Reflector, head-up display system and vehicle

Abstract

The invention relates to the technical field of head-up displays, in particular to a reflecting part, a head-up display system and a vehicle. The reflecting part comprises a first substrate and a first transflective film, the first substrate is at least one of a side window and an awning window of the vehicle, and the reflectivity of the first transflective film to the first polarized light is larger than that of the first transflective film to the second polarized light. The first transflective film can be arranged on windows on two sides of the front row of the vehicle, windows on two sides of the rear row of the vehicle, and windshields on the sunscreen glass of the vehicle, so that the multifunctionality and entertainment of the head-up display system are improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of head-up displays, and in particular to a reflector, a head-up display system and a vehicle. Background Art

[0002] 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.

[0003] However, as entertainment systems in motor vehicles become more and more popular, there is a need to increase the versatility and entertainment of HUDs. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a reflector, a head-up display system and a vehicle.

[0005] The present disclosure provides a reflective member, comprising a first substrate and a first transflective film, wherein the first substrate is at least one of a side window and a skylight window of a vehicle, and the reflectivity of the first transflective film to a first polarized light is greater than the reflectivity to a second polarized light.

[0006] Optionally, the first transflective film is arranged on the surface of the first substrate and / or inside the first substrate, and the first transflective film includes a first film layer portion and a second film layer portion which are stacked, the first film layer portion is located at least on one side of the second film layer portion, the first film layer portion includes a first dielectric layer or a second dielectric layer or first dielectric layers and second dielectric layers which are alternately arranged, the second film layer portion includes a metal layer and the first dielectric layer and / or the second dielectric layer which are arranged on both sides of the metal layer, and the refractive index of the first dielectric layer is not equal to the refractive index of the second dielectric layer.

[0007] Optionally, the first polarized light is P polarized light, the second polarized light is S polarized light, and when the first transflective film is within the first incident angle range, within at least half of the wavelength range of 390-780nm, the reflectivity of the first transflective film to the first polarized light is greater than or equal to 20%, and the reflectivity to the second polarized light is less than 20%.

[0008] Optionally, when the first transflective film is within the second incident angle range, the reflectivity fluctuation range of the first polarized light within the wavelength range of 390-780 nm is less than 30%.

[0009] Optionally, when the first reflective film is within a third incident angle range, the average reflectivity of the first polarized light in the wavelength range of 420-490nm is a first reflectivity, the average reflectivity of the first polarized light in the wavelength range of 500-560nm is a second reflectivity, and the average reflectivity of the first polarized light in the wavelength range of 580-630nm is a third reflectivity, wherein the difference between the first reflectivity, the second reflectivity and the third reflectivity is less than or equal to 10%.

[0010] Optionally, the refractive index of the first medium layer is greater than or equal to 2.0, and the refractive index of the second medium layer is less than or equal to 1.7; and / or,

[0011] The number of the first dielectric layers in the first film layer portion is less than or equal to 10, and the number of the second dielectric layers is less than or equal to 10.

[0012] Optionally, the thickness of the first dielectric layer in the first film layer portion is between 10 nm and 100 nm, and the thickness of the second dielectric layer in the first film layer portion is between 15 nm and 150 nm.

[0013] Optionally, the minimum thickness of the first dielectric layer in the first film layer portion is smaller than the minimum thickness of the second dielectric layer in the first film layer portion, and / or the maximum thickness of the first dielectric layer in the first film layer portion is smaller than the maximum thickness of the second dielectric layer in the first film layer portion.

[0014] Optionally, the thickness of the first dielectric layer or the second dielectric layer in the second film layer portion gradually decreases in a direction away from the first film layer portion.

[0015] Optionally, the metal layer includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer and an aluminum reflective layer; and / or the single layer thickness of the metal layer is 1 nm to 50 nm.

[0016] Optionally, the second film layer portion further includes a supporting layer, wherein the supporting layer is in contact with the metal layer and is located on at least one side of the metal layer.

[0017] Optionally, the total number of layers of the first transflective film is less than or equal to 30, and / or the total thickness of the first transflective film is between 100 nm and 800 nm.

[0018] The present disclosure provides a head-up display system, including:

[0019] A head-up display, the head-up display comprising an image source, the image source being used to emit image light;

[0020] A first external reflector, wherein the first external reflector is any one of the reflectors described above, and the first external reflector reflects the image light to an eye box area to form a virtual image.

