i 1338181 九、發明說明： 【發明所屬之技術領域】 - 本發明係關於一種背光模組及液晶顯示裝置，特別關 .於一種可解決暗帶問題的背光模組及液晶顯示裝置。 【先前技術】 自從I960年代發光二極體開始商品化以來，由於具 .有高耐震性、壽命長、體積小、高亮度且不含汞污染問題， 所以其應用範圍逐漸遍及日常生活中的各項用品，其亦應 用在液晶顯示裝置之背光模組中以作為發光源。 請參照圖1所示，一種習知的背光模組丨係包含一導 光板11、一軟性電路板12及三個發光二極體I〗。軟性電 路板12鄰設於導光板11之一側邊in，發光二極體a設 置於軟性電路板12上並作為發光源，發光二極體13所發 出之光線經由導光板11之側邊111進入，在導光板Η内 ► 進行全反射而使光均勻化，並藉由導光板1]t之複數印刷 點使光線產生散射而折射出導光板11之一出光面。 ’ 為了降低成本’習知技術另提供一種背光模組，其係 • 減少發光二極體13之數量，而僅使用二個發光二極體。 -請參照圖2所示’背光模組2係包含一導光板21、一軟性 -電路板22及二個發光二極體23。軟性電路板22係鄰設於 導光板21之一側邊211，發光二極體23係設置於軟性電 路板22上並作為發光源。但由於發光二極體23發光角度 的限制（發光二極體之光線發射角度約為11〇度），故於 6 背光模組2之出光面上會形成—暗帶24。如此—來即會 降低背光模組2之出光均勻性，而使得背域組2無法合 適地應用在液晶顯示裳置上。 因此如何提供一種背光模組及液晶顯示裝置，能降 低成本，並藉著發光二極體的配置來解決暗帶的問題，實 為一重要課題。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種能降低成 本，並解決暗帶問題之背光模組及液晶顯示裝置。 緣疋為達上述目的，依本發明之一種背光模組包含 導光板帛光源及一第二光源。導光板具有一第一侧 邊及-與該第i吻目對設置之第二黯；第—光源鄰設 於第-側邊’第二光源鄰設於第二側邊。 為達上述目的’依本發明之一種液晶顯示裝置包含一 背光模組及-液晶面板模組。其中，背光模組包含一導光 板、第一光源及一第二光源，導光板具有一第一側邊及一 與該第一側邊相對設置之第二側邊’第一光源鄰設於第一 側邊，第二光源鄰設於第二側邊·’液晶面板模組係鄰設於 背光模組。 承上所述，因依本發明之一種背光模組及液晶顯示裝 置，第一光源及第二光源係分別設置於導光板相對之第一 側邊及第二側邊，所以二個光源之間可以彼此互補光線不 足之區域，使得背光模組之出光均勻化，故能有效解決暗 明8181 帶的問題，並且由於僅使用二個光源，與習知技術相較， 係減少了光源之使用數量，故能達到降低背光模組及液晶 顯示裝置成本的目的。 【實施方式】 以下將參照相關圖式，說明依本發明較佳實施例之背 光模組及液晶顯示裝置。 3清參照圖3及圖4所示，以說明本發明較佳實施例之 背光模組3 ’圖3係為背光模組3之—爆炸示意圖圖4 係為背光模組3之一前視圖。 ip «光模組3係包含一軟性電路板31、 一第二光源33、一導光板34及一框體％。 軟性電路板31具有一第一端部311、-第二端部312i 1338181 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module and a liquid crystal display device, and particularly relates to a backlight module and a liquid crystal display device which can solve the problem of dark bands. [Prior Art] Since the commercialization of light-emitting diodes in the I960s, due to their high shock resistance, long life, small size, high brightness and no mercury pollution, their applications have gradually spread throughout daily life. The article is also applied to a backlight module of a liquid crystal display device as a light source. Referring to FIG. 1, a conventional backlight module includes a light guide plate 11, a flexible circuit board 12, and three light emitting diodes. The flexible circuit board 12 is disposed adjacent to one side of the light guide plate 11 , and the light emitting diode a is disposed on the flexible circuit board 12 as a light source. The light emitted by the light emitting diode 13 passes through the side 111 of the light guide 11 . Entering, in the light guide plate ► ► is totally reflected to homogenize the light, and the light is scattered by the plurality of printing points of the light guide plate 1]t to refract one light exit surface of the light guide plate 11. In order to reduce the cost, the prior art further provides a backlight module which reduces the number of the light-emitting diodes 13 and uses only two light-emitting diodes. - Referring to FIG. 2, the backlight module 2 includes a light guide plate 21, a flexible circuit board 22, and two light emitting diodes 23. The flexible circuit board 22 is disposed adjacent to one side 211 of the light guide plate 21, and the light-emitting diode 23 is disposed on the flexible circuit board 22 as a light source. However, due to the limitation of the illumination angle of the light-emitting diode 23 (the light emission angle of the light-emitting diode is about 11 degrees), a dark band 24 is formed on the light-emitting surface of the backlight module 2. In this way, the light uniformity of the backlight module 2 is lowered, so that the back domain group 2 cannot be suitably applied to the liquid crystal display skirt. Therefore, how to provide a backlight module and a liquid crystal display device can reduce the cost and solve the problem of the dark band by the arrangement of the light-emitting diodes, which is an important subject. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a backlight module and a liquid crystal display device which can reduce cost and solve the problem of dark bands. In order to achieve the above object, a backlight module according to the present invention comprises a light guide plate and a second light source. The light guide plate has a first side and a second side disposed opposite the i-th pair; the first light source is adjacent to the first side. The second light source is adjacent to the second side. In order to achieve the above object, a liquid crystal display device according to the present invention comprises a backlight module and a liquid crystal panel module. The backlight module includes a light guide plate, a first light source and a second light source. The light guide plate has a first side and a second side opposite to the first side. The first light source is adjacent to the first light source. On one side, the second light source is adjacent to the second side. The liquid crystal panel module is adjacent to the backlight module. According to the present invention, in a backlight module and a liquid crystal display device according to the present invention, the first light source and the second light source are respectively disposed on the first side and the second side of the light guide plate, so that between the two light sources It is possible to complement each other with insufficient light to make the light output of the backlight module uniform, so that the problem of the dark 8181 band can be effectively solved, and since only two light sources are used, the number of light sources is reduced compared with the prior art. Therefore, the purpose of reducing the cost of the backlight module and the liquid crystal display device can be achieved. [Embodiment] Hereinafter, a backlight module and a liquid crystal display device according to a preferred embodiment of the present invention will be described with reference to the related drawings. 3 and FIG. 4, the backlight module 3' of the preferred embodiment of the present invention is illustrated. FIG. 3 is an exploded view of the backlight module 3. FIG. 4 is a front view of the backlight module 3. The ip «light module 3 includes a flexible circuit board 31, a second light source 33, a light guide plate 34 and a frame body %. The flexible circuit board 31 has a first end portion 311 and a second end portion 312.
^彎折部313。第—光源32係設置於第一端部3ιι上， 一光源3 3係設置於第二端部312 I*，私a & 分別驅動第-光源32及第二光源33。第:光=係 =、33係設置於軟性電路板31之同一表面 == 路板Μ經過彎折後（產生騎部 ^^ 32 AM - ^ ^ ± 幻使侍第一先源 第二先ί對而設。因此，圖3及圖"之 幻。"、㈣虛線表示，即前視圖無法看到第二光源 導光板34具有一第一側邊341 相對之笫-伽.惠與第一側邊341 設於=她電路板31之第—端部3_ 導先板…一側邊341’第二端部312係鄰設於導 8 1338181 光板34之第二側邊342，使得第一光源32及第二光源33 亦分別鄰設於第一側邊341及第二側邊342。此外，軟性 電路板31、第一光源32、第二光源33及導光板34係設 置於框體35内。 請參照圖4所示，導光板34更具有相對設置之一第 三側邊343及一第四側邊344，第三側邊343及第四側邊 344係分別與第一側邊341及第二側邊342相鄰。在本實 施例中，第一側邊341及第二側邊342係約為31mm，第 三側邊343及第四側邊344係約為41mm。另外，第一光 源32與第三側邊343具有一第一距離dl，且與第四側邊 344具有一第二距離d2，在本實施例中，第一距離dl約 為6mm，第二距離d2約為25mm，第一距離dl與第二距 離d2之比例係約為6比25 ;第二光源33與第三側邊343 具有一第三距離d3，且與第四侧邊344具有一第四距離 d4，在本實施例中，第四距離d4約為6mm，第三距離d3 約為25mm，第四距離d4與第三距離d3之比例係約為6 比25。