200532327 14955pif.doc 九、發明說明： 【發明所屬之技術領域】 本發明為關於光學零件或光學機器等使用的背光模組， 以及使用此北背光模組的液晶顯示裝置。 【先前技術】 先前使用的側光型之背光模組，在導光板的側端面設反 光罩，反光罩内部設置發光源，由其入光端面導入導光板的 光，由設在導光板底面的反射板散亂反射，在反射板對面的 光射出面射出，成為液晶面板等使用的背光模組。 此場合的反光罩，為將含有微粒子的黏合樹脂，塗布在 用聚對苯二甲酸乙醇酯(p〇lyethylene terephthalat匀等的有機 材料形成的高分子膜片，使微粒子在高分子膜片的一面分 散，再祕等的金屬真空驗的金屬薄膜層覆蓋形成的反光 罩。 又有在上述的高分子膜片中或薄板中，分散丙烯基 (Acryl)樹脂等之微細填充物，形成有散亂反㈣性的反射板 (例如參考專利文獻1)。 (專利文獻1)日本專利特開2003_279714號公報 (主要在第4〜6頁右攔、第2圖） 【發明内容】 f上述的先前技術，要利用光源在反光罩内面反射的光 匕，a在!呂等製成的反光罩内面，貼上聚對苯二曱酸乙醇 S曰等有機材料配製的高分子膜片中散布細微之填充物的反 200532327 14955pif.d〇c til但有T才料的高分子骐片，受發光源的紫外線照射 ==(叫’交汽）’會降低反射♦，引起顯示品質的降低(亮 '對比不m色不均等）’要長期維持顯示品質有困 難，致有背光膜組的信賴性低之問題。 、…本發明為解決上述之問題，對於在導光板關端面配置 的側光型的背光模組，該光源部至少由發光源及反光 才成’其特徵為在該反光罩的内面，形成有财光性及熱放 射性的光學反射塗膜。 又，在燈罩内部設置複數的發光源之正下面型的背光模 組’其特徵為在該灯罩的内面，形成㈤光性及減射性的光 學反射塗膜。 又，本發明的液晶顯示裝置之特徵為使用上述的背光模 組0 、 如上述，本發明之背光模組，使用無機材料形成的光學 反射主膜，可防止由發光源的紫外線照射之變黃等，能夠半 永久ϋ的維持顯示品質，有提升背光模組之信賴性的效果。 "又，光學反射塗膜10,因熱放射性亦優良，亦能提高冷 卻效果，能夠抑制發光源的發光效率之降低，同時增加發^ 源電流供應可提高亮度之外，亦能抑制對液晶面板的熱流 出’故亦有提升液晶面板的顯示品質之效果。 為讓本發明之上述和其他目的，特徵和優點能更明顯易 懂，下文特舉較佳實施例，並配合所附圖式，詳細說明如下。 【實施方式】 ° 200532327 14955pif.doc 第-考圖面說明本發明的背賴組的實施例。 一實施例的液晶顯示裝置之斷面的模式圖。 背光模組二=顯示裝置，本實崎^ 偏光2液晶顯示裝置1㈣日日日面板，在其表面及底面配置 5 祕相金屬板，形成—面開放的箱形。 為作為發光源的冷陰極管，係管狀的冷陰極型的榮光 灯官’在反鮮4内設置-減複數個，可由通電發出可視 光線、紫外線及紅外線。本實施例中只設置一支;入 。 ^又，發光源不限於上述之冷陰極管，例如用極^的 螢光灯管也可以。 6為導光板，係用光吸收少的透明材料製作略成長方 體，在一側的端面用嵌合或對接結合方式安裝反光罩4^該 反光罩4内部設置發光源5，在導光板6的該側端面為入= 端面6a，正對反光罩4，發光源5發出的光由該入光端面如 進入導光板6。 在本實施例’由反光罩4及作為發光源的冷陰極管$等 構成的光源部，用嵌合方式結合安裝於導光板6。 由該入光端面6a輸入導光板6的光，經設在導光板$ 的底面6b之反射板7反射，由對側的導光體6表面，亦即 光射出面6c射出，該光透過透鏡片8、及當做光擴散元件的 200532327 14955pif.doc 擴散板9、偏光板3，照射到液晶面板2 ^ 本實施例的反射板7，為在薄板中散布微細的填充物， 使形成有散亂反射特性的反射板。 10為光學反射塗膜，為用白色之金屬氧化物，白色之金 屬氮化合物，白色之金屬碳化物、白色之金屬硫化物的微細 粒子形成的無機填充物，混合液態的黏合劑製成的塗料，塗 布後乾燥形成的白色塗膜，在反光罩4的内面如上 ς 光學反射塗膜10。 成 側光型的背光模組，即由上述的反光罩4與發光源5形 ，的光源部及導光板6、反射板7、透鏡片8、以及擴散板$ 等構成。 —上述之光學反射塗膜10使用的無機填充物之白色金屬 氧化物’有氧化鎂、氧魅、氧切、氧簡，氧化欽、、氧 化釔、氧化鋅、氧化皓等，其中至少使用一種。 白色金屬氮化物2b有氮化石夕、氮化銳、氮化銷等 用其中之至少一種。 白色金屬碳化物2c有碳化矽·碳化鈦等，使用其中至+ —種。 〆、 y 白色金屬硫化物2d有硫酸鋇等。 上述的黏合劑有矽乳膠、矽樹脂等 場合，至少將其中的-種成=二 ’在黏合針含有的溶劑蒸發時形成的無 及材抖構成的細，具有結合機能，能促進無機填充物之間 200532327 14955pif.doc 的結合，及如圖1所示的與反光罩4的内面等之對象物的結 合專之機能。 形成上述光學反射塗膜1Q的塗料之基核份為無機填 充物及液態的黏合劑。無機填充物只要含有自色的金屬氧化 物、金屬氮化物、金屬碳化物、金屬硫化物之至少一種就夠。 又，無機填充物佔該塗料之比率，以在5重量％以上85 重量％以下較佳。 ▲上述的黏合劑，單獨塗布乾燥時形成無機材料的透明塗 膜、’能將吸收的熱經熱放射向外部放射，可用做有熱放射性 的透明塗膜(稱為熱放射性透明塗膜U)，且因用益機材料構 成，對紫外線等照射不會變黃，能夠半永久性的保持透明性。 上述的光學反射塗膜10,因該塗膜表面的凹凸或因白色 的無機填充物，有優良的散亂反射特性；而且縣學反射塗 膜丨〇為無機填充物用無機材料的透明塗膜結合，全部為無 機材料構成，故耐光特性優良，特別是對紫外線的耐光特 1 ’與有機材料相比極為優越，經紫外線光長_、射亦不變 育’能半永久性的維持反射特性。 σ又，白色之塗膜的光學反射塗膜10,因該構成材料含有 可將紅外線或遠紅外線變換為熱之作用，及將熱變換成红外 線，遠紅外線放射作用的金屬氧化物等的無機填充物，故與 通常的白色麵或減紐麵u相比、具有優良的熱放身; 性，有將吸收的熱經熱放射向外部放出之機能。 、 形成該光學反射塗膜10的反光罩4之内面，用金屬鏡 10 200532327 14955pif.doc 面等之有反射性的面’或無反射性的面皆可。重要的是 ^反光罩4的内面形成光學反射塗膜1Q，即能發揮上述= 以下說明上述構造的作用。 冷陰極官5發出的光，有由導光板6的入光端面如直 接進入導光板内部的光，及在反光罩4的内面形成的白色之 光學反射塗膜10，散亂反射進入導光板6的光。由冷陰極管 5亦發出紫外線，但光學反射塗膜1〇為如上述的無機材料構 成，故不發生變黃，能永久的維持顯示品質，有提升背光模 組的信賴性之效果。 ' 又，在設置增反射模等的金屬性反光罩，熱傳導優良對 熱放射較差，光源部的高溫度可能超過冷陰極管5的最適溫 度，使冷陰極管5的發光效率低下，亮度降低，或光源部近 傍的熱傳送到液晶面板2，使液晶面板2的對比度或透過率 低下，有引起顯示品質降低之情況。本實施例的光學反射塗 膜1〇，熱放射性亦優良，反光罩4的熱傳導冷卻加上放射熱 的冷卻，可提高冷卻效果，不僅能抑制冷陰極管5的發光效 率低下，且亦能夠增加輸入冷陰極管5的電流，提高亮度。 又能抑制對液晶面板的熱流出，有提高顯示品質之效果。 第二實施例 圖2是第二實施例的液晶顯示裝置之斷面的模式圖。圖 中與第一實施例相同之部分，以同一符號表示，其說明省 略。在本實施例，反光罩4的外部亦有光學反射塗膜。 200532327 14955pif.doc 如上述之構造，除有第_實施_效果外，增加光學反 射塗模1G的熱之轉換成紅外線的變換作用，提高反光罩* 的外面之減，缺提高光源部的冷卻效果，能抑制冷 陰f管5的發光效率低下，或提高亮度，而且能更提高液晶 面板2的顯示品質。 又，在反光罩4的外面形成熱放射性透明塗膜u 其熱放射性發生的冷卻效果。 此場合，在反光罩4的外面形成的塗膜，不限定於上述 的熱放射性透明塗膜1卜只要是有熱放射性的塗膜(包含不 透明的塗膜）’皆可制其滅雜之程度，娜㈣的冷卻 被吳。 第三實施例 圖3(a)，示第三實施例的光源部之斷面的模式圖。 又與上述之實施例同樣部分，以同一符號表示，豆 省略。 八 ^在圖3(a)，20為增反射膜，是在反光罩4的内面，將銀 等的金屬以蒸鍍法形成膜狀’用以反射冷陰極管5發出的光。 本實施例為如圖3(a)所示，在增反射膜2〇的内面，形 成熱放射性透明塗膜11。 如上述的構造，因有能夠半永久性的保持透明性的熱放 射性透明塗膜11，可不妨礙增反射膜20的反射特性，^能 改善反光罩4的熱放射性，不僅能抑制冷陰極管5的發光效 率~低&鬲冷陰極管5的壳度，而且能抑制熱流出到液晶 12 200532327 14955pif.doc 面板2，可提高顯示品質。 又如圖3(b)所示的，在反光罩4的外面亦形成熱放射性 透明塗膜11，可更提高上述的效果。 第四實施例 圖4是第四實施例的液晶顯示裝置之斷面的模式圖，圖 5(a)(b)為第四實施例的光吸收塗膜之形成狀態的說明圖。 又與前述各實施例同樣部分以同一符號表示，其說明省 略0 圖4中，21為光吸收塗膜，為可吸收所定之光量(例如 光吸收率在5〜20%程度)的塗料之塗膜，設在反光罩4與導 光板6嵌合相接的嵌合部，及/或在其近傍。 ^ 該光吸收塗膜21的形成，如圖5(a)所示，可在反光罩^ 的内面之光學反射塗膜10的内側之嵌合部及/或其近傍形 成。如圖5(b)所示，在導光板6的反光罩4之嵌合部及/或者 其近傍形成亦可。 如上述的構造，剛進入導光板6的光，各處的光強度不 均一 ’又在導光板6的入光端面6a的邊緣近傍，該邊緣部分 的形狀為不定形之場合，由於該邊緣部增加導光板6的光射 出面6c射出之光成分，在液晶面板2的光源部近傍，發生高 亮度區域，降低顯示品質。 如本實施例，在反光罩4的鼓合部及/或其近傍形成光吸 收塗膜21，可在上述第一實施例的效果，增加一項可降低光 源部近傍的背光膜組之亮度至所定之光量，能更改善顯示品 13 200532327 14955pif.doc 又’上述之在圖5(b)中，說明的光吸收塗膜21，是在導 光板6的嵌合部及/或其近傍的光射出面6c及底面6b形成之 情況。但在嵌合部的全部周圍形成亦可，或僅在嵌合部的一 部分，例如需要改善亮度之部分形成亦可。 乂又，在反光罩4的内面形成光吸收塗膜21的方法，可 如别述的方式，在反光罩4的内面形成之光學反射塗膜 上\重疊塗布形成亦可。將光學反射塗膜1〇與光吸收塗膜 21形成部位瞵接，分別形成也可以。 、 身又，反光罩4用對接合之組合的場合，在該對接部與反 光罩4及/或導光板6的對接部之近傍，與前述同樣地形成光 吸收塗膜21就可以。依此可得與上述同樣的效果。 第五實施例 圖6(a)是第五實施例的光源部及導光板的說明圖。 又與前述實施例同樣的部分以同一符號表示，其說明省 略0 本實施例的導光板6，如圖6⑻所示，在入光端面 兩側端瞬接的兩個導光板側端面6d ’及在入光端面6a對面 的導光板6之對向綱面6e，形成光學反射塗膜。 ^於上述之構造’射人導光板6的光碰賴向側端面 e ’或兩側的導光板側端面6d，光被有效的反射，再度進入 導光板6之内部，可再利用該些反射光，又因該光學= 膜10不會變黃，故能夠半永久性的保持高亮度化。土 14 200532327 14955pif.doc 可提高導光板的冷 可提升顯示品質。 二個側端面的任何 又因光學反射塗膜10的熱放射性， 卻效果，能抑制對液晶面板2的熱流出， 又，光學反射塗膜10，只要在上述的 一個形成即可得同樣的效果。 代身顧其熱放射性，能提高導歧6的冷卻效果。 =6(b)所示’在對向側端面&亦設置光源之場合， =胡樣地在導光板綱面6d的—方或双方，形成光學 ω或熱放射性透明塗膜u，亦可穫得與上述同樣 mL，在對向側端面6e設置光源之場合，為設置接合用 卩或對接部，可稍許延長導紐6的對向 第六實施例 圖7(a)(b)為第六實施例的背光膜組之說明圖。 又與前述實施同樣的部分用—符號表示，說明亦省略。 在圖7(a)中’ 22疋微小圖案，為由光學反射塗膜1〇形 、點狀之圖案，在導光板6的光射出面&的對面；亦即底 ，仍，利用光學反射塗膜1〇印刷成長狀。如圖7⑼所示， ^光源部近傍點狀的密度較疎，離光源部越遠點狀密度越 也即由该些點狀的疎密程度之設定，使在光出射面 6c的亮 度分佈均勻之構造。 如上述之構造，由於該不變黃的光學反射塗膜10之散 亂反射特性，能夠半永久的維持良好的背光效率，而且，因 200532327 14955pif.doc 該熱放射性可提高導光板的冷卻效果，故能夠抑 板2的熱流出，提升顯示品質。 σ〉之晶面 又，該微小圖案22，不限於上述的點狀，在冷陰 的長方向成直線狀亦可。 β ° s 又在兩側配置光源部之場合，彳用在該中央部配 圖案較密，兩端側隨其位置之靠近光源部側，微小 度較疏之構造。 推 再於導光6的底面6b，形成熱放射性透明塗膜η覆蓋 該些微小圖案，即可增加該熱放射性效果外，又能防止^些 微小圖案22因磨擦而剝離。 ""二 第七實施例 圖8(a)(b)為第七實施例的背光模組之說明圖，又與前述 各實施例同樣部分用同一符號，其說明省略。 在圖8(a)中，23為基板，用樹脂材料或金屬材料構成的 膠片，膜片或板，需在光學反射塗膜1〇形成時能耐其乾燥 溫度，在該基板23的一面之全面形成光學反射塗膜1〇，該 光學反射塗膜10配置在導光板6的光射出面6c的反對側之 面亦即與底面6b相對，用以代替反射板7。 本實施例的基板23為鋁等的金屬板。 如上述之構造，由於不變黃的光學反射塗膜1〇的散亂 反射特性，能夠半永久性維持良好的背光效率，而且，因金 屬板之基板23的熱傳導性及光學反射塗膜1〇的熱放射性， 導光板6的熱，特別是由光源部傳來的熱，能由導光體6的 200532327 14955pif.doc 底面6b側有效地熱放射，故能夠抑制向液晶面板2的熱流 出，提升顯示品質。 又’如圖8(b)所示’在基板23形成光學反射塗膜1〇的 導光板6之底面6b側’形成熱放射性透明塗膜11保護該光 學反射塗膜10，即可暨不影響光學特性又可防止因導光板6 與光學反射塗膜10的磨擦，引起的光學反射塗膜10的剝離 或無機填充物的脫落等。 圖9(a)、（b)是第七實施例的背光模組的其他形態。 圖9(a)為圖8(a)所示的背光模組，用紹等之金屬板製成 的外殼24收容之狀態。 該場合，光學反射塗膜10在外殼24的導光板6之底面 6b側直接形成，在圖8(a)所示的基板23省略。 又圖9(b)為與圖8(b)所示的背光模組同樣的形成熱放射 性透明塗膜11之場合。 … 用如上述的構造，除可得與前各例同樣效果外，尚可省 略基板23，能夠降低背光膜組的製造成本。 又在圖8⑻、⑼及圖9⑻、⑼之場合，如在外殼24的 外側形成光學反射塗膜1Q或熱放射性透明膜u，則可由該 各別的熱放射性，提高導光板6的冷卻效果。 17 200532327 14955pif.doc 狀態。 如此，可減小導光板6的光源部近傍與其他部位的亮度 差，能夠得到與第四實施例同樣的效果。 又如圖6(1?)所不，在導光板6之兩側配置光源部之場 合，在各別的光源部側設置光吸收塗膜21即可，在圖5(b) 的導光板6設光吸收塗膜21之場合亦相同。 以上的各實施例，為液晶顯示裝置j的側光型背光模 組，使用冷陰極管5為光源之例。 使用該冷陰極管5之場合，如果未如前述的將冷陰極管 5的酿度調至取適溫度，則可能引起發光效率或灯管 小的問題。 71丢極官」巧六贯尤效罕最大的最適溫度範圍（一 ^為70〜80。〇，溫度更低或更高皆使發光效率下降。灯 〒則溫度高電極劣化快，壽命短。 ，前的液晶顯示裝置卜甚多冷陰極管5的冷卻不足， 的溫度超過最適朗之問題，此_之解決方 法如上述各實施例所示。 ，冷卻冷陰極管5之場合，需將冷 =延長壽命’但由於製造時的不均稱等，如Π 傍冷卻最冷’則在息灯時冷陰極管5内部的水 谷易在電極近傍停留，再度點灯時電極火花 冷發光效率或壽命之可能，所以需要局二 °較通的部位，且雜冷陰極管5在最適之溫度。 18 200532327 14955pif.doc 亦即，因冷陰極管5的發光效率，係由在冷陰極管5内 的水銀之水銀洛氣塵決定，故無必要冷卻全部之冷陰極管 5，只要局部的冷卻將冷陰極管5發光產生的熱，冷卻至最 適之溫度範圍，就可免除上述之顧慮，使冷陰極管5長壽化。 第八實施例 ~ 圖11示第八實施例的背光模組的模式圖。圖12示圖u 的A-A斷面圖。 圖11為背光模組的由導光板6之光出射面6(：側所見之 圖。 又與前述各實施例相同部分以同一符號表示其說明省 在圖11及® 12中，30為熱放射部，由光學 1〇形成’設妓鮮4 _面讀導紐6 相對之面（亦稱入光端面對向面31)，面對冷陰極$ a 並配置於入光端面對向面31的該略中央部: 此場合之由光學反射塗膜1〇形成的熱放射部恥 為1mm以上約在20mm程度，厚度只要丨叫爪以上 長度 熱放射部3G的端部；配置在離開冷陰極f °。又该 以上之位置。 电極5a20mm 又，反光罩4的内面（包含入光端面對向 面或增反射膜2〇。 ）為金屬鏡 使用述之構造，由光學反射塗膜1Q形成的熱敌射部♦ 19 200532327 14955pif.doc 之虞，且散亂反射，幾不發生光吸收，故無亮度降低 例如膜1Q的熱放射性較反光罩4的基材 該部分的^冷^管5成容易冷卻之狀態，可實現在 可因ί埶ί熱放射部3G，用熱放射性透明塗膜11形成，亦 第hi:性實現與上述同樣的局部冷卻。 圖13是第九實施例的背光膜組之模式圖。 之圖。目13為背光模組由導光板6的光射出自6C側所見 面對中、32為凸部’設在反光罩4之内面的入光端 極^*之冷陰極管5的長方向之略中央部分，向冷陰 的^乎^ ’亚橫跨該入光端面對向面31的該略中央部分 此場合，該凸部32的長度為！咖以上2〇咖左右，高度 二μηι以上，設定在不與冷陰極朗之高度。又該凸部^ 的W ’配設在離冷陰極管5的電極5a約2()腿以上之位置。 本實施例之反光罩4的内面（包含凸部32)，全部形成光 予反射塗膜10。 