M412377 五、新型說明： 【新型所屬之技術領域】 本創作係關於一種背光模組。 【先前技術】 背光模組（backlight module )係將點光源或線光源發 出的光線，通過光學結構的設計而成為一面光源的光學模 組。而背光模組的應用領域除了液晶顯示裝置之外，還能 作為發光鍵盤的背光源，以及廣告燈箱等等。隨著產品愈 來愈傾向㈣的趨勢，背光模組的輕薄㈣計，也逐漸成 為一個重要的議題。M412377 V. New description: [New technical field] This creation is about a backlight module. [Prior Art] A backlight module is a light module that emits light from a point source or a line source through the design of an optical structure. In addition to the liquid crystal display device, the application field of the backlight module can also serve as a backlight for the illuminated keyboard, as well as an advertising light box and the like. As products become more and more inclined to the trend of (4), the thin and light (4) backlight modules have gradually become an important issue.
以液晶顯示裝置的背光模組為例，依據不同光源設置 的位置，月光拉組可分為直下$ (directtype)卩及側光式 (edge light type)兩種。請參照圖i所示，一種習知的側 光式背光模組1係包含一導光板u、—發光單元12、一 稜鏡片（PriSmSheet)13' 二擴散月 Uiffusing sheet)14、 -反射片15及-雜16。具有發光二極體的發光單元 12，係設置於導光板u之—側邊，二擴散片14係設置於 導光板11之一出光面111，稜鏡片13係設置於二擴散片 Η之上’反射片15則鄰設於導光板u與出光面⑴相對 之-底面。其t，導光板„、稜鏡片13、擴散片Μ及反 射片15則皆以膠框16來固定。 當發光單元12所發出之光線射人導光板1〗後，大部 分光線會在導絲11之出光面⑴及底面之間產生全反 M412377 ---————---------—一 ^直到碰到設置於導光板u底面之_ .(圖未顯示;， 線會被散射而破壞了全反射，因而由導光板11之出光 二⑴射出導光板U。射”光板Π的光線經過稜鏡月 及擴散片Μ後，可得到良好的光學特性，進而提供一 句勻的面光源至一液晶顯示面板。 習知技術之背光模組〗膠框ί6來 ^他光_，還可防止光線由導光㈣的側面射出 至產生漏先現象。'然而’隨著背光模組1逐漸朝向輕薄 -向用射出成型製造出的膠框則變得命來 愈不易設計製造，而較薄_框16也容易在製造或: 過程t斷裂或損壞，導致f光模組丨的㈣良率下降。、 另一種習知技術解決漏光的方法，係將反射片15反 折以遮蔽導光板11之側面（圖中未顯示），或是於導光板 11之側面設置額外的反射片15 ’但是由於反射片15仍會 有部分光線穿透，故此方法的防漏光效果仍然不佳。曰 、因此、’如何提供一種背光模組，能夠防止導光板的側 邊漏光，進而提高光線的利用率，已成為重要課題之一。 【新型内容】 有鑑於上述課題，本創作之目的為提供—種背光模 組，以防止導光板的側邊漏光，*而提高光線的利用率。、 為達上述目的，依據本創作之一種背光模組包括一導 光板、至少一發光單元以及一可撓性膜材。發光單元設置 於導光板之一面。可撓性膜材之尺寸大於導光板之尺寸， M412377 可撓性膜材係包覆至少部分導光板，且可撓性膜材具有一 遮光部，遮光部係遮蔽導光板之至少一側面。 在一實施例中，發光單元設置於導光板之一面係為一 入光面。 在一實施例中，導光板更包含一出光面及與出光面相 對之一底面，側面係連結出光面與底面。 在一實施例中，可撓性膜材係包覆住導光板之出光面 及側面，且較佳地，可撓性膜材更包覆住部分底面。 在一實施例中，可撓性膜材具有複數開口對應於出光 面之複數微結構。 在一實施例中，可撓性膜材具有一透光部，透光部係 對應出光面。 在一實施例中，可撓性膜材係包覆住導光板之底面及 侧面，且較佳地，可撓性膜材更包覆住部分出光面。 在一實施例中，背光模組更包括一反射片，設置於導· 光板之底面，可撓性膜材至少部分包覆反射片。 在一實施例中，可撓性膜材係為一吸光膜材，遮光部 的面積實質上等於可撓性膜材的面積。較佳地，可撓性膜 材更具有一反射層，反射層位於可撓性膜材面對導光板之 一内表面。 在一實施例中，可撓性膜材係為一透光膜材，遮光部 係為一吸光層。較佳地，可撓性膜材更具有一反射層，反 射層與吸光層位於可撓性膜材的同一侧，且反射層較接近 導光板。較佳地，可撓性膜材更具有一反射層，反射層與 5 M412377 吸光層位於可撓性膜材的不同側，且反射層較接近導光 板。 在一實施例中，可撓性膜材係為一反光膜材，該遮光 部係為一吸光層。 在一實施例中，發光單元係包含一發光二極體、或一 螢光燈管或一雷射。 承上所述，依據本創作之背光模組，係利用可撓性膜 材包覆導光板之至少一侧面，並且藉由可撓性膜材之遮光 部來遮蔽光線，避免光線從導光板之侧面射出，以達到防 止背光模組侧面漏光之功效。與習知相較，可撓性膜材可 取代習知背光模組之膠框，有助於背光模組的薄型化，但 不會有膠框的缺點，進而能使背光模組的組裝良率得以提 升。此外，使用可撓性膜材之背光模組，其組裝方法簡便 且可隨不同的產品設計作對應的尺寸裁切，減少製造膠框 時的膜具費用，有助於製造成本的降低。 【實施方式】 以下將參照相關圖式，說明依本創作較佳實施例之一 種背光模組，其中相同的元件將以相同的參照符號加以說 明。 圖2A為本創作第一實施例之背光模組2的分解示意 圖，圖2B為本創作第一實施例之背光模組2的組合示意 圖。如圖2A及圖2B所示，背光模組2包括一導光板21、 一發光單元22及一可撓性膜材23。其中，背光模組2可 ;用：發光鍵盤、液晶顯示褒置或是廣告燈箱，於此，係 先以應用於發光鍵盤的背光模組2為例。 V光板21具有—出光面2ιι及與出光面相對之 底面2 1 2，而中伞~rr ^ 1 - 出先面2ll與底面2l2之間，則具有複數 側面213連結出光面9 ] 尤面211及底面212其中之一。其中，導 .&面212可具有複數印刷網點（圖未顯示），當 光板21後’藉由全反射而傳遞至整個導光板 二光線射至印刷網點時，則產生散射而破壞全反射， η由導光板21的出光面211射出。一般而言，導 ^匕^用的材貝為聚甲基丙烯酸甲s旨（ΡΜΜΑ)、聚石炭 酸酷（pc)、或聚苯乙稀（ps)。 电光早元22設置於暮杏此〇+ 照射進入導光招71止面，用以提供光線 ’ ，光線在導光板21中以全反射方式導 引傳遞。其十，發光單元22可例如但不限於包含至少一 =先二極體、或—螢光燈管或一雷射。於此，背光模組2 的背光模組2為例說明，而具有發光二極體之 X、’早70 22係位於導光板21之―側面。當然，當背光模 組2為直下式背光模組時，發光二極體則可鄰設於導光板 21的底面212，且由底面212入光。發光單元22除了可 =於導光板21之側面或底面212之外，在其他實施態 i發光單元42亦可如圖从所示埋設於導絲内， =早兀42係以於導光板41之中央處埋設複數發光二極 妝為例。當然’在另外實施例中，背光模組還可同時呈有 複數個上述態樣的發光單元。簡而言之，本創作並不限制 M412377 發光單兀的種類、數量及設置位置，而發光單元設置於導 光板之一面即為導光板之入光面。Taking the backlight module of the liquid crystal display device as an example, depending on the position of the different light sources, the moonlight pull group can be divided into two types: direct type direct and edge light type. As shown in FIG. 1 , a conventional edge-lit backlight module 1 includes a light guide plate u, a light-emitting unit 12, a PriSmSheet 13' diiffractive moon Uiffusing sheet 14, and a reflection sheet 15 . And - mixed 16. The light-emitting unit 12 having the light-emitting diodes is disposed on the side of the light guide plate u, the two diffusion sheets 14 are disposed on one of the light-emitting surfaces 111 of the light guide plate 11, and the top-sheet 13 is disposed on the second diffusion sheet. The reflection sheet 15 is adjacent to the bottom surface of the light guide plate u opposite to the light exit surface (1). The light guide plate „, the cymbal sheet 13, the diffusion sheet Μ and the reflection sheet 15 are all fixed by the plastic frame 16. When the light emitted by the light-emitting unit 12 is incident on the light guide plate 1 , most of the light will be on the guide wire. Between the light-emitting surface (1) of the 11 and the bottom surface, a full-reverse M412377 --------------- a ^ is encountered until it hits the bottom surface of the light guide plate u (not shown; The line will be scattered to destroy the total reflection, so that the light emitted by the light guide plate 11 (1) will be emitted from the light guide plate U. After the light of the light plate is passed through the moon and the diffusion sheet, good optical characteristics can be obtained, thereby providing a sentence. The uniform surface light source to a liquid crystal display panel. The backlight module of the prior art 〖gel frame ί6 to ^ he light _, can also prevent the light from being emitted from the side of the light guide (four) to the phenomenon of leakage first. 