An augmented reality automotive rearview mirror lens and method of making the same

Abstract

The application relates to the technical field of automobile parts, in particular to an augmented reality automobile interior rearview mirror lens and a preparation method thereof. The automobile interior rearview mirror lens comprises a glass substrate, a half-reflective half-transmissive film and a reflection-reducing film formed on the two side surfaces of the glass substrate respectively; the reflection-reducing film comprises at least one high-refractive layer formed on the surface of the glass substrate and at least one low-refractive layer formed on the surface of the high-refractive layer; the refractive index of the high-refractive layer is 1.90-2.72; and the refractive index of the low-refractive layer is 1.46-1.60. The automobile interior rearview mirror lens provided by the application can effectively enhance reality and display images without ghosting and in neutral color.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts, in particular to an augmented reality automobile interior rearview mirror lens and a preparation method thereof. BACKGROUND

[0002] With the continuous updating and change of automobile product market concepts, the market puts forward higher requirements for the safety, easy operation, durability and aesthetics of car rearview mirrors. In addition, the existing intelligent rearview mirrors in the market have obvious shortcomings, such as too low optical performance (brightness and contrast), and obvious color difference between the intelligent display area and the non-view area when the intelligent display area is not lit.

[0003] To solve the above problems, the industry has developed a semi-reflective and semi-transmissive lens. Chinese patent CN1148533358A discloses a cold-tone semi-reflective and semi-transmissive coated glass and a preparation method thereof, which uses titanium nitride material in the first high refractive index layer and the top protective layer to form a "sandwich" protective structure, thereby playing a protective role against scratches and wear.

[0004] Chinese patent CN108218250A discloses a semi-reflective and semi-transmissive glass, which has good acid and alkali resistance, solvent resistance and water resistance by reasonable selection of high and low refractive index materials.

[0005] Chinese patent CN109231847A discloses a semi-reflective and semi-transmissive glass and a preparation method thereof, which has a visible light reflectance adjustable in the range of 40% to 70% and good processing performance and acid and alkali corrosion resistance by limiting the film layer material and thickness.

[0006] When these semi-reflective and semi-transmissive lenses are applied to automobile interior rearview mirrors, the display area can be used as a rearview mirror to reflect the rear view when not lit, and the display content can be observed when the display area is lit. However, such semi-reflective and semi-transmissive lenses have the problem of image blur caused by mirror image ghosting, and some products have the problem of color distortion (blue color) of the reflected image and red color (red image in the display area) of the transmitted color to improve the reflectivity of the semi-reflective and semi-transmissive lens. SUMMARY

[0007] To overcome the defects of the prior art, the present application solves the technical problem of providing an automobile interior rearview mirror lens with no image ghosting and neutral color and a preparation method thereof.

[0008] To solve the above technical problems, the present application provides an augmented reality automobile interior rearview mirror lens, which comprises a glass substrate, and a semi-reflective and semi-transmissive film and an anti-reflection film formed on both sides of the glass substrate.

[0009] The anti-reflection film comprises at least one high-refractive layer formed on the surface of the glass substrate and at least one low-refractive layer formed on the surface of the high-refractive layer.

[0010] The high-refractive layer has a refractive index of 1.90-2.72.

[0011] The low-refractive layer has a refractive index of 1.46-1.60.

[0012] Further provided is a preparation method of the augmented reality automotive interior rearview mirror lens, comprising the steps of plating a semi-reflective and semi-transmissive film and an anti-reflection film on the two sides of a glass substrate.

[0013] The anti-reflection film comprises at least one high-refractive layer formed on the surface of the glass substrate and at least one low-refractive layer formed on the surface of the high-refractive layer.

[0014] The high-refractive layer has a refractive index of 1.90-2.72.

[0015] The low-refractive layer has a refractive index of 1.46-1.60.

[0016] The present application has the advantages that the anti-reflection film is deposited on the outer surface of the rearview mirror lens (glass substrate), and the semi-reflective and semi-transmissive film layer is reasonably designed on the inner surface of the rearview mirror lens, so that the rear field of view reflected by the rearview mirror and the displayed reversing image are both free of ghosting and have natural colors, the reality of the rearview mirror is enhanced, and the safety of vehicle driving is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure shows the optical path diagram of the existing automotive interior rearview mirror lens with a semi-reflective and semi-transmissive film in the specific embodiment of the present application.

[0018] Figure 2 The figure shows the optical path diagram of the existing automotive interior rearview mirror lens with a semi-reflective and semi-transmissive film in the specific embodiment of the present application.

[0019] Figure 3 The figure shows the morphology photo of the TiO2 film layer deposited by the HiPIMS power supply and the MF power supply and the related component composition analysis table in the specific embodiment of the present application.

[0020] Figure 4 The figure shows a structural schematic diagram of the augmented reality automotive interior rearview mirror lens in the specific embodiment of the present application.

[0021] Figure 5 The figure shows another structural schematic diagram of the augmented reality automotive interior rearview mirror lens in the specific embodiment of the present application.

