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PT1299 27641twf.doc/n 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種反光背板，且特別是有關於一種 適用於液晶顯示器的直下式背光模組的反光背板。 【先前技術】 近年來’由於液晶顯示器以輕、薄、小以及耗電低等 特點，在筆記型電腦、數位相機、電視等電子影像產品上 知到了廣泛的應用，並逐漸取代了傳統陰極射線管（CRT， Cathode ray tube)顯示器。 液晶顯示器主要包括兩部份，一液晶面板以及一背光 =組。液晶面板主要藉由液晶分子的轉動及偏光板，來改 變光線在不同區域的通過量，在不同區域造成明暗差異， 以達到影像顯示的目的。由於液晶本身並不具備發光特 ^ ’故須依賴背光模組提供光源。依照光源位置的不同， 背光模組一般可分為直下式與側光式兩種，其中直下式背 ，模組因其光源設置於液晶顯示面板的正下方，故具有較 j的亮度，並多使用於監視器以及液晶電視等大尺顯示 设備上。 曰在現今液晶顯示器的使用上，越來越多的應用是將液 曰曰員不器以壁掛方式懸於牆上或戶外看板，因此輕量化有 ^定的市場趨勢，而背光餘又是液晶的關鍵組 。直下式的背光模組主要構件有膠框、光學模片、擴散 板、，源組固定件、燈源組、擴散板及燈源支撐架反射 片、背板、電壓轉換器、電壓轉換器保護蓋等，而在此組 5 1378296 PT1299 27641twf.d〇c/n 成架構中，背板即佔了整體背光模組總重量的一半以上。 因此，背板能否減輕重量，決定液晶顯示器能否符合 輕量化的趨勢。 . 目1為習知之-種直下式背光模_背板的示意圖。 =參考® 1，習知之背板主要為大片的金屬材料通 • 常為鋼材加工而成的單一片材，藉以承載背光模組的其餘 組件，以及作為背光模組中鎖固、定位和散熱的主要結構。 Φ 此外，背板100還必須保留大片材料以提供防漏光及散熱 的功能，但也因此造成了液晶顯示器無法有效輕量化的主 • 要原因。 【發明内容】 本發明提出一種反光背板，其適用於一背光模組，以 降低背光模組的重量。 本發明提出一種直下式背光模組，其具有較小的重 量。 本發明之一實施例提出一種反光背板，其適用於一具 •有一燈源組的背光模組。反光背板包括一框架及一反光 片。框架具有至少一鏤空開口。反光片組裝至框架内。反 光片具有一反射層及一散熱層，其中反射層及散熱層係分 屬不同材質。反射層具有一反射面及一相對於反射面的背 面’其中反射面界定出一凹部，此凹部用以容納燈源組， 而散熱層配置於反射層的背面。 本發明之另一實施例提出一種背光模組，其包括一框 架、一反光片及一燈源組。框架具有至少一鏤空開口。反 6 PT1299 27641twf.doc/n 光片組裝至框架内。反光片具有一反射層及一散熱層’其 中反射層及散熱層係分屬不同材質。反射層具有/反射面 及一相對於反射面的背面，其中反射面界定出一凹部，而 散熱層配置於反射層的背面。燈源組容納於反光片的凹部 内。 在本發明之一實施例中，框架是由一薄板所折彎而 成，而散熱層的厚度小於薄板的厚度。 在本發明之一實施例中，框架是由多個邊樑所拼接而 成。 在本發明之一實施例中’這些邊樑之一是由一薄板所 折彎而成’而散熱層的厚度小於薄板的厚度。 在本發明之一實施例中，相鄰的這些邊樑相互銲接或 相互鎖附。 在本發明之一實施例中，框架更包括至少一支樑，跨 越鏤空開口，其兩端分別連接這些邊樑中之二。 在本發明之一實施例中，這支樑是由一薄板所折彎而 成’而散熱層的厚度小於此薄板的厚度。 在本發明之一實施例中，框架的材質包括鋁。 在本發明之一實施例中，框架的材質包括塑膠。 在本發明之一實施例中，框架更包括一散熱片其連 接至框架來封閉鏤空開口的一部分。 在本發明之一實施例中，燈源組為一燈管組。 基於上述，在本發明之上述實施例中，藉由且有鏤空 開口的框架及將反射層與散熱層互相接合後組裝至框架 PT1299 27641twf.doc/n 中，使反光施得赠_量化的目的，並#由散熱層提 供反射層遮光'支撐與散熱的功用。 ^ 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉多個實施例，並配合所附圖式，作詳細說明如下。 【實施方式】 下列各實施例的說明是參考附加的圖式，用以例示本 發明可用以實施之特定實施例。本發明所提到的方向用 語，例如「上」、「下」、「前」、「後」、「左」、「右」 等’僅是參考附加圖式的方向。因此，使用的方向用語是 用來說明，而非用來限制本發明。 圖2為本發明之一實施例的一種反光背板的分解圖， 圖3為圖2之反光背板的組合圖。請參考圖2及圖3，在 本實施例中，反光背板200適用於液晶顯示器的背光模 組。反光背板200包括一框架210及一反光片220。框架 210具有一鏤空開口 210a。反光片220組裝至框架210内。 反光片220包括一反射層222及一散熱層224。反射 層222具有一反射面222a及一相對於反射面222a的背面 222b，其中反射面222a界定出一凹部220a，用以容納燈 源組（如圖6之標號420)。散熱層224位於於反射層222 的背面222b。此外，散熱層224可依照需求而全部或局部 地分佈於反紂層222的背面222b。 在本實施例中，散熱層224可藉由黏貼、熱押、塗佈、 電鍍、蒸鍍等方式形成在反射層222上。相反地，反射層 222亦可藉由黏貼、熱押、塗佈、電鍍、蒸鍍等方式形成 1378296 PT1299 27641twf.doc/n 在散熱層224上。此外’反射層222的材質可為反射材質， 而散熱層224的材質可為金屬或其他散熱材質。 圖4為圖2之框架的分解圖。請參考圖4，框架21〇 以多個邊樑212拼接而成，拼接後的框架21〇具有鏤空開 口 210a ’藉以使反光背板2〇〇的重量減輕，降低其在背光 模組中的重量比例，以符合輕量化的目的。在本實/施例中， 這些邊樑212可以鋁製薄板折彎而成，其中相鄰的這些邊 樑212可以鎖固件互相鎖附，或是以雷射、電極互相銲接 等方式進行拼接。在另一未繒示實施例中，這歧邊禅 的材質亦可採用塑膠。 、 請再參考圖2及圖4，框架210更包括至少一支樑 214，其跨越鏤空開口 21〇a，並與這些邊樑212互相銲接 或互相鎖附，用以作為增加框架21〇的結構強度。相較於 習知技術所使用的整片鋼板，依據本實施例，較容易對支 樑214進行加強結構的處理，例如於支樑214設有較深的 肋（剖面結構為凸型時）。在本實施例中，支樑214亦可 以銘製薄板折彎而成，並且支樑2M的剖面結構可為凸型 或工型等形式，用以增加框架210的結構強度。在另一未 繪示實施例中，支樑214的材質亦可採用塑膠。 在本實施例中，框架210可藉由鋁製薄板作成支樑214 及邊襟212，以代替習知技術所使用的整片鋼板，除可維 持原本結構強度，使框架21〇得以負載其上燈源組等背光 才莫.组的相關部件’而作為背光模組中鎖固以及定位的主要 結構以外’更可減低習知背板因形狀或材質造成重量過大 9 1378296 PT1299 27641twf.doc/n 的影響，以輕量化反光背板200。 在本實施例中’散熱層224的厚度可小於上述這些彎 折後以構成邊樑212及支樑214的薄板厚度，除了符合輕 量化的目的之外，主要在降低反射層222的熱應變。因此， 除可錯由散熱層224提供反射層222遮光功能以外，更可 藉由散熱層224來協助反射層222的散熱及降低反射層 222的熱應變，讓反射層222受熱時仍維持其平整度，使 反射層222能夠均勻地反射光線。 圖5為本發明之另一實施例的一種框架的示意圖。請 參考圖5 ’在本實施例中，框架310的材質可為塑膠，以 取代習知技街所用的鋼材，而達到輕量化的功效。此外， 框架310更可一體成型，例如塑膠射出成型。 在本實施例中’框架310更可包括至少一散熱片316, 其連接至框架310，用以封閉框架310中鏤空開口 31〇a的 一部份。散熱片316可有效吸收背光模組運作時產生的熱 源。在本實施例中，由於用以固定及提供燈源組電壓的燈 源組固定件係設於框架31〇的兩側端，因此散熱片316較 佳地是設於靠近框架310的兩側端。 圖6為本發明之又一實施例的一種直下式背光模組的 不意圖。請參考圖6,在本實施例中，直下式背光模組4〇〇 包括一反光背板410及一燈源組420。反光背板410即圖3 之反光背板200，而燈源組420設於反光背板410之凹部 410a内’以作為提供直下式背光模組4〇〇的光線來源。上 述凹部41〇a即為圖3之凹部22〇a。在本實施例中，燈源 1378296 PT1299 27641twf.doc/n 組420為-燈管組’例如為冷陰極管（CCFL，⑽Cath〇de Fluorescent Lamp)。 紅上所述在本發明之上述實施例中，藉由且有鐘空 開口的框架及將反射層與散熱層互相接合後組裝至框架 中’使反光背板得以達到輕量化的目的，並藉由散熱層提 供反射層遮光、支撑與散熱的功用。 