201037412 六、發明說明： 【發明所屬之技術領域】 本發明關於一種顯示裝置，特別關於一種顯示裝置及 其製造方法。 【先前技術】 平面顯示裝置以其體型輕薄的優點，已經被使用於各 式各樣的電子產品中，並且逐漸地取代傳統的陰極射線管201037412 VI. Description of the Invention: [Technical Field] The present invention relates to a display device, and more particularly to a display device and a method of fabricating the same. [Prior Art] The flat display device has been used in a wide variety of electronic products due to its slimness and has gradually replaced the conventional cathode ray tube.
顯示裝置（Cathode Ray Tube DiSpiay Apparatus, CRTDisplay device (Cathode Ray Tube DiSpiay Apparatus, CRT
Display Apparatus)。平面顯示裝置具有一背光模組以提供 光源，而對液晶顯示裝置而言，背光模組又具有直下式背 光模組及側光式背光模組兩種類別。當然，背光模組亦可 應用於照明設備。 如圖1A所示’一種習知應用於液晶顯示裝置的背光 模組1包含複數光學膜片11〜13、一膠帶15、一導光板 16、一反射片R、一框體Π及一光源18。背光模組1是 以側光式背光模組為例。光學膜片11〜13可包含擴散膜 片、增亮膜片及保護膜片等，並可用以提升光線的光學性 質。光學膜片11〜13彼此相疊設置，並設置於導光板16 的一表面，並各具有一結合部111、121、131。膠帶15用 以固定光學膜片11〜13。反射片R設置於導光板16的另 一表面’並用以反射光線。光學膜片11〜13、導光板16 及反射片R皆容置於框體17内。光源18鄰設於導光板16 之一側邊，用以發出光線。 201037412 圖1B為圖1A中A-A線段的剖面圖，顯示膠帶15如 何固定光學膜片11〜13。如圖1B所示，膠帶15黏合光學 膜片13的結合部131。 由於液晶顯示裝置於出廠前，需先通過震動測試，然 而在背光模組1中，膠帶15僅固定光學膜片13,而其他 的光學膜片11、12皆是未固定的狀態，因此於震動測試 時，光學膜片11〜13之間會互相滑動、摩擦，造成光學 膜片11〜13刮傷，進而降低液晶顯示裝置的良率。另外， 〇 若增加膠帶15的數量來固定光學膜片11〜13，會增加成 本並提高組裝的複雜性。 因此，如何提供一種顯示裝置，能夠利用一連結元件 使所有光學膜片彼此相對固定，進而提升良率及可靠度， 實為當前重課題之一。 【發明内容】 ^ 有鑑於上述課題，本發明之目的為提供一種能夠利用 一連結元件使所有光學膜片彼此相對固定的顯示裝置。 為達上述目的，依本發明之一種顯示裝置包含一顯示 面板以及一背光模組，背光模組和顯示面板組合。背光模 組包含一第一光學膜片、一第二光學膜片以及一連結元 件。第一光學膜片具有一第一結合部。第二光學膜片與第 • 一光學膜片相疊設置，並具有一第二結合部。連結元件連 • 結第一結合部與第二結合部，使該等光學膜片彼此相對固 201037412 為達上述目的，依據本發明之一種顯示裝置的製造方 法，包含以下步驟：將一第一光學膜片與一第二光學膜片 相疊設置，第一光學膜片具有一第一結合部，第二光學膜 片具有一第二結合部；以及藉由一連結元件連結該等結合 部，使該等光學膜片彼此相對固定。 為達上述目的，依本發明之一種顯示裝置包含一顯示 面板以及一背光模組。背光模組和顯示面板組合。背光模 組包含二片光學膜片、一結合部以及一連結元件。該等光 學膜片彼此相疊設置，各光學膜片具有一結合部，且該等 結合部相疊設置並形成一階梯結構。連結元件連結階梯結 構，使該等光學膜片彼此相對固定。 為達上述目的，依據本發明之一種顯示裝置的製造方 法包含以下步驟：將二片光學膜片相疊設置，各光學膜片 具有一結合部，且該等結合部相疊設置並形成一階梯結 構；以及藉由一連結元件連結階梯結構，使該等光學膜片 彼此相對固定。 為達上述目的，依本發明之一種顯示裝置包含一顯示 面板以及一背光模組。背光模組和顯示面板組合。背光模 組包含一第一光學膜片、一第二光學膜片以及一連結元 件。第一光學膜片具有一第一結合部。第二光學膜片與第 一光學膜片相疊設置，並具有一第二結合部與第一結合部 相疊設置。連結元件具有一倒勾部，連結元件連結第一結 合部及第二結合部，使第一光學膜片及第二光學膜片彼此 相對固定，並且倒勾部延伸連結於第二結合部相對於第一 201037412 結合部的另一侧。 ，承上所述’依本發明之顯示裝置之背光模組藉由各光 :膜片之結合部及/或連結元件具有不同的設置（例如結合 4乂錯设置或呈階梯結構、或是連結元件具有倒勾部）， 使知本發明只需利用一連結元件即可連結各結合部，使得 ，學膜片彼此相對固定，並避免其相對滑動、摩擦，進而 提升良率及可靠度，並降低成本。 Ο 【實施方式】 以下將參照相關圖式，說明依本發明較佳實施例之顯 不聚置及其製造方法，其中相同的元件將以相同的參照符 號加以說明。 第一實施例 —如圖2A顯示本發明第一實施例之顯示裝置包含一顯 不面板PL及一背光模組2。背光模組2與顯示面板ρΕ組 〇 5，並可包含複數光學臈片21〜24、一連結元件25、一 導光板26、一反射片R、—框體27及一光源28。在本實 知例中’背光模組2是以側光式背光模組並應用於液晶顯 示裝置為例；當然，背光模組2亦可為直下式背光模組或 疋其他態樣的背光模組，並可應用於其他電子裝置，例如 照明裴置。 光學膜片21〜24可選自增亮膜片、擴散膜片、偏光 膜片及保護膜片等，用以提升光線的光學性質。光學膜片 21〜24彼此相疊設置，並各具有—結合部211、221、231、 7 201037412 24卜連結元件25用以連結結合部211、221、231、24卜 光學膜片21〜24設置於導光板26的一表面，反射片R設 置於導光板26的另一表面，用以反射光線。光學膜片21 〜24、導光板26及反射片R皆容置於框體27内，本實施 例之框體為一膠框。光源28鄰設於導光板26之一側邊， 用以發出光線。 圖2B為光學膜片21〜24 (僅顯示光學膜片24)、連 結元件25及框體27的局部示意圖，圖2C為圖2B中B-B 線段的剖面圖。請參照圖2B及圖2C所示，本實施例中， 結合部211、221、231、241兩兩相疊設置，且連結元件 25的兩端分別延伸至相疊的結合部之間。在本實施例中， 結合部211、221、231、241為突出部，連結元件25可為 一雙面膠帶或一黏膠。藉由連結元件25連結結合部211、 221、231、241，使光學膜片21〜24能夠彼此相對固定。 本實施例的框體27具有對應光學膜片21〜24之結合 部211、221、231、241的結構。例如，框體27具有一定 位結構271 (圖2C)，結合部211、221、231、241位於定 位結構271的兩側，定位結構271的優點在於，讓結合部 21卜221、23卜241維持它該有的高度，以避免懸空的現 象產生，而影響背光模組2的結構性。定位結構271大致 與光學膜片21或22的厚度相等。另外，請參照圖2D及 圖2E，其中圖2D為圖2E之背光模組沿B-B線段的剖面 示意圖，框體27可更具有定位結構272、273，定位結構 272的高度約等於定位結構271的高度與光學膜片22的厚 201037412 度的總和，以及定位結構273的高度約等於光學膜片21 的厚度，故連結元件25的二端自兩側相疊的結合部再延 伸至定位結構272、273，使光學膜片能與框體27固定。 另外，框體27亦可具有複數個定位結構P (圖2B)，以定 位光學膜片21〜24。 本實施例是以一連結元件25黏結四片光學膜片21〜 24為例，當然，連結元件25亦可黏結更多或較少的光學 膜片。