Head-up display film and head-up display system

Abstract

The invention discloses a head-up display film and a head-up display system, the head-up display film comprises a shielding layer, a reflection increasing film, a bonding layer and a protection layer which are stacked in sequence, one surface, deviating from the bonding layer, of the protection layer is provided with an anti-dazzle layer, the thickness of the protection layer is 0.1-1 mm, the thickness of the anti-dazzle layer is 2-6 [mu] m, and the haze value of the anti-dazzle layer is 5-12%. The reflection increasing film with the blackened back is attached to the lower position of the inner surface of the front windshield, the thin protection layer is attached to the surface of the film, the anti-dazzle layer is arranged on the protection layer to improve the haze, ghosting can be effectively eliminated, a traditional instrument panel and a traditional central control screen can be replaced, and the anti-dazzling effect is achieved. And a more convenient way for obtaining the vehicle condition and road condition information is provided.

Description

Technical Field

[0001] The present invention belongs to the technical field of head-up display, and in particular relates to a head-up display film and a head-up display system. Background Art

[0002] HUD, or head-up display, is a device that projects information into the driver's field of vision, allowing the driver to obtain necessary information while keeping his sight forward. Studies have found that when the driver looks at the instrument cluster, he needs to lower his head 20-25 degrees, but when looking at the HUD, he almost does not need to lower his head, and can obtain the content with only the peripheral vision of his eyes. Therefore, the driver's attention will not be distracted by checking the in-vehicle information, which can greatly improve driving safety.

[0003] After decades of development, many types of vehicle-mounted HUDs have emerged, but no matter which type of HUD, they all need to solve the same problem, that is, the ghosting phenomenon caused by the reflection of light on the front and back surfaces of the glass. To solve the ghosting phenomenon caused by glass reflection, people have tried to solve it through two solutions: wedge-shaped PVB film and P-light transparent nano-reflective film. The ghosting problem has also been significantly improved, but these solutions all have some problems to a greater or lesser extent.

[0004] The wedge-shaped PVB film solution is to sandwich a layer of PVB film with a wedge angle in the middle of the windshield, presenting a sandwich structure, and the middle PVB film is wide at the top and narrow at the bottom, changing the direction of the reflected light on the inner and outer surfaces of the glass, so that the two ghost images overlap, thereby eliminating the ghost. Currently, the wedge-shaped PVB film is still the mainstream solution to the ghost problem, but this method also has certain disadvantages. The wedge angle will be affected by the position of the image source and the angle of incidence, so the HUD needs to be customized for each model, which restricts the mass production of HUD; secondly, in practice, there will still be ghosting due to installation deviations of the windshield and HUD; finally, because the HUD system usually has a specific effective viewing angle range, observers outside this range cannot fully receive the correct projected image.

[0005] The P-light transparent nano-reflective film solution is to sandwich a layer of P-light reflective film in the middle of the windshield, and the projection light machine emits P-light, and adjusts the incident angle of P-light near the Brewster angle, so as to reduce the reflectivity of the first interface of the glass to near zero, and only the light reflected by the P-light reflective film on the second interface enters the human eye, thereby eliminating ghosting. Compared with the wedge-shaped PVB film, this solution is simpler and less expensive, and it also solves the lateral ghosting problem that the wedge-shaped PVB film cannot solve. However, this solution has more stringent design requirements for the incident angle, and different designs are required for different models; in addition, when the incident angle is based on the Brewster angle and floats within a certain range above and below, the brightness of the P-light reflected image will be less than 1% of the original image, which means that the imaging brightness may also be affected.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The object of the present invention is to provide a head-up display film and a head-up display system, which can eliminate the ghosting produced by the front windshield under the wide viewing angle of the vehicle-mounted HUD, eliminate the Tyndall effect, and improve the clarity of the image.

[0008] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0009] A head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer and a protective layer which are stacked in sequence, wherein an anti-glare layer is arranged on a side of the protective layer away from the adhesive layer, the thickness of the protective layer is 0.1 to 1 mm, the thickness of the anti-glare layer is 2 to 6 μm, and the haze value of the anti-glare layer is 5 to 12%.

[0010] In one or more embodiments of the present invention, the anti-glare layer is a resin coating layer to which optical particles are added, and the optical particles are selected from PMMA particles and silica particles.

[0011] In one or more embodiments of the present invention, the PMMA particles have a particle size of 2 to 4 μm; and the mass proportion of the PMMA particles in the resin is 1 to 10%.

[0012] In one or more embodiments of the present invention, the silica particles are selected from micron-sized silica and nano-sized silica.

[0013] In one or more embodiments of the present invention, the mass proportion of the micron-sized silicon dioxide in the resin is 3-12%.