如上述之構造，S *部32與冷陰極管5的距離短，故 該4刀之冷陰極管5成為容易冷卻之狀態，暨可由不變黃 的光學反射類10半永久的維持散亂反射的光學特性，而 且能實現局部冷卻。 20 200532327 14955pif.doc 該凸部32,可如1 14所示的將光學反射塗膜i〇重複塗 布使突出喊，亦可與圖13的場合同樣地，冷陰極管5發 出的光，被光學反射塗膜10散亂反射。由光學反射塗膜1〇 形成的該凸部32的反射特性與其他場所相同，因凸部盘 冷陰極管5的距雜短’故該部分的冷陰歸絲易冷卻^ 狀態’暨可由不變黃的光學反膜1()半永久的維持散亂 反射的光學特性，且能實現局部冷卻。 又’省略設有凸部32的反光罩4之内面的光學反射塗 膜10，改成金屬鏡面或增反射膜20，也可因凸部32與冷陰 極管5的距離短，可實現局部冷卻。 上述之各貝施例可適宜地組合，由於該些組合可得各實 施例之效果相加的效果。 、 上述之各實施例，為對液晶顯示裝置丨使用的側光型背 光模組，適用光學反射塗膜l0或熱放射性透明塗膜U之場 合說明，但液晶顯示裝置1大概有二十型以上，普遍使用在 液晶面板2的正下面配設光源部的正下面型背光模組。 以下說明正下面型之背光模組適用適用光學反射塗膜 10或熱放射性透明塗膜11的場合。 第十實施例 圖15是第十實施例的液晶顯示裝置的斷面之模式圖， 圖16為圖15的上面之圖。 圖15所示的為正下面型之背光模組，圖16為除下擴散 板與液晶面板及偏光板後的上面之圖。又與前述之各實施例 21 200532327 14955pif.doc 同樣部分以同一符號表示，其說明亦省略。 在圖15及圖16中，40為灯罩，在其内面形成光學反射 塗膜10。 在灯罩40的内部設置複數的冷陰極管5，冷陰極管$發 出的光’由灯罩40内面的光學反射塗膜1〇散亂反射，透 過没在灯罩40之開口部的光擴散零件之擴散板41及偏光板 3 ’射出到液晶面板2。 正下面型之場合的光源部，為由灯罩4〇及複數的冷陰 極管5構成；背光模組即由光源部及擴散板41等構成。 、如上述，因使用有反射特性之無機材料製成的光學反射 塗膜10，能解決先前的在灯罩40内面配置的有機材料形成 的反射膜，受紫外線照射變黃降低反射特性之問題。因此， 可得經紫外線長期間照射不變黃，能維持半永久的反性 之效果。 又’因光學反射魏1G的熱放射性亦優異，射呂構成 的灯罩40 ’由冷陰極管5發出的熱，經過灯罩4〇的熱傳導 性及，學反射塗膜1G的熱放射性，有效率地向外部放出， 提高冷卻效果，也能抑制冷陰極f 5的發光效率降低，同 日守亦能增加供給冷陰極管5的電力啸高亮度。又能夠將低 對液晶面板2的熱流出，提升顯示品質。 — =因可縮短冷陰極管5與灯罩4()的距離，使用正下 3L皮光模組的液晶顯示裝置！，亦能夠薄型化。 又，在灯罩40的外面，與上述第二實施例所述的同樣 22 200532327 的，形成光學反射塗膜10或熱放射性透明塗膜li，則該各 別的熱放射性產生的冷卻效果’可增加上述的冷卻效果。 第十一實施例 圖17示第十一實施例的背光膜組的模式圖。 又，與前述各實施例相同部分以同一符號表示，其說明 亦省略。 本實施例的基板23為鋁板，與第七實施例所示的同樣 地在其一個面形成光學反射塗膜10，在灯罩4〇的内面用貼 合等方式配置。 ' 如上述的構造，可得如上述第十實施例的效果外，尚有 在灯罩40開孔時，該孔可用基板23堵塞，仍能防止冷陰極 管5發出的光向外部漏出，或外部的灰塵侵入，而且能夠容 易地在灯罩40的外面安裝電路基板等。 第十二實施例 圖19為圖 圖18是第十二實施例的背光模組的模式圖。 18的上面之圖。 本實施例的灯罩40的内面，f 反射板7的各冷陰極管5的近傍， 又，圖19為取下擴散板41之情況的上面之圖。又與前 述各實施例相同部分以同—符號表示，其說明省略。” ，配置先前的反射板7，在該200532327 14955pif.doc IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a backlight module used for optical parts or optical devices, and a liquid crystal display device using the northern backlight module. [Prior technology] The previously used edge-lit backlight module has a reflector on the side end face of the light guide plate, and a light source is set inside the reflector. The light from the light guide plate is used to guide the light from the light guide plate. The reflecting plate is scattered and reflected, and the light emitting surface opposite to the reflecting plate is emitted, and becomes a backlight module used in a liquid crystal panel and the like. In this case, the reflector is coated with a microparticle-containing adhesive resin on a polymer film made of an organic material such as polyethylene terephthalat, so that the microparticles are on one side of the polymer film. Reflector formed by covering the metal thin film layer of metal vacuum test such as dispersion, re-secret, etc. In addition, in the above polymer film or sheet, fine fillers such as acryl resin are dispersed, and scattered. Anti-reflective reflector (for example, refer to Patent Document 1). (Patent Document 1) Japanese Patent Laid-Open No. 2003_279714 (mainly on the right side of pages 4 to 6, and FIG. 2) [Summary of the Invention] f The above-mentioned prior art To use the light reflected from the light source on the inner surface of the reflector, a. On the inner surface of the reflector made by Lu et al., Paste a polymer film made of organic materials such as polyethylene terephthalate and so on. The reverse of the material is 200532327 14955pif.d〇c til, but the polymer cymbals with T material are exposed to ultraviolet light from the light source == (called 'acoustic vapor') will reduce reflection ♦, causing a reduction in display quality (bright 'contrast Color unevenness ) 'It is difficult to maintain the display quality for a long time, resulting in a problem of low reliability of the backlight film group... In order to solve the above-mentioned problems, the present invention provides an edge-light type backlight module arranged on the close end surface of the light guide plate. The part is made up of at least a light source and a reflection light, and is characterized in that a reflective reflective film with optical properties and thermal radiation is formed on the inner surface of the reflector. In addition, a backlight of a plurality of light sources is provided inside the lamp cover. The module 'characterized in that the optical reflection coating film of the luminous property and the anti-reflection property was formed on the inner surface of the lamp cover. The liquid crystal display device of the present invention is characterized by using the backlight module 0 described above. As described above, the present invention The backlight module uses an optical reflective main film formed of an inorganic material, which can prevent yellowing caused by the ultraviolet radiation of the light source, and can semi-permanently maintain the display quality, which has the effect of improving the reliability of the backlight module. The optical reflective coating film 10 is also excellent in thermal radiation and can improve the cooling effect. It can suppress the decrease in the luminous efficiency of the light source, and at the same time increase the source current supply. In addition to high brightness, it can also suppress the thermal outflow of the liquid crystal panel, so it also has the effect of improving the display quality of the liquid crystal panel. In order to make the above and other objects, features and advantages of the present invention more obvious and easier to understand, the following specific examples are compared. The preferred embodiment and the accompanying drawings are described in detail below. [Embodiment] ° 200532327 14955pif.doc The first embodiment of the present invention is described with reference to the drawings. A cross section of a liquid crystal display device according to an embodiment Backlight module two = display device, Ben Shizaki ^ polarized light 2 liquid crystal display device 1 day and day panel, 5 secret phase metal plates are arranged on its surface and bottom surface, forming a box shape with an open surface. As a light emitting The source of cold cathode tubes is a tubular cold cathode-type glare lamp officer 'set in the anti-refreshment 4-reducing the number of them, which can be powered by the visible light, ultraviolet rays and infrared rays. Only one is provided in this embodiment; The light source is not limited to the cold cathode tube described above, and for example, a fluorescent tube may be used. 6 is a light guide plate, which is made of a slightly rectangular parallelepiped with a transparent material with little light absorption, and a reflector 4 is fitted on the end surface by a fitting or butt joint method. A light source 5 is provided inside the reflector 4, and the light guide plate 6 The side end face is the entrance = end face 6a, facing the reflector 4, and the light emitted from the light source 5 enters the light guide plate 6 through the light entrance end face. In this embodiment ', a light source section including a reflector 4 and a cold cathode tube $ as a light source is mounted on the light guide plate 6 in a fitting manner. The light input to the light guide plate 6 through the light incident end face 6a is reflected by the reflection plate 7 provided on the bottom surface 6b of the light guide plate $, and is emitted from the surface of the light guide body 6 on the opposite side, that is, the light exit surface 6c, and the light passes through the lens Sheet 8, and 200532327 14955pif.doc, which is a light diffusing element, diffuser plate 9, polarizing plate 3, and irradiate the liquid crystal panel 2 ^ The reflective plate 7 of this embodiment is a fine filler that is dispersed in a thin plate, and the formation is scattered. Reflective reflector. 