Augmented reality device

Abstract

The utility model provides an augmented reality device. The augmented reality device comprises an optical machine which comprises a light source and a second filtering layer arranged on the light emitting side of the light source; the AR lens is located on the light emitting side of the light machine, a first filtering layer is arranged on the AR lens, the reflection spectrum bandwidth of the first filtering layer is the same as or different from the transmission spectrum bandwidth of the second filtering layer, and the reflectivity of the first filtering layer to part of the spectrum of the light source is larger than or equal to 50%. According to the utility model, the problem of light leakage of augmented reality equipment in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging, and in particular to an augmented reality device. Background Art

[0002] Augmented Reality (AR) technology refers to the process of superimposing computer-generated virtual images onto real-world scenes, thereby enhancing the real world and achieving a display effect that combines virtual and real things. In other words, AR technology requires the collection of real-world scenes and then adding virtual environments to the real world. Light is the medium for information transmission. Penetrating augmented reality devices include holographic gratings, reflective waveguides, ordinary reflective prisms, and free-form surface prisms. Taking AR glasses as an example, users can see the real world through the optical display of AR glasses while also receiving virtual information. However, the solutions currently used in AR glasses generally have the problem of forward light leakage, which allows people other than the wearer to see what the AR glasses display through the lenses of the AR glasses. This light leakage problem leads to serious information leakage, destroys the privacy of the wearer, and limits the use scenarios of AR glasses.

[0003] That is to say, the augmented reality devices in the prior art have the problem of light leakage. Utility Model Content

[0004] The main purpose of the utility model is to provide an augmented reality device to solve the light leakage problem of the augmented reality device in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an augmented reality device, including: an optical machine, the optical machine includes a light source and a second filter layer arranged on the light output side of the light source; an AR lens, the AR lens is located on the light output side of the optical machine, and a first filter layer is arranged on the AR lens, the reflection spectrum bandwidth of the first filter layer is the same as or different from the transmission spectrum bandwidth of the second filter layer, and the reflectivity of the first filter layer to a part of the spectrum of the light source is greater than or equal to 50%.

[0006] Furthermore, the light source is an LED light source, and the spectral bandwidth of the LED light source at least includes a first red light bandwidth, a first blue light bandwidth, and a first green light bandwidth.

[0007] Furthermore, the total width of the reflection spectrum bandwidth of the first filter layer is less than or equal to 80 nm.

[0008] Furthermore, the second filter layer transmits light of a first preset spectral bandwidth, and a transmittance of the second filter layer to light of the first preset spectral bandwidth is greater than or equal to 50% and less than or equal to 100%.

[0009] Furthermore, the second filter layer totally reflects or absorbs light rays other than the light rays within the first preset spectral bandwidth.

[0010] Furthermore, the first filter layer reflects light of a second preset spectral bandwidth, the second preset spectral bandwidth is different from the spectral bandwidth of the light source, the second preset spectral bandwidth includes at least a second red light bandwidth, a second blue light bandwidth and a second green light bandwidth, and a width of one of the second red light bandwidth, the second blue light bandwidth and the second green light bandwidth is greater than widths of the other two.

[0011] Further, the width of the second red light bandwidth is greater than the width of the second blue light bandwidth, and / or the width of the second red light bandwidth is greater than the width of the second green light bandwidth.

[0012] Furthermore, the first filter layer reflects light of a second preset spectral bandwidth, and a reflectivity of the first filter layer to the light of the second preset spectral bandwidth is greater than or equal to 60% and less than or equal to 100%.

[0013] Further, when the reflection spectrum bandwidth of the first filter layer is different from the transmission spectrum bandwidth of the second filter layer, the reflection spectrum bandwidth of the first filter layer is greater than the transmission spectrum bandwidth of the second filter layer.

[0014] Furthermore, the color temperature of the black body radiation spectrum of 2700K-6500K after passing through the first filter layer changes by less than ±300K, and the luminous flux changes by less than 20%.

[0015] Applying the technical solution of the utility model, an augmented reality device includes an optical machine and an AR lens. The optical machine includes a light source and a second filter layer arranged on the light output side of the light source; the AR lens is located on the light output side of the optical machine, and a first filter layer is arranged on the AR lens. The reflection spectrum bandwidth of the first filter layer is the same as or different from the transmission spectrum bandwidth of the second filter layer, and the reflectivity of the first filter layer to a part of the spectrum of the light source is greater than or equal to 50%.

