TW201428354A - Diffusion film and polarizing plate using the same - Google Patents

Diffusion film and polarizing plate using the same Download PDF

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TW201428354A
TW201428354A TW102148099A TW102148099A TW201428354A TW 201428354 A TW201428354 A TW 201428354A TW 102148099 A TW102148099 A TW 102148099A TW 102148099 A TW102148099 A TW 102148099A TW 201428354 A TW201428354 A TW 201428354A
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light
film
diffusion film
diffusion
meth
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TW102148099A
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Chinese (zh)
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Geo-San Lim
Seung-Hee Kim
Byoung-Sun Jung
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Dongwoo Fine Chem Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G02B1/105—
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

Provided is a diffusion film having a reflectance parameter (X) of 75 to 95, the reflectance parameter (X) being defined by (A/B) X 100, wherein A is a value obtained by measuring the reflectance (%) of lights reflected in all directions except a light reflected in a direction of 8 DEG with respect the normal line of a surface of the diffusion film when the lights are incident to the surface of the diffusion film, using an integrating sphere, and B is a value obtained by measuring the reflectance (%) of lights in all directions when the light is incident to the surface of the diffusion film, using an integrating sphere.

Description

擴散膜及使用該擴散膜的偏光板 Diffusion film and polarizing plate using the same

本發明關於一種擴散膜及包含該擴散膜的偏光板。 The present invention relates to a diffusion film and a polarizing plate comprising the same.

影像顯示裝置包括液晶顯示器、電致發光顯示器、電漿顯示面板、場致發射顯示器等等。 Image display devices include liquid crystal displays, electroluminescent displays, plasma display panels, field emission displays, and the like.

這些不同類型的影像顯示裝置暴露於外部光，如自然光或照明光的情況下，光入射到影像顯示裝置的表面被反射，由於影像反射，造成對比度劣化和可視性降低。此外，螢幕閃爍及文字識別難度大，導致增加眼睛的疲勞或誘發頭痛。 When these different types of image display devices are exposed to external light, such as natural light or illumination light, light is incident on the surface of the image display device, and contrast is deteriorated and visibility is lowered due to image reflection. In addition, screen flicker and text recognition are difficult, resulting in increased eye fatigue or induced headaches.

為了解決這些問題，一種擴散膜已被主要用於減少光的反射。當抗眩膜被佈置在影像顯示裝置的表面時，藉由允許表面突起，以誘導不規則的反射。 In order to solve these problems, a diffusion film has been mainly used to reduce reflection of light. When the anti-glare film is disposed on the surface of the image display device, irregular surface reflection is induced by allowing the surface to protrude.

同時，霧度的測量已被廣泛用於評估擴散膜之光學特性的相關技術中。然而，在實際的顯示裝置中，由於外部光的反射，霧度測量不能絕對地反映影像劣化現象 Meanwhile, the measurement of haze has been widely used in the related art for evaluating the optical characteristics of the diffusion film. However, in an actual display device, haze measurement cannot absolutely reflect image degradation due to reflection of external light.

除了霧度測量，透光-清晰度也被用於評估光學特性。韓國專利公開號第2009-0069227號揭露一種抗眩膜，當光學膜的整體霧度指定為H%且透光-清晰度指定為Tc%時，滿足Tc8H。上述參數具有反映可視性至 光學膜的表面反射之優點。 In addition to haze measurement, light transmission-sharpness is also used to evaluate optical properties. Korean Patent Publication No. 2009-0069227 discloses an anti-glare film which satisfies Tc when the overall haze of the optical film is specified as H% and the light transmission-sharpness is specified as Tc%. 8H. The above parameters have the advantage of reflecting the visibility to the surface reflection of the optical film.

然而，這些參數僅使用關於光傳輸的資訊，因而當與直接測量反射光相較時，具有低靈敏度的可視性反映。 However, these parameters only use information about the optical transmission, and thus have a low sensitivity visibility when compared to directly measuring the reflected light.

於是，本發明是為了解決現有技術中存在的上述問題，本發明的一個態樣是提供一種擴散膜，能夠具有優異的抗眩光特性和卓越的擴散性，反映由於外部光線反射導致的圖像劣化現象，從而儘管有強烈的外部光，確保足夠的可視性，並具有從顯示裝置各方向優良的可視性，如同從其前側一般。 Accordingly, the present invention has been made to solve the above problems in the prior art, and an aspect of the present invention is to provide a diffusion film which can have excellent anti-glare characteristics and excellent diffusibility, reflecting image deterioration due to reflection of external light. Phenomenon, thus, despite strong external light, ensures adequate visibility and excellent visibility from all directions of the display device, as is the case from its front side.