舉例而言，若連結元件25黏結三片光學膜片，即 〇 本實施例省略光學膜片24(或23);此時，兩結合部211、 231相疊設置或部份相疊設置，另一結合部221獨立設置 或與結合部211、231兩者之一部分相疊，且連結元件25 的一端延伸至相疊的結合部211、231之間，連結元件25 的另一端連結另一結合部221。另外，若連結元件25連結 五片光學膜片，即連結元件25自其一端再延伸倒勾以連 結第五片光學膜片。 q 請參照圖3所示，本發明第一實施例之顯示裝置的製 造方法包括步驟S21至步驟S23。步驟S21將二片光學膜 片21、23相疊設置，各光學膜片2卜23具有一結合部211、 231。步驟S22藉由一連結元件25連結該等結合部211、 231，使該等光學膜片21、23彼此相對固定。步驟S23將 再二光學膜片22、24相對於該等光學膜片21、23相疊設 . 置，光學膜片22、24各具有一結合部221、241，使該等 四結合部211、221、231、241兩兩相疊設置或部份相疊 設置，且連結元件的兩端分別延伸至相疊的結合部之間。 201037412 另外，顯示裝置之製造方法可更包含將光學膜片21〜24 設置於框體27 ;再將背光模組2與顯示面板PL組合。由 於顯示裝置的製造方法已一併詳述於上，故不再贅述。 第二實施例 請參照圖4A及圖4B所示，以說明本發明第二實施例 之顯示裝置之背光模組3。其中，圖4A為背光模組3的局 部示意圖，圖4B為圖4A中C-C線段的剖面圖。背光模 組3包含三片光學膜片31〜33以及一連結元件35。光學 膜片31〜33可選自增亮膜片、擴散膜片、偏光膜片及保 護膜片，用以提升光線的光學性質。光學膜片31〜33彼 此相疊設置，並各具有一結合部311、321、331。連結元 件35用以連結結合部311、321、331。 背光模組3更包含一框體37,光學膜片31〜33設置 於框體37内。當然，背光模組3更可包含一導光板36、 一反射片R及光源（圖未顯示）等元件，這些元件的設置 位置及其功能皆可參照第一實施例，此外，由於本實施例 的技術重點並未包含這些元件，故於此不再細述這些元 件。 本實施例的技術重點在於，光學膜片31〜33的結合 部311、321、331相疊設置並形成一階梯結構L，而連結 元件35連結階梯結構L及框體37，使光學膜片31〜33 彼此相對固定。在本實施例中，連結元件35可為一膠帶 或一黏膠。此外，本實施例是以三片光學膜片31〜33為 例作說明，當然連結元件35亦可連結更多或較少的光學 201037412 膜片。 本實施例中，階梯結構L具有複數梯面L1〜L3，且 梯面L1〜L3的面積彼此相異，若是由上而下（即自L3至 L1的方向），梯面L3、L2、L1的面積是依序遞增，藉由 連結面積的遞增能夠加強連結強度。在本實施例中，各結 合部311、321、331自各光學膜片31、32、33的同一侧 向外延伸以形成階梯結構L，且階梯結構L平行於該側。 另外，如圖5所示為階梯結構L’垂直於該側的態樣，在這 〇 種情況下，結合部31Γ、32Γ、33Γ的面積是依序遞減（當 然，結合部331'、32Γ、31Γ的面積則是依序遞增），以形 成階梯結構L’。另外，框體37、37'亦可具有複數個如圖 2B所示之定位結構P以定位光學膜片31〜33。 如圖4A所示，在本實施例中，框體37具有對應光學 膜片31〜33之結合部311、321、331的結構。例如，框 體37具有一凹槽371容置結合部311、321、331。 q 請參照圖6所示，本發明第二實施例之顯示裝置的製 造方法包括步驟S31及步驟S32。步驟S31將至少二片光 學膜片31〜33相疊設置，各光學膜片31〜33具有一結合 部311、321、331，且結合部311、321、331相疊設置並 形成一階梯結構L;以及步驟S32藉由一連結元件35連結 階梯結構L，使光學膜片31〜33彼此相對固定。由於本實 - 施例之顯示裝置的製造方法已一併詳述於上，故於此不再 贅述。 第三實施例 11 201037412 請參照圖7A及圖7B所示，以說明本發明第三實施例 之顯示裝置之背光模組4。其中，圖7A為背光模組4的局 部示意圖，圖7B為圖7A中D-D線段的剖面圖。背光模 組4包含一第一光學膜片41、一第二光學膜片42、一第 三光學膜片43以及一連結元件45。光學膜片41〜43可選 自增亮膜片、擴散膜片、偏光膜片及保護膜片，用以提升 光線的光學性質。光學膜片41〜43彼此相疊設置，並各 具有一第一結合部411、一第二結合部421及一第三結合 部431。連結元件45用以連結結合部411、421、431。 背光模組4更包含一框體47，光學膜片41〜43設置 於框體47内。當然，背光模組4更可包含一導光板46、 一反射片R及光源（圖未顯示）等元件，這些元件的設置 位置及其功能皆可參照第一實施例，此外，由於本實施例 的技術重點並未包含這些元件，故於此不再細述這些元 件。 本實施例的技術重點在於，第一結合部411與第二結 合部421相疊設置，第二結合部421與第三結合部431相 疊設置，連結元件45 —端延伸至第一結合部411及第二 結合部421之間，使第一光學膜片41及第二光學膜片42 彼此相對固定，並且連結元件45另一端具有一倒勾部Η， 倒勾部Η延伸至第二結合部421相對於第一結合部411的 另一側，在本實施例中即為第二結合部421與第三結合部 431之間，使第二光學膜片42及第三光學膜片43彼此相 對固定。在本實施例中，連結元件45可為一雙面膠帶或 12 201037412 一黏膠。另外，如圖7C顯示另一態樣之框體，框體47更 具有定位結構471，倒勾部Η延伸至定位結構，定位結構 471的高度大致與光學膜片41或42的厚度相等，故連結 元件45可自光學膜片的結合部延伸至定位結構471，致使 光學膜片能與框體47固定。另外，框體47亦可具有複數 個如圖2Β所示之定位結構Ρ，以定位光學膜片41〜43。 圖8顯示本實施例之另一態樣。連結元件45'更具有 一轉折部Β，轉折部Β與倒勾部Η'連結，且轉折部Β連結 〇 於第三光學膜片的第三結合部43Γ。 綜上所述，依本發明之顯示裝置之背光模組藉由各光 學膜片之結合部及/或連結元件具有不同的設置（例如結合 部交錯設置或呈階梯結構、或是連結元件具有倒勾部）， 使得本發明只需利用一連結元件即可連結各結合部，使得 光學膜片彼此相對固定，並避免其相對滑動、摩擦，進而 提升良率及可靠度，並降低成本。 ^ 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1Α為一種習知背光模組的示意圖； ' 圖1Β為圖1Α中Α-Α線段的剖面圖； 圖2A為本發明第一實施例之一種顯示裝置的示意圖； 13 201037412 圖2 B為本發明第一實施例之背光模組的局部示 圖2C為圖2β中B_B線段的剖面圖； θ 圖2D及圖2Ε為第—實施例之背光模組的另 不意圖； 圖3為本發明第一實施例之顯示裝置 流程圖； 態樣的 之製造方法 的 圖4Α為本發明第二實施例之—種顯示裝 組的局部示意圖； 月尤模 圖4Β為圖4Α中C-C線段的剖面圖； •圖5為第二實施例之背光模組之另—態樣的局部示意 圖； 流程=為本發明第二實施例之顯示裝置之製造方法 =Μ為本發㈣三實施例之—軸 組的局部示意圖； 不月尤横 圖7Β為圖7AtD_D線段的剖面圖； 圖7C為本發明第三實施例 示意圖；以及 I 之月先杈組的另一態樣的 的 圖 圖8為第三實施例之背光模組之另 態樣的剖面示意 【主要元件符號說明】 2 ' 3 ' 3’ ' 4、4’ ：背光模組 11 〜1 q、〇 ί 光學膜片 1 〜24、31 〜33、311 〜33f · 14 201037412 111 、 121 、 131 、 211 、 221 、 231 、 241 、 311 、 321 、 331 、 31Γ、32Γ、33Γ :結合部 15 :膠帶 16、 26、36、46 :導光板 17、 27、37、37'、47 :框體 18、 28 :光源 25、35、45、45':連結元件 271、272、273、471、P :定位結構 〇 371 :凹槽 41 :第一光學膜片 411、41Γ :第一結合部 42 :第二光學膜片 421、42Γ :第二結合部 43 :第三光學膜片 431、43Γ :第三結合部 ❹ B .