JPH0843843A - Liquid crystal display device and its production - Google Patents

Abstract

PURPOSE:To execute exchange of ICs for driving liquid crystals without damaging liquid crystal display element terminals and terminal electrodes by providing the output terminals of a film carrier with outflow preventive materials having resilience. CONSTITUTION:The output terminals 2 of the film carrier to be connected to the liquid crystal display element are provided with the outflow preventive materials 11 consisting of rubber members, etc., and having the flexibility at the side ends of the protective films 3 thereof. The outflow preventive materials 11 are arranged to face the end faces of the terminal electrodes 8 formed on the liquid crystal display terminals 7 and, therefore, the flow of the resin 6a in anisotropic conductive films into the spacings between the terminal electrodes 8 and the liquid crystal display terminals 7 is prevented at the time when a heating and pressurizing tool 10 is pressed onto the org. insulating film 1 of the film carrier from above the film. Consequently, the peeling of the terminal electrodes 8 and the element terminals 7 does not arise any more even if the film carrier is pulled apart from the glass substrate 9 at the time of exchanging the ICs for driving liquid crystals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and its manufacturing method.

[0002]

2. Description of the Related Art A method of manufacturing a liquid crystal display device by connecting a liquid crystal display element and a liquid crystal driving IC with the increase in screen size and definition of a liquid crystal display element is the same as in the conventional method. From a method of manufacturing by connecting by a bonding method and connecting it to a liquid crystal display element with heat seal, zebra rubber, etc., a liquid crystal driving IC is mounted on a film carrier, and it is used as a liquid crystal display element by using an anisotropic conductive film. The method of connecting and manufacturing is changing.

FIG. 6 shows a conventional liquid crystal display element and a liquid crystal driving I.
The example of the film carrier used for connection with C is shown.
In FIG. 6, 1 is an organic insulating film such as polyimide or polyester, 2 is a conductive metal foil such as copper foil or copper-based alloy foil formed by photolithography technique, and is connected to an input terminal of a liquid crystal display element. An output terminal of the film carrier, 13 is formed of a conductive metal foil such as a copper foil or a copper-based alloy foil using a photolithography technique, and an input terminal of the film carrier for connecting with a drive signal supply substrate, 3 is the output terminal 2 and a protective film for protecting the input terminal 13 of the film carrier formed by applying, for example, an epoxy solder resist, 4 is a mold resin, and 14 is a liquid crystal driving IC sealed with the mold resin 4. , The output terminal 2 of the film carrier and the input terminal 13 of the film carrier are connected.

A method for connecting the film carrier and the liquid crystal display device is shown in FIGS. 7 and 8. Here, FIG. 7 is an explanatory view of the connection between the film carrier and the liquid crystal display element when the direction of the output terminal portion of the film carrier is seen from the input terminal portion of the liquid crystal display element, and FIG. 8 is AA of FIG. It is a part of line sectional drawing. The end surface of the input terminal portion of the liquid crystal display element is in a state where the terminal electrode 8 and the liquid crystal display element terminal 7 are turned up during the chamfering process to form a gap (size of about several μm). Shows the state exaggeratedly.

The above method is as follows. First, as shown in FIG.
As shown in (a), for example, an anisotropic conductive film 6 formed by dispersing conductive particles 6b plated with metal on the surface of a polymer core in an epoxy resin 6a is formed on a liquid crystal display element terminal 7. Then, the output terminal 2 of the film carrier and the terminal electrode array of the liquid crystal display element are aligned with each other. Next, as shown in FIG. 7B, the heating and pressing tool 10 is pressed against the organic insulating film 1 of the film carrier to press and deform the conductive particles 6b in the anisotropic conductive film 6, and both contact surfaces are The terminal electrode 8 formed on the output terminal 2 of the film carrier and the liquid crystal display element terminal 7 in close contact with each other.
Electrically conduct. Then, the resin 6a in the anisotropic conductive film 6 is cured to mechanically fix the resin.

In this method, when the output terminal 2 of the film carrier and the terminal electrode array of the liquid crystal display element are aligned and heated and pressed, the resin 6a in the anisotropic conductive film is liquefied and has fluidity. Therefore, as shown in FIG. 8B, the resin 6a in the anisotropic conductive film flows out to the terminal electrode 8, the liquid crystal display element terminal 7 and the glass substrate 9, and at this time, the input terminal portion of the liquid crystal display element During chamfering of the end face, the resin in the anisotropic conductive film is also formed in the gap formed between the terminal electrode 8 and the liquid crystal display element terminal 7 and the gap formed between the liquid crystal display element terminal 7 and the glass substrate 9. 6a flows in and hardens as it is.