10 is an optical reflective coating film, which is an inorganic filler formed by fine particles of white metal oxides, white metal nitrogen compounds, white metal carbides, and white metal sulfides, mixed with a liquid binder After the coating, the white coating film is dried and formed on the inner surface of the reflector 4 as described above and the optical reflection coating film 10 is formed. An edge-light-type backlight module is composed of the above-mentioned reflector 4 and light-emitting source 5, the light source unit, the light guide plate 6, the reflection plate 7, the lens sheet 8, and the diffuser $. —The white metal oxide of the inorganic filler used in the above-mentioned optical reflection coating film 10 includes magnesium oxide, oxygen charm, oxygen cutting, oxygen oxide, oxoxane, yttrium oxide, zinc oxide, and oxidized oxide, among which at least one kind is used . The white metal nitride 2b includes at least one of nitride nitride, sharp nitride, and nitride pin. Examples of the white metal carbide 2c include silicon carbide and titanium carbide. Among them, up to + are used. 〆, y White metal sulfide 2d includes barium sulfate and the like. In the case of the above-mentioned adhesives, such as silicone latex, silicone resin, etc., at least one of them is formed into two kinds, which are formed when the solvent contained in the adhesive needle is evaporated. The combination of 200532327 14955pif.doc and the combination with the inner surface of the reflector 4 as shown in FIG. The base material of the coating material forming the optical reflection coating film 1Q is an inorganic filler and a liquid binder. It is sufficient if the inorganic filler contains at least one of a self-colored metal oxide, metal nitride, metal carbide, and metal sulfide. In addition, the ratio of the inorganic filler to the coating material is preferably 5% to 85% by weight. ▲ The above-mentioned adhesive can be applied as a transparent coating film that forms an inorganic material when it is dried. It can radiate the absorbed heat to the outside through thermal radiation. It can be used as a transparent coating film with thermal radioactivity (referred to as a thermal radioactive transparent coating film U) And because of the use of organic materials, it will not turn yellow when exposed to ultraviolet rays and so on, and can maintain transparency semi-permanently. The above-mentioned optical reflection coating film 10 has excellent scattered reflection characteristics due to the unevenness of the surface of the coating film or the white inorganic filler; and the county-level reflection coating film is a transparent coating film of an inorganic material for inorganic fillers. Combined, it is composed of inorganic materials, so it has excellent light resistance. In particular, it has superior light resistance to ultraviolet rays compared with organic materials. It can maintain the reflection characteristics semi-permanently through ultraviolet light growth and radiation. σ In addition, the optical reflection coating film 10 of the white coating film contains inorganic fillers such as metal oxides that can convert infrared or far-infrared rays into heat and metal oxides that convert heat into infrared rays and far-infrared rays. Compared with the ordinary white surface or reduced surface u, it has excellent heat release performance, and has the function of releasing the absorbed heat to the outside through heat radiation. The inner surface of the reflector 4 forming the optical reflection coating film 10 may be a reflective surface such as a metal mirror 10 200532327 14955pif.doc surface or a non-reflective surface. It is important that the optical reflection coating film 1Q is formed on the inner surface of the reflector 4, that is, the above-mentioned function can be exerted as follows. The light emitted by the cold cathode officer 5 includes the light-entering end face of the light guide plate 6 such as light that directly enters the inside of the light guide plate, and the white optical reflective coating film 10 formed on the inner surface of the reflector 4, and scattered into the light guide plate 6. Light. The cold cathode tube 5 also emits ultraviolet rays, but the optical reflection coating film 10 is composed of the inorganic material as described above, so it does not turn yellow, can maintain the display quality permanently, and has the effect of improving the reliability of the backlight module. 'Also, when a metal reflector such as an anti-reflection mode is installed, the thermal conductivity is excellent and the heat radiation is poor. The high temperature of the light source part may exceed the optimum temperature of the cold cathode tube 5, which causes the luminous efficiency of the cold cathode tube 5 to be low, and the brightness to be reduced. Or, the heat in the vicinity of the light source unit is transmitted to the liquid crystal panel 2 and the contrast or transmittance of the liquid crystal panel 2 is lowered, which may cause a reduction in display quality. The optical reflective coating film 10 of this embodiment is also excellent in thermal radioactivity. The heat conduction cooling of the reflector 4 and the cooling of the radiant heat can improve the cooling effect, and not only can suppress the low luminous efficiency of the cold cathode tube 5 but also increase it. The current input to the cold cathode tube 5 improves the brightness. It can also suppress the heat outflow to the liquid crystal panel, and has the effect of improving the display quality. Second Embodiment Fig. 2 is a schematic view of a cross section of a liquid crystal display device according to a second embodiment. In the figure, the same parts as those in the first embodiment are indicated by the same symbols, and the description is omitted. In this embodiment, an optical reflection coating film is also provided on the outside of the reflector 4. 200532327 14955pif.doc The structure as described above, in addition to the _implementation_ effect, increases the conversion of the heat of the optical reflection coating mold 1G into infrared, which increases the reduction of the outside of the reflector *, and lacks the cooling effect of the light source part , Can suppress the luminous efficiency of the cold cathode f tube 5 to be low, or increase the brightness, and can further improve the display quality of the liquid crystal panel 2. In addition, a thermal radioactive transparent coating film u is formed on the outer surface of the reflector 4, and the cooling effect of the thermal radioactivity is formed. In this case, the coating film formed on the outer surface of the reflector 4 is not limited to the above-mentioned thermally radioactive transparent coating film 1. As long as it is a thermally radioactive coating film (including an opaque coating film), its degree of impurity elimination can be controlled. Na's cooling was taken by Wu. Third Embodiment Fig. 3 (a) is a schematic view showing a cross section of a light source section according to a third embodiment. The same parts as those of the above-mentioned embodiment are denoted by the same symbols, and the beans are omitted. In Fig. 3 (a), 20 is an antireflection film, and a metal such as silver is formed into a film shape on the inner surface of the reflector 4 by a vapor deposition method to reflect the light emitted from the cold cathode tube 5. In this embodiment, as shown in FIG. 3 (a), a thermally radioactive transparent