JPH08201749A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE: To prevent the degradation in yield by the cutting of drawing out electrodes in a process for production of film LCDs. CONSTITUTION: A second contiguous body R contiguous with plural sheets of second transparent substrates is formed. Lancing grooves HC are previously formed at the boundary lines of second transparent substrates existing on at least the sides to be later formed with the drawing out electrodes by projection of first transparent substrates among the boundary lines of the second transparent substrates. After the first contiguous body R11 and the second contiguous body R12 are aligned, both contiguous bodies are stuck to each other by sealing materials S11 to form a third contiguous body. Liquid crystals are injected into the third contiguous body and the second transparent substrates are parted from the lancing grooves HC formed at the boundary lines of the second transparent substrates. The second transparent substrates are cut out of the third contiguous body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device, and more specifically, to a method of manufacturing a so-called film LCD (Liquid Crystal Display) which constitutes a liquid crystal display device using a transparent transparent substrate. Regarding improvement.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been used in various fields such as mobile phones and electronic notebooks because of their light weight. In particular, liquid crystal display devices used for such portable devices are required to be compact, lightweight, and highly durable. As a material for the transparent substrate that constitutes the liquid crystal display device, conventional glass is used. Film LC using a substrate such as a flexible film instead of the substrate
D is getting attention.

When manufacturing the film LCD, a method called a laminating method has been proposed as one method for improving mass productivity. According to this method, a large-sized flexible substrate formed by integrating a plurality of transparent transparent substrates is wound into a roll, and as shown in FIG. 11, a large-sized flexible substrate having a plurality of upper transparent substrates is formed. On the surface of the rolled upper roll (R1) and the lower roll (R2) wound with a large-sized flexible substrate having a plurality of lower transparent substrates, ITO (Indium Tin Oxid)
e) After performing various treatments such as forming a transparent electrode made of a film and an alignment film, the liquid crystal is sealed between them by bonding using a pressure bonding device (PK) and a plurality of liquid crystal display devices are integrated. It is a method of manufacturing by cutting out individual liquid crystal display devices after forming the formed products.

A film LCD formed by using this laminating method is shown in FIGS. 12 is a top view of the liquid crystal display device viewed from the second transparent substrate (2) side of the lower substrate, and FIG. 13 is a cross-sectional view taken along the line EE of FIG. As shown in FIG. 13, in this film LCD, a first transparent substrate (1) and a second transparent substrate (2) having flexibility are faced to each other and bonded by a seal material (S1), It is formed by injecting liquid crystal (LC) from the injection port (CH) formed in the pattern of S1).

The area of the first transparent substrate (1) is smaller than that of the second transparent substrate (2), and the eaves are formed so as to project from the end portion of the second transparent substrate. As shown in FIGS. 12 and 13, an extraction electrode (OE) for making contact with an external device is formed on the eaves. In order to manufacture such a liquid crystal display device by a laminating method, as shown in FIG. 14, a first roll (R1) formed by integrating a plurality of first transparent substrates (1) and shown in FIG. After aligning the second roll (R2) formed by integrating a plurality of second transparent substrates (2) with each other and pressure-bonding with the sealing material (S1), liquid crystal is injected from the inlet (CH). Inject and seal. Then, the liquid crystal display device as shown in FIGS. 12 and 13 is formed by cutting out each liquid crystal display device with a cutter or the like.

[0006]

However, according to the above-mentioned conventional method of manufacturing a liquid crystal display device, the following problems occur. That is, as shown in FIGS. 12 and 13, in order to form an eaves for drawing out the extraction electrode (OE), the second transparent substrate (2) usually has an area larger than that of the first transparent substrate (1). Is formed small.

