200848870 九、發明說明： . 【發明所屬之技術領域】 本發明係有關於一種背光模組及液晶顯示器，特別是有關於一種採 用發光二極體（LED)作為光源的背光模組及使用該背光模組之液晶顯 示器。 【先前技術】 按’背光模組（BacklightModule)係應用於液晶顯示器（LCD)， 其功能在於給液晶顯示器之液晶顯示面板（LCDPanel)提供一均勻、 高亮度的光源，使其能夠正常顯示影像。背光模組之主要光源通常有 冷陰極燈管（Cold Cathode Fluorescent Lamp，CCFL)及發光二極體 (LED)，其中冷陰極燈管具有電氣及光學特性安定、壽命長、耐震、 耐衝擊等優勢，但冷陰極燈f也有好缺點，如不觀魏、啓動時 會產生電磁輻射、低溫段工作效能差、驅動電壓高等等，而且更爲主 要的是，由於受限於冷陰極燈管之製程，其燈管尺寸很難做得更細， 、 所以若在背光模組上採用冷陰紐管作爲光源，則背光模組之厚度就 很難改善。例如：麟筆記本電腦之冷陰極燈管之燈管餘最小爲L8 公釐，楔形導光板的入光侧必須維持Μ公釐，最終整體背光模組之厚 度將達5公m;若將冷陰極燈管細於監視器、液晶電視等大尺 寸的《顯稀置巾，職齡光觀之厚度將會高輕少丨公分。 總之，冷陰極燈管的先天條件決定其背光触之厚度—定會大於5公 、另外無理特性上亦有諸多缺陷。故，有必要使用新的光 源，來取代習知之光源，藉以消除習知光源所衍生的問題及困擾。 5 200848870 發光二極體（LED)作爲一種新型光源，以其低供電電壓，低功耗， 長奇命，無輻射等特點，在許多場合都有相當良好的應用。隨著近年 來發光一極體發光免度的不斷提升，特別是超高亮度發光二極體的出 現，使發光一極體的應用更為廣泛。例如，用發光二極體作爲背光光 源來取代手持裝置原有的電激發光片（EL)背光、冷陰極燈管（Ccfl) 背光，不僅可使得電路設計更為簡潔容易，且可具有較高的外力抗受 性。當發光一極體應用於手持裝置上時，如個人數位助理器（PDA)、 數位相機、手機等，因小型螢幕背光所需之發光二極體數量較少，故 一般均採用軟性電路板（FPC)作爲電氣載體。但在大尺寸背光上使用 發光二極體時，因需要産生高輝度，因此所需的發光二極體數量必須 增加甚多，甚至達到兩倍以上，相應之光源熱量亦會增加，此時若繼 續採用軟性電路板作爲電氣載體，由於軟性電路板之硬度不足，所承 載的發光二極體數量越多就越難保證軟性電路板的平整性，因而會導 致發光二極體之裝載位置高低不同，而影響整體光源的均勻性。故， 習知以軟性電路板作爲發光二極體的電氣載體的小螢幕背光結構並不 能直接適用於大尺寸液晶顯示裝置上。 在較大尺寸的液晶顯示裝置中，背光模組通常採用硬度較好的普通 電路板(FPC)，甚至金屬基電路板（MCPCB)作為發光二極體的載體， 如第1圖中所示。該習知液晶顯示器900中的複數發光二極體91放置 於導光板90的一個侧面，而承載發光二極體91的電路板93位於導光 板90的側面的下方，而液晶顯示面板92蓋於導光板9〇的上方。反射 6 200848870 片94係配置於導光板9〇之下方，可將自導光板9〇底部漏出的光線反 射回導光板90中’以提高光使用率。複數光學薄膜％係疊置於導光 板90之光出射面，以雜正自導光板9〇的光出射面射出之光線。然 此習知液晶顯示器的厚度則至少為液晶顯示面板92、導光板9〇、反射 片94、複數光學_ 95和電路板93轉度之和，再加上外部的框架 的厚度，實不符合當今的電子產品_化的趨勢。故，有必要改良發 光二極體的背光模組，以期獲得更加理想的產品。 【發明内容】 本發明之主要目的在於提供—繼姆湊的背細組及使用該背 光模組的液晶齡器，從而使整做晶顯示器具有較小的厚度。 本發明的其他目的和優點可以從本發明所揭露的技術特徵中得到 進一步的了解。 為達上述之一或部份或全部目的或是其他目的，本發明一實施 例提供-種背光顯，包含有—導絲、—發光二極體陣列光源、一 反射片、至少-光學細，以及—框架，其中導絲具有—光入射面、 一下表面及-光出射面；發光三極體_光源係配置於導光板之光入 射面的旁側，發光—極體陣列光源包含有複數個具有發光面之發光二 極體及-承載這些發光二極體之電路板；反射片係配置於導光板之下 表面的下方，·光學_係配置於導光板之光出射_上方；以及框架 係用以承載上述構件，其具有複數邊框及—底壁，反射片係位於該框 '、卷光一極體陣列光源係位於框架之其中一邊框處，並且發 光-極體係位於電路板之下方，而發光二極體之發光面係朝向導光板 7 200848870 之光入射面。 依據本發明之上述目的，本發明另一實施例提供一種液晶顯示器， 包含有一導光板、一發光二極體陣列光源、一反射片、至少一光學薄 膜、一框架，以及一液晶顯示面板，其中導光板具有一光入射面、一 下表面及一光出射面；發光二極體陣列光源係配置於導光板之光入射 面的旁側，發光二極體陣列光源包含有複數個具有發光面之發光二極 體及-承載該等發光二極體之電路板；反射片係配置於該導光板之光 擴散面的下方；光學薄膜係配置於該導光板之光出射面的上方；框架 係用以承載上述構件，其具有複數邊框及—底壁，反射#係位於框架 之底壁，發光二極體_絲係位於框架之其巾_邊框處，並且發光 二極體係位於板之下方，而這些發光二鋪之發光面係朝向導光 板之光入射面，框架輿光學薄膜的上方定義出—空腔，液晶顯示面板 係收容於框架之空腔内。 / \ 與本發明之先前技術相比較，本發明背光模組及液晶顯示器之發光 二極體陣列光源係倒裝於框架内，即其發光二極體係錄電路板之下 方，使得電路板的上表面(即與承载發光二極體之面相反的另一面)至液 晶顯示面板的外表面之間_直_，小於電路板厚度和液晶顯示面 板厚度之和，即至少有1分液晶顯示面板之厚度可以與該光源之電 路板之厚度相抵消，從而達到降低高度及結構緊凑的目的。 【實施方式】 以下實施例中所提到的方向用語 等 列如·上、下、左、右、前或後 ，僅是參考附加圖式的方向。因此 1之用的方向用語是用來說明並 8 200848870 非用來限制本發明。 凊參照第2至5圖所示，本發明背光模組i包含有一導光板1〇、 一發光二極體陣列光源2〇、一反射片3〇、數層光學薄膜4〇及一框架 50。 導光板10係用以導引光線方向，其具有一光入射面U、一下表面 12，以及一光出射面13。 發光二極體陣列光源20係配置於導光板1〇之光入射面n旁，其 包含有複數個發光二極體21 (見第4圖），及用來承載發光二極體21 的硬質的電路板22，其中電路板22可以爲金屬基電路板（MCPCB)， 其不但可以作爲發光二極體21之電氣載體，還可以作爲發光二極體21 之熱傳導載體，藉由電路板22可將發光二極體21産生的熱量傳導至 其他構件（如後述之金屬件60 )。在本實施例中，電路板22係呈條狀， 具有一定的厚度，發光二極體21呈直線型排列於電路板22之表面。 在將發光二極體陣列光源20裝設於框架5〇上時，發光二極體21係位 於電路板22之下表面，且發光二極體21之發光面21〇係朝向導光板 10之光入射面11。 反射片3〇係配置於導光板10之下方，並貼靠於導光板之下表 面12，可將自導光板10底部漏出的光線反射回導光板1〇中，以提高 光使用率。 數層光學薄膜40係疊置於導光板1〇之光出射面13，以供修正自 導光板10的光出射面13射出之光線，這些光學薄膜4〇可以是擴散膜 9 200848870 及稜鏡片等。