[0021] Optionally, it further includes a second external reflective member, wherein the second external reflective member includes a front windshield of the vehicle, and the second external reflective member includes a second substrate and a second transflective film.

[0022] The embodiments of the present disclosure also provide a means of transportation, comprising a reflective element as described in any one of the above items; or, comprising a head-up display system as described in any one of the above items.

[0023] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0024] The reflective member provided in the embodiment of the present disclosure includes a first substrate and a first transflective film, the first substrate is at least one of the side windows and the skylight window of the vehicle, and the reflectivity of the first transflective film to the first polarized light is greater than the reflectivity to the second polarized light. The first transflective film can be set on the windshield of the side windows of the front row of the vehicle, the side windows of the rear row of the vehicle, the skylight window of the vehicle, etc., so that the user can view the virtual image displayed by the head-up display system through the side windows or the skylight window, etc., increasing the versatility and entertainment of the head-up display system and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 It is a schematic diagram of the structure of the first transflective film according to the embodiment of the present disclosure.

[0028] Figure 2 A schematic diagram of the structure of a head-up display system provided in an embodiment of the present disclosure.

[0029] Among them, 1, the first film layer part; 2, the second film layer part; 101, the first dielectric layer; 102, the second dielectric layer; 201, the metal layer; 202, the supporting layer; 10, the first transflective film; 20, the first external reflective element; 30, the image source; 40, the virtual image. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0032] like Figure 1 As shown, the embodiment of the present disclosure provides a reflective member, including a first substrate and a first transflective film, the first substrate being, for example, glass or resin, for example, the first substrate being at least one of the side windows and skylight windows of the vehicle, so that the user can see the virtual image displayed by the head-up display system through the side windows or skylight windows, etc., thereby increasing the versatility and entertainment of the head-up display system and improving the user experience. In addition, the reflectivity of the first transflective film to the first polarized light is greater than the reflectivity to the second polarized light. The first transflective film has a higher reflectivity to the first polarized light and a lower reflectivity to the second polarized light, and is applied to the head-up display system. According to the polarization type of the image light (such as P polarized light or S polarized light), the reflectivity of the image light is increased by using the corresponding first transflective film, thereby facilitating the improvement of the display brightness and display effect of the image.

[0033] The first transflective film is set on the side window or skylight window of the vehicle, and the image light is reflected by the first transflective film. The reflective member can be installed at the side window, skylight window and other positions of the vehicle, thereby improving the entertainment of vehicle driving.

[0034] A head-up display system comprises a head-up display and the above-mentioned reflective element, wherein a first transflective film is arranged on the surface of a substrate and / or inside the substrate, and the first transflective film comprises a first film layer portion 1 and a second film layer portion 2 which are stacked, the first film layer portion 1 is at least located on one side of the second film layer portion 2, the first film layer portion 1 comprises a first dielectric layer (101) or a second dielectric layer (102) or a first dielectric layer 101 and a second dielectric layer 102 which are alternately arranged, the second film layer portion 2 comprises a metal layer 201 and the first dielectric layer 101 and / or the second dielectric layer 102 which are arranged on both sides of the metal layer 201, and the refractive index of the first dielectric layer 101 is not equal to the refractive index of the second dielectric layer 102.

[0035] For example, the refractive index of the first dielectric layer 101 is greater than the refractive index of the second dielectric layer 102 .

[0036] When the first polarized light is incident on the transflective film at a large angle, the generation of ghosting can be reduced or eliminated. For example, the transflective film is arranged at the left windshield of the vehicle, and the head-up display device includes an image generation unit. When the first polarized light emitted by the image generation unit is P polarized light, when the image light with P polarization characteristics is incident on the windshield at a certain angle in a large incident angle range, a part of the P polarized light incident on the transflective film will become S polarized light. Since the reflectivity of S polarized light is relatively high, the reflectivity of this part of S polarized light on the windshield becomes higher, so that the virtual image generated by the head-up display device through the reflection of the transflective film produces a relatively obvious ghosting, thereby affecting the clarity of the virtual image and affecting the speed and accuracy of the user reading information. For example, the "large incident angle range" mentioned above can be 20 degrees to 70 degrees, and the certain angle can be 20 degrees or 70 degrees.

[0037] The thickness of the metal layer 201, the first sub-medium layer 101 and the second sub-medium layer 102 are all in nanometer level, and the first transflective film has high light transmittance. With such a configuration, when the transflective film is applied to a head-up display system and a vehicle, it will not prevent the user from seeing the target object in the external environment clearly.

