冰626 九、發明說明： 【發明所屬之技術領域】 …本發明係關於-種應用光學膜片組合之f光模組，特別是有關於一種 光學膜片組合可以降低成本，且產生均勻照度面光源，使得透過之光線輝 " 度不致降低，厚度相對較薄之應用光學膜片組合之背光模組。 ‘ 【先前技術】 液晶顯示器（Liquid Crystal Display，LCD)自從問世以來，在市場 上已能漸漸取代傳統之陰極射線管顯示裝置（CRT M〇nit〇r)，由於液晶本 身並不會發光，故通常.具有背絲明功能之f光裝置（驗 • Device)為光源，來達成顯示影像於液晶顯示器之目的。 傳統液晶顯示器的背光模組如圖-所示，該背光模組的一光源2將光發 射至透光性良好的-導光板4下方的-反射片6上，然後該反射片6將光線^ 射到位於該導光板4下方且在該反射片6上方之一擴散板8中。該擴散板眯 光擴散並以均勻照度穿透該導光板4而射向該導光板4上方的液晶顯示哭1〇 上。其中位於該導光板4與該液晶顯示裝置1〇中間設有一擴散板12，該二散 板12係將透過之光線均勻擴散，用以使其下方的背光模組不要成像於液晶 顯示器10上。 ' 另一習知技術如圖二所示，該背光模組之光源2將光發射至透光性良好 φ 的一導光板4下方的一反射片6上，然後該反射片6將光線反射到位於該導光 板上方之下擴散板81中，之後該下擴散板幻將光均勻擴散穿透，未穿透之 光線再次反射透過一菱鏡片5而射向上方的上擴散片82，接著再射向該液晶 顯示器10上。其中該下擴散板81之目的是使光線能均句擴散，而該菱鏡片5 之目的是使光線能再利用以提升光線的亮度，該上擴散片82之目的是防菱 鏡片5之刮傷及進一步掩蓋導光板4及/或下擴散片81及/或菱鏡片5所造成 諸如亮、暗點之光學缺陷或因LCD面板與背光模組刻痕方向不能匹配所造成 之光干涉現象（Moire)。 【發明内容】 本發明之主要目的是提供一種將背光模組中傳統之下擴散片、菱鏡片 及上擴散片等元件利用複數片擴散膜片取代之，使得透過之光線輝度不致 Ϊ27^626 降低’但更節省成本之實質經濟目的。 、為達到上述目的的應用光學膜片組合之背光模組，係在一使可見光透 過的導光板側邊設有一可產生可見光的光源，而導光板的上方設有一由複 數片胃擴散膜片組成的光學膜片組合，將透過導光板之光線重新整理再利用 、提升光線之使用效率，及導光板下方設有一擴散反射元件可將光線擴散 、 並反射到導光板上，藉光學膜片組合可以降低成本，且產生均勻照度面光 源，使得透過之光線輝度不致降低，厚度相對較薄。 ’又 【實施方式】 請參閱圖三為本發明應用光學膜片組合之背光模組的實施架構剖面視 • 目、’ f發明應用光學則組合之背光模組包含-使可見光透過的導光板32 側$设有-可產生可見光的光源3〇，而該導光板32與一液晶顯示裝置34之 严曰％又有一由複數片擴散膜片31組成的光學膜片組合，將透過該導光板％之 ^線重新整理再_，提升光線之使驗率，及該導光板32下方設有一擴 散反射το件33可將光線擴散並反射到該導光板32上，藉該光學膜片組合可 以降低成本，且產生均勻照度光源，使得透過之光線輝度不致降低，厚度 相對較薄。 該複數片擴散膜片31組成的每-擴散膜片31可為同樣形式之擴散膜片 31^但可有厚度不同之組合搭配。而每—概則的結構如圖四所示，該 擴散膜片31包括有-擴散層4卜一基材42、一抗靜電防枯著層43，該擴散 矚層41的組成物包括一熱可塑性高分子樹脂411與光學散射粒子，而該基 材42係承載擴放層41。该抗靜電防枯著層43的組成物包括有一熱可塑性高 分子樹脂431與光學散射粒子432。該擴散層幻是面向該液晶顯示裝置的 一面稱之為「出光面」，該抗靜魏著和是面向將光線導人之導光板32的 一面稱之為「入光面」。 絲材42具有-第一面421與一第二面似，將該擴散層41均句塗佈於 -該基材42的第一面421上，而該抗靜電防枯著層侧均勻塗佈於該基材_ 第二面422上。該擴散層41的組成物係包括有一熱可塑性高分子樹脂犯、 5//以=的擴散粒子（光學粒子）412及加熱約〇1%〜1〇%之硬化劑所組成 其中捕可雖南分子樹脂在擴散層411之重量百分比為⑽〜_，該 1279626 擴散粒子（光學粒子)412與該熱可塑性高分子樹脂411之相對重量百分比為 10%〜200%。該熱可塑性高分子樹脂411係可由聚（甲基）丙烯(p〇iy(me1:h) acryl)酸甲基(methyl)、聚（甲基）丙烯酸乙基地(athyl)等的（甲基）丙烯酸 醋（ester))的單獨或聚合體、聚乙烯對苯二曱脂(p〇lyethylene terephthates)、聚丙烯對苯二甲脂(p〇iypr〇pyrene terephtholates)的聚 月日（P〇lyester)、聚碳酸脂（polycarbonate) ' 聚苯二烯(polystyrene)、聚 甲基戊烯(polymethl pentene)的其中一種或二種以上之混合物所組成。而 該擴散粒子412包括有機擴散粒子及無機擴散粒子所組成，而有機擴散粒子 包含曱基丙烯酸曱醋(PMMA)、聚苯甲基丙烯酸丁醋(pmba)、聚氯乙稀(PVC) φ 等其中一種或二種以上之混合物所組成，無機擴散粒子包含有氧化矽(Si02) 、氧化鋁(A1203)、石夕膠等其中一種或二種以上之混合物所構成。 該基材可為透明’且該基材係可為聚對苯二甲酸乙二酯（PET)、三乙 酸纖維素（TAC)、聚萘曱酸乙二酯（pen)、聚丙二酯、聚醯亞胺、聚醚、 聚碳酸酯、聚胺、聚乙烯、聚丙烯或聚乙烯醇等的樹脂，該基材厚度為25—3〇〇 //m，較佳地，該基材厚度為5〇—2〇〇 //m。 孩抗靜電防黏著層43包括有一熱可塑性高分子樹脂431、5#以下的擴 散粒子（光學粒子）432、硬化劑〇· 1%〜1〇%組成。該熱可塑性高分子樹脂 431在抗靜電防粘著層43之重量百分比為ι〇%〜9〇%，該擴散粒子（光學粒子 )432與忒熱可塑性咼分子樹脂431之相對重量百分比為iQ%〜。該熱可 ® 塑性冋分子樹脂431係可由聚（甲基）丙烯（poly(meth) acryl)酸甲基 (methyl)、聚（甲基）丙烯酸乙基地(athyl)等的（甲基）丙烯酸醋（ester)) 的單獨或聚合體、聚乙騎苯二甲脂(p〇lyethylene terephthates)、聚丙 稀對苯二甲脂(p〇lypropyrene terephth〇lates)的聚脂⑽穴 酸脂（polycarbonate)、聚苯二烯(polystyrene)、聚甲基戊烯(p〇lymethl pentene)的其中一種或二種以上之混合物所組成。而該擴散粒子犯2包括有 機擴散粒子及無機擴散粒子所組成，而有機擴散粒子包含甲基丙烯酸甲酯 (PMMA)、聚笨甲基丙烯酸丁g旨(pmba)、聚氯乙婦(pvc)等其中一種或二種以 混合物所組成，無機擴散粒子包含有氧化矽(Si〇2)、氧化鋁(Al2〇3)、矽 勝等其中-種或二種以上之混合物所構成。