Optical adhesive, liquid crystal display panel, manufacturing method of liquid crystal display panel and display device

Abstract

The invention discloses an optical adhesive, a liquid crystal display panel, a manufacturing method of the liquid crystal display panel and a display device. The optical adhesive is prepared from the following raw materials: epoxy acrylic acid, polyurethane, EVA (Ethylene Vinyl Acetate) resin, a cross-linking agent, a coupling agent, a photoinitiator and microcrystalline wax. The optical cement has the beneficial effects that the hardness (more than 5H) and the high strength of the optical cement can be improved by adding the epoxy acrylic acid and the polyurethane, so that the optical cement can be suitable for a liquid crystal display panel, and an optical cement curing layer prepared from the optical cement is used for replacing an optical cement, a glass cover plate and an explosion-proof film in the prior art; the thickness of an existing liquid crystal display panel can be greatly reduced, due to the fact that the optical cement is large in hardness and high in strength, RTV glue does not need to be coated on the periphery of the LCD panel, the production cost is reduced, and the productivity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display technology, and in particular to an optical adhesive, a liquid crystal display panel, a method for manufacturing a liquid crystal display panel, and a display device. Background Art

[0002] Currently, common solid adhesives for optical components include optically clear adhesive (OCA for short) and SCA (Solid Optically Clear Adhesive). The main component of SCA is acrylic resin. However, the hardness of existing SCA is around 3H. It is generally used for bonding and cannot be used for liquid crystal display panels.

[0003] Figure 1 It is a cross-sectional schematic diagram of a liquid crystal display panel and a liquid crystal display device including an optically transparent adhesive, a glass cover plate, an explosion-proof film and an RTV adhesive in the prior art; Figure 2 It is a cross-sectional schematic diagram of a liquid crystal display panel and a liquid crystal display device including a plastic cover plate and RTV glue in the prior art; Figure 3 It is a schematic diagram of the process flow of the existing liquid crystal display panel edge trimming; like Figures 1 to 3 As shown, in the prior art, the liquid crystal display panel is laminated by means of an LCD panel 200, an optically transparent adhesive 500, a glass cover plate (abbreviated as CG) 600 and an explosion-proof film (abbreviated as ASF) 700. In order to improve the peeling force of filling and reinforcement, as well as the bonding effect, a circle of RTV adhesive 800 is coated around the LCD panel 200, and finally a laminated product is obtained, as shown in FIG. Figure 1 This type of LCD panel has the following problems: 1. The overall structure of the finished product is relatively thick, which is not conducive to overall assembly and can easily reduce customer experience; 2. When applying RTV glue 800, the glue width is extremely difficult to control, and it is easy to cause abnormalities such as glue breaking, which affects the peeling force.

[0004] However, the thickness of the glass cover plate 600 used in the LCD panel is about 1.3mm, and the thickness of the explosion-proof film 700 is about 0.12mm, which makes the thickness of the LCD panel relatively large. Therefore, a plastic cover plate with a thickness of 0.5mm is currently used in the field of LCD panels to replace the glass cover plate and the explosion-proof film. This is because the plastic cover plate has a certain degree of flexibility and a hardness of ≥5h. Therefore, the plastic cover plate does not need to be attached with ASF when it is used in the LCD panel. Figure 2 This plastic cover can make the liquid crystal display panel thinner by 0.92mm. However, the thickness of this plastic cover is still relatively large, and the liquid crystal display panel with the plastic cover needs to use optical transparent glue and explosion-proof film glue, resulting in higher production costs and lower production capacity.

[0005] In addition, due to the limitation of manufacturing process capability, the explosion-proof film of the liquid crystal display panel makes the glass cover plate 600 and the explosion-proof film 700 not aligned, which affects the appearance. If the explosion-proof film 700 and the glass cover plate 600 of the same size are directly attached, there will be an attachment error. The current process of aligning the edges of the glass cover plate 600 and the explosion-proof film 700 is to first attach the explosion-proof film 700 of a fixed size to the glass cover plate 600, so that the edge of the explosion-proof film 700 exceeds the edge of the glass cover plate 600, and then use laser cutting technology to cut the excess part of the explosion-proof film 700 to the edge of the glass cover plate 600 The distance is ≤0.1mm, such as Figure 3 However, this cutting method makes the edge of the explosion-proof film 700 easily produce a bumpy and granular feeling, and the edge is easily burnt. Summary of the invention

[0006] In order to overcome the shortcomings and deficiencies in the prior art, the first object of the present invention is to provide an optical adhesive to solve the problem that the SCA in the prior art has low hardness and cannot be directly used as a cover plate of a liquid crystal display panel.

