Anti-ultraviolet multifunctional holographic multiplexing glasses system and holographic multiplexing method thereof
By designing a multi-function holographic multiplexed glasses system, combining the near-eye display module, purple-mounted protection module and external light collection module, the challenges of the near-eye display system in ultraviolet protection and power management are solved, and a safer, healthier and more practical near-eye display effect is achieved.
Patent Information
- Application Number
- CN202411948844.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-05-13
Smart Images

Figure CN119987026A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of information optical technology, and in particular to a multifunctional holographic multiplexing eyeglass system capable of preventing ultraviolet rays and a holographic multiplexing method thereof. Background Art
[0002] Near-eye display systems are expected to become the next generation of mobile computing platforms and user terminals, which can superimpose auxiliary virtual information on real scenes to achieve a display effect that integrates the real and the virtual. Near-eye display systems are developing in the direction of miniaturization, lightness, and multi-functionality, showing great application prospects in education and training, entertainment and publicity, and individual combat. At present, in the process of productization of near-eye display systems, humanized design and power management are the main problems they face.
[0003] UV protection is a major factor that needs to be considered in the humanized design of near-eye display systems. Among the possible applications of near-eye display systems, a large part of the use scenarios are outdoors. The ultraviolet light in the sunlight, due to its short wavelength and high energy, can cause chronic ultraviolet damage to the human eye and lead to a variety of eye diseases such as retinal damage. Integrating UV protection functions is conducive to improving the safety and health of near-eye display systems. Existing UV protection devices are made of organic materials or absorbers, which will hinder the transmission of visible light and affect the human eye's observation of the outside world.
[0004] Short battery life, heavy weight and easy heating are the main challenges facing power management of near-eye display systems. If near-eye display systems want to become the next generation of user terminals, they need to be able to be worn and used continuously by users for a long time. However, the battery life of products currently on the market is only about 2 hours, which requires users to charge them frequently, affecting the continuity of use. System weight is a very important factor affecting wearing comfort. Usually the battery accounts for more than half of the total weight, resulting in a heavy head load when worn. In addition, the continuous heating of the battery during the power supply process will cause a negative user experience for the user.
[0005] In view of the above problems, the present invention aims to provide a multifunctional holographic multiplexing glasses system and a holographic multiplexing method thereof which can protect against ultraviolet rays, so as to solve one or more of the above technical problems. Summary of the invention
[0006] The purpose of this application is to solve one of the above-mentioned technical problems at least to a certain extent.
[0007] To this end, the first purpose of the present application is to propose a multifunctional holographic multiplexing glasses system that can protect against ultraviolet rays, and the second purpose of the present application is to propose a holographic multiplexing method of multifunctional holographic multiplexing glasses that can protect against ultraviolet rays.
[0008] In order to achieve the above-mentioned purpose, the first embodiment of the present application proposes a multifunctional holographic multiplexed glasses system that can prevent ultraviolet rays, comprising:
[0009] A near-eye display module (100), an ultraviolet protection module (200) and an external light collection module (300).
[0010] The near-eye display module (100) comprises an image source (101) and a holographic light guide module (102), wherein the holographic light guide module (102) comprises a holographic optical element (103) and a first light guide element (104). The holographic light guide module (102) guides the image source (101) to the human eye and provides virtual information to the human eye.
[0011] The ultraviolet protection module (200) comprises a multiplexed holographic optical element (201) and a second light guide element (202) attached to the surface of the glasses. The ultraviolet protection module (200) reflects most of the ultraviolet band components in the external light away from the human eye, and guides light of other bands to a specific position.
[0012] The external light collection module (300) comprises a photoelectric conversion module (301) and a battery (302). The photoelectric conversion module (301) converts the light collected by the holographic optical element (201) into electrical energy and stores it in the battery.
[0013] Optionally, the image source (101) is any one of an LCD display, an LED display, a CRT display, an OLED display, a mini-LED display, a micro-LED display, a micro-OLED display, a plasma display, a field-induced display, a light-emitting polymer display, a projector, and a projection component.
[0014] Optionally, the holographic light guide module (102) is attached to the eyeglass lens and is a holographic optical element (103) or a combination of a holographic optical element (103) and a first light guide element (104).
[0015] When it is a holographic optical element (103), the holographic optical element receives the target image light generated by the image source (101), and deflects the target image light to the human eye.
[0016] When the holographic optical element (103) and the first light guide element (104) are combined, the holographic optical element (103) receives the target image light generated by the image source (101) and diffracts the target image light into the light guide element.
