TWI345081B - Light diffusion sheet for a display device - Google Patents

Light diffusion sheet for a display device Download PDF

Info

Publication number
TWI345081B
TWI345081B TW096123144A TW96123144A TWI345081B TW I345081 B TWI345081 B TW I345081B TW 096123144 A TW096123144 A TW 096123144A TW 96123144 A TW96123144 A TW 96123144A TW I345081 B TWI345081 B TW I345081B
Authority
TW
Taiwan
Prior art keywords
light
light diffusing
ppwb
agent
coating
Prior art date
Application number
TW096123144A
Other languages
Chinese (zh)
Other versions
TW200804872A (en
Inventor
Young Oh
Chang Hee Cho
Seung Man Choi
Original Assignee
Cheil Ind Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cheil Ind Inc filed Critical Cheil Ind Inc
Publication of TW200804872A publication Critical patent/TW200804872A/en
Application granted granted Critical
Publication of TWI345081B publication Critical patent/TWI345081B/en

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface

Description

File:TW3873F 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種用於顯示裝置之光擴散片（light diffusion sheet)，且特別是有關於一種液晶顯示器之光擴 政片’其3b狗改善光抵抗性、發光效率及光擴散率。 【先前技術】 一般而& ’液晶顯示器（LCD)是屬於平面顯示器的一 種。其利用外加電場至兩個基板中的液晶，並藉以控制電 場強度’來控制外部光源穿透基板之穿透光的數量，以顯 示影像。而此外部光源即為背光單元（backlight unit， BLU)。於是乎，傳統的液晶顯示器具有一個背光單元設置 於其後表面上。 現今傳統的背光單元不是側光式的背光單元，就是直 下式的背光單元。其中’侧光式背光單元是使用於薄螢幕 的背光單元’例如筆記型或桌上型電腦的螢幕。直下式背 光單元是使用於大尺寸的裝置，例如液晶電視(LCD TV)。 傳統的直下式背光單元包括一個光源，此光源是用於發射 垂直光線至液晶顯示器的面板，並穿透至少一個反射片及 一個光擴散片。而光擴散片是用於散射光源所發射出的光 線，使光線能均勻地分散並遍佈至液晶顯示器的面板。傳 統的光擴散片包括光擴散劑（light diffuser)及透明的熱塑 性薄膜基層，而光擴散劑是位在薄膜基層上，其中薄膜基 層例如是甲基丙烯酸(methacrylic)、苯乙婦(styrene)、環烯 1345081File: TW3873F IX. Description of the Invention: [Technical Field] The present invention relates to a light diffusion sheet for a display device, and more particularly to a light expansion sheet for a liquid crystal display 3b dogs improve light resistance, luminous efficiency and light diffusivity. [Prior Art] A general & liquid crystal display (LCD) is one type of flat panel display. It utilizes an applied electric field to the liquid crystals in the two substrates and controls the intensity of the electric field to control the amount of light transmitted by the external light source through the substrate to display the image. The external light source is a backlight unit (BLU). Thus, a conventional liquid crystal display has a backlight unit disposed on a rear surface thereof. The conventional backlight unit is not an edge-lit backlight unit, and is a direct-lit backlight unit. Among them, the 'sidelight type backlight unit is a backlight unit used for a thin screen, such as a screen of a notebook type or a desktop type computer. The direct type backlight unit is used for a large-sized device such as a liquid crystal television (LCD TV). A conventional direct type backlight unit includes a light source for emitting vertical light to a panel of a liquid crystal display, and penetrating at least one of the reflection sheets and one of the light diffusion sheets. The light diffusing sheet is used to scatter the light emitted from the light source so that the light can be uniformly dispersed and spread over the panel of the liquid crystal display. The conventional light diffusing sheet comprises a light diffuser and a transparent thermoplastic film base layer, and the light diffusing agent is located on the film base layer, wherein the film base layer is, for example, methacrylic, styrene, Cycloolefin 1345081

File:TW3873F 烴(cycloolefin)或聚碳酸醋（P〇ly carb〇nate)等樹脂。 然而，對於背光單元而言，例如在使用於大尺寸的液 . 晶電視時，可以藉由增加光源所發射出的光線，以提供充 足的亮度。但是光線的量增加’會使背光單元所產生的熱 源大大地提升，導致光擴散片扭曲變形。特別是由傳統基 底樹脂所形成傳統光擴散片的透明薄膜基底層，例如是甲 基丙烯酸及苯乙烯樹脂所形成的透明薄膜基底層，其會因 為背光單元的光源所產生過高的熱源而變形。於是乎，在 籲 產業界中’的確是須要一個能抵抗高熱源的光擴散片，且 此光擴散片亦須具備足夠的光學性質及成形性。 【發明内容】 有鑑於此，本發明係提出一種光擴散片，以充分地克 服前述技術上的缺點。 於本發明之實施例的特徵，係提出一種用於顯示裝置 _ 之光擴散片，且此光擴散片具有較強的光抵抗性。 根據本發明之一方面’為了能讓本發明之前述或其它 特徵與優點容易理解，於此提出一種用於顯示裝置之光擴 散片。此光擴散片包括一基底層及至少一塗佈層。 基底層包括-基底楨f脂及一第一光擴散劑，基底樹脂 係一甲基丙烯酸酯-笨乙婦共聚物與一甲基丙烯酸甲酯_苯 乙烯共聚物之混合物’第一光擴散劑之含量為 0.2ppwb-20ppwb 〇 塗佈層位於基底層上方，塗佈層包括一塗佈基底樹 7 1345081,File: TW3873F a resin such as a cycloolefin or a polycarbonate (P〇ly carb〇nate). However, for a backlight unit, for example, when used in a large-sized liquid crystal television, it is possible to provide sufficient brightness by increasing the light emitted from the light source. However, the increase in the amount of light causes the heat source generated by the backlight unit to be greatly increased, resulting in distortion of the light diffusing sheet. In particular, a transparent film base layer of a conventional light diffusing sheet formed of a conventional base resin, for example, a transparent film base layer formed of methacrylic acid and styrene resin, which is deformed by an excessive heat source generated by a light source of the backlight unit . Therefore, in the industry, it is indeed necessary to have a light diffusing film that can resist high heat sources, and the light diffusing film must also have sufficient optical properties and formability. SUMMARY OF THE INVENTION In view of the above, the present invention provides a light diffusing sheet to sufficiently overcome the aforementioned technical disadvantages. In a feature of an embodiment of the present invention, a light diffusing sheet for a display device is proposed, and the light diffusing sheet has strong light resistance. In accordance with an aspect of the present invention, in order to make the foregoing or other features and advantages of the present invention easier to understand, an optical diffuser for a display device is proposed. The light diffusing sheet comprises a base layer and at least one coating layer. The base layer comprises a substrate 桢f grease and a first light diffusing agent, and the base resin is a mixture of a methacrylate-stupid copolymer and a methyl methacrylate-styrene copolymer. The content of the coating layer is 0.2 ppwb-20 ppwb. The coating layer is located above the substrate layer, and the coating layer comprises a coated substrate tree 7 1345081.

File:TW3873F 脂、一第二光擴散劑、一紫外光吸收劑及一抗靜電劑，塗 佈基底樹脂係一曱基丙烯酸曱酯-苯乙烯共聚物，第二光擴 散劑之含量為0.1ppwb-30ppwb，紫外光吸收劑之含量為 0.01ppwb-2ppwb，抗靜電劑之含量為 O.OOlppwb-lOppwb。 基底層之厚度為100#m-10000/zm，塗佈層之厚度為1〇 // m-1000 /z m。File: TW3873F grease, a second light diffusing agent, an ultraviolet light absorber and an antistatic agent, coated with a base resin, a fluorenyl acrylate-styrene copolymer, and a second light diffusing agent having a content of 0.1 ppwb -30 ppwb, the content of the ultraviolet light absorber is 0.01 ppwb - 2 ppwb, and the content of the antistatic agent is 0.01 ppwb - 10 Oppwb. The thickness of the base layer is 100#m-10000/zm, and the thickness of the coating layer is 1〇 // m-1000 /z m.

基底層之曱基丙烯酸酯·苯乙烯共聚物包括一重量百 分比為2%-20%之甲基丙稀酸醋單體及一重量百分比為 80%-98%之苯乙烯單體。 基底層之甲基丙烯酸甲酯-苯乙烯共聚物包括一重量 百分比為6%-94%之甲基丙烯酸甲酯單體及一重量百分比 為6%-94%之苯乙烯單體。 基底層之第一光擴散劑包括一含量為 O.lppwb-lOppwb之矽氧烷（sil〇xane)組成及一含量為 (Uppwb-lOppwb之丙烯酸酉旨（acrylic)組成，其中石夕氧烧組 成之平均直徑A l/zn^G/zm’丙烯酸餘成之平均直徑 為 1 y m-20 /z m。 塗佈層之第二光擴散劑包括—平均直徑為i//m〜5〇 //之丙婦酸酯組成、一平均直僻炎 J且4為lem〜2()//rn之矽氧烷 組成或丙烯酸醋組成與矽氧烷組成之組合。 矽氧烷組成，係包赵 ^ .· 括一聚二甲基矽氧烷 (polydimethylsiloxane) 、 一 ^ 聚二乙基矽氧烷 (polydiethylsiloxane)及一且古 _ " ，、有二維網狀結構之矽氧樹脂 (silicone resin)之其中之一或多個之組合。 8 1345081The thiol acrylate-styrene copolymer of the base layer comprises a methacrylic acid acrylate monomer in an amount of from 2% to 20% by weight and a styrene monomer in an amount of from 80% to 98% by weight. The methyl methacrylate-styrene copolymer of the base layer comprises from 6% to 94% by weight of methyl methacrylate monomer and from 6% to 94% by weight of styrene monomer. The first light diffusing agent of the base layer comprises a siloxane composition having a content of 0.1 ppwb-lOppwb and an acrylic composition having a content of (Uppwb-lOppwb), wherein the composition is composed of a sulphuric acid The average diameter of the average diameter A l / zn ^ G / zm 'acrylic acid is 1 y m-20 / zm. The second light diffusing agent of the coating layer includes - the average diameter is i / / m ~ 5 〇 / / The composition of the proacetin ester, an average singularity J and 4 is a combination of a decane composition of lem~2()//rn or a composition of an acrylic vinegar and a oxoxane. .. including polydimethylsiloxane, polydiethylsiloxane, and _ ", a two-dimensional network of silicone resin One or more of them. 8 1345081

