Preparation method of light control film and product thereof

Abstract

The invention discloses a preparation method of a light control film and a product thereof, and relates to the technical field of light control film preparation. The preparation method of the light control film comprises the following steps: S101, preparing a first mold of a light control structure according to a preset requirement; s102, the processed base material and the first mold are subjected to impressing curing, and a structure with light-transmitting areas and light-absorbing areas spaced is formed; s103, filling and curing a light absorption material in the light absorption area; s104, removing the surface absorbing material; and S105, coating an adhesive on the surface close to one side of the light incident surface and positioned in the light transmitting area to form a semi-finished product of the light-operated structural film. According to the invention, the problem that the transmittance of the conventional light control film is affected due to the fact that glue remains on the surface of a light-transmitting area when the absorption area is filled with the glue due to a process method is solved; and meanwhile, the light control film inevitably needs to alternately appear a light transmission area and a light absorption area, so that the light on the light input surface is inevitably absorbed by the light absorption area, and the problem that the brightness is lost is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of light control film preparation, and in particular to a light control film preparation method and a product thereof. Background Art

[0002] The main process of the light control film preparation scheme currently on the market includes the following steps: 1. Mold processing; 2. Imprinting and curing of the light-transmitting area structure; 3. Glue filling and curing of the absorption area; its process method causes the glue filling in the absorption area to remain on the surface of the light-transmitting area, thus affecting its transmittance; at the same time, the light control film inevitably needs to alternate between the light-transmitting area and the light-absorbing area, so the light on the light input surface will inevitably be absorbed by the absorption area, thereby losing brightness; and the high-transmittance filter light control film market, due to its complex manufacturing process cost, low yield, and difficulty in mass production, the cost remains high. No effective solution has been proposed for the above-mentioned problems. Summary of the invention

[0003] Purpose of the invention: To provide a method for preparing a light control film and a product thereof, so as to solve at least one of the problems existing in the above-mentioned prior art.

[0004] Technical solution: A method for preparing a light control film, comprising the following steps:

[0005] S101, preparing a first mold of a light control structure according to preset requirements;

[0006] S102, imprinting and curing the treated substrate and the first mold to form a structure in which a light-transmitting area and a light-absorbing area are spaced apart;

[0007] S103, filling and curing the light absorbing material in the light absorbing area;

[0008] S104, removing surface absorbing materials;

[0009] S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film;

[0010] S106, preparing a second mold of a reflective structure according to preset requirements;

[0011] S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer;

[0012] S108, aligning and bonding the reflective structure layer and the light absorbing area of ​​the semi-finished light control structure film, and curing them, to finally form a light control film with high transmittance.

[0013] Preferably, S103, filling and curing the light absorbing material in the light absorbing area, comprises:

[0014] The mixed light absorbing material is filled in the light absorbing area and UV cured, and due to the volatilization of the solvent, a partial cavity is formed on the surface of the light absorbing area; wherein the light absorbing material includes: acrylic adhesive, polyurethane and volatile solvent.

[0015] Preferably, S104, removing the surface absorbing material, comprises:

[0016] When the product is cured, the top film is removed and any absorbing material remaining covering the light-transmitting area is removed.

[0017] Preferably, S104, removing the surface absorbing material, further comprises:

[0018] The surface adsorbed materials are removed by thin film adhesion removal, solvent dissolution removal, laser destruction removal or ion reaction removal.

[0019] Preferably, S105, coating an adhesive on the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, including:

[0020] The optical refractive index of the adhesive is n5, the optical refractive index of the light-transmitting area is n1, and the optical refractive index of the reflective structure layer is n4, and the following relationship is satisfied: n5≤n4, and n5≤n1 is satisfied at the same time.

[0021] Preferably, S105, coating an adhesive on the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further comprising:

[0022] The adhesive includes: one or more of acrylic adhesive, polyurethane adhesive, and epoxy adhesive.

[0023] Preferably, S105, coating an adhesive on the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further comprising:

[0024] The coating thickness of the adhesive is between 1 μm and 10 μm.

[0025] Preferably, S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, comprising:

[0026] The size of the reflective structure layer is 0.5-100 μm, and the width of the reflective structure layer is not greater than the width of the light absorption area.

[0027] Preferably, S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, further comprising:

[0028] The reflective structure layer is in the shape of a triangular prism, a quadrangular pyramid, a triangular pyramid or a cone.

[0029] In order to achieve the above objective, according to another aspect of the present application, a light control film is also provided.

[0030] According to the light control film of the present application, it includes: a plurality of light absorption zones, which are arranged in an array at preset distances along a first direction; a light-transmitting zone, which is arranged between a plurality of adjacent light absorption zones; and a reflective structure, which is arranged on the side of the light incident surface close to the plurality of light absorption zones; wherein the reflective structures are arranged one-to-one with the plurality of light absorption zones, respectively, and the reflective structures reflect the light directly incident on the light absorption zones for reuse, so as to increase the transmittance of the optical component.

[0031] Beneficial effect: In the embodiment of the present application, an optimized process method is adopted to apply adhesive on the surface close to the light incident surface and located in the light transmission area, and the reflective structure layer is aligned with the light absorption area of ​​the semi-finished light control structure film and bonded and cured. By filling the light absorption material in the light absorption area and forming a groove, an adhesive layer is applied on the light incident surface, and part of the adhesive layer may also be formed in the groove in the absorption area. When bonded with the semi-finished reflective structure film, the reflective prism structure will not be flattened, so as to achieve the purpose of protecting the reflection, thereby achieving the technical effect of increasing the transmittance of the optical film, and thus solving the problem that the current light control film, due to the process method, causes the glue in the absorption area to remain on the surface of the light transmission area when filling, thereby affecting its transmittance; at the same time, the light control film inevitably needs the light transmission area and the light absorption area to appear alternately, so that the light on the light input surface will inevitably be absorbed by the absorption area, thereby losing the brightness; and the high transmittance filter light control film market, due to its complex manufacturing process cost, low yield, difficulty in mass production and other reasons, resulting in high cost technical problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the light control film of the present invention;

[0033] Figure 2 is another schematic diagram of a light control film of the present invention;

[0034] Figure 3 It is a simulation diagram of the optical effect of the light control film of the present invention;

[0035] Figure 4 is a schematic diagram of the reflective structure of the light control film of the present invention;

[0036] Figure 5 is a schematic diagram of a reflective structure of another light control film of the present invention;

[0037] Figure 6 is a schematic diagram of a method for preparing the light control film of the present invention; and

[0038] Figure 7It is a schematic diagram of the surface of the light absorption region of the method for preparing the light control film of the present invention.