[0022] Explanation of reference numerals

[0023] In Figure 1 and Figure 2 : 11, light source; 22, 31, 42, refracted light; 21, 32, reflected light; 4, semi-reflective semi-transmissive film; 5, glass substrate; 6, anti-reflection film;

[0024] In Figure 4 and Figure 5 : 1, 11, glass substrate; 2, 22, first high-refractive-index layer; 21, first medium-refractive-index layer; 3, 31, first low-refractive-index layer; 4, 42, second high-refractive-index layer; 41, second medium-refractive-index layer; 5, 51, second low-refractive-index layer; 6, 61, third high-refractive-index layer; 7, 71, third low-refractive-index layer; 8, 81, fourth high-refractive-index layer; 9, 91, fourth low-refractive-index layer. DETAILED DESCRIPTION

[0025] To explain the technical content, purposes and effects of the present application in detail, the following describes the embodiments in conjunction with the drawings.

[0026] The prior art solves the defects of the existing intelligent rearview mirror in the market by coating a semi-reflective semi-transmissive film on the back of the glass substrate (the side facing away from the incident light), as shown in Figure 1 The semi-reflective semi-transmissive film 4 is located inside the rearview mirror, i.e., between the display screen and the glass substrate 5. When a person's eye observes the rear field of view through the rearview mirror, the angle between the eye and the rearview mirror is a certain angle (lateral / longitudinal angle). The rear light source 11 (100%) is incident from the air to the glass interface, generating reflected light 21 and refracted light 22. Only about 4% of the reflected light 21 enters the eye. Since the overall thickness of the film layer (semi-reflective semi-transmissive film 4) is too thin, the reflection and refraction of the refracted light 22 in the semi-reflective semi-transmissive film 4 can be temporarily ignored. At this time, the refracted light 22 also generates reflected light 32 and refracted light 31 from the glass / film layer, air interface. Since the film layer is designed to have semi-reflective semi-transmissive properties, the refracted light 31 is about 50%, and the reflected light 32 is about 46%. The reflected light 32 is reflected out of the glass substrate 5, generating reflected light (shown by the dashed line in the figure, which can be ignored due to the small amount) and refracted light 42 (about 42%) again at the glass / air interface. The refracted light 42 can enter the eye. Therefore, since the secondary image (4%) formed by the reflected light 21 and the primary image (about 46%) formed by the refracted light 42 enter the eye at the same time, the brightness ratio of the two is large, thus causing image blurring in the eye. At the same time, the brightness ratio of the two increases with the increase of the observation angle. Similarly, the image displayed by the display screen on the back of the rearview mirror also becomes blurred in the eye.

[0027] The present application coats an anti-reflection film on the front of the glass substrate on the basis of the prior art, as shown inFigure 2 As shown in the figure, the antireflection film 6 can significantly reduce the brightness of the secondary image and enhance the brightness of the primary image, thus the brightness ratio of the secondary image (0.5%) formed by the reflected light 21 and the primary image (about 49.5%) formed by the refracted light 42 is reduced, thereby achieving the effect of augmented reality and avoiding ghosting.

[0028] Therefore, the present application provides an augmented reality automotive interior mirror lens which can reduce the brightness of the secondary image and enhance the brightness of the primary image by using an antireflection film, so as to reduce the brightness ratio of the two, thereby avoiding ghosting and enhancing reality. In one embodiment, the automotive interior mirror lens comprises a glass substrate, and a semi-reflective and semi-transmissive film and an antireflection film formed on the two side surfaces of the glass substrate, respectively; wherein the antireflection film comprises at least one high refractive index layer formed on the surface of the glass substrate and at least one low refractive index layer formed on the surface of the high refractive index layer; the refractive index of the high refractive index layer is 1.90-2.72; the refractive index of the low refractive index layer is 1.46-1.60. The glass substrate can be any existing glass for automotive interior mirror, such as float ultra-white flat glass, etc., and the thickness thereof can be selected according to actual needs, for example, the thickness of the glass substrate is 3.5 mm.

[0029] In an alternative embodiment, referring to Figure 4 As shown in the figure, the antireflection film comprises a third high refractive index layer 6, a third low refractive index layer 7, a fourth high refractive index layer 8 and a fourth low refractive index layer 9 formed in sequence on the surface of the glass substrate 1.

[0030] In the present application, the film layer materials and their refractive indices mainly follow the basic principle of antireflection film layer design, which is high / low refractive index stacking, and the selection of film layer materials is mainly based on the consideration of material refractive index. For the thickness of the film layer, the main consideration is the antireflection effect and the color of the front and side surfaces which should be kept as neutral as possible, for example, the main standard for keeping the color of the front surface (8°) neutral is that the a and b values are close to 0, and the standard for keeping the color of the side surface (8°-60°) neutral is also that the a and b values are close to 0. For example, under the premise of keeping the color of the side surface of the antireflection film system neutral, the color of the front and side surfaces of the semi-reflective and semi-transmissive film system is designed to keep the overall color of the two surfaces neutral after plating. For another example, under the premise of less red color of the side surface of the antireflection film system, the side surface color of the semi-reflective and semi-transmissive film system is adjusted to compensate for the side surface color of the antireflection film system, so that the overall side surface color is close to neutral after plating.

[0031] In one embodiment, the material of the third high refractive index layer is selected from SiN x , SiAlN x , SiBN x , SiTiN x , SiZrNx NbO x ZrO x At least one of TiO2; wherein 1 < x < 3, and the thickness of the third high refractive index layer is 5 to 30 nm.