轉折部 Η、H，：倒勾部 L、L·':階梯結構 L1〜L3 :梯面 PL :顯示面板 R :反射片 • S21〜S23、S31〜S32 :顯示裝置之製造方法的步驟 15Display Apparatus). The flat display device has a backlight module to provide a light source, and for the liquid crystal display device, the backlight module has two types: a direct type backlight module and an edge light type backlight module. Of course, the backlight module can also be applied to lighting equipment. As shown in FIG. 1A, a conventional backlight module 1 for a liquid crystal display device includes a plurality of optical films 11 to 13, a tape 15, a light guide plate 16, a reflection sheet R, a frame body, and a light source 18. . The backlight module 1 is exemplified by an edge-lit backlight module. The optical films 11 to 13 may include a diffusion film, a brightness enhancement film, a protective film, etc., and may be used to enhance the optical properties of light. The optical films 11 to 13 are disposed one on another, and are disposed on one surface of the light guide plate 16, and each has a joint portion 111, 121, 131. The tape 15 is used to fix the optical films 11 to 13. The reflection sheet R is disposed on the other surface ' of the light guide plate 16 and serves to reflect light. The optical films 11 to 13 , the light guide plate 16 and the reflection sheet R are housed in the frame 17 . The light source 18 is disposed adjacent to one side of the light guide plate 16 for emitting light. 201037412 Figure 1B is a cross-sectional view taken along line A-A of Figure 1A showing how the tape 15 holds the optical films 11-13. As shown in Fig. 1B, the tape 15 is bonded to the joint portion 131 of the optical film 13. Since the liquid crystal display device needs to pass the vibration test before leaving the factory, in the backlight module 1, the tape 15 only fixes the optical film 13, and the other optical films 11, 12 are in an unfixed state, so the vibration is During the test, the optical films 11 to 13 slide and rub each other, causing the optical films 11 to 13 to be scratched, thereby lowering the yield of the liquid crystal display device. Further, if the number of the tapes 15 is increased to fix the optical films 11 to 13, the cost is increased and the assembly complexity is improved. Therefore, how to provide a display device capable of fixing all optical films to each other by a connecting member, thereby improving yield and reliability, is one of the current major problems. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a display device in which all of the optical films can be fixed to each other by a connecting member. To achieve the above object, a display device according to the present invention comprises a display panel and a backlight module, a backlight module and a display panel combination. The backlight module includes a first optical film, a second optical film, and a connecting member. The first optical film has a first joint. The second optical film is disposed to overlap the first optical film and has a second joint. The connecting element is connected to the first bonding portion and the second bonding portion, so that the optical films are fixed to each other. 