201142428 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明是有關於一種液晶顯示器之背光模組，特別是有 關於一種直下式之背光模組，並於背光模組中形成散熱 結構，使得背光模組具有散熱之功能，並進一步其可以 使用在大型之液晶顯示器所形成之廣告看板。 【先前彳支術】 [_2] 一般的背光模組（back 1 ight module)係用來提供液晶 顯示器（Liquid crystal display, LCD)所需之光源 ’由於液晶顯示器的尺寸越來越大，特別是一些使用在 廣告看板的液晶顯示器，其炎寸超過:咕..，使得背光模 組的尺寸也隨著越來越大。 [0003]凊參考第1圖’係為一種習知直下式背光模組之示意圖。 如第1圖所示，直下式背光模組100主要係由一外框11〇、 多個冷陰極螢光燈管（cold cathode fluorescence lamp, CCFL)120、一擴散扳（diffusion Film)l3〇 以及至少一光學膜片（0pticalFilm)140所構成。外 框110之材質係具有光反射能力之材質，以使大部分自冷 陰極螢光燈管120射出之光線能為液晶顯示器利用。此外 ，冷陰極螢光燈管120係以適當間距排列，因此所投射之 面光源於兩根冷陰極螢光燈管以卩之間的亮度較差，但光 源之均勻性（uniformity)在背光模組1〇〇中係為一重 要性質，所以必須在背光模組1〇〇的光出射面上配置擴散 板130與至少一光學膜片140。然而，擴散板130與光學 膜片140價格昂貴，其導致背光模組1〇〇的成本提高。同 099115649 表單編號A0101 苐4頁/共24頁 0992027752-0 201142428 [0004] Ο [0005]201142428 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a backlight module for a liquid crystal display, and more particularly to a direct-lit backlight module, and a heat dissipation structure is formed in the backlight module The backlight module has the function of dissipating heat, and further it can be used for the advertising billboard formed by the large liquid crystal display. [Previous sputum support] [_2] The general backlight module (back 1 ight module) is used to provide the light source required for liquid crystal display (LCD). Some LCD monitors used in advertising billboards are more than 咕.., so that the size of the backlight module is also getting larger and larger. [0003] Referring to FIG. 1 is a schematic diagram of a conventional direct type backlight module. As shown in FIG. 1 , the direct type backlight module 100 mainly comprises an outer frame 11 , a plurality of cold cathode fluorescent lamps (CCFLs) 120 , a diffusion film 13 and a diffusion film. At least one optical film (0pticalFilm) 140 is formed. The material of the outer frame 110 is made of a material having light reflection capability so that most of the light emitted from the cold cathode fluorescent lamp 120 can be utilized for the liquid crystal display. In addition, the cold cathode fluorescent lamps 120 are arranged at an appropriate interval, so that the projected surface light source is poor in brightness between the two cold cathode fluorescent tubes, but the uniformity of the light source is in the backlight module. The middle layer is an important property, so the diffusion plate 130 and the at least one optical film 140 must be disposed on the light exit surface of the backlight module 1 . However, the diffusion plate 130 and the optical film 140 are expensive, which results in an increase in the cost of the backlight module. Same as 099115649 Form No. A0101 苐 4 pages / Total 24 pages 0992027752-0 201142428 [0004] Ο [0005]
099115649 樣地，當使用之冷陰極螢光燈管120數量較多時，會造成 直下式背光模組100具有較嚴重之發熱問題。 如第1圖所示，由於背光模組為一密閉空間，因此很容易 導致熱堆積；例如：在背光模組的密閉空間中的溫度超 過50°C ;使得背光模組會因為溫度過高進而影響冷陰極 螢光燈管的使用效率及壽命。此外，更由於大尺寸的廣 告看板需要更亮的背光模組來提供給液晶顯示器，因而 背光模組中的冷陰極螢光燈管的數量及供給電力也必須 提高，這將使得冷陰極螢光燈管周圍環境溫度更加升高 ，而導致即使增加了冷陰極螢光燈管的數量及供給電力 ，卻無法增加輝（亮）度的情況。簡而言之，由於背光 模組内的溫度過高，除了會使得冷陰極螢光燈管的使用 壽命降低外，其也會使得冷陰極螢光燈管之輝（亮）度 隨著操作時間的增加而降低，這些問題都會造成背光模 組品質下降之問題。 依據本發明之測試結果，當一般之冷陰極螢光燈管在25 °(：的環境下測試其燈管之壽命時，其測試結果為 50, 000〜60, 000小時；但若將冷陰極螢光燈管置於50°C 的環境下測試其燈管之壽命時，其測試結果為 20, 000〜30, 000小時；因此，當冷陰極螢光燈管之數量 愈多或是需要更亮的冷陰極螢光燈管時，都會大幅度的 降低冷陰極螢光燈管之壽命。因此，冷陰極螢光燈管之 熱堆積問題對一個液晶顯示系統是一個關鍵問題；由於 一個液晶顯示系統之使用壽命是由背光模組來決定，而 對於一個以冷陰極螢光燈管為光源之背光模組而言，冷 表單編號AOiOl 第5頁/共24頁 0992027752-0 201142428 陰極螢光燈管即成為背光模組壽命之關鍵；因此，一個 液晶顯示系統之使用壽命是由背光模組中的冷陰極螢光 燈管之壽命來決定。 [0006] 為了改善直下式背光模組之冷陰極螢光燈管的發熱問題 ，目前大都使用散熱片來將熱導出的方式來改善，但是 這些外加的散熱片會影響外觀及增加成本的缺點。因此 ，如何有效解決大尺寸直下式背光模組產生熱的問題， 以有效提高背光模組的光學表現以及增加冷陰極螢光燈 管的使用壽命，是目前必須積極解決之問題之一。 【發明内容】 [0007] 依據前述之問題，本發明之一主要目的在提供一種背光 模組，於背光模組之結構中配置通氣區域，藉由這些通 氣區域解決冷陰極裝置所造成之熱堆積之問題，以使冷 陰極裝置具有較佳之使用壽命。 [0008] 本發明之還有一主要目的，在提供一種背光模組，藉由 冷陰極裝置之透明外環使得冷陰極螢光燈管能夠與外部 空氣隔離，使得冷陰極螢光燈管有較佳的使用壽命。 [0009] 本發明之另一主要目的在提供一種背光模組，於背光模 組之結構中配置通氣區域，藉由這些通氣區域解決冷陰 極裝置所造成之熱堆積之問題，以使冷陰極裝置具有較 佳之輝（亮）度。 [0010] 本發明之另一主要目的，在提供一種背光模組，藉由冷 陰極裝置之透明外環使得冷陰極具有足夠之結構強度而 能夠使用在大尺寸背光模組中。 099115649 表單編號A0101 第6頁/共24頁 0992027752-0 201142428 [0011] 基於上述目的，本發明提出一種背光模組，包括：一個 具有底部及四個侧邊以形成一凹形結構並具有一端開口 之外框，其中四個側邊中的一對側邊為凸起框架；一對 通氣區域，係配置於底部之上且通氣區域具有複數個通 氣孔；複數個冷陰極裝置，係平行且間隔地排列於外框 中，每一冷陰極裝置具有一冷陰極管與兩端電極，以及 一個透明外環包覆冷陰極管並曝露出兩端電極，其中透 明外環之直徑大於冷陰極管且由兩端電極固定於凸起框 架上；一個光學膜，係配置於外框之開口上；一個液晶 ο 顯示器，係配置於該光學膜上。 [0012] 本發明接著提供一種廣告看板，包括一箱體、一控制系 統、一對抽氣裝置以及一背光模組所組成，其中箱體之 正面具有一開放端，而箱體之一背板上則形成兩開口， 控制系統中配置一播放主機，且播放主機具有一通用插 槽及一網路埠，可經由有線及無線網路接收播放内容， 其中廣告看板之特徵包括：背光模組，係配置於箱體之 Q 該開放端之内側面上；一對抽氣裝置，係配置於箱體之 該背板的兩開口上；及一透明外罩，係配置於箱體之開 放端之外側面上，並封閉箱體之開放端；其中背光模組 包括：一外框，具有一底部及四個侧邊以形成一凹形結 構並具有一端開口，其中四個側邊中的一對側邊為凸起 框架；一對通氣區域，係配置於底部之上並與箱體之背 板的兩開口相對應，通氣區域具有複數個通氣孔且通氣 區域小於該兩開口；複數個冷陰極裝置，係平行且間隔 地排列於該外框中，每一冷陰極裝置具有一冷陰極管與 099115649 表單編號A0101 第7頁/共24頁 0992027752-0 201142428 兩端電極，以及一透明外環包覆冷陰極管並曝露出兩端 電極，其中透明外環之直徑大於冷陰極管且由兩端電極 固定於凸起框架上；一光學膜，係配置於外框之開口上 ;一液晶顯示器，係配置於光學膜上。 【實施方式】 [0013] 為讓本發明上述之目的、特徵和優點能更明顯易懂，下 文特舉一較佳實施例，並配合所附圖式，作詳細說明如 下。此外，本發明在此所探討的方向為一種直下式背光 模組之結構及其應用，用以將直下式背光模組使用在大 尺寸的液晶顯示器，特別是使用在廣告看板（AD Board )或是電視牆（TV Board)的系統。為了能徹底地瞭解 本發明，將在下列的描述中提出詳盡的說明。然而，在 下述之說明中，對於眾所周知的液晶顯示器之結構等並 未描述於細節中，以避免造成本發明不必要之限制。然 而，對於本發明的直下式背光模組之較佳實施例，則會 詳細描述如下，然而除了這些詳細描述之外，本發明還 可以廣泛地施行在其他的實施例中，且本發明的範圍不 受限定，其以之後的專利範圍為準。 [0014] 請參考第2圖，係為本發明所提供之一種背光模組之刳視 示意圖。如第2圖所示，背光模組1 0主要係由一外框11、 複數個通氣區域17、多個平行間隔排列的冷陰極裝置12 、一光學膜13、一液晶顯示器15與一驅動器（未顯示於 圖中）所構成。 [0015] 接著，請參考第3A圖，係為本發明之背光模組中的外框 上視示意圖。如第3A圖所示，外框11為一種具有反射光 099115649 表單編號A0101 第8頁/共24頁 0992027752-0 201142428 ❹ 線功能的底部112及四個側邊所形成之“凹”形結構並具 有一端開口，於“凹”形結構之底面112上形成一對凸起 框架111，配置於外框11之兩側邊上，用以承載並與每一 個平行間隔排列的冷陰極裝置12之兩端電極連接，以及 用來提供多個平行間隔排列的冷陰極裝置12所需之電源 (未顯示於圖中）；同時，“凹”形結構之底面112上更 進一步配置有一對通氣區域17，此通氣區域17係配置於 “凹”形結構之另外兩端上並與凸起框架111左右相鄰， 其中，通氣區域17上形成複數條貫穿之通氣孔113，用以 提供背光模組10之内部氣體交換之用。此外，本發明也 可以在“凹”形結構之底面112上形成複數個通氣區域17 ，而這些通氣區域17可以是由複數條貫穿之通氣孔113所 形成，如第3B圖所示；同時，複數個通氣區域17中的通 氣孔115也可以是由複數個幾何形狀的貫穿來形成，如第 3 C圖所示，對此本發明並不加以限制。而增加這些通氣 區域17之目的，是用以增加氣體交換之效果，即增加背 G 光模組具有自然通風之效果。故當本發明之背光模組在 外界環境處於低溫狀態時（例如冬天），即可利用自然 通風之效果來達到背光模組散熱之目的，因此可以節省 能源。 [0016] 接著，再請參考第2圖，光學膜13配置於外框11之“凹” 形結構之開口上，用以封閉外框11，其中，光學膜13可 以包括擴散片（diffusion film)或是稜鏡膜片（prism film)等；同時，光學膜13之外侧再配置有一液晶顯示器 1 5，其中，液晶顯示器15可以由一個液晶層、彩色濾、光 099115649 表單編號A0101 第9頁/共24頁 0992027752-0 201142428 片層、薄膜電晶體電路與驅動晶片（均未顯示於圖中） 等構造所組成。當背光模組10之驅動器驅動電源並經由 凸起框架111提供給多個平行間隔排列的冷陰極裝置1 2時 ，多個平行間隔排列的冷陰極裝置丨2即會發光，其光線 經由光學膜13後，產生均勻的平面光線直接照射在液晶 顯示器15之上，並再藉由液晶顯示器15中的驅動晶片來 控制薄膜電晶體電路的動作，使得光線可以透過彩色濾 光片層及液晶層而達到動態顯示或是靜態顯示之功能。 [0017] 再接著，請參考第4A圖及第4B圖’係本發明之一種具有 透明外環之冷陰極装置之透視示意圖。首先，如第4八圖 所不，冷陰極裝置12係具有▲冷陰極螢光燈管i 21及兩端 電極125，以及一透明外環丨罚用以包覆冷陰極螢光燈管 121並曝露出兩端電極125;其中透明外環123之直徑 大於冷陰極螢光燈管121，故可將冷陰極螢光燈管121配 置於透明外環123中，用以將冷陰極螢光燈管121與外界 之大氣環境隔離；同時，本發明之透明外環12 3的材質可 以是玻璃。此外，為了進一步能更有效地將冷陰極螢光 燈官1 21與外界之大氣環境隔離，透明外環1 2 3之兩端面 1231之中心位置與冷陰極螢光燈管121之兩端電極125接 觸處，係以一種彈性元件（例如：橡膠所形成之〇形環） 或是膠質材料（例如：樹脂-Resin)封閉。固當外界環 境的溫度或是濕度改變時，均不會對冷陰極裝置12中的 冷陰極螢光燈管121造成影響，因此可以有效地增加冷陰 極螢光燈管121的使用壽命及可靠度。同時，藉由此透明 外環123之設計，可以用來支持冷陰極螢光燈管12丨，故 099115649 表單編號A0101 第10頁/共24頁 0992027752-0 201142428 可以將本發明之冷陰極裝置12使用在大尺寸之背光模組 中，使得冷陰極裝置12具有足夠之結構強度。 [0018] 再者，請參考第4B圖，係本發明之具有透明外環之冷陰 極裝置之另一實施例之透視示意圖。如第4B圖所示，本 實施例之冷陰極管裝置12係具有一冷陰極螢光燈管121， 其兩端部形成有以施加電壓之電極122，並有一透明外環 123，其直徑大於冷陰極螢光燈管121，用以將前述冷陰 極螢光燈管121固定於其内部，以及二環狀電極127分別 ❹ ❹ 配置於透明外環123之二端部，且此二環狀電極127分別 與冷陰極螢光燈管121之二電極122電性連接在一起。在 本實施例之透明外環中，還可以形成密封狀態並且在透 明外環123之内部充有惰性氣體。固當外界環境的溫度或 是濕度改變時，均不會對冷陰極裝置12中的冷陰極螢光 燈管121造成影響，因此可以有效地增加冷陰極螢光燈管 121的使用壽命及可靠度。同時，藉由此透明外環123之 材質設計，例如：本實施例之透明外環123的材質為玻璃 ;可以用來支持冷陰極螢光燈管121，故可以將本發明之 冷陰極裝置12使用在大尺寸之背光模組中，使得冷陰極 裝置12具有足夠之結構強度。 [0019] 請參考第5圖，係本發明之背光模組之上視示意圖。如第 5圖所示，係將複數個冷陰極裝置12平行並間隔地配置於 外框11之兩凸起框架111上，藉由冷陰極螢光燈管121之 兩端電極125與凸起框架111中的電性連接端（未顯示於 圖中），將冷陰極螢光燈管121之兩端電極125與電源及 驅動器連接（未顯示於圖中）。由於冷陰極螢光燈管121 099115649 表單編號A0101 第11頁/共24頁 0992027752-0 201142428 之兩端電極125配置於凸起框架111上，故使得冷陰極裝 置12與外框π之底面112有一空間，即冷陰極裝置12不 會與外框11之底面112接觸；因此，可以在背光模組1〇中 形成良好的通風空間。當光學膜1 3與液晶顯示器1 5配置 於外框11上之後，即在背光模組之外框11中形成密閉空 間，此時，即可藉由位於外框丨丨之底面丨丨2上的兩個通氣 區域17之通氣孔113形成進氣（iniet)通道及出氣（ outlet)通道。故當本發明之背光模組1〇的密閉空間中 的溫度堆積至一個較高之溫度後，即可藉由進氣通道將 外部空氣吸入，然後由出氣通道抽出進入背光模組1〇中 的空氣，其氣體之流動如第2圖中的虛翁所示。由於背光 模組10外部空氣的溫度較背秦模組1(1中的溫度低，因此 ，經由本發明於背光模組10之外All上配置進氣通道及 出氣通道之設計，可將背光模組10中的熱帶走，達到降 低溫度之目的，使得熱不會堆積在背光模組10的密閉空 間中。此外，更藉由冷陰極裝置12中的透明外環123的保 護’故將冷陰極螢光燈管m與吸入的空氣隔離，也因此 使得冷陰極螢光燈管m不會直接與濕空氣接觸，故能有 效地使冷陰極螢光燈管121在一個固定的環境中操作，因 此能夠提供較佳的使用壽命。 [0020] 綜上所述，根據本發明之背光模組10中的冷陰極裝置U 以及通氣㈣17之設計，@緖傳統冷陰㈣光燈管所 形成之背光模組，具有下列優點：⑴藉由通氣區域17之 設計，解決使用大量冷陰極裝置12所造叙熱堆積之問 題’故可使冷陰極裝置12具有較佳的使用壽命；⑺藉由 099115649 表單編號A0101 第〗2頁/共24頁 0992027752-0 201142428 •區域17线計’解決使用大量冷陰《Ϊ12所造成 之熱_之_ ’故可使冷陰極裝置12具有較佳的輝度 /⑺藉由多個職區域17之設計，可明加线通風之 效果，以即省能源；⑷藉由冷陰極裝置12之透明外環 123之叹计，使得冷陰極螢光燈管121能夠與外界空氣隔 離’故可具有較佳的使用壽命；⑸藉由冷陰極裝置12之 透明外環123之設計，使得冷陰極榮光燈管121具有足夠 之結構強度而能夠使用在大尺寸背光模組中；以及（6)藉 0 由光學膜13之設計，使得面光源均勻性較佳。 _]接著，請參考第6圖，係將本發明之背光模組配置於大型 液晶顯示系統之示意圖。如第6圖所示，本發明之大型液 晶顯示系統1包括-箱體i 4、一控制系統i 6 '一對抽氣裝 置19A/19B以及一背光模組1〇所組成；其中箱體“之正 面具有一開放端，當背光模組1〇配置並固定於箱體14後 此開口可以將背光模組10之液晶顯示器曝露；而箱 體14之背板上則形成兩開口，此兩開口與背光模組1〇之 Ο 兩個通氣區域17相對應並且箱體14之背板上的兩開口之 口佐大於通氣區域17 ;控制系統16中配置一播放主機（ 未顯示於圖中），此播放主機除了具有一通用插槽（USB )161，可以接收播放内容外；也同時具有一網路埠（ Internet port) 163，可經由有線及無線網路接收播 放内容。此外，為了保大型液晶顯示系統丨之液晶顯示器 15，本發明還可進一步於箱體丨4之開口處配置一透明外 罩18，此透明外罩18之材質可以是壓克力或是強化玻璃 ，可避免外力之破壞及隔離外部環境，例如：灰塵、雨 099115649 表單編號A0101 第13頁/共24頁 0992027752-0 201142428 或是雪等。 [0022] 當本實施例t的大型液晶顯示系統為_廣告看板時’播 放主射將播放内容輸出至背光模㈣之驅動 盗及液晶 員示器15中的驅動晶〇，用以顯示播放内容。由於廣 告看板配置於戶外並且是24小時财播放，因此，廣告 看板必須具有良好的耐㈣，特別是料熱的處理。例 在夏天的戶外，太陽直接照射在廣告看板上因此 在廣告看板内部的環境溫度可能會高達70度以上，再加 上戶外光線亮，使得背光模組必須提高其亮度才能達到 顯示之效果，如此顧—步造成背域組10中也有很高 的溫度。因此，在本實施例中，♦在箱體14之背板上的 由於背板上的_ 口之σ徑大於通氣區域17，故當立中 —個抽氣裝置m將外部空氣吹人廣μ板時，可將外部 較低溫之空氣同時吹人至箱體14及背光模組附；然後 ’由另-個抽氣裝置19Β將箱體14及冑光模組1〇中的空氣 抽出，以產生氣體之流動之路徑，如第6圖十的虛線所示 。由於箱體14外部空氣的溫度較箱體14及背光模組1〇中 的溫度低，因此，經由背光模組10中的進氣通道及出氣 通道之設計，可將箱體14及背光模組1〇中的熱帶走，達 到降低溫度之目的，使得熱不會堆積在箱體14及背光模 組ίο中。此外，更藉由冷陰極裝置12中的透明外環123的 保護，故將冷陰極螢光燈管丨21與吸入的空氣隔離，也因 此使得冷陰極螢光燈管121不會直接與濕空氣接觸，故能 有效地使冷陰極螢光燈管121在一個固定的環境中操作， 099115649 表單編號Α0101 第14頁/共24頁 0992027752-0 201142428 [0023] Ο [0024] [0025] [0026] [0027] Ο [0028] [0029] [0030] [0031] [0032] 使得廣告看板也具有較 因此能夠提供較佳的使用壽命， 長之壽命。 顯然卜依照上面實施财的描述，本發明可 的修正與Μ。因此f要在細=有許多 内加以理解，除了 μ、+、叫， 呀之fe圍 “ 述沣細的描述外，本發明還可以虐 泛地在其他的實施例中施行。上述僅為本發明之較佳實 把例而已ϋ非用以限定本發明之中請專利範固；凡立 它未脫離本發明所揭^之精神下所完成的等效改變或^ 飾’均應包含在下述巾請專利範圍内。 -【圖式簡單說明】 第1圖係為—習知直下式背光模組之示意圖； 第2圖係為本發明之背光模细之剖視示意圖； 第3Α圖〜第3C圖係為本發明之背光模組之一外框之上視 不意圖， 第4Α圖〜第侧係為本發㈣—冷陰極裝置之透視示意 m · 園， . 第5圖係為本發明之背光模組之上視示意圖；及 第6圖係為本發明之-大型液晶顯示系統之示意圖。 【主要元件符號說明】 100直下式背光模組 110外框 120冷陰極螢光燈管 099115649 表單編號A0101 第〗5頁/共24 頁 0992027752-0 201142428 [0033] 130擴散板 [0034] 140 光學膜片 [0035] 10 背光模組 [0036] 11 外框 [0037] 111 凸起框架 [0038] 112 底面 [0039] 113 通氣孔 [0040] 12 冷陰極裝置 [0041] 121 冷陰極管 [0042] 122 電極 [0043] 123 透明外環 [0044] 1231透明外環之端面 [0045] 125 電極 [0046] 127 環狀電極 [0047] 13 光學膜 [0048] 15 液晶顯不器 [0049] 16 控制系統 [0050] 161 通用插槽 [0051] 163 網路埠 099115649 表單編號A0101 第16頁/共24頁 0992027752-0 201142428 [0052] 17 通氣區域 [0053] 18 透明外罩 [0054] 19A/19B抽氣裝置 [0055] 1 91風扇 [0056] 1 大型液晶顯示系統 Ο Ο 099115649 表單編號Α0101 第17頁/共24頁 0992027752-0099115649 In the sample, when the number of cold cathode fluorescent tubes 120 used is large, the direct type backlight module 100 has a serious heat generation problem. As shown in FIG. 1 , since the backlight module is a closed space, it is easy to cause thermal accumulation; for example, the temperature in the sealed space of the backlight module exceeds 50 ° C; Affect the efficiency and longevity of cold cathode fluorescent tubes. In addition, since a large-sized advertising billboard requires a brighter backlight module to be provided to the liquid crystal display, the number and supply power of the cold cathode fluorescent tube in the backlight module must also be increased, which will cause cold cathode fluorescent light. The ambient temperature around the tube is further increased, resulting in an increase in the brightness of the cold cathode fluorescent tube and the supply of electric power. In short, because the temperature inside the backlight module is too high, in addition to reducing the service life of the cold cathode fluorescent tube, it will also make the brightness of the cold cathode fluorescent tube (light) with the operation time. The increase and decrease, these problems will cause the quality of the backlight module to decline. According to the test result of the present invention, when the general cold cathode fluorescent lamp tube is tested for the life of the lamp in a 25 ° (: environment), the test result is 50,000 to 60,000 hours; however, if the cold cathode is to be used When the fluorescent tube is tested at 50 ° C for the life of the tube, the test result is 20,000 to 30 000 hours; therefore, the greater the number of cold cathode fluorescent tubes or the need for more Bright cold cathode fluorescent lamps will greatly reduce the life of cold cathode fluorescent tubes. Therefore, the thermal accumulation of cold cathode fluorescent tubes is a key issue for a liquid crystal display system; due to a liquid crystal display The service life of the system is determined by the backlight module. For a backlight module with a cold cathode fluorescent lamp as the light source, the cold form number AOiOl page 5 / 24 pages 0992027752-0 201142428 cathode fluorescent lamp The tube becomes the key to the life of the backlight module; therefore, the lifetime of a liquid crystal display system is determined by the lifetime of the cold cathode fluorescent tube in the backlight module. [0006] In order to improve the cold cathode of the direct type backlight module Fluorescent tube At present, most of the heat sinks are used to improve the heat transfer method, but these additional heat sinks may affect the appearance and increase the cost. Therefore, how to effectively solve the problem of heat generated by the large-size