200811529 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種背光模組，尤其係指一種用於背 光模組之反射片。 【先前技術】 为光模組作為液晶顯示器所需的平面光源，對於其發 光儿度及毛光均勻性皆有嚴格的要求，以確保液晶顯示器 所顯示之影像品質。 如圖1與圖2所示，習知之側光式背光模組1〇〇在導 光板11相反的兩側面lu上設置有二冷陰極螢光燈管12, 。亥等k f 12所务出的光線經由兩側面丨丨1入射於該導光板 11後，藉由設置於導光板u底部之反射單體（圖未示）以及 設置於導光板11與背板13之間的反射片14的反射，朝向 月光杈組100之出光方向（如圖中所示箭頭方向）射出。 此外，為了要提昇光線使周效率來增加整體背光模組 之冗度，會在導光板1丨另外兩個未設置冷陰極螢光燈 管12的側Φ 112上以雙面膠作為黏著劑黏設側反射片15。 側反射片15的形狀疋對應於導光板丨丨之側面112形狀，且 其面積略小於導光板u之側面112的面積以便於組裝，此 卻容易造成些許之漏光。#者，冑面膠會吸&光線且在人 工貼附時容易造成雙面膠移轉而污染導光板i丨，以致影響 月光杈組之光線品質。而且，由於側反射片15需單獨加以 製作，因此其成本較高。 100’係採用一體成型 如圖3所示，另一習知背光模組 5 200811529 之反射# 2卜首先，㉟一完整的反射Μ 21之兩側邊之彎折 處設置齊縫線’再以管折方式形成一主反射部211及由主反 射部211相反兩側垂直向上延伸出的二側反射部2丨2。此種 方式雖可有效解決前述之缺點，但由於導光板11與反射片 /之材貝不同，當處於高溫高濕環境時，導光板丨i的膨脹 :數較反射片21大，而容易使反射片21其彎折處之齊縫線 遭受導光板11擠壓而產生斷裂，而造成些許之漏光。 【發明内容】 本發明之目的，在提供一種可以解決受高溫高濕膨脹 所致之斷裂問題並可提升光線使用效率之反射片及具有該 反射片之背光模組。 本發明用於背光模組之反射片包含一主反射部、二傾 斜反射部及二側反射部；其中主反射部具有一相對於導光 板之底面的主反射面，且主反射面之形狀對應於導光板之 底面的形狀；二傾斜反射部由主反射部之鄰近於導光板之 二側面的二側邊向外且向出光方向傾斜延伸；二側反射部 分別由該等傾斜反射部之遠離該主反射部的側邊朝出光方 向延伸，各側反射部具有一相對於該導光板之側面的側反 射面且側反射面之形狀對應於該導光板之側面的形狀。藉 由在反射片t主反射部與側反射部之間形成之傾斜反射部 ’可作為當導光板受高溫高濕膨脹時之緩衝區，防止側反 射部直接遭受導光板擠壓斷裂而影響光學品質。 本發明用於背光模組之另一實施例之反射片包含一主 反射部及二側反射部；#中主反射部具有—形狀對應於導 6 200811529 光板之底面的主反射面，且主反射面之形狀對應於導光板 之底面的形狀；二側反射部分別由主反射部的二側邊朝出 光方向延伸，各側反射部具有一相對於導光板之側面的側 反射面且側反射面之形狀對應於導光板之側面的形狀；其 中，沿主反射部之二側邊，該主反射部與該等側反射部之 間分別部分貫穿形成至少一分離段，其餘未貫穿部分則形 成至少一連結段；並且沿主反射部之其中一側邊之分離段 對應於沿主反射部之另一側邊之連結段。藉由在主反射部 之兩側邊分別設置分離段，可使得導光板在受高溫高濕膨 脹時，可從分離段處推擠側反射部向外移動，以避免主反 射部與側反射部之間產生不規則斷裂而影響光學品質。 【實施方式】 ' 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之三個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 /閱圖4及圖5，本發明第一較佳實施例之背光模組^ 包含-背板3、一導光板4’以及一光源及反射片 —其中，背板3形成一用於容置導光板4、冷陰極螢光燈 管5以及反射片6等構件之凹槽31。 導光板4 $一具有高穿透率材質所製成之矩形平板， 矩^的面積大小對應於所應用之液晶顯示面板之尺寸大小 ‘光板4包括一出光面41、—相反於出光面^之底面 7 200811529 42、二分別鄰接於底面42相反兩側之第-側面43、44及 二分別鄰接於底面42另—相反兩側之第二㈣。光 源(圖未示)係鄰近至少—第一側面43、44設置，本實施例 中是採用二冷陰極螢光燈管5作為背光模組之光源，且二200811529 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module, and more particularly to a reflective sheet for a backlight module. [Prior Art] As a planar light source required for a liquid crystal display, an optical module has strict requirements for its illuminance and uniformity of hair to ensure the image quality displayed by the liquid crystal display. As shown in FIG. 1 and FIG. 2, the conventional side-lit backlight module 1 is provided with two cold cathode fluorescent tubes 12 on opposite sides lu of the light guide plate 11. After being incident on the light guide plate 11 through the two side faces 丨丨1, the light emitted by the kf 12 is disposed on the bottom of the light guide plate u (not shown) and on the light guide plate 11 and the back plate 13 The reflection between the reflective sheets 14 is emitted toward the light exiting direction of the moonlight stack 100 (in the direction of the arrow shown in the figure). In addition, in order to increase the light efficiency and increase the redundancy of the overall backlight module, the double-sided adhesive is adhered to the side Φ 112 of the light guide plate 1 and the other two cold cathode fluorescent tubes 12 are not disposed. A side reflection sheet 15 is provided. The shape of the side reflection sheet 15 corresponds to the shape of the side surface 112 of the light guide plate, and its area is slightly smaller than the area of the side surface 112 of the light guide plate u to