[0017] Optionally, the light guiding element is any one of a planar waveguide, a cylindrical waveguide or a free-form waveguide.
[0018] Optionally, the holographic optical elements in the holographic light guide module (102) and the ultraviolet protection module (200) realize functional multiplexing by means of single-layer wavefront multiplexing, single-layer wavelength multiplexing, single-layer angle multiplexing or multi-layer spatial stacking.
[0019] Optionally, when the holographic light guide module (102) and the holographic optical elements in the ultraviolet protection module (200) are multiplexed in a multi-layer spatial stacking manner to achieve functional multiplexing, the holographic light guide module (102) and the holographic optical elements in the ultraviolet protection module (200) may be located on the same side or on different sides of the glasses glass.
[0020] Optionally, the multiplexed holographic optical element (201) in the ultraviolet protection module (200) is attached to the eyeglass lens and is a multiplexed holographic optical element or a combination of the multiplexed holographic optical element (201) and the second light guide element (202).
[0021] When it is a multiplexed holographic optical element (201), the multiplexed holographic optical element (201) reflects most of the ultraviolet band components in the external light away from the human eye, and guides light in other bands to a specific position.
[0022] When the multiplexed holographic optical element (201) and the second light guide element (202) are combined, the multiplexed holographic optical element (201) reflects most of the ultraviolet band components in the external light away from the human eye, and diffracts light in other bands into the second light guide element (202).
[0023] Optionally, the multiplexed holographic optical element (201) in the ultraviolet protection module (200) realizes functional multiplexing by means of single-layer wavefront multiplexing, single-layer wavelength multiplexing, single-layer angle multiplexing, single-layer space partition multiplexing or multi-layer space stacking.
[0024] Optionally, when both the holographic light guide module (102) and the ultraviolet protection module (200) use light guide elements, the two may share the same light guide element or respectively use different light guide elements.
[0025] The embodiment of the present application is a multifunctional holographic multiplexing glasses system that can protect against ultraviolet rays. The system includes: a near-eye display module, an ultraviolet protection module, and an external light collection module. The near-eye display module includes an image source and a holographic light guide module. The ultraviolet protection module is a multiplexed holographic optical element attached to the surface of the glasses. The external light collection module includes a photoelectric conversion module and a battery. While realizing near-eye display, the system and method reduce the damage of external ultraviolet light to the human eye, and at the same time alleviate many problems in the power management of the near-eye display system, thereby enhancing the practicality of the near-eye display system.
[0026] In order to achieve the above-mentioned purpose, the second embodiment of the present application proposes a holographic multiplexing method of multifunctional holographic multiplexing glasses capable of preventing ultraviolet rays, comprising the following steps:
[0027] S1: The image source (101) generates a target image, and the holographic light guide module (102) guides the light of the target image to the human eye.
[0028] S2 The ultraviolet protection module (200) reflects most of the ultraviolet band components in the external light away from the human eye.
[0029] S3: The ultraviolet protection module (200) guides light of other wavelength bands to a specific position.
[0030] S4 The photoelectric conversion module (300) converts the light collected by the holographic optical element into electrical energy and stores it in a battery.
[0031] The embodiment of the present application provides a holographic multiplexing method for multifunctional holographic multiplexing glasses that can protect against ultraviolet rays. The holographic light guide module guides the image source to the human eye to provide virtual information to the human eye. The ultraviolet protection module reflects most of the ultraviolet band components in the external light away from the human eye, and guides light in other bands to a specific location. The external light collection module converts the light collected by the holographic optical element into electrical energy and stores it in a battery. While achieving near-eye display, the system and method reduce the damage of external ultraviolet light to the human eye, and at the same time alleviate many problems in the power management of the near-eye display system, thereby enhancing the practicality of the near-eye display system. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0033] Figure 1 It is a schematic structural diagram of a multifunctional holographic multiplexed glasses system capable of protecting against ultraviolet rays according to an embodiment of the present application;
[0034] Figure 2 is a schematic diagram of an embodiment of the present application in which an ultraviolet protection module includes a light guide element and a near-eye display module does not include a light guide element;
[0035] Figure 3 is a schematic diagram of an embodiment of the present application in which the ultraviolet protection module includes no light-guiding element and the near-eye display module includes a light-guiding element;
[0036] Figure 4 is a schematic diagram of an embodiment of the present application in which an ultraviolet protection module and a near-eye display module both include light guide elements;
[0037] Figure 5It is a schematic diagram of a UV-proof multifunctional holographic multiplexing glasses system suppressing stray light according to an embodiment of the present application;
[0038] Figure 6 This is a process of a holographic multiplexing method of multifunctional holographic multiplexing glasses capable of protecting against ultraviolet rays according to an embodiment of the present application; Specific embodiments
[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0040] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.
