CN114460672A - Method for evaluating surface protective film, method for manufacturing optical film structure, and method for manufacturing display - Google Patents
Method for evaluating surface protective film, method for manufacturing optical film structure, and method for manufacturing display Download PDFInfo
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- CN114460672A CN114460672A CN202210177782.0A CN202210177782A CN114460672A CN 114460672 A CN114460672 A CN 114460672A CN 202210177782 A CN202210177782 A CN 202210177782A CN 114460672 A CN114460672 A CN 114460672A
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- surface protective
- protective film
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- warpage
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The present disclosure provides an evaluation method of a surface protective film, a manufacturing method of an optical film structure, and a manufacturing method of a display. The method for evaluating a surface protective film includes: attaching a surface protective film to a substrate; performing a slip measurement step, which comprises: stretching the surface protective film at a fixed tension for a predetermined time; measuring the slippage of the surface protection film relative to the substrate; and evaluating the warp property of the surface protective film with time by using the slip amount of the surface protective film relative to the substrate as an index.
Description
Technical Field
The present disclosure relates generally to a method of evaluating a surface protective film, a method of manufacturing an optical film structure, and a method of manufacturing a display, and more particularly, to a method of evaluating a surface protective film for warping (warping over time), a method of manufacturing an optical film structure, and a method of manufacturing a display.
Background
The polarizing plate is an optical component widely used in displays, and as the applications of the displays are wider and wider, for example, mobile phones, wearable devices, etc., the requirements for the quality of the polarizing plate are also higher and higher.
Disclosure of Invention
In some embodiments, the present disclosure provides a method of evaluating a surface protective film, comprising: attaching a surface protective film to a substrate; performing a slip measurement step, comprising: stretching the surface protective film at a fixed tension for a predetermined time; measuring the slippage of the surface protection film relative to the substrate; and evaluating the warp property of the surface protective film with time by using the slip amount of the surface protective film relative to the substrate as an index.
In some embodiments, the present disclosure provides a method of making an optical film structure, comprising: providing an optical film; evaluating the warp characteristics of the surface protective film with time by using the slip amount of the surface protective film relative to the substrate as an index, wherein the slip amount of the surface protective film relative to the substrate is measured after attaching the surface protective film to the substrate and stretching the surface protective film at a fixed tension for a predetermined time; and attaching the surface protection film to the optical film to form the optical film structure.
In some embodiments, the present disclosure provides a method of making an optical film structure, comprising: providing an optical film structure made according to the foregoing method of the present disclosure; and attaching the optical film structure to the 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 scale and are merely illustrative. In fact, the dimensions of the various elements in the figures may be arbitrarily expanded or reduced for clarity of presentation, depending on the application, to thereby characterize embodiments of the present disclosure.
Fig. 1 is a flow chart of a method of evaluating a surface protective film according to some embodiments of the present disclosure.
Fig. 2 is a graph of actual measurements of the relationship of the amount of slip of a surface protective film relative to a substrate to the warp over time (warp over time) characteristics of the surface protective film, according to some embodiments of the present disclosure.
Fig. 3A, 3B, 3C, and 3D are flow diagrams of methods of manufacturing optical film structures according to some embodiments of the present disclosure.
Detailed Description
The following disclosure provides many different embodiments, or examples, for illustrating different components of embodiments of the disclosure. Specific examples of components and arrangements thereof are disclosed below to simplify the present disclosure. Of course, these specific examples are not intended to limit the disclosure. For example, the following disclosure describes forming a first feature over or on a second feature, i.e., embodiments in which the formed first and second features are 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. Moreover, various examples in the description of the disclosure may use repeated reference characters and/or words. These repeated symbols or words are provided to simplify and clarify the disclosure and are not intended to limit the relationship between the various embodiments and/or the described configurations.
Also, spatially relative terms, such as "below …", "below", "lower", "above", "upper" and the like, may be used for convenience in describing the relationship of one element or component to another element(s) or component(s) in the figures. Spatially relative terms may also encompass different orientations of the structure or device in use or operation in addition to the orientation depicted in the figures. When a structure or device is turned to a different orientation (e.g., rotated 90 degrees or at other orientations), the spatially relative adjectives used herein will also be interpreted in terms of the turned orientation.
As used herein, the terms "about", "approximately", "substantial" 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 quantities provided in the specification are approximate quantities, i.e., the meanings of "about", "about" and "about" can be implied without specifying "about", "about" and "about".
Embodiments of the present disclosure provide a method for evaluating a surface protective film for an optical film structure (e.g., a polarizing plate), which includes performing a slip amount measuring step and evaluating a warp over time (warp over time) characteristic of the surface protective film using a slip amount of the surface protective film with respect to a substrate as an index, and embodiments of the method for evaluating a surface protective film will be described in further detail below. It should be understood that the parameters of the measurement method of the slip amount and the type of the warp characteristics with time described in the present disclosure are not limited to the following, and those skilled in the art can freely adjust the parameters and the type of the warp characteristics with time used in the slip amount measurement step.
