Gloss-enhancing reflective film in the form of a layered product, method of making the same, and LCD display

Abstract

The application discloses a light reflection film in a layered product form and a preparation method and an LCD display, and relates to the technical field of liquid crystal display.The light reflection film in the layered product form comprises a substrate layer, a pre-coating layer, a prism structure layer and a bonding layer arranged in sequence, the prism structure layer is adhered to the substrate layer through the pre-coating layer, the prism structure layer utilizes the alternately arranged triangular structure and semicircular structure to significantly improve the reflectivity, reduces the loss of light at the substrate interface, and further improves the light output efficiency; the setting of the bonding layer with specific thickness and composition improves the durability and scratch resistance of the reflection film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of layered products, in particular to a light-reflecting film in the form of a layered product and a preparation method thereof and an LCD display. BACKGROUND

[0002] In an LCD display, a backlight module is a crucial factor affecting the final imaging brightness, contrast and color saturation. Among them, the reflective film is located at the bottom of the backlight module, and the main function is to reflect the light leaked from the light guide plate into the light guide plate, thereby reducing the loss of light and improving the light utilization rate and overall brightness of the backlight module. Due to the structure on the surface of the reflective film, it may cause scratches on the light guide plate.

[0003] Therefore, it is urgent to improve the reflective film to improve the reflectivity of the reflective film while preventing damage to the light guide plate.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The present application relates to the technical field of layered products, in particular to a light-reflecting film in the form of a layered product and a preparation method thereof and an LCD display.

[0006] The present application is realized in this way:

[0007] In a first aspect, the present application provides a light-reflecting film in the form of a layered product, comprising a substrate layer, a pre-coating layer, a prism structure layer and a bonding layer arranged in sequence;

[0008] The pre-coating layer contains an organic adhesive;

[0009] The prism structure layer includes triangular structures and semicircular structures, and the triangular structures and the semicircular structures are arranged alternately;

[0010] The base of the triangular structure is attached to the pre-coating layer, and the triangular structure extends from one end of the pre-coating layer to the opposite end;

[0011] The base of the semicircular structure is attached to the pre-coating layer, and the semicircular structure extends from one end of the pre-coating layer to the opposite end;

[0012] The triangular structure is an isosceles triangle, the base length is 10-20 μm, and the height is 10-20 μm; the top angle of the triangular structure is 85-95°; the radius of the semicircular structure is 5-10 μm;

[0013] The thickness of the adhesive layer is 50-100 microns; the main material of the adhesive layer is ethylene-vinyl acetate copolymer or polyolefin elastomer, and the adhesive layer contains inorganic fluorescent powder, and the mass fraction of the inorganic fluorescent powder in the adhesive layer is 0.1-0.5%.

[0014] In an optional embodiment, the triangular structure and the semicircular structure are formed by UV curing resin glue transfer printing, and the UV curing resin glue includes, in terms of mass fraction, 40-50 parts of base resin, 1-5 parts of photoinitiator, 40-50 parts of diluent, and 1-5 parts of first leveling agent;

[0015] The base resin is selected from at least one of bisphenol F type epoxy resin, epoxy acrylate resin, resorcinol type epoxy resin, and bisphenol F / A blended type epoxy resin;

[0016] The photoinitiator is selected from at least one of 4,6-trimethylbenzoyl diphenyl phosphine oxide and 1-hydroxycyclohexyl phenyl ketone;

[0017] The diluent is selected from at least one of ethyl acetate, propylene glycol methyl ether acetate, acetone, and butanone;

[0018] The first leveling agent is selected from at least one of polyether modified siloxane and polyacrylate.

[0019] In an optional embodiment, the coating liquid for forming the pre-coating layer includes, in terms of mass fraction, 40-60 parts of acrylate resin, 20-30 parts of organic solvent, 5-10 parts of dispersant, 5-10 parts of second leveling agent, and 10-20 parts of auxiliary crosslinking agent;

[0020] The dispersant is selected from at least one of anionic polyacrylate dispersant and modified polyacrylate dispersant;

[0021] The second leveling agent is selected from at least one of polyether modified siloxane and polyacrylate;

[0022] The auxiliary crosslinking agent is selected from at least one of triallyl isocyanurate, trimethylolpropane trimethacrylate, and N,N-methylene bisacrylamide.