facilitate assembly, which is liable to cause some light leakage. #者,胄面胶 will absorb & light and it will easily cause the double-sided adhesive to transfer and contaminate the light guide plate when it is attached, which will affect the light quality of the moonlight group. Moreover, since the side reflection sheet 15 needs to be separately fabricated, the cost is high. The 100' system is integrally formed as shown in Fig. 3. Another conventional backlight module 5 200811529 reflection # 2 Bu first, 35 a complete reflection Μ 21 on both sides of the bend at the side of the seam line ' The tube folding method forms a main reflection portion 211 and two side reflection portions 2丨2 extending vertically upward from opposite sides of the main reflection portion 211. Although the above-mentioned shortcomings can effectively solve the above-mentioned shortcomings, since the light guide plate 11 is different from the reflective sheet/material, when the light is in a high temperature and high humidity environment, the expansion of the light guide plate 丨i is larger than the reflection sheet 21, and it is easy to make The stitching line of the reflection sheet 21 at the bending portion is crushed by the light guide plate 11 to cause breakage, and causes some light leakage. SUMMARY OF THE INVENTION An object of the present invention is to provide a reflection sheet which can solve the problem of fracture caused by high temperature and high humidity expansion and can improve light use efficiency, and a backlight module having the same. The reflective sheet for the backlight module of the present invention comprises a main reflection portion, two inclined reflection portions and two side reflection portions; wherein the main reflection portion has a main reflection surface with respect to the bottom surface of the light guide plate, and the shape of the main reflection surface corresponds to The shape of the bottom surface of the light guide plate; the two inclined reflection portions are outwardly inclined from the two side edges of the main reflection portion adjacent to the two side surfaces of the light guide plate and extend obliquely toward the light exiting direction; the two side reflection portions are respectively separated from the inclined reflection portions The side of the main reflection portion extends in the light-emitting direction, and each of the side reflection portions has a side reflection surface with respect to the side surface of the light guide plate, and the shape of the side reflection surface corresponds to the shape of the side surface of the light guide plate. The inclined reflection portion ' formed between the main reflection portion and the side reflection portion of the reflection sheet t can be used as a buffer when the light guide plate is expanded by high temperature and high humidity, and the side reflection portion is prevented from directly suffering from the light breakage of the light guide plate to affect the optical quality. The reflective sheet of the other embodiment of the present invention includes a main reflection portion and two side reflection portions. The main reflection portion of the main reflection portion has a shape corresponding to the main reflection surface of the bottom surface of the light guide plate of the 200811529, and the main reflection