Anti-glare, high-coverage and improved visual color difference LED display module packaging film

Abstract

The application discloses an LED display module packaging film material capable of preventing glare, high covering and improving visual color difference, which comprises a black EVA adhesive film layer, a PET film material layer arranged on the top of the black EVA adhesive film layer, and a PET base material layer, an AG layer outer layer arranged on the top of the PET base material layer and a flexographic printing layer inner layer arranged on the bottom of the PET base material layer, wherein the flexographic printing layer inner layer is arranged on the top of the black EVA adhesive film layer; the black EVA adhesive film layer comprises the following raw materials in parts by weight: EVA 85-90 parts, light shielding agent 10 parts, carbon black 0.08% parts and additives 2-5 parts, wherein the additives comprise the following raw materials in parts by weight: crosslinking aid 0.5-1 part, photoinitiator 0.5-5 parts and antioxidant 0.01-0.05 part; the LED display module packaging film material is attached to the surface of an LED screen and has the functions of preventing glare, high covering and improving visual color difference, so that the color difference of the LED screen is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of LED encapsulation film technology, and in particular to an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference. Background Technology

[0002] An LED screen is an electronic display screen that displays information by controlling semiconductor light-emitting diodes. During manufacturing, LED screens must meet certain color difference optical index tests before they can leave the factory. These color difference optical index tests mainly measure three optical parameters of the LED screen: L (brightness), a (red-green hue), and b (yellow-blue hue).

[0003] Currently, the color difference index of a single LED screen is relatively easy to meet the requirements for production and use. However, in some large-scale commercial performances or exhibitions, large-size LED screens are required for viewing and display. In such cases, due to the limitations of LED screen manufacturing processes and costs, it is not possible to manufacture large-size LED screens at once. Therefore, based on the actual needs of the viewing area at the site or scene, multiple LED screens need to be temporarily assembled together to form a large-size LED screen for display.

[0004] However, when multiple LED screens are assembled into a large-size LED screen for display, the following defects may occur: there are differences in the base color between the multiple LED screens, which can easily lead to uneven color in the assembled large-size LED screen, and there are certain colors between multiple LED screens, which greatly affects the user's viewing experience.

[0005] Currently, there is no good method to eliminate color difference in large-size LED screens, nor is there any relevant LED display module encapsulation film material that can effectively solve this problem. Therefore, there is an urgent need in the market for an LED display module encapsulation film material that can reduce color difference in large-size LED screens. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an LED display module encapsulation film material that is anti-glare, has high opacity, and improves visual color difference, effectively reducing the color difference of the LED screen, effectively improving the uniformity of LED screen light emission, and also has the advantages of anti-glare and high opacity.

[0007] To achieve the above objectives, the present invention provides an LED display module encapsulation film material with anti-glare, high opacity, and improved visual color difference, comprising a black EVA film layer, a PET film layer on top of the black EVA film layer, the PET film layer comprising a PET substrate layer, an outer AG layer disposed on top of the PET substrate layer, and an inner flexible printing layer disposed at the bottom of the PET substrate layer, the inner flexible printing layer being disposed on top of the black EVA film layer; the black EVA film layer comprises the following raw materials in parts by weight: EVA: 85-90 parts, opacifier: 10 parts, carbon black: 0.08 parts, and additives: 2-5 parts, the additives comprising the following raw materials in parts by weight: crosslinking aid: 0.5-1 parts, photoinitiator: 0.5-5 parts, antioxidant: 0.01-0.05 parts.

[0008] Preferably, the outer layer of the AG layer is an acrylic varnish resin material layer.

[0009] Preferably, the thickness of the PET substrate layer is in the range of 100-125 μm.

[0010] Preferably, the inner layer of the flexographic printing layer is a black ink layer.

[0011] Preferably, the thickness of the inner layer of the flexographic printing layer ranges from 1.8 μm to 2.5 μm.