[0038] For example, the first substrate may be a windshield at the side windows of the front row of the vehicle, the side windows of the rear row of the vehicle, the skylight window of the vehicle, etc. The first transflective film may cover the entire window or a part of the window. For example, the windshield is a laminated glass for automobiles, which is composed of an outer glass plate, an inner glass plate and an intermediate film arranged between these glass plates. The first transflective film may be arranged on the surface of the laminated windshield or inside the laminated windshield (i.e., the surface of the inner glass plate close to the intermediate film or the surface of the outer glass plate close to the intermediate film), or in the middle layer of the laminated glass. Preferably, the first transflective film is plated on the surface of the inner glass plate facing the user.

[0039] The polarization characteristics of the image light reflected by the first transflective film correspond to the polarization characteristics of the image light emitted by the image source. The image source of the head-up display emits S-polarized light, and the reflectivity of the S-polarized light reflected by the first transflective film is higher; or, the image source emits P-polarized light, and the reflectivity of the P-polarized light reflected by the first transflective film is higher; or, the image source emits S-polarized light + P-polarized light, and the reflectivity of the S-polarized light reflected by the first transflective film is higher or the reflectivity of the P-polarized light reflected by the first transflective film is higher. P-polarized light and S-polarized light are two different polarized lights. S-polarized light refers to polarized light whose vibration direction is perpendicular to the incident plane, also known as transverse polarized light, and P-polarized light refers to polarized light whose vibration direction is parallel to the incident plane, also known as longitudinal polarized light.

[0040] If the image source includes a liquid crystal screen, the image source emits P-polarized light, and the first transflective film is a P-light transflective film, which can reflect both P-polarized light and S-polarized light, and the first transflective film is limited to have a higher reflectivity for P-polarized light and a lower reflectivity for S-polarized light, for example, the reflectivity of the first transflective film for P-polarized light is greater than the reflectivity of the first transflective film for S-polarized light. In this way, when the image light of the image source is P-polarized light, the display effect and display brightness of the image can be improved, and it is also beneficial to eliminate ghosting. Moreover, at a large angle of incidence, the generation of ghosting can be reduced or eliminated.

[0041] The imaging light emitted by the image source of the head-up display can be incident on a reflective member (such as a windshield on the right side of the front row), thereby forming an image using the reflective member.

[0042] The head-up display may include one or more reflective elements, which may be curved mirrors or plane mirrors, and at least one reflective element is a curved mirror; that is, the head-up display includes one or more curved mirrors, or includes a curved mirror and a plane mirror, or includes a curved mirror and multiple plane mirrors, etc. Specifically, the curved mirror may be a free-form mirror, a spherical mirror, a hyperbolic mirror, a parabolic mirror, etc.

[0043] Specifically, the image source can emit light with specific polarization characteristics. For example, an LCD (Liquid Crystal Display) image source can emit linearly polarized light with a specific polarization direction. A DLP (Digital Light Processing) image source, an image source composed of a diffuser and a backlight module, etc. can all emit specific polarized light.

[0044] For example, the imaging light emitted by the image source can be linearly polarized light of RGB three colors, that is, the image light at this time includes three spectral bands, and the light of each spectral band is linearly polarized light of P polarization. The RGB color mode is a color standard in the industry. It obtains various colors by changing the three color channels of red (R), green (G), and blue (B) and superimposing them on each other. RGB represents the colors of the three channels of red, green, and blue. This standard includes almost all colors that can be perceived by human vision and is one of the most widely used color systems.

[0045] In the disclosed embodiment, an alternating structure of high and low refractive index dielectric layers, that is, a combination of parameters such as the number of high and low refractive index layers and the thickness variation of each layer is used to adjust so as to obtain a higher P-polarized light reflectivity and a lower S-polarized light reflectivity. As a result, the reflectivity of the vehicle glass provided with a P-polarized light transflective film to the incident P-polarized light can be greatly improved, and the reflectivity to the incident S-polarized light can be reduced. As a result, the generation of ghosting can be reduced or eliminated at a wide range of incident angles. This improves the clarity of the image on the vehicle glass and enhances the user experience. Furthermore, the first transflective film can be provided on the side windows of the front row of the vehicle, the side windows of the rear row of the vehicle, the windshield of the vehicle's skylight glass, etc., to increase the versatility and entertainment of the head-up display system and enhance the user experience.

