WO2024066880A1 - S-polarized light transflective film, windshield window, display apparatus, and transportation device - Google Patents

Abstract

The present disclosure provides an S-polarized light transflective film, a windshield window, a display apparatus, and a transportation device. The S-polarized light transflective film comprises: at least one first optical layer and at least one second optical layer arranged alternately, the refractive index of the first optical layer is greater than that of the second optical layer, and the number of the first optical layers is smaller than or equal to that of the second optical layers; and the S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light, the reflectivity of the S-polarized light transflective film to the first S-polarized light is greater than or equal to a first preset value, and the reflectivity to light in a visible light band other than the first S-polarized light is at least 5% lower than that to the first S-polarized light.

Description

S-polarized light transflective film, windshield, display device and traffic equipment

This application claims the priority of Chinese invention patent application No. 202211175744.8 filed on September 26, 2022 and the priority of Chinese utility model patent application No. 202222552785.6. The contents of the above-mentioned Chinese patent application disclosures are hereby cited in their entirety as part of this application.

Technical Field

Embodiments of the present disclosure relate to the field of head-up display technology, and in particular to an S-polarized light transflective film, a windshield, a display device, and traffic equipment.

Background technique

HUD (head up display) is also called a head-up display. By projecting the light emitted by the HUD image source onto the imaging window (rear-mounted imaging board or vehicle windshield, etc.), the user can directly see the image without lowering his head, thereby improving the user experience. For example, in some cases, the driver can avoid being distracted by looking down at the dashboard while driving, thereby improving the driving safety factor and also providing a better driving experience.

Summary of the invention

A technical problem that can be solved by at least one embodiment of the present disclosure is: how to improve the optical effect of the transflective film.

At least one embodiment of the present disclosure provides an S-polarized light transflective film, which includes at least one first optical layer and at least one second optical layer alternately arranged, the refractive index of the first optical layer is greater than the refractive index of the second optical layer, and the number of layers of the first optical layer is less than or equal to the number of layers of the second optical layer; the S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light, the reflectivity of the S-polarized light transflective film to the first S-polarized light is greater than or equal to a first preset value, and the reflectivity to light in the visible light band other than the first S-polarized light is at least 5% lower than the reflectivity to the first S-polarized light.

For example, in at least one embodiment of the present disclosure, in the S-polarized light transflective film provided, the S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light, including: It is configured to reflect S-polarized light within a first angle range relative to a normal line, and transmit ambient light within a second angle range relative to the normal line; wherein the first angle range is 30 degrees to 89 degrees, and the second angle range is 30 degrees to 80 degrees.

For example, in the S-polarized light transflective film provided in at least one embodiment of the present disclosure, the first S-polarized light includes at least one spectral line or spectral band with a half-peak width less than or equal to 60 nm.

At least one embodiment of the present disclosure further provides a windshield, which includes a transparent substrate, a first anti-reflection film, a first protective film and a transflective film, wherein the first anti-reflection film is located on a first side of the transparent substrate; the first protective film is located on a side of the first anti-reflection film away from the transparent substrate; the transflective film is located on a side of the first anti-reflection film away from the first protective film, wherein the transflective film is the S-polarized light transflective film provided in an embodiment of the present disclosure.

At least one embodiment of the present disclosure further provides a display device, comprising an image source and a windshield provided by an embodiment of the present disclosure, wherein the image source is configured to emit S-polarized light; the windshield is configured to reflect the S-polarized light emitted by the image source and transmit ambient light.

At least one embodiment of the present disclosure further provides a traffic device, which includes the display device provided by the embodiment of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

FIG1 is a cross-sectional schematic diagram of a windshield provided by at least one embodiment of the present disclosure;

FIG2 is a cross-sectional schematic diagram of another windshield provided by at least one embodiment of the present disclosure;

FIG3 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG4 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG5 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG6 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG7 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG8 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure;

FIG9 is a cross-sectional schematic diagram of a transflective film provided by at least one embodiment of the present disclosure;

FIG10 is a cross-sectional schematic diagram of an antireflection film provided by at least one embodiment of the present disclosure; and

FIG. 11 is a schematic diagram of the structure of a display device provided by at least one embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In the embodiments of the present disclosure, technologies, methods, and devices known to ordinary technicians in the relevant art may not be discussed in detail, but in appropriate cases, the technologies, methods, and devices should be considered as part of the specification.

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

In view of this, an embodiment of the present disclosure provides an S-polarized light transflective film, which includes at least one first optical layer and at least one second optical layer alternately arranged, the refractive index of the first optical layer is greater than the refractive index of the second optical layer, and the number of the first optical layers is less than or equal to the number of the second optical layers; the S-polarized light transflective film is arranged to reflect S-polarized light and transmit ambient light, the reflectivity of the S-polarized light transflective film to the first S-polarized light is greater than or equal to a first preset value, and the reflectivity to light in the visible light band other than the first S-polarized light is at least 5% lower than the reflectivity to the first S-polarized light, and the S-polarized light transflective film can improve the optical effect.

For example, Fig. 9 is a cross-sectional schematic diagram of a transflective film provided by at least one embodiment of the present disclosure. For example, as shown in Fig. 9, the transflective film 2 is an S-polarized light transflective film. For example, the S-polarized light transflective film is a transparent nanofilm.

It can be understood here that the S-polarized light transflective film is set to have a reflectivity greater than that of the S-polarized light. Reflectivity for P-polarized light.