[Technical Field] The present invention relates to a backlight module and a liquid crystal display, and more particularly to a backlight module using a light emitting diode (LED) as a light source and using the backlight Module LCD display. [Prior Art] Pressing Backlight Module is applied to a liquid crystal display (LCD). Its function is to provide a uniform, high-brightness light source to the liquid crystal display panel (LCDPanel) of the liquid crystal display, so that it can display images normally. The main light source of the backlight module usually has a Cold Cathode Fluorescent Lamp (CCFL) and a light-emitting diode (LED). The cold cathode lamp has the advantages of stable electrical and optical properties, long life, shock resistance and impact resistance. However, the cold cathode lamp f also has good shortcomings, such as not seeing the Wei, generating electromagnetic radiation when starting, poor working performance in the low temperature section, high driving voltage, etc., and more importantly, due to the limitation of the process of the cold cathode lamp. The size of the lamp tube is difficult to be made thinner, so if the cold cathode tube is used as the light source on the backlight module, the thickness of the backlight module is difficult to be improved. For example, the minimum of the lamp tube of the cold cathode lamp of Lin notebook computer is L8 mm, and the entrance side of the wedge-shaped light guide plate must be maintained at Μ mm, and the thickness of the overall backlight module will reach 5 m; The lamp is thinner than the large-sized "slim towel" such as monitors and LCD TVs. The thickness of the service age will be higher and lighter than the centimeters. In short, the innate conditions of the cold cathode lamp determine the thickness of the backlight contact - it will be greater than 5 metrics, and there are also many defects in the irrational properties. Therefore, it is necessary to use a new light source instead of the conventional light source to eliminate the problems and problems caused by the conventional light source. 5 200848870 Light-emitting diode (LED) as a new type of light source, with its low supply voltage, low power consumption, long life, no radiation, etc., has a very good application in many occasions. With the continuous improvement of the luminous illuminance in recent years, especially the appearance of ultra-high-brightness light-emitting diodes, the application of the light-emitting body is more extensive. For example, the use of a light-emitting diode as a backlight source to replace the original electro-optic (EL) backlight and cold cathode lamp (Ccfl) backlight of the handheld device can not only make the circuit design simpler and easier, but also has a higher The external force resists. When a light-emitting body is applied to a handheld device, such as a personal digital assistant (PDA), a digital camera, a mobile phone, etc., since a small number of light-emitting diodes are required for a small screen backlight, a flexible circuit board is generally used ( FPC) as an electrical carrier. However, when a light-emitting diode is used on a large-sized backlight, since a high luminance is required, the number of light-emitting diodes required must be increased to a large amount, or even more than twice, and the heat of the light source is also increased. Continue to use the flexible circuit board as the electrical carrier. Because the hardness of the flexible circuit board is insufficient, the more the number of light-emitting diodes carried, the more difficult it is to ensure the flatness of the flexible circuit board, which will result in different loading positions of the light-emitting diodes. And affect the uniformity of the overall light source. Therefore, it is conventionally known that a small screen backlight structure using a flexible circuit board as an electrical carrier of a light-emitting diode is not directly applicable to a large-sized liquid crystal display device. In a larger-sized liquid crystal display device, the backlight module usually