CN119471870A - Evaluation method of optical film structure and manufacturing method of display - Google Patents
Evaluation method of optical film structure and manufacturing method of display Download PDFInfo
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- CN119471870A CN119471870A CN202411625633.1A CN202411625633A CN119471870A CN 119471870 A CN119471870 A CN 119471870A CN 202411625633 A CN202411625633 A CN 202411625633A CN 119471870 A CN119471870 A CN 119471870A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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Abstract
The present disclosure relates to a method for evaluating an optical film structure and a method for manufacturing a display. The present disclosure provides an optical film structure, an evaluation method of the optical film structure, and a manufacturing method of a display. The optical film structure comprises an optical film, a surface protection film and a release film. The optical film has a first surface and a second surface opposite the first surface. The surface protection film is positioned on the first surface of the optical film. The release film is positioned on the second surface of the optical film. At least one of the surface protective film and the release film has a static friction coefficient of 0.4 or less with respect to the other.
Description
Information about the divisional application
The scheme is a divisional application. The parent of the division is the patent application of the invention with the application date of 2022, 04 month and 01, the application number of 202210347377.9, the invention name of 'optical film structure, evaluation method of optical film structure and manufacturing method of display'.
Technical Field
The disclosure relates to an optical film structure, an evaluation method of the optical film structure, and a manufacturing method of a display.
Background
Polarizing plates are optical components widely used in displays, and as the applications of displays are becoming wider, for example, mobile phones, wearable devices, etc., the requirements for the quality of the polarizing plates are also becoming higher.
Disclosure of Invention
In some embodiments, the present disclosure provides an optical film structure comprising an optical film, a surface protection film, and a release film. The optical film has a first surface and a second surface opposite the first surface. The surface protection film is positioned on the first surface of the optical film. The release film is positioned on the second surface of the optical film. At least one of the surface protective film and the release film has a static friction coefficient of 0.4 or less with respect to the other.
In some embodiments, the disclosure provides a method for evaluating an optical film structure, comprising attaching a first optical film structure to a bearing surface of a slope mechanism, disposing a second optical film structure on the first optical film structure with a first surface of the second optical film structure contacting a surface of the first optical film structure, adjusting a tilting degree of the bearing surface until the second optical film structure starts to fall off from the first optical film structure and measuring a tilting angle of the bearing surface, and evaluating an adhesion property between the first optical film structure and the second optical film structure with the tilting angle as a pointer.
In some embodiments, the present disclosure provides a method of manufacturing a display device, comprising providing a plurality of optical film structures stacked on each other, evaluating the optical film structures by the evaluation method of the optical film structures, and picking up one of the optical film structures to be attached to a display panel.
Drawings
In order to make the features and advantages of the present disclosure more comprehensible, various embodiments accompanied with figures are described in detail below. It should be noted that the various features in the drawings are not drawn to actual scale and are merely illustrative. In fact, the dimensions of the various elements in the drawings may be arbitrarily increased or reduced depending on the application to clearly display the features of the embodiments of the present disclosure.
Fig. 1 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.
Fig. 2 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.
Fig. 3 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.
Fig. 4 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.
Fig. 5 is a flow chart of a method of evaluating an optical film structure according to some embodiments of the present disclosure.
Fig. 6A-6B are schematic diagrams of methods of evaluating optical film structures according to some embodiments of the present disclosure.
Fig. 7A, 7B, 7C, 7D, and 7E are flowcharts of methods of manufacturing displays according to some embodiments of the present disclosure.
Detailed Description
The following disclosure provides many different embodiments, or examples, to demonstrate different components of the embodiments of the present disclosure. Specific examples of components and arrangements thereof are disclosed below to simplify the description of the present disclosure. Of course, these specific examples are not intended to limit the disclosure. For example, if the following disclosure describes forming a first feature on or over a second feature, it is intended to include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features may be formed between the first and second features, such that the first and second features are not in direct contact. Furthermore, various examples in the description of the present disclosure may use repeated reference characters and/or words. These repeated symbols or words are intended to simplify and clarify the present disclosure and are not intended to limit the relationship between the various embodiments and/or configurations described.
Moreover, for convenience in describing the relationship of one component or element to another component(s) or element(s) in the drawings, spatially relative terms such as "under", "lower", "upper" and the like may be used. Spatially relative terms may be used for different orientations of the structure or device in use or operation in addition to the orientation depicted in the figures. When the structure or device is turned to a different orientation (e.g., rotated 90 degrees or other orientations), the spatially relative descriptors used herein interpreted as being turned to the rotated orientation.
As used herein, the terms "about", "approximately" and "approximately" generally mean within 20%, preferably within 10%, and more preferably within 5%, or within 3%, or within 2%, or within 1%, or within 0.5% of a given value or range. It should be noted that the numbers provided in the specification are about numbers, i.e., without a specific recitation of "about", "approximately", and "approximately", the meaning of "about", "approximately" may still be implied.