coating film 11 is formed on the inner surface of the antireflection film 20. With the structure described above, the thermally radioactive transparent coating film 11 capable of semi-permanently maintaining transparency can prevent the reflection characteristics of the antireflection film 20, and can improve the thermal radioactivity of the reflector 4, and can not only suppress the cold cathode tube 5 Luminous efficiency ~ low & hull of cold cathode tube 5, and can inhibit heat from flowing out to liquid crystal 12 200532327 14955pif.doc panel 2, which can improve display quality. As shown in Fig. 3 (b), a thermally radioactive transparent coating film 11 is also formed on the outer surface of the reflector 4 to further enhance the above-mentioned effects. Fourth Embodiment Fig. 4 is a schematic view of a cross-section of a liquid crystal display device of a fourth embodiment, and Figs. 5 (a) and 5 (b) are explanatory views of a state of forming a light-absorbing coating film of the fourth embodiment. The same parts as the previous embodiments are indicated by the same symbols, and their descriptions are omitted. In FIG. 4, 21 is a light-absorbing coating film, which is a coating that can absorb a predetermined amount of light (for example, the light absorption rate is about 5 to 20%). The film is provided at a fitting portion where the reflector 4 and the light guide plate 6 are fitted and connected, and / or near the fitting portion. ^ The formation of the light-absorbing coating film 21 can be formed on the inner fitting surface of the optical reflective coating film 10 on the inner surface of the reflector ^ and / or its vicinity as shown in FIG. 5 (a). As shown in Fig. 5 (b), it may be formed in the fitting portion and / or its vicinity of the reflector 4 of the light guide plate 6. With the structure as described above, the light that has just entered the light guide plate 6 has uneven light intensity everywhere, and it is near the edge of the light incident end face 6a of the light guide plate 6. When the shape of the edge portion is irregular, the edge portion Increasing the light component emitted from the light emitting surface 6c of the light guide plate 6 causes a high-luminance area near the light source portion of the liquid crystal panel 2 to reduce display quality. As in this embodiment, a light absorbing coating film 21 is formed on the bulging portion of the reflector 4 and / or its vicinity, and an effect of the first embodiment described above can be added to reduce the brightness of the backlight film group near the light source portion to The predetermined amount of light can further improve the display product 13 200532327 14955pif.doc and the light absorption coating film 21 described above in FIG. 5 (b) is the light at the fitting portion of the light guide plate 6 and / or its vicinity. When the emission surface 6c and the bottom surface 6b are formed. However, it may be formed around the entirety of the fitting portion, or it may be formed only in a part of the fitting portion, for example, a portion where the brightness needs to be improved. In addition, the method of forming the light-absorbing coating film 21 on the inner surface of the reflector 4 can be formed on the optical reflective coating film formed on the inner surface of the reflector 4 as described above. The optical reflection coating film 10 and the light absorbing coating film 21 may be formed in contact with each other, and may be formed separately. When the reflector 4 is combined with a pair of joints, the light-absorbing coating film 21 may be formed in the same manner as described above near the abutting portion and the abutting portion of the reflector 4 and / or the light guide plate 6. In this way, the same effects as described above can be obtained. Fifth Embodiment Fig. 6 (a) is an explanatory diagram of a light source section and a light guide plate according to a fifth embodiment. The same parts as those in the previous embodiment are indicated by the same symbols, and the description thereof is omitted. As shown in FIG. 6 (a), the light guide plate 6 of this embodiment is instantaneously connected to the two light guide plate side end faces 6d 'and An optically reflective coating film is formed on the facing surface 6e of the light guide plate 6 opposite to the light incident end surface 6a. ^ In the above-mentioned structure, 'light from the light guide plate 6 hits the side end face e' or the light guide plate side end faces 6d on both sides, the light is effectively reflected and enters the light guide plate 6 again, and these reflections can be reused. Since the light = film 10 does not turn yellow, it is possible to maintain high brightness semi-permanently. Soil 14 200532327 14955pif.doc can increase the cooling of the light guide plate and improve the display quality. Any of the two side end surfaces is effective due to thermal radiation of the optical reflection coating film 10, and can suppress the heat outflow to the liquid crystal panel 2. In addition, the optical reflection coating film 10 can have the same effect as long as it is formed in the above one . Taking care of its thermal radioactivity, it can improve the cooling effect of Guidance 6. = 6 (b) shown in the case where a light source is also provided on the opposite side face & = Hu-like optically or thermally radioactive transparent coating film u is formed on one or both sides of the light guide plate outline 6d, or Obtain the same mL as above, and when a light source is provided on the opposite side end surface 6e, in order to provide a joint or a butt joint, the alignment of the guide 6 can be slightly extended. The sixth embodiment is shown in FIG. 7 (a) and (b). An explanatory diagram of the backlight film group of the embodiment. The same parts as in the previous embodiment are indicated by a-symbol, and the description is omitted. In FIG. 7 (a), the '22 疋 micropattern is a 10-point, dot-like pattern formed by the optical reflection coating film, on the opposite side of the light exit surface & of the light guide plate 6; that is, bottom, still, using optical reflection The coating film 10 is printed in a long shape. As shown in FIG. 7 (b), the density of the dots near the light source is relatively high. The farther away from the light source, the more the density of the dots, that is, the density of the dots is set to make the brightness distribution on the light exit surface 6c uniform structure. With the structure described above, due to the scattered reflection characteristics of the non-yellowing optical reflection coating film 10, a good backlight efficiency can be maintained semi-permanently, and since the thermal radiation of 200532327 14955pif.doc can improve the cooling effect of the light guide plate, It can suppress the heat outflow of the plate 2 and improve the display quality. The crystal plane of σ> is not limited to the above-mentioned dot pattern, but may be linear in the longitudinal direction of the cold shade. When β ° s is provided with light source parts on both sides, it is used for a structure with a denser pattern on the central part, and the ends are closer to the light source part side according to its position, and the structure is relatively thin. Pushing on the bottom surface 6b of the light guide 6 to form a thermally radioactive transparent coating film η to cover the micropatterns can increase the thermal radioactivity effect and prevent the micropatterns 22 from peeling off due to friction. " " Second Embodiment Fig. 8 (a) (b) is an