該擴散膜片31的乾膜總膜厚為 1279626 50-300/zm，較佳的為5〇—2〇〇_。 經實驗測試，該擴散膜片31的特性如下： 1·可承受鉛筆硬度3H。 2.HAZE(霧度值）8 8%。 .产二胃腿E係從擴散膜片31之一面，（即入光面）以垂直之角 =『穿透娜^ ^『垂直以外之角度射出之光量』（即擴散穿透光量54) ” U呆4膜片而從另一面射出之全光量』（即平行穿透光量53加上 擴散穿透光量54)之_ ;即公式： 十❿W加上 _5,4 __ *1〇〇% φ ( 5 3 + 5 4) 【此為業界在進行光學擴散性能評估所 3·全先線透過率6 3%。 4·可承受工作溫度範圍-40°C〜12(TC。 在本:施發明例中，光源3。包含利用發光二極體α咖隨恤 二極螢光燈管⑹ld触池FWscent Lamp)等線光源， 二Γ入古式匕含但不僅限於如圖三中所示的侧人式⑽⑼邮）光源， 邁^直下式光源（Direct_light ’圖中未標示），光源因非本發明所強調 之重點，原則上設置方式將更有彈性，此為業界所週知。 癱中，導光板32係主要導5丨由光源所射人之光線，反射擴 ^ W板之下方’其目的即是將透過導光板在沒有沿視野角方 向之光線反射再糊’並透過反射擴散片33面向導光板32之—面，均句塗 佈反射層，以增加光線擴散之效果。 a兹^比較測試數字進一步闡述本發明複數片擴散膜片組合與傳統下擴 政片 <鏡片上擴散片組合，在光學輝度之表現效能足堪與之匹敵。該 • 測試結果如下表： 測試儀器 測試方法與環境條件 1279626 輝度計 Chromaraeter 型號：T0PC0RN BM-7 fast (1) 視野角度··中心軸±1。 (2) 測試距離：500腿 (3) 入光形式：側入光 (4) 環境條件：溫度25°C、溼 度55% RH (5) 規格尺寸：17” 對照樣片SetA (傳統方式） 貫驗樣片SetB(本發明） 功能 型號 廠商 型號 廠商 下擴散片 BSX4 KXXXX0 ET-lXxa 發明人 菱鏡片 BEFX-XT XM ET-lXxa 發明人 上擴散片 JSXXXR SXC ET-1XX 發明人 測誠結果比較Ice 626 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to an optical module in which an optical film combination is applied, in particular, an optical film combination can reduce cost and produce a uniform illumination surface. The light source is such that the transmitted light is not reduced, and the thickness is relatively thin, and the backlight module is applied with an optical film combination. [Prior Art] Since the advent of liquid crystal displays (LCDs), they have gradually replaced the traditional cathode ray tube display devices (CRT M〇nit〇r) in the market. Since the liquid crystal itself does not emit light, Usually, a f-light device (device) having a back-screening function is a light source for achieving the purpose of displaying an image on a liquid crystal display. The backlight module of the conventional liquid crystal display is as shown in the figure - a light source 2 of the backlight module emits light to the light-reflecting sheet 6 under the light guide plate 4, and then the reflection sheet 6 emits light ^ It is incident on the diffusion plate 8 located below the light guide plate 4 and above the reflection sheet 6. The diffusing plate 眯 diffuses light and penetrates the light guide plate 4 with uniform illumination to be directed toward the liquid crystal display above the light guide plate 4. A diffuser 12 is disposed between the light guide plate 4 and the liquid crystal display device 1 . The diffuser 12 diffuses the transmitted light uniformly to prevent the backlight module from being imaged on the liquid crystal display 10 . Another conventional technique is shown in FIG. 2, the light source 2 of the backlight module emits light onto a reflection sheet 6 below a light guide plate 4 having good light transmission φ, and then the reflection sheet 6 reflects the light to Located in the diffusing plate 81 above the light guide plate, the lower diffusing plate