Augmented reality display optics, optical systems, glasses, and HUD display systems

Abstract

This application provides an augmented reality display optical device, which includes a substrate layer and a micro / nano optical reflective layer. The substrate layer includes a first surface and a second surface opposite to the first surface. The substrate layer transmits ambient light. The micro / nano optical reflective layer is disposed on the first surface of the substrate layer and is configured to reflect light from a virtual image within a predetermined narrow wavelength band. This application also provides an augmented reality display system, augmented reality glasses, and an augmented reality HUD display system incorporating this optical device. This augmented reality display optical device utilizes the characteristics of the micro / nano optical reflective layer—high reflectivity for image light at a predetermined narrow wavelength and high transmittance for ambient light—to achieve high brightness and high transmittance of light sources at a predetermined narrow wavelength in the display system with low cost and low power consumption.

Description

Technical Field

[0001] This application relates to the field of augmented reality display technology, and more specifically, to an augmented reality display optical device, optical system, glasses, and HUD display system. Background Technology

[0002] Augmented reality (AR) technology is a new technology that seamlessly integrates real-world and virtual-world information. It uses computer technology to simulate and overlay information that is difficult to experience in a specific time and space in the real world, applying virtual information to the real world and making it perceptible to human senses. This achieves a sensory experience that transcends reality, with the real environment and virtual objects simultaneously superimposed on the same screen or space. This technology not only displays real-world information but also simultaneously displays virtual information, with the two types of information complementing and overlapping each other. Existing AR systems typically consist of an optical engine and an optical combiner. The optical combiner reflects the image from the optical engine into the human eye while maintaining a certain transmittance of ambient light. Current AR systems cannot achieve high performance in image reflection and ambient light transmission at low cost, which prevents them from achieving high image brightness. Summary of the Invention

[0003] The purpose of this application is to provide an augmented reality display optical device, optical system, glasses, and HUD display system to improve the aforementioned problems. This application achieves the above objective through the following technical solutions.

[0004] In a first aspect, this application provides an augmented reality display optical device, which includes a substrate layer and a micro-nano optical reflective layer. The substrate layer includes a first surface and a second surface opposite to the first surface. The substrate layer transmits ambient light. The micro-nano optical reflective layer is disposed on the first surface of the substrate layer and is configured to reflect light from a virtual image in a predetermined narrow band wavelength range.

[0005] In one embodiment, the micro / nano optical reflective layer includes an intermediate layer and a nano grating layer, wherein the intermediate layer is disposed on a first surface of the substrate layer and the nano grating layer is disposed on the side of the intermediate layer away from the first surface.

[0006] In one embodiment, the nanograting layer is composed of multiple micro-nano grating structures arranged in an array, each of which has a refractive index greater than 1.6.

[0007] In one embodiment, the grating period of the nanograting layer is 200nm to 400nm.

[0008] In one embodiment, the duty cycle of the nanograting layer is 0.1 to 0.9.

[0009] In one embodiment, the nanograting layer is prepared by forming a nanograting layer on an intermediate layer using resin as a raw material through an imprinting process.

[0010] In one implementation, the refractive index of the intermediate layer is greater than 1.6.

[0011] Secondly, this application provides an augmented reality display system, which includes an image projection device and the augmented reality display optics as described above; the image projection device is used to emit image light in a predetermined narrow band wavelength range to the augmented reality display optics; the augmented reality display optics is used to transmit ambient light; the augmented reality display optics is also used to reflect the image light in the predetermined narrow band wavelength range for imaging.

[0012] Thirdly, this application provides augmented reality display glasses, which include a frame, lenses, and an augmented reality display system. The frame includes a lens frame and temple supports connected to each other. The lenses are disposed in the lens frame, and the image projection device is disposed in the temple supports. The augmented reality display optics are attached to the inner surface of the lenses, or the lenses serve as the base layer of the augmented reality display optics.

[0013] Fourthly, this application provides an augmented reality HUD display system, including a windshield and an augmented reality display system, characterized in that the augmented reality display optics are attached to the inner surface of the windshield, or the windshield serves as the substrate layer of the augmented reality display optics.

[0014] Fifthly, this application provides an augmented reality HUD display system, including a standalone HUD screen and an augmented reality display system, characterized in that the augmented reality display optics are attached to the inner surface of the standalone HUD screen, or the standalone HUD screen serves as the substrate layer for the augmented reality display optics.

