201035646 六、發明說明： 【發明所屬之技術領域】 本發明係有關於 一種背光模組之發光 藉由異方性導電膠而 【先前技術】 —種背光模組，更特別有關於 二極體光條，其可撓性電路板 電性連接於印刷電路板。 *隨：電子科技的進步，尤其在曰常生活中隨身 的盛行，對於輕薄短小、耗電量低的顯示 益.、尚求日益增加。液晶顯示器（Liquid Crystal f S’y’ LCD)由於具有耗電力低、發熱量少、重量 輕、以及非發光型顯示器等等的優點，經常被用於 此類的電子產' 中甚至已逐步取代傳統的陰極射 線管顯示器。 丄夢考第1圖，其顯示習用液晶顯示器。一般而 Ο §，液晶顯不器10包含一液晶面板12及一背光模 組14。該背光模組14係配置於該液晶面板12之下 方，用以將光源所發出之光線，均勾的分配至該液 晶面板12上。該液晶顯示器1〇另包含一外框16， 用以固定該液晶面板12與該背光模組14。該背光 模組14可為直下光源型式背光模組或側邊光源型 式背光模組。 由於節能環保的需求，近年來背光模組逐漸以 發光二極體（light emitting diode; LED)取代冷陰極 201035646 螢光燈管（cold cathode fluore-scent lamps ; CCFL)作 為發光源，以達到更加輕、薄、短、小且低耗能需 求。當發光二極體運用背光模組時，發光二極體元 件22係藉由導電線路24而複數個串聯（第2圖所 示）或並聯（圖未示）於一印刷電路板（printed circuit board ; PCB)26上，如此以形成一發光二極體光條 (LED light bar)20。 參考第3圖，以側邊光源型式背光模組為例， 該背光模組50包含一導光板52、一發光二極體光 條20、一反射片54、複數個光學膜片56及至少一 光條固定件68。該反射片54係固定於該導光板52 之底部，且該複數個光學膜片56，諸如稜鏡片及擴 散片等，係固定於該導光板52之頂部上。該導光板 52具有一入光面64及一出光面66。該發光二極體 光條20係安裝於該光條固定件68上，並位於該導 光板52之至少一側邊62上。當該發光二極體光條 20安裝完成後，係以共陰與共陽兩條導線方式出 線。然而，此單一導線迴路（single channel)出線方式 容易造成面黑問題。 參考第4圖，為了解決前述的問題，現行將發 光二極體光條20之出線方式改為藉由熔錫熱壓迴 焊（hot bar reflow)製程，將一可撓性電路板（flexible printed circuit ; FPC)34電性連接於該發光二極體 201035646 光條20之印刷電路板26上， ., 乂夕導線迴败 (mum-channel)並聯方式出線。 、峪 ^ ........眾程乃利用勃 壓頭熔融已印刷於該印刷電路板2 …、 U O /r 藉以將該可撓性電路板34焊接於該印刷 ’ 上。由於熔錫熱壓迴焊製程需以錫 此焊點較多且較小。舉例而言， 工仃，因 ° 邊tp刷電路板201035646 VI. Description of the Invention: [Technical Field] The present invention relates to a backlight module that emits light by means of an anisotropic conductive adhesive [Prior Art] a backlight module, and more particularly relates to a diode light The flexible circuit board is electrically connected to the printed circuit board. * With the advancement of electronic technology, especially in the ordinary life, the popularity of light and thin, low power consumption, and increasing demand. Liquid crystal f S'y' LCD (Liquid Crystal f S'y' LCD) has been gradually replaced by this type of electronic product because of its low power consumption, low heat generation, light weight, and non-illuminated display. A conventional cathode ray tube display. The nightmare test is shown in Figure 1, which shows a conventional liquid crystal display. Generally, the liquid crystal display 10 includes a liquid crystal panel 12 and a backlight module 14. The backlight module 14 is disposed under the liquid crystal panel 12 for distributing the light emitted by the light source to the liquid crystal panel 12. The liquid crystal display 1 further includes an outer frame 16 for fixing the liquid crystal panel 12 and the backlight module 14. The backlight module 14 can be a direct light source type backlight module or a side light source type backlight module. Due to the demand for energy saving and environmental protection, in recent years, the backlight module has gradually replaced the cold cathode fluore-scent lamps (CCFL) with a light emitting diode (LED) as a light source to achieve a lighter , thin, short, small and low energy requirements. When the backlight module is used as the light-emitting diode, the light-emitting diode element 22 is connected in series (shown in FIG. 2) or