[0012] Preferably, the EVA is a copolymer of ethylene and vinyl acetate with a vinyl acetate content of 25%-35% and an MI value of 25-35 g / 10 min.

[0013] Preferably, the light-blocking agent includes one or a mixture of several of the following: polymethyl methacrylate microspheres, polyethylene microspheres, talc, calcium carbonate, diatomaceous earth, and silica.

[0014] Preferably, the carbon black is carbon black particles with a diameter range of 1μm-10μm that have been modified with a silane coupling agent.

[0015] Preferably, the crosslinking agent in the additive includes one or a mixture of several of the following: triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, and diethylene glycol dimethacrylate; the photoinitiator in the additive includes: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoyl phenylphosphonate, and 2-dimethylamino-2-benzyl-1-[4-(4-morpholino] The adjuvant contains one or a mixture of several of the following: 1-butanone, 2-methyl-2-(4-morpholino)-1-[4-(methylthio)phenyl]-1-propanone, and 2-hydroxy-2-methyl-1-(4-hydroxyethoxy); the antioxidant in the adjuvant includes a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol ester; and the secondary antioxidant is one or a mixture of two of the following: tris(4-nonylphenol) phosphite or tris(2,4-di-tert-butylphenyl) phosphite.

[0016] Preferably, the surface of the opaque agent is coated with organic matter and processed into a 10% concentration EVA masterbatch before use; the surface of the carbon black is coated with organic matter and processed into a 1% concentration EVA masterbatch before use; the thickness of the black EVA film layer ranges from 150 to 180 μm; and the transmittance of the black EVA film layer ranges from 70 to 72%.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention includes a PET film layer, which comprises a PET substrate layer, an outer AG layer disposed on top of the PET substrate layer, and an inner flexographic printing layer disposed at the bottom of the PET substrate layer.

[0019] The outer AG layer serves to prevent glare and reduce surface reflection, while the inner flexographic layer is a black ink layer that reduces color differences between boards, preserving the visual effect when LED screens are spliced ​​together. The PET base layer provides a certain mechanical structure, ensuring the stability and uniformity of the outer AG layer and the inner flexographic layer.

[0020] At the same time, the inner layer of the flexographic printing layer is coordinated with the black EVA film layer to effectively improve the concealing ability.

[0021] 2. The present invention includes a black EVA film layer with an appropriate amount of carbon black added. While ensuring that the black EVA film layer is not easy to peel off, not easy to age, and does not affect the light emission of the LED screen, it effectively improves the concealing ability of the LED screen and can also reduce the glare and color difference of the LED screen.

[0022] 3. In summary, the present invention provides an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference. This LED display module encapsulation film material is used to adhere to the surface of an LED screen, and it plays a role in anti-glare, high opacity, and improved visual color difference, thereby greatly reducing the color difference performance of the LED screen. Finally, after multiple LED screens are assembled together and adhered with the LED display module encapsulation film material of the present invention, they have good performance with small color difference, which greatly improves the visual uniformity, performance, and user experience of large-size LED screens. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference, as provided in Embodiment 1.

[0025] Figure 2 This is an example of the appearance effect of an LED screen (multiple LED screens spliced ​​together) provided in the prior art of Embodiment 4, which has been covered with a common EVA film layer of Example 4 in Embodiment 3;

[0026] Figure 3 The image shown is an illustration of the appearance of an LED display module encapsulation film material with anti-glare, high opacity, and improved visual color difference provided in Embodiment 1 of the present invention, which is a prior art LED screen (multiple LED screens spliced ​​together) provided in Embodiment 4.

[0027] The diagram includes:

[0028] 1. PET film layer; 11. AG outer layer; 12. PET substrate layer; 13. Flexographic printing inner layer; 2. Black EVA film layer. Detailed Implementation

[0029] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] Please see Figure 1 Embodiment 1 of the present invention discloses a technical solution for the structural composition of an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference.