Embodiments of the present disclosure provide an optical film structure and an evaluation method thereof, wherein the optical film structure includes a surface protection film and a release film, and a static friction coefficient between the surface protection film and the release film is equal to or less than 0.4, so that a plurality of optical film structures (or polarizing plate structures) can be stacked on each other without a problem of adhesion. In addition, in the method for evaluating the optical film structures, two optical film structures can be stacked on the bearing surface of the slope mechanism, the inclination degree of the bearing surface is adjusted until one of the optical film structures starts to fall off from the other one, and the inclination angle of the bearing surface is used as a pointer to evaluate the adhesion characteristic between the optical film structures, so that a complex standard or instrument is not required, and the adhesion characteristic test result between the optical film structures can be obtained only through a simple sliding test. Embodiments of optical film structures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic diagram of an optical film structure 10 according to some embodiments of the present disclosure. The optical film structure 10 includes an optical film 100, a surface protective film 200, and a release film 300.
In some embodiments, optical film 100 has a surface 101 and a surface 102, surface 101 being opposite surface 102. In some embodiments, the optical film 100 comprises a polarizing plate, an optical property adjustment film, or a combination thereof. In some embodiments, the structure of the optical film 100 may include a variety of film layers. In some embodiments, the optical film 100 includes the optical functional film 110, the protection layers 120 and 130, and the adhesive layers 140 and 150, but the structure of the disclosure is not limited thereto, for example, the protection layer 120 and/or the protection layer 130 may be omitted, or other optical functional films may be added.
In some embodiments, the optical functional film 110 may include a bias photon. In some embodiments, the material of the bias element may be a polyvinyl alcohol (polyvinyl alcohol, PVA) based resin, which may be made by saponifying a polyvinyl acetate resin. The saponification degree of the polyvinyl alcohol resin is generally about 85 mol% or more. Examples of the polyvinyl acetate resin include a single polymer of vinyl acetate (i.e., polyvinyl acetate), and copolymers of vinyl acetate and other monomers copolymerizable with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, ethyl acrylate, n-propyl acrylate, methyl methacrylate), olefins (e.g., ethylene, propylene, 1-butene, 2-methylpropene), vinyl ethers (e.g., ethylvinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (e.g., vinylsulfonic acid, sodium vinylsulfonate), and the like. Specific examples of the copolymer of vinyl acetate and other monomer copolymerizable therewith include ethylene-vinyl acetate copolymers and the like. The polymerization degree of the polyvinyl alcohol resin is usually about 1000 to 10000, preferably about 1500 to 5000. The polyvinyl alcohol resin may be modified, and for example, polyvinyl methylal, polyvinyl acetal, polyvinyl butyral, or the like modified with an aldehyde may be used. In some embodiments, the thickness of the optically functional film 110 is about 5 to 35 micrometers (μm), preferably about 20 to 30 micrometers.
In some embodiments, the material of the protective layers 120 and 130 may be, for example, thermoplastic resins excellent in transparency, mechanical strength, thermal stability, moisture barrier property, and the like. The thermoplastic resin may include an acetyl cellulose resin (e.g., triacetyl cellulose (TRIACETATE CELLULOSE, TAC), diacetyl cellulose (DIACETATE CELLULOSE, DAC)), an acrylic resin (e.g., polymethyl methacrylate (poly (methyl methacrylate), PMMA)), a polyester resin (e.g., polyethylene terephthalate (polyethylene terephthalate, PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, a oriented polypropylene (OPP), a Polyethylene (PE), a polypropylene (PP), a cycloolefin polymer (cyclic olefin polymer, COC), a cycloolefin copolymer (cyclic olefin copolymer, COC), a polycarbonate (polycarbonate, PC), or any combination thereof, and the materials of the protective layers 120 and 130 may be, for example, a thermosetting resin or an ultraviolet-curable resin such as (meth) acrylic, urethane (e.g., polyurethane (PU)), an acrylic urethane (e.g., polyacrylic) or epoxy (e.g., epoxy), a silicone, a single-layer or a multi-layer anti-glare treatment such as an anti-glare treatment is performed on the surface of the protective layer 120, the anti-glare treatment may be performed in addition to the anti-glare treatment, the thickness of the protective layers 120 and 130 may be independently about 5 to 90 microns, preferably about 35 to 80 microns.
In some embodiments, the adhesive layer 140 is located between the protective layer 120 and the optical functional film 110, and the adhesive layer 150 is located between the protective layer 130 and the optical functional film 110. The adhesive layers 140 and 150 may contain an aqueous adhesive, and generally, for example, a polyvinyl alcohol resin or a urethane resin is used as a main component of the aqueous adhesive, and may be a composition prepared by adding a crosslinking agent such as an isocyanate compound or an epoxy compound or a curable compound to improve the adhesion. In some embodiments, when the main component of the aqueous adhesive is a polyvinyl alcohol resin, a modified polyvinyl alcohol resin such as a carboxyl modified polyvinyl alcohol, an acetyl modified polyvinyl alcohol, a hydroxymethyl modified polyvinyl alcohol, and an amino modified polyvinyl alcohol may be used in addition to a partially saponified polyvinyl alcohol and a completely saponified polyvinyl alcohol. The aqueous solution of the polyvinyl alcohol resin may be used as an aqueous adhesive, and the concentration of the polyvinyl alcohol resin in the aqueous adhesive is usually 1 to 10 parts by mass, preferably 1 to 5 parts by mass, relative to 100 parts by mass of water. In some examples, a curable compound such as polyvalent aldehyde, a water-soluble epoxy resin, a melamine compound, a zirconia compound, and a zinc compound may be added to the aqueous adhesive agent composed of an aqueous solution of a polyvinyl alcohol resin in order to improve the adhesion as described above.
