JP2001005020A - Structure for connecting electrode terminals of liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent electrode terminals from peeling off a flexible wiring board even when stress is applied to the flexible wiring board, by sticking reinforcing plates so that the connection part of an anisotropic conductive material is at least partly coated with the reinforcing plates positioned on both sides of the connecting part to the electrode terminals of the flexible wiring board. SOLUTION: An edge part of a flexible wiring board 4 is connected with an electrode terminal part 3 via an anisotropic conductive material 5. Further, on both side positions of the edge part of the flexible wiring board 4, reinforcing plates 6 are stuck so as to partly coat the part stuck by the anisotropic conductive material 5 on the flexible wiring board 4 with them. Therefore, the stress applied to the boundary part between the flexible wiring board 4 and the anisotropic conductive material 5 is distributed by the reinforcing plates 6, and concentrated on the end edge parts of the reinforcing plates 6. Therefore, even though stress is applied to the flexible wiring board 4, the stress is not directly applied to the connection part by the anisotropic conductive material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting electrode terminals of a liquid crystal display panel, and more particularly to a structure for connecting electrode terminals of a liquid crystal display panel to a flexible wiring board. About.

[0002]

2. Description of the Related Art Generally, a liquid crystal display panel for selectively applying an electric field to display information such as specific figures and characters is provided on a predetermined portion of two transparent substrates filled with liquid crystal in the middle. Liquid crystal display devices are widely used.

In such a liquid crystal display panel, a pair of substrates made of glass or the like are arranged facing each other,
Transparent electrodes made of indium tin oxide (hereinafter referred to as ITO) or the like are laminated on the surfaces of these substrates facing each other. On the surface of the substrate on which the transparent electrode is formed, an alignment film having a rubbing treatment on the surface is laminated to arrange liquid crystal molecules in a predetermined form between the electrodes facing each other.

[0004] A sealing material is applied to one peripheral portion of the two substrates which have been subjected to such orientation treatment, and a spacer for adjusting a gap between the substrates is provided in a plane surrounded by the sealing material. The substrates are bonded together in a state of being uniformly scattered so as to be integrally formed. Furthermore, after injecting a liquid crystal from an injection port provided in advance between the respective substrates, the injection port is sealed to seal the liquid crystal between the two substrates. Then, by attaching a polarizing plate to the surface of each of these substrates, a liquid crystal display panel is constituted.

In such a liquid crystal display panel, one of a pair of substrates is formed to be larger than the other substrate, and a protruding portion of the larger substrate is provided with a portion for taking out a transparent electrode. Is formed.
That is, a large number of electrode terminals connected to the transparent substrate are arranged at a predetermined pitch in the take-out portion of the substrate.

[0006] Then, a flexible wiring board having a desired wiring pattern formed on an electrode terminal formed at a portion where the electrode is taken out is connected to an anisotropic conductive film or a UV curable resin mixed with conductive particles. Are connected via the anisotropic conductive material.

[0007]

However, in the above-described connection structure of the wiring substrate in the conventional liquid crystal display panel, the connection strength between the electrode terminals and the flexible wiring board depends on the adhesive strength of the anisotropic conductive material. Therefore, there is a problem that the connection strength is insufficient. Therefore, when a liquid crystal display panel to which a flexible printed circuit board is connected is incorporated into the mechanism, and the end of the flexible printed circuit board is fitted into a connector, or in extreme cases, when holding the liquid crystal display panel, the flexible printed circuit should be used instead of the board. When a large stress such as pulling or bending is applied to the connection portion of the flexible wiring board, such as when holding the board, a peeling force is applied to the connection portion of the flexible wiring board. Have a problem in that they are separated from the electrode terminals, resulting in poor connection between the flexible wiring board and the electrode terminals.

Conventionally, in order to prevent the flexible wiring board from peeling off, it has been necessary to reinforce the connection portion of the flexible wiring board with a clip or a tape after connecting the flexible wiring board.

The present invention has been made in view of these points, and a liquid crystal display capable of reliably preventing the flexible wiring board from being separated from the electrode terminals even when stress is applied to the flexible wiring board. It is an object of the present invention to provide an electrode terminal connection structure for a panel.

[0010]

According to a first aspect of the present invention, there is provided an electrode terminal connection structure for a liquid crystal display panel, comprising: an electrode terminal formed on the liquid crystal display panel; a flexible wiring board; Is connected and fixed via an anisotropic conductive material in the electrode terminal connection structure of the liquid crystal display panel. A reinforcing plate is fixed so as to cover at least a part thereof.

According to the first aspect of the present invention, since the reinforcing plates are fixed so as to cover at least a part of the connection portion of the flexible wiring board with the anisotropic conductive material, the flexible wiring board is provided. The stress applied to the boundary between the substrate and the anisotropic conductive material is dispersed by the reinforcing plate, and concentrates on the edge of the reinforcing plate. Therefore, even when stress is applied to the flexible wiring board, no direct stress is applied to the connection portion made of the anisotropic conductive material, and peeling of the flexible wiring board can be reliably prevented. Things.

The invention described in claim 2 is the first invention.
, Wherein the reinforcing plate is fixed in advance to a corresponding portion of the flexible wiring board.