根據本發明的一個態樣，提供具有75~95的反射率參數(X)的一種擴散膜，該反射率參數(X)由方程式1所定義：[方程式1]反射率參數(X)=(A/B)X 100 According to an aspect of the present invention, there is provided a diffusion film having a reflectance parameter (X) of 75 to 95, the reflectance parameter (X) being defined by Equation 1: [Equation 1] Reflectance parameter (X) = ( A/B) X 100

其中A為使用積分球，當光線入射到擴散膜的表面時，由量測除了反射自擴散膜表面法線8°方向外各方向反射的光線之反射率(%)而獲得的數值，B為使用積分球，當光線入射到擴散膜的表面時，由量測各方向反射的光線之反射率(%)而獲得的數值。 Where A is the use of an integrating sphere. When light is incident on the surface of the diffusing film, the value obtained by measuring the reflectance (%) of the light reflected in each direction other than the normal direction of the surface of the diffusing film 8° is measured, B is The value obtained by measuring the reflectance (%) of the light reflected in each direction when the light is incident on the surface of the diffusion film using the integrating sphere.

反射率參數(X)可以是80~90。 The reflectance parameter (X) can be 80 to 90.

擴散膜可包括一擴散層，在相對於100重量百分比之擴散層總組成中，該擴散膜包含15~80重量百分比的一透光樹脂，及3~30重量百分比的透光顆粒。 The diffusion film may include a diffusion layer containing 15 to 80% by weight of a light-transmitting resin and 3 to 30% by weight of the light-transmitting particles in a total composition of 100% by weight of the diffusion layer.

透光顆粒的平均粒徑可為1~10μm。 The light-transmitting particles may have an average particle diameter of 1 to 10 μm.

擴散層的厚度可為1~20μm。 The thickness of the diffusion layer may be 1 to 20 μm.

根據本發明的另一個態樣，包含該擴散膜的一偏光板。 According to another aspect of the invention, a polarizing plate comprising the diffusing film.

本發明是針對一種具有75~95，反射率參數(X)的擴散膜，該反射率參數(X)由方程式1所定義：[方程式1]反射率參數(X)=(A/B)X 100 The present invention is directed to a diffusing film having a reflectance parameter (X) of 75 to 95. The reflectance parameter (X) is defined by Equation 1: [Equation 1] Reflectance parameter (X) = (A/B) X 100

其中A為使用積分球，當光線入射到擴散膜的表面時，由量測除了反射自擴散膜表面法線8°方向外各方向反射的光線之反射率(%)而獲得的數值，B為使用積分球，當光線入射到擴散膜的表面時，由量測各方向反射的光線之反射率(%)而獲得的數值。 Where A is the use of an integrating sphere. When light is incident on the surface of the diffusing film, the value obtained by measuring the reflectance (%) of the light reflected in each direction other than the normal direction of the surface of the diffusing film 8° is measured, B is The value obtained by measuring the reflectance (%) of the light reflected in each direction when the light is incident on the surface of the diffusion film using the integrating sphere.

“當光線入射到擴散膜的表面時，除了反射自擴散膜表面法線8°方向外各方向反射的光線，使用積分球量測”意謂光線散射在擴散膜表面上。因此，反射率參數(X)表示為基於所有反射在擴散膜表面上的散射光線量之百分比。 "When light is incident on the surface of the diffusion film, the light reflected in all directions except the direction of the normal of the diffusion film surface by 8°, using the integrating sphere measurement means that the light is scattered on the surface of the diffusion film. Therefore, the reflectance parameter (X) is expressed as a percentage based on the amount of scattered light on the surface of the diffusion film for all reflections.

依照本發明的一個態樣，反射率參數(X)可為75~95，最好是80~90。如果反射率參數(X)小於75，擴散性可能會變差，因而顯示設備的可視性在強烈外部光下可能會惡化。如果反射率參數(X)大於95， 該顯示裝置的白化可能會惡化，從而導致減少透射率。 According to one aspect of the invention, the reflectance parameter (X) can be from 75 to 95, preferably from 80 to 90. If the reflectance parameter (X) is less than 75, the diffusibility may be deteriorated, and thus the visibility of the display device may deteriorate under strong external light. If the reflectance parameter (X) is greater than 95, The whitening of the display device may be deteriorated, resulting in a decrease in transmittance.

擴散膜具有包含用於形成擴散層的組合物之擴散層，該組合物包含透光樹脂與透光顆粒。 The diffusion film has a diffusion layer containing a composition for forming a diffusion layer, the composition comprising a light transmissive resin and light transmissive particles.

透光樹脂是一種光固化型樹脂，可包括光固化型(甲基)丙烯酸酯低聚物和單體。 The light-transmitting resin is a photocurable resin and may include a photocurable (meth) acrylate oligomer and a monomer.