then uniformly diffuses the light, and the unpenetrated light is reflected again through the diamond lens 5 and is directed upward to the upper diffusing film 82, and then fired again. To the liquid crystal display 10. The purpose of the lower diffuser 81 is to diffuse the light, and the purpose of the diamond lens 5 is to re-use the light to enhance the brightness of the light. The purpose of the upper diffuser 82 is to prevent the scratch of the lens 5. And further obscuring optical defects such as bright and dark spots caused by the light guide plate 4 and/or the lower diffusion sheet 81 and/or the lens 5, or optical interference caused by the inability of the LCD panel and the backlight module to be misaligned (Moire ). SUMMARY OF THE INVENTION The main object of the present invention is to provide a conventional lower diffuser, a diamond lens, an upper diffuser and the like in a backlight module by using a plurality of diffusion films, so that the transmitted light brightness is not reduced by 27^626. 'But it is more economical for cost savings. The backlight module for applying the optical film combination for achieving the above purpose is a light source capable of generating visible light on a side of the light guide plate through which visible light is transmitted, and a plurality of gastric diffusion film on the upper side of the light guide plate. The optical film combination reorganizes and reuses the light transmitted through the light guide plate to improve the efficiency of use of the light, and a diffuse reflection element under the light guide plate diffuses the light and reflects the light onto the light guide plate. The cost is reduced, and a uniform illumination surface light source is generated, so that the transmitted light luminance is not reduced, and the thickness is relatively thin. ' 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施The side is provided with a light source 3 可 which can generate visible light, and the light guide plate 32 and a liquid crystal display device 34 have a combination of an optical film composed of a plurality of diffusion films 31, which will pass through the light guide plate. The wire is rearranged and re-examined, and the light illuminating rate is increased, and a diffused reflection τ is disposed under the light guide plate 32 to diffuse and reflect the light onto the light guide plate 32. The optical film combination can reduce the cost. And a uniform illumination source is generated, so that the transmitted light luminance is not reduced, and the thickness is relatively thin. The per-diffusion film 31 composed of the plurality of diffusion films 31 may be the same type of diffusion film 31, but may have a combination of thicknesses. As shown in FIG. 4, the diffusion film 31 includes a diffusion layer 4, a substrate 42, and an antistatic anti-dry layer 