201037412. In order to achieve the above object, a manufacturing method of a display device according to the present invention comprises the following steps: The film is disposed on the second optical film, the first optical film has a first bonding portion, the second optical film has a second bonding portion, and the bonding portion is coupled by a connecting member. The optical films are fixed relative to each other. To achieve the above object, a display device according to the present invention comprises a display panel and a backlight module. A combination of a backlight module and a display panel. The backlight module includes two optical films, a joint, and a connecting member. The optical films are disposed one on another, each optical film having a joint portion, and the joint portions are stacked one on another and form a stepped structure. The joining elements are coupled to the stepped structure such that the optical films are fixed relative to each other. In order to achieve the above object, a method of manufacturing a display device according to the present invention comprises the steps of: arranging two optical films stacked one on another, each optical film having a joint portion, and the joint portions are stacked and formed into a ladder And a structure in which the optical films are fixed to each other by a connecting member. To achieve the above object, a display device according to the present invention comprises a display panel and a backlight module. A combination of a backlight module and a display panel. The backlight module includes a first optical film, a second optical film, and a connecting member. The first optical film has a first joint. The second optical film is disposed on the first optical film and has a second joint disposed on the first joint. The connecting element has a barb portion, the connecting element connecting the first joint portion and the second joint portion, so that the first optical film and the second optical film are fixed to each other, and the hook portion is extended and coupled to the second joint portion with respect to First 201037412 The other side of the joint. According to the above description, the backlight module of the display device according to the present invention has different settings by the respective light: the joint portion and/or the connecting member of the film (for example, a combination of 4 faults or a stepped structure, or a link) The component has an undercut portion, so that the invention can connect the joints with only one connecting element, so that the diaphragms are fixed relative to each other, and the relative sliding and friction are avoided, thereby improving the yield and reliability, and cut costs. [Embodiment] Hereinafter, a display and a method of manufacturing the same according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals. First Embodiment - As shown in Fig. 2A, a display device according to a first embodiment of the present invention includes a display panel PL and a backlight module 2. The backlight module 2 and the display panel Ε5 , 5 may include a plurality of optical cymbals 21 to 24, a connecting member 25, a light guide plate 26, a reflective sheet R, a frame 27 and a light source 28. In the present embodiment, the backlight module 2 is an edge-lit backlight module and is applied to a liquid crystal display device. Of course, the backlight module 2 can also be a direct-lit backlight module or a backlight module of other aspects. Group, and can be applied to other electronic devices, such as lighting devices. The optical films 21 to 24 may be selected from the group consisting of a brightness enhancement film, a diffusion film, a polarizing film, and a protective film to enhance the optical properties of light. The optical films 21 to 24 are disposed one on another, and each has a bonding portion 211, 221, 231, and 7 201037412. The bonding member 25 is used to connect the