JP3284175B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display, and more particularly to a method for manufacturing a liquid crystal display using a plastic electrode substrate.

[0002]

2. Description of the Related Art As a general method of manufacturing a liquid crystal display device, there is a method in which a pair of electrode substrates on which an electrode pattern, an alignment film and the like are formed are bonded together via a sealing material, and divided into individual liquid crystal display panels. Used.

In a method of manufacturing a plastic liquid crystal display device using a plastic substrate as an electrode substrate, since the plastic substrate has flexibility, a pair of electrode substrates are bonded together via a sealing material, and then each of the liquid crystal display panels is provided. During the manufacturing process before dividing and injecting, the sealing material is easily peeled off from the electrode substrate.

In order to prevent the peeling of the seal, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-20478, a dummy seal pattern is provided in a region other than the liquid crystal display panel on the electrode substrate, and a plastic liquid crystal display device is provided. Techniques for preventing peeling of a seal have been proposed.

[0005]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open Publication No. 7-2
Although the technology disclosed in Japanese Patent No. 0478 has the effect of suppressing the peeling of the seal, it can completely prevent the peeling of the seal due to warpage and bending of the plastic substrate due to heating in the manufacturing process of the liquid crystal display device. Have difficulty.

Further, since the plastic substrate has flexibility, it is inherently difficult to control the thickness of a liquid crystal layer enclosed between a pair of electrode substrates, that is, the so-called cell gap, and it is also necessary to provide a high definition and high resolution to recent liquid crystal display devices. Due to the demand for contrast and the like, it is necessary to control the cell gap with extremely high precision.

Further, in order to reduce the cost, it is necessary to increase the number of liquid crystal display panels manufactured from a pair of electrode substrates, that is, the number of the liquid crystal display panels. The area where the seal pattern can be formed has become narrower, and the purpose of preventing peeling of the seal has not been sufficiently achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems. Even when a plastic substrate is used as an electrode substrate, it is possible to prevent peeling of a seal during a manufacturing process, and to reduce a cell gap. It is an object of the present invention to provide a method for manufacturing a liquid crystal display device that can make the uniformity.

[0009]

According to a first aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising the steps of: forming a pair of plastic electrode substrates with a seal pattern of a liquid crystal display panel; In the method for manufacturing a liquid crystal display device in which an unnecessary region is separated by dividing the substrate with a dummy seal pattern and separated by a dividing line to obtain a liquid crystal display panel, the pair of electrode substrates are bonded to each other.
Before the dummy seal pattern has a thickness of 30
In μm and a line width of 0.2 to 0.6mm thickness of the component
The outer region of the cross-sectional line, across the dividing line adjacent
3 to 6 parallel straight lines in a 10 mm width without
Together are a comprise formation, 1 to 15 the distance between the outermost end of the dummy seal pattern and the end portion of the electrode substrate
mm, the distance between the seal pattern of the liquid crystal display panel and the dummy seal pattern adjacent to the seal pattern of the liquid crystal display panel is 2 to 10 mm ,
After bonding the pair of electrode substrates, the dummy seal
Turn is characterized Rukoto compressed to a thickness of 6 [mu] m.

[0010]

[0011]

[0012]

According to the method of manufacturing a liquid crystal display device of the present invention, by forming the dummy seal patterns at a density of 3 to 6 per 10 mm, peeling of the seal during the manufacturing process can be prevented, and the cell gap can be reduced. It can be controlled with high precision.

Further, by forming the line width of the dummy seal pattern with a thickness of 0.2 to 0.6 mm, the peeling of the seal during the manufacturing process can be further prevented, and the cell gap can be controlled with high precision. be able to.

Preferably, the distance between the end of the electrode substrate and the outermost end of the dummy seal pattern is 1 to 15 mm.

It is preferable that the distance between the seal pattern of the liquid crystal display panel and the dummy seal pattern adjacent to the seal pattern of the liquid crystal display panel is 2 to 10 mm.

[0017]

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

FIG. 1 is a plan view showing a seal pattern and a dummy seal pattern of a liquid crystal display panel, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1.

First, the dummy seal pattern 1 will be described.

The dummy seal pattern 1 is formed in a region on the electrode substrate 2 where the seal pattern 3 of the liquid crystal display panel is not formed.

The material of the dummy seal pattern 1 may be different from the material of the seal pattern 3 of the liquid crystal display panel, but is preferably the same. Dummy seal pattern 1 and seal pattern 3 for liquid crystal display panel
Is the same material, for example, the dummy seal pattern 1 and the seal pattern 3 of the liquid crystal display panel can be simultaneously formed by one screen printing.

As with the seal pattern 3 of the liquid crystal display panel, a spacer may be mixed in the seal material in the dummy seal pattern 1.

