201010549 -iuc/d 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種可撓性電路板，且特別是有關於 一種具有特殊結構以減缓其機械應力之可撓性電路板。 【先前技術】 隨著封裝科技的發展，覆晶薄膜（chip on film, COF) ^ 熱壓:fcf·科技已成為先進的封裝科技之一。一；般來說，覆晶 薄膜熱壓:fcp科技應用的範圍很廣泛’舉例來說，液晶面板 與驅動積體電路(integrated circuit，1C)之間的電性連接就 是COF熱壓焊科技的其中一種應用。 參照圖1與圖2。圖1為電子裝置4之橫切面圖，圖 2為另一電子裝置6之橫切面圖。舉例來說，每個電子裝 置4及6可以是薄膜電晶體液晶顯示器（thin film transistor liquid crystal display, TFT_LCD)、電漿顯示器、有機發光 二極體顯示器（organic light-emitting diode display，OLED) ® 賴示器。每個電子裝置4及6具有顯示面板8:印刷電 路板 10 (printed circuit board, PCB)、驅動 IC 12 以及可 撓性電路板14。PCB 10具有内建的時間控制器，以產生 時間信號而錄制驅動IC 12之運作。可撓性電路板14可 被彎曲。藉此’ PCB 10可以置於電子裝置4的上方（如圖 1所示）’或置於顯示面板8的背面（如圖2所示）。驅 動1C 12形成在可撓性電路板14上，且根據内建於㈣ι〇 5 ❿ 馨 201010549.„ 之時間控制器所接收到的時間信號，進行驅動IC 12之運 作。 參照圖3 ’圖3為顯示面板8、PCB 1〇、驅動 以及可撓性電路板14之示意圖。驅動1(： 12在可撓性電路 板14上形成’且經由多條導線16與pcB 1〇電性連 以及經由多條導線18與顯示面板8電性連接。每條導線 16具有外引腳la、内5|腳lb以及連接部化。連接部化 連接外引腳la與内引腳15。如圖3所示，外引腳七 μ寬度’而導線16為彎曲的並具有銳利 2角。然而，當可撓性電路板14料曲時，由於銳利的 轉角所造成的高應力密度，外引腳13與連接部^之 部=及内引腳lb與連接部le之接合部就很容易斷裂^ 而¥致在PCB 10與鶴IC 12之_信號傳輸失敗。 ^在日本第H11/345839號的已公開專利申請案中，揭 露了一種可撓性電路板。參照圖4與圖5，圖4為上述曰 本已公開專利申請案所揭露之可撓性電路板的示意圖1Γ而 圖5為圖4中可撓性電路板的導線之放大圖。如圖4所示， 可挽性電路板之兩條導線分別形成對應的凹口 2。每個凹 口 2為内側的圓凹區，以減緩外引腳1&之接合部在内緣 2a及連接部lc的機械應力。然而，内引腳比之接合部％ =及連接部lc都為銳利的轉角，因此都會受高應力集中的 影響’而增加接合部2b在施力下斷裂的機率。 【發明内容】 6 oc/d 201010549 本發明提供一種可撓性電路板，可減少外引腳之接合 部及連接部在施力下斷裂的機率。 本發明提供一種可撓性電路板，可減少内引腳之接合 部及連接部在施力下斷裂的機率。201010549 -iuc/d IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a flexible circuit board, and more particularly to a flexible circuit board having a special structure to mitigate mechanical stress thereof. . [Prior Art] With the development of packaging technology, chip on film (COF) ^ hot pressing: fcf· technology has become one of the advanced packaging technologies. Generally speaking, flip-chip film hot pressing: fcp technology has a wide range of applications. For example, the electrical connection between a liquid crystal panel and an integrated circuit (1C) is COF thermocompression bonding technology. One of the applications. 1 and 2 are referred to. 1 is a cross-sectional view of the electronic device 4, and FIG. 2 is a cross-sectional view of another electronic device 6. For example, each of the electronic devices 4 and 6 may be a thin film transistor liquid crystal display (TFT_LCD), a plasma display, or an organic light-emitting diode display (OLED)®. Reminder. Each of the electronic devices 4 and 6 has a display panel 8: a printed circuit board (PCB), a driver IC 12, and a flexible circuit board 14. The PCB 10 has a built-in time controller to record the operation of the driver IC 12 to generate a time signal. The flexible circuit board 14 can be bent. Thereby, the 'PCB 10 can be placed above the electronic device 4 (shown in Figure 1)' or placed on the back of the display panel 8 (as shown in Figure 2). The driving 1C 12 is formed on the flexible circuit board 14, and the operation of the driving IC 12 is performed according to the time signal received by the time controller built in (4) 〇5 ❿201010549. „ Refer to FIG. 3 'FIG. 3 A schematic diagram of the display panel 8, the PCB 1 〇, the drive, and the flexible circuit board 14. The drive 1 (: 12 is formed on the flexible circuit board 14) and electrically connected to the pcB 1 via a plurality of wires 16 and via A plurality of wires 18 are electrically connected to the display panel 8. Each of the wires 16 has