According to the second aspect of the present invention, since the reinforcing plate is fixed to the corresponding portion of the flexible wiring board in advance, the connection by the reinforcing plate can be achieved only by connecting the flexible wiring board to the electrode terminals. It is possible to reinforce the connection portion, and it is possible to easily reinforce the connection portion with higher work efficiency than in the case where the connection portion is reinforced with a clip or a tape as in the related art.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 show an embodiment of an electrode terminal connection structure of a liquid crystal display panel according to the present invention. The liquid crystal display panel 1 is made of glass or the like and arranged to face each other. A transparent electrode (not shown) made of ITO or the like is formed on a surface of each of the substrates 2 facing each other. Then, on the surface of the substrate 2 on which the transparent electrodes are formed, an alignment film (not shown) having a rubbing treatment applied to the surface in order to arrange the liquid crystal molecules in a certain form between the electrodes facing each other is laminated. Is formed. A sealing material (not shown) is applied to one peripheral portion of the two substrates 2 that have been subjected to such orientation processing, and a gap between the substrates 2 is adjusted in a plane surrounded by the sealing material. The substrates 2 are attached to each other in a state in which the spacers are uniformly dispersed. Further, after injecting liquid crystal from the injection port provided beforehand between the respective substrates 2, the liquid crystal is sealed between the two substrates 2 by sealing the injection port, and the liquid crystal display panel 1 Is configured.

In such a liquid crystal display panel 1, one substrate 2 of the liquid crystal display panel 1 is formed larger than the other substrate 2. As shown in FIG. 2, a large number of electrode terminals 3, 3... Drawn from the transparent electrode are formed at a predetermined pitch.

The distal end of the flexible wiring board 4 is connected to the electrode terminals 3 by an anisotropic conductive material 5 such as an anisotropic conductive film or a UV curable resin mixed with conductive particles. I have. In this case, the anisotropic conductive material 5
In the case where an anisotropic conductive film is used, the flexible wiring substrate 4 is superposed on the electrode terminal 3 via the anisotropic conductive film, and the flexible wiring substrate 4 is pressurized and heated, so that the flexible wiring The substrate 4 is thermocompression-bonded. When a UV curable resin is used as the anisotropic conductive material 5, the UV curable resin is cured by irradiating ultraviolet rays in a state where the flexible wiring board 4 is overlapped with the electrode terminals 3 via the UV curable resin. The electrode terminal 3
, The flexible wiring board 4 is fixed thereto.

Further, in the present embodiment, the reinforcing plate is provided on both sides of the front end portion of the flexible wiring board 4 so as to cover a part of the adhesive portion of the flexible wiring board 4 with the anisotropic conductive material 5. The reinforcing plates 6 are fixed to the reinforcing plates 6, and any material that does not easily deform may be a metal or an insulator.
In this case, in the present embodiment, the reinforcing plate 6
The flexible wiring board 4 is fixed to a corresponding portion in advance.

Next, the operation of the present embodiment will be described.

Normally, when a large stress is applied to the connection portion of the flexible wiring board 4, the stress is applied most to the boundary portion between the flexible wiring board 4 and the anisotropic conductive material 5. However, in the present embodiment, since the reinforcing plate 6 is fixed to both sides of the distal end portion of the flexible wiring board 4, as described above, the boundary between the flexible wiring board 4 and the anisotropic conductive material 5 is formed. Is distributed by the reinforcing plate 6 and concentrated on the edge portion of the reinforcing plate 6. Therefore, the flexible wiring board 4
Even if stress is applied to the connection portion, no direct stress is applied to the connection portion by the anisotropic conductive material 5,
The peeling of the flexible wiring board 4 can be reliably prevented.

Therefore, in the present embodiment, the reinforcing plate 6 is fixed to both sides of the distal end portion of the flexible wiring board 4, and the reinforcing plate 6 is provided at the boundary between the flexible wiring board 4 and the anisotropic conductive material 5. Since the applied stress can be dispersed so that the stress is not directly applied to the connection part by the anisotropic conductive material 5, peeling of the flexible wiring board 4 can be reliably prevented, and connection by peeling of the flexible wiring board 4 can be prevented. Defects can be reliably prevented.

Further, in this embodiment, the reinforcing plate 6 is fixed to the corresponding portion of the flexible wiring board 4 in advance, so that only the flexible wiring board 4 is connected to the electrode terminals 3 and the reinforcing plate 6 is used. The connection portion can be reinforced, and the connection portion can be reinforced easily with higher working efficiency as compared with the conventional case in which the connection portion is reinforced with a clip, a tape, or the like.

The present invention is not limited to the above embodiment, but can be variously modified as needed.

[0024]

As described above, in the electrode terminal connection structure of the liquid crystal display panel according to the first aspect of the present invention, the stress applied to the boundary between the flexible wiring board and the anisotropic conductive material is dispersed by the reinforcing plate. Even if stress is applied to the flexible wiring board,
By preventing direct stress from being applied to the connection part by the anisotropic conductive material, peeling of the flexible wiring board can be reliably prevented, and connection failure due to peeling of the flexible wiring board can be reliably prevented. it can.

According to the second aspect of the present invention, since the reinforcing plate is fixed to the corresponding portion of the flexible wiring board in advance, only the connection of the flexible wiring board to the electrode terminal can be performed. Reinforcement can be performed, and compared with the conventional case of reinforcing with a clip, tape, or the like, there is an effect that work efficiency is improved and the connection portion can be easily reinforced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of an electrode terminal connection structure of a liquid crystal display panel according to the present invention.

FIG. 2 is an explanatory view showing a side view of the electrode terminal connection structure shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Substrate 3 Electrode terminal 4 Flexible wiring board 5 Anisotropic conductive material 6 Reinforcement board

Claims (2)

[Claims] 1. An electrode terminal connection structure for a liquid crystal display panel for connecting and fixing an electrode terminal formed on a liquid crystal display panel and a flexible wiring board via an anisotropic conductive material, wherein An electrode terminal connection structure for a liquid crystal display panel, wherein a reinforcing plate is fixed to both sides of the connection portion to the electrode terminal so as to cover at least a part of the connection portion by the anisotropic conductive material. 2. The electrode terminal connection structure according to claim 1, wherein the reinforcing plate is fixed to a corresponding portion of the flexible wiring board in advance.