For example, the S-polarized light transflective film includes at least one first optical layer and at least one second optical layer alternately arranged. The refractive index of the first optical layer is greater than the refractive index of the second optical layer, so the first optical layer can also be called a high refractive index layer, and the second optical layer can also be called a low refractive index layer. For example, the number of first optical layers can be less than or equal to the number of second optical layers.

For example, in the embodiment shown in FIG. 9 , the S-polarized light transflective film 2 includes two first optical layers 211/212 and two second optical layers 221/222 that are alternately arranged, for example, the first optical layer 211, the second optical layer 221, the first optical layer 212, and the second optical layer 222 are stacked in sequence. The refractive index of the first optical layers 211 and 212 is greater than the refractive index of the second optical layers 221 and 222. In order to distinguish different refractive index layers, in the following description, the first optical layer 211 is referred to as a first high refractive index layer 211, the second optical layer 221 is referred to as a first low refractive index layer 221, the first optical layer 212 is referred to as a second high refractive index layer 212, and the second optical layer 222 is referred to as a second low refractive index layer 222.

It should be noted that, in the case where the S-polarized light transflective film includes a plurality of first optical layers, the refractive indexes of the plurality of first optical layers may be all the same, or partly the same, or completely different. For example, the refractive indexes 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 transflective film includes a plurality of second optical layers, the refractive indexes of the plurality of second optical layers may be all the same, or partly the same, or completely different. For example, the refractive indexes of the first low refractive index layer 221 and the second low refractive index layer 222 may be the same or different.

For example, the S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light. For example, the S-polarized light transflective film is configured to reflect S-polarized light at a first angle range relative to the normal line and transmit ambient light at a second angle range relative to the normal line. For example, the first angle range may be 30 to 89 degrees, such as 40 to 80 degrees, such as 50 to 70 degrees, and the second angle range may be 30 to 80 degrees, such as 40 to 70 degrees. In such a first angle range and a second angle range, the transflective film can better reflect S-polarized light and transmit ambient light, thereby achieving a higher reflectivity and transmittance.

For example, the reflectivity of the S-polarized light transflective film to the first S-polarized light is greater than or equal to a first preset value, and the reflectivity to light in the visible light band other than the first S-polarized light is at least 5% lower than the reflectivity to the first S-polarized light.

For example, in some examples, the first preset value is greater than or equal to 50%.

For example, the first S-polarized light includes at least one spectral line or spectral band with a half-peak width less than or equal to 60 nm (nanometers). The wavelength corresponding to the spectral line or spectral band equal to 60nm.

It can be understood that “light in the visible light band except the first S polarized light” includes other S polarized light and P polarized light except the first S polarized light among the S polarized light.

The structure and parameters of the S-polarized light transflective film provided in the embodiments of the present disclosure can improve the optical effect of the transflective film, for example, not only can the reflectivity of the S-polarized light transflective film to S-polarized light be improved, but also the overall transmittance of the S-polarized light transflective film to light in the visible light band can be improved, thereby facilitating users to simultaneously watch the virtual image formed by the image light with S-polarized light and the display imaging of ambient light, and can reduce the brightness requirement for the image source emitting the image light. In addition, the S-polarized light transflective film is easy to design and process, and can be mass-produced to reduce production costs.

It should be noted that, although FIG. 9 shows a stacked structure of two first optical layers and two second optical layers, in other embodiments, other numbers of first optical layers and other numbers of second optical layers may be set according to actual needs. In this case, the S-polarized light transflective film may include a stacked structure of one, two, three or even more first optical layers/second optical layers.

For example, in some embodiments, the refractive index _n1 of the first optical layers 211 and 212 may be in the range of 1.8< _n1≤2.3 , and the refractive index _n2 of the second optical layers 221 and 222 may be in the range of _{1.2≤n2≤1.8} . By adopting such refractive indices, the first optical layer and the second optical layer can achieve a better optical effect and improve the reflectivity of the S-polarized light transflective film to S-polarized light.

For example, in some embodiments, the refractive index _n1 of the first optical layers 211 and 212 may be in the range of _{1.9≤n1≤2.2} , and the refractive index _n2 of the second optical layers 221 and 222 may be in the range of _{1.3≤n2≤1.6} . Through testing, the first optical layer and the second optical layer may further achieve better optical effects by adopting such refractive indices.

It should be noted that, for a certain first optical layer, the refractive index of the entire first optical layer can be the same refractive index, or the first optical layer can include multiple parts (which can be called first parts), and the refractive indexes of the multiple first parts are different; for a certain second optical layer, the refractive index of the entire second optical layer can be the same refractive index, or the second optical layer can include multiple parts (which can be called second parts), and the refractive indexes of the multiple second parts are different.

It should also be noted that different first optical layers may have the same refractive index or different refractive indexes; different second optical layers may have the same refractive index or different refractive indexes.

For example, in some examples, all first optical layers are layers of the same material, and all second optical layers are layers of the same material. The two optical layers are made of the same material. It can be understood that the same material layer means that the materials of these material layers have the same molecular formula.

For example, in some embodiments, the number of first optical layers is less than or equal to 50. Correspondingly, the number of second optical layers is less than or equal to 50. This facilitates reducing the overall number of first optical layers and second optical layers in the S-polarized light transflective film, facilitates the production and processing of the S-polarized light transflective film, improves production efficiency, facilitates improving the uniformity of the overall film layer of the S-polarized light transflective film, and improves the optical effect.