in parallel (not shown) to a printed circuit board by the conductive line 24. ; PCB) 26, such that a LED light bar 20 is formed. For example, in the third embodiment, the backlight module 50 includes a light guide plate 52, a light-emitting diode strip 20, a reflective sheet 54, a plurality of optical films 56, and at least one Light strip fixture 68. The reflective sheet 54 is fixed to the bottom of the light guide plate 52, and the plurality of optical films 56, such as a cymbal sheet and a diffusion sheet, are fixed on the top of the light guide plate 52. The light guide plate 52 has a light incident surface 64 and a light exit surface 66. The light-emitting diode strip 20 is mounted on the strip fixing member 68 and located on at least one side 62 of the light guide plate 52. When the light-emitting diode strip 20 is installed, it is wired in two ways: a common cathode and a common anode. However, this single-line approach is prone to blackout problems. Referring to FIG. 4, in order to solve the aforementioned problem, the current outlet mode of the light-emitting diode strip 20 is changed to a hot bar reflow process, and a flexible circuit board (flexible) The printed circuit; FPC) 34 is electrically connected to the printed circuit board 26 of the light-emitting diode 201035646 strip 20, and the mum-channel is connected in parallel.峪 ^ ........ The process is performed by the embossing head melted on the printed circuit board 2 ..., U O /r by soldering the flexible circuit board 34 to the printing. Since the hot-melt reflow process requires tin, the solder joints are larger and smaller. For example, work, because of the edge tp brush board
該可撓性電路板34之電性接點28、％ 二、 大於lmm，寬度須大於〇 3 二又須 ^ 9〇 丄 m且兩相鄰電性接 :、之中心線的距離（Pitch)須大於〇 5_， 如弟6圖所示。 d而，該熔錫熱壓迴焊製程具有下列缺點·工 ，易短路-若改以多導線迴路並聯方式，則於錫％ 日:谷易造成相鄰接點電性短路。2、材料浪費―由： 需有—定接合面積，對於該可撓性電路板與 極體光條之印刷電路板皆須於設計時空 方；：Ϊ ’易造成材料的浪費。3、重工困難-錫； 柘二，Γ時’容易因溫度過高容易使該印刷電路 :又，造成重工困難。4、溫度過高—無鉛 此高1 C，該發光二極體光條於 ^易使緊鄰於焊接點之發光二極體元件產 變SC變異風險（如螢光粉受熱產生光學上之 、 、良率不高—由於目前發光二極體光條 201035646 之安裝薇多使用對應單— 埶壓迴焊機…： 線路出線方式之熔錫 干機口。古該機台對應至多導線迴路時，則 各易發生單點斷線，志θ τ5 _ ,, _ 、 呵艮次疋弟一項所述之電性短路問 喊，以致良率過低。 _解决月;J 34的問題因此，便有需要提供—種發 二極體光條’能夠解決前述的問題。 χ 【發明内容】 本發明提供-種發光二極體光條，其包含 :電路板、複數個發光二極體元件、 板及一異方性導命· ^ 仇性電路 ❹卩觀路板包含複數個« 於電性接點。該些發光二極體元件固定於電性連： /印刷電路板。該可撓性電路板包含複數 =接點。該異方性導電朦用以將 ：： 點分別電性連接於該些第二電性接點。生接 根據本發明之發光二極體光條，該 板猎由該異方性導雷 電路 板，具有以下電性連接於該印刷電路 性接點或該可撓性毋 相球電 %路板之兩相鄰電性接點之击 心4之距離(piteh)h* 之運用。2、嗜罝太R$ 虿效增加材料 符合環保規範，對環境破壞小。3、該;= 膠固化溫度（curine b w 生導電 (Uni^emp·)低，大約僅⑽。c以 即可’因此可避亲古… 卜’孤度 免阿纟皿谷易使緊鄰於焊接點之發光 201035646 極體元件產生光學上之變 ^^ 之欠異風險（如螢光粉受熱 之—丌ρ 3亥些發光二極體元件 者可緊鄰於該印刷電路板之接點。4、電性短 路可能性低，其原因在於 μ , ^yr Β ^ %粒子外鍍有絕緣 曰故不易有電性短路情形產生。 料=本發明之上述和其他目的、特徵、和優 ❹ ❹ ，更明顯，下文將配合所附圖示，作詳細說明如 Γ 0 【實施方式】 參考第7圖’其顯示本發明之—實施例之背光 ^ 15G。本實施例僅以側邊光源型式背光模組為 例成明如後’而並㈣制本發明可應詩直下光源 :式背光模組。該背光模組15〇包含一導光板152、 :光條（諸如發光二極體光條12〇)、一反射月⑸、 複數個光學膜片156及至少一光條固定件168。該 反射片154係固定於該導光板152之底部，且該複 ，個光學膜片156,諸如棱鏡片及擴散片等，係固 定於該導光板152之頂部上。該導光板152具有一 入光面164及一出光面166。該發光二極體光條12〇 係安裝於該光條固定件168上，並位於該導光板152 之至少一表面（諸如侧邊162)。 该發光二極體光條12〇包含複數個光源元件 (諸如發光一極體元件〗22)，其以複數個串聯或並 201035646 卷）式於第—電路板（諸如印刷電路板126)上。 