[0007] The purpose of the present invention is achieved through the following technical solutions: The invention provides an optical adhesive, the raw materials of which contain epoxy acrylic acid, polyurethane, EVA resin, a crosslinking agent, a coupling agent, a photoinitiator and microcrystalline wax.

[0008] The optical adhesive of the present invention comprises, by mass, 1 to 8 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 78 to 88 parts of EVA resin, 0.1 to 1.5 parts of a crosslinking agent, 0.1 to 2 parts of a coupling agent, 0.05 to 2 parts of a photoinitiator and 0.5 to 3 parts of microcrystalline wax.

[0009] Further, the optical adhesive of the present invention comprises, in parts by mass: 2 to 7 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 80 to 85 parts of EVA resin, 0.2 to 1 part of cross-linking agent, 0.2 to 1 part of coupling agent, 0.1 to 1 part of photoinitiator and 1 to 2 parts of microcrystalline wax.

[0010] The raw materials of the optical adhesive include epoxy acrylic acid, polyurethane, EVA resin, crosslinking agent, coupling agent, photoinitiator and microcrystalline wax. The beneficial effect of the optical adhesive is that the hardness (above 5H) and high strength of the optical adhesive can be improved by adding epoxy acrylic acid and polyurethane, so that the optical adhesive can be suitable for liquid crystal display panels.

[0011] The second object of the present invention is to provide a liquid crystal display panel with optical adhesive to solve the problem of reducing the thickness of the liquid crystal display panel and improving the production capacity in the prior art.

[0012] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a liquid crystal display panel with the optical adhesive, comprising an LCD panel and an optical adhesive curing layer stacked on the light-emitting side of the LCD panel, wherein the optical adhesive curing layer is made of the optical adhesive.

[0013] Preferably, the thickness of the optical adhesive curing layer is 0.23 mm to 0.28 mm.

[0014] The liquid crystal display panel with optical adhesive of the present invention is further provided with a first polarizer, and the first polarizer is attached and connected to the optical adhesive curing layer.

[0015] The optical adhesive curing layer is disposed between the first polarizer and the LCD panel, and the first polarizer is attached to a side of the optical adhesive curing layer away from the LCD panel.

[0016] or, The first polarizer is disposed between the optical adhesive curing layer and the LCD panel, and the optical adhesive curing layer is attached to a side of the first polarizer away from the LCD panel.

[0017] The liquid crystal display panel with optical adhesive comprises an LCD panel and an optical adhesive curing layer stacked on the light-emitting side of the LCD panel, wherein the optical adhesive curing layer is made of the above optical adhesive. The liquid crystal display panel with optical adhesive has the beneficial effect that the optical adhesive curing layer made of the above optical adhesive replaces the optical transparent adhesive, glass cover plate and explosion-proof film in the prior art, and the thickness of the existing liquid crystal display panel can be greatly reduced. Since the optical adhesive curing layer has high hardness and strength, it is not necessary to apply RTV adhesive around the LCD panel, thereby reducing production costs and improving production capacity.

[0018] The third object of the present invention is to provide a method for manufacturing the above-mentioned liquid crystal display panel, so as to solve the problem in the prior art that the liquid crystal display panel has uneven surface edges, which affects the appearance.

[0019] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a method for manufacturing a liquid crystal display panel, which is performed by the following steps: S1, attaching and connecting the optical adhesive cured layer to the first polarizer to obtain a composite layer structure; S2, cutting the composite layer structure obtained in S1 to obtain a composite layer structure with flush edges; S3, stacking the edge-aligned composite layer structure obtained in S2 and the LCD panel to obtain the liquid crystal display panel.

[0020] Preferably, an ink layer is sprayed around the edge of the optical adhesive curing layer.

[0021] The manufacturing method of the liquid crystal display panel is to manufacture the liquid crystal display panel through three steps. The beneficial effect of the manufacturing method is that the surface of the liquid crystal display panel can be made flush by directly cutting the composite layer structure, thereby improving the overall appearance of the liquid crystal display panel.

[0022] A fourth object of the present invention is to provide a display device as described above to solve the problem of reducing the thickness of a liquid crystal display panel and improving production capacity in the prior art.

