CN220509164U - Dielectric film, windshield, display device and traffic equipment - Google Patents

Abstract

The application relates to a dielectric film, a windshield, a display device and traffic equipment. The dielectric film includes: at least one first dielectric layer; at least one second medium layer, the second medium layer and the first medium layer are alternately arranged, and the refractive index of the first medium layer is larger than that of the second medium layer; the dielectric film is configured to transmit at least a portion of visible light and reflect at least a portion of infrared light. The dielectric film has higher visible light transmission characteristic and higher infrared light reflection characteristic, ensures driving safety, and can reduce infrared light incident into traffic equipment so as to reduce the temperature in the traffic equipment.

Description

Dielectric film, windshield, display device and traffic equipment

Technical Field

The application relates to the technical field of head-up display, in particular to a dielectric film, a windshield, a display device and traffic equipment.

Background

The HUD (head up display) is also called head up display. Through projection of the light that the image source of HUD sent on imaging window (imaging plate of afterloading or the windscreen etc. of vehicle), the user need not the low head just can directly see the picture to can improve user experience. For example, in some cases, distraction caused by a driver looking down at the dashboard during driving can be avoided, so that driving safety factor is improved, and better driving experience can be brought.

Disclosure of Invention

Based on the problems, the application provides a dielectric film, a windshield, a display device and traffic equipment, and the safety of the traffic equipment is improved.

According to a first aspect of the present application, there is provided a dielectric film comprising: at least one first dielectric layer; at least one second medium layer, wherein the second medium layers and the first medium layers are alternately arranged, and the refractive index of the first medium layer is larger than that of the second medium layer; the dielectric film is configured to transmit at least a portion of visible light and reflect at least a portion of infrared light.

According to a second aspect of the present application there is provided a windscreen comprising: a first glass plate and a second glass plate; an intermediate layer disposed between the first glass plate and the second glass plate; the dielectric film is plated on the first glass plate; or the dielectric film is plated on the second glass plate; alternatively, the dielectric film is disposed within the interlayer.

According to a third aspect of the present application, there is provided a display device including: an image source configured to emit image light; a windscreen as described above, said windscreen being configured to transmit at least part of the visible light and reflect said image light.

According to a fourth aspect of the present application, there is provided a traffic device comprising: a windscreen as described above; or a display device as described above.

In some embodiments, the refractive index of the first dielectric layer is 1.6-2.6, and the refractive index of the second dielectric layer is 1.3-2.0; and/or the thickness of the first dielectric layer is 1-200mm, and the thickness of the second dielectric layer is 1-300mm.

In some embodiments, the material of the first dielectric layer is one or more of tantalum pentoxide, titanium dioxide, titanium pentoxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminum fluoride; and/or the material of the second dielectric layer is one or more of tantalum pentoxide, titanium dioxide, titanium pentoxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminum fluoride.

In some embodiments, the number of layers of the first dielectric layer is 1-25, and the number of layers of the second dielectric layer is 1-25; and/or the dielectric film is configured to transmit visible light in a wavelength range of 390nm to 740nm, have a reflectance of less than 4% for visible light, reflect infrared light in a wavelength range of 800nm to 2000nm, and have a reflectance of more than 2% for infrared light.

In some embodiments, the dielectric film further includes a smoothing layer, and the first dielectric layer and the second dielectric layer that are alternately arranged form a layer group, and the smoothing layer is disposed on one side of the layer group.

In some embodiments, the intermediate layer comprises a first intermediate layer and a second intermediate layer; the windshield also comprises a transparent substrate, wherein the dielectric film is plated on the transparent substrate, and the transparent substrate is arranged between the first intermediate layer and the second intermediate layer; and/or the windshield is a wedge-shaped windshield.

In some embodiments, the windshield further comprises a transflective film disposed on the first glass sheet; alternatively, the transflective film is disposed on the second glass plate; alternatively, the transflective film is disposed within the intermediate layer; the transflective film is configured to transmit at least a portion of visible light and reflect image light.

In some embodiments, the first glass sheet, the interlayer, and the second glass sheet are stacked in order from front to back, the dielectric film is disposed on a front surface of the first glass sheet, and the transflective film is disposed on a rear side of the dielectric film.

In some embodiments, the image light comprises first, second and third light components of different wavelengths, each of which comprises a spectral line or band having a half-width of less than or equal to 60nm, the first light component having a wavelength in the range 410nm to 480nm and/or the second light component having a wavelength in the range 500nm to 565nm and/or the third light component having a wavelength in the range 590nm to 690nm.

