200923489 1 25578twf.doc/p 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種液晶顯示器及其背光模組，且特 別是有關於一種具有良好顯示品質的液晶顯示器及具有^ 好光學品質的背光模組。 义 【先前技術】 圖1為習知一種背光模組的示意圖，而圖2為導光板 〇 對應背板之折彎部的網點油墨脫落的示意圖。請同時參考 圖1及圖2，因為背光模組100之背板11〇的折彎部 相對於背板110的其他地方而言為局部高點，因此為背板 Π0之局部壓應力較大的區塊，如圖丨之A區。如此—來， 當背光模組100在組裝或運送過程中，導光板12〇難免合 與折彎部112發生碰撞，此時容易造成導光板12()對應1 區之處的網點油墨剝落而掉至反射片上。導光板12〇之網 點油墨剝落的現象又在尚溫或高濕的情況下更為嚴重。當 ¥光板120對應折彎冑112處的網點油墨脫落後，合$響 U 背光模組100點亮時的光學品質。簡單而言，背光模 對應A區處為-暗區。 值得-提岐，在燈罩13G的切斷面132處，也容易 會有毛邊或局部較线的情形。燈罩m的毛邊及局部 銳的地方，也會造成上述之導光板12〇的網點油墨剝落二 ^外，在背光模組1〇㈣震動或是機械衝擊測試的時 候’燈罩130的中間容易變形而向内彎曲’導致 ⑽内的光學膜材15〇(如稜制、增光片或擴散片=到 200923489 ru /u^z^i , W 25578twf.doc/p 燈罩130播麗而幫曲。更甚者，還有可能因為燈罩—中 間向内憂形彎曲而使燈管（未標示）因震動或機械衝擊測試 後導致導光板12〇撞斷燈管的情況。另外，當背光模組1〇〇 點亮時’因為光學膜材15〇的彎曲，使得背光模組漏的 輝度表現不均勻，而有如水紋狀的亮、暗區分佈(丽㈣）。 【發明内容】 本發明提供一種具有良好光學品質的背光模組。 Ο 本發明提供一種具有良好顯示品質的液晶顯示器。 一此本發明提出—種背光模組，包括—導光板、一光源、 -背板以及-緩衝層。光源設置於導光板之—側。背板用 以承載導光板及-燈罩，其中燈罩容置光源並包含延伸部 及切斷面，而切斷面介於導光板與背板之間。緩衝層配置 於導光板與延伸部之間，並鄰近切斷面。 在本發明之一實施例中，上述之背板的材質包括金屬。 在本發明之一實施例中，上述之燈罩的材質包括金屬。 在本發明之一實施例中，其中燈罩之延伸部具有一凹 ο 陷鄰近該切斷面。 在本發明之一實施例中，上述之背板具有開口，而凹 陷之延伸部位於開口。或者，背板更具有折彎部，且折彎 部對應於延伸部之凹陷之下。 在本發明之一實施例中，上述之光源為冷陰極螢光 燈、有機電激發光二極體或電激發光二極體。 在本發明之一實施例中，上述之緩衝層的材質包括海 棉(sponge )。 在本發明之一實施例中，上述之緩衝層之形狀包括方 200923489 -----------W 25578twf.doc/p 形、圓形、橢圓形或三角形。 本發明另提出一種液晶顯示器’其包括一液晶顯示面 板以及一上述之背光模組，其中液晶顯示面板配置於該背 光模組之一'侧。 在本發明之一實施例中，上述之液晶顯示器更包括— 配置於液晶顯示面板與背光模組之間的光學膜片。 在本發明之一實施例中，上述之光學膜片包括稜鏡 片、增光片或擴散片。 本發明又提出一種背光模組，其包括一導光板、一光 源以及一背板。光源設置於導光板之一側。背板用以承载 導光板及一燈罩，其中燈罩容置光源並包含一延伸部延伸 於，光板與背板之間。其中，更包含—對應於導光板下之 固定結構以使背板與延伸部之位置相對固定。200923489 1 25578twf.doc/p IX. Description of the Invention: [Technical Field] The present invention relates to a liquid crystal display and a backlight module thereof, and particularly to a liquid crystal display having good display quality and having a good Optical quality backlight module. [Previous Art] FIG. 1 is a schematic view of a conventional backlight module, and FIG. 2 is a schematic view of the dot ink drop of the light guide plate 对应 corresponding to the bent portion of the back plate. Please refer to FIG. 1 and FIG. 2 at the same time, because the bent portion of the back plate 11 of the backlight module 100 is a local high point with respect to other places of the back plate 110, so that the partial compressive stress of the back plate Π0 is large. Block, as shown in Area A. In this way, when the backlight module 100 is assembled or transported, the light guide plate 12 is inevitably collided with the bent portion 112. At this time, the dot ink corresponding to the region 1 of the light guide plate 12 is easily peeled off. On the reflective sheet. The phenomenon of ink peeling at the dot of the light guide plate 12 is more serious in the case of temperature or high humidity. When the ink screen 120 corresponds to the dot ink at the folding edge 112, the optical quality of the backlight module 100 is illuminated. In simple terms, the backlight mode corresponds to a dark region in the A zone. It is worthwhile to mention that at the cut surface 132 of the lamp cover 13G, it is easy to have a burr or a partial line. The burrs of the lampshade m and the sharp parts of the lamp cover m also cause the ink dots of the light guide plate 12 剥 to be peeled off. When the backlight module 1 (4) vibrates or mechanically impacts the test, the middle of the lampshade 130 is easily deformed. Bending inward 'causes the optical film 15〇 in (10) (such as ribs, dimming sheets or diffusers = to 200923489 ru /u^z^i, W 25578twf.doc/p lampshade 130 solo and help. Even more It is also possible that the light guide tube (not shown) causes the light guide plate 12 to collide with the light tube due to vibration or mechanical impact test due to the bending of the lamp cover in the middle direction. In addition, when the backlight module 