'However with the backlight The module 1 gradually becomes light and thin - the plastic frame manufactured by injection molding becomes harder to design and manufacture, and the thinner frame 16 is also easy to manufacture or: process t is broken or damaged, resulting in the f-light module丨(4) The yield is reduced. Another conventional technique for solving the light leakage is to reflex the reflection sheet 15 The side surface of the light guide plate 11 is shielded (not shown), or an additional reflective sheet 15' is disposed on the side of the light guide plate 11. However, since the reflection sheet 15 still has a part of light penetration, the light leakage prevention effect of the method is still poor.曰, therefore, 'how to provide a backlight module, which can prevent light leakage from the side of the light guide plate, thereby improving the utilization of light, has become one of the important topics. [New content] In view of the above problems, the purpose of this creation is Providing a backlight module to prevent light leakage on the side of the light guide plate, and improving the utilization of light. To achieve the above object, a backlight module according to the present invention includes a light guide plate, at least one light emitting unit, and a The flexible film material is disposed on one surface of the light guide plate. The size of the flexible film material is larger than the size of the light guide plate, and the M412377 flexible film material covers at least part of the light guide plate, and the flexible film material has a light shielding film. The light shielding unit covers at least one side of the light guide plate. In one embodiment, the light emitting unit is disposed on a surface of the light guide plate as a light incident surface. In an embodiment The light guide plate further includes a light emitting surface and a bottom surface opposite to the light emitting surface, and the side surface is coupled to the light emitting surface and the bottom surface. In an embodiment, the flexible film material covers the light emitting surface and the side surface of the light guiding plate, and is preferably. The flexible film further covers a portion of the bottom surface. In one embodiment, the flexible film has a plurality of openings corresponding to the plurality of microstructures of the light exiting surface. In one embodiment, the flexible film has a The light transmitting portion corresponds to the light emitting surface. In one embodiment, the flexible film covers the bottom surface and the side surface of the light guide plate, and preferably, the flexible film material covers a portion of the light exiting portion. In one embodiment, the backlight module further includes a reflective sheet disposed on the bottom surface of the light guide plate, and the flexible film material at least partially covers the reflective sheet. In an embodiment, the flexible film material is A light absorbing film, the area of the light shielding portion is substantially equal to the area of the flexible film material. Preferably, the flexible film further has a reflective layer on the inner surface of the flexible film facing the light guide plate. In one embodiment, the flexible film is a light transmissive film and the light shielding portion is a light absorbing layer. Preferably, the flexible film further has a reflective layer, the reflective layer and the light absorbing layer are on the same side of the flexible film, and the reflective layer is closer to the light guide plate. Preferably, the flexible film further has a reflective layer, the reflective layer and the 5 M412377 light absorbing layer are on different sides of the flexible film, and the reflective layer is closer to the light guide plate. In one embodiment, the flexible film is a reflective film and the light-shielding portion is a light absorbing layer. In one embodiment, the illumination unit comprises a light emitting diode, or a fluorescent tube or a laser. According to the above description, in the backlight module of the present invention, at least one side of the light guide plate is covered by the flexible film, and the light is shielded by the light shielding