portion The shape of the surface corresponds to the shape of the bottom surface of the light guide plate; the two side reflection portions respectively extend from the two sides of the main reflection portion toward the light exit direction, and each of the side reflection portions has a side reflection surface with respect to the side surface of the light guide plate and the side reflection surface The shape corresponds to the shape of the side surface of the light guide plate; wherein, along the two sides of the main reflection portion, the main reflection portion and the side reflection portions are partially penetrated to form at least one separation portion, and the remaining non-penetration portions are formed at least a joining section; and the separating section along one side of the main reflecting portion corresponds to the joining section along the other side of the main reflecting portion. By providing separate separation sections on both sides of the main reflection portion, the light guide plate can be moved outward from the separation side by the push side reflection portion when being exposed to high temperature and high humidity to avoid the main reflection portion and the side reflection portion. Irregular breaks occur to affect optical quality. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the preferred embodiments. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. 4 and FIG. 5, the backlight module of the first preferred embodiment of the present invention includes a backplane 3, a light guide 4', and a light source and a reflection sheet, wherein the back panel 3 is formed for receiving A groove 31 of a member such as the light guide plate 4, the cold cathode fluorescent lamp tube 5, and the reflection sheet 6. The light guide plate 4 is a rectangular flat plate made of a material having a high transmittance, and the area of the cavity corresponds to the size of the liquid crystal display panel to be applied. The light plate 4 includes a light exit surface 41, which is opposite to the light exit surface. The bottom surface 7 200811529 42 and the second side surfaces 43 , 44 and 2 respectively adjacent to opposite sides of the bottom surface 42 are respectively adjacent to the second (four) of the bottom surface 42 and the opposite sides. The light source (not shown) is disposed adjacent to at least the first side surfaces 43, 44. In this embodiment, the two cold cathode fluorescent tubes 5 are used as the light source of the backlight module, and
冷陰極螢紐管5相對於導光板4之相反的兩第—側面C 、44设置。而在實際應用時，亦可採用發光二極體作為背 光模組之光源。 此外，為了使冷陰極螢光燈管5所發出之光線可實質 上朝出光方向（如圖中箭頭方向所示）反射，導光板4之底面 42上更形成有複數反射單體（圖未示），此等反射單體可以是 利用網版印刷所形成的油墨㈣點，亦可以是利用微⑽ 刻製程在底面42上所形成的凸點。 135度 反射片6設於背板3與導光板4之間，反射片6可為 -薄平板並可由«或金屬材質所製成。$ 了要提高光線 使用率，減少反射片6漏光所造成的光線損失。將反射片6 配合導光板4之形狀來作設計，在本實施例中，反射片6 係採用一平面矩形板材經由沖折製程所形成。且反射片6 包含一主反射部61、二傾斜反射部62，以及二側反射部63 。主反射部6丨具有一相對於導光板4之底面42的主反射 面611 ’且主反射面611之形狀對應於導光板4之底面42 的形狀。在導光板4未设置有冷陰極榮光燈管之二第一側 面45、46處，反射片6由主反射部61之二相反之側邊612 各自向外且向出光方向傾斜延伸出傾斜反射部62,較佳地 ，傾斜反射部62與主反射部61之間所夹之角度為 8 200811529 角。 丨只久射邵 的側邊㈣出光方向延伸，侧反射= 離主反射部。 光板4未設置有冷陰極榮光燈管之二〜有-相對於導 側反射面631，並且側反射面6 —f —^面45 ;46，的 :第二側面45、46的形狀。