Method for attaching polarizing plate

Abstract

The present invention provides a method for attaching a polarizing plate. The method includes providing a polarizing fixture, the polarizing fixture includes a soft film; placing a polarizing plate on the soft film of the polarizing fixture, the polarizing plate includes a surface protection film, a polarizer, and a release film, wherein the surface protection film includes a plurality of magnetic substances, the polarizer is located on the surface protection film, and the release film is located on the polarizer; placing an adhesive stick on the release film of the polarizing plate; placing a magnet under the soft film of the polarizing fixture at a position corresponding to the adhesive stick, and adsorbing the polarizing plate on the soft film by magnetic adsorption; and using the adhesive stick to tear off the release film.

Description

Technical Field

[0001] The invention relates to a polarizing plate, a surface protective film thereof, and a method for attaching the polarizing plate. Background Art

[0002] Televisions, computer screens, and laptops are still moving towards becoming thinner and lighter. For example, the thickness of a laptop can be reduced to less than 1 cm. Not only the plastic shell, but also the thinning of the display panel is important. The thickness of the display panel has been reduced from 2.8 mm in the early days to less than 2 mm. In the competition of specifications within 1 mm, the thickness of various components such as polarizers has also become a key factor. Summary of the invention

[0003] When the thickness of the polarizing plate is continuously reduced, problems such as warping of the polarizing plate may occur. Therefore, the present invention provides a polarizing plate, a surface protection film thereof, and a method for attaching a polarizing plate to solve or at least alleviate the problem of warping of the polarizing plate.

[0004] The surface protection film according to the embodiment includes a surface treatment layer, a main body layer, and an adhesive layer. The main body layer is arranged on the surface treatment layer. The adhesive layer is arranged on the main body layer. At least one of the surface treatment layer and the adhesive layer contains a plurality of magnetic substances.

[0005] The polarizing plate according to the embodiment includes the surface protection film as described above and a polarizer. The polarizer is disposed on the surface protection film. The adhesive layer of the surface protection film is used to bond the polarizer to the surface protection film.

[0006] The method for attaching a polarizing plate according to the embodiment includes the following steps. First, a polarizing jig is provided. The polarizing jig includes a soft film. A polarizing plate is arranged on the soft film of the polarizing jig. The polarizing plate includes a surface protection film, a polarizer, and a release film, wherein the surface protection film includes a plurality of magnetic substances, the polarizer is located on the surface protection film, and the release film is located on the polarizer. Then, a sticky stick is arranged on the release film of the polarizing plate. In addition, a magnet is arranged at a position corresponding to the sticky stick under the soft film of the polarizing jig, and the polarizing plate is adsorbed on the soft film by magnetic adsorption force. Afterwards, the release film is torn off using the sticky stick.

[0007] In order to better understand the above and other aspects of the present invention, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of an exemplary polarizing plate.

[0009] Figure 2 is a schematic diagram of an exemplary surface protection film.

[0010] Figure 3 is a schematic diagram of another exemplary surface protection film.

[0011] Figure 4 is a flow chart of an exemplary method for attaching a polarizing plate.

[0012] Figures 5A-5B to Fig. 9 is a schematic diagram of an exemplary method of attaching a polarizing plate.

[0013] Fig.10 is a schematic diagram of an experimental setup for magnetic adsorption.

[0014] Fig.11 This is a diagram of the experimental results of magnetic adsorption.

[0015] Wherein, the reference numerals are:

[0016] 100:Polarizing plate

[0017] 110: Surface protection film

[0018] 110': Surface protection film

[0019] 112: Surface treatment layer

[0020] 112': Surface treatment layer

[0021] 114: Main layer

[0022] 116: Adhesive layer

[0023] 116': Adhesive layer

[0024] 118: Magnetic material

[0025] 118': Magnetic material

[0026] 120: Polarizer

[0027] 130: Release film

[0028] 200: Partially attached to the fixture

[0029] 210: Soft film

[0030] 220:Abutment

[0031] 230: Airtight membrane

[0032] 240: Vacuum chamber

[0033] 250: Sticky stick

[0034] 260: Magnet

[0035] 310:Polarizing plate

[0036] 320: Double-sided tape

[0037] 330: Iron Fan

[0038] 340: Release film

[0039] 350: Magnet

[0040] 360: ruler

[0041] S10: Steps

[0042] S20: Steps

[0043] S30: Steps

[0044] S40: Steps

[0045] S50: Steps DETAILED DESCRIPTION

[0046] The following will be described in more detail with reference to the accompanying drawings for various different embodiments. For the sake of clarity, the components may not be illustrated according to their actual conditions (including proportions and distribution, etc.). In addition, the following content and the accompanying drawings are only provided for illustration and are not intended to be limiting. For example, as long as it does not deviate from the spirit of the present invention, other components may be included in the structure of the present invention, the configuration of the components or materials may be adjusted, two or more components may be integrated, or other adjustments may be made. For another example, as long as it does not deviate from the spirit of the present invention, other steps may be added in the method of the present invention, the order of the steps may be adjusted, two or more steps may be integrated, or other adjustments may be made. It is contemplated that the components and features in one embodiment can be advantageously incorporated in another embodiment without further elaboration.