portion of the flexible film to prevent light from being guided from the light guide plate. The side is shot to achieve the effect of preventing light leakage on the side of the backlight module. Compared with the conventional one, the flexible film can replace the plastic frame of the conventional backlight module, which contributes to the thinning of the backlight module, but does not have the disadvantage of the plastic frame, thereby enabling the assembly of the backlight module. The rate is improved. In addition, the backlight module using the flexible film material has a simple assembly method and can be cut to a corresponding size according to different product designs, thereby reducing the cost of the film when manufacturing the plastic frame, and contributing to a reduction in manufacturing cost. [Embodiment] Hereinafter, a backlight module 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. 2A is an exploded perspective view of the backlight module 2 of the first embodiment of the present invention, and FIG. 2B is a schematic diagram of the combination of the backlight module 2 of the first embodiment. As shown in FIG. 2A and FIG. 2B, the backlight module 2 includes a light guide plate 21, a light emitting unit 22, and a flexible film 23. The backlight module 2 can be used for: an illuminated keyboard, a liquid crystal display device or an advertising light box. Here, the backlight module 2 applied to the illuminated keyboard is taken as an example. The V-light plate 21 has a light-emitting surface 2 ιι and a bottom surface 2 1 2 opposite to the light-emitting surface, and a middle surface rr rr ^ 1 - between the front surface 2 ll and the bottom surface 21 12 has a plurality of side surfaces 213 connected to the light surface 9 ] One of the bottom surfaces 212. Wherein, the guiding surface & surface 212 may have a plurality of printing dots (not shown). When the light plate 21 is transmitted to the entire light guiding plate by the total reflection, the light is scattered to the printing dot, thereby causing scattering and destroying the total reflection. η is emitted from the light exit surface 211 of the light guide plate 21. In general, the material used for the guide is polymethyl methacrylate (ΡΜΜΑ), polycarbonate (pc), or polystyrene (ps). The electro-optical element 22 is set in the 暮 〇 〇 照射 照射 照射 〇 〇 〇 〇 〇 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 Tenth, the light emitting unit 22 can include, for example but not limited to, at least one = first diode, or - a fluorescent tube or a laser. Herein, the backlight module 2 of the backlight module 2 is exemplified, and the X, 'early 70 22 having the light-emitting diodes are located on the side of the light guide plate 21. Of course, when the backlight module 2 is a direct-lit backlight module, the light-emitting diodes can be disposed adjacent to the bottom surface 212 of the light guide plate 21, and the light is received by the bottom surface 212. In addition to being able to be on the side or bottom surface 212 of the light guide plate 21, in other embodiments, the light-emitting unit 42 can also be embedded in the guide wire as shown in the figure, and the light-emitting plate 41 is used as the light guide plate 41. For example, a plurality of light-emitting diodes are embedded in the center. Of course, in another embodiment, the backlight module can simultaneously exhibit a plurality of light-emitting units of the above-described aspects. In short, this creation does not limit the type, number and location of the M412377 light-emitting unit, and the light-emitting unit is placed on one side of the light guide plate to be the light-incident surface of the light guide plate.
可撓性膜材23之尺寸大於導光板21之尺寸，其係用 以包復至）。卩分導光板21 ’例如是由出光面211或是由底 面212來包覆導光板21，需強調的是，說明書中所述「導 光板之尺寸」一詞係指導光板21之出光面211或底面Η] 的面積或體積；「可撓性膜材之尺寸」一詞則係指可繞性 膜材23包覆住導光板21時之面積或體積。可挽性膜材μ 具有-遮光部231，遮光部231於可撓性膜材23包覆導光 板^時係遮蔽住導光板21之至少一側面213，以防 ，少背光肋2側面的漏光。本實施财，可撓性膜材U 遮光的可撓性膜材，例如為以摻雜有深色的顔 枓或以斗的可撓性膜材，而呈現整個可撓性膜材23均為 遮先部如；當然，遮光部231可為利用外加 置 於可撓性膜材23的-遮光層，被遮光部2。置 可以是被吸收或被反射回導弁你7彳南 口尤'，泉 再推-m 0，此部分將於下面 〆乍敘述。另外，可撓性膜材23 盘道止七λ 1 ^ 71 丁知尤早兀22 /、板21 一併包覆，惟可撓性膜材23之遮光 不用遮蔽住笋井罝分π + — I尤4231可 ” ^ 本實施例#，則以可撓性膜材 匕设並遮蔽導光板21未設 、 213 , -Γ4* L 另知尤爭兀* 22的三個側面 α⑦性膜材23並未包覆住發光單元22。 ，可触騎23係射 -往上包覆住導m = ’當可繞性膜材23由底面 導7^ 21之底面212 «及複數側面213 M412377 光部2M則對應該等側面213設置。在實際包覆導 先板21的過程中，可撓性膜材23可 = 用雙面膠或接著劑而進二 以避免包覆好導光板21的可撓性膜材 =固定可挽性膜材23包覆住導光板21後的形狀二J 了可以將導光板21與可撓性膜材23黏合固定。 性膜材23彎折好的形狀即可。於此，：i 板1與可撓性膜材23黏合固定為例，而遮光部231传 =遮蔽住導光板21之複數側面213為例，需注意的是y 二要可撓性膜材23有遮蔽住至少—側面213，即可有助於 減少背光模組2的漏光現象。 ； =麥照圖3A及圖3B所示，圖3A為本創作第二實施 例之$光模經3的分解示意圖，圖3B為本創作第二， 例之背光模組3的組合示意圖。背光模組3包含—導= 31、-發光單元32及-可撓性膜材η具有與第一奋 施例之背光模組2大致相同的結構。而不同之處^於，二 貫施例中之可撓性膜材33係由出光面311往下來 ^板31之出光面311及至少一侧面313，甚至也可如圖4 斤不之實施態樣，可撓性膜材33a完全包覆住導光板Μ 1底面312’此變化態樣將詳細說明於後。