[0023] In an optional embodiment, the thickness of the pre-coating layer is 10-20 microns;

[0024] And / or, the thickness of the substrate layer is 100-200 microns;

[0025] And / or, the material of the substrate layer is selected from at least one of polyethylene, polypropylene, polycarbonate, polyhexamethylene adipate, polyethylene terephthalate, polyvinylidene fluoride, and polybutylene terephthalate.

[0026] In an optional embodiment, the light transmittance of the bonding layer is greater than 93%.

[0027] In an optional embodiment, a nano-pillar array structure is arranged on the surface of the bonding layer, the height of the nano-pillar array structure is 100-150 nm, the distance between two adjacent nano-pillars is 200-300 nm, and the diameter of the nano-pillar is 50-150 nm.

[0028] In an optional embodiment, the bonding layer formula solution comprises 30-40 parts of initiator, 15-20 parts of crosslinking agent, and 15-20 parts of coupling agent, the initiator is tert-amyl peroxy-2-ethylhexyl carbonate, the crosslinking agent is triallyl isocyanurate, and the coupling agent is 3-methacryloyloxypropyl trimethoxysilane.

[0029] In a second aspect, the present application provides a preparation method of the light reflection film in the form of the layered product in any of the foregoing embodiments, comprising: sequentially preparing a pre-coating layer, a prism structure layer, and a bonding layer on a substrate layer.

[0030] In an optional embodiment, the method comprises: coating a coating liquid for forming the pre-coating layer on the substrate layer, and forming the pre-coating layer after drying;

[0031] The UV curing resin glue is coated on the surface of the pre-coating layer, and then the coated resin layer is imprinted using a transfer mold with a triangular structure and a semicircular structure, so that the convex part of the mold forms corresponding concave parts on the resin layer, thereby forming the prism structure;

[0032] The monomer particles are preheated, mixed with the formula solution added with inorganic fluorescent powder, and uniformly mixed in a stirred tank, the mixed particles are extruded and showered on the prism structure layer, and after UV irradiation, nano-imprinting is performed to form the bonding layer.

[0033] In a third aspect, the present application provides an LCD display comprising a backlight module, wherein the backlight module comprises the light reflection film in the form of the layered product in any of the foregoing embodiments or the light reflection film in the form of the layered product prepared by the preparation method in any of the foregoing embodiments.

[0034] The light reflection film provided by the present application comprises a substrate layer, a pre-coating layer, a prism structure layer, and a bonding layer arranged in sequence, the prism structure layer is adhered to the substrate layer through the pre-coating layer, the prism structure layer significantly improves the reflectivity by using the triangular structure and the semicircular structure arranged alternately, reduces the loss of light at the substrate interface, and further improves the light output efficiency; the bonding layer with a specific thickness and composition improves the durability and scratch resistance of the reflection film. BRIEF DESCRIPTION OF DRAWINGS

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the first-view structure of the light-enhancing reflective film provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the second-view structure of the light-enhancing reflective film provided in an embodiment of the present invention.

[0038] Icons: 101 - Substrate layer; 102 - Pre-coating layer; 103 - Prism structure layer; 1031 - Triangular structure; 1032 - Semi-circular structure; 104 - Adhesive layer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0040] To improve the reflectivity of the reflective film in the backlight module and protect the light-blocking plate, embodiments of the present invention provide a light-enhancing reflective film in the form of a layered product, such as... Figure 1 and Figure 2 As shown, the light-enhancing reflective film includes a substrate layer 101, a pre-coating layer 102, a prism structure layer 103, and an adhesive layer 104 arranged sequentially. The pre-coating layer 102 contains an organic adhesive. The prism structure layer 103 is bonded to the substrate layer 101 through the pre-coating layer 102. The adhesive layer 104 is used to bond the light-enhancing reflective film to the light guide plate, while also preventing scratches on the light guide plate.

[0041]

Substrate Layer 101

[0042] The substrate layer 101 is the base material of the light-enhancing and reflective film, and the specific material is not limited.

[0043] In some embodiments, the substrate layer 101 is made of at least one of polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyhexamethylene adipamide (PA66), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), and polybutylene terephthalate (PBT). The substrate layer 101 can be made of any one or more of these materials. Preferably, the substrate layer 101 is made of PET film. The high reflectivity of the PET substrate reduces light loss at the substrate interface, further improving light output efficiency.

[0044] The thickness of the substrate layer 101 is 100μm-200μm, such as 100μm, 130μm, 150μm, 180μm, 200μm, etc.