direct-type backlight module is Effectively improving the optical performance of the backlight module and increasing the service life of the cold cathode fluorescent tube is one of the problems that must be actively solved at present. [0007] According to the foregoing problems, one of the main objects of the present invention is to provide A backlight module is provided with a ventilation area in the structure of the backlight module, and the ventilation area solves the problem of thermal accumulation caused by the cold cathode device, so that the cold cathode device has a better service life. [0008] A further object is to provide a backlight module in which the cold cathode fluorescent lamp can be isolated from the outside air by the transparent outer ring of the cold cathode device, so that the cold cathode fluorescent lamp has a better service life. Another main object of the present invention is to provide a backlight module in which a ventilation region is disposed in a structure of a backlight module. The problem of heat accumulation caused by the cold cathode device is solved by these ventilation regions, so that the cold cathode device has better brightness. [0010] Another main object of the present invention is to provide a backlight module, The transparent outer ring of the cold cathode device allows the cold cathode to have sufficient structural strength to be used in a large-sized backlight module. 099115649 Form No. A0101 Page 6 of 24 0992027752-0 201142428 [0011] Based on the above purpose, The invention provides a backlight module comprising: a frame having a bottom portion and four side edges to form a concave structure and having an open end frame, wherein a pair of side edges of the four side edges are convex frames; a region disposed above the bottom and having a plurality of vent holes in the venting region; a plurality of cold cathode devices arranged in parallel and spaced apart in the outer frame, each cold cathode device having a cold cathode tube and two end electrodes, and a transparent outer ring envelops the cold cathode tube and exposes the electrodes at both ends, wherein the transparent outer ring has a larger diameter than the cold cathode tube and is fixed on the convex frame by the two end electrodes; Optical film, disposed on the lines of the frame opening; ο a liquid crystal display, the optical system disposed on the film. [0012] The present invention further provides an advertising billboard, comprising a box body, a control system, a pair of air extracting devices and a backlight module, wherein the front side of the box body has an open end, and one of the box bodies has a back panel The upper part forms two openings, and the control system is provided with a playing host, and the playing host has a universal slot and a network port, and can receive the playing content via the wired and wireless network, wherein the features of the advertising board include: a backlight module. Is disposed on the inner side of the open end of the box Q; a pair of air suction devices are disposed on the two openings of the back plate of the box; and a transparent outer cover is disposed outside the open end of the box a side surface and an open end of the enclosure; wherein the backlight module comprises: an outer frame having a bottom and four sides to form a concave structure and having an opening at one end, wherein one of the four sides The side is a convex frame; a pair of ventilation regions are disposed on the bottom and correspond to the two openings of the back plate of the box body, the ventilation area has a plurality of ventilation holes and the ventilation area is smaller than the two openings; The pole devices are arranged in parallel and spaced apart in the outer frame, each cold cathode device has a cold cathode tube and 099115649 Form No. A0101 Page 7 / Total 24 Page 0992027752-0 201142428 Both ends of the electrode, and a transparent outer ring Covering the cold cathode tube and exposing the electrodes at both ends, wherein the transparent outer ring has a larger diameter than the cold cathode tube and is fixed on the convex frame by the two end electrodes; an optical film is disposed on the opening of the outer frame; a liquid crystal display , is placed on the optical film. [0013] The above described objects, features, and advantages of the present invention will become more apparent from the claims. In addition, the invention is directed to a direct-lit