CN218805124U - Windshield, display device and traffic equipment - Google Patents

Abstract

The present disclosure provides a windshield, a display device and a traffic device. The windshield includes: a transparent substrate; a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, wherein the transflective film includes at least one first layer and at least one second layer alternately arranged, and a refractive index n of the first layer ₁ In the range of 1.8<n ₁ 2.6 or less, refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ ≤1.8。

Description

Windshield, display device and traffic equipment

Technical Field

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

Background

Currently, in the head-up display technology, a front windshield of an automobile itself or an additionally arranged optical element is generally used for image display, for example, the front windshield is used for reflecting image light. However, in the head-up display technology, the function of the windshield as a display device is relatively simple.

SUMMERY OF THE UTILITY MODEL

The technical problem that this disclosure solved is: the inventors of the present disclosure have found that designing the transflective film of the windshield according to the interface contacting with air may affect the performance of the transflective film if the filter film is attached to the transflective film of the windshield.

According to a first aspect of the present disclosure, there is provided a windshield comprising: a transparent substrate; a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, wherein the transflective film includes at least one first layer and at least one second layer alternately arranged, and a refractive index n of the first layer is ₁ In the range of 1.8<n ₁ 2.6 or less, the refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ ≤1.8。

In the above design, the design parameters of the transflective film can make the performance of the transflective film not affected by the filter film attached thereon.

In the windshield of the first aspect, in some embodiments, the windshield further comprises: and the light filter film is positioned on one side of the transflective film.

In the windshield of the first aspect, in some embodiments, the filter film is located on a side surface of the transflective film away from the transparent substrate; and/or the refractive index of the filter film ranges from 1.2 to 1.8, and the design parameters of the transflective film are respectively matched with the surface of the transparent substrate and the surface of the filter film.

In the windshield of the first aspect, in some embodiments, the refractive index of the filter film ranges from 1.4 to 1.6, and the design parameters of the transflective film are matched with the surface of the transparent substrate and the surface of the filter film, respectively.

In the windshield of the first aspect, in some embodimentsIn (b), 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 Less than or equal to 1.6; and/or the number of the first layers is equal to that of the second layers, and the number of the first layers is less than or equal to 50; and/or the first layer has a thickness in the range of 1nm to 300nm and the second layer has a thickness in the range of 1nm to 300nm; and/or the material of the first layer is an inorganic metal compound, and the material of the second layer is an inorganic oxide.

In the windshield of the first aspect, in some embodiments, the transparent substrate comprises a first sub transparent substrate, a second sub transparent substrate, and an intermediate layer between the first sub transparent substrate and the second sub transparent substrate, wherein the first sub transparent substrate is closer to the transflective film than the second sub transparent substrate, the thickness of the first sub transparent substrate is less 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 the windscreen of the first aspect, in some embodiments, the transparent substrate comprises a convex outer surface and a concave outer surface opposite the convex outer surface, the transflective film being located on a side of the concave outer surface remote from the convex outer surface.

According to a second aspect of the present disclosure, there is provided a windshield, comprising: a transparent substrate; a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, design parameters of the transflective film being respectively matched with a surface of the transparent substrate and air; and a filter film located inside the transparent substrate.

In the above design, since the filter film is not disposed on the transflective film, the display function of the windshield is not affected. In addition, the filter film is arranged inside the transparent substrate, so that the filtering function of the windshield is improved.

In the windshield of the second aspect, in some embodiments, the transflective film includes at least one first layer and at least one second layer alternately arranged, the first layer has a refractive index greater than that of the second layer, and the number of the first layers is not equal to that of the second layer.

In the windshield of the second aspect, in some embodiments, the transparent substrate includes: a plurality of sub transparent substrates arranged in a stack; and the intermediate layer is arranged between every two adjacent sub transparent substrates in the plurality of sub transparent substrates, and the filter film is positioned between at least one sub transparent substrate in the plurality of sub transparent substrates and the intermediate layer.

In the windshield of the second aspect, in some embodiments, the filter film is plated or attached on a surface of the at least one sub transparent substrate; and/or a ratio of a refractive index difference between the intermediate layer and each of the plurality of sub transparent substrates to a refractive index of each of the sub transparent substrates is less than or equal to 50%.

In the windshield of the second aspect, in some embodiments, the transparent substrate includes: a plurality of sub transparent substrates arranged in a stack; and the intermediate layer is arranged between every two adjacent sub transparent substrates in the plurality of sub transparent substrates, wherein the filter film is positioned inside the intermediate layer.

According to a third aspect of the present disclosure, there is provided a windshield comprising: a transparent substrate; and a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, wherein a design parameter of the transflective film matches an interface characteristic between the transflective film and the transparent substrate and an interface characteristic between the transflective film and the filter film, the design parameter including at least one of a reflectivity, a transmissivity, and a thickness of the transflective film.

In the windshield of the third aspect, in some embodiments, the transparent substrates include at least two sub transparent substrates and at least one intermediate layer disposed between every two adjacent sub transparent substrates, the transflective film is disposed on the transparent substrates, and the filter film is disposed on the transflective film.

In the windshield of the first, second, or third aspect, in some embodiments, the transflective film is integrally formed with the filter film; and/or, the filter film comprises: a reflective film for the infrared, visible and/or ultraviolet range, or an absorbing film for the infrared, visible and/or ultraviolet range, or a film with scattering action, or a holographic heads-up display film; and/or, the filter film comprises: a carrier film and a coating or liquid crystal disposed on the carrier film; and/or the transflective film is a transflective film with a light filtering function.