光二極體光條12〇安裝完成後’藉由一異方 fUm ： ACF)* 弟—毛路板（諸如可撓性電路板134)之電 2點138電性連接於該發光二極體光條12〇之印 ^路板126的電性接點128,並以多導線迴路 (multl_channei)並聯方式出線。 >考第8圖，該異方性導電膠14〇係位於該印 j H板12 6與可撓性電路才反13 4㈣以將該些 '^ 點128分別電性連接於該些電性接點 二方眭導電膠140主要係由一黏著層142 ，制^ #守導弘粒子144所組成，並藉由加熱與施壓 入 ^可撓性電路板134與該印刷電路板126接 ==通。該異方性導電膠14〇之主要功能只 二可&性電路板134與該印刷電路板126之垂 果。由 1 電性導通，對於水平方向則具有絕緣效 小於錫黑""異方性導電膠140之導電粒子144粒徑 續里方^因此接合面積可較小。舉例而言，根據 140之導電粒子⑷粒徑為一 性接點U8、=126與該可挽性電路板134之電 ―，寬度 之長度可為〇·5_(先前技術為 兩相鄰之電二^ 前技術為〇.3_)，且 之電性接點-…線I:::相： 201035646 仏地’可小於0.3mm(先前技術為〇·5腿），如第9 Ο Ο 圖所不。進步而言’該印刷電路板126與該可撓 性電路板134之電性接點128、138之接合面積可 J於先月ό技術之〇·3 mmxmm。此外，由於使用異 方性導電膠140於可撓性電路才反134與印刷電路板 26之接口’其製程溫度約為⑽。。以下較熔錫熱壓 迴焊低，因而可以減少緊鄰於電性接點126、138之 光一極體元件122之螢光粉，因受熱造成光學上 之邊異。因此，該可撓性電路板134與相鄰之發光 一極體兀# 122 @間距亦可縮小，其最佳值為 1.5mm。此外，由於發光二極體元件122與可撓性 f路板134的間距減少，該發光二極體光條120 單位長度上可以擺放發光二極體元件122數目也 可以增加，增加出光強度。 根據本發明之發光二極體光條，該可撓性電路 板藉由該異方性導轉而電性連接於該印刷電路 板，具有以下優點：卜該印刷電路板之兩相鄰電性 接點或該可撓性電路板之兩相鄰電性接點之中心 線的距離（Pinpi⑽）皆可大幅縮小，可有效增加材料 之運用。2、該異方性導轉本身即為無㈣材， 符合環保規範’對環境破壞小。3、該異方性導带 膠固化溫度（CUring temp)低，大約僅⑽亡以下= 度即可因此可避免兩溫容易使緊鄰於谭接點之發 光二極體it件產生光學上之變異風險（如螢光粉^ 201035646 之變異等)，亦即該些發光二極體元 者可I鄰於該印刷電路板之電性接點 ^路可能性低，其原因在㈣導電粒子外鍍有 絶緣層，故不易有電性短路情形產生。 、=然本發明已以前述實施例揭示，然其並 以限定本發明，任何本發明所屬技術領域中且 常知識者’在不脫離本發明之精神和範園内:义 :各種之更動與修改。因此本發明之保護範圍；視 後附之申請專利範圍所界定者為準。 【圖式簡單說明】 立第1圖為先前技術之液晶顯示器之分解立 思圖。 第2圖為先前技術之發光二極體 雕_ 意圖。 肢不 圖 第曰3圖為先前技術之背光模組之分解立體示意 其顯示A部分放大立體示意圖。 圖 第4圖為先前技術之背光模組之分解立體示意 其顯示B部分放大立體示意圖。 μ 第5圖為先前技術之發光二極體光條沿第4 之剖線5-5之剖面示意圖。 θ 弟6圖為先前技術之發光二極體光條之電性 點之平面示意圖。 第7圖為本發明之—實施例之背光模組之 立體示意圖，其顯示C部分放大立體示意圖。 10 201035646 第8圖為本發明之該 沿第7圖之为丨_ s。 」又發先一極體光條 面示意圖線8-8德’其顯示D部分放大剖 ^圖為本發明之該實施例之發光二極體光條 电I生接點之平面示意圖。 【主要元件符號說明】液晶顯示面板 Ο 10 1420 24 28 36 50 54 6266 背光模 光條 導電線路 電性接點 镇..膏 背光模組 反射片 側邊 出光面 120光條 126印刷電路板 128電性接點 138電性接點 142黏著層 150背光模組 154反射片 162側邊 166出光面 A 部分 C 部分The electrical contact 28 of the flexible circuit board 34, %2, greater than lmm, the width must be greater than 〇3 2 and must be 9 〇丄m and two adjacent electrical connections: the distance of the center line (Pitch) Must be greater than 〇5_, as shown in Figure 6. d, the molten tin hot press reflow process has the following shortcomings: work, easy to short circuit - if the multi-conductor loop is connected in parallel, then the tin is on the day: Gu Yi causes electrical short-circuit of the adjacent contacts. 2, material waste - by: need to have a fixed joint area, the printed circuit board of the flexible circuit board and the polar light strip must be designed in the space; Ϊ ‘ easy to cause material waste. 3, heavy work difficulties - tin; 柘 2, Γ ’ 'easy to easily make the printed circuit due to high temperature: again, causing heavy work difficulties. 