[0039] The accompanying drawings are marked as follows:

[0040] 10. Light absorption area;

[0041] 20. Light-transmitting area;

[0042] 30. Reflective structure;

[0043] 40. Adhesive layer;

[0044] 50. Air zone. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] like Figure 1-7As shown, the present application relates to a method for preparing a light control film and its product. Figure 6 As shown, the method for preparing a light control film comprises the following steps:

[0050] S101, preparing a first mold of a light control structure according to preset requirements;

[0051] The first mold is selected according to the light control structure actually required to be prepared, and the mold precision determines the size and spacing of the light control structure.

[0052] S102, imprinting and curing the treated substrate and the first mold to form a structure in which a light-transmitting area and a light-absorbing area are spaced apart;

[0053] Specifically, the first mold is used to emboss the substrate to form spaced light-transmitting structural areas on the substrate; wherein the curing method can be UV curing or thermal curing, which is selected according to the material properties.

[0054] It should be noted that when UV curing, the wavelength of the UV light source should be 365nm, the curing time is 2 to 10 seconds, and the curing power is 800 to 1200W; when thermal curing, the temperature is 80°C to 100°C, and the time is controlled at 30 to 60 seconds; the actual parameter settings can be set according to usage requirements and are not limited in this application.

[0055] S103, filling and curing the light absorbing material in the light absorbing area;

[0056] It can achieve good filling and curing effects of light-absorbing materials, thus providing a basis and guarantee for subsequent coordination.

[0057] S104, removing surface absorbing materials;

[0058] Can ensure good coordination with other components in the future.

[0059] S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film;

[0060] It can achieve the effect of precise coating of adhesive, thereby forming a semi-finished light-control structure film, which in turn provides a guarantee for subsequent bonding with other components.

[0061] S106, preparing a second mold of a reflective structure according to preset requirements;

[0062] Selecting the second mold according to the reflective structure actually required can ensure accurate processing and molding effects.

[0063] S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer;

[0064] The desired reflective structure layer is obtained by using the second mold.

[0065] S108, aligning and bonding the reflective structure layer and the light absorbing area of ​​the semi-finished light control structure film, and curing them, to finally form a light control film with high transmittance.

[0066] The light-control film with high transmittance is finally obtained by aligning the reflective structure layer and the light-absorbing area of ​​the semi-finished light-control structure film, laminating and curing them.

[0067] Of course, the bonding process uses an automated bonding system to achieve high-precision alignment and bonding; a vacuum environment should be introduced during the bonding process to prevent air from being trapped between the film layers and affecting the optical performance.

[0068] The fitting accuracy is precisely controlled, and the visual inspection system is used to monitor the fitting position in real time to ensure that the reflective structure and the light control structure are accurately aligned.

[0069] During the bonding process, the pressure should be controlled at 0.5-2.0 MPa to avoid deformation of the film layer due to excessive pressure.

[0070] The light control film of the present application is coated by gravure roller precision but is not limited to gravure roller precision coating. It can also adopt slit coating, spraying and other process methods, and be dried in an oven; after passing through the oven, it is bonded to the upper film and cured by UV.

[0071] The present invention can ensure that the reflective structure area only has the light incident surface of the light absorption area, while the light incident surface of the light transmission area does not have a reflective area, and can fully reuse the light reflected back from the light incident surface of the light absorption area to improve the overall transmittance.

[0072] From the above description, it can be seen that the present application achieves the following technical effects:

[0073] In the embodiment of the present application, an optimized process method is adopted to apply adhesive on the surface close to the light incident surface and located in the light transmission area, and the reflective structure layer is aligned and bonded with the light absorption area of ​​the semi-finished light control structure film for curing. By filling the light absorption material in the light absorption area and forming a groove, an adhesive layer is applied on the light incident surface, and part of the adhesive layer may also be formed in the groove in the absorption area. When bonding with the semi-finished reflective structure film, the reflective prism structure will not be flattened, so as to achieve the purpose of protecting the reflection, thereby achieving the technical effect of increasing the transmittance of the optical film, and thus solving the problem that the current light control film, due to the process method, causes the glue in the absorption area to remain on the surface of the light transmission area when filling, thereby affecting its transmittance; at the same time, the light control film inevitably needs the light transmission area and the light absorption area to appear alternately, so that the light on the light input surface will inevitably be absorbed by the absorption area, thereby losing the brightness; and the high transmittance filter light control film market, due to its complex manufacturing process cost, low yield, difficulty in mass production and other reasons, resulting in high cost technical problems.

[0074] According to an embodiment of the present invention, preferably, S103, filling and curing the light absorbing material in the light absorbing area, includes:

[0075] like Figure 7 As shown, the mixed light absorbing material is filled and UV cured in the light absorbing area, and due to the volatilization of the solvent, a partial cavity is formed on the surface of the light absorbing area; wherein the light absorbing material includes: acrylic adhesive, polyurethane and volatile solvent.