於此，可挽性 膜材33可一併包覆鄰設於導光板刀的發光單元32,惟可 ^生膜材33的遮光部331則只遮蔽導光板31的其他側面 封U f發光單元32。同樣地，為了固定可撓性膜 可更嘗折可撓性膜材33並包覆住部分底面31〗， 9 M412377 再進行固定。 祐特別說明的是，於本會 的可撓性膜材33係具有—透、包覆住出光面311 出光面311 #置，，透光部332係對應 的^ 有幾乎與出光面扣相等或略小 勺面積，因而使可撓性膜材33勹劳 一 日士 . 匕復·^個出光面311的同 蚪，光線仍可由出光面311透 Λ、凄bb 士 出0其中’當可撓性膜材43 為透明時，透光部332可為 竹w 膜材33本身。 《置有遮光部331的可撓性 :外’本實施例中之背光模組3可更包括一反射片 材33射/ 34 11又置於導光板31之底面312，且可撓性臈 才33至少部分包覆設置於底面312的反射片34。設置反 于片34可將從導光板31底面312漏出的光線反射回導光 反31中，以增加光線的使用效率。當然，於第一實施 中 背光模組2也可設置—反射片，且可撓性膜材^係 併包後反射片及導光扳21的底面212。 依據不同實施態樣的可撓性膜材，於製造過程可使用 不同的包覆方式包覆導光板。除了前述二實施例將可撓性 膜材由底面向上或由出光面向下包覆之方法外，還可如圖 4所示實施態樣之背光模組3 a，將可撓性膜材3 3 &沿折線 L對折後，接著將導光板31、發光單元％及反射片— 併插入並包覆於可撓性膜材33&内，然後再例如但不限於 以膠合等之方式緊密接合可撓性膜材33a的兩侧邊（可不 包含對應發光單元3 2設置位置之一側邊 > 當然，若欲以 此方式包覆如圖5A之導光板41(發光單元42埋設於導光 10 M412377 板41中央;)’則可將尚未密封之三側邊皆緊密接合。 接著’請參照圖5 A及圖5 B所示’其分別為本創作第 :貫施例之背光模組4的分解示意圖及組合示意圖。背光 杈組5A具有與圖3A所示第二實施例類似的結 可撓性膜材33、43皆由上而下地包覆住導光板31、4^ ^面3H、411及至少一侧面313、413，甚至也可完全 導光板31、41之底面312、412。與第二實施例之 組3不同的是，本實施例中之可挽性膜材具有 開1=7 433或複數透光部（圖未示），且對應出光面411 W數微結龍設置’經該等微結構M散射之光線 複數，口 433或複數透光部（圖未示）而從出光面411曰透 出’猎由複數開口 433或複數透光部（圖未示）搭配 光部431位於出光面41Γ的設置，可減少使用 ^北、 光模組4的出光面411之漏光。盆 '月 .^ ΗΒ , &局九其中，备可撓性膜材43The size of the flexible film 23 is larger than the size of the light guide plate 21, which is used for wrapping. For example, the light guide plate 21' covers the light guide plate 21 by the light exit surface 211 or the bottom surface 212. It should be emphasized that the term "the size of the light guide plate" in the specification refers to the light exit surface 211 of the light guide plate 21 or The area or volume of the bottom surface ;]; the term "the size of the flexible film material" means the area or volume when the flexible film 23 covers the light guide plate 21. The light-receiving film μ has a light-shielding portion 231. The light-shielding portion 231 shields at least one side surface 213 of the light guide plate 21 when the flexible film 23 covers the light guide plate 2, so as to prevent light leakage on the side of the backlight rib 2 . In the present embodiment, the flexible film material that is shielded from the flexible film material U is, for example, a flexible film material doped with a dark color or a bucket, and the entire flexible film material 23 is present. For example, the light shielding portion 231 may be a light shielding layer 2 that is placed on the flexible film 23 by the light shielding portion 2 . The set can be absorbed or reflected back to the guide. You can also push the -m 0, which will be described below. In addition, the flexible film 23 is closed at seven λ 1 ^ 71, and the plate 21 is coated together, but the light shielding of the flexible film 23 does not need to shield the bamboo well 罝 π + — I Especially 4231 can be " ^ In this embodiment #, the flexible film is disposed and shielded from the light guide plate 21, 213, - Γ 4 * L, and the three side α7 film 23 of the special 兀 * 22 The light-emitting unit 22 is not covered. It can be touched by the 23-ray-up to cover the guide m = 'When the windable film 23 is guided by the bottom surface 7^21 from the bottom surface 212 « and the plural side surface 213 M412377 light portion 2M is disposed corresponding to the side surface 213. In the process of actually covering the guiding plate 21, the flexible film 23 can be replaced with a double-sided tape or an adhesive to avoid the flexibility of coating the light guide plate 21. The film material = the shape of the fixed light guide film 23 covering the light guide plate 21, and the light guide plate 21 and the flexible film material 23 can be bonded and fixed. The shape of the film material 23 can be bent. Here, the i-plate 1 is bonded and fixed to the flexible film 23 as an example, and the light-shielding portion 231 transmits the plurality of side faces 213 of the light-guide plate 21 as an example. Note that the y-two flexible film 23 is required. Covered At least the side surface 213 can help reduce the light leakage phenomenon of the backlight module 2. Fig. 3A is a schematic exploded view of the optical mode 3 of the second embodiment of the present invention, as shown in Fig. 3A and Fig. 3B. 3B is a schematic diagram of the combination of the backlight module 3 of the second and second embodiments. The backlight module 3 includes a guide 31, a light-emitting unit 32, and a flexible film η having a backlight pattern of the first embodiment. The group 2 has substantially the same structure, and the difference is that the flexible film 33 in the second embodiment is directed from the light-emitting surface 311 to the light-emitting surface 311 of the plate 31 and at least one side surface 313, and may even be 4, the flexible film 33a completely covers the light guide plate Μ 1 bottom surface 312'. This variation will