LED display module packaging film material capable of preventing dazzle, achieving high coverage and improving visual chromatic aberration

Abstract

The anti-dazzle, high-covering and visual color difference improving LED display module packaging film material comprises a black EVA adhesive film layer, a PET film material layer is arranged at the top of the black EVA adhesive film layer, the PET film material layer comprises a PET base material layer, an AG layer outer layer arranged at the top of the PET base material layer and a flexographic printing layer inner layer arranged at the bottom of the PET base material layer, and the flexographic printing layer inner layer is arranged at the top of the black EVA adhesive film layer; the black EVA adhesive film layer is prepared from the following raw materials in parts by weight: 85 to 90 parts of EVA, 10 parts of an opacifying agent, 0.08 percent of carbon black and 2 to 5 parts of an auxiliary agent, and the auxiliary agent is prepared from the following raw materials in parts by weight: 0.5 to 1 part of a crosslinking auxiliary agent, 0.5 to 5 parts of a photoinitiator and 0.01 to 0.05 part of an antioxidant; according to the LED display module packaging film material capable of preventing dazzle, achieving high coverage and improving visual chromatic aberration, the LED display module packaging film material is attached to the surface of an LED screen, the effects of preventing dazzle, achieving high coverage and improving visual chromatic aberration are achieved, and therefore the chromatic aberration performance of the LED screen is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of LED packaging adhesive films, and in particular to an LED display module packaging film material with anti-glare, high covering and improved visual color difference. Background Art

[0002] LED screen is an LED electronic display screen that displays information by controlling the display mode of semiconductor light emitting diodes. When manufacturing LED screens, they need to meet certain color difference optical index tests before they can leave the factory. The color difference optical index test mainly tests the three optical parameters of LED screens, namely L (brightness), a (redness and greenness) and b (yellowness and blueness).

[0003] At present, the color difference index of a single LED screen can easily meet the requirements of production and use. However, in some large-scale commercial performances or large-scale exhibition scenes, large-size LED screens are required for exhibition display. At this time, due to the limitations of LED screen manufacturing process and manufacturing cost, it is impossible to manufacture large-size LED screens at one time. Therefore, according to the temporary needs of the exhibition area of ​​the actual 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-sized LED screen for display, the following defects are prone to occur: there are differences in the base colors between the multiple LED screens, which easily causes uneven colors in the assembled large-sized LED screens. There are certain colors between the multiple LED screens, which greatly affects the user's viewing experience.

[0005] At present, there is no better way to eliminate the color difference of large-size LED screens, and there is no related LED display module packaging film material that can effectively solve this problem. Therefore, the market is in urgent need of an LED display module packaging film material that can reduce the color difference of large-size LED screens. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide an LED display module packaging film material with anti-glare, high covering and improved visual color difference, which can effectively reduce the color difference of the LED screen, effectively improve the uniformity of the LED screen light emission, and also have the advantages of anti-glare and high covering.

[0007] To achieve the above-mentioned purpose, the present invention provides an LED display module packaging film material with anti-glare, high covering and improved visual color difference, comprising a black EVA film layer, a PET film layer is arranged on the top of the black EVA film layer, the PET film layer comprises a PET substrate layer, an AG layer outer layer arranged on the top of the PET substrate layer and a flexographic layer inner layer arranged on the bottom of the PET substrate layer, and the flexographic layer inner layer is arranged on the 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, sunscreen: 10 parts, carbon black: 0.08% and auxiliary agent 2-5 parts, and the auxiliary agent comprises the following raw materials in parts by weight: cross-linking auxiliary agent: 0.5-1 part, 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 layer is a black ink layer.

[0011] Preferably, the inner layer thickness of the flexographic layer is in the range of 1.8 μm to 2.5 μm.

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

[0013] Preferably, the sunscreen includes: one or a mixture of polymethyl methacrylate microspheres, polyethylene microspheres, talcum powder, calcium carbonate, diatomaceous earth, and silicon dioxide.

[0014] Preferably, the carbon black is carbon black particles modified with a silane coupling agent and having a diameter ranging from 1 μm to 10 μm.

