Viewing angle control film, method of manufacturing the same, and printing plate

Abstract

The present application relates to a kind of view angle control film and its preparation method and version roll, it is related to liquid crystal film field, including base film and polymerizable liquid crystal material layer, the orientation of the polymerizable liquid crystal material layer on base film, the polymerizable liquid crystal material layer has regularly distributed concave-convex structure, the depth of the groove of the concave-convex structure is ≤0.1mm.The present application replaces general resin with polymerizable liquid crystal material, it has regular and continuous concave-convex structure, the convex part of this structure is opaque light scattering state, can play shielding effect to large angle light, the recessed part is completely transparent, and vertical and small angle of exit light can be completely transmitted, can shield the light of low as 30 ° of exit angle (i.e.the light of exit angle greater than or equal to 30 ° can all be realized shielding).

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid crystal film, in particular to a viewing angle control film and a preparation method thereof and a roll. BACKGROUND

[0002] Viewing angle control (privacy protection) film has a wide range of applications in privacy protection, such as display devices used in ATMs and some public places, which must be equipped with viewing angle control film, and has a strong demand. Developing new viewing angle control film will bring significant economic benefits.

[0003] The traditional "louver" type viewing angle control film utilizes the principle of refraction and total reflection of light. When the light at a large angle exits, it is refracted or totally reflected on the louver-like grid structure, resulting in the inability of the light at a large angle to exit, thereby playing a large viewing angle shielding role. However, in order to achieve total reflection of light, the grid structure must have a large protrusion. The traditional "louver" type viewing angle control film is formed by extruding resin through a roll to form a concave-convex grid structure while simultaneously curing and demolding the resin. If the light with an exit angle greater than 30° is to be shielded, the depth of the groove must be greater than 0.12 mm. The processing of such a large protrusion roll is very difficult. In addition, the resin material must be fast-curing and easy to demold. Poor curing and difficulty in demolding will result in low yield. There is an urgent need to develop a viewing angle control film that is easy to process and produce. In addition, in order to ensure the strength and durability of the "louver" structure and prevent light leakage, a dark (usually black) filling resin must be filled into the gap of the grid structure, which will result in a decrease in display brightness. This is another serious defect of the traditional "louver" type viewing angle control film. Therefore, there is an urgent need to develop a viewing angle control film that can shield light with an exit angle greater than 30°, reduce the processing difficulty of the roll, and ensure the brightness of the display. SUMMARY

[0004] Technical problem

[0005] Therefore, the present application aims to solve the technical problem of providing a viewing angle control film with good shielding effect, reduced roll processing difficulty, and ensured display brightness, as well as a preparation method thereof and a roll.

[0006] Solution

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] The application provides a viewing angle control film, comprising a base film and a polymerizable liquid crystal material layer, the polymerizable liquid crystal material layer is oriented on the base film, the polymerizable liquid crystal material layer has regularly distributed concave-convex structures, and the depth of the concave groove of the concave-convex structure is less than or equal to 0.1 mm.

[0009] Further, the depth of the concave groove of the concave-convex structure is less than or equal to 0.09 mm or less than or equal to 0.08 mm.

[0010] Further, the concave groove of the concave-convex structure has an included angle of 95-105°, and the included angle is optionally 100°.

[0011] Further, the width of the concave groove opening of the concave-convex structure is 0.05-0.08 mm, and the width is optionally 0.06 mm.

[0012] Further, the convex part of the concave-convex structure is in an opaque light scattering state, and the concave part is in a transparent state.

[0013] Further, the viewing angle control film is used for shielding light with an exit angle of less than or equal to 30°.

[0014] Further, the phase state of the polymerizable liquid crystal material layer is a nematic phase or a cholesteric phase, and the phase state is preferably a cholesteric phase.

[0015] Further, the base material is a mixture of one or more of polyester resin, polycarbonate resin, polystyrene resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, polycycloolefin resin, polyethylene resin and polyvinyl chloride resin; preferably, the base material is polyester resin PET; optionally, the thickness of the base material is 5-300 μm, and the thickness is optionally 20-200 μm, and the thickness is further preferably 20-100 μm.