[0014] In one or more embodiments of the present invention, the particle size of the micron-sized silicon dioxide is 0.5-1.5 μm.

[0015] In one or more embodiments of the present invention, the nano-scale silica is added to the resin in the form of silica sol, the mass proportion of silica particles in the silica sol in the resin is 5-15%; the particle size of the silica particles in the silica sol is 50-200 nm.

[0016] In one or more embodiments of the present invention, the anti-reflection film includes a substrate layer, a hard coating layer, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer stacked in sequence, and the shielding layer is disposed on one side of the substrate layer.

[0017] In one or more embodiments of the present invention, the protective layer is made of glass or resin.

[0018] Another specific embodiment of the present invention provides a technical solution as follows:

[0019] A head-up display system comprises a front windshield, a projection device and the head-up display film, wherein the head-up display film is arranged on the front windshield, and the projection device is used for emitting a light signal to the head-up display film.

[0020] Compared with the prior art, the present invention utilizes an anti-reflection film with a black back side attached to the lower inner surface of the front windshield, and attaches a protective layer to the surface of the anti-reflection film, and an anti-glare layer is arranged on the protective layer. By controlling the thickness of the protective layer and the haze value of the anti-glare layer, the ghosting phenomenon produced by the front windshield at a wide viewing angle can be eliminated, thereby achieving a clear image without ghosting at the driving position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a head-up display film in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of an anti-reflection film in one embodiment of the present invention;

[0024] Figure 3 FIG. 1 is a schematic diagram of the structure of a head-up display system in one embodiment of the present invention.

[0025] Description of main reference numerals:

[0026] 1. Shielding layer; 2. Anti-reflection film; 3. Adhesive layer; 4. Protective layer; 5. Anti-glare layer; 6. Base material layer; 7. Hard coating layer; 8. Silicon layer; 9. Ni-Cr alloy layer; 10. Silicon dioxide layer. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] A specific embodiment of the present invention provides a head-up display film, such as Figure 1 As shown, it includes a shielding layer 1, an anti-reflection film 2, an adhesive layer 3 and a protective layer 4 which are stacked in sequence. The side of the protective layer 4 facing away from the adhesive layer 3 is provided with an anti-glare layer 5. The thickness of the protective layer 4 is 0.1 to 1 mm, the thickness of the anti-glare layer 5 is 2 to 6 μm, and the haze value of the anti-glare layer 5 is 5 to 12%.

[0029] Specifically, the shielding layer 1 is an ink layer. The shielding layer 1 is used to present an image, which can block external light and reduce the interference of external light, which is beneficial to improving the clarity of image display. The thickness of the shielding layer 1 only needs to be light-proof, and generally >0.1mm is light-proof. The adhesive layer selects the conventional OCA optical glue in the field. During preparation, the coating thickness of the OCA optical glue can be selected as 25μm or 38μm; the anti-reflection film 2 is used to reflect the light emitted by the projection equipment. The protective layer 4 is made of glass or resin material. According to the light transmittance of the protective layer 4, the material with a total light transmittance of more than 90% is preferred. The thickness of the protective layer 4 can be selected from 1mm, 0.5mm and 0.1mm. In addition, in terms of area size, the protective layer 4 should be larger than the anti-reflection film 2 to better protect the anti-reflection film 2.

[0030] The thickness of the front windshield is generally 5 to 7 mm. The ghosting occurs because two equal-sized, non-overlapping images appear on the inner and outer reflection interfaces of the front windshield, and the distance between the two images is positively correlated with the thickness of the glass, that is, the thinner the glass thickness, the closer the distance between the two ghost images, and the less likely it is to produce ghosting. The present invention reduces the ghosting phenomenon by controlling the thickness of the protective layer 4. In addition, the protective layer 4 is used to receive light from the projection device, and the reflection of light is prone to produce the Tyndall effect, which affects the driving experience and driving safety. By arranging an anti-glare layer 5 on the protective layer 4 and controlling the haze of the anti-glare layer 5, the Tyndall effect is eliminated. Moreover, the small amount of ghosting caused by the thickness of the protective layer 4 can also be blurred, which can further eliminate the ghosting, and finally achieve the effect of eliminating the ghosting.

[0031] Furthermore, the anti-glare layer 5 is a resin coating layer added with optical particles, and the optical particles are selected from PMMA particles and silicon dioxide particles.

[0032] Specifically, when PMMA particles are selected as optical particles, the mass proportion of PMMA particles in the resin is 1-10%, and the particle size of PMMA particles is 2-4 μm; when silica particles are selected as optical particles, micron-sized silica with a particle size of 0.5-1.5 μm can be selected, and the mass proportion of micron-sized silica in the resin is 3-12%, or nano-sized silica can be selected, and nano-sized silica is added to the resin in the form of silica sol, and silica sol is a dispersion of nano-silicon dioxide in water or solvent, and the particle size of silica particles in the silica sol is 50-200 nm, and the mass proportion of silica particles in the silica sol in the resin is 5-15%.