In some embodiments, the adhesive layers 140 and 150 may be ultraviolet curable adhesives, and examples of materials include acrylic adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, polyvinyl alcohol adhesives, polyolefin adhesives, modified polyolefin adhesives, polyvinyl alkyl ether adhesives, rubber adhesives, vinyl chloride-vinyl acetate adhesives, SEBS (styrene-ethylene-butylene-styrene copolymer) adhesives, vinyl adhesives such as ethylene-styrene copolymer, and acrylic acid ester adhesives such as ethylene-methyl (meth) acrylate copolymer and ethylene-ethyl (meth) acrylate copolymer.
In some embodiments, the surface protective film 200 is located on the surface 101 of the optical film 100. In some embodiments, the surface protective film 200 has a static coefficient of friction with respect to the release film 300 of equal to or less than about 0.4, equal to or less than about 0.3, equal to or less than about 0.2, or equal to or less than about 0.1.
Based on the current demand of thinning the product, it is often required to correspondingly reduce the thickness of the polarizing plate, which may lead to the problem of insufficient rigidity of the polarizing plate structure during the processing, but the thickness of the surface protection film is thickened to improve the rigidity of the whole structure (the surface protection film is eventually removed and is not present in the product, so that the product is not adversely affected, and only used for improving the rigidity of the polarizing plate structure during the processing), however, the thickened surface protection film may be difficult to tear during the processing, and the problem can be solved by reducing the adhesive force between the surface protection film and the polarizing plate, but the warping of the manufactured polarizing plate structure with time is too small, which may lead to easy occurrence of sticky sheets, and the subsequent processing is not easy. According to some embodiments of the present disclosure, when the static friction coefficient of the surface protection film 200 with respect to the release film 300 satisfies the above condition, a plurality of optical film structures 10 (or polarizing plate structures) may be stacked on each other without a sticking problem. In this way, even if the surface protection film 200 in the optical film structure 10 has a larger thickness and the adhesion between the surface protection film 200 and the optical film 100 is low, so that the warp of the optical film structure 10 with time is relatively low, the optical film structure 10 still has the advantages of being sufficiently rigid, easily tearing off the surface protection film 200 in the subsequent process, and stacking each other without the occurrence of sticking, thus having good workability.
In some embodiments, the surface protection film 200 may include a surface protection layer 210 and a surface structure 220, the surface protection layer 210 being located between the surface 101 of the optical film 100 and the surface structure 220. In some embodiments, the surface structure 220 has a static coefficient of friction with respect to the release film 300 of equal to or less than about 0.4, equal to or less than about 0.3, equal to or less than about 0.2, or equal to or less than about 0.1.
In some embodiments, the material of the surface structure 220 is different from the material of the surface protection layer 210. In some embodiments, the surface structure 220 may be an additional fabricated or formed surface structure film layer formed by disposing or fabricating an additional film layer on the surface protection layer 210. In some embodiments, the surface structure 220 comprises a resin material, such as a thermosetting resin or an ultraviolet curable resin. In some embodiments, the thermosetting resin of the surface structure 220 may include urethane (e.g., polyurethane (PU)), acrylic urethane (e.g., polyacrylate urethane), acrylic styrene, silicone (e.g., silicone resin), polysilazane, fluororesin, and the like. In some embodiments, the ultraviolet-based resin of the surface structure 220 may comprise a mixture of monomers, oligomers, polymers of various resins, such as acrylic, urethane, epoxy, and the like. In some embodiments, the surface structure 220 may further comprise greater than about 2.5wt% slip agent. In some embodiments, the surface structure 220 comprises about 5 to 30wt% slip agent. In some embodiments, the slip agent may comprise a fatty acid amide, a fatty acid ester, a silicone-based lubricant, a fluorine-based lubricant, a wax-based lubricant, or any combination of the foregoing.
According to some embodiments of the present disclosure, the resin material of the surface structure 220 may include a silicone system, a polysilazane system, and/or a fluororesin system, or the surface structure 220 may further include a slip agent, which may increase the smoothness of the surface structure 220, thereby helping to reduce the surface static friction of the surface structure 220. Furthermore, according to some embodiments of the present disclosure, the amount of slip agent has a critical impact on the characteristics of the surface structure 220. When the content of the slip agent is more than 30wt%, there is a possibility that the light transmittance of the surface structure 220 is lowered or the surface printability of the surface structure 220 is poor. When the content of the slip agent is less than 5wt%, the surface static friction of the surface structure 220 may be too high to effectively solve the problem of the subsequent processing of the adhesive sheet.
In some embodiments, the surface structure 220 may be formed by surface-treating the outer side surface of the surface protection film 200. In some embodiments, the surface structure 220 may comprise a sandblasted microstructure, a 3D printed material layer, a screen printed layer, a stamp, an ultraviolet cured glue layer, or any combination thereof.
