TWI343870B - High brightness light diffusion sheet for backlight unit of liquid crystal display and method for manufacturing the same - Google Patents
High brightness light diffusion sheet for backlight unit of liquid crystal display and method for manufacturing the same Download PDFInfo
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- G—PHYSICS
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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- 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
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- 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
- G02B5/0231—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 microprismatic or micropyramidal shape
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
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- Optical Elements Other Than Lenses (AREA)
Description
1343870 九、發明說明: 【發明所屬之技術領域】 本發明係關於一種應用於液晶顯示器背光模組之高輝 度光擴散板及其製造方法,更特別的是,該應用於液晶顯 示器背光模組之高輝度光擴散板能防止雙折射、阻塞及發 生於其上之刮傷,及該高輝度光擴散板之製造方法。 【先前技術】 ® 最近,越來越多將液晶顯示器(LCDs)作為筆記型電 腦之監視器、桌上型電腦之大尺寸監視器及電視之監視 • 器。因此,作為該些液晶顯示器之大尺寸及高輝度背光模 • 組之需求亦隨之增加。 第一圖係顯示已主要地被採用之背光模組實施例。如 第一圖所示該背光模組包括使用一陰極螢光燈管(尤其是 一冷陰極螢光燈管(CCFL))作為一光源100之一導光板 φ (LGP) 120。該背光模組亦包括一光擴散板130、棱鏡板 140與150及一保護板160,上述該等構件係依此順序堆疊 於導光板120之一光發射表面。一反射板n〇係堆疊於導 光板120之另一表面’該表面係相對於該光發射表面。 該背光模組之光擴散板130係將光線擴散至一營幕之 整個表面’並且將光線折射轉變為均勻的光線而射向該背 光模組之一正面’該光線係由位於該光擴散板13〇之一側 面或背面之該光源100所發射。 該光擴散板130係包含一光擴散層、一底板及—背面 1343870 塗佈層。形成該光擴散層之組成係包含一接合樹脂、一硬 化劑、一抗靜電劑、光擴散粒子及一溶劑。該光擴散粒子 係與該接合樹脂配合以增加該光線之穿透度及擴散度。對 該等光擴散粒子而言,可使用各種有機及無機粒子。於使 用有機粒子作為該荨光擴散粒子的情況下,則使用一有機 溶劑,例如乙醇、丙酮、甲基異丁基酮(MIBK)、甲基乙 基酮(MEK)、乙酸乙酯或曱笨。該有機溶劑具較大比重係 與一般光擴散粒子不同。基於此一原因,該等光擴散粒子 於有機溶劑之分散性係被降低。更進一步地,該等光擴散 粒子會於製造過程的等待時間内發生沈澱。因此,該等粒 系不均勻地分散於該光擴散層。再者,該上述溶劑具有 I弗點。因此難以獲得整平性質〇eveiingp哪_),導致 貝於塗佈後之乾燥過程中將該光擴散層予以整平。 °亥光擴散板U0之背面塗佈層係安裝於與燈管直接接 之位置’塗佈須具有耐熱性以對抗光源所產生的熱。此 中二鄰接該背面塗佈層之位置執行導光板模組化之過程 核17:產生振動’而該振動會造成該背面塗佈層與該導光 面塗你^間產生磨擦,進而刮傷該背面塗佈層,據此該背 面塗佈層必須具有極高絲面硬度。 【發明内容】 描祉/本發明係馨於上述問題點而產生,I目的係為 k供應用於液a 工 可防止因…a0‘㈣背光模組之—高輝度光擴散板,其 射而降低輝度、可減少發生於光擴散板之背 1343870 面的刮傷並可消除卩且塞β 本發明之另一目的係提供一製造方法,用以製造一應 用於液日a顯不器月光模組之高輝度光擴散板,該南輝度光 擴散板可增加輝度、可減少發生於光擴散板之背面的刮傷 並可消除阻塞。 根據本發明之一態樣,可藉由提出一應用於液晶顯示 器背光模組之一高輝度光擴散板,以達成上述及其他目 的,s亥南輝度光擴散板包括: 一底板; 一光擴散層係形成於底板之一表面’其中該光擴散層 之成f々係包括光擴散粒子(其比重至1 ·2 g/cm3 ’粒子尺 寸之變異係數不超過15% ,該變異係數係以下列表式計算 求得),用以調整該等光擴散粒子沈澱速率之一溶劑(比重 〇.82至L0 g/cm3 ’沸點130至140。(3 ),及與該等光擴散粒子 折射率之差值不大於〇〇1之一第一接合樹脂。 【表式】 變異係數==(標準差+平均數)χΙΟΟ ;及 一背面塗佈層係形成於底板之另一表面塗佈’其中該 令面塗佈層包含摩擦係數不大於0.36 (MIU)之珠粒,及 張力彈性模數不大於300MPa之一第二接合樹脂。 該成份中的固含量可在38至42% 。 該’谷劑可為含有乙酸丁自旨及二曱苯之一混合溶液。 以乙酸丁酯100重量份為基準計算,該混合溶液可含 1343870 有2〇到150重量份之二甲苯。 _以該第一接合樹脂100重量份為基準計算,該成份可 3有40到140重量份之該等光擴散粒子。 該等光擴散粒子可含有兩種平均粒徑不同之粒子。 該溶劑之比重可為0.86至1.0 g/cm3。 該等珠粒可為耐綸基材或矽基材之化合物。 再者,該第一接合樹脂可為一可紫外線固化之胺基曱 齩酉曰-丙烯酸系樹脂,且該可紫外線固化之胺甲酸乙酯-丙 稀酸樹脂可為一三元共聚合物,該三元共聚合物係由三(2_ 丙烯氧乙基)異氰酸展醋_2丙烯酸、(!_亞甲基乙基)雙⑷· ^苯基氧-2,!-乙烧二亞基氧_2山乙炫二亞基)酉旨及】·氣氧_ 壤己基-苯基酮所構成。 、,根據本發明之另—態樣,其係提出—種製造方法,用 以製造應用於液晶顯示器背光模組之一高輝度光擴散板, ^製造方法包括製備—光擴散層溶液,其包含光擴散粒子 粒子,寸之變異餘*超過15%,該變異係數係以上列 表式計算求得)、—溶劑(比重0.82到gW:) & -接合樹脂1該光擴散層溶液施加於以聚對笨 =(抓)製絲板之-表面,並乾_施_綱 層溶液;及形成於底板另—表面之背面塗佈層,面= 佈層包含摩擦絲不大於〇.36 (Μίυ) ” 合樹脂。 ’之珠粒及-第二接 於該成份之製備中,該等光擴散粒子可 平均粒徑之粒子。 3 ##種不同 1343870 【實施方式】 炫參照隨附之圖式詳細地說明本發明之較佳具體實 例。 、 、雖然基於說明之目的揭示本發明之較佳具體實施例, 然而熟f本技藝者應瞭解可進行各種修改、增加及替代。 此等具體實施例不應視做限财發明之範圍及精神。為能 更清楚地說明本發明,因此於該等圖式中,放大各種薄: 或£域之尺寸或厚度。 第二圖係表示依據本發明之—具體實施例之應用於背 光模組高輝度光擴散板之一剖面圖。參考第二圖本發明之 光擴散板包括一底板210、形成於該底板21〇上表面之— 光擴散層200及一層疊於該底板21〇下表面之一背面塗佈 層 220。 該光擴散層200係將由LCD 一背光模組射出之光線加 以散射或折射,因此可將該光線均勻地擴散至一螢幕之整 •個表面。如上述,該光擴散層2〇〇之組成包括一第一接^ 樹脂、-硬化劑、光擴散粒子、—抗靜電劑、一分散劑及 一溶劑。 該溶劑係為將該第-接合樹脂、該硬化劑、該光擴散 粒子、該抗靜電劑及該分散劑溶解之材料,以使該等能均 特疋。t ^合劑應對該第一接合樹脂及該等 先擴散粒子具有高分散性’以使兮 分散於該第一接合樹脂中。依據本發明中 板之製造過程中,該溶劑亦應防止該等光擴:粒;沈二 1J4387〇 s亥第一接合樹脂中,亦即防止該等光擴散粒子不约勾地八 散於該第一接合樹脂中。因此’該溶劑之比重可為〇 82至 hOg/cm3。較佳是,該溶劑之比重為0.86至i.〇g/cm3,且 彿點為130至140°C。1343870 IX. Description of the Invention: [Technical Field] The present invention relates to a high-intensity light diffusing plate applied to a backlight module of a liquid crystal display and a manufacturing method thereof, and more particularly, to a backlight module of a liquid crystal display The high-intensity light diffusing plate can prevent birefringence, clogging, and scratches occurring thereon, and a method of manufacturing the high-intensity light diffusing plate. [Prior Art] ® Recently, liquid crystal displays (LCDs) have been increasingly used as monitors for notebook computers, large-size monitors for desktop computers, and monitors for televisions. Therefore, the demand for large-size and high-brightness backlight modules of these liquid crystal displays has also increased. The first figure shows an embodiment of a backlight module that has been primarily employed. As shown in the first figure, the backlight module includes a cathode fluorescent lamp (especially a cold cathode fluorescent lamp (CCFL)) as a light source plate φ (LGP) 120. The backlight module also includes a light diffusing plate 130, prism plates 140 and 150, and a protective plate 160. The components are stacked on the light emitting surface of one of the light guide plates 120 in this order. A reflective plate is stacked on the other surface of the light guide plate 120. The surface is opposite to the light emitting surface. The light diffusing plate 130 of the backlight module diffuses light to the entire surface of a battalion and converts light refracting into uniform light and strikes a front surface of the backlight module. The light is located at the light diffusing plate. The light source 100 is emitted from one side or back of the 13 inch. The light diffusing plate 130 comprises a light diffusing layer, a bottom plate and a back surface 1343870 coating layer. The composition for forming the light diffusion layer comprises a bonding resin, a hardener, an antistatic agent, light diffusing particles, and a solvent. The light diffusing particles are blended with the bonding resin to increase the transmittance and diffusivity of the light. For the light-diffusing particles, various organic and inorganic particles can be used. In the case where organic particles are used as the calendering diffusion particles, an organic solvent such as ethanol, acetone, methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK), ethyl acetate or hydrazine is used. . The organic solvent has a large specific gravity different from that of general light-diffusing particles. For this reason, the dispersibility of the light-diffusing particles in an organic solvent is lowered. Further, the light diffusing particles will precipitate during the waiting time of the manufacturing process. Therefore, the granules are unevenly dispersed in the light diffusion layer. Further, the above solvent has an I. point. Therefore, it is difficult to obtain the leveling property 〇eveiingp which causes the shell to be flattened during the drying process after coating. The back coating layer of the light diffusing plate U0 is mounted at a position directly connected to the tube. The coating must have heat resistance against the heat generated by the light source. The middle two adjacent to the position of the back coating layer performs a process of modulating the light guide plate core 17: generating vibrations, and the vibration causes friction between the back coating layer and the light guiding surface, thereby scratching The back coating layer, according to which the back coating layer must have a very high surface hardness. SUMMARY OF THE INVENTION The description/presentation of the present invention occurs in the above-mentioned problem, and the purpose of the present invention is to provide a high-intensity light diffusing plate for the backlight module of the a0' (four) backlight module. Reducing the luminance, reducing the scratches occurring on the back surface of the light diffusing plate 1343870 and eliminating the defects and the plug β. Another object of the present invention is to provide a manufacturing method for manufacturing a liquid crystal model The high-intensity light diffusing plate of the group can increase the brightness, reduce the scratches occurring on the back side of the light diffusing plate and eliminate the blockage. According to one aspect of the present invention, a high-intensity light diffusing plate applied to a backlight module of a liquid crystal display can be used to achieve the above and other objects. The s-Huangguang light diffusing plate comprises: a bottom plate; a light diffusion The layer is formed on one surface of the bottom plate, wherein the light diffusion layer comprises light diffusion particles (the specific gravity of which is 1 2 g/cm 3 'the coefficient of variation of the particle size does not exceed 15%, and the coefficient of variation is the following list Calculated by the formula) to adjust the rate of precipitation of the light-diffusing particles (the specific gravity 〇.82 to L0 g/cm3 'boiling point 130 to 140. (3), and the difference between the refractive indices of the light-diffusing particles The value is not greater than one of the first joining resins of 〇〇 1. [Formula] Coefficient of variation == (standard deviation + average) χΙΟΟ; and a back coating layer is formed on the other surface of the bottom plate. The top coating layer comprises a bead having a coefficient of friction of not more than 0.36 (MIU) and a second bonding resin having a tensile modulus of not more than 300 MPa. The solid content of the component may be 38 to 42%. It is a mixture containing butyl acetate and one of diphenylbenzene. Based on 100 parts by weight of butyl acetate, the mixed solution may contain 2 to 150 parts by weight of xylene in 1343870. _ Based on 100 parts by weight of the first bonding resin, the composition may have 3 Up to 140 parts by weight of the light-diffusing particles. The light-diffusing particles may contain two particles having different average particle diameters. The specific gravity of the solvent may be 0.86 to 1.0 g/cm3. The beads may be nylon substrates. Or the compound of the base material. Further, the first joint resin may be an ultraviolet curable amine-based acrylic resin, and the ultraviolet curable urethane-acrylic resin may be a ternary copolymer, which is composed of tris(2-propenyloxyethyl)isocyanate, acetonitrile, (!