[0016] Further, an orientation layer is arranged between the base material and the polymerizable liquid crystal material layer, and the orientation layer is optionally a photo-orientation layer or a rubbing orientation layer; optionally, the photo-orientation layer is coated on the surface of the base material by a doctor blade coating, a micro-concave coating, a slot coating, a spin coating or a roll coating method, and the photo-orientation layer is preferably coated by the micro-concave coating.

[0017] Further, the polymerizable liquid crystal material layer is coated on the surface of the orientation layer by a doctor blade coating, a micro-concave coating, a slot coating, a spin coating or a roll coating method.

[0018] Further, the polymerizable liquid crystal material layer comprises raw materials in the following weight percentages: 90-99.9% of a polymerizable liquid crystal compound and 0.1-10% of an initiator.

[0019] Further, the polymerizable liquid crystal compound is a polymerizable liquid crystal monomer having one or more polymerizable groups, which are optionally one or more of acryloyl, methacryloyl, fluoropropenyl, chloropropenyl, trifluoromethylpropenyl, oxetanyl, vinyl ether, vinyl ketone, maleimide, phenylmaleimide, vinyl, styryl, diacetyl, and epoxy groups. Optionally, the polymerizable liquid crystal compound has a structure as shown in Formula (I);

[0020]

[0021] Further, the initiator is one or more of benzoin compounds, benzophenone compounds, alkyl phenone compounds, acyl phosphine oxides, triazine compounds, iodonium salts, and sulfonium salts. Optionally, the initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, benzoin ethers, benzophenones, phenylethanones, benzil ketals, diaryliodonium salts, triarylsulfonium salts, diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphate, diphenyliodonium arsenate, diphenyliodonium tetrakis(pentafluorophenyl)borate, 4-methoxyphenylphenyliodonium tetrafluoroborate, 4-methoxyphenylphenyliodonium hexafluorophosphate, 4-methoxyphenylphenyliodonium hexafluoroarsenate, bis(4-tert-butylphenyl)iodonium diphenyliodonium tetrafluoroborate, bis(4-tert-butylphenyl)iodonium diphenyliodonium hexafluorophosphate, bis(4-tert-butylphenyl)iodonium diphenyliodonium trifluoromethanesulfonate, triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium tetrakis(pentafluorophenyl)borate, 4-methoxyphenyldiphenylsulfonium tetrahydroborate, 4-methoxyphenyldiphenylsulfonium tetrahydrophosphate, 4-methoxyphenyldiphenylsulfonium tetrahydroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4-methoxyphenyldiphenylsulfonium triphenylsulfonium tetrakis(pentafluorophenyl)borate, 4-phenylphenylsulfydiphenylsulfonium hexafluoroarsenate, benzil dimethyl ketal, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

[0022] Further, the polymerizable liquid crystal material layer further comprises one or more of 0-600 ppm of polymerization inhibitor, 0-3% of defoaming agent, 0-50% of diluent, 0-5% of ultraviolet absorber, 0-5% of alignment agent, 0-10% of surfactant, 0-10% of release agent, 0-20% of ultraviolet curing adhesive, and 0-20% of thermal curing adhesive, by weight. Optionally, the alignment agent has a structure as shown in Formula (II);

[0023]

[0024] And / or, the polymerizable liquid crystal material layer further comprises raw materials in the following weight ratio: 1-5% of chiral compound, optionally, the structural formula of the optional alignment agent is shown in formula (III);

[0025]

[0026] In another aspect, a preparation method of the viewing angle control film is provided, comprising the following steps:

[0027] An orientation layer is generated on the surface of the substrate by coating a photo-alignment agent or rubbing;

[0028] The raw materials of the polymerizable liquid crystal material layer are mixed in proportion, heated and kept in a liquid crystal state, coated on the orientation layer, and optionally, the thickness is 50 microns;

[0029] The polymerizable liquid crystal material is extruded by a plate roller, a high-pressure mercury lamp is used to irradiate on the other side of the substrate, the structure is solidified, and the viewing angle control film that shields light with an exit angle greater than 30° is obtained, and optionally, the mercury lamp irradiation dose is not less than 700 mJ.