[0016] By setting the first filter layer and the second filter layer, and planning the reflection spectral bandwidth of the first filter layer to be the same as or different from the transmission spectral bandwidth of the second filter layer, it is beneficial to match the spectral bandwidths of the two with the spectral bandwidth of the light source, thereby reducing light leakage. Since the light enters the human eye for display after being reflected by the AR lens, the reflection spectral bandwidth of the AR lens covers the spectral bandwidth of the light source, and the reflectivity covers the spectral bandwidth range, ensuring that the light emitted by the light source can be fully reflected into the human eye without causing light leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of an augmented reality device according to an optional embodiment of the present utility model is shown;

[0019] Figure 2 A flow chart showing a method for determining a filter layer in an augmented reality device according to an optional embodiment of the utility model is shown;

[0020] Figure 3 Shows Figure 2 A flow chart for determining the reflection spectral bandwidth of the first filter layer on the AR lens;

[0021] Figure 4 Shows Figure 1 Spectral curve of the light source in;

[0022] Figure 5 Shows Figure 1 A transmission spectrum curve of the first filter layer in FIG.

[0023] Figure 6 , Figure 7 , Figure 8 The spectrum change diagrams of 2700K, 4500K and 6500K black body radiation curves after passing through the first filter layer are shown respectively;

[0024] Fig. 9 Shows Figure 1 A transmission spectrum curve of the second filter layer in FIG.

[0025] Fig.10 A diagram showing the spectrum change of the light source in the augmented reality device of the present invention after passing through the second filter layer.

[0026] The above drawings include the following reference numerals:

[0027] 10. Optical machine; 11. Light source; 12. Second filter layer; 13. Imaging optical system; 20. AR lens; 30. First filter layer. DETAILED DESCRIPTION

[0028] 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 utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0031] In order to solve the light leakage problem of augmented reality devices in the prior art, the utility model provides an augmented reality device.

[0032] like Figures 1 to 10 As shown, the method for determining the filter layer in the augmented reality device includes the following steps: determining the reflection spectral bandwidth of the first filter layer 30 on the AR lens 20: adjusting the initial spectral bandwidth, and when the adjusted spectral bandwidth meets the preset transmittance range, determining the current spectral bandwidth as the second spectral bandwidth; determining the transmission spectral bandwidth of the second filter layer 12 in the optical machine 10: determining the transmission spectral bandwidth of the second filter layer 12 according to the second spectral bandwidth.

[0033] In the process of determining the reflection spectrum bandwidth of the first filter layer 30 on the AR lens 20, by adjusting the initial spectrum bandwidth obtained, and calculating and judging the transmittance of the adjusted spectrum bandwidth, when the transmittance meets the preset transmittance range, the current spectrum bandwidth is determined to be the second spectrum bandwidth, so that the second spectrum bandwidth finally obtained is the reflection spectrum bandwidth of the first filter layer 30, thereby obtaining the first filter layer 30 with high reflectivity, increasing the reflectivity is conducive to avoiding the problem of imaging light leakage, avoiding light leakage, ensuring that people other than the wearer cannot see the displayed content on the AR lens 20, thereby avoiding information leakage, ensuring the privacy of the wearer, and expanding the application scenario. First, the reflection spectrum bandwidth of the first filter layer 30 on the AR lens 20 is determined, and then the transmission spectrum bandwidth of the second filter layer 12 in the optical machine 10 is determined according to the reflection spectrum bandwidth, which is conducive to ensuring the matching of the spectrum of the first filter layer 30 and the spectrum of the second filter layer 12, avoiding the situation where the light flux is reduced too much during the light transmission process between the two, and ensuring the stability of the light flux. At the same time, it is helpful to ensure the transmittance of the second filter layer 12 to a specific spectrum and the reflectivity of the first filter layer 30 to a specific spectrum, thereby ensuring the use effect of the first filter layer 30 and the second filter layer 12.