[0023] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a display device, comprising a backlight module, a second polarizer, a flexible printed circuit board, a PCBA, a supporting structure, and the above-mentioned liquid crystal display panel, wherein the liquid crystal display panel, the second polarizer, the backlight module and the PCBA are stacked in sequence, and the second polarizer, the backlight module and the PCBA are all far away from the light emitting side of the liquid crystal display panel, the flexible printed circuit board is located on one side of the stacked structure composed of the LCD panel, the second polarizer, the PCBA and the backlight module in the liquid crystal display panel, and the LCD panel, the second polarizer, the PCBA, the backlight module and the flexible printed circuit board are all located inside the supporting structure.

[0024] Preferably, an ink layer is sprayed around the edge of the optical adhesive curing layer of the above-mentioned liquid crystal display panel, and the ink layer is close to the light emitting side of the LCD panel.

[0025] The display device includes the above-mentioned liquid crystal display panel. The beneficial effect of the display device is that the liquid crystal display panel uses the above-mentioned optical glue curing layer to replace the optical transparent glue, glass optical glue curing layer and explosion-proof film in the prior art, which can greatly reduce the thickness of the existing liquid crystal display panel. Since the optical glue curing layer has high hardness and strength, there is no need to apply RTV glue around the LCD panel, thereby reducing production costs and improving production capacity.

[0026] A fifth object of the present invention is to provide a display device as described above to solve the problem of reducing the thickness of a liquid crystal display panel and improving production capacity in the prior art.

[0027] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a display device, comprising a backlight module, a second polarizer, a flexible printed circuit board, a PCBA, a supporting structure, a B-cover, and a liquid crystal display panel according to any one of claims 4 to 6, wherein the liquid crystal display panel, the second polarizer, the backlight module and the PCBA are stacked in sequence, and the second polarizer, the backlight module and the PCBA are all away from the light emitting side of the liquid crystal display panel, the flexible printed circuit board is located on one side of the stacked structure composed of the LCD panel, the second polarizer, the PCBA and the backlight module in the liquid crystal display panel, the LCD panel, the second polarizer, the PCBA, the backlight module and the flexible printed circuit board are all located inside the supporting structure, and the backlight module, the second polarizer, the flexible printed circuit board, the PCBA, the supporting structure and the liquid crystal display panel are all located inside the B-cover.

[0028] Preferably, the B-cover is provided with an opening, and the opening serves as a light exit channel of the liquid crystal display panel.

[0029] The display device includes the above-mentioned liquid crystal display panel. The beneficial effect of the display device is that the liquid crystal display panel uses the above-mentioned optical glue curing layer to replace the optical transparent glue, glass optical glue curing layer and explosion-proof film in the prior art, which can greatly reduce the thickness of the existing liquid crystal display panel. Since the optical glue curing layer has high hardness and strength, there is no need to apply RTV glue around the LCD panel, thereby reducing production costs and improving production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional schematic diagram of a liquid crystal display panel and a liquid crystal display device including an optically transparent adhesive, a glass cover plate, an explosion-proof film and an RTV adhesive in the prior art; Figure 2 It is a cross-sectional schematic diagram of a liquid crystal display panel and a liquid crystal display device including a plastic cover plate and RTV glue in the prior art; Figure 3 It is a schematic diagram of the process flow of the existing liquid crystal display panel edge trimming; Figure 4 is a cross-sectional schematic diagram of a liquid crystal display device including the liquid crystal display panel of Embodiment 7; Figure 5 is a schematic cross-sectional view of a liquid crystal display device including the liquid crystal display panel of the eighth embodiment; Figure 6 is a schematic cross-sectional view of a liquid crystal display device including the liquid crystal display panel of the eighth embodiment; Figure 7 This is a method for manufacturing a liquid crystal display panel according to a ninth embodiment; Figure 8This is a method for manufacturing a liquid crystal display panel according to a ninth embodiment.

[0031] In the figure: optical adhesive curing layer 100, LCD panel 200, first polarizer 300, ink layer 400, optical transparent adhesive 500, glass cover 600, explosion-proof film 700, RTV adhesive 800, plastic optical adhesive curing layer 900, flexible printed circuit board 1100, backlight module 1200, protective film 1300, PCBA 1400, support structure 1500, second polarizer 1600, B-cover 1700. DETAILED DESCRIPTION

[0032] Unless otherwise specified, the raw materials used in the following embodiments are all commercially available products. In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, characteristics and effects of an optical adhesive, a liquid crystal display panel, a method for manufacturing a liquid crystal display panel and a display device proposed by the present invention as follows: [Example 1] The first embodiment of the present invention provides an optical adhesive (Hardness Optically Clear Adhesive, referred to as HCA), the raw materials of which include epoxy acrylate, polyurethane, EVA resin, a cross-linking agent, a coupling agent, a photoinitiator and microcrystalline wax.