In some embodiments, the thickness of the surface structure 220 is equal to or less than about 1 micron, equal to or less than about 0.5 microns, or equal to or less than about 0.2 microns. In some embodiments, the thickness of the surface structure 220 is about 0.05 to 1 micron, about 0.1 to 1 micron, about 0.05 to 0.5 micron, about 0.05 to 0.2 micron, or about 0.2 to 0.5 micron. In some embodiments, the thickness of the overall thickness of the surface protection layer 210 and the surface structure 220 may be greater than 35 micrometers, or equal to or greater than 50 micrometers, and preferably 50-90 micrometers. According to some embodiments of the present disclosure, when the surface protection film 200 has the surface protection layer 210 and the surface structure 220 and the overall thickness is within the above range, the adhesion problem can be avoided and the sufficient rigidity of the optical film structure 10 can be provided, thereby greatly improving the processability of the optical film structure 10.
In some embodiments, the material of the surface protective film 200 (or the surface protective layer 210) may be a thermoplastic resin having good transparency, mechanical strength, thermal stability, moisture barrier property, and the like. In some embodiments, the thermoplastic resin may include a cellulose resin (e.g., cellulose Triacetate (TAC), cellulose Diacetate (DAC)), an acrylic resin (e.g., polymethyl methacrylate (PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cyclic olefin resin, oriented stretch polypropylene (OPP), polyethylene (PE), polypropylene (PP), cyclic Olefin Polymer (COP), cyclic Olefin Copolymer (COC), polycarbonate (PC), or any combination thereof, the material of the surface protective film 200 (or the surface protective layer 210) may be, for example, a thermosetting resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone, or an ultraviolet-curable resin, and the surface protective film 200 (or the surface protective layer 210) may be further subjected to a surface treatment such as an anti-glare treatment, an anti-reflection treatment, a hard coat treatment, an electrification preventing treatment, or an anti-staining treatment.
In some embodiments, release film 300 is located on surface 102 of optical film 100. In some embodiments, the coefficient of static friction of the release film 300 relative to the surface protective film 200 is equal to or less than about 0.4, equal to or less than about 0.3, equal to or less than about 0.2, or equal to or less than about 0.1. In some embodiments, the release film 300 may comprise polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyaramid, polyester resin, olefin resin, cellulose acetate resin, acrylic resin, polyethylene (PE), polypropylene (PP), cyclic olefin resin, or a combination of the above.
In some embodiments, the optical film structure 10 may further include adhesive layers 400 and 500, the adhesive layer 400 being located between the surface protection film 200 and the optical film 100, and the adhesive layer 500 being located between the release film 300 and the optical film 100. In some embodiments, the adhesive layers 400 and 500 include Pressure Sensitive Adhesives (PSA), heat sensitive adhesives, solvent volatile adhesives, and/or UV curable adhesives. In some embodiments, the pressure sensitive adhesive may comprise natural rubber, synthetic rubber, styrene block copolymers, (meth) acrylic block copolymers, polyvinyl ethers, polyolefins, and/or poly (meth) acrylates. In some embodiments, (meth) acrylic (or acrylate) refers to both acrylic and methacrylic. In some embodiments, the pressure sensitive adhesive may comprise (meth) acrylates, rubbers, thermoplastic elastomers, silicones, urethanes, and combinations thereof. In some embodiments, the pressure sensitive adhesive is based on a (meth) acrylic pressure sensitive adhesive or on at least one poly (meth) acrylate.
In some embodiments, the optical film structure 100 has a warp value over time of about 23 millimeters (mm) or less, about 18 mm or less, about 16 mm or less, or about 9mm or less. In some embodiments, the optical film structure 100 has an over-time 4-week warp value of equal to or less than about 20 millimeters, equal to or less than about 13 millimeters, equal to or less than about 10 millimeters, or equal to or less than about 2 millimeters. In some embodiments, the optical film structure 100 has a warp value of about 8 to 23 millimeters, about 12 to 20 millimeters, or about 15 to 18 millimeters over time. In some embodiments, the optical film structure 100 has a 4-week warp value of about 1-20 millimeters, about 5-15 millimeters, or about 10-12 millimeters over time.
Referring to fig. 2, fig. 2 is a schematic diagram of an optical film structure 10A according to some embodiments of the present disclosure. In some embodiments, the structure of the optical film structure 10A is similar to the optical film structure 10, with the differences described below. In addition, the same or similar components as those described above are denoted by the same or similar reference numerals, and reference is made to the foregoing for the description of the same or similar components, which is not repeated herein.
In some embodiments, the thickness of the surface protection film 200 may be greater than 35 microns, or equal to or greater than 50 microns, preferably 50-90 microns.
In some embodiments, release film 300 may include release layer 310 and surface structure 320, release layer 310 being located between surface 102 and surface structure 320 of optical film 100. In some embodiments, the surface structure 320 has a static coefficient of friction with respect to the surface protective film 200 of equal to or less than about 0.4, equal to or less than about 0.3, equal to or less than about 0.2, or equal to or less than about 0.1.