關於光固化型(甲基)丙烯酸酯低聚物，環氧(甲基)丙烯酸酯、氨基甲酸(甲基)丙烯酸酯等等。氨基甲酸(甲基)丙烯酸酯可能較好。氨基甲酸(甲基)丙烯酸酯可藉使用具有一羥基在其分子中的多官能(甲基)丙烯酸酯，與一種具有異一氰酸酯基的化合物，在催化劑的存在下而製備。具有一羥基在其分子中的(甲基)丙烯酸之具體例子可以是一或多個選自由2-羥乙基(甲基)丙烯酸酯、2-羥基異丙基(甲基)丙烯酸、4-羥丁基(甲基)丙烯酸酯、己內酯開環羥基丙烯酸、季戊四醇三/四(甲基)丙烯酸酯混合物，及二季戊四醇五/六(甲基)丙烯酸酯混合物所組成的群組。此外，具有一異氰酸酯基之化合物的具體例子可以是一或多個選自由1,4-二異氰酸丁烷、1,6-二異氰酸己烷、1,8-二異氰酸辛烷、1,12-1,12-二異氰酸十二烷、1,5-二異氰酸基-2-甲基戊烷、三甲基-1,6-二異氰酸己烷、1,3-雙(異氰酸甲基)環己烷、反式-1,4-環己烯二異氰酸酯、4,4'-亞甲基雙(環己基異氰酸酯)、異佛爾酮二異氰酸酯、甲苯-2,4-二異氰酸酯、甲苯-2,6-二異氰酸酯、二甲苯基-1,4-二異氰酸酯、四甲基-1,3-二異氰酸酯、1-氯甲基-1,4-二異氰酸酯、4,4'-亞甲基雙(2,6-二甲基苯基異氰酸酯)、4,4'-氧雙(異氰酸苯酯)、來自六亞甲基二異氰酸酯的三官能的二異氰酸及甲苯二異氰酸酯的三羥甲基丙烷加成物所組成的群組。 As the photocurable (meth) acrylate oligomer, epoxy (meth) acrylate, urethane (meth) acrylate, and the like. Carbamate (meth) acrylate may be preferred. The urethane (meth) acrylate can be prepared by using a polyfunctional (meth) acrylate having a hydroxyl group in its molecule, and a compound having an iso-cyanate group in the presence of a catalyst. A specific example of the (meth)acrylic acid having a monohydroxy group in its molecule may be one or more selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxyisopropyl (meth) acrylate, 4- A group consisting of hydroxybutyl (meth) acrylate, caprolactone ring-opened hydroxy acrylate, pentaerythritol tri/tetra(meth) acrylate mixture, and dipentaerythritol penta/hexa (meth) acrylate mixture. Further, a specific example of the compound having an isocyanate group may be one or more selected from the group consisting of butane 1,4-diisocyanate, hexane 1,6-diisocyanate, and octane 1,8-diisocyanate. 1,12-1,12-diisocyanate, 1,5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1 , 3-bis(isocyanatomethyl)cyclohexane, trans-1,4-cyclohexene diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), isophorone diisocyanate, Toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylyl-1,4-diisocyanate, tetramethyl-1,3-diisocyanate, 1-chloromethyl-1,4- Diisocyanate, 4,4'-methylenebis(2,6-dimethylphenylisocyanate), 4,4'-oxybis(phenylisocyanate), trifunctional from hexamethylene diisocyanate A group consisting of a trimethylolpropane adduct of diisocyanate and toluene diisocyanate.

關於單體，任何一般能使用的單體皆能被使用。例如，具有如一光固化性官能基、一不飽和基團，如(甲基)丙烯醯基、一乙烯基、一苯乙烯基、一烯丙基等等的單體，可以被使用。其中，具有(甲基)丙烯醯基的單體較好。 Regarding the monomer, any monomer which can be generally used can be used. For example, a monomer having, for example, a photocurable functional group, an unsaturated group such as (meth)acryl fluorenyl group, monovinyl group, monostyryl group, monoallyl group or the like can be used. Among them, a monomer having a (meth) acrylonitrile group is preferred.