[0046] Further, in some embodiments of the present disclosure, the first polarized light is P polarized light, the second polarized light is S polarized light, and when the first transflective film is in the first incident angle range, within at least half of the wavelength range of 390nm to 780nm, the reflectivity of the first transflective film to the first polarized light is greater than or equal to 20%, and the reflectivity to the second polarized light is less than 20%. The first transflective film of this scheme can ensure that the reflectivity of p-polarized light is above 20% when the first incident angle range is 20 degrees to 70 degrees. For example, when the incident angle of P polarized light of the first transflective film of this scheme is 60 degrees, within at least half of the wavelength range of visible light, the reflectivity of P polarized light is greater than 30%, and the reflectivity of S polarized light is less than 20%.

[0047] For example, when the incident angle of P polarized light is 50 degrees, the reflectivity of P polarized light is greater than 25% and the reflectivity of S polarized light is less than 20% in at least half of the wavelength range of visible light. For example, when the incident angle of P polarized light is 60 degrees, the reflectivity of P polarized light is greater than 30% in the wavelength range of 400-700nm and the reflectivity of S polarized light is less than 25% in the wavelength range of 450-600nm.

[0048] It can be understood here that the incident angle of the head-up display device is a fixed preset angle when in use, for example, the incident angle is 50 degrees or 60 degrees; under different use conditions (for example, in different vehicles), the incident angle can be adjusted, for example, the incident angle is 50 degrees in the first vehicle and 60 degrees in the second vehicle. Within the first incident angle range, any incident angle of any value can meet the requirements of the first transflective film of the present disclosure for the reflectivity of polarized light.

[0049] For example, when the first transflective film is within the second incident angle range, the reflectivity fluctuation range of the first polarized light within the range of 390nm to 780nm is less than 30%.

[0050] Among them, the second incident angle range is less than or equal to the first incident angle range, and it is within the first incident angle range, that is, the second incident angle range is included in the first incident angle range. For example, if the first incident angle range is: 20°~70°, then the second incident angle range can be 20°~70°, or 20°~50°, or 50°~70°. The reflectivity fluctuation range refers to the difference between the maximum and minimum reflectivity of the transflective film to P polarized light within the visible light range within the second incident angle range.

[0051] Exemplarily, when the incident angle is 60°, in the visible light range (wavelength range of 390nm to 780nm), the fluctuation range of the reflectivity of the transflective film to P polarized light is less than 10%, and in the wavelength range of 400nm to 600nm, the fluctuation range of the reflectivity of the transflective film to P polarized light is less than 5%.

[0052] For example, when the first transflective film is within the third incident angle range, the average reflectivity of the first polarized light in the wavelength range of 420-490nm is a first reflectivity, the average reflectivity of the first polarized light in the wavelength range of 500-560nm is a second reflectivity, and the average reflectivity of the first polarized light in the wavelength range of 580-630nm is a third reflectivity, wherein the difference between the first reflectivity, the second reflectivity and the third reflectivity is less than or equal to 10%.

[0053] The third incident angle range is less than or equal to the first incident angle range, and is within the first incident angle range, that is, the third incident angle range is included in the first incident angle range. For example, if the first incident angle range is: 20° to 70°, then the third incident angle range can be 20° to 70°, or 50° to 65°, or 50° to 70°.

[0054] Among them, 420nm to 490nm corresponds to the wavelength range of blue light, 500nm to 560nm corresponds to the wavelength range of green light, and 580nm to 630nm corresponds to the wavelength range of red light. In this way, in different wavelength ranges, the difference in reflectivity of the transflective film to P polarized light is small, that is, the difference in reflectivity to light of different colors is small, and after the image light is reflected by the first transflective film, the color of the image light will not change significantly, which can prevent the image light from color deviation.

[0055] Exemplarily, when the incident angle of the image light is 50°, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 29%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 29%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 29%±2%. When the incident angle of the image light is 55°, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 30%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 30%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 30%±2%. When the incident angle of the image light is 60 degrees, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 34%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 34%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 34%±2%. When the incident angle of the image light is 65 degrees, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 41%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 41%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 41%±2%.

[0056] For example, for the first transflective film of the present embodiment, when the incident angle is 60 degrees, the fluctuation range of the p-polarized light reflectivity in the visible light range is less than 10%, and in the range of 400-600nm, the fluctuation range of the p-polarized light reflectivity is less than 5%.

