Display device, cockpit, and transportation vehicle

Abstract

The present application provides a display device, a cockpit, and a transportation vehicle. The display device comprises a housing, an image source assembly, an imaging assembly, an optical window, and a band-pass film. The band-pass film is located on a path where a display beam is formed. The light transmittance of the band-pass film to a light source matching band is greater than the light transmittance of the band-pass film to a non-light source matching band. In this way, filtering of light at a non-light source matching band is realized, so that the risk of the external visible light entering the display device and forming stray light, and thus glare can be reduced and even eliminated, thereby improving the display effect of the display device.

Description

Display devices, cockpit, and vehicles Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a display device, a cockpit, and a vehicle. Background Technology

[0002] With the development of vehicle technology, more and more intelligent virtual image display products are being installed in vehicles. These products magnify the image source and project it into a distant image, enabling large-format, long-distance display.

[0003] Currently, in order to reduce the interference of external stray light on the use of virtual image display products, an anti-reflection coating layer is usually set on the outside of the optical window of the virtual image display product to achieve high transmittance of visible light, thereby reducing the reflection of external visible light at the optical window and reducing the interference of stray light.

[0004] However, when external light passes through the optical window and enters the interior of the virtual image display product, it can cause adverse phenomena such as glare, which affects the display effect of the virtual image display product. Summary of the Invention

[0005] This application provides a display device, a cockpit, and a vehicle. The display device includes a housing, an image source assembly, an imaging assembly, an optical window, and a bandpass film layer. The bandpass film layer is located in the path of the display beam. The transmittance of the bandpass film layer for light in the matching wavelength band of the light source is greater than that for light in the non-matching wavelength band of the light source, thereby filtering light in the non-matching wavelength band of the light source. This reduces the risk of external visible light entering the display device and forming stray light, which helps to reduce or even eliminate glare and improve the display effect of the display device.

[0006] In a first aspect, this application provides a display device. The display device includes a housing, an image source component, an imaging component, an optical window, and a bandpass film layer; the housing has a receiving space and a mounting port communicating with the receiving space, the image source component and the imaging component are both located in the receiving space and mounted on the housing, and the optical window is mounted on the mounting port; the image source component is used to project an image beam, the image beam can be reflected sequentially by the optical window and the imaging component, and then emitted from the optical window to form a display beam, the display beam is used to form a virtual image; the bandpass film layer is located on the path of forming the display beam; the visible light band includes a light source matching band and a non-light source matching band, the light source matching band is the band of the image beam, and the transmittance of the bandpass film layer for the light source matching band is greater than the transmittance for the light source non-light source matching band.

[0007] In this application, due to the design of the optical window and imaging components, the image beam can be reflected twice before being emitted to form a display beam, thereby increasing the optical path of the image beam and thus increasing the distance of the virtual image formed by the display beam, enabling the formation of a large-format virtual image at a distance. By installing the image source component and imaging component within the housing space, the outer casing can enclose and protect the image source component and imaging component, resulting in higher reliability of the display device.

[0008] In this application, by setting a bandpass film layer, external visible light can be filtered, specifically filtering light in the non-light source matching band of external visible light. This reduces the amount of external visible light entering the housing space, thereby reducing the amount of external visible light entering the housing space, reflecting within the housing space, and passing through the optical window, thus reducing undesirable phenomena such as glare and rainbow patterns. Furthermore, because the bandpass film layer has high transmittance for light in the light source matching band, its setting does not affect the image beam emitted from the image source component, preventing interference with the normal imaging of the display device and improving the display effect.

[0009] The light source matching band may include a red bandpass band, a green bandpass band, and a blue bandpass band, to correspond to the bands of the three primary colors of red, green, and blue in the image beam emitted by the image source component.

[0010] The red bandpass can be from 610nm to 645nm, the green bandpass can be from 505nm to 560nm, and the blue bandpass can be from 445nm to 485nm.

[0011] In some possible implementations, the bandpass film layer is positioned within the optical window.

[0012] In this implementation, by setting a bandpass film layer, as external visible light enters the containment space through the optical window, the bandpass film layer can cut off light rays in the non-source-matching wavelength bands of the external visible light. During the reflection within the containment space and subsequent exit through the optical window, the bandpass film layer can further cut off the non-source-matching wavelength bands of this portion of the light, thereby further reducing the light intensity. This results in a lower intensity of external visible light after reflection within the containment space, reducing interference from external visible light on the viewing display device and improving the display effect. Furthermore, because the bandpass film layer partially cuts off the incident external visible light at the optical window, reducing the light intensity entering the containment space, it also reduces the risk of heat buildup caused by the light entering the containment space, which could damage the components in the display device.

[0013] In some possible implementations, a bandpass film layer is disposed on the imaging component.

[0014] In this implementation, a bandpass film is disposed on the imaging component. After external visible light enters the housing space through the optical window, the bandpass film filters the incoming visible light, blocking light in wavelengths that are not matched to the light source. This reduces the amount of external visible light that passes through the imaging component and the bandpass film and is incident on the image source component, thereby reducing interference from external visible light on the image beam projected by the image source component. It also prevents heat accumulation caused by external visible light incident on the image source component, thus avoiding damage. Furthermore, by blocking light in wavelengths that are not matched to the light source, the bandpass film also reduces the intensity of external visible light exiting through the optical window within the housing space, thereby reducing glare reflectivity and improving display performance.

[0015] In some possible implementations, the optical window includes a beam-splitting film, a substrate, and an absorption device stacked sequentially, with the bandpass film located on the side of the absorption device facing away from the substrate; the beam-splitting film is disposed on the side of the substrate facing the housing space, and is used to reflect the image beam projected by the image source assembly to the imaging assembly, and to transmit the image beam reflected by the imaging assembly; the absorption device includes at least one of a polarizing device and an absorption film.

[0016] In this implementation, a bandpass film layer is disposed on the outside of the optical window. This allows external visible light to be filtered before entering the optical window, blocking out wavelengths that are not matched to the light source. The absorption device further absorbs this external visible light, thereby reducing the amount of external visible light entering the containment space and lowering the light intensity within the space. This reduces the risk of heat buildup caused by the light entering the containment space, which could damage the components in the display device. Furthermore, as the external light entering the containment space is reflected and exits through the optical window, this light is partially absorbed by the absorption device. When the absorbed light passes through the bandpass film layer, wavelengths that are not matched to the light source are blocked, further reducing the risk of glare from external visible light and improving the display effect.

[0017] In some possible implementations, the bandpass film has a transmittance of 90% or more for the light source matching wavelength band.

[0018] In this implementation, since the bandpass film layer is disposed on the outside of the optical window, the transmittance of the bandpass film layer to the light source matching wavelength satisfies the above relationship, so that the bandpass film layer can achieve high transmittance, which can reduce the risk of external visible light being reflected on the surface of the bandpass film layer to form stray light, thereby improving the display effect of the display device.

[0019] In some possible implementations, the optical window includes a beam-splitting film, a substrate, an absorption device, and an anti-reflection film stacked sequentially, with a bandpass film located between the absorption device and the substrate; the beam-splitting film is disposed on the side of the substrate facing the receiving space, and is used to reflect the image beam projected by the image source assembly to the imaging assembly, and to transmit the image beam reflected by the imaging assembly; the absorption device includes at least one of a polarizing device and an absorption film; the anti-reflection film has a transmittance of visible light greater than or equal to a preset value.

