Therefore, it should be used according to specific needs.

[0032] It's important to note that on the main body of the lens, specifically the side of the AR lens closest to the eye, a thin fiber optic sheet structure, pre-cut into slices, is glued on. This fiber optic sheet structure serves as the light output area. The light input area can use a traditional prism method. The image light generated by the PGU enters the lens through the input area (prism or diffractive waveguide), propagates through the waveguide in the lens, reaches the fiber bundle area, is coupled out, and then enters the eye.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention can collect light at large angles by setting up a thin fiber optic structure, that is, by using a fiber optic waveguide. This solves the problems of bulkiness and high manufacturing difficulty of using geometric array waveguides for large-size PGUs, as well as the problems of color shift of different wavelengths (color PGUs) in diffraction waveguides and the high difficulty of precision manufacturing of subwavelength diffraction structures. Attached Figure Description

[0035] Figure 1 A schematic diagram of the main structure of the lens provided by this utility model;

[0036] Figure 2 A schematic diagram illustrating the principle of the optical microstructure for collecting large-angle light provided by this utility model;

[0037] Figure 3 This is a schematic diagram of the fiber optic bundle block structure provided by this utility model; (the horizontal lines indicate cutting).

[0038] Figure 4 A schematic diagram illustrating the working principle of the lens body provided by this utility model;

[0039] Figure 5 A schematic diagram of the guide ring structure provided by this utility model;

[0040] Figure 6 A schematic diagram of the shallow color area structure provided by this utility model.

[0041] The markings in the diagram are explained as follows:

[0042] 1. Lens body; 2. Outgoing area; 3. Ingoing area; 4. Matrix film; 5. Optical microstructure; 6. Fiber bundle; 7. Guide ring; 8. Warning color layer; 9. Light color area; 10. Dark color area. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0044] As mentioned in the background section, the first issue is the integration of large-size PGUs (for geometric array waveguides): In order to integrate large-size PGUs (to ensure display performance), using a geometric array waveguide solution inevitably results in a bulky and cumbersome system. This leads to a complex and costly manufacturing process, and high manufacturing difficulty. The second issue is color display and precision manufacturing (for diffractive waveguides): In color (multi-wavelength) displays, significant color shifts or distortions (color aberrations) occur, affecting visual fidelity. The manufacturing of the subwavelength diffractive elements required demands extreme precision (requiring subwavelength scale structures), making mass production very difficult and costly (due to the high difficulty of precision manufacturing).

[0045] To solve this technical problem, this utility model provides a near-eye display device.

[0046] For details, please refer to Figure 1-6 A near-eye display device includes a lens body 1, wherein the lens body 1 has an outgoing region 2 and an incoming region 3;

[0047] The coupling region 3 is configured to propagate light through a waveguide.

[0048] The coupling region 2 is configured to reflect light propagating from the waveguide into the human eye;

[0049] The coupling region 3 is an optical coupling structure, and the coupling region 2 is provided with an optical fiber thin film structure, which is configured to collect light at a large angle.

[0050] In this embodiment, the main component of the fiber optic sheet structure is the optical fiber. Light emitted from an object enters the optical fiber. Due to the difference between the refractive index n1 of the optical fiber and the refractive index n2 of the material surrounding the optical fiber, the light undergoes total internal reflection inside the optical fiber and finally enters the human eye. The numerical aperture NA of the optical fiber is sqr(n1^2-n2^2). The greater the difference between n1 and n2, the larger the numerical aperture, which means that the optical fiber can capture more light (mainly large-angle light).

[0051] In this embodiment, large-angle light can be collected by setting up a fiber optic thin-film structure, that is, by using fiber optic waveguides. This solves the problems of bulky size and high manufacturing difficulty of using geometric array waveguides for large-size PGUs, as well as the problems of color shift of different wavelengths (color PGUs) in diffraction waveguides and the high difficulty of precision manufacturing of subwavelength diffraction structures.

[0052] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0053] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0055] First Embodiment

[0056] A near-eye display device includes a lens body 1, wherein the lens body 1 has an outgoing region 2 and an incoming region 3;

[0057] The coupling region 3 is configured to propagate light through a waveguide.

[0058] The coupling region 2 is configured to reflect light propagating from the waveguide into the human eye;

[0059] The coupling region 3 is an optical coupling structure, and the coupling region 2 is provided with an optical fiber thin film structure, which is configured to collect light at a large angle.

[0060] In this embodiment, the main component of the fiber optic sheet structure is the optical fiber. Light emitted from an object enters the optical fiber. Due to the difference between the refractive index n1 of the optical fiber and the refractive index n2 of the material surrounding the optical fiber, the light undergoes total internal reflection inside the optical fiber and finally enters the human eye. The numerical aperture NA of the optical fiber is sqr(n1^2-n2^2). The greater the difference between n1 and n2, the larger the numerical aperture, which means that the optical fiber can capture more light (mainly large-angle light).

[0061] In this embodiment, large-angle light can be collected by setting up a fiber optic thin-film structure, that is, by using fiber optic waveguides. This solves the problems of bulky size and high manufacturing difficulty of using geometric array waveguides for large-size PGUs, as well as the problems of color shift of different wavelengths (color PGUs) in diffraction waveguides and the high difficulty of precision manufacturing of subwavelength diffraction structures.

[0062] In a further technical solution, the optical fiber sheet structure includes a substrate film 4, on which an optical microstructure 5 is provided to capture large-angle light.

[0063] In a further technical solution, the substrate film 4 is fabricated from the fiber bundle 6 by wire cutting, and the area of ​​the substrate film 4 is less than or equal to the area of ​​the coupling region 2. This design allows the substrate film 4 to reflect light from the entire coupling region 2.