Referring to fig. 1, fig. 1 is a flowchart of an evaluation method of a surface protection film according to some embodiments of the present disclosure. As shown in fig. 1, the method for evaluating a surface protective film may include the steps of: bonding a surface protective film to the substrate (step S11); performing a slip measurement step, which comprises: stretching the surface protective film at a fixed tension for a predetermined time and measuring a slip amount of the surface protective film with respect to the substrate (step S12); and evaluating the warp property of the surface protective film with time by using the slip amount of the surface protective film relative to the substrate as an index.
Referring to fig. 1, in step S11, a surface protection film may be attached to a substrate. In some embodiments, an optical film structure without a surface protection film (e.g., an optical film; or a polarizer without a surface protection film, which is referred to herein as a polarizer structure) may be first attached to a carrier. In some embodiments, the material of the carrier may be a carrier material such as glass or plastic, which can be used as a substrate for measuring the slip amount. In some embodiments, the optical film structure without the surface protection film has a size of about 15cm in length and about 5cm in width, and the carrier plate has a size of about 15cm in length and about 5cm in width, for example. Next, a surface protective film (e.g., having a size of about 15cm in length and about 2.5cm in width) is attached to the substrate using a roller of an appropriate weight (e.g., about 2 kg). In some embodiments, the surface protection film may be attached to the surface of the substrate by an adhesive layer. In some other embodiments, the surface protective film is attached to the substrate by an adhesive layer to form an optical film structure, and then the optical film structure with the surface protective film is integrally attached to the surface of the substrate. In some embodiments, the surface protection film may include an adhesive layer, and the surface protection film is attached to the surface of the substrate by the adhesive layer.
In some embodiments, the surface protection film has an area less than or equal to the surface of the substrate and/or the optical film (or the polarizing film structure). In some embodiments, polyethylene terephthalate (PET) may be used as a material of the surface protective film. After the bonding, the sample can be placed in an environment with a temperature of 25 ℃ and a humidity of 55% for 1 day, so that the bonding between the surface protection film, the optical film (or the polarizing film structure) and the substrate is firmer to form the sample for measuring the slippage. It should be understood that other sizes of surface protective films, optical films (or polarizing film structures), and substrates may be used for measurements in the sample pre-treatment described above.
The material of the surface protective film of the present disclosure is not particularly limited. In some embodiments, the material of the surface protective film may be a thermoplastic resin having good characteristics of transparency, mechanical strength, thermal stability, moisture barrier property, and the like. In some embodiments, the thermoplastic resin may include a cellulose resin (e.g., triacetate cellulose (TAC), diacetate cellulose (DAC)), an acrylic resin (e.g., poly (methyl methacrylate)), PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, an oriented-polypropylene (OPP), a Polyethylene (PE), a polypropylene (PP), a cycloolefin polymer (cyclo-olefin polymer, COP), a cyclo-olefin copolymer (COC), a Polycarbonate (PC), or any combination thereof Thermosetting resins such as epoxy resins and silicone resins, and ultraviolet curing resins. Further, the surface protective film may be subjected to a surface treatment such as an anti-glare treatment, an anti-reflection treatment, a hard coat treatment, a charge prevention treatment, or an anti-stain treatment.
In some embodiments, the thickness of the surface protection film may be 5 to 90 micrometers, preferably 35 to 80 micrometers.
In some embodiments, the optical film structure is, for example, a polarizer. In some embodiments, the polarizer may include a plurality of layers, for example, from top to bottom: a surface protection film, an adhesive layer, a first protection layer, a polarizer, a second protection layer, an adhesive layer, a release film (release film), etc., but the structure of the disclosure is not limited thereto, for example, the first and/or second protection layers may be omitted, or other optical film layers may be added. Herein, the structure formed by the first protective layer, the polarizer and the second protective layer is also referred to as a polarizing film structure.
In some embodiments, the material of the polarizer may be Polyvinyl alcohol (PVA) based resin, and the PVA based resin may be prepared by saponifying Polyvinyl acetate resin. The saponification degree of the polyvinyl alcohol resin is usually about 85 mol% or more. Examples of the polyvinyl acetate resin include a homopolymer of vinyl acetate (i.e., polyvinyl acetate), and a copolymer 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., ethyl vinyl 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 another monomer copolymerizable therewith include ethylene-vinyl acetate copolymers. 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 formal, polyvinyl acetal, polyvinyl butyral, etc. modified with aldehydes may be used.
In some embodiments, the polarizer has a thickness of 5 to 35 microns, preferably 20 to 30 microns.
