1378269 九、發明說明： 【發明所屬之技術領域】 本發明有關於一種用於液晶顯示器或是照明裝置之背 光模組的光擴散板。 5【先前技術】 隨著工業社會已朝向先進資訊時代發展，因此，用於 顯示與傳輸各種資訊之媒介的電子顯示器的重要性也與曰 俱A。以在’體積龐大的陰極射線管（Cathodp Ray Tube,以 下簡稱CRT)被廣泛地應用，但以裝設CRT所需空間的觀 丨〇點來看，卻面臨到相當多的限制，以致於難以製造具有大 尺寸的CRT。因此，CRT逐漸被各種型式的平面顯示器所 取代，包括液晶顯示器(LCD)、電漿顯示器(pdp)、場發射 顯不器（FED)以及有機電致發光顯示器(EL)。在這些平面顯 示器中，特別是LCD，為一種結合液晶_半導體技術而產生 15的技術密集性產品，由於其輕薄且耗電量低，所以佔有優 勢。因此，其結構與製造技術的研究與發展持續不斷。現 今，已被應用於諸如筆記型電腦、桌上型電腦用螢幕以及 可攜式個人通訊設備（個人數位助理(pDA)與行動電話）等 領域的LCD，被製造成較大的尺寸，因而可將LCD應用於 2〇大尺寸的電視，例如高畫質(High Definiti〇n，Η〇)電視。因 此，LCD作為一種能夠取代以往猶如顯示器同義字般之 CRT的新穎顯示器，而備受矚目。 —f LCD中，由於液晶本身無法發射光，所以在其背面 額外提供光源’致使在各晝素(pixd)巾穿過液晶之光的強度 [s] 1378269 係被控制而達成對比(c〇ntrast)效果。更具體而言，lcd作 為種使用液晶材料之電氣性質來調整透光度的裝置，係 自tr於表面之光源燈發射光’並且，為了將發光效 率提昇至最高，以此方式所發射的光，穿透各種功能片或 5力月twf膜致使光成為均勾且具方向性者，之後，此種被 控制的光亦穿透彩色滤光片，從而實現紅、綠與藍(R，G，B) 顏色。更且’ LCD為間接光發射型式，係透過電氣方法， 藉由控制各晝素的對比來實現影像。是故，在判斷LCD影 像的品質方面，包括亮度與均勻性，配備有光源之光發射 10裝置被認為是十分重要的。 _，種光發射裝置通常包括統、反射板、導光板、反 射型高亮度膜、稜鏡膜、光擴散膜、以及光擴散板。可使 用各種型式的板或是薄膜，致使來自光源的光能夠盡可能 大量地到達液晶裝置。 15 在這些薄臈或是板中，光擴散板同時具有使自光源燈 發射之光的亮度均勻，以及遮蔽燈的亮紋的功能，更且， 光擴散板亦扮演支持其他光學薄膜的角色。光擴散板係添 加有各種光擴散劑（light-diffusing agent)，以引起光的折 射、散射與反射，進而引導出擴散效應。 !0 為了自光擴散板傳遞大量的光至前表面，需裝設包括 光擴散膜或是稜鏡膜等不同的薄膜。然而，由於增添此種 多層的材料’因而導致製造成本提高與生產率下降。 光擴散膜在輔助擴散板之遮蔽性能的同時，亦有效地 擴政入射光且將光傳遞至前表面。一般而言，光擴散膜包 7 括透明基板以及擴散層，而該擴散層係形成於該透明基板 的表面上。該擴散層包括作為散射劑的球形材料粒子，並 且，藉由該擴散層之黏著劑，與包含在該黏著劑中之該散 射劑之間的折射率差異，實現光擴散膜的擴散效應。由於 5該散射劑係散佈於擴散層中，因此當光穿過該擴散層時， 光係持續地在二個具有不同折射率之介質間相互移動的同 時，予以傳遞。 除此之外，為了透過光擴散膜達到傳遞大量光至前表 面的目標，因此需要提供稜鏡膜，但是此舉卻會造成製造 10成本增加與降低生產率的後果。 【發明内容】 『所欲解決的問題』 因此’本發明提供—種具有單層結構的光擴散板，其 可顯現適當的亮度與優異的遮蔽性質。 此外’本發明提供-種具有多層結構的光擴散板，其 可顯現適當的亮度與優異的遮蔽性質。 此外’本發明提供-種具有單層結構的光擴散板，其 i持遮蔽性質的同時’藉由調整總透光度以顯現充足 20的焭度。 此外’本發明提供一種具有多層結構的光擴散板，其 :持遮祕質的同時，藉由調整總透光度以顯現充足 的允度。 此外’本㈣提供—種域散板，其光擴散劑的型式 與數量係被調整，以顯現最大的亮度。 此外，本發明提供一種光擴散板，係可降低LCD的製 造成本’進而產生經濟效益。 此外’本發明提供一種光擴散板，其尺寸穩定性高， 因此即使在高溫以及高濕度的環境下，仍然不會發生捲曲 現象’且可展現優異的光擴散性質。 『技術手段』 本發明第一實施例所提供的一種光擴散板，係由選自 聚碳酸酯樹脂、聚苯乙烯樹脂、及其混合物的一種基底樹 脂所形成者，並且，在該光擴散板的至少一表面上形成有 圖形層。δ玄光擴散板的總透光度等於或高於4〇〇/。，且亮声 為 4500 cd/mm2。 本發明第二實施例所提供的一種光擴散板，包含有— 基層，係由選自聚碳酸酯樹脂、聚笨乙烯樹脂、及其混合1378269 IX. Description of the Invention: [Technical Field] The present invention relates to a light diffusing plate for a liquid crystal display or a backlight module of a lighting device. 5 [Prior Art] As the industrial society has moved toward the advanced information age, the importance of electronic displays for displaying and transmitting various information media is also important. It is widely used in the 'Cathodp Ray Tube (CRT), but in terms of the space required to install the CRT, it faces considerable restrictions, making it difficult to A CRT having a large size is manufactured. As a result, CRTs have gradually been replaced by various types of flat panel displays, including liquid crystal displays (LCDs), plasma displays (pdp), field emission displays (FEDs), and organic electroluminescent displays (EL). Among these flat-panel displays, particularly LCDs, are a technology-intensive product that combines liquid crystal-semiconductor technology to produce 15 which is advantageous due to its light weight and low power consumption. Therefore, the research and development of its structure and manufacturing technology continues. Nowadays, LCDs in fields such as notebook computers, desktop screens, and portable personal communication devices (personal digital assistants (pDA) and mobile phones) have been manufactured to a larger size. The LCD is applied to a 2" large-sized TV, such as a high-definition (High Definiti〇n, Η〇) TV. Therefore, the LCD has attracted attention as a novel display that can replace the conventional CRT like a display synonym. In the LCD, since the liquid crystal itself cannot emit light, an additional light source is provided on the back side, so that the intensity of the light passing through the liquid crystal of each pixd towel [s] 1378269 is controlled to achieve contrast (c〇ntrast )effect. More specifically, lcd is a device that adjusts the transmittance by using the electrical properties of the liquid crystal material, and emits light from the light source lamp of the surface of the light, and emits light in this manner in order to maximize the luminous efficiency. Through various functional films or 5 twf twf film, the light becomes uniform and directional, and then the controlled light also penetrates the color filter to realize red, green and blue (R, G , B) color. Moreover, the LCD is an indirect light emission type, and the image is realized by controlling the contrast of each element by an electrical method. Therefore, in judging the quality of the LCD image, including brightness and uniformity, a light-emitting device equipped with a light source is considered to be very important. The light emitting device generally includes a system, a reflecting plate, a light guiding plate, a reflective high-brightness film, a ruthenium film, a light diffusing film, and a light diffusing plate. Various types of plates or films can be used, so that light from the light source can reach the liquid crystal device as much as possible. 15 In these thin rafts or plates, the light diffusing plate has the function of uniformizing the brightness of the light emitted from the light source lamp and shielding the bright lines of the lamp, and the light diffusing plate also plays the role of supporting other optical films. The light diffusing plate is provided with various light-diffusing agents to cause the light to be refracted, scattered and reflected, thereby guiding the diffusion effect. !0 In order to transfer a large amount of light from the light diffusing plate to the front surface, a different film including a light diffusing film or a ruthenium film is required. However, the increase in manufacturing cost and productivity is caused by the addition of such a multi-layered material. The light diffusing film effectively diffuses the incident light and transmits the light to the front surface while shielding the shielding property of the diffusing plate. In general, the light diffusing film includes a transparent substrate and a diffusion layer, and the diffusion layer is formed on the surface of the transparent substrate. The diffusion layer includes spherical material particles as a scattering