[0015] Compared to existing technologies, the augmented reality display optical devices, optical systems, glasses, and HUD display systems provided in this application utilize the characteristics of micro-nano optical reflective layers that have extremely high reflectivity for image light at a predetermined narrow wavelength and extremely high transmittance for ambient light, thereby achieving high brightness and high transmittance of image light at a predetermined narrow wavelength in the display system with low cost and low power consumption.

[0016] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the augmented reality display optical device provided in the first embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the reflectivity and refractive index of the augmented reality display optical device provided in the first embodiment of this application, obtained through experimental measurement.

[0020] Figure 3 This is a schematic diagram of one embodiment of the micro / nano optical reflective layer in the augmented reality display optical device provided in the first embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of an augmented reality display system provided in the second embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the structure of an augmented reality display glasses from a first-view perspective, provided in the third embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the structure of augmented reality display glasses from a second perspective, provided in the third embodiment of this application.

[0024] Figure 7 This is a schematic diagram of the structure of an augmented reality HUD display system provided in the fourth embodiment of this application from a first-view perspective.

[0025] Figure 8 This is a schematic diagram of the structure of an augmented reality HUD display system provided in the fourth embodiment of this application from a second perspective.

[0026] Figure 9 This is a schematic diagram of the structure of another augmented reality HUD display system provided in the fifth embodiment of this application from a first-view perspective.

[0027] Figure 10 This is a schematic diagram of the structure of another augmented reality HUD display system provided in the fifth embodiment of this application from a second perspective. Detailed Implementation

[0028] To facilitate understanding of this application, embodiments of this application will be described more fully below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this application. However, embodiments of this application can be implemented in many different forms and are not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the embodiments of this application is for the purpose of describing particular implementations only and is not intended to be limiting of this application.

[0030] In the field of augmented reality display technology, from the perspective of light sources, the main technologies include TFT-LCD / AM-OLED (TFT-LCD: Thin Film Transistor Liquid Crystal Display; AM-OLED: Active Matrix Organic Light Emitting Diode) display screens based on traditional display panels; LED (LED: Light Emitting Diode) / laser light source projection technology based on DLP (Digital Light Processing) and 3LCD (3LCD: decomposes the light emitted by the light source into three colors: R (red), G (green), and B (blue) – the three primary colors of light); LCOS (Liquid Crystal with Silicon) light source technology; and laser scanning schemes based on MEMS (Micro-Electro-Mechanical Systems) systems. From the perspective of optical combiners, the main technologies include Birdbath (curved mirror), freeform surfaces, geometric waveguides (also known as arrayed waveguides), and diffractive waveguide technologies (including surface relief gratings and holographic gratings). Among these, Birdbath, freeform surfaces, and arrayed waveguides are all technologies based on geometric optics. Birdbath and freeform surface technologies achieve optical functionality through directional light reflection and a semi-reflective coating on the surface. These technologies have relatively low production costs and can achieve a wide field of view. However, because such technologies are difficult to implement on thin lenses, products based on these technologies typically lack the lightweight form factor of ordinary eyeglasses. Furthermore, the presence of the semi-reflective coating can affect ambient light to some extent, compromising the user's ability to observe their surroundings. Arrayed waveguide technology uses a multi-layered reflective array coating on the reflective surface of a freeform surface to reduce product size; however, due to its extremely high manufacturing complexity, the cost remains substantial.

[0031] Currently, AR glasses based on diffractive waveguide technology exist on the market. Diffractive waveguide technology is based on micro-nano optics and often employs gratings or holographic gratings with surface relief structures. For surface relief gratings, while traditional rectangular gratings have mature manufacturing processes and good mass production capabilities, they suffer from issues with light efficiency. For holographic gratings, due to material and structural limitations, the achievable refractive index modulation is relatively limited, making them inferior to surface relief gratings in terms of viewing angle, light efficiency, and clarity. Furthermore, their fabrication process is costly and difficult to mass-produce. Additionally, optical combiners based on diffractive optics technology are highly selective for wavelength diffraction angles, easily causing dispersion phenomena and requiring extremely high manufacturing precision, further increasing the cost of this technology. Therefore, AR glasses based on diffractive waveguide technology are relatively expensive. Low-cost, low-power, miniaturized, high-brightness, and high-transmittance AR products are the main direction of future technological pursuit.