In some embodiments, the material of the first protective layer and the second protective layer may be, for example, a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier property, and the like. The thermoplastic resin may include acetyl cellulose resin (e.g., TAC, DAC), acrylic resin (e.g., poly (methyl methacrylate), PMMA), polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cycloolefin resin, oriented-stretched polypropylene (OPP), Polyethylene (PE), polypropylene (PP), Cyclic Olefin Polymer (COP), Cyclic Olefin Copolymer (COC), Polycarbonate (PC), or any combination thereof Urethane series (e.g., Polyurethane (PU)), acrylic urethane series (e.g., polyacrylic urethane), epoxy series (e.g., epoxy resin), silicone series (e.g., silicone resin), and the like. In addition, the first protective layer and the second protective layer may be further subjected to a surface treatment, such as an anti-glare treatment, an anti-reflection treatment, a hard coat treatment, a charge prevention treatment, or an anti-stain treatment. In addition, in some embodiments, the first protective layer and the second protective layer are a single-layer or multilayer optical film.
In some embodiments, the first passivation layer and the second passivation layer may have a thickness of 5 to 90 micrometers, preferably 35 to 80 micrometers, respectively.
In some embodiments, the adhesive layer comprises a Pressure Sensitive Adhesive (PSA), a heat sensitive adhesive, a solvent volatile adhesive, and/or a UV curable adhesive. In some embodiments, the pressure sensitive adhesive may comprise natural rubber, synthetic rubber, styrenic 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 polarizer may further include an adhesive layer (not shown) between the first protective film and the polarizing material (or polarizer) and between the second protective film and the polarizing material (or polarizer). The adhesive layer may contain an aqueous adhesive, and is generally, for example, a composition prepared by using a polyvinyl alcohol resin or a urethane resin as a main component of the aqueous adhesive and adding a crosslinking agent or a curing compound such as an isocyanate compound or an epoxy compound to improve the adhesiveness.
In some embodiments, when the main component of the aqueous adhesive is a polyvinyl alcohol resin, in addition to partially saponified polyvinyl alcohol and completely saponified polyvinyl alcohol, modified polyvinyl alcohol resins such as carboxyl-modified polyvinyl alcohol, acetyl-modified polyvinyl alcohol, hydroxymethyl-modified polyvinyl alcohol, and amino-modified polyvinyl alcohol may be used. The aqueous solution of the polyvinyl alcohol resin can 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, per 100 parts by mass of water.
In some embodiments, in order to improve the adhesion as described above, a curable compound such as a polyvalent aldehyde, a water-soluble epoxy resin, a melamine compound, a zirconia compound, and a zinc compound may be added to the aqueous adhesive comprising an aqueous solution of a polyvinyl alcohol resin.
In some embodiments, the adhesive layer may be a uv curable adhesive, and the materials may be exemplified by: 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, ethylene adhesives such as ethylene-styrene copolymers, and acrylic adhesives such as ethylene-methyl (meth) acrylate copolymers and ethylene-ethyl (meth) acrylate copolymers.
Next, referring to fig. 1, in step S12, a slip amount measuring step may be performed. In some embodiments, a tensile tester (e.g., Shimadzu tensile AGX tester) may be used to perform the tensile step on the sample comprising the surface protective film. The surface protective film may be first fixed on a tensile tester and the position of the surface protective film may be recorded, then stretched at a fixed tension for a predetermined time, and the amount of slippage of the surface protective film with respect to the surface of the substrate and/or the optical film (or the polarizing film structure) may be measured. In some embodiments, the stretching may be at a constant tension of 10-60N, or at a constant tension of 20-50N, or at a constant tension of about 30N. In some embodiments, the stretching may be at a fixed tension for 0.5 to 3 hours, or 0.8 to 2 hours, or about 1 hour. In some embodiments, the slippage of the surface protective film relative to the surfaces of the substrate and the optical film (or the polarizing film structure) is the same, that is, only the surface protective film slips relative to the surfaces of the substrate and the optical film (or the polarizing film structure), and the optical film (or the polarizing film structure) does not slip relative to the substrate (the slippage approaches zero).
Next, referring to fig. 1, in step S13, the surface protection film may be evaluated for its warpage characteristics over time using the slip amount of the surface protection film with respect to the substrate as an index. In some embodiments, the aged warp characteristics of the surface protection film include an aged warp degree (or an aged warp value) of the surface protection film, an aged warp reduction value of the surface protection film, an aged warp reduction rate of the surface protection film, or any combination thereof.
In some embodiments, the degree of temporal warping (or the value of temporal warping) of the surface protective film decreases as the amount of slip of the surface protective film relative to the substrate increases. In some embodiments, the value of the warp decrease with time of the surface protective film increases as the amount of slip of the surface protective film relative to the substrate increases. In some embodiments, the rate of decrease in warpage of the surface protective film with time increases as the amount of slip of the surface protective film relative to the substrate increases.
The following test of the slippage was performed on various samples of the surface protective film for an optical film structure (or a polarizing plate) in which the surface protective film was attached to the optical film (or a polarizing film structure) through an adhesive layer, stretched for about 1 hour using a fixed tension of about 30N, and the slippage of the surface protective film with respect to the surface of the substrate was measured. Then, the optical film structure (or polarizing plate) including the above-described various surface protective films was subjected to the evaluation of the warpage with time, and the slip amount and the result of the evaluation of the warpage with time are shown in table 1 below. Thereby, the warp characteristics of the surface protective film with time can be evaluated using the slip amount of the surface protective film with respect to the surface of the substrate as an index.