具有(甲基)丙烯醯基的單體具體例子可以是一或多個選自由新戊二醇二丙烯酸酯、1,6-己二醇(甲基)丙烯酸酯、丙二醇二(甲基)丙烯酸酯、三乙二醇二(甲基)丙烯酸酯、二丙二醇二(甲基)丙烯酸酯、聚乙二醇二(甲基)丙烯酸酯、聚丙二醇二(甲基)丙烯酸、三羥甲基丙烷三(甲基)丙烯酸酯、三羥甲基乙烷三(甲基)丙烯酸酯、1,2,4-環己烷四(甲基)丙烯酸酯、五甘油三(甲基)丙烯酸酯、季戊四醇四(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、二季戊四醇三(甲基)丙烯酸酯、二季戊四醇五(甲基)丙烯酸酯、二季戊四醇四(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、三季戊四醇三(甲基)丙烯酸酯、三季戊四醇六三(甲基)丙烯酸酯、雙(2-羥乙基)異氰脲酸酯二(甲基)丙烯酸酯、羥乙基(甲基)丙烯酸酯、羥丙基(甲基)丙烯酸酯、羥丁基(甲基)丙烯酸酯、異辛基(甲基)丙烯酸酯、異癸基(甲基)丙烯酸酯、硬脂基(甲基)丙烯酸酯、四氫糠基(甲基)丙烯酸酯、苯氧基乙基(甲基)丙烯酸酯及異冰片(甲基)丙烯酸酯所組成的群組。 Specific examples of the monomer having a (meth)acrylinyl group may be one or more selected from the group consisting of neopentyl glycol diacrylate, 1,6-hexanediol (meth)acrylate, and propylene glycol di(meth)acrylic acid. Ester, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylic acid, trimethylolpropane Tris(meth)acrylate, trimethylolethane tri(meth)acrylate, 1,2,4-cyclohexanetetra(meth)acrylate, pentaglycerol tri(meth)acrylate, pentaerythritol Tetrakis (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol (meth) acrylate, tripentaerythritol tri(meth) acrylate, tripentaerythritol hexatri(meth) acrylate, bis(2-hydroxyethyl) isocyanurate di(meth) acrylate, hydroxy Ethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, isooctyl (meth) acrylate Isodecyl (meth) acrylate, stearyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, phenoxy ethyl (meth) acrylate and isobornyl (meth) acrylate a group of esters.

光固化型(甲基)丙烯酸酯低聚物和單體作為透光樹脂的例子可被單獨使用或使用於在兩種或更多種的組合中。 The photocurable (meth) acrylate oligomer and monomer as an example of the light transmissive resin may be used singly or in combination of two or more.

關於透光顆粒，任何能被用在本領域中且提供抗眩性質的顆粒，都可被使用而無限制。關於透光顆粒，例如，二氧化矽粒子、矽樹脂 粒子、三聚氰胺類樹脂粒子、丙烯酸類樹脂粒子、苯乙烯類樹脂粒子、丙烯酸-苯乙烯類樹脂粒子、聚碳酸酯類樹脂粒子、聚乙烯類樹脂顆粒、氯乙烯類樹脂粒子等等可被使用。透光顆粒的例子可以是單獨使用或兩種或更多種的混合使用。 Regarding the light-transmitting particles, any particles which can be used in the art and which provide anti-glare properties can be used without limitation. Regarding light-transmitting particles, for example, cerium oxide particles, cerium resin Particles, melamine resin particles, acrylic resin particles, styrene resin particles, acrylic-styrene resin particles, polycarbonate resin particles, polyethylene resin particles, vinyl chloride resin particles and the like can be used. Examples of the light-transmitting particles may be used singly or in combination of two or more.

透光顆粒的平均顆粒直徑最好在1~10μm。如果透光顆粒的平均顆粒直徑小於1μm，凹面-凸面難以形成於擴散層的表面，導致防眩性質的惡化。如果透光顆粒的平均顆粒直徑大於10μm，，擴散層表面粗糙，導致降低顯示設備的質感。 The average particle diameter of the light-transmitting particles is preferably from 1 to 10 μm. If the average particle diameter of the light-transmitting particles is less than 1 μm, the concave-convex surface is difficult to form on the surface of the diffusion layer, resulting in deterioration of anti-glare properties. If the average particle diameter of the light-transmitting particles is more than 10 μm, the surface of the diffusion layer is rough, resulting in a decrease in the texture of the display device.

透光顆粒的含量相對於100重量百分比的透光樹脂最好為5~100重量百分比。 The content of the light-transmitting particles is preferably from 5 to 100% by weight based on 100% by weight of the light-transmitting resin.

小於透光樹脂的15重量百分比可能達不到足夠的改良硬度。超過透光樹脂的80重量百分比可能會惡化塗佈性。此外，小於透光顆粒的5重量百分比可能惡化擴散性，超過透光顆粒的100重量百分比可能無法充分固化擴散層，導致未能獲得足夠的硬度。 Less than 15% by weight of the light-transmitting resin may not achieve sufficient improved hardness. More than 80% by weight of the light-transmitting resin may deteriorate the coatability. Further, less than 5 weight percent of the light-transmitting particles may deteriorate the diffusibility, and 100% by weight of the light-transmitting particles may not sufficiently cure the diffusion layer, resulting in failure to obtain sufficient hardness.

用於形成擴散層的組合物可進一步包含一光引發劑。關於光引發劑，任一種可以使用在本領域中的皆可使用，沒有限制。引發劑的具體例子可以包括至少一種選自由2-甲基-1-4-(甲硫基)苯基]-2-嗎啉基丙烷-1、二苯甲酮芐基二甲基縮酮、2-羥基-2-甲基-1-苯基丙烷-1-酮、4-羥基環己基苯基酮、二甲氧基-2-苯基苯乙酮、蒽醌、三苯胺、咔唑、芴、3-甲基苯乙酮、4-氯乙醯苯酮、4,4-二甲氧基苯乙酮、4,4-二氨基二苯甲酮、1-羥基環己基苯基酮及二苯甲酮所組成的群組。 The composition for forming the diffusion layer may further comprise a photoinitiator. Regarding the photoinitiator, any one which can be used in the art can be used without limitation. Specific examples of the initiator may include at least one selected from the group consisting of 2-methyl-1-4-(methylthio)phenyl]-2-morpholinylpropane-1, benzophenonebenzyldimethylketal, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 4-hydroxycyclohexyl phenyl ketone, dimethoxy-2-phenylacetophenone, anthracene, triphenylamine, carbazole,芴, 3-methylacetophenone, 4-chloroacetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone and A group consisting of benzophenone.