4, the temperature is too high - lead-free, this high 1 C, the light-emitting diode light strip is easy to make the light-emitting diode element adjacent to the solder joints change the risk of SC variation (such as the fluorescent powder generated by the optical, The yield is not high - because the current installation of the LED strip 201035646 uses the corresponding single - rolling reflow machine...: the molten iron dryer port of the line outlet mode. When the machine corresponds to the maximum wire loop, Then each is prone to a single point of disconnection, the θ τ5 _ , , _ , 艮 艮 疋 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项 一项There is a need to provide a hair-emitting diode strip to solve the aforementioned problems. [Invention] The present invention provides a light-emitting diode light strip comprising: a circuit board, a plurality of light-emitting diode elements, and a board And an anisotropic guide. ^ The hate circuit circuit board contains a plurality of « electrical contacts. The light-emitting diode components are fixed to the electrical connection: / printed circuit board. The flexible circuit The board contains a complex number = contact. The anisotropic conductive 朦 is used to electrically connect:: points In the second electrical contact, the light-emitting diode strip according to the present invention is generated, and the board is driven by the anisotropic guide circuit board, and has the following electrical connection to the printed circuit contact or the The use of the distance (piteh)h* of the two cores of the flexible 毋 phase ball electric circuit board. 2. The 罝 罝 too R$ 虿 effect increase material meets environmental regulations, damages the environment Small. 3, the; = gel curing temperature (curine bw conductive (Uni^emp·) is low, about only (10). c can be 'so can avoid the ancient ... ... Luminescence of the solder joints 201035646 The polar components are subject to optical variations (eg, the phosphor powder is heated - 丌ρ 3 illuminate the LED components can be adjacent to the printed circuit board contacts. 4 The possibility of electrical short circuit is low, because μ, ^yr Β ^ % is coated with an insulating material, so that it is not easy to have an electrical short circuit. Material = The above and other objects, features, and advantages of the present invention, More obviously, the following description will be given in conjunction with the accompanying drawings, such as Γ 0 [Embodiment] Referring to Figure 7 The backlight 15 15G of the present invention is shown in the embodiment. The present embodiment only uses the side light source type backlight module as an example to make the backlight light source: the backlight module. The backlight module 15A includes a light guide plate 152, a light strip (such as a light-emitting diode strip 12A), a reflective moon (5), a plurality of optical films 156, and at least one light strip fixing member 168. The reflective sheet 154 The light guide plate 152 is fixed to the bottom of the light guide plate 152, and the optical film 156, such as a prism sheet and a diffusion sheet, is fixed on the top of the light guide plate 152. The light guide plate 152 has a light incident surface 164 and A light surface 166. The light emitting diode strip 12 is mounted on the light strip fixing member 168 and located on at least one surface of the light guiding plate 152 (such as the side edge 162). The light-emitting diode strip 12A includes a plurality of light source elements (such as