各該例反射::應:導::4The cold cathode fluorescent tube 5 is disposed opposite to the opposite first side faces C, 44 of the light guide plate 4. In practical applications, a light-emitting diode can also be used as a light source for the backlight module. In addition, in order to make the light emitted by the cold cathode fluorescent lamp 5 substantially reflected in the light outgoing direction (as indicated by the direction of the arrow in the figure), the bottom surface 42 of the light guide plate 4 is further formed with a plurality of reflective monomers (not shown). The reflective monomer may be an ink (four) dot formed by screen printing, or may be a bump formed on the bottom surface 42 by a micro (10) etching process. The 135 degree reflection sheet 6 is disposed between the back sheet 3 and the light guide plate 4, and the reflection sheet 6 may be a thin flat plate and may be made of «or metal material. It is necessary to increase the light utilization rate and reduce the light loss caused by the light leakage of the reflection sheet 6. The reflection sheet 6 is designed to match the shape of the light guide plate 4. In the embodiment, the reflection sheet 6 is formed by a punching process using a flat rectangular plate. The reflection sheet 6 includes a main reflection portion 61, two inclined reflection portions 62, and two side reflection portions 63. The main reflection portion 6A has a main reflection surface 611' with respect to the bottom surface 42 of the light guide plate 4, and the shape of the main reflection surface 611 corresponds to the shape of the bottom surface 42 of the light guide plate 4. Where the light guide plate 4 is not provided with the first side faces 45, 46 of the cold cathode glory tube, the reflective sheet 6 is inclined outwardly from the opposite side 612 of the main reflection portion 61 and extends obliquely toward the light exiting direction. 62. Preferably, the angle between the inclined reflecting portion 62 and the main reflecting portion 61 is 8 200811529 angle.丨 Only a long time to shoot the side of the Shao (4) extending in the direction of light, side reflection = away from the main reflection. The light plate 4 is not provided with the shape of the second side faces 45, 46 of the cold cathode glory tube 2 - with respect to the side reflection surface 631 and the side reflection surface 6 - f - surface 45; Each case of reflection:: should: guide:: 4
Si伸長度小於導光板4之第二側面“沿:二 猎由在主反射部61與側反射部〇之間形 :3的：當導光板…溫高濕膨 ^3光::=區，防止反射“遭受導光板4擠_裂而 參閱圖6及圖7，為本發明笛— 不&月弟一較佳貫施例之背光模組 ，人弟一較佳實施例不同之處在於，反射片7包含一主反 射1 71 M及—側久射部72。主反射部71具有-相對於導 光板4之底面42的主反射面7"，且主反射面川之形狀 對應於導光板4之底面42的職。側反射部72分別由主 反射部71力二相反的側邊73朝出光方向垂直延伸，側反 射4 72具有一相對於導光板4之第二側自、μ的側反 射面721且側反射面721之形狀對應於導光板4之側面45 46的形狀。其中，沿主反射部7丨之二側邊73，主反射 邛71與側反射部72之間分別部分貫穿形成一分離段（實線 邛刀）73 1，其餘未貫穿部分則形成一連結段（虛線部分）732 其中一側邊73之分離段73 1橫向對應相反的另一側邊73 9 200811529 之連結段732,且分離段731的長度係大於或等於對應之連 結段732的長度。 換句活s兒，反射片7之主反射部71與側反射部之 間，僅在分別位於主反射部7丨之兩側邊乃之連結段732 是相連的。藉由在主反射部71之兩側邊73分別設置分離 段73卜可使得導光板4在膨脹時，可分別如圖7中箭頭所 示方向，從分離段73i處推擠側反射部72向外移動，以避 免主反射部71與側反射部72之間產生之不規則斷裂。 襄造時，主反射部71 舄說明的是，在反射片 與側反㈣72之間並非是呈現垂直狀態，W呈現水^平狀 態’如此可便於將反船疊合運送。而當將反射片7裝 ::背光模組時’才將側反射部72向出光方向垂直彎折而 成為使用時之形狀。 …局“更於沿著主反射部71之側邊 Γ部72，更在各該連結段扣上設置齊縫線，即部分貫 牙形成複數子分離段7321，其餘未貫穿部分則形成複數子 連結段7322。相似地，哕笠工」小戚稷數子 而為交錯地設置。4子分離段732丨與該等子連結段 =圖:’本發明第三較佳實施例之背光模 -較佳η例不同之處在於，沿主反射部71之二側邊= 主反射部71與側反射部7 ⑶以及複數個連Μ μ 1各卿切複數個分離段 連、、“又732。其中，沿任-側邊73… 等分離段⑶與料連結段732並呈現交錯 ’该 並且’沿主反射部71之其中一側…分離段73] 10 200811529 73之 1=:::對應之…射…另-側邊 使得導光板4在膨脹時，可分別如圖8中箭 向’從分離段731處推擠側反射部72向外移動：方 反射部與側反射部72之間產生不規則斷裂。 