[0033] The resin is a conventional resin in the art, and specifically acrylic resin can be selected. Adding optical particles to the resin can increase the haze of the anti-glare layer 5, and by controlling the particle size and addition amount of the optical particles, the haze value of the anti-glare layer 5 can meet 5-12%. While not affecting the visual effect, it can also reduce the Tyndall effect, thereby achieving the purpose of eliminating ghosting.

[0034] In addition, the anti-glare layer 5 is disposed on the protective layer 4 by spraying, so that the anti-glare layer 5 and the protective layer 4 are firmly connected, the occurrence of edge warping is reduced, and the durability is high.

[0035] Further, such as Figure 2 As shown, the anti-reflection film 2 includes a substrate layer 6, a hard coating layer 7, a silicon layer 8, a nickel-chromium alloy layer 9, and a silicon dioxide layer 10 which are stacked in sequence, and the shielding layer 1 is arranged on one side of the substrate layer 6.

[0036] Specifically, the substrate layer 6 can be a PET substrate with a thickness of 100μm, 125μm, or 188μm. According to the light transmittance of the anti-reflection film 2, a PET substrate with a total light transmittance of more than 90% is preferred. The hard coating layer 7 is an acrylic resin layer with a thickness of 3 to 5μm; the silicon layer 8 has a thickness of 1 to 10nm; the nickel-chromium alloy layer 9 has a thickness of 25 to 35nm; and the silicon dioxide layer 108 has a thickness of 90 to 110nm. The anti-reflection film 2 can reflect P-polarized light, S-polarized light, and natural light, and has strong adaptability. At present, drivers are accustomed to wearing polarized glasses, generally P-polarized glasses. If the projection equipment emits S-polarized light, the driver cannot see any image and is not suitable. The anti-reflection film 2 in the present invention can solve this problem and has a wide range of applications.

[0037] Another specific embodiment of the present invention provides a head-up display system, such as Figure 3 As shown, it includes a front windshield, a projection device and the above-mentioned head-up display film, the head-up display film is arranged on the front windshield, and the projection device is used to emit a light signal to the head-up display film.

[0038] The present invention is further described in detail below in conjunction with specific embodiments.

[0039] Example 1

[0040] Preparation of anti-reflection film:

[0041] The total thickness of the anti-reflection film is 125μm, including a PET substrate, an acrylic resin layer, a silicon layer, a nickel-chromium alloy layer and a silicon dioxide layer stacked in sequence, wherein the acrylic resin layer is 5μm thick, the silicon layer is 10nm thick, the nickel-chromium alloy layer is 30nm thick, and the silicon dioxide layer is 100nm thick.

[0042] Take a PET substrate, and coat a layer of acrylic resin on the PET substrate by a precision wet coating process. After coating, use a magnetron sputtering process to plate silicon, nickel chromium and silicon dioxide on the acrylic resin layer to obtain an anti-reflection film.

[0043] Example 2

[0044] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 1 mm.

[0045] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 5%.

[0046] Example 3

[0047] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 0.5 mm.

[0048] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 5%.

[0049] Example 4

[0050] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 0.2 mm.

[0051] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 5%.

[0052] Example 5

[0053] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 1 mm.

[0054] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 15%.

[0055] Example 6

[0056] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 0.5 mm.

[0057] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 15%.

[0058] Example 7

[0059] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 0.2 mm.

[0060] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 15%.

[0061] Comparative Example 1

[0062] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 2 mm.

[0063] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin added with silica sol is sprayed on the surface of the protective layer to form an anti-glare layer. The spraying thickness is 2μm, and the mass proportion of silica particles in the silica sol in the acrylic resin is 5%.

[0064] Comparative Example 2

[0065] The head-up display film comprises a shielding layer, an anti-reflection film, an adhesive layer, a protective layer and an anti-glare layer which are stacked in sequence. The anti-reflection film is the anti-reflection film in Example 1, with a thickness of 125 μm; the protective layer is Fuyao head-up display glass, with a thickness of 0.5 mm.

[0066] During the preparation, ink is applied on one side of the anti-reflection film substrate layer to form a shielding layer, a 38μm thick OCA optical glue is applied on the side of the anti-reflection film away from the shielding layer, the protective layer is adhered to the anti-reflection film, and then an acrylic resin without adding silica sol is sprayed on the surface of the protective layer to form an anti-glare layer with a spraying thickness of 2μm.

[0067] The specific model of the acrylic resin used in the present invention is Arakawa Chemical CHT-X1, and the silicon dioxide content in the silica sol used is 30%.

