Direct pasting type vehicle-mounted light-operated film and light-operated display module

Abstract

The invention discloses a direct pasting type vehicle-mounted light control film and a light control display module. The direct pasting type vehicle-mounted light control film sequentially comprises an adhesion layer, a low-folding layer, an atomization layer, a first base material layer, a light control layer and a second base material layer from top to bottom, the refractive index of the adhesion layer is n1, the refractive index of the low-folding layer is n2, and the refractive index of the atomization layer is n3, n1-n2gt; 0.05, n < 3 >-n < 2 > gt; 0, 0.05, n1-n3lt, and n1-n3lt; and 0.03 part. The low-folding layer is introduced between the atomization layer and the adhesion layer, it is ensured that the refractive index of the low-folding layer is obviously lower than that of the adhesion layer and the atomization layer, through the design, light rays are obviously refracted on the interface of the atomization layer and the low-folding layer and the interface of the low-folding layer and the adhesion layer, the light rays are scattered, and therefore the atomization effect is enhanced; and excellent visual shielding performance is provided. In addition, the vehicle-mounted light control film can be directly attached to a display module, the production process is simplified, the manufacturing cost is reduced, and the problem that in a traditional method, the vehicle-mounted light control film is prone to warping and other deformation is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle-mounted light control films, and particularly relates to a direct-attaching vehicle-mounted light control film and a light control display module. Background Art

[0002] With the continuous development of the automotive industry, vehicle-mounted display technology has also been continuously advancing. To enhance the driving experience and safety, vehicle-mounted light control films, as a key component, are widely used in vehicle interior displays and other optical devices. The main function of the vehicle-mounted light control film is to control the passage of light to ensure that the in-vehicle screen can provide a clear and glare-free image under different lighting conditions.

[0003] However, the application of existing vehicle-mounted light control films has certain limitations. Especially in the selection of the installation position, it is usually necessary to place them in a backlight environment, which poses strict requirements on the physical properties of the materials, including but not limited to the warping performance, coefficient of thermal expansion, and shrinkage rate of the materials. Since the light control film is composed of a grating material and a substrate, and there are significant differences in their thermal properties, this makes the light control film prone to deformation problems such as warping and wrinkling during long-term use, especially in high-temperature or large-temperature-change environments. These problems not only affect the functional performance of the light control film but also reduce the user's satisfaction.

[0004] Therefore, there is an urgent need to develop a direct-attaching vehicle-mounted light control film and a light control display module to solve the deficiencies of the existing technology. Summary of the Invention

[0005] The inventors of the present application studied directly bonding the light control film to the module to form an integrated structure, which can effectively disperse external pressure and internal thermal stress, reduce local stress concentration caused by relative movement between different materials, and reduce the interaction force between the grating material and the substrate even under extreme temperature conditions, thereby reducing the risk of deformation. However, this method faces an important challenge: if the atomization layer (usually an embossed or microbead structure) in the light control film directly contacts the adhesive layer, it will cause the adhesive layer to cover the entire atomization layer. At the same time, due to the similar refractive indices of the two, light will not undergo the necessary refraction at the interface between the atomization layer and the adhesive layer, resulting in the atomization layer losing its shielding effect and being unable to achieve the expected optical control function.

[0006] In view of the above problems, the purpose of the present invention is to provide a direct-attaching vehicle-mounted light control film and a light control display module. The vehicle-mounted light control film can be directly attached to the display module, which not only simplifies the production process, reduces the manufacturing cost, but also avoids deformation problems such as warping that are prone to occur in traditional vehicle-mounted light control films. At the same time, the vehicle-mounted light control film can maintain good haze characteristics and provide excellent defect shielding effects.

[0007] To achieve the above object, a first aspect of the present invention provides a direct - sticking vehicle - mounted light - control film, which sequentially includes an adhesion layer, a low - refractive layer, an atomization layer, a first substrate layer, a light - control layer, and a second substrate layer from top to bottom. The refractive index of the adhesion layer is n 1 , the refractive index of the low - refractive layer is n 2 , the refractive index of the atomization layer is n 3 , |n 1 - n 2 |>0.05, |n 3 - n 2 |>0.05, |n 1 - n 3 |<0.03.

