201211637 六、發明說明： 【發明所屬之技術領域】 本發明係與光學顯示器有關，更詳而言之是指一種反射 片，以及使用該反射片的背光模組。 【先前技術】 近來光學顯示器的體積發展日趨薄型化，且各業者莫不以 _ 此作為技術創新的重要參考指標，更據此作為行銷訴求。 光學顯示器駐要構成包括兩個部分，分別是顯示面板及 背光模組。在眾家致力於結構薄型化的同時，其中一項用於增 加背光模組投射光量的反射片亦經常是被改善的標的之一。 已知反射片是以聚醋薄膜製成，且設置在背光模組的導光 板下方’祕將自導光板散㈣且背細示面板的光束再反射 入導光板中，藉此以增加背光模組的投射光量。惟，反射片的 • 厚度越薄時’不僅在裝配過程中容易受外力不當作用導致折 相’更將降低其反射效果。雖有業者於聚醋薄膜表面加設金屬 義以強化反射能力，卻因製程的增加而不利於效率的提升， 且其製作成本為-般反射片的5倍以上。另，隨著顯示面板的 尺寸加大’前述缺失將更為顯著。 其次，該已知反射片在長期接受光照後，易因受熱而加快 質變的發生並損及反射效能。尤其現在市f日韓等國的反射片 夕為PET發泡結構’因其散熱效率差而易導致熱能多集中於 201211637 LED處並帶來高溫，此高溫現象將影響LED的材質，致使原 應投射白光的LED逐漸轉變成偏黃光的投射，如此將損及面 板的光學表現效果。 【發明内容】 有鑑於此，本發明之主要目的在於提供一種反射片，具有 提升反射能力，且不易變形的優點。 緣以達成上述目的，本發明所提供的反射片適用於一背光 模組，該反射片包含有一反光層與一強化層，其中，反光層包 括有塑膠材料，及摻雜於該塑膠材料中的至少一種反光介質， 目的在於增加光反射率；強化層位於反光層下方且内含短纖材 料，目的在於增加反射片的強度與剛性。 依據上述構思，本發明更於強化層下方設置一熱傳導層， 用以將反射片所承受的熱能往外傳導。 本發明之次要目的在於提供一種可增加投射光量的背光 模組’該背光她包含—絲、—導光板鄰近該光源、至少一 光學膜片設置於該導光板的上方，以及該反射#設置於導光板 下方，且反射片具有一反光層與一強化層，該反光層鄰近該導 光板。 【實施方式】 為此更清楚地說明本發明，兹舉較佳實施例並配合圖示詳 201211637 細說明如后。 圖1揭示具有本發明反射片10的背光模組100，該背光模 組100另包括有一膠框20、一金屬背框30、一導光板40、複 數光學膜片50與複數個以發光二極體6〇為例但不以此為限的 光源。其中’膠框20嵌設於金屬背框30的内側，具有保護依 序收容於膠框20内的反射片1〇、導光板4〇與該些光學膜片 50 ;發光二極體60設於導光板40的一侧，其產生的光束進入 導光板40後，有大部份光束將往光學膜片5〇的方向投射，部 分光束則往該反射片10方向投射。 圖2進一步揭示上述反射片10的結構，包括有一反光層 12與一強化層14。其中，反光層12是以塑膠材料 (Thermoplastic)為基材，再摻雜至少一種的反光介質Ua而 成，前述塑膠材料如聚對苯二甲酸乙酯（p〇lyethylene terephthalate，PET)、聚丙浠（Polypropylene，PP)、聚碳酸酉旨 樹脂（Polycarbonate，PC)、聚苯乙烯（Polystyrene，PS)或 丙稀晴-丁二烯-苯乙烯共聚合物（Aerylonitrile - Butadene _ Styrene，ABS)，但不以此為限；反光介質12a則以選自銀材 料或是二氧化鈦為佳，同樣地，反光介質12a之材料不以上述 為限。至於該強化層14，其位於反光層12的下方且内含短纖 材料14a ’具有穩定反光層12結構以避免因受熱變形，並提 高反射片10的抗拉變形能力。 由於反射片10的反光層12是緊鄰於導光板40,因此當光 201211637 線進入該反光層12且遭遇該些反光介質12a時，將產生多重 的折射現象，據以提升反射能力而達成增加背光模組1〇〇投射 光量的目的。其次，因反光介質12a是於該反射片1〇製作過 程中直接摻入構成該反光層12的塑膠材料中，與一般反射片 表面再塗佈金屬薄膜相較，則本發明結構具有簡化製程之效。 再者，本發明反射片1〇之反光層12底面因設置有該以短纖材 料14a為主的強化層14，俾不易變形。 另請再參圖3所示，為本發明反射片的另一較佳實施例， 與上述不同的是：本實施例的反射片70不僅具有反光層72與 強化層74，更在強化層74的下方設有一熱傳導層76，該熱傳 導層76亦以聚對苯二甲酸乙酯（pet)或聚丙烯（PP)為例 的塑膠材料為基材，再摻雜有導熱介質76a，所述導熱介質材 料76a以金屬粉末或是陶竟粉末為例，但不以此為限。 因組裝後的反射片70之熱傳導層76是貼抵於金屬背框3〇 上，故能有效地將進入該反射片70的光線所伴隨的熱能傳導 至金屬背框30，以降低反射片70因長期受熱影響而導致質變 的情形。 圖4與圖5為本發明之再一較佳實施例，其等揭示將材料 屬性與該反射片10 (或反射片70)的塑膠材料相近的膠框20 透過連結技術"而與該反射片10 (或反射片70)連結成一體， 此結構形態可確保背光模組具備反光結構，無一般背光模組在 裝設過程中可能因疏失導致遺漏反光片的缺失發生。前述連結 201211637 技術包括熱壓、膠合或黏合等。 以上所述僅為本發明較佳可行實施例而已，舉凡應用本發 明說明書及申請專利範圍所為之等效結構及製作方法變化，理 應包含在本發明之專利範圍内。 201211637 【圖式簡單說明】 圖1為本發明一較佳實施例之立體分解圖。 圖2為本發明上述較佳實施例之反射片剖視圖。 圖3為本發明另一較佳實施例之反射片剖視圖。 圖4為本發明再一較佳實施例之反射片與膠框連結示意圖。 圖5為圖4之5-5方向剖視圖。 【主要元件符號說明】 100背光模組 10反射片 12反光層 12a反光介質 14強化層 14a短纖材料 20膠框 30金屬背框 40導光板 50光學膜片 60發光二極體 70反射片 72反光層 74強化層 76熱傳導層 76a導熱介質201211637 VI. Description of the Invention: [Technical Field] The present invention relates to an optical display, and more particularly to a reflective sheet and a backlight module using the same. [Prior Art] Recently, the volume development of optical displays has become increasingly thin, and various industry players have not taken this as an important reference indicator for technological innovation, and accordingly as a marketing appeal. The optical display resident consists of two parts, a display panel and a backlight module. While the family is working on thinning the structure, one of the reflectors used to increase the amount of light projected by the backlight module is often one of the improved targets. It is known that the reflection sheet is made of a polyester film and is disposed under the light guide plate of the backlight module. The secret light from the light guide plate is dispersed (four) and the light beam of the back display panel is reflected into the light guide plate, thereby increasing the backlight mode. The amount of projected light of the group. However, the thinner the thickness of the reflection sheet is, the more it is easily damaged by the external force during assembly, which will reduce the reflection effect. Although some manufacturers add metal meaning to the surface of the polyester film to enhance the reflection ability, it is not conducive to the improvement of efficiency due to the increase of the process, and the production