agent, and the diffusion effect of the light diffusion film is achieved by the difference in refractive index between the adhesive of the diffusion layer and the scattering agent contained in the adhesive. Since the scattering agent is dispersed in the diffusion layer, when light passes through the diffusion layer, the light system is continuously transmitted while moving between two media having different refractive indices. In addition, in order to achieve the goal of transmitting a large amount of light to the front surface through the light diffusion film, it is necessary to provide a ruthenium film, but this will result in an increase in manufacturing cost and a decrease in productivity. DISCLOSURE OF THE INVENTION "Problem to be Solved" Therefore, the present invention provides a light diffusing plate having a single layer structure which exhibits appropriate brightness and excellent shielding properties. Further, the present invention provides a light diffusing plate having a multilayer structure which can exhibit appropriate brightness and excellent shielding properties. Further, the present invention provides a light diffusing plate having a single layer structure, which has a shielding property while adjusting the total light transmittance to exhibit a sufficient degree of twist. Further, the present invention provides a light diffusing plate having a multilayer structure which exhibits sufficient transparency by adjusting the total light transmittance while maintaining the secret quality. In addition, this (four) provides a kind of domain plate, the type and quantity of the light diffusing agent are adjusted to show the maximum brightness. Further, the present invention provides a light diffusing plate which can reduce the manufacturing cost of the LCD and thereby generate economic benefits. Further, the present invention provides a light diffusing plate which is high in dimensional stability, so that curling phenomenon does not occur even in an environment of high temperature and high humidity, and excellent light diffusing properties can be exhibited. "Technical means" A light diffusing plate according to a first embodiment of the present invention is formed of a base resin selected from the group consisting of polycarbonate resin, polystyrene resin, and a mixture thereof, and in the light diffusing plate A pattern layer is formed on at least one surface. The total transmittance of the δ-light diffusing plate is equal to or higher than 4〇〇/. And the sound is 4500 cd/mm2. A light diffusing plate according to a second embodiment of the present invention comprises a base layer selected from the group consisting of polycarbonate resin, polystyrene resin, and a mixture thereof.
物的一種基底樹脂所形成者；一表層，形成於該基層的I 少一表面上；以及一圖形層，形成於該表層的至少一表面 上。忒光擴散板的總透光度等於或高於4〇%，且亮度為45的 cd/mm2 ° 本發明第三實施例所提供的—種光擴散板，係由選自 聚碳酸酯樹脂、聚苯乙烯樹脂、及其混合物的一種基底樹 月曰所形成者。該光擴散板的霧度等於或低於9〇%，且總透 光度等於或高於80%。 本發明第四實施例所提供的一種光擴散板，包含有一 基層，係由選自聚碳酸酯樹脂、聚笨乙烯樹脂、及其混合 1378269 物的一種基底樹脂所形成者；以及一表層，形成於該基層 的至少一表面上。該光擴散板的霧度等於或低於9〇%，且 總透光度等於或高於80%。 本發明第一實施例至第四實施例的光擴散板，可進一 步包含一種粒徑專於或小於1〇〇 μιη的光擴散劑。 本發明第-實施例至第四實施例的光擴散板中，該光 擴散劑可為—種或是多種選自下騎構成之族群者：丙烯 酉夂聚口物粒子(acryllcpolymerparticles);苯乙稀聚合物粒子 (styrene polymer particles) ； (olefin polymer pamc^es),丙稀與苯乙稀共聚物粒子；丙烯與烯烴共聚物粒 乙馳馳絲她子；多層多成分好，係藉由 均聚物、共聚物或三聚物粒子，之後再以其它類型 石山=將其覆蓋而得；錢㈣合物粒子；氟樹脂粒子； 15 急介朴粒子，硫酸鋇粒子；氧化矽粒子；氫氧化鋁粒子； 粒子，氧化鍅粒子；氟化鎂粒子；滑石粒子；玻璃 粒子；以及雲母。 并·勹明第二實施例與第四實施例的光擴散板，可進一 ^ ^ ^形成於該光擴散板至少一表面上的圖形層。 形層第一實施例至第四實施例的光擴散板中，該圖 面；；包含複Ϊ個剖面為多角形、半圓形或半橢圓形的多 二 >狀；或是剖面為多角形、半圓形或半橢圓形的柱體 狀·，诉日，0 r~n k些圖形可各自彼此相鄰或不相鄰的排列。 —7 =七明第—貫施例至第四實施例的光擴散板中，該聚 本樹脂可具有等於或高於l〇5〇c的玻璃轉移溫度。 20 1378269 本發明第一實施例至第四實施例的光擴散板中，該聚 苯乙烯樹脂可為其内共聚合有丙烯酸的聚笨乙烯樹脂。 『功效』 依據本發明之一方面，該光擴散板係可顯現充足的亮 5度與優異的遮蔽性質，因此縱使該光擴散板應用於具有大 螢幕的背光模組時，仍可充分地遮蔽光源的影像，並且， 該光擴散板的尺寸穩定性高，使其即使在高溫以及高濕度 的環境下，仍然很少發生捲曲現象。 此外，依據本發明之另一方面，該光擴散板具有高總 10透光度以及夠高的亮度’所以可維持良好的光發射品質。 因此’該光擴散板減少光學薄膜的使用，進而降低其製造 成本，更且，該光擴散板的尺寸穩定性高，使其即使在高 溫以及高濕度的環境下，仍然很少發生捲曲現象。 15【圖式簡單說明] 第一圖為立體圖，顯示本發明第一實施例的擴散板.； 第二圖為立體圖，顯示本發明第二實施例的擴散板； 第二圖為立體圖，顯示本發明第三實施例的擴散板； 以及 ' 2〇 第四圖為立體圖，顯示本發明第四實施例的擴散板。 <圖中所使用之元件符號說明> 10基層 20表層 30, 40, 50, 60 圖形層 1378269 【實施方式】 以下將詳細敘述本發明。 本發明提供一種具有單層結構或是多層結構的光擴散 板，係顯現適當的亮度與優異的遮蔽性質。此種光擴散板 5 是由一種包括聚碳酸酯樹脂以及聚笨乙烯樹脂的基底樹脂 所形成者；前述之聚碳酸酯樹脂以及聚笨乙稀樹脂係可單 獨使用或是混*合使用。 聚碳酸酯樹脂具有優異的耐衝擊性與透光度，以及良 好的对低溫與電氣特性，並且具有耐高溫性與耐吸收性， 10所以其尺寸穩定性非常高。因此，聚碳酸酯樹脂可使用的 溫度範圍很廣，也因而被應用於光學鏡片、光碟片材料、 安全帽、保護裝置以及覆蓋物等。 本發明t所使用的聚碳酸酯樹脂包括，藉由二羥基酚 (dihydroxy phenol)與光氣(phosgene)反應，或是二羥基酚與 15 碳酸鹽前驅物（carbonate precursor)反應所得者，如典型的芳 香族聚碳酸酯樹脂、線性及支鏈的碳酸酯均聚物、聚酯共 聚物、及其混合物。二羥基酚的範例包括2,2-雙（4-羥基苯 基）丙烧（即雙S分 A) (2,2-bis(4-hydroxyphenyl)propane， bisphenol A)、雙 （4-羥基苯基）甲烷 2〇 (bis(4-hydroxyphenyl)methane)、2,2-雙（4_羥基-3,5-二曱基 苯基）丙烧（2,2-bis(4-hydroxy-3,5-dimethylphenyl) propane)、以及1，1-雙（4-羥基苯基）環己烷 (l，l-bis(4-hydroxyphenyl)cyclohexane);而碳酸鹽前驅物的 範例包括碳酸二苯自旨（diphenyl carbonate)、幾基鹵化物 [S] 1378269 (carbonyl halide)以及碳酸二芳酯（diaryl carbonate)。 本發明中所使用的聚碳酸酯樹脂，在3〇〇°C以及荷重 1.2公斤的條件下，依據ASTM D1238定義出的熔融指數 (melt index，MI)為每 10 分鐘 7 至 30 克(7〜3〇 g/i〇 min) 〇 5 在基底樹脂方面，當單獨使用聚苯乙埽樹脂時，可使 用具有玻璃轉移溫度等於或高於105°C的範例，以增加财 熱性；並且，所使用之聚苯乙烯樹脂，其内的丙烯酸為共 聚合形態者。 由於聚笨乙烯樹脂為剛硬、無色且透明者，並具有良 10好的電氣性質，且由於其可大量生產所以成本低廉，因此 被應用於各種領域，包括日用品，諸如廟_房零件、文具材 料與傢俱；機械用大型模造零件；以及電氣設備（電化製 品）’諸如電視機殼。 在基底樹脂方面，當使用聚碳酸酯樹脂與聚苯乙烯樹 15脂的混合物時，可使用在200。(：以及荷重5公斤的條件下， 依據ASTM D1238定義出之熔融指數(melt index，mi)為每 10分鐘0_5至3克(0.5〜3 g/l〇 min)的聚苯乙烯樹脂。 當使用聚碳酸酯樹脂與聚笨乙烯樹脂的混合物時，其 可為使用直徑30 mm的雙螺桿擠壓機（twin screw 2〇 extruder)，在馬達轉速25〇 rpm，且成型溫度2〇〇至3〇〇〇c， 較佳為250°C條件下熔融混合(melt-mixed)之。 當聚碳酸酿樹脂與聚苯乙烯樹脂混合時，為了達到聚 石反酸醋樹脂之可撓性與尺寸穩定性的優點，以及聚苯乙烯 樹脂之抗吸（性與強度的優點，二者混合的重量比例可為} [S] 13 1378269 比9至9比1。 或者是，本發明中的光擴散板可具有多層結構，該多 層結構包含有一基層，以及在該基層之一表面或二表面上 的表層。 5 该表層的組成並沒有特別限制，並且，舉例來說，用 於該表層的基底樹脂，包括藉由共聚合丙烯酸單體與苯乙 烯單體所獲得之苯乙烯-丙烯酸共聚物樹脂。 作為有用的單體’該丙烯酸單體包括選自下列的一種 或疋多種，甲基丙稀酸烧自旨（methacrylie acid alkyl ester)、 ίο丙烯酸烧酯(acrylic acid alkyl ester)、曱基丙烯酸環烷酯 (methacrylic acid cycloalkyl ester)、丙烯酸環烧酯（acrylic acid cycloalkyl ester)、甲基丙烯酸芳西旨(methacrylic acid aryl ester)以及丙稀酸芳g旨(aerylie acid ary 1 ester);而苯乙烯單體 * 包括苯乙烯或是被取代的苯乙烯。前述被取代的苯乙烯包 I5 括烧基苯乙稀（alkyl styrene)，例如α-甲基苯乙烯 (α-methylstyrene);鹵化苯乙烯(halogenated styrene)，例如 氯苯乙烯（chlorostyrene);以及乙烯基苯乙烯（vinyl styrene)。此外，視需要而定，亦可使用二種或是多種苯乙 烯單體的組合物。 2〇 特別是，當使用苯乙烯-丙烯酸共聚物樹脂時’考慮到 對該基層的黏著力，丙烯酸單體與苯乙烯單體進行共聚合 反應的比例範圍自6比4至1比9。 本發明的光擴散板可進一步包括一圖形層，係位於該 光擴散板的至少一表面上。