-methyleneethyl)bis(4)·^phenyloxy-2 , - - Ethylene dimethylene oxide _2 Shan Yi Xuan two subunits) and the purpose of the gas - oxygen - _ hexyl phenyl ketone. According to another aspect of the present invention, a manufacturing method is provided for manufacturing a high-intensity light diffusing plate applied to a backlight module of a liquid crystal display, and the manufacturing method comprises preparing a light diffusing layer solution, which comprises The light-diffusing particle particle, the variation of the ** is more than 15%, and the coefficient of variation is calculated by the above formula), the solvent (specific gravity: 0.82 to gW:) & - the bonding resin 1 is applied to the light-diffusing layer solution For the stupid================================================================================================= "Resin. 'The beads and - the second is connected to the preparation of the component, the light-diffusing particles can be average particle size particles. 3 ##种不同1343870 [Embodiment] Hyun reference accompanying drawings in detail DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) The present invention has been described with respect to the preferred embodiments of the present invention. Should be regarded as a limited invention The scope and spirit of the present invention will be more clearly illustrated in the drawings, and thus in the drawings, the dimensions or thicknesses of various thin: or domains are exaggerated. The second drawing shows the application according to the present invention. A light-diffusing plate of the present invention has a bottom plate 210, and a light-diffusing layer 200 formed on the upper surface of the bottom plate 21 and laminated on the bottom plate 21〇. One of the lower surfaces is coated with a layer 220. The light diffusing layer 200 scatters or refracts light emitted by the LCD backlight module, thereby uniformly diffusing the light onto the entire surface of a screen. The composition of the light diffusion layer 2 includes a first resin, a hardener, a light diffusing particle, an antistatic agent, a dispersing agent, and a solvent. The solvent is the first bonding resin, the hardening. a material, the light-diffusing particle, the antistatic agent, and a material in which the dispersing agent is dissolved, so that the energy is particularly good. The t ^ mixture should have high dispersibility for the first bonding resin and the first diffusion particles.兮 scattered in the In a joining resin, in the manufacturing process of the board according to the present invention, the solvent should also prevent the light-expanding: particles; in the first joining resin of the 1J4387〇shai, that is, preventing the light-diffusing particles from being unhooked The ground material is dispersed in the first bonding resin. Therefore, the specific gravity of the solvent may be 〇82 to hOg/cm3. Preferably, the specific gravity of the solvent is 0.86 to i.〇g/cm3, and the point of the Buddha is 130 to 140 ° C.
當該溶劑之比重低於〇,82 g/cm3時,會降低該等光擴 散粒子之分散性,且在製造過程中,該等光擴散粒子將^ 此沈;殿於該溶劑中。因此必須再攪動該溶液。換句話戈, 當該溶劑之比重高於1.0 g/cm3時’該溶劑將變得比該第— 接合樹脂重,因而可能凝集於該第—接合樹脂之下,進而 乾燥後在該光擴散層200上出現污斑。含有乙醆丁酯及_ T本之混合溶液可作為 —*…以cnr之一讀 劑。然而,該溶劑並不限於該混合物’而是各種比重為〇 & 至l.〇g/cm3之材料均可作為該溶劑。較佳η, 疋以乙酸丁阁 1〇〇重量份為基準計算,其與20至150重量份之_ —When the specific gravity of the solvent is lower than 〇, 82 g/cm3, the dispersibility of the optically-dispersible particles is lowered, and during the manufacturing process, the light-diffusing particles are soaked; Therefore, the solution must be agitated again. In other words, when the specific gravity of the solvent is higher than 1.0 g/cm3, the solvent will become heavier than the first bonding resin, and thus may be aggregated under the first bonding resin, and then dried after the light is diffused. A stain appears on the layer 200. A mixed solution containing butyl ethoxide and _ T can be used as a reading agent for cnr. However, the solvent is not limited to the mixture', but various materials having a specific gravity of 〇 & to 1. 〇g/cm3 may be used as the solvent. Preferably, η, 疋 is calculated on the basis of 1 part by weight of acetic acid, and it is between 20 and 150 parts by weight.
混合。當二甲苯之含量高於20重量份時,會:少 液之表面張力,且於塗佈後發生液滴殘留。 一 乃 方面,嚕 二甲苯之含量低於150重量份時,因為二甲笨之、弗點相居mixing. When the content of xylene is more than 20 parts by weight, the surface tension of the liquid is small, and liquid droplets remain after application. On the other hand, when the content of xylene is less than 150 parts by weight, because the dimethyl stupidity
咼,因而無法順利執行乾燥製程。該殘留 ‘、’目H ,皮Λ、, 甲本也可斂 &成巧斑°再者,考慮到溶劑之沸點為〗30至ΐ4〇ΐ _ 使塗佈於底板2】〇之光擴散層200於乾燥過裎後展】二^ 異的整平性質。若溶劑之沸點低於13(TC,在該塗佈光掮 散層200獲得一期望之整平性質前,該溶劑可能蒸發。另 —方面’若溶劑之沸點高於M(rc,該底板210會捲曲, 因此須於乾燥過程中施加一荷重而造成一製程損失。 10 1343870 根據本發明,該等光擴散粒子之比重為1.0至1.2 g/cm3 且粒子尺寸之變異係數不超過15%。 該等光擴散粒子可包括壓克力基材的粒子,其由甲基 丙烯酸甲酯、甲基丙烯酸乙酯、曱基丙烯酸異丁酯、甲基 丙烯酸正丁酯、甲基曱基丙烯酸正丁酯、丙烯酸、甲基丙 烯酸、其共聚合物或其三元共聚合物所製成,烯烴基材粒 子,其由聚乙烯、聚苯乙烯或聚丙烯所製成,或如多層及 多成分粒子之有機粒子,其係形成一層壓克力及烯烴基材 ® 之共聚合物或同元聚合物粒子,且塗佈不同於該共聚合物 或同元聚合物層之單體而獲得。較佳是,該等光擴散粒子 ' 以聚曱基丙烯酸甲酯(PMMA)製成。再者,對該等光擴 • 散粒子而言,可使用折射率稍異於或等同於該第一接合樹 脂之粒子。 該變異係數係定義為一表式:「變異係數=(標準差+ 平均數)xlOO」。通常,該變異係數經常被用來表示離勢。 φ 在本發明中,係使用變異係數來取代會隨平均值變動之標 準差,變異係數能用於管理該等光擴散粒子之分布並將該 受管理分布應用於一所需的製程而不論其平均值為何。正 如上述之變異係數的定義,變異係數愈趨近於零,粒子間 的變異愈小。在本發明中,使用粒子尺寸之變異係數不超 過15%之光擴散粒子,以求極大化光擴散效果。亦即,當 該等光擴散粒子的變異係數超過15%時,於該光擴散層 200之初期塗佈過程中,即使雖然該光擴散層200之塗佈 厚度係等於該等光擴散粒子的平均粒徑,但由於該等光擴 1343*870 散粒子的顆粒尺寸分布廣,該等光擴散粒子係堆疊為多層 的形態而非一單層。因此,會減少光擴散效果。 該等光擴散粒子可為具有兩種不同平均粒徑之粒子。 在此實例中,具有較大的平均粒徑之粒子係塗佈一層於該 底板210之一表面,而具有較小的平均粒徑之粒子係填入 受該等塗佈之較大粒子所限定之間隙。此種結構可改良入 射於該底板210背面光線的擴散性。 例如,考慮到該等光擴散粒子包含兩種不同平均粒徑 ® 20//m及10//m之粒子,當兩種粒子之變異係數皆不大於 15%時,其晶粒尺寸分布便被縮小。因此,在此例中,當 ' 進入該底板210背面之光線被擴散時,可得到均勻定向的 • 光線。其結果,其係造成該光線之直線性,其係向前地行 進。這是因為藉由該等光擴散粒子之狹窄的平均粒徑分 布,使該等具有平均粒徑為20/zm之粒子得以一單層的形 態層疊,且將該等具有平均粒徑為l〇/zm粒子擠入該等層 φ 疊之大尺寸粒子。藉此,得以完成改善入射於該底板210 背面之光線的擴散性。 如上述,為了均勻地將小粒子分散於大粒子間的空 隙,除了調整該等粒子之晶粒尺寸分布外,必須增加該混 合溶液的固含量。較佳是,該混合溶液之固含量為3 8至 42%。當該混合溶液之固含量低於38%時,該混合溶液之 黏度將大幅減少。因此該塗佈光擴散層200難以獲得期望 的厚度均勻性,進而難以獲得期望的輝度均勻性。當該成 份中之固含量高於42%時,該成份之黏度將大幅增加。因 12 1343870 此,在完成塗佈製程後可能殘留液滴,並進而產生污斑。 在此,固含量係指該成份中除溶劑外之其他組成的百分比 〇 再者,較佳是’該等光擴散粒子具有比重1.0至l.2g/ cm 3。此限制係考慮與所用溶劑之比重的關係而決定。當該 等光擴散粒子之比重低於1.0 g/cm 3時,其可能低於所用溶 劑之比重,以致於該專光擴散粒子於溶劑中之分散性可能 下降。此時,亦難以控制該塗佈光擴散層200之厚度分布。 • 另一方面,當該等光擴散粒子之比重高於1.2 g/cm3時,該 等光擴散粒子於溶劑中之沈澱速度係非預期地增加。因 . 此,必須在塗佈製程中經常地再攪拌該溶劑,因而產生一 • 製程損失。 為了增加輻射至該光擴散板正面之光線的線性,且因 此,為了增加該光擴散板之輝度,較佳是將該等光擴散粒 子之折射率調整至與該第一接合樹脂相似。更佳是該等光 • 擴散粒子與該第一接合樹脂之折射率差值小於〇.〇1。當該 等光擴散粒子與該第一接合樹脂之折射率差值未大於0.01 時,可增加由該光擴散板正面射出之光線的輝度。 該第一接合樹脂具有一乾燥厚度,其對應於該等光擴 散粒子之平均粒徑之5G至75%。當該第—接合樹脂之乾 厚度低於料光擴散粒子之平均粒徑冑,將難以藉由 該第-接合樹脂固定地支撐該光擴散粒層。另一方面,當 該第-接合樹脂之乾厚度高於該等光擴散粒子之平均粒: 75%時,將減少光擴散效果。 c S ) 13 1343870 料光擴餘子之光線透料及擴散㈣與包含於該 第-接合樹脂之該等光擴散粒子含量有關。為了達到高光 線透過率及擴散率,以該第一接合樹脂1〇〇重量份為基準 計算,包含於該第一接合樹脂之該等光擴散粒子含量較佳 是4〇至」4〇重量份。當該等光擴散粒子含量低於仙重量 份時,藉由光線散射所產生的光擴散效果降低。另一方面 ,當該等光擴散粒子含量高於14◦重量份時,光線的透射 率降低。 • #該成份包含該第一接合樹脂時,係有益於光擴散層 2GG高度附著於該底板21G。再者,該第—接合樹脂應具有 與該等光擴散粒子相容的特性。 ' 使用壓克力樹脂作為該第一接合樹脂。較佳是,該壓 克力樹脂具有折射㈣為L49,以便該第—接合樹脂與該 等光擴散粒子間之折射率差值不大於〇.〇1。例如,考慮到 由PMMA製成之光擴散粒子,其具有與壓克力樹脂相同的 •折射率,亦即M9,由LCD背光模組射出,進入該光擴散 板之光線係直線地前進至LCD之整個螢幕表面,藉此改善 輝度。 為了增加該第一接合樹脂之性質,例如时熱性、对磨 耗性及附著性,可將硬化劑加入該光擴散層2〇〇之成份中 〇 該光擴散層200組成物中之分散劑係作為在該組成物 塗佈於底板210前’將該組成物維持在均勻的狀態。該分 散劑之種類並未限制。 