[0045]

Pre-coating 102

[0046] The pre-coating layer 102 contains an organic adhesive, which can bond the prism structure layer 103 to the substrate layer 101, thereby improving the bonding strength between the two.

[0047] In some embodiments, the coating liquid used to form the pre-coating 102, by weight, comprises: 40-60 parts of acrylate resin, 20-30 parts of organic solvent, 5-10 parts of dispersant, 5-10 parts of second leveling agent, and 10-20 parts of co-crosslinking agent. Optimizing the composition of the coating liquid forming the pre-coating 102 significantly improves the adhesion between the substrate layer 101 and the prism structure layer 103, preventing delamination. The specific type of acrylate resin is not limited; it can be a commonly used acrylate adhesive, such as tri(propylene glycol) diacrylate. The type of organic solvent is not limited; it can be ethyl acetate, propylene glycol methyl ether acetate, acetone, methyl ethyl ketone, etc. The dispersant is selected from at least one of anionic polyacrylate dispersants and modified polyacrylate dispersants; the dispersant can be any one or more of the above. The second leveling agent is selected from at least one of polyether-modified siloxane polyacrylates; the second leveling agent can be any one or more of the above. The co-crosslinking agent is selected from at least one of triallyl isocyanurate, trimethylolpropane trimethacrylate, and N,N-methylenebisacrylamide. The co-crosslinking agent can be any one or more of the above.

[0048] Specifically, the amount of acrylate resin can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, etc.; the amount of organic solvent can be 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, etc.; the amount of dispersant can be 5 parts, 8 parts, 10 parts, etc.; the amount of second leveling agent can be 5 parts, 8 parts, 10 parts, etc.; and the amount of crosslinking agent can be 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, etc.

[0049] In some embodiments, the thickness of the pre-coating 102 is 10μm-20μm, such as 10μm, 13μm, 15μm, 18μm, 20μm, etc. The thickness of the pre-coating 102 within the above range is beneficial to further improve the adhesion between the substrate layer 101 and the prism structure layer 103.

[0050]

Prism Structure Layer 103

[0051] The prism structure layer 103 includes a triangular structure 1031 and a semi-circular structure 1032, which are alternately arranged, meaning that both sides of the triangular structure 1031 are semi-circular structures 1032, and both sides of the semi-circular structure 1032 are triangular structures 1031. The bottom surface of the triangular structure 1031 is attached to the pre-coating layer 102, and the triangular structure 1031 extends from one end of the pre-coating layer 102 to the opposite end; similarly, the bottom surface of the semi-circular structure 1032 is attached to the pre-coating layer 102, and the semi-circular structure 1032 extends from one end of the pre-coating layer 102 to the opposite end. The prism structure layer helps to change the incident and reflection paths of light, improves reflectivity and uniformity, reduces glare, and enhances the display effect.

[0052] In some embodiments, the radius of the semicircular structure 1032 is 5μm-10μm; the triangular structure 1031 can be an isosceles triangle with a base length of 10μm-20μm, a height of 10μm-20μm, and a vertex angle of 85°-95°. By optimizing the size and shape of the semicircular structure 1032 and the triangular structure 1031, the reflectivity can be further improved. The size of the vertex angle of the triangular structure 1031 has a significant impact on the reflectivity, and the reflectivity reaches its optimal value within the range of 85°-95° ​​(e.g., 90°).

[0053] Specifically, the radius of the semi-circular structure 1032 can be 5μm, 8μm, 10μm, etc.; the base length of the triangular structure 1031 can be 10μm, 13μm, 15μm, 18μm, 20μm, etc.; the height of the triangular structure 1031 can be 10μm, 13μm, 15μm, 18μm, 20μm, etc.; and the vertex angle of the triangular structure 1031 can be 85°, 88°, 90°, 92°, 95°, etc.

[0054] It should be noted that when light escapes from the light guide plate and strikes the reflective film, after the light shines on the surface of the prism structure layer 103, when it strikes the isosceles triangular structure, the light is reflected to the semicircular structure 1032 or the isosceles triangular structure layer on the other side, and after multiple reflections, it re-enters the light guide plate; when the light strikes the semicircular structure 1032, the light is reflected to the isosceles triangular structure, and then strikes the light guide plate, thus improving the reflectivity.