該圖形層係用以在改善遮蔽性 [S3 14 質的同時，維持適當的亮度。 心示’圖形層具有複數個圖形，且 形狀；或是剖面為多角^二;或半搞圓形的多面體 5或者是，可應用一種:夕+回:或+_形的柱體形狀； , 裡及疋夕種形狀的組合物。並且，這此 圖形：各自彼此相鄰或不相鄰的排列。 、- 气板括一基層與一表層的光擴散板，該光擴 月 v匕括由複數個剖面為半圓形的柱體，線性地 排列於該表層之-表面上，所組成的一圖形層。 10所顯不的光擴散板，其圖形層係由複數個以預定間距排 列，且剖面為半圓形的柱體所組成。第三圖所顯示的光擴 散板’其圖形層係由複數個以預定間距排列，且剖面為修 飾過之半圓形的柱體所組成。第四圖所顯示的光擴散板， 其圖形層係由複數個以預定間距排列，且剖面為錐形四面 15體所組成。 如此一來，該圖形層係進一步形成於該基層且/或該表 層上，致使光行經路徑可被控制，且擴散後的光被傳輸至 前表面，從而維持適當地亮度以及提昇遮蔽光源影像的能 力。 20 依據本發明的實施例’光擴散板的總透光度等於或高 於40% ’且1^度等於或高於4500 cd/mm2。 在符合此總透光度與亮度的情況下，光擴散板具有優 異的遮蔽性質與適當的亮度，因而可應用於大面積LCD的 背光模組’進而有效地遮蔽光源的影像。 15 1378269 雖然本發明配合圖式，如上述般的揭露，然而，這些 圖式僅用以敌述本發明，而不應解釋為限制本發明，且熟 習此項技術領域者，在不違反本發明的技術精神下所從事 的各種修飾與變化，皆屬於本發明的範嘴。 5 當光擴散板包括形成於該基層之一表面或是二表面上 的表層時，該表層係藉由進行諸如共擠壓模製、層疊、埶 黏著或是表面塗覆等習知的加工製程，形成於該基層上。 當光擴散板包括該圖形層時，該圖形層係藉由進行諸 如層疊、熱黏著、滾轉印、膜轉印、壓轉印或是印刷等習 10 知的加工製程，予以形成。 此外，本發明提供一種光擴散板，符合適當的遮蔽性 質與高亮度，並大幅地減少光學薄膜的使用，且縱使在缺 乏圖形層的條件下，仍可達到前述的特性。 此處所使用之基底樹脂、透過額外形成表層的多層結 15構、以及該表層的特定組成，皆如前述所定義者。 在此例令’光擴散板的霧度等於或低於90%，且總透 光度等於或高於80%，並且，該光擴散板展現出適當的遮 蔽性質與高亮度，也因此可減少額外使用光學薄膜的數 量。特別是，該擴散板可非常有用地作為用於具有適當面 2〇積之背光模組的擴散膜。 視需求而定，為了進一步提高遮蔽性質與增加亮度， 可進一步提供前述的圖形層。 本發明之光擴散板的實施例中，可使用一種光擴散 劑。該光擴散劑的折射率通常不同於該基底樹脂的折射 1378269 率，且係用以增加光的擴散率，並負責給予適當的遮蔽性 質、透光度以及擴散性質。 該光擴散劑包括各種有機與無機粒子。有機粒子的典 型範例包括丙烯酸聚合物粒子，諸如曱基丙烯酸曱酯 5 (methylmethacrylate)、曱基丙烯酸乙酉旨(ethylmethacrylate)、 曱基丙烯酸異丁酯（isobutylmethacrylate)、甲基丙烯酸正丁 S旨（n-butylmethacrylate)、甲基丙烯酸正丁基曱醋 (n-butylmethylmethacrylate)、丙烯酸(acrylic acid)、曱基丙 烯酸（methacrylic acid)、甲基丙稀酸經乙酯 ίο (hydroxyethylmethacrylate)、曱基丙稀酸經丙酯 (hydroxypropylmethacrylate)、 丙稀酸羥乙酯 (hydroxyethylacrylate)、丙烯醯胺(acryl amide)、羥曱基丙烯 醯胺(methylol acryl amide)、曱基丙烯酸環氧丙酯(giyddyi methacrylate)、丙烯酸乙g旨（ethyiacrylate)、丙晞酸異丁西旨 15 (is〇butylacrylate)、丙烯酸正丁醋(n七utyiacryiate)、丙稀酸 2-乙基己酯(2-ethylhexylacrylate)、以及其聚合物、共聚物 或二聚物；笨乙烯聚合物粒子，諸如苯乙烯、被取代的笨 乙烯、以及其聚合物、共聚物或三聚物；烯烴聚合物粒子， 諸如聚乙烯以及聚丙烯；丙烯與苯乙烯共聚物粒子；丙烯 2〇與烯烴共聚物粒子；苯乙烯與烯烴共聚物粒子；多層多成 分粒子，係藉由先形成均聚物、共聚物或三聚物粒子，之 後再以其它類型的單體將其覆蓋而得；秒氧说聚合物粒 子；以及氟樹脂粒子。 無機粒子的範例包括碳酸辦、硫酸鋇、氧化砍、氣氧 17 、乳化鈇、氧化錯、氟化鎂、滑石、玻璃、以及雲母。 有機粒子的光擴散性質優於無機粒子的錢散性質，旅 且視二求而疋’可使用二種或是多種的光擴散劑組合物。 田光擴月欠劑與基底樹脂之間的折射率差異很大時，縱 …、僅使用）里的光擴散劑’仍然可展現出光擴散效應。相 反地’虽光擴散猶基底樹脂之間的折料差異很小時， 則必須使用相對大量的光擴散劑。 一般，當光擴散劑的用量增加時，亮度也被認為會增 加。然而，當光擴散劑的用量過多時，亮度反而會降低。 因此，光擴散劑的用量係被調整為使光擴散板可展現出適 當的遮蔽性質與高亮度。 光擴散板的遮蔽性質與亮度，係可透過單獨使用，或 是組合使用下列各種方法予以調整。 第一種方法包括，在考慮到基底樹脂與光擴散劑之間 折射率差異的情形下，調整光擴散劑的用量；第二種方法 包括，在光擴散板為多層結構的情形下，調整基層與表層 之光擴散劑的含量；第三種方法包括調整光擴散劑的類 型；以及第四種方法包括調整光擴散劑的尺寸。 舉例來說，以100重量份的基底樹脂為基準，當光擴 散劑的用量等於或低於10重量份時，可製造出霧度等於或 低於90% ’且總透光度專於或兩於go%的光擴散板。當進 一步提供圖形層時，總透光度會進一步降低，進而增加遮 蔽性質與顯現適當的亮度。 當光擴散劑用於表層時，光擴散劑的量必須隨著用於 1378269 * 表層之基底樹脂的折射率，與基層之光擴散劑的量而改 * 變，並且，以100重量份之用於表層的該基底樹脂為基準， 用於表層之光擴散劑的量可被設定為等於或少於20重量 份。 .5 光擴散劑的粒徑可等於或小於100 μιη。 此外，視需求而定，本發明之光擴散板可進一步添加 有製程穩定劑（process stabilizer)、紫外線吸收劑（υν > absorber)、或是紫外線穩定劑(UV stabilizer)。 透過以下實施例將更加瞭解本發明，然而，下列實施 10 例僅用以敘述本發明’而不應解釋為限制本發明。 實施例1至12 實施例1至12的組成成分與組成比例顯示於下表1。 所使用的聚碳酸酯樹脂’在300°C以及荷重1.2公斤的 條件下，依據ASTMD1238定義出的熔融指數(mi)為每1〇 15 分鐘 22 克(22 g/10 min)。 | 在這些實施例中，例如基底樹脂，當聚碳酸酯與聚苯 乙烯以混合物的形式使用時，係以表丨所顯示的組成比例 加入，之後再使用雙螺桿擠壓機在25〇°C下將其熔融混合 之。 20 所使用之聚苯乙烯樹脂，在200〇C以及荷重5公斤的 條件下，依據ASTMD1238定義出的熔融指數(MI)為每忉 分鐘 1.5 克（1.5 g/l〇 min)。 用於表層的基底樹脂方面，是使用表丨組成成分中之 典型的苯乙烯-丙烯酸共聚物樹脂。 [S] 1378269 在光擴散板的組成成分中，該基層是由表1組成成分 中的一基底樹脂與一光擴散劑所組成，且以0.5重量份之紫 外線吸收劑，例如苯亞曱基丙二酸鹽 (tetraethyl-2,25 -(1,4-pheny lene-dimethylidene)-bismalonate, 5 B-Cap)作為光穩定劑；該表層是由表1組成成分中的一基 底樹脂與一光擴散劑所組成，且以2重量份之紫外線吸收 劑’例如苯亞甲基丙二酸鹽 (tetraethyl-2,2? -(1,4-pheny lene-dimethylidene)-bismalonate, B-Cap)作為光穩定劑。 10 該圖形層位於該光擴散板的上表面（如第一圖所示）， 是透過滾筒塗佈形成複數個寬度(a)為150 μιη且高度(b)為 75 μιη之剖面為半圓形的柱體所組成。 具體而言，實施例丨至4有關於一種沒有表層之單層 ’纟#構的擴散板；實施例5至8有關於—種包括有基層與形 15成於δ亥基層一表面上之表層的擴散板；以及實施例9至 有關於-種包括具有與實施例5至8相同組成成分之基層 與表層的擴散板，除了該表層係形成於該基層的二個表面 上。 模製方面，疋使用直徑為135 mm與6〇 mm的單螺桿 2〇押出機’在模製溫度25〇〇c與22〇〇c下進行共擠壓。在實 施例/至4 _，該基層的厚度為2 〇 mm ;在實施例5至8 中’邊，層的厚度為L9 _，且該表層的厚度為〇」麵； 、及在貫施例9至12中，該基層的厚度為丨8 mm，且在該 基層一個表面上之該表層的厚度各為 0.1 mm。 m 20 1378269 【表1】 實施 例 基層（重量份） 表層（重量份） 圖形 層 PC PS mm樹脂顆粒 MS MM樹脂顆粒 1 800 200 1 - - X 2 200 800 1 - - X 3 800 200 1 - - 〇 4 200 800 1 - 〇 5,9 800 200 - 100 7 X 6, 10 200 800 - 100 7 X 7, 11 800 200 - 100 7 〇 8, 12 200 800 - 100 7 〇 ' 八 ' /山必升、公7 不U入//¾压视」, *PS·聚本乙缔，東洋笨乙稀株式會社(T〇y〇 Styrene);型號HRM40 氺MS:苯乙烯-丙烯酸酯共聚物樹脂；日本鋼鐵化學公司（Ν.〇η Steel Chemical);型號MS600a base resin formed by the substrate; a surface layer formed on one surface of the base layer; and a pattern layer formed on at least one surface of the surface layer. The light-diffusing sheet of the third embodiment of the present invention is selected from the group consisting of polycarbonate resin, and the total light transmittance of the light-diffusing diffusing plate is equal to or higher than 4% by weight and the brightness is 45 cd/mm 2 °. A styrene tree formed by a polystyrene resin, and a mixture thereof. The light diffusing plate has a haze of 9 % or less and a total light transmittance of 80% or more. A light diffusing plate according to a fourth embodiment of the present invention comprises a base layer formed of a base resin selected from the group consisting of polycarbonate resin, polystyrene resin, and a mixture thereof: 1378269; and a surface layer formed On at least one surface of the base layer. The light diffusing plate has a haze of equal to or lower than 9% by weight and a total light transmittance of equal to or higher than 80%. The light diffusing plates of the first to fourth embodiments of the present invention may further comprise a light diffusing agent having a particle diameter of less than or less than 1 μm. In the light diffusing plate of the first to fourth embodiments of the present invention, the light diffusing agent may be one or more selected from the group consisting of: acryllcpolymer particles; styrene Styrene polymer particles; (olefin polymer pamc^es), propylene and styrene copolymer particles; propylene and olefin copolymer particles granules; her multi-layer and multi-component are good, a polymer, a copolymer or a terpolymer particle, which is then covered with other types of rock mountains = carbonic acid particles; fluororesin particles; 15 urgent particles, barium sulfate particles; cerium oxide particles; Aluminum particles; particles, cerium oxide particles; magnesium fluoride particles; talc particles; glass particles; and mica. Further, the light diffusing plate of the second embodiment and the fourth embodiment