JP3052954B2 - Electrical connection structure and liquid crystal device - Google Patents
Electrical connection structure and liquid crystal deviceInfo
- Publication number
- JP3052954B2 JP3052954B2 JP11043929A JP4392999A JP3052954B2 JP 3052954 B2 JP3052954 B2 JP 3052954B2 JP 11043929 A JP11043929 A JP 11043929A JP 4392999 A JP4392999 A JP 4392999A JP 3052954 B2 JP3052954 B2 JP 3052954B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal portion
- liquid crystal
- terminal
- electrical connection
- terminals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 15
- 239000000758 substrate Substances 0.000 claims description 10
- 238000002788 crimping Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Combinations Of Printed Boards (AREA)
- Liquid Crystal (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は特に高密度、多端子
のＬＣＤパネル実装等に利用するフレキシブルプリント
基板（以下ＦＰＣと略す）の電気的接続構造及び液晶装
置に関するものである。
【０００２】
【従来の技術】従来、ＦＰＣの接続端子群は液晶パネル
の外部回路との接続用の端子取出部と相対向して形成さ
れ、電気的接続がなされていた。
【０００３】
【発明が解決しようとする課題】従来のＦＰＣは全端子
が有効接続端子として使用されていたため、ＦＰＣのベ
ースフィルムと例えばガラス基板の熱膨張係数の違いに
よる応力が生じた場合、最外端の接続端子が断線を起こ
し、即座に欠陥を引き起こしてしまう欠点があった。そ
こで、本発明では応力等による断線を防止し、接続信頼
性の高いＦＰＣ及び液晶表示装置を得ることを目的とし
ている。
【０００４】
【課題を解決するための手段】本発明の電気的接続構造
は、端子部を有するフレキシブルプリント基板と、端子
部を有する基板とを、両端子部を対向させ異方性導電膜
を介して圧着によって電気的接続してなる電気的接続構
造であって、前記フレキシブルプリント基板の端子部に
は、前記フレキシブルプリント基板の端子部と前記基板
の端子部との電気的接続に寄与しないダミー端子が、当
該端子部における有効接続端子部の両外側に配置され、
かつ、前記ダミー端子は、各前記外側にそれぞれ同数個
配置されていることを特徴とする。
【０００５】また、本発明の液晶装置は、端子部を有す
るフレキシブルプリント基板と、端子部を有する液晶パ
ネルの基板とを、両端子部を対向させ異方性導電膜を介
して圧着によって電気的接続してなる液晶装置であっ
て、前記フレキシブルプリント基板の端子部には、前記
フレキシブルプリント基板の端子部と前記液晶パネルの
基板の端子部との電気的接続に寄与しないダミー端子
が、当該端子部における有効接続端子部の両外側に配置
され、かつ、 前記ダミー端子は、各前記外側にそれぞ
れ同数個配置されていることを特徴とする。
【０００６】
【発明の実施の形態】〔実施例〕本発明を図面に基づい
て説明すると図１はＦＰＣベースフィルム側からみたも
のであり、図２はその断面図である。１は液晶パネル端
子取出部、２は異方性導電膜、３はベースフィルム、４
は有効接続端子、５はダミー端子である。
【０００７】このようにダミー端子５を設けた場合に
は、ベースフィルム３と液晶パネル端子取出部の熱膨張
係数の違いによりせん断応力が生じても、最外端のダミ
ー端子５に負荷がかかり内側の有効接続端子４には負荷
がかからない。また、補強部材であるダミー端子を有効
接続端子と同一材質としたことにより、工程を増やすこ
となく容易に補強ができる。その上、材質の違いによる
ストレスの影響を最小にできるという効果を有してい
る。
【０００８】図３は圧着時における効果を説明する図で
あり、ヒーターヘッド６により熱圧着される状態を示し
ている。ヒーターヘッド６の平坦度が理論的平面で平行
に押された場合には、端部、中央部共に同一であると考
えられるが、ヒーターヘッド６が熱変形で凹面となる場
合では端部端子に応力が集中して電気的安定接続を難し
くする。このような場合でもダミー端子５ａ，５ｂ，５
ｃが存在すれば内部の有効接続端子４は電気的安定接続
を保てる。したがって、有効接続端子部の外側両端部も
中心部と同じような接続が可能になり、有効接続端子部
の全面において圧着均一性が増大するという効果を有す
る。
【０００９】図４はダミー端子５ａ，５ｂ，５ｃの代わ
りにＦＰＣ上のレジスト材７で同様の機能を持たせたも
のである。
【００１０】図５の実装構造はＬＳＩチップ８をＡｎ−
Ｓｎ共晶等でＦＰＣに接続し、有効接続端子４と液晶パ
ネルの端子取出部１とを異方性導電膜２を介して電気的
接続を行った構造である。
【００１１】図６の実装構造は図５での方法を更に高密
度にした方法であり、液晶パネル端子取出部１上にＬＳ
Ｉチップ８を搭載したＦＰＣを異方性導電膜を介して電
気的接続を行った構造である。
【００１２】図５、図６の実装構造は多端子、多チップ
で１台の製品となるため、接続端子の外側両端部の安定
接続により累乗的に歩留まりが良くなることになる。
【００１３】
【発明の効果】以上説明したように、ＦＰＣの接続端子
群の有効接続端子部の外側両端部で、かつ、各外側同数
個ずつダミー端子を配置したことにより、基板同士の熱
膨張係数の違いにより生じる外側両端部での電気的オー
プンを防止し、接続信頼性の高い電気的接続構造が得ら
れる。また、有効接続端子部の外側両端も中心部と同じ
ような接続が可能であり、均一な接続強度を有し、有効
接続端子部の全面において圧着均一性が増大するという
効果を有している。
【００１４】したがって、ＦＰＣを大型化、多端子化し
た時等に生じる熱膨張係数の違いによる応力による不良
を低減できる。また、機械的剥離力に対しても強く、信