backlight module structure and application thereof for using a direct-lit backlight module for a large-sized liquid crystal display, particularly for use in an AD Board or It is the system of the TV Board. In order to fully understand the present invention, a detailed description will be given in the following description. However, in the following description, the structure and the like of the well-known liquid crystal display are not described in detail to avoid unnecessary limitation of the present invention. However, the preferred embodiment of the direct type backlight module of the present invention will be described in detail below, but the present invention can be widely applied to other embodiments in addition to the detailed description, and the scope of the present invention. Without limitation, it is subject to the scope of the patents that follow. [0014] Please refer to FIG. 2, which is a schematic view of a backlight module provided by the present invention. As shown in FIG. 2, the backlight module 10 is mainly composed of an outer frame 11, a plurality of ventilation regions 17, a plurality of cold cathode devices 12 arranged in parallel, an optical film 13, a liquid crystal display 15 and a driver ( Not shown in the figure). [0015] Next, please refer to FIG. 3A, which is a top view of the outer frame of the backlight module of the present invention. As shown in FIG. 3A, the outer frame 11 is a "concave" structure formed by the bottom 112 and the four sides of the reflected light 099115649 form number A0101 page 8 / total 24 page 0992027752-0 201142428 ❹ line function and A pair of raised frames 111 are formed on the bottom surface 112 of the "concave" structure, and are disposed on both sides of the outer frame 11 for carrying and two cold cathode devices 12 arranged in parallel with each other. a terminal electrode connection, and a power source (not shown) for providing a plurality of parallel-arranged cold cathode devices 12; and a bottom surface 112 of the "concave" structure is further provided with a pair of ventilation regions 17, The venting region 17 is disposed on the other ends of the "concave" structure and adjacent to the left and right sides of the convex frame 111. The venting region 17 defines a plurality of venting holes 113 extending therein for providing the backlight module 10. Internal gas exchange. In addition, the present invention may also form a plurality of ventilation regions 17 on the bottom surface 112 of the "concave" structure, and these ventilation regions 17 may be formed by a plurality of vent holes 113 penetrating as shown in FIG. 3B; The venting holes 115 in the plurality of venting regions 17 may also be formed by a plurality of geometrical penetrations, as shown in Fig. 3C, and the invention is not limited thereto. The purpose of adding these venting zones 17 is to increase the effect of gas exchange, i.e., to increase the natural ventilation of the back G-light module. Therefore, when the backlight module of the present invention is in a low temperature state (for example, in winter), the effect of natural ventilation can be utilized to achieve the purpose of heat dissipation of the backlight module, thereby saving energy. [0016] Next, referring to FIG. 2, the optical film 13 is disposed on the opening of the "concave" structure of the outer frame 11 for closing the outer frame 11, wherein the optical film 13 may include a diffusion film. Or a prism film or the like; at the same time, a liquid crystal display 15 is disposed on the outer side of the optical film 13, wherein the liquid crystal display 15 can be composed of a liquid crystal layer, color filter, light 099115649, form number A0101, page 9 / A total of 24 pages 0992027752-0 201142428 consists of a layer, a thin film transistor circuit and a driver wafer (both not shown). When the driver of the backlight module 10 drives the power and is supplied to the plurality of parallel-arranged cold cathode devices 12 via the convex frame 111, a plurality of parallel-arranged cold cathode devices 丨2 emit light, and the light passes through the optical film. After 13 , a uniform planar light is directly irradiated on the liquid crystal display 15 , and the driving of the thin film transistor circuit is controlled by the driving wafer in the liquid crystal display 15 so that the light can pass through the color filter layer and the liquid crystal layer. Achieve dynamic display or static