[0008] Since the refractive indices of the adhesion layer and the atomization layer are very close, light hardly undergoes significant refraction at the interface between these two layers, resulting in poor atomization effect and thus affecting the shielding performance of the atomization layer. Based on this, the present invention introduces a low - refractive layer between the atomization layer and the adhesion layer and ensures that |n 1 - n 2 |>0.05, |n 3 - n 2 |>0.05, |n 1 - n 3 |<0.03; that is, the refractive index of the low - refractive layer is significantly lower than that of the adhesion layer and the atomization layer. Through this design, light undergoes obvious refraction at the interface between the atomization layer and the low - refractive layer and at the interface between the low - refractive layer and the adhesion layer, and the light is scattered, thereby enhancing the atomization effect and providing excellent visual shielding performance. In addition, the vehicle - mounted light - control film of the present invention can be directly adhered to the display module, which not only simplifies the production process, reduces the manufacturing cost, but also avoids deformation problems such as warping that are prone to occur in the traditional vehicle - mounted light - control film.

[0009] Further, the adhesion layer of the present invention is selected from any one of acrylic glue, PU glue, and epoxy glue. These materials can all provide high - strength adhesion and show good compatibility with various substrates, ensuring a firm adhesion between the light - control film and the display module. Specifically, the refractive index of acrylic glue (acrylate glue) is 1.48 - 1.52; the refractive index of PU glue (polyurethane glue) is 1.50 - 1.55; the refractive index of epoxy glue is 1.50 - 1.60.

[0010] Further, the thickness of the adhesion layer of the present invention is 20 - 100 μm. For example, the thickness of the adhesion layer can be specifically but not limited to 20 μm, 40 μm, 60 μm, 80 μm, 100 μm.

[0011] Furthermore, the haze of the atomization layer of the present invention is 20-60%. The haze value within this range will neither be too low to result in insufficient shielding effect nor be too high to affect the light transmittance. The specific material selection of the atomization layer can be flexibly determined by those skilled in the art according to actual application requirements, as long as the selected material can meet the above haze requirements.

[0012] Furthermore, the refractive index of the low-refractive index layer of the present invention is 1.3-1.4.

[0013] Furthermore, the thickness of the low-refractive index layer of the present invention is 5-50 μm. For example, the thickness of the low-refractive index layer can be, but is not limited to, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm.

[0014] Furthermore, by mass fraction, the low-refractive index layer of the present invention comprises 10-40 parts of porous hollow silica resin, 30-70 parts of silsesquioxane resin, 2-10 parts of dispersant, 1-5 parts of leveling agent, 0.5-3 parts of antioxidant, and 0.1-1 part of initiator. In the prior art, common low-refractive index resins are mainly fluorinated polymers (such as polytetrafluoroethylene and fluoroacrylate, etc.). Due to the low polarizability characteristics of fluorine atoms, such materials can achieve relatively low refractive indices (usually between 1.3 and 1.4), and thus are widely used in the manufacture of low-refractive index coatings. However, with the increasingly strict environmental protection standards, the application of fluorine-containing resins is facing more and more restrictions because their production and use processes may have adverse effects on the environment. Based on this, the present application uses silsesquioxane resin to achieve low-refractive index performance, that is, a hollow silica structure is introduced into the resin system. Its unique hollow morphology significantly reduces the overall density of the resin, thereby ensuring excellent low-refractive characteristics and avoiding environmental problems caused by the use of traditional fluorinated materials.

[0015] Furthermore, the content of the porous hollow silica resin of the present invention can be, but is not limited to, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts; specifically, the porous hollow silica resin is a material with a special structure, its outer shell is silica (SiO 2 )), and the inside is filled with air. The characteristic of this material is that it contains micropores or mesopores on its outer shell, and the pore sizes are in the nanometer scale range, which can significantly increase the specific surface area and adsorption performance of the material; some organic resins can also be pre-adsorbed on the pores to increase the adsorption force. Specifically, the porosity of the porous hollow silica resin is 10-70%.

[0016] Furthermore, the content of the silsesquioxane resin of the present invention can be, but is not limited to, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts; specifically, the specific surface area of the silsesquioxane resin is 400-1500m2 / g.

