TWI757061B - Method of evaluation for surface protective film - Google Patents
Method of evaluation for surface protective film Download PDFInfo
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- TWI757061B TWI757061B TW110102218A TW110102218A TWI757061B TW I757061 B TWI757061 B TW I757061B TW 110102218 A TW110102218 A TW 110102218A TW 110102218 A TW110102218 A TW 110102218A TW I757061 B TWI757061 B TW I757061B
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- stiffness
- surface protection
- protection film
- protective film
- surface protective
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Polarising Elements (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
本揭露是有關於一種表面保護膜的評估方法，特別是有關於一種表面保護膜的抗雲紋（anti-mura）評估方法。The present disclosure relates to an evaluation method of a surface protection film, especially an anti-mura evaluation method of a surface protection film.
偏光膜為廣泛應用於顯示器之光學元件，隨著顯示器的應用越來越廣，例如，手機、穿戴式裝置等，對偏光膜品質的要求也越來越高。偏光膜在製成後通常會搭配表面保護膜貼合至各種尺寸的顯示器後再撕除表面保護膜，因此業界無不致力於改善表面保護膜的品質。Polarizing film is an optical element widely used in displays. As the application of displays becomes wider and wider, for example, mobile phones, wearable devices, etc., the requirements for the quality of the polarizing film are getting higher and higher. After the polarizing film is made, it is usually attached to displays of various sizes with a surface protection film, and then the surface protection film is removed. Therefore, the industry is devoted to improving the quality of the surface protection film.
為了解決上述問題，本揭露提供一種表面保護膜的評估方法，包括：硬挺度衰減率量測步驟，包括：將表面保護膜捲曲成筒狀樣品後，固定於夾具上，其中筒狀樣品具有第一高度；下壓筒狀樣品至第二高度後停止，並且量測表面保護膜隨時間的硬挺度變化；以及由表面保護膜隨時間的硬挺度變化計算表面保護膜的硬挺度衰減率；以及以表面保護膜的硬挺度衰減率作為指標，評估表面保護膜的抗雲紋特性。In order to solve the above problems, the present disclosure provides an evaluation method for a surface protection film, including: a step of measuring the stiffness decay rate, including: after the surface protection film is rolled into a cylindrical sample, and then fixed on a fixture, wherein the cylindrical sample has a first a height; press down the cylindrical sample to a second height and stop, and measure the stiffness change of the surface protection film with time; and calculate the stiffness decay rate of the surface protection film from the stiffness change of the surface protection film with time; and Using the stiffness decay rate of the surface protection film as an index, the anti-moire properties of the surface protection film were evaluated.
以下的揭示內容提供許多不同的實施例或範例，以展示本發明實施例的不同部件。以下將揭示本說明書各部件及其排列方式之特定範例，用以簡化本揭露敘述。當然，這些特定範例並非用於限定本揭露。例如，若是本說明書以下的發明內容敘述了將形成第一部件於第二部件之上或上方，即表示其包括了所形成之第一及第二部件是直接接觸的實施例，亦包括了尚可將附加的部件形成於上述第一及第二部件之間，則第一及第二部件為未直接接觸的實施例。此外，本揭露說明中的各式範例可能使用重複的參照符號及/或用字。這些重複符號或用字的目的在於簡化與清晰，並非用以限定各式實施例及/或所述配置之間的關係。The following disclosure provides many different embodiments or examples to illustrate different components of embodiments of the invention. The following will disclose specific examples of the components and their arrangement of the present specification, so as to simplify the description of the present disclosure. Of course, these specific examples are not intended to limit the present disclosure. For example, if the following summary of the present specification describes that the first part is formed on or above the second part, it means that it includes the embodiment in which the first and second parts are formed in direct contact, and also includes further Additional components may be formed between the first and second components described above, the first and second components being embodiments that are not in direct contact. In addition, the various examples in this disclosure may use repeated reference symbols and/or wording. These repeated symbols or words are used for simplicity and clarity, and are not used to limit the relationships between the various embodiments and/or the configurations.
再者，為了方便描述圖式中一元件或部件與另一（些）元件或部件的關係，可使用空間相對用語，例如「在…之下」、「下方」、「下部」、「上方」、「上部」及諸如此類用語。除了圖式所繪示之方位外，空間相對用語亦涵蓋使用或操作中之裝置的不同方位。當裝置被轉向不同方位時（例如，旋轉90度或者其他方位），則其中所使用的空間相對形容詞亦將依轉向後的方位來解釋。Furthermore, for convenience in describing the relationship of one element or component to another element or component(s) in the drawings, spatially relative terms such as "below", "below", "lower", "above" may be used , "upper" and similar terms. In addition to the orientation shown in the drawings, spatially relative terms also encompass different orientations of the device in use or operation. When the device is turned in a different orientation (eg, rotated 90 degrees or otherwise), the spatially relative adjectives used therein will also be interpreted in accordance with the turned orientation.
在此，「約」、「大約」、「大抵」之用語通常表示在一給定值或範圍的20%之內，較佳是10%之內，且更佳是5%之內，或3%之內，或2%之內，或1%之內，或0.5%之內。應注意的是，說明書中所提供的數量為大約的數量，亦即在沒有特定說明「約」、「大約」、「大抵」的情況下，仍可隱含「約」、「大約」、「大抵」之含義。Here, the terms "about", "approximately" and "approximately" generally mean within 20%, preferably within 10%, and more preferably within 5% of a given value or range, or within 3% Within %, or within 2%, or within 1%, or within 0.5%. It should be noted that the quantities provided in the specification are approximate quantities, that is to say, “about”, “approximately” and “approximately” can still be implied without the specific description of “about”, “approximately” and “approximately”. probably” meaning.
基於偏光板（貼合表面保護膜後）的產品生產效率，相當重視翹曲程度，若產品發生負翹曲（即偏光板往遠離表面保護膜的那一側翹曲）問題，容易造成使用者無法順利將偏光板貼合至玻璃基板。為了避免偏光板產品的負翹曲問題，可在製造偏光板時將翹曲調整成正翹曲（即偏光板往表面保護膜的那一側翹曲），而翹曲調整通常是藉由對表面保護膜加大張力來達成。Based on the production efficiency of the polarizing plate (after the surface protective film is attached), great attention is paid to the degree of warpage. The polarizer cannot be attached to the glass substrate smoothly. In order to avoid the problem of negative warpage of polarizer products, the warpage can be adjusted to positive warpage (that is, the polarizer is warped to the side of the surface protective film) when manufacturing the polarizer, and the warpage adjustment is usually done by adjusting the surface The protective film increases the tension to achieve.
然而，張力加大會讓表面保護膜受到延伸而產生形變，經時後會發生形變恢復而產生表面保護膜硬挺度衰減的現象，使得所製造的面板會容易產生雲紋（mura），其中雲紋是指面板的亮度、色度不均勻，會妨礙顯示器的性能。此外，形變恢復的過程中也會造成表面保護膜滑動，且表面保護膜張力加大可能會造成表面保護膜變形且厚度不均，這些原因也會容易造成面板雲紋。However, the increased tension will cause the surface protective film to be stretched and deformed. After time, the deformation will recover and the stiffness of the surface protective film will be attenuated, so that the manufactured panel will be prone to mura. Refers to the uneven brightness and chromaticity of the panel, which will hinder the performance of the display. In addition, the surface protective film will slide during the deformation recovery process, and the increased tension of the surface protective film may cause the surface protective film to deform and have uneven thickness, which may also easily cause panel moiré.