[0033] In parts by mass: 1 to 8 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 78 to 88 parts of EVA resin, 0.1 to 1.5 parts of cross-linking agent, 0.1 to 2 parts of coupling agent, 0.05 to 2 parts of photoinitiator and 0.5 to 3 parts of microcrystalline wax.

[0034] The molecular formula of epoxy acrylate is: OH-CH2-CH(CH3)-C(=O)-O-CH2-CH(CH3)-OH, and the molecular formula of polyurethane is: (C10H8N2O2·C6H14O3)n. The crosslinking agent, coupling agent and photoinitiator of the present invention are all commonly used crosslinking agents, coupling agents and photoinitiators. The coupling agent in the present invention enables the optical adhesive to form stronger physical and chemical interactions inside, and significantly improves the interfacial adhesion and mechanical properties of the optical adhesive layer without affecting the bonding effect and the repair effect. The photoinitiator of the present invention is a substance that can absorb radiation energy, undergo chemical changes after excitation, and produce active intermediates with the ability to initiate polymerization, thereby initiating polymerization, crosslinking and curing.

[0035] The crosslinking agent may be one or more of di-tert-butyl peroxide, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene hydroperoxide, and benzoyl peroxide. The coupling agent may be one or more of silane coupling agent, sulfur silane coupling agent, amino silane coupling agent, and epoxy silane coupling agent. The photoinitiator may be one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin and its derivatives, benzil and its derivatives, dialkoxyacetophenone, α-hydroxyalkyl phenone, benzophenone and its derivatives, vinyl sulfide compounds, diazonium salts, diaryl iodonium salts, triaryl sulfonium salts, alkyl sulfonium salts, and iron aromatic salts. The molecular weight of the epoxy acrylate polymer is 1500 to 3000, and the molecular weight of the polyurethane is 2000 to 10000.

[0036] This embodiment provides a method for preparing an optical adhesive HCA for reference. The method for preparing an optical adhesive HCA includes the following steps: Step 1: Evenly mix epoxy acrylate, polyurethane, EVA resin, photoinitiator and microcrystalline wax to obtain a mixture; wherein, in this embodiment, the crosslinking agent is di-tert-butyl peroxide, the coupling agent is an epoxy silane coupling agent, and the photoinitiator is α-hydroxyalkyl phenone. The molecular weight of the epoxy acrylate polymer is 2000, and the molecular weight of the polyurethane is 6000.

[0037] Step 2: introduce the mixture obtained in step 1 into a twin-screw extruder, extrude it through a melt pump at the end of the twin-screw extruder, and then extrude it through a screen filter, and calender it into a film to obtain an optical adhesive HCA; at the same time, attach a layer of protective release film to the front and back sides of the optical adhesive HCA to obtain an optical adhesive cured layer.

[0038] The present invention has high hardness (≥5H) and high strength (200N / 25mm), optical properties, filling performance, and explosion-proof performance that are basically consistent with the existing SCA after adding epoxy acrylic acid and polyurethane. Therefore, the optical adhesive HCA of the present invention can be applied to liquid crystal display panels.

[0039] [Example 2] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 2 to 7 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 80 to 85 parts of EVA resin, 0.2 to 1 part of cross-linking agent, 0.2 to 1 part of coupling agent, 0.1 to 1 part of photoinitiator and 1 to 2 parts of microcrystalline wax.

[0040] It should be understood by those skilled in the art that the remaining components and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0041] [Example 3] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 1 part of epoxy acrylate, 7 parts of polyurethane, 78 parts of EVA resin, 0.1 part of cross-linking agent, 2 parts of coupling agent, 2 parts of photoinitiator and 0.5 part of microcrystalline wax.

[0042] It should be understood by those skilled in the art that the remaining ingredients and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0043] [Example 4] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 8 parts of epoxy acrylate, 2 parts of polyurethane, 88 parts of EVA resin, 1.5 parts of cross-linking agent, 0.1 parts of coupling agent, 0.05 parts of photoinitiator and 3 parts of microcrystalline wax.

[0044] It should be understood by those skilled in the art that the remaining ingredients and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0045] [Example 5] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 2 parts of epoxy acrylate, 5 parts of polyurethane, 80 parts of EVA resin, 1 part of cross-linking agent, 0.2 parts of coupling agent, 1 part of photoinitiator and 1 part of microcrystalline wax.