[0041] The following describes the UV-proof multifunctional holographic multiplexing glasses system and holographic multiplexing method thereof according to an embodiment of the present application with reference to the accompanying drawings.
[0042] Figure 1 The present invention is a schematic diagram of the structure of a multifunctional holographic multiplexed glasses system capable of protecting against ultraviolet rays according to an embodiment of the present application. The system comprises a near-eye display module (100), an ultraviolet protection module (200) and an external light collection module (300). The near-eye display module (100) comprises an image source (101) and a holographic light guide module (102). The holographic light guide module (102) comprises a holographic optical element (103). The ultraviolet protection module (200) comprises a multiplexed holographic optical element (201) bonded to the surface of the glasses. The external light collection module (300) comprises a first photoelectric conversion module (301a), a second photoelectric conversion module (301b) and a battery (302). The schematic diagram only shows half of the glasses system, and the structure of the other lens is symmetrical to this.
[0043] Furthermore, the holographic optical element (103) is attached to the inner side of the lens, and the multiplexed holographic optical element (201) is attached to the outer side of the lens. The image source (101) and the battery (302) are located on the temples. The first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) are respectively located on the upper and lower sides of the lens, and the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) both extend a distance toward the inner side of the lens.
[0044] The above mainly introduces the specific composition of the multifunctional holographic multiplexed glasses system that can protect against ultraviolet rays. The following will further describe the working principle of the multifunctional holographic multiplexed glasses system that can protect against ultraviolet rays.
[0045] The image source (101) generates a target image and projects it onto a holographic optical element (103). The holographic optical element (103) diffracts the light of the target image into a human eye (105), and the human eye can simultaneously observe real scenes in the outside world and a virtual target image. When a user wears glasses in an outdoor environment, sunlight irradiates the multiplexed holographic optical element (201). The first holographic optical element (201a) in the multiplexed holographic optical element (201) reflects most of the light in the ultraviolet band of the sunlight, thereby protecting the human eye from damage by ultraviolet rays. The second holographic optical element (201b) in the multiplexed holographic optical element (201) guides light of other wavelength bands to the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b); the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) convert the collected light into electrical energy and store it in the battery (302); and the battery (302) supplies power to the image source (101).
[0046] Specifically, the phase of the first holographic optical element (201a) is optimized to reflect ultraviolet light in a widest possible angle range, and the phase of the second holographic optical element (201b) is optimized to guide light in a widest possible spectral range and a widest possible angle range to the photoelectric conversion module (301).
[0047] In another embodiment of the present application, Figure 2As shown, the ultraviolet protection module (200) includes a light guide element (202) while the near-eye display module (100) does not include a light guide element (104). The structure and function of the near-eye display module are the same as those of the previous embodiment and are not described in detail here. The ultraviolet protection module (200) includes a multiplexed holographic optical element (201) and a second light guide element (202) attached to the outer surface of the glasses, wherein the second light guide element (202) is the lens itself. When sunlight irradiates the multiplexed holographic optical element (201), the first holographic optical element (201a) in the multiplexed holographic optical element (201) reflects most of the ultraviolet light in the sunlight, thereby protecting the human eye from damage by ultraviolet rays. The second holographic optical element (201b) in the multiplexed holographic optical element (201) diffracts light of other wavelength bands into the second light-guiding element (202), wherein light satisfying the total reflection condition is transmitted in the second light-guiding element (202) and coupled out at the edge of the second light-guiding element (202). The coupled-out light is irradiated on the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) located on the upper and lower sides of the second light-guiding element (202), and the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) convert the collected light into electrical energy and store it in the battery (302), and the battery (302) supplies power to the image source (101).
[0048] Specifically, since the collected light is transmitted in the second light guide element (202), the range of the output light is limited to an order of magnitude equivalent to the thickness of the second light guide element (202). Therefore, the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) can use a narrower size than the previous embodiment.
[0049] In another embodiment of the present application, Figure 3 As shown, the ultraviolet protection module (200) does not include a light guide element (202), while the near-eye display module (100) includes a light guide element (104). The structure and function of the ultraviolet protection module (200) are the same as those of the first embodiment, and are not described in detail here. The near-eye display module (100) includes an image source (101) and a holographic light guide module (102), wherein the holographic light guide module (102) includes a holographic optical element (103) and a first light guide element (104), wherein the first light guide element (104) is a lens itself. The holographic optical element (103) includes a first holographic optical element (103a) and a second holographic optical element (103b).