Therefore, the second roll (R2) is shown in FIG.
As shown in FIG. 3, the dummy part (D
B) is formed, the dummy part (DB) is cut off after being aligned and bonded, and the first transparent substrate (1) is projected from the end of the second transparent substrate (2). To form the eaves. Specifically, as shown in FIG. 16, the first line from the cutting line (C1, C2, C3) using a cutter,
The second roll (R1, R2) is cut to cut out one liquid crystal display device. When cutting the dummy part (DB), especially when cutting the cutting line (C1) with a cutter. Therefore, it is necessary to cut out only the second roll (R2), so cutting out at this location requires very careful work.

However, in actuality, when cutting the second roll (R2) along the cutting line (C1) as shown in FIG. 16, it is very difficult to cut only the second roll (R2). However, as shown in FIG. 17, the cutter (CT) often reaches the surface of the first roll (R1), which causes the extraction electrode (OE) formed on the surface of the first roll (R1). ) Is cut and disconnection occurs, which causes a problem that the yield of the film LCD is significantly reduced.

[0009]

The present invention has been made in view of the above-mentioned drawbacks of the prior art. A first transparent substrate and a second transparent substrate made of an insulating thin film are arranged so as to face each other, and a liquid crystal is provided between them. The first is encapsulated and protrudes from the second transparent substrate.
A method for manufacturing a liquid crystal display device, comprising: a transparent substrate on which lead electrodes for driving the liquid crystal display device are formed.
A step of forming a first series body in which a plurality of the first transparent substrates are continuous, and a second series body in which a plurality of the second transparent substrates are continuous, and a boundary of the second transparent substrate Forming a cut groove in a boundary line of the second transparent substrate on the side on which the first transparent substrate is projected and the extraction electrode is formed at least afterwards; Aligning the first series and the second series and then bonding them with a sealing material to form a third series, and injecting liquid crystal into the third series; and The second transparent substrate is separated from the notch groove formed in the boundary line of the transparent substrate to cut out the second transparent substrate from the third series, and the first series is cut from the third series. A step of cutting out a transparent substrate to form a plurality of liquid crystal display devices. As a result, when cutting out the second transparent substrate, it is possible to manufacture the film LCD by the laminating method by suppressing the problem of cutting the lead-out electrode formed on the opposing eave-shaped first transparent substrate as much as possible. It is something that can be done.

[0010]

[Operation] According to the method for manufacturing a liquid crystal display device of the present invention, a second series of a plurality of second transparent substrates is formed, and at least one of the boundary lines of the second transparent substrates is at least after. After forming a notch in the boundary line of the second transparent substrate on the side where the transparent substrate of 1 projects and the extraction electrode is formed, after aligning the first series and the second series A third series is formed by pasting together with a sealing material, liquid crystal is injected into the third series, and this is separated from the cut groove formed in the boundary line of the second transparent substrate. The second transparent substrate is cut out from.

Therefore, of the second transparent substrate of the second transparent substrate of the second series, at least the second transparent substrate on the side where the first transparent substrate is projected afterwards and the extraction electrode is formed. Since the cut groove is formed in advance on the boundary line,
When the second transparent substrate is cut out from the third series, it can be cut by applying tension to both sides of the cut groove and separating them. Therefore, the second transparent substrate can be cut out without inserting a cutter blade at this boundary line.

As a result, when the second transparent substrate is cut out, the extraction electrode formed on the side of the first transparent substrate protruding from the second transparent substrate is erroneously cut off. It is possible to suppress the problems that have occurred conventionally as shown below. Therefore, it is possible to suppress the decrease in the yield of the liquid crystal display device due to the cutting of the extraction electrode as much as possible, and the yield is improved accordingly, and it becomes possible to easily manufacture the film LCD by the laminating method.