除此之外，框架除了可以多個由銘製薄板折彎成形的 操（邊樑及支襟）相互拼接來加以製造之外，更可以由塑 質-體成型。此外’框架亦可以多個由塑膠形成的樑 (邊樑及支樑）相互拼接而加以製得。 雖穌發明已以實施例揭露如上，然其並非用以限定 2明’任何所屬技術領域中具有通常知識者，在不脫離 ^明之精神和範t可作些許之更動錢飾，因此 七明之㈣_當視後附之巾請專利範圍所界定者為 發明請專利範圍不須達成本 。卩的或優點或特點。此外，摘要部分和 :之權=輔助專利文件搜尋之用，並非用來限制本發 【圖式簡單說明】 闇疋I知之種直下式背光模組的背板的示意圖。 j本發明之—實施例的—種反光f板的分解圖。 圖3為圖2之反光背板的組合圖。 圖4為圖2之框架的分解圖。 圖5為本發明之另一實施例的-種框架的示意圖。 11 1378296 PT1299 27641twf.doc/n 圖6為本發明之又一實施例的一種直下式背光模組的 示意圖。 【主要元件符號說明】 100 :背板 200 :反光背板 210 :框架 210a :鏤空開口 春 212 :邊樑 214 :支樑 220 :反光片 220a :凹部 222 :反射層 222a :反射面 222b :背面 224 :散熱層 310 :框架 • 310a :鏤空開口 316 :散熱片 400:直下式背光模組 410 :反光背板 ' 410a :凹部 420 :燈源組 12PT1299 27641twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a reflective backplane, and more particularly to a reflective backplane suitable for a direct type backlight module of a liquid crystal display. [Prior Art] In recent years, due to the characteristics of light, thin, small, and low power consumption, liquid crystal displays have been widely used in electronic imaging products such as notebook computers, digital cameras, and televisions, and have gradually replaced traditional cathode rays. Tube (CRT, Cathode ray tube) display. The liquid crystal display mainly includes two parts, a liquid crystal panel and a backlight=group. The liquid crystal panel mainly changes the throughput of light in different regions by the rotation of liquid crystal molecules and the polarizing plate, and causes differences in light and dark in different regions to achieve the purpose of image display. Since the liquid crystal itself does not have a light-emitting feature, it is necessary to rely on the backlight module to provide a light source. According to the position of the light source, the backlight module can be generally divided into two types: a direct type and a side light type. The direct type back, the module has a brightness of more than j because the light source is disposed directly below the liquid crystal display panel. It is used on large-scale display devices such as monitors and LCD TVs.曰In today's use of liquid crystal displays, more and more applications are to suspend liquid slings on the wall or outdoor kanban by wall hanging, so the light weight has a certain market trend, and the backlight is liquid crystal. Key group. The main components of the direct-lit backlight module include a plastic frame, an optical die, a diffusion plate, a source group fixing member, a light source group, a diffusion plate, and a light source support frame reflector, a back plate, a voltage converter, and a voltage converter protection. Cover, etc., and in this group of 5 1378296 PT1299 27641twf.d〇c/n architecture, the backplane accounts for more than half of the total weight of the overall backlight module. Therefore, whether the backplane can reduce the weight determines whether the liquid crystal display can meet the trend of light weight. Item 1 is a schematic diagram of a conventional direct-type backlight mode_back plate. =Reference® 1, the backplane is a large piece of metal material. A single sheet of steel is often used to carry the rest of the backlight module and to lock, position and dissipate as a backlight module. The main structure. Φ In addition, the backplane 100 must retain a large amount of material to provide light leakage and heat dissipation, but it also causes the main reason why the liquid crystal display cannot be effectively lightened. SUMMARY OF THE INVENTION The present invention provides a reflective backplane that is suitable for use in a backlight module to reduce the weight of the backlight module. The present invention provides a direct type backlight module having a small weight. One embodiment of the present invention provides a reflective backplane suitable for use in a backlight module having a light source set. The reflective backplane includes a frame and a reflector. The frame