Optical waveguide device and enhanced display equipment
By designing optical waveguide devices in augmented reality devices, using image elimination components to filter out the image light, the light leakage problem in the device is solved, and image quality and user experience are improved.
Patent Information
- Application Number
- CN202421520145.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-28
AI Technical Summary
Existing augmented reality devices have light leakage, causing user privacy to be threatened.
An optical waveguide device is designed, including a waveguide element and an image cancellation element. The image elimination element is arranged on the side of the waveguide element away from the human eye to selectively filter out the image light to reduce or eliminate light leakage.
Significantly reduce or even eliminate light leakage in augmented reality devices, improve image clarity and contrast, and provide users with a better visual experience.
Smart Images
Figure CN222689929U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of augmented reality display, in particular to an optical waveguide device and an augmented display device. Background Art
[0002] Augmented Reality Device is a technical device that combines virtual information with the real world. It obtains information about the real environment through cameras, sensors, etc., and then superimposes virtual digital content on the real scene through computer graphics and display technology, providing users with a visual experience that combines virtual information with the real world.
[0003] Common augmented reality devices include head-mounted displays, smart glasses, smartphones or tablets, etc. These devices can be applied to many fields such as games, education, medical treatment, industry, navigation, etc., to provide users with richer, more intuitive and useful information. However, in the actual use of these devices, there is a light leakage phenomenon, which allows others to see the image displayed by the device from the outside of the lens, which undoubtedly poses a great threat to the privacy of users. Therefore, it is necessary to improve the existing technology.
[0004] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Utility Model Content
[0005] The utility model provides an optical waveguide device and an enhanced display device to solve the light leakage problem of the augmented reality device in the prior art.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] An optical waveguide device is used to receive image output light from an image source, guide the image output light into the optical waveguide for transmission, and then guide the image output light to a human eye; the optical waveguide device comprises:
[0008] A waveguide element, wherein the waveguide element comprises an in-coupling element adapted to the position of an image source and an out-coupling element adapted to the position of a human eye;
[0009] An image elimination element is arranged on a side of the waveguide element away from the human eye and matches the position of the coupling-out element; the image elimination element is used for selectively filtering the image output light.
[0010] Optionally, the image removal element comprises one or more optical filters.
[0011] Optionally, the optical filter is a filter or a notch plate;
[0012] The optical filter has a first filtering frequency band, a second filtering frequency band and a third filtering frequency band;
[0013] The first filter frequency band, the second filter frequency band and the third filter frequency band are all band-stop, or the first filter frequency band, the second filter frequency band and the third filter frequency band are all band-pass, or the first filter frequency band, the second filter frequency band and the third filter frequency band are a combination of band-stop and band-pass.
[0014] Optionally, the first filter frequency band, the second filter frequency band and the third filter frequency band correspond to a first range of wavelengths, a second range of wavelengths and a third range of wavelengths in three color bands of RGB, respectively.
[0015] Optionally, the optical filter has a first filter frequency band, a second filter frequency band and a third filter frequency band, all of which are band-stops, and the filter frequency band corresponding to the dominant color of the image output light in the first range of wavelengths, the second range of wavelengths and the third range of wavelengths is defined as a main filter frequency band;
[0016] The central wavelength of the main filter frequency band is consistent with the central wavelength of the image output light.
[0017] Optionally, bandwidths of the first filter frequency band, the second filter frequency band, and the third filter frequency band are all greater than or equal to a bandwidth of the image output light.
[0018] Optionally, the image elimination element comprises an optical filter, and the optical filter comprises a micro-nano structure for forming the first filtering frequency band, the second filtering frequency band and the third filtering frequency band.
[0019] Optionally, the image elimination element comprises two coaxial and stacked optical filters;
[0020] One of the optical filters has the first filtering frequency band and the second filtering frequency band, and the other optical filter has the third filtering frequency band.
[0021] Optionally, the image elimination element comprises a plurality of coaxial and stacked optical filters;
[0022] Among them, at least one optical filter has the first filtering frequency band, at least one optical filter has the second filtering frequency band, and at least one optical filter has the third filtering frequency band.
[0023] The utility model also provides an enhanced display device, comprising the optical waveguide device as described in any one of the above items.
[0024] Compared with the prior art, the utility model has the following beneficial effects:
[0025] The utility model provides an optical waveguide device and an enhanced display device, which can significantly reduce or even eliminate the light leakage phenomenon existing in the augmented reality device by setting an image elimination element that matches the position of the coupling-out element, improve the clarity and contrast of the image, and provide users with a better visual experience.
