Multifunctional dimming film

Abstract

The utility model provides a multifunctional light adjusting film, and belongs to the technical field of light adjusting films. The multifunctional light adjusting film comprises a first functional layer, a functional light adjusting layer and a second functional layer which are sequentially arranged in a stacked mode. The first functional layer comprises an ultraviolet blocking layer, a first transparent base material layer and a first transparent conducting layer which are sequentially stacked; the first functional layer comprises a second transparent conductive layer, a second transparent base material layer and a transparent projection layer which are stacked in sequence; and the functional dimming layer is positioned between the first transparent conductive layer and the second transparent conductive layer. According to the multifunctional light adjusting film, the structure of the multifunctional light adjusting film is designed, multiple functions are integrated into the same light adjusting film, and the multifunctional light adjusting film which is simple in structure and high in production yield is obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of dimming films, and particularly relates to a multifunctional dimming film. Background Art

[0002] With the requirements of green energy conservation in the construction industry and the popularity of sunroof glass in the automotive field, how to achieve intelligence and energy conservation has become a widely concerned issue. Although Low-E glass and roller blinds can reduce the sunlight irradiation on the internal space, Low-E glass has a strong light reflection effect and serious light pollution problems; roller blinds are a common heat insulation unit for building facades, but their application is limited in vehicles. Currently, with the popularization of new energy vehicles, dimming products have gradually come into people's view. By rotating a knob, the light transmittance can be adjusted, and on the basis of achieving heat insulation, the light transmittance can be adjusted according to personal preferences. Currently, commonly used technologies such as PDLC, EC, SPD, and LC technologies can all achieve this function.

[0003] As an important human-computer interaction and information display technology means in the near future and for some time to come, transparent display is also widely used in the fields of architecture and vehicles. CN115704990A proposes a concept of combining a dimming product with a transparent display product, and the contrast is improved by adjusting the light to meet the viewing of the picture under different light conditions. CN209746346U proposes a secondary imaging scheme, and the function of improving the projection contrast is realized by the combination of a holographic film and a PDLC film. Both of these two schemes belong to the combination of a projection film and a dimming product, but they both involve the matching of multiple film materials and the process is complex.

[0004] Problems caused by ultraviolet aging exist in dimming products, and the aging resistance performance can be achieved through the improvement of the laminated process materials. How to unify multiple functions into one product, improve efficiency while enhancing its functionality, and achieve the effect of reducing costs and increasing efficiency, that is, how to provide a multifunctional dimming film with a simple structure and a high production yield has become an urgent technical problem to be solved at present. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a multifunctional dimming film. By designing the structure of the multifunctional dimming film, multiple functions are unified into the same dimming film, and a multifunctional dimming film with a simple structure and a high production yield is obtained.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a multifunctional dimming film, which comprises a first functional layer, a functional dimming layer, and a second functional layer that are sequentially stacked.

[0008] The first functional layer includes an ultraviolet barrier layer, a first transparent substrate layer, and a first transparent conductive layer that are sequentially stacked;

[0009] The second functional layer includes a second transparent conductive layer, a second transparent substrate layer, and a transparent projection layer that are sequentially stacked;

[0010] The functional dimming layer is located between the first transparent conductive layer and the second transparent conductive layer.

[0011] The multi-functional dimming film provided by the present utility model includes an ultraviolet barrier layer, a first transparent substrate layer, a first transparent conductive layer, a functional dimming layer, a second transparent conductive layer, a second transparent substrate layer, and a transparent projection layer that are sequentially stacked.

[0012] By designing the structure of the multi-functional dimming film, the present utility model unifies multiple functions (the first functional layer provides the performance of UV blocking, the functional dimming layer provides the function of adjusting the visible light transmittance, and the second functional layer provides the function of transparent projection) into the same dimming film, obtaining a multi-functional dimming film with a simple structure and a relatively high production yield.

[0013] In the present utility model, the ultraviolet barrier layer can block the structural damage of ultraviolet rays to the polymer substrate, and at the same time can block sunlight and reduce the sunlight transmittance; the functional dimming layer can achieve multi-range adjustment (segmented step adjustment); the transparent projection layer can achieve projection imaging, and at the same time can control external light through the functional dimming layer to improve the projection contrast.