[0030] Further, the plate roller has regularly distributed concave-convex structures, and the depth of the grooves of the concave-convex structures is ≤0.1 mm; optionally, the depth is ≤0.09 mm or ≤0.08 mm.

[0031] Further, the grooves of the concave-convex structures have an included angle of 95-105°, and optionally, the included angle is 100°.

[0032] Beneficial effects

[0033] The present application uses a polymerizable liquid crystal material instead of a general resin, has a regular and continuous concave-convex structure, the convex part of the structure is in an opaque light scattering state, can shield large-angle light, the concave part is completely transparent, and the vertical and small-angle exit light can be completely transmitted, and light with an exit angle as low as 30° can be shielded (that is, light with an exit angle greater than or equal to 30° can be shielded). Without the need for a grid with a very large size, the shielding of large-angle exit light can be achieved, which greatly reduces the manufacturing and processing difficulty of the plate roller and the demolding difficulty. In addition, since the grid convex part can completely shield light with a larger angle, there is no light leakage phenomenon, so the grooves do not need to be filled with light-absorbing resin, which will not cause the brightness of the display to decrease.

[0034] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application and can be implemented according to the content of the specification, at the same time, in order to make the above and other purposes, technical features and advantages of the present application more easily understood, one or more preferred embodiments are listed below, and are described in detail as follows with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0035] One or more embodiments are illustrated by way of example in the figures that are part of this disclosure and which are not intended to limit the scope of the embodiments, the same reference notations in different drawings represent the same elements, and the drawings are not to scale.

[0036] Figure 1 Structure diagram of one embodiment of the roll for preparing the polymerizable liquid crystal material layer of the viewing angle control film of the present application. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present application is not limited by the specific embodiments.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0039] In this document, relational terms such as "first" and "second", and the like, can be used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but can include other not-explicitly listed steps or elements. The terms "a" and "an" are defined as one or more unless explicitly indicated to the contrary or otherwise limited by context. The terms "includes" and "including" are defined as "comprises" or "comprising". The terms "plurality" and "a plurality" are defined as "two or more" unless explicitly indicated to the contrary or otherwise limited by context.

[0040] As shown in the drawings, the present application provides a viewing angle control film, comprising a base film and a polymerizable liquid crystal material layer, the polymerizable liquid crystal material layer is oriented on the base film, the polymerizable liquid crystal material layer has regularly distributed concave-convex structures, the depth of the concave groove of the concave-convex structure is ≤0.1mm. Figure 1 Liquid crystal material, when in a liquid crystal state, exhibits anisotropy of crystals, in which each small micro-domain is similar to the micro-crystals in crystal materials. Within the small micro-domain, the molecules are arranged in order; while the arrangement of the molecules and the molecular director of each micro-domain are different, resulting in refraction of light at the interface of the two micro-domains, and the liquid crystal material as a whole presents a scattering state, having similar characteristics as "frosted glass".

[0041]

[0042] ​The liquid crystal material can be oriented and arranged under the action of electric field, intermolecular force, etc., which is referred to as orientation of the liquid crystal. The arranged liquid crystal has regular or consistent molecular arrangement mode, and has no scattering effect on light, thus showing good transparent state. However, the orientation of the liquid crystal material has an action distance, and with the increase of the action distance, the liquid crystal molecules gradually return to the micro-domain state, and show scattering state to light.

[0043] The polymerizable liquid crystal material is used to replace the general resin. The liquid crystal material is completely transparent in the oriented state, and shows the opaque light scattering state in the non-oriented state. The grid protrusion does not need to be large in size to shield the light with large exit angle, thus greatly reducing the manufacturing and processing difficulty of the version roll and the demolding difficulty. In addition, the grid protrusion can completely shield the light with large angle, and there is no light leakage phenomenon, so the groove does not need to be filled with light-absorbing resin, and the display brightness is not reduced.