The medium film can transmit visible light and reflect infrared light, reduces the infrared light entering the traffic equipment while ensuring driving safety, is favorable for reducing temperature rise in the traffic equipment, and improves safety and user experience of the traffic equipment.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings by a person skilled in the art without departing from the scope of protection of the present application.

FIG. 1 is a schematic illustration of a dielectric film according to an embodiment of the present application;

FIG. 2 is a schematic view of a windshield according to an embodiment of the present application;

FIG. 3 is a schematic view of a windshield according to an embodiment of the present application;

FIG. 4 is a schematic view of a windshield according to an embodiment of the present application;

FIG. 5 is a schematic view of a windshield according to an embodiment of the present application;

FIG. 6 is a schematic view of a windshield according to an embodiment of the present application;

fig. 7 is a schematic diagram of a display device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application, taken in conjunction with the accompanying drawings, will clearly and fully describe the technical aspects of the present application, and it will be apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The inventors of the present application have found that windshields of traffic devices, for example windshields of vehicles, can transmit light from the outside environment. Part of external environment light is infrared light, and the infrared light incident into the traffic equipment can cause temperature rise in the traffic equipment, so that the service life and reliability of parts in the traffic equipment are influenced, and the driving experience of a user is influenced.

As shown in fig. 1, an embodiment of the present application provides a dielectric film 1, where the dielectric film 1 includes at least one first dielectric layer 11 and at least one second dielectric layer 12.

The first dielectric layer 11 is a high refractive index layer, the second dielectric layer 12 is a low refractive index layer, and the refractive index of the first dielectric layer 11 is larger than that of the second dielectric layer 12. The first dielectric layers 11 and the second dielectric layers 12 are alternately stacked in order from bottom to top. For example, the first dielectric layer 11 and the second dielectric layer 12 are two layers, and when in preparation, the first dielectric layer 11 is plated first, the first second dielectric layer 12 is plated on the first dielectric layer 11, the second first dielectric layer 11 is plated on the first second dielectric layer 12, and the second dielectric layer 12 is plated on the second first dielectric layer 11.

Optionally, the number of first dielectric layers 11 and the number of second dielectric layers 12 are multiple layers. When the number of the first dielectric layers 11 is plural, the refractive indices of the different first dielectric layers 11 may be the same or different. When the number of the second dielectric layers 12 is plural, the refractive indices of the different second dielectric layers 12 may be the same or different. The refractive index of the first dielectric layer 11 and the refractive index of the second dielectric layer 12 are set according to the need.

The dielectric film 1 is configured to transmit at least part of visible light and reflect at least part of infrared light. For example, the dielectric film 1 is configured to transmit at least 50% of visible light and reflect at least 10% of infrared light. Light entering the dielectric film 1 can be processed by the high refractive index of the first dielectric layer 11 and the low refractive index of the second dielectric layer 12, so that visible light transmission and infrared light reflection can be realized, and the required performance requirements can be met.

The dielectric film 1 of the present embodiment includes first dielectric layers 11 and second dielectric layers 12 alternately arranged, the refractive index of the first dielectric layers 11 being larger than the refractive index of the second dielectric layers 12, and the dielectric film 1 is configured to transmit at least part of visible light and reflect at least part of infrared light. When the medium film 1 is arranged on the wind shielding window, the transmission performance of the medium film 1 to visible light enables personnel (such as drivers) in traffic equipment to see the condition of the external environment clearly, and the driving safety is ensured. Meanwhile, the reflection performance of the medium film 1 on infrared light reduces the infrared light entering the traffic equipment, is favorable for reducing the temperature rise in the traffic equipment, improves the user experience, avoids the situation that the temperature rise of equipment in a traffic tool is too high (for example, a head-up display is arranged in the traffic equipment, and can avoid the too high temperature rise of the head-up display), and improves the safety of the traffic equipment.

Alternatively, the dielectric film 1 is formed by adopting a physical vapor deposition method for film coating or a chemical vapor deposition method for film coating. For example, the first dielectric layer 11 and the second dielectric layer 12 are alternately deposited using a sputter coating.