an outer pin la, an inner 5|foot lb, and a connection portion. The connection portion connects the outer pin 1a and the inner pin 15. As shown in FIG. The outer lead is seven μ wide and the wire 16 is curved and has a sharp 2 angles. However, when the flexible circuit board 14 is bent, the outer lead 13 is due to the high stress density caused by the sharp corner. The portion of the connection portion ^ and the joint portion of the inner lead lb and the connection portion le are easily broken. ^ The signal transmission failure of the PCB 10 and the crane IC 12 is failed. ^ It has been disclosed in Japanese No. H11/345839 In the patent application, a flexible circuit board is disclosed. Referring to Figures 4 and 5, Figure 4 is the above-mentioned 曰1 is a schematic view of a flexible circuit board disclosed in the published patent application, and FIG. 5 is an enlarged view of a wire of the flexible circuit board of FIG. 4. As shown in FIG. 4, the two wires of the switchable circuit board are respectively Corresponding notches 2 are formed. Each notch 2 is an inner concave portion to relieve the mechanical stress of the outer pin 1& joint at the inner edge 2a and the joint portion lc. However, the inner lead is more than the joint portion % § and the connecting portion lc are sharp corners, and therefore are affected by high stress concentration', and increase the probability of the joint 2b breaking under the force applied. [Invention] 6 oc/d 201010549 The present invention provides a flexibility. The circuit board can reduce the probability of the joint of the outer lead and the joint being broken under the force applied. The invention provides a flexible circuit board, which can reduce the probability of the joint of the inner lead and the joint being broken under the force applied. .
於是’本發明提出-種可撓性電路板。可撓性電路板 包括可撓性薄膜、多條㈣腳、多條外引腳以及多個連接 4。内引腳在可撓性薄膜上形成，且每條内引腳具有第一 寬度。外㈣在可撓㈣膜上形成，且每條外引腳具有大 於第-寬度之第二寬度。每個連接部連接其對應的一條内 引腳與其職的—條外引腳。上述多個連接部中的至少一 個連接部具有_緣與外邊緣。外邊緣具有第—圓凹區、 第二圓凹區以及位於第-圓凹區與第二圓凹區之間的第一 圓凸區。内邊緣具有第二圓凸區、第三圓凸區以及位於第 二圓凸區與第三圓凸區之間的第三圓凹區。 ，本^之-實施例中，第—圓凸區之曲率半徑大於 第二圓凹區之曲率半徑。 Γ^ί本ί明之—實施例中’外邊緣更包括位於第—圓凸 區與第二圓凹區之間的第四圓凸區。 在本發明之-實關巾，㈣緣更包触於第三圓凹 區與第二圓凸區之間的第四圓凹區。 =明之-實施例中’内邊緣與外邊緣彼此相對。 在本發明之-實施例中，其他連接部的每個内邊緣且 圓凸區’而其他連接部的每個;: 邊緣具有至少一圓凹區及至少—圓凸區。 7 201010549⑽ 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉較佳實闕，並配合所關式，作詳細說明如下。 【實施方式】 參照圖6’圖6為本發明第一實施例之可挽性電路板 20的示意圖。可撓性電路板2G具有多條内引腳^、多個 連接部38以及多條外引腳4〇。每個連接部％連接其對應 ❹ 條内引腳36與其對應的-條外引腳4G。如圖6所示， 連接部38之群組32位於内引腳36之群組3〇與外引腳4〇 之群組34之間。每條内引腳36具有第一寬度冒丨，且每 條外引腳40具有第二寬度W2。第二寬度W2大於第一寬 ，w卜根據本發明其他較佳之實施例，第二寬度W2對 第-寬度W1之比值大於或等於3。然而，本發明並不以 此為限。内引腳36或外弓j腳4〇為平行且等距間隔。換言 之’介於兩條浦的㈣腳36之畴在著沿著第—座標轴 X的第—間距1^ ’而介於兩條相鄰的外引腳4G之間存在 ❹ 著沿著第一座標軸X的第二間距D2。此外，内引腳36及 外引腳40沿著第二座標軸γ延伸。值得注意的是，本發 明令的内引聊36或外引腳4〇相鄰引線的間距並不限於任 何特定間距。舉例來說，内引腳36或外引腳4〇可以各樣 的間隔作為間距。 清參照圖7與圖8。目7為可撓性電路板2〇沿著圖6 之A-A，線段之橫切面圖，圖8為可繞性電路板2〇沿著圖6 之B_B，線段之橫切面圖。可撓性電路板20更具有可撓性 8 ioc/d 201010549 薄膜22及銲錫電阻(solderresist，SR)層24。本實施例中，可 撓性薄膜22之材質為聚醯亞胺且具有38mm之厚度。内引 腳36及外引腳40都在可撓性薄膜22上形成，且被銲錫電 阻層24所覆蓋。此外’本實施例中，内引腳36、連接部38 以及外引腳40之材質為銅金屬且具有介於5mm〜2〇mm之厚 度。然而’須注意的是，上述本發明之實施例為一範例，本發 明並不以此為限。 ❹ 再參照圖6，連接部38之群組32當中的連接部38,連接 至内引腳36之群組30當中的内引腳36,以及外引腳40之群 組34當中的外引腳40,。沿第一座標軸χ來看，内引腳36,在 第一座標轴X上的位置範圍，部份或全部地與外引腳4〇在第 一座標軸X上的位置範圍重疊。然而，沿第二座標轴γ來看， 連接部38’將内引腳36’和外引腳4〇,分隔開。 參照圖9，圖9為連接部38,附近區域之放大圖。連接部 38具有内邊緣42及外邊緣44。内邊緣42及外邊緣44彼此 0 相對。内邊緣42與内引腳36,之右侧及外引腳4〇，之右側連 接，外邊緣44與内引腳36,之左側及外引腳4〇，之左侧連接。 