[0032] Therefore, after long-term research, the inventors have provided an augmented reality display optical device, optical system, glasses, and HUD display system based on low power consumption, miniaturization, low cost, high brightness, and high transmittance.

[0033] First Embodiment

[0034] Please see Figure 1 This application provides an augmented reality display optical device 10, which includes a substrate layer 200 and a micro / nano optical reflective layer 100. The substrate layer 200 is capable of transmitting ambient light and includes a first surface 210 and a second surface 220 opposite to the first surface 210. The micro / nano optical reflective layer 100 is disposed on the first surface 210 and is configured to reflect image light in a predetermined narrow band wavelength range. Here, the predetermined narrow band wavelength range refers to a predetermined narrower wavelength range. For example, the predetermined narrow band wavelength range can be a specific monochromatic light wavelength range, which can be any one of the blue light wavelength range (450nm-480nm), the green light wavelength range (500nm-560nm), and the red light wavelength range (605nm-700nm). For example, in this embodiment, the predetermined narrow band wavelength range refers to light with a wavelength in the range of 450nm-480nm.

[0035] The substrate layer 200 is transparent to ambient light and can be attached to other display devices as an adhesive layer. In some embodiments, the substrate layer 200 can be planar or freeform. In this embodiment, the first surface 210 is a freeform surface, and the second surface 220 can be mounted and attached to various display systems, such as lenses for AR glasses, windshields for HUD devices, and stand-alone HUD screens. The substrate layer 200 can also be directly used as all or part of the lenses for AR glasses, windshields for HUD devices, and stand-alone HUD screens.

[0036] The intermediate layer 120 provides a base for the nanograting layer 110. The intermediate layer 120 can be disposed on the first surface 210. In this embodiment, the refractive index of the intermediate layer 120 can be greater than 1.6. With an intermediate layer 120 having a refractive index greater than 1.6, when ambient light is incident from one side of the nanograting layer 110 onto the intermediate layer 120, the ambient light from air (refractive index 1.0, optically less dense medium) incident onto the intermediate layer 120 (refractive index 1.6, optically denser medium) will not undergo total internal reflection regardless of the angle of incidence. This ensures that ambient light incident from one side of the nanograting layer 110 onto the micro / nano optical reflective layer 100 will not be reflected, thereby improving the imaging effect. Furthermore, ambient light incident from the substrate layer 200 onto the micro / nano optical reflective layer 100 (with the same principle as air incident onto the intermediate layer 120) will not undergo total internal reflection, thereby improving the transmittance of ambient light.

[0037] The micro / nano optical reflective layer 100 exhibits extremely high reflectivity for image light within a predetermined narrow band wavelength range. In one embodiment, the micro / nano optical reflective layer 100 includes an intermediate layer 120 and a nanograting layer 110. The intermediate layer 120 is disposed on the first surface 210 of the substrate layer 200, and the nanograting layer 110 is disposed on the surface of the intermediate layer 120 away from the first surface 210. The micro / nano optical reflective layer 100 can accept image light emitted from external devices (e.g., laser display optical engines) and reflect the image light, and also possesses a certain magnification imaging function, reflecting the image light and allowing it to enter the rear optical system.

[0038] Nanogratings exhibit extremely high reflectivity for narrow-band wavelengths and extremely high transmittance for other wavelengths, enabling selective wavelength imaging by achieving high reflectivity for image light while maintaining high transmittance for ambient light in other wavelength bands. In some embodiments, the nanograting layer 110 can be composed of multiple micro / nanograting structures arranged in an array, with gaps between each nanograting. This allows ambient light entering the nanograting layer 110 from the intermediate layer 120 to pass through these gaps and reach the human eye or a rear image receiving device. When image light is incident on the nanograting layer 110 from the side away from the intermediate layer 120, each nanograting reflects a local portion of the image light. All these local image lights are combined to form the complete image light, which then enters the human eye or a rear image receiving device, allowing the human eye or rear image receiving device to receive both the complete image light and the ambient light.

[0039] In some embodiments, the refractive index of each micro / nano grating structure can be greater than or equal to 1.6, and can be the same as or approximately equal to the refractive index of the intermediate layer, so that ambient light from the intermediate layer 120 to the nano grating layer 110 will not be reflected, but can pass directly through the nano grating layer 110. At the same time, the refractive index of the micro / nano grating structure is greater than the refractive index of air, so when image light is incident on the micro / nano grating structure, diffraction occurs, and the diffracted light can undergo total internal reflection.