In some embodiments, the refractive index of the first dielectric layer 11 is 1.6-2.6, and the refractive index of the second dielectric layer 12 is 1.3-2.0. For example, the first dielectric layer 11 is a titanium pentoxide film, the refractive index of the first dielectric layer 11 is 2.4, the second dielectric layer 12 is a silicon dioxide film, and the refractive index of the second dielectric layer 12 is 1.47. The refractive index of the first dielectric layer 11 is set to be 1.6-2.6, and the refractive index of the second dielectric layer 12 is set to be 1.3-2.0, so that the transmission effect of the dielectric film 1 on visible light can be ensured, the reflection effect of the dielectric film 1 on infrared light can be ensured, meanwhile, the production and the manufacture of the dielectric film 1 can be facilitated, and the production process of the dielectric film 1 is simplified.

In some embodiments, the thickness of the first dielectric layer 11 is 1-200mm, alternatively, the thickness of the first dielectric layer 11 is 5-150mm, for example, the thickness of the first dielectric layer 11 is 5mm, 10mm, 20mm, 50mm, 100mm, or 150mm. The thickness of the second dielectric layer 12 is 1-300mm, alternatively the thickness of the second dielectric layer 12 is 10-260mm, for example, the thickness of the second dielectric layer 12 is 10mm, 20mm, 50mm, 100mm, 200mm or 260mm. The thickness of the first dielectric layer 11 or the thickness of the second dielectric layer 12 is too small, so that the processing is inconvenient, the uniformity of the film layer is poor, and the thickness of the first dielectric layer 11 or the thickness of the second dielectric layer 12 is too large, so that the material waste is caused. Therefore, the first dielectric layer 11 and the second dielectric layer 12 need to be designed to have appropriate thicknesses.

In some embodiments, the material of the first dielectric layer 11 is one or more of tantalum pentoxide, titanium dioxide, titanium pentoxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminum fluoride; and/or the number of the groups of groups,

the second dielectric layer 12 is made of one or more of tantalum pentoxide, titanium dioxide, titanium pentoxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride and aluminum fluoride.

The material of the first dielectric layer 11 and the material of the second dielectric layer 12 are selected according to the requirements, and the requirements of the dielectric film 1 on the transmission of visible light and the reflection of infrared light can be met.

When the number of the first dielectric layers 11 is multiple, the materials of the first dielectric layers 11 of different layers may be different, so that the first dielectric layers 11 of different layers have different refractive indexes. When the number of the second dielectric layers 12 is multiple, the materials of the two dielectric layers 12 of different layers may be different, so that the second dielectric layers 12 of different layers have different refractive indexes.

In some embodiments, the number of layers of the first dielectric layer 11 is 1-25, alternatively the number of layers of the first dielectric layer 11 is 5-15, alternatively the number of layers of the first dielectric layer 11 is 3 or 7. The number of layers of the second dielectric layer 12 is 1-25, alternatively the number of layers of the second dielectric layer 12 is 5-15, alternatively the number of layers of the second dielectric layer 12 is 4 or 7.

The number of the first dielectric layers 11 and the number of the second dielectric layers 12 may be equal or unequal. For example, the number of first dielectric layers 11 in one dielectric film 1 is 3, and the number of second dielectric layers 12 is 4. The number of the first dielectric layers 11 in the other dielectric film 1 is 7, and the number of the second dielectric layers 12 is 7. The total number of the film layers of the dielectric film 1 is more than or equal to 2, and the larger the total number of the film layers is, the better the infrared ray reflection effect of the dielectric film 1 is.

In some embodiments, the dielectric film 1 is configured to transmit visible light in a wavelength range of 390nm to 740nm, has a reflectance of less than 4% for visible light, reflects infrared light in a wavelength range of 800nm to 2000nm, and has a reflectance of more than 2% for infrared light, which is advantageous for improving the optical effect of the dielectric film 1. For example, the dielectric film 1 reflects infrared light in a wavelength range of 1000nm to 2000nm, and has a reflectance of 10% or more for infrared light.

For example, the total number of film layers of the dielectric film 1 is less than 10. For example, the material of the first dielectric layer 11 is titanium pentoxide, the number of layers of the first dielectric layer 11 is 4, the thickness of the thinnest layer in each first dielectric layer 11 is greater than 10nm, and the thickness of the thickest layer in each first dielectric layer 11 is less than 50nm. The second dielectric layers 12 are made of silicon dioxide, the number of layers of the second dielectric layers 12 is 5, the thickness of the thinnest layer in each second dielectric layer 12 is larger than 20nm, and the thickness of the thickest layer in each second dielectric layer 12 is smaller than 190nm. The first dielectric layers 11 and the second dielectric layers 12 are alternately arranged. The dielectric film 1 has a reflectance of not more than 4% for visible light in a wavelength range of 390nm to 740nm and a reflectance of not more than 0.5% for visible light in a wavelength range of 400nm to 477 nm. The dielectric film 1 has a reflectance of 2% or more for infrared light in a wavelength range of 800nm to 2000nm, a reflectance of 4% or more for infrared light in a wavelength range of 850nm to 2000nm, and a reflectance of 16% or more for infrared light in a wavelength range of 1200nm to 2000 nm.