has at least one hollow opening. The reflector is assembled into the frame. The reflector has a reflective layer and a heat dissipation layer, wherein the reflective layer and the heat dissipation layer are different materials. The reflective layer has a reflective surface and a back surface opposite to the reflective surface, wherein the reflective surface defines a recess for receiving the light source set and the heat dissipation layer is disposed on the back side of the reflective layer. Another embodiment of the present invention provides a backlight module including a frame, a retroreflective sheeting, and a light source set. The frame has at least one hollow opening. Anti 6 PT1299 27641twf.doc/n Light sheets are assembled into the frame. The retroreflective sheeting has a reflective layer and a heat dissipating layer, wherein the reflective layer and the heat dissipating layer are of different materials. The reflective layer has a/reflecting surface and a back surface opposite to the reflecting surface, wherein the reflecting surface defines a recess and the heat dissipating layer is disposed on the back surface of the reflective layer. The light source group is housed in the recess of the retroreflective sheeting. In one embodiment of the invention, the frame is bent from a thin sheet and the thickness of the heat sink layer is less than the thickness of the sheet. In one embodiment of the invention, the frame is formed by splicing a plurality of side rails. In one embodiment of the invention, one of the side beams is bent by a thin plate and the thickness of the heat dissipation layer is less than the thickness of the thin plate. In an embodiment of the invention, the adjacent side rails are welded or interlocked with one another. In an embodiment of the invention, the frame further comprises at least one beam spanning the hollow opening, the two ends of which are respectively connected to two of the side beams. In one embodiment of the invention, the beam is bent by a thin plate and the thickness of the heat dissipation layer is less than the thickness of the thin plate. In an embodiment of the invention, the material of the frame comprises aluminum. In an embodiment of the invention, the material of the frame comprises plastic. In one embodiment of the invention, the frame further includes a heat sink that is coupled to the frame to close a portion of the hollow opening. In an embodiment of the invention, the light source group is a light tube group. Based on the above, in the above embodiment of the present invention, the frame of the hollow opening and the reflective layer and the heat dissipation layer are joined to each other and assembled into the frame PT1299 27641twf.doc/n, so that the reflection is given the purpose of quantization. , and # by the heat dissipation layer to provide a reflective layer to shield the function of support and heat dissipation. The above described features and advantages of the invention will be apparent from the description of the appended claims. The following description of the various embodiments is intended to be illustrative of the specific embodiments of the invention. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", etc., are merely directions in which additional drawings are referred. Therefore, the directional terminology used is for the purpose of illustration and not limitation. 