File:TW3873F 丙稀酸醋組成，係為一甲基丙烯酸甲g旨（methyl methacrylate)、一曱基丙稀酸乙酉旨（ethyl methacrylate)、一 曱基丙烯酸丁酯（butyl methacrylate)、一曱基丙稀酸環已酯 (cyclohexyl methacrylate)、一曱基丙稀酸苯醋（phenyl methacrylate)、 一甲基丙烯酸苯甲酯（benzyl methacrylate)、一 丙稀酸曱酉旨（methyl acrylate)、一 丙烯酸 乙酯（ethyl acrylate)、一丙烯酸丁醋（butyl acrylate)、一丙 稀酸環已酯（cyclohexyl acrylate)、一丙婦酸苯酯（phenyl acrylate)、及一丙烯酸苯曱酉旨（benzyl acrylate)之其中之一 或多個之組合。 塗佈層之紫外光吸收劑用以吸收波長為 250nm-280nm之紫外光輻射。紫外光吸收劑係為一二苯酮 (benzophenone)、一苯基三峻（benzotriazole)、一氰基丙烯 酸酉旨（cyanoacrylate)、及一鎳基錯合鹽（nickel complex salt) 之其中之一或多個之組合。 塗佈層之抗靜電劑係為一聚醚硫亞氨基化合物 (polyether imide amide)、一聚醚醋（polyether ester)、一聚 醚醋氨基化合物(polyether ester amide)、一聚亞烧基二醇 (polyalkylene glycol)、一十二烷苯硫磺酸鹼金屬（alkali metal dodecylbenzene sulfonate)、一叔胺化合物（tertiary amine)、一季錄化合物（quaternary ammonium)、一 氣化納 (sodium chloride)、及一烧基胺化合物（alkyl amine)之其中 之一或多個之組合。 塗佈層更包括發泡劑（blowing agents)、塑化劑 9 1345081File: TW3873F Acrylic vinegar composition, which is methyl methacrylate, ethyl methacrylate, butyl methacrylate, fluorenyl methacrylate Cyclomethyl methacrylate, phenyl methacrylate, benzyl methacrylate, methyl acrylate, monoacrylic acid Ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, and benzyl acrylate One or more of them. The coating layer of the ultraviolet light absorber is used to absorb ultraviolet light having a wavelength of from 250 nm to 280 nm. The ultraviolet light absorber is one of benzophenone, benzotriazole, cyanoacrylate, and a nickel complex salt or A combination of multiples. The antistatic agent of the coating layer is a polyether imide amide, a polyether ester, a polyether ester amide, a polyalkylene glycol. (polyalkylene glycol), alkali metal dodecylbenzene sulfonate, a tertiary amine, a quaternary ammonium, a sodium chloride, and a calcining group A combination of one or more of the alkyl amines. The coating layer further includes blowing agents and plasticizers 9 1345081

File:TW3873F (plasticizers)、抗氧化劑（antioxidants)、熱安定劑（thermal stabilizers)、潤滑劑（lubricants)、防燃劑（flame retardants)、 填充劑（fillers)、鬆他劑（release agents)、色料(dyes)、染料 (pigments)、抗分離劑（anti-dropping agents)、成核劑 (nucleating agents)、光穩定劑（light stabilizers)或前述之組 塗佈層包括一浮凸圖案，浮凸圖案係為無定形 (amorphous)之浮凸圖案，且浮凸圖案之表面粗链度為〇,1 /zm-20#m。塗佈層更包括一光穩定劑。光擴散片更包括 兩個塗佈層，基底層係夾在兩個塗佈層中間。 根據本發明之另一方面，亦為了能讓本發明之前述或 其它特徵與優點容易理解，於此提出一種背光單元。此背 光單元包括一光源、至少一反射片及一光擴散片。 光擴散片包括一基底層及至少一塗佈層，基底層包括 一基底樹脂及一第一光擴散劑，基底樹脂係一曱基丙烯酸 酯-苯乙烯共聚物與一甲基丙烯酸甲酯-苯乙烯共聚物之混 合物’第一光擴散劑之含董為0.2ppwb-20ppwb，塗佈層位 於基底層上方’塗佈層包括一塗佈基底樹脂、一第二光擴 散劑、一紫外光吸收劑及一抗靜電劑，塗佈基底樹脂係一 甲基丙烯酸甲酯-苯乙烯共聚物，第二光擴散劑之含量為 0.1ppwb-30ppwb ，紫外光吸收劑之含量為 0.01Ppwb-2PPwb，抗靜電劑之含量為 〇 〇〇lppwb_1〇ppwb。 根據本發明之再一方面，更為了能讓本發明之前述或 其它特徵與優點容易理解’於此提出一種顯示裝置。此顯 1345081File: TW3873F (plasticizers), antioxidants, thermal stabilizers, lubricants, flame retardants, fillers, release agents, color Dyes, pigments, anti-dropping agents, nucleating agents, light stabilizers or a set of coating layers comprising a relief pattern, embossing The pattern is an amorphous embossed pattern, and the surface of the embossed pattern has a thick chain of 〇, 1 /zm-20#m. The coating layer further includes a light stabilizer. The light diffusion sheet further includes two coating layers sandwiched between the two coating layers. In accordance with another aspect of the present invention, and in order to facilitate the understanding of the foregoing or other features and advantages of the present invention, a backlight unit is proposed. The backlight unit includes a light source, at least one reflective sheet, and a light diffusing sheet. The light diffusion sheet comprises a base layer comprising a base resin and a first light diffusing agent, and the base resin is a thiol acrylate-styrene copolymer and a methyl methacrylate-benzene. Mixture of ethylene copolymer 'The first light diffusing agent contains 0.2ppwb-20ppwb, and the coating layer is above the base layer'. The coating layer comprises a coated base resin, a second light diffusing agent and an ultraviolet light absorber. And an antistatic agent, the base resin is coated with a methyl methacrylate-styrene copolymer, the second light diffusing agent is 0.1 ppwb-30 ppwb, and the ultraviolet light absorbing agent is 0.01 Ppwb-2PPwb, antistatic The content of the agent is 〇〇〇lppwb_1〇ppwb. According to still another aspect of the present invention, the foregoing or other features and advantages of the present invention are more readily understood. A display device is proposed herein. This display 1345081

File:TW3873F 示裝置包括一顯示面板及一背光單元。 背光單元包括一光源及一光擴散片，光擴散片包括一 基底層及至少一塗佈層，基底層包括一基底樹脂及一第一 光擴散劑，基底樹脂係一甲基丙烯酸酯-苯乙烯共聚物與一 甲基丙烯酸甲酯-苯乙烯共聚物之混合物，第一光擴散劑之 含量為0.2ppwb-20ppwb，塗佈層位於基底層上，塗佈層包 括一塗佈基底樹脂、一第二光擴散劑、一紫外光吸收劑及 一抗靜電劑，塗佈基底樹脂係一曱基丙烯酸曱酯-苯乙烯共 聚物，第二光擴散劑之含量為〇.lppwb-30ppwb，紫外光吸 收劑之含量為0.01ppwb-2ppwb，抗靜電劑之含量為 O.OOlppwb〜lOppwb。其中，顯示裝置係一液晶顯示器。 為讓本發明之上述内容能更明顯易懂，下文特舉一較 佳實施例，並配合所附圖式，作詳細說明如下： 【實施方式】 分別提交於2006年7月7日和2006年12月5曰之 韓國專利申請第10-2006-0064065號和第10-2006-0122521 號，其專利名稱為「應用於液晶顯示器之背光單元之光擴 散片（Light Diffusion Sheet for LCD Back Light Unit)」之全 部内容係引用併入本文。 在下文中將搭配附圖詳盡地說明本發明，而附圖係本 發明之一較佳實施例的舉例說明。然而，本發明係可藉許 多實質相同的形態而實施，於此不應以實施態樣來限定本 發明。相反地，本發明以較佳的實施例完整且詳盡地揭露 11 1345081File: The TW3873F display device includes a display panel and a backlight unit. The backlight unit comprises a light source and a light diffusion sheet. The light diffusion sheet comprises a base layer and at least one coating layer. The base layer comprises a base resin and a first light diffusing agent, and the base resin is a methacrylate-styrene. a mixture of a copolymer and a methyl methacrylate-styrene copolymer, the content of the first light diffusing agent is 0.2 ppwb-20 ppwb, the coating layer is on the base layer, and the coating layer comprises a coating base resin, a first a light diffusing agent, an ultraviolet light absorber and an antistatic agent, coated with a base resin, a fluorenyl acrylate-styrene copolymer, and a second light diffusing agent having a content of 〇.lppwb-30ppwb, ultraviolet light absorption The content of the agent is 0.01 ppwb to 2 ppwb, and the content of the antistatic agent is 0.01 ppwb to 10 ppwb. Wherein, the display device is a liquid crystal display. In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below in conjunction with the accompanying drawings, and the following detailed description is given as follows: [Embodiment] Submitted on July 7, 2006 and 2006, respectively. Korean Patent Application No. 10-2006-0064065 and No. 10-2006-0122521 of December 5, the patent name of which is "Light Diffusion Sheet for LCD Back Light Unit" The entire contents of this application are incorporated herein by reference. The invention will be described in detail below with reference to the accompanying drawings, which are illustrated by the preferred embodiment of the invention. However, the present invention may be embodied in many different forms and the invention is not limited by the embodiments. Rather, the invention is fully and exhaustively disclosed in the preferred embodiment. 11 1345081