In another embodiment, the total number of the dielectric layers is less than 20, for example, the material of the first dielectric layer 11 is titanium pentoxide, the number of the first dielectric layers 11 is 8, the thickness of the thinnest layer in each first dielectric layer 11 is greater than 10nm, and the thickness of the thickest layer in each first dielectric layer 11 is less than 120nm. The second dielectric layers 12 are made of silicon dioxide, the number of layers of the second dielectric layers 12 is 9, the thickness of the thinnest layer in each second dielectric layer 12 is larger than 30nm, and the thickness of the thickest layer in each second dielectric layer 12 is smaller than 260nm. The first dielectric layers 11 and the second dielectric layers 12 are alternately arranged. The dielectric film 1 has a reflectance of 2% or less with respect to visible light in a wavelength range of 390nm to 740 nm. The dielectric film has a reflectivity of 5% or more for infrared light in a wavelength range of 800nm to 2000nm, a reflectivity of 40% or more for infrared light in a wavelength range of 800nm to 1350nm and 1700nm to 1950nm, and a reflectivity of 70% or more for infrared light in a wavelength range of 850nm to 950nm and 1150nm to 1250 nm.

In some embodiments, the dielectric film 1 further comprises a smoothing layer 13. The first dielectric layers 11 and the second dielectric layers 12 which are alternately arranged form a layer group, and the smoothing layer 13 is arranged on one side of the whole layer group. The smoothness layer 13 is provided on one side of the layer group, so that the smoothness of the film layer of the dielectric film 1 can be improved, and the reflectance curve of the dielectric film 1 in a specific wavelength range can be smoother, for example, the reflectance of the dielectric film 1 in an infrared wavelength range can be controlled within a first reflectance threshold. Therefore, it is convenient to improve the optical performance of the dielectric film 1.

As shown in fig. 2, the embodiment of the present application further provides a windshield 100, where the windshield 100 is disposed on a traffic device and is capable of transmitting external visible light. The windshield 100 includes a first glass plate 2, an intermediate layer 3, and a second glass plate 4, which are disposed in this order from front to rear. An intermediate layer 3 is provided between the first glass plate 2 and the second glass plate 4, optionally the intermediate layer 3 being an adhesive layer.

The windshield 100 further includes a dielectric film 1 as described above, the dielectric film 1 being configured to transmit at least a portion of visible light and reflect at least a portion of infrared light. The medium film 1 not only ensures the driving safety, but also can reduce the infrared light entering the traffic equipment, and is beneficial to reducing the temperature rise in the traffic equipment.

In fig. 2, a dielectric film 1 is provided on the surface of a first glass plate 2 remote from an intermediate layer 3. For example, the dielectric film 1 is plated on the first glass plate 2 using the first glass plate 2 as a substrate. If necessary, the dielectric film 1 may be provided on the surface of the first glass plate 2 near the intermediate layer 3.

As shown in fig. 3, the dielectric film 1 may also be provided on the surface of the second glass plate 4 remote from the intermediate layer 3. For example, the dielectric film 1 is sputtered onto the second glass plate 4 using the second glass plate 4 as a substrate. If necessary, the dielectric film 1 may be provided on the surface of the second glass plate 4 near the intermediate layer 3.

As shown in fig. 4, the dielectric film 1 may also be provided in the intermediate layer 3. The dielectric film 1 is positioned in the intermediate layer 3, so that the effect of reflecting infrared light can be achieved, the dielectric film 1 is protected conveniently, and damage caused by scraping of the dielectric film is avoided. The dielectric film 1 also serves as a reinforcing film in the intermediate layer 3, and improves the strength of the intermediate layer 3, thereby improving the overall performance of the windshield 100.

In some embodiments, the intermediate layer 3 includes a first intermediate layer 31 and a second intermediate layer 32. The windshield 100 further includes a transparent substrate 5, the dielectric film 1 is plated on the transparent substrate 5, and the transparent substrate 5 is disposed between the first intermediate layer 31 and the second intermediate layer 32. The dielectric film 1 may be disposed on either side of the transparent substrate 5. For example, the first glass plate 2, the first interlayer 31, the transparent substrate 5, the dielectric film 1, the second interlayer 32, and the second glass plate 4 are disposed in this order from the front to the back.

