1295399 -九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種背光模組，尤其係指一種用於背 光模組之反射片。 【先前技術】 背光模組作為液晶顯示器所需的平面光源，對於其發 光免度及發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U1上設置有二冷陰極螢光燈管12， 該等燈管12所發出的光線經由兩側面丨丨丨入射於該導光板 11後，藉由設置於導光板11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 背光模組100之出光方向（如圖中所示箭頭方向）射出。 此外’為了要提昇光線使用效率來增加整體背光模組 100之冗度’會在導光板11另外兩個未設置冷陰極螢光燈 官12的側面112上以雙面膠作為黏著劑黏設側反射片15。 側反射片15的形狀是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U2的面積以便於組裝，此 卻容易造成些許之漏光。再者，雙面膠會吸收光線且在人 工貼附時容易造成雙面膠移轉而污染導光板n，以致影響 背光模組之光線品質。而且，由於側反射片15需單獨加以 製作，因此其成本較高。 如圖3所示’另一習知背光模組1〇〇，係採用一體成型 1295399 之反射片21首先’將_完整的反射片2 ^之兩側邊之彎折 處設置齊縫線，再以彎折方式形成一主反射部2ΐι及由主反 射4 211相反兩側垂直向上延伸出的二側反射部212。此種 方式雖可有效解決前述之缺點，但由於導光板u與反射片 21之材^不同m高溫高濕環境時，導光板n的膨服 係數較反射片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温高濕膨服 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_主反射部、：傾 斜反射部及三側反射部；其巾主反射部具有—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 由在反射片之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；其中主反射部具有一形狀對應於導 1295399 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 脹日τ，可攸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。 麥閱圖4及圖5，本發明第一較佳實施例之背光模組j 包含一背板3、一導光板4，以及一光源及反射片6。 其中，背板3形成一用於容置導光板4、冷陰極螢光燈 S 5以及反射片6等構件之凹槽31。 導光板4為一具有高穿透率材質所製成之矩形平板， 矩形的面積大小對應於所應用之液晶顯示面板之尺寸大小 。導光板4包括一出光面41、一相反於出光面41之底面 1295399 42、二分別鄰接於底面42相反兩側之第一側面43、44及 二分別鄰接於底面42另一相反兩側之第二側面45、46。光 源（圖未示）係鄰近至少一第一側面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 冷陰極螢光燈管5相對於導光板4之相反的兩第一側面43 、44設置。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（ink)點，亦可以是利用微影蝕 刻製程在底面42上所形成的凸點。 反射片6設於背板3與導光板4之間，反射片6可為 一薄平板並可由塑膠或金屬材質所製成。為了要提高光線 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61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u 的形狀。在導光板4未設置有冷陰極螢光燈管之二第二側 面45、46處，反射片6由主反射部61之二相反之側邊Μ〕 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之間所夾之角度為135度 1295399 角。 側反射部63分料傾斜反射部62 的側邊021朝出井方& % μ 疋離主反射邛61 旱月出忐方向延伸，側反射部幻具 先板4未設置有冷陰極螢光燈 、 / » 乐 _ 侦J 面 45、46， 側反射面631，並且側反射面 之箆He 之形狀疋對應於導光板4 的形狀。各該側反射…出光方向 =伸長度小於導光板4之第二側面“沿出光方向的 藉由在主反射部61與側反射部63之間形成之傾斜反 〇 ，可作為當導歧4受高溫高濕膨脹而擠塵側反射 =3時的緩衝區，防止反射片6遭受導光板4擠壓斷裂而 影響光學品質。 參閱圖6及圖7,為本發明第二較佳實施例之背光模组 1’，與第-較佳實施例不同之處在於，反射片7包含一主反 射部以及二側反射部72。主反射部71具有一相對於導 光板4之底面42的主反射面川，且主反射面7ΐι之形狀 對應於導光板4之底面42的形狀。側反射部72分別由主 反射部71的二相反的側邊73朝出光方向垂直延伸，側反 射部72具有—相對於導光板4之第二側面45、46的側反 射面72丨且側反射面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71之二側邊73，主反射 部71與側反射部72之間分別部分貫穿形成—分離段（實線 邰/刀）731，其餘未貫穿部分則形成—連結段（虛線部分）732 。其中一側邊73之分離段731橫向對應相反的另一側邊73 1295399 之連結段732，且分離段731 結段7 3 2的長度。 的長度係大於或等於對應之連1295399 - 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, the backlight module has strict requirements for its illuminance and uniformity of illumination 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 the opposite sides U1 of the light guide plate 11, and the light emitted by the tubes 12 After being incident on the light guide plate 11 via the two side faces, the reflection unit (not shown) disposed at the bottom of the light guide plate 11 and the reflection of the reflection sheet 14 disposed between the light guide plate 11 and the back plate 13 are The light exiting direction of the backlight module 100 (in the direction of the arrow shown in the figure) is emitted. In addition, in order to increase the light use efficiency to increase the redundancy of the overall backlight module 100, the double-sided adhesive is used as the adhesive side on the other two side surfaces 112 of the light guide plate 11 where the cold cathode fluorescent lamp 12 is not disposed. Reflecting sheet 15. The shape of the side reflection sheet 15 is a shape corresponding to the side surface 112 of the light guide plate, and its area is slightly smaller than the area of the side surface U2 of the light guide plate u to facilitate assembly, which is liable to cause some light leakage. Moreover, the double-sided tape absorbs light and easily causes the double-sided tape to migrate and contaminate the light guide plate n when it is attached by humans, thereby affecting the light quality of the backlight module. Moreover, since the side reflection sheet 15 needs to be separately fabricated, the cost is high. As shown in FIG. 3, another conventional backlight module 1 is formed by integrally forming a reflection sheet 21 of 1295399, and firstly setting a seam of the two sides of the _ complete reflection sheet 2 ^, and then stitching the seam. A main reflection portion 2ΐ and a two-side