[0020] In this implementation, by setting a bandpass film layer, the bandpass film layer can not only cut off the non-light source matching band in the external visible light, but also work with the absorption device to absorb the external visible light. This reduces the amount of external visible light entering the containment space, thereby reducing the risk of heat buildup caused by external visible light entering the containment space and damaging the components in the display device, and also reducing glare caused by external visible light and improving the display effect.

[0021] The anti-reflective coating layer achieves high transmittance of visible light to prevent external visible light from reflecting off the outer surface of the optical window and causing stray light to interfere with the viewing experience of the display device. For example, the anti-reflective coating layer can achieve a transmittance of greater than or equal to 96% for light in the 420nm to 680nm wavelength range, thereby achieving a low reflectance of external visible light at the anti-reflective coating layer and reducing the impact of external stray light on the viewing experience of the display device.

[0022] In some possible implementations, the bandpass membrane layer includes a membrane body and at least one metal membrane; the metal membrane is disposed on the side of the membrane body facing the substrate, and / or, the metal membrane is disposed on the side of the membrane body facing away from the substrate, and / or, the metal membrane is disposed within the membrane body.

[0023] In this implementation, the bandpass film is a composite film that can achieve a higher light transmittance in the matching band of the light source than in the non-matching band, thus blocking light in the non-matching band. It can also use a metal film to absorb visible light, thereby improving the blocking effect of the bandpass film on external visible light and further reducing the visible light entering the containment space.

[0024] In some possible implementations, the material of the metal film includes at least one of nickel, chromium, tantalum, silver, gold, copper, zinc, aluminum, titanium, and their alloys, so that the metal film has a good light absorption effect, thereby improving the light absorption effect of the bandpass film layer and helping to reduce visible light entering the containment space.

[0025] In some possible implementations, the transmittance of the bandpass film to the matching wavelength of the light source is in the range of 60% to 96%, the reflectance of the bandpass film to the matching wavelength of the light source is in the range of 4% to 15%, and the absorption rate of the bandpass film to the matching wavelength of the light source is in the range of 0% to 25%.

[0026] In this implementation, the bandpass film layer is designed with high transmittance, reflectance, and absorptance for the light source matching band. This allows the bandpass film layer to achieve high transmittance for light in the light source matching band and low transmittance for light in the non-light source matching band. It can also absorb and reflect light in the light source matching band, which helps to further reduce external visible light entering the containment space. This reduces the risk of heat buildup caused by external visible light entering the containment space and damaging the components in the display device, and also reduces glare caused by external visible light, thus improving the display effect.

[0027] In some possible implementations, the optical window includes a substrate, an absorbing device, and an antireflection film layer stacked sequentially; a bandpass film layer is disposed on the side of the substrate facing the receiving space, the bandpass film layer is used to reflect the image beam projected by the image source component to the imaging component, and is used to transmit the image beam reflected by the imaging component; the absorbing device includes at least one of a polarizing device and an absorbing film; the transmittance of the antireflection film layer to visible light is greater than or equal to a preset value.

[0028] In this implementation, through the design of the bandpass film layer, the bandpass film layer can not only cut off light in non-light source matching bands, but also reflect the image beam projected by the image source component and the image beam reflected through the imaging component, so as to realize the optical path folding in the display device. In other words, the bandpass film layer in this embodiment can not only reduce glare reflectivity, but also perform light splitting function.

[0029] In some possible implementations, the bandpass membrane layer includes a membrane body and at least one metal membrane; the metal membrane is disposed on the side of the membrane body facing the substrate, and / or, the metal membrane is disposed on the side of the membrane body facing away from the substrate, and / or, the metal membrane is disposed within the membrane body.

[0030] In this implementation, the bandpass film is a composite film that not only ensures that the transmittance of light in the matched wavelength band of the light source is greater than that in the unmatched wavelength band, thus blocking light in the unmatched band, but also utilizes a metal film to absorb visible light, thereby improving the blocking effect of the bandpass film on external visible light and further reducing the amount of visible light entering the containment space. Furthermore, the design of the metal film layer allows for adjustment of the light transmittance and reflectance of the bandpass film to achieve a beam splitting function.

[0031] The metal film is made of at least one of nickel, chromium, tantalum, silver, gold, copper, zinc, aluminum, titanium, and their alloys, so that the metal film has a good light absorption effect, thereby improving the light absorption effect of the bandpass film layer and helping to reduce visible light entering the containment space.

[0032] In some possible implementations, the transmittance of the bandpass film to the matching wavelength of the light source is in the range of 40% to 70%, the reflectance of the bandpass film to the matching wavelength of the light source is in the range of 30% to 60%, and the absorption rate of the bandpass film to the matching wavelength of the light source is in the range of 0% to 30%.

[0033] In this implementation, the bandpass film layer is designed with high transmittance, reflectance, and absorptivity for the light source matching wavelength band. This allows the bandpass film layer to achieve high transmittance for the light source matching wavelength band and low transmittance for the non-light source matching wavelength band. It also absorbs and reflects the light source matching wavelength band, which helps to further reduce external visible light entering the housing space. This reduces the risk of heat buildup caused by external visible light entering the housing space and damaging the components in the display device, and also reduces glare caused by external visible light, improving the display effect. Furthermore, the bandpass film layer can also perform beam splitting to achieve optical path folding for the display device.

[0034] In some possible implementations, the housing includes a first mounting wall, a second mounting wall, and a third mounting wall, with the first mounting wall and the second mounting wall arranged opposite to each other, and the third mounting wall and the second mounting wall arranged opposite to each other; the image source component is mounted on the first mounting wall, the second mounting wall has a mounting opening, the optical window is mounted on the second mounting wall and covers the mounting opening, and the imaging component is mounted on the third mounting wall.

[0035] In this implementation, due to the structural design of the housing, the optical window can be positioned opposite both the image source component and the imaging component. This allows the optical window to both receive the image beam projected from the image source component and reflect the image beam to the imaging component, and then emit the image beam reflected by the imaging component to form a display beam. The optical architecture of this implementation can be called the Birdbath optical architecture.

[0036] In some possible implementations, the housing includes a first mounting wall and a second mounting wall, which are disposed opposite to each other; the image source assembly is mounted on the first mounting wall, the second mounting wall has a mounting opening, the optical window is mounted on the second mounting wall and covers the mounting opening, and the imaging assembly is located between the image source assembly and the optical window; the imaging assembly is also used to project an image beam toward the optical window through the image source assembly.

[0037] In this implementation, the image beam emitted from the image source component passes through the imaging component and is reflected sequentially at the optical window and the imaging component before exiting through the optical window. This increases the optical path length of the image beam within the housing, thereby increasing the size and distance of the virtual image. Furthermore, since the imaging component is positioned between the optical window and the image source component, the overall size of the display device can be further reduced, enabling a miniaturized design. The optical architecture of this implementation can be referred to as the Pancake optical architecture.

[0038] In some possible implementations, the imaging component is located between the image source component and the optical window, and the imaging component is also used to project an image beam toward the optical window through the image source component; the bandpass film layer is disposed on the side of the imaging component facing the optical window, or on the side of the imaging component facing the image source component.