explanatory diagram of a backlight module of a seventh embodiment, and the same reference numerals are used for the same parts as the foregoing embodiments, and the description is omitted. In FIG. 8 (a), 23 is a substrate, and a film, film or plate made of a resin material or a metal material must be able to withstand the drying temperature of the optical reflective coating film 10 when it is formed. An optical reflective coating film 10 is formed, and the optical reflective coating film 10 is disposed on the side opposite to the light exit surface 6c of the light guide plate 6, that is, the surface opposite to the bottom surface 6b, instead of the reflective plate 7. The substrate 23 in this embodiment is a metal plate such as aluminum. With the structure as described above, due to the scattered reflection characteristics of the non-yellowing optical reflection coating film 10, it is possible to maintain good backlight efficiency semi-permanently, and due to the thermal conductivity of the metal plate substrate 23 and the optical reflection coating film 10 Thermal radiation, heat from the light guide plate 6, especially heat transmitted from the light source section, can be efficiently radiated from the bottom surface 6b side of the light guide body 200532327 14955pif.doc, so it can suppress the heat outflow to the liquid crystal panel 2 and improve the display quality. Also, as shown in FIG. 8 (b), a thermally radioactive transparent coating film 11 is formed on the bottom surface 6b side of the light guide plate 6 where the optical reflection coating film 10 is formed on the substrate 23, so that the optical reflection coating film 10 is not affected. The optical characteristics can also prevent the optical reflection coating film 10 from peeling off or the inorganic filler from falling off due to friction between the light guide plate 6 and the optical reflection coating film 10. 9 (a) and 9 (b) show another form of the backlight module according to the seventh embodiment. Fig. 9 (a) is a state in which the backlight module shown in Fig. 8 (a) is accommodated by a case 24 made of a metal plate such as Shao. In this case, the optical reflection coating film 10 is formed directly on the bottom surface 6b side of the light guide plate 6 of the housing 24, and the substrate 23 shown in Fig. 8 (a) is omitted. Fig. 9 (b) shows a case where a thermal radiation transparent coating film 11 is formed similarly to the backlight module shown in Fig. 8 (b). … With the structure described above, in addition to the same effects as the previous examples, the substrate 23 can be omitted, and the manufacturing cost of the backlight film group can be reduced. In the cases of Figs. 8 (a) and 9 (b) and Figs. 9 (a) and 9 (b), if the optical reflective coating film 1Q or the thermally radioactive transparent film u is formed on the outside of the casing 24, the cooling effect of the light guide plate 6 can be improved by the respective thermal radioactivity. 17 200532327 14955pif.doc status. In this way, the difference in brightness between the light source portion in the vicinity of the light guide plate 6 and other portions can be reduced, and the same effect as that of the fourth embodiment can be obtained. As shown in FIG. 6 (1?), When the light source sections are arranged on both sides of the light guide plate 6, a light absorbing coating film 21 may be provided on each light source section side. In the light guide plate 6 of FIG. 5 (b), The same applies when the light-absorbing coating film 21 is provided. Each of the above embodiments is an edge-light backlight module of the liquid crystal display device j, and the cold cathode tube 5 is used as an example of the light source. When the cold cathode tube 5 is used, if the brewing degree of the cold cathode tube 5 is not adjusted to an appropriate temperature as described above, problems such as light emission efficiency or small tube may be caused. "71 diojiuanguan" is the most suitable temperature range (1 ~ 70 ~ 80 °), which lowers the luminous efficiency. If the temperature is lower or higher, the luminous efficiency will decrease. The high temperature electrode will degrade quickly and have a short life. The previous liquid crystal display device has many problems such as insufficient cooling of the cold cathode tube 5 and the temperature exceeding the optimum temperature. The solution of this problem is as shown in the above embodiments. In the case of cooling the cold cathode tube 5, the cold cathode tube 5 needs to be cooled. = Extended life ', but due to unevenness in manufacturing, etc., if Π is cooled the coldest, the water valley inside the cold cathode tube 5 is easy to stay near the electrode when the lamp is turned on, and the electrode sparks cold luminous efficiency or life when the lamp is turned on again. It is possible, so it needs to be in the second place, and the miscellaneous cold cathode tube 5 is at the optimal temperature. 18 200532327 14955pif.doc That is, due to the luminous efficiency of the cold cathode tube 5, it is caused by the cold cathode tube 5. Mercury is determined by mercury and dust, so it is not necessary to cool all the cold cathode tubes 5. As long as the local cooling cools the heat generated by the cold cathode tubes 5 to the optimum temperature range, the above-mentioned concerns can be eliminated and the cold cathodes can be eliminated. Tube 5 is longevity. Eighth Embodiment ~ Fig. 11 is a schematic view of a backlight module of the eighth embodiment. Fig. 12 is a cross-sectional view taken along the line AA of Fig. U. Fig. 11 is a light exit surface 6 (: side of the light guide plate 6 of the backlight module of the backlight module). The same parts as the previous embodiments are indicated by the same symbols. Their description is omitted in Figures 11 and 12, where 30 is the heat radiation part, which is formed by optics 10 'Set prostitutes 4 _ face reading guide 6 Opposite The surface (also referred to as the light-receiving end-face-opposing surface 31) faces the cold cathode $ a and is disposed at the slightly central portion of the light-receiving end-face-opposing surface 31: The thermal radiation part is about 1mm or more and about 20mm, and the thickness is only called the end of the thermal radiation part 3G above the length of the claw; it is arranged at a position f ° away from the cold cathode. It should be more than that. The electrode 5a20mm and the reflector 4 The inner surface (including the light-receiving end-face facing surface or the antireflection film 20) is a structure for the use of a metal mirror, and is formed by a thermal enemy radiation portion formed by an optical reflection coating film 1Q. ♦ 19 200532327 14955pif.doc Reflected, almost no light absorption, so there is no reduction in brightness. For example, the thermal radiation of film 1Q is higher than that of the base material of reflector 4 The divided ^ cold ^ tube 5 can be easily cooled, and can be formed in the thermal radiation section 3G of the cocaine with a thermally radioactive transparent coating film 11, which can also achieve the same local cooling as described above. Figure 13 It is a schematic diagram of the backlight film group of the ninth embodiment. Figure 13. Head 13 is a backlight module that is emitted by the light guide plate 6 from the 6C side and faces the middle, and 32 is a convex portion provided on the inner surface of the reflector 4. The light-receiving end electrode ^ * of the cold-cathode tube 5 is located at the slightly central portion in the longitudinal direction, and the cold-yin yoke is almost across the substantially central portion of the light-receiving end facing surface 31. In this case, the convex portion The length of 32 is from about 20 to about 20 coffee, and the height is more than 2 μm, and it is set at a height that is not equal to that of cold cathode Lang. Further, W 'of the convex portion ^ is disposed at a position approximately 2 () or more from the electrode 5a of the cold cathode tube 5. The inner surface (including the convex portion 32) of the reflector 4 of this embodiment all forms a light pre-reflective coating film 10. With the structure as described above, the distance between the S * section 32 and the cold cathode tube 5 is short, so the 4-blade cold cathode tube 5 becomes easy to cool, and the scattered reflection can be maintained semi-permanently by the non-yellowing optical reflection class 10. Optical characteristics, and can achieve local cooling. 