頼性の高い電気的接続が可能である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connection structure of a flexible printed circuit board (hereinafter abbreviated as FPC) and a liquid crystal, which are used particularly for mounting a high-density, multi-terminal LCD panel. It concerns the device. 2. Description of the Related Art Conventionally, a group of connection terminals of an FPC has been formed so as to face a terminal extraction portion for connection to an external circuit of a liquid crystal panel, and has been electrically connected. [0003] In the conventional FPC, all terminals are used as effective connection terminals. Therefore, when a stress is generated due to a difference in the thermal expansion coefficient between the base film of the FPC and, for example, a glass substrate, the maximum is required. There is a drawback that the connection terminal at the outer end is disconnected and causes a defect immediately. Therefore, an object of the present invention is to prevent disconnection due to stress or the like and obtain an FPC and a liquid crystal display device with high connection reliability. [0004] An electrical connection structure according to the present invention comprises a flexible printed circuit board having terminals and a substrate having terminals. An electrical connection structure that is electrically connected by crimping through the terminal, wherein the terminal portion of the flexible printed board has a dummy that does not contribute to the electrical connection between the terminal portion of the flexible printed board and the terminal portion of the board. Terminals are arranged on both outer sides of the effective connection terminal portion in the terminal portion,
Further, the same number of the dummy terminals are arranged on each of the outer sides. In the liquid crystal device according to the present invention, a flexible printed circuit board having terminals and a substrate of a liquid crystal panel having terminals are electrically connected to each other by pressure bonding with both terminals facing each other via an anisotropic conductive film. A liquid crystal device comprising: a terminal portion of the flexible printed circuit board; a dummy terminal that does not contribute to electrical connection between the terminal portion of the flexible printed circuit board and the terminal portion of the substrate of the liquid crystal panel; Wherein the same number of the dummy terminals are arranged on each of the outer sides of the effective connection terminal section. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a view from the side of an FPC base film, and FIG. 2 is a cross-sectional view thereof. 1 is a liquid crystal panel terminal extraction portion, 2 is an anisotropic conductive film, 3 is a base film, 4