本發明實施例提供一種用於偏光板之表面保護膜的評估方法，其中包括硬挺度衰減率量測步驟，並且利用表面保護膜的硬挺度衰減率作為指標以評估表面保護膜的抗雲紋特性，以下將進一步詳細說明硬挺度衰減率的量測方式的實施例。應當理解的是，本發明所揭露的硬挺度衰減率的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整硬挺度衰減率量測步驟中所使用的參數。An embodiment of the present invention provides an evaluation method for a surface protection film for a polarizing plate, which includes a step of measuring the stiffness attenuation rate, and uses the stiffness attenuation rate of the surface protection film as an index to evaluate the moire resistance of the surface protection film , an embodiment of the measurement method of stiffness decay rate will be described in further detail below. It should be understood that the method for measuring the stiffness attenuation rate disclosed in the present invention is not limited to the following parameters, and those with ordinary knowledge in the art can freely adjust the parameters used in the stiffness attenuation rate measurement step.
在本揭露的表面保護膜之硬挺度衰減率量測步驟之前可進行樣品前處理。在一些實施例的樣品前處理中，首先可將裁切後的表面保護膜（例如長度30cm，寬度20cm）藉由使用適當重量（例如2kg）的滾輪，貼合在同樣尺寸的軟性材料上，以形成貼合後的表面保護膜樣品。貼合完畢後，可將樣品放置於溫度25℃且濕度55%的環境下1天，使表面保護膜和軟性材料的貼合更加牢固，並且在表面保護膜的硬挺度衰減率量測步驟前，將貼合後的表面保護膜和軟性材料裁切成適當尺寸，例如長度170mm且寬度15mm的尺寸，成為硬挺度衰減率量測的樣品。應當理解的是，在上述樣品前處理中，也可以使用其他尺寸的表面保護膜和軟性材料。Sample pretreatment can be performed before the step of measuring the stiffness decay rate of the surface protection film of the present disclosure. In the sample pretreatment of some embodiments, the cut surface protective film (for example, 30cm in length and 20cm in width) can be attached to a soft material of the same size by using a roller with an appropriate weight (for example, 2kg). To form a sample of the surface protection film after bonding. After the lamination is completed, the sample can be placed in an environment with a temperature of 25°C and a humidity of 55% for 1 day to make the surface protective film and the soft material adhere more firmly, and before the measurement of the stiffness attenuation rate of the surface protective film. , cut the bonded surface protective film and soft material into appropriate sizes, such as a size of 170 mm in length and 15 mm in width, to become a sample for stiffness attenuation rate measurement. It should be understood that other sizes of surface protection films and soft materials can also be used in the above-described sample pretreatment.
上述表面保護膜的材料並未特別限定，表面保護膜的材料可為透明性、機械強度、熱穩定性、水分阻隔性等優良之熱可塑性樹脂，例如可包括纖維素系樹脂、丙烯酸系樹脂、非結晶性聚烯烴系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、或上述之任意組合。纖維素系樹脂是指纖維素中部分的羥基被乙酸酯化之樹脂，或是一部分被乙酸酯化、一部分被其他酸酯化之混合酯。纖維素系樹脂較佳為纖維素酯系樹脂，更佳為乙醯基纖維素系樹脂，例如三乙醯基纖維素、二乙醯基纖維素、纖維素乙酸酯丙酸酯、纖維素乙酸酯丁酸酯等。被充分酯化的纖維素稱三醋酸纖維素（triacetate cellulose，TAC）、丙烯酸樹脂膜、聚芳香羥樹脂膜、聚醚樹脂膜、環聚烯烴樹脂膜（例如聚冰片烯樹脂膜）。聚碳酸酯系樹脂為例如由碳酸與二醇或雙酚所形成的聚酯，例如聚對苯二甲酸乙二醇酯（polyethylene Terephthalate，PET）、聚丙稀（polypropylene，PP）、聚乙烯（polyethylene，PE）。非結晶性聚烯烴系樹脂為例如環狀烯烴單體（共）聚合物（cyclo olefin (co)polymers，COC/COP），由降冰片烯、環戊二烯、二環戊二烯、四環十二碳烯等開環聚合物，或與烯烴類之共聚合物所構成、聚碳酸酯（polycarbonate，PC）以及上述任意組合所組成的一族群。除此之外，保護層材料還可以是例如（甲基）丙烯酸系、胺基甲酸酯系、丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等熱硬化性樹脂或紫外線硬化型樹脂。此外，亦可進一步對上述表面保護膜的材料實行表面處理，例如，抗眩光處理、抗反射處理、硬塗處理、帶電防止處理或抗污處理等。The material of the above-mentioned surface protection film is not particularly limited, and the material of the surface protection film can be a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc., for example, it can include cellulose resin, acrylic resin, Amorphous polyolefin-based resin, polyester-based resin, polycarbonate-based resin, or any combination of the above. Cellulose resins refer to resins in which part of the hydroxyl groups in cellulose are esterified with acetic acid, or mixed esters in which part of the hydroxyl groups are esterified with acetic acid and part of them are esterified with others. The cellulose-based resin is preferably a cellulose ester-based resin, more preferably an acetyl cellulose-based resin, such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate, etc. Fully esterified cellulose is called triacetate cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, cyclic polyolefin resin film (such as polybornene resin film). The polycarbonate resin is, for example, a polyester formed of carbonic acid and diol or bisphenol, such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (polyethylene terephthalate) , PE). Non-crystalline polyolefin-based resins are, for example, cycloolefin (co)polymers (COC/COP) composed of norbornene, cyclopentadiene, dicyclopentadiene, tetracyclic Ring-opening polymers such as dodecene, or a group consisting of copolymers with olefins, polycarbonate (PC) and any combination of the above. In addition, the protective layer material may be, for example, thermosetting resins such as (meth)acrylic, urethane, urethane acrylate, epoxy, and polysiloxane, or ultraviolet curing resins. type resin. In addition, surface treatment such as anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-static treatment or anti-fouling treatment, etc. may be further performed on the material of the above-mentioned surface protective film.
上述軟性材料可為一單層或多層光學膜。軟性材料的材料亦並未特別限定，軟性材料的材料可以包括三醋酸纖維素（TAC）、二醋酸纖維素（DAC）、聚甲基丙烯酸甲酯（PMMA）、聚對苯二甲酸乙二酯（PET）、聚萘二甲酸乙二酯、烯烴樹脂、聚碳酸酯樹脂（PC）、環烯烴樹脂、定向拉伸性聚丙烯（OPP）、聚乙烯（PE）、聚丙烯（PP）、環烯烴聚合物（COP）、環烯烴共聚合物（COC）、胺基甲酸酯（PU）、丙烯酸胺基甲酸酯、環氧樹脂、聚矽氧樹脂、或上述之任意組合。The above-mentioned soft material can be a single-layer or multi-layer optical film. The material of the soft material is not particularly limited, and the material of the soft material may include triacetate cellulose (TAC), diacetate cellulose (DAC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate, olefin resin, polycarbonate resin (PC), cyclic olefin resin, oriented stretch polypropylene (OPP), polyethylene (PE), polypropylene (PP), cyclic Olefin Polymer (COP), Cyclic Olefin Copolymer (COC), Urethane (PU), Urethane Acrylate, Epoxy, Polysiloxane, or any combination of the above.
