JPH03271791A - Drive circuit mounting structure in liquid crystal display devices, etc. - Google Patents

Abstract

PURPOSE:To allow the dealing with fine patterns by providing the input terminals of the electrodes on an electrode substrate in correspondence to the output wirings in three directions on a flexible wiring connecting member. CONSTITUTION:The flexible wiring connecting member 3 formed by packaging an IC chip 4 on a flexible wiring substrate 30 and disposing the output wirings 3b of the IC chip 4 in the three directions is so disposed on the electrode substrate 1B that the IC chip 4 is positioned on the electrode substrate 1B, such as liquid crystal display panel. The electrode input terminal part 12a on the electrode substrate 1B and the output wiring 3b are connected by, for example, an anisotropic conductive adhesive, etc. The output wirings 3b of the IC chip 4 are disposed in the three directions on the flexible wiring connecting member 30 and the electrode input terminal art 12a on the electrode substrate 1B connected thereto is provided in correspondence to the output wiring 3b. The sufficient dealing with the finer patterns is possible in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure of a drive circuit in a liquid crystal display device or the like.

[Conventional technology]

For example, various configurations have been proposed as mounting structures for drive circuits in liquid crystal display devices.

Figures 2(a) and 2(b) show an example of a drive circuit mounting structure in a conventional liquid crystal display device.
is a liquid crystal display panel, with transparent electrodes 11 and 1 on the opposite side.
In this structure, a liquid crystal layer 13 is interposed between a pair of upper and lower electrode substrates IA and 18 on which electrodes 2 are disposed, and its peripheral portion is sealed with a sealing member 14.

2 is a circuit board for controlling the drive of the liquid crystal panel 1, and 3 is a so-called FPC (Flexible Pr) connecting the circuit board 2 and the transparent electrode 12 on the lower electrode board IB.
It is a flexible wiring connection member such as nt C1rcuit.

The flexible wiring connection member 3 connects an IC chip 4 for driving a liquid crystal such as an LSI to a so-called TAB (Tape Auto).
(sated bonding) method, and the IC
Input/output wiring 3 for input/output terminals 4a and 4b of chip 4
a and 3b are applied on a sheet-like flexible wiring board 30 made of polyimide resin or the like. The above input wiring 3a is connected to the circuit board 2, and the output wiring 3b is connected to the input terminal portion 12a of the transparent electrode 12 on the electrode substrate IB using anisotropic conductive adhesives 6a, 6b, etc., respectively.

However, in recent liquid crystal display devices, for example, the number of electrodes on the electrode substrate has increased and the electrode patterns have become finer due to colorization and higher density on both sides of the display. Input/output wiring 3a on the flexible wiring connection member 3
3b, especially the pitch of the output wiring 3b, has also tended to become finer, but conventionally, the output wiring and the electrode input terminal portions on the electrode substrate connected thereto have been arranged linearly in one direction. There are problems such as not being able to sufficiently respond to the above-mentioned fine patterning.

Furthermore, as shown in FIGS. 3(a) and 3(b), for example, a so-called COG (Chip On Glare) method is used, in which an IC chip 4 is placed directly on an electrode substrate IB made of glass or the like.
sS) implementation method has also been proposed. In this type of mounting method, the electrode input terminal portion 12a on the electrode substrate IB is connected to a rectangular I
The output terminals 4b provided on the three sides of the C chip 4 are wired and electrically connected using a conductive adhesive or the like, and the input terminals 4a formed on the other side of the IC chip 4 are connected to the electrode substrate. Conductive connection is made to the connection wiring 15 provided on the IB in the same manner as above. Then, the connection wiring 15 and the control circuit board 2 are connected by a flexible wiring connection member 31 such as an FPC. 30 is a flexible wiring board of the connecting member 31;
31a indicates connection wiring.

Although the above-mentioned mounting method can cope with the above-mentioned fine patterning, it has disadvantages such as the need for one more connection part for IC input wiring and the need for an extra flexible wiring connection member.

[Problem to be solved by the invention]

The present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to obtain a drive circuit mounting structure for a liquid crystal display device, etc., which can sufficiently cope with the above-mentioned fine patterning, has a simple structure, and is easy to assemble. With the goal.

[Means to solve the problem]

In order to achieve the above object, a drive circuit mounting structure in a liquid crystal display device or the like according to the present invention has the following configuration.

That is, an IC chip is mounted on a flexible wiring board, and its I
A flexible wiring connection member having output wiring of a C chip arranged in three directions is placed on an electrode substrate such that the IC chip is positioned on the electrode substrate of a liquid crystal display panel, etc. It is characterized in that the output wiring arranged on the output wiring and the input terminal portion of the electrode on the electrode substrate wired corresponding thereto are electrically conductively connected.