[0034] Specifically, in the above process of determining the reflection spectrum bandwidth of the first filter layer 30 on the AR lens 20, it includes: calculating the actual transmittance of the adjusted spectrum bandwidth according to the luminous flux ratio, and determining the current spectrum bandwidth as the second spectrum bandwidth when the actual transmittance meets the preset transmittance range; wherein the luminous flux ratio is the luminous flux ratio required for the adjusted spectrum bandwidth to match the blackbody radiation curve of the preset color temperature value. The actual transmittance of the adjusted spectrum bandwidth is calculated according to the luminous flux ratio, and such a setting makes the actual transmittance related to the luminous flux ratio required for matching the blackbody radiation curve of the preset color temperature value, and the luminous flux ratio is Φr:Φg:Φb=red light flux:green light flux:blue light flux. In this way, the change of the luminous flux of the blackbody radiation curve passing through the first filter layer 30 can be obtained, and the value of the actual transmittance can be calculated according to the change of the luminous flux.

[0035] It should be noted that the above-mentioned preset transmittance range is a transmittance less than 50%. Preferably, the preset transmittance range is greater than 0 and less than 50%, and more preferably less than or equal to 5%. By reasonably constraining the preset transmittance range, the smaller the transmittance, the higher the reflectivity of the first filter layer 30 for a specific spectral bandwidth, thereby obtaining a spectral bandwidth range with high reflectivity and stable light flux.

[0036] like Figure 3 As shown, in the above process of determining the reflection spectrum bandwidth of the first filter layer 30 on the AR lens 20, it includes: according to the type of light source 11 in the optical machine 10, the initial spectrum bandwidth is selected and determined, and the initial spectrum bandwidth at least includes red light bandwidth, blue light bandwidth and green light bandwidth, that is, the initial spectrum bandwidth is RGB bandwidth. In actual application, the initial spectrum bandwidth can select 50% of the full bandwidth, that is, select the bandwidth range with 50% energy. Calculate the luminous flux ratio required for the initial spectrum bandwidth to match the blackbody radiation curve of the preset color temperature value, and adjust the initial spectrum bandwidth according to the luminous flux ratio of the initial spectrum bandwidth, that is, according to Φr:Φg:Φb of the initial spectrum bandwidth, adjust the range of at least one of the red light bandwidth, the blue light bandwidth and the green light bandwidth, and the adjustment includes expanding the bandwidth range or reducing the bandwidth range. After the adjustment, the adjusted spectrum bandwidth is obtained, and then the actual transmittance of the adjusted spectrum bandwidth is calculated according to the luminous flux ratio.

[0037] Specifically, the actual transmittance of the adjusted spectral bandwidth is calculated according to the luminous flux ratio, including: calculating the total luminous flux according to the luminous flux ratio, the total luminous flux Φ being equal to the sum of Φr, Φg and Φb of the adjusted spectral bandwidth. Then, according to the ratio of the total luminous flux to the actual luminous flux, the actual transmittance of the adjusted spectral bandwidth is obtained. According to the ratio of the total luminous flux to the actual luminous flux = total luminous flux Φ / actual luminous flux Φ 原 , actual luminous flux Φ 原is the original luminous flux, that is, the sum of Φr, Φg and Φb of the AR lens 20 without the first filter layer 30. Total luminous flux Φ / actual luminous flux Φ 原 The actual transmittance can be obtained, and then the adjusted spectral bandwidth can be judged according to the actual transmittance to determine whether it meets the preset transmittance.

[0038] It should be noted that the luminous flux of at least one color among Φr, Φg and Φb of the adjusted spectral bandwidth is 100%.

[0039] Specifically, in the process of adjusting the initial spectral bandwidth in the above-mentioned determination of the reflection spectral bandwidth of the first filter layer 30 on the AR lens 20, the green light bandwidth and the blue light bandwidth of the initial spectral bandwidth are adjusted. In the adjustment process, it is necessary to ensure that the ratio of the luminous flux of the green light bandwidth to the luminous flux of the blue light bandwidth after adjustment is equal to or close to the ratio of the luminous flux of the green light bandwidth to the luminous flux of the blue light bandwidth of the AR lens 20 without the first filter layer 30. This is conducive to avoiding polarization and ensuring the stability of the ratio of different diffraction bandwidths.

[0040] Furthermore, in the process of adjusting the range of the green light bandwidth and the blue light bandwidth of the initial spectrum bandwidth, the total width of the red light bandwidth, the blue light bandwidth and the green light bandwidth is made less than or equal to 80nm. In other words, the sum of the band width of the red light bandwidth, the band width of the blue light bandwidth and the band width of the green light bandwidth is less than or equal to 80nm. By reasonably compressing the total width, it is beneficial for the first filter layer 30 to match the second spectrum bandwidth to be able to directionally reflect the light of the band, and to ensure that the reflectivity is above 95%.