For example, in some embodiments, the thickness of the first optical layer may range from 1 nm to 200 nm, such as 1 nm-150 nm, such as 10 nm-100 nm, and the thickness of the second optical layer may range from 1 nm to 200 nm, such as 1 nm-150 nm, such as 10 nm-100 nm. The first optical layer and the second optical layer within the above thickness range are easier to manufacture, and can avoid the first optical layer being too thin and inconvenient to process, thereby improving the accuracy of the thickness of the first optical layer; the first optical layer and the second optical layer within the above thickness range can also avoid the first optical layer being too thick, resulting in poor uniformity of each optical layer.

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

For example, in the example of Figure 9, the thickness of the first high refractive index layer 211 can be 5nm to 35nm, the thickness of the first low refractive index layer 221 can be 5nm to 35nm, the thickness of the second high refractive index layer 212 can be 20nm to 50nm, and the thickness of the second low refractive index layer 222 can be 80nm to 130nm.

It should be noted that in the description of the present disclosure, when a parameter is described as ranging from A to B, it indicates that the parameter includes the two endpoints of the range, namely A and B. For example, if the thickness of the first optical layer ranges from 1 nm to 200 nm, the thickness of the first optical layer may be 1 nm or 200 nm. The description of the ranges of other parameters is similar and will not be repeated here.

For example, in some embodiments, the material of the first optical layer includes an inorganic metal compound, such as _tantalum pentoxide ( _Ta2O5 ), titanium dioxide ( _TiO2 ), magnesium fluoride ( _MgF2 ), etc., or a mixture of the above materials; the material of the second optical layer includes an inorganic oxide, such as silicon dioxide ( _SiO2 ), silicon nitride (SiN) or silicon oxynitride (SiNO), etc., or a mixture of the above materials.

For example, in some embodiments, the average transmittance of the S-polarized light transflective film for P-polarized light in the visible light range is greater than 60% within the second angle range. The transflective film increases the transmittance of P-polarized light, thereby improving the overall transmittance of visible light.

For example, in some embodiments, the first S polarized light includes 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 include a spectrum line or a spectrum band with a half-peak width less than or equal to 60nm. For example, the wavelength of the first light component ranges from 410nm to 480nm. For example, the wavelength of the second light component ranges from 500nm to 565nm. For example, the wavelength of the third light component ranges from 590nm to 690nm. This facilitates improving the imaging effect of the first S polarized light.

The S-polarized light transflective film provided in the embodiment of the present disclosure has a simpler preparation process. For example, the first optical layer and the second optical layer can be formed by coating using a conventional physical vapor deposition (e.g., evaporation, sputtering, etc.) method or deposited using a chemical vapor deposition method. For example, both the first optical layer and the second optical layer can be formed by horizontal magnetron sputtering coating.

For example, in some embodiments, the manufacturing process of the first optical layer and the second optical layer may include: pre-treating, cleaning and other processes on the original glass of the glass plate (for example, which can be used as a transparent substrate), and then sending the original glass to a sputtering coating production line equipped with multiple coating cathodes, and depositing each film layer on the original glass in sequence according to the stacking structure of the first optical layer/second optical layer and its thickness design; after the coating is completed, high-temperature molding, lamination and other operations are performed; then, a low surface energy film layer (for example, the AF film described later) can be coated and arranged on the surface of the stacking structure of the first optical layer/second optical layer before or after lamination, and the coating process may include surface cleaning, coating (for example, spraying, dipping or smearing, etc.), drying and other steps.

In addition, the inventors of the present disclosure have also found in their research that the front windshield of a vehicle is usually laminated glass, which is composed of at least two glass substrates with a certain curvature and an intermediate layer sandwiched between different glass substrates. The light emitted by the projection light source of the head-up display system will be reflected when passing through the two surfaces of the laminated glass in contact with the air, and the reflected images on the two surfaces will be offset to form two mutually interfering ghost images. Therefore, due to the large change in the refractive index of the glass-air interface of the windshield, it is easy to cause the reflection of the image source light to form a ghost image.

In view of this, an embodiment of the present disclosure further provides a windshield, which includes a transparent substrate, a first anti-reflection film, a first protective film and a transflective film, wherein the first anti-reflection film is located on a first side of the transparent substrate; the first protective film is located on a side of the first anti-reflection film away from the transparent substrate; the transflective film is located 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 provided in an embodiment of the present disclosure. The windshield can reduce the occurrence of ghosting on the windshield.

For example, FIG1 is a cross-sectional schematic diagram of a windshield provided by at least one embodiment of the present disclosure.

As shown in FIG. 1 , the windshield includes a transparent substrate 1 , a first anti-reflection (AR for short, also known as anti-reflection) film 31 , a first protective film 41 and a transflective film 2 .

In an embodiment of the present disclosure, an anti-reflection film can increase the transmittance of light. The first anti-reflection film 31 is located on the first side of the transparent substrate 1. For example, the first anti-reflection film 31 is located on the surface of the first side of the transparent substrate 1. The first protective film 41 is located on the side of the first anti-reflection film 31 away from the transparent substrate 1. The transflective film 2 is located on the side of the first anti-reflection film 31 away from the first protective film 41. For example, as shown in FIG. 1, the transflective film 2 is located on the second side of the transparent substrate 1, and the second side 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 anti-reflection film 31. For example, the transflective film 2 is located on the surface of the second side of the transparent substrate 1.