bonding portions 211, 221, 231, and 24 to the optical films 21 to 24. On one surface of the light guide plate 26, a reflection sheet R is disposed on the other surface of the light guide plate 26 for reflecting light. The optical films 21 to 24, the light guide plate 26 and the reflection sheet R are housed in the frame 27, and the frame of the embodiment is a plastic frame. The light source 28 is disposed adjacent to one side of the light guide plate 26 for emitting light. Fig. 2B is a partial schematic view showing the optical films 21 to 24 (only the optical film 24 is shown), the connecting member 25, and the frame 27, and Fig. 2C is a cross-sectional view taken along line B-B of Fig. 2B. Referring to FIG. 2B and FIG. 2C, in the embodiment, the joint portions 211, 221, 231, and 241 are disposed one on another, and both ends of the joint member 25 are respectively extended between the overlapping joint portions. In this embodiment, the joint portions 211, 221, 231, and 241 are protrusions, and the joint member 25 may be a double-sided tape or a glue. The bonding portions 211, 221, 231, and 241 are coupled by the connecting member 25, so that the optical films 21 to 24 can be fixed to each other. The frame body 27 of the present embodiment has a structure corresponding to the joint portions 211, 221, 231, and 241 of the optical films 21 to 24. For example, the frame body 27 has a positioning structure 271 (FIG. 2C), and the joint portions 211, 221, 231, and 241 are located on both sides of the positioning structure 271. The positioning structure 271 has an advantage in that the joint portion 21, 221, 23, and 241 are maintained. It should have a height to avoid the phenomenon of floating, and affect the structure of the backlight module 2. The positioning structure 271 is substantially equal to the thickness of the optical film 21 or 22. 2D and 2E, wherein FIG. 2D is a cross-sectional view of the backlight module of FIG. 2E along the BB line segment, and the frame 27 may further have positioning structures 272 and 273. The height of the positioning structure 272 is approximately equal to the positioning structure 271. The sum of the height and the thickness of the optical film 22 is 201037412 degrees, and the height of the positioning structure 273 is approximately equal to the thickness of the optical film 21, so that the two ends of the connecting member 25 are extended from the overlapping portions of the two sides to the positioning structure 272, 273, the optical film can be fixed to the frame 27. Alternatively, the frame 27 may have a plurality of positioning structures P (Fig. 2B) for positioning the optical films 21 to 24. In this embodiment, four optical films 21 to 24 are bonded by a connecting member 25. Of course, the connecting member 25 can also bond more or less optical films. For example, if the connecting member 25 bonds three optical films, the optical film 24 (or 23) is omitted in this embodiment; at this time, the two bonding portions 211, 231 are stacked or partially stacked, and another A joint portion 221 is disposed independently or partially overlaps with one of the joint portions 211, 231, and one end of the joint member 25 extends between the overlapping joint portions 211, 231, and the other end of the joint member 25 is coupled to the other joint portion. 