[0026] The present invention has other characteristics and advantages, which will be apparent from the accompanying drawings and subsequent specific embodiments incorporated herein, or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together are used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 It is a structural schematic diagram of an optical waveguide device provided in Embodiment 1 of the present utility model;
[0029] Figure 2 It is a CIExy chromaticity diagram of an image elimination element in an optical waveguide device provided in the first embodiment of the utility model;
[0030] Figure 3 This is an example spectrum diagram of an image elimination element in an optical waveguide device provided in the first embodiment of the utility model;
[0031] Figure 4 This is a schematic diagram of a band stop of an image elimination element in an optical waveguide device provided in the first embodiment of the utility model;
[0032] Figure 5 It is a bandpass schematic diagram of an image elimination element in an optical waveguide device provided in the first embodiment of the utility model;
[0033] Figure 6 It is a combined schematic diagram of a band-stop and a band-pass of an image elimination element in an optical waveguide device provided in the first embodiment of the utility model;
[0034] Figure 7 It is used to form Figure 6 Schematic diagram of the wave pass combination of the mid-band pass;
[0035] Figure 8It is a schematic diagram comparing the light leakage spectra before and after the image elimination element is provided in the first embodiment of the utility model.
[0036] Reference numerals: 10, waveguide element; 11, coupling element; 12, coupling element; 20, image elimination element; 30, image source; 40, human eye. DETAILED DESCRIPTION
[0037] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0038] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0039] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0040] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.
[0041] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0042] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0043] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0044] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0045] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0046] Embodiment 1
[0047] During the use of some augmented reality devices, light leakage may occur, and others can see the displayed image through the outer side of the lens, which may lead to privacy leakage. In order to eliminate the light leakage phenomenon, the utility model proposes a solution, which uses an image elimination element to filter the leaked image, while avoiding the influence of the filtering on the real scene color, so that the lens of the augmented reality device remains transparent.
[0048] Please refer to Figure 1 The embodiment of the utility model provides an optical waveguide device, which aims to solve the light leakage problem of existing augmented reality devices, so as to significantly improve the user's visual experience and device performance. The optical waveguide device is used to receive the image output light from the image source 30, and guide it into the optical waveguide for transmission, and finally guide it to the human eye 40. In this embodiment, the waveguide device is mainly composed of a waveguide element 10 and an image elimination element 20.
[0049] Specifically, the waveguide element 10 includes a coupling element 11 adapted to the position of the image source 30, and a coupling element 12 adapted to the position of the human eye 40. The coupling element 11 can effectively collect the image output light emitted by the image source 30 and introduce it into the optical waveguide; inside the optical waveguide, the image output light is transmitted through optical principles such as total reflection until it reaches the coupling element 12; the coupling element 12 is responsible for exporting the transmitted image output light at a suitable angle and intensity so that it can accurately enter the human eye 40.
[0050] In this embodiment, the image elimination element 20 is arranged on the side of the waveguide element away from the human eye 40, and matches the position of the coupling element 12; specifically, the head portrait elimination element is arranged on the back side of the augmented reality display device, that is, the light leakage side, for selectively filtering the image output light, thereby eliminating the light leakage and filtering the leaked image.
[0051] It is understandable that based on the application scenarios of augmented reality display, in actual applications, it is necessary to maintain a high transmittance of the lens to the real scene and not affect the viewing of the real scene. Therefore, the image elimination element 20 should be transparent, and it should have a high transmittance for the bands outside the light source spectrum. In addition, it is necessary to ensure that the light energy of the three colors of RGB maintain a specific ratio so that the image elimination element 20 can maintain transparency without color deviation.
[0052] In summary, the image elimination element 20 should have a filtering effect on the three primary colors of RGB to ensure that its chromaticity is located at the center point E of the xy chromaticity diagram and to present white. Figure 2 The chromaticity of the light source depends on the relative proportion of the three colors RGB in the spectrum component, and is defined as r=R / (R+G+B), g=G / (R+G+B), and b=B / (R+G+B), that is, r=g=b=0.33 in standard white light; the spectrum example of the image elimination element 20 is shown in FIG. Figure 3 As shown, it shows a cutoff of a certain band for the three primary colors of RGB, and the cutoff of the green band needs to match the wavelength of the light source, so that it can filter the light leakage of the equipment and ensure the transparency of the lens.
[0053] like Figure 8 As stated, Figure 8 It is a schematic diagram of the before and after comparison of the leakage light spectrum. The dotted line part represents the leakage light spectrum without the image elimination element, the horizontal axis is the wavelength, the vertical axis is the normalized energy, and the solid line part represents the spectrum after the image elimination element is set. From the figure, it can be seen that the obvious energy difference, that is, the optical waveguide device provided in the present application has a significant leakage light elimination effect.