[0032] This is an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference. It includes a black EVA film layer 2, with a PET film layer 1 on top of the black EVA film layer 2. The PET film layer 1 includes a PET substrate layer 12, an outer AG layer 11 on top of the PET substrate layer 12, and a flexible printing layer inner layer 13 at the bottom of the PET substrate layer 12. The flexible printing layer inner layer 13 is located on top of the black EVA film layer 2. The black EVA film layer 2 comprises the following raw materials in parts by weight: EVA: 85-90 parts, opacifier: 10 parts, carbon black: 0.08 parts, and additives: 2-5 parts. The additives include the following raw materials in parts by weight: crosslinking aid: 0.5-1 parts, photoinitiator: 0.5-5 parts, and antioxidant: 0.01-0.05 parts.

[0033] The outermost layer 11 of the AG layer is an acrylic varnish resin material layer. The AG in the outermost layer 11 of the AG layer stands for Anti-Glare.

[0034] The thickness of the PET substrate layer 12 ranges from 100 to 125 μm. The purpose of setting the thickness of the PET substrate layer 12 within this range of 100-125 μm is to ensure that it provides sufficient support strength and toughness to the PET film layer 1, thereby ensuring that the outer AG layer 11 and the inner flexographic layer 13 can be uniformly coated on the upper and lower surfaces of the PET substrate layer 12. In addition, it ensures good light transmittance and avoids affecting the anti-glare properties of the outer AG layer 11 and the color difference reduction properties of the inner flexographic layer 13.

[0035] The inner layer 13 of the flexographic printing layer is a black ink layer.

[0036] The thickness of the inner 1322 flexographic layer ranges from 1.8 to 2.5 μm.

[0037] EVA is a copolymer of ethylene and vinyl acetate with a vinyl acetate content of 25%-35% and an MI value of 25-35 g / 10 min.

[0038] The light-blocking agents include one or a mixture of several of the following: polymethyl methacrylate microspheres, polyethylene microspheres, talc, calcium carbonate, diatomaceous earth, and silica.

[0039] Carbon black is carbon black particles with a diameter range of 1μm-10μm that have been modified with a silane coupling agent.

[0040] The crosslinking agents in the additives include one or a mixture of several of the following: triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, and diethylene glycol dimethacrylate; the photoinitiators in the additives include: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoyl phenylphosphonate, and 2-dimethylamino-2-benzyl-1-[4-4] One or a mixture of several of the following: [-morpholinylphenyl]-1-butanone, 2-methyl-2-4-morpholinyl-1-[4-methylthiophenyl]-1-propanone, and 2-hydroxy-2-methyl-1-4-hydroxyethoxy; the antioxidants in the adjuvant include primary antioxidants and secondary antioxidants, wherein the primary antioxidant is octadecyl 3-3,5-di-tert-butyl-4-hydroxyphenyl propionate octadecyl alcohol ester; and the secondary antioxidant is one or a mixture of two of the following: tris-4-nonylphenol phosphite or tris-2,4-di-tert-butylphenyl phosphite.

[0041] The surface of the opaque agent is coated with organic matter and processed into a 10% concentration EVA masterbatch before use. The surface of the carbon black is coated with organic matter and processed into a 1% concentration EVA masterbatch before use. The thickness of the black EVA film layer 2 ranges from 150 to 180 μm, and the transmittance of the black EVA film layer 2 ranges from 70 to 72%.

[0042] Furthermore, the upper and lower surfaces of the black EVA film layer 2 are also coated with a polyethylene terephthalate and polyethylene protective film, or a polyethylene and polyethylene protective film.

[0043] The transmittance of the aforementioned black EVA film layer 2 ranges from 70-72%. It has the advantages of being difficult to peel off, not easy to age, having a certain ability to cover LED screens, and not affecting the light emission of LED screens.