In the windshield of the first, second, or third aspect, in some embodiments, the transflective film is a wavelength selective polarizing transflective film, an average reflectance of the transflective film for each of n predetermined wavelength bands of the S-polarized light incident to the transflective film is greater than 60%, and an average transmittance of the transflective film for each of all wavelength bands other than the n predetermined wavelength bands is greater than 60%, where n is a positive integer not less than 1.

According to a fourth aspect of the present disclosure, there is provided a display device including: an image source; and a windscreen as described above arranged to reflect image light emitted by the image source and to transmit ambient light. The display device comprises all the features of the windscreen described above and will not be described in further detail here.

According to a fifth aspect of the present disclosure, there is provided a transportation apparatus including: a display device as hereinbefore described. The traffic device comprises all the features of the above-mentioned windscreen or display device, which are not described in detail here.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, 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 present disclosure may be understood more clearly and in accordance with the following detailed description, taken with reference to the accompanying drawings,

wherein:

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

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

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

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

FIG. 5 is a schematic cross-sectional view showing the structure of a transflective film according to one embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view illustrating the structure of a filter according to one embodiment of the present disclosure;

fig. 7 is a schematic view illustrating a structure of a display device according to an embodiment of the present disclosure;

fig. 8 is a schematic sectional view illustrating a windshield according to an embodiment of the present disclosure.

It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

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 are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar words in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. 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 having an intervening component, or may be directly connected to the other components without having an intervening component.

All terms (including technical or scientific terms) used herein 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 those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

At present, the working principle of the head-up display commonly used in vehicles is to project light to a windshield of the vehicle by using an image source of the head-up display, the windshield is provided with a reflective film for improving the light reflectivity of the image source, and the windshield reflects the incident light to an eye box area of the head-up display.

It is understood here that the area where the observer needs to view the image, i.e. the eye box area (eyebox), may be preset according to actual requirements, and the eye box area refers to an area where both eyes of the observer are located and the image displayed by the display device can be seen, and may be a planar area or a stereoscopic area, for example.

The inventors of the present disclosure found that the imaging effect of the head-up display is not good in some vehicles, and the reason for the poor imaging effect is: the transflective film of the front windshield is designed in the design process of the front windshield according to the characteristics of the glass-air interface, i.e., one side surface of the transflective film is in contact with the glass and the other side surface is in contact with the air. However, after a user purchases a vehicle, the user generally attaches a heat insulation film to the front windshield of the vehicle by himself, and the heat insulation film causes the glass-plastic interface where the transflective film is actually located to be mismatched with the designed glass-air interface, so that the property of the transflective film is affected.

In view of the above findings, embodiments of the present disclosure provide a windshield.

In some embodiments, the windshield includes: a transparent substrate; a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, wherein the transflective film includes at least one first layer and at least one second layer alternately arranged, and a refractive index n of the first layer ₁ In the range of 1.8<n ₁ 2.6 or less, refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ Less than or equal to 1.8. Here, the first layer may also be referred to as a high refractive index layer, and the second layer may also be referred to as a low refractive index layer. Refractive index n of the first layer ₁ And the refractive index n of the second layer ₂ The range of (b) is selected so that the performance of the transflective film is not affected by the application of the filter film thereon.

Fig. 1 is a schematic 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 transflective film 2 and a filter film 3. The transflective film 2 is positioned on the transparent substrate. For example, the transflective film is located on a first side of the transparent substrate. For example, the first side is the inner side of the transparent substrate. That is, the transflective film is located on a surface of the transparent substrate on a side facing the image source provided corresponding to the windshield. The transflective film 2 is configured to reflectA portion of the incident light rays propagating to the transflective film are transmitted and another portion of the incident light rays are transmitted. The transflective film 2 includes at least one first layer and at least one second layer (the first layer and the second layer will be described later with reference to fig. 5) alternately arranged. Refractive index n of the first layer ₁ In the range of 1.8<n ₁ 2.6 or less, refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ Less than or equal to 1.8. This pass through anti-membrane can realize the reflection to the image light that the image source (not shown in figure 1) sent to realize the formation of image of windshield and show, form the virtual image that the user can observe. Meanwhile, the transflective film may realize transmission of external environment light (not shown in fig. 1) so that the external environment may be observed through the windshield, for example, the windshield may be a front windshield of a vehicle. The filter film 3 is located on one side of the transflective film 2. For example, as shown in fig. 1, the filter film 3 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 between the transparent substrate 1 and the filter film 3.

The design parameters of the transflective film are respectively matched with the surface of the transparent substrate and the surface of the filter film. For example, the design parameters may include the arrangement and refractive index of the first and second layers, and the like. For another example, the design parameter may further include a thickness or a number of layers of each of the first layer and the second layer.

It should be noted that the "inner side" or "outer side" referred to in this disclosure 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, if the image source is located on the right side of the transparent substrate (not shown in fig. 1), the right side of the transparent substrate is the inner side of the transparent substrate, and correspondingly, the left side of the transparent substrate is the outer side of the transparent substrate. For example, when the transparent substrate is mounted on a 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 correspondingly, 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 the inner side of the transparent substrate, and the left side of the transparent substrate may be 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 so limited.

For example, fig. 8 is a schematic sectional view illustrating a windshield according to one embodiment of the present disclosure. As shown in fig. 8, the transparent substrate 1 includes a convex outer surface 101 and a concave outer surface 102 opposite to the convex outer surface 101, and the transflective film 2 is located on a side of the concave outer surface 102 away from the convex outer surface 101. Similarly to the foregoing, the design parameters of the transflective film are respectively matched with the surface of the transparent substrate and the surface of the filter film.

It should be noted that, although the windshield shown in fig. 8 does not show a filter, in some embodiments, the windshield shown in fig. 8 may further include a filter on the transflective film 2, so that the transflective film 2 is located between the transparent substrate 1 and the filter.

