TWI815389B - Optical film structure - Google Patents

Abstract

The present disclosure provides an optical film structure, a method of evaluating an optical film structure, and a method of manufacturing a display device. The optical film structure includes an optical film, a surface protective film, and a release film. The optical film has a first surface and a second surface opposite to the first surface. The surface protective film is on the first surface of the optical film. The release film is on the second surface of the optical film. A coefficient of static friction between the surface protective film and the release film is equal to or less than 0.4.

Description

Optical film structure

The present disclosure relates to an optical film structure, an evaluation method of the optical film structure, and a display manufacturing method.

Polarizing plates are optical components widely used in displays. As displays become more and more widely used, for example, in mobile phones, wearable devices, etc., the quality requirements for polarizing plates are getting higher and higher.

In some embodiments, the present disclosure provides an optical film structure, which includes an optical film, a surface protection film and a release film. The optical film has a first surface and a second surface opposite to the first surface. The surface protection film is located on the first surface of the optical film. The release film is located on the second surface of the optical film. The static friction coefficient of at least one of the surface protection film and the release film relative to the other is equal to or less than 0.4.

In some embodiments, the present disclosure provides a method for evaluating an optical film structure, which includes: attaching a first optical film structure to a bearing surface of a ramp mechanism; disposing a second optical film structure on the first optical film structure , and make the first surface of the second optical film structure contact the first The surface of an optical film structure; adjusting the 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 the inclination angle of the bearing surface; and using the inclination angle as an indicator to evaluate the first optical film structure Adhesion characteristics between the film structure and the second optical film structure.

In some embodiments, the present disclosure provides a manufacturing method for a display, which includes: providing a plurality of optical film structures stacked on each other; evaluating the optical film structures using the aforementioned optical film structure evaluation method; and from the optical film structures Pick one of them and place it on the display panel.

1: Monitor

10,10',10A,10B,10C: Optical film structure

20:Display panel

50:Slope 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: steps

θ1, θ2: angle

In order to make the features and advantages of the present disclosure more obvious and understandable, different embodiments are given below and described in detail with reference to the accompanying drawings. It should be noted that various features in the drawings are not drawn to actual scale and are for illustrative purposes only. In fact, the dimensions of various elements in the drawings can be arbitrarily enlarged or reduced according to practical applications to clearly demonstrate the characteristics 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.

Figure 2 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.

Figure 3 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.

4 is a schematic diagram of an optical film structure according to some embodiments of the present disclosure.

FIG. 5 is a flowchart of a method for evaluating an optical film structure according to some embodiments of the present disclosure.

6A to 6B are schematic diagrams of evaluation methods of optical film structures according to some embodiments of the present disclosure.

7A, 7B, 7C, 7D and 7E are some implementations in accordance with the present disclosure. A flow chart of the manufacturing method of the display according to the embodiment.

The following disclosure provides many different embodiments or examples to illustrate different components of embodiments of the present disclosure. Specific examples of components and their arrangements in this specification will be disclosed below to simplify the description of this disclosure. Of course, these specific examples are not intended to limit the disclosure. For example, if the disclosure below in this specification describes that the first component is formed on or above the second component, it means that it includes the embodiment in which the first component and the second component are in direct contact, and also includes the embodiment in which the first component and the second component are formed in direct contact. Additional components may be formed between the first component and the second component, in which case the first component and the second component are not in direct contact. In addition, various examples in the description of this disclosure may use repeated reference symbols and/or words. The purpose of these repeated symbols or words is to simplify and clarify the present disclosure, but not to limit the relationship between the various embodiments and/or the described configurations.

Furthermore, in order to conveniently describe the relationship between one element or part and another element or part in the drawings, spatially relative terms may be used, such as "under", "below", "lower", "Above", "upper" and similar terms. In addition to the orientation depicted in the diagrams, spatially relative terms also encompass different orientations of structures or devices in use or operation. When the structure or device is rotated to a different orientation (for example, rotated 90 degrees or other orientations), the spatially relative adjectives used therein will also be interpreted according 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 3% of a given value or range. Within %, or within 2%, or within 1%, or within 0.5%. It should be noted that the quantities provided in the instructions are approximate quantities, that is, without specifically stating "approximately", "approximately", and "approximately", "approximately", "approximately", "approximately" may still be implied. "Probably" meaning.

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 the static friction coefficient between the surface protection film and the release film is equal to or less than 0.4. In this way, Then multiple optical film structures (or polarizing plate structures) can be stacked on top of each other without sticking problems. Furthermore, in the evaluation method of optical film structures, two optical film structures can be stacked on the bearing surface of the slope mechanism, and the inclination of the bearing surface can be adjusted until one of the optical film structures starts to fall off from the other and stops. At this time, the inclination angle of the bearing surface is used as an indicator to evaluate the adhesion characteristics between optical film structures. There is no need to use complex specifications or instruments. The adhesion between optical film structures can be obtained through a simple slide test. Characteristic test results. Examples of optical film structures will be described in further detail below.