需注意者，這些比例及尺寸係為本實施例之最佳比 例，以得到最佳的背光源，當然，在其他實施例中，可依 據導光板之尺寸、光源之發光角度或其他相關因素來設計 最佳比例。 請參照圖5所示，圖5係為導光板34、第一光源32、 第二光源33及軟性電路板31之一誇大側視圖。第一光源 32及第二光源33係分別鄰設導光板34之第一側邊341及 第二側邊342，且第一光源32及第二光源33所發出之光 1338181 線係分別由第一側邊341及第二側邊342進入導光板34。 導光板34具有一出光面345及一與出光面345相對之一 表面346。其中，表面346具有複數印刷點347，印刷點 347具有散射光線的能力，當光線藉由印刷點347散射後， 即破壞光線於導光板34内的全反射，造成部分光線折射 出導光板34之出光面345。在本實施例中，第一光源32 及第二光源33可為一發光二極體或一雷射二極體，由於 本實施例之背光模組3是由侧邊入光，所以第一光源32 及第二光源33更可分別為一側面發光二極體。 另外，本實施例係僅利用一軟性電路板31來驅動第 一光源32及第二光源33，故可降低成本。當然，第一光 源32及第二光源33亦可分別利用二軟性電路板來驅動。 請參照圖6所示，第一光源32及第二光源33係分別設置 於第一軟性電路板31’及第二軟性電路板31”上。第一軟 性電路板31’及第二軟性電路板31”係分別鄰設導光板34 之第一側邊341及第二側邊342，使得第一光源32及第二 光源亦分別鄰設於第一側邊341及第二側邊342。第一光 源32及第二光源33所發出之光線係分別由第一側邊341 及第二側邊342進入導光板34。 請參照圖7所示，背光模組3更包含一反射片36，反 射片36係相對於導光板34之出光面345而設置，意即反 射片36鄰設導光板34之表面346，係用以將自表面346 外露出去之光線反射回導光板34内，以提高光線的使用 效率。 10 1338181 另外，背光模組3更包含複數光學薄膜37，光學薄膜 37係鄰設於導光板34之出光面345。在本實施例中，光 學薄膜37係可包含一擴散片及一稜鏡片，擴散片係用來 使光的分佈更加均勻，使得從正面看不到反射點的影子。 而稜鏡片可修正光的方向，而達到聚光的效果以提高出光 面345的亮度。 另外，背光模組3亦具有一保護片38鄰設於光學薄 膜37，保護片38係用以保護背光模組3，保護片38係可 藉由一雙面膠39與背光模組3之其他元件連結。 接著，請參照圖8以說明本發明較佳實施例之液晶顯 示裝置。 液晶顯示裝置4係包含上述之背光模組3及一液晶面 板模組41。液晶面板模組41係鄰設於背光模組3。液晶 面板模組41係具有兩基板、以及一夾設於兩基板間的液 晶層。背光模組3提供光線入射至液晶面板模組41後， 藉由兩基板之電極層控制液晶分子的轉動角度來調變光 線，而於液晶面板模組41上呈現畫面。 請參照圖9所示，其係為背光模組3及液晶顯示裝置 4之可視區（View Area) V之一示意圖，可視區V係指使 用者可看見液晶顯示裝置4上晝面之區域，圖9中之可視 區V係表示對應於導光板34時之可視區V大小（如斜線 部份所示）。 由於第一光源32及第二光源33分別鄰設於導光板34 之第一側邊341及第二側邊342，可互相彌補光線強度較 11 1338181 弱的區域，但由於第一光源32及第二光源33具有發光齊 度的限制，所以在可視區V上之光線會有亮度相對較高及 相對較低的區域。如圖9所示，可視區V可分為一第〆光 區VI、一第二光區V2及一光重疊區V3,其中第一光處 VI及第二光區V2之亮度相對於光重疊區V3低。請同時 參照圖5所示’為使整個可視區v之亮度可以較平均，# 使導光板34之表面346上之印刷點347具有不同密度的 分佈。在密度較密的區域，較多的光線被散射，故可造成 較而的亮度；相對來說，在密度較疏的區域，較少的光線 被散射’故可造成較低的亮度，如此，就可使可視區V之 亮度平均化。 當然，一般使用者習慣於可視區v中央亮度較高之設 計’為了符合一般使用者的視覺習慣，光重疊區V3之中 央部份所對應之導光板34之印刷點347也可具有較大的 雄·度’以提高在可視區V中央的亮度。^ Bending portion 313. The first light source 32 is disposed on the first end portion 3, and the light source 33 is disposed on the second end portion 312I*. The first light source 32 and the second light source 33 are driven respectively. No.: Light = system =, 33 is set on the same surface of the flexible circuit board 31 == After the road board is bent (the riding part is generated ^^ 32 AM - ^ ^ ± 幻使使第一先源Second first ί Therefore, the illusion of Fig. 3 and Fig. ", (d) dashed line indicates that the front view cannot see that the second light source light guide plate 34 has a first side 341 opposite to the 笫-gamma. The first side 341 is disposed at the first end of the circuit board 31. The first end 312 is disposed adjacent to the second side 342 of the light guide 34 of the guide 8 1338181. The light source 32 and the second light source 33 are also disposed adjacent to the first side 341 and the second side 342. The flexible circuit board 31, the first light source 32, the second light source 33, and the light guide plate 34 are disposed on the frame 35. Referring to FIG. 4, the light guide plate 34 further has a third side 343 and a fourth side 344 disposed opposite to each other, and the third side 343 and the fourth side 344 are respectively associated with the first side 341. The first side 341 and the second side 342 are about 31 mm, and the third side 343 and the fourth side 344 are about 41 mm. One light The source 32 has a first distance d1 from the third side 343 and a second distance d2 from the fourth side 344. In this embodiment, the first distance d1 is about 6 mm, and the second distance d2 is about 25 mm. The ratio of the first distance