It is also noted that, in the case where the windshield includes a plurality of transflective films, the plurality of transflective films may include, in addition to the transflective film located on the side of the concave outer surface of the transparent substrate remote from the convex outer surface, a transflective film located between the convex outer surface and the concave outer surface, i.e., a transflective film inside the transparent substrate. Accordingly, the scope of the present disclosure is not limited in this respect.

In some embodiments, the transflective film 2 may be disposed on the transparent substrate 1 by coating or pasting, and the filter film 3 may be disposed on the transflective film 2 by coating or pasting.

In some embodiments, the filter film comprises: reflective films for the infrared, visible and/or ultraviolet range, or absorbing films for the infrared, visible and/or ultraviolet range, or films with a scattering effect, or holographic HUD (Head Up Display) films. For example, the filter film may be a film that is resistant to ultraviolet light or infrared light, or the like.

In the present disclosure, a transflective film refers to a film layer that reflects a portion of light and transmits another portion of light. The transflective film is arranged on the transparent substrate, and can realize the transmission and reflection of light rays, so that light emitted by the image source is incident on the transflective film and is reflected to the eye box area by the transflective film, and the eye box area is a certain area where eyes of an observer are positioned, so that a HUD image is formed; ambient light outside the transparent substrate can also penetrate the transparent substrate at a relatively high transmittance (e.g., 70% or more) and enter the eyes of the observer to form a clear and natural image. Therefore, the observer can view the HUD image and the surrounding environment at the same time.

Up to this point, a windshield according to some embodiments of the present disclosure is described in detail. This windshield includes: a transparent substrate; a transflective film on the transparent substrate, the transflective film including at least one first layer and at least one second layer alternately arranged, the refractive index n of the first layer being ₁ In the range of 1.8<n ₁ 2.6 or less, refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ Less than or equal to 1.8; and the filter film is positioned on one side of the transflective film. For example, the filter film is located on the side of the transflective film away from the transparent substrate. In such a design, the design parameters of the transflective film may be such that the performance of the transflective film is not affected by the application of the filter film thereon.

In addition, the windshield window can realize imaging display, and the filter film is arranged in the windshield window, so that the filtering performance of the windshield window can be improved.

In the windshield shown in fig. 1, the windshield includes a filter, but the scope of the present disclosure is not limited thereto. For example, the windshield may not include the filter before sale. The filter can be any filter. For example, the filter film is a heat insulating film.

In some embodiments, the refractive index of the filter film ranges from 1.2 to 1.8. Here, the refractive index of the filter includes both end points of the range, i.e., 1.2 and 1.8. Therefore, the refractive index range of the filter film is reasonably limited, and the filtering effect of the filter film is improved conveniently.

In the description of the present disclosure, when a range of a certain parameter is described as a to B, it is indicated that the parameter includes both end points of the range, i.e., a and B. Other parameters are similar.

In some embodiments, the refractive index of the filter film ranges from 1.4 to 1.6.

In the above embodiments, the design parameters of the transflective film are respectively matched with the surface of the transparent substrate and the surface of the filter film. For example, in the windshield shown in fig. 1, the transflective film 2 is located between the transparent substrate 1 and the filter film 3. In view of the above, in some embodiments of the present disclosure, the transflective film 2 may be designed according to an interface between the transparent substrate and the filter film (e.g., a glass-plastic interface). That is, the transflective film 2 has design parameters for the interface between the filter film and the glass. For example, the design parameter includes at least one of a reflectance, a transmittance, a thickness, and the number of layers of the refractive index layer of the transflective film. Here, it will be understood by those skilled in the art that both the reflectance and transmittance can be obtained from the refractive index by a calculation method of the related art, and will not be described in detail here. The transflective film is designed to be suitable for the interface between the transparent substrate and the filter film, so that the display function of the windshield is basically not affected after the filter film is attached.

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, refractive index n of the second layer ₂ In the range of 1.3. Ltoreq. N ₂ Less than or equal to 1.6. This not only can improve the reflectivity that the anti-membrane of passing through was set light, can improve the whole transmissivity of anti-membrane to visible light wave band light moreover, very be favorable to the user to watch the demonstration formation of image of the virtual image that image light formed and ambient light simultaneously, can reduce the luminance demand to the image source that sends image light moreover. Moreover, the design and processing of the transflective film can be facilitated, the mass production of the transflective film is realized, and the production cost is reduced.

In some embodiments, the number of layers of the first layer is equal to the number of layers of the second layer, and the number of layers of the first layer is less than or equal to 50. Through the number of piles of setting for first layer, be convenient for reduce in the transparent membrane (for example, S polarized light transparent membrane) the whole number of piles of first layer (high refracting index layer promptly) and second floor (low refracting index layer promptly), the production and processing of the transparent membrane of being convenient for improves production efficiency, is convenient for improve the holistic rete degree of consistency of transparent membrane, improves optical effect.

In some embodiments, the first layer has a thickness in the range of 1nm (nanometers) to 300nm and the second layer has a thickness in the range of 1nm to 300nm. Therefore, the proper thickness range of the first layer can be selected, the inconvenience of processing due to the fact that the thickness of the first layer is too thin is avoided, and the accuracy of the thickness of the first layer can be improved; avoid the thickness of the first layer being too thick resulting in poor uniformity of each layer.

For example, the transflective film may be manufactured by selecting appropriate parameter values from the refractive index, the number of layers, and the thickness of the upper first layer and the first layer so that the transflective film matches the surface of the transparent substrate and the surface of the filter film, that is, matches the interface between the surface of the transparent substrate and the filter film.