In some embodiments, the material of the surface structure 320 is different from the material of the release layer 310. In some embodiments, the surface structure 320 may be an additional fabricated or formed surface structure film layer formed by disposing or fabricating an additional film layer on the release layer 310. In some embodiments, the surface structure 320 comprises a resin material, such as a thermosetting resin or an ultraviolet curable resin. In some embodiments, the thermosetting resin of the surface structure 320 may include urethane (e.g., polyurethane (PU)), acrylic urethane (e.g., polyacrylate urethane), acrylic styrene, silicone (e.g., silicone resin), polysilazane, fluororesin, and the like. In some embodiments, the ultraviolet-based resin of the surface structure 320 may comprise a mixture of monomers, oligomers, polymers of various resins, such as acrylic, urethane, epoxy, and the like. In some embodiments, the surface structure 320 may further comprise greater than about 2.5wt% slip agent. In some embodiments, the surface structure 320 comprises about 5 to 30wt% slip agent. In some embodiments, the slip agent may comprise a fatty acid amide, a fatty acid ester, a silicone-based lubricant, a fluorine-based lubricant, a wax-based lubricant, or any combination of the foregoing.
According to some embodiments of the present disclosure, the resin material of the surface structure 320 may include a silicone, polysilazane, and/or fluororesin system, or the surface structure 320 may further include a slip agent, which may increase the smoothness of the surface structure 320, thereby helping to reduce the surface static friction of the surface structure 320. Furthermore, according to some embodiments of the present disclosure, the amount of slip agent has a critical impact on the characteristics of the surface structure 320. When the content of the slip agent is more than 30wt%, there is a possibility that the light transmittance of the surface structure 320 is lowered or the surface printability of the surface structure 320 is poor. When the content of the slip agent is less than 5wt%, the surface static friction of the surface structure 320 may be too high to effectively solve the problem of the subsequent processing of the adhesive sheet.
Furthermore, according to some embodiments of the present disclosure, since the release film 300 includes the release layer 310 and the surface structure 320, the surface protection film 200 can have a relatively large thickness to provide the optical film structure 10A with sufficient rigidity, and the design of the release film 300 can effectively avoid the sticking problem, so as to greatly improve the processability of the optical film structure 10A.
In some embodiments, the surface structures 320 may be formed by surface treating the outside surface of the release film 300. In some embodiments, the surface structure 320 may comprise a sandblasted microstructure, a 3D printed material layer, a screen printed layer, a stamp, an ultraviolet cured glue layer, or any combination thereof.
In some embodiments, the thickness of the surface structures 320 is equal to or less than about 1 micron, equal to or less than about 0.5 microns, or equal to or less than about 0.2 microns. In some embodiments, the surface structure 320 has a thickness of about 0.05 to 1 micron, about 0.1 to 1 micron, about 0.05 to 0.5 microns, about 0.05 to 0.2 microns, or about 0.2 to 0.5 microns.
In some embodiments, the release layer 310 may comprise polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyaramid, polyester resin, olefin resin, cellulose acetate resin, acrylic resin, polyethylene (PE), polypropylene (PP), cyclic olefin resin, or a combination thereof.
Referring to fig. 3, fig. 3 is a schematic diagram of an optical film structure 10B according to some embodiments of the present disclosure. In some embodiments, the structure of the optical film structure 10B is similar to the optical film structure 10 and/or the optical film structure 10A, with the differences described below.
In some embodiments, the surface protection film 200 of the optical film structure 10B includes a surface protection layer 210 and a surface structure 220, and the release film 300 includes a release layer 310 and a surface structure 320.
Referring to fig. 4, fig. 4 is a schematic diagram of an optical film structure 10C according to some embodiments of the present disclosure. In some embodiments, the structure of optical film structure 10C is similar to optical film structure 10, optical film structure 10A, and/or optical film structure 10B, with the differences described below.
In some embodiments, neither the surface protective film 200A nor the release film 300A of the optical film structure 10C includes an additionally formed surface structure. In some embodiments, the surface protective film 200A and the release film 300A comprise a silicone-containing resin, a fluorine-containing resin, or a combination thereof. In some embodiments, the surface protective film 200A and the release film 300A are formed by selecting suitable materials such that the surface protective film 200A has a static coefficient of friction with respect to the release film 300A of equal to or less than about 0.4, equal to or less than about 0.3, equal to or less than about 0.2, or equal to or less than about 0.1.
Referring to fig. 5, 6A and 6B, fig. 5 is a flowchart of an evaluation method of an optical film structure according to some embodiments of the present disclosure, and fig. 6A and 6B are schematic diagrams of an evaluation method of an optical film structure according to some embodiments of the present disclosure. As shown in FIG. 5, the method for evaluating the optical film structure may include the steps of attaching a first optical film structure to a bearing surface of a slope mechanism (step S10), disposing a second optical film structure on the first optical film structure with a first surface of the second optical film structure contacting a surface of the first optical film structure (step S20), adjusting a degree of inclination of the bearing surface until the second optical film structure starts to fall off from the first optical film structure and stops, and measuring an inclination angle of the bearing surface (step S30), and evaluating an adhesion property between the first optical film structure and the second optical film structure with the inclination angle as a pointer (step S40).