[0047] Please refer to Figure 1 , which shows an exemplary polarizing plate 100 . The polarizing plate 100 includes a surface protection film 110 and a polarizer 120 . The surface protection film 110 includes a plurality of magnetic substances. The polarizer 120 is disposed on the surface protection film 110 .

[0048] Specifically, the surface protection film 110 may be Figure 2 As shown, it includes a surface treatment layer 112, a main layer 114, and an adhesive layer 116. The main layer 114 is disposed on the surface treatment layer 112. The adhesive layer 116 is disposed on the main layer 114 and is used to bond the polarizer 120 to the surface protection film 110. At least one of the surface treatment layer 112 and the adhesive layer 116 contains a magnetic substance 118. Figure 2In the example, the adhesive layer 116 includes a magnetic substance 118. According to some embodiments, the magnetic substance 118 may be a magnetic powder, such as iron powder, cobalt powder or nickel powder. According to some embodiments, the magnetic substance 118 may be a magnetic ceramic material, such as ferrite magnets or ferrites. Ferrites will exhibit different magnetic properties due to different molecular structures. For example, nickel-zinc ferrite magnets, manganese-zinc ferrite magnets, γ-iron oxide, barium ferrite magnets, strontium ferrite magnets, etc. According to some embodiments, the magnetic substance 118 may be anisotropic iron oxide powder, but is not limited thereto. According to some embodiments, the content of the magnetic substance 118 in the surface treatment layer 112 and / or the adhesive layer 116 is 0.001 g / mm 3 If converted into planar density, the content of magnetic material 118 can be 0.03 g / cm 3 When the content of the magnetic substance 118 is too little, the magnet in the attachment process needs to be closer to the polarizing plate 100, or the magnetic force needs to be increased. These situations may cause difficulties in the attachment process.

[0049] The surface treatment layer 112 may include one or more layers associated with, for example, anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-static treatment, and / or anti-fouling treatment, but is not limited thereto.

[0050] The material of the main body layer 114 is not particularly limited. In some embodiments, the material of the main body layer 114 can be a thermoplastic resin having good transparency, mechanical strength, thermal stability, moisture barrier properties and other properties. In some embodiments, the thermoplastic resin may include a cellulose resin (e.g., triacetate cellulose (TAC), diacetate cellulose (DAC)), an acrylic resin (e.g., poly(methyl methacrylate), PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, an oriented-polypropylene (OPP), polyethylene (PE), polypropylene (PP), a cyclic olefin polymer (COP), a cyclic olefin copolymer (COC), a polycarbonate (PC), or any combination thereof. In addition, the material of the main layer 114 may also be, for example, a (meth)acrylic, urethane, acrylic urethane, epoxy, silicone or other thermosetting resin or UV curable resin.

[0051] In certain embodiments, adhesive layer 116 comprises pressure sensitive adhesive (PSA), heat sensitive adhesive, solvent volatile adhesive and UV curable adhesive. In certain embodiments, pressure sensitive adhesive comprises natural rubber, synthetic rubber, styrene block copolymer, (meth) acrylic acid block copolymer, polyvinyl ether, polyolefin and poly (meth) acrylate. In certain embodiments, (meth) acrylic acid (or acrylate) refers to both acrylic acid and methacrylic acid. In other embodiments, pressure sensitive adhesive comprises (meth) acrylate, rubber, thermoplastic elastomer, polysilicone, urethane and combination thereof. In certain embodiments, pressure sensitive adhesive is based on (meth) acrylic acid pressure sensitive adhesive or based on at least one poly (meth) acrylate.

[0052] In some embodiments, the thickness of the surface protection film 110 may be 5 to 90 micrometers, preferably 35 to 80 micrometers.

[0053] Figure 3 Another exemplary surface protection film 110' is shown. The surface protection film 110' includes a surface treatment layer 112', a main body layer 114, and an adhesive layer 116'. Figure 2 The difference between the surface protection film 110 shown is that the magnetic substance 118' is included in the surface treatment layer 112', while the adhesive layer 116' does not include the magnetic substance 118'. Other similarities are not repeated here.