[0076] Specifically, the main adhesive of the light-absorbing material is an acrylic adhesive, with a solid content of 60-80% and an optical refractive index n2 of 1.5-1.7; the volatile solvent is ethanol or isopropanol, which evaporates quickly;

[0077] Curing conditions: After UV curing, the solvent should be completely evaporated and some cavities should be generated on the surface of the light absorption area.

[0078] Coating thickness: The coating thickness of the light absorbing material should be 10 to 50 μm, which can be achieved by a coating machine and requires uniform thickness.

[0079] According to an embodiment of the present invention, preferably, S104, removing the surface absorption material, includes:

[0080] When the product is cured, the top film is removed and any absorbing material remaining covering the light-transmitting area is removed.

[0081] Specifically, an upper film with appropriate adhesiveness is selected, and the material may be a PET film, and the peeling force thereof is controlled at 30-100 gf / 25 mm, so as to ensure that the material in the light-transmitting area is not taken away during the tearing process, and the light-absorbing material covering the light-transmitting area can be effectively removed.

[0082] Of course, the environment should be kept clean during stripping to avoid particle contamination; electrostatic dust removal equipment can be used during the stripping process to reduce the adhesion of tiny particles and ensure the optical performance of the light-transmitting area.

[0083] According to an embodiment of the present invention, preferably, S104, removing the surface absorption material, further includes:

[0084] The surface adsorbed materials are removed by thin film adhesion removal, solvent dissolution removal, laser destruction removal or ion reaction removal.

[0085] It is possible to achieve the effect of having a variety of removal methods to choose from, thereby achieving a flexible removal effect.

[0086] According to an embodiment of the present invention, preferably, S105, coating an adhesive on a surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, includes:

[0087] The optical refractive index of the adhesive is n5, the optical refractive index of the light-transmitting area is n1, and the optical refractive index of the reflective structure layer is n4, and the following relationship is satisfied: n5≤n4, and n5≤n1 is satisfied at the same time.

[0088] According to an embodiment of the present invention, preferably, S105, coating an adhesive on a surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further includes:

[0089] The adhesive includes one or more of acrylic adhesive, polyurethane adhesive and epoxy adhesive.

[0090] According to an embodiment of the present invention, preferably, S105, coating an adhesive on a surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further includes:

[0091] The coating thickness of the adhesive is between 1 μm and 10 μm.

[0092] It can ensure good bonding effect while minimizing the impact on optical performance.

[0093] When applying the adhesive, it should only be applied to the surface of the light-transmitting area to avoid filling the light-absorbing area, which would affect the actual effect.

[0094] According to an embodiment of the present invention, preferably, S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, includes:

[0095] The size of the reflective structure layer is 0.5-100 μm, and the width of the reflective structure layer is not greater than the width of the light absorbing area.

[0096] According to an embodiment of the present invention, preferably, S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, further includes:

[0097] The reflective structure layer is in the shape of a triangular prism, a quadrangular pyramid, a triangular pyramid or a cone.

[0098] The effect of having a variety of shapes to choose from can be achieved, thereby achieving an effect that is easy to implement and convenient to operate.

[0099] The present application also relates to a light control film, comprising: a plurality of light absorption areas 10, arranged in an array at preset distances along a first direction; the light absorption area 10 refers to a light-shielding material or a light-absorbing material filled inside, such as black ink, etc., which can adjust the visible viewing angle of the light emission and control the emission viewing angle, thereby achieving an anti-peeping effect.

[0100] The first direction refers to the horizontal direction. By arranging a plurality of light absorbing regions 10 in an array at a preset distance along the horizontal direction, it is possible to precisely control the absorption, reflection or transmission behavior of light, and also to produce a specific optical effect through uniform distribution in space, such as uniform light transmittance or directional reflection.

[0101] The light absorption regions 10 are arranged in the form of an interval array along the first direction, and the absorption and distribution of light on the film surface are adjusted through different intervals and array forms to form a specific optical response. The arraying of the light absorption regions 10 helps to achieve more precise light control and avoid the local excessive light absorption or uneven light transmission phenomenon that may be caused by a single large area light absorption region 10.

[0102] The preset intervals ensure that light is evenly distributed over the entire film surface, preventing local areas from absorbing too much or too little light. By adjusting the intervals, the transmission, reflection or absorption of light of different wavelengths can be controlled to form an optical effect that meets specific needs. Accurately setting the intervals and sizes of the light absorption areas 10 helps to improve the overall efficiency of the light control film and reduce light energy loss.

[0103] It should be noted that the preset spacing can be set according to actual usage requirements and is not limited in this application.

[0104] The light-transmitting area 20 is arranged between several adjacent light-absorbing areas 10; by arranging the light-transmitting area 20 and the light-absorbing area 10 alternately, the transmission, absorption and reflection of light can be accurately controlled, thereby achieving a specific optical effect; for example: adjusting the intensity, distribution or directionality of light.

[0105] By arranging the light-transmitting area 20 between adjacent light-absorbing areas 10, the light-controlling film can achieve uniform light transmission in part or in whole, reduce shadows or local over-darkness, and is particularly suitable for scenes such as smart windows and optoelectronic display devices. The presence of the light-transmitting area 20 can improve the transparency of the light-controlling film, so that the film can automatically adjust the transparency under different lighting conditions to ensure comfortable light in the room.

[0106] The light-absorbing area 10 is responsible for absorbing or reflecting light of a specific wavelength, while the light-transmitting area 20 allows light to pass through. The combination of the two can effectively adjust the amount of light entering the system to form the desired optical effect; at the same time, by adopting an alternating arrangement, the light emission angle can be controlled to achieve a better anti-peeping viewing angle.

[0107] It should be noted that the ratio and spacing between the light-transmitting area 20 and the light-absorbing area 10 can be adjusted according to different application requirements, thereby achieving flexible control of light transmittance.