14 1343870Oh, so the drying process cannot be performed smoothly. The residue ', 'H, skin Λ, 甲, can also be condensed & 成 斑 ° ° 再 再 再 再 再 再 再 再 再 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂 溶剂The layer 200 has a flattening property after drying and drying. If the boiling point of the solvent is lower than 13 (TC, the solvent may evaporate before the coating of the coating layer 200 to obtain a desired leveling property. Another aspect - if the boiling point of the solvent is higher than M (rc, the substrate 210 It will curl, so a load is applied during the drying process to cause a process loss. 10 1343870 According to the present invention, the light-diffusing particles have a specific gravity of 1.0 to 1.2 g/cm 3 and a coefficient of variation of particle size of not more than 15%. The iso-light-diffusing particles may comprise particles of an acrylic substrate consisting of methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, n-butyl methyl methacrylate. Made of acrylic acid, methacrylic acid, a copolymer thereof or a ternary copolymer thereof, olefin substrate particles made of polyethylene, polystyrene or polypropylene, or as multi-layer and multi-component particles An organic particle obtained by forming a copolymer or a homopolymer particle of a conjugated olefinic substrate and coated with a monomer different from the copolymer or the homopolymer layer. , the light diffusing particles Methyl acrylate (PMMA). Further, for the optically diffusing particles, particles having a refractive index slightly different or equivalent to the first bonding resin may be used. The coefficient of variation is defined as a table. Formula: "coefficient of variation = (standard deviation + average) xlOO". Usually, the coefficient of variation is often used to indicate the out-of-potential. φ In the present invention, the coefficient of variation is used to replace the standard deviation which varies with the mean value. The coefficient of variation can be used to manage the distribution of the light diffusing particles and apply the managed distribution to a desired process regardless of the average value. As defined by the coefficient of variation described above, the coefficient of variation is closer to zero, the particle In the present invention, light-diffusing particles having a particle size variation coefficient of not more than 15% are used in order to maximize the light diffusion effect, that is, when the coefficient of variation of the light-diffusing particles exceeds 15%. During the initial coating process of the light diffusion layer 200, even though the coating thickness of the light diffusion layer 200 is equal to the average particle diameter of the light diffusion particles, the particles of the light diffusion 1343*870 are dispersed. The size distribution is wide, and the light-diffusing particles are stacked in a multi-layered form rather than a single layer. Therefore, the light diffusion effect is reduced. The light-diffusing particles may be particles having two different average particle diameters. The particles having a larger average particle diameter are coated on one surface of the bottom plate 210, and the particles having a smaller average particle diameter are filled in the gap defined by the larger particles coated. The structure can improve the diffusivity of light incident on the back surface of the bottom plate 210. For example, considering that the light-diffusing particles contain two particles having different average particle diameters of ® 20//m and 10//m, when the two kinds of particles are varied When the coefficients are not more than 15%, the grain size distribution is reduced. Therefore, in this case, when the light entering the back surface of the substrate 210 is diffused, uniform light can be obtained. As a result, it causes the linearity of the light, which proceeds forward. This is because the particles having an average particle diameter of 20/zm are stacked in a single layer by the narrow average particle size distribution of the light-diffusing particles, and the average particle diameter is l〇. The /zm particles are squeezed into the large size particles of the layer φ stack. Thereby, the diffusibility of the light incident on the back surface of the bottom plate 210 is improved. As described above, in order to uniformly disperse small particles in the spaces between the large particles, in addition to adjusting the grain size distribution of the particles, it is necessary to increase the solid content of the mixed solution. Preferably, the mixed solution has a solid content of from 38 to 42%. When the solid content of the mixed solution is less than 38%, the viscosity of the mixed solution is greatly reduced. Therefore, it is difficult for the coated light-diffusing layer 200 to obtain a desired thickness uniformity, and it is difficult to obtain a desired luminance uniformity. When the solids content of the component is higher than 42%, the viscosity of the component will increase significantly. As a result of 12 1343870, droplets may remain after the coating process is completed, and stains may be generated. Here, the solid content means the percentage of the other components of the component excluding the solvent. Further, preferably, the light-diffusing particles have a specific gravity of 1.0 to 1.2 g/cm 3 . This limitation is determined by considering the relationship with the specific gravity of the solvent used. When the specific gravity of the light-diffusing particles is less than 1.0 g/cm 3 , it may be lower than the specific gravity of the solvent used, so that the dispersibility of the specific light-diffusing particles in the solvent may be lowered. At this time, it is also difficult to control the thickness distribution of the coated light diffusion layer 200. • On the other hand, when the specific gravity of the light-diffusing particles is higher than 1.2 g/cm3, the precipitation speed of the light-diffusing particles in the solvent is unexpectedly increased. As a result, the solvent must be re-mixed frequently during the coating process, resulting in a process loss. In order to increase the linearity of the light radiated to the front surface of the light diffusing plate, and therefore, in order to increase the luminance of the light diffusing plate, it is preferred to adjust the refractive index of the light diffusing particles to be similar to the first joining resin. More preferably, the refractive index difference between the light diffusing particles and the first bonding resin is less than 〇.〇1. When the difference in refractive index between the light-diffusing particles and the first bonding resin is not more than 0.01, the luminance of the light emitted from the front surface of the light-diffusing sheet can be increased. The first bonding resin has a dry thickness corresponding to 5G to 75% of the average particle diameter of the optically dispersed particles. When the dry thickness of the first bonding resin is lower than the average particle diameter 料 of the light-diffusing particles, it is difficult to fixedly support the light diffusion particle layer by the first bonding resin. On the other hand, when the dry thickness of the first-joining resin is higher than the average particle of the light-diffusing particles: 75%, the light-diffusing effect is reduced. c S ) 13 1343870 The light transmission and diffusion of the light-reinforcing expander (4) is related to the content of the light-diffusing particles contained in the first-bonding resin. In order to achieve high light transmittance and diffusivity, the content of the light-diffusing particles contained in the first bonding resin is preferably from 4 to 4 parts by weight based on 1 part by weight of the first bonding resin. . When the content of the light-diffusing particles is less than the weight of the cents, the light diffusing effect by light scattering is lowered. On the other hand, when the content of the light-diffusing particles is more than 14 parts by weight, the transmittance of light is lowered. • When the component contains the first bonding resin, it is advantageous for the light diffusion layer 2GG to be highly attached to the substrate 21G. Further, the first bonding resin should have characteristics compatible with the light-diffusing particles. 'Acrylic resin was used as the first bonding resin. Preferably, the acryl resin has a refractive index (iv) of L49 such that the refractive index difference between the first bonding resin and the light diffusing particles is not more than 〇.〇1. For example, considering light diffusing particles made of PMMA, which has the same refractive index as the acrylic resin, that is, M9, is emitted by the LCD backlight module, and the light entering the light diffusing plate is linearly advanced to the LCD. The entire screen surface is used to improve the brightness. In order to increase the properties of the first bonding resin, such as heat resistance, abrasion resistance and adhesion, a curing agent may be added to the component of the light diffusion layer 2, and the dispersing agent in the composition of the light diffusion layer 200 may be used as a dispersing agent. The composition is maintained in a uniform state before the composition is applied to the bottom plate 210. The type of dispersant is not limited. 14 1343870