uses a normal circuit board (FPC) having a relatively good hardness, and even a metal-based circuit board (MCPCB) is used as a carrier of the light-emitting diode, as shown in FIG. The plurality of LEDs 91 in the conventional liquid crystal display 900 are placed on one side of the light guide plate 90, and the circuit board 93 carrying the LEDs 91 is located below the side surface of the light guide plate 90, and the liquid crystal display panel 92 is covered by Above the light guide plate 9〇. Reflection 6 200848870 The film 94 is disposed below the light guide plate 9〇, and can reflect the light leaked from the bottom of the light guide plate 9〇 back into the light guide plate 90 to improve the light utilization rate. The plurality of optical films are stacked on the light exit surface of the light guide plate 90 to illuminate the light emitted from the light exit surface of the light guide plate 9. However, the thickness of the conventional liquid crystal display is at least the sum of the degrees of rotation of the liquid crystal display panel 92, the light guide plate 9, the reflection sheet 94, the plurality of optical _95, and the circuit board 93, and the thickness of the outer frame does not conform to The trend of today's electronic products. Therefore, it is necessary to improve the backlight module of the light-emitting diode in order to obtain a more ideal product. SUMMARY OF THE INVENTION The main object of the present invention is to provide a retort and a liquid crystal age device using the backlight module, so that the crystal display has a small thickness. Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a backlight display including a guide wire, a light emitting diode array light source, a reflective sheet, and at least an optical thin. And a frame, wherein the guide wire has a light incident surface, a lower surface, and a light exit surface; the light emitting diode_light source is disposed on a side of the light incident surface of the light guide plate, and the light emitting body array light source includes a plurality of a light-emitting diode having a light-emitting surface and a circuit board carrying the light-emitting diodes; the reflective sheet is disposed below the lower surface of the light guide plate, and the optical system is disposed above the light exit_ of the light guide plate; and the frame system For carrying the above-mentioned member, which has a plurality of frames and a bottom wall, the reflective sheet is located at the frame, and the light-emitting one-pole array light source is located at one of the frames of the frame, and the light-emitting system is located below the circuit board, and The light emitting surface of the light emitting diode faces the light incident surface of the light guide plate 7 200848870. According to the above object of the present invention, another embodiment of the present invention provides a liquid crystal display including a light guide plate, a light emitting diode array light source, a reflective sheet, at least one optical film, a frame, and a liquid crystal display panel. The light guide plate has a light incident surface, a lower surface and a light exit surface; the light emitting diode array light source is disposed on a side of the light incident surface of the light guide plate, and the light emitting diode array light source comprises a plurality of light emitting surfaces having a light emitting surface a diode and a circuit board carrying the light emitting diodes; the reflective sheet is disposed below the light diffusing surface of the light