1332818 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種平面顯示器，特別是指一種 散熱風道之平面顯示器。 八有 【先前技術】 ▲液晶顯示裝置等平面顯示器在朝薄型化發展過程中， 許多廠商逐漸將許多電子元件或控制功能整合成單晶片型 式，藉以縮減電路板所佔用之空間，然而，隨著晶片功率 的提高，電路板等發熱元件之發熱功率亦相對增加，在顯 ^器内部空間逐漸縮小的情況下，逐漸衍生出許多散熱問 題’而有待解決。 ❿ 如圖1、2所示，一般平面顯示器1大致包括-機殼u 、一嵌裝於機殼n上之顯示單元12、一固定於機殼u中 ^以固I電路板14之支揮架13，及—組裝於機殼u :,側壁乂:之風扇15’藉由該風扇15強制產生氣流，來將 、，顯不器1内部熱氣排出，然而，整個平面顯示器1溫 度上升的主因，絕大部分是由於前述電路板Μ運作時所散 逸出之熱量，習知設計單純透過風扇15作動而於機殼n内 2所產生之氣流則是分散於機殼u内部並無法集中氣流 冷卻真正需要冷卻之電路板14區域為了克服此部分之 缺失’廠商便開始採収大尺寸的風扇15來達到冷卻散熱 &而又增加生產製造成本，且亦僅能有限提升散 熱效率。 再者，為了方便電路板14能夠被安裝定位廠商必需 λ 5 1332818 另行設計該支樓帛13之結構，不冑增加組裝步驟亦會增加 平面顯示器1之製造成本。 【發明内容】 因此，本發明之目的，即在提供一種具有可有效提昇 散熱效率之散熱風道設計的平面顯示器。 本發明之另一目的，即在提供一種可減少組裝步驟且 兼具降低成本優點之平面顯示器。 於是，本發明具有散熱風道之平面顯示器，包含一機 殼、分別裝設於機殼上之一顯示單元與一風扇，及一組裝 於機殼中之電路板。該機殼包括一後侧壁開設有一安裝孔 的中空外殼體、一固接於外殼體後側壁内側面的内罩體， 及蓋封文裝孔地嵌裝固定於外殼體後側面之後蓋體，且 該内罩體與外殼體相配合界定出一具有一朝下開口，並與 女裝孔連通之散熱風道。該顯示單元是喪裝外露於外殼體 前侧面，並可用以顯示影像。該電路板是可用以控制該顯 不單元地組裝固定於散熱風道中。該風扇是固設於機殼上 ，且可被電路板驅動，而於散熱風道中產生將電路板之熱 氣排出機殼外的氣流。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 下配s參考圖式之六個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 月内谷中’類似的元件是以相同的編號來表示。 6 1332818 "、4所示’本發明具有散熱風道之平面顯示器的 第較佳實施例包含：一機殼3、-嵌裝外露於機殼3前側 面而用=顯不影像之顯示單元4、-組裝於機殼3中且可控 制顯不”單70 4之電路板5，及-嵌裝於機殼3上並可被電路 板5驅動之風扇6。在本實施例中，可於該機殼3底部加裝 腳架（圖未示），但實施時不以此為限。 該機殼3包括一中空外殼體31、一組裝固定於外殼體 31中的内罩體32，及一可拆離地蓋設於外殼體31後侧面 之後蓋體33，且該内罩體32與外殼體31相配合界定出一 開口 301朝下之散熱風道30。 該外殼體31具有一位於後方之後側壁3 i丨、一上下延 伸地開設於後側壁311上且與散熱風道3〇連通之安裝孔 312，以及多數開設於頂、底部之通風孔，該安裝孔 3 12是設計與該散熱風道3〇連通，用來供電路板$由外殼 體31後方置入散熱風道30内，而該等通風孔313則是呈 各自相互間隔分布，其中位於底部之通風孔313乃被設計 分別位於該散熱風道30之開口 3〇1下方，使機殼3外部之 空氣得以經由通風孔313與開口 3〇1進入散熱風道3〇内。 該内罩體32是設置於對應該安裝孔312之位置，本實 施例中，内罩體32是以一體成型方式固接於該外殼體31 之後側壁311内側面，且具有二左右間隔地位於安裝孔312 左、右側之側板部321、一固接於該等側板部321頂端間之 頂板部322，及一固接於側板部321與頂板部322前側邊之 安裝板部323，其中，安裝板部323是與安裝孔312前、後 7 1332818 相間隔’該等側板部321是由後侧壁3 11内侧面同體往前突 伸’而頂板部322則是水平突設於該後侧壁311内側面。 該後蓋體33是可拆離地卡嵌固定於外殼體31上，， 用來蓋封開設在後侧壁311上之安裝孔312，後蓋體33具 有一位於鄰近其頂端處之散熱孔330，及分別突設於其頂' 底側之二卡嵌部331 ’散熱孔330是貫穿其内外側面而與該 散熱風道30連通，而該後蓋體33嵌裝固定於外殼體31之 方式眾多，不以上述該等卡嵌部331之設計方式為限。 該顯示單元4嵌裝外露於外殼體31前侧面用以顯示晝 面’在本實施例中’該顯示單元4為液晶面板，由於顯示 單元4組裝固定於外殼體31上的方式眾多，亦非本發明之 改良重點’因此不再詳述。 該電路板5是自該外殼體31之安裝孔312置入該散熱 風道30中’並组裝固定於該内罩體32之安裝板部323上 ’而面向該安裝孔312,且藉由多數訊號線50與該顯示單 元4和風扇6電連接電連接。 該風扇6是覆蓋該散熱孔330地固設於該後蓋體33内 侧面’且相對位於該電路板5上方，並可被電路板5驅動 ’而於散熱風道30中產生將熱氣往上經由該散熱孔33〇排 出之氣流。 該平面顯示器使用時，該電路板5運作時所產生之熱 氣會被該内罩體32限制流動方向，而將熱氣集中於該散熱 風道30内，此時，組裝於後蓋體33上之風扇6經被電路 板5驅動後，會將散熱風道30中之熱氣往上由該散熱孔 8 1332818 穿其内外側面且對應位於該安裝孔312上方之散熱孔3i4, . ’域散熱孔314是與散熱風道30頂部連通。該風扇6是 覆蓋該散熱孔314地組裝固定於該外殼體31之後側壁311 内側面，並可被電路板5驅動，而將散熱風道Μ中之轨氣 經由該散熱孔314排出機殼3外，同樣可達到提高散熱效 率’而有效降低電路板溫度之目的。 如圖8所示，本發明具有散熱風道之平面顯示器之第 φ 三較佳實施例與第二實施例之差異處僅在於：該内罩體32 _ 之結構設計與該風扇6之設置位置。為方便說明，在以下 實施例忒明中，將僅針對本實施例與第二實施例差異處進 行說明》 在本實施例中，該内罩體32未設置頂板部322，且該 等側板部321與安裝板部323是分別往上延伸固接於外殼 體31之頂壁315内側面，該風扇6是覆蓋該通風孔313地 組裝固定於外殼體31之頂壁315内側面，而將散熱風道3〇 # 中之熱氣經由該通風孔313往上排出，同樣可達到提高散 熱效率’而有效降低電路板溫度之目的。且實施時，該等 對應位於風扇6上方之通風孔313亦可對應設計成圓形， 且提高整體散熱效果，可於該散熱風道3〇所包圍之外殼體 31頂壁315内側面區域設置多數個風扇6。 如圖9所示’本發明具有散熱風道之平面顯示器之第 四較佳實施例與第一實施例之差異處僅在於：該内罩體32 之結構設計。 在本實施例中，該内罩體32是設計成可拆離外殼體3 1 10 1332818 之形式’該内罩冑32具有二左右間隔的直立第一鎖板部 • 324 ' 一固接於該等第-鎖板部324頂端間之第二鎖板部 325、二分別自該等第—鎖板部324左右相向侧邊往前突伸 人外殼體31巾之側板部321、一固接於該等側板部321頂 端間之頂板部322,及-固接於該等側板部321與項板部 322間且間隔面向該安裝孔312之直立安裝板部323。 該内罩體32與外殼體31組裝時，是將該内罩體32往 • 前嵌入該安裝孔312 +，直至該等鎖板部324、奶限位靠 - &於後侧壁311，最後，再以多數螺絲200將該鎖接板部 324鎖固於該後側壁311，便完成内罩體32之組裝，特別說 明的是，藉由螺絲來加以固定之方式相當多，並不以前述 方式為限。 如圖10、11所示，本發明具有散熱風道之平面顯示器 之第五較佳實施例與第一實施例之差異處僅在於：該内罩 體32之結構設計。 • 在本實施例中，該内罩體32之該等側板部321與頂板 部322皆未固接於外殼體31之後側壁311，且該内罩體32 還具有一自該後側壁311的安裝孔312頂緣及左、右側緣一 體往前突伸之圍板部326,及二分別自該圍板部326兩底端 左右相向延伸且一體固接於該後側壁311之底板部328，該 等側板部321是分別自該等底板部328相向端一體往上延 伸，且與該圍板部326相間隔，而該頂板部322是固接於 該等側板部321頂端間，且與該圍板部326相間隔，該安 裝板部323則是一體跨接於該圍板部326、底板部328、側 11 Ϊ332818 板部321與頂板部322前側邊之間，且該圍板部326頂側 * 開設有數個氣孔327 ’而該等底板部328亦分別開設有一貫 , 穿其頂底面之氣孔329。 該等侧板部321、頂板部322與安裝板部323和該外殼 體31相配合界定出該散熱風道3〇，而該等側板部321、底 板部328、頂板部322、圍板部326與安裝板部323和該外 殼體31，則相配合界定出一開口朝後且與安裝孔3 12連通 鲁之倒U字型安裝空間320。該後蓋體33是蓋封安裝孔312 地蓋設於該後側壁311上，而同時蓋封散熱風道3〇與該安 裝空間320。 透過該内罩體32之結構設計，可將具有主要發熱元件 之電路板5設置於該散熱風道30中，而將其它較不易發熱 之電路板5設置該安裝板部323位於該安裝空間320中之 部位，同樣可藉由該風扇6產生之散熱氣流，將散熱風道 3〇中之熱氣經由該散熱孔330排出，可達到提高散熱效率 φ 與有效降低電路板5溫度之目的，而設置在安裝空間32〇 之其它電路板5產生之少量熱氣，亦可隔離在安裝空間32〇 内，並透過該等氣孔327、329與該等通風孔313間之自然 空氣對流排出機殼3外。 如圖12所示’本發明具有散熱風道之平面顯示器之第 六較佳實施例與第五實施例之差異處僅在於：該内罩體32 之結構設計。在本實施例中，該内罩體32是設計成可拆離 外殼體31的態樣，該内罩體32還具有二左右間隔之直立 第一鎖板部324，及一固接於該等第一鎖板部324頂端間之 12 1332818 第二鎖板部325 ’且該圍板部326是自該等第—鎖板部324 相向側邊與該第二鎖板部325底邊往前突伸。 該内罩體32組裝時，同樣是將内罩體32往前嵌入安 裝孔312中，直至該等鎖板部324、325限位靠抵於後側壁 311後側面，然後再以多數螺絲2〇〇將該等鎖板部324、325 鎖固於該後側壁311上。 歸納上述，透過於外殼體31中設置該内罩體32，且將 電路板5安裝固定在外殼體31與内罩體32相配合界定出 之散熱風道30中的結構設計，可使電路板5產生之熱氣集 中在散熱風道30中，並藉由裝設在外殼體31或後蓋體33 上之風扇6,將散熱風道3〇中之熱氣直接排出機殼3外， 進而可提高散熱效率，且該風扇6可將較低溫之外部空氣 自散熱風道30底部開口而往上吸經該電路板5，進而有效 降低電路板5溫度。再者，透過將電路板5組裝固定於一 體成型在外殼體31中的内罩體32之結構設計，還可省掉 習知顯平面示器1所使用之金屬支撐架13構件，所以可相 對降低平面顯示器之製造成本。相當方便實用。因此，確 實可達到本發明之目的。 惟以上所述者’僅為本發明之六較佳實施例而已，當 不旎以此限定本發明實施之範圍，即大凡依本發明申請專 利範圍及發明說明内容所作之簡單的等效變化與修飾，皆 仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1疋一般裝有風扇之平面顯示器的立體圖； 13 1332818 【主要元件符號說明】 200··.. ....螺絲 323.... ....安裝板部 3....... ....機殼 324.... ....第一鎖板部 30 ..... ....散熱風道 325.... ····第二鎖板部 301.... ····開口 326.... …·圍板部 31 ..... ....外殼體 327.... —氣孔 311·... ....後側壁 328·.·· ....底板部 312·.·. ....安裝孔 329.... ....氣孔 313..·. ....通風孔 33 …·， ....後蓋體 314.... ....散熱孔 330.... ....散熱孔 315.... ....頂壁 331.··· ....卡嵌部 32 ..... ....内罩體 4....... •…顯示單元 320.... ....安裝空間 5....... ....電路板 321.... ....側板部 50 …·· ....訊號線 322.... ----頂板部 6....... —風扇1332818 IX. Description of the Invention: [Technical Field] The present invention relates to a flat panel display, and more particularly to a flat panel display for a heat dissipating air passage. Eight [Previous Technology] ▲In the development of thin-film display devices such as liquid crystal display devices, many manufacturers have gradually integrated many electronic components or control functions into a single-chip type, thereby reducing the space occupied by the circuit board. As the power of the chip increases, the heating power of the heating elements such as the circuit board also increases relatively. In the case where the internal space of the display device is gradually reduced, many heat dissipation problems are gradually derived, which remains to be solved. As shown in FIG. 1 and FIG. 2, the general flat panel display 1 generally includes a casing u, a display unit 12 embedded in the casing n, and a support fixed to the casing u to support the circuit board 14. The frame 13 and the assembly of the casing u:, the side wall 乂: the fan 15' is forced to generate airflow by the fan 15, to discharge the hot air inside the display unit 1, however, the main cause of the temperature rise of the entire flat display 1 Most of the heat is dissipated by the operation of the circuit board. The airflow generated by the fan 15 and the