cost is more than 5 times that of the general reflection sheet. In addition, as the size of the display panel is increased, the aforementioned deletion will be more remarkable. Secondly, after the long-term exposure to light, the known reflection sheet is liable to accelerate the occurrence of qualitative change due to heat and to impair the reflection efficiency. In particular, the reflection film of the city f Japan, South Korea and other countries is a PET foam structure. Because of its poor heat dissipation efficiency, it is easy to cause heat to concentrate on the LED of 201211637 and bring high temperature. This high temperature phenomenon will affect the material of the LED, resulting in the original LEDs that project white light gradually turn into projections of yellowish light, which will damage the optical performance of the panel. SUMMARY OF THE INVENTION In view of the above, it is a primary object of the present invention to provide a reflection sheet which has the advantage of improving reflection ability and being less susceptible to deformation. In order to achieve the above object, the reflective sheet provided by the present invention is suitable for a backlight module, the reflective sheet includes a reflective layer and a reinforcing layer, wherein the reflective layer comprises a plastic material and is doped in the plastic material. At least one reflective medium, the purpose of which is to increase the light reflectivity; the strengthening layer is located below the light reflecting layer and contains a short fiber material for the purpose of increasing the strength and rigidity of the reflecting sheet. According to the above concept, the present invention further provides a heat conducting layer under the reinforcing layer for conducting the heat energy received by the reflecting sheet to the outside. A secondary object of the present invention is to provide a backlight module that can increase the amount of projected light. The backlight includes a wire, a light guide plate adjacent to the light source, at least one optical film disposed above the light guide plate, and the reflection # setting Under the light guide plate, the reflective sheet has a reflective layer and a reinforcing layer, and the reflective layer is adjacent to the light guide plate. [Embodiment] The present invention will be described more clearly hereinafter, and the preferred embodiment will be described in detail with reference to the accompanying drawings 201211637. 1 shows a backlight module 100 having a reflective sheet 10 of the present invention. The backlight module 100 further includes a plastic frame 20, a metal back frame 30, a light guide plate 40, a plurality of optical films 50, and a plurality of light emitting diodes. The body is a light source that is not limited to this. The plastic frame 20 is embedded in the inner side of the metal back frame 30, and has a reflective sheet 1 〇, a light guide plate 4 〇 and the optical film 50 which are sequentially received in the plastic frame 20; the light emitting diode 60 is disposed on On one side of the light guide plate 40, after the light beam generated by the light guide plate 40 enters the light guide plate 40, most of the light beam will be projected in the direction of the optical film 5〇, and a part of the light beam is projected toward the reflection sheet 10. Fig. 2 further discloses the structure of the above-mentioned reflective sheet 10, comprising a light reflecting layer 12 and a reinforcing layer 14. The reflective layer 12 is made of a plastic material (Thermoplastic) and further doped with at least one kind of reflective medium Ua. The plastic material such as polyethylene terephthalate (PET) or polypropylene (Polypropylene, PP), Polycarbonate (PC), Polystyrene (PS) or Aurylonitrile - Butadene _ Styrene (ABS), but The reflective medium 12a is preferably selected from a silver material or titanium dioxide. Similarly, the material of the reflective medium 12a is not limited to the