dl to the second distance d2 is about 6 to 25; the second light source 33 has a third distance d3 with the third side 343 and a fourth distance d4 from the fourth side 344. In this embodiment, the fourth distance d4 is about 6 mm, the third distance d3 is about 25 mm, and the ratio of the fourth distance d4 to the third distance d3 is about 6 to 25. It should be noted that these ratios and dimensions are The optimum ratio of this embodiment is to obtain an optimal backlight. Of course, in other embodiments, the optimal ratio can be designed according to the size of the light guide plate, the illumination angle of the light source or other related factors. 5 is an enlarged side view of one of the light guide plate 34, the first light source 32, the second light source 33, and the flexible circuit board 31. The first light source 32 and the second light source 33 are respectively adjacent to the first side of the light guide plate 34. The side 341 and the second side 342, and the light 1388181 line emitted by the first light source 32 and the second light source 33 are respectively The first side 341 and the second side 342 enter the light guide plate 34. The light guide plate 34 has a light exit surface 345 and a surface 346 opposite to the light exit surface 345. The surface 346 has a plurality of printed dots 347, and the printed dots 347 have The ability to scatter light, when the light is scattered by the printed dots 347, destroys the total reflection of the light in the light guide plate 34, causing some of the light to be reflected off the light exit surface 345 of the light guide plate 34. In this embodiment, the first light source 32 The second light source 33 can be a light emitting diode or a laser diode. Since the backlight module 3 of the embodiment is lighted by the side, the first light source 32 and the second light source 33 can be respectively A side light emitting diode. Further, in the present embodiment, the first light source 32 and the second light source 33 are driven by only one flexible circuit board 31, so that the cost can be reduced. Of course, the first light source 32 and the second light source 33 can also be driven by two flexible circuit boards, respectively. Referring to FIG. 6, the first light source 32 and the second light source 33 are respectively disposed on the first flexible circuit board 31' and the second flexible circuit board 31". The first flexible circuit board 31' and the second flexible circuit board The first side 341 and the second side 342 of the light guide plate 34 are respectively disposed adjacent to the first side 341 and the second side 342 respectively. The light emitted by the first light source 32 and the second light source 33 enters the light guide plate 34 by the first side 341 and the second side 342, respectively. As shown in FIG. 7 , the backlight module 3 further includes a reflective sheet 36 disposed opposite to the light emitting surface 345 of the light guide plate 34 , that is, the reflective sheet 36 is adjacent to the surface 346 of the light guide plate 34 . The light emitted from the surface 346 is reflected back into the light guide plate 34 to improve the efficiency of light use. In addition, the backlight module 3 further includes a plurality of optical films 37, and the optical film 37 is disposed adjacent to the light-emitting surface 345 of the light guide plate 34. In the present embodiment, the