[0057] That is to say, in order to solve the color deviation problem, when the incident angle of the image light is 60°, the reflectivity of the blue area 420-490nm is set to 34%±2%, the reflectivity of the green area 500-560nm is set to 34%±2%, and the reflectivity of the red area 580-630nm is set to 34%±2%. In order to solve the color deviation problem, when the incident angle of the image light is 50 degrees, the reflectivity of the blue area, green area and red area is set to 29%±2% respectively; when the incident angle of the image light is 55 degrees, the reflectivity of the blue area, green area and red area is set to 30%±2% respectively; when the incident angle of the image light is 65 degrees, the reflectivity of the blue area, green area and red area is set to 41%±2% respectively.

[0058] Further, in some embodiments of the present disclosure, the refractive index of the first dielectric layer 101 is greater than the refractive index of the second dielectric layer 102. Specifically, the refractive index of the first dielectric layer 101 is greater than or equal to 2.0, and the refractive index of the second dielectric layer is less than or equal to 1.7. The refractive index of the first dielectric layer 101 and the refractive index of the second dielectric layer 102 are related to the materials of the first dielectric layer 101 and the second dielectric layer 102. In some embodiments of the present disclosure, the material of the first dielectric layer 101 can be selected as Ta2O5 (tantalum pentoxide), the refractive index of Ta2O5 is 2.05 to 2.25, and the refractive index is preferably 2.1. Of course, the material of the first dielectric layer 101 can also be selected as TiO2 (antimony oxide), Ti3O5 (antimony pentoxide), Nb2O5 (niobium pentoxide) or H4 (lanthanum titanate), wherein the refractive index of TiO2 (antimony oxide) is 2.35±0.5, the refractive index of Ti3O5 (antimony pentoxide) is 2.35±0.5, the refractive index of Nb2O5 (niobium pentoxide) is 2.35±0.5, and the refractive index of H4 (lanthanum titanate) is 2.05±0.5. The material of the second dielectric layer 102 can be SiO2 (silicon dioxide), and the refractive index of silicon dioxide is 1.45 to 1.49, preferably 1.47. As an alternative material for the second dielectric layer 102, (silicon aluminum mixture) can also be selected, and the refractive index of Al2O3 is 1.64±0.3, and the refractive index of SiAl mixture is 1.5±0.2.

[0059] For example, the materials of different first dielectric layers 101 can be the same or different, and the materials of different second dielectric layers 102 can also be the same or different. By designing the number and thickness of dielectric layers with different refractive indices, a transflective film with specific polarization characteristics can be obtained.

[0060] Further, in some embodiments of the present disclosure, both sides of the metal layer 201 are the first dielectric layer 101 or the second dielectric layer 102, that is, the dielectric layers on both sides of the metal layer 201 are the same, and can be both the first dielectric layer 101 or both the second dielectric layer 102. The metal layer 201 can be one layer or multiple layers, and at least one side of each metal layer 201 is provided with the first dielectric layer 101 or the second dielectric layer 102, and the metal layer 201 includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer and an aluminum reflective layer. The material of the metal layer 201 is preferably silver, and the thickness of each metal layer 201 is 1nm-50nm, preferably 15nm-30nm. Taking the case where the first dielectric layer 101 is provided on both sides of the metal layer 201 as an example, the thickness of the first dielectric layer 101 on both sides is between 10nm-100nm.

[0061] For example, in some embodiments of the present disclosure, the number of layers of the first dielectric layer 101 and the second dielectric layer 102 in the first film layer portion 1 is equal, and the total number of layers of the first film layer portion 1 is less than or equal to 20. For example, the number of layers of the first dielectric layer 101 in the first film layer portion 1 is less than or equal to 10, and the number of layers of the second dielectric layer 102 in the first film layer portion 1 is less than or equal to 10. In this way, the transflective film 1 has a fewer film layer structure, and can still adjust the reflectivity of P-polarized light and S-polarized light to obtain a higher reflectivity of P-polarized light and a lower reflectivity of S-polarized light, which not only simplifies the film layer structure and reduces the film layer thickness, but also helps to reduce costs.

[0062] Preferably, the number of the first dielectric layer 101 is less than or equal to 5, and the number of the second dielectric layer 102 is less than or equal to 5.

[0063] Further, in some embodiments of the present disclosure, the thickness of the first dielectric layer 101 in the first film layer portion 1 is between 10 nm and 100 nm, and the thickness of the second dielectric layer 102 in the first film layer portion 1 is between 15 nm and 150 nm. The thickness of the first dielectric layer in different layers may be different, and the thickness of the second dielectric layer in different layers may also be different.