光引發劑的含量相對於100重量百分比的擴散層總組成最好 為0.1到10重量百分比。小於0.1重量百分比，光引發劑可能降低固化速度。大於10重量百分比，由於過度固化，光引發劑可能導致裂紋發生在擴散層中。 The photoinitiator content is preferably the same as the total composition of the diffusion layer of 100% by weight. It is from 0.1 to 10% by weight. Less than 0.1 weight percent, the photoinitiator may reduce the rate of cure. Above 10% by weight, the photoinitiator may cause cracks to occur in the diffusion layer due to excessive curing.

為了提高分散性和塗佈性，用於形成擴散層的組合物可被使用稀釋在溶劑中。關於溶劑，任何已知材料使用為用於形成擴散層的組合物領域中的溶劑，都可以被使用而無限制。 In order to improve dispersibility and coatability, the composition for forming a diffusion layer may be diluted in a solvent to be used. Regarding the solvent, any known material used as a solvent in the field of a composition for forming a diffusion layer can be used without limitation.

溶劑的具體例子可以包括醇類(甲醇、乙醇、異丙醇、丁醇、甲基溶纖劑、乙基溶纖劑等)、酮類(甲基乙基酮、甲基丁基酮、甲基異丁基酮、二乙基酮、二丙基酮、環己酮等)、己烷類(己烷、庚烷、辛烷等)及苯類(苯、甲苯、二甲苯等)等等，他們可被單獨使用或使用於在兩種或更多種的組合中。 Specific examples of the solvent may include alcohols (methanol, ethanol, isopropanol, butanol, methyl cellosolve, ethyl cellosolve, etc.), ketones (methyl ethyl ketone, methyl butyl ketone, A) Heterobutyl ketone, diethyl ketone, dipropyl ketone, cyclohexanone, etc.), hexanes (hexane, heptane, octane, etc.) and benzenes (benzene, toluene, xylene, etc.), etc. They can be used alone or in combination of two or more.

溶劑的容量相對於100重量百分比的擴散層總組成可為10~95重量百分比。小於10重量百分比，由於高黏度，溶劑可能會劣化加工性。超過95重量百分比，溶劑可能使固化過程非常耗時，導致惡化經濟的可行性。 The capacity of the solvent may be from 10 to 95% by weight based on 100% by weight of the total composition of the diffusion layer. Less than 10% by weight, the solvent may deteriorate workability due to high viscosity. Above 95% by weight, the solvent may make the curing process very time consuming, resulting in a deteriorating economic viability.

擴散層可由塗佈用於形成擴散層的組合物稀釋在溶劑中的溶液，至透明基膜的一表面而形成，之後進行乾燥與紫外光固化。擴散層的厚度最好在1~20μm。 The diffusion layer may be formed by coating a solution in which a composition for forming a diffusion layer is diluted in a solvent to a surface of the transparent base film, followed by drying and ultraviolet curing. The thickness of the diffusion layer is preferably from 1 to 20 μm.

本發明提供一種具有依照本發明的擴散膜的偏光板。即，本發明的偏光板可由層壓結合前述依照本發明的擴散膜於一般偏光片的一或二表面上而製造。偏光片可以在其至少一個表面上設置有一保護膜。 The present invention provides a polarizing plate having a diffusion film in accordance with the present invention. That is, the polarizing plate of the present invention can be produced by laminating the above-described diffusion film according to the present invention on one or both surfaces of a general polarizer. The polarizer may be provided with a protective film on at least one surface thereof.

以下，本發明將經由實例和比較實例，進行更詳細地說明。 下面的實例僅具說明性與描述性，不應用來限制或限定本發明的範圍。 Hereinafter, the present invention will be explained in more detail by way of examples and comparative examples. The following examples are merely illustrative and illustrative and are not intended to limit or limit the scope of the invention.