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

In other embodiments of the present disclosure, a windshield is provided. This windshield includes: a transparent substrate; and a transflective film on the transparent substrate, configured to reflect a portion of incident light rays propagating to the transflective film, and transmit another portion of the incident light rays, wherein design parameters of the transflective film are matched with characteristics of an interface between the transflective film and the transparent substrate and characteristics of an interface between the transflective film and the filter film, the design parameters including at least one of reflectivity, transmissivity, and thickness of the transflective film. As previously mentioned, those skilled in the art will appreciate that both reflectivity and transmissivity can be derived from the refractive index by prior art calculation methods and will not be described in detail herein. For another example, the design parameters may also include the number of first layers and the number of second layers in the transflective film.

In some embodiments, the transparent substrate includes at least two sub transparent substrates and at least one intermediate layer disposed between every two adjacent sub transparent substrates, a transflective film disposed on the transparent substrate and a filter film disposed on the transflective film.

For example, the transflective film may be an inorganic film and the filter film may be an inorganic film.

In some embodiments, the transflective film has a hardness greater than the hardness of the filter film. The hardness of the sub transparent substrate is greater than the hardness of the transflective film, the light filter film and the intermediate layer. For example, the sub transparent substrate has a hardness of 6H or more, and the transflective film and the filter film each have a hardness of 3H or less.

Based on the same concept as the windshield described above, embodiments of the present disclosure also provide a method of manufacturing a windshield. The manufacturing method comprises the following steps: arranging a transflective film on a transparent substrate, wherein design parameters of the transflective film are determined according to at least the characteristics of an interface between the transflective film and the transparent substrate and the characteristics of an interface between the transflective film and the filter film, and the design parameters comprise at least one of reflectivity, transmissivity and thickness (or at least one of the reflectivity and the thickness) of the transflective film; and a light filter film is arranged, wherein the transflective film is positioned between the light filter film and the transparent substrate.

In some embodiments, the transflective film may be first disposed on the transparent substrate, and then the filter film may be disposed on the transflective film. Alternatively, in other embodiments, the transflective film with the filter film may be disposed on the transparent substrate after the transflective film is disposed on the filter film, wherein the transflective film is located between the transparent substrate and the filter film.

Here, the interface characteristic mainly refers to an abrupt change in material characteristic, for example, an abrupt change in refractive index, between two objects forming an interface (for example, between a transflective film and a transparent substrate, or between a transflective film and a filter film). For example, a sudden entrance of light from a material with a low refractive index into a material with a high refractive index may cause a sudden change in the refractive index.

For example, in the manufacturing process, the transflective film may be disposed on the inner side surface (e.g., the right side surface in fig. 1) of the transparent substrate by means of plating or film-attaching; the user can attach the filter to the transflective film before using the vehicle equipped with the transparent substrate (as a windshield). Because the transflective film is designed according to the interface between the transparent substrate and the filter film, the use of the windshield cannot be affected after the filter film is attached to a user.

In some embodiments, the transflective film is integrally formed with the filter film. Thus, the transflective film can be made to have a filter function. That is, in this embodiment, the transflective film 2 and the filter film 3 in FIG. 1 are integrated into a single layer.

In some embodiments, the transflective film may be a transflective film having a light filtering function.

For example, the transflective film 2 is provided on an inner side surface (e.g., a right side surface in fig. 1) of the transparent substrate 1, the transflective film 2 itself has a filter function, and the transflective film 2 may be designed in accordance with an interface between the transparent substrate and air. The corresponding windshield has a display function and a light filtering function. For example, the transflective film may be disposed on the transparent substrate by means of a plating film or a film-attaching film. In this embodiment, the filter film may not be attached to the transflective film.

For another example, the transflective film 2 is provided on the inner surface (for example, the right side surface in fig. 1) of the transparent substrate 1, the transflective film 2 itself has a light filtering function, the filter 3 is further attached to the transflective film 2, and the transflective film 2 is designed according to the interface between the transparent substrate and the filter (for example, the interface between the glass and the filter), so that the transflective film and the filter have a dual light filtering function.

For example, in the manufacturing process, the transflective film can be arranged on the innermost surface of the transparent substrate by means of film coating or film pasting; the user can paste the filter film on the transflective film before using the vehicle. Because the transflective film is designed according to the relevant parameters of the interface between the transparent substrate and the filter coating, the use of the windshield cannot be influenced after the filter coating is attached by a user.

In other embodiments, the filter is located inside the transparent substrate. Such a structure is described in detail below in conjunction with fig. 2-4, respectively.

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

As shown in fig. 2, the windshield includes: a transparent substrate 1, a transflective film 2 and a filter film 3. The transflective film 2 is positioned on the transparent substrate 1. For example, the transflective film 2 is located on a first side (i.e., an inner side) of the transparent substrate 1. The transflective film 2 is configured to reflect a portion of incident light rays propagating to the transflective film and to transmit another portion of the incident light rays. The design parameters of the transflective film are respectively matched with the surface of the transparent substrate and air. The filter 3 is located inside the transparent substrate 1. For example, the design parameters may include the refractive indices of the various layers of the transflective film, the number of layers, and the like.

For example, the transflective film includes at least one first layer and at least one second layer alternately arranged, the first layer having a refractive index greater than that of the second layer, the number of layers of the first layer being different from the number of layers of the second layer. For example, the number of layers of the first layer is less than the number of layers of the second layer. Such a design can allow the design parameters of the transflective film to be matched to the surface of the transparent substrate and the air, respectively.

In some embodiments, the transparent substrate 1 includes: a plurality of sub-transparent substrates (e.g., glass substrates) arranged in a stack. For example, as shown in fig. 2, 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 closer to the transflective film 2 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. 2 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, e.g., 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. 2, 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 interlayer 13 is a thermoplastic polymer film (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 each 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 embodiments 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 filter film is positioned between at least one of the plurality of sub-transparent substrates and the intermediate layer. For example, as shown in fig. 2, the filter film 3 is located between the second sub transparent substrate 12 and the intermediate layer 13. For example, the filter film is plated or attached on the surface of at least one sub-transparent substrate. This also improves the filtering function of the windshield.