221. Further, if the connecting member 25 is coupled to five optical films, that is, the connecting member 25 is extended from its one end to the hook to join the fifth optical film. Referring to Fig. 3, a method of manufacturing the display device according to the first embodiment of the present invention includes steps S21 to S23. In step S21, the two optical films 21, 23 are stacked one on another, and each of the optical films 2, 23 has a joint portion 211, 231. In step S22, the bonding portions 211 and 231 are coupled by a connecting member 25 to fix the optical films 21 and 23 to each other. Step S23, the second optical film 22, 24 is stacked on the optical film 21, 23, and each of the optical films 22, 24 has a joint portion 221, 241, so that the four joint portions 211, 221, 231, 241 are arranged one above another or partially overlapping, and the two ends of the connecting element respectively extend between the overlapping joints. 201037412 In addition, the manufacturing method of the display device may further include disposing the optical films 21 to 24 on the housing 27, and combining the backlight module 2 with the display panel PL. Since the manufacturing method of the display device has been described in detail above, it will not be described again. Second Embodiment Referring to Figures 4A and 4B, a backlight module 3 of a display device according to a second embodiment of the present invention will be described. 4A is a partial schematic view of the backlight module 3, and FIG. 4B is a cross-sectional view taken along line C-C of FIG. 4A. The backlight module 3 includes three optical films 31 to 33 and a connecting member 35. The optical films 31 to 33 may be selected from the group consisting of a brightness enhancement film, a diffusion film, a polarizing film, and a protective film to enhance the optical properties of light. The optical films 31 to 33 are disposed one on another and each has a joint portion 311, 321, 331. The connecting member 35 is for connecting the joint portions 311, 321, and 331. The backlight module 3 further includes a frame 37, and the optical films 31 to 33 are disposed in the frame 37. The backlight module 3 may further include a light guide plate 36, a reflective sheet R, and a light source (not shown). The positions and functions of the components may be referred to the first embodiment. The technical focus does not include these components, so these components will not be described in detail herein. The technical point of this embodiment is that the bonding portions 311, 321, and 331 of the optical films 31 to 33 are stacked and formed with a stepped structure L, and the connecting member 35 is coupled to the stepped structure L and the frame 37 to make the optical film 31. ~33 are fixed relative to each other. In this embodiment, the joining member 35 can be a tape or a glue. In addition, this embodiment is described by taking three optical films 31 to 33 as an example. Of course, the connecting member 35 can also connect more or less optical 201037412 diaphragms. In this embodiment, the step structure L has a plurality of ladder faces L1 L L3, and the areas of the ladder faces L1 L L3 are different from each other, and if they are from top to bottom (ie, from L3 to L1), the facets L3, L2, L1 The area is increased in order, and the strength of the joint can be enhanced by increasing the joint area. In the present embodiment, each of the joint portions 311, 321, 331 extends outward from the same side of each of the optical films 31, 32, 33 to form a stepped structure L, and the stepped structure L is parallel to the side. In addition, as shown in FIG. 5, the step structure L' is perpendicular to the