[0046] It should be understood by those skilled in the art that the remaining ingredients and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0047] [Example 6] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 7 parts of epoxy acrylate, 6 parts of polyurethane, 85 parts of EVA resin, 0.2 parts of cross-linking agent, 1 part of coupling agent, 0.1 parts of photoinitiator and 2 parts of microcrystalline wax.

[0048] It should be understood by those skilled in the art that the remaining ingredients and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0049] [Example 7] The optical adhesive HCA provided in this embodiment is basically the same as the optical adhesive HCA in Example 1, except that, in this embodiment, the following are calculated by mass: 5 parts of epoxy acrylate, 6 parts of polyurethane, 82 parts of EVA resin, 0.8 parts of cross-linking agent, 0.6 parts of coupling agent, 0.5 parts of photoinitiator and 1.6 parts of microcrystalline wax.

[0050] It should be understood by those skilled in the art that the remaining ingredients and preparation methods of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0051] [Test example] 1. Surface hardness test 1.1. Under the same conditions, the surface hardness of the optical adhesive cured layers prepared in Examples 3 to 7 and the cured layers obtained after curing the commercially available SCA was tested with a load of 500 g, and the results are shown in Table 1: Table 1. Surface hardness data

[0052] Among them, 1#-5# were tested 5 times for the same optical adhesive curing layer.

[0053] It can be seen from Table 1 that the surface hardness of the optical adhesive cured layer made of the optical adhesive HCA of the present invention reaches above 5H, which is much higher than the existing SCA.

[0054] 1.2. When other conditions are the same, the optical adhesive cured layers prepared in Examples 3 to 7 are as shown in Table 2: Table 2, ink adhesion data

[0055] 1.3. The ink thickness test of the optical adhesive cured layer made of the optical adhesive HCA of Examples 3 to 7 was performed, and the results are shown in Table 3: Table 3, ink thickness data

[0056] It can be seen from the data in Table 2 and Table 3 that the pencil hardness and ink test of the optical adhesive cured layer obtained by the present invention meet the basic requirements of the glass cover plate CG, and thus can replace the glass cover plate CG.

[0057] 2. Peeling test The optical adhesive cured layers prepared in Examples 3 to 7 were subjected to a Peeling test. The test conditions were: pressure head diameter: 1.5 mm; speed: V=10 (mm / min); starting at 0.5 kg, increasing by 0.5 kg, 5 kg / 1 min Peeling>3 kg, and Table 4 was obtained.

[0058] Table 4. Peeling test data

[0059] It can be seen from the Peeling test data in Table 4 that the optical adhesive cured layer made of the optical adhesive HCA of the present invention has strong peeling force and strength.

[0060] 3. Drop ball test When other conditions are the same, the optical adhesive curing layer prepared in Examples 3 to 7 has the following characteristics: steel ball weight: 32.5 g; steel ball diameter: 20 mm; steel ball height: 65 cm; test points: center point and four corners of the panel (2.54 cm away from the edge of each corner); number of steel ball drops: 3 times, and Table 5 is obtained.

[0061] Table 5. Drop ball test data

[0062] It can be seen from Table 5 that the optical adhesive cured layer made from the optical adhesive HCA of the present invention has good explosion-proof property and high strength.

[0063] [Embodiment 8] As stated in the attached Figure 4 , 5 As shown in FIG. 6 , a liquid crystal display panel with optical adhesive of the present invention includes an LCD panel 200 and an optical adhesive curing layer 100 stacked on the light-emitting side of the LCD panel 200 . The optical adhesive curing layer 100 is made of any one of the optical adhesives of Embodiments 3 to 7.

[0064] It should be noted that Figures 4 to 6 A schematic diagram of the entire cross section of a liquid crystal display device including the liquid crystal display panel of the present invention, wherein the liquid crystal display panel is only the upper layer portion above the LCD panel 200 in the liquid crystal display device.

[0065] According to a specific embodiment of the present invention, the thickness of the optical adhesive curing layer 100 is 0.23 mm to 0.28 mm, for example, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, etc., preferably 0.25 mm.

[0066] The liquid crystal display panel of the present invention uses an optical adhesive curing layer 100 to replace the optically transparent adhesive 500, the glass cover plate 600 and the explosion-proof film 700 of the prior art. At the same time, there is no need to apply a circle of RTV adhesive 800 around the LCD panel 200. When the thickness of the optical adhesive curing layer 100 is 0.25 mm, the liquid crystal display panel of the present invention is thinned to 1.17 mm compared with the existing liquid crystal display panel with optically transparent adhesive 500, glass cover plate 600 and explosion-proof film 700.