20 200532327 14955pif.doc The convex portion 32 can repeatedly coat the optical reflective coating film i0 as shown in FIG. 14 to make it prominent. The light emitted by the cold cathode tube 5 can be optically similar to the case shown in FIG. 13. The reflective coating film 10 is scattered and reflected. The reflection characteristics of the convex portion 32 formed by the optical reflective coating film 10 are the same as those of other places. Because the distance between the convex plate and the cold cathode tube 5 is short, the cold shade of the portion is easy to cool ^ state. The yellowed optical reflective film 1 () semi-permanently maintains the optical characteristics of scattered reflections and can achieve local cooling. Also, the optical reflection coating film 10 on the inner surface of the reflector 4 provided with the convex portion 32 is omitted, and the metal reflective surface or the antireflection film 20 is changed. The short distance between the convex portion 32 and the cold cathode tube 5 can also realize local cooling. . The above-mentioned embodiments can be appropriately combined, because these combinations can obtain the effect of adding the effects of the embodiments. The above-mentioned embodiments are described for the case where the edge-light type backlight module used in the liquid crystal display device is an optical reflection coating film 10 or a thermally radioactive transparent coating film U, but the liquid crystal display device 1 may have more than twenty types. Generally, a front-type backlight module in which a light source section is disposed directly under the liquid crystal panel 2 is generally used. The following describes the case where the direct type backlight module is suitable for applying the optical reflective coating film 10 or the thermal radioactive transparent coating film 11. Tenth Embodiment FIG. 15 is a schematic cross-sectional view of a liquid crystal display device according to a tenth embodiment, and FIG. 16 is a top view of FIG. 15. FIG. 15 shows a front-type backlight module, and FIG. 16 shows a top view after the diffusion plate, the liquid crystal panel, and the polarizing plate are removed. The same parts as those of the foregoing embodiments 21 200532327 14955pif.doc are denoted by the same symbols, and descriptions thereof are also omitted. In Figs. 15 and 16, reference numeral 40 denotes a lamp cover, and an optical reflection coating film 10 is formed on the inner surface thereof. A plurality of cold cathode tubes 5 are provided inside the lamp cover 40, and the light emitted by the cold cathode tubes $ is scattered and reflected by the optical reflection coating film 10 on the inner surface of the lamp cover 40, and diffuses through the light diffusing parts not in the opening portion of the lamp cover 40 The plate 41 and the polarizing plate 3 ′ are emitted to the liquid crystal panel 2. In the case of a direct type, the light source section is composed of a lampshade 40 and a plurality of cold cathode tubes 5. The backlight module is composed of a light source section, a diffuser plate 41, and the like. As described above, the use of the optical reflection coating film 10 made of an inorganic material having a reflection characteristic can solve the problem that the reflection film formed by the organic material disposed on the inner surface of the lamp cover 40 is yellowed by ultraviolet radiation and reduces the reflection characteristic. Therefore, it is possible to obtain the effect of not yellowing after long-term irradiation of ultraviolet rays, and the semi-permanent reversibility can be maintained. Since the thermal radiation of Wei 1G is also excellent due to the optical reflection, the lampshade 40 formed by the radio tube is heated by the cold cathode tube 5 through the thermal conductivity of the lampshade 40 and the thermal radioactivity of the reflective coating film 1G, effectively. When released to the outside, the cooling effect can be improved, and the decrease in the luminous efficiency of the cold cathode f 5 can be suppressed. On the same day, the high brightness of the electric power supplied to the cold cathode tube 5 can be increased. Furthermore, it is possible to discharge the low heat to the liquid crystal panel 2 and improve the display quality. — = Since the distance between the cold cathode tube 5 and the lampshade 4 () can be shortened, a liquid crystal display device using a direct 3L skin light module is used! , Can also be thin. In addition, on the outside of the lamp cover 40, the same as described in the second embodiment 22 200532327, the optical reflection coating film 10 or the thermal radioactive transparent coating film li is formed, and the cooling effect of the respective thermal radioactivity can be increased. The cooling effect described above. Eleventh Embodiment FIG. 17 is a schematic view showing a backlight film group of an eleventh embodiment. It should be noted that the same parts as those in the foregoing embodiments are denoted by the same reference numerals, and descriptions thereof are also omitted. The substrate 23 of this embodiment is an aluminum plate, and an optical reflection coating film 10 is formed on one surface thereof as in the seventh embodiment, and is arranged on the inner surface of the lamp cover 40 by bonding or the like. '' With the structure described above, in addition to the effects of the tenth embodiment described above, when the lamp cover 40 is opened, the hole can be blocked by the substrate 23, and the light emitted from the cold cathode tube 5 can be prevented from leaking to the outside or the outside The intrusion of dust can easily mount a circuit board or the like on the outside of the lamp cover 40. Twelfth Embodiment FIG. 19 is a schematic view of a backlight module of a twelfth embodiment. The top picture of 18. The inner surface of the lamp cover 40 of this embodiment, the vicinity of each cold cathode tube 5 of the f reflection plate 7, and FIG. 19 is an upper view when the diffusion plate 41 is removed. The same parts as those in the foregoing embodiments are indicated by the same reference numerals, and descriptions thereof are omitted. ”To configure the previous reflector 7