be described in detail later. Here, the removable film 33 can be coated together. The light-emitting unit 32 is disposed adjacent to the light guide plate cutter, but the light-shielding portion 331 of the raw material film 33 shields only the other side surface of the light guide plate 31 from the light-emitting unit 32. Similarly, in order to fix the flexible film, it can be tasted. Fold the flexible film 33 and cover part of the bottom surface 31, 9 M412377 and fix it. It is specially stated that the flexibility of the meeting. The material 33 has a light-emitting surface 311 that is transparent to the light-emitting surface 311, and the light-transmitting portion 332 has an area equal to or slightly smaller than the light-emitting surface buckle, thereby making the flexible film 33 勹劳日士. 匕 · ^ ^ ^ ^ ^ ^ ^ ^ 311 311 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 311 The bamboo w film 33 itself. The flexibility of the opaque portion 331: the backlight module 3 in this embodiment may further include a reflective sheet 33/34 11 and placed on the bottom surface 312 of the light guide plate 31. And the flexible cymbal 33 at least partially covers the reflective sheet 34 disposed on the bottom surface 312. The opposite plate 34 is provided to reflect the light leaked from the bottom surface 312 of the light guide plate 31 back into the light guide 31 to increase the efficiency of use of the light. Of course, in the first embodiment, the backlight module 2 can also be provided with a reflective sheet, and the flexible film can be combined with the back surface of the reflective sheet and the bottom surface 212 of the light guide plate 21. According to different embodiments of the flexible film, the light guide plate can be covered by different coating methods during the manufacturing process. In addition to the above two embodiments, the flexible film is coated from the bottom surface or the light-emitting surface downward, and the backlight module 3 a can be implemented as shown in FIG. 4 , and the flexible film 3 3 is used. & After folding along the fold line L, the light guide plate 31, the light-emitting unit %, and the reflection sheet are then inserted and wrapped in the flexible film 33& and then, for example, but not limited to, glued or the like. Both sides of the flexible film 33a (may not include one side of the position where the corresponding light-emitting unit 3 2 is disposed); of course, if the light guide plate 41 as shown in FIG. 5A is to be wrapped in this manner (the light-emitting unit 42 is buried in the light guide 10) M412377 plate 41 center;) 'The three sides that have not been sealed can be tightly joined. Then, please refer to FIG. 5A and FIG. 5B, which are respectively the creation of the backlight module 4 of the present embodiment. The schematic diagram and the combined schematic diagram of the backlight unit 5A having the junction flexible films 33 and 43 similar to the second embodiment shown in FIG. 3A are covered with the light guide plate 31, 4^^3H, 411 from top to bottom. And at least one side 313, 413, or even the bottom surfaces 312, 412 of the light guide plates 31, 41. The difference of the group 3 of the embodiment is that the switchable film in the embodiment has an opening of 1=7 433 or a plurality of transparent portions (not shown), and the corresponding light-emitting surface 411 W is micro-knotted. The light rays scattered by the microstructure M are plural, and the port 433 or a plurality of light transmitting portions (not shown) are exposed from the light emitting surface 411. The hunting is located by the plurality of openings 433 or the plurality of light transmitting portions (not shown) and the light portion 431 is located. The arrangement of the light-emitting surface 41Γ can reduce the light leakage of the light-emitting surface 411 of the use of the north and the light module 4. The basin 'month. ^ ΗΒ , &
接$ ’透先部（圖未示）可為未設置有遮光部431的可 撓性膜材43本身。 J 於此，如前所述，本實施例中之發光單元4 設於導光板41中為例。另外，太舍 “里 更可具有複數通孔48貫f H 4 貝牙等尤扳41及反射片44。 i螺可人用以ΓΓ模組4與其他部件（例如裝置之殼體）组 置開:/、，可挽性膜材43亦可對應上述通孔48的位 於上述實施例中的可撓性膜材23、33、们 “ 部231、33卜431對應各個實施例可具有多種不同的= M412377 態樣，以下的圖6A至圖6C，係以圖2B中沿剖面線A-A 之剖面方向為例，以說明具有不同遮光部態樣的背光模 組。以下也一併參閱圖6A〜6C，以及圖2B。 如圖6A所示，發光單元22係設置於導光板21之一 側面，而可撓性膜材23a由底面212往上包覆導光板21 之複數側面213及底面212。本實施例中，可撓性膜材23a 為一透光膜材’其更具有一吸光層234及一反射層235， 並且吸光層234為一遮光部231。其中，反射層235可例 如但不限於為白色塗層或金屬反射層，吸光層234可例如 但不限於為黑色塗層，且反射層235與吸光層234皆可以 印刷、喷塗、黏合、沉積、或電鍍等方式形成於可撓性膜 材23a上。於此，反射層235與吸光層234係位於可撓性 膜材23a的不同側，且反射層235較接近導光板21，簡而 言之，反射層235、吸光層234與可撓性膜材23a的設置 關係由内而外依序為反射層235、可撓性膜材23a及吸光 層234。但在其他實施態樣中，反射層235與吸光層234 也可位於可撓性膜材23a的同一側，且反射層235較接近 導光板21 ’也就是說，當反射層235與吸光層234位於可 撓性膜材23a的内側時，反射層235、吸光層234與可撓 性膜材23a的設置關係由内而外依序為反射層235、吸光 層234及可撓性膜材23a ;當反射層235與吸光層234位 於可撓性膜材23a的外侧時，反射層235、吸光層234與 可撓性膜材23a的設置關係由内而外依序為可撓性膜材 23a、反射層235及吸光層234。