[0014] In the present utility model, by providing a second transparent conductive layer on one side of the second transparent substrate layer and a transparent projection layer on the other side, the structure of the multi-functional dimming film is simplified, and the overall thickness of the multi-functional dimming film is reduced.

[0015] The following are the preferred technical solutions of the present utility model, but do not limit the technical solutions provided by the present utility model. Through the following preferred technical solutions, the objectives and beneficial effects of the present utility model can be better achieved.

[0016] As a preferred technical solution of the present utility model, the light transmittance of the functional dimming layer is 0.5% to 80%, and for example, it can be 0.5%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or 80%, etc.

[0017] In the present utility model, there is no special limitation on the composition of the functional dimming layer, and any functional dimming layer that can meet the light transmittance requirements is applicable, including but not limited to, for example: PDLC, EC, SPD, or dye liquid crystal, etc. Functional dimming layers with different light transmittances can be selected according to requirements.

[0018] It should be noted that the functional dimming layer includes a sealing frame structure surrounding the dimming material. The sealing frame structure can be formed by polymerization and curing of a reactive adhesive, including but not limited to thermosetting epoxy resin glue, photocurable acrylate glue, and UV heating hybrid glue, etc.

[0019] The functional dimming layer further includes a support structure located between the first transparent substrate and the second transparent substrate. The support structure can be distributed anywhere between the first transparent substrate and the second transparent substrate, including within the sealing frame structure; the support structure is a columnar support mechanism or spacer balls. Among them, the material of the support structure is at least one of resin, glass fiber, and inorganic materials, including but not limited to polystyrene, silicon dioxide, etc.; the shape of the support structure can be spherical, rod-shaped, or other shapes. The size of the support structure is determined according to the thickness of the dimming layer. The present utility model is not limited thereto, and the support structure can also be replaced by other structures, which will not be elaborated here.

[0020] At the same time, it should be noted that the present utility model has no special limitation on the thickness of the functional dimming layer, and any thickness range commonly used in the art is applicable.

[0021] As a preferred technical solution of the present utility model, the ultraviolet barrier rate of the ultraviolet barrier layer is ≥99%, for example, it can be 99%, 99.1%, 99.2%, 99.3%, 99.4%, 99.5%, 99.6%, or 99.7%, etc.

[0022] The present utility model has no special limitation on the thickness of the ultraviolet barrier layer, and any thickness range commonly used in the art is applicable.

[0023] As a preferred technical solution of the present utility model, the first transparent substrate layer is selected from any one of a PET layer, a PC layer, a PVC layer, or a glass layer.

[0024] It should be noted that the present utility model has no special requirements for the performance such as the light transmittance of the first transparent substrate layer, and any substrate commonly used in the art for preparing a dimming film is applicable. Theoretically, the larger the light transmittance of the first transparent substrate layer, the better. The first transparent substrate layer has less light blocking, and the light control is placed in the dimming layer during dimming and in the reflective layer of the transparent projection layer.

[0025] As a preferred technical solution of the present utility model, the first transparent conductive layer is selected from any one of an ITO layer, a carbon-based conductive thin film layer, a metal nanowire conductive thin film layer, and a metal oxide thin film layer.

[0026] It should be noted that the carbon-based conductive thin film includes a graphene oxide conductive thin film and a carbon nanotube conductive thin film; the metal nanowires in the metal nanowire conductive thin film include silver nanowires and / or copper nanowires; the metal oxides in the metal oxide thin film include, but are not limited to, any one or a combination of at least two of indium tin oxide, indium oxide, tin oxide, or zinc oxide.

[0027] In the present utility model, there is no specific limitation on the thickness of the first transparent substrate layer and the first transparent conductive layer, and the thickness ranges commonly used in the art are applicable.

[0028] As a preferred technical solution of the present utility model, the transparent projection layer includes a microstructure layer, a reflective layer, and a refractive index matching layer that are sequentially stacked;

[0029] The microstructure layer is located between the second transparent substrate layer and the reflective layer.

