JP2000305060A - Manufacture of liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of obtaining a thin and lightweight liquid crystal display device even when conventional manufacturing facilities are used without remodeling. SOLUTION: The external surface of a liquid crystal display panel filled with liquid crystal is polishing to make the thickness of the substrate of the liquid crystal panel smaller after the polishing than before the polishing. In another embodiment where a the liquid crystal display device having liquid crystal injected by a vacuum method is manufactured, a cell is formed by bonding a couple of substrates together with a seal material and the external surface of the cell is polished after the seal material is cured and before liquid crystal is injected into the cell to make the thickness of the substrate of the cell smaller after polishing than before polishing. In still another embodiment where a liquid crystal display device having liquid crystal injected by a dripping method is manufactured, the outer peripheral part of at least one substrate is coated with a seal material, liquid crystal is dripped inside the seal material, and the other substrate is bonded to form a liquid crystal cell; and the external surface of the liquid crystal cell is polished after the seal material is cured to make the thickness of the substrates of the liquid crystal cell smaller after the polishing than before the polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a liquid crystal display device.

[0002]

2. Description of the Related Art FIG. 7 shows a configuration of a liquid crystal display device. The liquid crystal display panel 1 is formed by filling a liquid crystal 2 in a cell in which a first glass substrate 4a and a second glass substrate 4b are bonded with a sealant 3. The first and second glass substrates 4a and 4b usually have a thickness of 1.1 m.
The first and second glass substrates 4a and 4b are provided with a color filter, a transistor array, a transparent electrode, and the like, so that a passive mode, a TN mode TFT, Devices such as IPS mode can be created.

[0003] As a method for filling a cell with liquid crystal, a vacuum injection method, a dropping method and the like are known. FIG. 8 shows a process of manufacturing a liquid crystal display device by a vacuum injection method. Step S1
Then, the first and second glass substrates 4a and 4b are washed, and in step S2, a liquid alignment material is applied to the washed first and second glass substrates 4a and 4b by offset printing or the like, and then temporarily. After firing and main firing, an alignment film is formed.

In step S3, the alignment film is subjected to an alignment treatment by rubbing or the like, and in step S4, water cleaning is performed to remove foreign substances and dirt on the substrate surface after rubbing. In step S5a, one of the glass substrates,
For example, a seal material 3 for sealing the liquid crystal 2 is applied to the first glass substrate 4a by a drawing device, screen printing, or the like, to form a seal pattern. Further, UV resin for temporary fixing is spot-coated with a dispenser or the like outside the display area of the liquid crystal display panel 1.

At the same time, in step S5b, a spacer of a predetermined size is sprayed to form a gap in the other second glass substrate 4b. In step S6, the first glass substrate 4a on which the seal is printed and the second glass substrate 4b on which spacers are scattered are bonded in the air, and both substrates are pressed to make the gap between the substrates constant. The sealing material 3 is cured by ultraviolet light or heat.

In step S8, a glass portion outside the display area of the substrate is cut to leave a necessary terminal portion to form a cell. In step S9, the cell is placed in a vacuum chamber and the inside of the chamber is reduced to 0.1. After reducing the pressure to about 0.7 Torr, the injection port of the empty cell is immersed in the liquid crystal 2. Next, the inside of the vacuum chamber is opened to the atmosphere, and the liquid crystal 2 is filled in the empty cell by the differential pressure and the capillary action.

In step S10, when the required amount of the liquid crystal 3 is filled, the inlet is sealed with a resin, and the extra liquid crystal 3 is washed. In step S11, the obtained liquid crystal display panel 1 is subjected to an annealing process, and the liquid crystal 3 is subjected to a realignment process. On the other hand, the manufacturing process of the liquid crystal display panel by the vacuum injection method is performed according to the procedure shown in FIG.

Steps S1 to S4 are the same as those in FIG. 8 showing the above-described vacuum injection method. In step S5a, the sealing material 3 is applied to the outer peripheral portion of the first glass substrate 4a by drawing or printing, and a required amount of liquid crystal is dropped inside the sealing material 3 in step S6a. The amount of the liquid crystal 2 to be dropped can be calculated in advance from the display area of the liquid crystal display panel 1 and the gap thickness. A pattern is prepared so that the liquid crystal 2 spreads uniformly, and the defoamed liquid crystal 2 is dropped.

Note that a radical or cationic UV resin is used for the sealing material 3. In addition, the conductive resin is applied by a dispenser in a spot manner. Steps S5a and S6
In step S5b, spacers are scattered on the second glass substrate 4b in parallel with step a. In step S6b, the spacers are fixed or projections are formed in advance.

In step S7, the first liquid crystal 2 is dropped.
The glass substrate 4a and the second glass substrate 4b are bonded together in a vacuum chamber via a spacer, and in step S8, the display unit is hidden with a mask to prevent the liquid crystal 2 from deteriorating due to ultraviolet rays, and only the sealing material 3 is used. Ultraviolet irradiation is performed to cure the sealing material 3. In step S9, the liquid crystal 2 is realigned by an annealing process. In step S10, the liquid crystal display is cut by cutting the outside of the display area of the first and second glass substrates 4a and 4b while leaving necessary terminal portions. Panel 1 is obtained.

