Vehicle-mounted HUD dust cover and manufacturing method thereof

Abstract

The invention discloses a vehicle-mounted HUD dust cover and a manufacturing method thereof. The vehicle-mounted HUD dust cover comprises flexible glass, and the flexible glass comprises a VA area and a BM area surrounding the VA area; an optical function film is attached to the VA area; the optical function film in the VA area comprises an anti-reflection AR film, an infrared cut-off film and a polarization beam splitting film; the BM area is a black area surrounding the VA area, glass is adopted as a dust cover base material, functional optical treatment such as anti-reflection AR, infrared cut-off and polarization beam splitting is carried out on the surface of the glass base material according to different purposes and using environments, the HUD projection image quality is improved, and the problem of PGU failure caused by HUD sunlight backflow is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle-mounted electronic equipment, and in particular relates to a vehicle-mounted HUD dust cover and a manufacturing method thereof. Background Art

[0002] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

[0003] The car head-up display HUD mainly projects important information such as vehicle speed, instrumentation, navigation, etc. onto the windshield to avoid driving hazards caused by lowering the head while driving. It is a sophisticated photoelectric system. During use, dust in the air can easily settle into the HUD, affecting the projection light path of the HUD. Therefore, an optically transparent dust cover is set at the HUD exit. The dust cover needs to meet the protection performance without affecting the light path. The materials currently used in dust covers are mainly PMMA or PC, etc. These materials have single performance and environmental reliability defects, such as low image clarity, yellowing, and warping.

[0004] Most of the existing automotive HUD dust covers are made of materials such as PMMA / PC, which only meet basic protection performance. Long-term use may cause scratches, yellowing, and other problems, resulting in poor image quality. In order to meet special use environments, some products perform polarization splitting on the PC dust cover, and laminate the polarizer on both sides of the PC film to form a dust cover. The polarizer's selectivity for light is used to reduce the amount of external light entering, thereby preventing the PGU from failing due to high temperature. This type of dust cover has high requirements for the durability of the polarizer, and its performance stability is poor when used in a high temperature and high humidity environment for a long time. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a vehicle-mounted HUD dust cover and a method for manufacturing the same. Glass is used as the dust cover substrate, and the surface of the glass substrate is subjected to functional optical treatment according to different uses and usage environments, such as anti-reflection AR, infrared cutoff, and polarization splitting, so as to improve the HUD projection image quality and improve the PGU failure problem caused by HUD sunlight backflow.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vehicle-mounted HUD dust cover, comprising flexible glass, wherein the flexible glass comprises a VA area and a BM area surrounding the VA area; the VA area is attached with an optical functional film;

[0007] The optical functional films in the VA area include an anti-reflection AR film, an infrared cut-off film, and a polarized beam splitter film; the function of the anti-reflection AR film is to increase the light transmittance and improve the light efficiency utilization rate of the HUD. The function of the infrared cut-off film is to block the light entering the infrared band (700-1500nm) to prevent the backflow of sunlight and burn the PGU. The function of the polarized beam splitter film is to reduce the amount of light entering the visible light band (400-700nm) to prevent the backflow of sunlight and burn the PGU.

[0008] The BM region is a black area surrounding the VA region.

[0009] The flexible glass is connected to the HUD light outlet through an adhesive layer; the thickness of the flexible glass is 30 to 500 μm; the black area of ​​the BM region includes but is not limited to black ink and black OCA.

[0010] The flexible glass material used as the substrate includes but is not limited to soda-lime glass, aluminosilicate glass, quartz glass, and high-silica glass.

[0011] The optical functional film in the VA zone has film-forming methods including but not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and Czochralski coating; the optical functional film in the VA zone has dielectric film materials including but not limited to MgF2, SiO2, Al2O3, TiO2, Cr2O3, HfO2, In2O3, Ta2O5, Yb2O3, and ZrO2. The vacuum coating method (vacuum magnetron sputtering, vacuum evaporation) of the optical thin film forming method in the VA zone forms a uniform and dense film layer with high quality, good wear resistance, corrosion resistance, and optical properties. The wet coating method (spraying, spin coating, Czochralski coating) of the optical thin film forming method in the VA zone has simple process, low cost, and high coating efficiency.