As a result, when the film carrier is peeled off as shown in FIG. 7C due to a failure of the liquid crystal driving IC after connecting the liquid crystal display element and the film carrier, as shown in FIG. 8C. There is a problem that the liquid crystal display element terminal 7 and the terminal electrode 8 are peeled off from the glass substrate 9 together with the film carrier, so that the liquid crystal display element cannot be used.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a liquid crystal display device in which the liquid crystal driving IC can be easily replaced due to a failure of the liquid crystal driving IC and a manufacturing method thereof. Is.

[0009]

According to the present invention, an input terminal portion of a liquid crystal display element having a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and a liquid crystal driving IC are arranged. An output terminal of the IC, wherein an output terminal of the IC is formed on one surface of the film provided, and an end portion is exposed on the output terminal to form a protective film.
A protective film of the film carrier for connecting the film carrier to the liquid crystal display element when manufacturing the liquid crystal display device by melting and connecting the resin through an anisotropic conductive film composed of conductive particles and resin Of the outflow-preventing material having a flexibility on the exposed portion of the output terminal in contact with the side end of the output terminal, and bringing the free end of the outflow-preventing material into contact with the terminal electrode end surface of the input terminal portion. The present invention relates to a method for manufacturing a characteristic first liquid crystal display device.

Further, in the present invention, it is preferable that the flow preventive agent having flexibility is a rubber material.

Further, according to the present invention, a film is formed by disposing an input terminal portion of a liquid crystal display element having a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and a liquid crystal driving IC. Form the output terminal of the IC on one side of
An output terminal portion of a film carrier having an end portion exposed on the output terminal and a protective film formed thereon is connected to the output terminal portion by thermally melting the resin through an anisotropic conductive film made of conductive particles and a resin. In manufacturing the liquid crystal display device, the film carrier is produced by thickly forming a side end portion of a flexible protective film of the film carrier which is connected to the liquid crystal display element, and the thick side end is formed. A second liquid crystal display device manufacturing method, characterized in that the free end of the portion is brought into contact with the end surface of the terminal electrode of the input terminal portion.

Further, according to the present invention, an input terminal portion of a liquid crystal display element having a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and a film single side on which a liquid crystal driving IC is arranged. The output terminal of the film carrier having the output terminal of the IC formed on the output terminal and the protective film formed on the output terminal with the end of the output terminal exposed is made of conductive particles and resin. In a liquid crystal display device connected via an anisotropic conductive film, the film carrier is in contact with a side end portion of a protective film of the film carrier connected to the liquid crystal display element, and on the exposed portion of the output terminal. The first liquid crystal display device is characterized in that the outflow prevention material having flexibility is joined and provided, and the free end of the outflow prevention material is in contact with the end surface of the terminal electrode of the input terminal portion. .

Furthermore, the present invention is a film in which an input terminal portion of a liquid crystal display element having a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate and a liquid crystal driving IC are arranged. The output terminal of the IC formed on one surface of the substrate and the output terminal portion of the film carrier having a protective film formed by exposing the end portion of the output terminal on the output terminal are made of conductive particles and resin. In a liquid crystal display device connected via an anisotropic conductive film consisting of, the side edges of a flexible protective film of the film carrier connected to the liquid crystal display element are thickly formed on the film carrier. The present invention relates to a second liquid crystal display device, wherein a free end of the thickly formed side end portion is in contact with an end surface of a terminal electrode of the input terminal portion.

[0014]

In the first liquid crystal display device of the present invention, the outflow prevention material having flexibility on the exposed portion of the output terminal of the film carrier in contact with the side end portion of the protective film of the film carrier connected to the liquid crystal display element. Are bonded to each other, and the free end of the outflow prevention material is in contact with the end surface of the terminal electrode of the input terminal portion of the liquid crystal display element. Since the structure does not flow into the gap, the liquid crystal driving IC can be replaced without inducing separation of the terminal electrode or the liquid crystal display element terminal.