[0055] In some embodiments, the triangular structure 1031 and the semi-circular structure 1032 are formed by transfer printing with a UV-curable resin adhesive. The UV-curable resin adhesive, by weight, comprises 40-50 parts of a base resin, 1-5 parts of a photoinitiator, 40-50 parts of a diluent, and 1-5 parts of a first leveling agent. Optimizing the composition of the UV-curable resin adhesive can further improve reflectivity. The matrix resin is selected from at least one of bisphenol F type epoxy resin, epoxy acrylate resin, resorcinol type epoxy resin, and bisphenol F / A blend epoxy resin. The type of matrix resin can be any one or more of the above, preferably tris(propylene glycol) diacrylate. The photoinitiator is selected from at least one of 4,6-trimethylbenzoyl diphenylphosphine oxide and 1-hydroxycyclohexyl benzophenone. The type of photoinitiator can be any one or more of the above. The diluent is selected from at least one of ethyl acetate, propylene glycol methyl ether acetate, acetone, and butanone. The type of diluent can be any one or more of the above. The first leveling agent is selected from at least one of polyether modified siloxane and polyacrylate. The type of first leveling agent can be any one or more of the above.

[0056]

Adhesive Layer 104

[0057] An additional adhesive layer 104 is applied to the surface of the prism structure layer 103 to improve its reflectivity and luminance. The transmittance of the adhesive layer 104 should preferably be greater than 93%.

[0058] In some embodiments, the main material of the adhesive layer 104 is ethylene-vinyl acetate copolymer (EVA) or polyolefin elastomer (POE). A layer of adhesive film (such as a high-transparency EVA film) is coated on the prism structure layer to prevent scratches on the light guide plate and to provide excellent adhesion. Both the transfer layer and the EVA adhesive layer are UV-cured systems, which helps to reduce the number of processes and lower manufacturing costs.

[0059] In a preferred embodiment, the adhesive layer 104 further contains inorganic phosphor, which accounts for 0.1%-0.5% of the mass fraction of the adhesive layer formulation solution, such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc. The adhesive layer formulation solution includes: 30-40 parts of initiator, 15-20 parts of crosslinking agent, and 15-20 parts of coupling agent. The initiator is 2-ethylhexyl carbonate tert-amyl peroxide, the crosslinking agent is triallyl isocyanurate, and the coupling agent is 3-methacryloyloxypropyltrimethoxysilane. Adding a specific amount of inorganic phosphor is beneficial for absorbing external energy (such as blue light) and converting it into visible light (i.e., being able to absorb blue light and re-emit longer wavelength light), thereby reducing the harm of blue light to the human eye, improving display color quality, and increasing display brightness. Compared to adding inorganic phosphors to the reflective coating, this embodiment of the invention achieves better dispersion by adding inorganic phosphors to the adhesive layer 104 (such as EVA), thereby improving the conversion of blue light. The type of inorganic phosphor is not limited, and it can be aluminate phosphors, molybdate phosphors, etc.

[0060] Furthermore, the thickness of the adhesive layer 104 is 50μm-100μm, such as 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., to ensure good light transmittance and flexibility. A nanopillar array structure is formed on the surface of the adhesive layer 104. The height of the nanopillar array structure is 100nm-150nm (such as 100nm, 110nm, 120nm, 130nm, 140nm, 150nm, etc.); the spacing between two adjacent nanopillars is 200nm-300nm (such as 200nm, 230nm, 250nm, 280nm, 300nm, etc.); and the diameter of the nanopillars is 50nm-150nm (such as 50nm, 80nm, 100nm, 120nm, 150nm, etc.). After conventional reflective film transfer, it is easy to cause misalignment and scratch the light guide plate because it cannot be tightly bonded to the upper light guide plate. In this embodiment of the invention, nanoimprinting technology is used to manufacture a nanopillar array structure with a period of 200-300nm on the surface of materials such as EVA, thereby significantly increasing the contact area between EVA and the light guide plate, enhancing the bonding strength by about 40%, and improving the scratch resistance by about 25%.

[0061] Specifically, nanoimprinting technology is a method of transferring nanostructure patterns on a template onto photoresist (or thermoplastic material) through mechanical imprinting, and it is the existing method for preparing nanopillar array structures.

[0062] This invention also provides a method for preparing a light-enhancing and reflective film in the form of a layered product, comprising: sequentially preparing a pre-coating layer 102, a prism structure layer 103, and an adhesive layer 104 on a substrate layer 101, wherein the composition and thickness of each layer are as described above in the specification.