[0030] As a preferred technical solution of the present utility model, the microstructures in the microstructure layer are selected from any one or a combination of at least two of a random curved surface structure, a prism structure, or a Fresnel structure.

[0031] As a preferred technical solution of the present utility model, the reflective layer is a metal reflective layer.

[0032] As a preferred technical solution of the present utility model, the refractive index matching layer is prepared from an optical resin.

[0033] It should be noted that there is no special limitation on the specific selection of the optical resin in the present utility model, and the optical resins commonly used in the art are applicable. Exemplarily, they include, but are not limited to, acrylic resin, polyurethane resin, and silicone resin; among them, acrylic resin is the general term for polymers of acrylic acid, methacrylic acid, and their derivatives; polyurethane resin (polyurethane) is a polymer composed of polyols and isocyanates.

[0034] It should be noted that there is no special limitation on the thickness of the microstructure layer, the reflective layer, and the refractive index matching layer in the present utility model, and the thickness ranges commonly used in the art are applicable. At the same time, there is no special limitation on the refractive index of the microstructure layer and the refractive index matching layer in the present utility model, as long as the refractive indices of the microstructure layer and the refractive index matching layer are similar. Exemplarily, the refractive indices of the microstructure layer and the refractive index matching layer include, but are not limited to, a refractive index of 1.4 to 1.5.

[0035] As a preferred technical solution of the present utility model, the second transparent substrate layer is selected from any one of a PET layer, a PC layer, a PVC layer or a glass layer.

[0036] As a preferred technical solution of the present utility model, the second transparent conductive layer is selected from any one of an ITO layer, a carbon-based conductive thin film layer, a metal nanowire conductive thin film layer, and a metal oxide thin film layer.

[0037] For the specific types and specific compositions of the carbon-based conductive thin film layer, the metal nanowire conductive thin film layer, and the metal oxide thin film layer, they are the same as described above. The carbon-based conductive thin film includes a graphene oxide conductive thin film and a carbon nanotube conductive thin film; the metal nanowires in the metal nanowire conductive thin film include silver nanowires and / or copper nanowires; the metal oxides in the metal oxide thin film include, but are not limited to, any one or a combination of at least two of indium tin oxide, indium oxide, tin oxide, or zinc oxide.

[0038] In the present utility model, there is no specific limitation on the thickness of the second transparent substrate layer and the second transparent conductive layer, and the commonly used thickness ranges in the art are applicable.

[0039] The present utility model provides a method for preparing the above-mentioned multifunctional dimming film. The preparation method includes the following steps:

[0040] (1) Provide an ultraviolet barrier layer on one side of the first transparent substrate layer;

[0041] Provide a first transparent conductive layer on the other side of the first transparent substrate layer to obtain a first functional layer;

[0042] (2) Protect one side of the second transparent substrate layer, and provide a micro-structure layer on the unprotected side of the second transparent substrate layer;

[0043] Provide a reflective layer on the side of the micro-structure layer away from the second transparent substrate layer;

[0044] Provide a refractive index matching layer on the side of the reflective layer away from the second transparent substrate layer, and form a transparent projection layer on one side of the second transparent substrate layer;

[0045] After removing the protection on one side of the second transparent substrate layer, provide a second transparent conductive layer to obtain a second functional layer;

[0046] (3) Prepare a functional dimming layer;

[0047] (4) Compound the first functional layer, the functional dimming layer and the second functional layer to obtain the multifunctional dimming film.

[0048] Compared with the method of first making a dimming device (including a first transparent substrate layer, a first transparent conductive layer, a dimming functional layer, a second transparent conductive layer, and a second transparent substrate layer arranged in layers in sequence), and then respectively arranging an ultraviolet barrier layer and a transparent projection layer on both sides of the dimming device (the ultraviolet barrier layer is arranged on the side of the first transparent substrate layer away from the dimming layer, and the transparent projection layer is arranged on the side of the second transparent substrate layer away from the dimming layer); the preparation method provided by the present invention can avoid damaging the already made functional dimming layer when processing the transparent projection layer. The production of the transparent projection layer is sometimes accompanied by a lamination action. For example, when making a microstructured layer, one technical route adopts an imprinting method. Therefore, if a transparent projection layer is arranged on the second transparent substrate layer provided with a dimming functional layer, during the process of arranging the transparent projection layer, the lamination process will damage the dimming function. Therefore, the present invention first prepares a first functional layer and a second functional layer, and finally composites the first functional layer, the functional dimming layer, and the second functional layer, thus avoiding the damage to the already made functional dimming layer when processing the transparent projection layer and improving the yield of the multifunctional dimming film. As a preferred technical solution of the present invention, the method for arranging the ultraviolet barrier layer in step (1) includes: coating or plating.