1 is defective When it is bright, 'the brightness of the leakage of the backlight module is uneven due to the bending of the optical film 15〇, and the light and dark areas are distributed like water-like (Li (4)). [Invention] The present invention provides a good optical The invention provides a liquid crystal display with good display quality. The invention provides a backlight module, which comprises a light guide plate, a light source, a back plate and a buffer layer. The side of the light board. The backboard is configured to carry a light guide plate and a lamp cover, wherein the lamp cover houses the light source and includes an extending portion and a cut surface, and the cut surface is between the light guide plate and the back plate. The buffer layer is disposed between the light guide plate and the extension portion. In an embodiment of the invention, the material of the back plate comprises metal. In an embodiment of the invention, the material of the lamp cover comprises metal. In an embodiment of the invention The extension of the lamp cover has a recessed portion adjacent to the cut surface. In an embodiment of the invention, the back plate has an opening, and the extension of the recess is located at the opening. Alternatively, the back plate has a bent portion. And the bent portion corresponds to the recess of the extending portion. In an embodiment of the invention, the light source is a cold cathode fluorescent lamp, an organic electroluminescent diode or an electroluminescent diode. In one embodiment, the material of the buffer layer comprises a sponge. In an embodiment of the invention, the shape of the buffer layer comprises a square 200923489 -----------W 25578twf. Doc/p, round, oval or triangle The present invention further provides a liquid crystal display comprising a liquid crystal display panel and a backlight module as described above, wherein the liquid crystal display panel is disposed on one side of the backlight module. In an embodiment of the present invention, the above The liquid crystal display further includes an optical film disposed between the liquid crystal display panel and the backlight module. In an embodiment of the invention, the optical film comprises a cymbal, a brightness enhancement or a diffusion sheet. The backlight module includes a light guide plate, a light source and a back plate. The light source is disposed on one side of the light guide plate. The back plate is configured to carry the light guide plate and a lamp cover, wherein the lamp cover houses the light source and includes an extension portion extending from the Between the light plate and the back plate, further comprising - corresponding to the fixed structure under the light guide plate to relatively fix the position of the back plate and the extension portion.
U 在本發明之一實施例中’上述之背板之材質包括金屬。 在本發明之一實施例中，上述之燈罩之材質包 在本發明之-實施例中，上述之固定結構包含具有屬一 固定部之延伸部以及位於背板上相對 在本發明之一實施例中，上述之固定結二 固疋部之延伸部以及位於背板上相對於固定部之開口，而 使固定部位於開口。 =本發明之一實施例中，上述之光源為冷陰極螢光 燈、有機電激發光二極體或電激發光二極體。 棉。在本她-⑽W咖增包括海 200923489 …•〜一一…J 25578twf.doc/p 在本發明之一實施例中’上述之緩衝層之形狀包括方 形、圓形、橢圓形或三角形。 本發明另提出-種液晶顯示器，其包括—液晶顯示面 板以及一上述之背光模組，其中液晶顯示面板配置於該背 光模組之一側。 在本發明之一實施例中’上述之液晶顯示器更包括一 配置於液晶顯示面板與背光模組之間的光學膜片。 f、 在本發明之—實施例巾’上述之光學膜片包括稜鏡 片、增光片或擴散片。 在本發明之背光模組及使用此背光模組的液晶顯示器 中，藉由位於反射片以及燈罩之間的緩衝層，可以避免導 光板之網點油墨脫落。此外，利用與緩衝層相對應之背板 與燈罩之設計，可改善背光模組於震動或機械衝擊測試 後，因燈罩向内彎曲變形而導致的膜材彎曲問題，進而增 進背光模組的光學品質以及液晶顯示器的顯示品質。a 為讓本發明之上述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，作詳細說明如下。 【實施方式】 [第一實施例] 圖3為本發明第一實施例之液晶顯示器的示意圖，而 $ 4為圖3之背光模組的局部構件立體示意圖。請同時參 、圖3及圖4’液晶顯示器2000包括—液晶顯示面板21〇〇 二，酉己置於液晶顯示面板2100之-側的背光模組 220〇。背光模組2200包括一背板221〇、一燈罩222〇、一 200923489 W 25578twf.doc/p 光源2230、一導光板2240、一反射片2250以及一緩衝層 2260。燈罩2220配置於背板2210上，而光源223〇配置在 燈罩2220内，其中背板2210及燈罩2220的材質為金屬、 或疋由金屬與反射片互相結合或貼合而成，且光源2230 可為冷陰極螢光燈、有機電激發光二極體或電激發光二極 體。