'W 26710twf.doc/n 200935571 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種異方性導電膜（anis〇tr〇pic conductive film，ACF)及其製作方法，且特別是有關於一 種由複合碳纖維(composite carbon fibers)構成的異方性導 電膜及其製作方法。 【先前技術】 異方性導電膜是指具有單方向導電特性的薄膜，其材 料一般是由導電粒子與絕緣樹脂所構成。異方性導電膜主 要應用在無法透過高溫鉛錫焊接的製程，譬如液晶顯示面 板以及驅動1C之訊號傳輸連結。 而異方性導電膜通常放在待接通的上、下元件之間 後，壓合上、下元件，以使垂直的導電粒子間彼此接锔， 再經加熱及加壓一段時間後，使異方性導電膜中的絕緣樹 脂固化’而形成垂直導通、橫向絕緣的結構。 不過，隨著驅動1C的腳距(pitch)持續微縮，橫向腳位 電極之凸塊間距(space)也越來越窄，導致異方性導電膜中 之導電粒子在壓合的過程中，橫向的凸塊間彼此接觸，而 造成橫向導通的短路。 為了解決這個問題，已有許多異方性導電膜結構陸續 被提出。常見的是在導電粒子的表層吸附細微顆粒之樹 脂，以便達到表面絕緣的功能。這種結構的特性是導電粒 子外圍的樹脂在凸塊接點壓合時會被破壞，使得垂直方向 導通，以避免橫向粒子直接碰觸而造成短路的現象。不過， 2671〇twf.doc/n 當壓合時若無法完全破壞 ☆ 士+ ....... 等电粒子外圍的樹脂，則會增加 t特性t ’這種 ❹ Ο 200935571 岙吉古忐沾社纽兩 仅子电粒子外圍的樹脂 另種電膜的垂直導通特性。 含=二異=膜， :=:rr的機率。然而，“ 因：=子::二相導電膜的厚度須縮減, 【發明内容】 本發明提供一種異方性導帝膜 單的製程做出橫向不導電的異方性導電膜。以利用間 極佳異雜導電膜，無需壓合即可達到 本發明提a-觀方性導鶴的製作方法，包括先 ==:!維，所述複合碳纖維是由碳纖維及其表面 -磁ΐ 性金屬氧化㈣所構成。然後，施加 :磁场：以使所述複合碳纖維以同一方向排列於一墊板 所述ίί層:塾板上形成一固著層，使複合碳纖維被包含 $本發明之第一實施例中’上述形成所述固著層之方 去包括於所述墊板上塗佈樹脂，再固化所述樹脂。 選擇實施例中’在形成所述固著層之後可 在本發明之第一實施例中，上述墊板還具有一黏著層。 200935571 TW 26710twf.doc/n 在本發明之第一實施例中，上述黏著層的材料包括樹 脂’如環氧樹脂或聚亞醯胺(p〇lyimide)樹脂。 在本發明之第一實施例中，上述黏著層的材料包括無 機型之黏著劑’如二氧化;g夕或銀膠。 上述墊板的材料包括玻璃 在本發明之第·一實施例中， 基板或銘基板。 ❹'W 26710twf.doc/n 200935571 IX. Description of the Invention: [Technical Field] The present invention relates to an anisotropic conductive film (ACF) and a method for fabricating the same, and in particular The invention relates to an anisotropic conductive film composed of composite carbon fibers and a manufacturing method thereof. [Prior Art] The anisotropic conductive film refers to a film having a unidirectional conductive property, and the material is generally composed of conductive particles and an insulating resin. The anisotropic conductive film is mainly used in processes that cannot pass high-temperature lead-tin soldering, such as a liquid crystal display panel and a signal transmission link that drives 1C. The anisotropic conductive film is usually placed between the upper and lower components to be connected, and the upper and lower components are pressed together so that the vertical conductive particles are connected to each other, and then heated and pressurized for a period of time. The insulating resin in the anisotropic conductive film is cured to form a structure of vertical conduction and lateral insulation. However, as the pitch of the driver 1C continues to shrink, the pitch of the lateral pin electrodes becomes narrower and narrower, resulting in the conductive particles in the anisotropic conductive film being pressed during the lateral direction. The bumps are in contact with each other, causing a short circuit of lateral conduction. In order to solve this problem, many anisotropic conductive film structures have been proposed. It is common to adsorb the fine particles of the resin on the surface of the conductive particles in order to achieve the function of surface insulation. The characteristic of this structure is that the resin on the periphery of the conductive particles is destroyed when the bump contacts are pressed, so that the vertical direction is turned on to avoid the short-circuit phenomenon caused by the direct contact of the lateral particles. However, 2671〇twf.doc/n cannot be completely destroyed when pressed. ☆士+....... The resin on the periphery of the electric particle will increase the t characteristic t '❹ Ο 35 200935571 岙吉古忐The vertical conduction characteristics of the electric film of the resin on the periphery of the two sub-electrodes. Contains = two different = membrane, :=: rr probability. However, the reason is that the thickness of the two-phase conductive film is reduced, and the present invention provides an anisotropic conductive film which is made of a laterally non-conductive conductive process. An excellent hetero-poly conductive film can be used to achieve the a-viewing aspect of the present invention without pressing, including the first ==:! dimension, the composite carbon fiber is composed of carbon fiber and its surface-magnetic metal Oxidation (4). Then, applying: a magnetic field: the composite carbon fibers are arranged in the same direction on a lining plate to form a fixing layer, so that the composite carbon fiber is included in the first aspect of the invention. In the embodiment, the method of forming the fixing layer described above includes coating a resin on the backing plate to re-solidify the resin. In the embodiment, 'the formation of the fixing layer may be the first aspect of the invention. In one embodiment, the backing plate further has an adhesive layer. 200935571 TW 26710twf.doc/n In the first embodiment of the invention, the material of the adhesive layer comprises a resin such as epoxy resin or polyamidamine (p 〇lyimide) resin. In the first embodiment of the present invention The material of the above adhesive layer includes an inorganic type of adhesive such as oxidized metal or silver paste. The material of the above-mentioned backing plate includes glass. In the first embodiment of the present invention, the substrate or the substrate.