guiding plate; the optical film is disposed above the light emitting surface of the light guiding plate; Carrying the above-mentioned member, which has a plurality of frames and a bottom wall, the reflection # is located at the bottom wall of the frame, the light-emitting diode_wire is located at the towel frame of the frame, and the light-emitting diode system is located below the plate, and these The light-emitting surface of the light-emitting two-story is directed toward the light incident surface of the light guide plate, and the cavity is defined above the frame 舆 optical film, and the liquid crystal display panel is housed in the space of the frame Inside. Compared with the prior art of the present invention, the backlight module of the present invention and the light-emitting diode array of the liquid crystal display are flip-chip mounted in the frame, that is, under the light-emitting diode recording circuit board, so that the circuit board is The surface (ie, the other side opposite to the surface carrying the light-emitting diode) is between the outer surface of the liquid crystal display panel, which is smaller than the sum of the thickness of the circuit board and the thickness of the liquid crystal display panel, that is, at least 1 minute of the liquid crystal display panel The thickness can be offset by the thickness of the circuit board of the light source, thereby achieving the purpose of reducing the height and compactness. [Embodiment] The directional terms mentioned in the following embodiments, such as upper, lower, left, right, front or rear, refer only to the direction of the additional drawing. Therefore, the directional term used herein is used to describe and 8 200848870 is not intended to limit the invention. Referring to Figures 2 to 5, the backlight module i of the present invention comprises a light guide plate 1 , a light-emitting diode array light source 2 , a reflection sheet 3 , a plurality of optical films 4 , and a frame 50 . The light guide plate 10 is for guiding the light direction, and has a light incident surface U, a lower surface 12, and a light exit surface 13. The light emitting diode array light source 20 is disposed beside the light incident surface n of the light guide plate 1 , and includes a plurality of light emitting diodes 21 (see FIG. 4 ) and a hard surface for carrying the light emitting diodes 21 . The circuit board 22, wherein the circuit board 22 can be a metal-based circuit board (MCPCB), can be used not only as an electrical carrier of the light-emitting diode 21 but also as a heat conduction carrier of the light-emitting diode 21, which can be The heat generated by the light-emitting diode 21 is conducted to other members (such as the metal member 60 described later). In the present embodiment, the circuit board 22 is strip-shaped and has a certain thickness, and the light-emitting diodes 21 are linearly arranged on the surface of the circuit board 22. When the light emitting diode array light source 20 is mounted on the frame 5, the light emitting diode 21 is located on the lower surface of the circuit board 22, and the light emitting surface 21 of the light emitting diode 21 is directed toward the light guiding plate 10. Incident surface 11. The reflective sheet 3 is disposed under the light guide plate 10 and abuts against the lower surface 12 of the light guide plate, and reflects light leaking from the bottom of the light guide plate 10 back into the light guide plate 1 to improve light utilization. The plurality of optical films 40 are stacked on the light exit surface 13 of the light guide plate 1 for correcting the light emitted from the light exit surface 13 of the light guide plate 10. The optical films 4 may be a diffusion film 9 200848870 and a wafer. .