於此，可撓性膜材23的 12 M412377 外表面皆被吸光層234覆蓋，而形成遮光部23i。 請參照圖6B所示，可換性膜材咖本身係為—吸光 膜材，因此’遮光部231的尺寸實質上等於可挽性膜材別 的尺寸。其中，可撓性膜材23b更可具有—反射層况， 反射層235位於可撓性膜材23b面對導光板21之一内表 面。其中，吸光膜材可例如但不限於為黑色或深色膜材， -反射層235可例如但不限於為白色塗層或金屬反射膜，且 • 反射層235同樣可以印刷、喷塗、黏合、沉積、或電鍛等 ® 方式形成於可撓性膜材23b上。 請參照圖6C所示，可撓性膜材2孔本身係為—反光 膜材，其更具有一吸光層234 ,吸光層234位於可撓性膜 材23b之一外表面，且遮光部231係為吸光層234。其中， 反光膜材可例如但不限於為白色膜材，吸光層234可例如 但不限於為黑色塗層，且吸光層234同樣可以印刷、噴塗、 黏合、沉積、或電鍍等方式形成於可撓性膜材23c上。. • 請參照圖6D所示，其係為沿圖3B之B_B剖面線之 . 示意圖，其中反射片34係省略未晝出。一併參閱圖6D及 3B，可撓性膜材33b係由出光面311往下包覆導光板31 之側面313，而可撓性膜材33b為一透光膜材，其更具有 一吸光層334及一反射層335，並且遮光部331係為吸光 層334。可撓性膜材33b係以遮光部331遮蔽導光板31之 侧面313，而未設置遮光部331之處，則成為透光部μ]， 且透光部332可具有幾乎與出光面311相等或略小的面 積。其中’反射層335及吸乇層334的材質及形成方式， M412377 係已於前述實施例敘述，於此不再重覆。 上述之可撓性膜材23b、23c、33b，亦可應用於圖5A 所示實施例之背光模組4，由出光面411往下地包覆導光 板41之出光面411及至少一側面413，甚至也可完全包覆 住導光板41之底面412。並且可撓性膜材23b、23c、33b 對應於出光面411之微結構Μ處具有複數開口（如圖5A 中之開口 433 )或複數透光部（圖未示），俾使光線藉由該 等開口 433或透光部透出。 本創作亦揭露應用上述背光模組之鍵盤及液晶顯示 裝置，其中，圖7為本創作第三實施例之背光模組4應用 於一鍵盤6時的分解示意圖。鍵盤6包括一按鍵部65及 一背光模組4，背光模組4之部分結構係與第三實施例中 之背光模組4相同，其包括一導光板41、一發光單元42、 一可撓性膜材43及一反射片44，此外，背光模組4還可 包括一電路板46，電路板46係與發光單元42電性連接。 其中，按鍵部65可為可透光的材質，而可撓性膜材43的 複數開口 433除了對應導光板41出光面之複數微結構（如 圖5Α之Μ)外，亦可對應於按鍵部65上的複數按鍵651， 以使光線可由按鍵651處透出，而形成發光的鍵盤6。此 外，鍵盤6中之背光模組4當然也可以利用背光模組2、 背光模組3或背光模組3 a來取代。 如圖8所示，其為本創作第二實施例之背光模組3應 用於液晶顯示裝置7時的分解示意圖。液晶顯示裝置7包 括一液晶顯示面板77及背光模組3b，背光模組3b除了與 M412377 圖3A的背光模組3具有同樣的導光板31、發光單元32、 可撓性膜材33及反射片34以外，背光模組3b還包括了 二擴散片38及一稜鏡片39等光學膜片。由導光板31射 出的光線穿過可撓性膜材33之透光部332之後，再經過 擴散片38及稜鏡片39後，其光線的亮度分布更加均勻， 且正面亮度也能有效地提升，最後由背光模組3b射出之 ' 光線則可提供一均勻的面光源，以供液晶顯示面板77成 • 像使用。 • 綜上所述，依據本創作之背光模組，係利用可撓性膜 材包覆導光板之至少一侧面，並且藉由可撓性膜材之遮光 部來遮蔽光線，避免光線從導光板之側面射出，以達到防 止背光模組側面漏光之功效。與習知相較，可撓性膜材可 取代習知背光模組之膠框，有助於背光模組的薄型化，但 不會有膠框的缺點，進而能使背光模組的組裝良率得以提 升。此外，使用可撓性膜材之背光模組，其組裝方法簡便 φ 且可隨不同的產品設計作對應的尺寸裁切，減少製造膠框 _ 時的膜具費用，有助於製造成本的降低。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本創作之精神與範疇，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1為一種習知之背光模組的示意圖； 圖2A為本創作第一實施例之一種背光模組的分解示 15 M412377 意圖； 圖2B為本創作第一實施例之一種背光模組的組合示 意圖， 圖3A為本創作第二實施例之一種背光模組的分解示 意圖； 圖3B為本創作第二實施例之一種背光模組的組合示 意圖； 圖4為圖3A所示實施例之背光模組的另一實施態樣 的示意圖； 圖5A為本創作第三實施例之一種背光模組的分解示 意圖； 圖5B為本創作第二實施例之一種背光模組的組合示 意圖； 圖6A至圖6D為本創作第二實施例之可撓性膜材不同 的實施態樣剖面圖； 圖7為本創作第三實施例之背光模組應用於鍵盤時的 分解示意圖；以及 圖8為本創作第二實施例之背光模組應用於液晶顯示 器時的分解示意圖。 【主要元件符號說明】 〔習知〕 I :背光模組 II :導光板 16 M412377 111 :出光面 12 :發光單元 13 :稜鏡片 . 14 ·擴散片 15 :反射片 16 :膠框 〔本創作〕 2、3、3a、3b、4 :背光模組 21、 31、41 :導光板 22、 32、42 :發光單元 39 :稜鏡片 38 :擴散片 34、44 :反射片 211、 311、411 :出光面 212、 312、412 :底面 213、 313、413 :彻J 面 23、 23a、23b、23c、33、33a、33b、43 :可撓性膜材 231、331、431 :遮光部 234、 334 :吸光層 235、 335 :反射層 332 :透光部 433 :開口 46 :電路板 48 :通孔 17 M412377 6 :鍵盤 65 :按鍵部 651 :按鍵 7 :液晶顯示裝置 7 7 .液晶喊不面板 A-A :剖面線 B-B :剖面線 L :折線 Μ :微結構The permeable portion (not shown) may be the flexible film member 43 itself which is not provided with the light shielding portion 431. Here, as described above, the light-emitting unit 4 in the present embodiment is provided in the light guide plate 41 as an example. In addition, the "Tai She" can have a plurality of through holes 48 through the f H 4 shell teeth and the like 41 and the reflection sheet 44. The i screw can be used to assemble the module 4 with other components (such as the housing of the device) The opening: /, the removable film 43 may also correspond to the flexible film 23, 33 of the above-mentioned embodiment corresponding to the through hole 48, and the "parts 231, 33, 431 may have various differences corresponding to the respective embodiments. For the M412377 aspect, the following FIG. 6A to FIG. 6C are taken as an example of the cross-sectional direction along the section line AA in FIG. 2B to illustrate a backlight module having different light shielding portions. 6A to 6C, and FIG. 2B are also referred to below. As shown in FIG. 6A, the light-emitting unit 22 is disposed on one side of the light guide plate 21, and the flexible film 23a covers the plurality of side faces 213 and 212 of the light guide plate 21 from the bottom surface 212. In this embodiment, the flexible film material 23a is a light-transmissive film material, which further has a light-absorbing layer 234 and a reflective layer 235, and the light-absorbing layer 234 is a light-shielding portion 231. The reflective layer 235 can be, for example but not limited to, a white coating or a metal reflective layer. The light absorbing layer 234 can be, for example but not limited to, a black coating, and the reflective layer 235 and the light absorbing layer 234 can be printed, sprayed, bonded, and deposited. Or formed by electroplating or the like on the flexible film member 23a. Here, the reflective layer 235 and the light absorbing layer 234 are located on different sides of the flexible film 23a, and the reflective layer 235 is closer to the light guide plate 21, in short, the reflective layer 