[0044] The viewing angle control film of the present application is composed of polymerizable liquid crystal material and base film. The liquid crystal material has regular and continuous concave-convex structure. The convex part of the structure is in the opaque light scattering state, and can shield the light with large angle. The concave part is completely transparent, and the light with vertical and small angle can be completely transmitted. The concave-convex structure is realized by pressing the polymerizable liquid crystal material by the version roll and polymerization.

[0045] Further, the depth of the groove of the concave-convex structure is ≤0.09mm or ≤0.08mm.

[0046] Further, the groove of the concave-convex structure has an included angle of 95-105°, and optionally has an included angle of 100°.

[0047] Further, the width of the groove opening of the concave-convex structure is 0.05-0.08mm, and optionally is 0.06mm.

[0048] Further, the convex part of the concave-convex structure is in the opaque light scattering state, and the concave part is in the transparent state.

[0049] Further, the viewing angle control film is used to shield the light with exit angle as low as 30°, that is, the light with an angle ≥30° can be shielded.

[0050] Further, the phase state of the polymerizable liquid crystal material can be nematic phase or cholesteric phase. From the phase state, the liquid crystal in the nematic phase and the cholesteric phase both show light scattering state, but the cholesteric phase liquid crystal micro-domain has a spiral structure, and relatively, the cholesteric phase liquid crystal has stronger light scattering effect than the nematic phase liquid crystal. The cholesteric phase liquid crystal is obtained by adding a chiral compound to the nematic phase liquid crystal.

[0051] Further, the substrate is a mixture of one or more of polyester resin, polycarbonate resin, polystyrene resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, polycycloolefin resin, polyethylene resin and polyvinyl chloride resin; preferably polyester resin PET; optionally, the thickness of the substrate is 5-300 μm, optionally 20-200 μm, further preferably 20-100 μm.

[0052] In order to realize the orientation of the polymerizable liquid crystal material close to the substrate, an orientation layer can be added or not added between the liquid crystal material and the substrate as needed. Further, an orientation layer is provided between the substrate and the polymerizable liquid crystal material layer, which is optionally a photo-orientation layer or a rubbing orientation layer; the photo-orientation layer is coated on the surface of the substrate by a method of doctor blade coating, micro-embossing coating, slot coating, spin coating or roll coating, preferably micro-embossing coating with high coating efficiency and low cost.

[0053] Further, the polymerizable liquid crystal material layer is coated on the surface of the orientation layer by a method of doctor blade coating, micro-embossing coating, slot coating, spin coating or roll coating, preferably micro-embossing coating with high coating efficiency and low cost.

[0054] Further, the polymerizable liquid crystal material layer comprises raw materials in the following weight percentage: 90-99.9% of polymerizable liquid crystal compound, 0.1-10% of initiator.

[0055] Further, the polymerizable liquid crystal compound is also called polymerizable liquid crystal monomer, and the polymerizable liquid crystal compound is a polymerizable liquid crystal monomer with one or more polymerizable groups, which are optionally one or more of acryloyl group, methacryloyl group, fluoropropenyl group, chloropropenyl group, trifluoromethylpropenyl group, oxetanyl group, vinyl ether group, vinyl ketone group, maleimide group, phenyl maleimide group, vinyl group, styryl group, diacetyl group and epoxy group.