[0032] In one embodiment, the material of the third low-refractive-index layer is selected from SiO2. x SiBO x SiTiO x SiAlO x SiZrO x At least one of the following; wherein 1 < x < 3, and the thickness of the third low-refractive-index layer is 30–55 nm.

[0033] In one embodiment, the material of the fourth high-refractive-index layer is selected from SiN. x SiAlN x SiBN x SiTiN x SiZrN x NbO x ZrO x At least one of TiO2; wherein 1 < x < 3, and the thickness of the fourth high refractive index layer is 15 to 45 nm.

[0034] In one embodiment, the material of the fourth low-refractive-index layer is selected from SiO2. x SiBO x SiTiO x SiAlO x SiZrO x At least one of the following; wherein 1 < x < 3, and the thickness of the fourth low-refractive-index layer is 85–120 nm.

[0035] In real-world use, since the brightness of a display is adjustable, some existing semi-reflective rearview mirrors can increase the reflectivity to make the field of view brighter. This results in the mirror surface appearing greenish or bluish, while the transmitted color appears reddish, leading to a reddish tint in the real-time image and creating an unrealistic image. For example, as shown in Table 5, Comparative Example 2 uses TiO2 (n = 2.50, k (extinction coefficient) = 0.0034) as the high refractive index layer material. Although it can increase the brightness of reflected light to 58.5%, the mirror surface has an a value of -8.2, resulting in a greenish tint. At angles of 30° to 60°, the b value is significantly negative, indicating a bluish tint. The a value for frontal transmission is 9.6, resulting in a noticeably reddish tint to the displayed image. Therefore, a reasonable film system design is needed for the semi-reflective and semi-transparent film to ensure that the anti-reflective film system and the semi-reflective and semi-transparent film system do not interfere with each other. This allows the rearview mirror lens to perform its semi-reflective and semi-transparent function while also using the anti-reflective film to enhance image reality. Furthermore, a reasonable film system design can eliminate the change in side color when the two color systems are combined. For example, as shown in Table 7 below, when the anti-reflective film is double-coated in Comparative Example 4, its a and b values ​​are both positive at angles of 15° to 60°. Therefore, when the anti-reflective film is combined with the semi-reflective and semi-transparent film, as shown in Example 9, and combined with a specific film layer design, such as adding a medium refractive index layer, the side color is normal and the image is not color-distorted when the two are combined.

[0036] In one embodiment, the semi-reflective and semi-transparent film includes at least one high-refractive-index layer formed on the surface of the glass substrate and at least one low-refractive-index layer formed on the surface of the high-refractive-index layer; in the semi-reflective and semi-transparent film, the refractive index of the high-refractive-index layer is 2.45 to 2.72; and the refractive index of the low-refractive-index layer is 1.46 to 1.60.

[0037] In the first alternative implementation, see Figure 4 As shown, the semi-reflective and semi-transparent film includes a first high refractive index layer 2, a first low refractive index layer 3, a second high refractive index layer 4, and a second low refractive index layer 5 sequentially stacked on the surface of the glass substrate 1.

[0038] In a second optional embodiment, the semi-reflective and semi-transparent film comprises a first intermediate refractive index layer, a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer stacked sequentially; wherein the refractive index of the first intermediate refractive index layer is 1.60 to 2.45.

[0039] In the third alternative implementation, see Figure 5As shown, the semi-reflective and semi-transmissive film comprises a first middle refractive index layer 21, a first high refractive index layer 22, a first low refractive index layer 31, a second middle refractive index layer 41, a second high refractive index layer 42 and a second low refractive index layer 51 which are stacked in sequence; wherein the refractive index of the first middle refractive index layer 21 and the second middle refractive index layer 42 is 1.60-2.45.

[0040] In a preferred embodiment, the refractive index of the high refractive index layer in the semi-reflective and semi-transmissive film is 2.45-2.72, and the refractive index of the low refractive index layer is 1.46-1.60.

[0041] In an embodiment, the first high refractive index layer and the second high refractive index layer are TiO2 film layers deposited by MF power or HiPIMS power, and the thickness of the first high refractive index layer and the second high refractive index layer is 35-65 nm.

[0042] It should be noted that, for the convenience of writing, TiO2 film layers formed by MF or HiPIMS power are referred to as MF or HiPIMS power formed film layers in this document, but the material of the TiO2 film layer formed by HiPIMS power should be understood as TiO x , wherein 1.8≤X≤2.

[0043] In a preferred embodiment, the first high refractive index layer and the second high refractive index layer are TiO2 film layers deposited by a HiPIMS power supply, thereby obtaining a film layer with a high refractive index n (2.50≤n≤2.72). Specifically, TiO2 material has three crystal structures, including brookite TiO2, rutile TiO2 and anatase TiO2. Among them, the synthesis of brookite is more difficult. Rutile has higher stability, and has higher refractive index, relative density and dielectric constant compared with anatase. Anatase is a metastable phase, and with the increase of heating temperature, the microstructure of TiO2 thin film undergoes a phase transition from amorphous state to anatase crystal phase, to anatase and rutile mixed crystal phase, and to rutile crystal phase. According to the relevant literature, the heating temperature required for TiO2 thin film to completely convert to rutile state is above 1000℃. However, the TiO2 film layer deposited by a conventional MF power supply is difficult to completely convert to rutile structure after heating annealing (600-790℃) due to insufficient heating temperature, thereby resulting in a refractive index n of the annealed film layer generally limited to n≤2.50, and it is difficult to prepare a film layer with a refractive index greater than 2.50. At the same time, the TiO2 film layer deposited by a conventional MF power supply has fewer ions and lower ionization rate. Although vacuum cathode arc deposition can produce a very high particle ionization rate, it will produce too many impurities in the coating layer due to the large metal / metal compound particles, and the cathode needs to be cooled when overheated, so it is difficult to be applied to the automotive glass coating industry. The HiPIMS power supply is suitable for use in the automotive glass coating industry because it has a high pulse peak power and a low pulse duty cycle, and has no additional requirements for cathode cooling while ensuring high ionization rate. The related parameters of the HiPIMS (high power pulsed magnetron sputtering) power supply and the MF power supply are shown in Table 1.