The present invention is also the method for manufacturing the first liquid crystal display device, wherein a flexible flow-out preventing material is bonded on the exposed portion of the output terminal of the film carrier, and the end surface of the terminal electrode is joined to the end surface. The abutting has a function of preventing the resin in the anisotropic conductive film used for the connection from flowing into the gap.

Further, the present invention is the method for manufacturing the first liquid crystal display device using a rubber material as the flexible outflow preventing material, which has a function of preventing the resin from flowing into the gap. .

Further, in the second liquid crystal display device of the present invention, the side edge of the flexible protective film of the film carrier connected to the liquid crystal display element is formed thick and is provided. Since the free end of the portion is in contact with the end surface of the terminal electrode of the input terminal portion of the liquid crystal display element, the resin in the anisotropic conductive film used for the connection has a structure that does not flow into the gap. The liquid crystal driving IC can be replaced without inducing separation of the terminals of the liquid crystal display element.

Furthermore, the present invention is a method for manufacturing the second liquid crystal display device, which is produced by forming a thick side end portion of the flexible protective film of the film carrier, and the side end portion. By bringing the free end of the above into contact with the end face of the terminal electrode, there is a function of preventing the resin in the anisotropic conductive film used for the connection from flowing into the gap.

The flexibility means preventing the terminal electrode from being broken when the free end or the free end of the protective film having a thick side end portion of the outflow prevention material is brought into contact with the end face of the terminal electrode. The flexibility is required to secure the free end to the end face of the terminal electrode evenly when the output terminal of the film carrier and the terminal electrode array of the liquid crystal display element are aligned. The flexibility required to obtain the resin can be ensured, and the resin in the anisotropic conductive film can be prevented from flowing out by making sure contact.

[0020]

EXAMPLES Next, the liquid crystal display device of the present invention and the manufacturing method thereof will be explained based on examples, but the present invention is not limited to these.

[Embodiment 1] FIG. 1 is a view for explaining a film carrier in a first liquid crystal display device of the present invention. Further, FIG. 1B is a cross-sectional view taken along the line AA in FIG.

In FIG. 1, 1 is an organic insulating film such as polyimide or polyester, 2 is an output terminal of a film carrier in which a conductive metal foil such as a copper foil or a copper base alloy foil is formed by a photolithography technique, 3 Is a protective film for protecting the output terminal 2 of the film carrier and the input terminal 13 of the film carrier, and 14 is a liquid crystal driving IC, which is a mold resin 4 such as an epoxy resin.
Is a resin-sealed material, and 11 is an outflow prevention material having flexibility, which is in contact with the side end portion of the protective film of the film carrier connected to the liquid crystal display element and is joined to the exposed portion of the output terminal.

4 and 5 show the procedure for connecting the film carrier and the liquid crystal display element and the state when peeled off. As shown in FIG. 5A, the film carrier has a flexible flow-out preventing material which is in contact with a side end portion of a protective film of the film carrier which is connected to the liquid crystal display element and which is bonded on the exposed portion of the output terminal. 11 is provided. By placing this material 11 against the end surface of the terminal electrode 8 as shown in FIG. 5B, the heating and pressing tool 10 is placed on the organic insulating film 1 of the film carrier. It is possible to prevent the resin 6a in the anisotropic conductive film from flowing into the gap between the terminal electrode 8 and the liquid crystal display element terminal 7 when pressed from above.

As a result, as shown in FIG. 5C, the liquid crystal driving IC can be easily replaced due to a failure of the liquid crystal driving IC without inducing separation of the terminal electrode 8 or the liquid crystal display element terminal 7. Can be achieved.

Examples of the material for the protective film having flexibility include epoxy-based solder resist and polyimide film. The flexibility (deflection) of the tape,
A solder resist is preferable in terms of bendability.

Examples of the method of forming the protective film include a screen printing method.

The flexibility means that when the heating and pressing tool 10 is pressed against the organic insulating film 1 of the film carrier as shown in FIG. (The material) prevents the terminal electrode 8 from being destroyed, and the outflow preventing agent 11 is surely brought into contact with the end face of the terminal electrode 8 even if there is a slight misalignment between the output terminal 2 and the terminal electrode 8. The flexibility you need to get,
It is possible to prevent the resin 6a in the anisotropic conductive film from flowing out.