[0068] The ghosting amount is calculated as follows: Wherein, d is the width of the main line, L is the distance between the ghost line with the largest deviation of the virtual image ghost and the corresponding main line, VID is the virtual image distance, that is, the distance from the human eye to the virtual image, and the ghosting amount should not exceed 3′.

[0069] Virtual image distance Among them, f is the distance from the imaging point of the virtual image acquisition device to the center of the virtual image, B is the distance between the driver's eyes, which is generally 65mm, and x L and xR They are respectively the horizontal position values ​​of the system virtual image center point mark on the imaging surface of the virtual image acquisition device after the virtual image acquisition device moves left and right by 32.5 mm based on the virtual image acquisition reference posture.

[0070] The head-up display films in the embodiments and comparative examples were attached to the inner surface of the front windshield using OCA optical adhesive, and a P light machine was used to emit P polarized light to the head-up display film. The performance of the head-up display film was tested, and the results are shown in Table 1.

[0071] Table 1 Performance test results

[0072]

[0073]

[0074] Combined with the data in Table 1, in Example 2, the ghosting is within an acceptable range, and the image clarity is very clear; in Example 3, the ghosting is within an acceptable range, the naked eye can hardly distinguish it, and the image clarity is very clear; in Example 4, it can be considered that there is no ghosting phenomenon, and the image clarity is very clear; in Example 5, the ghosting is within an acceptable range, and the image clarity is relatively clear; in Example 6, the ghosting is within an acceptable range, the naked eye can hardly distinguish it, and the image clarity is relatively clear; in Example 7, it can be considered that there is no ghosting phenomenon, and the image clarity is relatively clear; in Comparative Example 1, the ghosting phenomenon is serious, and the image clarity is very clear; in Comparative Example 2, the ghosting amount is within an acceptable range, the naked eye can hardly distinguish it, and the image is very clear, but the visual effect caused by the Tyndall effect is very poor, affecting driving safety.

[0075] In summary, the thickness of the protective layer is positively correlated with the amount of ghosting, that is, the relative distance between the two ghost images, and the haze value of the anti-glare layer is negatively correlated with the clarity of the ghosting virtual image. By controlling the thickness of the protective layer to 0.1-1 mm, and adding optical particles to the anti-glare layer to control the haze value of the anti-glare layer to 5-12%, ghosting can be effectively eliminated, and the haze value in this range can blur the small amount of ghosting caused by the thickness of the protective layer, further eliminating ghosting, and ultimately achieving a ghost-free image at the driving seat, solving the ghosting problem that plagues the vehicle-mounted HUD and improving driving safety.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0077] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A head-up display film, characterized in that: The invention comprises a shielding layer, an anti-reflection film, an adhesive layer and a protective layer which are stacked in sequence. The side of the protective layer away from the adhesive layer is provided with an anti-glare layer. The thickness of the protective layer is 0.1 to 1 mm. The thickness of the anti-glare layer is 2 to 6 μm. The haze value of the anti-glare layer is 5 to 12%.

2. The head-up display film according to claim 1, characterized in that: The anti-glare layer is a resin coating layer added with optical particles, and the optical particles are selected from PMMA particles and silicon dioxide particles.

3. The head-up display film according to claim 2, characterized in that: The particle size of the PMMA particles is 2-4 μm; the mass proportion of the PMMA particles in the resin is 1-10%.

4. The head-up display film according to claim 2, characterized in that: The silicon dioxide particles are selected from micron-sized silicon dioxide and nano-sized silicon dioxide.

5. The head-up display film according to claim 4, characterized in that: The mass proportion of the micron-sized silicon dioxide in the resin is 3-12%.

6. The head-up display film according to claim 4, characterized in that: The particle size of the micron-sized silicon dioxide is 0.5 to 1.5 μm.

7. The head-up display film according to claim 4, characterized in that: The nano-scale silicon dioxide is added to the resin in the form of silica sol, the mass proportion of silicon dioxide particles in the silica sol in the resin is 5-15%; the particle size of the silicon dioxide particles in the silica sol is 50-200nm.

8. The head-up display film according to claim 1, characterized in that: The anti-reflection film comprises a substrate layer, a hard coating layer, a silicon layer, a nickel-chromium alloy layer, and a silicon dioxide layer which are stacked in sequence, and the shielding layer is arranged on one side of the substrate layer.

9. The head-up display film according to claim 1, characterized in that: The material of the protection layer is glass or resin.

10. A head-up display system, characterized in that: The invention comprises a front windshield, a projection device and a head-up display film according to any one of claims 1 to 9, wherein the head-up display film is arranged on the front windshield, and the projection device is used for emitting a light signal to the head-up display film.

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