[0067] The liquid crystal display panel with the optical adhesive curing layer 100 of the present invention is further provided with a first polarizer 300 , and the first polarizer 300 is attached and connected to the optical adhesive curing layer 100 .

[0068] The optical adhesive curing layer 100 is disposed between the first polarizer (referred to as upper POL) 300 and the LCD panel 200, and the first polarizer 300 is attached to the side of the optical adhesive curing layer 100 away from the LCD panel 200. Figure 4 and Figure 6 The first polarizer 300 may also be disposed between the optical adhesive curing layer 100 and the LCD 200 panel, and the optical adhesive curing layer 100 is attached to the side of the first polarizer 300 away from the LCD panel 200, such as Figure 7 .

[0069] When the first polarizer 300 is attached to the side of the optical adhesive curing layer 100 away from the LCD panel 200 , the first polarizer 300 also has an explosion-proof effect on the optical adhesive curing layer 100 , further improving the performance of the liquid crystal display panel.

[0070] When other conditions are the same, the existing 14-inch liquid crystal display panel and the liquid crystal display panel of the present invention are used and actual measurements are performed, as shown in Table 6.

[0071] Table 6. Performance data comparison between the existing liquid crystal display panel and the liquid crystal display panel of the present invention

[0072] In Table 6, Wx, Wy, Rx, Ry, Gx, Gy, Bx and By are the x and y coordinate values ​​in the color gamut coordinates, and W, R, G and B are white, red, green and blue, respectively.

[0073] From the light transmittance TR in Table 6, it can be seen that the light transmittance of the existing liquid crystal display panel is 3.89%, while the light transmittance of the liquid crystal display panel of the present invention is 4.01%, which is improved by 3.08%.

[0074] In summary, the present invention does not need to use a glass cover plate 600, an optically transparent adhesive 500, an explosion-proof film 700, or an RTV adhesive 800, thereby increasing production capacity and reducing production costs. As the overall thickness of the liquid crystal display panel becomes thinner, transmittance is increased and power consumption is reduced.

[0075] [Example 9] A method for manufacturing a liquid crystal display panel according to the eighth embodiment is performed by the following steps: S1, attaching and connecting the optical adhesive curing layer 100 and the first polarizer 300 to obtain a composite layer structure; S2, cutting the composite layer structure obtained in S1 to obtain a composite layer structure with flush edges; S3, stacking the edge-aligned composite layer structure obtained in S2 and the LCD panel 200 to obtain a liquid crystal display panel.

[0076] The method for manufacturing the liquid crystal display panel of the present invention can also spray an ink layer 400 around the edge of the optical adhesive curing layer 100 according to actual conditions.

[0077] It should be noted that the ink layer 400 spraying technology of the present invention is a conventional operation in the art, and can be a technology that sprays ink materials in the form of tiny droplets onto the surface or side of a target substrate through an inkjet print head to obtain a preset pattern or film.

[0078] The manufacturing method of the liquid crystal display panel of this embodiment can be specifically divided into two cases. The first case is to cut the optical adhesive curing layer 100 into small pieces, attach and connect the first polarizer 300, cut the edges, and finally stack it with the LCD panel 200. Figure 7 Specifically, the optical adhesive curing layer 100 with protective films 1300 on both sides is firstly attached, and then cut into small pieces, and then one of the protective films 1300 of the small optical adhesive curing layer 100 is removed, and the ink layer 400 is sprayed on the four sides of one side of the optical adhesive curing layer 100 (the ink layer 400 may not be provided), and then the protective film 1300 is attached; then the protective film 1300 on the other side is removed, and the first polarizer 300 is attached and connected, and the size of the first polarizer 300 is smaller than that of the optical adhesive curing layer 100 to obtain a composite layer structure; then the first polarizer 300 is cut along the edges to obtain a composite layer structure with the edges, and finally the protective film 1300 of the composite layer structure is removed and attached and stacked with the LCD panel 200 to obtain the liquid crystal display panel of the present invention.

[0079] The second method is to attach a large optical adhesive curing layer 100 to the first polarizer 300, cut it into small pieces, trim it to the same edge, and finally stack it with the LCD panel 200. Figure 8 Specifically, one of the protective films 1300 in the optical adhesive curing layer 100 with protective films 1300 on both sides is removed, and then the first polarizer 300 is attached and connected to obtain a composite layer structure, the size of the first polarizer 300 can be larger or smaller than the optical adhesive curing layer 100, and then the composite layer structure is cut into small pieces, and the cut small pieces of the composite layer structure have even edges, and then the other side of the protective film 1300 is removed, and the ink layer 400 is sprayed on the four sides of one side of the optical adhesive curing layer 100 (the ink layer 400 may not be provided), and then the protective film 1300 is attached, and finally the protective film 1300 of the composite layer structure is removed and attached and stacked with the LCD panel 200 to obtain the liquid crystal display panel of the present invention.

