JP3013433B2 - Wiring connection structure and electro-optical device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring connection structure using a flexible wiring connection member such as a flexible printed circuit and an electro-optical device using the wiring connection structure.

[Conventional technology]

For example, as a wiring connection member between components in a liquid crystal display device or the like, a flexible printed circuit (hereinafter, referred to as FPC) in which wiring is provided on a flexible base film made of synthetic resin or the like is used. In particular, between a liquid crystal display panel and a drive control circuit board in a liquid crystal display device, a flexible chip in which a semiconductor chip for driving a liquid crystal such as an LSI is mounted on the above FPC by a TAB (Tape Automated Bonding) method or the like. A flexible wiring connection member is used, and the flexible wiring connection member and the liquid crystal display panel are conductively connected via an anisotropic conductive film (anisotropic conductive adhesive) or the like.

[Problems to be solved by the invention]

However, in the flexible wiring connection member as described above, for example, a plurality of input / output wiring groups for one semiconductor chip are set as one unit, and a plurality of input / output wiring groups are provided in parallel on the base film. In the case where the wiring group is electrically connected to another member, for example, a liquid crystal display panel by an anisotropic conductive film or the like, if there is an interval between the adjacent wiring groups, the wiring group becomes adjacent when the above-described conductive connection is performed. Distortion or the like is likely to occur in the base film between the wiring groups. In particular, when the flexible wiring connection member is bent and attached, stress concentrates between the wiring groups and the base film tends to float, and line missing (poor connection) occurs in the wiring in the vicinity. There was a risk that the resistance value would increase.

An object of the present invention is to solve the above-mentioned conventional problems with a simple configuration.

[Means for solving the problem]

In order to achieve the above object, a wiring connection structure and an electro-optical device according to the present invention have the following configurations.

That is, in the wiring connection structure according to the present invention, a plurality of wiring groups are formed on the base film of the flexible wiring connection member, and the wiring groups are electrically connected to other members via the anisotropic conductive film. In the wiring connection structure, the plurality of wiring groups are formed by forming dummy wirings on the base film between adjacent wiring groups in a portion conductively connected to the substrate via an anisotropic conductive film. Features.

Further, in the electro-optical device according to the present invention, a plurality of wiring groups are formed on the base film of the flexible wiring connection member, and the wiring groups are electrically connected to the substrate of the electro-optical device via the anisotropic conductive film. In the electro-optical device configured to be connected, in the portion where the plurality of wiring groups are conductively connected to the substrate via an anisotropic conductive film, dummy wirings are provided on the base film between the adjacent wiring groups. It is characterized by having been formed.

(Operation)

By providing dummy wiring on the base film between the adjacent wiring groups as described above, when the wiring group is conductively connected to another member by an anisotropic conductive film or the like, the adjacent wiring group It is possible to prevent the base film between them from being deformed or lifted due to shape retention by the dummy wiring.

〔Example〕

Hereinafter, the wiring connection structure and the electro-optical device according to the present invention will be specifically described by taking, as an example, a case where a liquid crystal display panel and a drive control circuit board in a liquid crystal display device are connected via a flexible wiring connection member.

FIG. 1 is a plan view showing an example of a flexible wiring connection member used in the wiring connection structure according to the present invention, and FIGS. 2 and 3 are a liquid crystal display panel and a drive control circuit using the flexible wiring connection member. It is a side view in the state where it connected with a substrate.

The flexible wiring connection member 1 of the illustrated example has two sets of wiring groups 12 and 12 formed on a flexible base film 11 made of a synthetic resin or the like, and the inner lead portion of each wiring group 12 is provided with an LSI or the like. Of the semiconductor chip 13 for driving liquid crystal of TAB (Tape Automated Bond
ing) This is a configuration implemented by a method or the like.

The dummy wirings 14 are formed on the base film 11 between the wiring groups 12 and 12. In the case of the drawing, the wiring groups 12 are substantially parallel to and substantially equal to the end of the wiring group 12 on the connection side with the liquid crystal display panel 2. And the opposite ends are integrally connected. The shape of the dummy wiring 14 may be any other suitable shape such as a parallel linear shape over the entire length. The material of the dummy wiring 14 is also appropriate, but it is preferable to use a copper foil or the like of the same material as the wiring group 12 and to form the dummy wiring 14 at the same time as forming the wiring group 12.