之 本發明底板210係為一透明的支撐體。該底板/ 由選自聚醚颯(PES)、聚丙烯酸(pAR)、聚醚醯亞胺(p係 、聚一甲酸乙二醋(PEN )、聚對苯二甲酸乙二酉旨(pH丁) 聚本硫(PPS )、聚浠丙基、聚醯亞胺、聚碳酸酿(& ) 三醋酸纖維素(TAC)及醋酸丙酸纖維素(CAP)所矣 族群中之至少一種而製成。該底板210以PET製成為成 佳。該底板210必須對該第一接合樹脂具有優異的^ ^ 性,透過率不低於入射於該底板210背面光線的9〇%,寸著 均勻的表面光滑度不會造成輝度的偏差。較佳是,讀广且 21〇具有5〇至25〇//m之厚度。當該底板210之厚夜:杈 50/z m時,該底板210難以在製造過程中處理。另一方^ 當該底板210之厚度大於250/zm時,該底板21〇 *有 結構不符合最近LCD模組薄外觀的趨勢。 該背面塗佈層220係置於該底板210之下表面,談a 面塗佈層220包含摩擦係數不大於0 36 (MIU)之珠=背 及一張力彈性模數不大於30〇MPa之第二接合樹脂。 此處,MIU係指使用KES測得之摩擦係數(無單位) 之平均值,且不具有單位。因為該背面塗佈層220係與位 於該光擴散板背面之一元件(例如一導光板)相接觸,因 此在組裝導光板的過程中,在該背面塗佈層220與該導光 板間之界面上將不可避免地發生摩擦。此種摩擦會在該導 光板上產生到傷。通常地,該導光板係由壓克力樹脂製成, 其摩擦係數係介於〇.37至Q 38 (丽)⑶。據此,該等 珠粒之摩擦餘係不大於Q 36 (MIU),避免在該導光板上 15 I34J870 .產生刮傷。製造摩擦係數係*大於G.36 (MIU)之該等珠 •粒之材料,可舉例如甲基石夕氧烧粉末或耐論粉末(例如对 綸-I2) ’但不限於上述材料。甲基石夕氧院粉末或耐輪粉末 本質上具有彈性,藉以防止因與該導光板 該等珠粒。 』惕 如上述’摩擦係不可避免地發生於該背面塗佈層220 與該導光板間之界面。因此該第二接合樹脂之張力彈性模 鲁數其不大於300MPa,係小於層叠在一典型的導光板上之 壓克力樹脂之張力彈性模數,其為_爿譲嫩,可防 .止刮傷該背面塗佈層細。亦即,根據本發明,可同時防 止到傷該背面塗佈層220及該導光板。 „亥第一接合樹脂可由任何一種張力彈性模數不大於 300略之材料製成。例如,該第二接合樹脂可由一可紫外 線則匕之胺基甲酸醋_丙烯酸系樹脂製成,較佳是,由三(2_ 丙婦氧乙基)異氰酸尿醋_2丙烯酸、(1•亞甲基乙基)雙(仏 • t笨基氧:2,1-乙燒二亞基氧_2,1_乙烧二亞基)酯及1-氫氧- 環己基-苯基酉同所構成之三元共聚合物製成。該三元共聚合 物可為塊狀共聚合物或隨機共聚合物。該三元共聚合物具 有約52t之玻璃轉移溫度(Tg),且約4500之數-平均分 子量。 “月面塗佈層220提供一抗阻塞性質(anti-blocking property)予該光擴散板,藉以增加當組裝或再組裝該背光 模組時之可使用性。再者,該背面塗佈層220防止因與包 含光擴散粒子導光板摩擦所造成之刮傷,該導光板係使用 1343870 於-大尺寸螢幕LCD。此處,該抗阻塞性質係指—防止阻 塞的性質’而該阻塞係指整合該光擴散板與安置於鄰接該 光擴散板之-結構,例如該導光板。為了提供抗阻塞性質, 必須將該等珠粒由該背面塗佈層22G部份地突起並減少該 等珠粒之摩擦聽。較佳是,將該科粒自該f面塗佈^ 22〇突起3至5〃m。該等珠粒係減少該域散板與該導光 板間之接觸面積,藉以縮小該光紐板與料光板間之接 觸。The bottom plate 210 of the present invention is a transparent support. The bottom plate / is selected from the group consisting of polyether oxime (PES), polyacrylic acid (pAR), polyether sulfimine (p system, polyethylene terephthalate (PEN), polyethylene terephthalate (pH ding) Manufactured from at least one of polysulfonate (PPS), polydecyl propyl, polyethylenimine, polycarbonate (TAC), and cellulose acetate propionate (CAP) The bottom plate 210 is preferably made of PET. The bottom plate 210 must have excellent properties for the first bonding resin, and the transmittance is not less than 9〇% of the light incident on the back surface of the bottom plate 210, and is evenly spaced. The surface smoothness does not cause variations in luminance. Preferably, the readout is wide and the thickness of 21 〇 has a thickness of 5 〇 to 25 〇 / / m. When the thickness of the bottom plate 210 is 杈 50 / zm, the bottom plate 210 is difficult to Processing in the manufacturing process. When the thickness of the bottom plate 210 is greater than 250/zm, the structure of the bottom plate 21〇* does not conform to the trend of the recent appearance of the LCD module. The back coating layer 220 is placed on the bottom plate 210. The lower surface, the a-side coating layer 220 includes a bead having a coefficient of friction of not more than 0 36 (MIU) = a back and a force modulus of not more than 30 MPa. The second joining resin. Here, the MIU refers to an average value of the coefficient of friction (no unit) measured using KES, and has no unit because the back coating layer 220 is one element on the back surface of the light diffusing plate ( For example, a light guide plate is in contact with each other, so in the process of assembling the light guide plate, friction will inevitably occur at the interface between the back coating layer 220 and the light guide plate. Such friction will be generated on the light guide plate. Typically, the light guide plate is made of acrylic resin and has a coefficient of friction between 〇.37 and Q 38 (L) (3). Accordingly, the frictional residual of the beads is not greater than Q 36 ( MIU), to avoid scratching on the light guide plate 15 I34J870. The material with the coefficient of friction coefficient * is larger than G.36 (MIU), such as methyl oxysulfide powder or resistance theory The powder (for example, ply-I2) is 'but not limited to the above materials. The methyl oxalate powder or the anti-rotation powder is inherently elastic, thereby preventing the beads from being used with the light guide plate. Inevitably occurring between the back coating layer 220 and the light guide plate Therefore, the tensile modulus of the second bonding resin is not more than 300 MPa, which is less than the tensile elastic modulus of the acrylic resin laminated on a typical light guiding plate, which is _ 爿譲 tender and preventable. Scratching the back coating layer is fine. That is, according to the present invention, the back coating layer 220 and the light guiding plate can be simultaneously prevented from being damaged. The first bonding resin can be any tension modulus of not more than 300. For example, the second bonding resin may be made of an ultraviolet curable urethane-acrylic resin, preferably, tris(2-propyloxyethyl) isocyanate vinegar _ 2 acrylic acid, (1 methylene ethyl) bis (仏 • t styloxy oxygen: 2,1-ethane dimethylene oxide 2,1_ethylidene dimethylene) ester and 1-hydrogen oxygen-ring The hexyl-phenyl hydrazine is made of the ternary copolymer formed. The ternary copolymer can be a bulk copolymer or a random copolymer. The ternary copolymer has a glass transition temperature (Tg) of about 52 tons and an amount of about 4,500 - the average molecular weight. "The lunar coating layer 220 provides an anti-blocking property to the light diffusing plate to increase the usability when assembling or reassembling the backlight module. Further, the back coating layer 220 To prevent scratching caused by friction with a light diffusing plate containing light diffusing particles, the light guiding plate uses 1343870 for a large-size screen LCD. Here, the anti-blocking property refers to the property of preventing blocking, and the blocking refers to integration. The light diffusing plate is disposed adjacent to the structure of the light diffusing plate, such as the light guiding plate. In order to provide anti-blocking properties, the beads must be partially protruded from the back coating layer 22G and the beads are reduced. Preferably, the particles are coated from the f-face by a protrusion of 3 to 5 〃m. The beads reduce the contact area between the domain plate and the light guide plate, thereby reducing the contact area. Contact between the light board and the light board.
可藉由調整接合劑及粒子之一混合塗佈佈溶液中非揮The non-waxing in the coating solution can be mixed by adjusting one of the bonding agent and the particles
發性成份,而使該等珠粒自該背面塗佈層22〇表面突起。 亦即,一棒式塗佈機的數量係由該固含量決定。藉此,因 為該背面塗佈層220之厚度在乾燥前係為均勻,但是該接 二層之厚度被減少且該等粒子之晶粒大小在乾燥後並未改 交,因此該等珠粒能自該背面塗佈層22〇突起約3#m。 當該等珠粒自該背 面塗佈層220表面突起部分的厚产 低 3 / / J. At m 4 ’該背面塗佈層220與該導光板之阻塞便可 月匕發"4: 0 p 突起立另—方面’當該等珠粒自該背面塗佈層220表面 能發=分的厚度高於時,在該導光板上之刮傷便可 灰塵=@面塗佈層220可能在製造背光模組的過程中遭受 污$或不純物的污染。為了避免該背面塗佈層220之上述 靜讀背面塗佈層220可進〆少包含一抗靜電劑。該抗 的產^不限於—特定材料,但可採用任何在此技藝令常用 遂品。 17 1343870 第六圖係表示一液晶顯示器之背光模組之分解透視 圖,其係採用依據本發明之另一具體實施例之一光擴散 板。參考第六圖,一具有3層之多層光擴散板630係堆疊 於一使用冷陰極螢光燈管作為光源600之導光板620之發 光表面上。提供一反射板610於相對於導光板620之發光 表面之另一表面上。雖然依據本具體實施例之該多層光擴 散板630係表示為3層,但是該多層光擴散板630亦可為 2或4層。一習知的稜鏡板係增加光線的直線性,進而增 加該處的輝度,其價格昂貴,因此會增加製造成本。然而, 本發明之多層光擴散板,其中光擴散粒子層係相互重疊, 係增加光線的直線性進而增加該處的輝度同時降低製造成 本0 在下文中’將說明一種應用於液晶顯示器之背光模組 之高輝度光擴散板之製造方法,該製造方法係根據本發明 之一較佳具體實施例。 該方法包括: (S1)製備—光擴散層溶液,其包含粒子尺寸之變異 係數列表式表示)不超過15%之光擴散粒子,一第 接-树曰及比重為0.82至1.〇 g/cm3之一溶劑。 數二(標準差:平均數)xl〇0; 酯(PET) 光綠層溶液於—由料苯二甲酸| 氐板之一表面,且乾燥該施加的溶液; 18 1343870 (S3)形成包含具有摩擦係數不大於0.36 (MIU)之 珠粒之一背面塗佈層,及一形成於PET底板另一表面之第 二接合樹脂。於S1步驟中,該等光擴散粒子可含有兩種不 同平均粒徑之粒子。 於S1步驟中,當該溶劑之比重低於0.82 g/cm3時,該 等光擴散粒子於溶劑中之分散性將會降低,且在製造過程 中,該等光擴散粒子將因此沈澱於該溶劑中。據此,必須 再擾動該溶液。另一方面,當該溶劑之比重高於1.0 g/cm3 ® 時,該溶劑將變得比該第一接合樹脂重,因而可能於塗佈 後凝集於該第一接合樹脂之下。其結果,乾燥後可能出現 • 污斑。含有乙酸丁酯及二甲苯之一混合溶液可作為該溶 • 劑。然而,該溶劑並不限於該混合物,而是各種比重為0.82 至1.0 g/cm3之材料均可作為該溶劑。當該溶劑比重接近該 等光擴散粒子之比重時,在從溶解製程到塗佈製程之期間 内,該等光擴散粒子能均勻地分散於該溶劑中。在此情形 φ 下,據此,該等光擴散粒子沒有隨著時間增加而沈澱的問 題。當該等光擴散粒子隨著塗佈時間的經過而沈澱時,一 較小量之該等光擴散粒子係以一堆堆分布,其係其後產 生。其結果,雖然該散光值減少,但在該些堆間,其光擴 散效率減少。另一方面,一較大量之該等光擴散粒子係以 堆分布,其係較早產生,難以在每一堆中將該等光擴散粒 子安置於一單層内。更進一步地,一嚴重的散光值偏差將 局部地發生在該些堆間。 之後,將該等光擴散粒子滴入該溶劑中。在此,以使 19 1343870 其粒子尺寸之變異係數不超過15%之方式來調整該等光擴 散粒子之尺寸。可藉由各種過濾器來調整該等光擴散粒子 之尺寸,該等過遽器可由棉花、而ί绘、多孔性金屬、金属 纖維等製成。為了增加過濾效率,可使用一種方法來產生 橫越該過濾器之壓差,或使用離心分離的原理。進一步地, 可使用火棉膠膜或賽珞凡膜進行超過濾。具有與該等滴下 之光擴散粒子相異平均值之其他光擴散粒子或許可額外地 滴入該溶劑中。該等光擴散粒子之其他特徵係實質地相同 或相似於上述光擴散板之特徵,因此將在此省略其詳細的 敘述。 該第一接合樹脂溶解於該光擴散層溶液。該第一接合 樹脂必須與該底板210具有高度附著力,及與該等光擴散 粒子具有相容性。進一步,以該第一接合樹脂100重量份 為基準計算,該等光擴散粒子之含量係為40至140重量份 〇 未特別限制該第一接合樹脂之材料。較佳是,使用壓 克力樹脂作為該第一接合樹脂,其具有一幾乎近似ΡΜΜΑ 的折射率。 為了增加該第一接合樹脂之性質,例如耐熱性、耐磨 耗性及附著性,可將一硬化劑加入該光擴散層200之組成 中。 此後,為了製備一光擴散層溶液,其中該等光擴散粒 子係均勻地分散,可使用一習知之混合機。在此,以100 至300 rpm之條件將混合或分散製程執行1小時,以便將 20 1343870 該等光擴散粒子分散於溶液中,且接著以50至loo rpm之 條件將該溶液消泡約3〇分鐘。在上述之混合條件中,係施 加該混合速度來均勻地分散溶液中之光擴散粒子,並且有 效地將溶液消泡。當該混合速度過高時,溶液將產生大量 的氣泡。另一方面,當該混合速度過低時,將延長製造過 程所需的時間,進而減少該光擴散之產率。 此後’在步驟S2中,施加光擴散層溶液於由聚對苯二 甲酸乙二酯(PET )製成底板之一表面,並加以乾燥。 在此’底板係由PET製成,其具有高耐熱性及可加工 性。再者,該底板可由選自聚醚颯(PES)、聚丙烯酸(PAR)、 聚醚醯亞胺(PEI)、聚二甲酸乙二酯(pen)、聚對苯二曱酸 乙二酷(PET)、聚苯硫(ppS)、聚烯丙基、聚醯亞胺、聚碳 酸酯(PC)、三醋酸纖維素(TAC)及醋酸丙酸纖維素(CAp)所 組成族群中之一種而製成,只要該上述材料具有高耐熱性 及可加工性。 該PET底板具有50至250// m之厚度。該底板之其他 特徵係如上述,因此將在此省略詳細的敘述。 