Vehicle-mounted display screen module and preparation method thereof

Abstract

The application relates to the technical field of vehicle-mounted display, in particular to a vehicle-mounted display screen module and a preparation method thereof. The vehicle-mounted display screen module comprises, from bottom to top, a display panel assembly, an optical bonding layer and a cover plate assembly which are sequentially stacked. The optical bonding layer comprises a first optical adhesive layer and a second optical adhesive layer which are stacked, and the refractive index of the first optical adhesive layer is greater than that of the second optical adhesive layer. The display panel assembly comprises a TFT array substrate, a CF substrate group and a liquid crystal layer. A black matrix plating layer is arranged on the metal wiring of the TFT array substrate and used for absorbing visible light which is incident from the side of the cover plate assembly and irradiated to the TFT array substrate after passing through the CF substrate group and the liquid crystal layer. The vehicle-mounted display screen module can completely eliminate interface reflection as much as possible by adding the black matrix plating layer and selecting the double-layer optical adhesive layer, thereby effectively reducing the total reflectivity of the vehicle-mounted display screen module, and significantly improving the visual experience and driving safety.

Description

Technical Field

[0001] This invention relates to the field of vehicle display technology, specifically to a vehicle display module and its manufacturing method. Background Technology

[0002] With the development of intelligent vehicles, in-vehicle displays are evolving towards larger sizes, higher resolutions, and multi-screen configurations to meet users' higher demands for human-computer interaction experiences. However, the in-vehicle environment has its own unique characteristics, facing strong external ambient light interference, such as direct sunlight, which makes the surface of in-vehicle displays highly susceptible to specular reflection. This reflection not only seriously affects the user's visual comfort, causing visual fatigue and glare when viewing screen content, reducing the accuracy and efficiency of information acquisition, but also directly interferes with the driver's vision, making it difficult for the driver to clearly observe road conditions and the surrounding environment while driving, thereby increasing driving safety hazards. To effectively address the specular reflection problem of in-vehicle displays, common technical solutions currently include the following: (1) Cover glass surface treatment: The surface of the cover glass is treated by multi-layer AR coating or advanced 3A film bonding method to control the air side reflectivity of the cover glass to below 0.3%. This level is close to the physical limit, and it is extremely difficult to further reduce it.

[0003] (2)Optically Clear Adhesive (OCA) bonding optimization: The full bonding method is used to replace the frame bonding, which reduces the increase in reflectivity caused by the air interface and improves the optical performance of the display screen.

[0004] (3) Improvement of FOG (Film on Glass) components: By selecting the black matrix (BM) of the color filter (CF), the CF back coating and the TFT (Thin Film Transistor) buffer layer materials, and reasonably adjusting the film thickness, the reflectivity of the FOG components is reduced.

[0005] Through the aforementioned series of technical means, the reflectivity of mainstream automotive display modules on the market has been reduced to below 1.2%. However, as market demands for display quality and driving safety continue to rise, consumers are becoming increasingly demanding in their requirements for the reflectivity of automotive display modules, requiring it to be further reduced to 1.0%, or even expected to be reduced to 0.8%. Existing technologies are insufficient to meet this stringent requirement, necessitating technological optimization and innovation. Summary of the Invention

[0006] The purpose of this invention is to provide an in-vehicle display module that, by coating a black matrix absorption layer, suppresses the reflection of ambient light on the metal electrodes, further reducing the reflectivity of the in-vehicle display module and effectively solving the problem that the reflectivity in the prior art is difficult to meet the stringent requirements of customers.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a vehicle display module, comprising a display panel assembly, an optical bonding layer, and a cover plate assembly stacked sequentially from bottom to top; The cover plate assembly includes a cover plate; The optical bonding layer includes a first optical adhesive layer and a second optical adhesive layer stacked together, and the first optical adhesive layer is bonded to the cover plate. The refractive index of the first optical adhesive layer is greater than the refractive index of the second optical adhesive layer. The display panel assembly includes a TFT array substrate and a CF substrate group disposed opposite to each other, and a liquid crystal layer sandwiched between the TFT array substrate and the CF substrate group. The CF substrate group is bonded to the second optical adhesive layer. A black matrix plating layer is provided on the metal traces of the TFT array substrate to absorb visible light incident from the cover plate assembly side and passing through the CF substrate group and the liquid crystal layer before irradiating the TFT array substrate.

