CN117805956A

CN117805956A - S-polarized light transreflective film, wind shield window, display device and traffic equipment

Info

Publication number: CN117805956A
Application number: CN202211175744.8A
Authority: CN
Inventors: 吴慧军; 徐俊峰
Original assignee: Futurus Technology Co Ltd
Current assignee: Futurus Technology Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2024-04-02

Abstract

The present disclosure provides an S-polarized light transreflective film, a windshield, a display device, and a traffic device. The S-polarized light transreflective film comprises: at least one first layer and at least one second layer which are alternately arranged, wherein the refractive index of the first layer is larger than that of the second layer, and the number of layers of the first layer is smaller than or equal to that of the second layer; the S-polarized light transreflective film is configured to reflect S-polarized light at a first angular range relative to the normal and to transmit ambient light at a second angular range relative to the normal, the S-polarized light transreflective film having a reflectivity for the first S-polarized light greater than or equal to a first preset value and a reflectivity for light other than the first S-polarized light in the visible band that is at least 5% lower than the reflectivity for the first S-polarized light, wherein the first S-polarized light comprises at least one spectral line or band having a half-peak width less than or equal to 60 nm.

Description

S-polarized light transreflective film, wind shield window, display device and traffic equipment

Technical Field

The disclosure relates to the technical field of head-up display, and in particular relates to an S-polarized light transreflective film, a wind shield window, 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

One technical problem solved by the present disclosure is: how to improve the optical effect of the transflective film.

According to one aspect of the present disclosure, there is provided an S-polarized light transreflective film comprising: at least one first layer and at least one second layer which are alternately arranged, wherein the refractive index of the first layer is larger than that of the second layer, and the number of layers of the first layer is smaller than or equal to that of the second layer; the S-polarized light transreflective film is configured to reflect S-polarized light at a first angular range relative to a normal and to transmit ambient light at a second angular range relative to the normal, the S-polarized light transreflective film having a reflectivity of greater than or equal to a first preset value for a first S-polarized light and a reflectivity of at least 5% lower than a reflectivity of the first S-polarized light for light other than the first S-polarized light in a visible light band, wherein the first S-polarized light comprises at least one spectral line or band having a half-peak width of less than or equal to 60 nm.

According to another aspect of the present disclosure, there is provided a windshield comprising: a transparent substrate; the first antireflection film is positioned on the first side of the transparent substrate; the first protective film is positioned on one side of the first antireflection film, which is far away from the transparent substrate; and a transflective film positioned on a side of the first anti-reflection film away from the first protective film, wherein the transflective film is an S-polarized light transflective film as described above.

According to another aspect of the present disclosure, there is provided a display apparatus including: an image source configured to emit S polarized light; and a windshield as previously described configured to reflect S polarized light emitted by the image source and transmit ambient light.

According to another aspect of the present disclosure, there is provided a traffic device comprising: a display device as hereinbefore described.

In some embodiments, the first preset value is greater than or equal to 50%.

In some embodiments, the refractive index n of the first layer ₁ In the range of 1.8<n ₁ Not more than 2.3, the refractive index n of the second layer ₂ In the range of 1.2.ltoreq.n ₂ ≤1.8。

In some embodiments, the refractive index n of the first layer ₁ In the range of 1.9.ltoreq.n ₁ 2.2 or less, the refractive index n of the second layer ₂ In the range of 1.3.ltoreq.n ₂ ≤1.6。

In some embodiments, the number of layers of the first layer is less than or equal to 50; and/or the thickness of the first layer ranges from 1nm to 200nm, and the thickness of the second layer ranges from 1nm to 200nm; and/or the material of the first layer comprises an inorganic metal compound and the material of the second layer comprises an inorganic oxide.

In some embodiments, the first angle range is 30 degrees to 89 degrees and the second angle range is 30 degrees to 80 degrees; and/or the S-polarized light transreflective film has an average transmittance of greater than 60% for P-polarized light in the visible light range over the second angular range; and/or the first S-polarized light comprises at least a first light component, a second light component and a third light component having different wavelengths, each of the first light component, the second light component and the third light component comprising a spectral line or band having a half-peak width of less than or equal to 60 nm: 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.

In some embodiments, the transflective film is positioned on a second side of the transparent substrate, the second side being opposite the first side; alternatively, the transflective film is located between the first anti-reflection film and the transparent substrate.

In some embodiments, the first anti-reflection film includes at least one third layer and at least one fourth layer alternately arranged, the third layer having a refractive index greater than the fourth layer, the third layer having a number of layers equal to the number of layers of the fourth layer.

In some embodiments, the refractive index n of the third layer ₃ In the range of 2.ltoreq.n ₃ Not more than 2.5, the refractive index n of the fourth layer ₄ In the range of 1.2.ltoreq.n ₄ ≤1.7。

In some embodiments, the refractive index n of the third layer ₃ In the range of 2.1.ltoreq.n ₃ Not more than 2.3, the refractive index n of the fourth layer ₄ In the range of 1.3.ltoreq.n ₄ ≤1.6。

In some embodiments, the number of layers of the third layer is less than or equal to 10; and/or the thickness of the third layer ranges from 10nm to 150nm, and the thickness of the fourth layer ranges from 10nm to 150nm; and/or the material of the third layer comprises an inorganic metal compound and the material of the fourth layer comprises an inorganic oxide.

In some embodiments, the first antireflection film includes at least one third layer and at least one fourth layer alternately disposed, the third layer having a refractive index greater than the fourth layer, the second layer and the fourth layer being the same material layer.

In some embodiments, the transparent substrate includes: a plurality of sub-transparent substrates stacked; and an intermediate layer disposed between each two adjacent sub-transparent substrates of the plurality of sub-transparent substrates, wherein the transflective film is located between one sub-transparent substrate of the plurality of sub-transparent substrates and the intermediate layer, and the intermediate layer is a thermoplastic polymer film.

In some embodiments, the plurality of sub-transparent substrates is two sub-transparent substrates comprising: the first sub-transparent substrate is far away from the first antireflection film compared with the second sub-transparent substrate, the thickness of the first sub-transparent substrate is smaller than that of the second sub-transparent substrate, and/or at least one of the first sub-transparent substrate, the second sub-transparent substrate and the intermediate layer is wedge-shaped.