[0012] The polarization splitting film, its polarization splitting method includes but is not limited to dielectric film polarization splitting, metal grating polarization splitting, and dichroic polarization splitting. These are different methods to achieve polarization splitting, and the function is to achieve polarization splitting. The dielectric film polarization splitting is designed based on the unequal effective refractive index of the P polarization and S polarization of the film material. The advantage is that the selection of substrate and film materials has greater flexibility. The metal grating polarization splitting is made of parallel metal film wire grids arranged at equal intervals on a transparent substrate, which can achieve good durability in a high temperature environment. The dichroic polarization splitting process is mature and low-cost. It can be easily made into a large-area polarizing film, and can achieve a polarization degree of more than 98% in the entire visible light spectrum.

[0013] If the polarization splitting film is made by a dielectric film polarization splitting method, the film forming method includes but is not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating.

[0014] If the polarization splitting film adopts the metal grid polarization splitting method, the types of metal grid manufacturing processes include: ① using nanoimprinting to form a metal wire grid structure, combining thin film technology to deposit metal thin film; ② using thin film deposition technology to deposit metal thin film, coating photoresist on the metal film, and then exposing the photoresist by EBL method, and finally forming a metal grid structure by ICP or RIE etching. Advantages of process ①: simple process flow and low cost. Advantages of process ②: high fidelity of the metal wire grid simulation design structure and better polarization splitting effect.

[0015] The cross-sectional shape of the metal grid includes but is not limited to rectangle, trapezoid, triangle, and parabola; the height of the metal grid is 50 to 500 nm, the line width of the metal grid is 10 to 500 nm, and the period of the metal grid is 20 to 1000 nm; the metal grid material is a metal material with good conductivity, high temperature resistance, and small expansion coefficient, including but not limited to Al, Ag, and Au. The metal grid material is selected from materials such as Al, Ag, and Au, and the prepared metal grid polarization splitting film has good environmental reliability, is almost not affected by the ambient temperature, etc., and has good polarization performance.

[0016] The film forming method of the photoresist (referring to which one) includes but is not limited to scraping, spin coating, spraying, and silk screen printing.

[0017] The polarizing layer of the polarization splitting film includes but is not limited to PVA and glass nanoparticles; the dichroic polarization splitting film is a composite material, including but not limited to iodine-based materials and dichroic dye-based materials; when the polarizing layer of the dichroic polarization splitting film adopts PVA, the HUD dust cover includes a polarizing layer doped with a composite material, and a flexible glass is arranged on the polarizing layer, and the polarizing layer and the flexible glass are bonded by optical glue; the optical glue includes but is not limited to OCA, OCR, and PSA. The dichroic polarization splitting film adopts the flexible glass independently developed by Changxin, and the dust cover prepared is highly bendable, the product has high environmental reliability, and is not prone to deformation, yellowing, etc.

[0018] One of the above technical solutions has the following advantages or beneficial effects: glass is used as the dust cover substrate, and the surface of the glass substrate is subjected to functional optical treatment according to different uses and usage environments, such as anti-reflection AR, infrared cutoff, and polarization splitting, so as to improve the HUD projection image quality and improve the PGU failure problem caused by HUD sunlight backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a vehicle-mounted HUD dust cover provided in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the vehicle HUD dust cover;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the vehicle HUD dust cover;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the vehicle HUD dust cover;

[0023] Figure 5 for Figure 1 Schematic diagram of the structure of the vehicle HUD dust cover; DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0025] Embodiment 1

[0026] See also Figures 1 to 5 A vehicle-mounted HUD dust cover includes flexible glass, the flexible glass includes a VA area and a BM area surrounding the VA area; the VA area is attached with an optical functional film; the optical functional film in the VA area includes an anti-reflection AR film, an infrared cut-off film, and a polarization splitter film; the BM area is a black area surrounding the VA area. By utilizing the characteristic that the flexible glass is easy to deform, the adhesive layer is connected to the HUD light outlet. Since the HUD dust cover has specific optical properties, the image quality of the vehicle-mounted HUD projection is guaranteed, and the entry of external light can be reduced, avoiding the failure of the PGU due to high temperature, and extending the service life of the HUD.