Please refer to FIG. 1 , which 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 protection film 200 and a release film 300.

In some embodiments, optical film 100 has surface 101 and surface 102, surface 101 opposite surface 102. In some embodiments, the optical film 100 includes a polarizer, an optical property adjustment film, or a combination thereof. In some embodiments, the structure of optical film 100 may include multiple film layers. In some embodiments, the optical film 100 includes an optical functional film 110, protective layers 120 and 130, and adhesive layers 140 and 150. However, the structure of the present disclosure is not limited thereto. For example, the protective layer 120 and/or the protective layer may be omitted. layer 130, or add other optically functional films.

In some embodiments, optically functional film 110 may include polarized photons. In some embodiments, the material of the polarizer can be polyvinyl alcohol (PVA) resin, which can be produced by saponifying polyvinyl acetate resin. The degree of saponification of polyvinyl alcohol-based resin is usually about 85 mol% or more. Examples of polyvinyl acetate resins include monopolymers of vinyl acetate (i.e., polyvinyl acetate), as well as copolymers of vinyl acetate and others that can be combined with vinyl acetate. Monomers that can be copolymerized. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, ethyl acrylate, propyl n-acrylate, methyl methacrylate), olefins (e.g., ethylene, propylene , 1-butene, 2-methylpropylene), vinyl ethers (for example, ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acid (for example, vinyl Sulfonic acid, sodium vinyl sulfonate), etc. Specific examples of the copolymer of vinyl acetate and other monomers copolymerizable therewith include ethylene-vinyl acetate copolymers and the like. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000. The polyvinyl alcohol-based resin can be modified, for example, polyvinyl methylal, polyvinyl acetal, polyvinyl butyral, etc. modified with aldehydes can be used. In some embodiments, the thickness of the optically functional film 110 is about 5-35 microns (μm), preferably about 20-30 μm.

In some embodiments, the material of the protective layers 120 and 130 may be, for example, a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc. The thermoplastic resin may include acetyl cellulose resin (for example: triacetate cellulose (TAC), diacetate cellulose (DAC)), acrylic resin (for example: polymethylmethacrylate (polymethylmethacrylate) (methyl methacrylate, PMMA), polyester resin (for example, polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cyclic olefin resin, Oriented-polypropylene (OPP), polyethylene (PE), polypropylene (PP), cyclic olefin polymer (COP), cyclic olefin copolymer (cyclic olefin copolymer (COC), polycarbonate (PC), or any combination of the above. In addition, the material of the protective layers 120 and 130 can also be, for example, the following thermosetting resin or ultraviolet curing resin: (Methyl ) Acrylic, urethane (for example, polyurethane (PU)), acrylic amine Formate type (for example, polyacrylic urethane), epoxy type (for example, epoxy resin), polysilicone type (for example, polysilicone resin), etc. In addition, the protective layers 120 and 130 may be further subjected to surface treatment, such as anti-glare treatment, anti-reflection treatment, hard coating treatment, antistatic treatment or anti-fouling treatment. In addition, in some embodiments, the protective layers 120 and 130 are a single-layer or multi-layer optical film. In some embodiments, the thicknesses of the protective layers 120 and 130 may independently range from about 5 to 90 microns, preferably from about 35 to 80 microns.

In some embodiments, the adhesive layer 140 is located between the protective layer 120 and the optically functional film 110 , and the adhesive layer 150 is located between the protective layer 130 and the optically functional film 110 . The adhesive layers 140 and 150 may include a water-based adhesive. Generally, polyvinyl alcohol-based resin or urethane resin is used as the main component of the water-based adhesive. In order to improve the adhesion, isocyanate-based compounds or cyclic compounds may be added. A composition made of a cross-linking agent or a hardening compound such as an oxygen compound. In some embodiments, when the main component of the water-based adhesive is polyvinyl alcohol resin, in addition to partially saponified polyvinyl alcohol and fully saponified polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, acetyl-modified polyvinyl alcohol, etc. Modified polyvinyl alcohol-based resins such as denatured polyvinyl alcohol, hydroxymethyl-denatured polyvinyl alcohol, and amino-modified polyvinyl alcohol. This type of aqueous solution of polyvinyl alcohol resin can be used as a water-based adhesive, and the concentration of the polyvinyl alcohol resin in the water-based adhesive is usually 1 to 10 parts by mass relative to 100 parts by mass of water. 5 parts by mass is better. In some embodiments, in order to improve the adhesion as mentioned above, polyvalent aldehydes, water-soluble epoxy resins, melamine compounds, and zirconium oxide may be added to the water-based adhesive composed of an aqueous solution of polyvinyl alcohol resin. It is a hardening compound like a compound and a zinc compound.