在一個特定的實施例中，表面保護膜的材料可包括聚甲基丙烯酸甲酯，而軟性材料的材料可包括三醋酸纖維素。In a specific embodiment, the material of the surface protection film may include polymethyl methacrylate, and the material of the soft material may include cellulose triacetate.
在一個特定的實施例中，表面保護膜的材料可包括聚甲基丙烯酸甲酯，而軟性材料可為一多層光學膜層，與表面保護膜貼合後成為一偏光板。在一些實施例中，偏光板的結構可以包括各種膜層，由上到下依序為例如：表面保護膜、黏著層、第一保護層（材料例如為三醋酸纖維素薄膜）、作為偏光材料的聚乙烯醇薄膜、第二保護層（材料例如為三醋酸纖維素薄膜）、黏著層、離型膜（release film）等，但在本揭露的結構並非限定於此，例如可省略第一及/或第二保護層，或使用其他常用材料。In a specific embodiment, the material of the surface protection film may include polymethyl methacrylate, and the soft material may be a multi-layer optical film layer, which is laminated with the surface protection film to form a polarizing plate. In some embodiments, the structure of the polarizing plate may include various film layers, in order from top to bottom, for example: a surface protection film, an adhesive layer, a first protection layer (such as a triacetate cellulose film), a polarizing material The polyvinyl alcohol film, the second protective layer (such as a cellulose triacetate film), an adhesive layer, a release film, etc., but the structure of the present disclosure is not limited to this, for example, the first and /or a second protective layer, or use other common materials.
在一些實施例中，黏著層包含壓敏性黏著劑（pressure sensitive adhesive, PSA）、熱敏性黏著劑、溶劑揮發性黏著劑、及UV可固化黏著劑。在一些實施例中，壓敏性黏著劑包含天然橡膠、合成橡膠、苯乙烯嵌段共聚物、（甲基）丙烯酸系嵌段共聚物、聚乙烯基醚、聚烯烴、及聚（甲基）丙烯酸酯。在一些實施例中，（甲基）丙烯酸（或丙烯酸酯）係指丙烯酸及甲基丙烯酸類二者。在另一些實施例中，壓敏性黏著劑包含（甲基）丙烯酸酯、橡膠、熱塑性彈性體、聚矽氧、胺基甲酸酯、及其組合。在一些實施例中，壓敏性黏著劑係基於（甲基）丙烯酸系壓敏性黏著劑或基於至少一種聚（甲基）丙烯酸酯。In some embodiments, the adhesive layer includes a pressure sensitive adhesive (PSA), a heat sensitive adhesive, a solvent volatile adhesive, and a UV curable adhesive. In some embodiments, the pressure-sensitive adhesive comprises natural rubber, synthetic rubber, styrene block copolymers, (meth)acrylic block copolymers, polyvinyl ethers, polyolefins, and poly(methyl) Acrylate. In some embodiments, (meth)acrylic (or acrylate) refers to both acrylic and methacrylic. In other embodiments, the pressure sensitive adhesive comprises (meth)acrylates, rubbers, thermoplastic elastomers, polysiloxanes, urethanes, and combinations thereof. In some embodiments, the pressure sensitive adhesive is based on a (meth)acrylic pressure sensitive adhesive or based on at least one poly(meth)acrylate.
接著參照第1圖，第1圖是根據一些實施例，繪示了表面保護膜的硬挺度衰減率量測步驟的示意圖。首先在步驟S1中，將貼合有軟性材料的表面保護膜樣品102捲成橫截面是例如橢圓形的筒狀，並且將樣品102固定在拉力機的夾具104的下部104-1上，其中筒狀樣品102具有第一高度h1，第一高度h1的範圍為例如50~90mm。在一些實施例中，在樣品102長度為170mm的情況下，第一高度h1可以是例如80mm。接著在步驟S2中，將夾具的上部104-2往下移動以碰觸筒狀樣品102，並使筒狀樣品102維持第一高度h1。Next, referring to FIG. 1 , FIG. 1 is a schematic diagram illustrating a step of measuring the stiffness decay rate of the surface protection film according to some embodiments. First, in step S1, the surface
接著在步驟S3中，採用例如130mm/min的下壓速度開始對筒狀樣品102施壓，且下壓至筒狀樣品102具有第二高度h2後停止，並且量測表面保護膜隨時間的硬挺度變化，其中第二高度的範圍為例如5~60mm。關於第二高度h2的選擇，如果第二高度太大，則樣品的變形量會較小，雖然樣品仍會發生硬挺度衰減，但各樣品的性能差異將太小而難以辨認；反之，如果第二高度太小，則樣品的變形量會較大，但有時會造成樣品破裂而導致數據難以判讀。在一些實施例中，在樣品102長度為170mm的情況下，第二高度h2可以是例如15mm。接著在步驟S4（未顯示）中，當觀察到表面保護膜的硬挺度發生下降一段時間後停止量測，並且利用表面保護膜隨時間的硬挺度變化計算表面保護膜的硬挺度衰減率。在一個實施例中，在步驟S4中當觀察到表面保護膜的硬挺度發生下降後的硬挺度變化的測量時間（硬挺度衰減時間）可以是例如1~5秒。Next, in step S3, the
第2圖是根據一實施例，繪示了表面保護膜硬挺度對時間的關係之實際量測的圖表。在這個實施例中，以130mm/min的下壓速度對筒狀樣品施壓，將筒狀樣品從80mm的第一高度下壓至具有15mm的第二高度後停止。如第2圖所示，表面保護膜在開始下壓之後約30秒達到對應第二高度的約350N/25mm的最大硬挺度M，接著停止向下施壓。參照第2圖的硬挺度衰減區A，表面保護膜在經歷最大硬挺度M後開始硬挺度衰減，從最大硬挺度M時的約350N/25mm衰減到5秒後的約250N/25mm，並且在表面保護膜的硬挺度隨著時間衰減時測量表面保護膜的硬挺度變化一段時間。在一些實施例中，如第2圖所示，上述測量時間是例如5秒。FIG. 2 is a graph illustrating the actual measurement of the relationship between the stiffness of the surface protection film and the time according to an embodiment. In this example, the cylindrical sample was pressed at a pressing speed of 130 mm/min and stopped after pressing the cylindrical sample from a first height of 80 mm to a second height of 15 mm. As shown in FIG. 2 , the surface protection film reached the maximum stiffness M of about 350 N/25 mm corresponding to the second height about 30 seconds after the start of pressing, and then stopped pressing down. Referring to the stiffness decay zone A in Figure 2, the surface protective film starts stiffness decay after experiencing the maximum stiffness M, from about 350N/25mm at the maximum stiffness M to about 250N/25mm after 5 seconds, and at The stiffness of the surface protection film is measured as the stiffness of the surface protection film changes over a period of time as it decays with time. In some embodiments, as shown in FIG. 2, the measurement time described above is, for example, 5 seconds.