[0015] Preferably, the crosslinking auxiliary agent in the auxiliary agent includes: one or a mixture of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, and diethylene glycol dimethacrylate; the photoinitiator in the auxiliary agent includes: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, ethyl 2,4,6-trimethylbenzoyl phenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)-1-yl]-phenyl] ... )phenyl]-1-butanone, 2-methyl 2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone, 2-hydroxy-2-methyl-1-(4-hydroxyethoxy) or a mixture of the two; the antioxidant in the auxiliary agent 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; the secondary antioxidant is tris(4-nonylphenol) phosphite or tris(2,4-di-tert-butylphenyl) phosphite or a mixture of the two.

[0016] Preferably, the sunscreen surface is coated with organic matter and processed into 10% concentration EVA masterbatch before use, the carbon black surface is coated with organic matter and processed into 1% concentration EVA masterbatch before use, the thickness of the black EVA film layer is in the range of 150-180 μm, and the transmittance of the black EVA film layer is in the range of 70-72%.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is provided with a PET film material layer, the PET film material layer includes a PET base material layer, an AG layer outer layer arranged on the top of the PET base material layer, and a flexographic layer inner layer arranged on the bottom of the PET base material layer.

[0019] Among them, the outer layer of the AG layer plays a role in preventing glare and reducing surface reflection. The inner layer of the flexographic layer is a black ink layer, which reduces the color difference between the boards and retains the visual effect of the LED screen when splicing. The PET base layer provides a certain mechanical structure to ensure the stability and uniformity of the outer layer of the AG layer and the inner layer of the flexographic layer.

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

[0021] 2. The present invention is provided with a black EVA film layer, to which an appropriate amount of carbon black component is added. While ensuring that the black EVA film layer is not easy to peel off, not easy to age, and has no effect on the luminescence of the LED screen, it effectively improves the concealment ability of the LED screen and can also reduce certain glare and color difference performance of the LED screen.

[0022] 3. In summary, the present invention provides an LED display module packaging film material with anti-glare, high covering and improved visual color difference. The LED display module packaging film material is used to be bonded to the surface of the LED screen, which plays the role of anti-glare, high covering 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 bonded with the LED display module packaging film material of the present invention, they have a good performance with smaller color difference, which greatly improves the visual uniformity, expressiveness and user experience of large-size LED screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of an LED display module packaging film material with anti-glare, high hiding and improved visual color difference provided in Example 1;

[0025] Figure 2 This is an appearance effect diagram of an LED screen (multiple LED screens spliced ​​together) of the prior art provided by Example 4, with a common EVA film layer of Example 4 of Example 3 attached thereto;

[0026] Figure 3 This is an appearance effect diagram of an LED screen of the prior art provided in Example 4 (multiple LED screens spliced ​​together) with an anti-glare, high-coverage and visual color difference improved LED display module packaging film material provided in Example 1 of the present invention.

[0027] Included in the figure are:

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

[0029] The technical scheme in this embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in this embodiment of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] See also Figure 1 Embodiment 1 of the present invention discloses a technical solution for the structural composition of an LED display module packaging film material with anti-glare, high hiding and improved visual color difference.

[0032] That is, the LED display module packaging film material with anti-glare, high hiding and improved visual color difference includes a black EVA film layer 2, a PET film layer 1 is arranged on the top of the black EVA film layer 2, and the PET film layer 1 includes a PET substrate layer 12, an AG layer outer layer 11 arranged on the top of the PET substrate layer 12, and a flexographic layer inner layer 13 arranged at the bottom of the PET substrate layer 12, and the flexographic layer inner layer 13 is arranged on the 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, sunscreen: 10 parts, carbon black: 0.08% parts and auxiliary agents 2-5 parts, and the auxiliary agents include the following raw materials in parts by weight: cross-linking auxiliary agent: 0.5-1 part, photoinitiator: 0.5-5 parts, antioxidant: 0.01-0.05 parts.