In some embodiments, the transflective film is attached to or plated on a surface of the transparent substrate, and the first protective film is attached to or plated on a surface of the first anti-reflective film; and/or the first side of the transparent substrate is the outer side of the transparent substrate, and the second side of the transparent substrate is the inner side of the transparent substrate; and/or, the windshield further comprises: the second antireflection film is positioned on one side of the transparent substrate far away from the first antireflection film; the transflective film is positioned on the second side of the transparent substrate, and the transflective film is positioned between the transparent substrate and the second anti-reflection film.

In some embodiments, the windshield further comprises: the second antireflection film is positioned on one side of the transparent substrate far away from the first antireflection film; and a second protective film located at a side of the second antireflection film away from the transparent substrate.

In some embodiments, the first protective film and the second protective film are anti-fingerprint films or hardened films, respectively; and/or the thickness of the first protective film and the thickness of the second protective film are less than or equal to 50nm; and/or, the range of refractive index of the first protective film and the range of refractive index of the second protective film are each 1.3 to 1.5.

In some embodiments, the ratio of the refractive index of the first anti-reflection film to the refractive index of the first protective film is greater than or equal to 0.8 and less than or equal to 1.2.

The structure and the parameters of the S-polarized light transreflective film can improve the optical effect of the transreflective film, and can facilitate the production and the processing of the transreflective film, thereby realizing batch production.

Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view illustrating a windshield according to one embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 8 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure;

FIG. 9 is a schematic cross-sectional view illustrating a transflector film according to one embodiment of the disclosure;

FIG. 10 is a schematic cross-sectional view illustrating an anti-reflection film according to one embodiment of the present disclosure;

fig. 11 is a schematic diagram illustrating a structure of a display device according to an embodiment of the present disclosure.

It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this disclosure, when a particular element is described as being located between a first element and a second element, there may or may not be intervening elements between the particular element and the first element or the second element. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without intervening components, or may be directly connected to the other components without intervening components.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

The inventors of the present disclosure found that the optical effect of the transflective film in the related art is poor.

In view of this, the present disclosure provides an S-polarized light transreflective film to improve optical effects.

Fig. 9 is a schematic cross-sectional view illustrating a transflective film according to one embodiment of the present disclosure. For example, the transflective film 2 is an S-polarized light transflective film. For example, the S-polarized light transreflective film is a transparent nanofilm.

It is understood herein that the S-polarized light transreflective film is configured to have a higher reflectivity for S-polarized light than for P-polarized light.

The S-polarized light transreflective film comprises: at least one first layer (which may also be referred to as a high refractive index layer) and at least one second layer (which may also be referred to as a low refractive index layer) are alternately arranged. The refractive index of the first layer is greater than the refractive index of the second layer. The number of layers of the first layer is less than or equal to the number of layers of the second layer. For example, as shown in fig. 9, the S-polarized light transreflective film 2 includes two first layers and second layers alternately arranged, for example, a first layer 211, a second layer 221, a first layer 212, and a second layer 222, which are sequentially stacked. The refractive index of the first layers 211 and 212 is greater than the refractive index of the second layers 221 and 222. In order to distinguish between the different refractive index layers, the first layer 211 is referred to herein as a first high refractive index layer 211, the second layer 221 is referred to as a first low refractive index layer 221, the first layer 212 is referred to as a second high refractive index layer 212, and the second layer 222 is referred to as a second low refractive index layer 222.

In the case where the S-polarized light transreflective film includes a plurality of first layers, the refractive indices of the plurality of first layers may be all the same, or partially the same, or completely different. For example, the refractive indices of the first high refractive index layer 211 and the second high refractive index layer 212 may be the same or different. Similarly, in the case where the S-polarized light transreflective film includes a plurality of second layers, the refractive indices of the plurality of second layers may be all the same, or partially the same, or completely different. For example, the refractive index of the first low refractive index layer 221 and the second low refractive index layer 222 may be the same or different.

The S-polarized light transreflective film is configured to reflect S-polarized light at a first range of angles relative to normal and to transmit ambient light at a second range of angles relative to normal. The S-polarized light transreflective film has a reflectivity of greater than or equal to a first preset value for the first S-polarized light, and a reflectivity of at least 5% lower than a reflectivity of the first S-polarized light for light other than the first S-polarized light in a visible light band. For example, the first preset value is greater than or equal to 50%. The first S-polarized light includes at least one spectral line or band having a half-width less than or equal to 60nm (nanometers). For example, the wavelength of the first S-polarized light includes at least one spectral line or band having a half-width of less than or equal to 60 nm.

It is understood that "light in the visible light band other than the first S-polarized light" includes other S-polarized light and P-polarized light than the first S-polarized light among the S-polarized light.

Thus, an S-polarized light transreflective film is provided. The S-polarized light transreflective film includes: at least one first layer and at least one second layer which are alternately arranged, wherein the refractive index of the first layer is larger than that of the second layer, and the number of layers of the first layer is smaller than or equal to that of the second layer; the S-polarized light transreflective film is configured to reflect S-polarized light at a first angular range relative to the normal and to transmit ambient light at a second angular range relative to the normal, the S-polarized light transreflective film having a reflectivity for the first S-polarized light greater than or equal to a first preset value and a reflectivity for light other than the first S-polarized light in the visible band that is at least 5% lower than the reflectivity for the first S-polarized light, wherein the first S-polarized light comprises at least one spectral line or band having a half-peak width less than or equal to 60 nm. The structure and parameters of the S-polarized light transreflective film can improve the optical effect of the transreflective film, for example, the reflectivity of the S-polarized light transreflective film to S-polarized light can be improved, the total transmissivity of the S-polarized light transreflective film to visible light wave band rays can be improved, the display imaging of a virtual image formed by image rays with S-polarized light and the display imaging of ambient light can be facilitated for a user to watch the image rays with S-polarized light at the same time, and the brightness requirement on an image source emitting the image rays can be reduced. In addition, the design and the processing of the transparent and reflective film can be facilitated, the mass production of the transparent and reflective film is realized, and the production cost is reduced.