[0063] In some embodiments, the method for preparing a light-enhancing reflective film in the form of a layered product includes: coating a substrate layer 101 with a coating liquid for forming a pre-coating layer 102 (the composition of the coating liquid is described above in the specification), and drying it to form the pre-coating layer 102; coating the surface of the pre-coating layer 102 with a UV-curable resin adhesive, and then imprinting the coated resin layer using a transfer mold with a triangular structure 1031 and a semi-circular structure 1032, wherein the raised portion of the mold forms a corresponding depression on the resin layer, thereby forming a prism structure layer 103, the composition of the UV-curable resin adhesive being described above in the specification; mixing preheated monomer particles with a formulation solution containing inorganic phosphors and mixing them uniformly in a stirring tank, extruding the mixed particles onto the prism structure layer 103, and performing nanoimprinting after UV irradiation to form an adhesive layer 104. The monomer particles can be EVA particles, and the size of the nanopillar array formed by nanoimprinting is described above in the specification.

[0064] This invention also provides an LCD display, including a backlight module. The backlight module includes a light-enhancing reflective film in the form of a layered product provided in this invention. Improvements to the light-enhancing reflective film are beneficial to improving the optical performance of the LCD display.

[0065] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0066] Example 1

[0067] This embodiment provides a method for preparing a light-enhancing and reflective film in the form of a layered product, the steps of which are as follows:

[0068] (1) Provide a substrate layer 101

[0069] A substrate layer 101 with a thickness of 200 μm was prepared by casting and biaxial stretching of polyethylene terephthalate.

[0070] (2) Forming a pre-coating 102

[0071] The coating solution is applied to the substrate layer 101 and dried at 150°C for 5 minutes to form a pre-coating layer 102 with a thickness of 15 μm. The coating solution includes: 50 parts of acrylic resin (tris(propylene glycol) diacrylate), 25 parts of organic solvent (ethyl acetate), 8 parts of dispersant (BYK-156), 8 parts of second leveling agent (BYK370), and 15 parts of co-crosslinking agent (trimethylolpropane trimethacrylate).

[0072] (3) Formation of prism structure layer 103

[0073] A UV-curable resin adhesive is applied to the pre-coated surface 102, and then a transfer mold with a prism microstructure is used to imprint the coated resin layer. The raised parts of the mold form corresponding depressions on the resin layer, thus forming a prism structure. The imprinting process typically requires precise control of pressure and temperature to ensure the uniformity and stability of the structure. After imprinting, the resin layer is UV-cured at an intensity of 300 mJ / cm². 2 The irradiation time is 10s, forming a triangular structure 1031 and a semi-circular structure 1032.

[0074] The UV-curable resin adhesive comprises, by weight, 45 parts of base resin (tris(propylene glycol) diacrylate), 5 parts of photoinitiator (4,6-trimethylbenzoyldiphenylphosphine oxide), 45 parts of diluent (ethyl acetate), and 5 parts of first leveling agent (BYK350). The resulting triangular structure 1031 is an isosceles triangle with a base length of 20 μm, a height of 10 μm, and a vertex angle of 90°; the resulting semi-circular structure 1032 has a radius of 5 μm.

[0075] (4) Formation of adhesive layer 104

[0076] 20 kg of EVA particles (from Lianhong New Material Technology Co., Ltd.) were preheated at 50°C for 2 hours. 1 g of inorganic phosphor (aluminate type phosphor) and 1000 g of EVA additive formulation solution were mixed to obtain an inorganic phosphor solution. This solution was sprayed onto the preheated EVA particles through a nozzle, and stirring was continued to ensure uniform mixing of the inorganic phosphor solution and EVA particles. The mixture was then melt-cast into a film using an extruder and immediately adhered to the prism structure layer 103. The EVA additives included: 40 parts initiator (2-ethylhexyl carbonate tert-amyl peroxide), 20 parts crosslinking agent (tracene propyl isocyanurate), and 20 parts coupling agent (3-methacryloyloxypropyltrimethoxysilane). Low-dose UV irradiation was then performed, with the irradiation intensity controlled at 400 mJ / cm². 2 The irradiation time was 5 seconds. The adhesive layer thickness was 80 μm. Then, nanoimprinting was performed on the surface of the adhesive layer 104 to form a nanopillar array structure. The height of the nanopillar array structure was 150 nm, the period of the nanopillars was 200 nm, and the diameter was 100 nm. The nanopillar array was arranged in a uniform periodic pattern. Finally, a release film was applied to the surface to protect the product.