display. [0017] Next, please refer to FIGS. 4A and 4B, which are schematic perspective views of a cold cathode device having a transparent outer ring of the present invention. First, as shown in FIG. 8 , the cold cathode device 12 has a cold cathode fluorescent lamp i 21 and two end electrodes 125, and a transparent outer ring is used for coating the cold cathode fluorescent lamp 121. The two ends of the electrode 125 are exposed; wherein the diameter of the transparent outer ring 123 is larger than that of the cold cathode fluorescent lamp 121, the cold cathode fluorescent lamp 121 can be disposed in the transparent outer ring 123 for the cold cathode fluorescent tube. 121 is isolated from the atmosphere of the outside world; at the same time, the material of the transparent outer ring 12 3 of the present invention may be glass. In addition, in order to further effectively isolate the cold cathode fluorescent lamp lamp 121 from the outside atmosphere, the center position of the end faces 1231 of the transparent outer ring 1 2 3 and the electrode 125 at both ends of the cold cathode fluorescent lamp 121 The contact is closed by an elastic member (for example, a loop formed by rubber) or a gelatinous material (for example, resin-Resin). When the temperature or humidity of the external environment changes, the cold cathode fluorescent lamp 121 in the cold cathode device 12 is not affected, so the service life and reliability of the cold cathode fluorescent lamp 121 can be effectively increased. . At the same time, the design of the transparent outer ring 123 can be used to support the cold cathode fluorescent lamp 12丨, so 099115649 Form No. A0101 Page 10 / Total 24 Page 0992027752-0 201142428 The cold cathode device 12 of the present invention can be used. Used in a large-sized backlight module, the cold cathode device 12 has sufficient structural strength. [0018] Furthermore, please refer to FIG. 4B, which is a perspective schematic view of another embodiment of the cold cathode device having a transparent outer ring of the present invention. As shown in FIG. 4B, the cold cathode tube device 12 of the present embodiment has a cold cathode fluorescent lamp tube 121, and an electrode 122 for applying a voltage is formed at both ends thereof, and a transparent outer ring 123 having a diameter larger than that is formed. a cold cathode fluorescent lamp tube 121 for fixing the cold cathode fluorescent lamp tube 121 therein, and two annular electrodes 127 respectively disposed at two ends of the transparent outer ring 123, and the two ring electrodes 127 is electrically connected to the two electrodes 122 of the cold cathode fluorescent lamp 121, respectively. In the transparent outer ring of this embodiment, it is also possible to form a sealed state and to fill the inside of the transparent outer ring 123 with an inert gas. When the temperature or humidity of the external environment changes, the cold cathode fluorescent lamp 121 in the cold cathode device 12 is not affected, so the service life and reliability of the cold cathode fluorescent lamp 121 can be effectively increased. . At the same time, by the material design of the transparent outer ring 123, for example, the transparent outer ring 123 of the present embodiment is made of glass; it can be used to support the cold cathode fluorescent lamp 121, so the cold cathode device 12 of the present invention can be used. Used in a large-sized backlight module, the cold cathode device 12 has sufficient structural strength. [0019] Please refer to FIG. 5, which is a top view of the backlight module of the present invention. As shown in FIG. 5, a plurality of cold cathode devices 12 are arranged in parallel and spaced apart on the two convex frames 111 of the outer frame 11, by the two ends of the cold cathode fluorescent lamp 121 and the convex frame The electrical connection end (not shown) in 111 connects the two end electrodes 125 of the cold cathode fluorescent lamp 121 to the power source and the driver (not shown). Since the cold cathode fluorescent lamp 121 099115649 form number A0101 page 11 / 24 pages 0992027752-0 201142428, the two end electrodes 125 are disposed on the convex frame 111, so that the cold cathode device 12 and the bottom surface 112 of the outer frame π have one The space, that is, the cold cathode device 12 does not come into contact with the bottom surface 112 of the outer frame 11; therefore, a good ventilation space can be formed