[0039] In this implementation, a bandpass film is disposed on the imaging component. After external visible light enters the housing space through the optical window, the bandpass film filters the incoming visible light, blocking light in wavelengths that are not matched to the light source. This reduces the amount of external visible light that passes through the imaging component and the bandpass film and is incident on the image source component, thereby reducing interference from external visible light on the image beam projected by the image source component. It also prevents heat accumulation caused by external visible light incident on the image source component, thus avoiding damage. Furthermore, by blocking light in wavelengths that are not matched to the light source, the bandpass film also reduces the intensity of external visible light exiting through the optical window within the housing space, thereby reducing glare reflectivity and improving display performance.

[0040] In some possible implementations, the bandpass film has a transmittance of 30% or more for the light source matching wavelength band.

[0041] In this implementation, the transmittance of the bandpass film layer for the light source matching wavelength band satisfies the aforementioned relationship. This facilitates the bandpass film layer's ability to cut off non-light source matching wavelength bands of external visible light entering the housing space. This reduces the amount of external visible light that passes through the imaging component and the bandpass film layer and is incident on the image source component, thereby reducing interference from external visible light on the image beam projected by the image source component. Furthermore, it prevents heat accumulation caused by external visible light incident on the image source component, thus avoiding damage. In addition, by cutting off non-light source matching wavelength bands, the bandpass film layer also reduces the intensity of external visible light exiting through the optical window within the housing space, thereby reducing glare reflectivity and improving display performance.

[0042] In some possible implementations, the bandpass film is made of at least two of magnesium fluoride, silicon oxide, silicon nitride, titanium oxide, and niobium oxide, so that the bandpass film can block light in non-light source matching bands, thereby reducing the number of non-light source matching bands passing through the bandpass film.

[0043] In some possible implementations, the bandpass film has a transmittance of less than or equal to 20% for light in non-light source matched bands.

[0044] In this implementation, the transmittance of the bandpass film layer for light in non-light source matching bands satisfies the above relationship, so that the bandpass film layer can block light in non-light source matching bands in external visible light, thereby reducing the light passing through the bandpass film layer, thereby reducing the risk of external visible light entering the containment space and being reflected out of the display device to form stray light, thus improving the user experience of the display device.

[0045] In some possible implementations, the visible light from outside the display device incident on the optical window is a first ray, the first ray has a first light intensity, the first ray enters the housing space through the optical window, and after exiting the optical window, it forms a second ray, the light in the second ray that is not in the light source matching band has a second light intensity, and the ratio of the second light intensity to the first light intensity is less than or equal to 2%.

[0046] In this implementation, the bandpass film is designed to cut off light in non-light source matching bands. As external visible light enters the containment space through the optical window and is reflected out of the containment space, the bandpass film can cut off light in the non-light source matching bands of the external visible light, thereby reducing the light in the second light and thus reducing the light intensity of the second light. This reduces the risk of stray light formed by external visible light entering the containment space and being reflected within the containment space, i.e., it reduces the glare reflectivity and helps to reduce interference with the viewing display device.

[0047] Secondly, this application provides a cockpit. The cockpit includes a display device as described in any of the first aspects.

[0048] In this application, the display device can reduce glare, rainbow patterns and other adverse phenomena through the design of the bandpass film layer, thereby improving the display effect, which in turn improves the viewing effect of the display device in the cockpit and enhances the user experience of the cockpit.

[0049] Thirdly, this application provides a means of transportation. The means of transportation includes a vehicle and a display device as described in any of the first aspects, the display device being mounted on the vehicle, or includes a cabin as described in any of the second aspects, the cabin being mounted on the vehicle.

[0050] In this application, the display device can reduce glare, rainbow patterns and other adverse phenomena through the design of the bandpass film layer, thereby improving the display effect and thus improving the effect of using the display device in vehicles, and thus improving the user experience of vehicles. Attached Figure Description

[0051] Figure 1 is a schematic diagram of the vehicle provided in this application in some embodiments;

[0052] Figure 2 is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some embodiments;

[0053] Figure 3 is a schematic diagram of the structure of the optical window in the display device shown in Figure 2 in some embodiments;

[0054] Figure 4 is a schematic diagram of the glare reflectivity of the display device shown in Figure 2;

[0055] Figure 5 is a schematic diagram of the optical window in the display device shown in Figure 2 in some other embodiments;

[0056] Figure 6 is a schematic diagram of the light transmittance of the bandpass film layer in the optical window shown in Figure 5;

[0057] Figure 7 is a schematic diagram of the structure of the optical window in the display device shown in Figure 2 in some other embodiments;

[0058] Figure 8 is a schematic diagram of the structure of the optical window in the display device shown in Figure 2 in some other embodiments;

[0059] Figure 9 is a structural schematic diagram of the display device in the vehicle shown in Figure 1 in some other embodiments;

[0060] Figure 10 is a schematic diagram of the bandpass film layer disposed in the imaging component in some embodiments of the display device shown in Figure 9;

[0061] Figure 11 is a schematic diagram of the structure of the display device in the vehicle shown in Figure 1 in some other embodiments. Detailed Implementation

[0062] The embodiments of this application are described below with reference to the accompanying drawings.

[0063] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Multiple" refers to at least two.

[0064] The directional terms mentioned in the embodiments of this application, such as "upper", "lower", "inner", "outer", "top", "bottom", "side", etc., are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the embodiments of this application, the relative positional relationships mentioned, such as parallel, perpendicular, and aligned, are defined in relation to the current technological level, rather than being absolutely strict. Slight deviations are permissible; approximations of parallelism, perpendicularity, or alignment are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0066] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0067] Please refer to Figure 1, which is a schematic diagram of the vehicle 100 provided in this application in some embodiments.

[0068] In some embodiments, the vehicle 100 can be a car, rail vehicle, ship, aircraft, etc. The vehicle can be, but is not limited to, a sedan, multi-purpose vehicle (MPV), sport / suburban utility vehicle (SUV), off-road vehicle (ORV), pickup truck, van, bus, truck, etc. In the embodiment shown in Figure 1, the vehicle 100 is described as a car; however, other types of vehicles 100 can also adopt similar structures, which will not be elaborated further below.

[0069] In some embodiments, the vehicle 100 may include a cabin 10 and a vehicle 20, with the cabin 10 mounted on the vehicle 20. For example, when the vehicle 100 is a vehicle, the vehicle 20 may be the vehicle body, and the cabin 10 may be the front or rear cabin of the vehicle.

[0070] For example, the cockpit 10 may include a display device 1, a first seat 2, a second seat 3, and a mounting platform 4. The first seat 2 is closer to the mounting platform 4 than the second seat 3. The mounting platform 4 may be the instrument panel (IP) of the cockpit 10. In this embodiment, the display device 1 can be used to provide entertainment interaction or to provide the user with driver assistance information.

[0071] In some examples, the display device 1 can be mounted on the mounting platform 4 for use by a user located in the first seat 2. The display device 1 can be fixedly mounted on the mounting platform 4, or it can be movably mounted on the mounting platform 4 for storage and display.

[0072] In other examples, the display device 1 may also be installed on the side of the first seat 2 facing away from the mounting platform 4 for use by the user in the second seat 3. The display device 1 may be suspended from the first seat 2, or at least partially embedded within the first seat 2. It should be noted that the display device 1 may be installed on the backrest of the first seat 2 or on the headrest of the first seat 2; specific installation is not limited here.