[0056] Further, the initiator is one or more of benzoin compound, benzophenone compound, alkyl phenone compound, acyl phosphine oxide, triazine compound, iodonium salt and sulfonium salt. For example, one or more of benzoyl oxide, azobisisobutyronitrile, benzoin ethers, benzophenones, phenylethanones, benzil ketals, diaryliodonium salts, triarylsulfonium salts, diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphonate, diphenyliodonium arsenic acid salt, diphenyliodonium tetrakis(pentafluorophenyl)borate, 4-methoxyphenylphenyliodonium tetrafluoroborate, 4-methoxyphenylphenyliodonium hexafluorophosphonate, 4-methoxyphenylphenyliodonium hexafluoroarsenate, bis(4-tert-butylphenyl) iodonium diphenyl iodonium tetrafluoroborate, bis(4-tert-butylphenyl) iodonium diphenyl iodonium hexafluorophosphonate, bis(4-tert-butylphenyl) iodonium diphenyl iodonium trifluoromethanesulfonate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium tetrakis(pentafluorophenyl)borate, 4-methoxyphenyldiphenylsulfonium tetrahydroborate, 4-methoxyphenyldiphenylsulfonium tetrahydrophosphonate, 4-methoxyphenyldiphenylsulfonium tetrahydroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4-methoxyphenyldiphenylsulfonium triphenylsulfonium tetrakis(pentafluorophenyl)borate, 4-phenylphenylsulfanyl diphenylsulfonium hexafluoroarsenate, benzil dimethyl ketal and bis(2,4,6-trimethylbenzoyl)-phenyl phosphine oxide. The photoinitiator and thermal initiator are not strictly distinguished, and the above initiators can be either photoinitiator or thermal initiator, which is determined by the polymerization mode.

[0057] Further, the polymerizable liquid crystal material layer further comprises one or more of the following raw materials in the following weight ratio: 0-600 ppm of polymerization inhibitor, 0-3% of defoaming agent, 0-50% of diluent, 0-5% of ultraviolet absorber, 0-5% of alignment agent, 0-10% of surfactant, 0-10% of release agent, 0-20% of ultraviolet curing adhesive and 0-20% of thermal curing adhesive.

[0058] In another aspect, a method for preparing the viewing angle control film is provided, comprising the following steps:

[0059] An orientation layer is generated on the surface of the substrate by coating a photo-alignment agent or rubbing;

[0060] The raw materials of the polymerizable liquid crystal material layer are mixed in proportion, heated and kept in a liquid crystal state, coated on the orientation layer, and optionally, the thickness is 50 microns;

[0061] The polymerizable liquid crystal material is extruded by a plate roller, irradiated by a high-pressure mercury lamp on the other side of the substrate, and the structure is cured to obtain a viewing angle control film that shields light with an exit angle greater than 30°, and optionally, the mercury lamp irradiation dose is not less than 700 mJ.

[0062] Further, the plate roll has regularly distributed concave-convex structures, the depth of the grooves of the concave-convex structures is ≤0.1 mm; optionally the depth is ≤0.09 mm or ≤0.08 mm.

[0063] Further, the grooves of the concave-convex structures have an included angle of 95-105°, optionally an included angle of 100°.

[0064] The following are some specific embodiments of the present application:

[0065] Embodiment 1

[0066] 1) Dissolve the photo-alignment agent shown in formula (II) in butanone to prepare a 2% solution.

[0067]

[0068] 2) Apply it on a polyester PET film of type T960E50C (Mitsubishi Chemical Corporation) using micro-embossing, dry at 60°C for 1 minute to obtain a coating with a thickness of about 100 nm. Place the coating under polarized UV light for 5 seconds, the irradiation dose is greater than 20 mJ (at 365 nm), the light source is a high-pressure mercury lamp.

[0069] 3) Prepare a polymerizable liquid crystal material by mixing the polymerizable liquid crystal compound shown in formula (I) (synthesized according to Makromol. Chem. 190, 2255-2268 (1989)) and the photoinitiators IRGACURE 184, IRGACURE TPO in a ratio of 96%, 3%, 1%, add 400 ppm of the polymerization inhibitor BHT, heat the mixture to 100°C, stir until uniform, and keep it in a liquid crystal state. Apply the polymerizable liquid crystal material to the surface of the photo-alignment layer irradiated by polarized UV light using a slot coating method, the thickness is 50 microns. Use the plate roll with the microstructure shown in formula (III) to press, at the same time, irradiate the other side of the substrate with a high-pressure mercury lamp to immediately solidify the formed microstructure. The irradiation dose is not less than 700 mJ. After demolding, an angle-of-view control film is obtained which shields light with an exit angle as low as 30°. Figure 1

[0070]