為了使为光模組2200的整體重量較輕，—般背板2210 及燈罩2220的材質可使用铭。或者，背板221〇及燈罩2220 的材質也可以使用耐高溫、強度較強的塑膠，並在背板 2210及燈罩2220的表面鐘上具反射率的金屬或高分子材 料。 燈罩2220具有一延伸部2222，而導光板2240配置於 背板2210内，且部份的導光板224〇承靠於延伸部2222。 反射片2250配置在燈罩2220及導光板2240之間，且反射 片2250也承靠於延伸部2222上。缓衝層2260配置於延伸 部2222上，並位於反射片2250以及燈罩2220之間，其中 延伸部2222具有一切斷面2222a，且切斷面2222a介於導 光板2240與背板2210之間。缓衝層2260配置於2240導 光板與延伸部2222之間’並鄰近切斷面2222a。在本實施 例中，緩衝層2260的材質為具有彈性的海綿。 藉由缓衝層2260的配置，當背光模組2200於組裝或 是運送的過程中’可以緩衝導光板2240與燈罩2220或背 板2210之間的震動或撞擊，避免應力直接藉由反射片225〇 傳至導光板2240下側的油墨網點上而造成油墨網點的轉 印。如此’便可以進而改善習知於組裝或搬運的過程中， 200923489 i \j I t· W 25578twf.doc/p 導光板與背板或鮮碰撞時，因為局部縣力大，而使得 導光板的網點油墨會剝落的情形。因此，本實施例之導光 板2240的油墨網點得以完整保存，背光模組22〇〇便能夠 具有良好㈣學品質。而使用本實施例之#紐組22〇〇 的液晶顯示器2000便會具有良好的顯示品質。 承上述’本實施例之緩衝層226〇可以是利用貼附或是 塗佈的方式以形成於延伸部2222上，且緩衝層2260的厚 度約為0.1〜0.2厘米(mm)。為了不同的目的，緩衝層226〇 的形狀可以選擇性地改變。如圖4所示，緩衝層226〇為長 條狀，且其為一整條地配置在延伸部2222鄰近切斷面 2222a處。在另一未繪示的實施例中，緩衝層226〇的形狀 也可以是長方形，且緩衝層可以是適當間隔地配置在延伸 部2222鄰近切斷面2222a處。本技術領域具通常知識者， 能夠可想而知地依照實際需求來改變緩衝層的形狀及分佈 位置。此外，雖然圖3所示之位於燈罩222〇下方的延伸部 2222較位於燈罩2220上方的延伸部2224突出許多，但在 不違反本發明精神下，本技術領域具通常知識者也能夠可 想而知地調整燈罩2220上、下方的延伸部2224、2222的 相對長度。 此外，為了提升液晶顯示器2000的顯示品質，因此在 液晶顯示面板2100與背光模組2200之間還會配置一光學 膜片2300，此光學膜片2300可以是增光片、棱鏡片、擴 散片或其組合。 [第二實施例] 200923489 i \j I i. »V 25578twf.doc/p 本實施例與第一實施例大致相同，且圖示及說明書中 相同或相似的元件標號代表相同或相似的元件。相同之處 於本實施例中不再贅述，以下僅說明本實施例與第一實施 例不同之處。 圖5為本發明第二實施例之背光模組的示意圖，而圖 6為圖5之背光模組的局部構件立體示意圖。請同時參考 圖5及圖6 ’本實施例之燈罩3220具有一延伸部3222，其 中延伸部3222並具有一凹陷，以使延伸部3222朝向反射 片2250的表面3222b與反射片2250之間有一空隙。 詳細地來說’凹陷於的延伸部3222是利用鈑件抽引的 方式來形成，其中延伸部3222的設置方式可以是一整條式 的凹陷，或是以其他形狀的凹陷間隔排列，並將緩衝層 3260配置在延伸部3222。其中，凹陷的形狀可以是相同或 是不同。或者，也可以是利用折彎燈罩322〇本體的邊緣處 來形成較低陷的延伸部3222。延伸部3222的形狀、分佈 位置及間隔距離，依照實際需求來決定，而緩衝層326〇 的形狀、分佈位置及間隔距離’可以與延伸部3222相對應。 於本實施例中，延伸部3222具有一凹陷，而使得延伸 部3222的表面3222b與反射片2250之間有一空隙。為了 使反射片2250得到良好的支撐，因此緩衝層326〇的厚度 較第一實施例之緩衝層226〇的厚度為厚，此厚度較佳為略 大於:¾專於表面3222b至反射片2250的距離。由於緩衝層 3260厚度較厚，其可壓縮性較佳，因此緩衝效果也較佳。 相對應地，背板3210對應延伸部3222處也會有一折 11 200923489 W 25578twf.doc/p 彎部3212，以使凹陷的延伸部3222會與折彎部3212對應 重里。此折彎部3212可為背板3210原本就有的抽引部， 因此是使延伸部3222對應背板3210原有的抽引部設置。 或者，折膏部3212也可以是特別為了延伸部3222而另外 對應設置的。 值付注,¾的是’猎由延伸部3222與折彎部3212重疊， 因此折彎部3212會對延伸部3222具有拘束作用。當背光 模組3200經過震動或機械沖擊的測試之後，燈罩322〇有 可能會變形而朝向導光板2240内凹。藉由折彎部3212對 延伸部3222的拘束’可以避免燈罩3220向内彎曲變形且 移位’而與光學膜材2300相互干涉，因此不會有如習知之 背光模組水紋狀的亮、暗區分佈(waving)的情形。所以， 本實施例之背光模組3200具有良好的光學品質，進而使使 用本貫施例之背光模組3200的液晶顯示器具有良好的顯 示品質。 [第三實施例] 本實施例與第二實施例大致相同’且圖示及說明書中 相同或相似的元件標號代表相同或相似的元件。相同之處 於本實施例中不再贅述，以下僅說明本實施例與第二實施 例不同之處。 圖7為本發明第三實施例之背光模組的示意圖，而圖 8為圖7之背光模組局部構件立體示意圖。請同時參考圖7 及圖8，本實施例與第二實施例不同之處在於：本實施例 之背板4210於相對應凹陷之延伸部3222處為—開口 12 200923489 ------------w 25578twf.doc/p 4212。 與弟二實施例之为板3210的折彎部3212效果相同， 由於延伸部3222配置在開口 4212内，開口 4212可以拘束 延伸部3222。因此，可以避免背光模組42〇〇震動或機械 沖擊的測試之後’因為燈罩3220向内彎曲變形且移位，並 與光學膜材2300相互干涉而造成的背光模組水紋狀的 亮、暗區分佈(waving)的情形。所以，本實施例之背光模 、 組4200具有良好的光學品質，進而使使用本實施例之背光 模組4200的液晶顯示器具有良好的顯示品質。 [第四實施例] 本實施例與第一實施例大致相同，且圖示及說明書中 相同或相似的元件標號代表相同或相似的元件。相同之處 於本實施例中不再贅述，以下僅說明本實施例與第一實施 例不同之處。 圖9為本發明第四實施例之背光模組的示意圖。請參 考圖9’本實施例之背光模組5200包括一導光板2240、一 'J 光源2230以及一背板5210。光源2230設置於導光板2240 之一侧。背板5210用以承載導光板2240及燈罩3220，其 中燈罩3220各置光源2230並包气—延伸部3222延伸於導 光板2240與背板5210之間，而背板5210包含一形狀與延 伸部3222對應配合的固定結構5212。 詳細地來說’由於延伸部3222是由燈罩3220折彎， 因此固定結構5212的形狀與延伸部5212對應配合，其可 為一凹陷。藉由延伸部3222與固定結構5212的重疊配置， 13 200923489 * ^ W 25578twf.doc/p 固定結構5212會對延伸部3222具有拘束作用。 當背光模組5200經過震動或機械沖擊的測試之後’可 以避免燈罩3220移位。此外，由於延伸部3222是由燈罩 3220折彎的’因此若背光模組5200經過震動或機械沖擊 的測試之後’燈罩3220發生向内彎曲變形，也會因為延伸 部3222與導光板2240之間存有一緩衝空間，因此可以避 免燈罩3220撞擊導光板2240而使得導光板2240上的印刷 油墨網點脫落或轉印的情形發生，可進而讓應用本實施例 之背光模組5200的液晶顯示器具有良好的顯示品質。 雖然本實施例之固定結構5212的形狀是一與延伸部 5212對應配合的凹陷，但本技術領域具通常知識者也能夠 可想而知地將此固定結構5212設計為開口或是其他的形 狀’只要讓固定結構5212的形狀能夠與延伸部3222對應 配合即可。 综上所述，本發明背光模組及使用此背光模組的液晶 顯示器’藉由在反射片及燈罩之間設置緩衝層，而至少具 有下列之優點： 一、 利用緩衝層來緩衝撞擊力’避免背板或燈罩對導 光板的碰撞應力藉由反射片傳遞至導光板下側的 油墨網點而使油墨網點轉印，因此可以保護導光 板的油墨網點的完整性，使背光模組維持其良好 的光學品質’進而讓使用此背光模組的液晶顯示 器具有良好的顯示品質。 二、 使燈罩的延伸部具有一凹陷，並且在背板相對應、 14 200923489 W 25578twf.doc/p 延伸部的地方設置凹陷的折彎部或開口，以使折 彎部或開口拘束延伸部。