[0017] Furthermore, the content of the dispersant of the present invention can be, but is not limited to, 2 parts, 4 parts, 6 parts, 8 parts, 9 parts, 10 parts; specifically, the dispersant is at least one of DISPERBYK 102, DISPERBYK 108, DISPERBYK 115, DISPERBYK 118, DISPERBYK 140, DISPERBYK 142, DISPERBYK 145, DISPERBYK 160, DISPERBYK 164, DISPERBYK 170, DISPERBYK 174, DISPERBYK 180, DISPERBYK 184, DISPERBYK 191, DISPERBYK194N, DISPERBYK2001, DISPERBYK2055, DISPERBYK 2150, DISPERBYK 2200, ANTITERRA 250, BYK P104, BYK 220S, BYK 154, BYK 9076 and BYK 9077. The dispersant can further improve the dispersibility of hollow silica.

[0018] Furthermore, the content of the leveling agent of the present invention can be, but is not limited to, 1 part, 2 parts, 3 parts, 4 parts, 5 parts; specifically, the leveling agent is more than one of BYK 300, BYK 301, BYK 302, BYK 331, BYK 335, BYK 306, BYK 330, BYK 341, BYK344, BYK 307, BYK 333 and BYK 310. The leveling agent can further improve the flatness of the low refractive index layer surface.

[0019] Furthermore, the content of the antioxidant of the present invention can be, but is not limited to, 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts; specifically, the antioxidant can be selected from hindered phenol antioxidants and phosphite antioxidants; more specifically, the antioxidant can be, but is not limited to, 2,6-di-tert-butylphenol (BHA), 2,6-di-tert-butyl-4-methylphenol (BHT).

[0020] Furthermore, the content of the initiator of the present invention can be, but is not limited to, 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part; specifically, the initiator is a UV initiator, such as, but not limited to, UV photoinitiator 819.

[0021] Further, the preparation of the low-refractive-index layer of the present invention includes: stirring and mixing porous hollow silica resin, silsesquioxane resin, dispersant, leveling agent, antioxidant, initiator and solvent to obtain a low-refractive-index resin, then coating the low-refractive-index resin on the atomization layer and drying it in an oven to remove the solvent, and then irradiating with UV energy in the range of 800-1500 MJ to obtain the low-refractive-index layer. The solvent can be polar solvents such as alcohols, ketones, glycols, furans, amides, etc., and can also be non-polar or weakly polar solvents such as alkanes, aromatic hydrocarbons, phenols, halogenated hydrocarbons, etc. For example, the alcohol can be ethanol; the ketone can be cyclohexanone; the glycol can be ethylene glycol, propylene glycol; the furan can be tetrahydrofuran; the amide can be dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone; the alkane can be hexane, cyclohexane; the aromatic hydrocarbon can be toluene, xylene; the phenol can be cresol; the halogenated hydrocarbon can be chloroform, dichlorobenzene, etc.

[0022] Further, the first substrate layer and the second substrate layer of the present invention are each independently selected from any one of polyethylene terephthalate (PET), polyurethane (PU), polyvinyl chloride (PVC), polycarbonate (PC), polyimide (PI), and thermoplastic polyurethane (TPU).

[0023] Further, the thicknesses of the first substrate layer and the second substrate layer of the present invention are both 5-300 μm. For example, the thickness of the first substrate layer can be, but is not limited to, 5 μm, 20 μm, 50 μm, 80 μm, 120 μm, 180 μm, 220 μm, 250 μm, 280 μm, 300 μm; for example, the thickness of the second substrate layer can be, but is not limited to, 5 μm, 30 μm, 60 μm, 80 μm, 110 μm, 150 μm, 180 μm, 225 μm, 250 μm, 280 μm, 300 μm.

[0024] Further, the light control layer of the present invention includes alternately arranged light-transmitting units and light-absorbing units with the same height, the distance between the light-transmitting units and the light-absorbing units is 30-60 μm, and the height of the light-transmitting units and the light-absorbing units is 50-200 μm; for example, the distance between the light-transmitting units and the light-absorbing units can be, but is not limited to, 30 μm, 40 μm, 50 μm, 60 μm, and the height of the light-transmitting units can be, but is not limited to, 50 μm, 70 μm, 90 μm, 110 μm, 130 μm, 150 μm, 180 μm, 200 μm.

[0025] Correspondingly, the second aspect of the present invention also provides a light control display module, including a display module, and further including the above-mentioned direct-bonding vehicle-mounted light control film, and the adhesion layer is adhered to the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the light control display module of the present invention.

[0027] Figure 2 Schematic structural diagram of the direct - stick vehicle - mounted light - control film of the present invention.