表面保護膜的硬挺度衰減率由以下式（1）所計算： 式（1）：硬挺度衰減率=（最大硬挺度 − 反應後硬挺度）÷ 最大硬挺度 其中反應後硬挺度為最大硬挺度產生後經過n秒時所截取的硬挺度，n可以是例如1~5。舉例而言，在第2圖的實施例中，以最大硬挺度M（約350mN/25mm）產生後經過5秒時所截取的硬挺度（約250mN/25mm）所計算出的硬挺度衰減率為（350－250）÷ 350=0.286 × 100%=28.6%。 The stiffness decay rate of the surface protective film is calculated by the following formula (1): Formula (1): Stiffness Attenuation Rate = (Maximum Stiffness − Reaction Stiffness) ÷ Maximum Stiffness The stiffness after the reaction is the stiffness taken at n seconds after the generation of the maximum stiffness, and n can be, for example, 1-5. For example, in the embodiment of Fig. 2, the stiffness decay rate calculated from the stiffness (about 250mN/25mm) taken 5 seconds after the generation of the maximum stiffness M (about 350mN/25mm) (350－250) ÷ 350=0.286 × 100%=28.6%.
作為表面保護膜的抗雲紋性能，評估表面保護膜所製成的面板是否有雲紋產生，可透過評估雲紋步驟，包含：首先可將表面保護膜貼合至偏光膜上，所述偏光膜，係用以將通過的光（具有任一方向之極化光）轉換成特定方向之偏極光之膜。偏光膜可採用已知的金屬偏光膜、碘系偏光膜、染料系偏光膜、聚乙烯偏光膜等。偏光膜的材料可為聚乙烯醇（PVA）樹脂膜，聚乙烯醇膜可藉由皂化聚醋酸乙烯樹脂製得。聚醋酸乙烯樹脂的例子包括醋酸乙烯之單聚合物，即聚醋酸乙烯，以及醋酸乙烯之共聚合物和其他能與醋酸乙烯進行共聚合之單體。其他能與醋酸乙烯進行共聚合之單體的例子包括不飽和羧酸（例如丙烯酸、甲基丙烯酸、丙烯酸乙酯、正丙烯酸丙酯、甲基丙烯酸甲酯）、烯烴（例如乙烯、丙烯、1-丁烯、2-甲丙烯）、乙烯醚（例如乙基乙烯醚、甲基乙烯醚、正丙基乙烯醚、異丙基乙烯醚）、不飽和磺酸（例如乙烯基磺酸、乙烯基磺酸鈉）等。As the anti-moire performance of the surface protection film, to evaluate whether the panel made of the surface protection film has moiré, the evaluation steps of moiré can include: firstly, the surface protection film can be attached to the polarizing film, the polarized light The film is used to convert the passing light (polarized light in any direction) into polarized light in a specific direction. As the polarizing film, known metal polarizing films, iodine-based polarizing films, dye-based polarizing films, polyethylene polarizing films, and the like can be used. The material of the polarizing film can be polyvinyl alcohol (PVA) resin film, and the polyvinyl alcohol film can be prepared by saponifying polyvinyl acetate resin. Examples of polyvinyl acetate resins include a monopolymer of vinyl acetate, ie, polyvinyl acetate, as well as copolymers of vinyl acetate and other monomers that can be copolymerized with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids (eg acrylic acid, methacrylic acid, ethyl acrylate, propyl n-acrylate, methyl methacrylate), olefins (eg 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. vinyl sulfonic acid, vinyl Sodium sulfonate) etc.
上述偏光膜材料例如使用聚乙烯醇（polyvinyl alcohol，PVA）薄膜等其他光學膜層所構成的積體層以製備偏光板，接著參照第3A圖，將偏光板302貼合至顯示面板304（以下合稱為面板），其中顯示面板304的後方附有作為發光源的背光模組306。在一些實施例中，偏光板的結構可以包括各種膜層，由上到下依序為例如：表面保護膜、黏著層、第一保護層（材料例如為三醋酸纖維素薄膜）、作為偏光材料的聚乙烯醇薄膜、第二保護層（材料例如為三醋酸纖維素薄膜）、黏著層、離型膜（release film）等，但在本揭露中用於評估面板是否有雲紋產生的偏光板的結構與材料並非限定於此，例如可省略第一及/或第二保護層，或使用其他常用材料。The above-mentioned polarizing film material, for example, uses an integrated layer composed of other optical film layers such as polyvinyl alcohol (PVA) film to prepare a polarizing plate. It is called a panel), wherein a
在將偏光板302貼合至顯示面板304後，以發光模組306發射一光源以進行點燈檢查，利用配置於偏光板302與顯示面板304的前方距離D處（例如約1m處）的相機308擷取光源穿透偏光板302的影像，並確認影像中色度（或亮度）不均勻的位置及色度均勻的位置，此步驟可經由人員目視確認，再進一步比對色度均勻的位置與不均勻的位置之RGB色碼。After the
關於RGB色碼的比對方式，首先參照第3B圖。第3B圖是根據一些實施例，對面板進行點燈檢查的結果的影像，其中可以確認到亮度不均勻的光從偏光板穿透，藉此找出亮度不均處以及亮度均勻處之RGB色碼，並且將RGB色碼具有最大值和最小值處分別定義為亮度不均位置P1（RGB色碼為R1、G1、B1）和亮度均勻位置P2（RGB色碼為R2、G2、B2），上述RGB色碼的數值為：√((R) 2+(G) 2+(B) 2)，其中R、G、B分別為亮度測量處之RGB色碼。接著，藉由以下式（2）來計算面板的亮度不均勻度： 式（2）：亮度不均勻度=√((R1－R2) 2+(G1－G2) 2+(B1－B2) 2) For the comparison method of the RGB color code, first refer to Figure 3B. FIG. 3B is an image of the result of lighting inspection of the panel according to some embodiments, in which it can be confirmed that light with uneven brightness penetrates through the polarizer, thereby finding the RGB color at the uneven brightness and the uniform brightness and define the position where the RGB color code has the maximum value and the minimum value as the uneven brightness position P1 (RGB color code is R1, G1, B1) and the brightness uniform position P2 (RGB color code is R2, G2, B2), respectively, The value of the above RGB color code is: √((R) 2 +(G) 2 +(B) 2 ), where R, G, and B are the RGB color codes at the luminance measurement location, respectively. Next, calculate the brightness unevenness of the panel by the following formula (2): formula (2): brightness unevenness=√((R1-R2) 2 +(G1-G2) 2 +(B1-B2) 2 )
面板雲紋的評估是基於以下基準：嚴重（X）、輕微（Δ）、及正常（O）。上述基準是藉由面板的亮度不均勻度來定義，例如，可以在面板的亮度不均勻度為110以上時，定義面板雲紋的評估結果為嚴重（X），即容易產生雲紋；在面板的亮度不均勻度為50~110時，定義面板雲紋的評估結果為輕微（Δ），即在可接受範圍產生些微雲紋；在面板的亮度不均勻度為50以下時，定義面板雲紋的評估結果為正常（O），即不產生雲紋。Panel moiré was assessed based on the following benchmarks: Severe (X), Slight (Δ), and Normal (O). The above benchmarks are defined by the brightness unevenness of the panel. For example, when the brightness unevenness of the panel is above 110, the evaluation result of panel moiré can be defined as severe (X), that is, moiré is likely to be generated; When the brightness unevenness of the panel is 50~110, the evaluation result of the panel moiré is defined as slight (Δ), that is, a slight moiré is generated in the acceptable range; when the brightness unevenness of the panel is below 50, the panel moiré is defined as The evaluation result is normal (O), that is, no moiré is produced.