[0040] In some embodiments, the grating period of the nanograting layer 110 can be selected from 200 nm to 400 nm. The grating period refers to the length from one point of refractive index change to the next adjacent point of refractive index change. This gives the nanograting layer 110 extremely high reflectivity for a specific monochromatic light wavelength and extremely high transmittance for ambient light.

[0041] In some embodiments, the duty cycle of the nanograting layer 110 can be 0.1 to 0.9. Adjusting the duty cycle to 0.1 to 0.9 can, on the one hand, improve the reflectivity of image light at a predetermined narrow band wavelength, and on the other hand, adjust the distribution position of each nanograting in the intermediate layer 120 to improve the transmittance of ambient light. In some embodiments, the grating height can be selected from the range of 10 nm to 500 nm. By adjusting the height of the nanograting layer 110, the imaging distance of each nanograting can be adjusted to ensure the imaging effect of image light within a certain range.

[0042] The refractive index of the nanograting layer 110 was adjusted to be greater than 1.6, the period was selected to be 200–400 nm, the duty cycle to be 0.1–0.9, and the height to be 10 nm–500 nm. Experimental measurements showed that… Figure 2As shown in the figure, the horizontal axis represents the wavelength of light, and the vertical axis represents the transmittance / reflectance. The nanograting layer 110 with this structure (refractive index greater than 1.6, period 200nm~400nm, duty cycle 0.1~0.9, height 10nm~500nm) achieves a reflectance of over 60% at specific wavelengths (such as blue aurora 455nm, green laser 525nm, and red laser 632nm). In particular, it achieves extremely high reflectance at the wavelength of 525nm, approximately 97%, while ensuring a half-maximum width of less than 15nm, and also has good transmittance to ambient light and ensures an extremely narrow bandwidth (5nm).

[0043] The nanograting layer 110 includes a plurality of nanogratings arranged in an array, such as a rectangular array, to form the nanograting layer 110. In some embodiments, please refer to... Figure 3 The nanograting layers 110 can be arranged in a rectangular array in mutually perpendicular rows and columns. In this way, the magnified image light formed by each nanograting layer 110 can be stitched together to form a complete image without overlapping. Therefore, the spacing between the nanograting layers 110 in each row can be equal, and the spacing between the nanograting layers 110 in each column can also be equal.

[0044] Besides a rectangular array arrangement, the nanograting layer 110 can also be arranged in other ways. For example, the nanogratings can also be arranged in a ring array to form the nanograting layer 110. With proper arrangement, the spacing between each nanograting is the same, thus forming a complete image light.

[0045] In some embodiments, the nanograting layer 110 can be formed on the intermediate layer 120 using resin as a raw material through imprinting. Resin is inexpensive, lightweight, and has good light transmittance, ensuring excellent transmittance to ambient light. Imprinting, i.e., superimposing nanogratings on the intermediate layer 120 to form the nanograting layer 110, ensures that the spacing between the nanogratings is within a predetermined range. This improves the nanograting layer 110's extremely high reflectivity to a predetermined narrowband image light while maintaining excellent transmittance to ambient light. Furthermore, the imprinting process is simple, easy to mass-produce, and thus reduces costs.

[0046] In summary, the augmented reality display optical device 10 provided in this application utilizes a nanograting layer 110, which is arranged in an array on an intermediate layer 120 so that the image light reflected by each nanograting can be stitched together to form a complete image. The refractive index of the nanograting layer 110 is set to be greater than 1.6 to achieve high reflectivity for image light at a predetermined narrow wavelength; the period is selected to be 200nm to 400nm, achieving extremely high reflectivity for image light while maintaining extremely high transmittance for ambient light; and it is fabricated using a hot-pressing method, achieving low cost.

[0047] Second Embodiment

[0048] Please see Figure 4 This application also provides an augmented reality display system 20, which includes an image projection device 300 and the augmented reality display optics 10 from the first embodiment. The image projection device 300 emits image light of a predetermined narrow wavelength band to the augmented reality display optics 10. The augmented reality display optics 10 transmits ambient light and reflects the image light at the predetermined narrow wavelength band to form an image. The image projection device 300 may be a laser display optical engine, and the image light emitted by the laser display optical engine may be a three-primary-color laser image to achieve extremely high reflectivity and improve imaging effect.