[0050] Specifically, the image source (101) generates a target image and projects it onto a first holographic optical element (103a), and the first holographic optical element (103a) diffracts the light of the target image into the first light guide element (104), and the angle of the diffracted light needs to meet the total reflection condition. The diffracted light is transmitted through the first light guide element (104) and coupled out by the second holographic optical element (103b), and the coupled out light is received by the human eye, and the human eye can simultaneously observe the real scene of the outside world and the virtual target image.
[0051] In another embodiment of the present application, Figure 4 As shown, the ultraviolet protection module (200) and the near-eye display module (100) both include light guide elements. The structure and function of the ultraviolet protection module (200) are the same as those of the second embodiment, and the structure and function of the near-eye display module (100) are the same as those of the first embodiment, which will not be described in detail herein. The first light guide element (104) and the second light guide element (202) are the same element, both of which are lenses themselves.
[0052] In another embodiment of the present application, the UV-proof multifunctional holographic multiplexing glasses system can suppress the interference of stray light caused by external light on the human eye. The following is an example of a structure in which neither the UV protection module nor the near-eye display module includes a light guide element. Figure 5 As shown, the system structure is the same as that of the first embodiment, and will not be described in detail here. The following will further describe the working principle of the multifunctional holographic multiplexing glasses system that can protect against ultraviolet rays. The image source (101) generates a target image and projects it onto the holographic optical element (103). The holographic optical element (103) diffracts the light of the target image into the human eye (105), and the human eye can simultaneously observe the real scene of the outside world and the virtual target image. When the user wears the glasses in an outdoor environment, the external sunlight may shine on the multiplexing type holographic optical element (201) from all directions. The external light is modulated by the holographic optical element (201) to form stray light, which interferes with the human eye's observation of the real scene and the virtual image. The first holographic optical element (201a) in the multiplexing type holographic optical element (201) reflects the direct light of the sunlight and most of the light in the ultraviolet band of the stray light, so as to protect the human eye from damage by ultraviolet rays. The second holographic optical element (201b) in the multiplexed holographic optical element (201) guides light of other wavelength bands to the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b); the first photoelectric conversion module (301a) and the second photoelectric conversion module (301b) convert the collected light into electrical energy and store it in the battery (302); and the battery (302) supplies power to the image source (101).
[0053] Specifically, the phase of the first holographic optical element (201a) is optimized to reflect ultraviolet light in a widest possible angle range, and the phase of the second holographic optical element (201b) is optimized to guide light in a widest possible spectral range and a widest possible angle range to the photoelectric conversion module (301).
[0054] The embodiment of the present application is a multifunctional holographic multiplexing glasses system that can protect against ultraviolet rays. The system includes: a near-eye display module, an ultraviolet protection module, and an external light collection module. The near-eye display module includes an image source and a holographic light guide module. The ultraviolet protection module is a multiplexed holographic optical element attached to the surface of the glasses. The external light collection module includes a photoelectric conversion module and a battery. While realizing near-eye display, the system and method reduce the damage of external ultraviolet light to the human eye, and at the same time alleviate many problems in the power management of the near-eye display system, thereby enhancing the practicality of the near-eye display system.
[0055] To achieve the above objectives, the present application proposes a holographic multiplexing method for multifunctional holographic multiplexing glasses that can protect against ultraviolet rays.
[0056] Figure 6 This is a flow chart of a holographic multiplexing method for UV-proof multifunctional holographic multiplexing glasses according to an embodiment of the present application.
[0057] like Figure 6 As shown, the holographic multiplexing method of the multifunctional holographic multiplexing glasses capable of preventing ultraviolet rays comprises the following steps:
[0058] S1: The image source (101) generates a target image, and the holographic light guide module (102) guides the light of the target image to the human eye.
[0059] S2 The ultraviolet protection module (200) reflects most of the ultraviolet band components in the external light away from the human eye.
[0060] S3: The ultraviolet protection module (200) guides light of other wavelength bands to a specific position.
[0061] S4 The photoelectric conversion module (300) converts the light collected by the holographic optical element into electrical energy and stores it in a battery.
[0062] It should be understood that the implementation principle of the holographic multiplexing method of the UV-proof multifunctional holographic multiplexing glasses of the present application is consistent with the principle of the UV-proof multifunctional holographic multiplexing glasses system of the previous embodiment, and will not be repeated here.