[0064] For example, the minimum thickness of the first dielectric layer 101 in the first film layer portion 1 is smaller than the minimum thickness of the second dielectric layer 102 in the first film layer portion 1 , and the maximum thickness of the first dielectric layer 101 in the first film layer portion 1 is smaller than the maximum thickness of the second dielectric layer 102 in the first film layer portion 1 .

[0065] Furthermore, in some embodiments of the present disclosure, the thickness of the first dielectric layer 101 and the second dielectric layer 102 in the second film layer portion 2 gradually decreases in the direction away from the first film layer portion 1. Taking the example of providing the first dielectric layer 101 on both sides of the metal layer 201, the thickness of the first dielectric layer 101 close to the first film layer portion 1 is greater than the thickness of the first dielectric layer 101 away from the first film layer portion 1. Preferably, the difference in thickness between the two first dielectric layers 101 is less than 50 nm.

[0066] Further, in some embodiments of the present disclosure, the second film layer portion 2 further includes a support layer 202, which contacts the metal layer 201 and is located on at least one side of the metal layer 201. For example, the material of the support layer 202 can be Al2O3, and the support layer 202 is provided to improve the adhesion of the metal layer 201 and to improve the internal structural force and structural strength of the transflective film. The thickness of the support layer 202 is between 10nm and 100nm, preferably 20nm to 50nm.

[0067] Furthermore, in some embodiments of the present disclosure, the total number of layers of the first transflective film is less than or equal to 30, and the total thickness of the first transflective film is between 100 nm and 800 nm, preferably between 300 nm and 500 nm.

[0068] The total number of layers of the first transflective film is the sum of the number of layers of all the film layers in the transflective film, that is, the total number of layers of the transflective film is equal to the sum of the number of first dielectric layers, the number of second dielectric layers, the number of metal layers and the number of supporting layers.

[0069] The following is a description of the first reflective film provided in an embodiment of the present disclosure with reference to the accompanying drawings. The first reflective film is a P-light reflective film, wherein layers 1 to 8 on the upper side are the first film layer portion 1, the first dielectric layers 101 and the second dielectric layers 102 are alternately arranged, layers 9 to 12 are the second film layer portion 2, the first dielectric layers 101 are respectively arranged on both sides of the metal layer 201, and a support layer 202 is also provided on one side of the metal layer 201.

[0070] For example, the first transflective film is an optical coating. It should be understood here that optical coating refers to combining one or more layers of dielectric films or metal films or two films on an optical element or an independent substrate to change the transmission characteristics of light waves, including light transmission, reflection, absorption, scattering, polarization and phase change. Therefore, through appropriate design, the transmittance and reflectivity of components in different bands can be adjusted, and light with different polarization planes can be different.

[0071] It should be understood that if the optical film is stacked by at least two film layers with different refractive indices, the "different refractive indices" here means that the film layers have different refractive indices in at least one direction in the three directions of xyz; by pre-selecting the required film layers with different refractive indices and stacking the film layers in a pre-set order, an optical film with selective reflection and selective transmission characteristics can be formed, and the optical film can selectively transmit light with the first characteristic and selectively reflect or absorb light with the second characteristic.

[0072] Furthermore, in some embodiments of the present disclosure, a head-up display system is also provided, including a head-up display and a first external reflector. The head-up display includes an image source, and the image source is used to emit image light. The first external reflector is the reflector in the above embodiment, which has corresponding beneficial effects. In order to avoid repeated description, it is not repeated here. The first external reflector reflects the image light to the eye box area to form a virtual image. 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.

[0073] In the related art, the image light emitted by the image source is usually S-polarized light. Since the reflectivity of the windshield to S-polarized light is also relatively high, undesirable ghosting will be formed after reflection through the windshield. At the same time, if the user wears polarized sunglasses that only transmit P-polarized light, the user can hardly or not perceive the image of the head-up display device at all.

[0074] The present disclosure embodiment, such as Figure 2 As shown, by providing the first reflective film 10 with a higher reflectivity for P-polarized light on the first external reflective member 20, and coordinating the control of the image source 30 to emit image light with P-polarized light and a suitable incident angle, not only can the user clearly see the virtual image 40 formed by the P-polarized light reflected by the first reflective film 10, but also the reflectivity of the first external reflective member 20 for reflected S-polarized light is low, and the windshield of the first external reflective member 20 hardly reflects the P-polarized image light, so the image light will not form a double image or the effect of the double image will be small after being reflected by the first external reflective member 20; at the same time, even if the driver wears polarized sunglasses that project P-polarized light, the image formed by the head-up display device can be clearly seen.