It should be noted that, although fig. 9 shows a laminated structure of two first layers/second layers, those skilled in the art will understand that the scope of the present disclosure is not limited thereto. For example, the transflective film may be arranged according to actual needs such that the transflective film comprises a laminate of one, two, three or even more first/second layers. That is, the transflective film may include at least one first layer and at least one second layer that are alternately stacked.

In some embodiments, refractive index n of first layers 211 and 212 ₁ In the range of 1.8<n ₁ Refractive index n of second layers 221 and 222. Ltoreq.2.3 ₂ In the range of 1.2.ltoreq.n ₂ Less than or equal to 1.8. By adopting such refractive indexes, the first layer and the second layer can achieve a relatively good optical effect, and the reflectivity of the S-polarized light transreflective film to S-polarized light is improved.

In some embodiments, refractive index n of first layers 211 and 212 ₁ In the range of 1.9.ltoreq.n ₁ Refractive index n of second layers 221 and 222. Ltoreq.2.2 ₂ In the range of 1.3.ltoreq.n ₂ Less than or equal to 1.6. The inventors of the present disclosure found that by employing such refractive indices for the first layer and the second layer, a better optical effect can be further achieved.

It should be noted that, for a certain first layer, the refractive index of the entire first layer may be the same refractive index, or the first layer may include a plurality of portions (may be referred to as a first portion) whose refractive indices are different; for a certain second layer, the refractive index of the entire second layer may be the same refractive index, or the second layer may include a plurality of portions (which may be referred to as second portions) that differ in refractive index.

It should be further noted that the first layers in different layers may have the same refractive index or may have different refractive indexes; the second layers in different layers may have the same refractive index or may have different refractive indices. For example, all first layers are the same material layers and all second layers are the same material layers. It is understood herein that the same material layer refers to a material layer having the same molecular formula.

In some embodiments, the number of layers of the first layer is less than or equal to 50. Through setting for the number of piles of first layer, be convenient for reduce the whole number of piles of first layer and second layer in the S polarization light transmission and reflection membrane, the production and processing of the S polarization light transmission and reflection membrane of being convenient for improves production efficiency, is convenient for improve the holistic rete degree of consistency of S polarization light transmission and reflection membrane, improves optical effect.

In some embodiments, the first layer has a thickness in the range of 1nm to 200nm and the second layer has a thickness in the range of 1nm to 200nm. Therefore, the proper thickness range of the first layer can be selected, the first layer is prevented from being too thin to be convenient to process, and the accuracy of the first layer thickness can be improved; avoiding that the thickness of the first layer is too thick resulting in poor uniformity of each layer.

For example, the first layer has a thickness of 5nm to 125nm and the second layer has a thickness of 20nm to 195nm.

For another example, the thickness of the first high refractive index layer 211 is 5nm to 35nm, the thickness of the first low refractive index layer 221 is 5nm to 35nm, the thickness of the second high refractive index layer 212 is 20nm to 50nm, and the thickness of the second low refractive index layer 222 is 80nm to 130nm.

It should be noted that, in the description of the present disclosure, when a range describing a certain parameter is a to B, it is indicated that the parameter includes both endpoints of the range, i.e., a and B. For example, the thickness of the first layer ranges from 1nm to 200nm, and the thickness of the first layer may be 1nm or 200nm. The description of the ranges of other parameters is similar and will not be repeated here.

In some embodiments, the material of the first layer comprises an inorganic metal compound and the material of the second layer comprises an inorganic oxide.

In some embodiments, the first angle range is 30 degrees to 89 degrees and the second angle range is 30 degrees to 80 degrees. In such a first and second angular range, the transflective film may better achieve reflection of S-polarized light and transmission of ambient light, thereby achieving higher reflectivity and transmissivity.

In some embodiments, the S-polarized light transreflective film has an average transmission of greater than 60% for P-polarized light in the visible light range over the second angular range. Thus, the transmissivity of the S-polarized light transreflective film to the P-polarized light is conveniently improved, and the overall transmissivity to visible light is improved.

In some embodiments, the first S-polarized light includes at least a first light component, a second light component, and a third light component that differ in wavelength. The first, second and third light components each comprise a spectral line or band having a half-peak width of less than or equal to 60 nm. For example, the first light component has a wavelength ranging from 410nm to 480nm. For example, the second light component has a wavelength in the range of 500nm to 565nm. For example, the wavelength of the third light component may have a value in the range 590nm to 690nm. This facilitates an improved imaging of the first S-polarized light.

In some embodiments, the material of the S-polarized light transreflective film comprises: tantalum pentoxide (Ta) ₂ O ₅ ) Titanium dioxide (TiO) ₂ ) Magnesium fluoride (MgF) ₂ ) Silicon dioxide (SiO) ₂ ) Silicon nitride (SiN), silicon oxynitride (SiNO), or the like, or mixtures thereof.

In some embodiments, the first and second layers may be formed by plating using physical vapor deposition (e.g., evaporation, sputtering, etc.) methods known to those skilled in the art or by deposition using chemical vapor deposition methods. Preferably, the first layer and the second layer are formed by adopting a horizontal magnetron sputtering coating mode.

For example, the manufacturing process of the first layer and the second layer includes: after pretreatment, cleaning and other procedures, the original glass sheet (for example, the glass sheet can be used as a transparent substrate) of the glass plate enters a sputtering coating production line provided with a plurality of coating cathodes, and each film layer is sequentially deposited according to the laminated structure of the first layer/the second layer and the thickness design thereof; carrying out operations such as high-temperature forming, lamination and the like after coating is finished; the low surface energy film layer may then be applied to the surface of the first layer/second layer laminate prior to or after lamination, which may include surface cleaning, coating (e.g., spray, dip or paint, etc.), drying, and the like.

Thus far, S-polarized light transreflective films according to some embodiments of the present disclosure have been described.

The inventors of the present disclosure have studied and found that a front windshield of a vehicle is a laminated glass composed of at least two glass substrates having a certain curvature and an intermediate layer interposed between the different glass substrates. Light emitted by a projection light source of the head-up display system is reflected when passing through two surfaces of the laminated glass, which are contacted with air, and reflected images on the two surfaces are offset to form two double images which interfere with each other. Therefore, the refractive index of the glass-air interface of the windshield is greatly changed, and thus, reflection of the source light is likely to occur, which causes a ghost problem.