Here, the transflective film refers to a film layer that reflects a portion of light and transmits another portion of light. For example, the transflective film 2 is an S-polarized light transflective film provided in an embodiment of the present disclosure.

For example, in some embodiments, the first side of the transparent substrate 1 is the outer side of the transparent substrate, and the second side of the transparent substrate 1 is the inner side of the transparent substrate.

It should be noted that the "outside" and "inside" here can be relative to the position of the image source of the head-up display, or can also 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 Figure 1), then 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 installed on the vehicle as a windshield, the right side of the transparent substrate is the interior of the vehicle, that is, the inner side of the transparent substrate, and the left side of the transparent substrate is the exterior of the vehicle, that is, the outer side of the transparent substrate. Exemplarily, in the drawings of the embodiments of the present disclosure, the right side of the transparent substrate can be regarded as the inner side of the transparent substrate, and the left side of the transparent substrate can be regarded as the outer side of the transparent substrate. Of course, those skilled in the art will understand that this is merely exemplary, and the embodiments of the present disclosure are not limited thereto.

For example, in some embodiments, the transflective film is attached or plated on the surface of the transparent substrate. That is, the transflective film can be disposed on the transparent substrate by means of film attachment or film coating. The first anti-reflective film can be disposed on the outermost surface of the transparent substrate by means of film coating or film attachment. The first protective film is attached or plated on the surface of the first anti-reflective film. That is, the first protective film can be disposed on the surface of the first anti-reflective film by means of film coating or film attachment.

In the windshield provided by the embodiment of the present disclosure, a transflective film is arranged on the inner surface of the transparent substrate, which can improve the reflection effect of the image light emitted by the image source and realize the transmission of external light; a first anti-reflective film is arranged on the outer surface of the transparent substrate, and the first anti-reflective film It can increase the transmittance, buffer the refractive index between the glass and air interface, and reduce the occurrence of reflections and ghosting. In this way, the reflection of the image light of the image source on the windshield surface is increased, the brightness requirement of the image source is reduced, and the occurrence of ghosting on the windshield can be reduced, so that better visual effects can be obtained and costs can be reduced. For example, reducing ghosting can improve the display effect of the picture and improve the safety of vehicle driving. In addition, the first protective film can protect the first anti-reflection film, prevent the first anti-reflection film from being contaminated by stains or scratched by sharp objects, and facilitate improving the service life and working reliability of the first anti-reflection film.

For example, in some embodiments, the first protective film 41 may be an anti-fingerprint (AF) film or a hardened film. The AF film may have properties such as oleophobic, hydrophobic, and scratch-resistant, thereby protecting the first anti-reflection film 31. This may make it difficult for fingerprints or other dirt to be stained on the outer surface of the windshield, thereby achieving the effects of being waterproof, oil-proof, and dust-proof, and keeping the outer surface clean.

For example, in some embodiments, the thickness of the first protective film is less than or equal to 50 nanometers, such as less than or equal to 30 nanometers. For example, in some examples, the thickness of the first protective film can be less than or equal to 10 nanometers, such as less than or equal to 5 nanometers. For example, in some examples, the thickness of the first protective film is 2 nanometers to 3 nanometers. The thickness of the first protective film is small and will not substantially affect the optical performance of the first anti-reflection film.

For example, FIG2 is a cross-sectional schematic diagram of another windshield provided by at least one 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 anti-reflection film 31 , a first protective film 41 and a transflective film 2 .

For example, in some embodiments, as shown in FIG. 2 , the windshield may further include a second anti-reflection film 32. The second anti-reflection film 32 is located on a side of the transparent substrate 1 away from the first anti-reflection film 31. For example, the second anti-reflection film 32 is located on a surface of the transflective film 2 on a side 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-reflection film 32. By providing the second anti-reflection 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 transflective film 2.

For example, in some embodiments, as shown in FIG. 2 , the windshield may further include a second protective film 42. The second protective film 42 is located on the side of the second anti-reflection film 32 away from the transparent substrate 1. For example, the second protective film 42 is located on the surface of the second anti-reflection film 32. For example, the second protective film 42 is an anti-fingerprint film or a hardening film. The second protective film has properties such as oleophobic, hydrophobic, and scratch-resistant, and can be To protect the second anti-reflection film.

For example, in some embodiments, the thickness of the second protective film is less than or equal to 50 nanometers, for example, less than or equal to 10 nanometers. Exemplarily, the thickness of the second protective film is less than or equal to 5 nanometers; for example, the thickness of the second protective film is 2 nanometers to 3 nanometers. The thickness of the second protective film is small and will not substantially affect the function of the second antireflection film.

For example, FIG3 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure.

As shown in FIG3 , the windshield includes: a transparent substrate 1, a first anti-reflection film 31, a first protective film 41 and a transflective film 2. The first anti-reflection film 31 is located on a first side of the transparent substrate 1. For example, the first anti-reflection film 31 is located on a surface of the transparent substrate 1. The first protective film 41 is located on a side of the first anti-reflection film 31 away from the transparent substrate 1. The transflective film 2 is located on a side of the first anti-reflection film 31 away from the first protective film 41. The first protective film 41 has been described in detail above and will not be repeated here.