[0073] The display device 1 can be a light field screen, which can magnify the image source several times and form a projected virtual image at a distance through optical structures such as birdbath optical architecture or pancake optical architecture, thereby realizing a large-format, long-distance, relatively static display in the cockpit 10. For example, the display device 1 can magnify the image source 8 to 12 times and form a projected virtual image at a distance of 2 to 3.5m.

[0074] It should be noted that the display devices 1 with Birdbath optical architecture and Pancake optical architecture will be described in detail later.

[0075] It is understood that Figure 1 only schematically shows some of the components included in the vehicle 100 and cabin 10. The actual shape, size, location and construction of these components are not limited to Figure 1. The vehicle 100 and cabin 10 may also include more or fewer components than those in Figure 1.

[0076] For example, in some other embodiments, the cockpit 10 may include only the first seat 2 and exclude the second seat 3.

[0077] For example, in some other embodiments, the cockpit 10 may also include a controller (not shown) that can control the display device 1, such as controlling the attitude adjustment of the display device 1, controlling the human-computer interaction of the display device 1, controlling the interaction between the display device 1 and other devices in the cockpit 10 or the vehicle 100, etc.

[0078] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the structure of the display device 1 in the vehicle 100 shown in Figure 1 in some embodiments; Figure 3 is a schematic diagram of the structure of the optical window 14 in the display device 1 shown in Figure 2 in some embodiments.

[0079] In some embodiments, the display device 1 may include a housing 11, an image source component 12, an imaging component 13, and an optical window 14. The image source component 12, the imaging component 13, and the optical window 14 are all mounted on the housing 11. The image source component 12 is used to project an image beam. The image beam can be reflected sequentially by the optical window 14 and the imaging component 13, and then emitted from the optical window 14 to form a display beam. The display beam is used to form a virtual image (see W1 in Figure 2).

[0080] In this embodiment, due to the design of the optical window 14 and the imaging component 13, the image beam can be emitted after two reflections to form a display beam, which increases the optical path of the image beam and thus increases the distance of the virtual image formed by the display beam, so as to form a large-format virtual image at a distance.

[0081] It should be noted that the dashed line with arrows in Figure 2 is a schematic diagram of the beam path of display device 1.

[0082] For example, the housing 11 may have a receiving space 111 and a mounting port 1131 communicating with the receiving space 111. The image source component 12 and the imaging component 13 are both located in the receiving space 111 and mounted on the housing 11, and the optical window 14 is mounted on the mounting port 1131.

[0083] In this embodiment, by installing the image source component 12 and the imaging component 13 within the housing space 111, the housing 11 can enclose and protect the image source component 12 and the imaging component 13, thereby improving the reliability of the display device 1.

[0084] The housing 11 may include a first mounting wall 112, a second mounting wall 113, and a third mounting wall 114. The first mounting wall 112 may be disposed opposite to the second mounting wall 113, and the third mounting wall 114 may be disposed opposite to the second mounting wall 113. The image source component 12 may be mounted on the first mounting wall 112. The second mounting wall 113 may have a mounting opening 1131, and the optical window 14 may be mounted on the second mounting wall 113 and cover the mounting opening 1131. The imaging component 13 may be mounted on the third mounting wall 114.

[0085] In this embodiment, due to the structural design of the housing 11, the optical window 14 can be positioned opposite both the image source component 12 and the imaging component 13. This allows the optical window 14 to receive the image beam projected from the image source component 12, reflect the image beam to the imaging component 13, and then emit the image beam reflected by the imaging component 13 to form a display beam. The optical architecture of this embodiment can be referred to as the Birdbath optical architecture.

[0086] It should be noted that the display device 1 shown in Figure 2 is only schematic and does not limit the specific structure of the housing 11. The housing 11 may also include more walls, such as the mounting wall connecting the first mounting wall 112 and the second mounting wall 113, the mounting wall connecting the second mounting wall 113 and the third mounting wall 114, etc., which are designed according to actual needs.

[0087] The outer casing 11 can enclose the image source component 12, preventing external moisture, dust, and other impurities from corroding it. Specifically, other mounting walls (not limited to the second mounting wall 113 and the third mounting wall 114) are connected to both sides of the first mounting wall 112, making the first mounting wall 112 the middle of a C-shaped shell structure. In this case, the image source component 12, mounted on the first mounting wall 112, can be enclosed by the mounting walls on both sides, thus forming waterproof protection for the image source component 12. Furthermore, when the display device 1 is applied to the cockpit 10 or the vehicle 100, the light-emitting surface of the image source component 12 is prevented from facing upwards or diagonally upwards. This prevents moisture and other contaminants from directly intruding into the image source component 12, which helps improve the waterproof effect of the image source component 12. For example, it can achieve an IP52 level of waterproofing.

[0088] For example, the image source component 12 can be, but is not limited to, a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, a quantum dot light-emitting diode (QLED) display, a mini light-emitting diode (Mini LED) display, a micro light-emitting diode (Micro LED) display, a liquid crystal on silicon (LCOS) projection image source, a digital light processing (DLP) projection image source, etc.

[0089] For example, the imaging component 13 may be, but is not limited to, one or a combination of one or more of the following: a freeform mirror, a lens / lens group, a superlens, a waveguide device, a diffractive optical device, etc.

[0090] For example, the optical window 14 may include a beam-splitting film layer 141, a substrate 142, an absorption device 143, an anti-reflection film layer 144, etc., stacked sequentially, wherein the beam-splitting film layer 141 is disposed on the side of the substrate 142 facing the receiving space 111. The optical window 14 can reflect the image beam emitted from the image source component 12 to the imaging component 13, and form a display beam through the beam reflected by the imaging component 13 to form a virtual image.

[0091] The beam-splitting film layer 141 plays a beam-splitting role, which can reflect the image beam emitted from the image source component 12 to the imaging component 13, and the beam reflected by the imaging component 13 plays a role in optical path folding.

[0092] The substrate 142 serves to support and bear the various film layers. The substrate 142 may be made of one or more of the following materials: polymethyl methacrylate (PMMA), polycarbonate (PC), triacetate cellulose (TAC), and glass. The glass may include silicon dioxide (SiO2) and other oxides.

[0093] The absorption device 143 may include, but is not limited to, polarizing devices and absorption films. The absorption device 143 is used to absorb external stray light, thereby reducing the risk of external stray light entering the display device 1.

[0094] The polarization device may include, but is not limited to, linear polarizers, quarter-wave plates, half-wave plates and combinations thereof, to filter light and thereby reduce the risk of external stray light entering the display device 1.

[0095] The absorption film may include, but is not limited to, optically clear adhesive (OCA) with different transmittance, multilayer polarizers (the included angle between the absorption axes of different layers of polarizers is greater than 0° and less than or equal to 90°), and combinations thereof.

[0096] The antireflective coating 144 achieves high transmittance of visible light to prevent external visible light from reflecting off the outer surface of the optical window 14 and causing stray light to interfere with the viewing effect of the display device 1. For example, the antireflective coating 144 can achieve a transmittance of greater than or equal to 96% for light in the 420nm to 680nm wavelength range, thereby achieving a low reflectance of external visible light at the antireflective coating 144 and reducing the impact of external stray light on the viewing display device 1.