免主 惟以上所述者，僅為本發明之較佳實施例而已，a ，以此限定本發明實施之範圍，即大凡依本發明中請= 乾圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是習知背光模組之示意圖； 圖2是習知背光模組之側視示意圖； 圖3疋習知背光模組之局部示意圖； 圖4疋本發明第一較佳實施例之背光模組的立體分解 圖； 圖5是圖4所示之背光模組之側視示意圖； 圖6是本發明第二較佳實施例之背光模組的立體分解 圖7是圖6所示之反射片之立體示意圖；及 圖8是本發明第三較佳實施例之反射片之立體示意圖 11 200811529 【主要元件符號說明】 1 ···· ......背光模組 621 ·… …側邊 1，… ......背光模組 63…… ••…側反射部 3 ···· ……背板 631 ···· .....側反射面 31··· ……凹槽 7 ....... ••…反射片 • 4 ··_· ……導光板 71…… …·· ·主反射部 41… ......出光面 711 ···· ••…主反射面 42··· ......底® 72…… ••…側反射部 43〜 4 6 · ·側面 721 ···· .....側反射面 5 ···· ……冷陰極螢光燈管 73…… ……側邊 6 ···· ……反射片 731 ···· ••…分離段 61… ……主反射部 732 ···· •…·連結段 611 · ......主反射面 7321··· ••…子分離段 612 · • ·—側邊 7322··· ••…子連結段 62··· ……傾斜反射部 12The elongation of Si is smaller than the second side of the light guide plate 4. [Y: The second hunting is formed between the main reflection portion 61 and the side reflection portion :: 3: when the light guide plate...the temperature is high and the humidity is 3, the light is: Anti-reflection "Breaking the light guide plate 4 and smashing and referring to FIG. 6 and FIG. 7 is a backlight module of a preferred embodiment of the present invention, which is different from the preferred embodiment of the present invention. The reflection sheet 7 includes a main reflection 1 71 M and a side long-range portion 72. The main reflection portion 71 has a main reflection surface 7" with respect to the bottom surface 42 of the light guide plate 4, and the shape of the main reflection surface corresponds to the bottom surface 42 of the light guide plate 4. The side reflection portions 72 respectively extend perpendicularly from the opposite side 73 of the main reflection portion 71 toward the light exit direction, and the side reflections 4 72 have a side reflection surface 721 opposite to the second side of the light guide plate 4 and the side reflection surface. The shape of 721 corresponds to the shape of the side surface 45 46 of the light guide plate 4. Wherein, along the two side edges 73 of the main reflection portion 7丨, a separation section (solid line trowel) 73 is partially formed between the main reflection 邛 71 and the side reflection portion 72, respectively, and the remaining non-penetrating portion forms a joint section. (dashed line portion) 732 wherein the separation section 73 1 of one side edge 73 corresponds laterally to the junction section 732 of the opposite side edge 73 9 200811529, and the length of the separation section 731 is greater than or equal to the length of the corresponding joint section 732. In other words, the main reflection portion 71 of the reflection sheet 7 and the side reflection portion are connected only to the joint portion 732 which is located on both sides of the main reflection portion 7A. By providing the separation sections 73 on the side edges 73 of the main reflection portions 71, respectively, when the light guide plate 4 is expanded, the side reflection portions 72 can be pushed from the separation portion 73i in the direction indicated by the arrow in FIG. 7, respectively. The outer movement is performed to avoid irregular breakage between the main reflection portion 71 and the side reflection portion 72. At the time of manufacture, the main reflection portion 71 舄 illustrates that the vertical state is not present between the reflection sheet and the side opposite (four) 72, and the water is in a flat state. This