[0054] In some possible embodiments of the present application, the image elimination element 20 includes one or more optical filters having a first filter band, a second filter band, and a third filter band corresponding to the first range wavelength, the second range wavelength, and the third range wavelength of the three RGB color bands, respectively.
[0055] In this embodiment, the first filter frequency band, the second filter frequency band and the third filter frequency band are all band-stop, or the first filter frequency band, the second filter frequency band and the third filter frequency band are all band-pass, or the first filter frequency band, the second filter frequency band and the third filter frequency band are a combination of band-stop and band-pass.
[0056] In practical applications, the image output light of the image source 30 has a dominant color, and the optical filter has a first filter frequency band, a second filter frequency band, and a third filter frequency band, all of which are band-stops, and the filter frequency band corresponding to the dominant color in the first filter frequency band, the second filter frequency band, and the third filter frequency band is defined as the main filter frequency band. Specifically, the center wavelength of the main filter frequency band is consistent with the center wavelength of the image output light to achieve accurate filtering of the dominant color light; the principle is that by making the center wavelength of the main filter frequency band coincide with the center wavelength of the image output light, the dominant color light can be attenuated to the greatest extent, thereby effectively reducing light leakage. The other two filter frequency bands are used to compensate for the color of the optical filter in the image elimination element 20, so that the image elimination element 20 is generally transparent.
[0057] Moreover, in the present embodiment, the bandwidths of the first filter frequency band, the second filter frequency band, and the third filter frequency band are all greater than or equal to the bandwidth of the image output light, which means that the optical filter can completely cover the wavelength range of the image output light, ensuring that all relevant light rays of the image output light are adequately filtered and attenuated, thereby achieving more thorough light leakage elimination.
[0058] In summary, the image elimination element 20 has a high transmittance in the visible light range, and has a band stop in each of the three RGB color bands; for example, the first filter frequency band, the second filter frequency band and the third filter frequency band are all band stops. If the light source is green, the center of the green filter frequency band is consistent with the light source, and the bandwidth of the green filter frequency band is greater than or equal to the bandwidth of the light source. The red and blue filter frequency bands are used to compensate for the color of the green filter frequency band to ensure its transparency.
[0059] In this embodiment, the image removal element 20 can be implemented in various forms:
[0060] Method 1: The image elimination element 20 includes an optical filter, which forms a first filter frequency band, a second filter frequency band and a third filter frequency band through a micro-nano structure. Specifically, the micro-nano structure can be a structure such as a metasurface or a photonic crystal, and the band-stop characteristics of multiple bands are achieved through phase regulation. When light is incident on the micro-nano structure, different units will produce specific scattering or reflection effects, thereby forming a filter frequency band at a specific wavelength. By precisely designing the shape, size, arrangement and material of these micro-nano structures, accurate filtering of the three color bands of RGB can be achieved.
[0061] In the second method, the image elimination element 20 includes two coaxial and stacked optical filters, one of which has a first filtering frequency band and a second filtering frequency band, and the other optical filter has a third filtering frequency band. In practical applications, any one of the two optical filters can be arranged on a side close to the waveguide element 10. Please refer to Figure 4 The first filter frequency band, the second filter frequency band and the third filter frequency band are all band stops, and the three band stops are combined into a total spectrum line to achieve the purpose of image filtering.
[0062] This stacked structure of the image elimination element 20 can utilize the selective transmission and blocking characteristics of different filters for light of different wavelengths to achieve step-by-step filtering of the RGB three-color light; in practical applications, by reasonably designing the materials and structural parameters of the two optical filters, they can work together to achieve an ideal light leakage elimination effect.
[0063] Method three includes a plurality of coaxial and stacked optical filters; wherein at least one optical filter has a first filtering frequency band, at least one optical filter has a second filtering frequency band, and at least one optical filter has a third filtering frequency band. Please refer to Figure 4 The first filter frequency band, the second filter frequency band and the third filter frequency band are all band stops, and the three band stops are combined into a total spectrum line to achieve the purpose of image filtering.
[0064] This combination of multiple filters can provide higher filtering accuracy and flexibility, because each filter can be fine-tuned for a specific wavelength range, thereby achieving more precise filtering of the image output light.
[0065] In addition, please refer to Figure 5 , and can also be achieved through four bandpass Figure 4 The total spectrum is used to achieve the purpose of image filtering.
[0066] Specifically, when the image elimination element 20 includes two or more optical filters, its thickness does not exceed 3 mm to ensure that its thickness does not bring too much impact on the augmented reality device.
[0067] Mode 4: the image elimination element 20 adds a wide band pass and a narrow band stop on the basis of the aforementioned narrow filter band modes, such as Figure 6 As shown, by setting a wide bandwidth to allow most of the light to pass through, the brightness and clarity of the image are guaranteed; at the same time, a narrow filter frequency band is used to attenuate or reflect light of a specific wavelength to prevent light leakage.