In some embodiments, the adhesive layers 140 and 150 can be ultraviolet curing adhesives, and the materials can include, for example: acrylic adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, Polyvinyl alcohol-based adhesives, polyolefin-based adhesives, modified polyolefins Adhesives, polyvinyl alkyl ether adhesives, rubber adhesives, vinyl chloride-vinyl acetate adhesives, SEBS (styrene-ethylene-butylene-styrene copolymer) adhesives, ethylene- Ethylene-based adhesives such as styrene copolymer, acrylate-based adhesives such as ethylene-methyl (meth)acrylate copolymer, and ethylene-ethyl (meth)acrylate copolymer, etc.

In some embodiments, surface protection film 200 is located on surface 101 of optical film 100 . In some embodiments, the static friction coefficient of the surface protection film 200 relative to the release film 300 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.

Based on the current demand for thinner products, it is often necessary to reduce the thickness of polarizers. Although this may lead to insufficient rigidity of the polarizer structure during processing, the rigidity of the overall structure can be improved by thickening the surface protective film. (Since the surface protection film will eventually be removed and will not exist in the product, it will not have a negative impact on the thinning of the product and is only used to improve the structural rigidity of the polarizer during processing); however, thickened surface protection The film may be difficult to tear off during processing. Although this problem can be solved by reducing the adhesion between the surface protection film and the polarizing plate, it may cause the finished polarizing plate structure to warp over time. If the curve is too small, it will easily cause sticking, making subsequent processing difficult. According to some embodiments of the present disclosure, when the static friction coefficient of the surface protection film 200 relative to the release film 300 meets the above conditions, multiple optical film structures 10 (or polarizing plate structures) can be stacked on each other without sticking. problem. In this way, even if the surface protection film 200 in the optical film structure 10 has a large thickness and the adhesion force between the surface protection film 200 and the optical film 100 is low, the warpage of the optical film structure 10 over time is relatively low. The optical film structure 10 still has the advantage of being sufficiently rigid, and the surface protection film 200 can be easily removed in subsequent processes, and can be stacked on top of each other without sticking, so it has good processability.

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 is located between the surface 101 of the optical film 100 and the surface structure 220. In some embodiments, the surface structure 220 has a coefficient of static friction relative to the release film 300 of about 0.4 or less, about 0.3 or less, about 0.2 or less, or about 0.1 or less.

In some embodiments, the surface structure 220 is made of a different material than the surface protective layer 210 . In some embodiments, the surface structure 220 may be an additionally produced or formed surface structure film layer, which is formed by disposing or producing an additional film layer on the surface protection layer 210 . In some embodiments, the surface structure 220 includes a resin material, such as a thermosetting resin or an ultraviolet curing resin. In some embodiments, the thermosetting resin of the surface structure 220 may include a urethane system (e.g., polyurethane (PU)), an acrylic urethane system (e.g., polyacrylic amine formate), acrylic styrene-based, polysilicone-based (for example, polysilicone resin), polysiloxane-based, fluororesin-based, etc. In some embodiments, the ultraviolet resin of the surface structure 220 may include a mixture of monomers, oligomers, and polymers of various resins such as acrylic, urethane, and epoxy resins. In some embodiments, surface structure 220 may further include greater than about 2.5 wtt% slip. In some embodiments, the surface structure 220 includes about 5 to 30 wt% lubricant. In some embodiments, the lubricant may include fatty acid amide, fatty acid ester, polysiloxane lubricant, fluorine-based lubricant, wax-based lubricant, or any combination of the above.

According to some embodiments of the present disclosure, the resin material of the surface structure 220 includes polysiloxane, polysiloxane, and/or fluororesin, or the surface structure 220 further includes a lubricant, which can increase the smoothness of the surface structure 220. This helps to reduce the surface static friction of the surface structure 220 . Furthermore, according to some embodiments of the present disclosure, the content of the lubricant has a critical impact on the characteristics of the surface structure 220 . When the lubricant content is higher than 30wt%, it may cause The light transmittance of the surface structure 220 is reduced, or the surface printability of the surface structure 220 is poor. When the content of the lubricant is less than 5 wt%, the surface static friction of the surface structure 220 may be too high, and the problem of sheet sticking in subsequent processing cannot be effectively solved.

In some embodiments, the surface structure 220 may be formed by surface treatment on the outer surface of the surface protection film 200 . In some embodiments, the surface structure 220 may include sandblasted microstructures, 3D printing material layers, screen printing layers, vector printing, UV curable adhesive layers, or any combination of the above.