may be further formed into a pattern layer formed on at least one surface of the light diffusing plate. In the light diffusing plates of the first to fourth embodiments, the drawing includes: a plurality of cross-sections having a polygonal, semi-circular or semi-elliptical shape; or a cross section An angular, semi-circular or semi-elliptical cylinder shape, v. day, 0 r~nk patterns may be adjacent to each other or not adjacent. - 7 = 七明第 - In the light diffusing plate of the fourth to fourth embodiments, the polymer resin may have a glass transition temperature equal to or higher than 10 〇 5 〇 c. 20 1378269 In the light diffusing plates of the first to fourth embodiments of the present invention, the polystyrene resin may be a polystyrene resin in which acrylic acid is copolymerized. According to one aspect of the present invention, the light diffusing plate can exhibit sufficient brightness of 5 degrees and excellent shielding properties, so that the light diffusing plate can be sufficiently shielded even when applied to a backlight module having a large screen. The image of the light source, and the dimensional stability of the light diffusing plate is high, so that curling rarely occurs even in a high temperature and high humidity environment. Further, according to another aspect of the present invention, the light diffusing plate has a high total transmittance of 10 and a high enough brightness to maintain good light emission quality. Therefore, the light diffusing plate reduces the use of the optical film, thereby reducing the manufacturing cost thereof, and further, the light diffusing plate has high dimensional stability, so that curling rarely occurs even in a high temperature and high humidity environment. 15 is a perspective view showing a diffusing plate according to a first embodiment of the present invention; the second drawing is a perspective view showing a diffusing plate according to a second embodiment of the present invention; and the second drawing is a perspective view showing the present The diffusing plate of the third embodiment of the invention; and '2' is a perspective view showing the diffusing plate of the fourth embodiment of the present invention. <Description of Component Symbols Used in the Drawing> 10 Base Layer 20 Surface Layer 30, 40, 50, 60 Pattern Layer 1378269 [Embodiment] Hereinafter, the present invention will be described in detail. The present invention provides a light diffusing plate having a single layer structure or a multilayer structure, which exhibits appropriate brightness and excellent shielding properties. The light diffusing plate 5 is formed of a base resin comprising a polycarbonate resin and a polystyrene resin; the above-mentioned polycarbonate resin and polystyrene resin may be used singly or in combination. Polycarbonate resin has excellent impact resistance and light transmittance, as well as good low temperature and electrical properties, and has high temperature resistance and absorption resistance, so its dimensional stability is very high. Therefore, polycarbonate resins can be used in a wide temperature range, and are thus applied to optical lenses, optical disk materials, hard hats, protective devices, and coverings. The polycarbonate resin used in the present invention t includes a reaction of dihydroxy phenol with phosgene or a reaction of a dihydric phenol with a 15 carbonate precursor, such as a typical one. Aromatic polycarbonate resins, linear and branched carbonate homopolymers, polyester copolymers, and mixtures thereof. Examples of dihydric phenols include 2,2-bis(4-hydroxyphenyl)propane (ie, double S sub-A) (2,2-bis(4-hydroxyphenyl)propane, bisphenol A), bis(4-hydroxybenzene) Bismuth (bis(4-hydroxyphenyl)methane), 2,2-bis(4-hydroxy-3,5-diamidinophenyl)propane (2,2-bis(4-hydroxy-3, 5-dimethylphenyl) propane), and 1,1-bis(4-hydroxyphenyl)cyclohexane; and examples of carbonate precursors include diphenyl carbonate Diphenyl carbonate, a group of halides [S] 1378269 (carbonyl halide), and diaryl carbonate. The polycarbonate resin used in the present invention has a melt index (MI) defined by ASTM D1238 of 7 to 30 g per 10 minutes at 3 ° C and a load of 1.2 kg (7~). 3〇g/i〇min) 〇5 In terms of the base resin, when the polystyrene resin is used alone, an example having a glass transition temperature of 105 ° C or higher can be used to increase the heat recovery; and, The polystyrene resin in which the acrylic acid is in a copolymerized form. Since the polystyrene resin is rigid, colorless and transparent, and has good electrical properties of 10, and because it can be mass-produced, it is inexpensive, and is therefore used in various fields, including daily necessities, such as temple parts, stationery. Materials and furniture; large molded parts for machinery; and electrical equipment (electrochemical products) such as TV sets. In the case of the base resin, when a mixture of a polycarbonate resin and a polystyrene resin is used, it can be used at 200. (: and a load of 5 kg, the melt index (mi) defined in accordance with ASTM D1238 is 0-5 to 3 g (0.5 to 3 g/l〇min) of polystyrene resin per 10 minutes. When a mixture of polycarbonate resin and polystyrene resin is used, it can be a twin screw extruder with a diameter of 30 mm, at a motor speed of 25 rpm, and a molding temperature of 2 〇〇 to 3 〇. 〇〇c, preferably melt-mixed at 250 ° C. When the polycarbonate resin is mixed with a polystyrene resin, in order to achieve flexibility and dimensional stability of the poly stone vinegar resin The advantages, as well as the resistance of the polystyrene resin (the advantage of the strength and strength, the weight ratio of the two can be mixed) [S] 13 1378269 to 9 to 9 to 1. Alternatively, the light diffusing plate of the present invention can be A multilayer structure comprising a base layer and a surface layer on one or both surfaces of the base layer. 