In view of this, embodiments of the present disclosure provide a windshield to reduce the occurrence of ghost images in the windshield.

Fig. 1 is a schematic cross-sectional view illustrating a windshield according to one embodiment of the present disclosure.

As shown in fig. 1, the windshield includes: a transparent substrate 1, a first Anti-reflection (AR) film 31, a first protective film 41, and a transflective film 2. In embodiments of the present disclosure, the anti-reflection film can increase light transmittance. The first antireflection film 31 is located on the first side of the transparent substrate 1. The first antireflection film 31 is located on the surface of the transparent substrate 1. The first protective film 41 is located on the side of the first antireflection film 31 remote from the transparent substrate 1. The transflective film 2 is located on the side of the first antireflection film 31 that is away from the first protective film 41. For example, as shown in fig. 1, the transflective film 2 is positioned on a second side of the transparent substrate 1, which is opposite to the first side. That is, in this example, the transflective film 2 is located on the side of the transparent substrate 1 away from the first antireflection film 31. For example, the transflective film 2 is located on the surface of the transparent substrate 1.

Here, the transflective film refers to a film layer that reflects a part of light and transmits another part of light. For example, the transflective film 2 is an S-polarized light transflective film as described above.

In some embodiments, the first side of the transparent substrate 1 is the outside of the transparent substrate and the second side of the transparent substrate 1 is the inside of the transparent substrate.

The "outer side" and "inner side" herein may be relative to the position of the image source of the head-up display, or may be relative to the transparent substrate as the windshield of the vehicle. For example, the image source is located on the right side of the transparent substrate (not shown in fig. 1), and the right side of the transparent substrate is the inner side of the transparent substrate, and the left side of the transparent substrate is the outer side of the transparent substrate. For another example, after the transparent substrate is mounted on the vehicle as a windshield, the right side of the transparent substrate is the inside of the vehicle, that is, the inside of the transparent substrate, and the left side of the transparent substrate is the outside of the vehicle, that is, the outside of the transparent substrate. For example, in the drawings of the embodiments of the present disclosure, the right side of the transparent substrate may be taken as the inner side of the transparent substrate, and the left side of the transparent substrate may be taken as the outer side of the transparent substrate. Of course, those skilled in the art will appreciate that this is merely exemplary and the scope of the present disclosure is not limited in this respect.

In some embodiments, the transflective film is affixed or plated on the surface of the transparent substrate. That is, the transflective film may be provided on the transparent substrate by means of a film-sticking or film-plating. The first anti-reflection film can be arranged on the outermost surface of the transparent substrate in a film plating or film pasting mode. The first protective film is adhered or plated on the surface of the first antireflection film. That is, the first protective film may be provided on the surface of the first antireflection film by means of a plating film or a sticking film.

To this end, there is provided a windshield according to some embodiments of the present disclosure, the windshield comprising: a transparent substrate; the first antireflection film is positioned on the first side of the transparent substrate; the first protective film is positioned on one side of the first antireflection film, which is far away from the transparent substrate; and the transflective film is positioned on one side of the first antireflection film away from the first protective film. The transflective film is an S-polarized light transflective film as previously described. In the embodiment, the transflective film is arranged on the inner side surface of the transparent substrate, so that the reflection effect of the image light emitted by the image source can be improved, and the transmission of the external light can be realized; the first anti-reflection film is arranged on the outer side surface of the transparent substrate, and can increase the transmittance, buffer the refractive index between glass and air interfaces and reduce the situation that double images are formed due to reflection. Therefore, the reflection of the image light of the image source on the surface of the windshield is increased, the brightness requirement on the image source is reduced, the condition that the windshield is subjected to double image can be reduced, a better visual effect can be obtained, and the cost is reduced. For example, reducing ghost images can improve the display effect of the screen and improve the safety of driving the vehicle. In addition, the first protective film can protect the first antireflection film, so that the first antireflection film is prevented from being polluted by stains or scratched by a sharp tool, and the service life and the working reliability of the first antireflection film are conveniently improved.

In some embodiments, the first protective film 41 is an Anti-fingerprint (AF) film or a hardened film. The AF film may play a role in oleophobic, hydrophobic, scratch-resistant, etc., and thus may play a role in protecting the first antireflection film 31. The outer surface of the wind shield window is difficult to be stained with fingerprints or other dirt, the effects of water resistance, oil resistance and dust resistance are achieved, and the outer surface is kept clean.

In some embodiments, the thickness of the first protective film is less than or equal to 50 nanometers. For example, the thickness of the first protective film may be less than or equal to 10 nanometers. Illustratively, the first protective film has a thickness of less than or equal to 5 nanometers. For example, the thickness of the first protective film is 2 nm to 3 nm. The thickness of the first protective film is smaller, and the optical performance of the first antireflection film is not basically affected.

Fig. 2 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure.

Similar to the windshield shown in fig. 1, the windshield shown in fig. 2 also includes a transparent substrate 1, a first antireflection film 31, a first protective film 41, and a transflective film 2.

In some embodiments, as shown in fig. 2, the windshield further includes a second anti-reflection film 32. The second antireflection film 32 is located on the side of the transparent substrate 1 away from the first antireflection film 31. Specifically, the second antireflection film 32 is located on the surface of the side of the transflective film 2 away from the transparent substrate 1. In other words, the transflective film 2 is located on the second side of the transparent substrate 1, and the transflective film 2 is located between the transparent substrate 1 and the second anti-reflective film 32. By providing the second antireflection film, the transmittance of the image light can be further increased, the loss of the image light of the image source (located on the inner side (e.g., right side) of the transparent substrate, not shown in fig. 2) can be reduced, and more image light can reach the position of the antireflection film 2.

In some embodiments, as shown in fig. 2, the windshield further includes a second protective film 42. The second protective film 42 is located on the side of the second antireflection film 32 away from the transparent substrate 1. The second protective film 42 is on the surface of the second antireflection film 32. For example, the second protective film 42 is an anti-fingerprint film or a hardened film. The second protective film has oleophobic, hydrophobic and scratch-resistant properties, and can play a role in protecting the second antireflection film.