[0108] The reflective structure 30 is arranged on the light incident surface side close to the light absorption areas 10; by arranging the reflective structure 30 on the light incident surface side of the light absorption area 10, the light incident to the light absorption area can be reflected back, so as to be reused, thereby reducing light loss and enhancing light utilization, thereby optimizing light distribution and utilization;

[0109] The light is reflected back to the backlight module through the reflective structure 30, and then re-incident to the light control film through refraction and reflection, thereby improving the light utilization rate. That is, the light that was originally intended to be incident on the light absorption area is transformed into the light transmission area through the reflective structure after a series of reflections and refractions, thereby re-incident to the light absorption area.

[0110] The reflective structure 30 may be made of a highly reflective material, which can effectively reflect light and maintain the stability of the reflection direction.

[0111] It should be known that the light control film on the market includes a light output surface and a light input surface opposite thereto, and includes an optical layer with alternating absorption regions and transmission regions.

[0112] like Figure 4-5 As shown, the reflective structure 30 may be an isosceles triangular prism. More preferably, the reflective area may also be a quadrangular pyramid, a triangular pyramid, a cone or the like.

[0113] Of course, it can also be an isosceles triangular prism, and in this application, the shape is not limited.

[0114] The reflective structures 30 are respectively arranged in one-to-one correspondence with the plurality of light absorbing regions 10 , and the reflective structures 30 reflect the light directly incident on the light absorbing regions 10 for reuse, so as to increase the transmittance of the optical component.

[0115] Specifically, the reflective structures 30 are arranged one by one with the plurality of light absorption areas 10, and the light reuse efficiency is improved by reflecting the light directly incident on the light absorption area 10, thereby finally increasing the transmittance of the optical component. This can achieve accurate and effective management of light absorption, reflection and transmission, and optimize the performance of the optical system.

[0116] Each light absorption area 10 is equipped with an independent light reflecting structure 30, which can ensure that the light is reflected back to the backlight module by the light reflecting structure 30 before entering the light absorption area, and then re-enters the light transmission area, thereby improving the light utilization rate.

[0117] When light directly enters the light control film or optical component, the reflective structure 30 can effectively reflect part of the direct light back into the system, allowing it to re-enter the light absorption area 10 or the light transmission area 20; the light that was originally intended to enter the light absorption area can be reused to enhance the overall light transmittance.

[0118] Guided by the reflective structure 30, the light is reflected and reused multiple times in the system, which reduces the loss of light and significantly improves the light transmittance of the light-transmitting area 20. The reflective structure 30 optimizes the path of light so that more light can pass through the entire light control film or optical component, thereby improving the overall light efficiency of the system.

[0119] The present application proposes a light control film with high transmittance, in which a reflective structure area for secondary utilization of incident light is arranged on the light input surface, and the light that is about to be absorbed by the absorption area can be reflected back to the backlight module and reused to improve the overall transmittance of the optical component of the light control film.

[0120] The structure of the present invention can theoretically reflect light originally absorbed by the light absorption area and reuse it, which can reduce the absorption amount of the absorption area by at least 60%, thereby increasing the total transmittance by 5% to 15%.

[0121] From the above description, it can be seen that the present application achieves the following technical effects:

[0122] In the embodiment of the present application, a preset reflective structure 30 is adopted, and the reflective structure 30 is respectively arranged in a one-to-one correspondence with the plurality of light absorbing areas 10. The reflective structure 30 reflects the light directly incident on the light absorbing area 10 for reuse, so as to increase the transmittance of the optical component, thereby achieving the purpose of improving the light utilization rate, thereby achieving the technical effect of increasing the transmittance of the optical film, and further solving the current light control film. Due to its design and process problems, most light control films have a transmittance of only 50-70%, resulting in a technical problem of low light output efficiency of the backlight assembly equipped with the light control film.

[0123] Furthermore, the width of the reflective structure 30 is not greater than the width of the light absorbing area 10. It can be understood that by setting the width of the reflective structure 30 to be not greater than the width of the light absorbing area 10, that is, the width of the reflective structure 30 is less than or equal to the width of the light absorbing area 10, it is possible to not reflect the light in the transmission area, but only reflect the light incident to the light absorbing area, and reflect the light in the light absorbing area back for reuse.

[0124] Designing the reflective structure 30 to be no larger than the width of the light-absorbing area 10 can make the entire optical system more compact and orderly, which is conducive to miniaturization or lightweight design, especially in scenarios that require precise optical control; such as display devices, intelligent light control systems, etc. Ultimately, the light transmittance of the entire system is improved. Through reasonable width restrictions, the reflective structure 30 can be dynamically adjusted according to the needs of the optical components, thereby ensuring that light can be optimally utilized regardless of whether it is in strong light or weak light environments.

[0125] When the width of the reflective structure 30 matches the light absorbing area 10, the reflective material and shape can be further optimized; for example, a microstructure design with different reflection angles can be used to achieve a more efficient light utilization effect.

[0126] Therefore, the light control film of the present application is provided with a reflective structure, and the reflective structure area needs to be completely aligned with the light absorbing structure area. If the reflective structure area is aligned with the light transmitting area 20, the overall transmittance will be reduced; if the light absorbing structure area is not completely aligned, then the reflective structure area cannot achieve the desired effect.

[0127] Of course, if the light-absorbing material filled on the light-incident surface remains on the light-incident surface, it will also cause the transmittance of the product to decrease and reduce the reflection effect of the reflective structure area.

[0128] Furthermore, the width ratio of the light-transmitting area 20 to the light-absorbing area 10 is between 3:1 and 20:1. It is understandable that by adopting the above range, the light transmittance can be adjusted and a certain viewing angle anti-peeping effect can be achieved.

[0129] Specifically, the area of ​​the light-transmitting region 20 is 3 to 20 times that of the light-absorbing region 10. The larger light-transmitting region 20 ensures that light can pass through the system smoothly, while the light-absorbing region 10 is responsible for absorbing part of the light at the incident viewing angle.