above. As for the reinforcing layer 14, which is located below the light reflecting layer 12 and contains the stray fiber material 14a' having a stable light reflecting layer 12 structure to avoid deformation due to heat, and to improve the tensile deformation resistance of the reflecting sheet 10. Since the reflective layer 12 of the reflective sheet 10 is in close proximity to the light guide plate 40, when the light 201211637 enters the reflective layer 12 and encounters the reflective medium 12a, multiple refraction phenomena will occur, thereby increasing the reflection capability and increasing the backlight. Module 1 is the purpose of projecting the amount of light. Secondly, since the reflective medium 12a is directly incorporated into the plastic material constituting the light reflecting layer 12 during the manufacturing process of the reflective sheet 1 , the structure of the present invention has a simplified process as compared with the surface of the general reflective sheet and then coated with the metal thin film. effect. Further, in the bottom surface of the light-reflecting layer 12 of the reflection sheet 1 of the present invention, since the reinforcing layer 14 mainly composed of the staple fiber material 14a is provided, the crucible is not easily deformed. Referring to FIG. 3 again, in another preferred embodiment of the reflective sheet of the present invention, the reflective sheet 70 of the present embodiment has not only the reflective layer 72 and the reinforcing layer 74 but also the reinforcing layer 74. There is disposed a thermal conductive layer 76, which is also made of a plastic material such as polyethylene terephthalate (PET) or polypropylene (PP), and is further doped with a heat conductive medium 76a. The dielectric material 76a is exemplified by metal powder or ceramic powder, but is not limited thereto. Since the heat conducting layer 76 of the assembled reflective sheet 70 is adhered to the metal back frame 3, the thermal energy accompanying the light entering the reflecting sheet 70 can be efficiently conducted to the metal back frame 30 to lower the reflecting sheet 70. A situation in which the quality changes due to long-term heat. 4 and FIG. 5 are still another preferred embodiment of the present invention, which discloses a plastic frame 20 having a material property similar to that of the reflective sheet 10 (or the reflective sheet 70) through a joining technique " The sheet 10 (or the reflection sheet 70) is integrally connected. This structure ensures that the backlight module has a reflective structure, and the absence of the conventional backlight module may result in the loss of the missing reflector due to the loss. The aforementioned link 201211637 technology includes hot pressing, gluing or bonding. The above description is only for the preferred embodiments of the present invention, and the equivalent structures and manufacturing methods of the present invention and the scope of the patent application are intended to be included in the scope of the present invention. 201211637 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a preferred embodiment of the present invention. Figure 2 is a cross-sectional view showing a reflection sheet of the above preferred embodiment of the present invention. Figure 3 is a cross-sectional view of a reflective sheet in accordance with another preferred embodiment of the present invention. 4 is a schematic view showing the connection of a reflective sheet and a plastic frame according to still another preferred embodiment of the present invention. Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4; [Main component symbol description] 100 backlight module 10 reflective sheet 12 reflective layer 12a reflective medium 14 reinforcing layer 14a short fiber material 20 plastic frame 30 metal back frame 40 light guide plate 50 optical film 60 light emitting diode 70 reflection sheet 72 reflective Layer 74 strengthening layer 76 heat conducting layer 76a heat conducting medium