[0049] Preferably, the method for arranging the first transparent conductive layer in step (1) includes coating or plating.

[0050] It should be noted that plating refers to plating a metal or a metal oxide using a coating process, and the coating method is mainly vacuum evaporation plating or magnetron sputtering coating, the same hereinafter.

[0051] As a preferred technical solution of the present invention, the method for protecting the second transparent substrate layer in step (2) includes: protecting it with a protective film.

[0052] Preferably, the protective film includes a PE protective film (polyethylene protective film).

[0053] In the present invention, the PE protective film is arranged on one surface of the second transparent conductive layer of the second functional layer, and is used to protect the other surface of the second transparent conductive layer during the process of making a microstructured layer, a reflective layer, and a refractive index matching layer on the side of the second transparent substrate layer away from the second transparent conductive layer, so as to prevent it from being scratched.

[0054] As a preferred technical solution of the present invention, the method for arranging the microstructured layer in step (2) includes: using a microstructured template to arrange the microstructures on the unprotected side of the second transparent substrate layer;

[0055] Or, directly arranging a microstructured layer on the unprotected side of the second transparent substrate layer;

[0056] Preferably, the preparation method of the microstructured template includes: shot peening, mechanical engraving, etching, chemical etching methods.

[0057] Preferably, the method of disposing the microstructures on one side of the second transparent substrate layer includes: coating and transfer printing, and obtaining a microstructure layer through any one of heat curing, UV curing or EB curing.

[0058] Preferably, the method of directly disposing the microstructure layer is selected from any one or a combination of at least two of mechanical engraving, etching or chemical corrosion.

[0059] In the present utility model, on the unprotected side of the second transparent substrate layer, the microstructures are disposed on the other side of the second transparent substrate layer by using a microstructure template. The specific process method for obtaining the disposed microstructure layer can refer to the method described in CN106959479A.

[0060] Preferably, the method of disposing the reflective layer in step (2) includes evaporation coating and magnetron sputtering; the metal includes any one or a combination of at least two of gold, silver or aluminum.

[0061] Preferably, the method of disposing the refractive index matching layer in step (2) includes: wet coating process or dry lamination process.

[0062] Preferably, the method of disposing the refractive index matching layer in step (2) includes any one of offset printing, transfer printing, extrusion, slitting, coating or lamination.

[0063] Preferably, the method of disposing the second transparent conductive layer in step (2) includes coating or plating.

[0064] As a preferred technical solution of the present utility model, the method of lamination in step (4) includes laminating.

[0065] For the functional dimming layer being a solid structure or a semi-solid structure, the lamination in step (4) can be laminating.

[0066] For the functional dimming layer being a liquid or other structure with fluidity, the lamination in step (4) can be to fix the first functional layer and the second functional layer together by means of a frame adhesive around the functional dimming layer, and make the functional dimming layer disposed in the cavity formed by the first functional layer, the second functional layer and the frame adhesive.

[0067] The present utility model provides an application of a multifunctional dimming film, and the multifunctional dimming film is used for manufacturing an automobile or a display screen.

[0068] Preferably, the display screen includes a display screen for a museum, a display screen for exhibition in an exhibition hall or a display screen for commercial advertisement placement.