For the evaluation of the warpage with time, the optical film structure (or the polarizing plate) including the above various surface protective films was cut into 13.3 inches (295.75mm × 168.24mm) sheets, 30 sheets of the optical film structure (or the polarizing plate) were stacked and placed in an aluminum foil bag, and the aluminum foil bag was sealed and sealed by vacuum pumping, and then the aluminum foil bag was stored at 25 ℃ and 55% humidity. And then, opening different aluminum foil bags at different time points, and taking 3 optical film structures (or polarizing plates) from the aluminum foil bags respectively to measure the warping degree (or warping value). In table 1, "initial tilt value" is a value measured after being stored for 1 day, "2-week-old tilt value" is a value measured after being stored for 2 weeks, "4-week-old tilt value" is a value measured after being stored for 4 weeks, and "6-week-old tilt value" is a value measured after being stored for 6 weeks. The warpage measurement method is to place the optical film structure (or polarizer) on a horizontal table, and measure the height of the surface protection film with 4 upward corners (which is positive warpage), i.e. the distance between the tilted corners of the surface protection film and the upper surface of the optical film (or polarizer film structure) below the surface protection film. The warp reduction rate (%) with time was calculated in the following manner: (initial warp value-warp value with time)/initial warp value.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Sliding quantity of surface protective film (mm) | 0 | 5 | 18 | 30 |
| Initial warpage value (mm) | 25 | 23 | 25 | 20 |
| Warp value (mm) of 2 weeks with time | 23 | 18 | 16 | 9 |
| Over time4 cycle warpage value (mm) | 20 | 13 | 10 | 1 |
| Warp value (mm) of 6 weeks with time | 21 | 12 | 9 | 2 |
| Warp reduction value (mm) over 2 |
2 | 5 | 9 | 11 |
| 4-week warpage degradation value (mm) | 5 | 10 | 15 | 19 |
| Warp reduction value (mm) over 6 weeks | 4 | 11 | 16 | 18 |
| Rate of decrease in warpage after 2 cycles | 8％ | 22％ | 36％ | 55％ |
| Warping for 4 weeksRate of |
20％ | 43％ | 60％ | 95％ |
| Rate of decrease in warpage after 6 weeks | 16％ | 48％ | 64％ | 90％ |
As can be seen from table 1, in the case where the initial warpage of each sample is not greatly different (about 20mm to 25mm), the larger the measured slip amount of the surface protection film after a certain period of time, the smaller the warpage with time, that is, the more slight the positive warpage. Further, after a lapse of a certain standing time, the value of the decrease in warp with time and the rate of decrease in warp with time increase as the measured slip amount of the surface protective film increases. However, the reduction of the warp value with time gradually saturates after being left for 4 weeks, and a negative warp structure is not formed. Therefore, as can be seen from the results of table 1, according to some embodiments of the present disclosure, the warp characteristics of the surface protective film with time can be determined from the measured amount of surface protective film slip. In some embodiments, when the slip of the surface protection film is about 0, the reduction rate of the surface protection film of the optical film structure in warpage over time may be equal to or less than 20%, and thus, the deformation of the optical film structure over time is smaller, so that the predictability of the deformation of the structure over time is higher, and the subsequent processing yield is also better improved.
In addition, the formulations of the adhesive layers of the respective examples are shown in table 2 below, in which "2-EHA" is 2-ethylhexyl acrylate, "BA" is butyl acrylate, "MMA" is methyl methacrylate, "HEMA" is hydroxyethyl methacrylate, and "2-HEA" is hydroxyethyl acrylate"4-HBA" is 4-hydroxybutylacrylate and "CORONATE L" is a hardener and has the following formula:
"CORONATE HX" is a hardener and has the following formula:
the proportions shown in table 2 are weight proportions.
TABLE 2
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Sliding quantity of surface protective film (mm) | 0 | 5 | 18 | 30 |
| 2-EHA | 75 | 50 | 60 | 95 |
| |
0 | 30 | 20 | 0 |
| |
0 | 0 | 7 | 0 |
| |
0 | 15 | 0 | 3 |
| 2- |
20 | 0 | 0 | 0 |
| 4- |
0 | 0 | 10 | 0 |
| |
0 | 5 | 3 | 0 |
| |
5 | 0 | 0 | 2 |
As can be seen from the results of table 2, the difference in composition of the adhesive layer affects the bonding strength between the surface protective film and the substrate, or between the surface protective film and the optical film (or polarizing film structure), thereby causing the surface protective film to have different slippage amounts with respect to the substrate. In some embodiments, the slip amount of the surface protection film decreases as the content of the hydroxyl-containing acrylate included in the adhesive layer increases and/or the content of the hardener included in the adhesive layer increases. In some embodiments, the higher the content of the hydroxyl group-containing acrylate contained in the adhesive layer, the smaller the slippage of the surface protective film. In some embodiments, the higher the amount of the hardener contained in the adhesive layer, the smaller the slippage of the surface protective film. In other words, according to some embodiments of the present disclosure, the slip amount of the surface protection film can be further adjusted by adjusting the composition of the adhesive layer, so as to obtain the predetermined warping characteristic of the surface protection film over time.