airflow generated in the casing n is dispersed inside the casing u and cannot be cooled by the airflow. In order to overcome the lack of this part of the board 14 area that really needs to be cooled, the manufacturer began to collect the large-sized fan 15 to achieve cooling and cooling, and increased the manufacturing cost, and only limitedly improved the heat dissipation efficiency. Moreover, in order to facilitate the structure of the board 14 to be installed by the positioning manufacturer, λ 5 1332818, the structure of the building block 13 is separately designed, and the manufacturing cost of the flat panel display 1 is increased without increasing the assembly steps. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a flat panel display having a heat dissipation air passage design that can effectively improve heat dissipation efficiency. Another object of the present invention is to provide a flat panel display which can reduce the number of assembly steps and which has the advantage of reducing cost. Therefore, the flat panel display having the heat dissipating air passage of the present invention comprises a casing, a display unit and a fan respectively mounted on the casing, and a circuit board assembled in the casing. The casing comprises a hollow outer casing with a mounting hole formed on the rear side wall, an inner cover body fixed to the inner side surface of the rear side wall of the outer casing body, and the cover body is embedded and fixed on the rear side surface of the outer casing body. And the inner cover body cooperates with the outer casing body to define a heat dissipation air passage having a downward opening and communicating with the female hole. The display unit is exposed to the front side of the outer casing and can be used to display images. The circuit board can be assembled and fixed in the heat dissipation air duct by controlling the display unit. The fan is fixed to the casing and can be driven by the circuit board to generate airflow from the heat dissipation air duct outside the casing. [Embodiment] The foregoing and other technical contents, features and advantages of the present invention will be apparent from the detailed description of the preferred embodiments of the accompanying drawings. Before the present invention is described in detail, it is to be noted that the like elements in the following description are denoted by the same reference numerals. 6 1332818 ", 4 shows a preferred embodiment of the flat panel display having the heat dissipating air passage of the present invention comprising: a casing 3, a display unit that is embedded in the front side of the casing 3 and used to display images 4, - is assembled in the casing 3 and can control the circuit board 5 of the single 70 4, and the fan 6 embedded in the casing 3 and can be driven by the circuit board 5. In this embodiment, A tripod (not shown) is attached to the bottom of the casing 3, but is not limited thereto. The casing 3 includes a hollow outer casing 31 and an inner casing 32 assembled and fixed in the outer casing 31. And a cover body 33 detachably disposed on the rear side of the outer casing 31, and the inner cover body 32 cooperates with the outer casing 31 to define a heat dissipation air passage 30 with an opening 301 facing downward. The outer casing 31 has a a mounting