如此，可改善背光模組 在經過震動或機械衝擊測試後，燈罩因内陷變形 而與光學膜材干涉所形成的水紋狀的亮、暗區分 佈(waving)的情形。因此’本發明之背光模組具 有良好的光學品質’進而讓使用此背光模組的液 晶顯示器具有良好的顯示品質。 〇 二、藉由延伸部以及固定結構的設置，還可防止因震 動或機械衝擊測試後，燈罩中間向内變形彎曲而 導致導光板撞斷燈管的情況。 ^雖然本發明已以較佳實施例揭露如上，然其並非用以 發明，任何所屬技術領域中具有通常知識者，在不 發明之精神和範_，當可作些許之更動與潤飾， 為準。^明之保遵範圍當視後附之申請專利範圍所界定者 【圖式簡單說明】 G 圖1為習知—種背光模組的示意圖。 意圖圖2為導光板對應背板之折彎部的網點油墨脫落的示 2本發明第-實施例之液晶顯示器的示意圖。 二:圖3之月光模組的局部構件立體示意圖。 發明第二實施例之背光模組的示意圖。 =^圖5之背光模組的局部構件立體示意圖。 為本發明第三實施例之背光模組的示音、圖。 15 200923489 W 25578twf.doc/p 圖8為圖7之背光模組局部構件立體示意圖。 圖9為本發明第四實施例之背光模組的示意圖。 【主要元件符號說明】 100、2200、3200、4200、5200 :背光模組 110、2210、3210、4210、5210 :背板 112 :折彎部 120、2240 :導光板 130、2220、3220 :燈罩 132、2222a :切斷面 140、2250 :反射片 150 :光學膜材 2000 ·液晶顯不益 2100 .液晶顯不面板 2222、3222 :延伸部 2230 :光源 2260、3260 :缓衝層 2300 :光學膜片 3212 :折彎部 3222b :表面 4212 :開口 5212 :固定結構 A .暗區 16U In an embodiment of the invention, the material of the back sheet described above comprises a metal. In an embodiment of the present invention, the material of the lamp cover is encapsulated in the embodiment of the present invention, wherein the fixing structure comprises an extension having a fixing portion and is located on the back plate, and is an embodiment of the present invention. The extension portion of the fixed junction and the fixing portion and the opening on the back plate relative to the fixing portion are located at the opening. In one embodiment of the invention, the light source is a cold cathode fluorescent lamp, an organic electroluminescent diode or an electroluminescent diode. cotton. In the present invention, the shape of the buffer layer described above includes a square shape, a circular shape, an elliptical shape or a triangular shape. In one embodiment of the invention, the shape of the buffer layer described above includes a square shape, a circular shape, an elliptical shape or a triangular shape. The present invention further provides a liquid crystal display comprising a liquid crystal display panel and a backlight module as described above, wherein the liquid crystal display panel is disposed on one side of the backlight module. In an embodiment of the invention, the liquid crystal display further includes an optical film disposed between the liquid crystal display panel and the backlight module. f. In the present invention - the optical film described above comprises a gusset, a brightness enhancement sheet or a diffusion sheet. In the backlight module of the present invention and the liquid crystal display using the same, the dot ink of the light guide plate can be prevented from falling off by the buffer layer between the reflection sheet and the lamp cover. In addition, the design of the back plate and the lamp cover corresponding to the buffer layer can improve the bending problem of the film caused by the inward bending deformation of the lamp cover after the vibration or mechanical impact test of the backlight module, thereby enhancing the optical of the backlight module. Quality and display quality of LCD monitors. The above described features and advantages of the present invention will become more apparent from the following detailed description. [First Embodiment] Fig. 3 is a schematic view showing a liquid crystal display according to a first embodiment of the present invention, and $4 is a perspective view showing a partial member of the backlight module of Fig. 3. Please refer to FIG. 3 and FIG. 4'. The liquid crystal display 2000 includes a liquid crystal display panel 21, which is disposed on the side of the liquid crystal display panel 2100. The backlight module 2200 includes a back plate 221, a lamp cover 222, a 200923489 W 25578 twf.doc/p light source 2230, a light guide plate 2240, a reflection sheet 2250, and a buffer layer 2260. The light cover 2220 is disposed