light-emitting diode elements 22) that are on a plurality of series or in series 201035646 on a first circuit board (such as printed circuit board 126). After the installation of the photodiode strip 12〇 is completed, the electric 2 138 of the optical board (such as the flexible circuit board 134) is electrically connected to the light emitting diode by an alien fUm: ACF. The electrical contacts 128 of the printed circuit board 126 are stripped and connected in parallel by a multi-wire loop (multl_channei). > In Fig. 8, the anisotropic conductive adhesive 14 is located on the printed circuit board and the flexible circuit is reversed 13 4 (4) to electrically connect the plurality of points 128 to the electrical properties. The contact two-way conductive adhesive 140 is mainly composed of an adhesive layer 142, which is made up of a conductive layer 144, and is connected to the printed circuit board 126 by heating and pressing the flexible circuit board 134. = pass. The main function of the anisotropic conductive paste 14 is only the effect of the & circuit board 134 and the printed circuit board 126. It is electrically conductive, and has an insulation effect for the horizontal direction. The particle size of the conductive particles 144 is less than that of the tin black "" anisotropic conductive paste 140. Therefore, the bonding area can be small. For example, according to the conductive particle (4) of 140, the particle size is a single contact U8, = 126 and the power of the switchable circuit board 134, the length of the width can be 〇·5_ (the prior art is two adjacent power The former technology is 〇.3_), and the electrical contact-...line I:::phase: 201035646 仏地' can be less than 0.3mm (previous technique is 〇·5 legs), as in the 9th Ο Ο Do not. In terms of progress, the bonding area of the printed circuit board 126 and the electrical contacts 128, 138 of the flexible circuit board 134 can be 3 mm x mm. In addition, since the anisotropic conductive paste 140 is used to interface the printed circuit board 26 with the flexible circuit 140, the process temperature is about (10). . The following is less than hot-melt solder reflow, so that the phosphor of the photo-pole element 122 adjacent to the electrical contacts 126, 138 can be reduced, resulting in optical differences due to heat. Therefore, the flexible circuit board 134 and the adjacent light-emitting body 兀# 122 @ spacing can also be reduced, and the optimum value is 1.5 mm. In addition, since the distance between the light-emitting diode element 122 and the flexible f-channel 134 is reduced, the number of the light-emitting diode elements 122 that can be placed on the unit length of the light-emitting diode strip 120 can also be increased to increase the light intensity. According to the light-emitting diode strip of the present invention, the flexible circuit board is electrically connected to the printed circuit board by the anisotropic conduction, and has the following advantages: two adjacent electrical properties of the printed circuit board The distance between the contact point or the center line of two adjacent electrical contacts of the flexible circuit board (Pinpi (10)) can be greatly reduced, which can effectively increase the application of materials. 