外邊緣44具有第-圓凹區5〇、第一圓凸區52以及第二圓凹 區54。第一圓凸區52位於第一圓凹區⑽與第二圓凹區舛之 ，。内邊緣42具有第二圓凸區56、第三圓凹區％以及第三 圓凸區60。第二圓凹區58位於第二圓凸區56與第三圓 60之間。 ^ 一土參照圖10，® 1〇為第一圓凸區52及第三圓凹區^之 不思圖。第-圓凸區52具有曲率半徑R1 ’第三圓凹區％具 9 201010549 /d .......... ioc/α 有曲率半徑R2 ’其中曲率半徑ri大於曲率半徑似。 參照圖Π ’圖11為根據本發明第二實施例之内引腳、 連接部38’及外引腳40’的示意圖。本實施例中，内邊緣42與 内引腳36’之左側及外引腳40,之左侧連接，外邊緣44與内引 腳36’之右侧及外引腳40’之右侧連接。 參照圖12’圖12為根據本發明第三實施例之内引腳％，、 連接部38’及外引腳40’的示意圖。本實施例中，内邊緣42與 魯 内引腳36’之右側及外引腳40’之右侧連接，外邊緣44與内引 腳36’之左側及外引腳40’之左侧連接。此外，外邊緣44另具 有位於第一圓凸區52與第二圓凹區54之間的第四圓凸區 53。本實施例中，連接第一圓凸區52與第四圓凸區53之中間 區55為一直線。然而，須注意的是，本發明並不以此為限。 舉例來說，中間區55可為另一圓凸區。 參照圖13 ’圖13為根據本發明第四實施例之内引腳％，、 連接部38’及外引腳40’的示意圖。本實施例中，内邊緣似與 内引腳36,之左侧及外引腳40,之左側連接，外邊緣44與内/引 ❹ 腳36’之右側及外引腳4〇’之右侧連接。此外’外邊緣44也具 有第四圓凸區53及中間區55。第四圓凸區53位於第一圓凸 區52與第二圓凹區54之間。 參照圖14’圖14為根據本發明第五實施例之内引腳％，、 連接部38’及外引腳40’的示意圖。本實施例中，内邊緣乜與 内引腳36,之右侧及外引腳40,之右侧連接，外邊緣44與内^ 腳36’之左側及外引腳40’之左侧連接。此外，内邊緣犯另具 有位於第三圓凹區58與第三圓凸區6〇之間的第四圓四^ 201010549^ 59。本實施例中，連接第三圓凹區58與第四圓凹區59之中間 區57為一直線。然而，須注意的是，本發明並不以此為限。 舉例來說，中間區57可為另一圓凹區。Thus, the present invention proposes a flexible circuit board. The flexible circuit board includes a flexible film, a plurality of (four) legs, a plurality of outer leads, and a plurality of connections 4. The inner leads are formed on the flexible film and each inner pin has a first width. The outer (four) is formed on the flexible (tetra) film, and each of the outer leads has a second width greater than the first width. Each connection is connected to its corresponding internal pin and its external-out-of-pin. At least one of the plurality of connecting portions has a rim and an outer edge. The outer edge has a first concave area, a second circular concave area, and a first circular convex area between the first circular concave area and the second circular concave area. The inner edge has a second circular convex region, a third circular convex region, and a third circular concave region between the second circular convex portion and the third circular convex portion. In the embodiment, the radius of curvature of the first circular convex region is larger than the radius of curvature of the second circular concave region. In the embodiment, the outer edge further includes a fourth circular convex region between the first circular convex region and the second circular concave region. In the actual closure of the present invention, the (four) edge is further in contact with the fourth circular recess between the third circular recess and the second circular convex region. = In the embodiment - the inner edge and the outer edge are opposite each other. In the embodiment of the invention, each of the inner edges of the other connecting portions and the rounded land portion and each of the other connecting portions; the edge has at least one concave portion and at least a rounded convex portion. 7 201010549 (10) In order to make the above features and advantages of the present invention more comprehensible, the following detailed description is in accordance with the accompanying drawings. [Embodiment] Referring to Figure 6', Figure 6 is a schematic view of a switchable circuit board 20 in accordance with a first embodiment of the present invention. The flexible circuit board 2G has a plurality of inner leads, a plurality of connecting portions 38, and a plurality of outer leads 4A. Each of the connections is connected to its