As described above, the liquid crystal display device manufactured by the vacuum injection method or the dropping method is used for OA equipment such as a personal computer, a word processor, and a monitor, and portable information communication equipment. As described above, the thickness of the glass substrate used in such a liquid crystal display device is 1.1 mm or 0.7 mm in a normal mass production level.
mm is the mainstream, and a mass production method for panel production according to the plate thickness has been established.

[0012]

However, in recent years, there has been a demand for a liquid crystal display device to be lighter and thinner. Therefore, a liquid crystal display device has been manufactured using a glass substrate thinner than the above glass substrate. Have been. The thickness of the glass substrate is required to be smaller than 0.7 mm, preferably 0.5 mm or less. A liquid crystal display device will be manufactured using such a glass substrate. Then, in the cleaning process of step S4, the glass substrate floats and breaks, and when the substrate size of the glass substrate is set to a large size of 550 × 650 mm, it is difficult to carry the rollers or change the direction of the substrate. As a result, the substrate is liable to be cracked, so that the equipment needs to be significantly remodeled. As described above, when a glass substrate having a smaller thickness than the conventional one is used, there is a problem that the substrate is frequently broken in a conventionally used manufacturing apparatus, and the manufacturing stability cannot be obtained.

In particular, when a trouble such as breaking of glass occurs in an in-line state, the effect on cost is increased due to deterioration in yield and workability in panel manufacturing. It is also difficult to make it thinner. Further, in the case of a glass substrate having a small thickness as described above, the thickness of the glass substrate varies when the alignment film is printed, the uniformity of the gap cannot be obtained, and the effect on the performance is inevitable.

An object of the present invention is to solve the above-mentioned problems and to provide a method of manufacturing a liquid crystal display device which can obtain a thin and lightweight liquid crystal display device without using conventional manufacturing equipment without modification. And

[0015]

The method of manufacturing a liquid crystal display device according to the present invention is characterized in that the thickness of the glass substrate is reduced after the formation of the liquid crystal display panel or during the manufacturing process of the liquid crystal display panel. . According to the present invention, a lightweight and thin liquid crystal display device can be manufactured without modifying a conventional manufacturing facility.

[0016]

According to a first aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, the method comprising: polishing an outer surface of a liquid crystal display panel filled with liquid crystal; It is characterized in that the thickness of the substrate is reduced. In the method of manufacturing a liquid crystal display device according to claim 2, when manufacturing a liquid crystal display panel into which liquid crystal is injected by a vacuum method, a pair of substrates is bonded with a sealing material to form a cell, and the sealing material is cured. After the polishing and before injecting the liquid crystal into the cell, the outer surface of the cell is polished so that the thickness of the substrate of the cell after polishing is smaller than that of the cell before polishing.

According to a third aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the second aspect, wherein the outer periphery of the first sealant to which the substrate is bonded is further surrounded by the second sealant and then polished. Dust prevention in the process is performed, and thereafter, the substrate is cut and removed between the first sealing material and the second sealing material along each side to open the liquid crystal suction port and inject the liquid crystal into the cell. It is characterized by the following.

According to a fourth aspect of the present invention, in manufacturing a liquid crystal display panel into which liquid crystal is injected by a dropping method, a sealing material is applied to an outer peripheral portion of at least one of the substrates. A liquid crystal is dropped on the inside, a liquid crystal cell is formed by bonding the liquid crystal cell to the other substrate, and after curing the sealing material, the outer surface of the liquid crystal cell is polished, and the liquid crystal cell after polishing is polished more than the liquid crystal cell before polishing. The thickness of the substrate of the liquid crystal cell is reduced.

According to a fifth aspect of the present invention, in the method of manufacturing a liquid crystal display device according to the fourth aspect, the outer peripheral portion of the first sealant to which the substrate is bonded is further surrounded by the second sealant and then polished. Dust protection is performed in the process, and thereafter, the substrate is cut and removed between the first seal material and the second seal material along each side. Hereinafter, embodiments of the present invention will be described with reference to FIGS.

The same components as those shown in FIGS. 7 to 9 showing the above-described conventional example are denoted by the same reference numerals. (Embodiment 1) In this (Embodiment 1), in order to reduce the weight and thickness of a liquid crystal display panel manufactured by a vacuum injection method or a dropping method as in the above-described conventional example, a finished liquid crystal display panel is manufactured. Is polished to reduce the thickness of the substrate.

FIG. 1 shows an apparatus for polishing a glass substrate. In the polishing apparatus, the polishing surface of the first surface plate 5 having the rotation axis 9a disposed at the center and the polishing surface of the second surface plate 6 having the rotation shaft 9b disposed at the center are formed by a liquid crystal to be polished. They are arranged so as to face each other via a carrier 7 for fixing the display panel 1a. Polishing of the outer surface of the liquid crystal display panel by this polishing apparatus is performed in the following procedure.