框架5〇係用以承載上述所有構件。在本實施例中，框架％係一塑 膠框架，具有四個邊框5卜52、53及54及—例如是鏤空的底壁％。 於其他實施财’底壁55不需要鏤空。與習知技術減，上述發光二 極體陣列絲20係以電路板22錄發光二祕21上方财式安襄於 框架5〇之其中—邊框51處（見第5圖 >請詳細参瞻圖及第3圖， 邊框51 _上方設有—定位邊％，其與邊框51在水平和垂直方向上 白相刀離因此定位邊56與邊框51之間形成有。如第$圖 矛第6®所不’發光一極體陣列光源2〇之電路板22位於定位邊兄的 外側和邊框51上方之空間，而發光二極體陣列光源2〇之發光二極體 21則位於定位邊56與邊框51之_猶57内，且本實施例中的發光 二極體21為側發光型發光二極體，從而發光二極體21發射出之光線 可以自間隙57射出。上述反射片30係、安裝於框架5G之底壁55上， 並且反射片30之-端插置於發光二極體21之下方的預留位置。而導 光板10係水平插人定位邊56的下方（見第5圖），以供定位，並與發 光-極體21位於同-水平面上’並且其光入射面^係與發光二極體 ^之發光面210相互面對，藉此可以接受來自於發光二極體21之光 線。在其他實補巾，若電路板22之寬度較大，導級W還可以進 -步***板22之下方，以防止漏光並錢—步提高結構的穩定 性。而光學薄膜4G顺於導光板1G的光出射面13的上方。 框架50和光學薄媒4〇之上方定義出一空腔％，液晶顯示面板8〇 200848870 即容置於空腔58内。如第6圖所示，液晶顯示面板80位於框架5〇之 定位邊56之内側，以及導光板10和光學薄膜4〇的上方。而電路板22 則位於定位邊56之外侧，以及發光二極體21的上方。由於在一實施 例中，導光板10和發光二極體21可位於同一水平面上，而光學薄膜 4〇的厚度非常的小(第5圖與第6圖中的光學薄膜40厚度僅為示意， 而非其實際厚度)，因此，液晶顯示面板80底部和電路板22之下表面(即 承載發光二極體21之表面)之間的相對垂直距離可非常短，幾乎可以看 做是位於同一水平面上。換言之，本發明之液晶顯示器1〇〇可藉由邊 框51的高度和定位邊56的尺寸調整，將液晶顯示面板8〇和電路板^ 可女置在同一個鬲度，並且可以依照液晶顯示面板的厚度來選擇電 路板22的厚度尺寸，從而液晶顯示面板80和電路板22位於同一高度 的空間内，克服了習知技術中液晶顯示面板和承載發光二極體的電路 板分別處於不同的水平面而造成整體厚度較大的問題，降低了液晶顯 示器100之整體厚度。 本發明之較佳實施例之液晶顯示器100另包含有一金屬件60，其 呈縱長狀，且剖面結構呈半開口型，金屬件60係包覆於框架50之安 裝有發光二極體陣列光源20之邊框51上，藉以固定電路板22。金屬 件60具有一水平窄邊61、一水平寬邊62及一連接水平窄邊61與水平 寬邊62的豎直邊63，其中水平窄邊61具有一接觸面61〇，係貼靠於 電路板22之上表面(即與承載發光二極體Ή之面相反的另一表面），以 將發光二極體21散發的熱量導出，以利於散熱；水平寬邊62係貼靠 200848870 於框架50之-邊框51的底部，—固定螺絲7〇依次穿過水平寬邊Q 上的通孔620 (見第3圖）及位於框架50之輿邊框51連接的另一邊框 52上的螺孔520，藉此將金屬件6〇安裝於框架5〇上，並可進一步增 加背光模組1之結構穩定性。 請同時參照第1圖所示之習知液晶顯示器9⑻，及由第6圖所示之 本發明-實施例的液晶顯示器⑽。從圖中可以明顯得知，習知液晶顯 不器900之厚度主要包括有電路板93之厚度、導光板9〇之厚度、液 晶顯示面板92之厚度，以及反射片94與複數光學_95之厚度；本 發明液晶顯示器100之厚度主要包括有導光板1〇之厚度、液晶顯示面 板80之厚度，以及反射片3〇與複數光學薄膜4〇之厚度。此外，比較 第1圖和第6圖，本發明一實施例的液晶顯示器1〇〇，電路板22的上 表面(即與承載發光二極體21之面相反的另一表面)至液晶顯示面板8〇 的外表面之_垂直距離，小於電路板22厚度和液晶顯示面板8〇厚 度之和。因此，本發明中電路板21不需要單獨佔據一定厚度的空間， 從而降低了液晶顯示器100之厚度。 綜上所述，本發明確已符合發明專利之要件，麦依法提出專利申 請。惟，以上所述者·本發明之較佳實施方式，舉凡熟習本案技術 之人士援依本發明之精神所作之等效修飾或變化，皆涵蓋於後附之申 明專利範圍内。另外本發明的任一實施例或申請專利範圍不須達成 本發明所揭露之全部目的或優點或特點。此外，摘要部分和標題 僅是用來_專散件搜尋⑺，並非聽限制本翻之權利範 12 200848870 圍。 【圖式簡單說明】 第1圖係制金屬基電路板之習知背光模減構示意圖。 第2圖係本發明—實施例的背光模組之結構分解示意圖。 第3圖係第2 _中所示之本發％ —實施例f光模組之部分結構放大示 思圖。 第4圖係第2目中所示之本發明一實施例背光模、组之發光二極體陣列 光源之結構示意圖。 第5圖係第2圖中所示之本發明-實施例背光模、組之剖面結構示意圖。 6圖係本發明液晶顯示ϋ之剖面結構示意圖。 【主要元件符號說明】 背光模組 1 液晶顯示器 100 導光板 10，90 光入射面 11 下表面 12 光出射面 13 發光二極體陣列光源 20 發光二極體 21，91 發光面 210 電路板 22，93 反射片 30，94 光學薄膜 40，95 框架 50 邊樞 5 卜 52、 53、54 螺孔 520 底壁 55 定位邊 56 間隙 57 13 200848870 空腔 58 金屬件 60 水平窄邊 61 接觸面 610 水平寬邊 62 通孔 620 豎直邊 63 固定螺絲 70 液晶顯示面板 80，92 14The frame 5 is used to carry all of the above components. In the present embodiment, the frame % is a plastic frame having four frames 5, 52, 53 and 54 and - for example, a hollow bottom wall %. For other implementations, the bottom wall 55 does not need to be hollowed out. In contrast to the conventional technique, the above-mentioned LED array 20 is printed on the circuit board 22, and the above-mentioned financial system is mounted on the frame 5 of the frame 5 (see Figure 5). In the figure and Fig. 3, the frame 51_ is provided with a positioning edge %, which is formed in a horizontal direction and a vertical direction with respect to the frame 51, so that the positioning edge 56 and the frame 51 are formed between the positioning edge 56 and the frame 51. The circuit board 22 of the non-emitting one-pole array light source 2 is located on the outer side of the positioning side brother and the space above the frame 51, and the light-emitting diode 21 of the light-emitting diode array light source 2 