[0027] The flexible glass is connected to the HUD light outlet through an adhesive layer; the thickness of the flexible glass is 30 to 500 μm; the black area of ​​the BM region includes but is not limited to black ink and black OCA.

[0028] The flexible glass material used as the substrate includes but is not limited to soda-lime glass, aluminosilicate glass, quartz glass, and high-silica glass.

[0029] The optical functional films in the VA area may be formed by methods including but not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and Czochralski coating; the optical functional films in the VA area may be formed by dielectric film materials including but not limited to MgF2, SiO2, Al2O3, TiO2, Cr2O3, HfO2, In2O3, Ta2O5, Yb2O3, and ZrO2.

[0030] Polarization splitting film, its polarization splitting methods include but are not limited to dielectric film polarization splitting, metal grid polarization splitting, and dichroic polarization splitting.

[0031] If the polarization splitting film is formed by a dielectric film polarization splitting method, the film forming method includes but is not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating.

[0032] If the polarization splitting film adopts the metal grid polarization splitting method, the types of metal grid manufacturing processes include: ① using nanoimprinting to form a metal wire grid structure, combining thin film technology to deposit metal thin film; ② using thin film deposition technology to deposit metal thin film, coating photoresist on the metal film, and then exposing the photoresist through EBL method, and finally forming a metal grid structure through ICP or RIE etching.

[0033] The cross-sectional shape of the metal gate includes but is not limited to rectangle, trapezoid, triangle, and parabola; the metal gate height is 50 to 500 nm, the metal gate line width is 10 to 500 nm, and the metal gate period is 20 to 1000 nm; the metal gate material is a metal material with good conductivity, high temperature resistance and small expansion coefficient, including but not limited to Al, Ag, and Au.

[0034] The film forming methods of photoresist (referring to which one) include but are not limited to scraping, spin coating, spraying, and silk screen printing.

[0035] The polarizing layer of the polarization splitting film includes but is not limited to PVA and glass nanoparticles; the dichroic polarization splitting film is a composite material, including but not limited to iodine-based materials and dichroic dye-based materials; when the polarizing layer of the dichroic polarization splitting film adopts PVA, the HUD dust cover includes a polarizing layer doped with the composite material, and a flexible glass is arranged on the polarizing layer, and the polarizing layer and the flexible glass are bonded by optical adhesive; the optical adhesive includes but is not limited to OCA, OCR, and PSA.

[0036] After adopting the above solution, glass is used as the dust cover substrate, and the surface of the glass substrate is subjected to functional optical treatment according to different purposes and usage environments, such as anti-reflection AR, infrared cutoff, and polarization splitting, etc., to improve the HUD projection image quality and improve the PGU failure problem caused by HUD sunlight backflow.

[0037] Embodiment 2

[0038] A vehicle-mounted HUD dust cover and a manufacturing method thereof, wherein the vehicle-mounted HUD dust cover comprises flexible glass, wherein the flexible glass comprises a VA region and a BM region with optical functional films attached thereto. The optical functional films comprise an anti-reflection AR film, an infrared cut-off film, a polarized beam splitting film, etc. in the VA region. The BM region is a black region surrounding the VA region. The vehicle-mounted HUD dust cover, by utilizing the characteristic that the flexible glass is easily deformed, is connected to the HUD light outlet by an adhesive layer. Since the HUD dust cover has specific optical properties, the quality of the vehicle-mounted HUD projection image is guaranteed, and the entry of external light can be reduced, thereby avoiding the failure of the PGU due to high temperature and extending the service life of the HUD.