corresponding inner pin 36 and its corresponding outer pin 4G. As shown in Figure 6, group 32 of connections 38 is located between group 3〇 of inner pins 36 and group 34 of outer pins 4〇. Each of the inner leads 36 has a first width and each outer lead 40 has a second width W2. The second width W2 is greater than the first width. According to other preferred embodiments of the present invention, the ratio of the second width W2 to the first width W1 is greater than or equal to three. However, the invention is not limited thereto. The inner lead 36 or the outer bow j foot 4〇 are parallel and equidistantly spaced. In other words, 'the domain of the four (four) feet 36 is between the two adjacent outer pins 4G along the first spacing 1^' along the first coordinate axis X. The second pitch D2 of the coordinate axis X. Further, the inner lead 36 and the outer lead 40 extend along the second coordinate axis γ. It should be noted that the spacing of the adjacent leads 36 or the outer leads of the present invention is not limited to any particular spacing. For example, the inner pin 36 or the outer pin 4〇 can be spaced apart at various intervals. See Figure 7 and Figure 8. 7 is a cross-sectional view of the flexible circuit board 2A along the line A-A of FIG. 6, and FIG. 8 is a cross-sectional view of the line segment along the B_B of FIG. The flexible circuit board 20 is further provided with a flexible 8 ioc/d 201010549 film 22 and a solder resist (SR) layer 24. In this embodiment, the flexible film 22 is made of polyimide and has a thickness of 38 mm. The inner lead 36 and the outer lead 40 are formed on the flexible film 22 and covered by the solder resist layer 24. Further, in the present embodiment, the inner lead 36, the connecting portion 38, and the outer lead 40 are made of copper metal and have a thickness of 5 mm to 2 mm. However, it should be noted that the above-described embodiments of the present invention are an example, and the present invention is not limited thereto. Referring again to FIG. 6, the connection portion 38 of the group 32 of the connection portions 38 is connected to the inner pin 36 of the group 30 of the inner pins 36, and the outer pin of the group 34 of the outer pins 40. 40,. Viewed along the first coordinate axis, the inner pin 36, in the range of positions on the first axis X, partially or entirely overlaps the position of the outer pin 4 on the first axis X. However, as seen along the second coordinate axis γ, the connecting portion 38' separates the inner lead 36' from the outer lead 4'. Referring to Fig. 9, Fig. 9 is an enlarged view of the vicinity of the connecting portion 38. The connecting portion 38 has an inner edge 42 and an outer edge 44. The inner edge 42 and the outer edge 44 are opposite each other. The inner edge 42 is connected to the inner side of the inner pin 36, the right side and the outer side of the pin 4'', and the outer side 44 is connected to the inner side of the inner lead 36, the left side and the outer side of the pin 4'. The outer edge 44 has a first recessed area 5〇, a first rounded area 52, and a second rounded area 54. The first circular convex region 52 is located in the first concave area (10) and the second concave area. The inner edge 42 has a second rounded area 56, a third recessed area %, and a third rounded area 60. The second dimple 