In this embodiment, the width of the area where the dummy seal pattern 1 is formed is a,
Is the line width of b, the interval between the dummy seal patterns 1 is c,
The distance between the end of the electrode substrate 2 and the outermost end of the dummy seal pattern 1 is d, the distance between the seal pattern 3 of the liquid crystal display panel and the dummy seal pattern 1 is e, and the length of the area where the dummy seal pattern 1 is formed. Is defined as f.

Next, a method of manufacturing a liquid crystal display device will be described.

A transparent conductive film made of ITO is formed on a 0.3 to 0.5 mm-thick electrode substrate 2 made of an epoxy-based or acrylic-based plastic sheet by a sputtering method, and the electrode pattern 4 is formed by etching. A dummy electrode pattern 5 is formed.

As the electrode substrate 2, a plastic film such as polyethersulfone or polyethylene terephthalate can be used. However, a plastic sheet such as an epoxy-based or acryl-based plastic sheet has a higher residual stress and may cause peeling of the seal. Because of the ease with which the present invention can be implemented, a more remarkable effect can be obtained when a plastic sheet made of epoxy or acrylic is used as the electrode substrate 2.
This is the case when used as.

The dummy electrode pattern 5 does not have to be formed. However, by bringing the electrode substrate 2 close to a uniform state, the electrode substrate 2 can be prevented from warping and bending, and peeling of the seal can be prevented. Therefore, it is desirable to form the dummy electrode pattern 5.

Next, an alignment film 6 made of polyimide or the like is formed by an offset printing method or a flexographic printing method, and an alignment process is performed by a rubbing method. The alignment film 6
It is formed on the display area of the liquid crystal display panel and also on the area where the dummy seal pattern 1 is formed.

By forming the dummy seal pattern 1 on the alignment film 6, a treatment film such as a gas barrier and a hard coat applied on the electrode substrate 2, or the dummy seal pattern 1 is formed on the dummy electrode pattern 5. Therefore, the adhesion of the dummy seal pattern 1 can be improved, and the occurrence of seal peeling can be further suppressed.

Next, a dummy seal pattern 1 and a seal pattern 3 of a liquid crystal display panel are formed on the alignment film 6 by a screen printing method using a sealing material made of an epoxy resin.

The shape of the dummy seal pattern 1 is set, for example, such that the width a of the area where the dummy seal pattern 1 is formed is 10 m.
Assuming that m, it is preferable that the dummy seal pattern 1 is formed so as to have a density of 3 to 6 in the width a of the area where the dummy seal pattern 1 is formed.

The density of the dummy seal pattern 1 is 3 lines / 1.
If it is smaller than 0 mm, the residual stress of the electrode substrate 2 cannot be completely suppressed, resulting in peeling of the seal and non-uniform cell gap.

Conversely, if the density of the dummy seal pattern 1 is 6
If the thickness is larger than / 10 mm, when the pair of electrode substrates 2 are bonded together, for example, the thickness after screen printing is 3
The dummy seal pattern 1 having a thickness of 0 μm is compressed to a thickness of 6 μm, which is a cell gap, and the line width b of the dummy seal pattern 1 is increased. May cause non-uniformity.

It is preferable to form the air vent 7 so that the dummy seal pattern 1 does not form a closed space.

Without the air vent 7, when the trapped air is heated to cure the sealing material, the pressure increases and breaks through the dummy seal pattern 1.
In this case, the peeling of the seal is likely to occur, and the cell gap may be uneven.

The line width b of the dummy seal pattern 1 is set to 0.
It is preferable to set it to 2 to 0.6 mm. Here, the line width b of the dummy seal pattern 1 is that before the pair of electrode substrates 2 are bonded.

The line width b of the dummy seal pattern 1 is 0.2
When the thickness is smaller than mm, blurring tends to occur during screen printing, and peeling of the seal tends to occur.

Conversely, when the line width b of the dummy seal pattern 1 is larger than 0.6 mm, when the pair of electrode substrates 2 are bonded, as described above, the dummy seal pattern 1
Of the dummy seal pattern 1 becomes thicker.
And the cell gap becomes non-uniform.

The distance c between the dummy seal patterns 1 is
The density of the dummy seal pattern 1 is 3 to 6 lines / 10 mm
And the line width b of the dummy seal pattern 1 is 0.2 to 0.6.
mm should be satisfied at the same time.

For example, if the line width b of the dummy seal pattern 1 is 0.2 mm, and if it is 1.76 to 4.70 mm,
The density of the dummy seal pattern 1 can be 3 to 6 lines / 10 mm.

The line width b of the dummy seal pattern 1 is 0.6
mm, the density of the dummy seal pattern 1 can be set to 3 to 6 lines / 10 mm if the distance is set to 1.26 to 4.10 mm.

The distance d between the end of the electrode substrate 2 and the outermost end of the dummy seal pattern 1 is preferably 1 to 15 mm. Here, the distance d between the end of the electrode substrate 2 and the outermost end of the dummy seal pattern 1 is before the pair of electrode substrates 2 are bonded.