在本發明之第—實關巾，上述製備複合碳纖維之方 法匕括以電鍍、無電電鍍、聚摻合、原位化學生成或電漿 ，方式’在碳纖維表面上形成磁性金屬層或磁性金屬氧化 銘等$發明之第―實施射，上祕_包括錄、鐵、 本發明另提出-種異方性導電膜，包括— Ϊ面屬或是磁性金屬氧化物的多個複二炭纖 維月ϋ述複合碳纖維是以同一方向排列於固著層内。 實施例中，上述複合‘的-端突 脂，=:第二實施例中，上述固著層的材料包括樹 在本發明之第二實施例中，上述複合碳 覆的磁性金屬包括鎳、鐵、料。 …之表面包 本發明因採用複合碳纖維作為導電路徑 加磁場的方式’輕易達到讓複合破纖—“:用： 結果。因此’本發明之異方性導電膜在使用上:=的 200935571 「W 2671〇twf.doc/n 電路护A去方^導電特性，也可避免產生橫向導 电路杬。再者，本發明之異方性 過高溫錯料㈣除了應用在無法透 技術。 還可用於觸控面板(touch panel) =本發明之上述特徵和優點能更明顯易懂，下文特 牛較佳實施例’舰合所關式，作詳細 【實施方式】In the first solid towel of the present invention, the above method for preparing the composite carbon fiber includes electroplating, electroless plating, poly blending, in situ chemical formation or plasma, and the method of forming a magnetic metal layer or magnetic metal oxide on the surface of the carbon fiber. Ming et al., the first invention of the invention, the implementation of the secret, including the recording, iron, the invention proposed another kind of anisotropic conductive film, including - Ϊ genus or magnetic metal oxide of a plurality of complex carbon fiber The composite carbon fibers are arranged in the same direction in the anchor layer. In the embodiment, the composite 'end-end grease, =: in the second embodiment, the material of the fixing layer includes a tree. In the second embodiment of the present invention, the composite carbon-coated magnetic metal includes nickel and iron. ,material. The surface of the present invention is made by using a composite carbon fiber as a conductive path and a magnetic field to easily achieve a composite fiber break--": use: result. Therefore, the anisotropic conductive film of the present invention is used: = 200935571 "W 2671〇twf.doc/n circuit protection A to the side ^ conductive characteristics, can also avoid the generation of lateral conduction circuit 杬. Furthermore, the anisotropic over temperature of the present invention (four) in addition to the application of the technology can not be used. Touch panel=The above features and advantages of the present invention can be more clearly understood. The following is a preferred embodiment of the present invention.