File:TW3873F 於下文中，係藉以完整地傳達本發明之技術領域予熟悉此 技藝者。 . 為了能清楚表達圖式，故於附圖中係擴大層板與區域 的尺寸。且於文中，當提到層板或元件是在另一層板或基 材之”上”時，是指此層板或元件是直接在另一層板或另一 基材”正上方”，亦或存在有其它中間層。另外，當提到層 板或元件是在另一層板或另一基材之”下方”時，是指此層 板或元件是直接在另一層板或另一基材”正下方”，亦或存 • 在有一個或多個中間層。再者，當提到層板是在兩個層板 之”中間”時，是指此層板是直接在兩個層板之”中間”，亦 或存在一個或多個中間層。並且，在文中相同之元件係使 用相同之標號。 請參照第1圖及第2圖，其繪示依照本發明之一較佳 實施例之光擴散片，其中光擴散片應用於一顯示裝置，顯 示裝置例如是一液晶顯示器。以下將對第1圖及第2圖作 更詳盡地說明。 ® 如第1圖所示之一光擴散片20包括一基底層200及 至少一塗佈層210，塗佈層210係位於基底層200上方。 當光擴散片20應用於一顯示裝置（未繪示）時，光擴 散片20之基底層200係作為光擴散片20的支撐基底。而 基底層200的厚度可約為100至10000/zm，即沿y轴度 量之距離。基底層200包括一約為100重量成份之基底樹 脂及一約為0.2-20重量成份之光擴散劑，且光擴散劑之平 均直徑約為1 # m-20 # m。就此而言，須注意，重量成份 12File: TW3873F In the following, the technical field of the present invention is fully conveyed to those skilled in the art. In order to clearly express the drawings, the dimensions of the laminates and regions are enlarged in the drawings. In the text, when a layer or element is referred to as being "on" another layer or substrate, it is meant that the layer or element is directly over the other layer or another substrate, or There are other intermediate layers. In addition, when a layer or element is referred to as being "under" another layer or another substrate, it is meant that the layer or element is directly beneath the other layer or another substrate, or Save • There are one or more intermediate layers. Furthermore, when it is mentioned that the laminate is "in the middle" of the two laminates, it means that the laminate is directly in the "middle" of the two laminates, or one or more intermediate layers are present. Also, the same elements are used in the same reference numerals. Referring to Figures 1 and 2, there is shown a light diffusing sheet according to a preferred embodiment of the present invention, wherein the light diffusing sheet is applied to a display device such as a liquid crystal display. The first and second figures will be described in more detail below. The light diffusing sheet 20 as shown in Fig. 1 comprises a base layer 200 and at least one coating layer 210, and the coating layer 210 is located above the base layer 200. When the light diffusing sheet 20 is applied to a display device (not shown), the base layer 200 of the light diffusing sheet 20 serves as a supporting substrate of the light diffusing sheet 20. The thickness of the base layer 200 can be about 100 to 10000/zm, i.e., the distance along the y-axis. The base layer 200 comprises a base resin of about 100 parts by weight and a light diffusing agent of about 0.2-20 parts by weight, and the light diffusing agent has an average diameter of about 1 # m-20 #m. In this regard, it should be noted that the weight component 12

File:TW3873F 是以基底層200之基底樹脂的重量為基準，或是以塗佈層 210之塗佈基底樹脂的重量為基準。即，以重量計算在1〇〇 重量成份之基底樹脂中所佔之重量成份，或稱 為 ”ppwb”(parts by weight per 100 parts by weight of the base resin)。更具體來說，對於基底層200之重量成份而 言’ ’’ppwb”係以基底層200之基底樹脂為基準。對於塗佈 層210之重量成份而言，’’ppwb”係以塗佈層210之塗佈基 底樹脂為基準。以下將對此作更詳盡地說明。 更進一步地說’基底層200包括一基底樹脂，基底樹 脂係一甲基丙烯酸醋-苯乙稀(methacrylate styrene，MS)共 聚物與一曱基丙烯酸甲醋-苯乙烯（methylmethacrylate styrene，MMS)共聚物之混合物。MS及MMS係藉由適當 的技術進行混合，例如乳液聚合法（emulsion polymerization)、懸浮聚合法（suspension polymerization)、 溶液聚合法（solution polymerization)、塊狀聚合法（bulk polymerization)，及其它技術。 MS共聚物係包括一重量百分比為2%-20%之甲基丙 烯酸酯單體及一重量百分比為80%-98%之苯乙烯單體。而 較佳地情況下，MS共聚物係包括一重量百分比為5%-10% 之甲基丙烯酸酯單體及一重量百分比為90%-95%之苯乙 烯單體。其係以聚苯乙烯為基礎，ΜΑ-ST共聚物之平均分 子量約為200,000〜350,000。 MMS共聚物係包括一重量百分比為6%-94%之甲基 丙烯酸酯單體及一重量百分比為6%-94%之苯乙烯單體。 134,5081File: TW3873F is based on the weight of the base resin of the base layer 200 or based on the weight of the coated base resin of the coating layer 210. Namely, the weight component in the base resin of 1 Å by weight, or "parts by weight per 100 parts by weight of the base resin". More specifically, for the weight component of the base layer 200, ''ppwb'' is based on the base resin of the base layer 200. For the weight component of the coating layer 210, ''ppwb'' is a coating layer. The coated base resin of 210 is used as a reference. This will be explained in more detail below. Furthermore, the base layer 200 comprises a base resin, a base resin, a methacrylate styrene (MS) copolymer and a methylmethacrylate styrene (MMS) copolymer. a mixture of things. MS and MMS are mixed by a suitable technique such as emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization, and the like. The MS copolymer comprises from 1% to 20% by weight of the methacrylate monomer and from 80% to 98% by weight of the styrene monomer. Preferably, the MS copolymer comprises from 5% to 10% by weight of methacrylate monomer and from 90% to 95% by weight of styrene monomer. It is based on polystyrene and the average molecular weight of the ruthenium-ST copolymer is about 200,000 to 350,000. The MMS copolymer comprises from 6% to 94% by weight of the methacrylate monomer and from 6% to 94% by weight of the styrene monomer. 134,5081

File:TW3873F 而較佳地情況下’ MMS共聚物係包括一 曰 白··、 、 20%-80%之曱基丙烯酸酯單體及一重量二比為 20%-80%之笨乙烯單體。其係以聚苯乙烯為基^刀，= 共聚物之平均分子量約為7〇,〇〇〇〜3〇〇,〇〇〇。 基底廣200之光擴散劑包括多個有機教子 機粒子。有機粒子例如是魏院、氟化聚合 ；File: TW3873F and preferably the 'MMS copolymer system comprises a ruthenium, ·, 20%-80% mercapto acrylate monomer and a weight ratio of 20% to 80% of stupid ethylene monomer . It is based on polystyrene, and the average molecular weight of the copolymer is about 7 〇, 〇〇〇~3〇〇, 〇〇〇. The light diffusing agent of the base 200 comprises a plurality of organic teacher particles. The organic particles are, for example, Weiyuan, fluorinated polymerization;

(撼〇_)、丙稀酸酉旨及/或苯乙稀。無機教子例如是碳^ 鮮、硫酸鋇、二氧化鈦、氫氧化銘、二氧化石夕、玻璃、滑 石、雲母、白炭卜_娜。11)、氧化鎂及/或氧化鋅。有: 粒子或無機粒子係散佈於基底樹脂之混合物中，其與基底 樹脂之混合物的折射率相差約為〇 〇2_〇 13。 /、土一 在本實施例中，光擴散劑包括一含量為 O.lppwb-lOppwb之矽氧烷組成及—含量為 〇.lPPwb-10Ppwv之丙烯酸酯組成。其中矽氣烷組=之$平均 直徑為l/zm-20/zm’丙稀酸醋組成之平均直徑為 。以矽氧烷組成舉例來說，矽氧烷組成可以是一具有 球狀交聯粒子之交聯魏炫樹脂。交聯錢燒樹脂係/包括 於至/BZL下為固悲之吩氧樹脂（Sjlic〇ne代如）、一聚二烧美 矽氧烷樹脂(P〇lydialkylsil〇xane resin) ' 一具有三維網路結 構之石夕氧樹脂’及其它材料。於室溫下為固態之梦氧樹脂 例如是一具有低交聯度高流動性之矽氧橡膠（silicone =bber)及-具有高交聯度高硬度之♦氧樹腊。聚二烧基石夕 虱烷樹脂例如是一聚二甲基矽氧烷(p〇lydimethylsil〇xane) 及聚二乙基矽氧烷(p〇lydiethy lsil〇xane)。具有三維網路結 1345081(撼〇_), acrylic acid and/or styrene. Inorganic teachants are, for example, carbon dioxide, barium sulfate, titanium dioxide, hydroxide, quartz dioxide, glass, talc, mica, and white carbon. 11), magnesium oxide and / or zinc oxide. There are: particles or inorganic particles dispersed in a mixture of base resins whose refractive index differs from that of the base resin by about 〇 〇 2 〇 13 . /, soil 1 In the present embodiment, the light diffusing agent comprises a composition of oxetane having a content of 0.1 ppwb-lOppwb and an acrylate composition having a content of 〇.lPPwb-10Ppwv. The average diameter of the composition of the helium group = l/zm-20/zm' of acrylic acid vinegar is . By way of example, the rhodium hydride composition may be a crosslinked Weixuan resin having spherical crosslinked particles. Cross-linked money-burning resin system / included in the /BZL is the singular oxy-resin (Sjlic〇ne generation), a poly-pyro-alkylene oxide resin (P〇lydialkylsil〇xane resin) Road structure of stone oxide resin' and other materials. The epoxy resin which is solid at room temperature is, for example, a silicone rubber having a low degree of crosslinking and a high fluidity (silicone = bber) and an oxygen wax having a high degree of crosslinking and high hardness. The polydialkyl decane resin is, for example, p-polydimethylsilxane and p〇lydiethy lsil〇xane. With three-dimensional network junction 1345081