[0068] Among them, the broadband pass can be formed by superposition of two wave passes, such as Figure 7 shown.
[0069] It can be understood that the narrow filter frequency band filters specific wavelengths that may cause light leakage, attenuating these wavelengths of light to an extremely low level, thereby reducing or eliminating the light leakage phenomenon, while the wide band pass covers the main color and brightness information of the image, allowing the image to be displayed normally, thereby effectively eliminating light leakage while ensuring image quality. This method can achieve precise suppression of light leakage and improve image contrast and clarity by reasonably designing the parameters of the wide band pass and narrow filter frequency band.
[0070] In this embodiment, the optical filter can be a filter or a notch plate. It is understandable that the filter usually realizes the filtering function by absorbing or reflecting light of a specific wavelength, while the notch plate can strongly attenuate a very narrow wavelength range.
[0071] The embodiments of the present utility model have the following beneficial effects:
[0072] 1) It can effectively solve the light leakage problem: by setting the image elimination element 20, the image elimination element 20 includes a plurality of specific optical filter frequency bands, which can significantly reduce or even eliminate the light leakage phenomenon of the image output light in the augmented reality device, improve the clarity and contrast of the image, and provide users with a better visual experience.
[0073] 2) Adaptable to different image sources 30: Regardless of the color characteristics of the image source 30, the versatility and applicability of the product can be improved by flexibly adjusting the filtering frequency band parameters of the optical filter to adapt to different image sources 30.
[0074] Embodiment 2
[0075] Based on the above embodiments, the present utility model provides an enhanced display device, comprising the above optical waveguide device. By setting the waveguide device provided by the above embodiments in the enhanced display device, the light leakage phenomenon of the image output light can be effectively eliminated, so that the enhanced display device presents a clearer and more realistic virtual image, significantly improving the user experience.
[0076] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.
Claims
1. An optical waveguide device, the optical waveguide device is used to receive image output light from an image source, guide the image output light into the optical waveguide for transmission, and then guide it out to the human eye; characterized in that: The optical waveguide device comprises: A waveguide element, wherein the waveguide element comprises an in-coupling element adapted to the position of an image source and an out-coupling element adapted to the position of a human eye; An image elimination element is arranged on a side of the waveguide element away from the human eye and matches the position of the outcoupling element; the image elimination element is used for selectively filtering the image output light.
2. The optical waveguide device according to claim 1, characterized in that The image removal element includes one or more optical filters.
3. The optical waveguide device according to claim 2, characterized in that The optical filter is a filter or a notch plate; The optical filter has a first filtering frequency band, a second filtering frequency band and a third filtering frequency band; The first filter frequency band, the second filter frequency band and the third filter frequency band are all band-stop, or the first filter frequency band, the second filter frequency band and the third filter frequency band are all band-pass, or the first filter frequency band, the second filter frequency band and the third filter frequency band are a combination of band-stop and band-pass.
4. The optical waveguide device according to claim 3, characterized in that The first filter frequency band, the second filter frequency band and the third filter frequency band correspond to the first range wavelength, the second range wavelength and the third range wavelength in the three color bands of RGB respectively.
5. The optical waveguide device according to claim 4, characterized in that The optical filter has a first filter frequency band, a second filter frequency band and a third filter frequency band, all of which are band-stops, and the filter frequency band corresponding to the dominant color of the image output light in the first range of wavelengths, the second range of wavelengths and the third range of wavelengths is defined as a main filter frequency band; The central wavelength of the main filter frequency band is consistent with the central wavelength of the image output light.
6. The optical waveguide device according to claim 5, characterized in that The bandwidths of the first filter frequency band, the second filter frequency band, and the third filter frequency band are all greater than or equal to the bandwidth of the image output light.
7. The optical waveguide device according to claim 3, characterized in that The image elimination element comprises an optical filter, and the optical filter comprises a micro-nano structure for forming the first filtering frequency band, the second filtering frequency band and the third filtering frequency band.
8. The optical waveguide device according to claim 3, characterized in that The image elimination element includes two coaxial and stacked optical filters; One of the optical filters has the first filtering frequency band and the second filtering frequency band, and the other optical filter has the third filtering frequency band.
9. The optical waveguide device according to claim 3, characterized in that The image elimination element includes a plurality of coaxial and stacked optical filters; Among them, at least one optical filter has the first filtering frequency band, at least one optical filter has the second filtering frequency band, and at least one optical filter has the third filtering frequency band.
10. An enhanced display device, characterized in that: The optical waveguide device comprises the optical waveguide device as claimed in any one of claims 1 to 9.