optical film 37 may comprise a diffusion sheet and a slab, and the diffusion sheet is used to make the light distribution more uniform so that the shadow of the reflection point is not visible from the front side. The cymbal can correct the direction of the light and achieve the effect of concentrating to increase the brightness of the illuminating surface 345. In addition, the backlight module 3 also has a protective sheet 38 disposed adjacent to the optical film 37. The protective sheet 38 is used to protect the backlight module 3. The protective sheet 38 can be replaced by a double-sided adhesive 39 and the backlight module 3. Component link. Next, please refer to Fig. 8 for explaining a liquid crystal display device in accordance with a preferred embodiment of the present invention. The liquid crystal display device 4 includes the above-described backlight module 3 and a liquid crystal panel module 41. The liquid crystal panel module 41 is adjacent to the backlight module 3. The liquid crystal panel module 41 has two substrates and a liquid crystal layer interposed between the substrates. After the backlight module 3 supplies light to the liquid crystal panel module 41, the electrode layer of the two substrates controls the rotation angle of the liquid crystal molecules to change the light, and the liquid crystal panel module 41 presents a picture. Referring to FIG. 9 , it is a schematic diagram of a view area V of the backlight module 3 and the liquid crystal display device 4 , and the visible area V refers to an area where the user can see the face of the liquid crystal display device 4 . The visible area V in Fig. 9 indicates the size of the visible area V when it corresponds to the light guide plate 34 (as indicated by the hatched portion). Since the first light source 32 and the second light source 33 are respectively disposed adjacent to the first side 341 and the second side 342 of the light guide plate 34, the light intensity is weaker than the area of 11 1338181, but the first light source 32 and the first light source 32 The two light sources 33 have a limitation of the uniformity of illumination, so that the light on the visible area V has a relatively high and relatively low brightness area. As shown in FIG. 9, the visible region V can be divided into a first light-emitting region VI, a second optical region V2, and a light-overlapping region V3, wherein the brightness of the first light portion VI and the second light region V2 overlaps with the light. Zone V3 is low. Referring to FIG. 5 at the same time, in order to make the brightness of the entire visible area v relatively average, the printed dots 347 on the surface 346 of the light guide plate 34 have different density distributions. In densely dense areas, more light is scattered, which can result in a higher brightness; relatively speaking, in areas with less density, less light is scattered, which can result in lower brightness, so The brightness of the visible area V can be averaged. Of course, the general user is accustomed to the design of the central portion of the visible area v having a high brightness. In order to conform to the visual habits of the general user, the printing point 347 of the light guide plate 34 corresponding to the central portion of the light overlapping area V3 may also have a larger The male degree 'to increase the brightness in the center of the visible area V.