以下針對各種用於偏光板的表面保護膜材料的樣品進行硬挺度衰減率的測試，其中分別使用最大硬挺度產生後經過1秒、3秒、及5秒時所截取的硬挺度作為反應後硬挺度，用於計算硬挺度衰減率。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較硬挺度衰減率測試及點燈檢查的結果。其結果表示於以下表1。藉此，可以使用表面保護膜的硬挺度衰減率作為指標，評估表面保護膜的抗雲紋特性。The following is a test of stiffness decay rate for various samples of surface protective film materials for polarizing plates, wherein the stiffness intercepted at 1 second, 3 seconds, and 5 seconds after the generation of the maximum stiffness is used as the stiffness after reaction. degrees, used to calculate the stiffness decay rate. Then, the panel including the above-mentioned various surface protection film materials was used for lighting inspection to observe whether moiré was generated, and compare the results of the stiffness attenuation rate test and the lighting inspection. The results are shown in Table 1 below. Thereby, the stiffness decay rate of the surface protection film can be used as an index to evaluate the moire resistance of the surface protection film.
表1
由表1可以得知，硬挺度衰減率較低的表面保護膜樣品所製造出的面板具有較低的亮度不均勻度，較不容易產生雲紋。由表1中的測試結果可以確認到，在使用最大硬挺度產生後經過1秒、3秒、及5秒時所截取的硬挺度作為反應後硬挺度，用於計算硬挺度衰減率時，硬挺度衰減率分別為1.3%、2.7%、及4.4%以下的表面保護膜樣品所製造的面板具有50以下的亮度不均勻度，因此具有正常（O）的雲紋評估結果，無亮度不均勻的問題，即不產生雲紋；而硬挺度衰減率分別為1.4%、2.9%、及4.7%以上的表面保護膜樣品所製造的面板具有50以上的亮度不均勻度，因此具有嚴重（X）或輕微（Δ）的雲紋評估結果，可以確認到亮度不均勻的光從面板穿透，即硬挺度衰減率較高的表面保護膜樣品所製造出的面板較容易產生雲紋。依據雲紋評估結果，顯示表面保護膜樣品硬挺度衰減率小於4.7%較不易產生雲紋；更佳的表面保護膜樣品硬挺度衰減率小於4.4%不產生雲紋，具有較佳的抗雲紋特性。It can be seen from Table 1 that the panels produced by the surface protective film samples with lower stiffness decay rate have lower brightness unevenness and are less likely to generate moiré. From the test results in Table 1, it can be confirmed that the stiffness intercepted at 1 second, 3 seconds, and 5 seconds after the generation of the maximum stiffness is used as the stiffness after reaction, and when used to calculate the stiffness decay rate, the stiffness is Panels manufactured from surface protective film samples with luminance attenuation rates of 1.3%, 2.7%, and 4.4% or less have luminance unevenness below 50, and therefore have a normal (O) moiré evaluation result, without luminance unevenness. The problem is that no moiré is generated; and the panels produced by the surface protection film samples with stiffness decay rates of 1.4%, 2.9%, and 4.7% or more have brightness unevenness of more than 50, so they have severe (X) or A slight (Δ) moiré evaluation result confirms that light with uneven brightness penetrates through the panel, that is, the panel produced by the surface protection film sample with a higher stiffness attenuation rate is more prone to moiré. According to the evaluation results of moiré, it shows that the stiffness attenuation rate of the surface protective film sample is less than 4.7%, which is less likely to produce moiré; the better surface protective film sample has a stiffness attenuation rate of less than 4.4%, which does not produce moire, and has better anti-moire characteristic.
如上所述，本揭露提供一種表面保護膜的評估方法，其中包括硬挺度衰減率量測步驟以取得表面保護膜的硬挺度衰減率，並且將硬挺度衰減率作為指標，用於評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As described above, the present disclosure provides an evaluation method for a surface protection film, which includes a step of measuring the stiffness attenuation rate of the surface protection film to obtain the stiffness attenuation rate of the surface protection film, and uses the stiffness attenuation rate as an index for evaluating various surface protections Anti-moire properties of film samples. Thereby, this anti-moire evaluation method can be used to evaluate whether various surface protection film materials for polarizers are prone to generate uneven brightness moiré phenomenon after the optical display device is manufactured.
除了利用硬挺度衰減率作為表面保護膜的抗雲紋特性的指標外，由於表面保護膜受到延伸而產生形變後會發生形變恢復，造成表面保護膜滑動的現象並產生偏光板變形，使得所製造的面板會容易產生雲紋，造成顯示器亮度不均勻。為了降低偏光板的變形，需要採用低滑動性的表面保護膜。因此，在一些實施例中，可以在表面保護膜的評估方法中進一步加入滑移量量測步驟，並且利用表面保護膜相對於基板的滑移量作為指標，評估表面保護膜的抗雲紋特性。以下將進一步詳細說明滑移量的量測方式的實施例。應當理解的是，本發明所揭露的滑移量的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整滑移量量測步驟中所使用的參數。In addition to using the stiffness decay rate as an indicator of the anti-moire characteristics of the surface protective film, deformation recovery will occur after the surface protective film is stretched and deformed, causing the surface protective film to slip and the polarizer to deform, making the manufactured The panel will be prone to moiré, resulting in uneven display brightness. In order to reduce the deformation of the polarizing plate, it is necessary to use a surface protection film with low sliding properties. Therefore, in some embodiments, a slippage measurement step may be further added to the evaluation method of the surface protection film, and the slippage of the surface protection film relative to the substrate may be used as an index to evaluate the anti-moire properties of the surface protection film . Embodiments of the slippage measurement method will be described in further detail below. It should be understood that the slip measurement method disclosed in the present invention is not limited to the following parameters, and those with ordinary knowledge in the art can freely adjust the parameters used in the slip measurement step.