File:TW3873F 構之矽氧樹脂例如是一含環氧端基矽氧烷（ep〇xy terminated moiety-containing siioxane)。在不超出理論的範 • 疇，如使用交聯矽氧烷樹脂，將可給予光擴散劑較優異的 • 潤濕性，使光擴散劑能夠明顯地降低因光源長期照射所產 生之泛黃現象(yellowing)。 矽氧烷組成與其它有機交聯化合物相比，矽氧烷組成 具有較低的折射率。更清楚地說，矽氣烷組成之折射率約 為丨.40-1.43。因此，在不超出理論的範疇，與其它有機交 鲁聯樹脂相比之下，即使只使用少量的石夕氧烧組成，亦可給 予光擴散片20充足的光擴散率及光穿透率。 以丙烯酸酯組成舉例來說，基底層2〇〇之光擴散劑中 的丙烯酸酯組成包括一丙烯酸單官能基單體（比如丙烯酸 烷基酯）、一丙烯酸曱烷基酯、其它相似的單體及前述各個 丙烯酸酯組成之組合。丙烯酸烷基酯例如是丙烯酸乙酯、 丙稀酸f酯、丙婦酸丁酯、丙婦酸環已酯、丙嫦酸苯酯、 鲁 丙烯酸苯甲酯）。甲基丙烯酸烷基酯例如是甲基丙烯酸乙 酯、甲基丙烯酸甲酯、甲基丙烯酸丁酯、曱基丙烯酸環已 酯、曱基丙烯酸苯酯、甲基丙烯酸笨甲酯。並且，丙烯酸 酯組成可以是一球狀交聯粒子，且丙烯酸酯組成之折射率 約為1.46-1.56。就此而言，丙烯酸酯組成之折射率會因丙 烯酸甲酯及MS共聚物之含量而改變。即，若增加苯基群 或鹵素群的含量，會使丙烯酸酯組成之折射率增加。 光擴散片20之基底層200更包括一抗衝擊劑（impact resistance modifier)。抗衝擊劑用以強化基底層2〇〇之彈 15 1345081File: TW3873F is a epoxixy terminated moiety-containing siioxane. Without exceeding the theoretical scope, such as the use of cross-linked alkane resin, it will give the light diffusing agent excellent wettability, so that the light diffusing agent can significantly reduce the yellowing caused by long-term illumination of the light source. (yellowing). The decane composition has a lower refractive index than the other organic crosslinking compounds. More specifically, the refractive index of the helium alkane composition is about 40.40-1.43. Therefore, in the range not exceeding the theory, compared with other organic cross-linking resins, even if only a small amount of the composition is used, the light diffusing sheet 20 can be given sufficient light diffusivity and light transmittance. By exemplifying the acrylate composition, the acrylate composition in the light diffusing agent of the base layer 2 includes an acrylic monofunctional monomer (such as an alkyl acrylate), a decyl acrylate, and the like. And a combination of the foregoing respective acrylate compositions. The alkyl acrylate is, for example, ethyl acrylate, propyl acrylate, butyl acetoacetate, cyclohexyl propyl acrylate, phenyl propyl acrylate, benzyl urethane. The alkyl methacrylate is, for example, ethyl methacrylate, methyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, and methyl methacrylate. Further, the acrylate composition may be a spherical crosslinked particle, and the acrylate composition has a refractive index of about 1.46-1.56. In this regard, the refractive index of the acrylate composition varies depending on the content of the methyl acrylate and the MS copolymer. That is, if the content of the phenyl group or the halogen group is increased, the refractive index of the acrylate composition is increased. The base layer 200 of the light diffusing sheet 20 further includes an impact resistance modifier. Anti-impact agent to strengthen the base layer 2 〇〇 15 15 81

File:TW3873F 性，例如可供予基底層200高抗衝擊性及高撓性。抗衝擊 劑包括一彈性體，彈性體例如是丙烯酸酯橡膠、曱基丙烯 . 酸酯橡膠、聚丁酯橡膠，及其它。 如第1圖所示，光擴散片20之至少一個塗佈層210 係形成在基底層200上方，其厚度約為10/zm〜l，000/zm。 光擴散片20之塗佈層210包括一約為100重量成份之塗 佈基底樹脂、一含量約為0.1ppwb-30ppwb之光擴散劑、 一含量約為0.01ppwb-2ppwb之紫外光吸收劑（UV 鲁 absorber)、一含量約為〇.〇〇lppwb-10ppwb之抗靜電劑 (antistatic agent)。其中光擴散劑之平均直徑約為lym-50 βπι。塗佈層210之塗佈基底樹脂係不同於基底層200之 基底樹脂。其洋細地說，塗佈層210之塗佈基底樹脂包括 一 MMS共聚物。塗佈層210之塗佈基底樹脂之MMS共 聚物大致上係相似於基底層200之基底樹脂之MMS共聚 物，例如MMS共聚物係包括一重量百分比為6%-94%之 曱基丙婦酸酯單體及一重量百分比為ό%·94%之苯乙稀單 • 體。 塗佈層21 〇之光擴散劑包括一丙烯酸醋組成、一石夕氧 烷組成或丙烯酸酯組成與矽氧烷組成之組合。在本實施例 中，塗佈層210之光擴散劑之丙烯酸酯組成及/或矽氧烷組 成之組合大致上係相同於前述之基底層2〇〇之丙烯酸酯組 成及/或矽氧烷組成，因此不再贅述其詳細成份。然而塗佈 層210之丙稀酸醋組成之平均直徑係不同於基底層200之 丙婦酸自旨組成之平均直徑，但其折射率仍然相 同。在不超 16 1345081File: TW3873F, for example, can provide the base layer 200 with high impact resistance and high flexibility. The impactor comprises an elastomer such as acrylate rubber, mercapto propylene rubber rubber, polybutyl acrylate rubber, and others. As shown in Fig. 1, at least one coating layer 210 of the light diffusion sheet 20 is formed over the base layer 200 and has a thickness of about 10/zm to 1,000/zm. The coating layer 210 of the light diffusing sheet 20 comprises a coated base resin of about 100 parts by weight, a light diffusing agent having a content of about 0.1 ppwb to 30 ppwb, and an ultraviolet light absorbing agent (UV) having a content of about 0.01 ppwb to 2 ppwb. Lu absorber), an antistatic agent having a content of about 〇〇.〇〇lppwb-10ppwb. The average diameter of the light diffusing agent is about lym-50 βπι. The coating base resin of the coating layer 210 is different from the base resin of the base layer 200. Specifically, the coated base resin of the coating layer 210 comprises an MMS copolymer. The MMS copolymer of the coating base 210 coated with the base resin is substantially similar to the MMS copolymer of the base resin of the base layer 200, for example, the MMS copolymer system comprises a 6%-94% by weight of mercaptopropionic acid. The ester monomer and one part by weight are ό%·94% of styrene monomer. The light diffusing agent of the coating layer 21 comprises an acrylic vinegar composition, a monoxanthene composition or a combination of an acrylate composition and a decane composition. In this embodiment, the combination of the acrylate composition and/or the siloxane composition of the light diffusing agent of the coating layer 210 is substantially the same as the acrylate composition and/or the decane composition of the base layer 2 described above. Therefore, the detailed components thereof will not be described. However, the average diameter of the acrylic acid vinegar composition of the coating layer 210 is different from the average diameter of the acrylic acid composition of the base layer 200, but the refractive index remains the same. Not exceeding 16 1345081

File:TW3873F 出理論的範疇，塗佈層210之光擴散劑是可以控制塗佈層 210之表面之輝度及光澤度。例如以塗佈層21〇之一不規 • 則形狀表面而言，從加強其不規則形狀表面之外觀性質， . 可以使光穿透率及光擴散率縮小，或者防止光穿透率及光 擴散率降低。 塗佈層210之紫外光吸收劑可以屏蔽光源射出之紫 外光幅射，以保護光擴散片20。紫外光吸收劑可以是一能 夠吸收250nm-280nm波長光之任何材料。以紫外光吸收劑 鲁舉例來說，紫外光吸收劑可以是一二苯酮 (benzophenone)、一笨基三唾(benz〇triaz〇ie)、一氰基丙婦 酸醋（cyanoacrylate)、水揚酸自旨（salicylate)及一鎳基錯合鹽 (nickel complex salt)之其中之一或多個之組合。紫外光吸 收劑可以加入一光穩定劑（light stabilizer)以縮小其自由 基，藉以改善塗佈基底樹脂之整體的耐久性。光穩定劑是 一能夠縮小光擴散片20之任一組成落差之任何材料，例 鲁 如疋P早礙醇胺（hindered amine) 〇 塗佈層210之抗靜電劑可以減少塗佈層210内之空間 電荷。且特別是MMS共聚物具有相對較高且較明顯的電 阻，此即表示，在MMS共聚物之表面容易產生靜電，使 得灰塵聚積及吸附在MMS共聚物之表面。然此灰塵會降 低光擴散片20之表面性質，使光擴散片2〇之發光效率下 降’並且造成光污點（lamp discoloration)之情形。於是，塗 佈層210之抗靜電劑用於降低其表面之靜電，藉以減少其 表面上之大量的灰塵。抗靜電劑包括一聚醚硫亞氨基化合 17 1345081 *File: TW3873F In the theoretical scope, the light diffusing agent of the coating layer 210 can control the brightness and gloss of the surface of the coating layer 210. For example, in the case of one of the coating layers 21, the shape of the surface, from the surface properties of the surface of the irregular shape, the light transmittance and the light diffusivity can be reduced, or the light transmittance and light can be prevented. The diffusivity is reduced. The ultraviolet light absorber of the coating layer 210 shields the ultraviolet light emitted from the light source to protect the light diffusion sheet 20. The ultraviolet light absorber may be any material capable of absorbing light having a wavelength of from 250 nm to 280 nm. For example, the ultraviolet light absorber may be benzophenone, benz〇triaz〇ie, cyanoacrylate, shuiyang. A combination of one or more of salicylate and a nickel complex salt. The ultraviolet light absorber may be added with a light stabilizer to reduce its free radical, thereby improving the durability of the entire coated base resin. The light stabilizer is any material capable of reducing any composition drop of the light diffusion sheet 20. For example, the antistatic agent of the hindered amine coating layer 210 can reduce the amount of the antistatic agent in the coating layer 210. Space charge. In particular, the MMS copolymer has a relatively high and significant resistance, which means that static electricity is easily generated on the surface of the MMS copolymer, so that dust accumulates and adsorbs on the surface of the MMS copolymer. However, this dust lowers the surface properties of the light-diffusing sheet 20, causing the light-emitting efficiency of the light-diffusing sheet 2 to drop and cause a situation of lamp discoloration. Thus, the antistatic agent of the coating layer 210 serves to reduce the static electricity on the surface thereof, thereby reducing the amount of dust on the surface thereof. Antistatic agent includes a polyether thioimino compound 17 1345081 *