10可防止先前的反 23 200532327 14955pi£doc 射板7變黃，該正對區域43以外的紫外線之照射少的區威， 反射板7就可充分承坦，故不會降低亮度等的光學特性，能 夠延長使用反射板7之場合的壽命。 又，在正對區域43的光學反射塗膜1〇，再塗上熱放射 性透明塗膜11，則不僅仍能維持光學特性，且可抑制光學反 射塗膜10的剝離等。 第十三實施例 圖20為第十三實施例的光源部之說明圖。 在圖20中，44為燈座，用樹脂材料或合成橡膠，非金 屬材料等製作’肋m定複數之冷陰極管5的兩端。 本實施例的灯座44用樹脂材料製造。 在該固定冷陰極管5的燈座44之表面，有塗布光學反 射塗膜10,固定在内面形成光學反射塗膜1〇的灯14〇之内 部。 wt上述的構造’除有上述第十實關之效果外，因樹脂 製造的灯座44，亦能防止被冷陰極管 2防止在液晶影晝面的灯座44近傍之影像^黃色我 長走光模組的壽命。 疋冷陰極管5適用於液晶 上述的計至第十二㈣例，是冷陰極管5適 #不裝置1的正下面型f光模組之發光源的例子。 源之管5使用為側光型背光模組的發光 :如二極管5用於正下面型背光模組之場 。 冷陰極官5的溫度在最適溫度，則有可能引起 24 200532327 14955pif.doc =效=或壽命的降低，對電極近傍的冷卻亦相同。因此， 在Θ部正下面型背光模組的冷陰極管5之場合， 部的冷卻離電極遠的部位，重 1 ϋ， ° 更點在用局部的冷卻，將冷陰極 吕5毛光產生的發熱冷卻至最適之溫度範圍。 第十四實施例 圖21是第十四實施例的光源部之模式圖，圖22為圖21 的上面之圖。 在圖21及及22中，50為熱放射區域，在灯罩4〇之内 面，在前述之圖15所示的擴散板41對向之面(反射面51)的 冷陰極管5之長方向的略中央部，反射面51的冷陰極管$ 之橫方向全長，用光學反射塗膜1〇形成。 此場合之用光學反射塗膜10形成的熱放射區域5〇的長 度為1腿以上之20臟左右，厚度有10μιη以上即夠。又其端 部没置在離冷陰極管5的電極5a在20匪以上之位置。 又’在灯罩40的内面（含反射面51)，貼附反射板7。 由上述的構造，在用光學反射塗膜10形成的熱放射區 域50，射入之光被散亂反射，幾乎不發生光吸收，故無降低 亮度之虞。又光學反射塗膜10的熱放射性較反光罩4的基 材，如鋁材高，故冷陰極管5成容易冷卻之狀態，能夠實現 使用反射板7之場合的局部冷卻。 又在燈罩40的内面(含反射面51)，形成不會變黃的光 學反射塗膜10，則除能半永久的維持反射特性之外，由其熱 放射性燈罩40的内面亦能放射熱，不僅能提高背光模組全 25 200532327 14955pif.doc 體的冷卻效果’同時在接近冷陰極管5的管表放射區 域50，亦由其光學反射塗膜10可實現冷陰極管5的局部a 卻。 又，該熱放射區域50用熱放射性透明塗膜n形成，亦 可由其熱放射性實現如上述同樣的局部冷卻。 第十五實施例 圖23(a)是第十五實施例的光源部之模式圖。 、本實施例的凸部32，設在灯罩40的内面之反射面51的 冷陰極管5長方向之中央部，向冷陰極管5突出，橫跨反射 面51的冷陰極管5之橫方向全長。 此場合之凸部32的長度為lmm以上之2〇咖左右，高設 定在ΙΟμιη以上之不接觸冷陰極管5之高度。又其端部配置 在離冷陰極5的電極5a有20 mm以上之位置。 在本實施例的灯罩40之内面(含凸部32)，全部形成光 學反射塗膜10。 ^ 如上述的構造，因凸部32與冷陰極管5的距離縮短， 及邠为的冷陰極管5成容易冷卻狀態，又由於不變黃的光學 反射塗膜1〇能夠半永久的維持反射特性，同時也能實現局 部冷卻。 Λ凸4 32 ’如圖23(b)所示’將光學反射塗膜1〇加工押 出成型亦可，或將光學反射塗膜10重疊塗布凸出形成也可 =如此可與圖23(a)之場合同樣，冷陰極管5發出的光被光 干反射塗膜10散亂反射，由光學反射塗膜10形成的凸部32 26 200532327 14955pif.doc 的反射特性，與其他場所相同，惟凸部32與冷陰極管5的 距離縮短，故能得到與上述同樣的效果。 又，設置凸部32的灯罩40，將其内面的光學反射塗膜 10省略，改設反射板7，亦因該凸部32與冷陰極管5的距 離縮短，能夠實現局部冷卻。 第十六實施例 圖24為第十六實施例的光源部的上面之圖。 在圖24中，50a〜50h為熱放射區域，係將第十四實施例 (圖22)所示的熱放射區域50分割，對複數的冷陰極管$分別 設置，而且錯開各熱放射區域的配置位置。 又，各熱放射區域50a〜50h的端部，配置在與各冷陰極 管5的電極5a離開20 mm以上之位置。 如上述的構造，除可得與前述之第十四實施例同樣的局 部冷卻效果外，因在灯罩40的内面設有反射板7，在反射板 7與光學反射塗膜10的反射特性相異時，該些用光學反射塗 膜1 〇形成的熱放射性區域50a〜50h分散錯開配置，可減輕背 光發生亮度不均或顏色不均，保持顯示品質。 又，將第十五實施例所示凸部32同樣的分割，亦可得 與第十五實施例同樣的局部冷卻效果。 上述的第十至十六實施例，可適宜地組合，由該些組合 可得該各實施例之效果的相加之效果。 、在上述各實施例中，說明的光學反射塗膜或熱放射性透 明塗膜，為直接塗布在反光罩4或灯罩40形成的。但，反 27 200532327 14955pif.doc 光罩4或灯罩40的光學反射塗膜或熱放射性透明塗膜的形 成方法’不限於上述之方式，將光學反射塗膜或熱放射性透 明塗膜形成膜片狀後，再貼合裝配也可以。在如第七實施例 或第十一實施例所示的基板(熱放射性透明塗膜之場合只限 於透明者)等，先形成光學反射塗膜或熱放射性透明塗膜後， 再貼合形成亦可。 雖然本發明已以較佳實施例揭露如上，然其並非用以限 疋本發明，任何熟悉此項技藝者，在不脫離本發明之精神和 範圍内，當可做些許之更動與潤飾，因此本發明之保護範圍 當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1是第一實施例的液晶顯示裝置之斷面的模式圖。 圖2是第二實施例的液晶顯示裝置之斷面的模式圖。 圖3(a)、（b)是第三實施例的光源部之斷面的模式圖。 圖4是第四實施例的液晶顯示裝置之斷面模式圖。 圖5(a)、（b)是第四實施例的光吸收塗膜之形成狀態的說 明圖。 圖6(a)、（b)是第五實施例的光源部及導光板之說明圖。 圖7(a)、（b)是第六實施例的背光模組之說明圖。 圖8(a)、（b)是第七實施例的背光模組之說明圖。 圖9(a)、（b)是第七實施例的背光模組之其他形態的說明 圖。 圖10是在第七實施例的光學反射塗膜側邊形成光吸收 28 200532327 14955pif.doc10 can prevent the previous reflection 23 200532327 14955pi £ doc The radiation plate 7 turns yellow, and this area directly faces the area with less ultraviolet radiation. The reflection plate 7 can fully accept the light, so it will not reduce the optical characteristics such as brightness. It is possible to extend the life when the reflecting plate 7 is used. Furthermore, by applying the thermally reflective transparent coating film 11 to the optical reflective coating film 10 facing the area 43, not only the optical characteristics can be maintained, but also peeling of the optical reflective coating film 10 can be suppressed. Thirteenth Embodiment FIG. 20 is an explanatory diagram of a light source section of a thirteenth embodiment. In Fig. 20, 44 is a lamp holder, and both ends of the cold cathode tube 5 having a fixed number of ribs m are made of a resin material or a synthetic rubber, a non-metal material, or the like. The socket 44 of this embodiment is made of a resin material. An optical reflective coating film 10 is applied to the surface of the lamp holder 44 of the fixed cold cathode tube 5, and the inside of the lamp 14o is fixed to form an optical reflective coating film 10 on the inner surface. wt In addition to the above-mentioned tenth practical effect of the above structure, the lamp holder 44 made of resin can also be prevented by the cold cathode tube 2 and the image of the lamp holder 44 near the liquid crystal shadow surface. Module life. The cold cathode tube 5 is suitable for liquid crystal. The above-mentioned twelfth example is an example of the light source of the cold cathode tube 5 which is not directly under the type 1 f-light module. The source tube 5 is used for the light emission of the side-light type backlight module: for example, the diode 5 is used for the field of the directly-type backlight module. If the temperature of the cold cathode 5 is at the optimal temperature, it may cause 24 200532327 14955pif.doc = decrease in efficiency or life, and the same applies to the cooling near the electrode. Therefore, in the case of the cold cathode tube 5 of the backlight module directly under the Θ part, the part of the part that is far away from the electrode weighs 1 ϋ, and it is more important to use local cooling to produce the cold cathode Lu 5 hair light. The heat is cooled to the optimum temperature range. Fourteenth Embodiment FIG. 21 is a schematic view of a light source section of a fourteenth embodiment, and FIG. 22 is a top view of FIG. 21. In FIGS. 21 and 22, 50 is a heat radiation area, and the length of the cold cathode tube 5 on the inner surface of the lamp cover 40 and the facing surface (the reflecting surface 51) of the diffuser plate 41 shown in FIG. Slightly at the center, the entire length of the cold cathode tube $ on the reflecting surface 51 is formed with an optical reflective coating film 10. In this case, the length of the heat radiation area 50 formed by the optical reflection coating film 10 is about 20 dirts per leg or more, and the thickness is 10 μm or more. In addition, the end portion is not located at a position more than 20 mm away from the electrode 5a of the cold cathode tube 5. A reflection plate 7 is attached to the inner surface of the lamp cover 40 (including the reflection surface 51). With the above-mentioned structure, in the heat radiation area 50 formed by the optical reflection coating film 10, the incident light is scattered and reflected, and almost no light absorption occurs, so there is no fear of lowering the brightness. In addition, the thermal reflectivity of the optical reflective coating film 10 is higher than that of the base material of the reflector 4, such as aluminum, so the cold cathode tube 5 can be easily cooled, and local cooling can be achieved when the reflective plate 7 is used. In addition, on the inner surface of the lamp cover 40 (including the reflective surface 51), an optical reflective coating film 10 that does not turn yellow is formed. In addition to maintaining the reflection characteristics semi-permanently, the inner surface of the heat radiation lamp cover 40 can also radiate heat. It can improve the cooling effect of the backlight unit 25 200532327 14955pif.doc. At the same time, in the radiation area 50 near the tube surface of the cold cathode tube 5, the optical reflection coating film 10 can be used to achieve a part of the cold cathode tube 5. The heat radiation area 50 is formed by a heat radioactive transparent coating film n, and the heat radiation can be used for local cooling as described above. Fifteenth Embodiment Fig. 23 (a) is a schematic view of a light source section of a fifteenth embodiment. The convex portion 32 of this embodiment is provided at the central portion of the cold cathode tube 5 in the longitudinal direction of the reflecting surface 51 on the inner surface of the lamp cover 40, protrudes toward the cold cathode tube 5, and crosses the transverse direction of the cold cathode tube 5 of the reflecting surface 51. full length. In this case, the length of the convex portion 32 is about 20 mm from 1 mm or more, and the height is set to a height that does