[0044] Embodiment 1 of the present invention discloses an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference, the advantages of which are:

[0045] The present invention includes a PET film layer 1, which comprises a PET substrate layer 12, an outer AG layer 11 disposed on top of the PET substrate layer 12, and an inner flexographic layer 13 disposed at the bottom of the PET substrate layer 12.

[0046] The outer AG layer 11 serves to prevent glare and reduce surface reflection. The inner flexographic layer 13 is a black ink layer, which reduces color differences between boards and preserves the visual effect when LED screens are spliced ​​together. The PET base layer provides a certain mechanical structure, ensuring the stability and uniformity of the outer AG layer 11 and the inner flexographic layer 13.

[0047] Meanwhile, the black EVA film layer 2 has a light transmittance of 70-72%, which provides a certain level of concealing ability. Furthermore, the inner layer 13 of the soft printing layer coordinates with the black EVA film layer 2 to effectively enhance the concealing ability.

[0048] Therefore, after this anti-glare, high-coverage, and color-difference-improving LED display module encapsulation film is bonded to the LED screen, it can greatly reduce the color difference of the LED screen. Ultimately, it can effectively reduce the color difference of large-size LED screens assembled from multiple LED screens, presenting customers with better visual uniformity, better visual performance, and smaller color difference of large-size LED screens.

[0049] In addition, such as Figure 1 As shown in Embodiment 1 of the present invention, an LED display module encapsulation film material with anti-glare, high opacity, and improved visual color difference is disclosed after manufacturing. The PET film layer 1 has a first pressure-sensitive adhesive protective film layer on top, and the black EVA film layer 2 has an electrostatic protective film layer (not shown in the figures) or a second pressure-sensitive adhesive protective film layer on the bottom. The first pressure-sensitive adhesive protective film layer and the electrostatic protective film layer (not shown in the figures) or the second pressure-sensitive adhesive protective film layer are used to protect the LED display module encapsulation film material. When it is necessary to attach the LED display module encapsulation film material to the LED screen, the first pressure-sensitive adhesive protective film layer and the electrostatic protective film layer (not shown in the figures) or the second pressure-sensitive adhesive protective film layer are peeled off for use.

[0050] Example 2:

[0051] Embodiment 2 of the present invention provides a method for preparing a black EVA film layer 2 and a method for preparing an LED display module encapsulation film material that is anti-glare, has high opacity, and improves visual color difference.

[0052] First, a method for preparing a black EVA film layer 2 includes the following process steps:

[0053] Step S1: Mix the raw materials according to the weight ratio of EVA, opacifier, carbon black, additives and organic solvent of the black EVA film layer 2 in Example 1 above;

[0054] Step S2: Add the mixture from step S1 into the hopper of a single-screw extruder, melt and mix it through the single-screw extruder, and extrude it through the die of the single-screw extruder. The temperature range of each section of the die is 75℃-90℃.

[0055] Step S3: After extrusion by a single screw extruder, the lower protective film (which is a polyethylene terephthalate protective film, a polyethylene protective film, a polyethylene terephthalate protective film, a polyethylene terephthalate protective film, or a polyethylene protective film) and the black EVA film layer 2 are pressed together by a hot press, and the surface of the lower protective film is textured by an embossing machine;

[0056] Step S4: Press and cool the black EVA film layer 2 after step S3 using a casting roller;

[0057] Step S5: Then, use a hot press to press the upper protective film (the upper protective film is polyethylene terephthalate protective film, polyethylene protective film, polyethylene terephthalate protective film, polyethylene terephthalate protective film or polyethylene protective film) together with the black EVA film layer 2 treated in step S4.

[0058] Step S6: Trim the black EVA film layer 2 after step S5 using an edge trimming machine;

[0059] Step S7: Rewind the material using a winding machine;

[0060] Step S8: Remove from the rewinder and package.