[0130] Effective absorption of the light absorption zone 10: Although the light absorption zone 10 is small in area, through its position and specific absorption material or coating, the light absorption zone can absorb part of the light at a viewing angle and control the light emission viewing angle, thereby achieving the effect of viewing angle adjustment.

[0131] For example, when a smaller ratio of 3:1 is used, the area difference between the light-transmitting area 20 and the light-absorbing area 10 is smaller, which is suitable for scenes where light control is more precise; the light-absorbing area 10 can absorb more light, helping to reduce excess light or control specific light intensity in the system.

[0132] When a ratio of 20:1 is used, it is suitable for scenes that require more light to pass through but also require some light to be absorbed. The existence of the light absorption area 10 can still play a role in regulating the light, but the light transmission ability is stronger, which is suitable for applications with higher light intensity requirements.

[0133] The larger light-transmitting area 20 ensures that the optical component can allow more light to pass through, making it have a high light transmittance; although the light-absorbing area 10 is smaller in area, it can effectively absorb or filter the unwanted spectral range. It is very practical in situations where it is necessary to control light of a specific wavelength, such as infrared, ultraviolet or overly strong visible light.

[0134] The design of a large proportion of the light-transmitting area 20 can significantly improve the overall light transmittance of the optical system, allowing light to pass through the device more efficiently. Reduce light loss: By reasonably controlling the ratio of the light-transmitting area 20 and the light-absorbing area 10, high light transmittance and anti-peeping viewing angle can be achieved;

[0135] When the ratio of the light-transmitting area is large, the transmittance is high, but the black glue in the light-absorbing area is difficult to fill;

[0136] When the light transmission area ratio is small, the transmittance is low and the anti-peep angle is large.

[0137] Furthermore, the ratio of the height to the width of the light absorption region 10 is between 100:20 and 100:2. It can be understood that by setting the height-to-width ratio of the light absorption region 10 within the above range, the light absorption region 10 has a larger height and a narrower width, which can improve the light absorption efficiency and enhance the directional control of the light.

[0138] Specifically, the ratio of the height to the width of the light absorption zone 10 is 100:20 to 100:2. The height of the light absorption zone 10 is much greater than its width, ensuring that the light absorption zone 10 has sufficient contact surface on the light propagation path and can capture more incident light. At the same time, the narrower width helps to accurately control the lateral light absorption range of the light absorption zone 10 and avoid the entry of excessive scattered light.

[0139] When the ratio of 100:20 is adopted, at this wider ratio, the light absorption area 10 still has a certain lateral expansion, which is suitable for scenes that need to absorb light in a larger range; for example: environments that do not have high requirements for the incident angle.

[0140] When a ratio of 100:2 is used, the light absorption zone 10 is extremely narrow and can focus on absorbing light in a specific direction or angle, which is suitable for fine optical control, such as directional absorption of light paths and efficient capture of light energy.

[0141] Therefore, adopting the above ratio interval also has the following beneficial effects:

[0142] Height increases light contact area: Since the height of the light absorption region 10 is much greater than its width, this means that the light absorption region 10 has more opportunities to contact and absorb light on the light propagation path, which can improve the absorption efficiency, especially when the light is reflected or refracted multiple times.

[0143] Reducing lateral interference: The width limitation ensures that the light absorption area 10 mainly acts in the vertical direction of the light, reducing unnecessary lateral light interference, which is particularly suitable for devices requiring precise optical control.

[0144] Controlling the light absorption range: The narrow width enables the light absorption area 10 to absorb light from a specific direction without excessive diffusion to other areas. This is particularly critical for array optical systems and helps to improve the optical accuracy of the system.

[0145] Adapting to multiple reflection systems: In some optical systems, light will return to the light absorption area 10 after multiple reflections. A higher light absorption area 10 can ensure that more reflected light is captured, thereby improving the utilization rate of light energy.

[0146] Dynamic Light Control: Different height to width ratios can be used for different lighting scenarios. For example, a smaller width is suitable for systems that need to accurately absorb a single light path, while a larger ratio is suitable for situations that need to handle a wider range of light.

[0147] Integration of multiple optical functions: By controlling the height and width of the light absorbing area 10, it can be integrated with other optical structures (such as the light transmitting area 20 and the reflective structure) to form a complex light control system to achieve directional absorption, reflection and transmission of light.

[0148] Furthermore, the width of the light absorption region 10 is 2-20 μm, and the height of the light absorption region 10 is 20-200 μm. It is understandable that the width of the light absorption region 10 is set in the range of 2-20 μm, because the width range of the light absorption region 10 is small, it is ensured that the light absorption region 10 can efficiently concentrate light; when the width is small, light is easily absorbed and concentrated in a small range for energy conversion. This width range is particularly suitable for capturing small wavelength light and improving light absorption efficiency.

[0149] The height of the light absorption region 10 is set in the range of 20-200 μm. The height of the light absorption region 10 is relatively large relative to the width, which helps to increase the volume of the light absorption region 10, thereby increasing the light absorption depth; a higher light absorption structure can capture deeper light and avoid light scattering and loss after shallow absorption. Increasing the height also helps to enhance the stability of light absorption and reduce the reflection loss of light in the system.

[0150] Therefore, a smaller width design can effectively reduce the scattering of light outside the light absorption zone 10, so that the light absorption zone 10 can efficiently capture light and prevent excessive light from escaping; for light of different wavelengths, this width range can adjust the response of the light absorption zone 10 to light of different spectra.

[0151] A larger height range can enhance the multiple absorption effect of light, especially in an optical system. By increasing the depth of the light absorption region 10, more light is absorbed during the penetration process, thereby improving the overall absorption efficiency.

[0152] Of course, a higher height can be set according to usage requirements.