[0044] Table 1

[0045] MF HiPIMS Working power (non-averaged power) < 120 kW 100 kW - 2 MW Peak power 10 W / cm 2 level 1-3 KW / cm 2 stage Current density 10 mA / cm 2 stage 1-5 A / cm 2 stage Duty cycle 100％ 1％～15％ Working voltage 0～800V 0～2000V Working current 0～200A 0～1000A Ionization rate 30％～40％ Maximum > 80% Film layer adhesion Weak Strong

[0046] At the same time, it has been proved in the pre-experiment that the TiO2 film layer deposited by the HiPIMS power supply has a rutile structure, and the results are shown in Table 2 and Figure 3 Table 3.

[0047] Table 2

[0048]

[0049] Therefore, the power supply parameters of the HiPIMS can be adjusted to obtain a TiO2 film layer with a refractive index n of 2.50-2.72 after heating annealing. And thanks to the high ionization rate of the TiO x film layer, the antireflection film system can convert the TiO x film layer to the rutile structure during the heating annealing process.

[0050] In one embodiment, the first low refractive index layer has a refractive index of 1.50-1.70, and the second low refractive index layer has a refractive index of 1.50-1.70. x In one embodiment, the process parameters of the film layer are shown in Table 3.

[0051] Table 3

[0052] Serial number Item Parameter 1 Power supply HiPIMS power supply 2 Target material TiO x Target material, wherein 1.8 < x < 1.9 3 Process gas Ar, O2; wherein O2 is introduced at 0-30 seem 4 Pulse peak power 100 kW - 2000 kW 5 Pulse current 300 A - 1000 A 6 Pulse voltage 300 V - 2000 V 7 Duty cycle 1％～15％ 8 Pulse width 0 - 150 μs

[0053] In one embodiment, the material of the first low refractive index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, SiZrOx, and SiHfOx; wherein 1 x x x x x ; wherein 1

[0054] In one embodiment, the material of the second low refractive index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, SiZrOx, and SiHfOx; wherein 1 x x x x x ; wherein 1

[0055] Based on the second alternative embodiment described above, the material of the first intermediate refractive index layer is selected from at least one of SiNOx, SiBNxOy, SiTiNOx, SiAlNOx, SiZrNOx, ZnO, ZnAlO, ZnSnO, SiN, Nb2O5, ZrO, SiZrN, SiAlN, SiBN, SiTiN; wherein 1 x y x y x y x y x y x x x ; wherein 1 x x x x x x ; wherein 1

[0056] Based on the third alternative embodiment described above, the material of the first intermediate refractive index layer and the second intermediate refractive index layer is selected from at least one of SiNOx, SiBNxOy, SiTiNOx, SiAlNOx, SiZrNOx, ZnO, ZnAlO, ZnSnO, SiN, Nb2O5, ZrO, SiZrN, SiAlN, SiBN, SiTiN; wherein 1​​​​​​​​​​​​​​​​​​​​​​​​​x O y , SiBN x O y , SiTiN x O y , SiAlN x O y , SiZrN x O y , ZnO x , ZnAlO x , ZnSnO x , SiN x , Nb2O5, ZrO x , SiZrN x , SiAlN x , SiBN x , SiTiN x ; wherein 1 < x < 3, 1 < y < 3, the thickness of the first and second intermediate refractive index layers is 0-100 nm.

[0057] In one embodiment, the automotive interior rearview mirror has a visible light reflection color with Lab values of a: -3 < a < 0; b: -1 < b < 1; and a visible light reflectance of 48 < R < 60.

[0058] In one embodiment, the automotive interior rearview mirror has a visible light transmission color with Lab values of a: a < 3.5; and a visible light transmittance of 40 < T < 52.

[0059] A method for preparing an augmented reality automotive interior rearview mirror, comprising the steps of coating a semi-reflective and semi-transmissive film and an anti-reflective film on both sides of a glass substrate; wherein the anti-reflective film comprises at least one high refractive index layer formed on the surface of the glass substrate and at least one low refractive index layer formed on the surface of the high refractive index layer; the refractive index of the high refractive index layer is 1.90-2.72; and the refractive index of the low refractive index layer is 1.46-1.60.

[0060] In one embodiment, the semi-reflective and semi-transmissive film comprises a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer formed by magnetron sputtering in sequence; wherein the first high refractive index layer is formed by magnetron sputtering on the surface of the glass substrate, the refractive index of the first and second high refractive index layers is 2.45-2.72; and the refractive index of the first and second low refractive index layers is 1.46-1.60.