File:TW3873F 物、一聚醚酯、一聚醚酯氨基化合物、一聚亞炫基二醇、 二烧苯硫項酸驗金屬、一叔胺化合物、一季錄化合 • 物、一氯化鈉及一烧基胺化合物之其中之一或多個之組 合。 光擴散片20更包括一個或多個添加劑。添加劑包括 發泡劑、塑化劑、抗氧化劑、熱安定劑、潤滑劑、防燃劑、 填充劑、鬆弛劑、色料、染料、抗分離劑、成核劑或前述 各種添加劑之組合。舉例來說，在光擴散片20中使用發 鲁 泡劑，將可減少光擴散片20因樹脂裂解產生之泛黃現象。 塗佈層210具有至少一個不規則形狀表面。舉例來 说，塗佈層具有一無定形的浮凸圖案（emb〇ssing pattern) 211於其表面上’使得從光源到LCD面板之穿透光，可經 由光擴散片20而散射、擴散或集中。尤其，當光從塗佈 層210之無定形的浮凸圖案211之細孔穿透時，此穿透光 例如會往數個方向擴散，從而增強光擴散片20之光穿透 鲁 率及光擴散率，並且可改善LCD之整體發光性。塗佈層 210之無定形的浮凸圖案211的表面粗糖度為〇.1以m_2〇 ’即為塗佈層210之表面之多個不規則區的平均垂直 高度差。 塗佈層210之不規則形狀表面的形成，例如是藉由加 壓加工（press processing)、紫外光樹脂塗钸及加工（uv resin coating and processing)、拋光滾軋直接加工 (contacting process via a polishing roll)及其它方法。舉例 來說，拋光滚軋會在塗佈層210之表面形成多個不規則 18File: TW3873F, a polyether ester, a polyether ester amino compound, a poly-dishylene glycol, a bis- thiosulfanic acid metal test, a tertiary amine compound, a quarterly compound, sodium chloride and A combination of one or more of the monoalkylamine compounds. The light diffusing sheet 20 further includes one or more additives. The additives include a foaming agent, a plasticizer, an antioxidant, a heat stabilizer, a lubricant, a flame retardant, a filler, a relaxant, a colorant, a dye, an anti-separator, a nucleating agent, or a combination of the foregoing various additives. For example, the use of a foaming agent in the light diffusing sheet 20 can reduce the yellowing phenomenon of the light diffusing sheet 20 due to resin cracking. The coating layer 210 has at least one irregularly shaped surface. For example, the coating layer has an amorphous embssing pattern 211 on its surface such that the transmitted light from the light source to the LCD panel can be scattered, diffused or concentrated via the light diffusing sheet 20. . In particular, when light penetrates from the pores of the amorphous embossed pattern 211 of the coating layer 210, the transmitted light diffuses, for example, in several directions, thereby enhancing the light penetration rate and light of the light diffusion sheet 20. Diffusion rate, and can improve the overall luminosity of the LCD. The surface roughness of the amorphous embossed pattern 211 of the coating layer 210 is 〇.1 by m_2〇', which is the average vertical height difference of a plurality of irregularities of the surface of the coating layer 210. The formation of the irregularly shaped surface of the coating layer 210 is, for example, by press processing, uv resin coating and processing, and contact processing via a polishing. Roll) and other methods. For example, the polishing roll forms a plurality of irregularities on the surface of the coating layer 210.

File:TW3873F 區，從而使光源向LCD散發的均勻散射光（比如亮線式的 均勻散射光）變得暗淡朦朧。不規則形狀表面之形狀例如是 取決於光源之間的距離、光擴散片與光源之間的距離、光 源的亮度，以及其它條件。 由於塗佈層210是塗覆於基底層200，故塗佈層210 之無定形的浮凸圖案211是設置於異於基底層200之表 面。基底層200與塗佈層210是藉由適當的方法互相黏 結，例如射出成形（injection molding)、押出成形（extrusion molding)、真空成形（vacuum molding)、熱壓成形 (thermal-press molding)、共押成形（coextrusion molding)、 薄膜沈積（film deposition)、溶劑黏著（solvent adhesion)、 表面塗佈（surface coating)、疊合成形（lamination)及其它。 光擴散片20之組成是藉由熱塑成形技術進行混合， 例如射出成形、押出成形、真空成形、熱壓成形、共押成 形及相似的技術。以多層押出成形（multilayer-extrusion molding)舉例來說’是各自地將基底層200及塗佈層210 進行組成混合’並將各自的混合物放入一進料模（feed block die)或一多管模(multi-manifold die)中。再以拋光滚 軋形成多層疊板’此即為沿y軸堆疊成數個層板的結構， 例如可以形成一具有雙層疊板結構之光擴散片2〇。 根據本發明之另一實施例，一光擴散片21具有複數 個塗佈層210。光擴散片21除了具有複數個塗佈層210之 外，其餘係與光擴散片20相同。舉例來說，如第2圖所 示，塗佈層210是以疊層的方式黏貼於基底層2〇〇之上下 1345081File: The TW3873F area, which makes the uniform scattered light emitted by the light source to the LCD (such as bright-line uniform scattered light) dim. The shape of the irregular shaped surface is, for example, dependent on the distance between the light sources, the distance between the light diffusing sheet and the light source, the brightness of the light source, and other conditions. Since the coating layer 210 is applied to the base layer 200, the amorphous embossed pattern 211 of the coating layer 210 is disposed on a surface different from the base layer 200. The base layer 200 and the coating layer 210 are bonded to each other by an appropriate method, such as injection molding, extrusion molding, vacuum molding, thermal-press molding, and the like. Coextrusion molding, film deposition, solvent adhesion, surface coating, lamination, and others. The composition of the light diffusing sheet 20 is mixed by a thermoplastic forming technique such as injection molding, extrusion molding, vacuum forming, hot press forming, co-embossing, and the like. In the case of multilayer-extrusion molding, for example, 'the base layer 200 and the coating layer 210 are separately subjected to composition mixing' and the respective mixtures are placed in a feed block die or a multi-tube. In a multi-manifold die. Further, a multi-layered board is formed by polishing rolling. This is a structure in which a plurality of layers are stacked along the y-axis. For example, a light-diffusing sheet 2 having a double-layered plate structure can be formed. According to another embodiment of the present invention, a light diffusing sheet 21 has a plurality of coating layers 210. The light diffusion sheet 21 is the same as the light diffusion sheet 20 except that it has a plurality of coating layers 210. For example, as shown in Fig. 2, the coating layer 210 is laminated on the base layer 2 13 1345081

File:TW3873F 表面。換句話說’基底層200位於至少兩個塗佈層21〇中 間。此外，基底層200與塗佈層210之其它形態亦為本發 明領域之範圍。File: TW3873F surface. In other words, the base layer 200 is located in at least two of the coating layers 21〇. Further, other forms of the base layer 200 and the coating layer 210 are also within the scope of the present invention.

根據本發明之實施例’在基底層200中，MS與MMS 之基底樹脂混合物可以改善基底層200之熱抵抗性、光抵 抗性及光學性質。光擴散劑之球狀石夕氧烧組成及/或丙稀酸 酯組成可以給予基底層200優異的光擴散率及光穿透率。According to an embodiment of the present invention, in the base layer 200, the base resin mixture of MS and MMS can improve the heat resistance, light resistance, and optical properties of the base layer 200. The spherical ortho-oxygen composition and/or the acrylate composition of the light diffusing agent can impart excellent light diffusivity and light transmittance to the underlying layer 200.

另外，若是使用有機光擴散劑，而非使用傳統的無機光擴 散劑時，可以增加光分散之均勻性。並且，有機光擴散劑 之使用亦可降低生產設備之損耗及費用，以及減少吸附之 粒子。同樣地’根據本發明之實施例之塗佈層21〇之組成， 可以大大地降低光及/或熱長期照射所產生之泛黃 及大大地射_電而吸附之錢。抗靜㈣及光辑定劑 ，加至塗佈層2H) ’可以使生產成本降低。因此，若使用 =發明實施例之光擴散片於-顯示裝細如液晶顯示器） 夺’將可以改善其顯示特性，並同時可崎低生產成本。 拖眘Λ下將搭配—些實例讓本發明更容易理解。然而，此 〜貫例並非用以限定本發明之範圍。 實例： 實例1 : 基底層之製作： 酯- ::基丙烯酸醋-笨乙烯(MS)共聚物及甲 脂。添mrrr切成_ ®量絲之基底樹 ' 3里*，、、ppw之石夕氧樹月旨粒子及含量為 2ppwb 20 134.5081Further, if an organic light diffusing agent is used instead of a conventional inorganic light diffusing agent, the uniformity of light dispersion can be increased. Moreover, the use of organic light diffusing agents can also reduce the wear and tear of production equipment and reduce the adsorption of particles. Similarly, the composition of the coating layer 21 according to the embodiment of the present invention can greatly reduce the yellowing caused by long-term irradiation of light and/or heat and the amount of money adsorbed by electricity. Anti-static (4) and light-setting agents can be added to the coating layer 2H) to reduce production costs. Therefore, if the light diffusing film of the invention example is used, the display device can be improved in display characteristics, and at the same time, the production cost can be lowered. A careful understanding of the present invention will be made easier by the accompanying examples. However, this example is not intended to limit the scope of the invention. EXAMPLES Example 1: Fabrication of the base layer: Ester-::based acrylic vinegar-stupid ethylene (MS) copolymer and methyl ester. Add mrrr cut into _ ® basal tree of silk] '3 *,,, ppw stone oxime tree particles and content is 2ppwb 20 134.5081

File:TW3873F 之丙烯酸酯交聯粒子至基底樹脂，以構成基底層之成份。 其中’矽氧樹脂粒子之平均直徑為2/zm(購於GE Toshiba Silicone Co” Ltd.)。丙烯酸酯交聯粒子之平均直徑為8/z m(購於 Sekisui Chemical Co.，Ltd.)。 塗佈層之製作： 由甲基丙烯酸酯-苯乙烯(MS)共聚物形成100重量成 伤之塗佈基底樹脂。添加含量為1〇ppwb之丙烯酸酯交聯 粒子:含量為lppwb之抗靜電劑、含量為lppwb2光穩定 劑至塗佈基底樹脂，以構成塗饰層之成份。其中丙婦酸醋 父聯粒子之平均直徑為20/zm(購買於Sekisui chemical Co” Ltd.)。 多層光擴散片之製作： 各自地將基底層之組成及塗佈層之組成注入押模機 (她秦）中，伴隨炼化及研磨後，將基底層之組成及塗佈 層之組成放人-進料模巾，以卿形成—多層光擴散片。 此夕層光擴散片疋一基底層夹於兩塗佈層之三層疊層結 構。之後’量測各個塗佈層之厚度為，量測基底 層之厚度為l，80〇em。 實例對照組1 : 根據實例1之程序製作-多層光擴散片，其中除了以 聚笨乙烯(polystyrene ’ PS)樹月旨作為塗佈基底樹脂之外， 其餘與實例！之程序相同。其中聚笨乙職脂是講f於” ps Japan Coi*p.”。 實例對照組2 : 21 1345081 ·File: TW3873F acrylate crosslinked particles to a base resin to form a component of the base layer. Wherein the average diameter of the 'oxygenated resin particles was 2/zm (available from GE Toshiba Silicone Co. Ltd.). The average diameter of the acrylate crosslinked particles was 8/zm (purchased from Sekisui Chemical Co., Ltd.). Fabrication of a cloth layer: 100 parts by weight of a coated base resin was formed from a methacrylate-styrene (MS) copolymer, and an acrylate crosslinked particle having a content of 1 〇 ppwb was added: an antistatic agent having a content of 1 ppwb, The content is from 1 ppwb 2 light stabilizer to the coating base resin to constitute a composition of the coating layer, wherein the average diameter of the parent granules of the acetoacetate is 20/zm (purchased from Sekisui chemical Co Ltd.). Production of multi-layer light diffusing sheet: The composition of the base layer and the composition of the coating layer are respectively injected into a die-cutting machine (her Qin), and the composition of the base layer and the composition of the coating layer are released after refining and grinding. - Feeding the mask, forming a multilayer light diffuser. The base layer light diffusion sheet has a base layer sandwiched between three laminated layers of the two coating layers. Thereafter, the thickness of each of the coating layers was measured, and the thickness of the substrate layer was measured to be 1,80 〇em. Example Control Group 1: A multilayer light diffusing sheet was produced according to the procedure of Example 1, except that the polystyrene (PS) tree was used as the coating base resin, and the rest and examples! The procedure is the same. Among them, the stupid job is to say "f ps Japan Coi*p." Example control group 2 : 21 1345081 ·