5 The composition of the surface layer is not particularly limited, and, for example, a base resin for the surface layer includes By copolymerizing acrylic monomers with styrene A styrene-acrylic copolymer resin obtained as a monomer. As a useful monomer, the acrylic monomer includes one or more selected from the group consisting of methacrylie acid alkyl ester, ίο acrylic acid. Acrylic acid alkyl ester, methacrylic acid cycloalkyl ester, acrylic acid cycloalkyl ester, methacrylic acid aryl ester, and acrylic acid aryl ester g (aerylie acid ary 1 ester); and styrene monomer * includes styrene or substituted styrene. The above substituted styrene package I5 includes alkyl styrene, such as α-A Α-methylstyrene; halogenated styrene, such as chlorostyrene; and vinyl styrene. Further, two or more kinds may be used as needed. A composition of a styrene monomer. In particular, when a styrene-acrylic copolymer resin is used, 'in view of the adhesion to the base layer, the acrylic monomer and the styrene monomer are Copolymerization ratio ranges from 6 to 4 to 1 on the ratio of the light diffusing plate 9. The present invention may further comprise a graphic layer, the light diffusion plate system located at least one surface. The graphic layer is used to maintain proper brightness while improving the shielding properties. The heart indicates that the 'graphic layer has a plurality of shapes and shapes; or the cross-section is a multi-angle ^ two; or a semi-circular polyhedron 5 or, a type of: 夕+回: or +_-shaped cylinder shape can be applied; A composition of the shape of the inside and the evening. And, this figure: an arrangement that is adjacent to each other or not adjacent to each other. - the gas plate comprises a base layer and a surface light diffusing plate, the light diffusing v includes a plurality of columns having a semicircular cross section, linearly arranged on the surface of the surface layer, and a graphic formed by the gas plate Floor. The 10 visible light diffusing plates are composed of a plurality of columns arranged at a predetermined pitch and having a semicircular cross section. The light diffusing plate shown in the third figure has a pattern layer composed of a plurality of columns arranged at a predetermined pitch and having a semicircular cross section. The light diffusing plate shown in the fourth figure is composed of a plurality of pattern layers arranged at a predetermined pitch and having a tapered four-faced body. In this way, the pattern layer is further formed on the base layer and/or the surface layer, so that the light path can be controlled, and the diffused light is transmitted to the front surface, thereby maintaining proper brightness and enhancing the image of the shadow source. ability. 20 According to an embodiment of the present invention, the total light transmittance of the light diffusing plate is equal to or higher than 40% ' and 1^ degrees is equal to or higher than 4500 cd/mm 2 . In accordance with the total transmittance and brightness, the light diffusing plate has excellent shielding properties and appropriate brightness, and thus can be applied to a large-area LCD backlight module' to effectively shield the image of the light source. The present invention is not intended to limit the invention, and is not intended to limit the invention, and is not inconsistent with the present invention. The various modifications and variations made by the technical spirit belong to the scope of the present invention. 5 When the light diffusing plate includes a surface layer formed on one surface or both surfaces of the base layer, the surface layer is subjected to a conventional processing process such as co-extrusion molding, lamination, adhesive bonding or surface coating. Formed on the base layer. When the light diffusing plate includes the pattern layer, the pattern layer is formed by a conventional processing such as lamination, heat bonding, roll transfer, film transfer, pressure transfer or printing. Further, the present invention provides a light diffusing plate which conforms to appropriate shielding properties and high brightness, and which greatly reduces the use of an optical film, and can achieve the aforementioned characteristics even in the absence of a pattern layer. The base resin used herein, the multilayer structure through which the surface layer is additionally formed, and the specific composition of the surface layer are as defined above. Here, the haze of the light diffusing plate is equal to or lower than 90%, and the total light transmittance is equal to or higher than 80%, and the light diffusing plate exhibits appropriate shielding properties and high brightness, and thus can be reduced. The number of additional optical films used. In particular, the diffuser can be very useful as a diffuser film for a backlight module having a suitable surface 2 accumulation. Depending on the requirements, in order to further improve the shielding properties and increase the brightness, the aforementioned pattern layer may be further provided. In the embodiment of the light diffusing plate of the present invention, a light diffusing agent can be used. The refractive index of the light diffusing agent is generally different from the refractive index of the base resin by 1378269, and is used to increase the diffusivity of light and is responsible for imparting appropriate masking properties, light transmittance, and diffusion properties. The light diffusing agent includes various organic and inorganic particles. Typical examples of the organic particles include acrylic polymer particles such as methylmethacrylate, ethylmethacrylate, isobutylmethacrylate, and butyl methacrylate. -butylmethacrylate), n-butylmethylmethacrylate, acrylic acid, methacrylic acid, methyl acrylate, hydroxyethylmethacrylate, mercapto acrylate Hydroxypropylmethacrylate, hydroxyethylacrylate, acryl amide, methylol acryl amide, giyddyi methacrylate, acrylic acid Ethyiacrylate, is〇butylacrylate, n-butyl acrylate (n7 utyiacryiate), 2-ethylhexylacrylate, and polymers thereof , copolymer or dimer; stupid ethylene polymer particles, such as styrene, substituted stupid ethylene, and polymers, copolymers or tris thereof Polymer; olefin polymer particles, such as polyethylene and polypropylene; propylene and styrene copolymer particles; propylene 2 fluorene and olefin copolymer particles; styrene and olefin copolymer particles; multi-layer