in the backlight module 1A. After the optical film 13 and the liquid crystal display 15 are disposed on the outer frame 11, a sealed space is formed in the outer frame 11 of the backlight module, and at this time, it can be located on the bottom surface 丨丨2 of the outer frame The venting holes 113 of the two venting regions 17 form an inie channel and an outlet channel. Therefore, when the temperature in the sealed space of the backlight module 1 of the present invention is accumulated to a higher temperature, the external air can be taken in through the air inlet channel, and then extracted into the backlight module 1 through the air outlet channel. The flow of air, as shown in Figure 2, is shown in Figure 2. Since the temperature of the outside air of the backlight module 10 is lower than the temperature of the back Qin module 1 (1), the backlight module and the air outlet channel are disposed on the All of the backlight module 10 through the present invention, and the backlight module can be used. The tropics in the group 10 are cooled to achieve the purpose of lowering the temperature so that heat does not accumulate in the sealed space of the backlight module 10. Further, the cold cathode is further protected by the transparent outer ring 123 in the cold cathode device 12. The fluorescent tube m is isolated from the inhaled air, so that the cold cathode fluorescent lamp m is not directly in contact with the humid air, so that the cold cathode fluorescent lamp 121 can be effectively operated in a fixed environment, According to the design of the cold cathode device U and the ventilation (four) 17 in the backlight module 10 of the present invention, the backlight module formed by the traditional cold cathode (four) light tube The group has the following advantages: (1) solving the problem of heat accumulation by using a large number of cold cathode devices 12 by the design of the venting region 17, so that the cold cathode device 12 can have a better service life; (7) by the number of 099115649 A0 101 Page 2 of 2 page 0992027752-0 201142428 • The area 17 line meter 'solves the use of a large number of cold and cold "heat caused by Ϊ 12 _" so that the cold cathode device 12 can have better brightness / (7) by The design of the plurality of job areas 17 can clearly improve the effect of the line ventilation, so as to save energy; (4) the cold cathode fluorescent lamp 121 can be isolated from the outside air by the sigh of the transparent outer ring 123 of the cold cathode device 12. 'Therefore, it has a better service life; (5) by the design of the transparent outer ring 123 of the cold cathode device 12, the cold cathode glory lamp 121 has sufficient structural strength to be used in a large-sized backlight module; 6) By the design of the optical film 13, the uniformity of the surface light source is better. _] Next, please refer to Fig. 6, which is a schematic diagram of the backlight module of the present invention disposed in a large liquid crystal display system. As shown, the large-size liquid crystal display system 1 of the present invention comprises a box i 4 , a control system i 6 'a pair of air extracting devices 19A/19B and a backlight module 1 ;; wherein the front side of the box has a Open end, when the backlight module is configured and fixed The opening of the box 14 can expose the liquid crystal display of the backlight module 10; and the back panel of the box 14 forms two openings corresponding to the two ventilation areas 17 of the backlight module 1 and the box The mouths of the two openings on the back plate of the body 14 are larger than the ventilation area 17; the control system 16 is provided with a play host (not shown in the figure), and the play host can receive and play in addition to a universal slot (USB) 161. The content is also external; there is also an Internet port 163, which can receive the broadcast content via the wired and wireless network. In addition, in order to maintain the liquid crystal display 15 of the large liquid crystal display system, the present invention can further be in the cabinet. A transparent cover 18 is disposed at the opening of the opening. The transparent cover 18 can be made of acrylic or tempered glass to avoid damage from external forces and to isolate the external environment, such as dust and rain. 099115649 Form No. A0101 Page 13 / Total 24 pages 0992027752-0 201142428 Or snow. [0022] When the large liquid crystal display