[0061] In the first alternative embodiment, the semi-reflective and semi-transmissive film comprises a first high refractive index layer, a first low refractive index layer, a second high refractive index layer and a second low refractive index layer formed by magnetron sputtering in sequence.

[0062] In the second alternative embodiment, the semi-reflective and semi-transmissive film comprises a first medium refractive index layer, a first high refractive index layer, a first low refractive index layer, a second high refractive index layer and a second low refractive index layer formed by magnetron sputtering in sequence; wherein the first medium refractive index layer is formed by magnetron sputtering on the surface of the glass substrate, and the refractive index of the first medium refractive index layer is 1.60-2.45.

[0063] In the third alternative embodiment, the semi-reflective and semi-transmissive film comprises a first medium refractive index layer, a first high refractive index layer, a first low refractive index layer, a second medium refractive index layer, a second high refractive index layer and a second low refractive index layer formed by magnetron sputtering in sequence; wherein the first medium refractive index layer is formed by magnetron sputtering on the surface of the glass substrate, and the refractive index of the first medium refractive index layer and the second medium refractive index layer is 1.60-2.45.

[0064] In one embodiment, the first high refractive index layer and the second high refractive index layer are TiO2 film layers deposited by MF power supply or HiPIMS power supply, and the thickness of the first high refractive index layer and the second high refractive index layer is 35-65 nm.

[0065] Preparation Example 1 (Example 1 is taken as an example)

[0066] A preparation method of an augmented reality automotive interior rearview mirror lens, comprising the following steps:

[0067] S1, after the thickness of 3.5 mm of the float ultra-white flat glass is washed and dried, it is put into the magnetron sputtering film coating line to coat the antireflection film layer;

[0068] S2, magnetron sputtering of the third high refractive index layer 61: TiO2, parameters are as follows:

[0069] The target material is configured as ceramic TiO

[0070] The target material is configured as ceramic TiO x (x=1.8); process gas: Ar:O2=1000:30;

[0071] Sputtering gas pressure 2.8E -3 mbar; film coating thickness is 16.6 nm;

[0072] S3, magnetron sputtering of the third low refractive index layer 71: SiO2, parameters are as follows:

[0073] Target quantity: double rotary cathode 2; target power supply: MF (medium frequency power supply);

[0074] Target configuration: SiAl (Si: Al = 92: 8wt%) ; process gas: Ar: O2= 700: 350;

[0075] Sputtering gas pressure 3.5E -3 mbar; film thickness is 42.4nm;

[0076] S4, magnetron sputtering fourth high refractive index layer 81: TiO2, parameters as follows:

[0077] Target quantity: double rotary cathode 1; target power supply: MF (medium frequency power supply);

[0078] Target configuration: ceramic TiO x (x = 1.8) ; process gas: Ar: O2= 1000: 30;

[0079] Sputtering gas pressure 2.8E -3 mbar; film thickness is 24.1nm;

[0080] S5, magnetron sputtering fourth low refractive index layer 91: SiO2, parameters as follows:

[0081] Target quantity: double rotary cathode 4; target power supply: MF (medium frequency power supply);

[0082] Target configuration: SiAl (Si: Al = 92: 8wt%) ; process gas: Ar: O2= 700: 350;

[0083] Sputtering gas pressure 3.4E -3 mbar; film thickness is 105.1nm;

[0084] S6, after the film is plated, the antireflection film is optically tested and quality inspected, and after the optical test is completed, it is conveyed to a powder spraying machine for powder spraying and sheet collecting;

[0085] S7, after a package is fully collected, it is transported to a sheet placing position for plating and a traveling crane is used for surface turning, and after washing and drying, it enters a magnetron sputtering plating line to plate a semi-reflective and semi-transmissive film layer;

[0086] S8, measure and control sputtering first high refractive index layer 22: TiO2, parameters as follows:

[0087] Target quantity: double rotary cathode 2; target power supply: MF (medium frequency power supply);

[0088] Target configuration: ceramic TiO x (x = 1.8) ; process gas: Ar: O2= 1000: 30;

[0089] Sputtering gas pressure 2.8E -3 mbar; film thickness 46.5nm;

[0090] S9, magnetron sputtering first low refractive index layer 31: SiO2, parameters as follows:

[0091] Target quantity: double rotating cathode 4; target power supply: MF (medium frequency power supply);

[0092] Target configuration: SiAl (Si: Al = 92: 8wt%); process gas: Ar: O2=700:350;

[0093] Sputtering gas pressure 3.4E -3 mbar; film thickness 98.5nm;

[0094] S10, magnetron sputtering second high refractive index layer 42: TiO2, parameters as follows:

[0095] Target quantity: double rotating cathode 2; target power supply: MF (medium frequency power supply);

[0096] Target configuration: ceramic TiO x (x=1.8); process gas: Ar: O2=1000:30;

[0097] Sputtering gas pressure 2.8E -3 mbar; film thickness 48.2nm;

[0098] S11, magnetron sputtering second low refractive index layer 51: SiO2, parameters as follows:

[0099] Target quantity: double rotating cathode 4; target power supply: MF (medium frequency power supply);

[0100] Target configuration: SiAl (Si: Al = 92: 8wt%); process gas: Ar: O2=700:350;

[0101] Sputtering gas pressure 3.4E -3 mbar; film thickness 85.1nm;