2, the heterogeneous transfer itself is no (four) material, in line with environmental regulations 'have little damage to the environment. 3. The CUring temp of the anisotropic tape is low, and only about 10 degrees below the temperature = 2 degrees, so that the two temperatures can easily avoid the optical variation of the LEDs adjacent to the Tan junction. Risk (such as the variation of fluorescent powder ^ 201035646, etc.), that is, the light-emitting diodes may have a low electrical contact point to the printed circuit board, and the reason is that (4) external plating of conductive particles There is an insulating layer, so it is not easy to have an electrical short circuit. The invention has been disclosed in the foregoing embodiments, and the invention is intended to be in the nature of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the appended claims. [Simple description of the diagram] Figure 1 is an exploded view of the prior art liquid crystal display. Figure 2 is a prior art light-emitting diode engraving _ intention. The figure 3 is an exploded perspective view of the backlight module of the prior art. Figure 4 is an exploded perspective view of a backlight module of the prior art. μ Fig. 5 is a schematic cross-sectional view of the prior art light-emitting diode strip taken along line 4-5 of the fourth. Figure θ is a schematic plan view of the electrical point of the prior art light-emitting diode strip. Figure 7 is a perspective view of a backlight module according to an embodiment of the present invention, which shows an enlarged perspective view of a portion C. 10 201035646 Figure 8 is the 丨_s of Figure 7 of the present invention. The first embodiment of the first embodiment of the present invention is a schematic diagram of the junction of the light-emitting diode strips of the light-emitting diode strip of the embodiment of the present invention. [Main component symbol description] LCD panel Ο 10 1420 24 28 36 50 54 6266 Backlight mode strip conductive line electrical contact town.. Paste backlight module reflector side light exit surface 120 light strip 126 printed circuit board 128 electricity Contact 138 Electrical contact 142 Adhesive layer 150 Backlight module 154 Reflector 162 Side 166 Light surface A Part C
12 1622 26 34 38 52 56 6468122 134 140 144 152 156 164 168 B D 液晶面板 外框 發光二極體元 印刷電路板 可撓性電路板 電性接點 導光板 光學膜片 入光面、 光條固定件 發光二極體元 可撓性電路板 異方性導電膠 導電粒子 導光板 光學膜片 入光面 光條固定件 部分 部分12 1622 26 34 38 52 56 6468122 134 140 144 152 156 164 168 BD LCD panel frame light-emitting diode printed circuit board flexible circuit board electrical contact light guide optical film entrance surface, light strip fixture Light-emitting diode element flexible circuit board anisotropic conductive adhesive conductive particle light guide plate optical film into the light surface light strip fixing part part