When the distance d between the end of the electrode substrate 2 and the outermost end of the dummy seal pattern 1 is shorter than 1 mm, when the pair of electrode substrates 2 are bonded, The line width b becomes large, and the dummy seal pattern 1 may protrude from the electrode substrate 2.

Conversely, if the distance d between the end of the electrode substrate 2 and the outermost end of the dummy seal pattern 1 is longer than 15 mm, it becomes difficult to suppress the residual stress of the electrode substrate 2,
It causes seal peeling and non-uniform cell gap.

The distance e between the seal pattern 3 of the liquid crystal display panel and the dummy seal pattern 1 is preferably 2 to 10 mm. The distance e between the seal pattern 3 of the liquid crystal display panel and the dummy seal pattern 1 is a value before the pair of electrode substrates 2 are bonded.

If the distance e between the seal pattern 3 of the liquid crystal display panel and the dummy seal pattern 1 is shorter than 2 mm, the line width b of the dummy seal pattern 1 becomes large as described above, and the A connection failure occurs due to the presence of the dummy seal pattern 1, or a disconnection failure occurs because the seal pattern 3 of the liquid crystal display panel and the dummy seal pattern 1 are too close to each other.

Conversely, the seal pattern 3 of the liquid crystal display panel
If the distance e between the dummy seal pattern 1 and the dummy seal pattern 1 is longer than 10 mm, the cell gap may be non-uniform.

The length f of the area where the dummy seal pattern 1 is formed is determined by the seal pattern 3 of the adjacent liquid crystal display panel.
Is preferably substantially equal to the length of.

The length f of the area where the dummy seal pattern 1 is formed is the same as the seal pattern 3 of the adjacent liquid crystal display panel.
If the length is shorter than the length, the peeling of the seal and the unevenness of the cell gap are likely to occur.

Conversely, if the length f of the area where the dummy seal pattern 1 is formed is longer than the length of the seal pattern 3 of the adjacent liquid crystal display panel, the dummy seal pattern 1
Since the upper part is divided, the division is likely to be defective.

As described above, the electrode substrate 2 on which the dummy seal pattern 1 and the seal pattern 3 of the liquid crystal display panel are formed and the electrode substrate 2 on which the spacer for controlling the cell gap is arranged are bonded to each other. To obtain a liquid crystal display panel.

Then, a region other than the liquid crystal display panel on which the dummy seal pattern 1 is formed is cut off, a liquid crystal material is injected into the liquid crystal display panel, a polarizing plate is attached, and a driving circuit is connected to the liquid crystal display device. Get.

[0053]

As described above, according to the liquid crystal display device manufacturing method of the present invention, the dummy seal pattern is
By forming at a density of 3 to 6 lines per mm, peeling of the seal during the manufacturing process can be prevented, the yield rate can be improved, and a plastic liquid crystal display device having a uniform cell gap can be obtained.

Further, by forming the line width of the dummy seal pattern with a thickness of 0.2 to 0.6 mm, the peeling of the seal during the manufacturing process can be further prevented, and the yield rate can be improved. A plastic liquid crystal display device having a uniform uniformity can be obtained.

Further, the distance between the end of the electrode substrate and the outermost end of the dummy seal pattern is set to 1 to 15 mm, or the distance between the seal pattern of the liquid crystal display panel and the dummy seal pattern adjacent to the seal pattern of the liquid crystal display panel is changed. By setting the distance to 2 to 10 mm, the peeling of the seal during the manufacturing process can be further prevented, the yield rate can be improved, and a plastic liquid crystal display device having a uniform cell gap can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a seal pattern and a dummy seal pattern of a liquid crystal display panel.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dummy seal pattern 2 Electrode substrate 3 Liquid crystal display panel seal pattern 4 Electrode pattern 5 Dummy electrode pattern 6 Alignment film 7 Air release

Claims (1)

(57) [Claims] 1. A liquid crystal for obtaining a liquid crystal display panel by laminating a pair of plastic electrode substrates via a seal pattern and a dummy seal pattern of the liquid crystal display panel and separating the unnecessary regions by dividing lines. In the method for manufacturing a display device, before bonding the pair of electrode substrates, the dummy seal pattern has a thickness of 30 μm and a line width of 0.2 to 0.6 mm, and is formed in an outer region of the dividing line. to, without extending over the cutting line adjacent the 3-6 present in the 10mm wide flat
Together is formed to include a row of straight, the end of the electrode substrate and the distance between the outermost end of the dummy seal pattern as a 1 to 15 mm, the sealing of the liquid crystal display panel sealing pattern and the liquid crystal display panel of is a 2 to 10mm the distance between the dummy seal pattern adjacent to the pattern, after bonding the pair of electrode substrates, the dummy seal pattern is compressed to a thickness of 6μm liquid crystal display device according to claim Rukoto Manufacturing method.