[0071] Embodiment 2

[0072] ​A polyester PET film of T960E50C (Mitsubishi Chemical Corporation) was rubbed with HC-20 (TAENAKA PILE FABRICS Co., Ltd.) polyester friction cloth to create grooves approximately 30 nanometers deep on its surface. These grooves allow for the orientation of a polymerizable liquid crystal material coated thereon. A polymerizable liquid crystal material was prepared by mixing a polymerizable liquid crystal compound having the chemical structure shown in Formula (I), a chiral compound (Formula (III)), and photoinitiators IRGACURE 184 and IRGACURE TPO in a ratio of 93%, 3%, 3%, and 1%, respectively. 400 ppm of the polymerization inhibitor BHT was added, and the mixture was heated to 100°C and stirred until homogeneous, maintaining it in a liquid crystal state. This polymerizable liquid crystal material was then coated onto the rubbed-oriented substrate surface using a slot coating method to a thickness of 50 micrometers. [The text abruptly ends here, likely due to an incomplete translation or missing information.] Figure 1 The microstructure shown is formed by roller extrusion and simultaneous irradiation with a high-pressure mercury lamp on the other side of the substrate, causing the microstructure to solidify immediately. The irradiation dose is not less than 700 millijoules. After demolding, a viewing angle control film with a shielding angle greater than 30° is obtained.

[0073]

[0074] Comparative Example 1

[0075] BASF Laromer 9000 resin and HybridResin715N70 resin from Zhongshan Juli Organosilicon Technology Co., Ltd. were mixed in an 8:2 ratio to form a mixed resin. Initiator IRGACURE 184 and IRGACURE TPO were added in proportions of 96%, 3%, and 1%, respectively, along with 300 ppm of polymerization inhibitor BHT. This mixture was then coated onto a 50-micron thick T960E50C (Mitsubishi Chemical Corporation) polyester PET film using a slot coating method, followed by application of... Figure 1 The microstructure shown is formed by roller extrusion and simultaneous irradiation with a high-pressure mercury lamp on the other side of the substrate, causing the microstructure to solidify immediately. The irradiation dose is not less than 1000 millijoules. After demolding, a viewing angle control film is obtained that blocks light with an emission angle greater than 47°, with a blocking range much smaller than that of the example.

[0076] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form disclosed, and various modifications and variations are possible in light of the above teachings. It is intended that the embodiments described be chosen and described in order to explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and various embodiments with various modifications as are suited to the particular use contemplated. Any simple modification, equivalent, and alternative changes, as they come to mind to one skilled in the art, can be made to the above-described exemplary embodiments, without departing from the scope of the application.

Claims

1. A method for producing a viewing angle control film, characterized by, It comprises the following steps: forming a photo-alignment layer on the substrate surface by coating a photo-alignment agent; mixing the raw materials of the polymerizable liquid crystal material layer in proportion, heating, and keeping in a liquid crystal state, coating on the photo-alignment layer, and the thickness is 50 microns, the polymerizable liquid crystal material layer is coated on the surface of the photo-alignment layer by a plate roller coating method; using a plate roller to extrude the polymerizable liquid crystal material, and using a high-pressure mercury lamp to irradiate on the other side of the substrate to make the structure solidify, and the obtained viewing angle control film is used to shield light with an exit angle as low as 30°, and the mercury lamp irradiation dose is not less than 700 mJ; the polymerizable liquid crystal material layer is aligned on the base film, the polymerizable liquid crystal material layer has regularly distributed concave-convex structures, the depth of the grooves of the concave-convex structures is ≤0.09 mm, the grooves of the concave-convex structures have an included angle of 95-105°, and the width of the opening of the grooves of the concave-convex structures is 0.05-0.08 mm; the convex part of the concave-convex structure is in an opaque light scattering state, and the concave part is in a transparent state; the polymerizable liquid crystal material layer comprises the following raw materials in weight percentage: 90-99.9% of a polymerizable liquid crystal compound and 0.1-10% of an initiator; the structural formula of the polymerizable liquid crystal compound is shown in formula (I); 。 2. The method for producing a view angle control film according to claim 1, wherein the depth of the grooves of the concave-convex structures is ≤0.08 mm; and / or, the grooves of the concave-convex structures have an included angle of 100°; and / or, the width of the opening of the grooves of the concave-convex structures is 0.06 mm.