—文巾參看隨關式來更充分地描述本發明，隨附圖 式中展不本發明之實施例。然而，本發明可以許多不同形 式來體現，且不應將其解釋為限於本文所陳述之實施例。 實情為’提供此等實關錢得本揭露隸詳盡且完整， 且將會將本發明之齡完全傳達輯屬麟領域中具有通 承知識者。在圖式t ’為明確域可誇飾各層以及區域的 尺寸以及相對尺寸作。 圖1疋依照本發明之第一實施例之一種異方性導電膜 的製程步驟圖。 、 請參照圖1，於步驟1〇〇中，先製備複合碳纖維，這 種複合碳纖維是由碳纖維及其表面的磁性金屬層 (magnetic metal film)或磁性金屬氧化物層所構成。而製備 複合石厌纖維之方法譬如是以電鐘、無電電鑛、聚摻合原 位化學生成或電漿之方式，在碳纖維表面上形成如鎳、鐵、 鈷等的磁性金屬層或者形成磁性金屬氧化物層。 然後，於步驟110中，施加一磁場，以使所述複合碳 纖維以同一方向排列於一墊板(tempiate)上，其中墊板上具 W 2671Otwf.doc/n 200935571 有黏著層，且黏著層的材料例如樹脂， 醯胺(polyimide)樹脂等；或者，黏著 脂或聚亞 機型之黏，如二氧切或銀^㈣材料也可以是無 之後’於步驟120巾，於塾板上形成一固 著層内。而上述形成固著層之方法 可選擇於墊板上塗佈樹脂，再固化所述樹脂。- The present invention will be described more fully hereinafter with reference to the accompanying drawings. However, the invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. The fact is that the provision of such real money is disclosed in detail and complete, and will fully convey the age of the invention to those who have inherited knowledge in the field of Lin. The figure t' is an explicit field that can be used to exaggerate the dimensions and relative sizes of the layers and regions. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a process drawing diagram of an anisotropic conductive film in accordance with a first embodiment of the present invention. Referring to Fig. 1, in step 1 , a composite carbon fiber is prepared, which is composed of a carbon fiber and a magnetic metal film or a magnetic metal oxide layer on the surface thereof. The method for preparing the composite stone fiber is formed by forming a magnetic metal layer such as nickel, iron, cobalt or the like on the surface of the carbon fiber by means of an electric clock, an electroless ore, a poly-in-situ chemical formation or a plasma. Metal oxide layer. Then, in step 110, a magnetic field is applied to arrange the composite carbon fibers in a same direction on a tempiate, wherein the pad has an adhesive layer and an adhesive layer. Materials such as resins, polyimide resins, etc.; or adhesives of adhesive or poly-type, such as dioxo or silver (4) materials may also be after the 'step 120, forming a sheet on the raft Within the fixation layer. The above method of forming the anchor layer may be selected by coating a resin on the backing plate and then curing the resin.
最後可依照異方性導電膜的應用範圍^擇是否進行步 驟130 ’將上述墊板移除。 以下是第-實施例之步驟咖〜⑽的實驗例。 (一）、製備複合碳纖維 首先，先以硝酸對碳纖維表面進行預處理，目的是將 碳纖表面粗糙化增加其與後續鍍液濕潤(wet 利化學鍍於碳纖維上之均勻度。 接著，將預處理完後之碳纖維置入化學鍍液中進行反 應。化學鍍鍍液的成份與操作條件如下： 1.成份：鎳離子溶液、金屬螯合劑與還原劑。另外用 NaOH、HC1控制反應酸鹼值。 2.操作條件：操作溫度約70 DC、pH值約8.5、反應 時間則在2〜3小時之間。 圖2即為上述製備複合碳纖維的示意圖。由圖2可知， 在進行無電電鍍過程中，鎳金屬會不斷往碳纖維表面沉積。 (二）、使複合碳纖維以同一方向排列 在完成上一步驟後，如圖3所示，準備一個墊板3〇〇 例如是玻璃基板或是銘基板，並於塾板300上塗佈環氧樹 ΓW 2671Otwf.doc/n 200935571 脂或聚亞醯胺作為黏著層，再將磁鐵302置於墊板3〇〇下 方。由於複合碳纖維304之兩端產生的磁場最強，所以原 本任意排列的複合碳纖維304將會受到磁鐵302吸引，而 使複合碳纖維304的一端附著於墊板3〇〇上之黏著層上並 以同一方向排列。圖4即為施加磁場後複合碳纖維排列於 墊板上的掃描式電子顯微(SEM)相片。Finally, the above-mentioned pad can be removed according to the application range of the anisotropic conductive film. The following is an experimental example of the procedure of the first embodiment - (10). (1) Preparation of composite carbon fiber Firstly, the surface of the carbon fiber is pretreated with nitric acid in order to roughen the surface of the carbon fiber and increase it to be wet with the subsequent plating solution (wet the uniformity of electroless plating on the carbon fiber. Next, the pretreatment After the completion of the carbon fiber is placed in the electroless plating solution for reaction. The composition and operating conditions of the electroless plating solution are as follows: 1. Composition: nickel ion solution, metal chelating agent and reducing agent. In addition, NaOH and HC1 are used to control the reaction pH value. 2. Operating conditions: operating temperature is about 70 DC, pH is about 8.5, and reaction time is between 2 and 3 hours. Figure 2 is a schematic diagram of the above preparation of composite carbon fiber. As can be seen from Figure 2, in the process of electroless plating, Nickel metal will continue to deposit on the surface of the carbon fiber. (2) The composite carbon fibers are arranged in the same direction. After completing the previous step, as shown in FIG. 3, a backing plate 3, for example, a glass substrate or a substrate is prepared, and Epoxy tree ΓW 2671Otwf.doc/n 200935571 grease or polyamidamine is applied as an adhesive layer on the slab 300, and the magnet 302 is placed under the slab 3 。. The magnetic field generated at both ends is the strongest, so the originally arranged composite carbon fiber 304 will be attracted by the magnet 302, and one end of the composite carbon fiber 304 is attached to the adhesive layer on the backing plate 3 and arranged in the same direction. A scanning electron microscopy (SEM) photograph of the composite carbon fibers arranged on a backing plate after application of a magnetic field.