Examples of the outflow prevention material 11 having flexibility include silicone rubber, urethane rubber, natural rubber rubber material, epoxy resin, polyimide resin, and the like because they have elasticity. A rubber material such as silicone rubber, urethane rubber, or natural rubber is preferable. The thickness of the conductive particles 6b in the anisotropic conductive film 6 is in order to prevent the resin 6a in the anisotropic conductive film 6 from flowing into the gap between the terminal electrode 8 and the liquid crystal display element terminal 7. It is preferable to set it to be equal to or less than the total amount of the thickness of the terminal electrode 8.

As a method of bonding the flexible outflow prevention material 11 to the film carrier, a method of applying a resin or the like by a dispenser, a method of screen printing, or a plate-like elastic material is directly bonded by an adhesive or the like. Examples of the method include a method using a dispenser and a screen printing method from the viewpoint of production throughput.

The anisotropic conductive film means metal particles (N
i), molten metal (solder) particles, and conductive particles such as plastic beads plated with Ni / Au,
Particles of the same kind are dispersed in an insulating adhesive resin to form a film.

[Embodiment 2] FIG. 2 shows an example of a film carrier using a rubber material 5 which is also flexible as an outflow preventing material having flexibility in the first liquid crystal display device and the manufacturing method thereof according to the present invention. It is a diagram for explanation and the same effect as that of the first embodiment can be obtained.

Examples of the rubber material include silicone rubber, urethane rubber and natural rubber.

Examples of the method of adhering the rubber material to the film carrier include a method of applying a resin or the like by a dispenser, a method of screen printing, and a method of directly joining a plate-shaped elastic material with an adhesive or the like. From the viewpoint of manufacturing throughput, a method using a dispenser or a screen printing method is preferable.

[Embodiment 3] FIG. 3 is a view for explaining a second liquid crystal display device of the present invention and a film carrier having a flexible protective film having thick side edges in the manufacturing method thereof. And an example of a flexible protective film 12 having thick side edges of a protective film for protecting the output terminal 2 and the input terminal 13 formed on the film carrier connected to the liquid crystal display element side, Not only can the same effects as those of Examples 1 and 2 be obtained, but the step of joining the flow-out prevention material 11 having flexibility and the like can be omitted.

As a method of thickening the side end portion of the protective film, for example, double coating by a screen printing method or coating by a dispenser can be mentioned. The thickness of the resin 6a in the anisotropic conductive film 6 is equal to that of the terminal electrode 8 and the liquid crystal display element terminal 7.
In order to prevent the particles from flowing into the above-mentioned gap between and, it is preferable to set the particle diameter of the conductive particles 6b in the anisotropic conductive film and the thickness of the terminal electrode 8 to the total amount or less.

[0036]

The first liquid crystal display device of the present invention is provided with a flexible outflow preventing material, and is used for replacing the liquid crystal driving IC due to a failure of the liquid crystal driving IC or the like, when the liquid crystal driving IC is replaced with a terminal or a terminal of the liquid crystal display element. It can be easily performed without inducing peeling of the electrode.

The first method of manufacturing a liquid crystal display device of the present invention comprises:
It is possible to manufacture a liquid crystal display device that does not induce the peeling by using a flexible outflow prevention material.

Further, according to the first method for manufacturing a liquid crystal display device of the present invention, it is possible to manufacture a liquid crystal display device which does not induce the peeling, by using a rubber material as the outflow preventing material having flexibility. .

The second liquid crystal display device of the present invention is provided with a flexible protective film having thick side edges, and the liquid crystal drive IC is damaged due to failure of the liquid crystal drive IC.
Can be easily replaced without inducing separation of the liquid crystal display device terminals or terminal electrodes.

The second method for manufacturing a liquid crystal display device of the present invention is
A liquid crystal display device that does not induce the peeling can be manufactured by using a flexible protective film having thick side edges.

[Brief description of drawings]

FIG. 1A is a side view of a film carrier in Example 1, and FIG. 1B is a sectional view taken along line AA of FIG.

2A is a side view of a film carrier according to a second embodiment, and FIG. 2B is a sectional view taken along line AA of FIG.

FIG. 3A is a side view of a film carrier in Example 3, and FIG. 3B is a sectional view taken along line AA of FIG.

FIG. 4 is an explanatory diagram showing a method of connecting the film carrier and the liquid crystal display element in Example 1 when the direction of the output terminal portion of the film carrier is viewed from the input terminal portion of the liquid crystal display element.