[0097] The optical window 14 may also include an anti-fingerprint coating (not shown in the figure). The anti-fingerprint coating can be the outermost layer of the optical window 14, which can reduce the fingerprints left by the user touching the optical window 14 and play an anti-fingerprint role. The water droplet angle of the anti-fingerprint coating can be greater than or equal to 90° to give it good anti-fingerprint performance.

[0098] The optical window 14 may also include metal electrodes (not shown) to enable touch functionality, expanding the interactive functions of the display device 1 and thus improving the user experience. The metal electrodes may be grown on the substrate 142.

[0099] It should be noted that the specific structure of the optical window 14 shown in Figure 3 is only schematic. In some other embodiments, the optical window 14 may include more or fewer components.

[0100] Please refer to Figures 2 to 4. Figure 4 is a schematic diagram of the glare reflectivity of the display device 1 shown in Figure 2.

[0101] In some embodiments, the display device 1 may further include a bandpass film layer (not shown), which may be located in the path of forming the display beam. In other words, the bandpass film layer may be disposed on the optical window 14, or on the imaging component 13, or on the image source component 12, or between the optical window 14 and the imaging component 13, or between the imaging component 13 and the image source component 12. The visible light band includes a light source matching band and a non-light source matching band, where the light source matching band is the band of the image beam. The transmittance of the bandpass film layer for the light source matching band is greater than its transmittance for the light source non-light source matching band.

[0102] In this embodiment, by setting a bandpass filter, external visible light can be filtered, specifically, light in the non-light source matching band of external visible light is filtered, thereby reducing the amount of external visible light entering the housing space 111. This reduces the amount of external visible light entering the housing space 111 and being reflected within the housing space 111 and passing through the optical window 14, thereby reducing glare, rainbow patterns, and other undesirable phenomena. Furthermore, since the bandpass filter has high transmittance for light in the light source matching band, its setting does not affect the image beam emitted from the image source component 12, thus avoiding interference with the normal imaging of the display device 1 and improving the display effect.

[0103] For example, the light source matching band may include a red bandpass band, a green bandpass band, and a blue bandpass band, to correspond to the bands of the three primary colors of red, green, and blue in the image beam emitted by the image source component 12.

[0104] The red bandpass can be from 610nm to 645nm, the green bandpass can be from 505nm to 560nm, and the blue bandpass can be from 445nm to 485nm.

[0105] It should be noted that the light bands corresponding to the three primary colors mentioned above are only examples. The light bands corresponding to the three primary colors of the emitted image beams of different specifications or types of image source components 12 may have some differences. The bandpass film layer can be adaptively adjusted according to the specific design of the image source component 12.

[0106] For example, the transmittance of the bandpass film to the non-light source matching band is less than or equal to 20%. For instance, the transmittance of the bandpass film to the non-light source matching band can be, but is not limited to, 20%, or 17%, or 15%, or 10%, or 8%, or 5%, or 3%, or 1%, or 0%, or other values ​​less than 20%.

[0107] In this embodiment, the transmittance of the bandpass film layer for light in non-light source matching bands satisfies the above relationship, so that the bandpass film layer can block light in non-light source matching bands in external visible light, thereby reducing the light passing through the bandpass film layer, thereby reducing the risk of external visible light entering the housing space 111 and being reflected out of the display device 1 to form stray light, thereby improving the user experience of the display device 1.

[0108] The non-light source matching bands can include bands between the red and green bandpass bands, and bands between the green and blue bandpass bands. For example, the bands from 560nm to 610nm, and the bands from 485nm to 505nm.

[0109] The bandpass film can include at least two materials with different refractive indices, so that the bandpass film can block light from non-light source matching bands, thereby reducing the non-light source matching bands passing through the bandpass film.

[0110] The material of the bandpass film may include at least two of magnesium fluoride, silicon oxide, silicon nitride, titanium oxide, and niobium oxide.

[0111] For example, the visible light from outside the display device 1 incident on the optical window 14 is a first ray, and the first ray has a first light intensity. The first ray enters the receiving space 111 through the optical window 14 and is emitted from the optical window 14 to form a second ray, and the light in the second ray that is not in the light source matching band has a second light intensity. The ratio of the second light intensity to the first light intensity can be less than or equal to 2%. For example, the ratio of the second light intensity to the first light intensity can be, but is not limited to, 2%, or 1.8%, or 1.5%, or 1.1%, or 0.8%, or 0.6%, or 0.4%, or 0.2%, or 0.1%, or 0, or other values ​​less than 2%.

[0112] In this embodiment, because the bandpass film layer is designed to cut off light in non-light source matching bands, when external visible light enters the housing space 111 through the optical window 14 and is reflected out of the housing space 111, the bandpass film layer can cut off light in the non-light source matching bands of the external visible light, thereby reducing the light in the second light in the non-light source matching bands, and thus reducing the light intensity of the second light. This can reduce the risk of stray light formed by external visible light entering the housing space 111 and being reflected within the housing space 111, that is, reduce the glare reflectivity, which is beneficial to reduce interference with the viewing display device 1.

[0113] Please refer to Figures 2, 5, and 6. Figure 5 is a structural schematic diagram of the optical window 14 in the display device 1 shown in Figure 2 in some other embodiments; Figure 6 is a schematic diagram of the light transmittance of the bandpass film layer 15 in the optical window 14 shown in Figure 5. It should be noted that the optical window 14 shown in Figure 5 may include at least some of the features of the optical window 14 shown in Figure 3, and the same features will not be described again here.

[0114] In some embodiments, the bandpass film layer 15 may be disposed on the optical window 14.

[0115] In this embodiment, by providing a bandpass film layer 15, during the process of external visible light entering the receiving space 111 through the optical window 14, the bandpass film layer 15 can block light rays in the external visible light that are not matched with the light source. During the process of external visible light entering the receiving space 111 being reflected within the receiving space 111 and exiting through the optical window 14, the bandpass film layer 15 can further block light rays in the non-matched light source bands, thereby further reducing the light intensity. This results in a lower intensity of external visible light after reflection within the receiving space 111, reducing interference from external visible light on the viewing display device 1 and improving the display effect. Furthermore, since the bandpass film layer 15 partially blocks the incident external visible light at the optical window 14, reducing the light intensity entering the receiving space 111, it also reduces the risk of heat buildup caused by the light entering the receiving space 111, which could damage the components in the display device 1.

[0116] For example, the optical window 14 may include a beam-splitting film layer 141, a substrate 142 and an absorption device 143 stacked in sequence, with a bandpass film layer 15 located on the side of the absorption device 143 facing away from the substrate 142, and the beam-splitting film layer 141 disposed on the side of the substrate 142 facing the receiving space 111.

[0117] In this embodiment, the bandpass film layer 15 is disposed on the outside of the optical window 14 so that external visible light is filtered by the bandpass film layer 15 before entering the optical window 14, cutting off light in the non-source-matching wavelength band of the external visible light. The absorption device 143 can further absorb the external visible light, thereby further reducing the external visible light entering the housing space 111, and thus reducing the light intensity entering the housing space 111, thereby reducing the risk of heat accumulation caused by the light entering the housing space 111 and damaging the devices in the display device 1. In addition, during the process of external light entering the housing space 111 being reflected and emitted through the optical window 14, this part of the light is partially absorbed by the absorption device 143. When the light absorbed by the absorption device 143 passes through the bandpass film layer 15, the light in the non-source-matching wavelength band is cut off, thus further reducing the risk of glare caused by external visible light and improving the display effect.