[0041] Of course, in the process of adjusting the range of the green light bandwidth and the blue light bandwidth of the initial spectral bandwidth, the red light bandwidth can also be adjusted to adjust the red light bandwidth with the largest luminous flux proportion to the maximum, so that after adjustment, the width of the red light spectral bandwidth is greater than the width of the blue light spectral bandwidth, and the width of the red light spectral bandwidth is greater than the width of the green light spectral bandwidth.

[0042] In the above determination of the reflective spectral bandwidth of the first filter layer 30 on the AR lens 20, it includes: judging whether the actual transmittance is less than 50%. When the actual transmittance of the adjusted spectral bandwidth does not meet the preset transmittance range, the current spectral bandwidth is adjusted again, and the transmittance of the re-adjusted spectral bandwidth is calculated. The transmittance calculation process is the same as the above-mentioned "calculating the actual transmittance of the adjusted spectral bandwidth according to the luminous flux ratio", which will not be repeated here. Until the adjusted spectral bandwidth meets the preset transmittance range, the spectral bandwidth is used as the second spectral bandwidth, and the process ends. In other words, the process of adjusting the range of the spectral bandwidth is not limited to once, and each adjustment is based on the luminous flux ratio (red light flux: green light flux: blue light flux) required for the spectral bandwidth adjusted in the previous time to match the blackbody radiation curve of the preset color temperature value.

[0043] Specifically, after obtaining the second spectral bandwidth of the first filter layer 30, in the above-mentioned determination of the transmission spectral bandwidth of the second filter layer 12 in the optical machine 10, it includes: selecting the transmission spectral bandwidth of the second filter layer 12 so that the transmission spectral bandwidth is the same as or less than the second spectral bandwidth. The transmission spectral bandwidth is the second spectral bandwidth, that is, the transmission spectral bandwidth of the second filter layer 12 is closely related to the second spectral bandwidth. The transmission spectral bandwidth of the second filter layer 12 can be set to be the same as the second spectral bandwidth, or the transmission spectral bandwidth of the second filter layer 12 can be set to be within the second spectral bandwidth. It can be set according to actual needs. Such a setting can reduce light leakage. Since the light enters the human eye through the reflection of the AR lens 20 for display, by making the reflection spectral bandwidth of the AR lens 20 cover the spectral bandwidth of the light source 11, the reflectivity covers the spectral bandwidth range, ensuring that the light emitted by the light source 11 can be fully reflected into the human eye without light leakage.

[0044] Specifically, the light transmittance of the second filter layer 12 in the transmission spectrum bandwidth is greater than or equal to 50% and less than or equal to 100%, and the second filter layer 12 reflects or absorbs all light outside the transmission spectrum bandwidth. The light reflection of the first filter layer 30 in the second spectrum bandwidth is greater than or equal to 50% and less than or equal to 100%. This arrangement is conducive to avoiding the problem of light leakage.

[0045] Specifically, the preset color temperature value is set to be greater than or equal to 2700K and less than or equal to 6500K, preferably 6500K.

[0046] The following describes the method for determining the filter layer in the augmented reality device of the present application in conjunction with specific embodiments and drawings.

[0047] In the process of determining the reflection spectrum bandwidth of the first filter layer 30 on the AR lens 20, taking the light source 11 in the optical machine 10 as an RGB light source as an example, Figure 4The R light spectrum curve, G light spectrum curve and B light spectrum curve of the RGB light source are shown, so the initial spectrum bandwidth is determined to be the red light bandwidth Wr (570nm-695nm), the blue light bandwidth Wb (410nm-510nm) and the green light bandwidth Wg (450nm-620nm), and then the initial spectrum bandwidth is adjusted according to the luminous flux ratio required for the blackbody radiation curve of the preset color temperature value to match the initial spectrum bandwidth, and then the luminous flux ratio required for the blackbody radiation curve of the preset color temperature value to match the adjusted spectrum bandwidth Example: Calculate the actual transmittance of the adjusted spectral bandwidth, so that the color temperature change of the black body radiation curve of 2700K-6500K after passing through the first filter layer 30 is less than ±300K, and the change of the luminous flux decrease is less than 20%, and when the actual transmittance is ≤5%, determine the current spectral bandwidth as the second spectral bandwidth, and finally obtain the second spectral bandwidth as the red light bandwidth WR_r (625nm-653nm), the green light bandwidth WR_g (651nm-639nm) and the blue light bandwidth WR_b (451nm-462nm). Within this bandwidth range, the reflectivity of the first filter layer 30 is ≥95%, and the first filter layer 30 is transmissive for other spectral bandwidths, and the transmittance is ≤5%. Figure 5 The transmission spectrum curve of the first filter layer 30 is shown.