In some embodiments, surface structure 220 has a thickness of about 1 micron or less, about 0.5 microns or less, or about 0.2 microns or less. In some embodiments, the surface structure 220 has a thickness of about 0.05-1 micron, about 0.1-1 micron, about 0.05-0.5 micron, about 0.05-0.2 micron, or about 0.2-0.5 micron. In some embodiments, the overall thickness of the surface protection layer 210 and the surface structure 220 may be greater than 35 microns, or equal to or greater than 50 microns, preferably 50 to 90 microns. 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 has the above range, the sticking problem can be avoided and the optical film structure 10 can be provided with sufficient rigidity, thereby greatly improving the optical properties of the film. Processability of membrane structure 10.

In some embodiments, the material of the surface protection film 200 (or the surface protection layer 210) may be a thermoplastic resin with good transparency, mechanical strength, thermal stability, moisture barrier properties, and other properties. In some embodiments, the thermoplastic resin may include cellulose resins (eg, triacetylcellulose (TAC), diacetylcellulose (DAC)), acrylic resins (eg, polymethyl methacrylate (PMMA), poly Ester resin (for example, polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cyclic olefin resin, oriented polypropylene (OPP), polyethylene (polyethylene, PE), polypropylene (PP), cyclic olefin polymer (COP), cycloolefin copolymer (COC), polycarbonate (PC), or any combination of the above. In addition, the material of the surface protection film 200 (or the surface protection layer 210) may also be, for example, (meth)acrylic, urethane, acrylic urethane, epoxy, or polysilicon. Oxygen-based thermosetting resin or ultraviolet curing resin. In addition, the above-mentioned surface protection film 200 (or surface protection layer 210) may be further subjected to surface treatment, such as anti-glare treatment, anti-reflection treatment, hard coating treatment, antistatic treatment or anti-fouling treatment.

In some embodiments, release film 300 is located on surface 102 of optical film 100 . In some embodiments, the static friction coefficient 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 include polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyarylate, polyester resin, olefin resin, acetic acid Cellulose resin, acrylic resin, polyethylene (PE), polypropylene (PP), cycloolefin 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 is located between the surface protection film 200 and the optical film 100 , and the adhesive layer 500 is located between the release film 300 and the optical film 100 . In some embodiments, the adhesive layers 400 and 500 include pressure sensitive adhesive (PSA), heat sensitive adhesive, solvent volatile adhesive, and/or UV curable adhesive. In some embodiments, the pressure-sensitive adhesive may include natural rubber, synthetic rubber, styrene block copolymer, (meth)acrylic block copolymer, polyvinyl ether, polyolefin, and/or poly( Meth)acrylate. In some embodiments, (meth)acrylic (or acrylate) refers to both acrylic and methacrylic. In some embodiments, pressure-sensitive adhesives may include (meth)acrylates, rubbers, thermoplastic elastomers, silicones, urethanes, and combinations thereof. In some embodiments, the pressure-sensitive adhesive is based on (a acrylic pressure-sensitive adhesive or based on at least one poly(meth)acrylate.

In some embodiments, the 2-week warpage value of the optical film structure 100 is equal to or less than about 23 millimeters (mm), equal to or less than about 18 mm, equal to or less than about 16 mm, or equal to or less than about 9 mm. . In some embodiments, the optical film structure 100 has a 4-week warp value over time of about 20 millimeters or less, about 13 millimeters or less, about 10 millimeters or less, or about 2 millimeters or less. In some embodiments, the 2-week warpage value of the optical film structure 100 is about 8 to 23 mm, about 12 to 20 mm, or about 15 to 18 mm. In some embodiments, the 4-week warpage value of the optical film structure 100 is about 1 to 20 mm, about 5 to 15 mm, or about 10 to 12 mm.

Please refer to FIG. 2 , which is a schematic diagram of an optical film structure 10A according to some embodiments of the present disclosure. In some embodiments, optical film structure 10A has a structure similar to optical film structure 10 , with the differences described below. In addition, from now on in this document, the same or similar component numbers as the aforementioned components will be used with the same or similar component numbers. Please refer to the above description for the relevant description of the same or similar components and will not be repeated here.

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 to 90 microns.