[0049] For clarity, please refer to the following document again. Figure 4 , Figure 4 The solid line represents the optical path of the image light, and the dashed line represents the optical path of the ambient light. Since the image projection device 300 can be a laser display optical engine, and laser light sources have advantages such as high brightness, small divergence angle, wide color gamut, and high energy efficiency, high luminous brightness can be guaranteed with low power consumption. Furthermore, this display system utilizes the augmented reality display optics 10 from the first embodiment, which has high reflectivity for the image projection device and high transmittance for ambient light, ensuring high-brightness imaging without affecting the user's observation of ambient light.

[0050] Third Embodiment

[0051] Please see Figure 5 This application provides an augmented reality display glasses 30, which includes a frame 500, lenses 400, and an augmented reality display system 20 as described in the second embodiment. The frame 500 includes a frame 520 and temple supports 510 connected to each other. The lenses 400 are disposed in the frame 520, and an image projection device 300 is disposed in the temple supports 510. The augmented reality display optics 10 are attached to the inner surface of the lenses 400.

[0052] Please refer to the following: Figure 5 and Figure 6 The frame 500 provides a mounting base for the lens 400 and the augmented reality display system 10b. In some embodiments, the frame 500 includes interconnected lens frames 520 and temple supports 510. The lens frame 520 may be an annular structure, and there may be two lens frames 520 connected to each other. The interior of the annular lens frame 520 is used to mount the lens 400. The temple supports 510 are rotatably mounted on the lens frame 510. Similarly, there may be two temple supports 510, each mounted on one of the two lens frames 520.

[0053] Please refer to it again. Figure 5 In some embodiments, the lens 400 and the frame 520 may have the same external shape to facilitate the fitting and installation of the lens 400 and the frame 520. Similarly, there may be two lenses 400, each disposed in one of two frames 520. The lens 400 may be an optical device with a curved surface structure made of optical materials such as glass or resin, exhibiting excellent transmittance to ambient light.

[0054] Specifically, the augmented reality display optics 10 is attached to the inner surface of the lens 400, that is, the surface of the lens 400 facing the temple support 510. In one embodiment, the surface of the substrate layer 200 of the augmented reality display optics 10 that is away from the micro / nano optical reflective layer 100 is attached to the inner surface of the lens 400.

[0055] In some embodiments, the substrate 200 of the augmented reality display optics 10 can also be directly used as a lens 400 and directly mounted on the lens frame 520. Alternatively, the substrate 200 can be embedded in the lens 400 as only a part of the lens 400.

[0056] Similarly, to improve the display effect of the augmented reality glasses 30, the augmented reality display system 20 can also include two systems. The augmented reality display optics 10 of the two systems are respectively mounted on two lenses 400, and the two image projection devices 300 are respectively mounted on two frame supports 510. By reasonably adjusting the projection angle of the image projection devices 300, the augmented reality display optics 10 are positioned in the optical path of the image light, and the image light is completely projected onto the augmented reality display optics 10.

[0057] In some other embodiments, the image projection device 300 may also be disposed in the frame 520, such that the augmented reality display optics 10 is located in the optical path of the image light, and the augmented reality optics 10a has extremely high reflectivity to the image light.

[0058] Fourth embodiment

[0059] Please refer to the following: Figure 7 and Figure 8 This application also provides an augmented reality HUD display system 40, which includes a windshield 500 and the augmented reality display system 20 in the second embodiment.

[0060] The windshield 500 can be a car windshield, or it can be the windshield of other equipment or buildings. The augmented reality display optics 10 is attached to the inner surface of the windshield 500. The image projection device 300 in the augmented reality display system 20 can be installed on the A-pillar inside the vehicle or on other components where the image projection device 300 can be installed, and the micro-nano optical reflective layer 100 is located in the optical path of the image projection device 300.

[0061] In some implementations, such as Figure 7 As shown, the augmented reality display optics 10 can be attached to only a portion of the windshield 500, or it can be attached to the entire windshield 500. Specifically, the augmented reality display optics 10 is attached to the inner surface of the windshield 500. It is understood that the inner surface of the windshield 500 refers to the side of the windshield 500 located inside the vehicle (using a car as an example; similar implementations exist in other devices). As one implementation, the surface of the substrate layer 200 of the augmented reality display optics 10 that is furthest from the micro / nano optical reflective layer 100 is attached to the inner surface of the windshield 400.