[0153] Furthermore, the optical refractive index of the light-transmitting region 20 is n1, and the optical refractive index of the light-absorbing region 10 is n2;

[0154] The relationship between the optical refractive index difference n1 and the optical refractive index difference n2 is n1-n2≥0.2. It is understood that by controlling the refractive index difference between the light-transmitting area 20 and the light-absorbing area 10, specific optical effects can be achieved, especially optimization in terms of refraction, reflection and absorption of light.

[0155] Specifically, the refractive index difference is at least 0.2, which means that the light-transmitting region 20 and the light-absorbing region 10 have obvious differences in optical properties.

[0156] When the refractive index n1 of the light-transmitting area 20 is higher, the refractive index of the light-transmitting area 20 is higher, which means that light can pass through this area more easily and the refraction of light is smaller when passing through.

[0157] When the refractive index n2 of the light absorption region 10 is low, the refractive index of the light absorption region 10 is relatively low, which means that when the region transmits light, more light may be absorbed or deflected, thereby reducing the light transmission.

[0158] The propagation behavior of light between the light-transmitting area 20 and the light-absorbing area 10 is controlled by the refractive index difference; a larger refractive index difference helps to ensure that light can be transmitted efficiently in the light-transmitting area 20, while being more absorbed or attenuated in the light-absorbing area 10; at the same time, in the case of a large refractive index difference, when light enters the light-absorbing area 10 from the light-transmitting area 20, a certain amount of reflection will occur and return to the light-transmitting area 20, so that the light energy can be reused, thereby enhancing the transmittance of the optical system.

[0159] The refractive index difference is large, n1-n2≥0.2: This difference can enhance the light separation effect; the light can be fully transmitted in the light-transmitting area 20, while the light-absorbing area 10 limits the transmission of light, enhancing the absorption or directional reflection effect of light. Specifically, the light energy of the light-transmitting area 20 can be maximized, while the light-absorbing area 10 can improve the system efficiency through optical absorption or reflection.

[0160] The larger refractive index difference can ensure that the energy flow of light between the light-transmitting area 20 and the light-absorbing area 10 is effectively controlled, so that the light energy can be better utilized, especially in the processing of multiple reflected light.

[0161] Of course, the greater the difference between the two, the better, as long as the material allows.

[0162] Furthermore, an adhesive layer 40 is provided between the light absorbing area 10 and the light reflecting structure 30;

[0163] The adhesive layer 40 is a low-refractive-index glue, and the optical refractive index of the low-refractive-index glue is n3, and satisfies the following relationship: n3≤n2. It can be understood that the adhesive layer 40 is located between the light-absorbing area 10 and the reflective structure 30, and plays the role of bonding and fixing the two areas; its optical properties have a direct impact on the optical performance of the system, especially on the propagation, reflection and absorption of light.

[0164] The function of the low refractive index glue n3 is to reduce the refraction loss of light between different media; when light enters the adhesive layer 40 from the light absorption area 10, if the refractive index of the glue is low, the refraction of the light will be gentler, thereby reducing energy loss and avoiding excessive reflection loss.

[0165] By satisfying the following relationship: n3≤n2, it means that the refractive index n3 of the adhesive layer 40 does not exceed the refractive index n2 of the light absorbing region 10, thereby preventing excessive refraction of light when passing through the adhesive layer 40 and maintaining the transmission efficiency of light.

[0166] Since n3 is small, the light will not be significantly deflected when passing through the adhesive layer 40, so that the light can enter the light absorption area 10 or the reflective structure more smoothly, thereby improving the overall optical efficiency.

[0167] On the contrary, if the refractive index of the adhesive layer 40 is too high, light will undergo greater refraction and reflection when passing between different media, resulting in light loss; by using low-refractive index glue n3, the reflection loss of light at the interface can be minimized, increasing the efficiency of light entering the light absorption area 10 and the reflective structure 30.

[0168] Due to the design of n3≤n2, light can be effectively transmitted between the light absorbing area 10 and the reflective structure 30 , and the low refractive index glue can ensure that the light will not be scattered excessively due to the difference in refractive index, thereby increasing the number of reflections of light in the system and improving the light transmittance of the light transmitting area 20 .

[0169] Preferably, the closer n3 is to vacuum, the better; of course, this area may be directly not filled with glue, thereby achieving an optimal vacuum refractive index of 1.0.

[0170] Furthermore, the optical refractive index of the reflective structure 30 is n4, and satisfies the following relationship: n3≤n4≤n1. It can be understood that ensuring the effective transmission of light between the light-transmitting area 20, the reflective structure 30 and the adhesive layer 40 reduces light loss and improves the optical efficiency of the system.

[0171] Specifically, n3≤n4 is adopted to ensure smooth transmission of light between the adhesive layer 40 and the reflective structure 30, and to avoid excessive refraction and light loss at the interface between the adhesive layer 40 and the reflective structure 30. Since the refractive index of n4 is higher than or equal to n3, the light is less refracted when entering the reflective structure 30 from the adhesive layer 40, ensuring that the light can be effectively reflected back into the system.

[0172] By adopting n4≤n1, the difference in refractive index between the reflective structure 30 and the light-transmitting area 20 is limited, so that the transmission of light from the reflective structure 30 to the light-transmitting area 20 is smoother; because n4 is not greater than n1, the light will not be refracted too much when entering the light-transmitting area 20 from the reflective structure 30, thereby reducing light dispersion and loss, ensuring that more light can enter the light-transmitting area 20, and improving light transmittance.

[0173] Therefore, by adopting the refractive index relationship of n3≤n4≤n1, the transmission and reflection efficiency of light between the light-transmitting area 20, the reflective structure 30 and the adhesive layer 40 can be optimized; the refractive index of the low-refractive index glue matches that of the reflective structure 30, thereby reducing the interface refraction loss; at the same time, the reasonable matching of the refractive index of the reflective structure 30 and the light-transmitting area 20 improves the transmittance of light and the overall optical performance of the system.