hole 312 which is open on the rear side wall 311 and communicates with the heat dissipating air passage 3, and a plurality of vent holes which are formed in the top and bottom, and the mounting hole 3 12 is designed and The heat dissipation air duct 3 is connected to the circuit board for inserting the circuit board into the heat dissipation air duct 30 from the rear of the outer casing 31, and the ventilation holes are 313 is disposed at a distance from each other, wherein the venting holes 313 at the bottom are designed to be respectively located below the opening 3〇1 of the heat dissipating duct 30, so that the air outside the casing 3 can pass through the vent 313 and the opening 3〇1. The inner cover body 32 is disposed at a position corresponding to the mounting hole 312. In the embodiment, the inner cover body 32 is integrally fixed to the inner side of the side wall 311 after the outer casing 31. And having a side plate portion 321 located at the left and right sides of the mounting hole 312 at two intervals, a top plate portion 322 fixed between the top ends of the side plate portions 321 , and a front side portion fixed to the front side portion of the side plate portion 321 and the top plate portion 322 The mounting plate portion 323, wherein the mounting plate portion 323 is spaced apart from the front and rear of the mounting hole 312 by 7 1332818. The side plate portions 321 are protruded forward from the inner side surface of the rear side wall 3 11 and the top plate portion 322 The rear cover body 33 is detachably engaged with the outer casing 31, and is used for sealing the mounting hole 312 formed in the rear side wall 311. The rear cover body 33 has a heat dissipation hole 330 located adjacent to the top end thereof, and The heat dissipation hole 330 protrudes from the inner and outer sides of the top portion of the top portion of the top portion of the bottom portion of the bottom portion of the bottom portion of the bottom portion of the bottom portion. The rear cover body 33 is embedded and fixed to the outer casing 31. The display unit 4 is embedded in the front side of the outer casing 31 for displaying the rear surface. In the present embodiment, the display unit 4 is a liquid crystal panel due to the display unit. 4 The method of assembling and fixing to the outer casing 31 is numerous and is not a modification of the present invention. Therefore, the circuit board 5 is inserted into the heat dissipation duct 30 from the mounting hole 312 of the outer casing 31. The mounting plate portion 323 of the inner cover body 32 is assembled to face the mounting hole 312, and is electrically connected to the display unit 4 and the fan 6 by a plurality of signal lines 50. The fan 6 is fixed to the inner side surface of the rear cover 33 and covers the upper surface of the rear cover 33 and is opposite to the circuit board 5 and can be driven by the circuit board 5 to generate hot air in the heat dissipation air channel 30. The airflow discharged through the heat dissipation holes 33〇. When the flat panel display is in use, the hot air generated during operation of the circuit board 5 is restricted by the inner cover body 32, and the hot air is concentrated in the heat dissipation air passage 30. At this time, it is assembled on the rear cover body 33. After the fan 6 is driven