In some embodiments, the release film 300 may include a release layer 310 and a surface structure 320. The release layer 310 is located between the surface 102 of the optical film 100 and the surface structure 320. In some embodiments, the static friction coefficient of the surface structure 320 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 surface structure 320 is made of a different material than the release layer 310 . In some embodiments, the surface structure 320 may be an additionally produced or formed surface structure film layer, which is formed by disposing or producing an additional film layer on the release layer 310 . In some embodiments , the surface structure 320 includes a resin material, such as thermosetting resin or ultraviolet curing resin. In some embodiments, the thermosetting resin of the surface structure 320 may include a urethane system (e.g., polyurethane (PU)), an acrylic urethane system (e.g., polyacrylic amine formate), acrylic styrene-based, polysilicone-based (for example, polysilicone resin), polysiloxane-based, fluororesin-based, etc. In some embodiments, the ultraviolet resin of the surface structure 320 may include a mixture of monomers, oligomers, and polymers of various resins such as acrylic, urethane, and epoxy resins. In some embodiments, surface structure 320 may further include greater than about 2.5 wt% lubricant. In some embodiments, the surface structure 320 includes about 5 to 30 wt% lubricant. In some embodiments, the lubricant may include fatty acid amide, fatty acid ester, polysiloxane lubricant, fluorine-based lubricant, wax-based lubricant, or any combination of the above.

According to some embodiments of the present disclosure, the resin material of the surface structure 320 includes polysiloxane, polysiloxane, and/or fluororesin, or the surface structure 320 further includes a lubricant, which can increase the smoothness of the surface structure 320. This helps to reduce the surface static friction of the surface structure 320 . Furthermore, according to some embodiments of the present disclosure, the content of the lubricant has a critical impact on the characteristics of the surface structure 320 . When the content of the lubricant is higher than 30 wt%, the light transmittance of the surface structure 320 may be reduced, or the surface printability of the surface structure 320 may be poor. When the content of the lubricant is less than 5wt%, the surface static friction of the surface structure 320 may be too high, and the problem of sheet sticking in subsequent processing cannot be effectively solved.

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 sufficient rigidity of the optical film structure 10A, while the release film 300 can have a relatively large thickness. The design of the shaped film 300 can effectively avoid the sticking problem, thereby greatly improving the processability of the optical film structure 10A.

In some embodiments, the surface structure 320 is permeable to the outer side of the release film 300 The surface is formed by surface treatment. In some embodiments, the surface structure 320 may include sandblasted microstructures, 3D printing material layers, screen printing layers, vector printing, UV curable adhesive layers, or any combination of the above.

In some embodiments, surface structure 320 has a thickness of about 1 micron or less, about 0.5 microns or less, or about 0.2 microns or less. In some embodiments, the surface structure 320 has a thickness of about 0.05-1 micron, about 0.1-1 micron, about 0.05-0.5 micron, about 0.05-0.2 micron, or about 0.2-0.5 micron.

In some embodiments, the release layer 310 may include polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyarylate, polyester resin, olefin resin, acetic acid Cellulose resin, acrylic resin, polyethylene (PE), polypropylene (PP), cycloolefin resin or a combination of the above.

Please refer to FIG. 3 , which 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, and the differences are as follows.

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.

Please refer to FIG. 4 , which is a schematic diagram of an optical film structure 10C according to some embodiments of the present disclosure. In some embodiments, the optical film structure 10C has a structure similar to the optical film structure 10 , the optical film structure 10A, and/or the optical film structure 10B, with the differences described below.

In some embodiments, neither the surface protection film 200A nor the release film 300A of the optical film structure 10C includes additionally formed surface structures. In some embodiments, the surface protection film 200A and the release film 300A include silicone-containing resin, fluorine-containing resin, or a combination thereof. In some practical In the embodiment, the surface protection film 200A and the release film 300A are formed by selecting appropriate materials, so that the static friction coefficient of the surface protection film 200A relative to the release film 300A 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.

Please refer to FIG. 5 , FIG. 6A and FIG. 6B . FIG. 5 is a flow chart of an evaluation method of an optical film structure according to some embodiments of the present disclosure. FIG. 6A and FIG. 6B are a flow chart of an optical film structure according to some embodiments of the present disclosure. Schematic diagram of the assessment method. As shown in Figure 5, the evaluation method of the optical film structure may include the following steps: attach the first optical film structure to the bearing surface of the ramp mechanism (step S10); arrange the second optical film structure on the first optical film structure on, and make the first surface of the second optical film structure contact the surface of the first optical film structure (step S20); adjust the inclination of the bearing surface until the second optical film structure starts to fall off from the first optical film structure and stops, and Measure the inclination angle of the bearing surface (step S30); and use the inclination angle as an index to evaluate the adhesion characteristics between the first optical film structure and the second optical film structure (step S40).