Referring to fig. 5 and 6A, in step S10, the optical film structure 10 may be attached to the carrying surface 510 of the ramp mechanism 50. In some embodiments, the optical film structure 10 may be secured to the bearing surface 510 of the ramp mechanism 50. In some embodiments, the optical film structure 10 includes the optical film 100, the surface protection film 200 and the release film 300, and the optical film structure 10 may be fixed on the carrying surface 510 of the ramp mechanism 50 with the release film 300 facing upwards. In some other embodiments, the optical film structure 10 may also be fixed on the bearing surface 510 of the ramp mechanism 50 with the surface protection film 200 facing upward.
Next, referring to fig. 5 and 6A, in step S20, the optical film structure 10' may be disposed on the optical film structure 10, and the surface 201' of the optical film structure 10' may be contacted with the surface 301 of the optical film structure 10. In some embodiments, similar to the optical film structure 10, the optical film structure 10 'includes the optical film 100, the surface protection film 200, and the release film 300, and the optical film structure 10' may be disposed on the optical film structure 10 with the surface protection film 200 facing downward. In some other embodiments, the release film 300 may be disposed on the optical film structure 10 in a downward direction.
In some embodiments, in step S20, the surface 201 'of the surface protection film 200 of the optical film structure 10' is brought into contact with the surface 301 of the release film 300 of the optical film structure 10. In some other embodiments, in step S20, the surface of the release film 300 of the optical film structure 10' may also be brought into contact with the surface of the surface protection film 200 of the optical film structure 10. In some embodiments, in step S20, the bearing surface 510 has an angle θ1 (also referred to as a "start angle") with respect to the horizontal plane, and the angle θ1 enables the optical film structure 10' to rest on the optical film structure 10 without loosening or sliding off.
In some embodiments, in step S20, the optical film structure 10' has a surface 301' opposite to the surface 201', and the surface 301' of the optical film structure 10' may be attached to the surface 601 of the hard substrate 60 before adjusting the inclination degree of the bearing surface 510 (step S30). In some embodiments, the surface 301 'of the optical film structure 10' is located entirely within the surface 601 of the rigid substrate 60. In some embodiments, the rigid substrate 60 is, for example, a glass plate. According to some embodiments of the present disclosure, the hard substrate 60 may improve the overall structural flatness of the optical film structure 10', so that the surface 201' of the optical film structure 10' may completely contact the surface of the optical film structure 10 in the subsequent testing step (step S30), thereby obtaining more consistent and accurate measurement data, reducing errors and improving reliability of the evaluation method.
Next, referring to fig. 5 and 6B, in step S30, the inclination degree of the supporting surface 510 may be adjusted until the optical film structure 10' is detached (or loosened) from the optical film structure 10, and the inclination angle θ2 of the supporting surface 510 is measured. In some embodiments, the tilt angle θ2 of the bearing surface 510 is measured when the relative position of the surface 201 'of the optical film structure 10' and the surface 301 of the optical film structure 10 starts to change. In some embodiments, the bearing surface 510 is inclined at an angle θ2 greater than the initial angle θ1. In some embodiments, the surface 201' of the optical film structure 10' is entirely within the range of the surface 301 of the optical film structure 10 before the optical film structure 10' is detached (or loosened) from the optical film structure 10. According to some embodiments of the present disclosure, the surface 201 'of the optical film structure 10' is completely located within the range of the surface 301 of the optical film structure 10, so that the surface 201 'of the optical film structure 10' can completely contact the surface of the optical film structure 10 in step S30, thereby obtaining more consistent and accurate measurement data, reducing errors and improving reliability of the evaluation method.
Next, referring to fig. 5, in step S40, the adhesion characteristic between the optical film structure 10 and the optical film structure 10' may be evaluated by using the inclination angle θ2 as a pointer.
In some embodiments, the static friction of the surface 301 of the optical film structure 10 relative to the surface 201 'of the optical film structure 10' increases as the angle of inclination θ2 of the bearing surface 510 increases. In some embodiments, the coefficient of static friction of the surface 301 of the optical film structure 10 relative to the surface 201 'of the optical film structure 10' increases as the angle of inclination θ2 of the bearing surface 510 increases.
In some embodiments, the adhesion characteristics between the optical film structure 10 and the optical film structure 10' may include a static friction force of a surface of the optical film structure 10 (e.g., surface 301) relative to a surface of the optical film structure 10' (e.g., surface 201 '), a static friction coefficient of a surface of the optical film structure 10 (e.g., surface 301) relative to a surface of the optical film structure 10' (e.g., surface 201 '), or a combination thereof.
In some embodiments, the adhesion characteristics between the optical film structure 10 and the optical film structure 10' may include a static friction force and/or a static friction coefficient of the surface protection film 200 of the optical film structure 10 relative to the release film 300 of the optical film structure 10', a static friction force and/or a static friction coefficient of the release film 300 of the optical film structure 10 relative to the surface protection film 200 of the optical film structure 10', a static friction force and/or a static friction coefficient of the surface protection film 200 of the optical film structure 10 relative to the surface protection film 200 of the optical film structure 10', a static friction force and/or a static friction coefficient of the release film 300 of the optical film structure 10 relative to the release film 300 of the optical film structure 10', or a combination thereof.