[0028] Figure 3 For Figure 2 Schematic diagram of the light - path principle after removing the low - refractive layer from the direct - stick vehicle - mounted light - control film in

[0029] Figure 4 For Figure 2 Schematic diagram of the light - path principle of the direct - stick vehicle - mounted light - control film in Detailed implementation mode

[0030] To describe in detail the technical content, structural features, and achieved effects of the present invention, the following will be described in detail in conjunction with the implementation modes and with reference to the drawings.

[0031] Please refer to Figure 1 , the present invention provides a light - control display module 30, which includes a direct - stick vehicle - mounted light - control film 100 and a display module 200. Specifically, directly bonding the direct - stick vehicle - mounted light - control film 100 to the display module 200 can form an integrated structure, which can effectively disperse external pressure and internal thermal stress, reduce local stress concentration caused by relative movement between different materials, and reduce the interaction force between the grating material and the substrate even under extreme temperature conditions, thereby reducing the risk of deformation. Therefore, directly laminating the direct - stick vehicle - mounted light - control film 100 and the display module 200 in the present invention not only simplifies the production process, reduces the manufacturing cost, but also avoids deformation problems such as warping that are prone to occur in the vehicle - mounted light - control film in the traditional method.

[0032] To provide an excellent flaw - masking effect, please refer to Figure 2 , the present invention provides a direct - stick vehicle - mounted light - control film 100, which sequentially includes an adhesion layer 11, a low - refractive layer 12, an atomization layer 13, a first substrate layer 14, a light - control layer 15, and a second substrate layer 16 from top to bottom. A bonding layer 17 for bonding the light - control layer 15 and the second substrate layer 16 is further provided between the light - control layer 15 and the second substrate layer 16. The bonding layer 17 can specifically be an OCA optical adhesive. The light - control layer 15 includes alternately arranged light - transmitting units 151 and light - absorbing units 152 with the same height. The distance between the light - transmitting units 151 and the light - absorbing units 152 is 30 - 60um, and the height of the light - transmitting units 151 and the light - absorbing units 152 is 50 - 200um. Since the refractive indices of the adhesion layer 11 and the atomization layer 13 are very close, light hardly undergoes significant refraction at the interface between these two layers (as shown in Figure 3 ), resulting in poor atomization effect and thus affecting the masking performance of the atomization layer 13. Based on this, the present application introduces a low - refractive layer 12 between the atomization layer 13 and the adhesion layer 11, and ensures that the refractive index n of the adhesion layer 11 1 and the refractive index n of the low - refractive layer 122 The absolute value of the difference is greater than 0.05, and the refractive index n of the atomization layer 13 3 and the refractive index n of the low-refractive index layer 12 2 The absolute value of the difference is greater than 0.05, and the refractive index n of the atomization layer 13 3 and the refractive index n of the adhesion layer 11 1 The absolute value of the difference is less than 0.03; through this design, light undergoes obvious refraction at the interface between the atomization layer 13 and the low-refractive index layer 12 and at the interface between the low-refractive index layer 12 and the adhesion layer 11 (as Figure 4 shown), and the light is scattered, thereby enhancing the atomization effect and providing excellent visual shielding performance.

[0033] The purpose, technical solution, and beneficial effects of the present invention will be described in more detail through specific embodiments below.

[0034] The porous hollow silica resin used in the embodiment was purchased from Changxing Materials Industry Co., Ltd. The silsesquioxane resin used in the embodiment is dodecaphenyl-cage-shaped polyhedral oligomeric silsesquioxane (Dodecaphenyl POSS) as shown below, and it was purchased from Changxing Materials Industry Co., Ltd.;

[0035]

[0036] Example 1

[0037] This embodiment provides a direct-sticking vehicle light control film, which sequentially includes an adhesion layer, a low-refractive index layer, an atomization layer, a first substrate layer, a light control layer, a bonding layer, and a second substrate layer from top to bottom,

[0038] wherein, the thickness of the adhesion layer is 30 μm, which is composed of PU glue and has a refractive index of 1.53;

[0039] The thickness of the low-refractive index layer is 10 μm, and its refractive index is 1.42; the formula of the low-refractive index layer is shown in Table 1;

[0040] The atomization layer is composed of acrylic material; it has a haze of 20% and a refractive index of 1.52;

[0041] The thickness of the first substrate layer is 100 μm, which is composed of PET;

[0042] The light control layer includes alternately arranged light-transmitting units and light-absorbing units with the same height. The distance between the light-transmitting units and the light-absorbing units is 40 μm, and the height of the light-transmitting units and the light-absorbing units is 100 μm;

[0043] The bonding layer is OCA optical glue;

[0044] The thickness of the second substrate layer is 200 μm, which is composed of PET.