[0008] Furthermore, the refractive index of the first optical adhesive layer matches the refractive index of the cover plate, thereby reducing reflection at the interface between the cover plate assembly and the optical bonding layer; The refractive index of the second optical adhesive layer matches the refractive index of the CF substrate assembly, thereby reducing reflection at the interface between the optical adhesive layer and the CF substrate assembly.

[0009] Furthermore, the optical bonding layer also includes a gradient transition layer disposed between the first optical adhesive layer and the second optical adhesive layer; the refractive index of the gradient transition layer decreases linearly from top to bottom to reduce optical interface reflection caused by the refractive index difference between the first optical adhesive layer and the second optical adhesive layer.

[0010] Furthermore, the thickness of the gradient transition layer is any value between 200μm and 300μm.

[0011] Furthermore, both the first optical adhesive layer and the second optical adhesive layer are made of polymer materials, and the polymer materials are doped with nanoparticles to adjust the refractive index of the first optical adhesive layer and the second optical adhesive layer.

[0012] Furthermore, the polymer material is polyacrylate; The nanoparticles are ZrO2 nanoparticles or SiO2 nanoparticles, and the doping concentration of the nanoparticles is any value between 0.1% and 10%.

[0013] Furthermore, the material of the black matrix coating is a metal oxide, the thickness of the black matrix coating is any value between 1.0 μm and 2.0 μm, and the visible light absorption rate is ≥95%.

[0014] Furthermore, the cover plate assembly also includes an ultra-low reflectance composite layer disposed on the cover plate, wherein the ultra-low reflectance composite layer has an average reflectance of ≤0.3% in the 400nm-700nm wavelength band.

[0015] Furthermore, the total reflectivity of the vehicle-mounted display module is ≤0.8%.

[0016] This application also provides the manufacturing process of the above-mentioned vehicle display module, including the following steps: S1. In the process of TFT array substrate fabrication, after the metal trace etching is completed, black photoresist is coated on the surface of the metal trace. After exposure and development, a black matrix coating is formed above the metal trace. Then, the fabrication of TFT array substrate is completed to obtain TFT array substrate. S2, Prepare the CF substrate assembly; S3. Obtain the liquid crystal layer, and stack the TFT array substrate and the CF substrate group on opposite sides of the liquid crystal layer; S4. Prepare an optical bonding layer and stack the optical bonding layer on the CF substrate assembly; S5. Obtain the cover plate and attach the cover plate to the optical bonding layer to obtain the vehicle display module.

[0017] The beneficial effects of this invention are as follows: The vehicle display module provided in this application, by adding a black matrix coating to the surface of the metal traces on the TFT array substrate, can effectively absorb ambient light entering and penetrating the display panel from the cover plate, preventing it from being reflected on the metal electrodes. Simultaneously, by selecting a double-layer optical adhesive layer and matching it to the refractive indices of the cover plate and the CF substrate group respectively, interface reflections at the interfaces between the optical adhesive layer and the cover plate, and between the optical adhesive layer and the CF substrate group, are eliminated as thoroughly as possible, thereby effectively reducing the total reflectivity of the vehicle display module and significantly improving the visual experience and driving safety of the vehicle display.

