201122566 六、發明說明： 【發明所屬之技術領域】 種擴散片 本發明係關於— 之用於背光模組之擴散片 尤指一種可避免受熱變形 【先前技術】 液晶顯示器具有低$201122566 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a diffuser for a backlight module, especially one that avoids heat deformation. [Prior Art] Liquid crystal display has a low $
-此、體積小、壽命長等優點，E 此作為各種書像輪屮驻要工， -1豕輸出裝置而受矚目。液晶顯示器（lcd) 與其他自發光型顯示以同’液晶本身是非發光型材料 所以需要外在光源才能使其顯像。用於提供液晶顯示器, 源的部份稱為背光槿組 供、，且责先楔組中具有光學膜片，用& 提高背光源的均勻性以及中心輝度。 背光模組其主要構成的組件包括有入射光源、反射片 (Reflector )、導光板（Ught㈣心)或擴散板擴散 片（DiffUSi〇n FUm )、增光片（Brightness Enhancement Fiim ) 筹同時其依入射光源設立位置可分為（i )側光源式結構， 即將入射光源設在導光板的側邊，此種型式因厚度較薄， 所以通常被應用在筆記型電腦或桌上型監視器；（2 )直下 式光源結構.，即將入射光源設在擴散板的下方，通常這種 型式的使用都是運用在尺寸較大的監視器或電視上，而且 因其尺寸較大，故為提供適切的亮度，於擴散板下方會設 置夕只的入射光源。但不論是側光源式或直下式的結構， 光源經由導光傳遞或直接透出擴散板，可能會有明暗不均 201122566 的現象，因此必須在導光板或擴散板上設置數張光學膜 片’以將通過導光板或擴散板的光線均句化。 ▲光予膜片包含有擴散片及增光片。擴散片功能為遮蔽 導光板網點、瑕疲’使光線均勻化。增光片功能為將均勻 的擴散光源往面板法線方向集中，提升輝度以達節能省電 的目的。- This has the advantages of small size and long life. E is a work of various book-like rims, and it is attracting attention as an output device. The liquid crystal display (lcd) is the same as other self-illuminating displays. The liquid crystal itself is a non-light-emitting material, so an external light source is required to make it visible. For providing a liquid crystal display, the part of the source is called a backlight 槿 group, and the optical film is provided in the wedge group, and the uniformity of the backlight and the central luminance are improved by & The main components of the backlight module include an incident light source, a reflector, a light guide (Ught), a diffusion diffuser (DiffUSi〇n FUm), and a brightness enhancement (Finess Enhancement Fiim). The setting position can be divided into (i) side light source structure, that is, the incident light source is disposed on the side of the light guide plate. This type is usually applied to a notebook computer or a desktop monitor because of its thin thickness; (2) Straight-type light source structure. The incident light source is placed under the diffuser. Usually, this type of use is used on a large-sized monitor or TV, and because of its large size, it provides appropriate brightness. The incident light source of the evening is set below the diffuser plate. However, whether it is a side light source type or a direct type structure, the light source transmits light or directly passes through the diffuser plate, and there may be a phenomenon of uneven brightness and darkness 201122566. Therefore, several optical films must be disposed on the light guide plate or the diffusion plate. The light passing through the light guide plate or the diffusion plate is uniformized. ▲The light film contains a diffusion sheet and a brightness enhancement sheet. The function of the diffuser is to shield the light guides from the dots and to make the light uniform. The function of the brightness enhancement is to concentrate the uniform diffused light source toward the normal direction of the panel, and enhance the brightness to save energy and save electricity.