在本揭露的表面保護膜之滑移量量測步驟前可先進行樣品前處理。在一些實施例的樣品前處理中，首先可將不含表面保護膜的偏光板（例如長度15cm，寬度5cm）貼合在一載板上，其中載板的材料例如是玻璃或塑膠等承載材料，而作為用於滑移量量測的基板。接著，使用適當重量（例如2kg）的滾輪將表面保護膜（長度15cm，寬度2.5cm）藉由黏著層貼合在上述作為基板的表面。在一實施例中，亦可先將表面保護膜與偏光板藉由黏著層先行貼合後，再將之貼合在基板的表面上。黏著層的材料與本說明書前段揭露相同，在此不再贅述。A sample pretreatment can be performed before the step of measuring the slip of the surface protection film of the present disclosure. In the sample pretreatment in some embodiments, a polarizer without a surface protection film (eg, 15 cm in length, 5 cm in width) can be attached to a carrier plate, wherein the material of the carrier plate is, for example, a carrier material such as glass or plastic , as the substrate for slip measurement. Next, a surface protection film (
在一實施例中，表面保護膜的面積小於或等於基板及/或偏光板的表面。上述表面保護膜的材料並未特別限定，表面保護膜的材料可為透明性、機械強度、熱穩定性、水分阻隔性等優良之熱可塑性樹脂，例如可包括纖維素系樹脂、丙烯酸系樹脂、非結晶性聚烯烴系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、或上述之任意組合。纖維素系樹脂是指纖維素中部分的羥基被乙酸酯化之樹脂，或是一部分被乙酸酯化、一部分被其他酸酯化之混合酯。纖維素系樹脂較佳為纖維素酯系樹脂，更佳為乙醯基纖維素系樹脂，例如三乙醯基纖維素、二乙醯基纖維素、纖維素乙酸酯丙酸酯、纖維素乙酸酯丁酸酯等。被充分酯化的纖維素稱三醋酸纖維素（triacetate cellulose，TAC）、丙烯酸樹脂膜、聚芳香羥樹脂膜、聚醚樹脂膜、環聚烯烴樹脂膜（例如聚冰片烯樹脂膜）。聚碳酸酯系樹脂為例如由碳酸與二醇或雙酚所形成的聚酯，例如聚對苯二甲酸乙二醇酯（polyethylene Terephthalate，PET）、聚丙稀（polypropylene，PP）、聚乙烯（polyethylene，PE）。非結晶性聚烯烴系樹脂為例如環狀烯烴單體（共）聚合物（cyclo olefin (co)polymers，COC/COP），由降冰片烯、環戊二烯、二環戊二烯、四環十二碳烯等開環聚合物，或與烯烴類之共聚合物所構成、聚碳酸酯（polycarbonate，PC）以及上述任意組合所組成的一族群。除此之外，保護層材料還可以是例如（甲基）丙烯酸系、胺基甲酸酯系、丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等熱硬化性樹脂或紫外線硬化型樹脂。此外，亦可進一步對上述表面保護膜的材料實行表面處理，例如，抗眩光處理、抗反射處理、硬塗處理、帶電防止處理或抗污處理等。In one embodiment, the area of the surface protection film is smaller than or equal to the surface of the substrate and/or the polarizing plate. The material of the above-mentioned surface protection film is not particularly limited, and the material of the surface protection film can be a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc., for example, it can include cellulose resin, acrylic resin, Amorphous polyolefin-based resin, polyester-based resin, polycarbonate-based resin, or any combination of the above. Cellulose resins refer to resins in which part of the hydroxyl groups in cellulose are esterified with acetic acid, or mixed esters in which part of the hydroxyl groups are esterified with acetic acid and part of them are esterified with others. The cellulose-based resin is preferably a cellulose ester-based resin, more preferably an acetyl cellulose-based resin, such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate, etc. Fully esterified cellulose is called triacetate cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, cyclic polyolefin resin film (such as polybornene resin film). The polycarbonate resin is, for example, a polyester formed of carbonic acid and diol or bisphenol, such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (polyethylene terephthalate) , PE). Non-crystalline polyolefin-based resins are, for example, cycloolefin (co)polymers (COC/COP) composed of norbornene, cyclopentadiene, dicyclopentadiene, tetracyclic Ring-opening polymers such as dodecene, or a group consisting of copolymers with olefins, polycarbonate (PC) and any combination of the above. In addition, the protective layer material may be, for example, thermosetting resins such as (meth)acrylic, urethane, urethane acrylate, epoxy, and polysiloxane, or ultraviolet curing resins. type resin. In addition, surface treatment such as anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-static treatment or anti-fouling treatment, etc. may be further performed on the material of the above-mentioned surface protective film.
在一特定實施例中，可以使用聚對苯二甲酸乙二酯（PET）作為表面保護膜的材料。貼合完畢後，可將樣品放置於溫度25℃且濕度55%的環境下1天，使表面保護膜和偏光板及基板間的貼合更加牢固以成為滑移量量測的樣品。應當理解的是，在上述樣品前處理中，也可以使用其他尺寸的表面保護膜、偏光板、及玻璃進行量側。In a specific embodiment, polyethylene terephthalate (PET) may be used as the material of the surface protection film. After the lamination is completed, the sample can be placed in an environment with a temperature of 25°C and a humidity of 55% for 1 day to make the attachment between the surface protective film, the polarizer and the substrate firmer and become a sample for slip measurement. It should be understood that in the above-mentioned sample pretreatment, surface protection films, polarizers, and glass of other sizes can also be used for measurement.
關於表面保護膜的滑移量量測步驟，在一些實施例中，使用拉伸試驗機（例如，島津製拉力AGX試驗機）以對表面保護膜樣品進行拉伸。首先將表面保護膜固定在拉伸試驗機上並記錄表面保護膜的位置，接著以一固定張力拉伸一固定時間，並且量測表面保護膜相對於基板及/或偏光板的表面的滑移量。在一些實施例中，上述拉伸條件為：以10~60N的張力拉伸0.5~3小時。在一些實施例中，表面保護膜相對於基板及偏光板的表面的滑移量係為相同，亦即只有表面保護膜相對於基板及偏光板的表面進行滑移，偏光板相對於基板不會有滑移（滑移量趨近為零）。Regarding the step of measuring the slip amount of the surface protection film, in some embodiments, a tensile tester (eg, Tensile AGX tester made by Shimadzu) is used to stretch the surface protection film sample. First, fix the surface protection film on the tensile tester and record the position of the surface protection film, then stretch with a fixed tension for a fixed time, and measure the slippage of the surface protection film relative to the surface of the substrate and/or polarizing plate quantity. In some embodiments, the above-mentioned stretching conditions are: stretching at a tension of 10-60 N for 0.5-3 hours. In some embodiments, the slippage of the surface protection film relative to the surfaces of the substrate and the polarizer is the same, that is, only the surface protection film slips relative to the surfaces of the substrate and the polarizer, and the polarizer relative to the substrate does not slip. Slippage (slippage approaching zero).
以下針對各種用於偏光板的表面保護膜材料的樣品進行滑移量的測試，其中使用30N的張力拉伸1小時，並且量測表面保護膜相對於基板的表面的滑移量。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較滑移量量測及點燈檢查的結果。其結果表示於以下表2。藉此，可以使用表面保護膜相對於基板的滑移量作為指標，評估表面保護膜的抗雲紋特性。The following is a test of the slippage amount for various samples of the surface protection film material for polarizing plates, which are stretched with a tension of 30 N for 1 hour, and the slippage amount of the surface protection film with respect to the surface of the substrate is measured. Next, the panel including the above-mentioned various surface protection film materials was used for lighting inspection to observe whether moiré was generated, and the results of slip measurement and lighting inspection were compared. The results are shown in Table 2 below. Thereby, the anti-moire properties of the surface protection film can be evaluated using the amount of slippage of the surface protection film with respect to the substrate as an index.