In some embodiments, the filter film is located on a surface of the one sub-transparent substrate. For example, the filter film 3 is located on the surface of the second sub transparent substrate 12.

Thus, there are provided windshield windows of further embodiments. The windshield includes: a transparent substrate; a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, design parameters of the transflective film being matched with a surface of the transparent substrate and air, respectively; and a filter film located inside the transparent substrate. In this embodiment, the transflective film may be designed according to an interface between the transparent substrate and air (e.g., a glass-air interface). For example, the refractive index of the transflective film matches the interface between the transparent substrate and air. The filter film is not arranged on the transflective film, so that the display function of the windshield window is not affected. In addition, the filter film is arranged inside the transparent substrate, so that the filtering function of the windshield is improved.

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

Unlike the windshield shown in fig. 2, in the windshield shown in fig. 3, the filter 3 is located between the first sub transparent substrate 11 and the intermediate layer 13. For example, the filter film 3 is located on the surface of the first sub transparent substrate 11. In this embodiment, the transflective film may be designed according to an interface (e.g., a glass-air interface) between the transparent substrate and air, and since the filter film is not disposed on the transflective film, the display function of the windshield is not affected. In addition, the filter film is arranged inside the transparent substrate, so that the filtering function of the windshield is improved.

In the embodiments of the present disclosure, the surfaces of the first and second sub transparent substrates are referred to as a first surface, a second surface, a third surface, and a fourth surface in order from inside to outside (e.g., from right to left). The filter 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 filter film may be disposed on one of two opposite surfaces of the adjacent two sub transparent substrates.

Fig. 4 is a schematic sectional view illustrating a windshield according to another embodiment of the present disclosure.

Unlike the windshield shown in fig. 2, the windshield shown in fig. 4 has the filter 3 located inside the intermediate layer 13. That is, the filter film may be provided integrally with the intermediate layer. Thus, the processing and the manufacturing of the filter film are convenient. This increases the transmission of the transparent substrate and avoids ghost images due to reflections from the glass-air refractive index mismatch.

For example, during the manufacturing process, the filter may be placed in a mold and then the material of the intermediate layer may be injected into the mold so that the filter is inside the formed intermediate layer.

In the above embodiment, the filter film is disposed inside the transparent substrate, so that the filtering function of the windshield is improved, and the filter film is convenient to process and manufacture.

In addition, the transflective film may be designed according to an interface between the transparent substrate and the air (e.g., a glass-air interface), and since the filter film is not disposed on the transflective film, the display function of the windshield is not affected.

In some embodiments of the present disclosure, the windshield is a front windshield.

As can be seen from fig. 2, 3 and 4, the filter 3 is located on one side of the transflective film 2. Specifically, in these embodiments, the filter film 3 is located on the side of the transflective film 2 close to the second sub-transparent substrate, and is separated from the transflective film 2 by the first sub-transparent substrate 11.

It should be noted that, in the embodiments of the present disclosure, when a portion is described as being located on one side of another component, the one component may be located on a surface of the another component in direct contact with the another component, or may be isolated from the another component without being in direct contact with the another component.

In some embodiments, a ratio of a difference in refractive index between the intermediate layer and each of the plurality of sub transparent substrates to a refractive index of each sub transparent substrate is less than or equal to 50%. That is to say that the temperature of the molten steel,

for example, the ratio of the refractive index difference between the intermediate layer and the first sub transparent substrate to the refractive index of the first sub transparent substrate is less than or equal to 50%, and the ratio of the refractive index difference between the intermediate layer and the second sub transparent substrate to the refractive index of the second sub transparent substrate is less than or equal to 50%. Therefore, the refractive indexes of the middle layer and the sub transparent substrate are relatively close, so that light rays can be transmitted through the transparent substrate, unnecessary reflection of the light rays can be avoided or reduced, and double images can be eliminated or reduced.

The inventors of the present disclosure have also found that the windshield is prone to the problem of ghost images when used as a windshield of a vehicle and for head-up display.

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 at the outer side, which can reduce the occurrence of the ghost.

In some embodiments, at least one of the first sub transparent substrate, the second sub transparent substrate, and the intermediate layer is wedge-shaped. For example, the first sub transparent substrate 11 is a wedge-shaped sub transparent substrate. That is, the shape of the inner sub transparent substrate is a wedge-shaped plate, for example, after the first sub transparent substrate 11 is mounted on the vehicle, the thickness of the first sub transparent substrate 11 gradually decreases from top to bottom. This may also have the effect of reducing the occurrence of ghosting.

In some embodiments, the intermediate layer 13 is a wedge-shaped intermediate layer. That is, the intermediate layer is in the shape of a wedge-shaped plate, for example, the thickness of the intermediate layer gradually decreases from top to bottom after the intermediate layer is mounted to the vehicle. This may also have the effect of reducing the occurrence of ghosting.

In other embodiments of the present disclosure, a method of manufacturing a windshield is also provided. The manufacturing method comprises the following steps: providing a transparent substrate, wherein a filter film is arranged inside the transparent substrate; and disposing a transflective film on the transparent substrate, wherein design parameters of the transflective film are determined according to at least interface characteristics between the transflective film and the transparent substrate and interface characteristics between the transflective film and air, the design parameters including at least one of a reflectance, a transmittance, and a thickness of the transflective film. Here, the interface characteristic refers to an abrupt change in material characteristic, for example, an abrupt change in refractive index, between two objects forming an interface (for example, between a transflective film and a transparent substrate, or between a transflective film and air). For example, a sudden entrance of light from a material with a low refractive index into a material with a high refractive index may cause a sudden change in the refractive index.