on the back plate 2210, and the light source 223 is disposed in the lamp cover 2220. The back plate 2210 and the lamp cover 2220 are made of metal or are combined with metal or reflective sheets, and the light source 2230 can be It is a cold cathode fluorescent lamp, an organic electroluminescent diode or an electroluminescent diode. In order to make the overall weight of the optical module 2200 lighter, the materials of the back panel 2210 and the lampshade 2220 can be used. Alternatively, the material of the back plate 221 and the lamp cover 2220 may be made of a plastic having high temperature resistance and high strength, and a metal or polymer material having reflectivity on the surface clocks of the back plate 2210 and the lamp cover 2220. The lamp cover 2220 has an extension portion 2222, and the light guide plate 2240 is disposed in the back plate 2210, and a portion of the light guide plate 224 is supported by the extension portion 2222. The reflection sheet 2250 is disposed between the lamp cover 2220 and the light guide plate 2240, and the reflection sheet 2250 is also supported by the extension portion 2222. The buffer layer 2260 is disposed on the extending portion 2222 and located between the reflective sheet 2250 and the lamp cover 2220. The extending portion 2222 has a cross section 2222a, and the cut surface 2222a is interposed between the light guide plate 2240 and the back plate 2210. The buffer layer 2260 is disposed between the 2240 light guide plate and the extending portion 2222 and adjacent to the cut surface 2222a. In the present embodiment, the material of the buffer layer 2260 is a sponge having elasticity. By the configuration of the buffer layer 2260, when the backlight module 2200 is assembled or transported, the vibration or impact between the light guide plate 2240 and the lamp cover 2220 or the back plate 2210 can be buffered, and the stress is directly prevented by the reflection sheet 225. The ink is transferred to the ink dot on the lower side of the light guide plate 2240 to cause transfer of the ink dot. So, you can improve the conventional assembly or handling process. 200923489 i \j I t· W 25578twf.doc/p When the light guide plate and the back plate collide with each other, the light guide plate is made because of the local county force. The dot ink will peel off. Therefore, the ink dots of the light guide plate 2240 of the present embodiment can be completely preserved, and the backlight module 22 can have good (four) quality. The liquid crystal display 2000 using the #纽组22〇〇 of the present embodiment has good display quality. The buffer layer 226 of the above embodiment may be formed by attaching or coating on the extending portion 2222, and the buffer layer 2260 has a thickness of about 0.1 to 0.2 cm. The shape of the buffer layer 226A can be selectively changed for different purposes. As shown in Fig. 4, the buffer layer 226 is elongated and disposed in one piece at the extension 2222 adjacent to the cut surface 2222a. In another embodiment not shown, the shape of the buffer layer 226A may also be a rectangle, and the buffer layer may be disposed at an appropriate interval between the extension portion 2222 adjacent to the cut surface 2222a. Those skilled in the art will be able to imaginatively change the shape and distribution of the buffer layer in accordance with actual needs. In addition, although the extension 2222 located below the shade 222 is more prominent than the extension 2224 located above the shade 2220, it will be apparent to those skilled in the art without departing from the spirit of the present invention. The relative lengths of the extensions 2224, 2222 above and below the shade 2220 are known to be adjusted. In addition, in order to improve