[0102] After the film coating is completed, the overall film layer is subjected to optical testing and quality inspection, and after the optical testing is completed, it is conveyed to the powder spraying machine for powder spraying and sheet collection, and after a full package is collected, it is transported to the cutting process;

[0103] S13, cutting the coated original sheet into rectangular small pieces using a glass cutting machine, then cutting the glass into the size of the mirror drawing and edge grinding by a CNC machining center, cleaning the coated original sheet with pure water and a brush to clean the dirt on the surface, and then drying, so as to provide clean conditions for the next glass half steel to avoid the occurrence of problems such as spots and distortion on the mirror surface;

[0104] S14, heating and annealing the cleaned coated original sheet in a tempering furnace, the specific parameters are: (taking the heating air temperature as the standard) heating process: preheating temperature 570℃, preheating time 240s; heating temperature 690℃, heating time 240s; annealing temperature 300℃, annealing time 240s.

[0105] S15, detecting the mirror size stability and coating effect of the lens (excluding lenses with defects such as scratches, pitting, distortion, and edge explosion) to obtain producible automotive rearview mirror lenses after final inspection.

[0106] Preparation Example 2 (taking Example 9 as an example)

[0107] A preparation method of an augmented reality automotive rearview mirror lens, further comprising the steps of magnetron sputtering a first intermediate refractive index layer between S7 and S8, and magnetron sputtering a second intermediate refractive index layer between S9 and S10 based on the preparation example 1;

[0108] The magnetron sputtering of the first intermediate refractive index layer is SiO x N y , and the parameters are as follows:

[0109] The target material number is two rotating cathodes; the target material power supply is MF (medium frequency power supply);

[0110] The target material is configured as SiAl (Si: Al = 92: 8wt%); the process gas is Ar: O2: N2 = 700: 60: 500;

[0111] The sputtering gas pressure is 3.9E -3 mbar; the coating thickness is 71.6nm;

[0112] The magnetron sputtering of the second intermediate refractive index layer is SiO x N y , and the parameters are as follows:

[0113] The target material number is two rotating cathodes; the target material power supply is MF (medium frequency power supply);

[0114] The target material is configured as SiAl (Si: Al = 92: 8wt%); the process gas is Ar: O2: N2 = 700: 60: 500;

[0115] Sputtering pressure 4.2E -3 mbar; film thickness 19.8 nm;

[0116] For other coating parameters, such as the selection of the number of targets, target formulation, process gas, sputtering pressure, etc. can be adapted according to the specific coating composition, coating thickness and target power source selection, which are general techniques in the art and are not described here in detail.

[0117] Examples 1 to 9 and Comparative Examples 1 to 4

[0118] The automotive interior rearview mirror lenses were prepared according to Tables 4 to 9 below and in accordance with the aforementioned Preparation Example 1 or 2, and the prepared automotive interior rearview mirror lenses were subjected to optical detection, and the results are shown in Tables 6 to 9.

[0119] Wherein, the optical data were measured using an Agilent Cary 7000 spectrophotometer, and the color characterization system used the CIELab color system.

[0120] It should be noted that in Table 6, the first high refractive index layer and the second high refractive index layer in Comparative Example 1, and the fourth high refractive index layer, the third high refractive index layer, the first high refractive index layer and the second high refractive index layer in Example 1 are all TiO2layers formed by MF target power (n = 2.50, k = 0.00034); the rest are TiO2layers formed by HiPIMS target power (n = 2.70, k = 0.00226);

[0121] In Table 7, the first high refractive index layer and the second high refractive index layer in Comparative Example 2, and the fourth high refractive index layer and the third high refractive index layer in Example 3 are all TiO2layers formed by MF target power (n = 2.50, k = 0.00034); the rest are TiO2layers formed by HiPIMS target power (n = 2.70, k = 0.00226);

[0122] In Table 8, the fourth high refractive index layer and the third high refractive index layer in Example 5 are both TiO2layers formed by MF target power (n = 2.50, k = 0.00034), and the rest are TiO2layers formed by HiPIMS target power (n = 2.61, k = 0.00458); in Example 6, they are all TiO2layers formed by HiPIMS target power (n = 2.64, k = 0.00323); the rest of the examples and comparative examples are all TiO2layers formed by HiPIMS target power (n = 2.70, k = 0.00226).

[0123] In Table 9, the fourth high refractive index layer, the third high refractive index layer, the first high refractive index layer and the second high refractive index layer in Comparative Example 4 are all TiO2layers (n = 2.50, k = 0.00034) formed by an MF target power supply, the first high refractive index layer in Example 8 is a TiO2layer (n = 2.50, k = 0.00034) formed by an MF target power supply, and the rest are TiO2layers (n = 2.70, k = 0.00226) formed by a HiPIMS target power supply.

[0124] Table 4

[0125]

[0126]

[0127] Table 5

[0128]

[0129] Table 6

[0130]

[0131]

[0132] As can be seen from Comparative Example 1 and Comparative Example 2, after the anti-reflective film layer is coated on the outer surface of the rearview mirror lens in Example 1, the rear field of view and the display image of the rearview mirror are all free of ghosting, the image is clear and real, and the safety of vehicle driving is improved. Example 2 uses high-hardness ZrO x , SiZrO x film layers as high refractive index layer and low refractive index layer materials, which improves the durability of the rearview mirror film layer. After testing, the pencil hardness of the inner and outer surfaces of the rearview mirror is > 9H.