In some embodiments, as shown in fig. 5, the windshield 100 is a wedge-shaped windshield. At least one of the first glass plate 2, the intermediate layer 3 and the second glass plate 4 has a wedge-shaped cross section, so that the entire cross section of the windshield 100 has a wedge-shaped cross section. For example, the cross sections of the first intermediate layer 31 and the second intermediate layer 32 are wedge-shaped, the upper ends of which are thicker, and the lower ends of which are thinner, the dielectric film 1 is plated on the transparent substrate 5, and the transparent substrate 5 is arranged between the first intermediate layer 31 and the second intermediate layer 32. The wedge-shaped windscreen 100 is advantageous for eliminating ghosting of the windscreen.

As shown in fig. 6, in some embodiments, the windshield 100 further includes a transflective film 6, the transflective film 6 being capable of transmitting a portion of light and reflecting another portion of light. For example, a head-up display is disposed in the traffic device, image light emitted from an image source of the head-up display is incident on the transflective film 6, and the transflective film 6 is configured to reflect the image light of the image source and transmit visible light in other bands than the image light. Therefore, the wind shielding window 100 is configured to receive the image light and reflect the image light into the eye box area, so as to form a virtual image visible to human eyes, and the wind shielding window 100 can be ensured to have higher transmittance to visible light, so that a user can see the condition outside the traffic equipment clearly, and the driving safety is improved.

It will be appreciated that the region where the observer needs to view the image, i.e. the eyebox region (eyebox), is preset according to the actual requirement, and the eyebox region refers to the region where the eyes of the observer can see the image of the image source, and may be a planar region or a stereoscopic region, for example.

Alternatively, the transflective film 6 is provided on the first glass plate 2, for example, the transflective film 6 is provided on a surface of the first glass plate 2 remote from the interlayer 3. Or the transflective film 6 is provided on the surface of the first glass plate 2 near the interlayer 3.

The transflective film 6 may be disposed in the intermediate layer 3, for example, the transflective film 6 may be disposed on the surface of the transparent substrate 5, and the transparent substrate 5 may be disposed between the first intermediate layer 31 and the second intermediate layer 32.

The transflective film 6 may also be provided on the second glass plate 4. For example, the transflective film 6 is provided on the surface of the second glass plate 4 that is remote from the interlayer 3. Or the transflective film 6 is provided on the surface of the second glass plate 4 near the interlayer 3.

The transflective film 6 may be a wavelength selective transflective film or a polarizing transflective film. It should be understood here that the reflectivity of the transflective film corresponds to the image light emitted by the image source. For example, the display screen of the image source emits S polarized light, and the transflective film reflects the S polarized light; or the display screen of the image source emits P polarized light, and the transflective film reflects the P polarized light; or the display screen of the image source emits S polarized light and P polarized light, and the transflective film reflects the S polarized light and the P polarized light.

In some embodiments, the first glass sheet 2, the interlayer 3, and the second glass sheet 4 are stacked sequentially from front to back. The dielectric film 1 is provided on the front surface of the first glass plate, and the transflective film 6 is provided on the rear side of the dielectric film 1, for example, the transflective film 6 is provided on the rear surface of the second glass plate 4. The dielectric film 1 is disposed on the front surface of the first glass plate, which is advantageous for the dielectric film 1 to reflect infrared light in external light.

As shown in fig. 7, the embodiment of the present application further provides a display device, and optionally, the display device is a head-up display device. The display device includes the windshield 100 and the image source 200 as described above, and the image source 200 is disposed on a side of the windshield 100 facing the vehicle interior. The image source 200 is configured to emit image light, the image light is incident on the windshield 100, and the windshield 200 is configured to transmit at least a portion of the visible light and reflect the image light. The windshield 200 reflects the image light to the eye box area 300, and the driver can view the image 400 in the eye box area 300 along the reverse extension direction of the image light, and the image 400 is a virtual image.

The head-up display device may include one or more reflective elements, which may be curved mirrors or flat mirrors, and at least one reflective element is a curved mirror; that is, the head-up display body may include one or more curved mirrors, or include one curved mirror and one flat mirror, or include one curved mirror and a plurality of flat mirrors, or the like. The curved mirror can be a free-form curved mirror, a spherical mirror, a hyperboloid mirror, a parabolic mirror and the like.

Alternatively, the image source 200 may emit light with a specific polarization characteristic, for example, an LCD (Liquid Crystal Display ) image source may emit linearly polarized light with a specific polarization direction, and a DLP (Digital Light Processing ) image source, a diffuser, and a backlight module may emit light with a specific polarization.