the display quality of the liquid crystal display 2000, an optical film 2300 may be disposed between the liquid crystal display panel 2100 and the backlight module 2200, and the optical film 2300 may be a brightness enhancement sheet, a prism sheet, a diffusion sheet or combination. [Second Embodiment] 200923489 i \j I i. »V 25578twf.doc/p This embodiment is substantially the same as the first embodiment, and the same or similar component numbers in the drawings and the description represent the same or similar elements. The same points are not described in detail in the embodiment, and only the differences between the embodiment and the first embodiment will be described below. FIG. 5 is a schematic diagram of a backlight module according to a second embodiment of the present invention, and FIG. 6 is a perspective view showing a partial component of the backlight module of FIG. Referring to FIG. 5 and FIG. 6 simultaneously, the lamp cover 3220 of the present embodiment has an extending portion 3222, wherein the extending portion 3222 has a recess so that the extending portion 3222 faces the surface between the surface 3222b of the reflective sheet 2250 and the reflective sheet 2250. . In detail, the recessed portion 3222 is formed by means of a drawing, wherein the extending portion 3222 can be arranged in a whole-type depression or arranged in a recessed manner of other shapes, and The buffer layer 3260 is disposed at the extension portion 3222. Among them, the shapes of the depressions may be the same or different. Alternatively, the lower recessed portion 3222 may be formed by the edge of the body of the bent lamp cover 322. The shape, the distribution position, and the separation distance of the extending portion 3222 are determined according to actual needs, and the shape, distribution position, and spacing distance ' of the buffer layer 326'' may correspond to the extending portion 3222. In the present embodiment, the extending portion 3222 has a recess such that there is a gap between the surface 3222b of the extending portion 3222 and the reflective sheet 2250. In order to provide good support for the reflective sheet 2250, the thickness of the buffer layer 326 is thicker than the thickness of the buffer layer 226A of the first embodiment, and the thickness is preferably slightly larger than: 3⁄4 for the surface 3222b to the reflective sheet 2250. distance. Since the buffer layer 3260 is thicker, its compressibility is better, and therefore the buffering effect is also better. Correspondingly, the back plate 3210 also has a fold portion 3212 corresponding to the extending portion 3222 so that the extended portion 3222 of the recess corresponds to the bent portion 3212. The bent portion 3212 can be the original portion of the back plate 3210. Therefore, the extending portion 3222 is disposed corresponding to the original drawing portion of the back plate 3210. Alternatively, the paste portion 3212 may be additionally provided correspondingly for the extension portion 3222. As a result, it is noted that the hunting portion 3222 overlaps with the bent portion 3212, so that the bent portion 3212 has a restraining effect on the extending portion 3222. After the backlight module 3200 is subjected to a vibration or mechanical impact test, the lamp cover 322 may be deformed to be concave toward the light guide plate 2240. The restraining of the extending portion 3222 by the bent portion 3212 can prevent the lamp cover 3220 from being bent and deformed inwardly and interfere with the optical film 2300, so that there is no light and dark like the conventional backlight module. The case of district waving. Therefore, the backlight module 3200 of the present embodiment has good optical quality, and thus the