In some embodiments, the thickness of the second protective film is less than or equal to 50 nanometers. For example, the thickness of the second protective film is less than or equal to 10 nanometers. Illustratively, the second protective film has a thickness of less than or equal to 5 nanometers. For example, the thickness of the second protective film is 2 nm to 3 nm. The second protective film has smaller thickness and basically does not influence the function of the second antireflection film.

Fig. 3 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure.

As shown in fig. 3, the windshield includes: a transparent substrate 1, a first antireflection film 31, a first protective film 41, and a transflective film 2. The first antireflection film 31 is located on the first side of the transparent substrate 1. The first antireflection film 31 is located on the surface of the transparent substrate 1. The first protective film 41 is located on the side of the first antireflection film 31 remote from the transparent substrate 1. The transflective film 2 is located on the side of the first antireflection film 31 that is away from the first protective film 41. The first protective film 41 has been described in detail previously, and will not be described again here.

In some embodiments, the transparent substrate 1 includes: a plurality of sub-transparent substrates (e.g., glass substrates) are stacked. For example, as shown in fig. 3, the plurality of sub-transparent substrates are two sub-transparent substrates, and the two sub-transparent substrates include: a first sub-transparent substrate 11 and a second sub-transparent substrate 12, wherein the first sub-transparent substrate 11 is farther from the first antireflection film 31 than the second sub-transparent substrate 12. Here, the first sub-transparent substrate 11 may also be referred to as an inner sub-transparent substrate, and the second sub-transparent substrate 12 may also be referred to as an outer sub-transparent substrate.

It should be noted that although fig. 3 shows that the transparent substrate 1 includes two sub-transparent substrates 11 and 12, the scope of the present disclosure is not limited thereto. For example, the transparent substrate 1 may also include more sub-transparent substrates, for example, three sub-transparent substrates, four sub-transparent substrates, and so on.

In some embodiments, the transparent substrate 1 further comprises an intermediate layer 13. The intermediate layer 13 is disposed between each two adjacent sub-transparent substrates of the plurality of sub-transparent substrates. For example, as shown in fig. 3, the transparent substrate 1 further includes an intermediate layer 13 between the first sub-transparent substrate 11 and the second sub-transparent substrate 12. For example, the intermediate layer 13 is a thermoplastic polymer film sheet (e.g., polyvinyl butyral, abbreviated as PVB).

Of course, those skilled in the art will appreciate that where the transparent substrate includes more (e.g., three, four, etc.) sub-transparent substrates, the transparent substrate includes more intermediate layers. For example, in the case where the transparent substrate includes three sub-transparent substrates, the transparent substrate includes two intermediate layers, wherein each intermediate layer is disposed between every two adjacent sub-transparent substrates. For another example, in the case where the transparent substrate includes four sub-transparent substrates, the transparent substrate includes three intermediate layers, wherein each intermediate layer is disposed between every two adjacent sub-transparent substrates. Thus, in an embodiment of the present disclosure, the transparent substrate comprises at least one intermediate layer.

In the above embodiments, the transparent substrate is a composite transparent substrate, such as a composite glass plate.

In some embodiments, the transflective film is positioned between one of the plurality of sub-transparent substrates and the intermediate layer. For example, as shown in fig. 3, the transflective film 2 is located between the second sub transparent substrate 12 and the intermediate layer 13. In this embodiment, the transflective film is disposed inside the transparent substrate, is easy to process and mold in terms of process realization, and can prevent the transflective film from being scratched, stained with dirt, or the like.

In addition, in the above description, the transflective film is located between one sub-transparent substrate and an intermediate layer, which may be an intermediate layer adjacent to the one sub-transparent substrate, for example, one of two intermediate layers adjacent to the one sub-transparent substrate.

In some embodiments, the transflective film is located on a surface of the one sub-transparent substrate. For example, the transflective film 2 is located on the surface of the second sub transparent substrate 12.

Fig. 4 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure. Unlike the windshield shown in fig. 3, in the windshield shown in fig. 4, the transflective film 2 is located between the first sub transparent substrate 11 and the intermediate layer 13. For example, the transflective film 2 is located on the surface of the first sub transparent substrate 11. As can also be seen from fig. 4, the transflective film 2 is located on the side of the first antireflection film 31 that is remote from the first protective film 41.

In an embodiment of the present disclosure, the surfaces of the first and second sub-transparent substrates are sequentially referred to as a first surface, a second surface, a third surface, and a fourth surface from inside to outside (e.g., from right to left). The transflective film is disposed on the third surface of the second sub-transparent substrate 12 or the second surface of the first sub-transparent substrate 11. Alternatively, the transflective film may be disposed on one of two opposite surfaces of the adjacent two sub-transparent substrates.

In some embodiments, the transflective film 2 may be disposed between the sub-transparent substrate and the intermediate layer by way of a film or coating; the first antireflection film 31 is disposed on the outermost surface of the transparent substrate 1 by means of a plating film or a sticking film; the first protective film 41 is provided on the surface of the first antireflection film 31 by plating or film-sticking.

In some embodiments, the thickness of the first sub-transparent substrate 11 is less than the thickness of the second sub-transparent substrate 12. That is, the thickness of the sub-transparent substrate at the inner side is smaller than that of the sub-transparent substrate at the outer side, for example, the thickness of the first sub-transparent substrate 11 is smaller than 10mm. This may reduce the occurrence of ghosts.

In some embodiments, at least one of the first sub-transparent substrate, the second sub-transparent substrate, and the intermediate layer is wedge-shaped. This may also have the effect of reducing the occurrence of ghosts.

For example, the first sub-transparent substrate 11 is a wedge-shaped sub-transparent substrate. That is, the shape of the thickness cross section of the inner sub-transparent substrate is wedge-shaped. This may also have the effect of reducing the occurrence of ghosts.

For another example, the intermediate layer 13 is a wedge-shaped intermediate layer. That is, the shape of the thickness cross section of the intermediate layer is wedge-shaped. This may also have the effect of reducing the occurrence of ghosts.