此後’該光擴散層溶液係塗佈於該PET底板上。在此 了採用各種塗佈方法,例如旋轉塗佈法、網版遮革塗佈 法及棒塗佈法。較佳是使用棒塗佈法,因其適合大量生產 及連續生產。使用該棒塗佈法’該光擴散層溶液能塗佈一 約20//m之厚度於該PET底板上。此後,乾燥該ρΕτ底 板及塗佈於其上之該光擴散層溶液。在此,可藉由單獨或 結合的方式採用各種乾燥方法,例如熱風乾燥法、紅外線 21 1343870 乾燥法及紫外線乾燥法。在上述的乾燥製程後,該塗佈之 光擴散層溶液巾,溶㈣份揮發,H以形成—光擴散層。 最後,在步驟S3中,包含具有摩擦係數不大於〇36 (圃)之珠粒H塗佈層,及該第二接合樹脂係形成 於PET底板之另一表面。 藉由摩擦係數不大於〇.36 (MIU),該等珠粒能具有_ 抗阻塞性質,且能避免因該導光板與位於光擴散板背面之 -疋件(例如—導光板)發生摩擦而在該導光板上產生刮 傷。該等珠粒之其他特徵係如上述,因此將在此省略詳細 的敛述。 該等珠粒之摩擦係數越低’該等珠粒越有益。較佳是, 該等珠粒之摩擦係數不大於〇 36 (_)。例如,該 :由摩擦係數不大於〇.36 (刚)之材料製成,例如 =氧烧粉末或耐給粉末(例如耐給_12),但不限於上述 。:(:V:e 板及===;樹;-起溶解’將該等珠 料,但可使用此領域中常用不限於一特定材 對第二接合樹“it如曱基乙基敝甲苯。 耐刮傷性及張力彈性桓數可使用任何具有—抗阻塞性、 接合樹脂可為-可紫^不大於3_a之材料。該第二 脂,且該可紫外線固化;固化之胺基m丙稀酸系樹 元共聚合物,該三元共=甲酸以旨·丙烯酸樹脂可為一三 、♦ 5物係由二(2-丙烯氧乙基)異氰醆 22 1343870 尿酉旨-2丙坤酸、(1-亞甲基乙基)雙(4,1-伸苯基氧-2,1-乙烧·一 亞基氧-2,1-乙烧二亞基)自旨及1-風氧-ί哀己基-本基國所構 成。 再者,可添加一抗靜電劑於該溶劑中。該抗靜電劑不 限於一特定材料,但可採用此領域中常用的產品。 此後,為了形成該背面塗佈層,含有該等珠粒及該第 二接合樹脂之溶劑應加於一混合製程。該混合製程可藉由 採用與步驟S1所採用之混合光擴散層溶液相同的混合方 法來執行。 此後,均勻地混合該等珠粒及該第二接合樹脂之溶劑 係塗佈於步驟S2形成該PET底板之另一表面,且予以乾 燥。採用與步驟S1中乾燥光擴散層溶液相同的方法來乾燥 該溶劑。 在下述中,茲參照以下之實施例更詳細地說明本發 明。然而,此等實施例之敘述不應視做限制本發明。 實施例1 製備一光擴散層溶液,係藉由將折射率為1.49之壓克 力樹脂l〇〇g、作為一硬化劑之聚異氰酸酯5g及由聚曱基 丙烯酸曱酯製成之粒子75g (PMMA係由日本綜研化學暨 工程股份有限公司製造,其係作為光擴散粒子且折射率為 1.49,比重為1.19g/cm3,尺寸為20//m,粒子尺寸變異係 數為7% ),混合於含有乙酸丁酯112g及二曱苯48g之一 溶劑中(該溶劑比重為0.878 g/cm3且沸點為133.29°C ), 23 ^343870 =製備一混合溶液,使用—均質混合機對該混合溶液施加 、、jOOOrpm且歷時1小時之分散製程,再將該混合溶液消 泡'力2小時。藉由使用—棒式塗佈機將該光擴散層溶液施 =於二具有厚度125/zmPET底板之-表面,接著加以乾 燥/藉此,獲得具有厚度20am該光擴散層之一 pET板。 1後’製備-背面塗佈層溶液,係藉由將可紫外線固化之 土甲酉文S曰-丙稀酸系樹脂l〇〇g (Nat〇k〇塗料股份有限公 %司氣造,”SB_243”,其玻璃轉移溫度約為52。(:且一張力彈 數為25〇MPa)、作為抗靜電劑之非離子界面活性劑& , 及由甲基矽氧烷製成具有摩擦係數為〇‘32 (MIU)之珠粒 .2g,溶解於一含有曱苯50g及曱基乙基酮5〇g之一混合溶 液。使用棒式塗佈機將該背面塗佈層溶液塗佈於具備該光 擴散層該PET板之另一表面,接著於溫度1〇〇〇c.風烘箱 中乾燥30秒。接下來,藉由具有輻射強度6〇〇mJ/cm2之紫 外線硬化該PET板上之塗佈。藉此,製造具有含一厚度4 • 突出珠粒該背面塗佈層之光擴散板。 實施你| 2 製備一光擴散層溶液,係藉由將將折射率為149之不 飽和聚酯樹脂100g、作為硬化劑之聚異氰酸酯5g及由聚 甲基丙烯酸曱酯製成之粒子75g (PMMA係由日本綜研化 學暨工程股份有限公司製造,其係作為光擴散粒子且折射 率為1.49’比重S 1.19gW’尺寸為1Q//m,粒子尺寸變 異係數為7% ),混合於含有乙酸丁酯65g及二甲苯16g之 24 1343870 一溶劑中(該溶劑比重為〇.879g/cm3且沸點為131.86°C ), 以製備一混合溶液,使用一均質混合機對該混合溶液施加 一 lOOOrpm且歷時1小時之分散製程,再將該混合溶液消 泡約2小時。藉由使用一棒式塗佈機將該光擴散層溶液施 加於一具有厚度125// mPET底板之一表面,接著加以乾 燥。藉此,獲得具有厚度20//m該光擴散層之一 PET板。 其後,製備一背面塗佈層溶液,係藉由將可紫外線固化之 胺基甲酸酯丙烯酸系樹脂1⑽g ( Natoko塗料股份有限公 司製造,’’SB-243”且一張力彈性模數為25〇Mpa)、作為抗 靜電劑之非離子界面活性劑5g及由耐論_12製成具有摩擦 係數為0.34 (MIU)之珠粒2g,溶解於一含有甲苯5 甲基乙基酮5如之一混合溶液。使用棒式塗佈機將該背面 塗佈層溶液塗佈於具備該光擴散層該m板之另一表面, 接著於溫度HKTC熱風烘箱中乾燥3()秒。接下來,藉Μ 有輕射強度60GmI/c^之紫外線硬化該ρΕτ板上之塗佈: 籲藉此’製造具有含-厚度突出珠粒該背面塗佈層之光 擴散板。 實施例3 採用與實施例1相同的方法來製造-光擴散板,除了 使用一含有乙酸丁_ ·及二甲笨吨之-溶劑(該溶劑 比重為0.876 g/cm3且彿點為134,7。〇來製備—混合溶液 25 1343870 f施例4 製備一光擴散層溶液,係藉由將折射率為149之壓克 力樹脂l〇〇g、作為硬化劑之聚異氰酸酯5g、由聚甲基丙烯 酸甲酯製成之粒子126g ( PMMA係由日本綜研化學暨工程 股份有限公司製造1其折射率為1,49,比重為i,19g/cm3,The hair components are caused to protrude from the surface of the back coating layer 22 . That is, the number of a bar coater is determined by the solid content. Thereby, since the thickness of the back coating layer 220 is uniform before drying, the thickness of the second layer is reduced and the grain size of the particles is not changed after drying, so the beads can The protrusion from the back coating layer 22 is about 3 #m. When the beads are raised from the surface of the back coating layer 220, the thickness of the protrusion is lower than 3 / / J. At m 4 'the back coating layer 220 and the light guide plate can be blocked. "4: 0 When the thickness of the surface of the back coating layer 220 is higher than the thickness of the surface of the back coating layer 220, the scratch on the light guiding plate may be dust = @面 coating layer 220 may be In the process of manufacturing the backlight module, it is contaminated by dirt or impurities. In order to avoid the above-mentioned static reading back coating layer 220 of the back coating layer 220, an antistatic agent may be contained. The production of this resistance is not limited to a specific material, but any of the commonly used products in this art can be used. 17 1343870 Fig. 6 is an exploded perspective view showing a backlight module of a liquid crystal display, which is a light diffusing plate according to another embodiment of the present invention. Referring to the sixth drawing, a multi-layer light diffusing plate 630 having three layers is stacked on a light-emitting surface of a light guiding plate 620 using a cold cathode fluorescent lamp as the light source 600. A reflecting plate 610 is provided on the other surface of the light emitting surface relative to the light guiding plate 620. Although the multilayer light diffusion plate 630 is represented by three layers in accordance with the present embodiment, the multilayer light diffusion plate 630 may also be two or four layers. A conventional seesaw increases the linearity of the light, which in turn increases the brightness of the place, which is expensive and therefore increases manufacturing costs. However, the multilayer light diffusing plate of the present invention in which the light diffusing particle layers overlap each other increases the linearity of the light and thereby increases the luminance at the same time and reduces the manufacturing cost. 0 Hereinafter, a backlight module applied to the liquid crystal display will be described. A method of manufacturing a high-intensity light diffusing plate according to a preferred embodiment of the present invention. The method comprises: (S1) preparing a light diffusion layer solution comprising a coefficient of variation of a particle size as a list of light diffusing particles of no more than 15%, a first-tree stalk and a specific gravity of 0.82 to 1. 〇g/ One of the solvents of cm3. Number two (standard deviation: average) xl 〇 0; ester (PET) light green layer solution on the surface of one of the phthalic acid silicate plates, and drying the applied solution; 18 1343870 (S3) formation contains A back coating layer having a coefficient of friction of not more than 0.36 (MIU) and a second bonding resin formed on the other surface of the PET substrate. In the step S1, the light-diffusing particles may contain two particles of different average particle diameters. In the step S1, when the specific gravity of the solvent is less than 0.82 g/cm3, the dispersibility of the light-diffusing particles in the solvent will be lowered, and the light-diffusing particles will precipitate in the solvent during the manufacturing process. in. Accordingly, the solution must be disturbed again. On the other hand, when the specific gravity of the solvent is higher than 1.0 g/cm3 ® , the solvent will become heavier than the first bonding resin, and thus may be aggregated under the first bonding resin after coating. As a result, stains may appear after drying. A mixed solution containing one of butyl acetate and xylene can be used as the solvent. However, the solvent is not limited to the mixture, but various materials having a specific gravity of 0.82 to 1.0 g/cm3 may be used as the solvent. When the specific gravity of the solvent is close to the specific gravity of the light-diffusing particles, the light-diffusing particles can be uniformly dispersed in the solvent during the period from the dissolution process to the coating process. In this case φ, according to this, the light-diffusing particles do not precipitate as time increases. When the light-diffusing particles are precipitated as the coating time elapses, a smaller amount of the light-diffusing particles are distributed in a pile which is subsequently produced. As a result, although the astigmatism value is reduced, the light diffusion efficiency is reduced between the stacks. On the other hand, a relatively large amount of the light-diffusing particles are distributed in a stack which is generated earlier, and it is difficult to arrange the light-diffusing particles in a single layer in each stack. Further, a severe astigmatism deviation will occur locally between the stacks. Thereafter, the light-diffusing particles are dropped into the solvent. Here, the size of the light-diffusing particles is adjusted so that the coefficient of variation of the particle size of 19 1343870 does not exceed 15%. The size of the light-diffusing particles can be adjusted by various filters which can be made of cotton, embossed, porous metal, metal fiber or the like. In order to increase the filtration efficiency, a method can be used to generate a pressure difference across the filter, or to use a centrifugal separation principle. Further, ultrafiltration can be carried out using a sponge film or a cellophane film. Other light-diffusing particles having a different average value from the dropped light-diffusing particles may be additionally dropped into the solvent. Other features of the light-diffusing particles are substantially the same or similar to those of the above-described light diffusing plate, and thus detailed description thereof will be omitted herein. The first bonding resin is dissolved in the light diffusion layer solution. The first bonding resin must