表2
由表2的測試結果可以確認到，當表面保護膜滑移量大於2mm時，具有110以上的亮度不均勻度，即在進行對面板貼合時容易產生面板雲紋，造成顯示器的亮度不均勻。較佳的表面保護膜滑移量小於1mm，不產生雲紋，具有較佳的抗雲紋特性。應當理解的是，雖然在表2的實施例中是使用30N的固定張力進行拉伸，並且根據量測結果，以表面保護膜滑移量大於2mm作為是否產生雲紋的評估指標，然而在其他實施例中，也可以使用不同大小的固定張力進行滑移量的量測。因此在本揭露之表面保護膜的評估方法的其他實施例中，不僅可以使用表面保護膜滑移量作為面板是否產生雲紋的評估指標，也可以使用固定張力大小與表面保護膜滑移量的積作為評估指標，例如來自固定張力（30N）乘以表面保護膜滑移量（2mm）的60（N*mm）。From the test results in Table 2, it can be confirmed that when the slippage of the surface protective film is greater than 2mm, there is a brightness unevenness of more than 110, that is, panel moiré is easily generated when the panel is laminated, resulting in uneven brightness of the display. . The preferred surface protective film has a slippage of less than 1mm, does not generate moiré, and has better anti-moiré properties. It should be understood that although a fixed tension of 30N is used for stretching in the examples in Table 2, and according to the measurement results, the slippage of the surface protective film is greater than 2mm as the evaluation index for whether moiré is generated, but in other In the embodiment, different fixed tensions can also be used to measure the slip. Therefore, in other embodiments of the evaluation method of the surface protection film of the present disclosure, not only the slippage of the surface protection film can be used as the evaluation index of whether the panel has moiré, but also the difference between the fixed tension and the slippage of the surface protection film can be used. The product is used as an evaluation index, such as 60 (N*mm) from the fixed tension (30N) multiplied by the slippage of the surface protective film (2mm).
如上所述，本揭露提供另一種表面保護膜的評估方法，其中包括滑移量量測步驟以取得表面保護膜相對於基板的滑移量，並且將滑移量作為指標，用於進一步評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As described above, the present disclosure provides another method for evaluating a surface protection film, which includes a step of measuring slippage to obtain the slippage of the surface protection film relative to the substrate, and uses the slippage as an index for further evaluating various Anti-moire properties of surface protection film samples. Thereby, this anti-moire evaluation method can be used to evaluate whether various surface protection film materials for polarizers are prone to generate uneven brightness moiré phenomenon after the optical display device is manufactured.
除了利用硬挺度衰減率與滑移量作為表面保護膜的抗雲紋特性的指標外，由於表面保護膜張力加大可能會造成表面保護膜變形並產生厚度不均，使得所製造的面板會容易產生雲紋，造成顯示器亮度不均勻。為了解決上述問題，需要使用受到張力延伸下，形變率較小之表面保護膜。因此，在一些實施例中，可以在表面保護膜的評估方法中進一步加入形變率量測步驟，並且利用表面保護膜的形變率作為指標，評估表面保護膜的抗雲紋特性。以下將進一步詳細說明形變率的量測方式的實施例。應當理解的是，本發明所揭露的形變率的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整形變率量測步驟中所使用的參數。In addition to using the stiffness decay rate and slip amount as the indicators of the anti-moire properties of the surface protection film, the increased tension of the surface protection film may cause deformation of the surface protection film and produce uneven thickness, which makes the manufactured panel easier to Moiré is created, resulting in uneven display brightness. In order to solve the above problems, it is necessary to use a surface protection film with a small deformation rate under tension extension. Therefore, in some embodiments, a deformation rate measurement step may be further added to the evaluation method of the surface protection film, and the deformation rate of the surface protection film is used as an index to evaluate the anti-moire properties of the surface protection film. Embodiments of the deformation rate measurement method will be described in further detail below. It should be understood that the deformation rate measurement method disclosed in the present invention is not limited to the following parameters, and those with ordinary knowledge in the art can freely adjust the parameters used in the deformation rate measurement step.
在本揭露的表面保護膜的形變率量測步驟之前可先進行樣品前處理，將表面保護膜裁切成具有適合的尺寸的矩形，例如在一個實施例中，表面保護膜的尺寸可以是長度15cm且寬度5cm，其中長度方向為表面保護膜用於拉伸的加工方向（machine direction，MD）。Before the step of measuring the deformation rate of the surface protection film of the present disclosure, sample pretreatment may be performed, and the surface protection film may be cut into a rectangle with a suitable size. For example, in one embodiment, the size of the surface protection film may be a length of 15cm and 5cm in width, wherein the length direction is the machine direction (MD) of the surface protection film for stretching.
接著參照第4A、4B圖，第4A、4B圖是根據一些實施例，繪示了表面保護膜的形變率量測步驟的示意圖。在一些實施例中，使用拉伸試驗機（例如，島津製拉力AGX試驗機）以對表面保護膜樣品進行拉伸，其中拉伸力量需設定在表面保護膜材料的彈性區域內。如第4A圖所示在進行拉伸之前，可先量測表面保護膜樣品402的原始長邊長度L0與原始短邊長度W0，並且將樣品402固定於拉伸試驗機的夾具404上，其中夾具404在樣品402上的固定位置是配置為使其能在表面保護膜樣品402的加工方向MD上進行拉伸。Next, referring to FIGS. 4A and 4B , FIGS. 4A and 4B are schematic diagrams illustrating the steps of measuring the deformation rate of the surface protection film according to some embodiments. In some embodiments, a tensile testing machine (eg, Shimadzu Tensile AGX Tester) is used to stretch the surface protection film samples, wherein the tensile force is set within the elastic region of the surface protection film material. As shown in Figure 4A, before stretching, the original long side length L0 and the original short side length W0 of the surface
接著參照第4B圖，在表面保護膜樣品402的長度方向以一拉伸速度拉伸表面保護膜至一固定張力，並且在這個固定張力維持一拉伸時間。在上述拉伸時間後量測表面保護膜拉伸後的長邊長度L1與拉伸後的短邊長度W1的長度以求出表面保護膜在長邊與短邊經過拉伸後的長度變化量L1－L0、W0－W1。應當理解的是，在本揭露的實施例中並未特別限定形變率量測步驟中所使用的拉伸速度、固定張力、以及拉伸時間，本發明所屬技術領域中具有通常知識者可以根據作為樣品的表面保護膜的材料不同而選擇適合的製程參數，例如上述拉伸速度可以是1~20mm/min，固定張力可以是130~180N。在本揭露的一些實施例中，使用5mm/min的速度進行拉伸，當張力達到160N，持續以160N的張力拉伸2小時。在本揭露的另外一些實施例中，使用5mm/min的速度進行拉伸，當張力達到120N，持續以120N的張力拉伸2小時。Next, referring to FIG. 4B , the surface protection film is stretched at a stretching speed in the length direction of the surface
表面保護膜的形變率由以下式（3）所計算： 式（3）：形變率=ey/ex=（（W0－W1）/W0）/（（L1－L0）/L0） 其中ey為短邊長度變化量W0－W1除以拉伸前的原始短邊長度W0，ex為長邊長度變化量L1－L0除以拉伸前的原始長邊長度L0。 The deformation rate of the surface protective film is calculated by the following formula (3): Formula (3): Deformation rate=ey/ex=((W0－W1)/W0)/((L1－L0)/L0) Where ey is the short side length change W0-W1 divided by the original short side length W0 before stretching, ex is the long side length change L1-L0 divided by the original long side length L0 before stretching.
以下針對各種用於偏光板的表面保護膜材料的樣品進行形變率的測試，其中分別使用120N及160N的拉伸力量對各種表面保護膜樣品進行形變率的量測。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較形變率量測及點燈檢查的結果。其結果表示於以下表3。藉此，可以使用表面保護膜的形變率作為指標，評估表面保護膜的抗雲紋特性。The following tests are carried out on the samples of various surface protective film materials for polarizing plates, wherein the deformation ratios of various surface protective film samples are measured by using the tensile force of 120N and 160N respectively. Then, the panel including the above-mentioned various surface protection film materials was used for lighting inspection to observe whether moiré was generated, and the results of deformation rate measurement and lighting inspection were compared. The results are shown in Table 3 below. Thereby, the deformation rate of the surface protection film can be used as an index to evaluate the moire resistance of the surface protection film.