235, the light absorbing layer 234 and the flexible film material The arrangement relationship of 23a is the reflection layer 235, the flexible film 23a, and the light absorption layer 234 from the inside to the outside. In other embodiments, the reflective layer 235 and the light absorbing layer 234 may also be located on the same side of the flexible film 23a, and the reflective layer 235 is closer to the light guide plate 21', that is, when the reflective layer 235 and the light absorbing layer 234 When disposed on the inner side of the flexible film 23a, the reflective layer 235, the light absorbing layer 234 and the flexible film 23a are disposed in order from the inside to the outside of the reflective layer 235, the light absorbing layer 234 and the flexible film 23a; When the reflective layer 235 and the light absorbing layer 234 are located outside the flexible film 23a, the arrangement relationship between the reflective layer 235, the light absorbing layer 234 and the flexible film 23a is sequentially from the inside to the outside of the flexible film 23a, The reflective layer 235 and the light absorbing layer 234. Here, the outer surface of the 12 M412377 of the flexible film 23 is covered by the light absorbing layer 234 to form the light shielding portion 23i. Referring to Fig. 6B, the replaceable film material itself is a light absorbing film, and therefore the size of the light shielding portion 231 is substantially equal to the size of the film. The flexible film 23b may further have a reflective layer, and the reflective layer 235 is located on the inner surface of the flexible film 23b facing one of the light guide plates 21. The light absorbing film may be, for example but not limited to, a black or dark film, and the reflective layer 235 may be, for example but not limited to, a white coating or a metal reflective film, and the reflective layer 235 may also be printed, sprayed, bonded, A deposition method, or electric forging, is formed on the flexible film 23b. Referring to FIG. 6C, the flexible film 2 hole itself is a reflective film, and further has a light absorbing layer 234. The light absorbing layer 234 is located on an outer surface of the flexible film 23b, and the light shielding portion 231 is It is a light absorbing layer 234. The reflective film can be, for example but not limited to, a white film, and the light absorbing layer 234 can be, for example but not limited to, a black coating, and the light absorbing layer 234 can also be formed by printing, spraying, bonding, depositing, or electroplating. On the film 23c. Please refer to FIG. 6D, which is a cross-sectional view taken along line B_B of FIG. 3B, in which the reflection sheet 34 is omitted. Referring to FIGS. 6D and 3B, the flexible film 33b is covered by the light-emitting surface 311 to the side 313 of the light guide plate 31, and the flexible film 33b is a light-transmissive film having a light-absorbing layer. 334 and a reflective layer 335, and the light shielding portion 331 is a light absorbing layer 334. The flexible film member 33b shields the side surface 313 of the light guide plate 31 with the light shielding portion 331, and the light transmission portion μ is formed where the light shielding portion 331 is not provided, and the light transmission portion 332 may have almost the same as the light exit surface 311 or A slightly smaller area. The material and formation of the reflective layer 335 and the suction layer 334 are described in the above embodiments, and are not repeated here. The above-mentioned flexible film materials 23b, 23c, and 33b can also be applied to the backlight module 4 of the embodiment shown in FIG. 5A, and the light-emitting surface 411 and at least one side surface 413 of the light guide plate 41 are covered downward by the light-emitting surface 411. It is even possible to completely cover the bottom surface 412 of the light guide plate 41. And the flexible film 23b, 23c, 33b has a plurality of openings (such as the opening 433 in FIG. 5A) or a plurality of transparent portions (not shown) corresponding to the microstructure of the light-emitting surface 411, so that the light is used by the light-emitting surface 411 The opening 433 or the light transmitting portion is exposed. The present invention also discloses a keyboard and a liquid crystal display device using the above backlight module. FIG. 7 is an exploded perspective view showing the backlight module 4 of the third embodiment applied to a keyboard 6. The keyboard 6 includes a button portion 65 and a backlight module 4. The backlight module 4 has the same structure as the backlight module 4 of the third embodiment, and includes a light guide plate 41, a light emitting unit 42, and a flexible