liquid crystal display using the backlight module 3200 of the present embodiment has good display quality. [THIRD EMBODIMENT] The present embodiment is substantially identical to the second embodiment' and the same or similar component numbers in the drawings and the description represent the same or similar elements. The same points will not be described in detail in the embodiment, and only the differences between the embodiment and the second embodiment will be described below. FIG. 7 is a schematic diagram of a backlight module according to a third embodiment of the present invention, and FIG. 8 is a perspective view showing a partial component of the backlight module of FIG. 7. Referring to FIG. 7 and FIG. 8 simultaneously, the difference between the embodiment and the second embodiment is that the back plate 4210 of the embodiment is an opening 1222 at the corresponding recessed portion 3222 - 200923489 ------- -----w 25578twf.doc/p 4212. The effect of the bent portion 3212 of the plate 3210 is the same as that of the second embodiment. Since the extending portion 3222 is disposed in the opening 4212, the opening 4212 can restrain the extending portion 3222. Therefore, it is possible to avoid the light and darkness of the backlight module caused by the backlight module 42 being subjected to the vibration or mechanical impact test after the lamp cover 3220 is bent and deformed inwardly and interferes with the optical film 2300. The case of district waving. Therefore, the backlight module and the group 4200 of the present embodiment have good optical quality, and the liquid crystal display using the backlight module 4200 of the embodiment has good display quality. [Fourth Embodiment] This embodiment is substantially the same as the first embodiment, and the same or similar reference numerals in the drawings and the description denote the same or similar elements. The same points are not described in detail in the embodiment, and only the differences between the embodiment and the first embodiment will be described below. FIG. 9 is a schematic diagram of a backlight module according to a fourth embodiment of the present invention. Referring to FIG. 9', the backlight module 5200 of the embodiment includes a light guide plate 2240, a 'J light source 2230, and a back plate 5210. The light source 2230 is disposed on one side of the light guide plate 2240. The back plate 5210 is configured to carry the light guide plate 2240 and the lamp cover 3220. The light cover 3220 is respectively disposed with the light source 2230 and the air entrapment portion 3222 extends between the light guide plate 2240 and the back plate 5210. The back plate 5210 includes a shape and an extension portion 3222. Corresponding to the fixed structure 5212. In detail, since the extension portion 3222 is bent by the lamp cover 3220, the shape of the fixing structure 5212 is matched with the extending portion 5212, which may be a recess. By the overlapping arrangement of the extension portion 3222 and the fixed structure 5212, the 13 200923489 * ^ W 25578twf.doc/p fixing structure 5212 has a restraining effect on the extension portion 3222. When the backlight module 5200 is subjected to a test of vibration or mechanical shock, the lamp cover 3220 can be prevented from being displaced. In addition, since the extension portion 3222 is bent by the lamp cover 3220, "if the backlight module 5200 undergoes a test of vibration or mechanical impact, the lamp cover 3220 undergoes inward bending deformation, and also exists between the extension portion 3222 and the light guide plate 2240. There is a buffer space, so that the lamp cover 3220 can be prevented from colliding with the light guide plate 2240, so that the printing ink dot on the light