[0069] Compared with the prior art, the present utility model has the following beneficial effects:

[0070] The present utility model designs the structure of a multifunctional dimming film, and through a specific preparation method, unifies multiple functions into the same dimming film, obtaining a multifunctional dimming film with a simple structure and a relatively high production yield. Description of the Drawings

[0071] Figure 1 is a schematic structural diagram of the multifunctional dimming film provided in Embodiment 1 of the present utility model;

[0072] Figure 2 is a schematic structural diagram of the transparent projection layer of the multifunctional dimming film provided in Embodiment 1 of the present utility model;

[0073] Figure 3 is a projection schematic diagram when the multifunctional dimming film is in a transparent state when the multifunctional dimming film provided in Embodiment 1 of the present utility model is used in combination with a projector;

[0074] Figure 4 is a projection schematic diagram after adjusting the light transmittance of the multifunctional dimming film when the multifunctional dimming film provided in Embodiment 1 of the present utility model is used in combination with a projector;

[0075] Wherein, 1 - first functional layer, 11 - ultraviolet blocking layer, 12 - first transparent substrate layer, 13 - first transparent conductive layer, 2 - functional dimming layer, 3 - second functional layer, 31 - second transparent conductive layer, 32 - second transparent substrate layer, 33 - transparent projection layer, 331 - microstructural layer, 332 - reflective layer, 333 - refractive index matching layer;

[0076] A - projector. Detailed Embodiments

[0077] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present utility model and should not be regarded as specific limitations to the present utility model.

[0078] Embodiment 1

[0079] This embodiment provides a multifunctional dimming film, which has three functions. The schematic structural diagram of the multifunctional dimming film is as Figure 1 shown, including a first functional layer 1, a functional dimming layer 2, and a second functional layer 3 that are sequentially stacked;

[0080] The first functional layer 1 includes an ultraviolet blocking layer 11, a first transparent substrate layer 12, and a first transparent conductive layer 13 that are sequentially stacked;

[0081] The second functional layer 3 includes a second transparent conductive layer 31, a second transparent substrate layer 32, and a transparent projection layer 33 that are sequentially stacked;

[0082] The functional dimming layer 2 is located between the first transparent conductive layer 13 and the second transparent conductive layer 31.

[0083] Among them, the preparation raw material of the ultraviolet blocking layer 11 is polyvinyl butyral, its ultraviolet blocking rate is ≥99%, and the thickness is 0.38 μm;

[0084] The first transparent substrate layer 12 is a PET film, its light transmittance is 98%, and the thickness is 50 μm;

[0085] The first transparent conductive layer 13 is an ITO layer, and its thickness is 10 μm;

[0086] The functional dimming layer 2 is PDLC, and the thickness of the functional dimming layer 2 is 15 μm;

[0087] The second transparent conductive layer 31 is an ITO layer, and its thickness is 10 μm;

[0088] The second transparent substrate layer 32 is a PET film, its light transmittance is 98%, and the thickness is 50 μm;

[0089] The structural schematic diagram of the transparent projection layer 33 is as Figure 2 shown, including a microstructure layer 331, a reflection layer 332 and a refractive index matching layer 333 which are sequentially stacked, and one side of the microstructure layer 331 away from the reflection layer 332 is attached to the second transparent substrate layer 32;

[0090] Among them, the microstructure in the microstructure layer 331 is a prism structure, the refractive index is 1.45, and the thickness is 25 μm;

[0091] The material of the reflection layer 332 is aluminum, and the thickness is 10 μm;

[0092] The refractive index matching layer 333 is prepared from acrylic resin, the refractive index is 1.45, and the thickness is 1.45 μm.

[0093] The preparation method of the above multifunctional dimming film includes the following steps:

[0094] (1) Set an ultraviolet blocking layer on one side of the first transparent substrate layer (PET film);

[0095] Vacuum deposit ITO on the other side of the first transparent substrate layer to form the first transparent conductive layer, and obtain the first functional layer;

[0096] (2) Attach a PE protective film to one side of the second transparent substrate layer (PET film), and etch the unprotected side of the second transparent substrate layer to form a microstructure layer;

[0097] On the side of the micro-structure layer away from the second transparent substrate layer, aluminum metal is evaporated to form a reflective layer;

[0098] On the side of the reflective layer away from the second transparent substrate layer, an acrylic resin is coated to form a refractive index matching layer, and then a transparent projection layer is formed on one side of the second transparent substrate layer;

[0099] After removing the PE protective film, ITO is vacuum-evaporated on the side of the second transparent substrate layer away from the transparent projection layer to form a second transparent conductive layer, obtaining a second functional layer;

[0100] (3) Prepare a functional dimming layer;

[0101] (4) Composite the first functional layer, the functional dimming layer and the second functional layer to obtain the multifunctional dimming film.