is located on the positioning side 56 and the frame. The light-emitting diode 21 in the present embodiment is a side-emitting type light-emitting diode, so that the light emitted from the light-emitting diode 21 can be emitted from the gap 57. The reflection sheet 30 is attached and mounted. On the bottom wall 55 of the frame 5G, and the end of the reflection sheet 30 is inserted in a reserved position below the light-emitting diode 21. The light guide plate 10 is horizontally inserted below the positioning edge 56 (see Fig. 5). For positioning, and on the same-horizontal plane with the illuminant-pole 21 and its light incident surface The light-emitting surfaces 210 of the photodiodes face each other, thereby receiving light from the light-emitting diodes 21. In other solid wipes, if the width of the circuit board 22 is large, the guides W can be inserted further. The lower side of the plate 22 prevents light leakage and increases the stability of the structure. The optical film 4G is above the light exit surface 13 of the light guide plate 1G. A cavity % is defined above the frame 50 and the optical thin film 4 The liquid crystal display panel 8〇200848870 is accommodated in the cavity 58. As shown in Fig. 6, the liquid crystal display panel 80 is located inside the positioning edge 56 of the frame 5〇, and above the light guide plate 10 and the optical film 4〇. The circuit board 22 is located on the outer side of the positioning edge 56 and above the light emitting diode 21. Since in one embodiment, the light guide plate 10 and the light emitting diode 21 can be located on the same horizontal surface, and the thickness of the optical film 4〇 Very small (the thickness of the optical film 40 in Figures 5 and 6 is only illustrative, not its actual thickness), therefore, the bottom of the liquid crystal display panel 80 and the lower surface of the circuit board 22 (i.e., carrying the light-emitting diode 21) The relative vertical distance between the surfaces) Often short, it can be seen as being on the same level. In other words, the liquid crystal display 1 of the present invention can be adjusted by the height of the bezel 51 and the size of the positioning edge 56, and the liquid crystal display panel 8 and the circuit board can be female. The same thickness is set, and the thickness of the circuit board 22 can be selected according to the thickness of the liquid crystal display panel, so that the liquid crystal display panel 80 and the circuit board 22 are located in the same height space, overcoming the liquid crystal display panel of the prior art and The circuit board carrying the light-emitting diodes is in different horizontal planes, causing a large overall thickness, which reduces the overall thickness of the liquid crystal display 100. The liquid crystal display 100 of the preferred embodiment of the present invention further includes a metal member 60. The metal member 60 is wrapped around the frame 51 of the frame 50 on which the light-emitting diode array light source 20 is mounted, thereby fixing the circuit board 22. The metal member 60 has a horizontal narrow side 61, a horizontal wide side 62 and a vertical side 63 connecting the horizontal narrow side 61 and the horizontal wide side 62. The horizontal narrow side 61 has a contact surface 61〇 which is attached to the circuit. The upper surface of the board 22 (ie, the other surface opposite to the surface carrying the LEDs) is used to derive the heat radiated from the LEDs 21 to facilitate heat dissipation; the horizontal wide side 62 is attached to the frame 50 - the