[0063] The embodiment of the present application provides a holographic multiplexing method for multifunctional holographic multiplexing glasses that can protect against ultraviolet rays. The holographic light guide module guides the image source to the human eye to provide virtual information to the human eye. The ultraviolet protection module reflects most of the ultraviolet band components in the external light away from the human eye, and guides light in other bands to a specific location. The external light collection module converts the light collected by the holographic optical element into electrical energy and stores it in a battery. While achieving near-eye display, the system and method reduce the damage of external ultraviolet light to the human eye, and at the same time alleviate many problems in the power management of the near-eye display system, thereby enhancing the practicality of the near-eye display system.
[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0065] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. In the absence of mutual contradictions, the present invention may have various changes and variations for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A multifunctional holographic multiplexed glasses system that can protect against ultraviolet rays, characterized in that: include: A near-eye display module (100), an ultraviolet protection module (200) and an external light collection module (300). The near-eye display module (100) comprises an image source (101) and a holographic light guide module (102), wherein the holographic light guide module (102) comprises a holographic optical element (103) and a first light guide element (104). The holographic light guide module (102) guides the image source (101) to a human eye (105) to provide virtual information to the human eye. The ultraviolet protection module (200) comprises a multiplexed holographic optical element (201) and a second light guide element (202) attached to the surface of the glasses. The ultraviolet protection module (200) reflects most of the ultraviolet band components in the external light away from the human eye, and guides light of other bands to a specific position. The external light collection module (300) comprises a photoelectric conversion module (301) and a battery (302). The photoelectric conversion module (301) converts the light collected by the holographic optical element (201) into electrical energy and stores it in the battery.
2. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: The image source (101) is any one of an LCD display, an LED display, a CRT display, an OLED display, a mini-LED display, a micro-LED display, a micro-OLED display, a plasma display, a field-induced display, a light-emitting polymer display, a projector, and a projection component.
3. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: The holographic light guide module (102) is attached to the eyeglass lens and is a holographic optical element (103) or a combination of a holographic optical element (103) and a first light guide element (104). When it is a holographic optical element (103), the holographic optical element receives the target image light generated by the image source (101), and deflects the target image light to the human eye. When the holographic optical element (103) and the first light guide element (104) are combined, the holographic optical element (103) receives the target image light generated by the image source (101) and diffracts the target image light into the light guide element.
4. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: The light guiding element is any one of a planar waveguide, a cylindrical waveguide or a free-form waveguide.
5. The multifunctional holographic multiplexed glasses system capable of preventing ultraviolet rays as claimed in claim 1, characterized in that: The holographic optical elements in the holographic light guide module (102) and the ultraviolet protection module (200) realize function multiplexing by means of single-layer wavefront multiplexing, single-layer wavelength multiplexing, single-layer angle multiplexing or multi-layer spatial stacking.
6. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: When the holographic optical elements in the holographic light guide module (102) and the ultraviolet protection module (200) are stacked in multiple layers to achieve functional multiplexing, the holographic optical elements in the holographic light guide module (102) and the ultraviolet protection module (200) can be located on the same side or on different sides of the glasses.
7. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: The multiplexed holographic optical element (201) in the ultraviolet protection module (200) is attached to the eyeglass lens and is a multiplexed holographic optical element or a combination of the multiplexed holographic optical element (201) and the second light guide element (202). When it is a multiplexed holographic optical element (201), the multiplexed holographic optical element (201) reflects most of the ultraviolet band components in the external light away from the human eye, and guides light in other bands to a specific position. When the multiplexed holographic optical element (201) and the second light guide element (202) are combined, the multiplexed holographic optical element (201) reflects most of the ultraviolet band components in the external light away from the human eye, and diffracts light in other bands into the second light guide element (202).
8. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: The multiplexed holographic optical element (201) in the ultraviolet protection module (200) realizes function multiplexing by means of single-layer wavefront multiplexing, single-layer wavelength multiplexing, single-layer angle multiplexing, single-layer space partition multiplexing or multi-layer space stacking.
9. The UV-proof multifunctional holographic multiplexed glasses system according to claim 1, characterized in that: When the holographic light guide module (102) and the ultraviolet protection module (200) both use light guide elements, the two can share the same light guide element or use different light guide elements respectively.
10. A holographic multiplexing method for a multifunctional holographic multiplexing glasses system capable of preventing ultraviolet rays, characterized in that: The following steps are involved: S1: The image source (101) generates a target image, and the holographic light guide module (102) guides the light of the target image to the human eye. S2 The ultraviolet protection module (200) reflects most of the ultraviolet band components in the external light away from the human eye. S3: The ultraviolet protection module (200) guides light of other wavelength bands to a specific position. S4 The photoelectric conversion module (300) converts the light collected by the holographic optical element into electrical energy and stores it in a battery.