File:TW3873F 根據實例l之程序製作一多層光擴散片，其中除了以 聚甲基丙稀酸甲酉旨（polymethylmethacrylate，PMMA)樹脂 作為基底樹脂之外，其餘與實例對照組1之程序相同。其 中聚甲基丙烯酸曱酯樹脂是購買於”Mitsubishi Rayon Corp.”。 實例對照組3 : 根據實例1之程序製作一多層光擴散片，其中除了以 聚苯乙烯(PS)樹脂作為基底樹脂之外，其餘與實例對照組 1之程序相同。其中聚苯乙烯樹脂是購買於”PS Japan Coirp.”。 實例1及實例對照組1-3之各基底層成份及各塗佈層 成份概括如下表1所示。 表1樣品成份 實例1 實例對照 組1 實例對照 組2 實例對照 組3 基 底 層 基底樹脂 MS/MMS MS/MMS PMMA PS 矽氧樹脂光擴散 劑（ppwb) 2 2 2 2 丙稀酸酯組成 (ppwb) 2 2 2 2 塗 佈 層 塗佈基底樹脂 MS PS PS PS 丙烯酸酯組成 (ppwb) 10 10 10 10 抗靜電劑（ppwb) 1 1 1 1 光穩定劑（ppwb) 1 1 1 1 以下將評估實例1及實例對照組丨_3形成之各多層光 擴散片的垂度（sag)及光學性值。在各測試中，先將各多層 光擴散片製備成為尺寸為50mm X 30mm X 2mm的試 片。並且使各試片之一侧邊固定。 22 1345081 *File: TW3873F A multilayer light-diffusing sheet was produced according to the procedure of Example 1, except that the polymethylmethacrylate (PMMA) resin was used as the base resin, and the procedure of the example control group 1 was the same. Among them, polymethyl methacrylate resin was purchased from "Mitsubishi Rayon Corp.". Example Control Group 3: A multilayer light-diffusing sheet was produced according to the procedure of Example 1, except that the procedure of Example Control 1 was the same except that polystyrene (PS) resin was used as the base resin. Among them, polystyrene resin was purchased from "PS Japan Coirp." The composition of each of the base layers and the composition of each coating layer of Example 1 and Example Control Groups 1-3 are summarized in Table 1 below. Table 1 Sample composition Example 1 Example control group 1 Example control group 2 Example control group 3 Base layer base resin MS/MMS MS/MMS PMMA PS Silicone resin light diffusing agent (ppwb) 2 2 2 2 Acrylate composition (ppwb 2 2 2 2 Coating layer coating base resin MS PS PS PS Acrylate composition (ppwb) 10 10 10 10 Antistatic agent (ppwb) 1 1 1 1 Light stabilizer (ppwb) 1 1 1 1 Evaluation examples will be given below 1 and the sag and optical values of each of the multilayer light diffusing sheets formed by the example control group 丨3. In each test, each of the multilayer light-diffusing sheets was prepared into a test piece having a size of 50 mm X 30 mm X 2 mm. And one side of each test piece is fixed. 22 1345081 *

File:TW3873F 垂度測試的方法如下。量測各試片相對於基準點之距 離，即試片至地面之高度。放置試片於一加熱箱中，設定 溫度與時間為攝氏no度與1小時。然後，再次量測各試 片相對於前述基準點之距離，即垂度（以毫米為單位）。兩 次量測距離之差即為試片因施加熱源而垂直下垂的距 離’記為垂度值。此垂度值是高分子之熱抵抗性的重要數 據。 光學性質評估的方法如下。使各試片受 ATLAS-UVCON輻射器之紫外光幅射線照射，拉設定溫度 與時間為攝氏60度與72小時，以評估各試片之泛黃指數 (Yellow Index，YI)的變化。此為依據ASTMD1925程序之 白色指標（white color coordinates)評估各試片於紫外光幅 射線照射前及照射後所量測的ΔΥΙ值。當Δγι值越小時， 則代表其光抵抗性越大。對於各試片之光穿透率及光散射 率’係藉由霧影儀(hazemeter)進行評估。使各試片黏附於 32 ®寸之背光单元’並以BM-7發光色度計量測背光單元之 發光效率。其中，霧影儀係NDH 5000W®(購買於Nippon Denshoku Industries Co.，Ltd.) ° 垂度及光學性質之測試結果分別如表2-3所示。 表2彎曲測試結果 實例1 實例對照組1 實例對照組2 實例對照組3 結果 Ί Η 下垂度 (mm) 1 10 6 13以上 23 1345081File: The TW3873F sag test is as follows. The distance between each test piece relative to the reference point, that is, the height of the test piece to the ground, is measured. Place the test piece in a heating box and set the temperature and time to degrees Celsius and 1 hour. Then, the distance of each test piece relative to the aforementioned reference point, i.e., the sag (in millimeters), is measured again. The difference between the two measured distances is the distance at which the test piece hangs vertically due to the application of the heat source, which is recorded as the sag value. This sag value is an important data for the thermal resistance of the polymer. The method of optical property evaluation is as follows. Each test piece was irradiated with ultraviolet light from an ATLAS-UVCON radiator, and the set temperature and time were set at 60 degrees Celsius and 72 hours to evaluate the change of the yellow index (YI) of each test piece. This is a measure of the ΔΥΙ value of each test piece before and after irradiation with ultraviolet radiation according to the white color coordinates of the ASTM D1925 procedure. When the value of Δγι is smaller, it means that the light resistance is greater. The light transmittance and light scattering rate of each test piece were evaluated by a hazemeter. Each test piece was adhered to a 32-inch backlight unit' and the luminous efficiency of the backlight unit was measured by BM-7 luminosity. Among them, the haze meter NDH 5000W® (purchased from Nippon Denshoku Industries Co., Ltd.) ° The test results of the sag and optical properties are shown in Table 2-3. Table 2 Bend test results Example 1 Example control group 1 Example control group 2 Example control group 3 Results Ί Η Droop (mm) 1 10 6 13 or more 23 1345081

File:TW3873F 如表2所示，實例1之樹脂（即為包括MS及MMS混 合物之基底樹脂）顯示出最佳的垂度結果，即垂度值為 . 1mm。換句話說，實例1之試片對於施加熱源的變化量最 小，因此其具有最優異的熱抵抗性。 表3光學測試結果 實例1 實例對照組 1 實例對照組 2 實例對照組 3 光抵抗性 (ΔΥΙ) 8 11 5 15 光穿透率 (%) 51.1 52.0 62.3 53.2 光散射性 (%) 93.1 93.0 92.9 93.1 發光效率 (cd/m2) 11,120 11,110 11,141 11,124 如表3所示，實例1之樹脂（即為包括MS及MMS混 合物之基底樹脂）與實例對照組1-3相比之下，實例1顯示 出最優異的紫外光光抵抗性，且其光穿透率、光擴散率及 發光效率仍與實例對照組1 -3大致相同。 如第4A圖及第4B圖所示，依照本發明之實施例之 光擴散片係應用於一顯示裝置中。更具體的說，分別如第 3A圖及第3B圖所示，液晶顯示器（未繪示）之背光單元40 及41分別包括至少一個光源100、一反射片110及一光擴 散片20及21。於此，在第4A圖及第4B圖中，背光單元 40及41係分別應用於液晶顯示器400及410中。 使用本發明之實施例之光擴散片的背光單元，係可藉 由光擴散片上之無定形的浮凸圖案，而得到改良的光穿透 率及光擴散率，並藉以增強亮度。此外，使用本發明之實 24 1345081 « .File: TW3873F As shown in Table 2, the resin of Example 1 (i.e., the base resin including the MS and MMS mixture) showed the best sag result, i.e., the sag value was .1 mm. In other words, the test piece of Example 1 had the smallest amount of change for the application of the heat source, and thus it had the most excellent heat resistance. Table 3 Optical test results Example 1 Example control group 1 Example control group 2 Example control group 3 Light resistance (ΔΥΙ) 8 11 5 15 Light transmittance (%) 51.1 52.0 62.3 53.2 Light scattering (%) 93.1 93.0 92.9 93.1 Luminous efficiency (cd/m2) 11,120 11,110 11,141 11,124 As shown in Table 3, the resin of Example 1 (i.e., the base resin including MS and MMS mixture) was compared with the example control group 1-3, and Example 1 showed the most Excellent UV light resistance, and its light transmittance, light diffusivity and luminous efficiency are still substantially the same as in the example control group 1-3. As shown in Figs. 4A and 4B, a light diffusing film according to an embodiment of the present invention is applied to a display device. More specifically, as shown in FIGS. 3A and 3B, the backlight units 40 and 41 of the liquid crystal display (not shown) respectively include at least one light source 100, a reflection sheet 110, and a light diffusion sheet 20 and 21. Here, in FIGS. 4A and 4B, the backlight units 40 and 41 are applied to the liquid crystal displays 400 and 410, respectively. The backlight unit using the light-diffusing sheet of the embodiment of the present invention can obtain improved light transmittance and light diffusivity by the amorphous embossed pattern on the light-diffusing sheet, thereby enhancing the brightness. In addition, the use of the invention of the real 24 1345081 « .