In some embodiments, as shown in fig. 3 or 4, the windshield may further include a second anti-reflection film 32. The second antireflection film 32 is located on the side of the transparent substrate 1 away from the first antireflection film 31. For example, the second antireflection film 32 is located on the surface of the first sub-transparent substrate 11 on the side away from the first antireflection film 31. That is, the second antireflection film 32 is located on the surface of the side of the sub-transparent substrate located at the innermost side (or referred to as the sub-transparent substrate farthest from the first antireflection film) away from the first antireflection film 31. For example, the second anti-reflection film 32 may be provided on the innermost surface of the transparent substrate 1 by plating or laminating. By providing the second antireflection film, transmission of image light of an image source (located on the inner side (e.g., right side) of the transparent substrate, not shown in the drawing) can be increased, and reflection of the image light by the first sub-transparent substrate can be reduced, thereby reducing occurrence of ghost images.

Fig. 5 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure. The windshield shown in fig. 5 is formed by adding a second protective film 42 to the windshield shown in fig. 4.

Fig. 6 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure. The windshield shown in fig. 6 is formed by adding a second protective film 42 to the windshield shown in fig. 3.

The second protective film 42 has been described in detail previously, and will not be described again here.

Fig. 7 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure.

As shown in fig. 7, the windshield includes: a transparent substrate 1, a first antireflection film 31, a first protective film 41, and a transflective film 2. The first antireflection film 31 is located on the first side of the transparent substrate 1. The first protective film 41 is located on the side of the first antireflection film 31 remote from the transparent substrate 1. The transflective film 2 is located on the side of the first antireflection film 31 that is away from the first protective film 41. The transflective film 2 is an S-polarized light transflective film as described above. In this embodiment, the transflective film 2 is located between the first anti-reflective film 31 and the transparent substrate 1. That is, in this embodiment, the transflective film 2 is provided on the outside of the transparent substrate 1, the first antireflection film 31 is provided on the outside surface of the transflective film 2, and the first protection film 41 is provided on the outside of the first antireflection film 31.

As shown in fig. 7, the windshield further includes a second anti-reflection film 32. The second antireflection film 32 is located on the side of the transparent substrate 1 away from the first antireflection film 31. The second antireflection film 32 is located on the surface of the transparent substrate 1. By providing the second antireflection film, the transmission of image light of an image source (located on the inner side (i.e., right side) of the transparent substrate, not shown in fig. 2) can be increased, and the reflection of image light can be reduced.

In the wind shielding window, the second antireflection film is arranged, so that the transmission of image light of an image source can be increased, the reflection of the image light is reduced, and the image light is mainly reflected on the antireflection film by arranging the antireflection film. Therefore, occurrence of ghost can be reduced.

Fig. 8 is a schematic cross-sectional view illustrating a windshield according to another embodiment of the present disclosure.

The windshield shown in fig. 8 is formed by adding a second protective film 42 to the windshield shown in fig. 7. That is, the windshield includes the second protective film 42 in addition to the transparent substrate 1, the first antireflection film 31, the first protective film 41, the antireflection film 2, and the second antireflection film 32. The second protective film 42 may function to protect the second antireflection film. The second protective film 42 has been described in detail previously, and will not be described again here.

The antireflection film and the protective film of the embodiments of the present disclosure are described in further detail below, respectively.

In some embodiments, the first antireflection film 31 includes at least one third layer (may also be referred to as a high refractive index layer) and at least one fourth layer (may also be referred to as a low refractive index layer) alternately arranged, the third layer having a refractive index greater than that of the fourth layer, and the number of layers of the third layer being equal to that of the fourth layer. The second antireflection film 32 may have the same or similar structure as the first antireflection film 31.

For example, the third and fourth layers are both antireflective coatings. Accordingly, the first antireflection film 31 and the second antireflection film 32 each include a plurality of antireflection coatings. The multilayer antireflective coating may include a first antireflective coating (i.e., a third layer) and a second antireflective coating (i.e., a fourth layer) in an alternating stack, where the refractive index of the first antireflective coating is greater than the refractive index of the second antireflective coating. The anti-reflective coating can inhibit reflection on the glass surface.

In the case where the antireflection film (for example, the first antireflection film 31 or the second antireflection film 32) includes a plurality of third layers, the refractive indices of the plurality of third layers may be all the same, or partially the same, or completely different. For example, the antireflection film includes two third layers, which may be the same or different in refractive index. Similarly, in the case where the antireflection film (for example, the first antireflection film 31 or the second antireflection film 32) includes a plurality of fourth layers, the refractive indices of the plurality of fourth layers may be all the same, or partially the same, or completely different. For example, the antireflection film includes two fourth layers, which may be the same or different in refractive index.

Fig. 10 is a schematic cross-sectional view illustrating an antireflection film according to one embodiment of the present disclosure.

As shown in fig. 10, the first antireflection film 31 (or the second antireflection film 32) includes two third layers 311 and 312 and two fourth layers 321 and 322 alternately arranged. It should be noted that the number of layers of the third layer and the fourth layer is merely exemplary, and the scope of the present disclosure is not limited thereto. For example, the number of layers of the third layer and the fourth layer may each be 1 layer, 3 layers, or more. The refractive index of the third layers 311 and 312 is greater than the refractive index of the fourth layers 321 and 322. The number of layers of the third layer is equal to the number of layers of the fourth layer.

In some embodiments, the refractive index n of the third layer ₃ In the range of 2.ltoreq.n ₃ Refractive index n of the fourth layer is less than or equal to 2.5 ₄ In the range of 1.2.ltoreq.n ₄ ≤1.7。

In some embodiments, the refractive index n of the third layer ₃ In the range of 2.1.ltoreq.n ₃ Refractive index n of the fourth layer is less than or equal to 2.3 ₄ In the range of 1.3.ltoreq.n ₄ ≤1.6。

Thus, the refractive index of the third layer (e.g., the first anti-reflective coating) is greater than or equal to 2; the refractive index of the fourth layer (e.g., the second anti-reflective coating) is less than 1.8.

It should be noted that, for a certain third layer, the refractive index of the entire third layer may be the same refractive index, or the third layer may include a plurality of portions (may be referred to as a third portion) whose refractive indices are different; for a certain fourth layer, the refractive index of the entire fourth layer may be the same refractive index, or the fourth layer may include a plurality of portions (may be referred to as fourth portions) which are different in refractive index.