58 is located between the second conical region 56 and the third circle 60. ^ One soil refers to Figure 10, and ® 1〇 is the first circular convex region 52 and the third circular concave region. The first circular convex portion 52 has a radius of curvature R1'. The third circular concave portion % has 9 201010549 /d ..... ioc / α has a radius of curvature R2 ' where the radius of curvature ri is larger than the radius of curvature. Referring to the drawings, Fig. 11 is a schematic view showing an inner lead, a connecting portion 38' and an outer lead 40' according to a second embodiment of the present invention. In this embodiment, the inner edge 42 is connected to the left side of the inner lead 36' and the left side of the outer lead 40, and the outer edge 44 is connected to the right side of the inner lead 36' and the right side of the outer lead 40'. Referring to Fig. 12', Fig. 12 is a schematic view showing the inner pin %, the connecting portion 38' and the outer pin 40' according to the third embodiment of the present invention. In this embodiment, the inner edge 42 is connected to the right side of the Lue pin 36' and to the right side of the outer lead 40', and the outer edge 44 is connected to the left side of the inner lead 36' and the left side of the outer lead 40'. In addition, the outer edge 44 has a fourth rounded region 53 located between the first circular convex portion 52 and the second concave portion 54. In this embodiment, the intermediate portion 55 connecting the first circular convex portion 52 and the fourth circular convex portion 53 is a straight line. However, it should be noted that the invention is not limited thereto. For example, the intermediate zone 55 can be another rounded zone. Referring to Fig. 13, there is shown a schematic view of an inner pin %, a connecting portion 38' and an outer pin 40' according to a fourth embodiment of the present invention. In this embodiment, the inner edge is connected to the left side of the inner lead 36, the left side and the outer side of the outer lead 40, and the outer side 44 is connected to the right side of the inner/lead leg 36' and the right side of the outer lead 4' connection. Further, the outer edge 44 also has a fourth circular convex portion 53 and an intermediate portion 55. The fourth circular convex portion 53 is located between the first circular convex portion 52 and the second circular concave portion 54. Referring to Fig. 14', Fig. 14 is a view showing the inner pin %, the connecting portion 38' and the outer pin 40' according to the fifth embodiment of the present invention. In this embodiment, the inner edge 连接 is connected to the right side of the inner lead 36, the right side and the outer side of the outer lead 40, and the outer edge 44 is connected to the left side of the inner side leg 36' and the left side of the outer lead 40'. In addition, the inner edge is further provided with a fourth circle 4 201010549^59 located between the third circular recess 58 and the third circular convex region 6〇. In this embodiment, the intermediate portion 57 connecting the third concave portion 58 and the fourth concave portion 59 is a straight line. However, it should be noted that the invention is not limited thereto. For example, the intermediate zone 57 can be another oblong zone.