[0077] Comparative Example 1

[0078] This comparative example provides a traditional reflective film, which is made of PET material and does not contain a prism structure layer.

[0079] Comparative Example 2

[0080] The only difference from Example 1 is that the adhesive layer in step (4) is replaced by conventional pressure-sensitive adhesive instead of EVA film.

[0081] Comparative Example 3

[0082] The only difference from Example 1 is that inorganic phosphor is not added in step (4).

[0083] Comparative Example 4

[0084] The only difference from Example 1 is that the apex angle of the triangular structure 1031 formed in step (3) is 45°.

[0085] Comparative Example 5

[0086] The only difference from Example 1 is that the apex angle of the triangular structure 1031 formed in step (3) is 60°.

[0087] Comparative Example 6

[0088] The only difference from Example 1 is that the apex angle of the triangular structure 1031 formed in step (3) is 120°.

[0089] Comparative Example 7

[0090] The only difference from Example 1 is that the adhesive layer thickness in step (4) is 50 μm.

[0091] Comparative Example 8

[0092] The only difference from Example 1 is that the adhesive layer thickness in step (4) is 100 μm.

[0093] Comparative Example 9

[0094] The only difference from Example 1 is that the adhesive layer thickness in step (4) is 150 μm.

[0095] Comparative Example 10

[0096] The only difference from Example 1 is that the amount of inorganic phosphor added in step (4) is halved.

[0097] Experimental Example 1

[0098] The reflectivity, peel strength, and luminance of the brightness-enhancing reflective films obtained in Example 1 and Comparative Examples 1-10 are shown in Table 1.

[0099] Reflectivity test conditions: Under standard light source (D65 light source, brightness of 1000 cd / m²) 2 The reflectivity of reflective film samples at angles of 45°, 60°, 90° and 120° were tested respectively.

[0100] Peel strength test conditions: universal tensile testing machine tensile speed 300mm / min, strip width 1cm.

[0101] Brightness test conditions: Comparative Example 1 was used as the control sample.

[0102] Table 1. Reflectivity, peel strength, and luminance of the brightness-enhancing reflective films obtained in the examples and comparative examples.

[0103]

[0104] Performance Analysis: The angle of the prism structure determines the reflection path of light in the reflective film. Experimental results show that the 90° prism structure has the highest reflectivity. The design of the 90° prism structure makes the light more concentrated during reflection, reducing light scattering loss and thus improving reflectivity and brightness. Smaller prism angles (45°, 60°) may result in greater deflection of the light reflection path, increasing light loss in the PET substrate; while a larger angle (120°), although reducing deflection, weakens the concentrated reflection effect of light.

[0105] Experimental results show that the thickness of the adhesive layer is positively correlated with peel strength and luminance, but increasing the thickness leads to a decrease in reflectivity and an increase in cost. Therefore, the adhesive layer should be selected with an appropriate thickness to maintain high reflectivity while ensuring good adhesive strength and luminance. Furthermore, compared to traditional adhesives, the peel strength is improved by approximately 50%; compared to adhesives without a nanopillar array structure, the peel strength is improved by approximately 25%; and the addition of phosphor significantly improves luminance.

[0106] Compared to traditional reflective films (which do not employ a prism structure design), the reflective film of this invention improves reflectivity by approximately 1% to 2% in the visible light range. By optimizing the angle of the prism structure, embodiments of this invention further enhance reflectivity, reducing reliance on high-reflectivity metallic materials (such as aluminum or silver) and significantly lowering material costs.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lustrous reflective film in the form of a laminate product, characterized in that, The base material layer, the pre-coating layer, the prism structure layer and the bonding layer are sequentially arranged; The pre-coating layer contains an organic adhesive; The prism structure layer includes triangular structures and semi-circular structures, and the triangular structures and the semi-circular structures are alternately arranged; The base of the triangular structure is attached to the pre-coating layer, and the triangular structure extends from one end of the pre-coating layer to the opposite end; The base of the semi-circular structure is attached to the pre-coating layer, and the semi-circular structure extends from one end of the pre-coating layer to the opposite end; The triangular structure is an isosceles triangle, the base length is 10-20 μm, the height is 10-20 μm, the top angle of the triangular structure is 85-95°, and the radius of the semi-circular structure is 5-10 μm; The thickness of the bonding layer is 50-100 μm, the main material of the bonding layer is ethylene-vinyl acetate copolymer or polyolefin elastomer, the bonding layer contains inorganic fluorescent powder, and the mass fraction of the inorganic fluorescent powder in the bonding layer formula solution is 0.1-0.5%.