[0080] The liquid crystal display panel can achieve a flush surface effect of the liquid crystal display panel by directly cutting the composite layer structure, thereby improving the overall viewing experience of the liquid crystal display panel.

[0081] [Example 9] A display device, comprising the liquid crystal display panel of embodiment 8, such as Figure 4 or Figure 5 , including a backlight module (referred to as B / L) 1200, a second polarizer (referred to as lower POL) 1600, a flexible printed circuit board (referred to as FPC) 1100, a PCBA (Printed Circuit Board Assembly) 1400, a supporting structure 1500, and a liquid crystal display panel as in Example 8, wherein the liquid crystal display panel, the second polarizer 1600, the backlight module 1200 and the PCBA 1400 are stacked in sequence, and the second polarizer 1600, the backlight module 1200 and the PCBA 1400 are all away from the light emitting side of the liquid crystal display panel, the flexible printed circuit board 1100 is located on one side of the stacked structure composed of the LCD panel 200, the second polarizer 1600, the PCBA 1400 and the backlight module 1200 in the liquid crystal display panel, and the LCD panel 200, the second polarizer 1600, the PCBA 1400 , the backlight module 1200 and the flexible printed circuit board 1100 are all located inside the supporting structure 1500 .

[0082] It should be noted that the display device has a first polarizer 300 and a second polarizer 1600, wherein the first polarizer 300 is located on the light-emitting side of the LCD panel 200, and the second polarizer 1600 is away from the light-emitting side of the LCD panel 200, and the light transmission axis of the first polarizer 300 and the light transmission axis of the second polarizer 1600 are perpendicular to each other.

[0083] An ink layer 400 is sprayed around the edge of the optical adhesive curing layer 100 of the liquid crystal display panel, and the ink layer 400 is close to the light emitting side of the LCD panel 200 .

[0084] The liquid crystal display panel in the display device uses the above-mentioned optical adhesive curing layer 100 to replace the optical transparent adhesive 500, the glass cover 600 and the explosion-proof film 700 in the prior art, which can greatly reduce the thickness of the existing liquid crystal display panel. Since the optical adhesive curing layer 100 has high hardness and strength, there is no need to apply RTV adhesive 800 around the LCD panel 200, thereby reducing production costs and improving production capacity.

[0085] [Example 10] A display device, comprising the liquid crystal display panel of embodiment 8, such as Figure 6, including a backlight module 1200, a second polarizer 1600, a flexible printed circuit board 1100, a PCBA 1400, a supporting structure 1500, a B-cover (back cover) 1700, and a liquid crystal display panel as in the eighth embodiment, wherein the liquid crystal display panel, the second polarizer 1600, the backlight module 1200 and the PCBA 1400 are stacked in sequence, and the second polarizer 1600, the backlight module 1200 and the PCBA 1400 are all away from the light emitting side of the liquid crystal display panel, the flexible printed circuit board 1100 is located on one side of the stacked structure composed of the LCD panel 200, the second polarizer 1600, the PCBA 1400 and the backlight module 1200, and the LCD panel 200, the second polarizer 1600, the PCBA 1400, the backlight module 1200 and the flexible printed circuit board 1100 are all located inside the supporting structure 1500, and the backlight module 1200, the second polarizer 1600, the flexible printed circuit board 1100, the PCBA 1400, the supporting structure 1500 and the liquid crystal display panel are all located inside the B-cover 1700, and the B-cover 1700 is provided with an opening, which serves as a light outlet channel for the liquid crystal display panel.

[0086] It should be noted that the display device of the present invention uses a B-cover 1700 for shielding, so there is no need to spray the ink layer 400 on the edge of the LCD panel 200. The display device has a first polarizer 300 and a second polarizer 1600, wherein the first polarizer 300 is located on the light-emitting side of the LCD panel 200, and the second polarizer 1600 is away from the light-emitting side of the LCD panel 200, and the light transmission axis of the first polarizer 300 and the light transmission axis of the second polarizer 1600 are perpendicular to each other.