[0018] By adding a gradient transition layer between the first and second optical adhesive layers, the reflection between the inner layers of the optical bonding layer is almost negligible, further reducing the reflectivity of the vehicle display module. This effectively solves the problem that the reflectivity in existing technologies cannot meet the stringent requirements of customers, providing a higher quality and safer vehicle display solution for the development of smart cars.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a TFT array substrate according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the vehicle display module shown in Embodiment 1 of the present invention; Figure label: 10. Display panel assembly; 1. TFT array substrate; 11. Glass substrate; 12. Gate electrode; 13. Silicon nitride layer; 14. Amorphous silicon; 15. Source and drain electrodes; 16. Black matrix coating; 17. Planarization layer; 18. Transparent conductive oxide layer; 2. CF substrate assembly; 21. First polarizer; 22. CF substrate; 3. Liquid crystal layer; 4. Optical bonding layer; 41. First optical adhesive layer; 42. Second optical adhesive layer; 43. Gradient transition layer; 5. Cover plate assembly; 51. Cover plate; 52. Ultra-low reflection composite layer; 6. Second polarizer; 7. Backlight unit. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 2 A preferred embodiment of this application shows an in-vehicle display module, including a display panel assembly 10, an optical bonding layer 4, and a cover plate assembly 5 stacked sequentially from bottom to top. The cover plate assembly 5 includes a cover plate 51. The optical bonding layer 4 includes a first optical adhesive layer 41 and a second optical adhesive layer 42 stacked together, and the first optical adhesive layer 41 is bonded to the cover plate 51. The refractive index of the optical bonding layer 4 decreases linearly from top to bottom, meaning the refractive index of the first optical adhesive layer 41 is greater than that of the second optical adhesive layer 42. The display panel assembly 10 includes a TFT array substrate 1, a CF substrate group 2, and a liquid crystal layer 3. The CF substrate group 2 is bonded to the second optical adhesive layer 42, and the CF substrate group 2 is disposed opposite to the TFT array substrate 1. The liquid crystal layer 3 is sandwiched between the TFT array substrate 1 and the CF substrate group 2. Figure 1 As shown, a black matrix plating layer 16 is provided on the metal traces of the TFT array substrate 1 to absorb visible light that is incident from the cover plate assembly 5 side and passes through the CF substrate group 2 and the liquid crystal layer 3 before irradiating onto the TFT array substrate 1.

[0026] In one embodiment, the refractive index of the first optical adhesive layer 41 is matched with the refractive index of the cover plate 51, that is, the refractive index of the first optical adhesive layer 41 is the same as or slightly lower than the refractive index of the cover plate 51, in order to achieve optimal optical matching and eliminate light reflection between the cover plate assembly 5 and the optical bonding layer 4 as much as possible. Preferably, the refractive index of the first optical adhesive layer 41 is the same as the refractive index of the cover plate 51, thereby eliminating reflection at the interface between the cover plate assembly 5 and the optical bonding layer 4 as thoroughly as possible, further improving the light transmittance and display effect of the vehicle display module. Similarly, in this embodiment or some other embodiments, the refractive index of the second optical adhesive layer 42 should be matched with the refractive index of the CF substrate group 2, that is, the refractive index of the second optical adhesive layer 42 is the same as or slightly higher than the refractive index of the CF substrate group 2, in order to optimize the optical interface and eliminate reflection between the optical bonding layer 4 and the CF substrate group 2. Preferably, the refractive index of the second optical adhesive layer 42 is the same as that of the CF substrate assembly 2, so as to eliminate reflection at the interface between the optical bonding layer 4 and the CF substrate assembly 2 as thoroughly as possible, thereby further improving the display performance and anti-reflection effect of the vehicle display module. In some embodiments, the CF substrate assembly 2 includes a CF substrate 22 and a first polarizer 21 stacked on the CF substrate 22. In this case, the first polarizer 21 is bonded to the second optical adhesive layer 42, and the refractive index of the second optical adhesive layer 42 matches the refractive index of the first polarizer 21.

[0027] In one embodiment, the optical bonding layer 4 further includes a gradient transition layer. This gradient transition layer is stacked between the first optical adhesive layer 41 and the second optical adhesive layer 42 to reduce optical interface reflection caused by the refractive index difference between the first optical adhesive layer 41 and the second optical adhesive layer 42, thereby effectively optimizing light transmittance and reducing reflection loss of the display module. In some embodiments, preferably, the refractive index of the optical bonding layer 4 decreases linearly from the first optical adhesive layer 41 to the gradient transition layer and then to the second optical adhesive layer 42. Specifically, the refractive index of the first optical adhesive layer 41 is slightly higher than or equal to the refractive index of the end face of the gradient transition layer that is bonded to the first optical adhesive layer 41. The refractive index of the gradient transition layer decreases linearly from top to bottom until it is slightly higher than the refractive index of the second optical adhesive layer 42 or eventually decreases to the same level as the refractive index of the second optical adhesive layer 42. That is, the refractive index of the end face of the gradient transition layer that is bonded to the second optical adhesive layer 42 is slightly higher than or equal to the refractive index of the second optical adhesive layer 42. This linearly decreasing refractive index design minimizes optical interface reflections, increases light transmittance, and thus enhances the brightness and contrast of the display, optimizing the display effect. In other embodiments, the thickness of the gradient transition layer is controlled within the range of 200μm-300μm to ensure a smooth transition of the refractive index.