[0061] Second, a method for preparing an LED display module encapsulation film material that provides anti-glare, high opacity, and improved visual color difference includes the following process steps:

[0062] Step S1: Prepare a PET film layer 1, which includes the following steps:

[0063] Step S11: Prepare a PET substrate layer 12 with a certain thickness and based on PET material;

[0064] Step S12: Apply acrylic varnish resin material to the top of PET substrate layer 12 to form AG outer layer 11. Specifically, the acrylic varnish resin material is uniformly applied to the top of PET substrate layer 12 by a roller coater, and UV curing is used to fully cure the acrylic varnish resin material on PET substrate layer 12. During the curing process, the texture on the roller coater will be transferred to the acrylic varnish resin layer, thereby forming AG outer layer 11 with anti-glare effect.

[0065] Step S13: Apply black ink to the bottom of the PET substrate layer 12 to form an inner flexographic printing layer. Specifically, use a flexographic printing machine to evenly apply black ink to the bottom of the PET substrate layer 12, and use UV curing to cure the black ink on the PET substrate layer 12, thereby forming the inner flexographic printing layer 13.

[0066] Step S2: Prepare a black EVA film layer 2 as described above. Deposit the PET film layer 1 from step S1 onto the black EVA film layer 2. That is, the inner layer 13 of the flexographic printing layer 1 of the PET film layer 1 is deposited onto the black EVA film layer 2 by hot pressing, bonding or other processing methods, or the PET film layer 1 and the black EVA film layer 2 are laminated by a laminating machine to form an LED display module encapsulation film material with anti-glare, high opacity and improved visual color difference.

[0067] Example 3:

[0068] Embodiment 3 of the present invention provides experimental data comparing the tensile strength, aging, light transmittance, and LED screen luminescence of a series of carbon black addition ratios in a black EVA film layer 2 with those of a regular EVA film layer without added carbon black.

[0069] This experiment used four examples, and the formulas for examples one through four are shown in Table 1 below:

[0070]

[0071] According to Table 1, Example 1 is a black EVA film layer 2 with 0.5 parts of carbon black added.

[0072] According to Table 1, Example 2 is a black EVA film layer 2 with 0.1 parts of carbon black added.

[0073] According to Table 1, Example 3 is a black EVA film layer 2 with 0.08 parts of carbon black added.

[0074] According to Table 1, Example 4 is a common EVA film layer without the addition of carbon black.

[0075] Examples 1 to 4 in Table 1 were all prepared according to the preparation method of Example 2 described above.

[0076] Then, the sample films of Examples 1 to 4 were tested for tensile strength, aging, light transmittance, and LED screen luminescence, respectively. The experimental data are shown in Table 2 below:

[0077]

[0078] Based on Table 2, the following experimental analysis conclusions can be drawn:

[0079] 1. The first row of Table 2 lists the four tests conducted on Examples 1 to 4 of Table 1 above: tensile strength, aging, light transmittance, and light emission of the LED screen.

[0080] 2. The second row of Table 2: The second row shows the tensile tests performed on Examples 1 to 4 of Table 1 above. This tensile test item indicates that:

[0081] Example 4 shows a common EVA film layer that, without the addition of carbon black, requires a large tensile force to tear from an LED screen, yet it maintains good peel strength.

[0082] In Example 3, a black EVA film layer 2, when the carbon black ratio is 0.08 parts, although the peel strength is 6.7% lower, still maintains good peel strength, still meets the peel strength usage standard for LED screens, and is still difficult to tear from the LED screen;

[0083] In Example 2, when the carbon black content reaches 0.1 parts, the peel strength of the black EVA film layer 2 decreases significantly by 35%. Its peel strength is low and does not meet the peel strength standard for LED screens (low peel strength easily leads to easy tearing, easy deformation, weak resistance to external forces, and easily affects service life or performance).

[0084] In Example 1, a black EVA film layer 2, when the carbon black content is higher than 0.1 parts, has a peel strength that is roughly the same as when the carbon black content is 0.1 parts. Similarly, it cannot meet the peel strength standard for LED screens.