細上所述，因依本發明之 一〜裡好艽犋殂及液晶顯示裝 一^中n源及第二光源分別置於導光板相對之第 第二：邊’所以二光源之間可以彼此互補光線不 ’而有效解決暗帶的問題，並達到降低成本的目 的。此外，本發明不限制於使用二個光源，光源 =導:板或液晶面板的尺寸來決定，若使 ：： =亦可運用本發明同樣的原則，亦即 = Γ 邊，以提供互補的光線，進而解決暗帶2 12 1338181 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，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為一種習知背光模組之一示意圖； 圖2為另一種習知背光模組之一示意圖； $ 圖3為依據本發明較佳實施例之一種背光模組之一爆 炸不' 意圖， 圖4為依據本發明較佳實施例之一種背光模組之一示 意圖； 圖5為依據本發明較佳實施例之一種背光模組之一誇 大側視圖； 圖6為依據本發明較佳實施例之一種背光模組，其係 具有二軟性電路板之一示意圖； • 圖7為依據本發明較佳實施例之一種背光模組之一爆 炸示意圖； 圖8為依據本發明較佳實施例之一種液晶顯示裝置之 一示意圖；以及 - 圖9為依據本發明較佳實施例之一種背光模組及可視 區之一示意圖。 13 1338181As described above, according to one aspect of the present invention, the liquid source display and the second source and the second light source are respectively disposed on the second side of the light guide plate: the two light sources can be mutually connected to each other. Complementary light does not 'effectively solve the problem of dark bands, and achieve the purpose of reducing costs. In addition, the present invention is not limited to the use of two light sources, the light source = guide: the size of the panel or the liquid crystal panel, if:: = can also use the same principle of the invention, that is, = Γ edge to provide complementary light Further solving the dark band 2 12 1338181 The above description is by way of example only and not as a limitation. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional backlight module; FIG. 2 is a schematic diagram of another conventional backlight module; FIG. 3 is a backlight module according to a preferred embodiment of the present invention. FIG. 4 is a schematic diagram of a backlight module according to a preferred embodiment of the present invention; FIG. 5 is an enlarged side view of a backlight module according to a preferred embodiment of the present invention; A backlight module according to a preferred embodiment of the present invention has a schematic diagram of two flexible circuit boards; FIG. 7 is a schematic exploded view of a backlight module according to a preferred embodiment of the present invention; A schematic diagram of a liquid crystal display device according to a preferred embodiment of the invention; and FIG. 9 is a schematic diagram of a backlight module and a viewing area according to a preferred embodiment of the present invention. 13 1338181
元件符號說明： 1、2、3 II 、 21 、 34 III 、 211 12、 22、31 13、 23 24 31’ 31” 311 312 313 32 33 341 342 343 344 345 346 347 35 36 37 背光模組 導光板 側邊 軟性電路板 發光二極體 暗帶 第一軟性電路板 第二軟性電路板 第一端部 第二端部 彎折部 第一光源 第二光源 第一側邊 第二側邊 第三側邊 第四側邊 出光面 表面 印刷點 框體 反射片 光學薄膜 1338181 38 保護片 39 雙面膠 4 液晶顯不裝置 41 液晶面板模組 dl 第一距離 d2 第二距離 d3 第三距離 d4 第四距離 V 可視區 VI 第一光區 V2 第二光區 V3 光重疊區Description of component symbols: 1, 2, 3 II, 21, 34 III, 211 12, 22, 31 13, 23 24 31' 31" 311 312 313 32 33 341 342 343 344 345 346 347 35 36 37 Backlight module light guide Side flexible circuit board light emitting diode dark strip first flexible circuit board second flexible circuit board first end second end bent part first light source second light source first side second side third side Fourth side light-emitting surface printing point frame reflector sheet optical film 1338181 38 Protective sheet 39 double-sided tape 4 liquid crystal display device 41 liquid crystal panel module dl first distance d2 second distance d3 third distance d4 fourth distance V Visible area VI First light zone V2 Second light zone V3 Light overlap zone
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