reflection portion 212 extending vertically upward from opposite sides of the main reflection 4 211 are formed in a bent manner. Although the above-mentioned shortcomings can be effectively solved in this manner, when the light guide plate u and the reflective sheet 21 are different in the high temperature and high humidity environment, the expansion coefficient of the light guide plate n is larger than that of the reflective sheet 21, and the reflective sheet 21 is easily made. The seam line at the bend is crushed by the light guide plate 11 to cause breakage, causing 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 a backlight module of the present invention comprises a main reflection portion, an inclined reflection portion and a three-side reflection portion; the main reflection portion of the towel has a main reflection surface with respect to a bottom surface of the light guide plate, and a shape of the main reflection surface Corresponding 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 obliquely toward the light exit direction; the two side reflection portions are respectively formed by the oblique reflection portions The side away from the main reflection portion extends in the light-emitting direction, and each side reflection portion 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 oblique reflection portion formed between the main reflection portion and the side reflection portion of the reflection sheet 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 directly prevented from being crushed and broken by the light guide plate to affect the optical quality. The reflective sheet of another embodiment of the present invention includes a main reflection portion and two side reflection portions; wherein the main reflection portion has a main reflection surface having a shape corresponding to the bottom surface of the light guide plate of the 1295399, and the main reflection surface The shape 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 side reflection portion has a side reflection surface with respect to the side surface of the light guide plate and the shape of the side reflection surface Corresponding 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 form at least one connection And a separation section along one side of the main reflection portion corresponds to a joint section along the other side of the main reflection portion. By providing separate separation sections on both sides of the main reflection portion, the light guide plate can be moved outward by the push side reflection portion at the high temperature and high humidity expansion day τ, so as to avoid the main reflection portion and the side reflection. Irregular breaks between the parts affect the 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 drawings. 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 j of the first preferred embodiment of the present invention comprises a back plate 3, a light guide plate 4, and a light source and a reflection sheet 6. The back plate 3 defines a recess 31 for accommodating members such as the light guide plate 4, the cold cathode fluorescent lamp S 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 size of the rectangular area corresponds to the size of the liquid crystal display panel to be applied. The light guide plate 4 includes a light exit surface 41, a bottom surface 1295399 42 opposite to the light exit surface 41, two first side surfaces 43, 44 adjacent to opposite sides of the bottom surface 42, and two opposite sides of the bottom surface 42 respectively. Two sides 45, 46. A light source (not shown) is disposed adjacent to the at least one first side surface 43, 44. In this embodiment, two cold cathode fluorescent tubes 5 are used as the light source of the backlight module, and the two cold cathode fluorescent tubes 5 are opposite to each other. The opposite first side faces 43, 44 of the light guide plate 4 are disposed. 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 monomers may be ink dots formed by screen printing, or may be bumps formed on the bottom surface 42 by a photolithography process. The reflective sheet 6 is disposed between the back sheet 3 and the light guide plate 4. The reflective sheet 6 can be a thin flat plate and can be made of plastic or metal. In order to increase the light utilization rate, the light loss caused by the light leakage of the reflection sheet 6 is reduced. 