have a high adhesion to the substrate 210 and compatibility with the light-diffusing particles. Further, the content of the light-diffusing particles is 40 to 140 parts by weight based on 100 parts by weight of the first bonding resin. The material of the first bonding resin is not particularly limited. Preferably, a acryl resin is used as the first bonding resin, which has a refractive index which is almost similar to ΡΜΜΑ. In order to increase the properties of the first bonding resin, such as heat resistance, abrasion resistance and adhesion, a hardener may be added to the composition of the light diffusion layer 200. Thereafter, in order to prepare a light diffusion layer solution in which the light diffusion particles are uniformly dispersed, a conventional mixer can be used. Here, the mixing or dispersion process is performed for 1 hour at 100 to 300 rpm to disperse 20 1343870 of the light-diffusing particles in a solution, and then the solution is defoamed by about 3 Torr at 50 to loo rpm. minute. In the above mixing conditions, the mixing speed is applied to uniformly disperse the light-diffusing particles in the solution, and the solution is effectively defoamed. When the mixing speed is too high, the solution will generate a large amount of bubbles. On the other hand, when the mixing speed is too low, the time required for the manufacturing process is prolonged, thereby reducing the yield of the light diffusion. Thereafter, in step S2, a light diffusion layer solution is applied to the surface of one of the base plates made of polyethylene terephthalate (PET), and dried. Here, the bottom plate is made of PET, which has high heat resistance and workability. Furthermore, the bottom plate may be selected from the group consisting of polyether oxime (PES), polyacrylic acid (PAR), polyether phthalimide (PEI), polyethylene dicarboxylate (pen), and polyethylene terephthalate. PET), polyphenylene sulfide (ppS), polyallyl, polyimine, polycarbonate (PC), cellulose triacetate (TAC) and cellulose acetate propionate (CAp) It is produced as long as the above materials have high heat resistance and workability. The PET substrate has a thickness of 50 to 250 / / m. Other features of the bottom plate are as described above, and thus detailed descriptions thereof will be omitted herein. Thereafter, the light diffusion layer solution was applied to the PET substrate. Here, various coating methods such as a spin coating method, a screen coating method, and a bar coating method are employed. It is preferred to use a bar coating method because it is suitable for mass production and continuous production. Using the bar coating method, the light diffusion layer solution can be applied to a thickness of about 20/m on the PET substrate. Thereafter, the ρΕτ substrate and the light diffusion layer solution coated thereon are dried. Here, various drying methods such as hot air drying, infrared 21 1343870 drying, and ultraviolet drying may be employed by separate or combined means. After the above drying process, the coated light-diffusing layer solution towel is dissolved in four (4) portions to form a light-diffusing layer. Finally, in step S3, a bead H coating layer having a coefficient of friction of not more than 〇36 (圃) is included, and the second bonding resin is formed on the other surface of the PET substrate. By having a coefficient of friction of not more than 〇.36 (MIU), the beads can have _ anti-blocking properties and can avoid friction between the light guide plate and a member (eg, a light guide plate) located on the back side of the light diffusing plate. A scratch is generated on the light guide plate. Other features of the beads are as described above, and thus detailed descriptions thereof will be omitted herein. The lower the coefficient of friction of the beads, the more beneficial the beads are. Preferably, the beads have a coefficient of friction no greater than 〇 36 (_). For example, it is made of a material having a coefficient of friction of not more than 〇.36 (just), such as = oxygen-fired powder or resistant powder (for example, resistance to _12), but is not limited to the above. :(:V:e plate and ===; tree; - dissolves the beads, but can be used in this field is not limited to a specific material to the second joint tree "it such as thiol ethyl fluorene toluene The scratch resistance and the tensile elastic modulus may be any material having - anti-blocking property, the bonding resin may be - violet, and not more than 3_a. The second grease, and the ultraviolet curable; the cured amino group Dilute acid tree-based copolymer, the ternary total = formic acid, acrylic resin can be one or three, ♦ 5 systems from bis(2-propoxyethyl) isocyanide 22 1343870 Quinic acid, (1-methyleneethyl) bis(4,1-phenylene oxide-2,1-ethane-sinter-monooxy-2,1-ethenediethylene) In the solvent, the antistatic agent may be added to the solvent. The antistatic agent is not limited to a specific material, but a product commonly used in the field may be used. Forming the back coating layer, the solvent containing the beads and the second bonding resin should be added to a mixing process. The mixing process can be carried out by using the mixed light diffusion layer solution used in step S1. The same mixing method is carried out. Thereafter, the solvent is uniformly mixed and the solvent of the second bonding resin is applied to the other surface of the PET substrate to be dried in step S2, and dried in the same manner as in step S1. The solvent is dried in the same manner as the diffusion layer solution. In the following, the invention will be described in more detail with reference to the following examples. However, the description of the examples should not be construed as limiting the invention. The diffusion layer solution is obtained by using an acrylic resin having a refractive index of 1.49, a polyisocyanate 5 g as a hardener, and a particle of 75 g made of polydecyl decyl acrylate (PMMA by Japan Institute of Chemistry) Manufactured by JI Engineering Co., Ltd. as a light-diffusing particle with a refractive index of 1.49, a specific gravity of 1.19 g/cm3, a size of 20//m, a particle size coefficient of variation of 7%), mixed with 112 g of butyl acetate and In a solvent of 48 g of diphenylbenzene (the specific gravity of the solvent is 0.878 g/cm3 and the boiling point is 133.29 ° C), 23 ^ 343870 = preparing a mixed solution, using a homomixer to apply the mixed solution, jOOOO rpm and calendar After 1 hour of dispersion, the mixed solution was defoamed for 2 hours. The light diffusion layer solution was applied to a surface having a thickness of 125/zm PET substrate by using a bar coater, followed by drying. / Thereby, a pET plate having a thickness of 20am of the light diffusion layer is obtained. 1 After the 'preparation-back coating layer solution, by UV-curable soil, the scorpion S-acrylic resin l〇 〇g (Nat〇k〇 Coatings Co., Ltd., SB_243), its glass transition temperature is about 52. (: and a force bomb is 25 MPa), non-ionic interface activity as an antistatic agent And <, and a bead made of methyl decane having a coefficient of friction of 〇'32 (MIU), 2 g, dissolved in a mixed solution containing 50 g of anthraquinone and 5 〇g of mercaptoethyl ketone. This back coating layer solution was applied onto the other surface of the PET sheet provided with the light diffusion layer using a bar coater, followed by drying at a temperature of 1 °c. in an air oven for 30 seconds. Next, the coating on the PET plate was hardened by ultraviolet rays having a radiation intensity of 6 〇〇 mJ/cm 2 . Thereby, a light diffusing plate having the back coating layer having a thickness of 4 • protruding beads was produced. Implementing You | 2 Preparing a light diffusion layer solution by using 100 g of unsaturated polyester resin having a refractive index of 149, 5 g of polyisocyanate as a hardener, and 75 g of PM made of polymethyl methacrylate (PMMA) It is manufactured by Japan Institute of Chemical Engineering and Engineering Co., Ltd. as a light diffusing particle with a refractive index of 1.49' specific gravity S 1.19gW' size of 1Q//m, particle size coefficient of variation of 7%), mixed with butyl acetate. 65g of ester 65g and 16g of xylene, a solvent (the specific gravity of the solvent is 879.879g/cm3 and a boiling point of 131.86 ° C) to prepare a mixed solution, and a homomixer is used to apply a 1000 rpm to the mixed solution for a period of time. The mixed solution was defoamed for about 2 hours in a 1 hour dispersion process. The light diffusion layer solution was applied to a surface of a substrate having a thickness of 125 m/m by using a bar coater, followed by drying. Thereby, a PET plate having a thickness of 20 / / m of the light diffusion layer was obtained. Thereafter, a back coating layer solution was prepared by using UV curable urethane acrylic resin 1 (10) g (manufactured by Natoko Paint Co., Ltd., ''SB-243') and a force elastic modulus of 25 〇Mpa), 5g of nonionic surfactant as antistatic agent and 2g of beads with a coefficient of friction of 0.34 (MIU) made from 耐__12, dissolved in a toluene 5 methyl ethyl ketone 5 A mixed solution was applied to the other surface of the m-plate provided with the light-diffusing layer using a bar coater, followed by drying in a temperature HKTC hot air oven for 3 () seconds.紫外线 UV-curing with a light-intensity intensity of 60 GmI/c^ is applied to the ρΕτ plate: This is used to manufacture a light-diffusing sheet having the back-coated layer with a thickness-containing bead. Example 3 Adoption and Example 1 The same method was used to fabricate a light diffusing plate, except that a solvent containing butyl acetate and dimethyl benzene was used (the solvent specific gravity was 0.876 g/cm3 and the point of the buddha was 134,7. 1343870 f Example 4 Preparation of a light diffusion layer solution by refractive index 149 acryl resin l〇〇g, polyisocyanate 5g as hardener, 126g made of polymethyl methacrylate (PMMA is manufactured by Japan Institute of Chemical Engineering and Engineering Co., Ltd.) , 49, specific gravity is i, 19g/cm3,