guide plate 2240 is detached or transferred, and the liquid crystal display of the backlight module 5200 of the embodiment can be displayed with good display. quality. Although the shape of the fixing structure 5212 of the present embodiment is a recess corresponding to the extending portion 5212, it is also conceivable for those skilled in the art to design the fixing structure 5212 as an opening or other shape. It suffices that the shape of the fixing structure 5212 can be matched with the extending portion 3222. In summary, the backlight module of the present invention and the liquid crystal display using the backlight module have at least the following advantages by providing a buffer layer between the reflective sheet and the lamp cover: 1. Using a buffer layer to buffer the impact force. The impact stress of the back plate or the lamp cover on the light guide plate is prevented from being transferred to the ink dot on the lower side of the light guide plate by the reflective sheet to transfer the ink dot, thereby protecting the integrity of the ink dot of the light guide plate and maintaining the backlight module in good condition. The optical quality' further enables the liquid crystal display using this backlight module to have good display quality. 2. The extension of the lampshade has a recess, and a recessed bend or opening is provided in the corresponding portion of the backplane, such that the bend or opening constrains the extension. In this way, it is possible to improve the water-like bright and dark wavy condition of the backlight module formed by the interference of the optical film with the optical film after the vibration or mechanical impact test. Therefore, the backlight module of the present invention has good optical quality, and the liquid crystal display using the backlight module has good display quality. 〇 Second, with the extension and the fixed structure, it is also possible to prevent the light guide from colliding and bending in the middle of the lampshade after the vibration or mechanical impact test, causing the light guide plate to break the lamp. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to be exhaustive, and it is not intended to be limited by the scope of the invention. The scope of the application is defined by the scope of the patent application attached to the following [Simplified illustration] G Figure 1 is a schematic diagram of a conventional backlight module. 2 is a schematic view of a liquid crystal display according to a first embodiment of the present invention, in which the light guide plate is separated from the dot ink of the bent portion of the back plate. Two: A three-dimensional schematic diagram of the partial components of the moonlight module of Figure 3. A schematic diagram of a backlight module of the second embodiment of the invention. = ^ Figure 3 is a perspective view of the partial components of the backlight module. A sound and a diagram of a backlight module according to a third embodiment of the present invention. 15 200923489 W 25578twf.doc/p Figure 8 is a perspective view of the partial components of the backlight module of Figure 7. FIG. 9 is a schematic diagram of a backlight module according to a fourth embodiment of the present invention. [Main component symbol description] 100, 2200, 3200, 4200, 5200: backlight module 110, 2210, 3210, 4210, 5210: back plate 112: bent portion 120, 2240: light guide plate 130, 2220, 3220: lamp cover 132 2222a: cut surface 140, 2250: reflective sheet 150: optical film 2000) liquid crystal display 2100. liquid crystal display panel 2222, 3222: extension 2230: light source 2260, 3260: buffer layer 2300: optical film 3212: bent portion 3222b: surface 4212: opening 5212: fixed structure A. dark area 16