完成實驗例之後的結構已具有應用於場發射源或平面 光源的潛力。而本發明之第一實施例則還需進行步驟 120，以使複合碳纖維被包含在固著層内。 圖5則是依照本發明之第二實施例之一種異方性導電 膜的立體示意圖。 ~ —請參照圖5,第二實施例中的異方性導電膜包括一層 固著層500以及表面包覆磁性金屬或是磁性金屬氧化物 |未綠不）的複合碳纖維观，其中固著層的材料例如樹脂 t哀氧樹脂）。至於複合碳纖維5G2之表面包覆的磁性金 =如鎳、n或是磁性金屬氧化物。第二實施例中 =複=碳纖維502是以同一方向排列於固著層5〇〇内且 二端可以突出gj著層的表面；當然也可選擇將複合 石反纖^完全包覆於固著層·内部。 之礙道本發明之特點在於使用表面包覆磁性金屬 碳纖維以電路徑’所以僅需施加磁場就達到讓複合 雷膜益®二入向排列的結果。因此，本發明之異方性導 達到極佳的單方向導電特性，也因此避 只°電路徑。此外，本發明之異方性導電膜不但 W 2671 Otwf.doc/n 200935571 能廣泛應用在無法透過高溫鉛錫焊接的製程，甚至還能應 用在觸控面板(touch panel)技術中。 “ 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何所屬技術領域中具有通常知識者在 脫離本發明之精神和範圍内，當可作些許之更動與潤 因此本發明之賴當視後附之申請專概定者 為準。The structure after completion of the experimental example has the potential to be applied to a field emission source or a planar light source. In the first embodiment of the present invention, step 120 is further required to cause the composite carbon fibers to be contained in the anchor layer. Figure 5 is a perspective view showing an anisotropic conductive film in accordance with a second embodiment of the present invention. ~ - Please refer to FIG. 5, the anisotropic conductive film in the second embodiment includes a fixing layer 500 and a composite carbon fiber surface coated with a magnetic metal or a magnetic metal oxide|not green, wherein the fixing layer Materials such as resin t sulphur resin). As for the magnetic gold coated on the surface of the composite carbon fiber 5G2 = such as nickel, n or a magnetic metal oxide. In the second embodiment, the = carbon fiber 502 is arranged in the same direction in the fixing layer 5〇〇 and the two ends can protrude from the surface of the layer; in course, the composite stone can be completely coated on the surface. Layer·internal. It is a feature of the present invention that the surface is coated with magnetic metal carbon fibers in an electrical path, so that only the application of a magnetic field is required to achieve the alignment of the composite Ray-Ray®. Therefore, the anisotropy of the present invention achieves excellent unidirectional conductivity characteristics, and thus avoids only the electric path. In addition, the anisotropic conductive film of the present invention can be widely applied not only to processes that cannot pass through high-temperature lead-tin soldering, but also to touch panel technology. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and it is within the spirit and scope of the invention. The application of the present invention is subject to the application of the application.
❹ 【圖式簡單說明】 導電膜 圖1是依照本發明之第一實施例之一種異方性 的製程步驟圖。 圖2為實驗例一中製備複合碳纖維的示意圖。 圖3是實驗例一中使複合碳纖维以同一方向排列的示 思圖。 圖4是施加磁場後複合碳纖維排列於墊板上的掃 電子顯微相片。 圖5疋依照本發明之第二實施例之一種異方性 的立體示意圖。 媒 【主要元件符號說明】 100〜130 :步驟 300 :墊板 302 :磁鐵 304、502 :複合碳纖維 500 :固著層BRIEF DESCRIPTION OF THE DRAWINGS [Electrical Film] Fig. 1 is a process diagram showing an anisotropic process according to a first embodiment of the present invention. 2 is a schematic view showing the preparation of composite carbon fibers in Experimental Example 1. Fig. 3 is a view showing the arrangement of composite carbon fibers in the same direction in Experimental Example 1. Figure 4 is an electron micrograph of a composite carbon fiber arrayed on a backing plate after application of a magnetic field. Figure 5 is a perspective view showing an anisotropy in accordance with a second embodiment of the present invention. Medium [Main component symbol description] 100~130: Step 300: Backing plate 302: Magnet 304, 502: Composite carbon fiber 500: Fixing layer