尺寸為20//m,粒子尺寸變異係數為7% )及由聚甲基丙 婦酸甲自曰製成之粒子14g ( PMMA係由日本綜研化學學工 程股份有限公司製造,其折射率為U9,比重為ία g/cm3,尺寸為10/zm,粒子尺寸變異係數為9 5% ),混合 於含有乙酸丁酯】6 2 g及二甲笨6 9 g之一溶劑中(該溶劑比 重為0.878 g/cm3且沸點為133.29t),以製備一混合溶液, 使用一均質混合機對該混合溶液施加一 1〇〇〇rpm且歷時1 小時之分散製程,再將該混合溶液消泡約2小時。藉由使 用一棒式塗佈機將該光擴散層溶液施加於一具有厚度125 #mPET底板之一表面,接著加以乾燥。藉此,獲得具有 厚度20/z m該光擴散層之一 PE丁才反。其後,製備一背面塗 佈層溶液,係藉由將可紫外_化之胺基甲動旨丙彿酸系 樹脂100g (Natoko塗料股份有限公司製造,”sb_243”,並 溫度約為饥且—張力彈性模數為雇pa)、; 具有摩擦係㈣0.32 (MIU ^=由甲切氧炫製成 笨扣…旦… g,溶解於-含有曱 牌讀背土酮,之—混合溶夜。使用棒式塗佈機 Γ塗佈於具備該料散層該啦板之另 度戰熱風棋箱中乾燥3〇秒。接下來, 26 1343870 藉由具有輻射強度600mJ/cm2之紫外線硬化該PET板上之 塗佈。藉此’製造具有含一厚度4/zm突出珠粒該背面塗佈 層之光擴散板。 fe較實施例1The particle size is 20//m, the particle size variation coefficient is 7%) and the particle 14g made of polymethyl ketone ethyl phthalate is manufactured by Japan Institute of Chemical Engineering Co., Ltd., and its refractive index is U9. , the specific gravity is ία g / cm3, the size is 10 / zm, the particle size coefficient of variation is 9 5%), mixed in a solvent containing butyl acetate] 6 2 g and dimethyl stupid 6 9 g (the specific gravity of the solvent is 0.878 g/cm3 and a boiling point of 133.29t) to prepare a mixed solution, using a homomixer to apply a dispersion process of 1 rpm and 1 hour to the mixed solution, and then defoaming the mixed solution by about 2 hour. The light diffusion layer solution was applied to a surface having a thickness of 125 #mPET by using a bar coater, followed by drying. Thereby, one of the light diffusion layers having a thickness of 20/z m is obtained. Thereafter, a back coating layer solution was prepared by using a UV-based amine-based methyl propylene resin 100 g (manufactured by Natoko Paint Co., Ltd., "sb_243", and the temperature was about hunger - Tensile elastic modulus is hired pa), with friction system (four) 0.32 (MIU ^= made of cut-to-oxygen sinusoidal deduction... Dan... g, dissolved in - containing 曱 brand read doxy ketone, which - mixed night Applying a bar coater to the other hot air box with the material layer to dry for 3 seconds. Next, 26 1343870 hardens the PET by ultraviolet light having a radiation intensity of 600 mJ/cm 2 . Coating on the board. By this, a light diffusing plate having a back coating layer having a thickness of 4/zm protruding beads was fabricated.
製備一光擴散層溶液,係藉由將折射率為1.47之可紫 外線固化之胺基曱酸酯-丙烯酸系樹脂l〇〇g及由聚甲基丙 烯酸曱酯製成之粒子75g ( PMMA係由日本積水塑膠股份 有限公司製造,其係作為光擴散粒子且折射率為149,尺 寸為20/zrn,粒子尺寸變異係數為35% ),混合於甲基乙 基酮(MEK) 128g之一溶劑中(該溶劑比重為〇.8〇2g/cm3 且沸點為79.6C )’以製備一混合溶液,使用一均質混合機 對該混合溶液施加一 l〇〇〇rpm且歷時丨小時之分散製程, 再將該混合溶液消泡約2小時。藉由使用一棒式塗佈機, 將該光擴散層溶液施加於一具有厚度125//mPET底板之 一表面,接著加以乾燥。藉此,獲得具有厚度2〇#讯之該 光擴散層之-PET板。其後’製備―背面塗佈層溶液,係 藉由將熱固性壓克力接合樹脂〗,(韓_ aekyung CHEMICAL製造,其玻璃轉移溫度約為⑽艺)、作為抗靜 電劑之非離子界面活性劑3g及由PMMA製成具有摩:係 數為0.38 ( MIU)之珠粒2g ’溶解於甲笨心中。使用棒 式塗佈機將該背面塗佈層溶液塗佈於具備該光擴散層該 PET板之另一表面,接著於溫度_熱風料中^“ 秒。藉此’製造具有含-厚度突出珠粒該背面塗佈層 27 1343870 之光擴散板。 測試實施例1 • 上述實施例1到4及比較實施例1之該些光擴散板係 藉由下列方法加以評估。 (1)耐刮傷性 經由與一導光板之摩擦測試來觀察在該光 擴散板上之刮傷。在此,使用日本新東科學股份 ® 有限公司製之表面性質測試 機”HEIDON-14DR”。該測試條件係將往復速度 設定為4500 _/min,往復距離設定為15 mm,往 ' 復次數設定為2000,且施加50g重量。以肉眼 的檢查做為評估的結果。 第三a圖係表示一依據比較實施例1製成之 光擴散板經摩擦試驗後之表面狀態之照片,且第 φ 三b圖係表示一依據本發明之實施例4製成之光 擴散板,經摩擦試驗後之表面狀態之照片。參考 第三a圖及第三b圖,當該光擴散板與該導光板 相接觸時,因為該些珠粒之摩擦係數小,可看出 很少數的刮傷形成於本發明之光擴散板上。亦可 看出藉由該第二接合樹脂之彈性而確保一允許 該些珠粒移動之距離,藉此減少刮傷的損害。 ^ (2)耐磨耗評估 使用一整耗機(taber abraser、使用一磨耗 28 1343870 輪CS-17及一荷重ikg )用來測量由實施例4及 比較實施例1製成之每一光擴散板之背面塗佈 層之耐磨耗性’將每一光擴散板製備為碟狀試驗 片。將磨耗輪安裝於該試驗片上,再將其轉動。 藉以磨耗該試驗片。接下來,測量該磨耗的試驗 片之重量。第五圖係表示該些光擴散板之所得的 測試結果。 第五圖係表示一該光擴散板之耐磨耗測試 結果之圖表,該些光擴散板係依據本發明之實施 例4及比較實施例1製成。參考第五圖,依比較 實施例1製成之光擴散板之試驗片之減少量,係 正比於磨耗輪之每分鐘轉數(rpm)之增加。另 一方面,依本發明之實施例4製成之光擴散板之 試驗片’其減少量係接近於零直到磨耗輪之每分 鐘轉數達到約300 rpm,且自那時起至磨耗輪之 每分鐘轉數達1000 rpm止’該減少量仍維持為 一低值。進一步地,依據肉眼的檢查,依比較實 施例1製成之光擴散板之第二接合樹脂剝落。另 一方面,依實施例4製成之光擴散板之試驗片之 第二接合樹脂之任一部份未剝落。因此,可察知 本發明之光擴散板具有優異的耐磨耗性。 (3)輝度評估 使用一稱為BM7之裝置(Topcon公司製 造),且測量角係為1度。測量一光擴散板之全 29 1343870 部9個區域。將該些9個測量區域予以編號。第 四圖係表示一依據本發明之另一具體實施例之 光擴散板之輝度測量區域的示意圖。表1係陳述 使用上述裝置在每一光擴散板之9個區域測得 之輝度’該些光擴散板係依據實施例1到4及比 較實施例1製成。 表1 1 2 3 4 5 6 7 8 9 平均 輝庳 增加率 (% ) 實 施 例 1 3737 3246 3293 3258 3521 3425 3178 3206 3078 3327 1.2 實 施 例 2 3713 3218 3265 3238 3509 3389 3154 3178 3086 3306 0.5 實 施 例 3 3792 3281 3325 3313 3569 3433 3214 3262 3142 3370 2.5 實 施 例 4 3836 3309 3345 3317 3593 3485 3269 3305 3178 3404 3.5 比 較 實 施 例 1 3689 3198 3242 3214 3493 3401 3126 3166 3066 3288 0.0 如表1所示,測量依比較實施例1製成光擴散板之1 30 1343870 到9區域之輝度,並且計算其平均輝度。接著,計算依實 施例1到4製成每一光擴散板之平均輝度,並且與依比較 實施例1製成光擴散板之平均輝度相比較。藉此,計算依 實施例1到4製成每一光擴散板之平均輝度之增加率。亦 即,依比較實施例1製成光擴散板之平均輝度係作為一參 考輝度。參考表1可知,依實施例1到4製成光擴散板之 平均輝度增加率各為1.2%、0.5%、2.5%及3.5%。A light diffusion layer solution is prepared by using a UV-curable amino phthalate-acrylic resin l〇〇g having a refractive index of 1.47 and a particle of 75 g made of polymethyl methacrylate (PMMA system) Manufactured by Japan Sekisui Plastics Co., Ltd. as a light-diffusing particle with a refractive index of 149, a size of 20/zrn and a particle size coefficient of variation of 35%), mixed with a solvent of methyl ethyl ketone (MEK) 128g. (the solvent has a specific gravity of 〇8〇2g/cm3 and a boiling point of 79.6C) to prepare a mixed solution, and a homogenizer is used to apply a dispersion process of the mixture to a rpm and a lapse of several hours. The mixed solution was defoamed for about 2 hours. The light diffusion layer solution was applied to a surface having a thickness of 125 / / m PET substrate by using a bar coater, followed by drying. Thereby, a PET plate having the thickness of the light diffusion layer was obtained. Thereafter, the 'preparation-back coating layer solution is a non-ionic surfactant which is an antistatic agent by using a thermosetting acrylic bonding resin, (manufactured by Han _ aekyung CHEMICAL, whose glass transition temperature is about (10) art). 3g and beads made of PMMA with a molar ratio of 0.38 (MIU) 2g 'dissolved in a stupid heart. Applying the back coating layer solution to the other surface of the PET sheet having the light diffusion layer using a bar coater, followed by "temperature" in the hot air material, thereby producing a bead having a thickness-containing thickness The light diffusing plate of the back coating layer 27 1343870 was tested. Test Example 1 The light diffusing plates of the above Examples 1 to 4 and Comparative Example 1 were evaluated by the following methods: (1) Scratch resistance The scratch on the light diffusing plate was observed by a friction test with a light guide plate. Here, a surface property testing machine "HEIDON-14DR" manufactured by Nippon Shinto Scientific Co., Ltd. was used. The speed was set to 4500 _/min, the reciprocating distance was set to 15 mm, the number of repetitions was set to 2000, and a weight of 50 g was applied. The inspection by the naked eye was used as the result of the evaluation. The third a diagram shows a comparison example 1 A photograph of the surface state of the produced light diffusing plate after the friction test, and the φ3b diagram shows a photograph of the surface state of the light diffusing plate produced in accordance with Example 4 of the present invention after the friction test. Third a and third b, when the light diffusing plate is in contact with the light guiding plate, since the friction coefficient of the beads is small, it can be seen that a small number of scratches are formed on the light diffusing plate of the present invention. The elasticity of the second bonding resin ensures a distance that allows the beads to move, thereby reducing the damage of the scratch. ^ (2) Evaluation of wear resistance using a whole machine (taber abraser, using a wear 28 13343870 The wheel CS-17 and a load Ikg) were used to measure the abrasion resistance of the back coating layer of each of the light diffusing plates produced in Example 4 and Comparative Example 1. 