實例1 Example 1

一種用於形成擴散層的組合物由使用攪拌棒混合20重量百分比的聚氨酯丙烯酸酯(Miwon商業公司，產品：M340)、20重量百分比的季戊四醇三丙烯酸酯(Miwon商業公司，產品：M340)、4重量百分比的透光顆粒(矽樹脂顆粒，Momentive公司，產品：Tospearl 145，折射率：1.43，平均顆粒直徑：4.5μm)、20重量百分比的甲基乙基酮(Daejung化學及金屬公司)、27重量百分比的丙二醇單甲基醚(Daejung化學及金屬公司)、2.5重量百分比的光引發劑(Siba公司，產品：PU620I-184)及0.5重量百分比的勻染劑(BYK化學公司，產品：PU620BYK3550)而製備，接著經過一PP材料過濾器而過濾。 A composition for forming a diffusion layer was prepared by mixing 20 weight percent of urethane acrylate (Miwon Commercial Co., product: M340), 20 weight percent of pentaerythritol triacrylate (Miwon Commercial Company, product: M340), 4 using a stir bar. Percent by weight of light-transmitting particles (yen resin particles, Momentive, product: Tospearl 145, refractive index: 1.43, average particle diameter: 4.5 μm), 20% by weight of methyl ethyl ketone (Daejung Chemical and Metal Co., Ltd.), 27 5% by weight of propylene glycol monomethyl ether (Daejung Chemical and Metal Co., Ltd.), 2.5% by weight of photoinitiator (Siba, product: PU620I-184) and 0.5% by weight of leveling agent (BYK Chemical Co., product: PU620BYK3550) The preparation was followed by filtration through a PP material filter.

製備用於形成擴散層的組合物被塗佈一層60μm-厚的三醋酸纖維素膜，這樣該樹脂層厚度為3.8μm，接著於70℃下進行2分鐘乾燥溶劑。該乾燥膜於400mJ/cm2的積分光下照射紫外線光，因而製造具有擴散層的擴散膜。 The composition for forming a diffusion layer was coated with a 60 μm-thick cellulose triacetate film such that the thickness of the resin layer was 3.8 μm, followed by drying the solvent at 70 ° C for 2 minutes. The dried film was irradiated with ultraviolet light under integrated light of 400 mJ/cm 2 to thereby produce a diffusion film having a diffusion layer.

實例2 Example 2

一種擴散膜由相同於實例1中的方法所製造，除了樹脂層厚度為2.5μm。 A diffusion film was produced by the same method as in Example 1 except that the thickness of the resin layer was 2.5 μm.

實例3 Example 3

一種擴散膜由相同於實例1中的方法所製造，除了透光顆粒為球形聚甲基丙烯酸甲酯-苯乙烯共聚物粒子(XX-1735Z，Sekisui Tech聚合物公司，折射率：1.51，平均顆粒直徑：4.5μm)。 A diffusion film was produced by the same method as in Example 1, except that the light-transmitting particles were spherical polymethyl methacrylate-styrene copolymer particles (XX-1735Z, Sekisui Tech Polymer Co., Ltd., refractive index: 1.51, average particle size). Diameter: 4.5 μm).

實例4 Example 4

一種擴散膜由相同於實例1中的方法所製造，除了樹脂層厚度為1.5μm。 A diffusion film was produced by the same method as in Example 1, except that the thickness of the resin layer was 1.5 μm.

實例5 Example 5

一種擴散膜由相同於實例3中的方法所製造，除了樹脂層厚度為1.5μm。 A diffusion film was produced by the same method as in Example 3 except that the thickness of the resin layer was 1.5 μm.

比較實例1 Comparative example 1

一種擴散膜由相同於實例1中的方法所製造，除了樹脂層厚度為1μm。 A diffusion film was produced by the same method as in Example 1 except that the resin layer had a thickness of 1 μm.

比較實例2 Comparative example 2

一種擴散膜由相同於實例1中的方法所製造，除了透光顆粒為非晶矽粒子(Silysia 550，Fuji Silysia公司，折射率：1.46，平均顆粒直徑：3.9μm)。 A diffusion film was produced by the same method as in Example 1, except that the light-transmitting particles were amorphous cerium particles (Silysia 550, Fuji Silysia, refractive index: 1.46, average particle diameter: 3.9 μm).

一個黑色丙烯酸板結合至製造的擴散膜之後表面，反射率A與B由使用一分光光度計(Konica Minolta公司，CM-3700d)而量測。 A black acrylic plate was bonded to the surface of the manufactured diffusion film, and the reflectances A and B were measured using a spectrophotometer (Konica Minolta, CM-3700d).

反射率A為使用積分球，當光線入射到擴散膜的表面時，由量測除了反射自擴散膜表面法線8°方向外各方向反射的光線之反射率(%)而獲得。反射率B為使用積分球，當光線入射到擴散膜的表面時，由量測各方向反射的光線之反射率(%)而獲得。 The reflectance A is obtained by using an integrating sphere, and when light is incident on the surface of the diffusing film, it is obtained by measuring the reflectance (%) of light reflected in each direction except the reflection from the normal direction of the surface of the diffusing film by 8°. The reflectance B is obtained by using an integrating sphere, and measuring the reflectance (%) of light reflected in each direction when light is incident on the surface of the diffusing film.