[0028] In one embodiment, the first optical adhesive layer 41, the second optical adhesive layer 42, and the gradient transition layer can all be made of a polymer material, and the polymer material is also doped with nanoparticles to adjust the refractive index of the first optical adhesive layer 41, the second optical adhesive layer 42, and the gradient transition layer. In this embodiment or other embodiments, the polymer material can be selected from polyacrylate, epoxy resin, or polyurethane, preferably polyacrylate. The first optical adhesive layer 41, the second optical adhesive layer 42, and the gradient transition layer preferably use the same polymer material to ensure good compatibility and bonding between the layers. The nanoparticles are preferably ZrO2 nanoparticles or SiO2 nanoparticles. ZrO2 nanoparticles are used to increase the refractive index of the polymer material, while SiO2 nanoparticles are used to decrease its refractive index. Furthermore, the doping concentration of the nanoparticles is preferably limited to the range of 0.1%-10%.

[0029] In one embodiment, the black matrix coating 16 is made of a metal oxide with high absorptivity, such as black cobalt oxide, with a visible light absorption rate ≥95%. Furthermore, the black matrix coating 16 is applied only above the metal traces using photolithography, without covering the pixel aperture area, ensuring that the panel aperture ratio is not affected. Its fabrication process can be performed using existing equipment during the fabrication stage of the TFT array substrate 1, eliminating the need to purchase new equipment. In this embodiment or other embodiments, the thickness of the black matrix coating 16 is preferably controlled within the range of 1.0 μm-2.0 μm, and the optical density (OD) ≥4, to effectively absorb ambient light reflection and reduce the total reflectivity of the module. In some embodiments, the display panel assembly 10 further includes a second polarizer 6 integrated on the TFT array substrate 1. The TFT array substrate 1 is integrated on the backlight unit 7 (BLU) via the second polarizer 6.

[0030] In one embodiment, the cover plate assembly 5 further includes an ultra-low reflectance composite layer 52 disposed on the cover plate 51. The ultra-low reflectance composite layer 52 has an average reflectance of ≤0.3% in the 400nm-700nm wavelength band.

[0031] In one embodiment, the total reflectivity of the vehicle display module is ≤0.8%.

[0032] This application also provides the manufacturing process of the above-mentioned vehicle display module, including the following steps: S1. During the fabrication of the TFT array substrate 1, after the metal trace etching is completed, black photoresist is coated on the surface of the metal trace. After exposure and development, a black matrix plating layer 16 is formed above the metal trace. Then, the fabrication of the TFT array substrate 1 is completed to obtain the TFT array substrate 1. S2, Prepare CF substrate group 2; S3. Obtain the liquid crystal layer 3, and stack the TFT array substrate 1 and the CF substrate group 2 on opposite sides of the liquid crystal layer 3. S4. Prepare optical bonding layer 4 and stack optical bonding layer 4 on CF substrate group 2; S5. Obtain the cover plate 51 and attach the cover plate 51 to the optical bonding layer 4 to obtain the vehicle display module.

[0033] Among them, such as Figure 1 As shown, the fabrication process of the TFT array substrate 1 includes: First, a glass substrate 11 is obtained and cleaned using chemical cleaning and deionized water to remove any contaminants, grease, and dust. A gate metal material is deposited on the cleaned glass substrate 11 using evaporation or sputtering processes. Next, a pattern is formed on the gate metal layer using photolithography to create the desired gate shape, and the metal areas not protected by the photoresist are removed by dry or wet etching to form the gate electrode 12. Subsequently, a silicon nitride layer 13 (SiNx layer), an amorphous silicon layer 14 (A-Si layer), and a metal layer are deposited sequentially. Unnecessary metal layer areas are removed using photolithography and etching techniques to form the source and drain electrodes 15 (SD), i.e., metal traces. Then, black photoresist is coated onto the surface of the metal traces, and after exposure and development, a black matrix plating layer 16 is formed above the metal traces. Subsequently, a planarization layer 17 (PLN layer) and a transparent conductive oxide layer 18, such as an ITO layer, are sequentially deposited on the black matrix coating layer 16. The ITO layer is then patterned using photolithography and etching processes to form the required electrode structure, ultimately yielding the TFT array substrate 1. Electrical performance tests are performed on the fabricated TFT array substrate 1 to screen for substrates with good interconnections between layers and display performance meeting design requirements. Example 1