[0087] The liquid crystal display panel in the display device uses the above-mentioned optical adhesive curing layer 100 to replace the optical transparent adhesive 500, the glass cover 600 and the explosion-proof film 700 in the prior art, which can greatly reduce the thickness of the existing liquid crystal display panel. Since the optical adhesive curing layer 100 has high hardness and strength, there is no need to apply RTV adhesive 800 around the LCD panel 200, thereby reducing production costs and improving production capacity.

[0088] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0089] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An optical adhesive, characterized in that: The raw materials contain epoxy acrylate, polyurethane, EVA resin, cross-linking agent, coupling agent, photoinitiator and microcrystalline wax.

2. The optical adhesive according to claim 1, characterized in that: In parts by mass: 1 to 8 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 78 to 88 parts of EVA resin, 0.1 to 1.5 parts of cross-linking agent, 0.1 to 2 parts of coupling agent, 0.05 to 2 parts of photoinitiator and 0.5 to 3 parts of microcrystalline wax.

3. The optical adhesive according to claim 1, characterized in that: In parts by mass: 2 to 7 parts of epoxy acrylate, 2 to 7 parts of polyurethane, 80 to 85 parts of EVA resin, 0.2 to 1 part of cross-linking agent, 0.2 to 1 part of coupling agent, 0.1 to 1 part of photoinitiator and 1 to 2 parts of microcrystalline wax.

4. A liquid crystal display panel with optical adhesive, characterized in that: It comprises an LCD panel and an optical adhesive curing layer stacked on the light-emitting side of the LCD panel, wherein the optical adhesive curing layer is made of the optical adhesive as claimed in any one of claims 1 to 3.

5. The liquid crystal display panel with optical adhesive according to claim 4, characterized in that: The thickness of the optical adhesive curing layer is 0.23 mm to 0.28 mm.

6. The liquid crystal display panel with optical adhesive according to claim 4 or 5, characterized in that: A first polarizer is also provided, and the first polarizer is attached and connected to the optical adhesive curing layer; The optical adhesive curing layer is arranged between the first polarizer and the LCD panel, and the first polarizer is attached to the side of the optical adhesive curing layer away from the LCD panel; or, the first polarizer is arranged between the optical adhesive curing layer and the LCD panel, and the optical adhesive curing layer is attached to the side of the first polarizer away from the LCD panel.

7. A method for manufacturing a liquid crystal display panel according to any one of claims 4 to 6, characterized in that: The following steps are performed: S1, attaching and connecting the optical adhesive cured layer to the first polarizer to obtain a composite layer structure; S2, cutting the composite layer structure obtained in S1 to obtain a composite layer structure with flush edges; S3, stacking the edge-aligned composite layer structure obtained in S2 and the LCD panel to obtain the liquid crystal display panel.

8. The method for manufacturing a liquid crystal display panel according to claim 7, characterized in that: An ink layer is sprayed around the edge of the optical adhesive curing layer.

9. A display device, characterized in that: A device comprising a backlight module, a second polarizer, a flexible printed circuit board, a PCBA, a supporting structure, and a liquid crystal display panel according to any one of claims 4 to 6, wherein the liquid crystal display panel, the second polarizer, the backlight module and the PCBA are stacked in sequence, and the second polarizer, the backlight module and the PCBA are all away from the light-emitting side of the liquid crystal display panel, the flexible printed circuit board is located on one side of the stacked structure composed of the LCD panel, the second polarizer, the PCBA and the backlight module in the liquid crystal display panel, and the LCD panel, the second polarizer, the PCBA, the backlight module and the flexible printed circuit board are all located inside the supporting structure; An ink layer is sprayed around the edge of the optical adhesive curing layer of the liquid crystal display panel, and the ink layer is close to the light emitting side of the LCD panel.

10. A display device, characterized in that: A device comprising a backlight module, a second polarizer, a flexible printed circuit board, a PCBA, a support structure, a B-cover, and a liquid crystal display panel according to any one of claims 4 to 6, wherein the liquid crystal display panel, the second polarizer, the backlight module and the PCBA are stacked in sequence, and the second polarizer, the backlight module and the PCBA are all away from the light-emitting side of the liquid crystal display panel, the flexible printed circuit board is located on one side of the stacked structure composed of the LCD panel, the second polarizer, the PCBA and the backlight module in the liquid crystal display panel, the LCD panel, the second polarizer, the PCBA, the backlight module and the flexible printed circuit board are all located inside the support structure, and the backlight module, the second polarizer, the flexible printed circuit board, the PCBA, the support structure and the liquid crystal display panel are all located inside the B-cover; The B-cover is provided with an opening, and the opening serves as a light exit channel of the liquid crystal display panel.

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