File:TW3873F 施例之光擴散片的背光單元，係可藉由MS/MMS樹脂之 混合物及其多層結構，而具備優秀的光抵抗性及潤濕性。 最後，使用本發明之實施例之光擴散片的背光單元，其與 傳統背光單元相比之下，更可擁有相對較低的生產設備磨 耗及損壞。 综上所述，雖然本發明已以一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内，當可作各種 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。File: TW3873F The backlight unit of the light diffusing film of the example is excellent in light resistance and wettability by a mixture of MS/MMS resin and its multilayer structure. Finally, the backlight unit using the light diffusing sheet of the embodiment of the present invention can have relatively low wear and damage of the production equipment as compared with the conventional backlight unit. In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

25 134.508125 134.5081

File:TW3873F 【圖式簡單說明】 第1圖緣示依照本發明一較佳實施例之光擴散片的 . 示意圖。 第2圖繪示依照本發明另一較佳實施例之光擴散片 的示意圖。 第3A圖繪示依照具備本發明第1圖之光擴散片之背 光單元的剖面圖。 第3B圖繪示依照具備本發明第2圖之光擴散片之背 _ 光單元的剖面圖。 第4A圖繪示依照具備本發明第1圖之光擴散片之顯 示裝置的分解圖。 第4B圖繪示依照具備本發明第2圖之光擴散片之顯 示裝置的分解圖。 【主要元件符號說明】 20、21 :光擴散片 胃 40、41 :背光單元 100 :光源 110 :反射片 200 :基底層 210 :塗佈層 211 :浮凸圖案 400、410 :液晶顯示裝置 26File: TW3873F [Simple Description of the Drawing] Fig. 1 is a schematic view showing a light diffusing sheet according to a preferred embodiment of the present invention. Fig. 2 is a schematic view showing a light diffusing sheet according to another preferred embodiment of the present invention. Fig. 3A is a cross-sectional view showing a backlight unit according to the light diffusion sheet of Fig. 1 of the present invention. Fig. 3B is a cross-sectional view showing the back light unit according to the light diffusing sheet of Fig. 2 of the present invention. Fig. 4A is an exploded view showing a display device according to the light diffusing sheet of Fig. 1 of the present invention. Fig. 4B is an exploded view showing the display device in accordance with the light diffusing sheet of Fig. 2 of the present invention. [Description of main component symbols] 20, 21: Light diffusing film Stomach 40, 41: Backlight unit 100: Light source 110: Reflecting sheet 200: Base layer 210: Coating layer 211: Embossed pattern 400, 410: Liquid crystal display device 26

Claims (1)

1345081 * · 〆 File:TW3873F •v 十、申請專利範圍： 1. 一種用於顯示裝置之光擴散片（light diffusion . sheet)，該光擴散片包括： 一基底層，該基底層包括： 一基底樹脂，該基底樹脂係一曱基丙烯酸酯-苯 乙烯(methacrylate styrene，ΜΑ-ST)共聚物與一甲基丙烯酸 甲酯-苯乙稀(methylmethacrylate styrene，MMA-ST)共聚物 之混合物；及 鲁 一第一光擴散劑(light diffuser)，該第一光擴散 劑之含量以該基底樹脂為基準之重量百分比（parts by weight per 100 parts by weight of the base resin, ppwb)為 0.2ppwb_20ppwb ;以及 至少一塗佈層位於該基底層上方，該塗佈層包括： 一塗佈基底樹脂，該塗佈基底樹脂係一曱基丙 烯酸曱酯-苯乙烯共聚物； 一第二光擴散劑，該第二光擴散劑之含量以該 • 塗佈基底樹脂為基準之重量百分比（parts by weight pei· 100 parts by weight of the base coating resin, ppwb)為 0.1ppwb-30ppwb ； 一紫外光吸收劑(UV absorber) ’該紫外光吸收劑 之含量以該塗佈基底樹脂為基準之重量百分比為 0.01ppwb-2ppwb ;及 一抗靜電劑（antistatic agent) ’該抗靜電劑之含 量以該塗佈基底樹脂為基準之重量百分比為 27 1345081 File:TW3873F O.OOlppwb-lOppwb ° 2. 如申請專利範圍第丨項所述之光擴散片，其中該 基底層之該甲基丙烯峻酯-苯乙烯共聚物包括一重量百分 比為2%-20°/。之甲基丙烯酸酯單體及一重量百分比為 80%-98%之苯乙烯單體。1345081 * · 〆 File: TW3873F • v X. Patent Application Range: 1. A light diffusion sheet for a display device, the light diffusion sheet comprising: a substrate layer, the substrate layer comprising: a substrate a resin, the base resin is a mixture of a methacrylate styrene (ΜΑ-ST) copolymer and a methylmethacrylate styrene (MMA-ST) copolymer; a first light diffuser having a content by weight per 100 parts by weight of the base resin (ppwb) of 0.2 ppwb_20 ppwb; and at least A coating layer is disposed above the substrate layer, the coating layer comprising: a coating base resin, the coating base resin is a mercapto acrylate-styrene copolymer; a second light diffusing agent, the second The content of the light diffusing agent is 0.1 ppwb based on the weight of the coating base resin (parts by weight pei·100 parts by weight of the base coating resin, ppwb). -30 ppwb; an ultraviolet absorber (UV absorber) The content of the ultraviolet light absorber is 0.01 ppwb to 2 ppwb based on the weight of the coated base resin; and an antistatic agent 'antistatic agent' The content of the agent is based on the weight of the coated base resin of 27, 1345081. File: TW3873F O.OOlppwb-lOppwb ° 2. The light diffusing sheet of the above-mentioned claim, wherein the methyl layer of the base layer The propylene succinyl ester-styrene copolymer comprises from 1% to 20% by weight of a weight percent. The methacrylate monomer and a styrene monomer in an amount of 80% to 98% by weight. 3. 如申請專利範圍第丨項所述之光擴散片，其中該 基底層之該甲基丙烯酸甲酯·苯乙烯共聚物包括一重量百 分比為6%-94%之曱基丙烯酸曱酯單體及一重量百分比為 6%-94%之苯乙烯單體。 4.如申請專利範園第1項所述之光擴散片，其中該 第一光擴散劑包括一含量為〇.lppwb-10ppwb之矽氧烧 (siloxane)組成及一含量為〇 lppwb_10ppwb之丙烯酸酯 (acrylic)組成，其中該矽氧烷組成之平均直徑為 //m，該丙烯酸酯組成之平均直徑為。 塗佈層之該第二光擴散劑包括一平均直徑為I" m^5Q 5·如申請專利範圍第丨項所述之光擴散片，其中該 軋垸級成 丙烯酸醋組成、一平均直徑為1 # m〜20 // m之石夕 或該丙烯酸酯組成與該石夕氧烧組成之組合。 6.如申請專利範圍第5項所述之光擴散片，| 塗佈層之該第二光擴散劑包括之該矽氧烷組成，係包 聚二甲基石夕氧烧(polydimethylsiloxane)、一聚二己 烧(polydiethylsiloxane)及一具有三維網狀結構之石夕氣士 — (silicone resin)之其中之一或多個之組合。 曰 ，其中該 7.如申請專利範圍第5項所述之光擴散片 28 1345081 FiIe:TW3873F 塗佈層之該第二光擴散劑包括之該丙烯酸酯組成，係為一 甲基丙婦酸甲醋（methyl methacrylate)、一曱基丙稀酸乙酉旨 (ethyl methacrylate)、一曱基丙烯酸丁酯（butyl methacrylate)、一甲基丙烯酸環已酉旨（cyclohexyl methacrylate)、一甲基丙烯酸苯酉旨（phenyl methacrylate)、 一甲基丙浠酸苯甲醋（benzyl methacrylate)、一丙稀酸甲酉旨 (methyl acrylate)、一 丙稀酸乙酉旨（ethyl acrylate)、一 丙婦酸 丁自旨（butyl acrylate)、一 丙稀酸環已醋（cyclohexyl 春 acrylate)、一丙婦酸苯醋（phenyl acrylate)、及一丙烯酸苯 曱酯（benzyl acrylate)之其中之一或多個之組合。 8. 如申請專利範圍第1項所述之光擴散片，其中該 紫外光吸收劑用以吸收波長為250nm-280nm之紫外光輻 射。 9. 如申請專利範圍第1項所述之光擴散片，其中該 紫外光吸收劑係為一二苯酮（benzophenone)、一笨基三口坐 (benzotriazole)、一 氰基丙烯酸酯（cyanoacrylate)、及一鎳 基錯合鹽（nickel complex salt)之其中之一或多個之組合。 10. 如申請專利範圍第1項所述之光擴散片，其中該 抗靜電劑係為一聚醚硫亞氨基化合物（polyether imide amide)、一聚__(polyether ester)、一聚喊酯氣基化合物 (polyether ester amide)、一 聚亞烧基二醇（polyalkylene glycol)、一十二烧苯硫項酸驗金屬（alkali metal dodecylbenzene sulfonate)、一叔胺化合物（tertiary amine)、 一季敍化合物（quaternary ammonium)、一 氣化納（sodium 29 1345081 File:TW3873F chloride)、及一烧基胺化合物（ykyi amine)之其中之一或多 個之組合。 11·如申請專利範圍第1項所述之光擴散片，其中該 基底層之厚度為 12. 如申請專利範圍第1項所述之光擴散片，其中該 塗佈層之厚度為10/im-1000//m。 13. 如申請專利範圍第1項所述之光擴散片，其中該 塗佈層包括一浮凸圖案。 14. 如申請專利範圍第13項所述之光擴散片，其中 該/参凸圖案係無定形（amorphous)，且該浮凸圖案之表面粗 链度為 0.l//m_20/zm。 15. 如申請專利範圍第1項所述之光擴散片，其中該 塗佈層更包括一光穩定劑（light stabilizer)。 16. 如申請專利範圍第1項所述之光擴散片，其中該 光擴散片包括兩塗佈層。 17. 如申請專利範圍第16項所述之光擴散片，其中 該基底層失在該兩塗佈層中間。 18·—種背光單元，包括： 一光源； 至少一反射片；以及 —光擴散片，該光擴散片包括一基底層及至少一塗佈 層’該基底層包括一基底樹脂及一第一光擴散劑，該基底 樹·脂係一甲基丙烯酸酯苯乙烯共聚物與一甲基丙烯酸曱 醋-苯乙稀共聚物之混合物，該第一光擴散劑之含量為 30 134,5081 File:TW3873F 0.2ppwb-20ppwb，該塗佈層位於該基底層上方，該塗佈層 包括一塗佈基底樹脂、一第二光擴散劑、一紫外光吸收劑 及一抗靜電劑，該塗佈基底樹脂係一甲基丙烯酸甲酯-笨乙 烯共聚物，該第二光擴散劑之含量為〇.lppwb-30ppwb，該 紫外光吸收劑之含量為0.01ppwb-2ppwb，該抗靜電劑之含 量為 O.OOlppwb-lOppwb。 19. 一種顯示裝置，包括： 一顯示面板；以及 籲 一背光單元’該背光單元包括一光源及一光擴散片， 該光擴散片包括一基底層及至少一塗佈層，該基底層包括 一基底樹脂及一第一光擴散劑，該基底樹脂係一甲基丙烯 酸酯-苯乙烯共聚物與一甲基丙烯酸甲酯-苯乙烯共聚物之 混合物，該第一光擴散劑之含量為0.2ppwb-20ppwb，該塗 佈層位於該基底層上，該塗佈層包括一塗佈基底樹脂、一 第二光擴散劑、一紫外光吸收劑及一抗靜電劑，該塗佈基 底樹脂係一曱基丙烯酸曱酯-苯乙烯共聚物，該第二光擴散 ® 劑之含量為0.1ppwb-30ppwb，該紫外光吸收劑之含量為 0.01ppwb-2ppwb ’ 該抗靜電劑之含量為 O.OOlppwb〜lOppwb。 20. 如申請專利範圍第19項所述之顯示裝置，其中 該顯#裝置係一液晶顯示器。 313. The light diffusing sheet of claim 2, wherein the methyl methacrylate styrene copolymer of the base layer comprises from 6% to 94% by weight of decyl methacrylate monomer. And a percentage by weight of 6% to 94% of styrene monomer. 4. The light diffusing sheet according to claim 1, wherein the first light diffusing agent comprises a siloxane composition having a content of 〇.lppwb-10ppwb and an acrylate having a content of 〇lppwb_10ppwb. An (acrylic) composition in which the average diameter of the composition of the decane is // m, and the average diameter of the acrylate composition is . The second light diffusing agent of the coating layer comprises a light diffusing sheet having an average diameter of I" m^5Q 5, wherein the rolling grade is composed of acrylic vinegar and an average diameter is 1 #m~20 // The combination of the composition of the acrylate or the composition of the oxylate. 6. The light diffusing sheet of claim 5, wherein the second light diffusing agent of the coating layer comprises the siloxane composition, which is a polydimethyl siloxane, a polydimethyl siloxane. A combination of one or more of polydiethylsiloxane and a silicone resin having a three-dimensional network structure.曰 其中 7 7 7 7 7 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 Methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, methacrylic acid benzoate (phenyl methacrylate), benzyl methacrylate, methyl acrylate, ethyl acrylate, butyl acetonate A combination of one or more of butyl acrylate), cyclohexyl acrylate, phenyl acrylate, and benzyl acrylate. 8. The light diffusing sheet of claim 1, wherein the ultraviolet light absorber is for absorbing ultraviolet light having a wavelength of from 250 nm to 280 nm. 9. The light diffusing sheet of claim 1, wherein the ultraviolet light absorber is benzophenone, benzotriazole, cyanoacrylate, And a combination of one or more of a nickel complex salt. 10. The light diffusing sheet of claim 1, wherein the antistatic agent is a polyether imide amide, a polyether ester, a polyester ester Polyether ester amide, polyalkylene glycol, alcohol metal dodecylbenzene sulfonate, tertiary amine, one season compound A combination of one or more of quaternary ammonium), sodium 29 1345081 File: TW3873F chloride, and ykyi amine. The light-diffusing sheet of claim 1, wherein the thickness of the base layer is 12. The light-diffusing sheet of claim 1, wherein the thickness of the coating layer is 10/im. -1000//m. 13. The light diffusing sheet of claim 1, wherein the coating layer comprises an embossed pattern. 14. The light diffusing sheet of claim 13, wherein the/the convex pattern is amorphous, and the surface roughness of the embossed pattern is 0.1 l/m_20/zm. 15. The light diffusing sheet of claim 1, wherein the coating layer further comprises a light stabilizer. 16. The light diffusing sheet of claim 1, wherein the light diffusing sheet comprises two coating layers. 17. The light diffusing sheet of claim 16, wherein the base layer is lost between the two coating layers. a backlight unit comprising: a light source; at least one reflective sheet; and a light diffusing sheet comprising a base layer and at least one coating layer, the base layer comprising a base resin and a first light a diffusing agent, a mixture of the base resin, a methacrylate styrene copolymer, and a methacrylic acid vinegar-styrene copolymer, the first light diffusing agent having a content of 30 134, 5081 File: TW3873F 0.2ppwb-20ppwb, the coating layer is located above the base layer, the coating layer comprises a coating base resin, a second light diffusing agent, an ultraviolet light absorber and an antistatic agent, and the coating base resin is The content of the second light diffusing agent is 〇.lppwb-30ppwb, the content of the ultraviolet light absorbing agent is 0.01ppwb-2ppwb, and the content of the antistatic agent is 0.011ppwb. -lOppwb. 19. A display device comprising: a display panel; and a backlight unit comprising: a light source and a light diffusing sheet, the light diffusing sheet comprising a base layer and at least one coating layer, the base layer comprising a base resin and a first light diffusing agent, the base resin being a mixture of a monomethacrylate-styrene copolymer and a methyl methacrylate-styrene copolymer, the first light diffusing agent having a content of 0.2 ppwb -20 ppwb, the coating layer is located on the base layer, the coating layer comprises a coating base resin, a second light diffusing agent, an ultraviolet light absorbing agent and an antistatic agent, and the coating base resin is a 曱The methacrylate-styrene copolymer, the content of the second light diffusing agent is 0.1 ppwb-30 ppwb, and the content of the ultraviolet light absorbing agent is 0.01 ppwb-2 ppwb. The content of the antistatic agent is 0.01 ppwb to lOppwb. . 20. The display device of claim 19, wherein the display device is a liquid crystal display. 31
TW096123144A 2006-07-07 2007-06-26 Light diffusion sheet for a display device TWI345081B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20060064065 2006-07-07
KR1020060122521A KR100893520B1 (en) 2006-07-07 2006-12-05 Light diffuser plate for LCD back light unit