The transflective film is described in detail below.

In some embodiments, the transflective film is a polarizing transflective film.

For example, the transflective film may be a wavelength selective polarizing transflective film, such as an RGB polarizing transflective film.

For example, the transflective film has an average reflectance of greater than 60% for each of n predetermined wavelength bands of S-polarized light incident on the transflective film, and an average transmittance of greater than 60% for each of all wavelength bands other than the n predetermined wavelength bands, where n is a positive integer not less than 1. For example, n is 3. For example, the n predetermined bands include: a red polarized light band, a green polarized light band, and a blue polarized light band.

For example, the image source may emit S-polarized light having at least 3 predetermined wavelength bands; the transflective film has an average reflectivity of greater than 60% for the at least 3 predetermined bands of S-polarized light. Preferably, the transflective film has an average transmittance of more than 60% for the S-polarized light in a wavelength band outside the at least 3 predetermined wavelength bands, where "for the wavelength band outside the at least 3 predetermined wavelength bands" may include a wavelength band outside the at least 3 predetermined wavelength bands of the S-polarized light and a full wavelength band of the P-polarized light. Specifically, the image source may be formed by a single color or a plurality of single-color wave packet distributions which are superposed. For example, in order to achieve the same visual effect as that of a full-spectrum source, n is 3, and S-polarized light emitted by the image source can be formed by overlapping three wave packet distributions of red (630 nm (nanometer) ± 40 nm), green (540 nm ± 20 nm), and blue (450 nm ± 40 nm). The transflective film has an average reflectance of greater than 60% for red, green, and blue polarized light. Preferably, the transflective film has an average transmittance of more than 60% for S-polarized light in a wavelength band other than red, green and blue for the S-polarized light.

In some embodiments, the transflective film is a polarizing transflective film for reflecting light of a first polarization and transmitting light of a second polarization. Where the first polarization is different from the second polarization. For example, the first polarized light is S polarized light, and the second polarized light is P polarized light; alternatively, the first polarized light is P-polarized light and the second polarized light is S-polarized light. The polarization transflective film includes: the light source device includes a first polarization transflective film for reflecting S-polarized light and transmitting P-polarized light, or a second polarization transflective film for reflecting P-polarized light and transmitting S-polarized light.

Here, it is understood that when the transflective film is an S-polarized light transflective film, the reflectance for S-polarized light is set to be greater than the reflectance for P-polarized light.

In some embodiments, the polarizing transflective film may include a plurality of first layers and second layers alternately stacked, the first layers having a refractive index greater than that of the second layers. The first layer may also be referred to as a high refractive index layer and the second layer may also be referred to as a low refractive index layer. In the laminated structure of the transflective film, the first layer/the second layer (high refractive index layer/low refractive index layer) is sequentially deposited from the surface of the transparent substrate outward.

It should be noted that the first layers in different layers may have the same refractive index, or may have different refractive indices; the second layers at different layers may have the same refractive index or may have different refractive indices.

In some embodiments, in the stacked structure of the transflective film, the first layer may have a thickness of 50nm to 100nm, and the second layer may have a thickness of 80nm to 120nm. However, the scope of the present disclosure is not limited thereto.

In other embodiments, the transflective film is a wavelength selective transflective film that reflects certain wavelength bands of light and transmits other wavelength bands of light.

Fig. 5 is a schematic cross-sectional view illustrating a structure of a transflective film according to one embodiment of the present disclosure. The structure of the transflective film will be described in detail below, taking the transflective film shown in fig. 5 as an example.

As shown in fig. 5, the transflective film 2 includes a stacked structure of two first/second layers, i.e., a first layer 211, a second layer 221, a first layer 212, and a second layer 222 are sequentially deposited from the surface of the transparent substrate outward. In order to distinguish the different refractive index layers, the first layer 211 is referred to 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 other embodiments, first high refractive index layer 211 has a thickness of 5 nm to 35 nm, first low refractive index layer 221 has a thickness of 5 nm to 35 nm, second high refractive index layer 212 has a thickness of 20nm to 50nm, and second low refractive index layer 222 has a thickness of 80nm to 130 nm.

Although fig. 5 illustrates a two first layer/second layer stack structure, those skilled in the art will appreciate that the scope of the present disclosure is not so limited. For example, the transflective film may be provided according to actual needs such that the transflective film includes a laminate structure of two, three or even more first/second layers. That is, the transflective film may include a plurality of first layers and second layers alternately stacked.

In the case where the transflective 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, where the transflective film includes a plurality of second layers, the refractive indices of the plurality of second layers may all be the same, or partially the same, or different altogether. For example, the refractive indices of first low refractive index layer 221 and second low refractive index layer 222 may be the same or different.

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 (which may be referred to as first portions) having different refractive indices; 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 (may be referred to as second portions) whose refractive indices are different.

In some embodiments, the polarizing transflective film is a transparent nanofilm with P-polarizing reflectivity, which may be referred to as a P-polarizing transflective film (e.g., a second polarizing transflective film).

In some embodiments, for a P-polarizing transflective film, the materials of the first layer (high refractive index layer) include: an oxide of Zn (zinc), sn (tin), ti (titanium), nb (niobium), zr (zirconium), ni (nickel), in (indium), al (aluminum), ce (cerium), W (tungsten), mo (molybdenum), sb (antimony), bi (bismuth), or a mixture thereof, or at least one of a nitride, oxynitride, or a mixture thereof of Si (silicon), al, zr, Y (yttrium), ce, la (lanthanum).

In some embodiments, for a P-polarizing transflective film, the material of the second layer (low refractive index layer) comprises: at least one of an oxide, oxynitride, or mixture thereof of Si or Al.