[0102] Application Example 1

[0103] The multifunctional dimming film provided in Example 1 is paired with a projector to achieve an imaging function. The specific system is as Figure 4 . As we can see from the figure, when the dimming device is in the transparent state (as Figure 3 shown), we can see the projection screen on the multifunctional dimming film. At the same time, through the dimming film, we can see the real scene behind. When the external light becomes stronger and the contrast of the picture decreases, by adjusting the light transmittance of the dimming film, we can reduce the interference of outdoor light on the picture quality and improve the picture contrast (as Figure 4 shown). Here, for the appearance shape of the multifunctional dimming film, it can be a planar structure, a curved structure, a single-curved surface, or a double-curved surface; there is no special specification for the type of projector, and it can be any one of the current conventional projectors; at the same time, in order to improve the interactivity of human-computer interaction, an induction function (such as a touch film, infrared induction, etc.) can be added on the basis of the current multifunctional dimming film.

[0104] As can be seen from the above, in the present invention, through the design of the structure of the multifunctional dimming film and by a specific preparation method, multiple functions are unified into the same dimming film, obtaining a multifunctional dimming film with a simple structure, a small thickness, and a high production yield.

[0105] The applicant declares that the detailed structural features and detailed technological processes of the present utility model are illustrated by the above embodiments, but the present utility model is not limited to the above detailed structural features and detailed technological processes, that is, it does not mean that the present utility model must rely on the above detailed structural features and detailed technological processes to be implemented. Those skilled in the art should understand that any improvement to the present utility model, the equivalent replacement of the components selected for the present utility model, the addition of auxiliary components, the selection of specific methods, etc., the equivalent replacement of the raw materials of the present utility model products, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present utility model.

Claims

1. A multifunctional dimming film, characterized in that, The multifunctional dimming film includes a first functional layer, a functional dimming layer, and a second functional layer that are sequentially stacked; The first functional layer includes an ultraviolet barrier layer, a first transparent substrate layer, and a first transparent conductive layer that are sequentially stacked; The second functional layer includes a second transparent conductive layer, a second transparent substrate layer, and a transparent projection layer that are sequentially stacked; The functional dimming layer is located between the first transparent conductive layer and the second transparent conductive layer.

2. The multifunctional dimming film according to claim 1, characterized in that, The light transmittance of the functional dimming layer is 0.5% to 80%.

3. The multifunctional dimming film according to claim 1, wherein The ultraviolet light barrier rate of the ultraviolet barrier layer is ≥99%.

4. The multifunctional dimming film according to claim 1, wherein The first transparent substrate layer is selected from any one of a PET layer, a PC layer, a PVC layer, or a glass layer.

5. The multifunctional light-dimming film according to claim 1, characterized in that, The first transparent conductive layer is selected from any one of an ITO layer, a carbon-based conductive thin film layer, a metal nanowire conductive thin film layer, or a metal oxide thin film layer.

6. The multifunctional dimming film according to claim 1, characterized in that, The transparent projection layer includes a microstructure layer, a reflective layer, and a refractive index matching layer that are sequentially stacked; The microstructure layer is located between the second transparent substrate layer and the reflective layer.

7. The multifunctional dimming film according to claim 6, characterized in that The microstructures in the microstructure layer are selected from any one or a combination of at least two of a random curved surface structure, a prism structure, or a Fresnel structure.

8. The multifunctional dimming film according to claim 6, wherein The reflective layer is a metal reflective layer.

9. The multifunctional dimming film according to claim 1, wherein, The second transparent substrate layer is selected from any one of a PET layer, a PC layer, a PVC layer, or a glass layer.

10. The multifunctional dimming film according to claim 1, characterized in that, The second transparent conductive layer is selected from any one of an ITO layer, a carbon-based conductive thin film layer, a metal nanowire conductive thin film layer, or a metal oxide thin film layer.

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