Referring to FIG. 5 and FIG. 6A , in step S10 , the optical film structure 10 can be bonded to the bearing surface 510 of the ramp mechanism 50 . In some embodiments, the optical film structure 10 can be fixed on the bearing surface 510 of the ramp mechanism 50 . In some embodiments, the optical film structure 10 includes an optical film 100, a surface protection film 200 and a release film 300. The optical film structure 10 can be fixed on the bearing surface 510 of the ramp mechanism 50 with the release film 300 facing upward. In some other embodiments, the optical film structure 10 can also be fixed on the bearing surface 510 of the ramp mechanism 50 with the surface protection film 200 facing upward.

Next, please refer to FIGS. 5 and 6A . In step S20 , the optical film structure 10 ′ can be disposed on the optical film structure 10 , and the surface 201 ′ of the optical film structure 10 ′ contacts 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 an optical film 100, a surface protection film 200 and a release film 300. The optical film structure 10' can represent The surface protection film 200 is disposed on the optical film structure 10 in a downward facing manner. In some other embodiments, the release film 300 can also be disposed on the optical film structure 10 with the release film 300 facing downward.

In some embodiments, in step S20 , the surface 201 ′ of the surface protection film 200 of the optical film structure 10 ′ is made to contact 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 known as the "starting angle") relative to the horizontal plane. The angle θ1 allows the optical film structure 10' to rest on the optical film structure 10 without causing any damage. Loose or slipped.

In some embodiments, in step S20, the optical film structure 10' has a surface 301' relative to the surface 201', and the surface of the optical film structure 10' can be adjusted before adjusting the inclination of the bearing surface 510 (step S30). 301' is attached to the surface 601 of the hard substrate 60. In some embodiments, the surface 301 ′ of the optical film structure 10 ′ is completely located within the surface 601 of the hard substrate 60 . In some embodiments, the hard substrate 60 is, for example, a glass plate. According to some embodiments of the present disclosure, the hard substrate 60 can improve the overall structural flatness of the optical film structure 10', so that the surface 201' of the optical film structure 10' can fully contact the optical film structure 10 in the subsequent testing step (step S30). surface, thereby obtaining more consistent and accurate measurement data, reducing errors and improving the reliability of the evaluation method.

Next, please refer to FIG. 5 and FIG. 6B. In step S30, the inclination of the bearing surface 510 can be adjusted until the optical film structure 10' starts to fall off (or loosen) from the optical film structure 10 and stops, and the bearing at this time is measured. The inclination angle of surface 510 is θ2. In some embodiments, the inclination angle θ2 of the bearing surface 510 is measured when the relative positions of the surface 201 ′ of the optical film structure 10 ′ and the surface 301 of the optical film structure 10 begin to change. In some embodiments, the inclination angle θ2 of the bearing surface 510 is greater than the starting angle θ1 . In some embodiments, the optical film structure 10' is formed from an optical film structure Before the optical film structure 10 falls off (or becomes loose), 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. 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 optical film structure in step S30. 10 surface, thereby obtaining more consistent and accurate measurement data, reducing errors and improving the reliability of the evaluation method.

Next, please refer to FIG. 5 . In step S40 , the inclination angle θ2 can be used as an index to evaluate the adhesion characteristics between the optical film structure 10 and the optical film structure 10 ′.

In some embodiments, the static friction force of the surface 301 of the optical film structure 10 relative to the surface 201' of the optical film structure 10' increases as the inclination angle θ2 of the bearing surface 510 increases. In some embodiments, the static friction coefficient of the surface 301 of the optical film structure 10 relative to the surface 201' of the optical film structure 10' increases as the inclination angle 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 surface of the optical film structure 10 (eg, surface 301) relative to a surface of the optical film structure 10' (eg, surface 201'). The static friction force, the static friction coefficient of the surface of the optical film structure 10 (eg, surface 301) relative to the surface of the optical film structure 10' (eg, surface 201'), or a combination of the above.

In some embodiments, the adhesion characteristics between the optical film structure 10 and the optical film structure 10' may include static friction and/or the surface protection film 200 of the optical film structure 10 relative to the release film 300 of the optical film structure 10'. Static friction coefficient, static friction force and/or static friction coefficient of the release film 300 of the optical film structure 10 relative to the surface protective film 200 of the optical film structure 10', and static friction coefficient of the surface protective film 200 of the optical film structure 10 relative to the optical film structure 10' The static friction force and/or static friction coefficient of the surface protection film 200, the static friction force and/or 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 of the above.

In some embodiments, according to the tilt angle θ2 and the lookup table (lookup table) to evaluate the adhesion characteristics between the optical film structure 10 and the optical film structure 10'. In some embodiments, the lookup table includes a relationship between the tilt angle θ2 and the static friction force, a relationship between the tilt angle θ2 and the static friction coefficient, or a combination thereof.

In some embodiments, the tilt angle θ2 may be equal to or smaller than a specific numerical range as an indicator. In some embodiments, the tilt angle θ2 may be equal to or less than 25 degrees as an indicator. In some embodiments, when the tilt angle θ2 meets the conditions of the above indicators, 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 prone to sticking.