system of the embodiment t is an advertisement billboard, the main content of the playback is outputted to the backlight of the backlight module (4) and the driving crystal in the liquid crystal display unit 15 for displaying the playback content. . Since the billboards are configured outdoors and are broadcast 24 hours a day, the billboards must have good resistance (4), especially the heat treatment. For example, in the summer outdoors, the sun directly shines on the advertising billboard. Therefore, the ambient temperature inside the advertising billboard may be as high as 70 degrees or more, and the outdoor light is bright, so that the backlight module must increase its brightness to achieve the display effect. Gu-step causes a high temperature in the back domain group 10. Therefore, in the present embodiment, ♦ on the back plate of the casing 14 due to the σ diameter of the _ port on the back plate is larger than the venting region 17, so when the center is a suction device m blows the outside air When the board is used, the externally lower temperature air can be blown to the cabinet 14 and the backlight module at the same time; then the air in the box 14 and the calender module 1〇 is extracted by another air extracting device 19Β The path of the flow of the gas is shown as indicated by the dashed line in Fig. 6. Since the temperature of the outside air of the box 14 is lower than the temperature in the box 14 and the backlight module 1 , the box 14 and the backlight module can be designed through the design of the air inlet channel and the air outlet channel in the backlight module 10 . The tropics in the middle of the raft are cooled to achieve the purpose of lowering the temperature so that heat does not accumulate in the casing 14 and the backlight module ίο. In addition, by the protection of the transparent outer ring 123 in the cold cathode device 12, the cold cathode fluorescent lamp tube 21 is isolated from the inhaled air, so that the cold cathode fluorescent lamp 121 does not directly contact the humid air. Contact, so that the cold cathode fluorescent lamp 121 can be effectively operated in a fixed environment, 099115649 Form No. 1010101 Page 14 / Total 24 Page 0992027752-0 201142428 [0023] Ο [0024] [0025] [0027] [0030] [0032] [0032] The advertising billboard is also provided to provide a better service life and a longer life. Obviously, the invention can be modified and modified according to the description of the above implementation. Therefore, f is to be understood in many ways. In addition to the descriptions of μ, +, 叫, 呀,, the present invention can be practiced in other embodiments. The invention is not intended to limit the scope of the invention, and the equivalent changes or modifications made by the invention without departing from the spirit of the invention should be included in the following. The towel is within the scope of the patent. - [Simple description of the drawing] Figure 1 is a schematic diagram of a conventional direct-lit backlight module; Figure 2 is a schematic cross-sectional view of the backlight module of the present invention; 3C is a top view of one of the backlight modules of the present invention, and the fourth side to the front side is the first (four)--the perspective view of the cold cathode device m · garden, . The top view of the backlight module is shown in the figure; and the sixth figure is a schematic diagram of the large liquid crystal display system of the present invention. [Main component symbol description] 100 direct type backlight module 110 outer frame 120 cold cathode fluorescent lamp 099115649 form No. A0101 No. 5 Page / Total 24 Page 0992027752-0 201142428 [0033] 130 diffuser [0034] 140 optical diaphragm [0035] 10 backlight module [0036] 11 outer frame [0037] 111 raised frame [0038] 112 bottom surface [0039] 113 vent [0040] 12 cold cathode device [0041 ] 121 cold cathode tube [0042] 122 electrode [0043] 123 transparent outer ring [0044] 1231 transparent outer ring end face [0045] 125 electrode [0046] 127 ring electrode [0047] 13 optical film [0048] 15 liquid crystal display No [0049] 16 Control System [0050] 161 Universal Slot [0051] 163 Network 埠 099115649 Form No. A0101 Page 16 / Total 24 Page 0992027752-0 201142428 [0052] 17 Ventilation Area [0053] 18 Transparent Cover [ 0054] 19A/19B air extractor [0055] 1 91 fan [0056] 1 large liquid crystal display system Ο Ο 099115649 Form No. 1010101 Page 17 / Total 24 Page 0992027752-0