[0075] For example, the image source includes a backlight unit and an image generating unit, the backlight unit includes a plurality of backlights, the image generating unit includes a display panel, the display panel includes a plurality of display areas, the plurality of display areas correspond one to one with the plurality of backlights, the control module determines the brightness information corresponding to each display area according to the image to be displayed on the display panel; determines the target brightness corresponding to each backlight according to the brightness information corresponding to each display area; and controls each backlight based on the target brightness corresponding to each backlight. When displaying, the head-up display provided by the present disclosure determines the target brightness corresponding to each backlight in the image source according to the image to be displayed, and controls the backlight according to the target brightness. By controlling each backlight individually, the light waste caused by lighting all the backlights is avoided, the power consumption is reduced, and the light utilization rate and image contrast are improved.

[0076] For example, according to the distribution of the display content in each display area in the image to be displayed, the display area of ​​the display panel can be divided into a dark area and a brightness area. The dark area is a display area with low display brightness (or no display content), and the bright area is a display area with high display brightness (or display content). The brightness information corresponding to the bright area and the dark area is different, and the target brightness of the backlight determined according to the brightness information is also different, so as to achieve the backlight control of the dark area and the bright area of ​​the image respectively. Since the backlight brightness of the dark area and the brightness is different, the effect of improving the image contrast can be achieved, and then the contrast of the virtual image formed by the head-up display is also improved. At the same time, reducing the brightness of the backlight corresponding to the dark area or turning off the backlight in the dark area can also reduce the backlight power consumption, thereby reducing the overall power consumption of the display panel.

[0077] For example, according to the image to be displayed on the display panel, a pixel group corresponding to each display area is determined, and the pixel group includes multiple pixels. Specifically, the image to be displayed is composed of multiple pixels, each pixel displays a color, and the pixel group in the image to be displayed corresponding to each display area can be determined according to the distribution of the display content in the image to be displayed in each display area, that is, the multiple pixels in the image to be displayed corresponding to each display area. Among them, the display panel includes multiple pixel units, each pixel unit corresponds to a group of three primary color filters, and one pixel in the image to be displayed corresponds to one pixel unit on the display panel.

[0078] For example, Figure 2 As shown, the head-up display utilizes the first external reflector 20 to reflect the outgoing light of the image source 30, so that the observer can simultaneously observe the virtual image formed outside the first external reflector 2 and the object outside the first external reflector 20 in the eye box area. When displaying, the head-up display system provided by the embodiment of the present disclosure can control each backlight individually for the image to be displayed, thereby avoiding turning on all the backlights, but only turning on some of the backlights, and the luminous brightness of each backlight can also be independently controlled. By controlling the backlights of different areas corresponding to the image to be displayed, it is possible to turn off some of the backlights and light up other backlights, thereby improving the image contrast, thereby improving the contrast of the virtual image formed by the head-up display device, and at the same time, it is also possible to reduce the power consumption of the head-up display device by turning off some of the backlights or reducing the brightness of some of the backlights.

[0079] The head-up display system disclosed herein, when used in conjunction with windshields at the front side windows, rear side windows, etc., can be used as an entertainment system for front and rear vehicle occupants.

[0080] For example, the head-up display is set to face the corresponding windshield, and the image light emitted by the head-up display is projected onto the windshield. The image light is reflected by the reflector to form a virtual image that can be perceived by the vehicle occupants, and the virtual image can be visually formed on the outside of the windshield. In this way, the versatility and entertainment of the head-up display system can be increased, and the user experience can be improved.

[0081] Furthermore, in some embodiments of the present disclosure, the head-up display system further includes a second external reflector, the second external reflector includes a front windshield of the vehicle, and the second external reflector includes a second substrate and a second transflective film. The second transflective film may have the same structure as the first transflective film. In other words, the image light may be reflected on the front windshield, side windows and skylight windows of the vehicle to form a virtual image.

[0082] On the basis of the above implementation, the embodiment of the present disclosure further provides a vehicle, the vehicle includes the above reflector, or the vehicle includes the above head-up display system. There are corresponding beneficial effects, which will not be described here to avoid repeated description.

[0083] The transportation means include but are not limited to vehicles, and also include all transportation means known to those skilled in the art, such as ships, airplanes or spacecraft, etc., which are not limited here.