In the method for manufacturing a liquid crystal display device according to the present invention, a first series body is formed by integrating a plurality of first transparent boards of the first series of first transparent substrates. In the step of forming, a cut groove is also made in advance on the boundary line of the first transparent substrate. Therefore, the first and second transparent substrates are simply separated from the cut grooves formed in the first series and the second series, and the first and second transparent substrates are easily separated from each other without inserting a cutter blade.
It is possible to cut out the transparent substrate and the second transparent substrate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a liquid crystal display device according to an embodiment of the present invention will be described below with reference to the drawings. 1 is a top view of the first roll (R11),
2 is a sectional view taken along the line AA of FIG. Also, FIG.
4 is a top view of the roll (R12) of FIG.
It is a -B line sectional view. Further, FIG. 5 is a cross-sectional view illustrating the third roll, and FIG. 6 is a cross-sectional view taken along the line CC of FIG. Further, FIG. 9 shows the liquid crystal display device as a second transparent substrate (1
2) It is a top view seen from the side, and FIG. 10 is DD of FIG.
It is a line sectional view.

The liquid crystal display device according to this embodiment is a film LCD as shown in FIGS. 9 and 10, and has a flexible first transparent substrate (11) and a second transparent substrate (12). Are opposed to each other and pasted together by a seal material (S11), and liquid crystal (LC) is injected from an injection port (CH) formed in the pattern of the seal material (S11) to form a liquid crystal display device.

The area of the first transparent substrate (11) is smaller than that of the second transparent substrate (12), and the second transparent substrate (1)
It projects from the end of 2). This protruding part is shown in FIG.
As shown in FIG. 4, an extraction electrode (OE) for making contact with an external device is formed. A method of manufacturing such a film LCD will be described below. In this embodiment, the laminating method is used for manufacturing. That is, it is an example of a first series as shown in FIGS. 1 and 2, and a first roll (R11) having a plurality of first transparent substrates (11) formed thereon, and FIGS. Second as shown in 4
An example of a series of the above, wherein a plurality of second transparent substrates (12) are bonded to a second roll (R12) to form a plurality of film LCDs, and then each of the film LCDs is formed. Cut out and form.

On the first transparent substrate (11) of each of the first rolls (R11), predetermined members such as a transparent electrode made of an ITO film (not shown), a flattening film and an alignment film are laminated. A notch groove (HC) is formed in the boundary line of the first transparent substrate (11). The film thickness of the first roll (R11) is about 0.1 mm, but this notch groove (HC)
Is formed to a depth of about half the film thickness of the first roll (R11). Actually, when this is formed, a blade of a cutter with a stopper that does not penetrate beyond a predetermined depth is inserted into each boundary line.

Further, on the second transparent substrate (12) of each of the second rolls (R12), in addition to a predetermined member such as a transparent electrode made of ITO (not shown), a flattening film, an alignment film and the like, a seal is formed. The material (S11) is formed, and the area corresponding to the conventional dummy part (DB), that is, the second roll (R)
In the boundary line of 12), the second transparent substrate (12) on the side where the first transparent substrate (11) is projected and the extraction electrode (OE) is formed later, a cut groove (HC) is previously formed. Has been formed. This cut groove (HC) is also formed to the same depth by the same manufacturing method as the cut groove (HC) formed in the first roll (R11).

The first and second rolls (R1
1, R12) are aligned and then bonded with a sealant (S11), and then ultraviolet rays are irradiated to this to solidify the sealant (S11). Then, as shown in FIGS. 5 and 6, a roll (hereinafter referred to as a third roll) in which the first and second rolls (R11, R12) are integrated is formed.

After that, each inlet (CH) of the third roll
A plurality of liquid crystal display devices are formed in the third roll by injecting liquid crystal from. Then, individual liquid crystal display devices are cut out from the third roll. In this step, as shown in FIGS. 7 and 8, the jig (SU) matched with the pattern of the sealing material (S11) is used to press and fix the third roll from above the sealing material (S11). As shown in 7, tension is applied from both sides of the cut grooves (HC11, HC12).

Then, the third roll has a notch (H
C11, HC12) is torn off and cut (FIG. 8). At this time, since the blade of the cutter is not put in the boundary line to be cut and the cutting is performed, the cutting of the extraction electrode (OE) which has been caused by the blade of the cutter inadvertently entering and the scratch on this are caused. It is possible to suppress burning as much as possible.