4閱第1圖’係為習用擴散片之組成示意圖，如圖所 1錢政片1G主要由—透光基材11以及黏附於該透光 基材11正反二面之第-膠層丨2與第二膠層13所組成。該 «“於製作時，通常會於第一膠層12中添加作為光 振政粒子之有機或無機珠（beads )，並將其塗佈於透光基 相11上’使其具有光擴散的效果。然，擴散片w所添加 之光擴散粒子常有脫落的可能，此些脫落之㈣散粒子會 在稜鏡片與擴散4 10間移動摩擦，進而造成刮傷，影響顯 示的品質。 ’閱第2圖’係為另一習用擴散片之組成示意圖，如 圖所不.4擴散片2〇主要由一透光基材2 i以及黏附於該 透光基材21正反二面之塗佈層22與防黏層η所組成。塗 佈層22為一黏稠狀樹脂之透明塗佈層，將不添加光擴散粒 子，可避免光擴散粒子脫落現象的發生。塗佈層22表面係 透匕輾[的方式而分佈凹凸深度之花紋，及粗糙之表面， 二茗由粗锬的表面製造擴散效果。防黏層U表面係透過輾 201122566 屢的方式而分佈凹凸深度之花紋，並可利用凹凸花紋具有 ‘司-深度間隙使其不會產生靜電而黏貼於導光板上。然， 無論是塗佈層22粗糙之表面或陶23凹凸花紋之表 面，通常都是透過珠擊法或钱刻法來製造輕塵輕輪之粗链 表面，再塗佈至透光基材上。此兩種方式皆無法控制表面 粗縫度之均勾，生’易產生亮點以及明暗帶，因此難以堪稱 貫用。再者，由於透光基 久—曲之塗佈層22盥防 黏層23的材質不相同’其受熱的膨腺係數也不相同，故舍 塗佈層22與㈣層23受到光源所散發之高熱影響時，就 會使擴散片20發㈣曲的現象，影響顯示的品質與其光學 效能。 如上所述’如何在受光源高熱影響的前提下，使 月同樣能達到維持甚至 之思考方向 I.發明内容 擴散 增加光學政能’實為一具有實用性 由是，本發明之 的，即在於提供一種用於背光 模組之擴散片，以達 與 先予效此不受光源高熱影響之功效 根據本發明所揭露 — 種用於背光模組之擴散片，其 主要係由一透光基材以 刀別塗佈於該透光基材上下表面 之一第一膠層與一第二膠 /曰所構成；其中，該第一膠層與 3弟二膠層之材質實 、 且其材質均含有一單體、一 201122566 低聚物以及一光起始劑，該單體之成份包含一單官能基單 體與一多官能基單體中之任一者，該低聚物之成份包含聚 氨酯丙烯酸秘s旨、環氧丙烯酸樹酯、聚酯丙烯酸樹酯、聚 醚丙烯酸樹酯與純丙烯酸樹酯中之任一者，該光起始劑之 成份包含丨_基-環己基·苯基曱酮、2-基-2-曱基-1-苯基 丙酮、二苯甲酮、安息香類與醯基膦氧化物類中之任—者。 有關本發明之詳細内容及技術，茲說明如下： φ 【實施方式】 參閱第3圖，係為本發明用於背光模組之擴散片之示 意圖，如圖所示，本發明用於背光模組之擴散片3〇，其主 要係由一透光基材3 1以及分別塗佈於該透光基材3 1上下 表面之一第一膠層32與一第二膠層33。在一般的情況下， 第一膠層32與第二膠層33之穿透度係大於85。/〇，霧度介 於20%〜85%之間’而其厚度則介於2μιη〜2〇μηι之間。第一 _膠層32與第二膠層33可為-紫外光固化膠，纟可藉由改 變紫外光固化膠的成分來調整第一膠層32與第二膠層Μ 之穿透度與霧度。第一膠層32與第二膠層33可添加抗靜 電劑以減低靜電吸附現象的發生。 當擴散片受到光源高熱影響時，若擴散片僅一表面塗 佈膠層或二表面塗佈材質不同之膠層時，就會因為膠層的 %脹係數與透光基層的膨脹係數不同的關係而導致荷葉邊 (或稱波浪邊waving )及翹曲的現象，將會影響顯示的品 201122566 ί!本^月用於责光模組之擴散片3 ο係於透光基材3 i上 |表面之塗佈材質實質相同之第—膠層32與第二膠層 33，故當擴散片30受到光源高熱影響日夺，第一膠層32與 知-膠層3 3 X熱膨脹產生的應力相當，可降低擴散片3 〇 整體翹曲的發生機率。 透光基材31之材質為聚對苯二甲酸乙二醇酯（ρΕτ )， 第一膠層32與第二膠層33係具有材質實質相同，其材質 Φ均含有一單體、一低聚物以及一光起始劑。 該單體之成份包含一單官能基單體或一多官能基單 骼，無淪疋單官能基單體或多官能基單體，其成分均是由 2 -苯氧基乙基丙烯酸酯、二丙二醇二丙烯酸酯、三丙二醇 二丙烯酸酯、1，6-己二醇二丙烯酸酯三羥曱基丙烷三丙烯酸 酯以及乙氧化三經曱基丙烧三丙稀酸酯所組成的群組中選 出者。此外’該單體之成份亦可由2_苯氧基乙基丙烯酸酯、 _ 一丙一醇一丙稀酸醋、三丙二醇二丙烯酸g旨、ι，6 -己二醇二 丙烯酸酯三羥甲基丙烷三丙烯酸酯以及乙氧化三羥甲基丙 烷三丙烯酸酯等單官能基單體與多官能基單體所組成。 該低聚物之成份包含聚氨酯丙烯酸樹酯 '環氧丙烯酸 樹酯、聚酯丙烯酸樹酯、聚醚丙烯酸樹酯與純丙烯酸樹酯 中之任一者。此外，該低聚物之成份亦可由聚氨酯丙烯酸 樹酯、環氧丙烯酸樹酯、聚酯丙烯酸樹酯、聚醚丙稀酸樹 酯以及純丙稀酸樹酯所組成。其中，聚氨酯丙烯酸樹酯之 8 201122566 ♦ « 延展性較佳.，若其添加量以重量百分比計為 5wt·%〜30wt.%，則可增加第—膠層32與第二膠層33 (即 擴散片30 )膜面韌性及耐刮傷性。4] Figure 1 is a schematic diagram of the composition of the conventional diffusion sheet. As shown in the figure, 1G Qianzheng 1G mainly consists of a light-transmitting substrate 11 and a first layer of glue which is adhered to the front and back sides of the light-transmitting substrate 11 2 is composed of a second adhesive layer 13. In the production, organic or inorganic beads as photo-vibrating particles are usually added to the first adhesive layer 12 and coated on the transparent base phase 11 to make it light-diffusing. However, the light-diffusing particles added by the diffusion sheet w often have the possibility of falling off, and the scattered (four) scattered particles will move and rub between the cymbal and the diffusion 4 10, thereby causing scratches and affecting the quality of the display. Fig. 2 is a schematic view showing the composition of another conventional diffusion sheet. As shown in Fig. 4, the diffusion sheet 2 is mainly composed of a light-transmitting substrate 2i and a coating adhered to the front and back surfaces of the transparent substrate 21. The layer 22 is composed of the anti-adhesive layer η. The coating layer 22 is a transparent coating layer of a viscous resin, and the light-diffusing particles are not added to prevent the occurrence of the light-diffusing particles from falling off. The surface of the coating layer 22 is transparent.