multi-component particles, formed by Homopolymer, copolymer or terpolymer particles, which are then covered with other types of monomers; second oxygen polymer particles; and fluororesin particles. Examples of inorganic particles include carbonated, barium sulfate, oxidized chopped, gaseous oxygen, emulsified oxime, oxidized, magnesium fluoride, talc, glass, and mica. The light diffusing properties of the organic particles are superior to those of the inorganic particles, and it is possible to use two or more kinds of light diffusing agent compositions. When the refractive index difference between the Tianguang expansion agent and the base resin is large, the light diffusing agent in the longitudinal direction and the use of the light diffusing agent can still exhibit a light diffusion effect. In contrast, although the light diffusion is small when the difference in the material between the base resins is small, a relatively large amount of the light diffusing agent must be used. Generally, when the amount of the light diffusing agent is increased, the brightness is also considered to increase. However, when the amount of the light diffusing agent is too large, the brightness is rather lowered. Therefore, the amount of the light diffusing agent is adjusted so that the light diffusing plate can exhibit appropriate shielding properties and high brightness. The shielding properties and brightness of the light diffusing plate can be adjusted by using them alone or in combination using the following various methods. The first method includes adjusting the amount of the light diffusing agent in consideration of a difference in refractive index between the base resin and the light diffusing agent; and the second method includes adjusting the base layer in the case where the light diffusing plate has a multilayer structure The content of the light diffusing agent with the surface layer; the third method includes adjusting the type of the light diffusing agent; and the fourth method includes adjusting the size of the light diffusing agent. For example, when the amount of the light diffusing agent is 10 parts by weight or less based on 100 parts by weight of the base resin, a haze of 90% or less can be produced and the total light transmittance is specific to or two. On go% of the light diffuser. When the pattern layer is further provided, the total light transmittance is further lowered, thereby increasing the masking property and exhibiting an appropriate brightness. When a light diffusing agent is used for the surface layer, the amount of the light diffusing agent must be changed with the refractive index of the base resin for the surface layer of 1378269*, and the amount of the light diffusing agent of the base layer, and used for 100 parts by weight. The amount of the light diffusing agent for the surface layer may be set to be equal to or less than 20 parts by weight based on the base resin of the surface layer. .5 The light diffusing agent may have a particle diameter of 100 μm or less. Further, the light diffusing plate of the present invention may be further added with a process stabilizer, an ultraviolet absorber (υν > absorber), or a UV stabilizer depending on the demand. The invention will be more apparent from the following examples, however, the following examples of the invention are merely intended to illustrate the invention and should not be construed as limiting the invention. Examples 1 to 12 The composition and composition ratios of Examples 1 to 12 are shown in Table 1 below. The polycarbonate resin used was at a temperature of 300 ° C and a load of 1.2 kg, and the melt index (mi) defined in accordance with ASTM D1238 was 22 g (22 g/10 min) per 15 minutes. In these examples, for example, a base resin, when polycarbonate and polystyrene are used in the form of a mixture, is added in the composition ratio shown in Table ,, and then a twin-screw extruder is used at 25 ° C. It is melted and mixed underneath. 20 The polystyrene resin used has a melt index (MI) of 1.5 g per minute (1.5 g/l〇 min) at 200 °C and a load of 5 kg, according to ASTM D1238. The base resin used for the surface layer is a typical styrene-acrylic copolymer resin which is used in the composition of the surface. [S] 1378269 In the composition of the light diffusing plate, the base layer is composed of a base resin and a light diffusing agent in the composition of Table 1, and is 0.5 parts by weight of a UV absorber such as phenylarylene. Diethylate (tetraethyl-2,25-(1,4-pheny lene-dimethylidene)-bismalonate, 5 B-Cap) as a light stabilizer; the surface layer is a base resin and a light diffusion in the composition of Table 1. The composition is composed of 2 parts by weight of a UV absorber, such as tetraethyl-2,2?-(1,4-pheny lene-dimethylidene-bismalonate, B-Cap) stabilizer. 10 The pattern layer is located on the upper surface of the light diffusing plate (as shown in the first figure), and is formed by a plurality of widths (a) of 150 μm and a height (b) of 75 μm by a roller coating. The composition of the cylinder. Specifically, the embodiments 丨 to 4 relate to a single-layered diffusion plate having no surface layer; and the embodiments 5 to 8 relate to a surface layer including a base layer and a shape 15 formed on a surface of the δ hai base layer. A diffusing plate; and Embodiment 9 to a diffusing plate comprising a base layer and a skin layer having the same composition as those of Embodiments 5 to 8, except that the surface layer is formed on both surfaces of the base layer. For molding, 疋 was co-extruded at a molding temperature of 25 ° C and 22 ° C using a single screw 2 〇 extruder of 135 mm and 6 〇 mm in diameter. In the embodiment / to 4 _, the thickness of the base layer is 2 〇 mm; in the embodiments 5 to 8, the thickness of the layer is L9 _, and the thickness of the surface layer is 〇" face; In 9 to 12, the thickness of the base layer is 丨 8 mm, and the thickness of the surface layer on one surface of the base layer is 0.1 mm each. m 20 1378269 [Table 1] Example base layer (parts by weight) Surface layer (parts by weight) Pattern layer PC PS mm resin particles MS MM resin particles 1 800 200 1 - - X 2 200 800 1 - - X 3 800 200 1 - - 〇4 200 800 1 - 〇5,9 800 200 - 100 7 X 6, 10 200 800 - 100 7 X 7, 11 800 200 - 100 7 〇8, 12 200 800 - 100 7 〇' 八' / 山必升, public 7 is not U into / / 3⁄4 glance", * PS · Polybenz, Toyo Styrene Co., Ltd. (T〇y〇 Styrene); model HRM40 氺MS: styrene-acrylate copolymer resin; Japan Steel Chemical Company (Ν.〇η Steel Chemical); model MS600