[0118] The light transmittance of the bandpass film layer 15 to the matching wavelength of the light source can be greater than or equal to 90%. For example, the light transmittance of the bandpass film layer 15 to the matching wavelength of the light source can be, but is not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, or other values ​​greater than 90%.

[0119] In this embodiment, since the bandpass film layer 15 is disposed on the outside of the optical window 14, the transmittance of the bandpass film layer 15 to the light source matching wavelength satisfies the above relationship, so that the bandpass film layer 15 can achieve high transmittance, which can reduce the risk of external visible light being reflected on the surface of the bandpass film layer 15 to form stray light, thereby improving the display effect of the display device 1.

[0120] It should be noted that when the light emitted by the image source component 12 is polarized light, the design of each film layer in the display device 1 can be adaptively adjusted to adapt to the light emitted by the image source component 12.

[0121] Please refer to Figures 2 and 7. Figure 7 is a schematic diagram of the structure of the optical window 14 in the display device 1 shown in Figure 2 in some other embodiments. It should be noted that the optical window 14 shown in Figure 7 may include at least some of the features of the optical window 14 shown in Figure 3, and the same features will not be described again here.

[0122] In some embodiments, the optical window 14 may include a beam-splitting film 141, a substrate 142, an absorption device 143, and an anti-reflection film 144 stacked sequentially, with a bandpass film 15 located between the absorption device 143 and the substrate 142.

[0123] In this embodiment, by setting the bandpass film layer 15, the bandpass film layer 15 can not only cut off the non-light source matching band in the external visible light, but also work with the absorption device 143 to absorb the external visible light, thereby reducing the amount of external visible light entering the housing space 111. This reduces the risk of heat buildup caused by external visible light entering the housing space 111 and damaging the devices in the display device 1, and also reduces glare caused by external visible light, thus improving the display effect.

[0124] For example, the bandpass film 15 may include a film body 151 and at least one metal film 152. The film body 151 is used to block light in non-light source matching bands, and the metal film 152 is used to absorb visible light.

[0125] In this embodiment, the bandpass film 15 is a composite film layer, which can achieve a higher light transmittance in the matching band of the light source than in the non-matching band of the light source, so as to cut off the light in the non-matching band of the light source. It can also use the metal film 152 to absorb visible light, thereby improving the blocking effect of the bandpass film 15 on external visible light, and further reducing the visible light entering the containment space 111.

[0126] The metal film 152 layer can be disposed on the side of the film body 151 facing the substrate 142, and / or, the metal film 152 can be disposed on the side of the film body 151 facing away from the substrate 142, and / or, the metal film 152 can be disposed inside the film body 151.

[0127] It should be noted that Figure 7 illustrates the number of metal film 152 layers as 1, and the metal film 152 layers are disposed on the side of the film body 151 facing away from the substrate 142. The number and specific location of the metal film 152 layers are not limited.

[0128] The material of the metal film 152 may include at least one of nickel, chromium, tantalum, silver, gold, copper, zinc, aluminum, titanium, and their alloys, so that the metal film 152 has a good light absorption effect, thereby improving the light absorption effect of the bandpass film layer 15 and helping to reduce the visible light entering the containment space 111.

[0129] For example, the light transmittance of the bandpass film 15 to the matching wavelength of the light source can be in the range of 60% to 96%, the light reflectance of the bandpass film 15 to the matching wavelength of the light source can be in the range of 4% to 15%, and the light absorption rate of the bandpass film 15 to the matching wavelength of the light source can be in the range of 0% to 25%.

[0130] For example, the light transmittance of the bandpass film layer 15 for matching wavelengths of light sources can be, but is not limited to, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 96%, or other values ​​between 60% and 96%.

[0131] For example, the light reflectance of the bandpass film 15 to the matching band of the light source can be, but is not limited to, 4%, 6%, 8%, 10%, 12%, 14%, 15%, or other values ​​between 4% and 15%.

[0132] For example, the light absorption rate of the bandpass film layer 15 for the matching wavelength of the light source can be, but is not limited to, 0, or 2%, or 5%, or 8%, or 11%, or 14%, or 17%, or 20%, or 22%, or 25%, or other values ​​between 0 and 25%.

[0133] In this embodiment, by designing the transmittance, reflectance, and absorptance of the light source matching band through the bandpass film layer 15, the bandpass film layer 15 can achieve high transmittance of light in the light source matching band and low transmittance of light in the non-light source matching band. It can also absorb and reflect light in the light source matching band, which helps to further reduce external visible light entering the housing space 111. This reduces the risk of heat buildup caused by external visible light entering the housing space 111 and damaging the devices in the display device 1, and also reduces glare caused by external visible light, thus improving the display effect.

[0134] Please refer to Figures 2 and 8. Figure 8 is a schematic diagram of the structure of the optical window 14 in the display device 1 shown in Figure 2 in some other embodiments. It should be noted that the optical window 14 shown in Figure 7 may include at least some of the features of the optical windows 14 shown in Figures 3 and 7, and the same features will not be described again here.

[0135] In some embodiments, the optical window 14 may include a substrate 142, an absorption device 143 and an anti-reflection film layer 144 stacked sequentially, and a bandpass film layer 15 disposed on the side of the substrate 142 facing the receiving space 111. The bandpass film layer 15 is used to reflect the image beam projected by the image source component 12 to the imaging component 13 and to transmit the image beam reflected by the imaging component 13.

[0136] In this embodiment, through the design of the bandpass film layer 15, the bandpass film layer 15 can not only cut off light in non-light source matching bands, but also reflect the image beam projected by the image source component 12 and the image beam reflected through the imaging component 13, so as to realize the optical path folding in the display device 1. In other words, the bandpass film layer 15 in this embodiment can not only reduce glare reflectivity, but also perform light splitting function.

[0137] For example, the bandpass membrane 15 may include a membrane body 151 and at least one metal membrane 152.

[0138] In this embodiment, the bandpass film layer 15 is a composite film layer. It can achieve a higher light transmittance in the matching wavelength band of the light source than in the non-matching wavelength band, thus blocking light in the non-matching wavelength band. Furthermore, the metal film 152 can absorb visible light, thereby improving the blocking effect of the bandpass film layer 15 on external visible light and further reducing the visible light entering the containment space 111. In addition, the design of the metal film 152 layer allows for adjustment of the light transmittance and reflectance of the bandpass film layer 15 to achieve a beam splitting function.

[0139] The metal film 152 may be disposed on the side of the film body 151 facing the substrate 142, and / or the metal film 152 may be disposed on the side of the film body 151 facing away from the substrate 142, and / or the metal film 152 may be disposed inside the film body 151.

[0140] It should be noted that Figure 8 illustrates the number of metal film 152 layers as 1, and the metal film 152 layers are disposed on the side of the film body 151 facing the substrate 142. The number and specific location of the metal film 152 layers are not limited.