'Each light diffusing plate was prepared into a dish shape A test piece is mounted on the test piece and rotated, thereby abrading the test piece. Next, the weight of the abrasion test piece is measured. The fifth figure shows the test result of the light diffusion plate. The fifth figure shows a graph of the wear resistance test results of the light diffusing plate, which are made according to the embodiment 4 of the present invention and the comparative example 1. Referring to the fifth figure, according to the comparative example The amount of reduction of the test piece of the prepared light diffusing plate, It is proportional to the increase in revolutions per minute (rpm) of the wear wheel. On the other hand, the test piece of the light diffusing plate made in Example 4 of the present invention has a reduction amount close to zero until the minute of the wear wheel The number reached approximately 300 rpm, and since then the number of revolutions per minute of the wear wheel reached 1000 rpm. The reduction was still maintained at a low value. Further, according to the inspection of the naked eye, it was made according to Comparative Example 1. The second bonding resin of the light-diffusing sheet is peeled off. On the other hand, any portion of the second bonding resin of the test piece of the light-diffusing sheet prepared in Example 4 is not peeled off. Therefore, the light-diffusing sheet of the present invention can be observed. It has excellent wear resistance. (3) The luminance evaluation was performed using a device called BM7 (manufactured by Topcon Corporation), and the measurement angle was 1 degree. Measure a total of 29 1343870 sections of a light diffuser. The nine measurement areas are numbered. Fig. 4 is a view showing a luminance measuring area of a light diffusing plate according to another embodiment of the present invention. Table 1 shows the luminance measured in nine regions of each light diffusing plate using the above apparatus. These light diffusing plates were produced in accordance with Examples 1 to 4 and Comparative Example 1. Table 1 1 2 3 4 5 6 7 8 9 Average stimulating rate (%) Example 1 3737 3246 3293 3258 3521 3425 3178 3206 3078 3327 1.2 Example 2 3713 3218 3265 3238 3509 3389 3154 3178 3086 3306 0.5 Example 3 3792 3281 3325 3313 3569 3433 3214 3262 3142 3370 2.5 Example 4 3836 3309 3345 3317 3593 3485 3269 3305 3178 3404 3.5 Comparative Example 1 3689 3198 3242 3214 3493 3401 3126 3166 3066 3288 0.0 As shown in Table 1, the measurement is compared Example 1 The luminance of the region 1 30 1343870 to 9 of the light diffusing plate was prepared, and the average luminance was calculated. Next, the average luminance of each of the light diffusing plates was calculated in accordance with Examples 1 to 4, and compared with the average luminance of the light diffusing plate produced in Comparative Example 1. Thereby, the increase rate of the average luminance of each of the light diffusing plates produced in accordance with Examples 1 to 4 was calculated. Namely, the average luminance of the light diffusing plate prepared in Comparative Example 1 was taken as a reference luminance. Referring to Table 1, it is understood that the average luminance increase rates of the light diffusing sheets produced in Examples 1 to 4 were 1.2%, 0.5%, 2.5%, and 3.5%, respectively.
從上述結果’與起因於珠粒之多層配置造成雙折射進 而導致低輝度之習知光擴散板相比較,可證明本發明之先 擴散板係藉由珠粒之單層配置、消除阻塞及減少因與〜a 置在鄰接該光擴散板背面之導光板摩擦而產生之刮傷,來 達成輝度的改善。 經由上述可顯而易見,本發明係提供一應用於液晶顯 示器之背光模組之高輝度光擴散板,其增加輝度、減^發 生於光擴散板之背面的刮傷、並消除阻塞及提供一製造誃 光擴散板之方法。 雖然基於說明之目的揭示本發明之較佳具體實施例 然而热習本技藝者應瞭解可在不背離隨附之申請專利範 所揭示之領域及精神下,進行各種修正、增加及取代。 【圖式簡單說明】 藉由下列隨附之圖式及配合詳細的描述,將可更、、主 地瞭解本發明之上述及其他物件、特徵及其他優點。其I楚 第一圖係表示習知液晶顯示器背光模組之一示意分解 31 1343870 透視圖; 第二圖係表示依據本發明一具體實施例之一光擴散板 的剖面圖; 第三a圖係表示光擴散板經摩擦試驗後表面狀態之一 照片,該光擴散板係依據比較實施例1製成; 第三b圖係表示光擴散板經摩擦試驗後表面狀態之一 照片,該光擴散板係依據本發明之實施例4製成; 第四圖係表示依據本發明另一具體實施例光擴散板輝 β度測量區域之-示意圖; 第五圖係表示該光擴散板耐磨耗測試結果之一圖表, ' 該些光擴散板係依據本發明實施例4及比較實施例1製 ' 成;及 第六圖係表示液晶顯示器背光模組之一分解透視圖, 其係採用依據本發明另一具體實施例之一光擴散板。 φ 【主要元件符號說明】 100光源 110反射板 120導光板 130光擴散板 140稜鏡板 150棱鏡板 160保護板 200光擴散層 32From the above results, compared with the conventional light diffusing plate which causes the birefringence caused by the multi-layer configuration of the beads to cause low luminance, it can be proved that the first diffusion plate of the present invention is configured by a single layer of beads, eliminating clogging and reducing the cause and effect. ~a A scratch caused by friction of a light guide plate adjacent to the back surface of the light diffusing plate to achieve an improvement in luminance. It is apparent from the above that the present invention provides a high-intensity light diffusing plate applied to a backlight module of a liquid crystal display, which increases brightness, reduces scratches occurring on the back surface of the light diffusing plate, and eliminates clogging and provides a manufacturing process. Method of light diffusing plate. While the invention has been described with respect to the preferred embodiments of the present invention, it will be understood that various modifications, additions and substitutions may be made without departing from the scope and spirit of the invention. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and other advantages of the present invention will become more apparent from the <RTIgt; The first figure shows a schematic exploded view of a conventional liquid crystal display backlight module 31 1343870; the second figure shows a cross-sectional view of a light diffusing plate according to an embodiment of the present invention; A photograph showing a state of the surface of the light diffusing plate after the friction test, the light diffusing plate being made according to Comparative Example 1; and the third b drawing showing a photo of the surface state of the light diffusing plate after the friction test, the light diffusing plate The fourth embodiment is based on the fourth embodiment of the present invention; the fourth figure is a schematic view of the light diffusion plate according to another embodiment of the present invention; the fifth figure shows the wear resistance test result of the light diffusion plate. One of the charts, 'the light diffusing plate is made according to the fourth embodiment of the present invention and the comparative example 1; and the sixth drawing is an exploded perspective view of the liquid crystal display backlight module, which is based on the present invention. A light diffusing plate of one embodiment. Φ [Description of main component symbols] 100 light source 110 reflector 120 light guide plate 130 light diffusion plate 140 稜鏡 plate 150 prism plate 160 protection plate 200 light diffusion layer 32
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KR1020060042044A KR100744842B1 (en) | 2006-05-10 | 2006-05-10 | High brightness light-diffusion sheet for back-light unit of liquid crystal display and method for manufacturing thereof |
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US8882327B2 (en) * | 2012-09-28 | 2014-11-11 | Skc Haas Display Films Co., Ltd. | Composite light guide plate |
JP7383448B2 (en) * | 2019-10-18 | 2023-11-20 | リンテック株式会社 | Adhesives, adhesive sheets, backlight units and display devices |
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JP5054872B2 (en) * | 2001-02-22 | 2012-10-24 | 恵和株式会社 | Light diffusion sheet and backlight unit using the same |
US6908202B2 (en) * | 2002-10-03 | 2005-06-21 | General Electric Company | Bulk diffuser for flat panel display |
JP2004198707A (en) | 2002-12-18 | 2004-07-15 | Keiwa Inc | Optical sheet and back light unit using the same |
JP2004226604A (en) * | 2003-01-22 | 2004-08-12 | Sekisui Plastics Co Ltd | Synthetic resin particle, light diffusion plate, backlight unit for liquid crystal display and liquid crystal display device |
US7314652B2 (en) * | 2003-02-28 | 2008-01-01 | General Electric Company | Diffuser for flat panel display |
JP4074847B2 (en) | 2003-09-30 | 2008-04-16 | 恵和株式会社 | Optical sheet and backlight unit using the same |
JP2005326774A (en) * | 2004-05-17 | 2005-11-24 | Soken Chem & Eng Co Ltd | Optical diffusion sheet and resin composition used for the same |
KR20060016518A (en) * | 2004-08-18 | 2006-02-22 | 삼성전자주식회사 | Display apparatus |
JP4029299B2 (en) * | 2004-09-06 | 2008-01-09 | 日本ゼオン株式会社 | Light diffusing resin composition and light diffusion molded product |
JP2005107553A (en) | 2005-01-06 | 2005-04-21 | Minoru Yoshida | Optical diffusion sheet and back light unit employing the same |
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2006
- 2006-05-10 KR KR1020060042044A patent/KR100744842B1/en active IP Right Grant
- 2006-11-24 TW TW095143628A patent/TWI343870B/en active
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CN100460953C (en) | 2009-02-11 |
TW200742669A (en) | 2007-11-16 |
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