After that, the blade of the cutter for cutting is inserted into the first to third cutting lines (CL1 to CL3) shown in FIG. 6 to cut out the individual film LCDs from the third roll. A plurality of film LCDs as shown in 10 are manufactured. As described above, according to the method of manufacturing the liquid crystal display device of the present embodiment, first, the second roll (R1
2) The second transparent substrate (1) which is on the side where the first transparent substrate (11) projects afterwards and the extraction electrode (OE) is formed
A cut groove (HC) is formed in advance in the boundary line of 2) and a part of the boundary line of the first transparent substrate (11), and tension is applied from both sides of the cut (HC) to tear off the groove. From the roll of 3 the first transparent substrate (11) and the second
A plurality of liquid crystal display devices are formed by cutting out the transparent substrate (12) and the transparent substrate (12), respectively.

Therefore, the first transparent substrate (11) projects after the second roll (R12) and the extraction electrode (O).
In the boundary line of the second transparent substrate (12) on the side where E) is formed, a cut groove (HC) is previously formed,
Since the second transparent substrate (12) can be cut only by pulling it away from the cut groove (HC), the third transparent substrate (12) can be cut.
When the second transparent substrate (12) is cut out from the roll, the second transparent substrate (12) can be cut out without inserting a cutter blade at this boundary line.

As a result, when the second transparent substrate (12) is cut out, it is formed on the side of the first transparent substrate (11) which later projects from the second transparent substrate (12) as shown in FIG. In addition, it is possible to avoid a situation that has occurred conventionally, such as accidentally disconnecting the extraction electrode (OE). Therefore, it is possible to suppress the decrease in the yield of the liquid crystal display device due to the cutting of the extraction electrode as much as possible, and the yield is improved accordingly, and it becomes possible to easily manufacture the film LCD by the laminating method.

The notch groove (HC) is formed in the second roll (R12) by forming the third roll by laminating the second roll (R12) with the first roll (R11). If it is before, it may be formed at any time, and the place where the cut groove (HC) is formed is limited to a part of the boundary line in the present embodiment, but the first and second transparent substrates (11, 1
Even if the cut grooves (HC) are formed on all the boundary lines of 2), the same effect is obtained. In this case, it is possible to cut without using a cutter at all, and there is also an advantage that cutting out becomes easy.

Further, in this embodiment, the first transparent substrate (1
Although the liquid crystal display device in which the area 1) is smaller than the area of the second transparent substrate 12 is described, the present invention is not limited to this, and one of the upper and lower transparent substrates may be used. Any liquid crystal display device in which an eaves portion is formed so as to project from the opposing transparent substrate and the extraction electrode is formed on the eaves portion has the same effect, and, for example, upper and lower transparent substrates. Even if the sizes are the same, they are arranged so as to be offset from each other, and one of the upper and lower transparent substrates projects from the opposing transparent substrate to form an eaves portion, and the extraction electrode is formed on it. The same effect can be obtained even with such a liquid crystal display device.

[0027]

As described above, according to the method of manufacturing the liquid crystal display device of the present invention, the second series is formed, and the first series is formed at least after the boundary line of the second transparent substrate. The second side on the side where the transparent substrate projects and the extraction electrode is formed
A pre-grooved groove is formed at the boundary of the transparent substrate of
After aligning the second series with the second series, the third series is formed by adhering the second series with a sealing material, and the liquid crystal is injected into the third series, and the first and the second cut grooves are formed. A plurality of liquid crystal display devices are formed by separating the second transparent substrate from the groove of the boundary line of the second transparent substrate and cutting the second transparent substrate from the third series.