2 is an exploded view of a reflective backplane according to an embodiment of the present invention, and FIG. 3 is a combined view of the reflective backplane of FIG. 2. Referring to FIG. 2 and FIG. 3, in the embodiment, the reflective backplane 200 is suitable for a backlight module of a liquid crystal display. The reflective backplane 200 includes a frame 210 and a retroreflective sheeting 220. The frame 210 has a hollow opening 210a. The retroreflective sheeting 220 is assembled into the frame 210. The retroreflective sheeting 220 includes a reflective layer 222 and a heat dissipation layer 224. The reflective layer 222 has a reflective surface 222a and a back surface 222b opposite the reflective surface 222a, wherein the reflective surface 222a defines a recess 220a for receiving the light source set (e.g., numeral 420 of Figure 6). The heat dissipation layer 224 is located on the back surface 222b of the reflective layer 222. In addition, the heat dissipation layer 224 may be wholly or partially distributed on the back surface 222b of the ruthenium layer 222 as needed. In this embodiment, the heat dissipation layer 224 can be formed on the reflective layer 222 by adhesion, heat, coating, plating, evaporation, or the like. Conversely, the reflective layer 222 can also be formed on the heat dissipation layer 224 by adhesion, heat, coating, plating, evaporation, or the like. 1378296 PT1299 27641twf.doc/n. In addition, the material of the reflective layer 222 may be a reflective material, and the material of the heat dissipation layer 224 may be metal or other heat dissipating material. Figure 4 is an exploded view of the frame of Figure 2. Referring to FIG. 4, the frame 21 is formed by splicing a plurality of side beams 212. The spliced frame 21 has a hollow opening 210a' to reduce the weight of the reflective backing plate 2 and reduce the weight in the backlight module. Proportion to meet the purpose of lightweighting. In the present embodiment, the side beams 212 may be bent from an aluminum sheet, wherein the adjacent side beams 212 may be interlocked with each other by a fastener or may be spliced by laser or electrodes. In another embodiment, the material of the sacred Zen can also be made of plastic. Referring to FIG. 2 and FIG. 4 again, the frame 210 further includes at least one beam 214 that spans the hollow opening 21〇a and is welded or interlocked with the side beams 212 for use as a structure for adding the frame 21〇. strength. Compared with the entire steel sheet used in the prior art, according to the present embodiment, it is easier to perform the reinforcing structure treatment on the support beam 214, for example, when the support beam 214 is provided with deep ribs (when the cross-sectional structure is convex). In the present embodiment, the support beam 214 can also be formed by bending a thin plate, and the cross-sectional structure of the support beam 2M can be in the form of a convex shape or a work form to increase the structural strength of the frame 210. In another embodiment, the support beam 214 may also be made of plastic. In the present embodiment, the frame 210 can be formed as a support beam 214 and a side sill 212 by an aluminum thin plate instead of the entire steel plate used in the prior art, except that the original structural strength can be maintained, so that the frame 21 can be loaded thereon. The backlight of the light source group, etc., can only be used as the main component of the locking module and the positioning of the backlight module. The effect of the lightweight reflective backplane 200. In the present embodiment, the thickness of the heat dissipating layer 224 may be smaller than the thickness of the thin plate after the bending to constitute the side sill 212 and the sill 214, and the thermal strain of the reflecting layer 222 is mainly reduced in addition to the purpose of weight reduction. Therefore, in addition to providing the light shielding function of the reflective layer 222 by the heat dissipation layer 224, the heat dissipation layer 224 can assist the heat dissipation of the reflective layer 222 and reduce the thermal strain of the reflective layer 222, so that the reflective layer 222 maintains its flatness when heated. The reflection layer 222 is