Alternatively, the image light emitted by the image source 200 may be a linearly polarized light of three colors of RGB, i.e. include three spectral bands, for example, the image light includes a first light component, a second light component, and a third light component with different wavelengths, where each of the first light component, the second light component, and the third light component includes a spectral line or spectral band with a half-peak width of less than or equal to 60nm, the first light component has a wavelength ranging from 410nm to 480nm, and/or the second light component has a wavelength ranging from 500nm to 565nm, and/or the third light component has a wavelength ranging from 590nm to 690nm. Therefore, the reflection rate of the image light in the selected wavelength range is improved, the imaging effect of the linearly polarized light is improved, the transmissivity of the external environment light is improved, and the user can clearly see the external environment.

The embodiment of the application also provides a traffic device, the traffic device comprising: a windscreen as described above; or a display device as described above. The traffic device may include, but is not limited to, land vehicles such as vehicles, air vehicles such as aircraft, or water or underwater vehicles.

The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and embodiments of the present application, and the description of the above examples is only used to help understand the technical solution and core ideas of the present application. Therefore, those skilled in the art will recognize that many modifications and adaptations of the present application are possible and can be accomplished with the aid of the teaching herein within the scope of the present application. In view of the foregoing, this description should not be construed as limiting the application.

Claims (11)

1. A dielectric film, comprising:

at least one first dielectric layer;

at least one second medium layer, wherein the second medium layers and the first medium layers are alternately arranged, and the refractive index of the first medium layer is larger than that of the second medium layer;

the dielectric film is configured to transmit at least a portion of visible light and reflect at least a portion of infrared light.

2. The dielectric film of claim 1, wherein the first dielectric layer has a refractive index of 1.6-2.6 and the second dielectric layer has a refractive index of 1.3-2.0; and/or the number of the groups of groups,

the thickness of the first dielectric layer is 1-200mm, and the thickness of the second dielectric layer is 1-300mm.

3. The dielectric film according to claim 1, wherein the number of layers of the first dielectric layer is 1-25, and the number of layers of the second dielectric layer is 1-25; and/or the number of the groups of groups,

the dielectric film is configured to transmit visible light in a wavelength range of 390nm to 740nm, have a reflectance of less than 4% for visible light, reflect infrared light in a wavelength range of 800nm to 2000nm, and have a reflectance of more than 2% for infrared light.

4. A dielectric film according to any one of claims 1 to 3, further comprising a smoothing layer, the alternating first and second dielectric layers forming a group of layers, the smoothing layer being disposed on one side of the group of layers.

5. A windshield, comprising:

a first glass plate and a second glass plate;

an intermediate layer disposed between the first glass plate and the second glass plate;

the dielectric film of any one of claims 1-4, the dielectric film being plated to the first glass sheet; or,

the dielectric film is plated on the second glass plate; or,

the dielectric film is disposed within the intermediate layer.

6. The windshield of claim 5, wherein the intermediate layer comprises a first intermediate layer and a second intermediate layer;

the windshield also comprises a transparent substrate, wherein the dielectric film is plated on the transparent substrate, and the transparent substrate is arranged between the first intermediate layer and the second intermediate layer; and/or the number of the groups of groups,

the wind shielding window is a wedge-shaped windshield glass.

7. The windshield of any of claims 5-6, further comprising a transflective film disposed on the first glass sheet; or,

the transflective film is arranged on the second glass plate; or,

the transflective film is arranged in the middle layer;

the transflective film is configured to transmit at least a portion of visible light and reflect image light.

8. The window according to claim 7, wherein the first glass plate, the intermediate layer, and the second glass plate are stacked in this order from front to back, the dielectric film is provided on a front surface of the first glass plate, and the transflective film is provided on a rear side of the dielectric film.

9. A display device, comprising:

an image source configured to emit image light;

the windshield of any of claims 5-8, configured to transmit at least a portion of visible light and reflect the image light.

10. The display device according to claim 9, wherein the image light includes first, second and third light components having different wavelengths, each of the first, second and third light components including a spectral line or band having a half-width of 60nm or less, the first light component having a wavelength ranging from 410nm to 480nm, and/or the second light component having a wavelength ranging from 500nm to 565nm, and/or the third light component having a wavelength ranging from 590nm to 690nm.

11. A traffic device, comprising:

a wind shield according to any one of claims 5 to 8; or,

a display device as claimed in claim 9 or 10.