[0039] The thickness of the flexible glass of the vehicle-mounted HUD dust cover is 30 to 500 μm, the optical film in the VA area of ​​the flexible glass includes but is not limited to an anti-reflection AR film, an infrared cut-off film and a polarization splitter film, and the black area of ​​the flexible glass BM includes but is not limited to black ink and black OCA.

[0040] The flexible glass substrate of the vehicle-mounted HUD dust cover includes but is not limited to soda-lime glass, aluminosilicate glass, quartz glass, and high-silica glass.

[0041] The flexible glass substrate of the vehicle-mounted HUD dust cover is a flexible glass substrate that has been thinned, cut, CNC-cut, and chemically strengthened.

[0042] The optical film in the VA area of ​​the vehicle-mounted HUD dust cover is deposited on one side or on both sides.

[0043] The optical film in the VA area of ​​the vehicle-mounted HUD dust cover, the dielectric film material of which includes but is not limited to MgF2, SiO2, Al2O3, TiO2, Cr2O3, HfO2, In2O3, Ta2O5, Yb2O3, and ZrO2.

[0044] The optical film in the VA area of ​​the vehicle-mounted HUD dust cover is formed by methods including but not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating, and the thickness of the film layer is not limited.

[0045] The vehicle-mounted HUD dust cover polarization splitting film, the polarization splitting scheme of which includes but is not limited to dielectric film polarization splitting, metal grid polarization splitting, and dichroic polarization splitting.

[0046] The polarized beam splitting film of the vehicle-mounted HUD dust cover adopts a dielectric film polarized beam splitting solution, and its film forming methods include but are not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating, and the thickness of the film layer is not limited.

[0047] The polarized beam splitting film of the vehicle-mounted HUD dust cover adopts a metal grid polarized beam splitting solution, and its metal grid manufacturing process includes but is not limited to the following solutions: Solution 1, nano-imprinting is used to form a metal wire grid structure, and the metal film is deposited in combination with thin film technology; Solution 2, thin film deposition technology is used to deposit the metal film, photoresist is coated on the metal film, and then the photoresist is exposed by EBL and other methods, and finally the metal grid structure is formed by etching by ICP / RIE and other methods.

[0048] The cross-sectional shape of the metal grille of the vehicle-mounted HUD dust cover includes but is not limited to a rectangle, a trapezoid, a triangle, a parabola, and a bullet shape.

[0049] The metal grid height of the vehicle-mounted HUD dust cover is 50 to 500 nm, the metal grid line width is 10 to 500 nm, and the metal grid period is 20 to 1000 nm.

[0050] The metal grid material of the vehicle-mounted HUD dust cover is a metal material with good conductivity, high temperature resistance and small expansion coefficient, including but not limited to Al, Ag, and Au.

[0051] The film forming methods of the vehicle-mounted HUD dust cover photoresist include but are not limited to scraping, spin coating, spraying, and silk screen printing, and the thickness of the film layer is not limited.

[0052] The polarized splitter film of the vehicle-mounted HUD dust cover adopts a dichroic polarized splitter solution. The principle is to uniaxially stretch the polarizing layer doped with a special composite material so that the composite is roughly arranged in one direction. When the polarization direction of light is consistent with this direction, it is strongly absorbed, while light perpendicular to this direction is transmitted.

[0053] The vehicle-mounted HUD dust cover dichroic polarization splitting film polarizing layer substrate includes but is not limited to plastic (PVA) and glass nanoparticles.

[0054] The vehicle-mounted HUD dust cover dichroic polarization splitting film composite material includes but is not limited to iodine-based materials and dichroic dye-based materials.