[0048] Figure 6 , Figure 7 and Figure 8 The spectral changes of the 2700K, 4500K and 6500K black body radiation curves after passing through the first filter layer 30 are shown respectively. Table 1 below shows the color temperature changes and color coordinate changes of the 2700K, 4500K and 6500K black body radiation curves after filtering through the first filter layer 30.

[0049] Table 1

[0050]

[0051]

[0052] In this embodiment, in the above-mentioned process of matching the luminous flux ratio required by the blackbody radiation curve of the preset color temperature value according to the initial spectral bandwidth, and in the process of matching the luminous flux ratio required by the blackbody radiation curve of the preset color temperature value according to the adjusted spectral bandwidth, the calculation method of the luminous flux ratio is the same, including calculating the luminous flux ratio of the 6500K blackbody radiation curve color coordinates in the corresponding spectral bandwidth, specifically including: calculating the chromatic coordinates and luminous flux Xr, Yr, Φr; Xg, Yg, Φg; Xb, Yb, Φb of the 6500K blackbody radiation curve under the corresponding spectral bandwidth; XY represents the color coordinates, and Φ represents the luminous flux. (X=0.3135, Y=0.3236) is used as the target color coordinate, and the luminous flux ratio of the corresponding spectrum is calculated by the target color coordinates to obtain the proportional relationship of Φr:Φg:Φb. This method can effectively reduce the color distortion of the picture caused by the external ambient light passing through the first filter layer 30 in front of the AR lens 20.

[0053] Then the total luminous flux Φ=Φr+Φg+Φb is calculated, and then the actual transmittance of the adjusted spectral bandwidth is obtained according to the ratio of the total luminous flux to the actual luminous flux.

[0054] like Figure 1 and Fig.10 As shown, in the process of determining the transmission spectrum bandwidth of the second filter layer 12 according to the second spectrum bandwidth, the transmission spectrum bandwidth of the second filter layer 12 is set to be the same as the second spectrum bandwidth, which is the red light bandwidth WR_r (625nm-653nm), the green light bandwidth WR_g (651nm-639nm) and the blue light bandwidth WR_b (451nm-462nm). Fig. 9 The transmission spectrum curve of the second filter layer 12 is shown. The transmittance of the second filter layer 12 within this bandwidth is greater than or equal to 95%, and the other bands are fully reflected or absorbed. The spectrum of the RGB light source after passing through the second filter layer 12 is shown in FIG. Fig.10 As shown, the second filter layer 12 clips the spectrum of the RGB light source, and when the optical machine 10 performs color mixing calculations on the image, the clipped spectral data R1, G1, and B1 need to be used. Since the transmission spectrum range of the second filter layer 12 is the same as the reflection spectrum range of the first filter layer 30 of the AR lens 20, and the transmittance of the light source 11 and the first filter layer 30 in front of the AR lens 20 are the same in each band spectrum range, the R1G1B1 light reaches the first filter layer 30 of the AR lens 20 and is reflected back, and the energy ratio of the reflected light remains unchanged, so no color difference is generated. When the reflectivity of the reflection band is 100%, complete reflection is performed, and the augmented reality device will not have forward light leakage.

[0055] In summary, the present application further determines the spectral bandwidth of the first filter layer 30 and the second filter layer 12 by setting the first filter layer 30 and the second filter layer 12, which is beneficial to improving the reflectivity of the first filter layer 30 to a specific spectrum and improving the transmittance of the second filter layer 12 to a specific spectrum, which is beneficial to ensuring that the brightness and color are not distorted when the wearer observes the external environment, thereby enhancing the user experience; at the same time, it can eliminate the forward light leakage phenomenon, effectively protect the user's privacy, and increase the use scenarios of the augmented reality device; it can also ensure that the image color of the augmented reality device is not distorted, thereby enhancing the user experience.