Fig. 2 is a graph of actual measurements of the relationship of the amount of slip of the surface protection film relative to the substrate versus the surface protection film warp characteristics over time, according to some embodiments of the present disclosure.
As shown in fig. 2, a curve S1 shows the relationship between the surface protection film slip amount and the warp reduction rate of the surface protection film with time of 2 cycles, and a curve S2 shows the relationship between the surface protection film slip amount and the warp reduction rate of the surface protection film with time of 4 cycles, and a curve S3 shows the relationship between the surface protection film slip amount and the warp reduction rate of the surface protection film with time of 6 cycles. In some embodiments, the state of decrease in the surface protective film warping with time gradually saturates after 4 weeks, and thus it can be seen that the curve S2 has substantially the same tendency as the curve S3. In other words, in some embodiments, the curve S2 may also be applied to determine the warpage characteristics of the surface protection film over 4 weeks (e.g., over 6 weeks).
In some embodiments, the relationship between the rate of decrease in warpage with time of the surface protective film over 2 weeks and the amount of slip can be represented by formula I:
Y1＝0.0132X2+0.0895X-0.0205 formula I
Wherein X is the slippage of the surface protective film, and Y1 is the warp reduction rate of the surface protective film over 2 weeks.
In some embodiments, the relationship between the warpage reduction rate over 4 weeks and the slip amount of the surface protective film can be represented by formula II:
Y2＝0.0288X2+0.0975X +0.0864 formula II
Wherein X is the slippage of the surface protective film, and Y2 is the rate of decrease in warpage of the surface protective film over 4 weeks.
As described above, the present disclosure provides a method for evaluating a surface protective film, which includes performing a slip amount measuring step of evaluating an aged warpage characteristic of the surface protective film using a slip amount of the surface protective film with respect to a substrate as an index. Furthermore, according to some embodiments of the present disclosure, a predetermined surface protection film warp characteristic with time may be achieved by adjusting the slip amount of the surface protection film relative to the substrate, for example, a predetermined warp value with time, a predetermined warp decrease value with time, and/or a predetermined warp decrease rate with time may be adjusted. In some embodiments, the predetermined warp property of the surface protective film over time can be achieved by adjusting the bonding strength between the surface protective film and the substrate, or the bonding strength between the surface protective film and the optical film (or the polarizing film structure).
In some embodiments, the surface protective film may be attached to the optical film (or the polarizing film structure) by attaching an adhesive layer having a predetermined formulation to form the surface protective film having a predetermined initial warpage value. In some embodiments, the surface protective film may include an adhesive layer having a predetermined formulation, and the surface protective film is attached to the optical film (or the polarizing film structure) by the adhesive layer thereof to form the surface protective film having a predetermined initial warpage value. In some embodiments, the relationship between the slip amount of the surface protection film relative to the substrate and the temporal warping characteristic of the surface protection film can be used as an index, and the adhesive layer with a corresponding predetermined formula is selected according to a predetermined temporal warping value to attach the surface protection film to the optical film (or the polarizing film structure) so as to form the surface protection film with a predetermined initial warping value, which further corresponds to the predetermined temporal warping value, so that the surface protection film can have the predetermined temporal warping value after a predetermined standing time. For example, when the predetermined elapsed warpage value of the surface protection film is 15mm and the predetermined standing time is 4 weeks, and it is known that an adhesive layer of a specific formula can make the surface protection film have a specific slip amount relative to the substrate, and it can be estimated from the slip amount that the attached surface protection film will have an initial warpage value of 25mm and a 4-week elapsed warpage value of 10, the surface protection film can be attached to an optical film (or a polarizing film structure) by using the adhesive layer of the specific formula to obtain a surface protection film with an initial warpage value of 25mm, and after 4 weeks elapsed, a surface protection film with a 4-week elapsed warpage value of 15mm is obtained.
In some embodiments, evaluating the time-dependent warpage characteristics of the surface protection film further comprises determining an initial warpage value of the surface protection film according to a slip amount of the surface protection film relative to the substrate and a lookup table (lookup table). In some embodiments, the lookup table contains a relationship between a slip amount of the surface protective film with respect to the substrate and an aged warping characteristic of the surface protective film. In some embodiments, the lookup table contains a relationship between a slip amount of the surface protective film with respect to the substrate and an extent of temporal warpage of the surface protective film, a relationship between a slip amount of the surface protective film with respect to the substrate and a temporal warpage degradation value of the surface protective film, a relationship between a slip amount of the surface protective film with respect to the substrate and a temporal warpage degradation rate of the surface protective film, or any combination thereof.