For example, in some embodiments, the transparent substrate 1 includes a plurality of sub-transparent substrates (e.g., glass substrates) stacked together. For example, in the embodiment 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, and the first sub-transparent substrate 11 is farther away from the first anti-reflection 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 FIG3 shows that the transparent substrate 1 includes two sub-transparent substrates 11 and 12, the embodiments of the present disclosure are 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.

For example, in some embodiments, the transparent substrate 1 further includes at least one intermediate layer 13. The intermediate layer 13 is disposed between every two adjacent sub-transparent substrates in the plurality of sub-transparent substrates. For example, in the embodiment shown in FIG3 , 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 (for example, the material of the film includes polyvinyl butyral, referred to as PVB).

Of course, those skilled in the art will understand that, when the transparent substrate includes more (e.g., three, four, etc.) sub-transparent substrates, the transparent substrate includes more intermediate layers. For example, when the transparent substrate includes three sub-transparent substrates, the transparent substrate includes two intermediate layers, each of which is disposed between every two adjacent sub-transparent substrates. For another example, when the transparent substrate includes four sub-transparent substrates, the transparent substrate includes three intermediate layers, Each intermediate layer is disposed between every two adjacent sub-transparent substrates.

For example, in the above embodiments, the transparent substrate may be a composite transparent substrate, such as a composite glass plate.

For example, in some embodiments, the transflective film is located between one of the plurality of sub-transparent substrates and the intermediate layer. For example, as shown in FIG3 , 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, which is easy to process and shape in terms of process implementation, and can prevent the transflective film from being scratched or stained with dirt.

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

For example, in some embodiments, the transflective film is located on the 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.

For example, FIG4 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure. Different from the windshield shown in FIG3, in the windshield shown in FIG4, 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. The transflective film 2 is located on the side of the first anti-reflection film 31 away from the first protective film 41.

In the embodiment of the present disclosure, the surfaces of the first sub-transparent substrate and the second sub-transparent substrate are sequentially referred to as the first surface, the second surface, the third surface, and the fourth surface from the inside to the outside (for example, 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. In other words, the transflective film can be disposed on one of the two opposite surfaces of the two adjacent sub-transparent substrates.

For example, in some embodiments, the transflective film 2 can be arranged between the sub-transparent substrate and the intermediate layer by means of film sticking or coating; the first anti-reflection film 31 can be arranged on the outermost surface of the transparent substrate 1 by means of coating or sticking; the first protective film 41 is arranged on the surface of the first anti-reflection film 31 by means of coating or sticking.

For example, 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 inner sub-transparent substrate is less than the thickness of the outer sub-transparent substrate, for example, the thickness of the first sub-transparent substrate 11 is less than 10 mm. This can reduce the occurrence of ghosting.

For example, in some embodiments, at least one of the first sub-transparent substrate, the second sub-transparent substrate and the intermediate layer is wedge-shaped, which can also reduce the occurrence of ghosting.

For example, in some examples, the first sub-transparent substrate 11 is a wedge-shaped sub-transparent substrate, that is, the thickness cross section of the inner sub-transparent substrate is wedge-shaped, which can also reduce the occurrence of ghosting.

For example, in some examples, the intermediate layer 13 is a wedge-shaped intermediate layer, that is, the shape of the thickness cross section of the intermediate layer is a wedge, which can also play an effect of reducing the occurrence of ghosting.

For example, in some examples, the second sub-transparent substrate 12 is a wedge-shaped sub-transparent substrate, that is, the thickness cross-section of the sub-transparent substrate on the outside is wedge-shaped, which can also play an effect of reducing the occurrence of ghosting.

For example, in some examples, the first sub-transparent substrate 11 is a wedge-shaped sub-transparent substrate, and the intermediate layer 13 is a wedge-shaped intermediate layer, which can also play an effect of reducing the occurrence of ghosting.

For example, in some embodiments, as shown in FIG. 3 or FIG. 4 , the windshield may further include a second antireflection 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 innermost sub-transparent substrate (or the sub-transparent substrate farthest from the first antireflection film) on the side away from the first antireflection film 31. For example, the second antireflection film 32 can be arranged on the innermost surface of the transparent substrate 1 by coating or pasting. By arranging the second antireflection film, the transmission of the image light of the image source (located on the inner side (e.g., right side) of the transparent substrate, not shown in the figure) can be increased, and the reflection of the image light by the first sub-transparent substrate can be reduced, thereby reducing the occurrence of ghosting.

Fig. 5 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure. Compared with the windshield shown in Fig. 4 , the windshield shown in Fig. 5 is provided with a second protective film 42 .

Fig. 6 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure. Compared with the windshield shown in Fig. 3 , the windshield shown in Fig. 6 is provided with a second protective film 42 .

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

FIG. 7 is a cross-sectional schematic diagram of yet another windshield according to at least one embodiment of the present disclosure.

For example, as shown in FIG7 , 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 a first side of the transparent substrate 1. The first protective film 41 is located on a side of the first antireflection film 31 away from the transparent substrate 1. The transflective film 2 is located on a side of the first antireflection film 31 away from the first protective film 41. The transflective film 2 is the S Polarized light transflective film. 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 arranged on the outside of the transparent substrate 1, the first anti-reflective film 31 is arranged on the outer surface of the transflective film 2, and the first protective film 41 is arranged on the outside of the first anti-reflective film 31.