表3
由表3可以得知，形變率較低的表面保護膜樣品所製造出的面板較不容易產生雲紋。由表3中的測試結果可以確認到，在使用120N及160N的拉伸力量，用於量測形變率時，形變率分別為0.18及0.15以下的表面保護膜樣品所製造的面板之亮度不均勻度為50以下，具有正常（O）的雲紋評估結果，無亮度不均勻的問題；而形變率分別為0.28及0.25以上的表面保護膜樣品所製造的面板之亮度不均勻度為50以上，具有嚴重（X）或輕微（Δ）的雲紋評估結果，可以確認到亮度不均勻的光從面板穿透，即形變率較高的表面保護膜樣品所製造出的面板較容易產生雲紋。依據雲紋評估結果，顯示表面保護膜樣品形變率小於0.28較不易產生雲紋；更佳的表面保護膜樣品形變率小於0.18不產生雲紋，具有較佳的抗雲紋特性。It can be seen from Table 3 that the panels produced by the surface protection film samples with lower deformation rate are less likely to generate moiré. From the test results in Table 3, it can be confirmed that when the tensile force of 120N and 160N is used to measure the deformation rate, the brightness of the panels manufactured by the surface protection film samples with the deformation rate of 0.18 and 0.15 or less, respectively, is not uniform. The degree of brightness is below 50, with a normal (O) moiré evaluation result, and there is no problem of uneven brightness; while the brightness unevenness of the panels produced by the surface protection film samples with deformation rates of 0.28 and 0.25, respectively, is above 50, With severe (X) or slight (Δ) moiré evaluation results, it can be confirmed that light with uneven brightness penetrates through the panel, that is, the panel produced by the surface protection film sample with higher deformation rate is more prone to moiré. According to the evaluation results of moiré, it is shown that the surface protective film sample with deformation rate less than 0.28 is less likely to produce moiré; the better surface protective film sample with deformation rate less than 0.18 does not produce moire, and has better anti-moire characteristics.
如上所述，本揭露提供另一種表面保護膜的評估方法，其中包括形變率量測步驟以取得表面保護膜的形變率，並且將形變率作為指標，用於進一步評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As described above, the present disclosure provides another method for evaluating a surface protection film, which includes a deformation rate measurement step to obtain the deformation rate of the surface protection film, and uses the deformation rate as an index for further evaluating the resistance of various surface protection film samples. Moiré characteristics. Thereby, this anti-moire evaluation method can be used to evaluate whether various surface protection film materials for polarizers are prone to generate uneven brightness moiré phenomenon after the optical display device is manufactured.
應當理解的是，本領域中具有通常知識者可以單獨使用在本揭露中所提供的硬挺度衰減率量測步驟、滑移量量測步驟、或形變率量測步驟以評估表面保護膜的抗雲紋特性，也可以使用上述硬挺度衰減率量測步驟、滑移量量測步驟、以及形變率量測步驟的任意組合以綜合評估表面保護膜的抗雲紋特性。藉由同時以表面保護膜的硬挺度衰減率、滑移量、以及形變率等當中的複數個性質作為評估表面保護膜的抗雲紋特性的指標，可以使判斷表面保護膜樣品是否會產生雲紋的評估結果更加準確。It should be understood that those with ordinary knowledge in the art can independently use the stiffness decay rate measurement step, slip measurement step, or deformation rate measurement step provided in the present disclosure to evaluate the resistance of the surface protection film. For moire characteristics, any combination of the above-mentioned stiffness decay rate measurement steps, slippage measurement steps, and deformation rate measurement steps can also be used to comprehensively evaluate the moire resistance of the surface protective film. By using the stiffness decay rate, slippage, and deformation rate of the surface protection film as indicators to evaluate the anti-moiré properties of the surface protection film at the same time, it is possible to judge whether the surface protection film sample will generate clouds. The evaluation results of the wrinkles are more accurate.
雖然本發明以前述數個較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可做些許之更動與潤飾。因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。此外，每個申請專利範圍建構成一獨立的實施例，且各種申請專利範圍及實施例之組合皆介於本發明之範圍內。Although the present invention is disclosed in the foregoing several preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the appended patent application. Furthermore, each claimable scope constitutes a separate embodiment, and various claims and combinations of embodiments are intended to be within the scope of the present disclosure.
102:樣品（筒狀樣品） 104,404:夾具 104-1:下部 104-2:上部 302:偏光板 304:顯示面板 306:背光模組 308:相機 402:樣品 A:硬挺度衰減區 D:距離 h1:第一高度 h2:第二高度 L:光 L0:原始長邊長度 L1:拉伸後的長邊長度 S1,S2,S3,S4:步驟 W0:原始短邊長度 W1:拉伸後的短邊長度 102: Sample (cylindrical sample) 104,404: Fixtures 104-1: Lower part 104-2: Upper part 302: polarizer 304: Display panel 306: Backlight module 308: Camera 402: Sample A: Stiffness attenuation area D: distance h1: first height h2: second height L: light L0: Original long side length L1: The length of the long side after stretching S1, S2, S3, S4: Steps W0: original short side length W1: The length of the short side after stretching
以下將配合所附圖式詳述本揭露實施例。應注意的是，依據在業界的標準做法，各種特徵並未按照比例繪製且僅用以說明例示。事實上，可能任意地放大或縮小元件的尺寸，以清楚地表現出本揭露實施例的特徵。 第1圖是根據一些實施例，繪示了表面保護膜的硬挺度衰減率量測步驟的示意圖。 第2圖是根據一個實施例，繪示了表面保護膜硬挺度對時間的關係之實際量測的圖表。 第3A、3B圖是根據一些實施例，對面板進行點燈檢查的結果的影像。 第4A、4B圖是根據一些實施例，繪示了表面保護膜的形變率量測步驟的示意圖。 The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, in accordance with standard practice in the industry, the various features are not drawn to scale and are illustrative only. In fact, the dimensions of elements may be arbitrarily enlarged or reduced to clearly represent the features of the disclosed embodiments. FIG. 1 is a schematic diagram illustrating the steps of measuring the stiffness decay rate of the surface protection film according to some embodiments. FIG. 2 is a graph illustrating actual measurement of surface protection film stiffness versus time, according to one embodiment. Figures 3A and 3B are images of the results of lighting inspection of a panel according to some embodiments. FIGS. 4A and 4B are schematic diagrams illustrating the steps of measuring the deformation rate of the surface protection film according to some embodiments.
102:樣品(筒狀樣品) 102: Sample (cylindrical sample)
104:夾具 104: Fixtures
104-1:下部 104-1: Lower part
104-2:上部 104-2: Upper part
h1:第一高度 h1: first height
h2:第二高度 h2: second height
S1,S2,S3:步驟 S1, S2, S3: Steps
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| JP2016200709A (en) * | 2015-04-10 | 2016-12-01 | コニカミノルタ株式会社 | Polarizing plate protective film and polarizing plate having the same, and method for producing the polarizing plate protective film |
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