[0054] Although not shown in the figure, the structure of the polarizer 120 can include multiple film layers, such as a first protective layer, a polarizer, and a second protective layer from top to bottom, but is not limited thereto. For example, the first and / or second protective layer can be omitted, or other optical film layers can be added.

[0055] In some embodiments, the material of the polarizer can be a polyvinyl alcohol (PVA) resin film, which can be made by saponifying polyvinyl acetate resin. The saponification degree of the polyvinyl alcohol resin is generally about 85 mol% or more. In some embodiments, the thickness of the polarizer is 5 to 35 microns, preferably 20 to 30 microns.

[0056] In some embodiments, the material of the first protective layer and the second protective layer may be, for example, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc. In some embodiments, the material of the first protective layer and the second protective layer may be selected from the materials of the surface protection film described above. In some embodiments, the thickness of the first protective layer and the second protective layer may be independently 5 to 90 microns, preferably 35 to 80 microns.

[0057] In some embodiments, the polarizing plate may further include an adhesive layer located between the first protective film and the polarizer, and between the second protective film and the polarizer. The adhesive layer may include a water-based adhesive or an ultraviolet curable adhesive.

[0058] Please refer again Figure 1 According to some embodiments, the polarizing plate 100 may further include a release film 130 disposed on the polarizer 120. The release film 130 may have a structure and features known in the technical field of the present invention, and the details thereof will not be repeated here.

[0059] Please refer to Figure 4 , which shows an exemplary process of attaching a polarizing plate. Figures 5A-5B to Fig. 9 , which shows the various stages of the exemplary method of attaching a polarizing plate.

[0060] like Figures 5A-5B As shown, in step S10, a biasing fixture 200 is provided. The biasing fixture 200 includes a soft film 210. In some embodiments, the soft film 210 of the biasing fixture 200 includes holes (not shown in the figure). According to some embodiments, the biasing fixture 200 may further include a base 220. The soft film 210 may be disposed on the base 220. For example, the biasing fixture 200 may further include an airtight film 230, the soft film 210 is disposed in an opening in the center of the airtight film 230, and is fixed to the base 220 by the airtight film 230. In some embodiments, the base 220 and the soft film 210 (optionally together with the airtight film 230) form an air extraction cavity 240.

[0061] like Figures 6A-6B As shown, in step S20, a polarizing plate 100 is disposed on the soft film 210 of the polarizing fixture 200. The polarizing plate 100 includes a surface protection film 110, a polarizer 120, and a release film 130, wherein the surface protection film 110 includes a plurality of magnetic materials (118, 118'), the polarizer 120 is located on the surface protection film 110, and the release film 130 is located on the polarizer 120.

[0062] like Figures 7A-7BAs shown, in step S30, a sticky stick 250 is set on the release film 130 of the polarizing plate 100. And, in step S40, a magnet 260 is set at a position corresponding to the sticky stick 250 below the soft film 210 of the polarizing fixture 200, and the polarizing plate 100 is adsorbed on the soft film 210 by magnetic adsorption force. In some embodiments, the magnetic force of the magnet 260 used to adsorb the polarizing plate 100 is above 2500 Gauss. In some embodiments, the magnet 260 can be an electromagnet, and its voltage can be controlled to change the adsorption force on the polarizing plate 100, and the magnetic force can be turned off when not needed, so as to facilitate the operation. According to some embodiments, the method of attaching the polarizing plate can further include: evacuating the vacuum chamber 240 to adsorb the polarizing plate 100 on the soft film 210 by vacuum adsorption force. In this case, the polarizing plate 100 is simultaneously subjected to the action of magnetic force and vacuum adsorption force, which is more conducive to its fixation, and / or the required magnetic force can be appropriately reduced.

[0063] like Figure 8 As shown, in step S50 , the release film 130 is torn off using the adhesive stick 250 . Fig. 9 The state after the release film 130 is torn off is shown. According to some embodiments, after the release film 130 is torn off, the surface protection film of the present invention contains magnetic material, so that the warpage of the polarizing plate 100 can be increased from less than 20 mm to less than 30 mm, which meets the general requirement of attaching the polarizing plate 100 to the display panel later.

[0064] It should be understood that, although not shown in the accompanying drawings, the method of attaching the polarizing plate may further include attaching the polarizing plate 100 to a display panel after removing the release film 130 .