In some embodiments, the fourth layer is further from the transparent substrate than the third layer. For example, assuming that the transparent substrate is located below the antireflection film 31 (or 32) shown in fig. 10 (not shown in fig. 10), the fourth layer 321 is farther from the transparent substrate than the third layer 311, and the fourth layer 322 is farther from the transparent substrate than the third layer 312.

The third and fourth layers may be formed using similar fabrication processes as the first and second layers previously described, and will not be described in detail herein.

In some embodiments, the refractive index of the fourth layer ranges from 1.37 to 1.57. For example, the refractive index of the fourth layer 322 at the outermost layer of the antireflection film 31 (or 32) ranges from 1.37 to 1.57. Preferably, the refractive index of the fourth layer 322 may be 1.47.

In some embodiments, the number of layers of the third layer is less than or equal to 10.

In some embodiments, the third layer has a thickness in the range of 10nm to 150nm and the fourth layer has a thickness in the range of 10nm to 150nm.

In some embodiments, the material of the third layer comprises an inorganic metal compound and the material of the fourth layer comprises an inorganic oxide.

In other embodiments, the first antireflection film 31 includes at least one third layer and at least one fourth layer alternately disposed, the refractive index of the third layer is greater than that of the fourth layer, and the second layer and the fourth layer are the same material layer. The second antireflection film 32 may have the same or similar structure as the first antireflection film 31.

In some embodiments, the range of refractive index of the first protective film 41 and the range of refractive index of the second protective film 42 are each 1.3 to 1.5. That is, the range of refractive index of the first protective film 41 and the range of refractive index of the second protective film 42 are both: greater than or equal to 1.3 and less than or equal to 1.5. Preferably, the refractive index of the first protective film 41 and the refractive index of the second protective film 42 are both about 1.4.

In some embodiments, the ratio of the refractive index of the first anti-reflection film to the refractive index of the first protective film is greater than or equal to 0.8 and less than or equal to 1.2. Thus, the refractive index of the antireflection film is close to that of the protective film, and the reflection at the surface between the antireflection film and the protective film can be reduced.

For example, in the above embodiment, the refractive index of the fourth layer which is the outermost layer among the respective layers of the antireflection film is 1.37 to 1.57 (for example, 1.47), and the refractive index of the first protective film 41 and the refractive index of the second protective film 42 are each 1.3 to 1.5 (for example, about 1.4), so that the refractive index of the antireflection film is relatively close to the refractive index of the protective film, whereby reflection at the surface therebetween can be reduced. Here, the protective film is located on the fourth layer of the outermost layer of the antireflection film.

In the embodiment of the present disclosure, the first protective film 41 and the second protective film 42 may each be an AF film.

In some embodiments, the AF film is a low surface energy film layer. The material of the low surface energy film layer comprises R1-Si (OR 2) ₃ Or Si (R3) _m X _4-m Wherein R1 is an organic group in which at least one H (hydrogen) atom is substituted with F (fluorine) or Cl (chlorine), R2 and R3 are organic groups, X is F or Cl, and 1.ltoreq.m.ltoreq.3.

For example, R1-Si (OR 2) ₃ Comprising the following steps: at least one of heptadecafluorodecyl trimethoxysilane, tridecanyl fluorooctyl triethoxysilane, tridecanyl propyl trimethoxysilane, dodecafluoro alkyl trimethoxysilane or trifluoropropyl trimethoxysilane.

Also for example, si (R3) _m X _4-m Comprising the following steps: at least one of methyltrichlorosilane, methyldodecyldichlorosilane, dimethyldichlorosilane, methylphenyl dichlorosilane, methylvinyldichlorosilane or 3-trifluoropropyltrichlorosilane.

For example, the low surface energy film layer has a surface energy of less than or equal to 0.3Jm ^-2 The refractive index of the low surface energy film layer is smaller than or equal to 1.6, the contact angle of the low surface energy film layer and deionized water is larger than 90 degrees, and the geometric thickness of the low surface energy film layer is 1 to 5 nanometers.

Fig. 11 is a schematic diagram illustrating a structure of a display device according to an embodiment of the present disclosure. For example, the display device is a head-up display device.

In some embodiments, as shown in fig. 11, a display device includes: an image source 110 and a windshield 120. The windscreen is a windscreen as described above. The windshield is configured to reflect S-polarized light emitted by the image source 110 and transmit ambient light. As shown in fig. 11, the windshield 120 may include an imaging window 122. The image source may include a projection device (e.g., a projector) that is directed toward the imaging window 122 of the windshield.

As shown in fig. 11, the image source 110 may generate image light, the image light emitted from the image source 110 is incident on the imaging window 122, and the imaging window 122 reflects the image light to a designated area, for example, the image light is reflected to the eye box area 140, so that an observer (for example, a driver) may view the imaging screen 130 in the direction of the opposite extension line of the image light in the eye box area 140, and the imaging screen is a virtual image.

It will be appreciated that the region in which the observer needs to view the image, i.e. the eyebox region (eyebox), is preset according to the actual requirements, and the eyebox region refers to the region in which the eyes of the observer can see the image displayed by the display device, and may be a planar region or a stereoscopic region, for example.

In some embodiments of the present disclosure, a traffic device is also provided. The traffic device comprises a display device as described above, such as the display device shown in fig. 11. For example, the display device is a head-up display device and the windshield is a windshield of a traffic device.

For example, the traffic device may be various suitable vehicles, and may include various types of land traffic devices such as automobiles, or may be water traffic devices such as ships, or the like, as long as the driving position thereof is provided with a front window and an image is transmitted to the front window through an in-vehicle display system.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An S-polarized light transreflective film comprising: at least one first layer and at least one second layer which are alternately arranged, wherein the refractive index of the first layer is larger than that of the second layer, and the number of layers of the first layer is smaller than or equal to that of the second layer;

The S-polarized light transreflective film is configured to reflect S-polarized light at a first angular range relative to a normal and to transmit ambient light at a second angular range relative to the normal, the S-polarized light transreflective film having a reflectivity of greater than or equal to a first preset value for a first S-polarized light and a reflectivity of at least 5% lower than a reflectivity of the first S-polarized light for light other than the first S-polarized light in a visible light band, wherein the first S-polarized light comprises at least one spectral line or band having a half-peak width of less than or equal to 60 nm.