In some embodiments, the adhesion characteristics between the optical film structure 10 and the optical film structure 10' may be evaluated according to the tilt angle θ2 and a look-up table (look-up table). In some embodiments, the lookup table includes a relationship between the tilt angle θ2 and the static friction, a relationship between the tilt angle θ2 and the static friction coefficient, or a combination thereof.
In some embodiments, the inclination angle θ2 may be equal to or smaller than a certain numerical range as an index. In some embodiments, the inclination angle θ2 may be equal to or smaller than 25 degrees as an index. In some embodiments, when the inclination angle θ2 satisfies the above-mentioned condition, the optical film structures 10 and 10 'can pass the adhesion property test, which means that the optical film structures 10 and 10' are not easy to be adhered.
The following adhesion property test was performed on samples of various optical film structures (polarizing plates), in which the inclination angle θ2 of the bearing surface, the coefficient of static friction between the two optical film structures, and the results of the adhesive sheet test evaluation are shown in table 1 below. By this, the inclination angle θ2 of the bearing surface can be used as a pointer to evaluate the adhesion characteristics of the optical film structure.
(1) And testing the static friction coefficient, namely measuring the static friction force between the optical film structures by adopting JIS K7152 standard, wherein the first optical film structure is arranged on the glass substrate in a mode that a release film faces upwards, the second optical film structure is used as a sliding surface by taking a surface protection film as a sliding surface, the release film of the first optical film structure below is used for contacting, a load of 200 g is placed above the second optical film structure, then the sliding surface is moved in the horizontal direction at the speed of 100 mm/min, the static friction force between the two optical film structures is measured, and then the static friction coefficient is calculated according to the static friction force and the load. In the following examples and comparative examples, the surface protective films of the optical film structures contained surface structures, and the surface structures of the surface protective films of the respective optical film structures contained different amounts of a slip agent (polyether modified silicone, believed to be more chemical KP-105 additive). The surface structure is prepared by mixing acrylic resin with lubricant and crosslinking agent in different weight ratio, stirring for about 30min, and mixing thoroughly. Next, a transparent polyethylene terephthalate (PET) film having a thickness of 38 μm, a width of 20 cm and a length of 30 cm was provided, and the above mixture was coated on the PET film using a bar coater, and then dried by heating at 100 ℃ for 5 minutes, to thereby form a surface structure after the drying was completed.
(2) Measurement of the bearing surface tilt angle θ2 using a tack tester as the ramp mechanism, wherein a first optical film structure was cut to a size of 20 cm by 30 cm, a second optical film structure was cut to a size of 8 cm by 8 cm (weight of about 1.23 g), then the first optical film structure sample was adhered to the ramp of the test instrument with the release film facing upward (bearing surface of the ramp mechanism), and the second optical film structure sample was adhered to a glass plate having a thickness of 0.5 mm and a size of 10 cm by 1 cm (weight of the glass plate was about 16.65 g), and then the second optical film structure sample (overall weight of about 17.88 g) was adhered to the first optical film structure sample on the ramp with the surface protective film facing downward and the glass plate facing upward. Then, the inclination angle of the slope (bearing surface of the slope mechanism) of the test instrument is adjusted, and the inclination angle theta 2 when each group of optical film structures are loosened and slipped is recorded.
(3) Adhesive sheet test evaluation the optical film structure samples were cut to 13.3 inch (295.76 mm. 168.24 mm) size, after stacking 50 optical film structure samples, the 50 stacked optical film structure samples were placed in an aluminum foil bag and evacuated, and then placed in an environment at 25 ℃/humidity of 55% for two weeks to simulate the time elapsed after packaging was completed until shipping to the customer. Then, the aluminum foil pouch was opened to take out 50 stacked optical film structures, the surface protective film side was placed upward, and the uppermost optical film structure was sucked by a vacuum suction device and moved upward to confirm the state of the adhesive sheet. The single suction operation can successfully suck the uppermost single optical film structure and judge that the single suction operation passes through the optical film structure, and the single suction operation can suck more than two optical film structures and judge that the single suction operation does not pass through the optical film structure.
TABLE 1
| Content of slip agent (wt%) | Coefficient of static friction | Inclination angle theta 2 (degree) | Adhesive sheet test | |
| Example 1 | 20 | 0.17 | 10 | ○ |
| Example 2 | 10 | 0.21 | 20 | ○ |
| Example 3 | 5 | 0.33 | 25 | ○ |
| Comparative example 1 | 2.5 | 0.42 | 35 | × |
| Comparative example 2 | 0 | 0.55 | 45 | × |
From the results of table 1, it can be seen that the amount of slip agent has a critical effect on the coefficient of static friction, and thus on the adhesive sheet condition of the optical film structure. Further, as can be seen from the results of table 1, different inclination angles θ2 can correspond to different static friction coefficients, so that the adhesive sheet results of the optical film structure can be judged. Therefore, according to some embodiments of the present disclosure, the inclination angle θ2 is used as a pointer to evaluate the adhesion characteristics between the optical film structures, and thus, the adhesion characteristic test result between the optical film structures can be obtained through a simple sliding test without using complex specifications or instruments, such as without measuring static friction force or static friction coefficient.
Fig. 7A, 7B, 7C, 7D, and 7E are flowcharts of methods of manufacturing the display 1 according to some embodiments of the present disclosure.