not contact the cold cathode tube 5 at 10 μm or more. The end is disposed at a distance of 20 mm or more from the electrode 5a of the cold cathode 5. On the inner surface (including the convex portion 32) of the lamp cover 40 of the present embodiment, the optical reflection coating film 10 is entirely formed. ^ With the structure described above, the distance between the convex portion 32 and the cold cathode tube 5 is shortened, and the cold cathode tube 5 is easily cooled, and the optical reflection coating film 10 that is not yellow can maintain the reflection characteristics semi-permanently. At the same time, it can also achieve local cooling. Λ convex 4 32 'as shown in FIG. 23 (b)' The optical reflection coating film 10 can be processed by extrusion molding, or the optical reflection coating film 10 can be superimposed on the optical reflection coating film 10 to form a protrusion. In the same situation, the light emitted by the cold cathode tube 5 is scattered and reflected by the light dry reflection coating film 10, and the reflection characteristics of the convex portion 32 26 200532327 14955pif.doc formed by the optical reflection coating film 10 are the same as those in other places, but the convex portion Since the distance between 32 and the cold cathode tube 5 is shortened, the same effects as described above can be obtained. In addition, the lamp cover 40 provided with the convex portion 32 is omitted, and the optical reflection coating film 10 on the inner surface thereof is omitted, and the reflection plate 7 is replaced. Also, the distance between the convex portion 32 and the cold cathode tube 5 is shortened, thereby enabling local cooling. Sixteenth Embodiment FIG. 24 is a top view of a light source section of a sixteenth embodiment. In FIG. 24, 50a to 50h are heat radiation regions. The heat radiation region shown in the fourteenth embodiment (FIG. 22) is divided into 50, and a plurality of cold cathode tubes $ are provided separately. Configure the location. In addition, the ends of each of the heat radiation regions 50a to 50h are disposed at a distance of 20 mm or more from the electrode 5a of each cold cathode tube 5. With the structure described above, in addition to the same local cooling effect as the fourteenth embodiment described above, since the reflection plate 7 is provided on the inner surface of the lamp cover 40, the reflection characteristics of the reflection plate 7 and the optical reflection coating film 10 are different. At this time, the thermally radioactive regions 50a to 50h formed by the optical reflection coating film 10 are staggered and arranged, which can reduce uneven brightness or uneven color of the backlight, and maintain display quality. Further, by dividing the convex portion 32 shown in the fifteenth embodiment in the same manner, the same local cooling effect as in the fifteenth embodiment can be obtained. The tenth to sixteenth embodiments described above can be appropriately combined, and the combined effects of the effects of the respective embodiments can be obtained from these combinations. In each of the above embodiments, the optical reflection coating film or the heat radioactive transparent coating film described above is formed by directly coating the reflector 4 or the lamp cover 40. However, the method of forming the optical reflective coating film or the thermo-radiative transparent coating film of the photomask 4 or the lamp cover 40 is not limited to the above-mentioned method, and the optical reflective coating film or the thermo-radiative transparent coating film is formed into a sheet shape. After that, it can be fitted again. For the substrates shown in the seventh embodiment or the eleventh embodiment (in the case of a thermally radioactive transparent coating film, it is only limited to transparent ones), etc., the optical reflective coating film or the thermally radioactive transparent coating film is formed first, and then bonded and formed. can. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application. [Brief Description of the Drawings] FIG. 1 is a schematic view of a cross section of a liquid crystal display device according to a first embodiment. FIG. 2 is a schematic view of a cross section of a liquid crystal display device according to a second embodiment. 3 (a) and 3 (b) are schematic views of a cross section of a light source section according to a third embodiment. FIG. 4 is a schematic sectional view of a liquid crystal display device according to a fourth embodiment. Figs. 5 (a) and 5 (b) are explanatory diagrams showing the formation state of a light-absorbing coating film according to a fourth embodiment. 6 (a) and 6 (b) are explanatory diagrams of a light source section and a light guide plate according to a fifth embodiment. 7 (a) and 7 (b) are explanatory diagrams of a backlight module according to a sixth embodiment. 8 (a) and 8 (b) are explanatory diagrams of a backlight module according to a seventh embodiment. Figs. 9 (a) and 9 (b) are diagrams illustrating other forms of the backlight module of the seventh embodiment. Fig. 10 shows the formation of light absorption on the side of the optical reflection coating film of the seventh embodiment. 28 200532327 14955pif.doc
塗膜之狀態說明圖Q 圖11是第八實施例的背光模組之模式圖。 圖12是圖11的A-A斷面圖。 圖13是第九實施例的背光模組之模式圖。 圖14是第九實施例的背光模組之其他 圖is是第十實施例的液晶顯示裝置之斷二=。 圖16是圖15的上面之圖。 圖17是第十一實施例的背光模組之模式圖。 圖18是第十二實施例的背光模組之模式圖。 圖19是圖18的上面之圖。 圖20是第十三實施例的光源部之說明圖。 圖21是第十四實施例的光源部之模式圖。 圖22是圖21的上面之圖。 圖23是第十五實施例的光源部之模式圖。 圖24是第十六實施例的光源部之上面之圖。 【主要元件符號說明】 1液晶顯示裝置 2液晶面板 3偏光板 4反光罩 5冷陰極管 6導光板 6a入光端面 29 200532327 14955pif.doc 6b底面 6c光射出面 6d導光板側端面 6e對向側端面 7反射板 8透鏡片 9擴散板 10光學反射塗膜 11熱放射性透明塗膜 20增反射膜 21光吸收塗膜 22微小圖案 23基板 24外殼 30熱放射部 31入射端面對向面 32凸部 40燈罩 41擴散板 43正對區域 44燈座 50，50a〜50h熱放射區域 51反射面 30Description of the state of the coating film FIG. Q FIG. 11 is a schematic view of a backlight module of the eighth embodiment. Fig. 12 is a sectional view taken along the line A-A in Fig. 11. FIG. 13 is a schematic diagram of a backlight module according to a ninth embodiment. Fig. 14 is another view of the backlight module of the ninth embodiment. Fig. 14 is a second view of the liquid crystal display device of the tenth embodiment. FIG. 16 is an upper view of FIG. 15. FIG. 17 is a schematic diagram of a backlight module according to the eleventh embodiment. FIG. 18 is a schematic diagram of a backlight module of a twelfth embodiment. FIG. 19 is a top view of FIG. 18. FIG. 20 is an explanatory diagram of a light source section of the thirteenth embodiment. FIG. 21 is a schematic diagram of a light source section of the fourteenth embodiment. FIG. 22 is an upper view of FIG. 21. Fig. 23 is a schematic diagram of a light source section of the fifteenth embodiment. Fig. 24 is a top view of a light source section of the sixteenth embodiment. [Description of main component symbols] 1 Liquid crystal display device 2 Liquid crystal panel 3 Polarizer 4 Reflector 5 Cold cathode tube 6 Light guide plate 6a Light end face 29 200532327 14955pif.doc 6b Bottom face 6c Light exit surface 6d Light guide plate side end face 6e Opposite side End surface 7 Reflective plate 8 Lens sheet 9 Diffusion plate 10 Optical reflective coating film 11 Thermally radioactive transparent coating film 20 Antireflection film 21 Light absorbing coating film 22 Micro-pattern 23 Substrate 24 Housing 30 Thermal radiation portion 31 Incident end face facing surface 32 Convex Section 40, lamp cover 41, diffuser plate 43, directly opposite area 44, lamp holder 50, 50a to 50h, heat radiation area 51, reflecting surface 30