Therefore, among the boundary lines of the second transparent substrate of the second series, the boundary lines of the second transparent substrate on the side where the lead electrode is formed after the first transparent substrate protrudes. Since the notch groove is formed in advance, when the second transparent substrate is cut out from the third series, it is possible to apply tension to both sides of the notch groove to separate them. Therefore, the second transparent substrate can be cut without inserting a cutter blade on this boundary line, and the cutter blade is then attached to the extraction electrode formed on the side of the first transparent substrate protruding from the second transparent substrate. It is possible to prevent the problem that has occurred in the past, such as cutting this by inserting it by mistake.

Therefore, it is possible to suppress the decrease in the yield of the liquid crystal display device due to the cutting of the extraction electrode as much as possible, and the yield is improved accordingly, and the film LC by the laminating method is used.
It becomes possible to facilitate the production of D.

[Brief description of drawings]

FIG. 1 is a top view illustrating a first roll according to an exemplary embodiment of the present invention.

FIG. 2 is a sectional view illustrating a first roll according to an exemplary embodiment of the present invention.

FIG. 3 is a top view illustrating a second roll according to the exemplary embodiment of the present invention.

FIG. 4 is a sectional view illustrating a second roll according to the exemplary embodiment of the present invention.

FIG. 5 is a sectional view illustrating a third roll according to the embodiment of the present invention.

FIG. 6 is a top view illustrating a third roll according to the exemplary embodiment of the present invention.

FIG. 7 is a first cross-sectional view illustrating a cutting step according to the embodiment of the present invention.

FIG. 8 is a second cross-sectional view illustrating a cutting step according to the embodiment of the present invention.

FIG. 9 is a top view illustrating a liquid crystal display device according to an example of the present invention.

FIG. 10 is a cross-sectional view illustrating a liquid crystal display device according to an example of the present invention.

FIG. 11 is a diagram illustrating a method of manufacturing a film LCD by a laminating method.

FIG. 12 is a top view illustrating a liquid crystal display device according to a conventional example.

FIG. 13 is a cross-sectional view illustrating a liquid crystal display device according to a conventional example.

FIG. 14 is a top view illustrating a first roll according to a conventional example.

FIG. 15 is a top view illustrating a second roll according to a conventional example.

FIG. 16 is a sectional view illustrating a method of cutting out a film LCD according to a conventional example.

FIG. 17 is a diagram illustrating a problem of the conventional example.

[Explanation of symbols]

 (11) First transparent substrate (12) Second transparent substrate (R11) First roll (R12) Second roll (CH) Injection port (HC) Notch groove (S11) Seal material (OE) Lead electrode (LC) Liquid crystal layer (CL1 to CL3) cutting line

Claims (2)

[Claims] 1. A first transparent substrate made of an insulating thin film and a second transparent substrate are arranged to face each other, liquid crystal is sealed between them, and the first transparent substrate is projected from the second transparent substrate. And a method for manufacturing a liquid crystal display device in which extraction electrodes for driving the liquid crystal display device are formed, the method comprising: forming a first series body in which a plurality of the first transparent substrates are connected; A second series of continuous sheets of the second transparent substrate is formed, and the first transparent substrate protrudes at least after the boundary line of the second transparent substrate to form the extraction electrode. Forming a cut groove in the boundary line of the second transparent substrate on the side, and aligning the first series and the second series with each other and then bonding them with a sealing material. Form a third series and inject liquid crystal into the third series. And a step of separating the second transparent substrate from the notch formed in the boundary line of the second transparent substrate to cut out the second transparent substrate from the third series body, and And a step of forming a plurality of liquid crystal display devices by cutting out the first transparent substrate from the series. 2. In the step of forming the first series, a cut groove is formed in advance on a boundary line of the first transparent substrate, and the first transparent substrate is formed from the third series. In the step of cutting out, the first transparent substrate is separated from the notch formed in the boundary line of the first transparent substrate, and the first transparent substrate is cut out from the third series. The method for manufacturing a liquid crystal display device according to claim 1.