2. The S-polarized light transreflective film of claim 1, wherein the first preset value is greater than or equal to 50%.

3. The S-polarized light transreflective film of claim 1, wherein:

refractive index n of the first layer ₁ In the range of 1.8<n ₁ Not more than 2.3, the refractive index n of the second layer ₂ In the range of 1.2.ltoreq.n ₂ ≤1.8。

4. The S-polarized light transreflective film according to claim 1,wherein the refractive index n of the first layer ₁ In the range of 1.9.ltoreq.n ₁ 2.2 or less, the refractive index n of the second layer ₂ In the range of 1.3.ltoreq.n ₂ ≤1.6。

5. The S-polarized light transreflective film according to any one of claims 1 to 4, wherein:

the number of layers of the first layer is less than or equal to 50; and/or the number of the groups of groups,

The thickness of the first layer ranges from 1nm to 200nm, and the thickness of the second layer ranges from 1nm to 200nm; and/or the number of the groups of groups,

the material of the first layer comprises an inorganic metal compound and the material of the second layer comprises an inorganic oxide.

6. The S-polarized light transreflective film according to any one of claims 1 to 4, wherein:

the first angle range is 30-89 degrees, and the second angle range is 30-80 degrees; and/or the number of the groups of groups,

the S-polarized light transreflective film has an average transmittance of more than 60% for P-polarized light in a visible light range in the second angle range; and/or the number of the groups of groups,

the first S polarized light comprises at least a first light component, a second light component and a third light component with different wavelengths, the first light component, the second light component and the third light component all comprise spectral lines or spectral bands with half-peak widths less than or equal to 60nm,

the first light component has a wavelength in the range of 410nm to 480nm, and/or,

the second light component has a wavelength in the range of 500nm to 565nm, and/or,

the third light component has a wavelength ranging from 590nm to 690nm.

7. A windshield, comprising:

a transparent substrate;

the first antireflection film is positioned on the first side of the transparent substrate;

The first protective film is positioned on one side of the first antireflection film, which is far away from the transparent substrate; and

a transflective film located on a side of the first antireflection film remote from the first protective film, wherein the transflective film is the S-polarized light transflective film according to any one of claims 1 to 6.

8. The windshield of claim 7, wherein:

the transflective film is positioned on a second side of the transparent substrate, the second side being opposite the first side; or,

the transflective film is positioned between the first anti-reflection film and the transparent substrate.

9. The windshield of claim 7 or 8, wherein the first anti-reflection film comprises at least one third layer and at least one fourth layer arranged alternately, the third layer having a refractive index greater than the fourth layer, the third layer having a number of layers equal to the number of layers of the fourth layer.

10. The windshield of claim 9, wherein the refractive index n of the third layer ₃ In the range of 2.ltoreq.n ₃ Not more than 2.5, the refractive index n of the fourth layer ₄ In the range of 1.2.ltoreq.n ₄ ≤1.7。

11. The windshield of claim 9, wherein the refractive index n of the third layer ₃ In the range of 2.1.ltoreq.n ₃ Not more than 2.3, the refractive index n of the fourth layer ₄ In the range of 1.3.ltoreq.n ₄ ≤1.6。

12. The windshield of claim 9, wherein:

the number of layers of the third layer is less than or equal to 10; and/or the number of the groups of groups,

the thickness of the third layer ranges from 10nm to 150nm, and the thickness of the fourth layer ranges from 10nm to 150nm; and/or the number of the groups of groups,

the material of the third layer comprises an inorganic metal compound and the material of the fourth layer comprises an inorganic oxide.

13. The windshield of claim 7, wherein the first anti-reflection film comprises at least one third layer and at least one fourth layer arranged alternately, the third layer having a refractive index greater than the fourth layer, the second layer and the fourth layer being of the same material.

14. The windshield of claim 7, wherein said transparent substrate comprises:

a plurality of sub-transparent substrates stacked; and

the intermediate layer is arranged between every two adjacent sub-transparent substrates in the plurality of sub-transparent substrates, wherein the transflective film is positioned between one sub-transparent substrate in the plurality of sub-transparent substrates and the intermediate layer, and the intermediate layer is a thermoplastic polymer membrane.

15. The windshield of claim 14, wherein said plurality of sub-transparent substrates is two sub-transparent substrates comprising: the first sub-transparent substrate is far away from the first antireflection film compared with the second sub-transparent substrate, the thickness of the first sub-transparent substrate is smaller than that of the second sub-transparent substrate, and/or at least one of the first sub-transparent substrate, the second sub-transparent substrate and the intermediate layer is wedge-shaped.

16. The windshield of claim 7, wherein:

the transparent and reflective film is attached to or plated on the surface of the transparent substrate, and the first protective film is attached to or plated on the surface of the first antireflection film; and/or

The first side of the transparent substrate is the outer side of the transparent substrate, and the second side of the transparent substrate is the inner side of the transparent substrate; and/or the number of the groups of groups,

the windshield also includes:

the second antireflection film is positioned on one side of the transparent substrate far away from the first antireflection film; the transflective film is positioned on the second side of the transparent substrate, and the transflective film is positioned between the transparent substrate and the second anti-reflection film.

17. The windshield of claim 7, further comprising:

the second antireflection film is positioned on one side of the transparent substrate far away from the first antireflection film; and

and the second protective film is positioned on one side of the second antireflection film, which is far away from the transparent substrate.

18. The windshield of claim 17, wherein:

the first protective film and the second protective film are respectively anti-fingerprint films or hardening films; and/or the number of the groups of groups,

the thickness of the first protective film and the thickness of the second protective film are smaller than or equal to 50nm; and/or the number of the groups of groups,

The range of refractive index of the first protective film and the range of refractive index of the second protective film are each 1.3 to 1.5.

19. The windshield of any of claims 7, 8, 10-18, wherein:

the ratio of the refractive index of the first antireflection film to the refractive index of the first protective film is greater than or equal to 0.8 and less than or equal to 1.2.

20. A display device, comprising:

an image source configured to emit S polarized light; and

a windscreen according to any of the claims 7 to 19, said windscreen being configured to reflect S-polarized light emitted by said image source and to transmit ambient light.

21. A traffic device, comprising: the display device of claim 20.