The adhesion characteristics of samples with various optical film structures (polarizers) are tested below. The tilt angle θ2 of the bearing surface, the static friction coefficient between the two optical film structures, and the results of the adhesive sheet test evaluation are shown in Table 1 below. . Thus, the inclination angle θ2 of the bearing surface can be used as an indicator to evaluate the adhesion characteristics of the optical film structure.

(1) Static friction coefficient test: Use the JIS K7152 specification to measure the static friction between optical film structures. The first optical film structure is placed on the glass substrate with the release film facing upward, and then the second optical film structure is placed on the glass substrate. The film structure uses the surface protection film facing downward as the sliding surface to contact the release film of the first optical film structure below, and a load of 200 grams is placed above the second optical film structure, and then the load is continued at 100 mm/min. The speed causes the sliding surface to move in the horizontal direction, and the static friction force between the two optical film structures is measured, and then the static friction coefficient is calculated based on the static friction force and load. In the following examples and comparative examples, the surface protective film of the optical film structure contains a surface structure, and the surface structure of the surface protective film of each optical film structure contains different contents of lubricant (polyether modified silicone, Shin-Etsu Chemical KP- 105 additives). The method for making the surface structure is as follows: mix acrylic resin with lubricant and cross-linking agent in different weight proportions, stir for about 30 minutes and then mix thoroughly. Next, provide a transparent film with a thickness of 38 microns, a width of 20 centimeters, and a length of 30 centimeters. Polyethylene terephthalate (PET) film, and use a rod coater to coat the above mixture on the PET film, and then heat it at 100°C for 5 minutes to dry, and then form a surface structure after the drying is completed.

(2) Measurement of the inclination angle θ2 of the bearing surface: Use an initial tack tester as a slope mechanism for testing, in which the first optical film structure is cut into a size of 20 cm * 30 cm, and the second optical film is The structure is cut into a size of 8 cm * 8 cm (weight is about 1.23 grams), and then the first optical film structure sample is glued to the slope of the test instrument (the load-bearing surface of the slope mechanism) with the release film facing upwards. , and attach the second optical film structure sample to a glass plate with a thickness of 0.5 mm and a size of 10 cm * 1 cm (the weight of the glass plate is approximately 16.65 grams), and then place the second optical film structure sample (whole Weighing about 17.88 grams) was attached to the first optical film structure sample on the slope with the surface protective film facing down and the glass plate facing up. Next, adjust the inclination angle of the slope of the testing instrument (the bearing surface of the slope mechanism), and record the inclination angle θ2 of each set of optical film structures when they loosen and slide.

(3) Adhesion sheet test evaluation: Cut the optical film structure sample into a size of 13.3 inches (295.76 mm*168.24 mm). After stacking 50 optical film structure samples, place the 50 stacked optical film structure samples into an aluminum foil bag. Evacuate and then place in an environment with a temperature of 25°C/humidity of 55% for two weeks to simulate the time elapsed after packaging is completed and shipped to the customer. Next, open the aluminum foil bag and take out 50 stacked optical film structures, place the surface protection film side up, use a vacuum cleaner to suck the uppermost optical film structure and move it upward to confirm the adhesion status of the sheets. If the top single optical film structure can be successfully absorbed in a single suction operation, it will be judged as passing "○". If more than two optical film structures can be sucked up in a single suction operation, it will be judged as failing "×".

It can be seen from the results in Table 1 that the content of the lubricant has a key influence on the static friction coefficient, thereby affecting the sticking situation of the optical film structure. In addition, it can be seen from the results in Table 1 that different tilt angles θ2 can correspond to different static friction coefficients, so that the adhesion results of the optical film structure can be judged. Therefore, according to some embodiments of the present disclosure, using the tilt angle θ2 as an indicator to evaluate the adhesion characteristics between optical film structures does not require the use of complex specifications or instruments. For example, there is no need to measure static friction or static friction coefficient. The adhesion characteristics test results between optical film structures can be obtained through a simple sliding test.

7A, 7B, 7C, 7D and 7E are flowcharts of a manufacturing method of 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 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, among 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 properties of the optical film structure 10 can be evaluated by the evaluation method described in the embodiments of the present disclosure, and the optical film structures 10 that pass the adhesion property test are stacked on each other. In some embodiments, the adhesion of the optical film structure 10 may be evaluated upon completion. After adhesion characteristics are obtained, the optical film structures 10 that pass the adhesion characteristics test are stacked on each other. In some embodiments, the optical film structure 100 has a 2-week warpage value of about 23 mm or less, about 18 mm or less, about 16 mm or less, or about 9 mm or less. In some embodiments, the optical film structure 100 has a 4-week warp value over time of about 20 millimeters or less, about 13 millimeters or less, about 10 millimeters or less, or about 2 millimeters or less. In some embodiments, the 2-week warpage value of the optical film structure 100 is about 8 to 23 mm, about 12 to 20 mm, or about 15 to 18 mm. In some embodiments, the 4-week warpage value of the optical film structure 100 is about 1 to 20 mm, about 5 to 15 mm, or about 10 to 12 mm.