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

[0034] The thickness of the PET substrate layer 12 is in the range of 100-125 μm. The purpose of setting the PET substrate layer 12 in the thickness range of 100-125 μm is to ensure that the PET film layer 1 provides sufficient support strength and toughness, thereby ensuring that the AG layer outer layer 11 and the flexographic layer inner layer 13 can be evenly coated on the upper and lower surfaces of the PET substrate layer 12, and to ensure good light transmission performance, so as to avoid affecting the anti-glare performance of the AG layer outer layer 11 and the color difference reduction performance of the flexographic layer inner layer 13.

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

[0036] The thickness of the inner flexographic layer 1322 is in the range of 1.8-2.5 μm.

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

[0038] The sunscreen includes: one or a mixture of polymethyl methacrylate microspheres, polyethylene microspheres, talcum powder, calcium carbonate, diatomaceous earth, and silicon dioxide.

[0039] The carbon black is carbon black particles modified by a silane coupling agent and having a diameter ranging from 1 μm to 10 μm.

[0040] The crosslinking auxiliary agent in the auxiliary agent includes: one or a mixture of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, diethylene glycol dimethacrylate; the photoinitiator in the auxiliary agent includes: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, ethyl 2,4,6-trimethylbenzoyl phenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-4 -morpholinylphenyl]-1-butanone, 2-methyl 2-4-morpholinyl-1-[4-methylthiophenyl]-1-propanone, 2-hydroxy-2-methyl-1-4-hydroxyethoxy or a mixture of the two; the antioxidant in the auxiliary agent 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; the secondary antioxidant is tris 4-nonylphenol phosphite or tris 2,4-di-tert-butylphenyl phosphite or a mixture of the two.

[0041] The surface of the sunscreen is coated with organic matter and processed into 10% EVA masterbatch before use. The surface of the carbon black is coated with organic matter and processed into 1% EVA masterbatch before use. The thickness of the black EVA film layer 2 is in the range of 150-180μm, and the transmittance of the black EVA film layer 2 is in the range of 70-72%.

[0042] Furthermore, polyethylene terephthalate and polyethylene protective films or polyethylene terephthalate and polyethylene terephthalate protective films or polyethylene and polyethylene protective films are attached to the upper and lower surfaces of the black EVA film layer 2 .

[0043] The transmittance of the above-mentioned black EVA film layer 2 is in the range of 70-72%. It has the advantages of being not easy to peel off, not easy to age, having a certain concealing ability for the LED screen, and not affecting the luminescence of the LED screen.

[0044] Embodiment 1 of the present invention discloses an LED display module packaging film material with anti-glare, high hiding and improved visual color difference, which has the following advantages:

[0045] The present invention is provided with a PET film material layer 1, the PET film material layer 1 includes a PET base material layer 12, an AG layer outer layer 11 arranged on the top of the PET base material layer 12, and a flexographic layer inner layer 13 arranged on the bottom of the PET base material layer 12.

[0046] Among them, the outer layer 11 of the AG layer plays a role in preventing glare and reducing surface reflection. The inner layer 13 of the flexographic layer is a black ink layer, which reduces the color difference between the boards and retains the visual effect of the LED screen when splicing. The PET base layer provides a certain mechanical structure to ensure the stability and uniformity of the outer layer 11 of the AG layer and the inner layer 13 of the flexographic layer.

[0047] Meanwhile, the light transmittance of the black EVA film layer 2 is 70-72%, which has a certain concealing ability, and the coordination between the inner flexographic layer 13 and the black EVA film layer 2 can effectively improve the concealing ability.

[0048] Therefore, after this anti-glare, high-coverage and visual color difference improved LED display module packaging film material is attached to the LED screen, it can greatly reduce the color difference performance of the LED screen, and ultimately effectively reduce the color difference of the large-size LED screen assembled by multiple LED screens, presenting customers with better visual uniformity, better visual expression and smaller color difference of the large-size LED screen.