[0085] 2. Rows 3 and 4 of Table 2: Rows 3 and 4 describe the aging tests performed on Examples 1 to 4 of Table 1 above. These aging test items indicate that:

[0086] Example 4 shows a common EVA film layer that, without the addition of carbon black, can maintain a clean surface in both the double 85 aging test environment and the 110°C high temperature and 100°C high humidity aging test environment.

[0087] Example 3 shows a black EVA film layer 2. When the carbon black ratio is 0.08 parts, the surface remains intact in both the double 85 aging test environment and the 110 high temperature and 100 high humidity aging test environment.

[0088] In Example 2, a black EVA film layer 2, when the carbon black ratio reaches 0.1 parts, blistered on the surface in the double 85 aging test environment and the 110 high temperature and 100 high humidity aging test environment, and failed the aging test.

[0089] In Example 1, a black EVA film layer 2, when the carbon black content is higher than 0.1 parts, blistered on the surface in the double 85 aging test environment and the 110 high temperature and 100 high humidity aging test environment, and failed the aging test.

[0090] (The reason why Examples 2 and 1 failed the aging test is that when the carbon black ratio reaches 0.1 parts or even higher, the carbon black has poor cross-linking curing properties and poor water vapor barrier performance on the black EVA film layer 2.)

[0091] 3. The fifth row of Table 2: The fifth row consists of light transmittance tests (light blocking tests) conducted on Examples 1 to 4 of Table 1 above. This light transmittance test item indicates that:

[0092] Example 4 shows a common EVA film layer that, without the addition of carbon black, has good light transmittance but poor opacity.

[0093] Example 3 shows a black EVA film layer 2. When the carbon black ratio is 0.08 parts, it effectively reduces the light transmittance by 15% and has a significant concealing effect.

[0094] In Example 2, a black EVA film layer 2, when the carbon black ratio reaches 0.1 parts, has a lower light transmittance than in Example 3, resulting in better concealing effect.

[0095] In Example 1, a black EVA film layer 2, when the carbon black content is higher than 0.1 parts, has a lower light transmittance than in Example 3, resulting in better concealing effect.

[0096] 4. The sixth and fifth rows of Table 2 are all LED screen light emission tests conducted on Examples 1 to 4 of Table 1 above. These LED screen light emission test items indicate that:

[0097] Example 4 is a common EVA film layer. Because no carbon black is added, its light transmittance is good and it has little impact on the light emission of the LED screen. The measured white light intensity of the LED screen is 1384 cd / m^2.

[0098] In Example 3, a black EVA film layer 2, when the carbon black ratio is 0.08 parts, has a white light intensity approximately equal to the baseline value of Example 4, and it has little impact on the light emission of the LED screen.

[0099] In Example 2, a black EVA film layer 2, when the carbon black ratio reaches 0.1 parts, has a white light intensity that is 40 cd / m^2 lower than the baseline value in Example 4, which has a slight impact on the light emission of the LED screen.

[0100] In Example 1, a black EVA film layer 2, when the carbon black content is higher than 0.1 parts, has a white light intensity that is 95 cd / m^2 lower than the baseline value in Example 4, which has a significant impact on the light emission of the LED screen.

[0101] In summary, based on the experimental analysis conclusions in sections 1-4 above, we can conclude that:

[0102] 1. If no carbon black is added, the ordinary EVA film layer can ensure good peel strength, good aging resistance and no impact on LED screen light emission, but poor concealing performance.

[0103] 2. If the amount of carbon black added reaches 0.1 parts or even exceeds 0.1 parts, the peel strength of the black EVA film layer 2 will be very poor, the anti-aging performance will be very poor, and it will affect the light emission of the LED screen, but it will have good concealing performance.