43. The composition of the diffusion layer 41 includes a heat. The plastic polymer resin 411 and the optical scattering particles carry the expansion layer 41. The composition of the antistatic anti-dry layer 43 includes a thermoplastic polymer 431 and optical scattering particles 432. The diffusion layer is called a "light-emitting surface" on the side facing the liquid crystal display device, and the anti-static surface is referred to as a "light-incident surface" on the side of the light guide plate 32 that guides the light. The wire 42 has a first surface 421 similar to a second surface, and the diffusion layer 41 is uniformly applied to the first surface 421 of the substrate 42, and the antistatic dry layer side is uniformly coated. On the substrate _ second side 422. The composition of the diffusion layer 41 comprises a thermoplastic polymer resin, 5// diffusion particles (optical particles) 412 and a hardener of about 1% to 1% by weight. The weight percentage of the molecular resin in the diffusion layer 411 is (10) to _, and the relative weight percentage of the 1279626 diffusion particles (optical particles) 412 to the thermoplastic polymer resin 411 is 10% to 200%. The thermoplastic polymer resin 411 may be a (meth) propylene (p〇iy(me1:h) acryl) acid methyl (methyl) or a poly(meth)acrylic acid (athyl) or the like (methyl). Polyester acrylate (ester) alone or in a polymer, polyethylene terephthalate (P〇lyethylene terephthates), polypropylene p-phthalate (p〇iypr〇pyrene terephtholates) P〇lyester Polycarbonate (polystyrene), polymethl pentene (polymethl pentene) or a mixture of two or more. The diffusion particles 412 comprise organic diffusion particles and inorganic diffusion particles, and the organic diffusion particles comprise fluorenyl phthalic acid vinegar (PMMA), polystyrene methacrylate (pmba), polyvinyl chloride (PVC) φ, etc. One or a mixture of two or more of them, and the inorganic diffusion particles are composed of one or a mixture of two or more of cerium oxide (SiO 2 ), alumina (A1203), and cerium. The substrate may be transparent ' and the substrate may be polyethylene terephthalate (PET), cellulose triacetate (TAC), polyethylene naphthoate (pen), polypropylene, poly a resin such as ruthenium, polyether, polycarbonate, polyamine, polyethylene, polypropylene or polyvinyl alcohol, the substrate having a thickness of 25 - 3 Å / / m, preferably, the thickness of the substrate is 5〇—2〇〇//m. The antistatic anti-adhesion layer 43 includes a thermoplastic polymer resin 431, 5# or less of dispersed particles (optical particles) 432, and a curing agent of 1% to 1% by weight. The weight percentage of the thermoplastic polymer resin 431 in the antistatic anti-adhesion layer 43 is 〇% to 9%, and the relative weight percentage of the diffusion particles (optical particles) 432 to the 忒 thermoplastic 咼 molecular resin 