[0049] In addition, if Figure 1 As shown, Embodiment 1 of the present invention discloses an LED display module packaging film material with anti-glare, high covering and improved visual color difference. After being manufactured and shipped, the top of the PET film layer 1 is provided with a first pressure-sensitive adhesive protective film layer, and the bottom of the black EVA film layer 2 is provided with an electrostatic protective film layer (not shown in the accompanying drawings) or a second pressure-sensitive adhesive protective film layer. The first pressure-sensitive adhesive protective film layer and the electrostatic protective film layer (not shown in the accompanying drawings) or the second pressure-sensitive adhesive protective film layer are used to protect the LED display module packaging film material. When the LED display module packaging film material needs to be attached to the LED screen, at this time, the first pressure-sensitive adhesive protective film layer and the electrostatic protective film layer (not shown in the accompanying drawings) or the second pressure-sensitive adhesive protective film layer can be torn off and used.

[0050] Embodiment 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 packaging film material with anti-glare, high hiding and improved visual color difference.

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

[0053] Step S1: mixing EVA, sunscreen, carbon black, additives and organic solvent according to the raw material proportions in parts by weight of a black EVA film layer 2 of the first embodiment;

[0054] Step S2: adding the mixed material in step S1 into the hopper of a single screw extruder, performing melt mixing through the single screw extruder, and extruding through the die head of the single screw extruder, wherein each temperature section of the die head is 75° C.-90° C.;

[0055] Step S3: After extrusion by the single screw extruder, the lower protective film (the lower protective film 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: pressing and cooling the black EVA film layer 2 processed in step S3 by a casting roll;

[0057] Step S5: pressing the upper protective film (the upper protective film 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 processed in step S4 together by a hot press;

[0058] Step S6: trimming the black EVA film layer 2 processed in step S5 by a trimming machine;

[0059] Step S7: winding it by a winding machine;

[0060] Step S8: taking out from the winder and packaging.

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

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

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

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

[0065] Step S13: coating black ink on the bottom of the PET substrate layer 12 to form an inner flexographic layer. Specifically, a flexographic printing machine is used to evenly coat the black ink on the bottom of the PET substrate layer 12, and the black ink is cured on the PET substrate layer 12 by UV curing, thereby forming an inner flexographic layer 13;

[0066] Step S2: prepare a black EVA film layer 2 as described above, and arrange the PET film layer 1 of step S1 on the black EVA film layer 2, that is, the inner layer 13 of the flexographic layer of the PET film layer 1 is arranged on 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 packaging film material with anti-glare, high covering and improved visual color difference.

[0067] Embodiment three:

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

[0069] This experiment uses four examples, among which the formula table of example 1 to example 4 is as follows:

[0070]

[0071]

[0072] According to Table 1, Example 1 is a black EVA film layer 2 with 0.5% carbon black added;

[0073] According to Table 1, Example 2 is a black EVA film layer 2 with 0.1% carbon black added;

[0074] According to Table 1, Example 3 is a black EVA film layer 2 in which carbon black is added in an amount of 0.08% of the present invention;

[0075] According to Table 1, Example 4 is a common EVA film layer without adding carbon black;

[0076] Examples 1 to 4 in Table 1 were all prepared according to the preparation method of Example 2 above.

[0077] Then, the sample films of Examples 1 to 4 were tested for tension, aging, light transmittance and LED screen luminescence, and the experimental data are shown in Table 2 below:

[0078]

[0079] According to Table 2, the following experimental analysis conclusions can be obtained:

[0080] 1. The first row of Table 2: lists the four tests of tension, aging, light transmittance and LED screen luminescence for Examples 1 to 4 in Table 1 above;

[0081] 2. The second row of Table 2: The second row is a tensile test of Examples 1 to 4 in Table 1 above. The tensile test items show that:

[0082] A common EVA film layer of Example 4, when no carbon black is added, requires a large pulling force to be torn from the LED screen, and it can maintain good peeling strength;

[0083] In a black EVA film layer 2 of Example 3, when the carbon black ratio is 0.08%, although the peel strength is 6.7% lower, it still ensures good peel strength and still meets the peel strength use standard of LED screens, and is still difficult to tear from the LED screen;

[0084] In a black EVA film layer 2 of Example 2, when the carbon black ratio reaches 0.1%, the peel strength of the black EVA film layer 2 is significantly reduced by 35%, and the peel strength is low, which does not meet the peel strength use standard of the LED screen (low peel strength is easy to cause easy tearing, easy deformation, weak resistance to external force, and easy to affect the service life or performance);

[0085] For a black EVA film layer 2 of Example 1, when the carbon black ratio is higher than 0.1%, its peel strength is roughly the same as when the carbon black ratio is 0.1%. Similarly, it cannot meet the peel strength use standard of LED screens.