For example, as shown in FIG7 , the windshield may further include a second antireflection film 32. The second antireflection film 32 is located on a 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 transparent substrate 1. By providing the second antireflection film, the transmission of the image light of the image source (located on the inner side (i.e., right side) of the transparent substrate, not shown in FIG2 ) can be increased, and the reflection of the image light can be reduced.

In the above windshield, by providing the second antireflection film, the transmission of the image light of the image source can be increased and the reflection of the image light can be reduced, and by providing the transflective film, the image light is mainly reflected on the transflective film, thereby reducing the occurrence of ghosting.

FIG. 8 is a cross-sectional schematic diagram of yet another windshield provided by at least one embodiment of the present disclosure.

Compared with the windshield shown in FIG7 , the windshield shown in FIG8 has a second protective film 42. That is, in addition to the transparent substrate 1, the first anti-reflection film 31, the first protective film 41, the transflective film 2 and the second anti-reflection film 32, the windshield also includes the second protective film 42. The second protective film 42 can protect the second anti-reflection film. The second protective film 42 has been described in detail above and will not be repeated here.

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

For example, in some embodiments, the first anti-reflection film 31 includes at least one third optical layer and at least one fourth optical layer alternately arranged, the refractive index of the third optical layer is greater than the refractive index of the fourth optical layer, so that the third optical layer can also be called a high refractive index layer, and the fourth optical layer can also be called a low refractive index layer. The number of layers of the third optical layer is equal to the number of layers of the fourth optical layer. The structure of the second anti-reflection film 32 can be the same or similar to the structure of the first anti-reflection film 31.

For example, the third optical layer and the fourth optical layer are both anti-reflection coatings. Therefore, the first anti-reflection film 31 and the second anti-reflection film 32 respectively include a multilayer anti-reflection coating. The multilayer anti-reflection coating may include a first anti-reflection coating (i.e., the third optical layer) and a second anti-reflection coating (i.e., the fourth optical layer) alternately stacked, wherein the refractive index of the first anti-reflection coating is greater than the refractive index of the second anti-reflection coating. The anti-reflection coating can suppress reflection on the glass surface.

It should be noted that, in the anti-reflection film (for example, the first anti-reflection film 31 or the second anti-reflection film 32) In the case where a plurality of third optical layers are included, the refractive indices of the plurality of third optical layers may be all the same, or partly the same, or completely different. For example, the antireflection film includes two third optical layers, and the refractive indices of the two third optical layers may be the same or different. 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 optical layers, the refractive indices of the plurality of fourth optical layers may be all the same, or partly the same, or completely different. For example, the antireflection film includes two fourth optical layers, and the refractive indices of the two fourth optical layers may be the same or different.

FIG. 10 is a schematic cross-sectional view of an antireflection film provided by at least one embodiment of the present disclosure.

As shown in FIG. 10 , in some embodiments, the first anti-reflection film 31 (or the second anti-reflection film 32) includes two third optical layers 311 and 312 and two fourth optical layers 321 and 322 that are alternately arranged. It should be noted that the number of the third optical layer and the fourth optical layer here is only exemplary, and the embodiments of the present disclosure are not limited thereto. For example, the number of the third optical layer and the fourth optical layer can both be 1 layer, 3 layers or more layers. The refractive index of the third optical layers 311 and 312 is greater than the refractive index of the fourth optical layers 321 and 322. The number of the third optical layer is equal to the number of the fourth optical layer.

For example, in some embodiments, the refractive index _n3 of the third optical layer is in the range of _2≤n3≤2.5 , and the refractive index _n4 of the fourth optical layer is in the range of _{1.2≤n4≤1.7} .

For example, in some embodiments, the refractive index _n3 of the third optical layer is in the range of _{2.1≤n3≤2.3} , and the refractive index _n4 of the fourth optical layer is in the range of _{1.3≤n4≤1.6} .

Therefore, the refractive index of the third optical layer (eg, the first anti-reflective coating) is greater than or equal to 2; and the refractive index of the fourth optical layer (eg, the second anti-reflective coating) is less than 1.8.

It should be noted that, for a certain third optical layer, the refractive index of the entire third optical layer may be the same refractive index, or the third optical layer may include multiple parts (which may be called third parts), and the refractive indexes of the multiple third parts are different; for a certain fourth optical layer, the refractive index of the entire fourth optical layer may be the same refractive index, or the fourth optical layer may include multiple parts (which may be called fourth parts), and the refractive indexes of the multiple fourth parts are different.

For example, in some embodiments, the fourth optical layer is further away from the transparent substrate than the third optical layer. For example, assuming that the transparent substrate is located below the anti-reflection film 31 (or 32) shown in FIG. 10 (not shown in FIG. 10), the fourth optical layer 321 is further away from the transparent substrate than the third optical layer 311, and the fourth optical layer 322 is further away from the transparent substrate than the third optical layer 312.

The third optical layer and the fourth optical layer may be formed in the same manner as the first optical layer and the second optical layer described above. The optical layer is formed by a similar manufacturing process and will not be described in detail here.

For example, in some embodiments, the refractive index of the fourth optical layer ranges from 1.37 to 1.57. For example, the refractive index of the fourth optical layer 322 at the outermost layer of the anti-reflection film 31 (or 32) ranges from 1.37 to 1.57. For example, in some examples, the refractive index of the fourth optical layer 322 may be 1.47.