5 is a cross-sectional view taken along the line AA of FIG. 4 for explaining the method of connecting the film carrier and the liquid crystal display element in Example 1. FIG.

6A is a side view of a conventional film carrier, and FIG. 6B is a sectional view taken along line AA of FIG.

FIG. 7 shows an explanatory view of a conventional method of connecting a film carrier and a liquid crystal display element when the direction of the output terminal portion of the film carrier is viewed from the input terminal portion of the liquid crystal display element.

8 is a cross-sectional view taken along the line AA of FIG. 7 for explaining a conventional method of connecting a film carrier and a liquid crystal display element.

[Explanation of symbols]

1 organic insulating film of film carrier, 2 output terminal of film carrier, 3 protective film of output terminal and input terminal of film carrier, 4 mold resin, 5
Rubber material, 6 anisotropic conductive film, 6a resin in anisotropic conductive film, 6b conductive particles in anisotropic conductive film, 7 liquid crystal display element terminal, 8 terminal electrode formed on liquid crystal display element terminal, 9 glass substrate, 10 heating and pressing tool, 11 flexible outflow prevention material, 12 protective film with thick side edges, 13 film carrier input terminals, 14 liquid crystal driving IC sealed with mold resin, 15 bumps (electrode terminals).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Morishita 997 Miyoshi, Nishigoshi Town, Kikuchi District, Kumamoto Prefecture Advanced Display Company

Claims (5)

[Claims] 1. An input terminal portion of a liquid crystal display element comprising a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and one side of a film provided with a liquid crystal driving IC. An output terminal portion of a film carrier, which forms an output terminal of the IC, and has a protective film formed by exposing the end portion of the output terminal, and an anisotropic conductive film made of conductive particles and a resin. When the liquid crystal display device is manufactured by heat-melting and connecting the resin, the film carrier is brought into contact with the side end portion of the protective film of the film carrier connected to the liquid crystal display element, and the exposed portion of the output terminal is exposed. A method for manufacturing a liquid crystal display device, characterized in that a flow-out prevention material having flexibility is bonded to the upper portion of the input terminal portion, and a free end of the flow-out prevention material is brought into contact with an end surface of a terminal electrode of the input terminal portion. 2. The method for manufacturing a liquid crystal display device according to claim 1, wherein the outflow preventing agent having flexibility is a rubber material. 3. An input terminal portion of a liquid crystal display element comprising a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and one side of a film provided with a liquid crystal driving IC. The IC output terminal is formed, and an output terminal portion of a film carrier, in which an end portion is exposed on the output terminal and a protective film is formed, and an output terminal portion of a film carrier are provided through an anisotropic conductive film made of conductive particles and a resin. When manufacturing a liquid crystal display device by heat-melting and connecting the resin, the film carrier is produced by forming thick side edges of a flexible protective film of the film carrier that is connected to the liquid crystal display element. Then, the method of manufacturing a liquid crystal display device, characterized in that the free end of the thickened side end portion is brought into contact with the end surface of the terminal electrode of the input terminal portion. 4. An input terminal portion of a liquid crystal display element comprising a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and formed on one side of a film on which a liquid crystal driving IC is arranged. An output terminal portion of the film carrier having an output terminal of the IC and a protective film formed on the output terminal with the end portion of the output terminal exposed.
In a liquid crystal display device connected through an anisotropic conductive film made of conductive particles and a resin, the film carrier is brought into contact with a side end portion of a protective film of the film carrier connected to the liquid crystal display element. A liquid crystal display characterized in that an outflow prevention material having flexibility is joined and provided on an exposed portion of the terminal, and a free end of the outflow prevention material is in contact with an end surface of a terminal electrode of the input terminal portion. apparatus. 5. An input terminal portion of a liquid crystal display element comprising a liquid crystal display element terminal and a terminal electrode formed on the terminal on a glass substrate, and formed on one side of a film on which a liquid crystal driving IC is arranged. The output terminal of the IC and the output terminal of the film carrier having a protective film formed by exposing the end of the output terminal on the output terminal are made of conductive particles and resin. In a liquid crystal display device connected via a conductive conductive film, the film carrier is provided with a thick side end portion of a flexible protective film of the film carrier connected to the liquid crystal display element. A liquid crystal display device characterized in that the free end of the thickened side end portion is in contact with the end surface of the terminal electrode of the input terminal portion.