* MM樹脂顆粒：甲基丙烯酸甲酯樹脂顆粒；韓國可隆公司 (Kolon);型號M-10P 量測該等實施例所製得之光擴散板的總透光度、霧 度、亮度、捲曲度、吸水性以及熱變形溫度。測量結果顯 示於下表2。 5 依據ASTM D1003測量總透光度與霧度，並使用由美 樂達(Minolta)所取得之LS-100測量亮度。 捲曲度的定義是將擴散板裝設於20吋的背光模組上， 之後使其處於60°C以及相對濕度75%的條件下96小時， 而後測量擴散板向上捲曲的四個角落與背光模組表面之間 10的距離。吸水性的定義則是將光擴散板裁切成10平方公分 的尺寸’之後使其處於25°C的水中24小時，而後測量光 擴散板的重量變化。依據ASTM D648測量光擴散板的熱變 LG-陶氏(LG Dow);型號Calibre 300-22 [S3 1378269 形溫度。 【表2】 實施 總透光度 霧度 免度 捲曲度 吸水性 熱變f 例 (%) (%) (cd/m2) (mm) (%) 溫度(°c) 1 92.1 75.0 4864 0.20 0.19 123.1^ 2 91.9 79.0 4789 0.14 0.14 101.广 3 91.4 77.0 5771 0.21 0.20 121.9^~ 4 90.1 81.0 5649 0.15 0.16 ~ ΙΟΟ.'Γ' 5 93.1 75.3 4971 0.20 0.18 6 93.9 75.9 4923 0.15 0.13 ~~We~~~ 7 93.9 78.1 5917 0.21 0.19 ~ 118ΓΡ~ 8 93.6 77.9 5896 0.17 0.14 98.9 9 94.4 77.4 5071 0.18 0.17 ~~ϊΤμ^ 10 94.1 78.1 5050 0.13 0.12 97.6 11 94.1 79.6 6005 0.20 0.17 —115.广 12 94.5 79.1 Γ5967 0.16 0.13 97.0^ 由表2可以清楚得知，所有實施例的光擴散板，都具 有等於或高於90%之非常高的總透光度以及優異的亮度。 5此外，其尺寸穩定性亦非常高。特別是，相較於其它沒有 丨圖形層的光擴散板，具有圖形層的實施例3' 4、7、8、11 以及12具有較高的亮度。相較於基層之PC使用量多於Ps 使用量的光擴散板，基層之PS使用量多於PC使用量的實 施例2、4、6、8、10與12展現出較低的吸水性與熱變形 10 溫度；此外，實施例2、4、6、8、10與12的捲曲度亦才目 對地降低。 測量實施例1、2、5、6、9以及10遮蔽燈管的能力。 具體而言，將光擴散板裝設於24吋的背光模組上，之後， 將擴散膜、稜鏡膜以及反射偏光膜依序地裝設於其上，而 i S] 22 後以肉眼sf估燈管的影像能否被看見。無法看見燈管影像 的實施例定義為良好，而能夠看見燈管影像的實施例定義 為不良。結果顯示，光擴散板遮蔽燈管的能力良好。 測量具有圖形層之實施例3、4、7、8、11以及12的 5光擴散板遮蔽燈管的能力。具體而言，將光擴散板裝設於 32吋的背光模組上，之後，將擴散膜、稜鏡膜以及反射偏 光臈依序地裝設於其上，而後以肉眼評估燈管的影像能否 被看見。無法看見燈管影像的實施例定義為良好，而能夠 看見燈管影像的實施例定義為不良。結果顯示，光擴散板 1〇 遮蔽燈管的能力良好。 實施例13至18 光擴散板是以與實施例1至12相同的方式製造，並製 造成相同的尺寸，除了僅使用其内之丙稀酸為部分共聚合 形態之聚笨乙烯樹脂（玻璃轉移溫度ll5〇c)，作為基層的 15基底樹脂’且在實施例15與16中’表層係形成於基層的 一表面上，以及在實施例17與18中，表層係形成於基層 的一個表面上之外。 實施例13至18之光擴散板的具體組成，係顯示於下 列表3中。 ί S3 23 1378269* MM resin particles: methyl methacrylate resin particles; Kolon, Korea; model M-10P. Measure the total transmittance, haze, brightness, and curl of the light diffusing plate prepared in the examples. Degree, water absorption and heat distortion temperature. The measurement results are shown in Table 2 below. 5 Measure total light transmittance and haze according to ASTM D1003, and measure brightness using LS-100 obtained by Minolta. The degree of curl is defined by mounting the diffuser on a 20-inch backlight module, then placing it at 60 ° C and 75% relative humidity for 96 hours, and then measuring the four corners of the diffuser plate that are curled upwards and the backlight mode. The distance between the groups of 10 is 10 . The water absorption property was defined by cutting the light diffusing plate into a size of 10 cm 2 and then allowing it to stand in water at 25 ° C for 24 hours, and then measuring the change in weight of the light diffusing plate. Measurement of thermal change of light diffusing plate according to ASTM D648 LG-Dow (LG Dow); model Calibre 300-22 [S3 1378269 temperature. [Table 2] Implementation of total transmittance, haze, degree of curl, water absorption, heat change, f (example) (%) (cd/m2) (mm) (%) temperature (°c) 1 92.1 75.0 4864 0.20 0.19 123.1 ^ 2 91.9 79.0 4789 0.14 0.14 101. Wide 3 91.4 77.0 5771 0.21 0.20 121.9^~ 4 90.1 81.0 5649 0.15 0.16 ~ ΙΟΟ.'Γ' 5 93.1 75.3 4971 0.20 0.18 6 93.9 75.9 4923 0.15 0.13 ~~We~~~ 7 93.9 78.1 5917 0.21 0.19 ~ 118ΓΡ~ 8 93.6 77.9 5896 0.17 0.14 98.9 9 94.4 77.4 5071 0.18 0.17 ~~ϊΤμ^ 10 94.1 78.1 5050 0.13 0.12 97.6 11 94.1 79.6 6005 0.20 0.17 —115. Wide 12 94.5 79.1 Γ5967 0.16 0.13 97.0^ As is clear from Table 2, the light diffusing plates of all of the examples had a very high total transmittance equal to or higher than 90% and excellent brightness. In addition, its dimensional stability is also very high. In particular, Examples 3'4, 7, 8, 11, and 12 having a pattern layer have higher brightness than other light diffusing sheets having no enamel pattern layer. Compared with the light diffusing plate in which the amount of PC used in the base layer is more than the amount of Ps used, Examples 2, 4, 6, 8, 10 and 12 in which the PS usage of the base layer is more than the amount of PC used exhibits lower water absorption and The heat distortion 10 temperature; in addition, the curling degrees of Examples 2, 4, 6, 8, 10 and 12 were also reduced objectively. The ability of Examples 1, 2, 5, 6, 9, and 10 to shield the lamp was measured. Specifically, the light diffusing plate is mounted on the 24 背光 backlight module, and then the diffusion film, the ruthenium film, and the reflective polarizing film are sequentially mounted thereon, and i S] 22 is followed by the naked eye sf Estimate whether the image of the tube can be seen. An embodiment in which the lamp image cannot be seen is defined as good, and an embodiment in which the lamp image can be seen is defined as defective. The results show that the light diffusing plate has a good ability to shield the tube. The ability of the 5 light diffusing plates of Embodiments 3, 4, 7, 8, 11 and 12 of the pattern layer to shield the lamps was measured. Specifically, the light diffusing plate is mounted on the 32-inch backlight module, and then the diffusion film, the germanium film, and the reflective polarizing film are sequentially mounted thereon, and then the image energy of the lamp tube is visually evaluated. No to be seen. An embodiment in which the lamp image is invisible is defined as good, and an embodiment in which the lamp image can be seen is defined as poor. The results show that the light diffusing plate has a good ability to shield the lamp. Examples 13 to 18 Light-diffusing sheets were produced in the same manner as in Examples 1 to 12, and were fabricated in the same size except that only the acrylic acid in which the acrylic acid was used was a partially copolymerized form of a polystyrene resin (glass transition temperature) Ll5〇c), as a base layer of 15 base resin 'and in Examples 15 and 16 'the surface layer is formed on one surface of the base layer, and in Examples 17 and 18, the surface layer is formed on one surface of the base layer outer. The specific compositions of the light diffusing plates of Examples 13 to 18 are shown in Table 3 below. ί S3 23 1378269