[0104] 3. If the carbon black content reaches 0.08 parts, the black EVA film layer 2 can combine the advantages of 1 and 2 above (while eliminating the disadvantages of 1 and 2), and has better peel strength, anti-aging performance, concealing performance and does not affect the light emission of the LED screen.

[0105] Therefore, the transmittance of the black EVA film layer 2 of the present invention is in the range of 70-72%, and it has the advantages of being difficult to peel off, not easy to age, having a certain ability to cover LED screens, and not affecting the light emission of LED screens.

[0106] Example 4:

[0107] Example 4 provides experimental data and effect comparison diagrams of an LED screen (composed of multiple LED screens assembled together) with an ordinary EVA film layer of Example 4 of Example 3, and an LED screen (composed of multiple LED screens assembled together) with an LED display module encapsulation film material of the present invention that provides anti-glare, high coverage and improved visual color difference.

[0108] like Figure 2 As shown, the Figure 2 The image shows the appearance of an LED screen (composed of multiple LED screens assembled together) with a common EVA film layer of Example 4 from Embodiment 3. The color difference experimental data of this LED screen measured by a colorimeter are shown in Table 3 below:

[0109]

[0110]

[0111] like Figure 3 As shown, the Figure 3 The image shows the appearance effect of an LED screen (composed of multiple LED screens assembled together) with an LED display module encapsulation film material for anti-glare, high opacity, and improved visual color difference provided in Embodiment 1 of the present invention. The color difference experimental data of this LED screen using the LED display module encapsulation film material of the present invention, measured by a colorimeter, are shown in Table 4 below.

[0112]

[0113]

[0114] First, the experimental data sampling method for Tables 3 and 4 above is as follows: Several LED screens of the same specification are selected and divided into two groups. These two groups are assembled into two large-sized LED screens. A common EVA film layer and an LED display module encapsulation film material of the present invention that provides anti-glare, high coverage, and improved visual color difference are respectively applied to these two LED screens. Then, the positions of 10 LED screens are randomly and evenly selected from each of the two LED screens for measurement. These 10 LED screens correspond to number boards 1 to 10 respectively. Then, the color difference meter data are measured at the top, bottom, center, left, and right positions of these 10 LED screens, thereby forming the experimental data in Tables 3 and 4 above.

[0115] Secondly, the experimental data in Tables 3 and 4 are analyzed as follows:

[0116] 1. An LED screen (composed of multiple LED screens assembled together) is covered with a common EVA film layer. The variance of the L value (brightness value) of the color difference values ​​of each assembled LED screen (the degree of closeness to the average value; the smaller the variance, the more evenly distributed the data) ranges from 0.0017 to 0.54, the variance of the A value (red-green hue) ranges from 0.001 to 0.04, and the variance of the B value (yellow-blue hue) ranges from 0.002 to 0.2.

[0117] 2. The LED screen (composed of multiple LED screens assembled together) is covered with the LED display module encapsulation film of the present invention. The L value of the color difference of each assembled LED screen is between 0.003 and 0.02, the variance of the A value is between 0.0001 and 0.005, and the variance of the B value is between 0.0007 and 0.007.

[0118] 3. By comparing the data in points 1 and 2 above, it can be shown that:

[0119] Table 3: For LED screens with a common EVA film layer, the color difference values ​​(L value, A value, and B value) of each board are large, and each board has a certain color difference. Obviously, when the 10 boards are combined together, the overall variance is even greater and the color difference is more obvious.

[0120] Table 4: For LED display module encapsulation film of the present invention, the variance of color difference values ​​(L value, A value and B value) of each board between LED screen board 1 and board 10 is reduced, the color difference of each board itself is reduced, and it can be clearly seen from Table 4 that the color difference values ​​of each board tend to be consistent. After combining the 10 boards together, this is more conducive to eliminating the overall color difference and making the overall color difference smaller.