In some embodiments, the slip amount measurement step may be performed on a plurality of different surface protection films in advance to obtain different slip amounts of the surface protection films relative to the substrate, and the temporal warpage evaluation may be performed on the surface protection films with different slip amounts, and the data of the slip amounts and the temporal warpage evaluation may be collated and summarized in a lookup table to obtain a relationship between the slip amount of the surface protection film relative to the substrate and the temporal warpage characteristics of the surface protection film. In some embodiments, the adhesion strength between the surface protection film and the substrate, or between the surface protection film and the optical film (or the polarizing film structure) can be adjusted to design surface protection films with different slippage. In some embodiments, the surface protective film with different slippage can be designed by changing the adhesion layer between the surface protective film and the substrate or the adhesion layer between the surface protective film and the optical film (or the polarizing film structure).
Conventionally, each batch of optical film structure (or polarizing plate) products needs to be subjected to a time-lapse warping evaluation to confirm that the optical film structure (or polarizing plate) products have predetermined time-lapse warping characteristics, but the time-lapse warping evaluation takes a long time, so that one way to improve the time-lapse warping is to change the temperature and/or humidity conditions during the placement, in other words, to simulate the effect of a long time in a short time by more extreme environmental conditions. However, the time warp results caused by the simulated environment of changing temperature and/or humidity conditions are quite different from the time warp results actually placed, and thus reliable time warp evaluation results still cannot be provided. According to some embodiments of the present disclosure, the temporal warpage characteristic of the surface protection film can be evaluated by using the slippage of the surface protection film relative to the substrate as an index, and such an index not only has high accuracy but also does not require a long wait, and can effectively shorten the temporal warpage evaluation time.
Furthermore, when the optical film structure (or the polarizing plate) having the surface protection film is attached to the display panel one by one, if the warpage value of the surface protection film with time is too high, the optical film structure (or the polarizing plate) may not be easily vacuum-sucked, and the problem of poor attaching effect or bubbles generated at the attaching interface may be caused, thereby increasing the difficulty of workability and reducing the yield of the attaching process. In addition, if the warp value of the surface protection film over time is too low, adhesion between stacked optical film structures (or polarizing plates) may occur, and vacuum suction may also be difficult, thereby reducing the yield of the bonding process. According to some embodiments of the present disclosure, the relationship between the slip amount of the surface protection film relative to the substrate and the temporal warpage characteristic of the surface protection film can be used as an index to form the surface protection film with a predetermined temporal warpage value, so that the surface protection film with the predetermined temporal warpage value can be manufactured according to subsequent processing requirements, thereby increasing the processing convenience and yield. In some embodiments, the display panel 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 may be an OLED panel.
Fig. 3A, 3B, 3C, and 3D are flow diagrams of methods of manufacturing optical film structures 10 according to some embodiments of the present disclosure.
As shown in fig. 3A, an optical film 110A may be provided. In some embodiments, the optical film 110A is, for example, a polarizing film structure. In some embodiments, the optical film 110A includes a protective layer 111A (or referred to as a "first protective layer"), a polarizing film 113A (or referred to as a "polarizer"), and a protective layer 115A (or referred to as a "second protective layer").
In some embodiments, the materials of the protective layers 111A and 115A may be thermoplastic resins having good transparency, mechanical strength, thermal stability, moisture barrier property, and the like, respectively. In some embodiments, the thermoplastic resin may include a cellulose resin (e.g., Triacetylcellulose (TAC), Diacetylcellulose (DAC)), an acrylic resin (e.g., Polymethylmethacrylate (PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, oriented polypropylene (OPP), Polyethylene (PE), polypropylene (PP), a cycloolefin polymer (COP), a cycloolefin copolymer (COC), Polycarbonate (PC), or any combination thereof, in addition to which the materials of the protective layers 111A and 115A may also be, for example, thermosetting resins such as (meth) acrylic, urethane, acrylic urethane, epoxy, silicone, or the like, or ultraviolet hardening type resins, the protective layers 111A and 115A may be further subjected to surface treatment such as anti-glare treatment, anti-reflection treatment, hard coat treatment, electrification preventing treatment, anti-stain treatment, or the like.
In some embodiments, the material of the polarizing film 113A may be a polyvinyl alcohol (PVA) resin film, which may be prepared by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a homopolymer of vinyl acetate, i.e., polyvinyl acetate, and a copolymer 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., ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (e.g., vinylsulfonic acid, sodium vinylsulfonate), and the like.
In some embodiments, a surface protection film 120A is provided. In some embodiments, the temporal warping characteristic of the surface protection film 120A may be evaluated using the slippage of the surface protection film 120A with respect to the substrate (or carrier) as an index, and the predetermined initial warping value of the surface protection film 120A with respect to the optical film 110A may be determined according to the temporal warping characteristic of the surface protection film 120A. In some embodiments, the slippage of the surface passivation film 120A relative to the substrate (or carrier) can be measured by attaching the surface passivation film to the substrate (or carrier) and stretching the surface passivation film 120A at a constant tension for a predetermined time. In some embodiments, the slippage of the surface protection film 120A relative to the substrate (or carrier) can be measured by the slippage measurement process described herein. In some embodiments, the relationship between the slip amount of the surface protection film 120A relative to the substrate (or carrier) and the warp characteristics over time can be obtained through the aforementioned lookup table.