As shown in FIG. 7B , one optical film structure 10 may be picked up from a plurality of stacked optical film structures 10 . In some embodiments, the uppermost optical film structure 10 can be picked up by the suction device 70 . In some embodiments, the uppermost optical film structure 10 among the stacked optical film structures 10 can be sucked by a vacuum suction device 70 . In some embodiments, the vacuum picker of the suction device 70 can pick up the optical film structure 10 by vacuum suctioning 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 can 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 can be removed. In some embodiments, the optical film structure 10 is temporarily fixed on the suction device 70 through vacuum adsorption, and the release film 300 is removed from the optical film structure 10 through the tearing device 80 . According to some embodiments of the present disclosure, since the optical film structure 10 is sufficiently rigid, when the release film 300 is removed, the optical film structure 10 will not be pulled to cause vacuum damage and cause the optical film structure 10 to fall off from the suction device 70 .

As shown in FIG. 7D , the optical film 100 can be bonded to the display panel 20 . exist In some embodiments, the optical film 100 is still temporarily fixed on the suction device 70 through the surface protection film 200 , and the optical film 100 can be attached to the display panel 20 by moving the suction device 70 . In some embodiments, the display panel 20 may be a liquid crystal display panel, such as an IPS liquid crystal display panel or a VA liquid crystal display panel. In some embodiments, display panel 20 may be an OLED panel.

As shown in FIG. 7E , the suction device 70 can be moved away from the surface protection film 200 . In some embodiments, the surface protection film 200 can be removed to form the display 1 including the optical film 100 and the display panel 20 .

Although the disclosure is disclosed in the foregoing embodiments, this is not intended to limit the disclosure. Those with ordinary knowledge in the technical field to which this disclosure belongs may make slight changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the scope of the appended patent application. In addition, each claimed scope constitutes an independent embodiment, and combinations of various claimed scopes and embodiments are within the scope of the present disclosure.

10: Optical film structure

100: Optical film

101,102: Surface

110: Optical functional film

120,130:Protective layer

140,150: Adhesive layer

200:Surface protective film

210: Surface protective layer

220:Surface structure

300: Release film

400,500: Adhesive layer

Claims (8)

An optical film structure includes: an optical film having a first surface and a second surface relative to the first surface, wherein the optical film includes polarized photons; a surface protection film located on the third surface of the optical film on a surface, wherein the surface protection film includes thermosetting resin or ultraviolet curing resin; and a release film located on the second surface of the optical film, wherein at least one of the surface protection film and the release film A static friction coefficient of one relative to the other is equal to or less than 0.4, wherein: the surface protective film includes a surface protective layer and a surface structure, and the static friction coefficient of the surface structure relative to the release film is equal to or less than 0.4 , and the surface structure includes about 5~20wt% lubricant, and/or the surface structure includes sandblasting microstructure, 3D printing material layer, screen printing layer, vector printing, UV curing adhesive layer, or any combination of the above. The optical film structure of claim 1, wherein the surface protection layer is located between the first surface of the optical film and the surface structure. The optical film structure of claim 1, wherein the release film includes a release layer and a surface structure, the release layer is located between the second surface of the optical film and the surface structure, and the surface structure is relative to The static friction coefficient of the surface protective film is equal to or less than 0.4. The optical film structure of claim 2 or 3, wherein the material of the surface structure of the surface protection film is different from the material of the surface protection layer, and/or the material of the surface structure of the release film is different from the material of the release layer. Materials are different. The optical film structure of claim 2 or 3, wherein the thickness of the surface structure of the surface protection film is equal to or less than 1 micron (μm), and/or the thickness of the surface structure of the release film is equal to or less than 1 Micron. The optical film structure of claim 2 or 3, wherein the surface structure of the surface protection film includes about 5~30wt% lubricant, and/or the surface structure of the release film includes about 5~30wt% lubricant. . The optical film structure of claim 1, wherein at least one of the surface protection film and the release film includes a silicone-containing resin, a fluorine-containing resin, or a combination of the above. For example, the optical film structure of claim 1, wherein the warpage value of the optical film structure over 2 weeks is 8 to 23 mm, and/or the warpage value of the optical film structure over 4 weeks is 1 to 20 mm.

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