[0141] For example, the light transmittance of the bandpass film 15 to the matching wavelength of the light source can be in the range of 40% to 70%, the light reflectance of the bandpass film 15 to the matching wavelength of the light source can be in the range of 30% to 60%, and the light absorption rate of the bandpass film 15 to the matching wavelength of the light source can be in the range of 0% to 30%.

[0142] For example, the light transmittance of the bandpass film layer 15 for the matched wavelength band of the light source can be, but is not limited to, 40%, 45%, 50%, 55%, 60%, 65%, 70%, or other values ​​between 40% and 70%.

[0143] For example, the reflectivity of the bandpass film 15 for the matching band of the light source can be, but is not limited to, 30%, 35%, 40%, 45%, 50%, 55%, 60%, or other values ​​between 30% and 60%.

[0144] For example, the light absorption rate of the bandpass film 15 for the matching wavelength of the light source can be, but is not limited to, 0, 5%, 10%, 15%, 20%, 25%, 30%, or other values ​​between 0 and 30%.

[0145] In this embodiment, the bandpass film layer 15 is designed with high transmittance, reflectance, and absorptance for the light source matching wavelength band. This allows the bandpass film layer 15 to achieve high transmittance for light in the light source matching wavelength band and low transmittance for light in non-light source matching wavelength bands. It also absorbs and reflects light in the light source matching wavelength band, which helps to further reduce external visible light entering the housing space 111. This reduces the risk of heat buildup caused by external visible light entering the housing space 111, potentially damaging the devices in the display device 1, and also reduces glare caused by external visible light, improving the display effect. Furthermore, the bandpass film layer 15 also enables beam splitting, allowing for optical path folding of the display device 1.

[0146] Please refer to Figure 9, which is a structural schematic diagram of the display device 1 in the vehicle 100 shown in Figure 1 in some other embodiments. It should be noted that the display device 1 shown in Figure 9 may include at least some of the features of the display device 1 shown in Figure 2, and the same features will not be described again here.

[0147] In some embodiments, the first mounting wall 112 and the second mounting wall 113 may be arranged opposite to each other. The image source component 12 is mounted on the first mounting wall 112, the second mounting wall 113 is provided with a mounting opening 1131, the optical window 14 is mounted on the second mounting wall 113 and covers the mounting opening 1131, the imaging component 13 is located between the image source component 12 and the optical window 14, and the imaging component 13 is also used to project an image beam through the image source component 12 toward the optical window 14.

[0148] In this embodiment, the image beam emitted from the image source component 12 passes through the imaging component 13, is reflected sequentially at the optical window 14 and the imaging component 13, and then exits through the optical window 14. This increases the optical path length of the image beam within the housing 11, thereby increasing the size and distance of the virtual image. Furthermore, since the imaging component 13 is positioned between the optical window 14 and the image source component 12, the overall size of the display device 1 can be further reduced, achieving a miniaturized design. The optical architecture of this embodiment can be referred to as the Pancake optical architecture.

[0149] It should be noted that the dashed line with arrows in Figure 9 is a schematic diagram of the beam path of display device 1.

[0150] Please refer to Figures 9 and 10. Figure 10 is a schematic diagram of the structure of the bandpass film layer 15 in the imaging component 13 in some embodiments of the display device 1 shown in Figure 9.

[0151] In some embodiments, the bandpass film layer 15 may be disposed on the imaging component 13.

[0152] In this embodiment, a bandpass film layer 15 is disposed on the imaging component 13. After external visible light enters the housing space 111 through the optical window 14, the bandpass film layer 15 can filter the external visible light entering the housing space 111 to block light in non-light source matching bands. This reduces the amount of external visible light that passes through the imaging component 13 and the bandpass film layer 15 and is incident on the image source component 12, thereby reducing interference from external visible light on the image beam projected by the image source component 12 and preventing heat accumulation that could damage the image source component 12. Furthermore, by blocking light in non-light source matching bands through the bandpass film layer 15, the intensity of external visible light emitted through the optical window 14 in the housing space 111 can be reduced, thereby reducing glare reflectivity and improving display performance.

[0153] For example, the bandpass film layer 15 may be disposed on the side of the imaging component 13 facing the optical window 14, or on the side of the imaging component 13 facing the image source component 12.

[0154] It should be noted that in Figure 10, the bandpass film layer 15 is disposed on the side of the imaging component 13 facing the optical window 14, and the placement of the bandpass film layer 15 is not limited.

[0155] For example, the bandpass film 15 may have a light transmittance of 30% or more in the matching band of the light source. For instance, the light transmittance of the bandpass film 15 in the matching band of the light source may be 30%, or 35%, or 40%, or 45%, or 50%, or 55%, or 60%, or other values ​​greater than 30%.

[0156] In this embodiment, the transmittance of the bandpass film layer 15 for the light source matching band satisfies the above-mentioned relationship. This is beneficial for the bandpass film layer 15 to cut off light from the external visible light entering the housing space 111 that is not in the light source matching band, thereby reducing the amount of external visible light that passes through the imaging component 13 and the bandpass film layer 15 and is incident on the image source component 12. This reduces the interference of external visible light on the image beam projected by the image source component 12 and prevents heat accumulation from damaging the image source component 12 caused by external visible light incident on it. In addition, by cutting off light from the non-light source matching band by the bandpass film layer 15, the intensity of external visible light emitted from the housing space 111 through the optical window 14 can also be reduced, thereby reducing glare reflectivity and improving the display effect.

[0157] Please refer to Figure 11, which is a schematic diagram of the structure of the display device 1 in the vehicle 100 shown in Figure 1 in some other embodiments. It should be noted that the display device 1 shown in Figure 11 may include at least some of the features of the display devices 1 shown in Figures 2 and 9, and the same features will not be described again here.

[0158] In some embodiments, the imaging component 13 may be disposed between the image source component 12 and the optical window 14. The imaging component 13 may include an optical waveguide 131, a first grating 132, and a second grating 133. The first grating 132 and the second grating 133 are disposed on the side of the optical waveguide 131 facing the optical window 14, and the first grating 132 and the second grating 133 are spaced apart, with the first grating 132 being closer to the image source component 12 than the second grating 133. The area of ​​the optical waveguide 131 where the first grating 132 is disposed is the grating coupling region, and the area of ​​the optical waveguide 131 where the second grating 133 is disposed is the grating coupling out region. The image source component 12 projects an image beam onto the optical waveguide 131. The image beam is reflected in the grating coupling region and propagates inside the optical waveguide 131. The image beam propagating inside the optical waveguide 131 exits at the grating coupling out region and is emitted from the optical window 14 to form a display beam.

[0159] In this embodiment, since the imaging component 13 includes an optical waveguide 131, the image beam can undergo multiple reflections within the optical waveguide 131, significantly increasing the optical path of the image beam. This, in turn, increases the distance of the virtual image formed by the display beam, enabling the formation of a large-format virtual image at a distance. Furthermore, the optical waveguide 131, through its shape design, can guide the image beam, resulting in higher directional propagation of the image beam and less beam energy loss, which is beneficial for improving the display effect of the display device 1.

[0160] It should be noted that the dashed line with arrows in Figure 11 is a schematic diagram of the beam path of the display device 1.

[0161] For example, the optical window 14 may include a substrate 142, an absorption device 143 and an antireflective coating layer 144 stacked sequentially.