[0055] When the polarizing layer of the dichroic polarization splitting film of the vehicle-mounted HUD dust cover adopts plastic (PVA), the HUD dust cover includes a polarizing layer doped with a composite material, a flexible glass is arranged on the upper layer of the polarizing layer, a protective film is arranged on the lower layer of the polarizing layer, and the polarizing layer and the flexible glass (protective film) are bonded by optical adhesive.

[0056] The optical adhesive for the vehicle-mounted HUD dust cover includes but is not limited to OCA, OCR, and PSA.

[0057] The protective film of the vehicle-mounted HUD dust cover includes but is not limited to TAC, PC, PET, and PMMA.

[0058] After adopting the above solution, glass is used as the dust cover substrate, and the surface of the glass substrate is subjected to functional optical treatment according to different purposes and usage environments, such as anti-reflection AR, infrared cutoff, and polarization splitting, etc., to improve the HUD projection image quality and improve the PGU failure problem caused by HUD sunlight backflow.

[0059] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted HUD dust cover, characterized in that: The flexible glass comprises a VA region and a BM region surrounding the VA region; the VA region is provided with an optical functional film; The optical functional films in the VA zone include an anti-reflection AR film, an infrared cut-off film, and a polarization splitting film; The BM region is a black area surrounding the VA region.

2. The vehicle-mounted HUD dust cover according to claim 1, characterized in that: The flexible glass is connected to the HUD light outlet through a glue layer; the thickness of the flexible glass is 30 to 500 μm; the black area of ​​the BM region includes but is not limited to black ink and black OCA.

3. The vehicle-mounted HUD dust cover according to claim 2, characterized in that: The flexible glass material used as the substrate includes but is not limited to soda-lime glass, aluminosilicate glass, quartz glass, and high-silica glass.

4. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 3, characterized in that: The optical functional film in the VA area includes, but is not limited to, vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating; the optical functional film in the VA area includes, but is not limited to, MgF2, SiO2, Al2O3, TiO2, Cr2O3, HfO2, In2O3, Ta2O5, Yb2O3, and ZrO2.

5. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 4, characterized in that: The polarization splitting film, and its polarization splitting methods include but are not limited to dielectric film polarization splitting, metal grid polarization splitting, and dichroic polarization splitting.

6. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 5, characterized in that: If the polarization splitting film is made by a dielectric film polarization splitting method, the film forming method includes but is not limited to vacuum magnetron sputtering, vacuum evaporation, spraying, spin coating, and pulling coating.

7. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 5, characterized in that: If the polarization splitting film adopts the metal grid polarization splitting method, the types of metal grid manufacturing processes include: ① using nanoimprinting to form a metal wire grid structure, combining thin film technology to deposit metal thin film; ② using thin film deposition technology to deposit metal thin film, coating photoresist on the metal film, and then exposing the photoresist through EBL method, and finally forming a metal grid structure through ICP or RIE etching.

8. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 7, characterized in that: The cross-sectional shape of the metal gate includes but is not limited to a rectangle, a trapezoid, a triangle, and a parabola; the height of the metal gate is 50 to 500 nm, the line width of the metal gate is 10 to 500 nm, and the period of the metal gate is 20 to 1000 nm; the material of the metal gate is a metal material with good conductivity, high temperature resistance, and a small expansion coefficient, including but not limited to Al, Ag, and Au.

9. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 8, characterized in that: The film forming method of the photoresist includes but is not limited to scraping, spin coating, spraying, and silk screen printing.

10. The method for manufacturing a vehicle-mounted HUD dust cover according to claim 8, characterized in that: The polarizing layer of the polarization splitting film includes but is not limited to PVA and glass nanoparticles; the dichroic polarization splitting film is a composite material, including but not limited to iodine-based materials and dichroic dye-based materials; when the polarizing layer of the dichroic polarization splitting film adopts PVA, the HUD dust cover includes a polarizing layer doped with the composite material, and a flexible glass is arranged on the polarizing layer, and the polarizing layer and the flexible glass are bonded by optical adhesive; the optical adhesive includes but is not limited to OCA, OCR, and PSA.

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