特別是反射率A與B依照ISO標準d/8結構而量測，脈衝氙燈用作為光源。一6英吋積分球依照SCE方法，在10nm的間隔，從360nm到740nm，用來量測反射率A。由波長量測的反射率A與B值轉化為由CIE 1931 標準色度學系統所計算的Y值。 In particular, the reflectances A and B were measured in accordance with the ISO standard d/8 structure, and the pulse xenon lamp was used as a light source. A 6-inch integrating sphere is used to measure the reflectance A according to the SCE method at intervals of 10 nm from 360 nm to 740 nm. Reflectance A and B values measured by wavelength are converted to CIE 1931 The Y value calculated by the standard colorimetric system.

量測之A與B的值是用來計算由方程式1所定義的反射率參數(X)，並表列於表1中。 The measured values of A and B are used to calculate the reflectance parameter (X) defined by Equation 1 and are listed in Table 1.

實驗實例 Experimental example

製造於上述實例及比較實例中的抗眩膜之物理性質，如下般地測量之，其結果表列於表2中。量測及評估進行如下。 The physical properties of the anti-glare film produced in the above examples and comparative examples were measured as follows, and the results are shown in Table 2. Measurement and evaluation are performed as follows.

(1)擴散膜霧度之量測 (1) Measurement of haze of diffusion film

每一製造於上述實例及比較實例中的擴散膜的霧度值，由使用Sga公司製造的HZ-1-霧度儀而量測。塗覆膜的霧度值與塗覆膜的濁度相關，較高的霧度值意謂著該膜較混濁。 The haze value of each of the diffusion films manufactured in the above examples and comparative examples was measured by using an HZ-1-haze meter manufactured by Sga Corporation. The haze value of the coated film is related to the turbidity of the coated film, and the higher haze value means that the film is more turbid.

(2)擴散膜透光-清晰度之量測 (2) Diffusion film transmission - the measurement of clarity

總透光率由使用用於每一製造於上述實例及比較實例中的擴散膜的霧度計(HZ-1，Sga公司)的TT值而量測。較高的總透光率意味穿透該膜光線的透光率較高，從而該膜是透明的。可以確認較低的總透光率 導致白化現象變的更糟。 The total light transmittance was measured by a TT value using a haze meter (HZ-1, Sga Corporation) for each of the diffusion films manufactured in the above examples and comparative examples. A higher total light transmission means that the light transmittance through the film is higher, so that the film is transparent. Can confirm lower total light transmittance The whitening phenomenon is getting worse.

小於85%的透光率意謂著白化現象更為糟糕，不小於90%的透光率意謂著白化現象微不足道。 A light transmittance of less than 85% means that the whitening phenomenon is even worse, and a light transmittance of not less than 90% means that the whitening phenomenon is negligible.

(3)經擴散膜前表面擴散性之視覺評估 (3) Visual assessment of the diffusivity of the front surface of the diffuser film

每一製造於上述實例及比較實例中的擴散膜被結合到黑色丙烯酸板。接著，三波長落地燈設置於傾斜於擴散膜表面法線20°的方向。 接著，查核落地燈形狀的清晰度，該形狀被反射於正反射角度(-20°)。 Each of the diffusion films fabricated in the above examples and comparative examples was bonded to a black acrylic plate. Next, the three-wavelength floor lamp was placed in a direction inclined at 20° to the normal to the surface of the diffusion film. Next, check the sharpness of the shape of the floor lamp, which is reflected at the regular reflection angle (-20°).

[評估] [assessment]

擴散性◎：落地燈的輪廓被扭曲，因此光的位置是不可確認的。 Diffusion ◎: The outline of the floor lamp is distorted, so the position of the light is unconfirmable.

擴散性○：落地燈的輪廓被扭曲，但光源的位置是可確認的。 Diffusion ○: The outline of the floor lamp is distorted, but the position of the light source is identifiable.

擴散性X：落地燈的輪廓是清晰可辨。 Diffusion X: The outline of the floor lamp is clearly legible.

(4)經擴散膜傾斜表面擴散性之視覺評估 (4) Visual assessment of the diffuse surface diffusivity of the diffuser film

每一製造於上述實例及比較實例中的擴散膜被結合到黑色丙烯酸板。接著，三波長落地燈設置於傾斜於擴散膜表面法線80°的方向。接著，查核落地燈形狀的清晰度，該形狀被反射於正反射角度(-80°)。 Each of the diffusion films fabricated in the above examples and comparative examples was bonded to a black acrylic plate. Next, the three-wavelength floor lamp was placed in a direction inclined to 80° of the normal to the surface of the diffusion film. Next, check the sharpness of the shape of the floor lamp, which is reflected at the regular reflection angle (-80°).

[評估] [assessment]

擴散性◎：落地燈的輪廓被扭曲，因此光的位置是不可確認的。 Diffusion ◎: The outline of the floor lamp is distorted, so the position of the light is unconfirmable.