In some embodiments, the first and second layers may be deposited using physical vapor deposition (e.g., evaporation, sputtering, etc.) methods known to those skilled in the art or 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: the original piece of glass (for example, the glass can be used as a transparent substrate) of the glass plate enters a sputtering coating production line provided with a plurality of coating cathodes after the procedures of pretreatment, cleaning and the like, and each film layer is designed and sequentially deposited according to the laminated structure and the thickness of the first layer/the second layer; after the film coating is finished, performing high-temperature forming, laminating and the like; the low surface energy film layer may then be applied to the surface of the first/second layer laminate either before or after lamination, which may include steps of surface cleaning, coating (e.g., spraying, dipping, painting, etc.), drying, etc.

In some embodiments, the polarizing transflective film is a film layer having S-polarization reflectivity (e.g., a first polarizing transflective film), and the material of the S-polarization reflectivity film layer may include: 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 a mixture thereof. The first polarizing transflective film may be stacked with a plurality of films having different refractive indices.

The first polarization transflective film has a high reflectivity for S-polarized light of a specific wavelength band or bands and a low reflectivity for S-polarized light of other wavelength bands and all P-polarized light through an interference effect, so that a high transmittance is obtained.

Thus far, transflective films according to some embodiments of the present disclosure are described.

Fig. 6 is a schematic cross-sectional view illustrating a structure of a filter film according to one embodiment of the present disclosure.

In some embodiments, as shown in fig. 6, the filter film 3 includes: a carrier film 310 and a coating or liquid crystal 320 disposed on the carrier film 310.

In some embodiments, the thickness of the filter film is 50 μm (micrometers) to 300 μm. Illustratively, the thickness of the filter film is 50 μm to 100 μm. The thickness of the filter film is, for example, 50 μm or 100 μm.

For example, the filter film is a reflective film in the infrared light range (e.g., XIR film), or includes such a film. The filter may include: a carrier film and a coating (e.g., a coating that reflects infrared light) disposed on the carrier film. Optionally, the carrier film comprises: at least one of polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polymethyl methacrylate (PMMA), or mixtures or copolymers or derivatives thereof. For example, the carrier film may be a PET film. For another example, the carrier film may comprise cellulose acetate (also known as triacetate). Such a film containing Cellulose acetate is also called TAC (Triacetyl Cellulose) film. In some embodiments, the thickness of the carrier film is 5 μm (micrometers) to 500 μm. Preferably, the thickness of the carrier film is from 10 μm to 200 μm, for example 50 μm or 75 μm or 100 μm. The thickness of the coating (e.g., a coating that reflects infrared light) is less than or equal to 1 μm. The coating may be selected to be relatively thin.

In other embodiments, the filter film may be a film having a scattering effect or a functional element including a film having a scattering effect. The filter may include: a carrier film and a liquid crystal disposed on a surface of the carrier film. The carrier film may comprise at least one of polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), polymethyl methacrylate (PMMA) or mixtures or copolymers or derivatives thereof. For example, the carrier film may be a PET film. For another example, the carrier film may comprise cellulose acetate. Such films comprising cellulose acetate are also known as TAC films. In some embodiments, the thickness of the carrier film is from 5 μm (micrometers) to 500 μm thick. Preferably, the thickness of the carrier film is from 10 μm to 200 μm, for example 50 μm or 75 μm or 100 μm.

In other embodiments, the filter may be or include a controllable functional element. The controllable functional element may comprise an active layer (e.g. liquid crystal, etc.) between two surface electrodes. The active layer has controllable optical properties that can be controlled by a voltage applied to the surface electrode. The surface electrode and the active layer may be arranged in a manner substantially parallel to the surface of the transparent substrate. The surface electrodes are electrically connected to an external voltage source in a manner known to those skilled in the art. The surface electrodes may be electrically contacted to an external voltage source via a suitable connecting cable, such as a membrane conductor. The connection cable is optionally connected to the surface electrodes via so-called busbars, for example strips of conductive material or conductive prints. The surface electrodes can be designed as transparent conductive layers. The surface electrode may comprise at least one metal, metal alloy or transparent conducting oxide (TCO for short). The surface electrode may comprise, for example, at least one of silver, gold, copper, nickel, chromium, tungsten, indium Tin Oxide (ITO), gallium-doped or aluminum-doped zinc oxide, or fluorine-doped or antimony-doped tin oxide. For example, the thickness of the surface electrode may be 10nm to 2 μm. Preferably, the surface electrode has a thickness of 20nm to 1 μm. More preferably, the thickness of the surface electrode is 30nm to 500nm.

In addition to the active layer and the surface electrodes, the controllable functional elements can also have further layers known to the person skilled in the art, for example barrier layers (barrierschten), barrier layers (blockerschten), antireflection layers, protective layers and/or smoothing layers, etc.

Fig. 7 is a schematic view illustrating a structure of a display device according to an embodiment of the present disclosure.

In some embodiments, as shown in fig. 7, the display device includes: an image source 110 and a windshield 120. The windshield is configured to reflect image light emitted by the image source and transmit ambient light. As shown in fig. 7, the windshield 120 may include an imaging window 122. The image source may comprise a projection device (e.g., a projector) directed towards the imaging window 122 of the windscreen. The image source may emit S-polarized light or P-polarized light.

As shown in fig. 7, 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 to form an eye box area 140, so that an observer (e.g., a driver) can view an imaging picture 130, which is a virtual image, in the eye box area 140 along a direction of a reverse extension line of the image light.