[0086] 2. The third and fourth rows of Table 2: The third and fourth rows are aging tests for Examples 1 to 4 in Table 1 above. The aging test items show that:

[0087] A common EVA film layer of Example 4, when no carbon black is added, can ensure the surface integrity in both the double 85 aging test environment and the 110 high temperature 100 high humidity aging test environment;

[0088] A black EVA film layer 2 of Example 3, when the carbon black ratio is 0.08%, can ensure the surface integrity in both the double 85 aging test environment and the 110 high temperature 100 high humidity aging test environment;

[0089] A black EVA film layer 2 of Example 2, when the carbon black ratio reaches 0.1%, bubbles appear on the surface in the double 85 aging test environment and the 110 high temperature 100 high humidity aging test environment, and fails to pass the aging test;

[0090] A black EVA film layer 2 of Example 1, when the carbon black ratio is higher than 0.1%, has surface bubbles in the double 85 aging test environment and the 110 high temperature 100 high humidity aging test environment, and fails to pass the aging test.

[0091] (The reason why Example 2 and Example 1 failed the aging test is that when the carbon black ratio reaches 0.1% or even higher, the carbon black has poor cross-linking curing property on the black EVA film layer 2 and poor water vapor barrier performance)

[0092] 3. The fifth row of Table 2: The fifth row is a light transmission test (light blocking test) of Examples 1 to 4 in Table 1 above. The light transmission test items show that:

[0093] A common EVA film layer in Example 4, when no carbon black is added, has good light transmittance but poor concealment;

[0094] A black EVA film layer 2 of Example 3, when the carbon black ratio is 0.08%, effectively reduces the light transmittance by 15%, and has a significant concealing effect;

[0095] A black EVA film layer 2 of Example 2, when the carbon black ratio reaches 0.1%, the light transmittance is further lower than that of Example 3, and the concealing effect is better;

[0096] In a black EVA film layer 2 of Example 1, when the carbon black ratio is higher than 0.1%, the light transmittance is further lower than that of Example 3, and the concealing effect is better.

[0097] 4. The sixth row of Table 2: The fifth row is the LED screen luminescence test of Examples 1 to 4 in Table 1 above. The LED screen luminescence test items show that:

[0098] An ordinary EVA film layer in Example 4 has good light transmittance because no carbon black is added, and has little effect on the light emission of the LED screen. The measured white light intensity reference value of the white light emitted by the LED screen is 1384cd / M^2;

[0099] A black EVA film layer 2 of Example 3, when the carbon black ratio is 0.08%, its white light intensity is approximately equal to the reference value of Example 4, and it has little effect on the light emission of the LED screen;

[0100] In a black EVA film layer 2 of Example 2, when the carbon black ratio reaches 0.1%, the white light intensity is 40cd / M^2 lower than the baseline value of Example 4, which has a little effect on the luminescence of the LED screen;

[0101] In a black EVA film layer 2 of Example 1, when the carbon black ratio is higher than 0.1%, the white light intensity is 95cd / M^2 lower than the baseline value of Example 4, which has a greater impact on the luminescence of the LED screen.

[0102] In summary, from the above experimental analysis conclusions of 1-4, we can know that:

[0103] 1. If no carbon black component is added, the ordinary EVA film layer can ensure good peeling strength, good aging resistance and no effect on the luminescence of the LED screen, but the concealing performance is poor.

[0104] 2. If the added carbon black component reaches 0.1% or even exceeds 0.1%, the black EVA film layer 2 has very poor peel strength, very poor anti-aging performance and has an impact on the luminescence of the LED screen, but has good concealment performance.