擴散性○：落地燈的輪廓被扭曲，但光源的位置是可確認的。 Diffusion ○: The outline of the floor lamp is distorted, but the position of the light source is identifiable.

擴散性X：落地燈的輪廓是清晰可辨。 Diffusion X: The outline of the floor lamp is clearly legible.

如上所述，依照本發明的擴散膜能解決由於外部光的反射而造成的圖像劣化，從而當顯示裝置具有優良的擴散性時，儘管有強烈的外部光，能確保足夠的可視性；並進一步由滿足介於75~95範圍內的反射率參數(X)，具有從顯示裝置各方向優良的可視性，如同從其前側一般。 As described above, the diffusion film according to the present invention can solve image deterioration due to reflection of external light, so that when the display device has excellent diffusibility, sufficient visibility can be ensured despite strong external light; Further, by satisfying the reflectance parameter (X) in the range of 75 to 95, it has excellent visibility from all directions of the display device as it is from the front side.

Claims (6)

一種具有75~95反射率參數(X)之擴散膜，該反射率參數(X)由方程式1所定義：[方程式1]反射率參數(X)=(A/B)X 100其中A為使用積分球，當光線入射到擴散膜的表面時，由量測除了反射自擴散膜表面法線8°方向外各方向反射的光線之反射率(%)而獲得的數值，B為使用積分球，當光線入射到擴散膜的表面時，由量測各方向反射的光線之反射率(%)而獲得的數值。 A diffusion film having a reflectance parameter (X) of 75 to 95, the reflectance parameter (X) being defined by Equation 1: [Equation 1] reflectance parameter (X) = (A/B) X 100 where A is used The integrating sphere, when the light is incident on the surface of the diffusing film, measures the value obtained by reflecting the reflectance (%) of the light reflected in each direction from the normal direction of the surface of the diffusing film by 8°, and B is an integrating sphere. A value obtained by measuring the reflectance (%) of light reflected in each direction when light is incident on the surface of the diffusion film. 如申請專利範圍第1項所述之擴散膜，其中該反射率參數(X)為80~90。 The diffusion film of claim 1, wherein the reflectance parameter (X) is 80 to 90. 如申請專利範圍第1項所述之擴散膜，其中該擴散膜包括一擴散層，在相對於100重量百分比之擴散層總組成中，該擴散膜包含15~80重量百分比的一透光樹脂，及3~30重量百分比的透光顆粒。 The diffusion film of claim 1, wherein the diffusion film comprises a diffusion layer comprising 15 to 80% by weight of a light transmissive resin in a total composition of 100% by weight of the diffusion layer. And 3 to 30% by weight of light-transmitting particles. 如申請專利範圍第3項所述之擴散膜，其中該透光顆粒的平均粒徑為1~10μm。 The diffusion film of claim 3, wherein the light-transmitting particles have an average particle diameter of 1 to 10 μm. 如申請專利範圍第3項所述之擴散膜，其中該擴散層的厚度為1~20μm。 The diffusion film of claim 3, wherein the diffusion layer has a thickness of 1 to 20 μm. 一種偏光板，包含如申請專利範圍第1至第5項任一項所述之擴散膜。 A polarizing plate comprising the diffusion film according to any one of claims 1 to 5.
TW102148099A 2012-12-26 2013-12-25 Diffusion film and polarizing plate using the same TW201428354A (en)

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JP3383260B2 (en) * 1999-04-26 2003-03-04 日東電工株式会社 Neutral polarizing plate and liquid crystal display
JP2001281406A (en) * 2000-03-28 2001-10-10 Fuji Photo Film Co Ltd Glare proof antireflection film, polarizing plate and liquid crystal display
JP2004061853A (en) * 2002-07-29 2004-02-26 Nitto Denko Corp Antidazzle film and display device using the same
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KR101088329B1 (en) * 2003-01-16 2011-11-30 스미또모 가가꾸 가부시끼가이샤 Antiglare film, method for manufacturing thereof, and display device having antiglare film
CN100476455C (en) * 2004-12-22 2009-04-08 日东电工株式会社 Hard-coated antiglare film and method of manufacturing the same
JP5252811B2 (en) * 2006-05-16 2013-07-31 日東電工株式会社 Anti-glare hard coat film, polarizing plate and image display device
JP2008216539A (en) * 2007-03-02 2008-09-18 Toppan Printing Co Ltd Antiglare film
WO2009041321A1 (en) * 2007-09-26 2009-04-02 Konica Minolta Opto, Inc. Optical film, polarization plate and image display device
JP2009156938A (en) * 2007-12-25 2009-07-16 Sumitomo Chemical Co Ltd Antiglare film, antiglare polarizing plate and image display device
KR101771104B1 (en) * 2011-05-27 2017-08-24 동우 화인켐 주식회사 Anti-Glare Film, Polarizing Plate and Display Device Including the Film

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KR101959475B1 (en) 2019-03-18

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