3. The method of producing a viewing angle control film according to any one of claims 1 and 2, characterized by, The phase state of the polymerizable liquid crystal material layer is nematic phase or cholesteric phase.

4. The method of claim 3, wherein the method is performed by a process comprising: The phase state of the polymerizable liquid crystal material layer is cholesteric phase.

5. The method of claim 4, wherein the film is prepared by a method comprising: The substrate uses a mixture of one or more of polyester resin, polycarbonate resin, polystyrene resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, polycycloolefin resin, polyethylene resin, and polyvinyl chloride resin; and the thickness of the substrate is 5-300 µm.

6. The method of producing a viewing angle control film according to claim 5, wherein The substrate uses polyester resin PET; and the thickness of the substrate is 20-200 µm.

7. The method of claim 6, wherein the method is performed by a process comprising: The thickness of the substrate is 20-100 µm.

8. The method of claim 7, wherein the method is performed by a process comprising: The photo-alignment layer is coated on the surface of the substrate by a doctor blade coating, micro-indentation coating, slot coating, spin coating, or plate roller coating method.

9. The preparation method of the viewing angle control film according to claim 8, the photo-alignment layer is coated by micro-indentation coating.

10. The method of producing a viewing angle control film according to claim 9, wherein The initiator uses one or more of benzoin compound, benzophenone compound, alkyl phenone compound, acyl phosphine oxide, triazine compound, iodonium salt, and sulfonium salt.

11. The method of claim 9, wherein the method is performed by a process comprising: The initiator is selected from one or more of benzoyl oxide, azobisisobutyronitrile, benzoin ethers, benzophenones, acetophenones, benzil ketals, diaryliodonium salts, triarylsulfonium salts, diphenyliodonium tetrafluorob orate, diphenyliodonium hexafluorophosphonate, diphenyliodonium arsenic acid salt, diphenyliodonium tetra(pentafluorophenyl)borate, 4-methoxyphenylphenyliodonium tetrafluorob orate, 4-methoxyphenylphenyliodonium hexafluorophosphonate, 4-methoxyphenylphenyliodonium hexafluoroarsenic acid salt, bis(4-tert-butylphenyl) iodonium diphenyliodonium tetrafluorob orate, bis(4-tert-butylphenyl) iodonium diphenyliodonium hexafluorophosphonate, bis(4-tert-butylphenyl) iodonium diphenyliodonium trifluoromethanesulfonate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenic acid salt, triphenylsulfonium tetra(pentafluorophenyl)borate, 4-methoxyphenyldiphenylsulfonium tetrahydroborate, 4-methoxyphenyldiphenylsulfonium tetrahydrophosphonate, 4-methoxyphenyldiphenylsulfonium tetrahydroarsenic acid salt, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4-methoxyphenyldiphenylsulfonium triphenylsulfonium tetra(pentafluorophenyl)borate, 4-phenylphenylsulfydiphenylsulfonium hexafluoroarsenic acid salt, benzil dimethyl ketal, and bis(2,4,6-trimethylbenzoyl)-phenyl phosphine oxide.

12. The method of claim 11, wherein the method is performed by a process comprising: The polymerizable liquid crystal material layer further comprises one or more of the following raw materials in the following weight ratio: 0-600 ppm of polymerization inhibitor, 0-3% of defoaming agent, 0-50% of diluent, 0-5% of ultraviolet absorber, 0-5% of alignment agent, 0-10% of surfactant, 0-10% of release agent, 0-20% of ultraviolet curing adhesive, and 0-20% of thermal curing adhesive; the structure of the alignment agent is shown in formula (II); ； And / or, the polymerizable liquid crystal material layer further comprises one or more of the following raw materials in the following weight ratio: 1-5% of chiral compound, the structure of the chiral compound is shown in formula (III); 。

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