In some embodiments, an adhesive layer 130A having a predetermined formulation may be formed on the surface protective film 120A. In some embodiments, the surface protective film may include an adhesive layer 130A having a predetermined formulation. In some embodiments, the adhesive layer 130A with a predetermined formulation can provide a predetermined initial warpage value and/or a predetermined time warpage value for the subsequent surface protection film.
As shown in fig. 3B, the surface protection film 120A may be attached to the optical film 110A to form the optical film structure 10A. In some embodiments, the surface protection film 120A is attached to the optical film 110A by an adhesive layer 130A having a predetermined formulation. In some embodiments, the optical film structure 10A may be further slit. In some embodiments, after the surface protection film 120A is attached to the optical film 110A, the surface protection film 120A and the optical film 110A may be further cut to a predetermined size.
As shown in FIG. 3C, the surface protection film 120A and the optical film 110A are cut to form a plurality of optical film structures 10. In some embodiments, each optical film structure 10 (or polarizer) includes an optical film 110, an adhesive layer 130, and a surface protective film 120. In some embodiments, the optical film 110 includes a protective layer 111, a polarizing film 113, and a protective layer 115. In some embodiments, the surface protection film 120 of the optical film structure 10 has a predetermined initial warp value D1. In some embodiments, the shape of each optical film structure 10 (or polarizer plate) may be rectangular, circular, oval, barrel-shaped, or other unspecified shape.
As shown in fig. 3D, the surface protection film 120 of the optical film structure 10 may have an elapsed warpage value D2 after a certain period of standing time. In some embodiments, the elapsed warp value D2 is less than the initial warp value D1. In some embodiments, the warp value D2 over time is approximately 15mm to 20 mm. Thus, the optical film structure 10 is formed.
Embodiments of the present disclosure further provide a method of manufacturing a display. In some embodiments, the optical film structure 10 (or polarizing plate) may be provided and the optical film structure 10 (or polarizing plate) is bonded to a display panel to form a display. In some embodiments, the optical film structure 10 (or the polarizer) may be formed by the manufacturing method described in the embodiments of the present disclosure. In some embodiments, the display panel 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 may be an OLED panel.
While the present disclosure has been described with reference to the foregoing embodiments, it is not intended to be limited thereto. Those skilled in the art to which the disclosure pertains will readily appreciate that numerous modifications and adaptations may be made without departing from the spirit and scope of the disclosure. Therefore, the protection scope of the present disclosure should be determined by the definitions of the appended claims. Moreover, each claim is intended to constitute a separate embodiment, and all combinations of claims and embodiments are intended to be included within the scope of this disclosure.
Description of the symbols
10,10A optical film structure
110,110A optical film
111,111A, 115A protective layer
113,113A polarizing film
120,120A surface protective film
130,130A adhesive layer
Curves S1, S2, S3
S11, S12, S13
Claims (17)
1. A method for evaluating a surface protective film, comprising:
attaching a surface protective film to a substrate;
performing a slip measurement step, which includes:
stretching the surface protection film at a fixed tension for a predetermined time; and
measuring a slippage of the surface protection film relative to the substrate; and
evaluating an elapsed warp (warp over time) characteristic of the surface protective film with the slip amount of the surface protective film with respect to the substrate as an index.
2. The method for evaluating a surface protective film according to claim 1, wherein the aged warpage characteristics of the surface protective film include an aged warpage degree of the surface protective film, an aged warpage reduction value of the surface protective film, an aged warpage reduction rate of the surface protective film, or any combination thereof.
3. The method of evaluating a surface protective film according to claim 2, wherein the degree of the aged warp of the surface protective film decreases as the amount of slip of the surface protective film relative to the substrate increases.
4. The method of evaluating a surface protective film according to claim 2, wherein the value of the temporal warpage degradation and/or the temporal warpage degradation rate of the surface protective film increases as the amount of slippage of the surface protective film relative to the substrate increases.
5. The method for evaluating a surface protective film according to claim 2, wherein the surface protective film comprises an adhesive layer, and the slippage of the surface protective film decreases as a content of a hydroxyl group-containing acrylate included in the adhesive layer increases and/or a content of a hardener included in the adhesive layer increases.
6. The method for evaluating a surface protective film according to claim 4, wherein the relationship between the warp decrease rate with time for 2 weeks of the surface protective film and the slip amount is represented by formula I:
Y1＝0.0132X2+0.0895X-0.0205 formula I
Wherein X is the slippage of the surface protective film, and Y1 is the rate of decrease in warp of the surface protective film over time by 2 weeks.
7. The method for evaluating a surface protective film according to claim 4, wherein a relationship between a 4-week warp reduction rate of the surface protective film with time and the slip amount is represented by formula II:
Y2＝0.0288X2+0.0975X +0.0864 formula II
Wherein X is the slippage of the surface protective film, and Y2 is the 4-week warp reduction rate of the surface protective film.