[0105] 3. If the added carbon black component reaches 0.08%, 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, blemish-covering performance and no effect on the luminescence of the LED screen.

[0106] Therefore, the transmittance range of the black EVA film layer 2 of the present invention is 70-72%, which has the advantages of not being easy to peel off, not being easy to age, having a certain concealment ability for the LED screen, and not affecting the luminescence of the LED screen.

[0107] Embodiment four:

[0108] Embodiment 4 provides an LED screen (assembled from multiple LED screens) adhered with an ordinary EVA film layer of Example 4 of Embodiment 3 and an LED screen (assembled from multiple LED screens) adhered with an anti-glare, high-coverage and visual color difference improved LED display module packaging film material of the present invention, and a comparison chart of experimental data.

[0109] like Figure 2 As shown, the Figure 2 This is an appearance effect diagram of an LED screen (assembled from multiple LED screens) with a common EVA film layer of Example 4 of Example 3 attached. The color difference experimental data of the LED screen measured by a colorimeter is as shown in Table 3:

[0110]

[0111] like Figure 3 As shown, the Figure 3 This is an appearance effect diagram of an LED screen (assembled from multiple LED screens) attached with an anti-glare, high-coverage and visual color difference improved LED display module packaging film material provided by Example 1 of the present invention. The color difference experimental data of the LED display module packaging film material of the LED screen of the present invention measured by a colorimeter are as follows in Table 4:

[0112]

[0113] First, the method of sampling the experimental data in Tables 3 and 4 above is as follows: a number of LED screens of the same specification are selected and then divided into two groups. The two groups are assembled into two large-sized LED screens. An ordinary EVA film layer and an anti-glare, high-coverage and visual color difference-improving LED display module packaging film material of the present invention are respectively affixed to the two LED screens. Then, the positions of 10 LED screens are randomly and evenly selected from the two LED screens for measurement. The 10 LED screens correspond to number plates 1 to 10, respectively. Then, the colorimeter data of the top, bottom, middle, left and right positions of the 10 LED screens are measured respectively, thereby forming the experimental data of Tables 3 and 4 above, respectively.

[0114] Secondly, the experimental data in Tables 3 and 4 are analyzed as follows:

[0115] 1. The LED screen (assembled from multiple LED screens) is pasted with a common EVA film layer. The variance (the degree of closeness to the average value, the smaller the variance, the more evenly distributed the data) of the color difference value of each assembled LED screen is between 0.0017-0.54, the variance of the A value (red and green) is between 0.001-0.04, and the variance of the B value (yellow and blue) is between 0.002-0.2;

[0116] 2. The LED screen (assembled from multiple LED screens) is pasted with the LED display module packaging film material of the present invention, and the color difference value L value of each assembled LED screen is in the range of 0.003-0.02, the variance range of A value is in the range of 0.0001-0.005, and the variance range of B value is in the range of 0.0007-0.007;

[0117] 3. By comparing the data in points 1 and 2 above, we can see that:

[0118] Table 3: The color difference values ​​(L value, A value and B value) of the LED screen No. 1 and No. 10 with a common EVA film layer are of large variance. Each board has a certain color difference. Obviously, after combining the 10 boards together, the overall variance is larger and the color difference is more obvious.

[0119] Table 4: Between board No. 1 and board No. 10 of the LED screen with the LED display module packaging film material of the present invention, the variance of the color difference values ​​(L value, A value and B value) of each board becomes smaller, the color difference of each board itself becomes smaller, 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, it is more conducive to eliminating the overall color difference, making the overall color difference smaller.

[0120] Finally, in summary, from the above analysis, it can be seen that if the LED screen (assembled from multiple LED screens) is affixed with an anti-glare, high-coverage and visual color difference improved LED display module packaging film material of the present invention, the color difference will be greatly reduced, which greatly improves the visual uniformity, expressiveness and user experience of large-size LED screens.