side, and in this case, the areas of the joint portions 31, 32, 33, are sequentially decreased (of course, the joint portions 331', 32", The area of 31 是 is sequentially increased to form a step structure L'. Further, the frame body 37, 37' may have a plurality of positioning structures P as shown in Fig. 2B to position the optical films 31 to 33. As shown in Fig. 4A, in the present embodiment, the frame body 37 has a structure corresponding to the joint portions 311, 321, and 331 of the optical films 31 to 33. For example, the frame 37 has a recess 371 for receiving the joints 311, 321, 331. Referring to Fig. 6, a method of manufacturing a display device according to a second embodiment of the present invention includes steps S31 and S32. In step S31, at least two optical films 31 to 33 are arranged one on another, each of the optical films 31 to 33 has a joint portion 311, 321, 331, and the joint portions 311, 321, and 331 are arranged one on another and form a step structure L. And step S32 connects the step structure L by a connecting member 35 to fix the optical films 31 to 33 to each other. Since the manufacturing method of the display device of the present embodiment has been described in detail above, it will not be described again. Third Embodiment 11 201037412 Referring to Figs. 7A and 7B, a backlight module 4 of a display device according to a third embodiment of the present invention will be described. 7A is a partial schematic view of the backlight module 4, and FIG. 7B is a cross-sectional view taken along line D-D of FIG. 7A. The backlight module 4 includes a first optical film 41, a second optical film 42, a third optical film 43, and a connecting member 45. The optical films 41 to 43 are optional from self-brightening films, diffusion films, polarizing films and protective films to enhance the optical properties of light. The optical films 41 to 43 are disposed one on another, and each has a first joint portion 411, a second joint portion 421, and a third joint portion 431. The connecting member 45 is for connecting the joint portions 411, 421, and 431. The backlight module 4 further includes a frame 47, and the optical films 41 to 43 are disposed in the frame 47. The backlight module 4 may further include a light guide plate 46, a reflective sheet R, and a light source (not shown). The positions and functions of the components may be referred to the first embodiment. The technical focus does not include these components, so these components will not be described in detail herein. The technical point of the embodiment is that the first joint portion 411 is disposed on the second joint portion 421, the second joint portion 421 is disposed on the third joint portion 431, and the joint member 45 extends to the first joint portion 411. Between the second bonding portion 421, the first optical film 41 and the second optical film 42 are fixed to each other, and the other end of the connecting member 45 has a barb portion Η, and the barb portion extends to the second bonding portion. 