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 61 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 u of the light guide plate 4. Where the light guide plate 4 is not provided with the second side faces 45, 46 of the cold cathode fluorescent lamp tube, the reflection sheet 6 is opposite to the side of the light exiting direction by the opposite side edges of the main reflection portion 61. Preferably, the angle of the reflection portion 62 between the inclined reflection portion 62 and the main reflection portion 61 is 135 degrees 1295399. The side reflection portion 63 of the side reflection portion 63 is divided toward the well side & % μ 疋 away from the main reflection 邛 61 in the direction of the dry moon exit, and the side reflection portion illusion plate 4 is not provided with the cold cathode fluorescent lamp / / » Le _ _ J face 45, 46, side reflection surface 631, and the shape 疋 of the side reflection surface 疋 He corresponds to the shape of the light guide plate 4. Each of the side reflections...light exit direction=elongation is smaller than the second side surface of the light guide plate 4. The inclined ridge formed between the main reflection portion 61 and the side reflection portion 63 along the light exit direction can be used as the guide 4 The high-temperature and high-humidity expansion and the buffer side of the dust-side reflection=3 prevent the reflection sheet 6 from being crushed and broken by the light guide plate 4 to affect the optical quality. Referring to FIG. 6 and FIG. 7, the backlight of the second preferred embodiment of the present invention is used. The module 1' is different from the first embodiment in that the reflection sheet 7 includes a main reflection portion and two side reflection portions 72. The main reflection portion 71 has a main reflection surface with respect to the bottom surface 42 of the light guide plate 4. The shape of the main reflecting surface 7ΐ corresponds to the shape of the bottom surface 42 of the light guide plate 4. The side reflecting portions 72 extend perpendicularly from the opposite side edges 73 of the main reflecting portion 71 toward the light emitting direction, and the side reflecting portions 72 have a relative The shape of the side reflecting surface 72 of the second side faces 45, 46 of the light guide plate 4 and the shape of the side reflecting surface 721 corresponds to the shape of the side faces 45, 46 of the light guide plate 4. Among them, along the two side edges 73 of the main reflecting portion 71, Partial penetration between the main reflection portion 71 and the side reflection portion 72 The segment (solid wire/knife) 731, the remaining non-penetrating portion forms a joining segment (dashed portion) 732. The separating segment 731 of one side edge 73 corresponds laterally to the connecting segment 732 of the opposite other side edge 73 1295399, And the length of the segment 731, the length of the segment 7 3 2 , is greater than or equal to the corresponding link
換句話說，反射片7之主反射部71與側反射部μ之 間，僅在分別位於主反射部71之兩側邊73之連結段Μ] 是相連的。藉由在主反射部71之兩側邊73分別設=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731處推擠側反射部72向外移動則=避 免主反射部71與側反射部72之間產生之不規則斷裂。、 此外，需說明的是，在反射片7製造時，主反射部Μ 與側反射部72之間並非是呈現垂直狀態，而是呈現水°平狀 態’如此可便於將反射片7疊合運送。而當將反射# 了裝 設於背光模組時，才將側反射部72向出光方向垂直彎折; 成為使用時之形狀。 因此，為了便於沿著主反射部71之侧邊73來彎折側 反射部72,更在各該連結段732上設置齊縫線，即部分貫 穿形成複數子分㈣7321，纟餘未貫穿部分則形成複數子 連結段7322。相似地，該等子分離段7321與該等子連結段 7322為交錯地設置。 參閱圖8，本發明第三較佳實施例之背光模組，其與第 二較佳實施例不同之處在於，沿主反射部71之二側邊乃， 主反射部71與側反射部72之間各別形成有複數個分離段 731以及被數個連結段732。其中，沿任一側邊73上，該 等分離段731與該等連結段732並呈現交錯地設置。 並且，沿主反射部71之其中一側邊73之分離段731 10 1295399 的長度係大於等於對應之沿主反射部 連結段732的長度。 淮、上所述者，僅為本發明之較佳實施例而已， 能以此限定本發明實施之範圍，即大凡依本發明申請=In other words, between the main reflection portion 71 of the reflection sheet 7 and the side reflection portion μ, only the connection portions Μ] respectively located at the side edges 73 of the main reflection portion 71 are connected. By providing the = separating section 73 at the both side edges 73 of the main reflecting portion 71, respectively, when the light guiding plate 4 is expanded, the side reflecting portion 72 can be pushed from the separating portion 731 in the direction indicated by the arrow in FIG. 7, respectively. Moving outward = avoiding irregular breakage between the main reflection portion 71 and the side reflection portion 72. In addition, it is to be noted