by the circuit board 5, the hot air in the heat dissipation air channel 30 is passed through the heat dissipation hole 8 1332818 through the inner and outer sides thereof and corresponding to the heat dissipation hole 3i4 above the mounting hole 312. It is connected to the top of the heat dissipation duct 30. The fan 6 is assembled and fixed to the inner side surface of the side wall 311 after being covered and fixed to the heat dissipation hole 314, and can be driven by the circuit board 5, and the rail gas in the heat dissipation air passage is discharged to the casing through the heat dissipation hole 314. In addition, the same can achieve the purpose of improving the heat dissipation efficiency and effectively reducing the temperature of the board. As shown in FIG. 8, the difference between the third preferred embodiment of the flat display having the heat dissipating air passage and the second embodiment is only that the structural design of the inner cover 32 _ and the position of the fan 6 are set. . For convenience of description, in the following embodiments, only the difference between the present embodiment and the second embodiment will be described. In the present embodiment, the inner cover body 32 is not provided with the top plate portion 322, and the side plate portions are provided. The 321 and the mounting plate portion 323 are respectively extended upwardly and fixed to the inner side surface of the top wall 315 of the outer casing 31. The fan 6 is assembled and fixed to the inner side surface of the top wall 315 of the outer casing 31 so as to cover the venting hole 313. The hot air in the air passage 3〇# is discharged upward through the vent hole 313, and the heat dissipation efficiency can also be improved to effectively reduce the temperature of the circuit board. In the implementation, the venting holes 313 corresponding to the fan 6 may be correspondingly designed to be circular, and the overall heat dissipation effect is improved, and the inner side of the top wall 315 of the casing 31 may be disposed outside the heat dissipation air duct 3〇. Most fans 6. As shown in Fig. 9, the fourth preferred embodiment of the flat panel display having the heat dissipating duct of the present invention differs from the first embodiment only in the structural design of the inner cover body 32. In the present embodiment, the inner cover body 32 is designed to be detachable from the outer casing 3 1 10 1332818. The inner cover 胄 32 has two vertical left and right lock plate portions 324 ′ The second lock plate portion 325 between the top end of the first lock plate portion 324 and the second side plate portion 321 of the outer cover of the first and second lock plate portions 324 protrude forwardly from the side plate portion 321 of the human outer casing 31, respectively. The top plate portion 322 between the top ends of the side plate portions 321 and the upright mounting plate portion 323 that is fixed between the side plate portions 321 and the main plate portion 322 and spaced apart from the mounting hole 312. When the inner cover body 32 is assembled with the outer casing 31, the inner cover body 32 is inserted into the mounting hole 312+ until the lock plate portion 324 and the milk limit position are on the rear side wall 311. Finally, the locking plate portion 324 is locked