[0133] Table 7

[0134]

[0135]

[0136] The TiO2(n=2.50, k=0.00034) deposited by using MF power source in Comparative Example 2, the change of film thickness for improving the reflectivity of the rearview mirror, although the reflectivity is improved to 58.5, the mirror color is greenish (the a value in Lab value of visible light reflection of the mirror surface is negative), the angle color is bluish, greenish (the a value in Lab value of visible light reflection of 0°-45° is negative, the b value in Lab value of visible light reflection of 45°-60° is negative); the TiO2(n=2.70, k=0.00266) deposited by using HiPIMS power source in Example 2 and Example 3 and the adjustment of film structure, finally the reflectivity of 0°-60° is greater than 59%, the a and b values are neutral, and the image has no ghosting, which can clearly and truly reflect the rear view and the displayed image, improving the safety of vehicle driving.

[0137] Table 8

[0138]

[0139]

[0140] Comparative Example 3 uses Nb2O5(n=2.38, k=0.00021) as high refractive index material, and the visible light reflectivity is only 42.8%, which is quite different from 50%; Example 5 uses HiPIMS power source to deposit TiO2(n=2.61, k=0.00458), and the visible light reflectivity reaches 55.2%; Example 6 uses HiPIMS power source to deposit TiO2(n=2.64, k=0.00323), and the visible light reflectivity reaches 56.1%; Example 7 uses HiPIMS power source to deposit TiO2(n=2.70, k=0.00226), and the visible light reflectivity reaches 55.1%; and Example 5, Example 6 and Example 7 all coat an anti-reflection film layer on the outer surface of the rearview mirror lens, the image has no ghosting, which can clearly and truly reflect the rear view and the displayed image, improving the safety of vehicle driving.

[0141] Table 9

[0142]

[0143]

[0144] Comparative Example 4 is a back mirror lens coated with a double-sided anti-reflective film layer, which can greatly weaken the brightness of the secondary image, but the a value of the Lab value of the 15°-60° visible light reflectivity is positive, and the reflected rear view is red; by reasonably designing the semi-reflective and semi-transmissive film layer in Example 8 and Example 9, the a value of the Lab value of the 15°-60° visible light reflectivity is neutral when the anti-reflective film layer and the semi-reflective and semi-transmissive film layer are coated on the outer and inner surfaces of the back mirror lens. After adding the medium refractive layer, it can be seen that the a value of the Lab value of the 45°-60° visible light reflectivity is more neutral. Through reasonable film system design, the image of the back mirror lens of Example 8 and Example 9 has no ghosting, and the color of the 0°-60° reflected rear view is more neutral, which can clearly and truly reflect the displayed image of the rear view and the displayed image, and improve the safety of vehicle driving.

[0145] In summary, the present application deposits an anti-reflective film on the outer surface of the back mirror lens, and reasonably designs a semi-reflective and semi-transmissive film layer on the inner surface of the back mirror lens, so that the reflected rear view and the displayed reversing image of the back mirror have no ghosting and natural color, which enhances the reality of the back mirror and improves the safety of vehicle driving. The back mirror lens prepared by the preparation method provided by the present application has a reflectivity of 48-60%, a reflection a value (8°) of -3-0, a reflection b value (8°) of -1-1, a transmittance of 40-52%, and a transmittance a value (8°) of ≤3.5.

[0146] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in related technical fields based on the content of the specification and drawings of the present application is also included in the patent protection scope of the present application.

Claims

1. An augmented reality automotive interior rearview mirror assembly, characterized by, It includes a glass substrate, and a semi-reflective and semi-transparent film and an anti-reflective film formed on both sides of the glass substrate, respectively; ​ The antireflective coating comprises a third high-refractive-index layer, a third low-refractive-index layer, a fourth high-refractive-index layer, and a fourth low-refractive-index layer stacked sequentially; the refractive indices of the third and fourth high-refractive-index layers are 1.90 to 2.

72. The refractive indices of the third and fourth low-refractive-index layers are 1.46–1.60; the thickness of the third high-refractive-index layer is 5–30 nm. The thickness of the third low-refractive-index layer is 30–55 nm; The thickness of the fourth high-refractive-index layer is 15–45 nm; The thickness of the fourth low-refractive-index layer is 85–120 nm.

2. The automotive rearview mirror according to claim 1, wherein The material of the third high refractive index layer is selected from at least one of SiNx, SiAlNx, SiBNx, SiTiNx, SiZrNx, NbOx, ZrOx, and TiO2; Where 1 < x < 3.

3. The automotive rearview mirror according to claim 1, wherein The material of the third low-refractive-index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, and SiZrOx; Where 1 < x < 3.

4. The automotive rearview mirror according to claim 1, wherein The material of the fourth high refractive index layer is selected from at least one of SiNx, SiAlNx, SiBNx, SiTiNx, SiZrNx, NbOx, ZrOx, and TiO2; Where 1 < x < 3.

5. The automotive rearview mirror according to claim 1, wherein The material of the fourth low-refractive-index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, and SiZrOx; Where 1 < x < 3.