capable of uniformly reflecting light. Figure 5 is a schematic illustration of a frame in accordance with another embodiment of the present invention. Please refer to FIG. 5'. In the embodiment, the material of the frame 310 can be plastic to replace the steel used in the street, and the weight reduction effect can be achieved. In addition, the frame 310 can be integrally formed, such as plastic injection molding. In the present embodiment, the frame 310 may further include at least one heat sink 316 coupled to the frame 310 for closing a portion of the hollow opening 31〇a in the frame 310. The heat sink 316 can effectively absorb the heat generated when the backlight module operates. In this embodiment, since the light source group fixing members for fixing and providing the voltage of the light source group are disposed at both side ends of the frame 31, the heat sink 316 is preferably disposed near both sides of the frame 310. . FIG. 6 is a schematic diagram of a direct type backlight module according to still another embodiment of the present invention. Referring to FIG. 6, in the embodiment, the direct type backlight module 4A includes a reflective back plate 410 and a light source group 420. The reflective backplane 410 is the reflective backplane 200 of FIG. 3, and the light source set 420 is disposed within the recess 410a of the reflective backplane 410 as a source of light for providing a direct-lit backlight module. The recess 41a is the recess 22a of Fig. 3. In the present embodiment, the light source 1378296 PT1299 27641twf.doc/n group 420 is - the tube group ', for example, a CCFL, (10) Cath〇 de Fluorescent Lamp. In the above embodiment of the present invention, the frame is opened and the reflective layer and the heat dissipation layer are joined to each other and assembled into the frame, so that the reflective back plate can be lightened and borrowed. The heat dissipation layer provides the function of shielding, supporting and dissipating the reflective layer. In addition to this, the frame can be made of plastic-body in addition to a plurality of operations (side beams and struts) which are formed by bending the inlaid sheets. In addition, the frame can also be made by splicing a plurality of beams (side beams and support beams) formed of plastic. Although the invention has been disclosed in the above embodiments, it is not intended to limit the knowledge of any of the technical fields in the art, and may be used to make some more money without departing from the spirit and scope of the invention. Therefore, Qi Mingzhi (4)_ When the scope of the patent is defined as the scope of the patent, the patent scope is not required to be obtained. Awkward or merit or characteristic. In addition, the abstract part and the right of the right = auxiliary patent file search are not used to limit the hair [simplified description] The schematic diagram of the back plate of the direct type backlight module. An exploded view of a reflective f-plate of the present invention. 3 is a combination view of the reflective backplane of FIG. 2. Figure 4 is an exploded view of the frame of Figure 2. Figure 5 is a schematic illustration of a frame of another embodiment of the present invention. 11 1378296 PT1299 27641twf.doc/n FIG. 6 is a schematic diagram of a direct type backlight module according to still another embodiment of the present invention. [Main component symbol description] 100: Back plate 200: Reflective back plate 210: Frame 210a: Hollow opening spring 212: Side beam 214: Support beam 220: Reflecting sheet 220a: Recessed portion 222: Reflecting layer 222a: Reflecting surface 222b: Back surface 224 : Heat dissipation layer 310 : frame • 310a : hollow opening 316 : heat sink 400 : direct type backlight module 410 : reflective back plate ' 410a : recess 420 : light source group 12