參照圖15’圖15為根據本發明第六實施例之内引腳36，、 連接部38’及外引腳40’的示意圖。本實施例中，内邊緣42與 内引腳36’之左侧及外引腳40’之左側連接，外邊緣44與内引 腳36之右側及纟卜引腳40之右侧連接。此外，外邊緣44也具 有第四圓凸區53及中間區55，内邊緣42也具有第四圓凹區 59及中間區57。第四圓凸區53位於第一圓凸區52與第二圓 凹區54之間，第四圓凹區59位於第三圓凹區58與第三 區60之間。 參照圖16與圖17,圖16與圖17為其餘内引腳％、連 接部38及外引腳40的示意圖。除連接部38,之内邊緣似外， 其他連接部38之每個内邊緣42,都具有至少一圓凹區％及至 少-圓凸區56。此外，除連接部38，之外邊緣44外， 接部38之每個外邊緣44,都具有至少一圓凹區5〇及至 = 52=圖議Π所示’圓凹區5〇連接 圓 之弟一邊緣62,圓凸區52連接對應外弓丨腳4〇之第—邊判 此外’圓凸區56連接對應内引腳36之第二邊 :4。 58連接對應外引腳40之第二邊緣68。 、’ ’圓凹區 名：咖的，’在此文件中圓凹區所對應的科技專有 =:_(_」，而圓凸區所對應的= 名闷則為「外圓角（round)」。 竹筏專有 綜上所述，本發明因使用具有圓凹區及圓凸區的連接 11 u〇c/d 201010549 性電路板上’當可撓性電路板被料時，在連接 減=別=㈣腳及外引腳接合的㈣附近的機械應力得以 不只㈣腳與連接部之接合部因外力而斷裂 ==:且外引腳與連接部之接合部因外力而斷 —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’任何所屬技術賴巾具有通常知識者，在不 脫離本發明之精神和麵内，當可作些許之更動與潤飾， 因此本發明之傾範圍當視後附之_請專職目所界定者 為準。 【圖式簡單說明】 圖1是習知之一種電子裝置的橫切面示意圖。 圖2是習知之另一種電子裝置的橫切面示意圖。 圖3是圖1或圖2中電子裝置之顯示面板、pCB、驅 動1C及可撓性電路板的示意圖。 圖4是曰本公開專利應用所揭露之可撓性電路板的示 意圖。 圖5是圖4中可撓性電路板之導線的放大圖。 圖6是本發明第一實施例之可撓性電路板的示意圖。 圖7是圖6中沿著切線A-A，之可撓性電路板的橫切面 示意圖。 圖8是圖6中沿著切線B-B，之可撓性電路板的橫切面 示意圖。 12 201010549 圖9是圖6所示連接部附近之放大圖。 圖10是圖9所示第—圓凸區與第三圓凹區之示意圖。 圖11是根據本發明第二實施例之内引聊 “ 引腳的示賴。 银。丨汉r 圖12疋根據本發明第三實施例之内引腳、連接部及外 引腳的示意圖。 ° 圖13是根據本發明第四實施例之内弓丨腳、連接部及外 引腳的示意圖。 圖14是根據本發明第五實施例之内引腳、連接部及外 引腳的示意圖。 圖15是根據本發明第六實施例之内引腳、連接部及外 引腳的示意圖。 圖16與圖π是圖6所示其餘内引腳、連接部及外引腳 的示意圖 【主要元件符號說明】 ❹ la、4〇、4〇’ ：外引腳 lb、 36、36’ ：内引腳 lc、 38、38’ ：連接部 2 :凹口 2a ·内緣 2b :接合部 4、6:電子裝置 8:顯示面板 13 201010549 ίο :印刷電路板 12 :驅動1C 14、20 :可撓性電路板 16、18 :導線 22 :可撓性薄膜 24 :銲錫電阻層 30、32、34 :群組 42、42’ ：内邊緣 β 44、44’ ：外邊緣 50 :第一圓凹區 52 :第一圓凸區 53 :第四圓凸區 54 :第二圓凹區 55、57 :中間區 56 :第二圓凸區 58 :第三圓凹區 φ 59 :第四圓凹區 60 :第三圓凸區 62、64 :第一邊緣 66、68 :第二邊緣 Wl、W2 :寬度 Dl、D2 ··間隔 Rl、R2 :曲率半徑Referring to Fig. 15', Fig. 15 is a schematic view showing an inner lead 36, a connecting portion 38' and an outer lead 40' according to a sixth embodiment of the present invention. In this embodiment, the inner edge 42 is connected to the left side of the inner lead 36' and the left side of the outer lead 40', and the outer edge 44 is connected to the right side of the inner lead 36 and the right side of the inner lead pin 40. In addition, the outer edge 44 also has a fourth rounded region 53 and an intermediate portion 55. The inner edge 42 also has a fourth circular recess 59 and an intermediate portion 57. The fourth circular convex portion 53 is located between the first circular convex portion 52 and the second concave portion 54, and the fourth circular concave portion 59 is located between the third circular concave portion 58 and the third circular portion 58. Referring to Figures 16 and 17, Figures 16 and 17 are schematic views of the remaining inner pin %, the connecting portion 38, and the outer pin 40. Except for the connecting portion 38, the inner edge of the other connecting portion 38 has at least one concave area % and at least a round convex portion 56. In addition, except for the connecting portion 38, the outer edge 44, each outer edge 44 of the connecting portion 38 has at least one concave area 5 〇 and to = 52 = "图 区 〇 ' ' 〇 〇 〇 〇 〇 An edge 62, the circular convex portion 52 is connected to the first side of the outer bow foot 4, and the 'circular convex portion 56 is connected to the second side of the corresponding inner lead 36: 4. 