[0056] like Figure 1 As shown, the present application also provides an augmented reality device, including an optical machine 10 and an AR lens 20, the optical machine 10 includes a light source 11 and a second filter layer 12 arranged on the light output side of the light source 11; the AR lens 20 is located on the light output side of the optical machine 10, and a first filter layer 30 is arranged on the AR lens 20, the reflection spectrum bandwidth of the first filter layer 30 is the same as or different from the transmission spectrum bandwidth of the second filter layer 12, and the reflectivity of the first filter layer 30 to a part of the spectrum of the light source 11 is greater than or equal to 50%.

[0057] By setting the first filter layer 30 and the second filter layer 12, and planning the reflection spectral bandwidth of the first filter layer 30 to be the same as or different from the transmission spectral bandwidth of the second filter layer 12, it is beneficial to match the spectral bandwidths of the two with the spectral bandwidth of the light source 11, so as to reduce light leakage. Since the light enters the human eye for display after being reflected by the AR lens 20, the reflection spectral bandwidth of the AR lens 20 covers the spectral bandwidth of the light source 11, and the reflectivity covers the spectral bandwidth range, thereby ensuring that the light emitted by the light source 11 can be fully reflected into the human eye without causing light leakage.

[0058] Specifically, the light source 11 is an LED light source, and the spectral bandwidth of the LED light source includes at least a first red light bandwidth, a first blue light bandwidth, and a first green light bandwidth. The present application is applicable to augmented reality devices of LED light sources. The optical machine 10 includes an LCOS optical machine, a DLP optical machine, a micro-LED display optical machine, an OLED display optical machine, etc. The light source 11 includes an ordinary LED, a mocro LED and a mini LED, OLED, etc. The LED light source can be a combination of multiple light sources 11, such as an RGB light source, an RGGB light source, an RGBW light source, or a monochromatic light source, such as an R light source, a G light source, a B light source, etc. The spectral bandwidth of the LED light source is the initial spectral bandwidth in the above method. In a specific embodiment, the first red light bandwidth Wr (570nm-695nm), the first blue light bandwidth Wb (410nm-510nm) and the first green light bandwidth Wg (450nm-620nm).

[0059] Specifically, the first filter layer 30 reflects light of a second preset spectral bandwidth, which is the second spectral bandwidth in the above method. The second preset spectral bandwidth is different from the spectral bandwidth of the light source 11. The second preset spectral bandwidth includes at least a second red light bandwidth, a second blue light bandwidth, and a second green light bandwidth. One of the second red light bandwidth, the second blue light bandwidth, and the second green light bandwidth is greater than the other two. In this embodiment, the width of the second red light bandwidth is greater than the width of the second blue light bandwidth, and the width of the second red light bandwidth is greater than the width of the second green light bandwidth. The second red light bandwidth is WR_r (625nm-653nm), the second green light bandwidth is WR_g (651nm-639nm), and the second blue light bandwidth is WR_b (451nm-462nm). The reflectivity of the first filter layer 30 to the light of the second preset spectral bandwidth is greater than or equal to 60% and less than or equal to 100%. Preferably, the reflectivity is greater than or equal to 95% and less than or equal to 100%.

[0060] In the present application, the total width of the reflection spectrum bandwidth of the first filter layer 30 is less than or equal to 80nm. Specifically, the width of the second red light bandwidth WR_r (625nm-653nm) is 28nm, the width of the second green light bandwidth WR_g (651nm-639nm) is 12nm, and the width of the second blue light bandwidth WR_b (451nm-462nm) is 11nm. The total width is 28nm+12nm+11nm=51nm. This arrangement is conducive to ensuring the light flux ratio, avoiding chromatic aberration, and ensuring that the first filter layer 30 can reflect all the imaging light back. Ensure reflectivity.

[0061] In a specific embodiment of the present application, the second filter layer 12 transmits light of the first preset spectral bandwidth, and the transmittance of the second filter layer 12 to the light of the first preset spectral bandwidth is greater than or equal to 50% and less than or equal to 100%, and the second filter layer 12 totally reflects or absorbs light other than the light of the first preset spectral bandwidth. This arrangement allows the second filter layer 12 to only allow light from the light source 11 to pass through, avoiding interference of other light on imaging and avoiding color distortion of the picture.