Is an effective connection terminal, and 5 is a dummy terminal. When the dummy terminals 5 are provided in this manner, even if a shear stress is generated due to a difference in the thermal expansion coefficient between the base film 3 and the liquid crystal panel terminal extraction portion, a load is applied to the outermost dummy terminals 5. No load is applied to the inner effective connection terminal 4. Further, since the dummy terminal as the reinforcing member is made of the same material as the effective connection terminal, the reinforcement can be easily performed without increasing the number of steps. In addition, it has the effect of minimizing the effect of stress due to differences in materials. FIG. 3 is a view for explaining the effect at the time of pressure bonding, and shows a state in which the pressure bonding is performed by the heater head 6. When the flatness of the heater head 6 is pressed in parallel on a theoretical plane, it is considered that both ends and the center are the same. However, when the heater head 6 becomes concave due to thermal deformation, it is connected to an end terminal. Stress concentrates and makes electrical stable connection difficult. Even in such a case, the dummy terminals 5a, 5b, 5
If c exists, the internal effective connection terminal 4 can maintain an electrically stable connection. Therefore, the outer ends of the effective connection terminal can be connected in the same manner as the center, and the uniformity of crimping can be increased over the entire surface of the effective connection terminal. FIG. 4 shows a structure in which a resist material 7 on an FPC has a similar function in place of the dummy terminals 5a, 5b and 5c. The mounting structure shown in FIG.
The structure is such that the connection is made to the FPC with Sn eutectic or the like, and the effective connection terminal 4 and the terminal extraction portion 1 of the liquid crystal panel are electrically connected via the anisotropic conductive film 2. The mounting structure shown in FIG. 6 is a method in which the method shown in FIG.
This is a structure in which an FPC on which an I chip 8 is mounted is electrically connected via an anisotropic conductive film. Since the mounting structure shown in FIGS. 5 and 6 constitutes one product with multiple terminals and multiple chips, the yield is improved by a power by the stable connection of the outer ends of the connection terminals. As described above, by arranging the dummy terminals at both ends on the outer side of the effective connection terminal portion of the connection terminal group of the FPC and the same number of dummy terminals on each outer side, the thermal expansion between the substrates can be achieved. Electrical open at both outer ends caused by the difference in coefficient is prevented, and an electrical connection structure with high connection reliability is obtained. In addition, the both ends on the outer side of the effective connection terminal portion can be connected in the same manner as the center portion, have uniform connection strength, and have the effect of increasing the uniformity of crimping over the entire surface of the effective connection terminal portion. . Therefore, it is possible to reduce defects due to stress caused by a difference in thermal expansion coefficient when the FPC is enlarged and the number of terminals is increased. Further, it is strong against mechanical peeling force, and highly reliable electrical connection is possible.