8. The method for evaluating a surface protective film according to claim 1, wherein the fixing tension is 10 to 60N; and/or wherein the stretching time is 0.5 to 3 hours.
9. The method of evaluating a surface protective film according to claim 1, wherein evaluating the aged warping characteristic of the surface protective film further comprises:
determining an initial warp value of the surface protective film based on the amount of slip of the surface protective film with respect to the substrate and a lookup table (lookup table) including a relationship between the amount of slip of the surface protective film with respect to the substrate and the temporal warp characteristic of the surface protective film.
10. The method of evaluating a surface protective film according to claim 9, wherein the lookup table includes a relationship between the slippage amount of the surface protective film with respect to the substrate and an extent of temporal warpage of the surface protective film, a relationship between the slippage amount of the surface protective film with respect to the substrate and a value of temporal warpage degradation of the surface protective film, a relationship between the slippage amount of the surface protective film with respect to the substrate and a rate of temporal warpage degradation of the surface protective film, or any combination thereof.
11. A method of manufacturing an optical film structure, comprising:
providing an optical film;
evaluating an aged warp characteristic of a surface protective film with respect to a substrate using a slippage of the surface protective film with respect to the substrate as an index, wherein the slippage of the surface protective film with respect to the substrate is measured after attaching the surface protective film to the substrate and stretching the surface protective film at a fixed tension for a predetermined time; and attaching the surface protection film to the optical film to form the optical film structure.
12. The method of manufacturing an optical film structure according to claim 11, wherein the temporal warpage characteristic of the surface protective film comprises a temporal warpage degree of the surface protective film, a temporal warpage drop value of the surface protective film, a temporal warpage drop rate of the surface protective film, or any combination thereof.
13. The method of manufacturing an optical film structure according to claim 11, further comprising:
determining a predetermined initial warp value of the surface protective film with respect to the optical film according to the elapsed warp characteristics of the surface protective film.
14. The method of manufacturing an optical film structure according to claim 13, further comprising:
and adhering the surface protection film to the optical film by using an adhesive layer with a preset formula to form the surface protection film with the preset initial warping value.
15. The method of claim 14, wherein the slippage of the surface protection film decreases as the content of the hydroxyl-containing acrylate included in the adhesive layer increases and/or the content of the hardener included in the adhesive layer increases.
16. The method of manufacturing an optical film structure according to claim 11, further comprising:
and after the surface protection film is attached to the optical film, cutting the surface protection film and the optical film to form a plurality of optical film structures, wherein the warpage value of each surface protection film of the plurality of optical film structures with time is 15 mm-20 mm.
17. A method of manufacturing a display, comprising:
providing an optical film structure manufactured by the method of any one of claims 11 to 16; and
and attaching the optical film structure to a display panel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW111102109A TWI795175B (en) | 2022-01-19 | 2022-01-19 | Method of evaluating surface protective film, method of manufacturing optical film structure, and method of manufacturing display device |
| TW111102109 | 2022-01-19 |
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| Publication Number | Publication Date |
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| CN114460672A true CN114460672A (en) | 2022-05-10 |
| CN114460672B CN114460672B (en) | 2024-07-09 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202547636U (en) * | 2012-01-18 | 2012-11-21 | 明基材料有限公司 | Warp measuring device of membrane |
| CN205808332U (en) * | 2016-06-30 | 2016-12-14 | 南京贝迪电子有限公司 | A kind of blooming piece angularity verifying attachment |
| CN112645605A (en) * | 2020-12-01 | 2021-04-13 | 中国建材国际工程集团有限公司 | Processing technology for reducing warping degree of float glass after chemical tempering and glass |
| KR20210127828A (en) * | 2020-04-13 | 2021-10-25 | 주식회사 한엘 | Protect film for mobile device and method for producing the same |
| CN113567283A (en) * | 2021-01-21 | 2021-10-29 | 住华科技股份有限公司 | Method for evaluating surface protective film |
-
2022
- 2022-01-19 TW TW111102109A patent/TWI795175B/en active
- 2022-02-25 CN CN202210177782.0A patent/CN114460672B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202547636U (en) * | 2012-01-18 | 2012-11-21 | 明基材料有限公司 | Warp measuring device of membrane |
| CN205808332U (en) * | 2016-06-30 | 2016-12-14 | 南京贝迪电子有限公司 | A kind of blooming piece angularity verifying attachment |
| KR20210127828A (en) * | 2020-04-13 | 2021-10-25 | 주식회사 한엘 | Protect film for mobile device and method for producing the same |
| CN112645605A (en) * | 2020-12-01 | 2021-04-13 | 中国建材国际工程集团有限公司 | Processing technology for reducing warping degree of float glass after chemical tempering and glass |
| CN113567283A (en) * | 2021-01-21 | 2021-10-29 | 住华科技股份有限公司 | Method for evaluating surface protective film |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114460672B (en) | 2024-07-09 |
| TWI795175B (en) | 2023-03-01 |
| TW202331197A (en) | 2023-08-01 |
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