[0034] A vehicle-mounted display module, such as Figure 2 As shown, it includes a display panel assembly 10, an optical bonding layer 4, and a cover plate assembly 5, which are stacked sequentially from bottom to top.

[0035] The cover plate assembly 5 includes a cover plate 51 and an ultra-low reflectance composite layer 52 stacked together. The refractive index N of the cover plate 51 is 1.51, and the average reflectance of the ultra-low reflectance composite layer 52 in the visible light band (400nm-700nm) is ≤0.3%.

[0036] The optical bonding layer 4 includes a first optical adhesive layer 41 and a second optical adhesive layer 42 stacked together. The first optical adhesive layer 41 is bonded to the end face of the cover plate 51 away from the ultra-low reflection composite layer 52. The first optical adhesive layer 41 is made of polyacrylate with a refractive index N1 of 1.51, used to eliminate reflection at the interface between the cover plate 51 and the optical bonding layer 4 as thoroughly as possible. The second optical adhesive layer 42 is made of polyacrylate doped with SiO2 nanoparticles with a refractive index N2 = 1.50.

[0037] The display panel assembly 10 includes a TFT array substrate 1, a CF substrate group 2, a liquid crystal layer 3, and a second polarizer 6 integrated on the TFT array substrate 1. The CF substrate group 2 includes a CF substrate 22 and a first polarizer 21 stacked together. The first polarizer 21 is bonded to a second optical adhesive layer 42, and the refractive index N3 of the first polarizer 21 is 1.50. The TFT array substrate 1 and the CF substrate group 2 are disposed opposite to each other, and the liquid crystal layer 3 is sandwiched between the TFT array substrate 1 and the CF substrate group 2. A black matrix plating layer 16 is disposed on the metal traces of the TFT array substrate 1. The black matrix plating layer 16 has a thickness of 1.5 μm, is made of black cobalt oxide, and has a visible light absorption rate of 96%.

[0038] Because the refractive indices of the first optical adhesive layer 41 and the second optical adhesive layer 42 are very close, they use the same polymer material, and they are tightly bonded together, the interface reflection between these two layers can be ignored. The reflectivity (R0) of this display module is... 总 ):R 总 =R1 (≤ 0.3%) + R2 (0, negligible) + R3 (0, negligible) + R4 (0, negligible) + R5 (≤ 0.5%) ≤ 0.8%; where R1 is the reflectivity of the interface between air and cover plate assembly 5, R2 is the reflectivity of the interface between cover plate assembly 5 and first optical adhesive layer 41, R3 is the reflectivity of the interface between first optical adhesive layer 41 and second optical adhesive layer 42, R4 is the reflectivity of the interface between second optical adhesive layer 42 and display panel assembly 10, and R5 is the reflectivity within display panel assembly 10. Example 2

[0039] The difference between this embodiment and Embodiment 1 is that the optical bonding layer 4 includes a first optical adhesive layer 41, a gradient transition layer, and a second optical adhesive layer 42, all stacked together. The thickness of the gradient transition layer is 250 μm. The refractive index of this optical bonding layer 4 linearly changes from N1 to N2. RA testing showed that this optical bonding layer 4 exhibits no delamination or bubble formation. Compared to the optical bonding layer 4 in Embodiment 1, the interface reflection within the optical bonding layer 4 in this embodiment is significantly lower. Therefore, compared to the reflectivity of the vehicle display module in Embodiment 1, the reflectivity of the vehicle display module in this embodiment is further reduced.