As shown in fig. 7A, a plurality of optical film structures 10 stacked on top of each other may be provided. In some embodiments, each optical film structure 10 includes an optical film 100, a surface protection film 200, and a release film 300, and the optical film structures 10 are stacked with the surface protection film 200 facing upward. In some embodiments, in two adjacent optical film structures 10, the surface of the surface protection film 200 of one contacts the surface of the release film 300 of the other.
In some embodiments, the adhesion characteristics of the optical film structures 10 may be evaluated by the evaluation methods described in embodiments of the present disclosure, and the optical film structures 10 that pass the adhesion characteristic test may be disposed on top of each other. In some embodiments, the optical film structures 10 that pass the adhesion property test may be stacked on top of each other after the evaluation of the adhesion property of the optical film structures 10 is completed. In some embodiments, the optical film structure 100 has an over-time 2-week warp value of equal to or less than about 23 millimeters, equal to or less than about 18 millimeters, equal to or less than about 16 millimeters, or equal to or less than about 9 millimeters. In some embodiments, the optical film structure 100 has an over-time 4-week warp value of equal to or less than about 20 millimeters, equal to or less than about 13 millimeters, equal to or less than about 10 millimeters, or equal to or less than about 2 millimeters. In some embodiments, the optical film structure 100 has a warp value of about 8 to 23 millimeters, about 12 to 20 millimeters, or about 15 to 18 millimeters over time. In some embodiments, the optical film structure 100 has a 4-week warp value of about 1-20 millimeters, about 5-15 millimeters, or about 10-12 millimeters over time.
As shown in fig. 7B, one of the optical film structures 10 may be picked up from the stacked plurality of optical film structures 10. In some embodiments, the uppermost one of the optical film structures 10 may be picked up by the suction device 70. In some embodiments, the uppermost one 10 of the stacked optical film structures 10 may be sucked by a vacuum suction of the suction device 70. In some embodiments, the vacuum extractor of the suction device 70 may pick up the optical film structure 10 by vacuum-adsorbing the surface protection film 200 of the optical film structure 10. According to some embodiments of the present disclosure, since the optical film structures 10 have all passed the adhesion property test, they may be picked up individually for subsequent processing.
As shown in fig. 7C, the release film 300 of the optical film structure 10 on the suction device 70 may be peeled off. In some embodiments, the optical film structure 10 is temporarily secured to the suction device 70 by vacuum suction, and the release film 300 is peeled from the optical film structure 10 by the peeling device 80. According to some embodiments of the present disclosure, since the optical film structure 10 is sufficiently rigid, the release film 300 is not torn off from the suction device 70 due to vacuum failure caused by pulling on the optical film structure 10.
As shown in fig. 7D, the optical film 100 may be attached to the display panel 20. In some embodiments, the optical film 100 is still temporarily fixed on the suction device 70 through the surface protection film 200, and the suction device 70 can be moved to attach the optical film 100 to the display panel 20. In some embodiments, the display panel 20 may be a liquid crystal display panel, for example, an IPS liquid crystal display panel, or a VA liquid crystal display panel. In some embodiments, the display panel 20 may be an OLED panel.
As shown in fig. 7E, the suction device 70 may be removed from the surface protective film 200. In some embodiments, the surface protective film 200 may be removed to form the display 1 including the optical film 100 and the display panel 20.
While the present disclosure has been described with reference to the above embodiments, it is not intended to limit the disclosure. Those of ordinary skill in the art will appreciate that many modifications and variations are possible without departing from the spirit and scope of the disclosure. The scope of the disclosure is therefore intended to be defined only by the appended claims. Furthermore, each claim is to be construed as an independent embodiment, and various claims and combinations of embodiments are intended to be within the scope of the present disclosure.
Symbol description
1 Display device
10,10',10A,10B,10C optical film structure
20 Display panel
50 Ramp mechanism
60 Hard substrate
70 Suction device
80 Tear-off device
100 Optical film
101,102,201',301,301',601 Surface
110 Optical functional film
120,130 Protective layer
140,150 Adhesive layer
200,200A surface protective film
210 Surface protective layer
220,320 Surface structure
300,300A Release film
310 Release layer
400,500 Adhesive layer
510 Bearing surface
S10, S20, S30, S40 step
Θ1, θ2 angle
Claims (8)
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| CN202411625633.1A CN119471870A (en) | 2022-04-01 | 2022-04-01 | Evaluation method of optical film structure and manufacturing method of display |
| CN202210347377.9A CN114624795B (en) | 2022-04-01 | 2022-04-01 | Optical film structure, evaluation method of optical film structure, and manufacturing method of display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003334911A (en) * | 2002-05-21 | 2003-11-25 | Mitsubishi Polyester Film Copp | Display surface protecting film |
| US20060144514A1 (en) * | 2005-01-03 | 2006-07-06 | Yongcai Wang | Polarizing plate laminated with an improved glue composition and a method of manufacturing the same |
| JP2009025762A (en) * | 2007-07-24 | 2009-02-05 | Nitto Denko Corp | Optical film, polarizing plate and image display device |
| JP5723618B2 (en) * | 2011-02-04 | 2015-05-27 | 日東電工株式会社 | Adhesive sheet and surface protective film |
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