to the rear side wall 311 by a plurality of screws 200, and the assembly of the inner cover body 32 is completed. In particular, the manner of fixing by the screws is quite large, and the method is not The foregoing method is limited. As shown in Figs. 10 and 11, the fifth preferred embodiment of the flat-panel display having a heat dissipating duct of the present invention differs from the first embodiment only in the structural design of the inner shroud 32. In this embodiment, the side plate portions 321 and the top plate portion 322 of the inner cover body 32 are not fixed to the rear side wall 311 of the outer casing 31, and the inner cover body 32 further has a mounting from the rear side wall 311. The top edge portion 326 of the hole 312 and the left and right side edges integrally projecting forwardly, and the bottom plate portion 328 extending from the bottom end of the surrounding plate portion 326 and being integrally fixed to the bottom plate portion 328 of the rear side wall 311, respectively The side plate portions 321 extend integrally from the opposite ends of the bottom plate portions 328 and are spaced apart from the surrounding plate portion 326, and the top plate portion 322 is fixed between the top ends of the side plate portions 321 and the same The portion 326 is spaced apart, and the mounting plate portion 323 is integrally bridged between the panel portion 326, the bottom plate portion 328, the side 11 Ϊ 332818, the plate portion 321 and the front side portion of the top plate portion 322, and the top side of the panel portion 326 * A plurality of air holes 327' are opened, and the bottom plate portions 328 are also respectively opened with air holes 329 passing through the top surface of the top. The side plate portion 321 and the top plate portion 322 cooperate with the mounting plate portion 323 and the outer casing 31 to define the heat dissipating air passage 3 , and the side plate portion 321 , the bottom plate portion 328 , the top plate portion 322 , and the surrounding plate portion 326 . The mounting plate portion 323 and the outer casing 31 cooperate to define an inverted U-shaped mounting space 320 with an opening facing rearward and communicating with the mounting hole 3 12 . The rear cover body 33 is covered by the cover sealing hole 312 on the rear side wall 311, and at the same time covers the heat dissipation air passage 3 and the installation space 320. Through the structural design of the inner cover body 32, the circuit board 5 having the main heat generating component can be disposed in the heat dissipation air channel 30, and the other less heat-generating circuit board 5 is disposed. The mounting board portion 323 is located in the installation space 320. In the middle portion, the hot air generated by the fan 6 can also be used to discharge the hot air in the heat dissipating air passage 3 through the heat dissipation hole 330, thereby achieving the purpose of improving the heat dissipation efficiency φ and effectively reducing the temperature of the circuit board 5, and setting The small amount of hot air generated by the other circuit boards 5 in the installation space 32 can also be isolated in the installation space 32 , and convected outside the casing 3 through the natural air convection between the air holes 327, 329 and the vent holes 