431 is iQ%. ~. The Thermocom® plastic oxime molecular resin 431 can be a (meth)acrylic acid vinegar such as poly(meth)acrylic acid methyl (methyl) acrylate (poly)(meth)acrylic acid (athyl) or the like. (ester) alone or in a polymer, p〇lyethylene terephthates, polypropylene (p), and poly (polycarbonate) of p〇lypropyrene terephth〇lates, One or a mixture of two or more of polystyrene and p〇lymethl pentene. The diffusing particle 2 comprises organic diffusing particles and inorganic diffusing particles, and the organic diffusing particles comprise methyl methacrylate (PMMA), polystyrene methacrylate, pmba, and polychloroethylene (pvc). One or two of them are composed of a mixture, and the inorganic diffusion particles are composed of a mixture of cerium oxide (Si〇2), aluminum oxide (Al2〇3), yttrium, or the like, or a mixture of two or more thereof. The total film thickness of the dry film of the diffusion film 31 is 1279626 50-300/zm, preferably 5〇-2〇〇_. Experimentally, the characteristics of the diffusion membrane 31 are as follows: 1. The pencil hardness can be withstand 3H. 2. HAZE (haze value) 8 8%. The second stomach leg E is from one side of the diffusion membrane 31, that is, the light entrance surface is at a vertical angle = "the amount of light that is emitted from the angle other than the vertical angle" (ie, the amount of light diffused and transmitted 54)" U stays 4 diaphragms and emits the total amount of light from the other side (ie, the amount of parallel transmitted light 53 plus the amount of diffused light 54); that is, the formula: ❿W plus _5,4 __ *1〇〇% φ ( 5 3 + 5 4) [This is the industry's optical diffusivity performance evaluation. 3. The full first-line transmittance is 6 3%. 4. The operating temperature range is -40 ° C ~ 12 (TC. In this: the invention In the example, the light source 3 includes a line source such as a light-emitting diode (A), a two-pole fluorescent tube (6), and a FWscent Lamp, which is not limited to the side person shown in FIG. The light source of the formula (10) (9) (light), the direct light source (Direct_light 'not shown in the figure), the light source is not emphasized by the invention, in principle, the setting method will be more flexible, which is well known in the industry. The light plate 32 is mainly used to guide the light emitted by the light source from the light source, and the reflection is expanded below the bottom plate. The purpose of the light plate 32 is to pass through the light guide plate at a viewing angle. The light of the direction is reflected and pasted and transmitted through the reflective diffuser 33 to the surface of the light guide plate 32, and the reflective layer is coated to increase the effect of light diffusion. a comparative test number further illustrates the multiple diffusion film of the present invention. The combination of the