[0174] Preferably, n4=n1, and the greater the refractive index difference with n3, the better.

[0175] Furthermore, an air region 50 not filled with a substance is provided between the light absorbing region 10 and the light reflecting structure 30. It is understandable that, as a transparent medium, air has a relatively low optical refractive index (approximately 1.0), which is much lower than the refractive index of general materials; by providing the air region 50 between the light absorbing region 10 and the light reflecting structure 30, the reflection and transmission behavior of light can be optimized through the difference in refractive index between air and material.

[0176] The low refractive index of the air region 50 helps to change the propagation path of the light, reduce the loss of light at the interface of different structures, and enhance the reflection effect of the reflective structure 30. After passing through the light absorption region 10 and entering the air region 50, the light will encounter a significant change in the refractive index, causing part of the light to be reflected back to the light absorption region 10 or the reflective structure 30, further utilizing the light energy.

[0177] Furthermore, the vertex angle of the reflective structure 30 is 30°-120°. It is understandable that when the vertex angle is 30°, the smaller vertex angle helps to concentrate the incident light and form a focusing effect.

[0178] After the light is incident, it will be reflected back to the light-transmitting area 20 or other optical areas at a smaller reflection angle, which can enhance the concentrated reflection of the light, make the light energy of the system be concentrated and utilized, and increase the brightness of a specific area.

[0179] When the vertex angle is 120°, a larger vertex angle will disperse and reflect the light, expanding the coverage of the light; it is suitable for occasions where a wide distribution of light is required, such as lighting equipment or display backlight; it can make the incident light reflect at a wider angle, thereby dispersing the light in a larger range, which is suitable for scenes that require uniform light distribution. For example, it can be used in backlight modules to evenly disperse light and reduce dark areas.

[0180] Setting the vertex angle within the above range also has the following beneficial effects:

[0181] The top angle design of the reflective structure 30 directly affects the utilization rate of light. By guiding the reflected light to the light-transmitting area 20 again, the transmittance of the entire optical system can be effectively improved, so that the light in the system can be reflected and utilized more times, reducing light waste.

[0182] Different top angle designs enable the reflective structure 30 to adapt to various application requirements, achieving both efficient light focusing and providing a wide range of light distribution, thereby improving the efficiency and flexibility of the system.

[0183] Preferably, the top angle of the reflective structure 30 is 60°, 75° or 90°.

[0184] Specifically, when the top angle of the reflective structure 30 is 60°, the light can be appropriately gathered and the incident light can be reflected to a relatively concentrated area. Although it is not too narrow, it can ensure a certain reflection intensity. It is suitable for applications where light needs to be concentrated to a certain degree while maintaining uniform distribution; for example: some backlight modules or photovoltaic panels of a smaller area.

[0185] When the top angle of the reflective structure 30 is 75°, a better balance is provided in the reflective structure 30, which can achieve relatively uniform light reflection and retain a certain light concentration, so that the light can effectively cover a larger area without being too scattered. It is suitable for application scenarios that require uniform light reflection but also focus on reflection efficiency; for example: display backlight system, lighting fixtures.

[0186] When the top angle of the reflective structure 30 is 90°, the reflection angle will disperse the light widely, making the reflection path of the light close to a right angle, increasing the possibility of multiple reflections of the light in the system, thereby increasing the uniform distribution of light. It is suitable for scenes that require a wide range of light distribution, especially in large-area lighting, diffuse illumination and large-area backlight systems, where a 90° angle can provide a more uniform lighting effect.

[0187] The specific examples are further described below:

[0188] Example 1

[0189] like Figure 1 As shown, the width of the light absorption zone 10 is 2 μm, the height of the light absorption zone 10 is 100 μm, the ratio of the height to the width of the light absorption zone 10 is 100:2, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 20:1, the optical refractive index n1 of the light transmission zone 20 is 1.6, and the optical refractive index n2 of the light absorption zone 10 is 1.2; the optical refractive index n3 of the air zone 50 is 1, and the optical refractive index n4 of the reflective structure 30 is 1.5.

[0190] At this time, after testing, the performance parameters of the light control film are: the transmittance is 93%.

[0191] Example 2

[0192] like Figure 2 As shown, the difference between Example 2 and Example 1 is that an adhesive layer 40 is provided between the light absorbing area 10 and the light reflecting structure 30, and the optical refractive index n3 of the adhesive layer 40 is 1.3.

[0193] At this time, after testing, the performance parameters of the light control film are: the transmittance is 89%.

[0194] Example 3

[0195] The difference between Example 3 and Example 1 is that the width of the light absorption region 10 is 20 μm, the height of the light absorption region 10 is 200 μm, and the ratio of the height to the width of the light absorption region 10 is 200:20.

[0196] At this time, after testing, the performance parameters of the light control film are: the transmittance is 86%.

[0197] Example 4

[0198] The difference between Example 4 and Example 1 is that the width ratio of the light-transmitting region 20 to the light-absorbing region 10 is 3:1.

[0199] At this time, after testing, the performance parameters of the light control film are: the transmittance is 83%.

[0200] Example 5

[0201] The difference between Example 5 and Example 1 is that the width of the light absorption region 10 is 10 μm, the ratio of the height to the width of the light absorption region 10 is 100:10, the width ratio of the light transmission region 20 to the light absorption region 10 is 10:1, and the optical refractive index n2 of the light absorption region 10 is 1.3.

[0202] At this time, after testing, the performance parameters of the light control film are: the transmittance is 81%.