[0065] Relevant experiments on magnetic adsorption used in the above-mentioned attachment method are also provided here to enhance the understanding of the present invention.

[0066] Fig.10 Schematic diagram of an experimental configuration for magnetic adsorption. A warped polarizing plate 310 is used, and iron powder 330 is attached to it with one or more layers of double-sided tape 320, and a release film 340 is attached on top. A magnet 350 is used for magnetic adsorption, and a ruler 360 is used to measure the distance at which the double-sided tape 320 and the magnet 350 can be adsorbed.

[0067] Fig.11 This is an experimental result diagram of magnetic adsorption. Fig.11It can be seen that when the number of magnets 350 increases, the magnetic force provided is stronger, and the distance at which the double-sided tape 320 and the magnet 350 can be adsorbed is farther. In addition, when the number of double-sided tapes 320 increases, the iron powder 330 contained is more, and the distance at which the double-sided tape 320 and the magnet 350 can be adsorbed is also roughly increased. When the content of iron powder 330 relative to the area of ​​double-sided tape 320 is 0.03 g / cm 3 In the above (not shown in the figure), the magnetic force is above 2500 Gauss. Adsorption can be achieved. When three double-sided tapes 320 are used with a 4300 Gauss magnet, magnetic adsorption can be achieved even if the double-sided tape 320 and the magnet 350 are 2.5 cm apart.

[0068] In summary, the present invention provides a process of a polarizing plate and a method for attaching a polarizing plate, which can be applied in a panel factory that manufactures display panels. The traditional polarizing process only fixes the polarizing plate through vacuum adsorption force. Therefore, when the release film is torn off, the polarizer and the surface protective film underneath are easily brought up together. Even if the entire film does not fall off due to vacuum breaking, it is easy to cause the tail end of the polarizing plate to bend too high, and may further cause the problem of polarizing bubbles on both sides of the polarizing plate. In contrast, the present invention adds magnetic material to the polarizing plate and uses magnetic force to assist adsorption in the attachment process, which can solve or at least alleviate the above problems. Furthermore, since the present invention adds magnetic material to the surface protective film, and the surface protective film will be replaced when the panel factory ships the module later, it will not affect the subsequent assembly in the system factory.

[0069] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. A person skilled in the art of the present invention may make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A method for attaching a polarizing plate, characterized in that: include: A biasing fixture is provided, the biasing fixture comprising a soft film; A polarizing plate is disposed on the soft film of the polarizing fixture, wherein the polarizing plate includes a surface protection film, a polarizer, and a release film, wherein the surface protection film includes a surface treatment layer, a main body layer disposed on the surface treatment layer, and an adhesive layer disposed on the main body layer, and a plurality of magnetic materials are coated with 0.001 g / mm 3 The above content is distributed in the entire surface treatment layer or in the entire adhesive layer, the polarizer is located on the surface protection film, and the release film is located on the polarizer; Disposing a stick on the release film of the polarizing plate; Disposing a magnet at a position corresponding to the adhesive rod below the soft film of the polarizing fixture, and adsorbing the polarizing plate onto the soft film by magnetic adsorption force; and Use the stick to peel off the release film.

2. The method for attaching a polarizing plate according to claim 1, wherein: The magnetic substances are magnetic powder or magnetic ceramic material.

3. The method for attaching a polarizing plate according to claim 1, wherein: The soft film of the polarizing fixture includes holes, and the polarizing fixture further includes a base, and the base and the soft film form an air extraction cavity, wherein the method of attaching the polarizing plate further includes: The vacuum chamber is evacuated to adsorb the polarizing plate onto the soft film by vacuum adsorption force.

4. The method for attaching a polarizing plate according to claim 1, wherein: The magnetic force of the magnet used to adsorb the polarizing plate is above 2500 Gauss.

5. The method for attaching a polarizing plate according to claim 1, wherein: After the release film is torn off, the warping degree of the polarizing plate is less than 30 mm.

6. The method for attaching a polarizing plate according to claim 1, wherein: Also includes: After the release film is torn off, the polarizing plate is attached to a display panel.

7. The method for attaching a polarizing plate according to claim 2, wherein: The magnetic powders are iron powder, cobalt powder or nickel powder; and / or the magnetic ceramic materials are ferrite magnets.

8. The method for attaching a polarizing plate according to claim 1, wherein: The magnetic materials are anisotropic iron oxide powders.

9. The method for attaching a polarizing plate according to any one of claims 1 to 8, characterized in that: The polarizer is arranged on the surface protection film, wherein the adhesive layer of the surface protection film is used for bonding the polarizer and the surface protection film.

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