In some embodiments of the present disclosure, a transportation device is also provided. The transportation device includes the display device described above, such as the display device shown in fig. 7. For example, the display device is a head-up display device. For example, a windshield in a display device is a windshield of a traffic equipment. For example, the vehicle device may be various suitable vehicles, and may include, for example, various types of land vehicle devices such as automobiles, or may be a water vehicle device such as a boat, or the like, as long as a front window is provided at a driving position thereof 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. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. Those skilled in the art can now fully appreciate how to implement the teachings disclosed herein, in view of the foregoing 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 foregoing examples are for purposes of 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 various changes may be made and equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (18)

1. A windshield, comprising:

a transparent substrate;

a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, wherein the transflective film includes at least one first layer and at least one second layer alternately arranged, and a refractive index n of the first layer is ₁ In the range of 1.8<n ₁ 2.6 or less, the refractive index n of the second layer ₂ In the range of 1.2. Ltoreq. N ₂ ≤1.8。

2. The windshield according to claim 1, further comprising:

and the light filter film is positioned on one side of the transflective film.

3. The windshield according to claim 2, wherein:

the filter film is positioned on the surface of one side of the transflective film, which is far away from the transparent substrate; and/or the presence of a gas in the gas,

the refractive index range of the filter film is 1.2-1.8, and the design parameters of the transflective film are respectively matched with the surface of the transparent substrate and the surface of the filter film.

4. The windshield of claim 2, wherein the refractive index of the filter film is in a range of 1.4 to 1.6, and the design parameters of the transflective film are matched to the surface of the transparent substrate and the surface of the filter film, respectively.

5. The windshield according to any one of claims 1-4, 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 Less than or equal to 1.6; and/or the presence of a gas in the gas,

the number of the first layers is equal to that of the second layers, and the number of the first layers is less than or equal to 50; and/or the presence of a gas in the atmosphere,

the thickness of the first layer ranges from 1nm to 300nm, and the thickness of the second layer ranges from 1nm to 300nm; and/or the presence of a gas in the gas,

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

6. The windshield of any of claims 1-4, wherein the transparent substrate comprises a first sub transparent substrate, a second sub transparent substrate, and an intermediate layer between the first sub transparent substrate and the second sub transparent substrate, wherein the first sub transparent substrate is closer to the transflective film than the second sub transparent substrate, the first sub transparent substrate has a thickness less 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.

7. The windshield of any of claims 1-4, wherein the transparent substrate comprises a convex outer surface and a concave outer surface opposite the convex outer surface, and the transflective film is positioned on a side of the concave outer surface away from the convex outer surface.

8. The windshield according to any one of claims 2 to 4, wherein:

the transflective film and the light filter film are integrally formed; and/or the presence of a gas in the gas,

the filter film comprises: a reflective film for the infrared, visible and/or ultraviolet range, or an absorbing film for the infrared, visible and/or ultraviolet range, or a film with scattering action, or a holographic heads-up display film; and/or the presence of a gas in the gas,

the filter film comprises: a carrier film and a coating or liquid crystal disposed on the carrier film; and/or the presence of a gas in the atmosphere,

the transflective film is a transflective film with a light filtering function.

9. The windshield according to any one of claims 1 to 4, wherein the transflective film is a wavelength selective polarizing transflective film, the transflective film has an average reflectance of more than 60% for each of n predetermined wavelength bands of S-polarized light incident to the transflective film, and the transflective film has an average transmittance of more than 60% for each of all wavelength bands other than the n predetermined wavelength bands, where n is a positive integer of not less than 1.

10. A windshield, comprising:

a transparent substrate;

a transflective film on the transparent substrate, configured to reflect a portion of incident light propagating to the transflective film and transmit another portion of the incident light, design parameters of the transflective film being respectively matched with a surface of the transparent substrate and air; and

and the filter film is positioned inside the transparent substrate.

11. The windscreen according to claim 10,

the transflective film comprises at least one first layer and at least one second layer which are alternately arranged, the refractive index of the first layer is greater than that of the second layer, and the number of the first layer is not equal to that of the second layer.

12. The windscreen according to claim 10 or 11, wherein said transparent substrate comprises:

a plurality of sub transparent substrates arranged in a stack; and

the middle layer is arranged between every two adjacent sub transparent substrates in the sub transparent substrates, and the filter film is positioned between at least one sub transparent substrate in the sub transparent substrates and the middle layer.

13. Windscreen according to claim 12,

the filter coating is plated or attached on the surface of the at least one sub transparent substrate; and/or the presence of a gas in the atmosphere,

a ratio of a refractive index difference between the intermediate layer and each of the plurality of sub transparent substrates to a refractive index of each of the sub transparent substrates is less than or equal to 50%.

14. The windscreen according to claim 10 or 11, wherein said transparent substrate comprises:

a plurality of sub transparent substrates arranged in a stack; and

the middle layer is arranged between every two adjacent sub-transparent substrates in the sub-transparent substrates, and the filter film is positioned inside the middle layer.

15. A windshield, comprising:

a transparent substrate; and

a transflective film on the transparent substrate, configured to reflect a portion of incident light rays propagating to the transflective film and transmit another portion of the incident light rays, wherein a design parameter of the transflective film matches with an interface characteristic between the transflective film and the transparent substrate and an interface characteristic between the transflective film and the filter film, the design parameter including at least one of a reflectivity, a transmissivity, and a thickness of the transflective film.

16. The windscreen according to claim 15, wherein: the transparent substrate comprises at least two sub transparent substrates and at least one middle layer, the middle layer is arranged between every two adjacent sub transparent substrates, the transparent substrate is provided with the transflective film, and the transflective film is provided with the light filter film.

17. A display device, comprising:

an image source; and

the windscreen of any one of claims 1 through 16, wherein the windscreen is configured to reflect image light emitted by the image source and transmit ambient light.

18. A transportation device, comprising: the display device of claim 17.

Images