辗[The way to distribute the concave and convex depth pattern, and the rough surface, the second layer creates a diffusion effect from the rough surface. The anti-adhesive layer U surface is distributed through the 辗201122566 The pattern has a 'situ-depth gap so it won't Electrostatically adhered to the light guide plate. However, whether it is the rough surface of the coating layer 22 or the surface of the embossed pattern of the ceramic 23, the thick chain surface of the light dust wheel is usually produced by the beading method or the money engraving method. It is applied to the light-transmissive substrate. These two methods can not control the uniformity of the rough surface of the surface. It is easy to produce bright spots and bright and dark bands, so it is difficult to use. The material of the anti-adhesive layer 23 of the curved coating layer 22 is different from the material of the anti-adhesive layer 23, and the enveloping coefficient of the heated coating layer 22 is different. Therefore, when the coating layer 22 and the (four) layer 23 are affected by the high heat emitted by the light source, the diffusion sheet is made. The phenomenon of 20 rounds (four) is affecting the quality of the display and its optical performance. As mentioned above, 'how can the moon be maintained or even the direction of thinking under the premise of being affected by the high heat of the light source. I. The content of the invention spreads to increase the optical power. For practical use, the present invention provides a diffusion sheet for a backlight module to achieve the effect of pre-emptive effect on the high heat of the light source. Module a sheet consisting of a first adhesive layer coated on the upper and lower surfaces of the light-transmitting substrate and a second adhesive layer by a knife-transparent substrate; wherein the first adhesive layer and the third adhesive layer are The material of the second adhesive layer is real and the material thereof contains a monomer, a 201122566 oligomer and a photoinitiator, and the monomer component comprises a monofunctional monomer and a polyfunctional monomer. Either the component of the oligomer comprises any one of urethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate and pure acrylic resin, the photoinitiator The composition includes any one of 丨-yl-cyclohexyl phenyl fluorenone, 2-yl-2-mercapto-1-phenylacetone, benzophenone, benzoin and decylphosphine oxide. The details and techniques of the present invention are as follows: φ [Embodiment] Referring to FIG. 3, it is a schematic diagram of a diffusion sheet for a backlight module of the present invention. As shown in the figure, the present invention is used for a backlight module. The diffusion sheet 3 is mainly composed of a transparent substrate 3 1 and coated on the transparent substrate 3 1 One surface of the first adhesive layer 32 and a second adhesive layer 33. In the general case, the first adhesive layer 32 and the second adhesive layer 33 have a transmittance greater than 85. /〇, the haze is between 20% and 85%' and the thickness is between 2μιη and 2〇μηι. The first adhesive layer 32 and the second adhesive layer 33 may be UV-curable adhesives, and the transmittance and fog of the first adhesive layer 32 and the second adhesive layer may be adjusted by changing the composition of the ultraviolet curing adhesive. degree. The first adhesive