[0045] Examples 2 to 9 of the direct - stick vehicle - mounted light - control film are basically the same as Example 1, with the only differences being: the formulation and refractive index of the low - refractive layer, and the haze of the atomization layer; the formulation of the low - refractive layer in Examples 2 to 9 is shown in Table 1, and the refractive index of the low - refractive layer and the haze of the atomization layer in Examples 2 to 9 are shown in Table 2.

[0046] Comparative Example 1

[0047] This comparative example provides a direct - stick vehicle - mounted light - control film, which sequentially includes an adhesion layer, an atomization layer, a first substrate layer, a light - control layer, a bonding layer, and a second substrate layer from top to bottom.

[0048] Among them, the thickness of the adhesion layer is 30μm, which is composed of PU glue and has a refractive index of 1.53.

[0049] The atomization layer is composed of acrylic material, has a haze of 20%, and has a refractive index of 1.52.

[0050] The thickness of the first substrate layer is 100μm, which is composed of PET.

[0051] The light - control layer includes alternately arranged light - transmitting units and light - absorbing units with the same height. The distance between the light - transmitting units and the light - absorbing units is 40um, and the height of the light - transmitting units and the light - absorbing units is 100um.

[0052] The bonding layer is OCA optical glue; the thickness of the second substrate layer is 200μm, which is composed of PET.

[0053] The haze values of the direct - stick vehicle - mounted light - control films of Examples 1 to 9 and Comparative Example 1 were measured using a haze meter, and the results are shown in Table 2.

[0054] Table 1

[0055]

[0056] Table 2

[0057]

[0058]

[0059] According to the results shown in Table 2, it can be observed that by introducing a low - refractive layer between the atomization layer and the adhesion layer and ensuring that the refractive index of the low - refractive layer is significantly lower than that of the adhesion layer and the atomization layer, the direct - stick vehicle - mounted light - control film of the present invention can still effectively maintain the original haze of the light - control film. This means that even after the direct - stick vehicle - mounted light - control film is bonded to the display module, the direct - stick vehicle - mounted light - control film can still ensure high transparency and less light scattering, which is very beneficial for ensuring that users obtain good visual effects.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it is not limited to the embodiments listed. Those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A direct-attach vehicle-mounted light control film, characterized in that: From top to bottom, it includes an adhesion layer, a low-fold layer, a mist layer, a first substrate layer, a light control layer, and a second substrate layer. The refractive index of the adhesion layer is n1, the refractive index of the low-fold layer is n2, and the refractive index of the mist layer is n3. |n1-n2|>0.05, |n3-n2|>0.05, and |n1-n3|<0.

03.

2. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The adhesive layer is selected from any one of acrylic glue, PU glue and epoxy glue.

3. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The haze of the atomized layer is 20-60%.

4. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The refractive index of the low-fold layer is 1.3-1.

4.

5. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The thickness of the low fold layer is 5-50 μm.

6. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The low-fold layer comprises, by weight, 10 to 40 parts of porous hollow silica resin, 30 to 70 parts of silsesquioxane resin, 2 to 10 parts of dispersant, 1 to 5 parts of leveling agent, 0.5 to 3 parts of antioxidant, and 0.1 to 1 part of initiator.

7. The direct-attach vehicle-mounted light control film according to claim 6, characterized in that: The porosity of the porous hollow silica resin is 10-70%; the specific surface area of ​​the silsesquioxane resin is 400-1500m 2 / g.

8. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The first substrate layer and the second substrate layer are each independently selected from any one of PET, PU, ​​PVC, PC, PI, and TPU.

9. The direct-attach vehicle-mounted light control film according to claim 1, characterized in that: The light control layer comprises light-transmitting units and light-absorbing units which are alternately arranged and have the same height, the spacing between the light-transmitting units and the light-absorbing units is 30-60 μm, and the height of the light-transmitting units and the light-absorbing units is 50-200 μm.

10. A light-controlled display module, comprising a display module, characterized in that: It also includes the direct-attachable vehicle-mounted light control film as described in any one of claims 1 to 9, wherein the adhesive layer is attached to the display module.

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