[0064] In a further technical solution, the optical fiber bundle 6 is composed of multiple optical fibers bonded together in sequence, with the upper and lower end faces of all the optical fibers being flush.

[0065] In a further technical solution, the fiber bundle block 6, after being wire-cut, has a detachment block and a retention block, and the optical microstructure 5 is the fiber on the detachment block.

[0066] In a further technical solution, the optical coupling structure is a prism structure.

[0067] In a further technical solution, the optical coupling structure is a diffractive waveguide structure, such as a surface relief grating or a volume holographic grating.

[0068] Specifically, by employing a thin fiber structure as the optical waveguide transmission medium, this scheme achieves efficient capture and transmission of large-angle incident light (achieved by the fiber's point or surface microstructures), while overcoming the inherent defects of traditional schemes.

[0069] 1. Size and manufacturing process issues: Geometric array optical waveguides rely on stacked multi-layer reflectors to achieve a large field of view, resulting in a bulky module and high assembly precision requirements; while the fiber optic thin-film structure compresses the thickness of the light guide layer to only a single-layer substrate film 4, and guides large-angle light directly through the micro-nano structure at the fiber point, avoiding complex optical stacking and significantly reducing manufacturing difficulty and cost.

[0070] 2. Dispersion and manufacturing bottlenecks: Diffractive waveguides rely on subwavelength gratings for beam splitting, resulting in color dispersion (red / green / blue light separation) of different wavelengths. This requires precise compensation design and presents color uniformity issues. Fiber optic sheets, based on the principle of total internal reflection, conduct light without wavelength dependence, eliminating the risk of color shift from a physical mechanism. They also avoid the ultra-precision processes such as nanoimprinting / electron beam lithography required by diffraction schemes.

[0071] Second Embodiment

[0072] Further optimization of the near-eye display device provided in Embodiment 1, in a further technical solution, the surface of the lens body 1 is provided with a guide portion around the coupling-out region 2 and / or coupling-in region 3 to assist the user's viewing angle in the area where the coupling-out region 2 is located.

[0073] When using the device, users may experience a slight shift of their pupils away from the coupling zone 2. To address this issue, a guide unit is used to assist users in keeping their field of vision within the area where the coupling zone 2 is located.

[0074] In a further technical solution, the guide section includes guide rings 7 arranged sequentially from the inside to the outside with the coupling area 2 as the center, and a warning color layer 8 is provided on the guide rings 7.

[0075] The guide ring 7, without obstructing other parts of the lens body 1, can assist the user's pupils in looking directly at the coupling zone 2, while the warning color layer 8 helps the user know where the viewing angle is.

[0076] However, in this case, the light from other parts of the lens body 1 can easily interfere with the user.

[0077] Third Embodiment

[0078] In a further technical solution, the guide portion includes color zones arranged sequentially from the inside out, centered on the coupling area 2;

[0079] The color area includes a light color area 9 located on the inner side and a deep color area 10 located on the outer side of the light color area 9.

[0080] The setting of the light color zone 9 and the dark color zone 10 can help the user's pupils to look directly at the coupling zone 2 without any light interference to the user. However, the observation range of the lens body 1 is smaller, which is not conducive to long-term use. Therefore, it should be used according to the needs in specific applications.

[0081] The near-eye display device provided by this utility model is used as follows: A thin fiber optic sheet structure, pre-cut into slices, is glued to the lens body 1, specifically the side of the AR lens closest to the human eye. This fiber optic sheet structure serves as the light output region 2. The light input region 3 can use a traditional prism method. The image light generated by the PGU enters the lens through the input region 3 (prism or diffractive waveguide), propagates through the waveguide in the lens, reaches the fiber bundle region, is coupled out, and then enters the human eye.

[0082] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0083] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A near-eye display device, characterized in that, It includes a lens body (1), which has an outgoing region (2) and an incoming region (3). The coupling region (3) is configured to propagate light through a waveguide; The coupling region (2) is configured to reflect light propagating from the waveguide into the human eye; The coupling region (3) is an optical coupling structure, and the coupling region (2) is provided with an optical fiber sheet structure, which is configured to collect light at a large angle.

2. The near-eye display device according to claim 1, characterized in that, The fiber optic sheet structure includes a substrate film (4), on which optical microstructures (5) are provided to capture large-angle light.

3. The near-eye display device according to claim 2, characterized in that, The substrate film (4) is made by wire cutting of the fiber bundle block (6), and the area of ​​the substrate film (4) is less than or equal to the area of ​​the coupling region (2).

4. The near-eye display device according to claim 3, characterized in that, The fiber bundle (6) is composed of multiple optical fibers bonded together in sequence, with the upper and lower ends of all the optical fibers being flush.

5. The near-eye display device according to claim 4, characterized in that, After wire cutting, the fiber bundle block (6) has a detachment block and a retention block, and the optical microstructure (5) is the fiber on the detachment block.

6. The near-eye display device according to claim 1, characterized in that, The optical coupling structure is a prism structure.

7. The near-eye display device according to claim 1, characterized in that, The optical coupling structure is a diffractive waveguide structure.

8. The near-eye display device according to claim 1, characterized in that, The surface of the lens body (1) is provided with a guide portion around the coupling-out area (2) and / or coupling-in area (3) to help the user's viewing angle remain in the area where the coupling-out area (2) is located.

9. The near-eye display device according to claim 8, characterized in that, The guide section includes guide rings (7) arranged sequentially from the inside to the outside with the coupling area (2) as the center, and a warning color layer (8) is provided on the guide rings (7).

10. The near-eye display device according to claim 8, characterized in that, The guide section includes color zones arranged sequentially from the inside to the outside with the coupling area (2) as the center; The color area includes a light color area (9) located on the inside and a deep color area (10) located on the outside of the light color area (9).

Images