In the above configuration, when the flexible wiring connection member 1 is conductively connected to the liquid crystal display panel 2 or the like, each wiring group 12
And an anisotropic conductive film (not shown) is continuously adhered to the end of the dummy wiring 14 and terminals (not shown) on the substrate 21 of the liquid crystal display panel 2 as shown in FIGS. FIG. 2 shows an example in which the wiring group is set inside, and FIG. 3 shows an example in which the wiring group is set outside. Although the flexible wiring connection member 1 and the drive control circuit board 3 are connected by soldering or the like in this example, they may be connected in the same manner as described above.

By providing the dummy wirings 14 on the base film between the adjacent wiring groups 12 and 12 as described above, the base film therebetween is reinforced, distortion and floating are prevented, and reliable conductive connection can be achieved. .

In the illustrated example, the one having two sets of wiring groups on one flexible wiring connection member is illustrated, but the present invention can be applied to the one having three or more sets of wiring groups. Further, the present invention is also applicable to a device in which the bonding surface of the semiconductor chip on the flexible wiring connection member is formed on the back side, or a device in which a semiconductor chip or the like is not mounted on the flexible wiring connection member.

Further, although the embodiment is applied to the liquid crystal display device, it can be applied to, for example, a plasma display, an EL display, and various other electro-optical devices. In particular, it is effective for multi-pin high-density terminal connection.

〔The invention's effect〕

As described above, according to the present invention, since dummy wiring is provided on the base film between adjacent wiring groups, when the wiring group is conductively connected to another member by an anisotropic conductive film or the like,
It is possible to easily and surely prevent the substrate film between the adjacent wiring groups from being deformed or raised due to the shape retention by the dummy wiring. In addition, by extending the dummy wiring over the bent portion of the flexible wiring connection member, the bent portion is reinforced, and it is possible to prevent the disconnection of the wiring group at the bent portion, thereby providing a stable wiring connection. There are effects such as that the structure and the electro-optical device can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a flexible wiring connection member used in the wiring connection structure according to the present invention, and FIGS. 2 and 3 show a state in which conductive connection is performed using the flexible wiring connection member. It is a side view. 1 is a flexible wiring connection member, 11 is a base film, 12 is a wiring group, 13 is a semiconductor chip, 14 is a dummy wiring, 2 is a liquid crystal display panel, and 3 is a drive control circuit board.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 1/14 G02F 1/1345

Claims (8)

(57) [Claims] 1. A wiring connection structure in which a plurality of wiring groups are formed on a base film of a flexible wiring connecting member, and the wiring groups are conductively connected to other members via an anisotropic conductive film. A wiring in which the plurality of wiring groups are conductively connected to another member via an anisotropic conductive film, wherein dummy wirings are formed on the base film between the adjacent wiring groups. Connection structure. 2. The wiring connection structure according to claim 1, wherein said dummy wirings are formed substantially in parallel with and substantially at the same pitch as the connection side end of said wiring group with said another member. 3. A plurality of dummy wirings are formed between adjacent wiring groups at connection-side ends of the wiring groups, and ends of the plurality of dummy wirings opposite to the connection-side ends are integrally formed. The wiring connection structure according to claim 1, wherein the wiring connection structure is connected to the wiring connection structure. 4. The wiring according to claim 1, wherein the dummy wiring extends from a connection side end of the wiring group to a bent portion of the flexible wiring connection member. Connection structure. 5. A plurality of wiring groups are formed on a base film of a flexible wiring connection member, and these wiring groups are conductively connected to a substrate of an electro-optical device via an anisotropic conductive film. In the electro-optical device, the dummy wirings may be formed on the base film between the adjacent wiring groups at a portion where the plurality of wiring groups are conductively connected to the substrate via an anisotropic conductive film. Electro-optical device characterized. 6. The electro-optical device according to claim 5, wherein the dummy wirings are formed substantially in parallel with the end of the wiring group on the connection side with the substrate and at substantially the same pitch. 7. A plurality of dummy wirings are formed between adjacent wiring groups at connection-side ends of the wiring groups, and ends of the plurality of dummy wirings opposite to the connection-side ends are integrally formed. The electro-optical device according to claim 5, wherein the electro-optical device is connected to the electro-optical device. 8. The electric device according to claim 5, wherein the dummy wiring extends from a connection end of the wiring group to a bent portion of the flexible wiring connection member. Optical device.