[0040] Therefore, the vehicle display module provided in this application, by employing a refractive index matching design with double-layer optical adhesive layers, can eliminate reflections at the interface between the cover plate assembly 5 and the first optical adhesive layer 41, and at the interface between the second optical adhesive layer 42 and the display panel assembly 10, achieving a zero-reflection interface. Simultaneously, by setting a black matrix plating layer 16 on the metal traces, reflections from the metal electrodes are effectively suppressed, thereby inhibiting metal electrode reflections at the source and optimizing the reflectivity of the display screen from the source, reducing the reflectivity of the vehicle display module to 0.8% or less.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A vehicle-mounted display module, characterized in that, It includes a display panel assembly, an optical bonding layer, and a cover plate assembly stacked sequentially from bottom to top; The cover plate assembly includes a cover plate; The optical bonding layer includes a first optical adhesive layer and a second optical adhesive layer stacked together, and the first optical adhesive layer is bonded to the cover plate. The refractive index of the first optical adhesive layer is greater than the refractive index of the second optical adhesive layer. The display panel assembly includes a TFT array substrate and a CF substrate group disposed opposite to each other, and a liquid crystal layer sandwiched between the TFT array substrate and the CF substrate group. The CF substrate group is bonded to the second optical adhesive layer. A black matrix plating layer is provided on the metal traces of the TFT array substrate to absorb visible light incident from the cover plate assembly side and passing through the CF substrate group and the liquid crystal layer before irradiating the TFT array substrate.

2. The vehicle-mounted display module as described in claim 1, characterized in that, The refractive index of the first optical adhesive layer matches the refractive index of the cover plate, thereby reducing reflection at the interface between the cover plate assembly and the optical bonding layer. The refractive index of the second optical adhesive layer matches the refractive index of the CF substrate assembly, thereby reducing reflection at the interface between the optical adhesive layer and the CF substrate assembly.

3. The vehicle-mounted display module as described in claim 1, characterized in that, The optical bonding layer further includes a gradient transition layer disposed between the first optical adhesive layer and the second optical adhesive layer; the refractive index of the gradient transition layer decreases linearly from top to bottom to reduce optical interface reflection caused by the difference in refractive index between the first optical adhesive layer and the second optical adhesive layer.

4. The vehicle-mounted display module as described in claim 3, characterized in that, The thickness of the gradient transition layer is any value between 200μm and 300μm.

5. The vehicle-mounted display module as described in claim 3, characterized in that, Both the first optical adhesive layer and the second optical adhesive layer are made of polymer materials, and the polymer materials are doped with nanoparticles to adjust the refractive index of the first optical adhesive layer and the second optical adhesive layer.

6. The vehicle-mounted display module as described in claim 5, characterized in that, The polymer material is polyacrylate; The nanoparticles are ZrO2 nanoparticles or SiO2 nanoparticles, and the doping concentration of the nanoparticles is any value between 0.1% and 10%.

7. The vehicle-mounted display module as described in claim 1, characterized in that, The material of the black matrix coating is a metal oxide, the thickness of the black matrix coating is any value between 1.0μm and 2.0μm, and the visible light absorption rate is ≥95%.

8. The vehicle-mounted display module as described in claim 1, characterized in that, The cover plate assembly also includes an ultra-low reflectance composite layer disposed on the cover plate, wherein the ultra-low reflectance composite layer has an average reflectance of ≤0.3% in the 400nm-700nm wavelength band.

9. The vehicle-mounted display module as described in claim 1, characterized in that, The total reflectivity of the vehicle-mounted display module is ≤0.8%.

10. The manufacturing process of the vehicle-mounted display module according to any one of claims 1-9, characterized in that, Includes the following steps: S1. In the process of TFT array substrate fabrication, after the metal trace etching is completed, black photoresist is coated on the surface of the metal trace. After exposure and development, a black matrix coating is formed above the metal trace. Then, the fabrication of TFT array substrate is completed to obtain TFT array substrate. S2, Prepare the CF substrate assembly; S3. Obtain the liquid crystal layer, and stack the TFT array substrate and the CF substrate group on opposite sides of the liquid crystal layer; S4. Prepare an optical bonding layer and stack the optical bonding layer on the CF substrate assembly; S5. Obtain the cover plate and attach the cover plate to the optical bonding layer to obtain the vehicle display module.

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