[0062] In an optional embodiment of the present application, the reflection spectrum bandwidth of the first filter layer 30 is the same as the transmission spectrum bandwidth of the second filter layer 12. In another optional embodiment of the present application, the reflection spectrum bandwidth of the first filter layer 30 is different from the transmission spectrum bandwidth of the second filter layer 12. In this case, the reflection spectrum bandwidth of the first filter layer 30 is greater than the transmission spectrum bandwidth of the second filter layer 12. This arrangement can reduce light leakage. Since the light enters the human eye for display after being reflected by the AR lens 20, the reflection spectrum bandwidth of the AR lens 20 covers the spectrum bandwidth of the light source 11, so that the reflectivity covers the spectrum bandwidth range, ensuring that the light emitted by the light source 11 can be fully reflected into the human eye without causing light leakage.

[0063] Specifically, the reflection spectrum bandwidth of the first filter layer 30 of the present application and the transmission spectrum bandwidth of the second filter layer 12 are closely related to the blackbody radiation spectrum curve. The color temperature change of the blackbody radiation spectrum of 2700K-6500K after passing through the first filter layer 30 is less than ±300K, and the luminous flux change is less than 20%, so as to obtain a first filter layer 30 with small color temperature change and high transmittance.

[0064] It should also be noted that the augmented reality device further includes an imaging optical system 13 located on the side of the second filter layer 12 away from the light source 11. The imaging optical system 13 is used to realize image formation. The first filter layer 30 is located on the surface of the AR lens 20 away from the optical engine 10. The first filter layer 30 reflects the light transmitted by the optical engine 10 to the human eye. The human eye and the optical engine 10 are located on the same side of the AR lens 20. The first filter layer 30 and the second filter layer 12 can both be film structures or sheet structures.

[0065] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0068] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An augmented reality device, characterized in that: include: An optical machine (10), comprising a light source (11) and a second filter layer (12) arranged on a light output side of the light source (11); An AR lens (20), wherein the AR lens (20) is located on the light output side of the optical machine (10), and a first filter layer (30) is provided on the AR lens (20), wherein a reflection spectrum bandwidth of the first filter layer (30) is the same as or different from a transmission spectrum bandwidth of the second filter layer (12), and a reflectivity of the first filter layer (30) to a partial spectrum of the light source (11) is greater than or equal to 50%.

2. The augmented reality device according to claim 1, characterized in that The light source (11) is an LED light source, and the spectral bandwidth of the LED light source at least includes a first red light bandwidth, a first blue light bandwidth and a first green light bandwidth.

3. The augmented reality device according to claim 1, characterized in that The total width of the reflection spectrum bandwidth of the first filter layer (30) is less than or equal to 80 nm.

4. The augmented reality device according to claim 1, characterized in that The second filter layer (12) transmits light of a first preset spectral bandwidth, and the transmittance of the second filter layer (12) to light of the first preset spectral bandwidth is greater than or equal to 50% and less than or equal to 100%.

5. The augmented reality device according to claim 4, characterized in that The second filter layer (12) totally reflects or absorbs light rays other than the light rays within the first preset spectral bandwidth.

6. The augmented reality device according to claim 1, characterized in that The first filter layer (30) reflects light of a second preset spectral bandwidth, the second preset spectral bandwidth being different from the spectral bandwidth of the light source (11), the second preset spectral bandwidth comprising at least a second red light bandwidth, a second blue light bandwidth and a second green light bandwidth, and a width of one of the second red light bandwidth, the second blue light bandwidth and the second green light bandwidth being greater than widths of the other two.

7. The augmented reality device according to claim 6, characterized in that The width of the second red light bandwidth is greater than the width of the second blue light bandwidth, and / or the width of the second red light bandwidth is greater than the width of the second green light bandwidth.

8. The augmented reality device according to claim 1, characterized in that: The first filter layer (30) reflects light of a second preset spectral bandwidth, and the reflectivity of the first filter layer (30) to light of the second preset spectral bandwidth is greater than or equal to 60% and less than or equal to 100%.

9. The augmented reality device according to claim 1, characterized in that: When the reflection spectral bandwidth of the first filter layer (30) is different from the transmission spectral bandwidth of the second filter layer (12), the reflection spectral bandwidth of the first filter layer (30) is greater than the transmission spectral bandwidth of the second filter layer (12).

10. The augmented reality device according to claim 1, characterized in that The color temperature of the black body radiation spectrum of 2700K-6500K after passing through the first filter layer (30) changes by less than ±300K, and the luminous flux changes by less than 20%.

Images