6. The automotive rearview mirror according to claim 1, wherein The semi-reflective and semi-transparent film includes at least one high refractive index layer formed on the surface of the glass substrate and at least one low refractive index layer formed on the surface of the high refractive index layer; In the semi-reflective and semi-permeable film, the refractive index of the high refractive index layer is 2.45 to 2.72; and the refractive index of the low refractive index layer is 1.46 to 1.

60.

7. The automotive rearview mirror according to claim 6, wherein The semi-reflective and semi-permeable membrane comprises a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer stacked sequentially.

8. The automotive rearview mirror according to claim 6, wherein, The semi-reflective and semi-permeable membrane comprises a first medium refractive index layer, a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer stacked sequentially. The refractive index of the first refractive index layer is 1.60 to 2.

45.

9. The automotive rearview mirror according to claim 6, wherein, The semi-reflective and semi-permeable membrane comprises a first intermediate refractive index layer, a first high refractive index layer, a first low refractive index layer, a second intermediate refractive index layer, a second high refractive index layer, and a second low refractive index layer stacked sequentially. The refractive indices of the first and second intermediate refractive index layers are 1.60 to 2.

45.

10. The automotive rearview mirror according to any one of claims 7 to 9, wherein, The first high refractive index layer and the second high refractive index layer are TiO2 films deposited by an MF power supply or a HiPIMS power supply, and the thickness of the first high refractive index layer and the second high refractive index layer is 35-65 nm.

11. The automotive rearview mirror according to any one of claims 7 to 9, wherein, The material of the first low refractive index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, and SiZrOx; Where 1 < x < 3, the thickness of the first low refractive index layer is 80–110 nm.

12. The automotive rearview mirror according to any one of claims 7 to 9, wherein, The material of the second low-refractive-index layer is selected from at least one of SiOx, SiBOx, SiTiOx, SiAlOx, SiZrOx; wherein 1 13. The automotive rearview mirror according to claim 8, wherein, The material of the first medium-refractive-index layer is selected from at least one of SiNxOy, SiBNxOy, SiTiNxOy, SiAlNxOy, SiZrNxOy, ZnOx, ZnAlOx, ZnSnOx, SiNx, Nb2O5, ZrOx, SiZrNx, SiAlNx, SiBNx, SiTiNx; wherein 1 14. The automotive rearview mirror according to claim 9, wherein, The material of the first medium-refractive-index layer and the second medium-refractive-index layer is selected from at least one of SiNxOy, SiBNxOy, SiTiNxOy, SiAlNxOy, SiZrNxOy, ZnOx, ZnAlOx, ZnSnOx, SiNx, Nb2O5, ZrOx, SiZrNx, SiAlNx, SiBNx, SiTiNx; wherein 1 15. The automotive rearview mirror according to claim 1, wherein, The automotive rearview mirror has an a value in the Lab value of the visible light reflection color: 3≤a≤0; a b value: 1≤b≤1; a visible light reflectance of 48≤R≤60.

16. The automotive rearview mirror according to claim 1, wherein, The automobile interior rearview mirror lens has an a value of a≤3.5 in the Lab value of visible light transmission color; and a visible light transmittance of 40≤T≤52.

17. A method of manufacturing an augmented reality automotive interior rearview mirror assembly, comprising: providing a mirror assembly comprising a housing, a mirror element, and a mirror element support structure; providing a display element; and coupling the display element to the mirror element support structure. The step of coating a semi-reflective and semi-transmissive film and a reflection-reducing film on two side surfaces of a glass substrate, respectively; The reflection-reducing film comprises a third high-refractive-index layer, a third low-refractive-index layer, a fourth high-refractive-index layer and a fourth low-refractive-index layer which are sequentially stacked; The third and fourth high-refractive-index layers have a refractive index of 1.90-2.72; The third and fourth low-refractive-index layers have a refractive index of 1.46-1.60; The third high-refractive-index layer has a thickness of 5-30 nm; The third low-refractive-index layer has a thickness of 30-55 nm; The fourth high-refractive-index layer has a thickness of 15-45 nm; The fourth low-refractive-index layer has a thickness of 85-120 nm.

18. The preparation method according to claim 17, characterized in that, The semi-reflective and semi-transmissive film comprises a first high-refractive-index layer, a first low-refractive-index layer, a second high-refractive-index layer and a second low-refractive-index layer which are sequentially stacked; The first and second high-refractive-index layers have a refractive index of 2.45-2.72; The first and second low-refractive-index layers have a refractive index of 1.46-1.

60.

19. The preparation method according to claim 17, characterized in that, The semi-reflective and semi-transmissive film comprises a first medium-refractive-index layer, a first high-refractive-index layer, a first low-refractive-index layer, a second high-refractive-index layer and a second low-refractive-index layer which are sequentially stacked; The first medium-refractive-index layer has a refractive index of 1.60-2.

45.

20. The preparation method according to claim 17, characterized in that, The semi-reflective and semi-transmissive film comprises a first medium-refractive-index layer, a first high-refractive-index layer, a first low-refractive-index layer, a second medium-refractive-index layer, a second high-refractive-index layer and a second low-refractive-index layer which are sequentially stacked; The first and second medium-refractive-index layers have a refractive index of 1.60-2.

45.

21. The method of any one of claims 18 to 20, wherein the method is carried out at a temperature of from 20°C to 30°C. The first and second high refractive index layers are TiO2 films deposited from an MF power source or a HiPIMS power source, and have a thickness of 35 to 65 nm.

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