58 is connected to the second edge 68 of the outer pin 40. , ' 'The name of the concave area: coffee, 'in this file, the technology corresponding to the concave area =: _ (_), and the corresponding area of the circular convex area = "boring" In addition, the present invention is based on the use of a connection having a concave and convex area and a rounded area 11 u〇c/d 201010549 on the circuit board 'When the flexible circuit board is received, the connection is made减=别=(4) The mechanical stress near the joint of the foot and the outer pin is not only (4) the joint between the foot and the joint is broken by the external force ==: and the joint between the outer pin and the joint is broken by the external force—although The present invention has been disclosed in the above preferred embodiments. However, it is not intended to limit the invention. Any of the skilled artisan will be able to make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention is defined by the appended claims. [Fig. 1 is a schematic cross-sectional view of a conventional electronic device. Fig. 2 is another electronic device of the prior art. Figure 3 is a display panel of the electronic device of Figure 1 or Figure 2, p Figure 4 is a schematic view of a flexible circuit board disclosed in the patent application of the present disclosure. Figure 5 is an enlarged view of the wire of the flexible circuit board of Figure 4. 6 is a schematic view of a flexible circuit board according to a first embodiment of the present invention. Fig. 7 is a cross-sectional view of the flexible circuit board taken along line AA of Fig. 6. Fig. 8 is a tangential line BB in Fig. 6. Fig. 9 is an enlarged view of the vicinity of the connecting portion shown in Fig. 6. Fig. 10 is a schematic view of the first circular convex portion and the third circular concave portion shown in Fig. 9. Fig. 11 is a schematic view of the cross section of the flexible circuit board. According to the second embodiment of the present invention, the description of the pin is shown in Fig. 12. The schematic diagram of the inner pin, the connecting portion and the outer pin according to the third embodiment of the present invention. 13 is a schematic view of the inner leg, the connecting portion and the outer pin according to the fourth embodiment of the present invention. Fig. 14 is a view showing the inner pin, the connecting portion and the outer pin according to the fifth embodiment of the present invention. It is a schematic diagram of an inner pin, a connecting portion and an outer pin according to a sixth embodiment of the present invention. 16 and Figure π are schematic diagrams of the remaining inner leads, connections and outer leads shown in Figure 6. [Main component symbol description] ❹ la, 4〇, 4〇': external pins lb, 36, 36': internal reference Foot lc, 38, 38': connection portion 2: notch 2a, inner edge 2b: joint portion 4, 6: electronic device 8: display panel 13 201010549 ίο: printed circuit board 12: drive 1C 14, 20: flexibility Circuit board 16, 18: wire 22: flexible film 24: solder resistance layer 30, 32, 34: group 42, 42': inner edge β 44, 44': outer edge 50: first circular recess 52: First circular convex area 53: fourth circular convex area 54: second circular concave area 55, 57: intermediate area 56: second circular convex area 58: third circular concave area φ 59: fourth circular concave area 60: Three circular convex regions 62, 64: first edges 66, 68: second edges W1, W2: width D1, D2 · interval Rl, R2: radius of curvature