[0121] In conclusion, based on the above analysis, if an LED screen (composed of multiple LED screens assembled together) is covered with an LED display module encapsulation film material of the present invention that provides anti-glare, high coverage, and improved visual color difference, the color difference will be greatly reduced. This significantly improves the visual uniformity, performance, and user experience of large-size LED screens.

[0122] Example 5:

[0123] The technical solution of the LED display module encapsulation film material with anti-glare, high opacity, and improved visual color difference in Embodiment 1 includes the following:

[0124] The PET substrate in PET substrate layer 12 is model GFT05C-24, purchased from Tianjin Wanhua Co., Ltd.

[0125] The raw materials for the acrylic varnish resin material layer of the outer layer 11 of the AG layer are not limited and can be formulated by the user.

[0126] The black ink for the inner layer 13 of the flexographic printing layer is Supercolor Ink, purchased from Supercolor Ink Industry Co., Ltd.

[0127] The EVA type of the black EVA film layer 2 is 280PV, 2825, purchased from Dow Chemical Company;

[0128] The light-blocking agent was model MX-500F, purchased from Zongyan Chemical (Suzhou) Co., Ltd.

[0129] The carbon black, model number N330, was purchased from Jinan Zhongbei Fine Chemical Co., Ltd.

[0130] The crosslinking aids (tracene propyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, and diethylene glycol dimethacrylate) in the additives were purchased from Changxing Chemical Industry (China) Co., Ltd.

[0131] The photoinitiator was of type 184, 1173, TPO-L, and was purchased from BASF AG.

[0132] Both the primary and secondary oxidants of the antioxidant were purchased from BASF AG.

[0133] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-glare, high-coverage and improved visual color difference LED display module packaging film material, characterized in that, The material includes a black EVA film layer (2), on top of which is a PET film layer (1). The PET film layer (1) includes a PET substrate layer (12), an outer AG layer (11) on top of the PET substrate layer (12), and an inner flexible printing layer (13) at the bottom of the PET substrate layer (12). The inner flexible printing layer (13) is located on top of the black EVA film layer (2). The black EVA film layer (2) includes the following raw materials in parts by weight: EVA: 85-90 parts, opacifier: 10 parts, carbon black: 0.08 parts, and additives: 2-5 parts. The additives include the following raw materials in parts by weight: crosslinking aid: 0.5-1 parts, photoinitiator: 0.5-5 parts, and antioxidant: 0.01-0.05 parts. The outer layer (11) of the AG layer is an acrylic varnish resin material layer; The inner layer (13) of the flexographic printing layer is a black ink layer. 2.The LED display module packaging film material of claim 1, wherein, The thickness of the PET substrate layer (12) ranges from 100 to 125 μm. 3.The LED display module packaging film material of claim 1, wherein, The thickness of the inner layer (13) of the flexographic printing layer ranges from 1.8 μm to 2.5 μm.

4. The LED display module encapsulation film material with anti-glare, high opacity, and improved visual color difference as described in claim 1, characterized in that, The EVA is a copolymer of ethylene and vinyl acetate with a vinyl acetate content of 25%-35% and an MI value of 25-35 g / 10 min. 5.The LED display module packaging film material of claim 1, wherein, The light-blocking agent includes one or a mixture of several of the following: polymethyl methacrylate microspheres, polyethylene microspheres, talc, calcium carbonate, diatomaceous earth, and silica. 6.The LED display module packaging film material of claim 1, wherein, The carbon black is carbon black particles with a diameter range of 1μm-10μm that have been modified with a silane coupling agent. 7.The LED display module packaging film material of claim 1, wherein, The surface of the opaque agent is coated with organic matter and processed into a 10% concentration EVA masterbatch before use. The surface of the carbon black is coated with organic matter and processed into a 1% concentration EVA masterbatch before use. The thickness of the black EVA film layer (2) ranges from 150 to 180 μm, and the transmittance of the black EVA film layer (2) ranges from 70 to 72%.

Images