For example, in some embodiments, the number of the third optical layers is less than or equal to 10. Correspondingly, the number of the fourth optical layers is less than or equal to 10.

For example, in some embodiments, the thickness of the third optical layer ranges from 10 nm to 150 nm, such as 50 nm-100 nm; the thickness of the fourth optical layer ranges from 10 nm to 150 nm, such as 50 nm-100 nm.

For example, in some embodiments, the material of the third optical layer includes an inorganic metal compound, such as _tantalum pentoxide ( _Ta2O5 ), titanium dioxide ( _TiO2 ), magnesium fluoride ( _MgF2 ), etc., or a mixture of the above materials; the material of the fourth optical layer includes an inorganic oxide, such as silicon dioxide ( _SiO2 ), silicon nitride (SiN) or silicon oxynitride (SiNO), etc., or a mixture of the above materials.

For example, in some other embodiments, the first anti-reflection film 31 includes at least one third optical layer and at least one fourth optical layer alternately arranged, the refractive index of the third optical layer is greater than the refractive index of the fourth optical layer, and the second optical layer and the fourth optical layer are made of the same material layer. The structure of the second anti-reflection film 32 can be the same or similar to that of the first anti-reflection film 31.

For example, in some embodiments, the refractive index of the first protective film 41 and the refractive index of the second protective film 42 are both in the range of 1.3 to 1.5. That is, the refractive index of the first protective film 41 and the 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. For example, in some examples, the refractive index of the first protective film 41 and the refractive index of the second protective film 42 are both about 1.4.

For example, in some embodiments, 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. In this way, the refractive index of the antireflection film and the protective film is close, which can reduce the reflection of the surface between the two.

For example, in the above embodiment, the refractive index of the outermost fourth optical layer in each layer 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 both 1.3 to 1.5 (for example, about 1.4). In this way, the refractive index of the antireflection film is close to that of the protective film, so that the difference between the two can be reduced. At this time, the protective film can be located on the outermost fourth optical layer of the anti-reflection film.

For example, in the embodiment of the present disclosure, the first protective film 41 and the second protective film 42 may both be AF films.

For example, in some embodiments, the AF film is a low surface energy film layer. The material of the low surface energy film layer includes at least one of R1-Si(OR2) ₃ or Si(R3) _m X _4-m , wherein R1 is an organic group in which at least one H (hydrogen) atom is replaced by F (fluorine) or Cl (chlorine), R2 and R3 are organic groups, X is F or Cl, and 1≤m≤3.

For example, R1-Si(OR2) ₃ includes at least one of heptadecafluorodecyltrimethoxysilane, tridecafluorooctyltriethoxysilane, tridecafluoroalkylpropyltrimethoxysilane, dodecafluoroalkyltrimethoxysilane or trifluoropropyltrimethoxysilane.

For another example, Si(R3) _m X _4-m includes at least one of methyltrichlorosilane, methyldodecyldichlorosilane, dimethyldichlorosilane, methylphenyldichlorosilane, methylvinyldichlorosilane or 3-trifluoropropyltrichlorosilane.

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

Fig. 11 is a schematic diagram of the structure of a display device provided by at least one embodiment of the present disclosure. For example, the display device is a head-up display device.

For example, in some embodiments, as shown in FIG11 , the display device includes an image source 110 and a windshield 120. The windshield is a windshield provided in an embodiment of the present disclosure. The windshield is configured to reflect the S-polarized light emitted by the image source 110 and transmit ambient light. For example, as shown in FIG11 , the windshield 120 may include an imaging window 122. The image source may include a projection device (e.g., a projector) that points to the imaging window 122 of the windshield.

For example, as shown in FIG11 , the image source 110 can generate image light, and the image light emitted by 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 (such as a driver) can view the imaging picture 130 in the eye box area 140 along the reverse extension line direction of the image light, and the imaging picture is a virtual image.

It can be understood here that the area where the observer needs to view the image, that is, the eye box area (eyebox), can be preset according to actual needs. The eye box area refers to the area where the observer's eyes are located and the image displayed by the display device can be seen, for example, it can be a plane area or a three-dimensional area.

At least one embodiment of the present disclosure further provides a traffic device. The traffic device includes a display device provided in an embodiment of the present disclosure, such as the display device shown in FIG11. For example, the display device is a head-up display device, and the windshield is a windshield of the traffic device.

For example, the transportation equipment can be various appropriate means of transportation, such as land transportation equipment such as various types of cars, or water transportation equipment such as ships, etc., as long as a front window is set at the driving position and the image is projected onto the front window through the vehicle-mounted display system.

There are a few points to note:

(1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

(2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

(3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims (21)

1. An S-polarized light transflective film, comprising: at least one first optical layer and at least one second optical layer arranged alternately, the refractive index of the first optical layer is greater than the refractive index of the second optical layer, and the number of the first optical layer is less than or equal to the number of the second optical layer;

   The S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light. The reflectivity of the S-polarized light transflective film to a first S-polarized light is greater than or equal to a first preset value, and the reflectivity to light in the visible light band other than the first S-polarized light is at least 5% lower than the reflectivity to the first S-polarized light.
2. The S-polarized light transflective film according to claim 1, wherein the S-polarized light transflective film is configured to reflect S-polarized light and transmit ambient light, comprising:

   The S-polarized light transflective film is configured to reflect S-polarized light within a first angle range relative to the normal line, and transmit ambient light within a second angle range relative to the normal line;