layer 32 and the second adhesive layer 33 may be added with an antistatic agent to reduce the occurrence of electrostatic adsorption. When the diffusion sheet is affected by the high heat of the light source, if the diffusion sheet is coated on only one surface with a rubber layer or a coating layer with different surface coating materials, the relationship between the % expansion coefficient of the adhesive layer and the expansion coefficient of the transparent substrate is different. The phenomenon that the ruffle edge (or wavy edge) and warpage will affect the displayed product 201122566 ί! This month is used for the diffusion film of the light-receiving module 3 ο on the transparent substrate 3 i | The coating material of the surface is substantially the same as the first adhesive layer 32 and the second adhesive layer 33. Therefore, when the diffusion sheet 30 is affected by the high heat of the light source, the first adhesive layer 32 is equivalent to the stress generated by the thermal expansion of the adhesive layer 3 3 X. , can reduce the probability of occurrence of the warpage of the diffusion sheet 3 〇. The material of the light-transmitting substrate 31 is polyethylene terephthalate (ρΕτ), and the first adhesive layer 32 and the second adhesive layer 33 have substantially the same material, and the material Φ contains one monomer and one oligomer. And a photoinitiator. The monomer component comprises a monofunctional monomer or a polyfunctional mono-host, a non-fluorene monofunctional monomer or a polyfunctional monomer, the composition of which is composed of 2-phenoxyethyl acrylate, a group consisting of dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate trihydrocarbyl propane triacrylate, and ethoxylated tris-propyl mercapto triacrylate Elected. In addition, the monomer component can also be composed of 2-phenoxyethyl acrylate, _ propyl alcohol-acrylic acid vinegar, tripropylene glycol diacrylate g, i, 6-hexanediol diacrylate trihydroxyl A monofunctional monomer such as a propane triacrylate and an ethoxylated trimethylolpropane triacrylate is composed of a polyfunctional monomer. The oligomer component comprises any of urethane acrylate 'epoxy acrylate, polyester acrylate, polyether acrylate and pure acrylic resin. Further, the oligomer component may be composed of urethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate, and pure acrylic resin. Among them, urethane acrylate 8 201122566 ♦ « ductility is better. If the amount of addition is 5wt·%~30wt.% by weight, the first layer 32 and the second layer 33 may be added (ie Diffusion sheet 30) Film surface toughness and scratch resistance.
該光起始劑之成份包含1-基-環己基-笨基甲酮、2-基 甲基-1-苯基-1_丙酮、二笨甲酮、安息香類與醯基膦氧 。物類中之任-者，亦可由1•基·環己基_苯基甲酮、2·基I 土1笨基1_丙酮、二苯甲酮、安息香類以及醯基膦氧化 警物類所組成。 办再者，為降低靜電吸附現象的發生’可於該膠層中添 靜電W以增加抗靜電功能，並減少表面吸附的問 抗靜電劑成份為金屬導電.粒子、金屬氧化物與四級錄 叱等，其添加量可為3wt %〜25wt %。 巨觀來說，第-膠層32與第二膠層33的單體部份約The components of the photoinitiator include 1-yl-cyclohexyl-phenylidenone, 2-methylmethyl-1-phenyl-1-propanone, dimercaptoketone, benzoin and mercaptophosphine. Any one of the species may also be composed of 1 • yl cyclohexyl phenyl ketone, 2 · yl I soil 1 phenyl 1 ketone, benzophenone, benzoin and sulfhydryl oxidized police composition. In order to reduce the occurrence of electrostatic adsorption phenomenon, 'Adding static electricity to the adhesive layer to increase the antistatic function, and reducing the surface adsorption. The antistatic agent composition is metal conductive. Particles, metal oxides and four grades The amount of addition may be from 3 wt% to 25 wt%. In the macro view, the monomer layer of the first adhesive layer 32 and the second adhesive layer 33 are about