421 is opposite to the other side of the first joint portion 411, in this embodiment, between the second joint portion 421 and the third joint portion 431, so that the second optical film 42 and the third optical film 43 are opposed to each other. fixed. In this embodiment, the joining element 45 can be a double-sided tape or a 201037412 adhesive. In addition, as shown in FIG. 7C, the frame body 47 further has a positioning structure 471, and the barb portion extends to the positioning structure. The height of the positioning structure 471 is substantially equal to the thickness of the optical film 41 or 42. The joining element 45 can extend from the joint of the optical film to the positioning structure 471, such that the optical film can be secured to the frame 47. In addition, the frame body 47 may have a plurality of positioning structures 如图 as shown in FIG. 2A to position the optical films 41 to 43. Fig. 8 shows another aspect of the embodiment. The connecting member 45' further has a turning portion Β, the turning portion 连结 is coupled to the barb portion Η', and the turning portion Β is coupled to the third joint portion 43A of the third optical film. In summary, the backlight module of the display device according to the present invention has different arrangements by the joints and/or the connecting elements of the optical films (for example, the joint portions are staggered or arranged in a stepped manner, or the connecting members have a reversed configuration) The hook portion can be used to connect the joint portions by using only one connecting member, so that the optical films are fixed relative to each other, and the relative sliding and friction are avoided, thereby improving the yield and reliability, and reducing the cost. The above description is for illustrative purposes only and not as a limitation. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a schematic view of a conventional backlight module; FIG. 1A is a cross-sectional view of a Α-Α line segment of FIG. 1; FIG. 2A is a schematic view of a display device according to a first embodiment of the present invention; FIG. 2B is a partial cross-sectional view of the backlight module of the first embodiment of the present invention; FIG. 2C is a cross-sectional view of the B_B line segment of FIG. 2; FIG. 2D and FIG. 2B are further schematic views of the backlight module of the first embodiment; 3 is a flow chart of a display device according to a first embodiment of the present invention; FIG. 4A is a partial schematic view showing a display device according to a second embodiment of the present invention; FIG. 5 is a partial schematic view showing another embodiment of the backlight module of the second embodiment; Flow = manufacturing method of the display device according to the second embodiment of the present invention = Μ is the first (four) three implementation For example, a partial schematic view of a shaft set; a cross-sectional view of a cross-sectional view of FIG. 7 is a cross-sectional view of a line segment of FIG. 7; FIG. 7C is a schematic view of a third embodiment of the present invention; and FIG. 8 is another aspect of the backlight module of the third embodiment. Cross-sectional schematic [main component symbol description] 2 ' 3 ' 3' ' 4, 4': backlight module 11 ~ 1 q, 〇ί optical film 1 ~ 24, 31 ~ 33, 311 ~ 33f · 14 201037412 111, 121, 131, 211, 221, 231, 241, 311, 321 , 331 , 31 Γ, 32 Γ, 33 Γ : joint portion 15 : tapes 16, 26, 36, 46: light guide plates 17, 27, 37, 37', 47: Frames 18, 28: light sources 25, 35, 45, 45': coupling elements 271, 272, 273, 471, P: positioning structure 〇 371: grooves 41: first optical films 411, 41 Γ: first joint 42: second optical film 421, 42A: second joint portion 43: third optical film 431, 43A: third joint portion ❹ B. turning portion Η, H,: barb portion L, L·': step Structures L1 to L3: Ladder PL: Display panel R: Reflective sheet • S21 to S23, S31 to S32: Step 15 of the manufacturing method of the display device