   Among them, the first angle range is 30 degrees to 89 degrees, and the second angle range is 30 degrees to 80 degrees.
3. The S-polarized light transflective film according to claim 1 or 2, wherein the first S-polarized light includes at least one spectral line or spectral band with a half-peak width less than or equal to 60 nm.
4. The S-polarized light transflective film according to any one of claims 1 to 3, wherein the first preset value is greater than or equal to 50%.
5. The S-polarized light transflective film according to any one of claims 1 to 4, wherein:

   The refractive index _n1 of the first optical layer is in the range of 1.8< _n1≤2.3 , and the refractive index _n2 of the second optical layer is in the range of _{1.2≤n2≤1.8} .
6. The S-polarized light transflective film according to any one of claims 1 to 5, wherein:

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

   The thickness of the first optical layer is in a range of 1 nm to 200 nm, and the thickness of the second optical layer is in a range of 1 nm to 200 nm; and/or,

   The material of the first optical layer includes an inorganic metal compound, and the material of the second optical layer includes an inorganic oxide.
7. The S-polarized light transflective film according to claim 2, wherein:

   The average transmittance of the S-polarized light transflective film to P-polarized light in the visible light range within the second angle range is greater than 60%; and/or,

   The first S-polarized light comprises at least a first light component, a second light component and a third light component with different wavelengths, wherein the first light component, the second light component and the third light component all comprise a spectral line or a spectral band with a half-peak width less than or equal to 60 nm,

   The wavelength of the first light component ranges from 410 nm to 480 nm, and/or,

   The wavelength of the second light component ranges from 500 nm to 565 nm, and/or,

   The wavelength of the third light component ranges from 590 nm to 690 nm.
8. A windshield, comprising:

   Transparent substrate;

   A first anti-reflection film, located on a first side of the transparent substrate;

   A first protective film, located on a side of the first anti-reflection film away from the transparent substrate; and

   A transflective film is located on a side of the first anti-reflection film away from the first protective film, wherein the transflective film is the S-polarized light transflective film as claimed in any one of claims 1 to 7.
9. The windshield according to claim 8, wherein:

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

   The transflective film is located between the first anti-reflective film and the transparent substrate.
10. The windshield according to claim 8 or 9, wherein the first antireflection film comprises at least one third optical layer and at least one fourth optical layer alternately arranged, the refractive index of the third optical layer is greater than the refractive index of the fourth optical layer, and the number of the third optical layers is equal to the number of the fourth optical layers.
11. The windshield according to claim 10, wherein the refractive index _n3 of the third optical layer is in the range of _2≤n3≤2.5 , and the refractive index _n4 of the fourth optical layer is in the range of _{1.2≤n4≤1.7} .
12. The windshield according to claim 10, wherein:

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

    The thickness of the third optical layer is in a range of 10 nm to 150 nm, and the thickness of the fourth optical layer is in a range of 10 nm to 150 nm; and/or,

    The material of the third optical layer includes an inorganic metal compound, and the material of the fourth optical layer includes an inorganic oxide.
13. The windshield according to claim 8, wherein the first anti-reflection film comprises at least one third optical layer and at least one fourth optical layer alternately arranged, the refractive index of the third optical layer is greater than the refractive index of the fourth optical layer, and the second optical layer and the fourth optical layer are layers of the same material.
14. The windshield according to claim 8, wherein the transparent substrate comprises:

    A plurality of sub-transparent substrates arranged in a stacked manner; and

    an intermediate layer, disposed between every two adjacent sub-transparent substrates among the plurality of sub-transparent substrates,

    The transflective film is located between one of the plurality of sub-transparent substrates and the intermediate layer, and the intermediate layer is a thermoplastic polymer film.
15. The windshield according to claim 14, wherein the plurality of sub-transparent substrates are two sub-transparent substrates, and the two sub-transparent substrates include: a first sub-transparent substrate and a second sub-transparent substrate, wherein:

    The first sub-transparent substrate is further away from the first anti-reflection film than the second sub-transparent substrate, the thickness of the first sub-transparent substrate is less than the thickness 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 according to claim 8, wherein:

    The transflective film is attached or plated on the surface of the transparent substrate, and the first protective film is attached or plated on the 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 anti-reflection film is located on a side of the transparent substrate away from the first anti-reflection film; wherein the transflective film is located on the second side of the transparent substrate, and the transflective film is located between the transparent substrate and the second anti-reflection film.
17. The windshield according to claim 8, further comprising:

    A second anti-reflection film is located on a side of the transparent substrate away from the first anti-reflection film; and

    The second protective film is located on a side of the second anti-reflection film away from the transparent substrate.
18. The windshield according to claim 17, wherein:

    The first protective film and the second protective film are respectively an anti-fingerprint film or a hardening film; and/or,

    The thickness of the first protective film and the thickness of the second protective film are both less than or equal to 50 nm; and/or,

    The refractive index of the first protective film and the refractive index of the second protective film are both in the range of 1.3 to 1.5.
19. The windshield according to any one of claims 8, 9, 11-18, wherein:

    A ratio of a refractive index of the first antireflection film to a 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 windshield as claimed in any one of claims 8 to 19,

    Wherein, the windshield is configured to reflect S-polarized light emitted by the image source and transmit ambient light.
21. A traffic equipment, comprising: the display device as claimed in claim 20.