[0162] In this embodiment, since the optical waveguide 131 can increase the optical path of the image beam, there is no need to set a beam splitting film layer in the optical window 14. This design can reduce the energy loss of the image beam at the beam splitting film layer, which is beneficial to improving the display quality of the display device 1.

[0163] In some other embodiments, the optical window 14 may also include a beam-splitting film layer to further increase the optical path of the image beam within the display device 1, thereby further increasing the imaging distance and virtual image size.

[0164] It should be noted that Figure 11 shows the bandpass film layer 15 disposed on the optical window 14 for illustration, and does not limit the specific position of the bandpass film layer 15. In this embodiment, the arrangement of the bandpass film layer 15 can refer to the arrangement of the bandpass film layer 15 in Figures 3, 5, 7, 8 and 10, as long as the bandpass film layer 15 can be located on the path of forming the display beam.

[0165] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0166] It should be noted that all the above figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application.

[0167] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display device, characterized in that, Includes the housing, image source assembly, imaging assembly, optical window, and bandpass coating; The housing has a receiving space and a mounting port communicating with the receiving space. The image source component and the imaging component are both located in the receiving space and are mounted on the housing. The optical window is mounted on the mounting port. The image source component is used to project an image beam, which is reflected sequentially by the optical window and the imaging component and then emitted from the optical window to form a display beam, which is used to form a virtual image; The bandpass film layer is located on the path that forms the display beam; The visible light bands include light source matching bands and non-light source matching bands. The light source matching band is the band of the image beam. The transmittance of the bandpass film layer to the light source matching band is greater than that to the light source non-light source matching band.

2. The display device as claimed in claim 1, characterized in that, The bandpass film layer is disposed in the optical window.

3. The display device as claimed in claim 1, characterized in that, The bandpass film layer is disposed on the imaging component.

4. The display device as claimed in claim 2, characterized in that, The optical window includes a beam-splitting film, a substrate, and an absorption device stacked sequentially, with the bandpass film located on the side of the absorption device facing away from the substrate; The beam-splitting film layer is disposed on the side of the substrate facing the receiving space. The beam-splitting film layer is used to reflect the image beam projected by the image source component to the imaging component, and to transmit the image beam reflected by the imaging component. The absorption device includes at least one of a polarizing device and an absorption film.

5. The display device as claimed in claim 4, characterized in that, The bandpass film layer has a transmittance of 90% or more for the light source matching wavelength band.

6. The display device as claimed in claim 2, characterized in that, The optical window includes a beam-splitting film, a substrate, an absorption device, and an anti-reflection film layer stacked sequentially, with the bandpass film layer located between the absorption device and the substrate; The beam-splitting film layer is disposed on the side of the substrate facing the receiving space. The beam-splitting film layer is used to reflect the image beam projected by the image source component to the imaging component, and to transmit the image beam reflected by the imaging component. The absorption device includes at least one of a polarizing device and an absorption film; The transmittance of the antireflective coating to visible light is greater than or equal to a preset value.

7. The display device as claimed in claim 6, characterized in that, The bandpass membrane layer includes a membrane layer body and at least one metal membrane layer; The metal film is disposed on the side of the film body facing the substrate, and / or the metal film is disposed on the side of the film body away from the substrate, and / or the metal film is disposed within the film body.

8. The display device as claimed in claim 7, characterized in that, The material of the metal film includes at least one of nickel, chromium, tantalum, silver, gold, copper, zinc, aluminum, titanium, and their alloys.

9. The display device as claimed in any one of claims 6 to 8, characterized in that, The transmittance of the bandpass film to the light source matching band is in the range of 60% to 96%, the reflectance of the bandpass film to the light source matching band is in the range of 4% to 15%, and the absorption rate of the bandpass film to the light source matching band is in the range of 0% to 25%.

10. The display device as claimed in claim 2, characterized in that, The optical window includes a substrate, an absorption device, and an anti-reflection coating layer stacked sequentially. The bandpass film layer is disposed on the side of the substrate facing the receiving space. The bandpass film layer is used to reflect the image beam projected by the image source component to the imaging component, and to transmit the image beam reflected by the imaging component. The absorption device includes at least one of a polarizing device and an absorption film; The transmittance of the antireflective coating to visible light is greater than or equal to a preset value.

11. The display device as claimed in claim 10, characterized in that, The bandpass membrane layer includes a membrane layer body and at least one metal membrane layer; The metal film is disposed on the side of the film body facing the substrate, and / or the metal film is disposed on the side of the film body away from the substrate, and / or the metal film is disposed within the film body.

12. The display device as claimed in claim 10 or 11, characterized in that, The bandpass film has a light transmittance of 40% to 70% for the matching wavelength band of the light source, a light reflectance of 30% to 60% for the matching wavelength band of the light source, and a light absorption rate of 0% to 30% for the matching wavelength band of the light source.

13. The display device according to any one of claims 1 to 12, characterized in that, The housing includes a first mounting wall, a second mounting wall, and a third mounting wall, wherein the first mounting wall and the second mounting wall are disposed opposite to each other, and the third mounting wall and the second mounting wall are disposed opposite to each other. The image source component is mounted on the first mounting wall, the second mounting wall is provided with the mounting opening, the optical window is mounted on the second mounting wall and covers the mounting opening, and the imaging component is mounted on the third mounting wall.

14. The display device according to any one of claims 1 to 12, characterized in that, The housing includes a first mounting wall and a second mounting wall, wherein the first mounting wall and the second mounting wall are disposed opposite to each other. The image source component is mounted on the first mounting wall, the second mounting wall is provided with the mounting opening, the optical window is mounted on the second mounting wall and covers the mounting opening, and the imaging component is located between the image source component and the optical window; The imaging component is also used to project the image beam toward the optical window through the image source component.

15. The display device as claimed in claim 3, characterized in that, The imaging component is located between the image source component and the optical window, and the imaging component is also used to transmit the image beam projected toward the optical window through the image source component; The bandpass film layer is disposed on the side of the imaging component facing the optical window, or on the side of the imaging component facing the image source component.

16. The display device as claimed in claim 15, characterized in that, The bandpass film layer has a transmittance of 30% or more for the light source matching wavelength band.

17. The display device according to any one of claims 1 to 16, characterized in that, The material of the bandpass film includes at least two of magnesium fluoride, silicon oxide, silicon nitride, titanium oxide, and niobium oxide.

18. The display device as claimed in any one of claims 1 to 17, characterized in that, The transmittance of the bandpass film to the non-light source matching band is less than or equal to 20%.

19. The display device according to any one of claims 1 to 18, characterized in that, The visible light from outside the display device that is incident on the optical window is a first ray, the first ray having a first light intensity. The first ray enters the receiving space through the optical window and is emitted from the optical window to form a second ray. The light in the second ray that is not matched to the light source has a second light intensity. The ratio of the second light intensity to the first light intensity is less than or equal to 2%.

20. A cockpit, characterized in that, The display device includes any one of claims 1 to 19.

21. A means of transportation, characterized in that, It includes a vehicle and a display device as described in any one of claims 1 to 19, the display device being mounted on the vehicle, or it includes a cockpit as described in claim 20, the cockpit being mounted on the vehicle.

Images