bottom of the frame 51, the fixing screw 7 turns through the through hole 620 on the horizontal wide side Q (see Fig. 3) and the screw hole 520 on the other frame 52 connected to the frame 51 of the frame 50, Thereby, the metal member 6〇 is mounted on the frame 5〇, and the structural stability of the backlight module 1 can be further increased. Please refer to the conventional liquid crystal display 9 (8) shown in Fig. 1 and the liquid crystal display (10) of the present invention-embodiment shown in Fig. 6. As is apparent from the figure, the thickness of the conventional liquid crystal display 900 mainly includes the thickness of the circuit board 93, the thickness of the light guide plate 9, the thickness of the liquid crystal display panel 92, and the reflection sheet 94 and the complex optical _95. The thickness of the liquid crystal display device 100 of the present invention mainly includes the thickness of the light guide plate 1 , the thickness of the liquid crystal display panel 80 , and the thickness of the reflective sheet 3 〇 and the plurality of optical films 4 . In addition, comparing the first and sixth figures, in the liquid crystal display device of one embodiment of the present invention, the upper surface of the circuit board 22 (ie, the other surface opposite to the surface carrying the light-emitting diode 21) is applied to the liquid crystal display panel. The vertical distance of the outer surface of the 8 turns is smaller than the sum of the thickness of the circuit board 22 and the thickness of the liquid crystal display panel 8. Therefore, the circuit board 21 of the present invention does not need to occupy a space of a certain thickness alone, thereby reducing the thickness of the liquid crystal display 100. In summary, the present invention has indeed met the requirements of the invention patent, and Mai filed a patent application according to law. However, the above-described preferred embodiments of the present invention are intended to be within the scope of the appended claims. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract section and the title are only used for _ special parts search (7), not the right to limit the scope of the right to turn 12 200848870. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional backlight mode reduction structure of a metal-based circuit board. Fig. 2 is a schematic exploded view showing the backlight module of the present invention. Fig. 3 is an enlarged view showing a part of the configuration of the optical module shown in the second embodiment. Fig. 4 is a view showing the structure of a light-emitting diode array light source of a backlight mode and a group according to an embodiment of the present invention shown in the second item. Fig. 5 is a schematic cross-sectional view showing the backlight mode and the group of the present invention shown in Fig. 2; 6 is a schematic cross-sectional view of a liquid crystal display of the present invention. [Main component symbol description] Backlight module 1 Liquid crystal display 100 Light guide plate 10, 90 Light incident surface 11 Lower surface 12 Light exit surface 13 Light-emitting diode array light source 20 Light-emitting diode 21, 91 Light-emitting surface 210 Circuit board 22, 93 Reflector 30,94 Optical film 40,95 Frame 50 Side pivot 5 Bu 52, 53, 54 Screw hole 520 Bottom wall 55 Positioning edge 56 Clearance 57 13 200848870 Cavity 58 Metal fitting 60 Horizontal narrow side 61 Contact surface 610 Horizontal width Side 62 through hole 620 vertical side 63 fixing screw 70 liquid crystal display panel 80, 92 14