2. The lamination product form of a brightness enhancement film according to claim 1, characterized in that, The triangular structure and the semi-circular structure are formed by UV curing resin glue transfer printing, and the UV curing resin glue includes, by mass fraction, 40-50 parts of base resin, 1-5 parts of photoinitiator, 40-50 parts of diluent and 1-5 parts of first leveling agent; The base resin is selected from at least one of bisphenol F type epoxy resin, epoxy acrylate resin, resorcinol type epoxy resin and bisphenol F / A blended type epoxy resin; The photoinitiator is selected from at least one of 4,6-trimethylbenzoyl diphenyl phosphine oxide and 1-hydroxycyclohexyl phenyl ketone; The diluent is selected from at least one of ethyl acetate, propylene glycol methyl ether acetate, acetone and butanone; The first leveling agent is selected from at least one of polyether modified siloxane and polyacrylate.

3. The lamination product form of a glar reflective film according to claim 1, characterized by, The coating liquid for forming the pre-coating layer includes, by mass fraction, 40-60 parts of acrylate resin, 20-30 parts of organic solvent, 5-10 parts of dispersant, 5-10 parts of second leveling agent and 10-20 parts of auxiliary crosslinking agent; The dispersant is selected from at least one of anionic polyacrylate dispersant and modified polyacrylate dispersant; The second leveling agent is selected from at least one of polyether modified siloxane and polyacrylate; The auxiliary crosslinking agent is selected from at least one of triallyl isocyanurate, trimethylolpropane trimethylacrylate and N,N-methylene bisacrylamide.

4. The lamination product form of a brightness enhancing reflector film according to claim 1 or 3, characterized in that, The thickness of the pre-coating layer is 10-20 μm; The thickness of the base material layer is 100-200 μm; The material of the base material layer is selected from at least one of polyethylene, polypropylene, polycarbonate, polyhexamethylene adipate, polyethylene terephthalate, polyvinylidene fluoride and polybutylene terephthalate.

5. The lamination product form of a glar reflective film according to claim 1, wherein The light transmittance of the bonding layer is greater than 93%.

6. The lamination product form of a glar reflective film according to claim 1, wherein The surface of the adhesive layer is provided with a nano-pillar array structure, the height of the nano-pillar array structure is 100-150 nm, the interval between two adjacent nano-pillars is 200-300 nm, and the diameter of the nano-pillar is 50-150 nm.

7. The lamination product form of a glar reflective film according to claim 1, wherein The adhesive layer formula solution comprises 30-40 parts of initiator, 15-20 parts of crosslinking agent and 15-20 parts of coupling agent, the initiator is tert-amyl peroxy-2-ethylhexyl carbonate, the crosslinking agent is triallyl isocyanurate, and the coupling agent is 3-methacryloyloxypropyl trimethoxysilane.

8. A method of producing the lamination product form of the brightness enhancement film as claimed in any one of claims 1 to 7, characterized by, The method comprises the following steps: The pre-coating layer, the prism structure layer and the adhesive layer are sequentially prepared on the substrate layer.

9. The production method according to claim 8, characterized by, The method comprises the following steps: The coating liquid for forming the pre-coating layer is coated on the substrate layer, and the pre-coating layer is formed after drying; The UV curing resin glue is coated on the surface of the pre-coating layer, and then the coated resin layer is imprinted by using the transfer mold with the triangular structure and the semicircular structure, the convex part of the mold forms the corresponding concave part on the resin layer, thereby forming the prism structure; The monomer particles are preheated, mixed with the formula solution added with inorganic fluorescent powder, uniformly mixed by using a stirred tank, the mixed particles are extruded and showered on the prism structure layer, and then the UV irradiation and nano-imprinting are performed, thereby forming the adhesive layer.

10. An LCD display, characterized by The backlight module comprises the brightness enhancement film in the form of the layered product according to any one of claims 1-7 or the brightness enhancement film in the form of the layered product prepared by the preparation method according to any one of claims 8-9.

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