[For production]

With the above configuration, an IC chip is mounted in advance on a flexible wiring board using, for example, the TAB method, and a flexible wiring connection member, which is formed by providing input/output wiring for the IC chip, is placed on an electrode board and connected to the flexible wiring connection member. The electrode input terminal portion on the substrate and the output wiring can be connected, for example, by an anisotropic conductive adhesive. Also I
The output wiring of the C chip is arranged in three directions on a flexible wiring board, and the electrode input terminals on the electrode board connected thereto are provided in correspondence with the output wiring, which is sufficient for the above-mentioned fine patterning. It becomes possible to correspond to

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1(a) is a perspective view showing an example of a drive circuit mounting structure in a liquid crystal display device according to the present invention, FIG. 1(b) is a longitudinal sectional view of the main part, and FIG. 1(c) is a flexible wiring connection member. FIG. 2 is a plan view of the conventional example, in which members having the same functions as those of the conventional example are designated by the same reference numerals and repeated explanations will be omitted.

The flexible wiring connection member 3 is made of a so-called FPC in which wiring 3a and 3b are formed with copper foil or the like on one side of a flexible wiring board 3o made of a sheet-like synthetic resin such as polyimide resin. An IC chip 4 for driving a liquid crystal such as an LSI is mounted in the TAB method, so-called COF (Chi
p On Film). Input wiring 3a for the IC chip 4 is formed in one direction, and output wiring 3b is formed in three directions.

The electrode input terminal portion 12a on the electrode substrate IB connected to the output wiring 3b is formed facing the output wiring 3b formed in the three directions as shown in FIG. An electrically conductive connection is made using an anisotropic conductive adhesive 6b.

On the other hand, a PCB (Print
A control circuit board 2 such as C1rcuit Board) is integrally fixed to the lower surface of the lower electrode board IB by a fixing means such as an adhesive 7, and the input wiring 3a is anisotropically conductive bonded to the circuit board 2. Reference numeral 30a in FIG. 3 indicates a notch portion of the substrate 30 formed at the curved portion of the flexible wiring connection member 3, which is connected by a bonding agent 6a or the like.

The structure of the flexible wiring connection member 3 to the upper electrode substrate IA in FIG. 1 and the connection structure between the output wiring and the electrode 11 on the upper electrode substrate IA are the same as those of the lower electrode substrate IB.
The input wiring of the flexible wiring connection member is connected to the circuit board 2 via the relay flexible wiring connection member 32 that commonly connects the input wiring of adjacent flexible wiring connection members. It is connected to the.

Further, although the embodiments have been described using a liquid crystal display device as an example, the present invention can also be applied to a plasma display, an EL display, a thermal head, etc., and is particularly effective in the field of multi-pin high-density terminal connection.

[Effects of the Invention] As explained above, since the drive circuit mounting structure in a liquid crystal display device or the like according to the present invention has the above-described configuration, input/output wiring of the IC chip is performed in advance and T
A flexible wiring connection member on which an IC chip is mounted using the AB method or the like is placed on an electrode substrate, and an anisotropic conductive adhesive or the like is applied to the input terminal portion of the electrode on the electrode substrate with the output wiring corresponding thereto. By making a conductive connection, it can be easily assembled and mass-produced at low cost. In addition, since the output wiring on the flexible wiring connection member is arranged in three directions, and the input terminals of the electrodes on the electrode substrate connected thereto are provided corresponding to the output wiring in the three directions, the fine pattern It has the advantage of being able to fully respond to changes in the environment.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing an example of a drive circuit mounting structure in a liquid crystal display device according to an embodiment of the present invention, and FIG.
) is a vertical sectional view of the main part, FIG. 2(c) is a plan view of the flexible wiring connection member, and FIGS. 2(a) and 2(b) are examples of drive circuit mounting structures in conventional liquid crystal display devices, etc. FIGS. 3(a) and 3(b) are a perspective view and a longitudinal sectional view of another conventional example. 1 is a liquid crystal panel, IA and IB are electrode substrates, 11 and 12 are electrodes, 12a is an input terminal section, 2 is a circuit board, 3 is a flexible wiring connection member, 30 is a flexible wiring board, and 3a is an input wiring , 3b is the output wiring, and 4 is the IC chip. Figure 2 (Q) Figure 2 (b)

Claims (1)

[Claims] (1) Mount an IC chip on a flexible wiring board, and
A flexible wiring connection member having output wiring of a C chip arranged in three directions is placed on an electrode substrate such that the IC chip is positioned on the electrode substrate of a liquid crystal display panel, etc. 1. A drive circuit mounting structure for a liquid crystal display device, etc., characterized in that an output wiring arranged on the substrate is electrically conductively connected to an input terminal portion of an electrode on an electrode substrate wired correspondingly to the output wiring.