【表3】 實施例 基， ¥ C重量份） 表層（重量份） 圖形層 PS 應樹月 MS M1V[樹脂顆粒 13 1000 —：— - X 14 1000 1 - 〇 15, 17 1000 —_ 100 7 X 16, 18 Ίόόό1 100 7 〇 *PS :聚苯乙烯，果洋苯乙 *MS :苯乙烯-丙烯酸酯共聚物] Steel Chemical);型號MS6〇〇 * MM樹脂顆粒.曱基丙歸妒 (Kolon);型號M-10P 次 民會社( 封脂； 甲酯樹 Toyo Styrene) ； % 日本鋼鐵化學公έ 脂顆粒；韓國 號 Τ080 ](Nippon Γ隆公司 量測以此所獲得之光擴散板的總透光度、霧度、亮度、[Table 3] Example base, ¥ C parts by weight) Surface layer (parts by weight) Pattern layer PS should be tree month MS M1V [Resin particles 13 1000 —: — — X 14 1000 1 - 〇 15, 17 1000 —_ 100 7 X 16, 18 Ίόόό1 100 7 〇*PS: polystyrene, citric acid benzene*MS: styrene-acrylate copolymer] Steel Chemical); model MS6〇〇* MM resin granules. lon基丙归妒 (Kolon) Model M-10P Sublimation Society (seal; methyl ester tree Toyo Styrene); % Japan Steel Chemical Co., Ltd. Grease granules; Korea Τ 080] (Nippon Qianlong Company measured the total penetration of the light diffusing plate obtained by this Luminosity, haze, brightness,
捲曲度、吸水性以及熱變形溫度。測量結果顯示於下表4。 【表4】 實施 例 總透光度 (%) 霧度 (%) 亮度 (cd/m2) 捲曲度 (mm) 吸水性 (%) 熱變形 溫廑i0C) 13 88.4 75.8 79.5 ^5621 0.15 0.16 __0Λ6_ Γ〇πτ~ 110.2 ^Π0.1 ^ 15 1 /r 90.1 76.4 _4816 0.15 0.15 109 8 Ιο ____90.5 79.6 ^746 〇 16 _〇Λ7 〇 Π 109.4 110 3 17 1 Q ___90.3 77.8 ^953 0.17 1 ο _____90.8 78.6 _5865_ 0.16 0.16 109.9 J从，月a，隹早獨便用符合預定熱性質之 ‘本乙烯樹脂的實施例中’總透光度、霧度以及捲曲度並 殳有改灸，且尺寸穩定性與使用聚碳酸酯樹脂與聚笨乙烯 樹脂混合物時相同。 實施例19至24 光擴散板是以與實施例1至12相同的方式製造，並製 [S] 24 1378269 造成相同的尺寸，除了擴散顆粒的類蜇方面’是使用矽顆 粒取代丙烯酸樹脂顆粒，且在實施例21與22中，表層係 形成於基層的一表面上，以及在實施例23與24中’表層 係形成於基層的二個表面上之外。 實施例19至24之光擴散板的具體組成，係顯示於下 列表5中。 【表5】 基1 “重量份） 表層（重量份） 圖形層 PC PS 矽顆粒 MS 矽顆粒 19 800 200 1 - 〇 20 200 800 1 - - 〇 21, 23 800 200 - 100 7 〇 22, 24 200 800 100 7 〇 * PC:聚碳酸酯（2,2-雙（4-羥基苯基）丙烷與光氣的反應產物）； LG-陶氏(LG Dow);型號Calibre 300-22 氺PS:聚碳酸酯；東洋苯乙烯株式會社(ToyoStyrene);型號HRM40 氺MS :笨乙烯-丙烯酸酯共聚物樹脂；曰本鋼鐵化學公司（Nippon Steel Chemical);型號MS600 * Si顆粒：矽顆粒；日興利卡株式會社(Nikko Rica);型號MSP-020S 量測以此所獲得之光擴散板的總透光度、霧度、亮度、 捲曲度、吸水性以及熱變形溫度。測量結果顯示於下表6。 10【表6】_ 實施 例 總透光度 (%) 霧度 (%) 亮度 (cd/m2) 捲曲度 (mm) 吸水性 (%) 熱變形 ,121.8 ------—__ 1 00 1 19 48.5 99 4583 0.18 20 47.2 99 4516 0.16 ~TrT~ 21 48.7 99 4625 0.18 0.19 1 UU. 1 —118.2 go 1 22 47.6 4576 0.17 "~〇J8 23 48.9 99 4654 0.17 0.18 yy* l 118.1 I~99-5 24 48.1 99 4585 0.16 tit： 25 1378269 由表6可以清楚得知，具有圖形層之光擴散板的總透 光度接近40%且亮度高。 此外’此種光擴散板被裝設於32吋的背光模組上，之 後，將擴散膜、稜鏡膜以及反射偏光膜依序地裝設於其上’ 5而後以肉眼評估燈管的影像能否被看見。結果顯示，光擴 散板遮蔽燈管的能力良好。 mCurl degree, water absorption, and heat distortion temperature. The measurement results are shown in Table 4 below. [Table 4] Example Total Transparency (%) Haze (%) Brightness (cd/m2) Curl (mm) Water Absorption (%) Heat Deformation Temperature 廑i0C) 13 88.4 75.8 79.5 ^5621 0.15 0.16 __0Λ6_ Γ 〇πτ~ 110.2 ^Π0.1 ^ 15 1 /r 90.1 76.4 _4816 0.15 0.15 109 8 Ιο ____90.5 79.6 ^746 〇16 _〇Λ7 〇Π 109.4 110 3 17 1 Q ___90.3 77.8 ^953 0.17 1 ο _____90 .8 78.6 _5865_ 0.16 0.16 109.9 J From, month a, 隹 独 独 用 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 符合 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' The stability is the same as when using a polycarbonate resin and a polystyrene resin mixture. Examples 19 to 24 Light-diffusing sheets were produced in the same manner as in Examples 1 to 12, and [S] 24 1378269 was produced to the same size, except that the class of the diffusion particles was to replace the acrylic particles with ruthenium particles, and In Examples 21 and 22, the surface layer was formed on one surface of the base layer, and in Examples 23 and 24, the 'surface layer was formed on the two surfaces of the base layer. The specific compositions of the light diffusing plates of Examples 19 to 24 are shown in Table 5 below. [Table 5] Base 1 "Part by weight" Surface layer (parts by weight) Graphic layer PC PS 矽 Particles MS 矽 Particles 19 800 200 1 - 〇20 200 800 1 - - 〇21, 23 800 200 - 100 7 〇22, 24 200 800 100 7 〇* PC: polycarbonate (reaction product of 2,2-bis(4-hydroxyphenyl)propane with phosgene); LG-Dow (LG Dow); model Calibre 300-22 氺PS: poly Carbonate; Toyo Styrene; Model HRM40 氺MS: Stupid ethylene-acrylate copolymer resin; Nippon Steel Chemical; Model MS600 * Si granule: bismuth granule; Nikko Rica; model MSP-020S measures the total transmittance, haze, brightness, curl, water absorption and heat distortion temperature of the light diffusing plate obtained. The measurement results are shown in Table 6 below. [Table 6] _ Example Total Transmittance (%) Haze (%) Brightness (cd/m2) Curl (mm) Water Absorption (%) Thermal Deformation, 121.8 -------__ 1 00 1 19 48.5 99 4583 0.18 20 47.2 99 4516 0.16 ~TrT~ 21 48.7 99 4625 0.18 0.19 1 UU. 1 —118.2 go 1 22 47.6 4576 0.17 "~〇J8 23 4 8.9 99 4654 0.17 0.18 yy* l 118.1 I~99-5 24 48.1 99 4585 0.16 tit: 25 1378269 It can be clearly seen from Table 6 that the light transmittance of the light diffusing plate having the pattern layer is close to 40% and the brightness is high. In addition, the light diffusing plate is mounted on a 32-inch backlight module, and then the diffusion film, the ruthenium film, and the reflective polarizing film are sequentially mounted thereon. 5 Then, the image of the tube is visually evaluated. Can be seen. The results show that the light diffusing plate has good ability to shield the lamp. m
26 1378269 【圖式簡單說明】 第一圖為立體圖，顯示本發明第一實施例的擴散板； 第二圖為立體圖，顯示本發明第二實施例的擴散板； 第三圖為立體圖，顯示本發明第三實施例的擴散板； 5 以及 第四圖為立體圖，顯示本發明第四實施例的擴散板。 【主要元件符號說明】 10基層 20表層 ίο 30, 40, 50, 60 圖形層 a寬度 b高度 ί S326 1378269 BRIEF DESCRIPTION OF THE DRAWINGS The first drawing is a perspective view showing a diffusing plate according to a first embodiment of the present invention; the second drawing is a perspective view showing a diffusing plate according to a second embodiment of the present invention; and the third drawing is a perspective view showing the present The diffusing plate of the third embodiment of the invention; and the fourth drawing are perspective views showing the diffusing plate of the fourth embodiment of the present invention. [Main component symbol description] 10 base layer 20 surface layer ίο 30, 40, 50, 60 graphics layer a width b height ί S3
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