313. As shown in Fig. 12, the sixth preferred embodiment of the flat panel display having the heat dissipating duct of the present invention differs from the fifth embodiment only in the structural design of the inner cover body 32. In this embodiment, the inner cover body 32 is designed to be detachable from the outer casing 31. The inner cover body 32 further has an upright first lock plate portion 324 spaced apart from each other, and is fixed to the same. 12 1332818 between the top end of the first lock plate portion 324, the second lock plate portion 325 ′, and the wrap portion 326 protrudes from the opposite sides of the first lock plate portion 324 and the bottom edge of the second lock plate portion 325 Stretch. When the inner cover body 32 is assembled, the inner cover body 32 is also inserted into the mounting hole 312 in the front direction until the lock plate portions 324 and 325 are restrained against the rear side surface of the rear side wall 311, and then the plurality of screws 2 are used. The lock plate portions 324, 325 are locked to the rear side wall 311. In summary, the inner cover body 32 is disposed in the outer casing 31, and the circuit board 5 is mounted and fixed on the heat dissipation air duct 30 defined by the outer casing 31 and the inner cover body 32. 5 The generated hot air is concentrated in the heat dissipating air passage 30, and the hot air in the heat dissipating air passage 3 is directly discharged out of the casing 3 by the fan 6 mounted on the outer casing 31 or the rear cover body 33, thereby improving The heat dissipation efficiency, and the fan 6 can suck the lower temperature external air from the bottom of the heat dissipation air channel 30 and suck up the circuit board 5, thereby effectively reducing the temperature of the circuit board 5. Furthermore, by assembling and fixing the circuit board 5 to the structural design of the inner cover body 32 integrally formed in the outer casing 31, the metal support frame 13 used in the conventional display plane 1 can be omitted, so that the plane can be relatively lowered. The manufacturing cost of the display. Quite convenient and practical. Therefore, the object of the present invention can be achieved. However, the above description is only for the six preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes made according to the scope of the invention and the description of the invention. Modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a flat panel display with a fan; 13 1332818 [Description of main components] 200··.. .... screw 323.... .............The casing 324.....The first lock plate portion 30 ..... ....The heat dissipation air duct 325.... ···· Two lock plate portions 301.... ···· Openings 326....·Ward plate portions 31 ..... .... outer casing 327.... — air holes 311·... .. rear side wall 328····.. bottom plate portion 312·..... mounting hole 329..... air hole 313..·..... vent hole 33 ...· , .... rear cover body 314...... heat dissipation hole 330...... heat dissipation hole 315..... top wall 331.··· .... Card fitting portion 32 ..... .... inner cover body 4...........display unit 320......installation space 5....... . Circuit board 321 . . . . side plate portion 50 ..... .... signal line 322.... ---- top plate portion 6..
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