facilitates the transport of the anti-ship superimposed. On the other hand, when the reflection sheet 7 is mounted with a backlight module, the side reflection portion 72 is bent vertically in the light-emitting direction to have a shape at the time of use. The "station" is further along the side crotch portion 72 of the main reflection portion 71, and a stitch line is provided on each of the joint segments, that is, the partial teeth form a plurality of sub-separation segments 7321, and the remaining non-penetrating portions form a plurality of sub-segments The link segment 7322 is similarly arranged to be interleaved. 4 sub-separation section 732 丨 and the sub-joining section=Fig.: The backlight mode of the third preferred embodiment of the present invention is different from the preferred η example in that the two sides along the main reflection portion 71 = the main reflection portion 71 is connected to the side reflection portion 7 (3) and the plurality of links Μ μ 1 each of the plurality of separation segments, and "again 732. Among them, the separation portion (3) and the material connection portion 732 are interlaced along the any-side 73... And "on one side of the main reflection portion 71 ... separation section 73] 10 200811529 73 of 1 =::: corresponding to ... shot ... the other side of the light guide plate 4 when expanding, respectively, as shown in Figure 8 Moving outward from the pushing side reflecting portion 72 from the separating section 731: an irregular break occurs between the square reflecting portion and the side reflecting portion 72. The above is only the preferred embodiment of the present invention. And a, so as to limit the scope of the implementation of the present invention, that is, the simple equivalent changes and modifications made by the present invention in the context of the invention and the description of the invention are still within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional backlight module; FIG. 2 is a side view of a conventional backlight module FIG. 3 is a partial exploded view of a backlight module according to a first preferred embodiment of the present invention; FIG. 5 is a side elevational view of the backlight module shown in FIG. 6 is a perspective exploded view of a backlight module according to a second preferred embodiment of the present invention; FIG. 7 is a perspective view of the reflective sheet shown in FIG. 6; and FIG. 8 is a perspective view of a reflective sheet according to a third preferred embodiment of the present invention. 200811529 [Description of main component symbols] 1 ····......Backlight module 621 ·...Side side 1,.........Backlight module 63... ••...Side reflection part 3 · ··· ...... Backplane 631 ···· ..... Side reflection surface 31···...... Groove 7 ....... ••...Reflective sheet • 4 ··_· ...... Light plate 71.........······································································· Side reflection parts 43 to 4 6 · Side surface 721 ······. Side reflection surface 5 ····...Cold cathode fluorescent tube 73............Side side 6···· ...... Reflecting sheet 731 ····••...Separating section 61... Main reflection portion 732 ·······connection segment 611 ·...main reflection surface 7321··· ••...sub-separation section 612 · • ·-side side 7322··· ••...sub-link Segment 62··· ... tilting reflection portion 12