that, when the reflection sheet 7 is manufactured, the main reflection portion Μ and the side reflection portion 72 are not in a vertical state but in a water level state, so that the reflection sheet 7 can be easily conveyed and conveyed. . When the reflection # is mounted on the backlight module, the side reflection portion 72 is bent vertically in the light-emitting direction; the shape is used. Therefore, in order to facilitate the bending of the side reflection portion 72 along the side edge 73 of the main reflection portion 71, a seam line is provided on each of the connection portions 732, that is, a plurality of sub-segments (four) 7321 are partially formed, and the remaining portions are not penetrated. A plurality of sub-join segments 7322 are formed. Similarly, the sub-separation segments 7321 and the sub-link segments 7322 are interleaved. Referring to FIG. 8, a backlight module according to a third preferred embodiment of the present invention is different from the second preferred embodiment in that the main reflection portion 71 and the side reflection portion 72 are along the two sides of the main reflection portion 71. A plurality of separation segments 731 and a plurality of connection segments 732 are formed between each other. Wherein, along either side 73, the separated segments 731 and the joining segments 732 are disposed in a staggered manner. Further, the length of the separation section 731 10 1295399 along one of the side edges 73 of the main reflection portion 71 is equal to or greater than the length along the main reflection portion joint section 732. The above is only the preferred embodiment of the present invention, and can limit the scope of implementation of the present invention, that is, the application according to the present invention is
71之另一側邊73之 使得導光板4在膨脹時，可分別如圖8中 向，攸分離段731處推擠側反射部72向外移動、丁 一與側反射部72之間產生不規則=動，以避免主 祀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是習知背光模组之側視示意圖； 圖3是習知背光模組之局部示意圖； 圖4是本發明第一較佳實施例之背光模組的立體分解The other side 73 of the 71 causes the light guide plate 4 to expand, as shown in FIG. 8, respectively, the push side reflection portion 72 moves outward at the 攸 separation section 731, and the 丁一 and the side reflection portion 72 are not generated. The rules=actions to avoid the simple equivalent changes and modifications made by the main components and the description of the invention are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a conventional backlight module; FIG. 2 is a schematic side view of a conventional backlight module; FIG. 3 is a partial schematic view of a conventional backlight module; Stereoscopic decomposition of the backlight module of the preferred embodiment
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 12953995 is a side view of the backlight module shown in FIG. 4; FIG. 6 is a perspective exploded view of the backlight module of the second preferred embodiment of the present invention; FIG. 8 is a perspective view of a reflective sheet according to a third preferred embodiment of the present invention 1295399
【主要元件符號說明】 1… .......$光模組 1，·· .......背光模組 3… ……背板 31 ·· .......凹槽 4… ……導光板 41·· .......出光面 42·· .......底面 43〜 4 6 · ·側面 5… ……冷陰極螢光燈管 6… ……反射片 61 ·· .......主反射部 611 .......主反射面 612 .......側邊 62·· .......傾斜反射部 621 .......側邊 63...........側反射部 631 .........側反射面 7 ............反射片 71 ...........主反射部 711 .........主反射面 72 ...........側反射部 721 .........偵J反射面 73 ...........側邊 731 .........分離段 732 .........連結段 7321 ........子分離段 7322 ........子連結段[Description of main component symbols] 1... .......$Optical module 1,···......Backlight module 3.........Backplane 31 ·· .......Concave Slot 4... ...... Light guide plate 41··....... Light-emitting surface 42··....... Bottom surface 43~4 6 · Side surface 5... Cold cathode fluorescent tube 6... ...reflecting sheet 61 ···...main reflecting portion 611 . . . main reflecting surface 612 . . . side 62 ···...... tilting reflecting portion 621 ....... side 63...........side reflection part 631 ......... side reflection surface 7 ........... Reflecting sheet 71 ........... main reflecting portion 711 .... main reflecting surface 72 ........... side reflecting portion 721 ... ...Detective J reflecting surface 73 ........... Side 731 .... Separating section 732 ......... Linking section 7321 . .......sub-separation section 7322 ........ sub-link section
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