[0084] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0085] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reflector, characterized in that: It comprises a first substrate and a first transflective film, wherein the first substrate is at least one of a side window and a skylight window of the vehicle, and the reflectivity of the first transflective film to the first polarized light is greater than the reflectivity to the second polarized light.

2. The reflector according to claim 1, characterized in that: The first transflective film is arranged on the surface of the first substrate and / or inside the first substrate, and the first transflective film comprises a first film layer portion (1) and a second film layer portion (2) which are stacked, the first film layer portion (1) being located at least on one side of the second film layer portion (2), the first film layer portion (1) comprising a first dielectric layer (101) or a second dielectric layer (102) or first dielectric layers (101) and second dielectric layers (102) which are alternately arranged, the second film layer portion (2) comprising a metal layer (201) and the first dielectric layer (101) and / or the second dielectric layer (102) which are arranged on both sides of the metal layer (201), and the refractive index of the first dielectric layer (101) is not equal to the refractive index of the second dielectric layer (102).

3. The reflector according to claim 1, characterized in that: The first polarized light is P polarized light, the second polarized light is S polarized light, and when the first transflective film is within a first incident angle range, within at least half of a wavelength range of 390-780nm, the reflectivity of the first transflective film to the first polarized light is greater than or equal to 20%, and the reflectivity to the second polarized light is less than 20%.

4. The reflector according to claim 3, characterized in that: When the first transflective film is within the second incident angle range, the reflectivity fluctuation range of the first polarized light within the wavelength range of 390-780nm is less than 30%.

5. The reflector according to claim 3, characterized in that: When the first reflective film is within the third incident angle range, the average reflectivity of the first polarized light in the wavelength range of 420-490nm is a first reflectivity, the average reflectivity of the first polarized light in the wavelength range of 500-560nm is a second reflectivity, and the average reflectivity of the first polarized light in the wavelength range of 580-630nm is a third reflectivity, wherein the difference among the first reflectivity, the second reflectivity and the third reflectivity is less than or equal to 10%.

6. The reflector according to claim 2, characterized in that: The refractive index of the first dielectric layer (101) is greater than or equal to 2.0, and the refractive index of the second dielectric layer (102) is less than or equal to 1.7; and / or, The number of the first dielectric layers (101) in the first film layer portion (1) is less than or equal to 10, and the number of the second dielectric layers (102) is less than or equal to 10.

7. The reflector according to claim 2 or 6, characterized in that: The thickness of the first dielectric layer (101) in the first film layer portion (1) is between 10 nm and 100 nm, and the thickness of the second dielectric layer (102) in the first film layer portion (1) is between 15 nm and 150 nm.

8. The reflector according to claim 7, characterized in that: The minimum thickness of the first dielectric layer (101) in the first film layer portion (1) is smaller than the minimum thickness of the second dielectric layer (102) in the first film layer portion (1); and / or, The maximum thickness of the first dielectric layer (101) in the first film layer portion (1) is smaller than the maximum thickness of the second dielectric layer (102) in the first film layer portion (1).

9. The reflector according to claim 2 or 6, characterized in that: The thickness of the first dielectric layer (101) or the second dielectric layer (102) in the second film layer portion (2) gradually decreases in a direction away from the first film layer portion (1).

10. The reflector according to claim 2, characterized in that: The metal layer includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer and an aluminum reflective layer; and / or the single layer thickness of the metal layer is 1 nm to 50 nm.

11. The reflector according to claim 2 or 10, characterized in that: The second film layer portion (2) further comprises a supporting layer (202), wherein the supporting layer (202) is in contact with the metal layer (201) and is located on at least one side of the metal layer (201).

12. The reflector according to claim 2, characterized in that: The total number of layers of the first transflective film is less than or equal to 30, and / or the total thickness of the first transflective film is between 100 nm and 800 nm.

13. A head-up display system, characterized in that: include: A head-up display, the head-up display comprising an image source, the image source being used to emit image light; A first external reflector, wherein the first external reflector is the reflector according to any one of claims 1 to 12, and the first external reflector reflects the image light to an eye box area to form a virtual image.

14. The head-up display system according to claim 13, characterized in that: A second external reflector is also included, the second external reflector includes a front windshield of the vehicle, and the second external reflector includes a second substrate and a second transflective film.

15. A means of transport, characterized in that: It comprises the reflector as described in any one of claims 1 to 12; or, it comprises the head-up display system as described in any one of claims 13 to 14.

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