【図面の簡単な説明】
【図１】 本発明のベースフィルム側から見た図。
【図２】 本発明の実施例の断面図。
【図３】 本発明の圧着工程図。
【図４】 本発明のダミー端子５をレジスト材７に置き
換えた図。
【図５】 本発明の他の実施例を示す図。
【図６】 本発明の他の実施例を示す図。
【符号の説明】
１．液晶パネル端子取出部
２．異方性導電膜
３．ベースフィルム
４．有効接続端子
５．ダミー端子
６．ヒーターヘッド
７．レジスト材
８．ＬＳＩチップBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view seen from a base film side of the present invention. FIG. 2 is a sectional view of an embodiment of the present invention. FIG. 3 is a pressure-bonding process diagram of the present invention. FIG. 4 is a diagram in which a dummy terminal 5 of the present invention is replaced with a resist material 7; FIG. 5 is a view showing another embodiment of the present invention. FIG. 6 is a diagram showing another embodiment of the present invention. [Explanation of Codes] 1. LCD panel terminal extraction section 2. Anisotropic conductive film Base film4. Effective connection terminal 5. Dummy terminal 6. Heater head7. Resist material8. LSI chip
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H05K 1/14 G02F 1/1345 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H05K 1/14 G02F 1/1345
Claims (1)
部を有する基板とを、両端子部を対向させ異方性導電膜
を介して圧着によって電気的接続してなる電気的接続構
造であって、 前記フレキシブルプリント基板の端子部には、前記フレ
キシブルプリント基板の端子部と前記基板の端子部との
電気的接続に寄与しないダミー端子が、当該端子部にお
ける有効接続端子部の両外側に配置され、かつ、 前記ダミー端子は、各前記外側にそれぞれ同数個配置さ
れていることを特徴とする電気的接続構造。 ２．端子部を有するフレキシブルプリント基板と、端子
部を有する液晶パネルの基板とを、両端子部を対向させ
異方性導電膜を介して圧着によって電気的接続してなる
液晶装置であって、 前記フレキシブルプリント基板の端子部には、前記フレ
キシブルプリント基板の端子部と前記液晶パネルの基板
の端子部との電気的接続に寄与しないダミー端子が、当
該端子部における有効接続端子部の両外側に配置され、
かつ、 前記ダミー端子は、各前記外側にそれぞれ同数個配置さ
れていることを特徴とする液晶装置。(57) [Claims] An electrical connection structure in which a flexible printed board having a terminal portion and a substrate having a terminal portion are electrically connected to each other by crimping with both terminal portions facing each other via an anisotropic conductive film, In the terminal portion of the substrate, dummy terminals that do not contribute to the electrical connection between the terminal portion of the flexible printed board and the terminal portion of the substrate are arranged on both outer sides of the effective connection terminal portion in the terminal portion, and An electrical connection structure, wherein the same number of dummy terminals are arranged on each of the outer sides. 2. A liquid crystal device comprising: a flexible printed circuit board having a terminal portion; and a liquid crystal panel substrate having a terminal portion, wherein both the terminal portions are opposed to each other and electrically connected by crimping via an anisotropic conductive film. In the terminal portion of the printed circuit board, dummy terminals that do not contribute to the electrical connection between the terminal portion of the flexible printed circuit board and the terminal portion of the substrate of the liquid crystal panel are arranged on both outer sides of the effective connection terminal portion in the terminal portion. ,
A liquid crystal device, wherein the same number of the dummy terminals are arranged on each of the outer sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11043929A JP3052954B2 (en) | 1999-02-22 | 1999-02-22 | Electrical connection structure and liquid crystal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11043929A JP3052954B2 (en) | 1999-02-22 | 1999-02-22 | Electrical connection structure and liquid crystal device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9294042A Division JP2940532B2 (en) | 1997-10-27 | 1997-10-27 | Electrical connection structure and liquid crystal device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000-7810A Division JP3246499B2 (en) | 1985-11-08 | Electrical connection structure and liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11317575A JPH11317575A (en) | 1999-11-16 |
| JP3052954B2 true JP3052954B2 (en) | 2000-06-19 |
Family
ID=12677394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11043929A Expired - Lifetime JP3052954B2 (en) | 1999-02-22 | 1999-02-22 | Electrical connection structure and liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3052954B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4251129B2 (en) | 2004-10-25 | 2009-04-08 | セイコーエプソン株式会社 | Mounting structure, electro-optical device, and electronic apparatus |
| JP4603522B2 (en) | 2006-09-25 | 2010-12-22 | エプソンイメージングデバイス株式会社 | Mounting structure, electro-optical device, and electronic apparatus |
-
1999
- 1999-02-22 JP JP11043929A patent/JP3052954B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11317575A (en) | 1999-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000307 |