[0203] Example 6

[0204] The difference between Example 6 and Example 1 is that the width of the light absorption zone 10 is 5 μm, the height of the light absorption zone 10 is 50 μm, the ratio of the height to the width of the light absorption zone 10 is 100:10, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 5:1, the optical refractive index n1 of the light transmission zone 20 is 1.7, the optical refractive index n2 of the light absorption zone 10 is 1.4, and the optical refractive index n4 of the reflective structure 30 is 1.6.

[0205] At this time, after testing, the performance parameters of the light control film are: the transmittance is 87%.

[0206] Example 7

[0207] The difference between Example 7 and Example 1 is that the width of the light absorption zone 10 is 20 μm, the height of the light absorption zone 10 is 100 μm, the ratio of the height to the width of the light absorption zone 10 is 100:20, the ratio of the width of the light transmission zone 20 to the light absorption zone 10 is 3:1, the optical refractive index n1 of the light transmission zone 20 is 1.5, and the optical refractive index n4 of the reflective structure 30 is 1.4.

[0208] At this time, after testing, the performance parameters of the light control film are: the transmittance is 80%.

[0209] Comparative Example 1

[0210] The difference between Comparative Example 1 and Example 1 is that the light absorption area 10 and the light reflecting structure 30 are not arranged correspondingly.

[0211] At this time, after testing, the performance parameters of the light control film are: the transmittance is 70%.

[0212] Comparative Example 2

[0213] The difference between Comparative Example 2 and Example 1 is that the optical refractive index n1 of the light-transmitting region 20 is 1.55, and the optical refractive index n2 of the light-absorbing region 10 is 1.45.

[0214] At this time, after testing, the performance parameter of the light control film is: the transmittance is 75%.

[0215] The results of various embodiments and comparative examples are shown in Table 1:

[0216]

[0217]

[0218] From the above test results we can see that:

[0219] 1. It can be seen from Examples 1-7 and Comparative Example 1 that the transmittance of the light control film is significantly improved by adopting the structure of the present application.

[0220] 2. It can be seen from Example 1 and Comparative Example 2 that, under the premise that other parameters remain unchanged, the refractive index difference between the light-transmitting area 20 and the light-absorbing area 10 is only 0.1, which is far below the requirement of 0.2; the smaller refractive index difference leads to low transmission efficiency of light between the light-transmitting area 20 and the light-absorbing area 10, and the light transmission performance of the system is reduced.

[0221] It should be noted that when the refractive index difference is large, the refraction loss of light between the light-transmitting region 20 and the light-absorbing region 10 is small.

[0222] 3. It can be seen from Examples 1 and 2 that, under the premise that other parameters remain unchanged, an air region 50 or an adhesive layer 40 is provided between the light absorbing region 10 and the light reflecting structure 30, respectively, and the transmittance changes significantly.

[0223] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A method for preparing a light control film, characterized in that: The following steps are involved: S101, preparing a first mold of a light control structure according to preset requirements; S102, imprinting and curing the treated substrate and the first mold to form a structure in which a light-transmitting area and a light-absorbing area are spaced apart; S103, filling and curing the light absorbing material in the light absorbing area; S104, removing surface absorbing materials; S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film; S106, preparing a second mold of a reflective structure according to preset requirements; S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer; S108, aligning and bonding the reflective structure layer and the light absorbing area of ​​the semi-finished light control structure film, and curing them, to finally form a light control film with high transmittance.

2. The method for preparing a light control film according to claim 1, characterized in that: S103, filling and curing the light absorbing material in the light absorbing area, including: The mixed light absorbing material is filled in the light absorbing area and UV cured, and due to the volatilization of the solvent, a partial cavity is formed on the surface of the light absorbing area; wherein the light absorbing material includes: acrylic adhesive, polyurethane and volatile solvent.

3. The method for preparing a light control film according to claim 1, characterized in that: S104, Removal of surface absorbing materials, including: When the product is cured, the top film is removed and any absorbing material remaining covering the light-transmitting area is removed.

4. The method for preparing a light control film according to claim 1, characterized in that: S104, removing the surface absorbing material, further comprising: The surface adsorbed materials are removed by thin film adhesion removal, solvent dissolution removal, laser destruction removal or ion reaction removal.

5. The method for preparing a light control film according to claim 1, characterized in that: S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, including: The optical refractive index of the adhesive is n5, the optical refractive index of the light-transmitting area is n1, and the optical refractive index of the reflective structure layer is n4, and the following relationship is satisfied: n5≤n4, and n5≤n1 is satisfied at the same time.

6. The method for preparing a light control film according to claim 1, characterized in that: S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further comprising: The adhesive includes: one or more of acrylic adhesive, polyurethane adhesive, and epoxy adhesive.

7. The method for preparing a light control film according to claim 1, characterized in that: S105, applying adhesive to the surface close to the light incident surface and located in the light transmission area to form a semi-finished light control structure film, further comprising: The coating thickness of the adhesive is between 1 μm and 10 μm.

8. The method for preparing a light control film according to claim 1, characterized in that: S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, including: The size of the reflective structure layer is 0.5-100 μm, and the width of the reflective structure layer is not greater than the width of the light absorption area.

9. The method for preparing a light control film according to claim 1, characterized in that: S107, embossing and curing the treated substrate and the second mold to form a reflective structure layer, further comprising: The reflective structure layer is in the shape of a triangular prism, a quadrangular pyramid, a triangular pyramid or a cone.

10. A light control film, characterized in that include: A plurality of light absorbing regions (10) are arranged in an array along a first direction at intervals of a preset distance; A light-transmitting region (20) is disposed between a plurality of adjacent light-absorbing regions (10); and A light reflecting structure (30) is arranged on a light incident surface side close to the light absorbing regions (10); The reflective structures (30) are respectively arranged in one-to-one correspondence with a plurality of the light absorbing regions (10), and the reflective structures (30) reflect the light directly incident on the light absorbing regions (10) for reuse, thereby increasing the transmittance of the optical component.

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