[0062] In some embodiments, the substrate layer 200 of the augmented reality display optics 10 can also be directly used as the windshield 500, directly mounted on the frame of the windshield 500 or other equipment mounting frame. Alternatively, the substrate layer 200 can be embedded within the windshield 500 as only a part of it. In some embodiments, the image projection device 300 is disposed on one side of the inner surface of the windshield 400, specifically, for example, on the A-pillar of a car or other fixed devices, provided that the augmented reality display optics 10 is located in the optical path of the image light emitted by the image projection device 300.

[0063] Fifth embodiment

[0064] Please refer to the following: Figure 9 and Figure 10 This application also provides an augmented reality HUD display system 50, which includes an independent HUD screen 600 and an augmented reality display system 20 in the second embodiment, with augmented reality display optics 10 attached to the inner surface of the independent HUD screen 600.

[0065] The standalone HUD screen 600 can be configured to be portable and can be attached to the glass of a car or other vehicle using adhesive or other methods, serving as a display screen. For example, the standalone HUD screen 600 can be attached to the inner surface of the car's windshield, roughly in front of the steering wheel, serving as a head-up display for the driver and passengers.

[0066] Specifically, the augmented reality display optics 10 is attached to the inner surface of the standalone HUD screen, that is, located on the side of the standalone HUD screen closer to the rear optical system (in the automotive field, it is located on the side of the standalone HUD screen closer to the driver and passengers). As one embodiment, the surface of the substrate layer 200 of the augmented reality display optics 10 that is away from the micro / nano optical reflective layer 100 is attached to the inner surface of the standalone HUD screen 600.

[0067] In some embodiments, the substrate 200 of the augmented reality display optics 10 can also be directly used as a standalone HUD screen 600. Alternatively, the substrate 200 can be embedded within the standalone HUD screen 600 as only a part of it. In some embodiments, the image projection device 300 is disposed on one side of the inner surface of the standalone HUD screen. Specifically, for example, it can be disposed on the A-pillar of a car or other fixed devices, provided that the augmented reality display optics 10 is located in the optical path of the image light emitted by the image projection device 300.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An augmented reality display optical device, characterized in that, include: A substrate layer, the substrate layer including a first surface and a second surface opposite to the first surface, the substrate layer transmitting ambient light; as well as A micro / nano optical reflective layer includes an intermediate layer and a nano grating layer. The intermediate layer is disposed on a first surface of a substrate layer, and the nano grating layer is disposed on the side of the intermediate layer away from the first surface. The nano grating layer is composed of multiple micro / nano grating structures arranged in an array. The duty cycle of the nano grating layer is 0.1 to 0.

9. The refractive index of each micro / nano grating structure is the same as that of the intermediate layer. The micro / nano optical reflective layer is configured to reflect image light in a predetermined narrow band wavelength range. The refractive index of each micro / nano grating structure is greater than 1.

6. The grating period of the nano grating layer is 200 nm to 400 nm.

2. The augmented reality display optical device according to claim 1, characterized in that, The nanograting layer is prepared by means of resin as raw material and forming the nanograting layer on the intermediate layer by imprinting.

3. An augmented reality display system, characterized in that, include: Image projection device and augmented reality display optics as described in any one of claims 1-2; The image projection device is used to emit image light in a predetermined narrow band wavelength range to the augmented reality display optics; The augmented reality display optics are used to transmit ambient light; The augmented reality display optics are also used to reflect image light in the predetermined narrow band wavelength range for imaging.

4. An augmented reality display glasses, comprising a frame, lenses, and an augmented reality display system as described in claim 3, characterized in that, The eyeglass frame includes an interconnected frame and temple supports; the lens is disposed in the frame; the image projection device is disposed in the temple supports; and the augmented reality display optics are attached to the inner surface of the lens. Alternatively, the lens may serve as the base layer of the augmented reality display optics.

5. An augmented reality display HUD system, comprising a windshield and the augmented reality display system as described in claim 3, characterized in that, The augmented reality display optics are attached to the inner surface of the windshield; Alternatively, the windshield can serve as the base layer for the augmented reality display optics.

6. An augmented reality display HUD system, comprising a stand-alone HUD screen and the augmented reality display system as described in claim 3, characterized in that, The augmented reality display optics are attached to the inner surface of the independent HUD screen; Alternatively, the standalone HUD screen can serve as the base layer for the augmented reality display optics.

Images