Publications (2)

Publication Number Publication Date
TW200804872A TW200804872A (en) 2008-01-16
TWI345081B true TWI345081B (en) 2011-07-11

Family

ID=39041977

Family Applications (1)

Application Number Title Priority Date Filing Date
TW096123144A TWI345081B (en) 2006-07-07 2007-06-26 Light diffusion sheet for a display device

Country Status (3)

Country Link
KR (1) KR100893520B1 (en)
CN (1) CN100538407C (en)
TW (1) TWI345081B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101035872B1 (en) * 2008-12-18 2011-05-19 제일모직주식회사 Multi-layered light diffuser plate with excellent impact resistance and crack, back light unit and LCD using the light diffuser plate
KR101127106B1 (en) * 2009-12-30 2012-04-30 제일모직주식회사 Light diffuser used in liquid crystal display device
CN102337016A (en) * 2011-07-27 2012-02-01 安徽集虹材料科技有限公司 Preparation method of light-diffusion master batch
TWI515490B (en) * 2013-09-25 2016-01-01 友達光電股份有限公司 Display device
CN104109385B (en) * 2014-06-27 2017-10-17 广东昌亿新材料有限公司 A kind of PMMA light diffusing agents and a kind of light spread PMMA materials
CN104109384A (en) * 2014-06-27 2014-10-22 惠州市昌亿新材料有限公司 Light-diffusing agent for polycarbonate and light-diffusing polycarbonate material
KR101941210B1 (en) 2016-08-12 2019-01-22 세원정공 주식회사 Multi-layer expandable light diffusion sheet and manufacturing method thereof
KR102125497B1 (en) 2019-08-09 2020-06-22 하현대 Light-diffusion and anti-glare properties-integrated monolayer sheet and method for manufacturing the same
KR102117519B1 (en) 2019-08-09 2020-06-01 하현대 Light-diffusion and anti-glare properties-integrated two-layer sheet and method for manufacturing the same
CN113913008B (en) * 2021-11-15 2022-06-24 聊城鲁西聚碳酸酯有限公司 Light diffusant and flame-retardant light diffusion polycarbonate composition and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3669299B2 (en) 2001-07-12 2005-07-06 住友化学株式会社 Methyl methacrylate resin composition and molded article thereof
KR100641841B1 (en) * 2004-09-02 2006-11-02 제일모직주식회사 Multi-layered Light Diffuser developed warpage and Liquid Crystal Display Using the Same
KR100593470B1 (en) * 2004-11-01 2006-06-28 제일모직주식회사 Liquid crystal display device comprising a light diffusion plate and a light diffusion plate
KR100793179B1 (en) * 2005-02-01 2008-01-10 주식회사 코오롱 Light-diffusion plate

Also Published As

Publication number Publication date
CN100538407C (en) 2009-09-09
CN101109829A (en) 2008-01-23
KR20080005048A (en) 2008-01-10
KR100893520B1 (en) 2009-04-17
TW200804872A (en) 2008-01-16

Similar Documents

Publication Publication Date Title
TWI345081B (en) Light diffusion sheet for a display device
TWI332103B (en) Light-diffusing film
US9097829B2 (en) Backlight unit with patterned light guide panel
JP2007133173A (en) Light diffusing sheet, complex light diffusing plate, and back light unit using those
KR20080064975A (en) Light diffusion plate for liquid crystal display
JPWO2008114820A1 (en) Backlight device and member
KR20040084786A (en) Resin plate
US20080008845A1 (en) Light diffusion sheet for a display device
JP4033695B2 (en) Newton ring prevention sheet
KR100654241B1 (en) Light diffuser plate for lcd back light unit
KR100573372B1 (en) Light diffusion film with transparent plastic base film for liquid crystal display
KR20090054306A (en) Light diffusion plate, and back light unit thereby, lcd device thereby
KR20070117159A (en) Embo unstretched optical film with superior optical properties and heat resistance
KR20100001582A (en) Light diffusion plate, backlight device having the same, and liquid crystal display device
KR100668776B1 (en) Light diffuser plate for lcd back light unit
KR100813738B1 (en) Light diffuser with excellent scratch resistance and optical properties
KR100810685B1 (en) Light diffuser plate for lcd back light unit
KR100641841B1 (en) Multi-layered Light Diffuser developed warpage and Liquid Crystal Display Using the Same
JP2006243084A (en) Light diffusion plate
JP2006171409A (en) Low water absorbing light diffusion plate
TW201910889A (en) Buffer sheet and flat panel display
KR100724337B1 (en) Light diffuser plate for LCD back light unit
KR100973599B1 (en) Optical film eliminating protective films and Preparing thereof
KR101187552B1 (en) Diffusion plate
KR100646374B1 (en) Light diffuser plate for lcd back light unit