3。：體的2〇wt·%〜6〇wt % ’低聚物部份約佔整體的 ^°H7〇wt.%，而光起始劑部份則約佔整體的3 •/°〜1〇Wt.%。其比例與成分可以視需要改變，使擴散片 的霧度與透光度亦隨之改變。 度丨參閱第4圖，係為本發明第-膠層表面紋路之示意 賀丨二圖所示：由於第-膠層32與第二膠層33係具有材 二：相Θ ’其表面均分佈有均勻之凹凸紋路，即其表面 偉：又刀佈的相當均勻’將不易產生亮點以及明暗帶。為 '弟-膠層32與第二膠層33表面凹凸紋路（粗糙度）佈 201122566 均勾，本發明之擴散片30藉由精準控 ^ ^ m ^ /V 錢時間、電鍍電 城及化學成份即可控制輥輪表面粗糙 , JiL ώ , ^才月进電鍍輥輪表 粗才^)，再將其Μ於第—膠層32與第二膠層33表 面，如此可使得凹凸紋路（粗輪度）分佈均勾。因此，利 用精密電鍍輥輪並將其輾壓於第一 ..^ 妙赝32與第二膠層33 作凹凸紋路（粗糖表面)’我們可控制第-膠層32與第 -膠層33之表面粗糖度及其組成成分來達到所需霧度。 雖然本發明以前述之較佳實施例揭露如上，然其並非 用=限定本發明，任何熟習此技藝者’在不脫離本發明之 内，當可作些許之更動與潤飾，因此本發明之 、D範圍當視後附之申請專利冑圍所界定者為準。 第 第 第 【圖式簡單說明】 圖 係為習用擴散片之組成示意圖； 圖 圖 係為另一習用擴散片之組成示意圖； 係為本發明用於背光模組之擴散片之示音 圖；以及 第4圖 係為本發明第一膠層表面紋路之示意圖。 201122566 I【主要元件符號說明】 10 擴散片 11 透光基材 12 第一膠層 13 第二膠層 20 擴散片 21 透光基材 22 塗佈層 23 防黏層 30 擴散片 31 透光基材 32 第一勝層 33 第二膠層3. : 2〇wt·%~6〇wt % of the body 'The oligomer part accounts for about ^°H7〇wt.% of the whole, while the photoinitiator part accounts for about 3 •/°~1〇 of the whole. Wt.%. The proportion and composition can be changed as needed, so that the haze and transmittance of the diffuser also change. Referring to Fig. 4, it is a schematic diagram of the surface texture of the first rubber layer of the present invention. Since the first rubber layer 32 and the second rubber layer 33 have the material two: phase Θ 'the surface is evenly distributed There is a uniform embossing, that is, the surface is sturdy: and the knives are fairly uniform' will not easily produce bright spots and bright and dark bands. For the 'D-gel layer 32 and the second adhesive layer 33 surface embossed grain (roughness) cloth 201122566 are hooked, the diffusion sheet 30 of the present invention is precisely controlled by ^ ^ m ^ /V money time, electroplating electricity and chemical composition It is possible to control the surface roughness of the roller, JiL ώ, ^ before the plating roller is thick, and then smash it on the surface of the first rubber layer 32 and the second rubber layer 33, so that the concave and convex lines (coarse wheel) Degree) is distributed. Therefore, using the precision plating roller and pressing it on the first ..^ 赝 赝 32 and the second adhesive layer 33 as the embossed grain (raw sugar surface) 'we can control the first rubber layer 32 and the first rubber layer 33 The surface roughness and its composition are used to achieve the desired haze. While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and those skilled in the art can make some modifications and refinements without departing from the invention. The scope of D is subject to the definition of the patent application. The first drawing is a schematic diagram of the composition of the conventional diffusion sheet; the drawing is a schematic diagram of the composition of another conventional diffusion sheet; the sounding diagram of the diffusion sheet for the backlight module of the present invention; Figure 4 is a schematic view showing the surface texture of the first adhesive layer of the present invention. 201122566 I [Main component symbol description] 10 diffuser 11 transparent substrate 12 first adhesive layer 13 second adhesive layer 20 diffuser 21 transparent substrate 22 coating layer 23 anti-adhesive layer 30 diffusion sheet 31 transparent substrate 32 first victory layer 33 second rubber layer