[0121] Embodiment five:

[0122] The technical solution of the structure of an LED display module packaging film material with anti-glare, high hiding and improved visual color difference in the first embodiment includes:

[0123] The PET substrate in the PET substrate layer 12 is of model GFT05C-24, purchased from Tianjin Wanhua Co., Ltd.;

[0124] The raw materials of the acrylic varnish resin of the acrylic varnish resin material layer of the AG layer outer layer 11 are not limited and can be prepared at will;

[0125] The black ink of the black ink layer of the inner layer 13 of the flexographic printing layer is a super color ink purchased from Super Color Ink Industrial Co., Ltd.;

[0126] The EVA model of the black EVA film layer 2 is 280PV, 2825, purchased from Dow Chemical Company;

[0127] The model of the sunscreen agent is MX-500F, purchased from Soken Chemical (Suzhou) Co., Ltd.;

[0128] The model of carbon black is N330, which was purchased from Jinan Zhongbei Fine Chemical Co., Ltd.;

[0129] The crosslinking agents (triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, diethylene glycol dimethacrylate) were purchased from Changxing Chemical Industry (China) Co., Ltd.

[0130] The photoinitiator models are: 184, 1173, TPO-L, purchased from BASF AG;

[0131] The main oxidant and auxiliary oxidant of the antioxidant were purchased from BASF AG.

[0132] The above are only 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 in the protection scope of the present invention.

Claims

1. An LED display module packaging film material with anti-glare, high hiding and improved visual color difference, characterized in that: The invention comprises a black EVA film layer (2), wherein a PET film layer (1) is arranged on the top of the black EVA film layer (2), wherein the PET film layer (1) comprises a PET substrate layer (12), an AG layer outer layer (11) arranged on the top of the PET substrate layer (12), and a flexographic layer inner layer (13) arranged on the bottom of the PET substrate layer (12), wherein the flexographic layer inner layer (13) is arranged on the 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, a sunscreen: 10 parts, carbon black: 0.08% part, and an auxiliary agent: 2-5 parts, wherein the auxiliary agent comprises the following raw materials in parts by weight: a cross-linking auxiliary agent: 0.5-1 part, a photoinitiator: 0.5-5 parts, and an antioxidant: 0.01-0.05 parts.

2. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The outer layer (11) of the AG layer is an acrylic varnish resin material layer.

3. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The thickness of the PET substrate layer (12) is in the range of 100-125 μm.

4. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The inner layer (13) of the flexographic printing layer is a black ink layer.

5. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The thickness of the inner layer (13) of the flexographic printing layer is in the range of 1.8 μm to 2.5 μm.

6. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The EVA is an ethylene vinyl acetate copolymer with a vinyl acetate VA content of 25%-35% and an MI value of 25-35 g / 10min.

7. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The sunscreen agent includes: one or a mixture of polymethyl methacrylate microspheres, polyethylene microspheres, talcum powder, calcium carbonate, diatomaceous earth, and silicon dioxide.

8. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The carbon black is carbon black particles which are modified by a silane coupling agent and have a diameter ranging from 1 μm to 10 μm.

9. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The crosslinking auxiliary agent in the auxiliary agent includes: one or a mixture of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, and diethylene glycol dimethacrylate; the photoinitiator in the auxiliary agent includes: 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl] ... ]-1-butanone, 2-methyl 2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-propanone, 2-hydroxy-2-methyl-1-(4-hydroxyethoxy) or a mixture of the above; the antioxidant in the auxiliary agent 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; the secondary antioxidant is tris(4-nonylphenol) phosphite or tris(2,4-di-tert-butylphenyl) phosphite or a mixture of the above or both.

10. The LED display module packaging film material with anti-glare, high hiding and improved visual color difference according to claim 1, characterized in that: The surface of the sunscreen agent is treated by organic coating and processed into 10% concentration EVA masterbatch for use; the surface of the carbon black is treated by organic coating and processed into 1% concentration EVA masterbatch for use; the thickness of the black EVA film layer (2) is in the range of 150-180 μm, and the transmittance of the black EVA film layer (2) is in the range of 70-72%.

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