combination of the traditional expansion film and the diffuser on the lens is comparable to the performance of the optical brightness. The test results are as follows: Test instrument test method and environmental conditions 1279626 Luminometer Chromaraeter Model: T0PC0RN BM- 7 fast (1) Field of view · · Center axis ± 1. (2) Test distance: 500 legs (3) Light entering form: side light (4) Environmental conditions: temperature 25 ° C, humidity 55% RH (5) Size: 17” Control sample SetA (traditional) Test sample SetB (invention) Function model Manufacturer model Manufacturer diffusion sheet BSX4 KXXXX0 ET-lXxa Inventor diamond lens BEFX-XT XM ET-lXxa Inventor diffusion sheet JSXXXR Comparison of the results of SXC ET-1XX inventors
SetB 中央點輝 度(Cd/ mm2) 5434 5380 十二點平均輝 度(Cd/ mm2) 5105 5010 總厚度 (//in) 140+168+224= 532 整套單價 (NT$ ) 40+300+60: 400 120+205+205= 530 40+60+60: 160 ’ tt日液晶顯示器要求輕薄短小之特性來看，本發明確實符 1下ϋ 更重要的，剌本發明之辨則組合取代傳統的 薄組合’所節省下來之成本高綱。在今日強調輕 光學板脸人’本發日狀峨_擴散膜版合來取代上述傳統之 項技藝者1關g,凡精于此 明之發明精神及以下所界而這銳_於本發 1279626 【圖式簡單說明】 圖一係為習知背光模組的剖面視圖； 圖二係為另一習知背光模組的剖面視圖； 圖三係為本發明應用光學膜片組合之背光模組的剖面視圖； 圖四係為本發明之擴散模片的剖面視圖；及 圖五係為本發明之擴散模片光學擴散性能示意圖。 【主要元件符號說明】 光源 30 導光板 32 擴散反射元件 33 液晶顯不裝置 34 擴散膜片 31 擴散層 41 基材 42 抗靜電防黏著層 43 熱可塑性高分子榷f脂 411 ^ 431 光學散射粒子 412 、 432 第一面 421 第二面 422 垂直之角度入射光線 52 平行穿透光量 53 擴散穿透光量 54SetB Central point luminance (Cd/ mm2) 5434 5380 Twelve-point average luminance (Cd/ mm2) 5105 5010 Total thickness (//in) 140+168+224= 532 Complete unit price (NT$) 40+300+60: 400 120+205+205= 530 40+60+60: 160' tt The liquid crystal display requires light, thin and short characteristics. The present invention is indeed more important, and the combination of the invention replaces the traditional thin combination. 'The cost of saving is high. In today's emphasis on the light-optical board face people's hair-like 峨 _ diffusion film version to replace the above-mentioned traditional item of art, 1 Guan g, where the spirit of the invention and the following boundaries are sharp and __ this hair 1279626 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional backlight module; FIG. 2 is a cross-sectional view of another conventional backlight module; FIG. 3 is a backlight module using the optical film combination of the present invention. FIG. 4 is a cross-sectional view of the diffusion mold of the present invention; and FIG. 5 is a schematic view showing the optical diffusion performance of the diffusion mold of the present invention. [Main component symbol description] Light source 30 Light guide plate 32 Diffuse reflective element 33 Liquid crystal display device 34 Diffusion film 31 Diffusion layer 41 Substrate 42 Antistatic anti-adhesion layer 43 Thermoplastic polymer 榷f grease 411 ^ 431 Optical scattering particles 412 432 First side 421 Second side 422 Vertical angle incident light 52 Parallel transmitted light amount 53 Diffused light amount 54