unit. The backlight module 4 and the reflective sheet 44 further include a circuit board 46 electrically connected to the light emitting unit 42. The button portion 65 may be a light transmissive material, and the plurality of openings 433 of the flexible film 43 may correspond to the plurality of micro structures of the light emitting surface of the light guide plate 41 (as shown in FIG. 5 ), and may also correspond to the button portion. A plurality of buttons 651 on 65 are provided so that light can be transmitted through the button 651 to form a keyboard 6 that emits light. In addition, the backlight module 4 in the keyboard 6 can of course be replaced by the backlight module 2, the backlight module 3 or the backlight module 3 a. As shown in FIG. 8, it is an exploded view of the backlight module 3 of the second embodiment when applied to the liquid crystal display device 7. The liquid crystal display device 7 includes a liquid crystal display panel 77 and a backlight module 3b. The backlight module 3b has the same light guide plate 31, light-emitting unit 32, flexible film 33 and reflective sheet as the backlight module 3 of M412377 and FIG. 3A. In addition to the 34, the backlight module 3b further includes an optical film such as a diffusion sheet 38 and a cymbal sheet 39. After the light emitted from the light guide plate 31 passes through the light transmitting portion 332 of the flexible film 33, and then passes through the diffusion sheet 38 and the cymbal sheet 39, the brightness distribution of the light is more uniform, and the front brightness can be effectively improved. Finally, the light emitted by the backlight module 3b provides a uniform surface light source for use by the liquid crystal display panel 77. In summary, according to the backlight module of the present invention, at least one side of the light guide plate is covered with a flexible film, and the light is shielded by the light shielding portion of the flexible film to avoid light from the light guide plate. The side is shot to achieve the effect of preventing light leakage on the side of the backlight module. Compared with the conventional one, the flexible film can replace the plastic frame of the conventional backlight module, which contributes to the thinning of the backlight module, but does not have the disadvantage of the plastic frame, thereby enabling the assembly of the backlight module. The rate is improved. In addition, the backlight module using the flexible film material has a simple assembly method and can be cut according to different product designs, thereby reducing the cost of manufacturing the plastic frame and contributing to the reduction of manufacturing cost. . The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional backlight module; FIG. 2A is an exploded view of a backlight module according to a first embodiment of the present invention; FIG. 2B is a first embodiment of the present invention; 3A is a schematic exploded view of a backlight module according to a second embodiment of the present invention; FIG. 3B is a schematic diagram of a combination of a backlight module according to a second embodiment of the present invention; FIG. FIG. 5A is an exploded perspective view of a backlight module according to a third embodiment of the present invention; FIG. 5B is a schematic diagram of a combination of a backlight module according to a second embodiment of the present invention; 6A to FIG. 6D are cross-sectional views showing different embodiments of the flexible film according to the second embodiment of the present invention; FIG. 7 is an exploded perspective view showing the backlight module of the third embodiment applied to the keyboard; 8 is an exploded schematic view of the backlight module of the second embodiment of the present invention applied to a liquid crystal display. [Description of main component symbols] [General] I: Backlight module II: Light guide plate 16 M412377 111: Light-emitting surface 12: Light-emitting unit 13: Sepals. 14 · Diffusion sheet 15: Reflective sheet 16: Plastic frame [This creation] 2, 3, 3a, 3b, 4: backlight modules 21, 31, 41: light guide plates 22, 32, 42: light-emitting unit 39: slap 38: diffuser 34, 44: reflective sheets 211, 311, 411: light Surfaces 212, 312, and 412: bottom surfaces 213, 313, and 413: J faces 23, 23a, 23b, 23c, 33, 33a, 33b, and 43: flexible film members 231, 331, and 431: light blocking portions 234, 334: Light absorbing layer 235, 335: reflective layer 332: light transmitting portion 433: opening 46: circuit board 48: through hole 17 M412377 6: keyboard 65: button portion 651: button 7: liquid crystal display device 7 7. liquid crystal shouting panel AA: Section line BB: section line L: line line Μ: microstructure