First, the first part of the liquid crystal display panel 1a will be described.
The liquid crystal display panel 1a is sandwiched between the polishing devices so that the outer surface of the glass substrate 4a contacts the first surface plate 5 and the outer surface of the second glass substrate 4b contacts the second surface plate 6, and the carrier At 7, the liquid crystal display panel 1a is fixed so as not to move. Then, a polishing liquid containing an abrasive having a predetermined particle size is poured into the polishing apparatus, and the polishing liquid divided into the upper and lower layers of the carrier 7 is transferred to the contact surface between the first glass substrate 4a and the upper platen 5, the second Into the contact surface between the glass substrate 4b and the lower platen 6.

In this state, the first surface plate 5 and the second surface plate 6 are rotated in directions opposite to each other, and both outer surfaces of the liquid crystal display panel 1a are simultaneously polished by the centrifugal force. The degree of polishing of the liquid crystal display panel 1a can be appropriately adjusted by selecting the particle size of the abrasive. The process conditions in the polishing process include, in general, a method of grinding down the thickness of the glass by 0.2 mm or more, in which coarse polishing is performed in the first stage, final polishing is performed in the second stage, or two or more times of the main polishing. There are cases in which the process is performed separately. In such polishing, it is necessary to obtain sufficient surface properties in the final polishing.

The amount to be polished is not particularly limited. However, from the viewpoint of cost, it is preferable that the polished liquid crystal display panel 1a be polished so that the thickness of the liquid crystal display panel 1a becomes smaller than 1.0 mm. By polishing the outer surface of the liquid crystal display panel filled with liquid crystal as described above, and making the substrate of the liquid crystal display panel after polishing thinner than the liquid crystal display panel before polishing, the conventional manufacturing apparatus for a liquid crystal display device is manufactured. Even if the liquid crystal display device is used without modification, the liquid crystal display device can be manufactured without breakage of the glass substrate and with good stability. As a result, a light and thin liquid crystal display device, specifically, a glass substrate having a thickness of 0.7 m
0.6 mm or less, more preferably 0.5 m
Thus, a liquid crystal display device having a thickness of not more than m can be obtained.

In the above (Embodiment 1),
Although both outer surfaces of the liquid crystal display panel 1a are polished simultaneously, the present invention is not limited to this, and the outer surface of the liquid crystal display panel 1a may be polished one by one. When polishing the outer surface of the liquid crystal display panel 1a one surface at a time, the rotation of one surface plate is stopped, and only the surface plate in contact with the outer surface of the liquid crystal display panel 1a to be polished is rotated. realizable.

The liquid crystal display panel 1a to be polished may be manufactured by any of a vacuum injection method and a dropping method. Particularly, if the liquid crystal display panel is already filled with a certain amount of liquid crystal. It is not limited. (Embodiment 2) In the above (Embodiment 1), the outer surface of the liquid crystal display panel 1a filled with the liquid crystal is polished, but in this (Embodiment 2), the liquid crystal display panel by the vacuum injection method is used. Is different from the above (Embodiment 1) in that the glass substrate is polished in the middle of the manufacturing process.

FIG. 2 is a flow chart showing the steps of manufacturing a liquid crystal display panel by the vacuum injection method in (Embodiment 2). Steps S1 to S7 are the same as those in FIG. 8 showing the conventional example, but after the seal hardening in step S7 and before the cutting step of the liquid crystal display panel in step S8, step S7a which is a feature of this flowchart is performed.
In that a cell polishing step is inserted.

In this step S7a, first, the liquid crystal display panel 1
An empty cell before filling the liquid crystal is set instead of a. Then, the outer surface of the cell is polished under the same polishing process conditions as in the first embodiment. Steps S8 to S11 performed after the above-described polishing step are the same as those in FIG. 8 showing the conventional example.

According to such a method of manufacturing a liquid crystal display device, the first glass substrate 4a and the second glass substrate 4b are bonded to each other with the sealing material 3 and the empty cell after the sealing material 3 is cured. Because the outer surface is polished to reduce the thickness of the cell substrate after polishing compared to the cell before polishing,
When printing an alignment film, a substrate having a large thickness can be used, a variation in film thickness can be eliminated, and a film having good gap uniformity can be obtained.

Since a glass substrate having the same thickness as that of the conventional glass substrate is used until the empty cell is formed, the glass substrate is not damaged even in an in-line state such as a cleaning step after rubbing in step S4. A liquid crystal display device with good yield and good workability can be obtained. Further, the manufacturing apparatus of the liquid crystal display device by the conventional vacuum method can be used without modification, and a large-sized substrate of 550 × 650 mm is used as the first and second substrates 4a and 4b forming the empty cells. Even if it is used, it is possible to easily carry the rollers or change the direction of the substrate without causing the glass substrate to crack or chip.

As a result, a lightweight and thin liquid crystal display device can be manufactured with good manufacturing stability. In the above (Embodiment 2), both outer surfaces of the empty cells are polished at the same time. However, the present invention is not limited to this, and polishing may be performed on each of the surfaces. Good. Further, the polishing process may be performed only on one surface, not both surfaces of the empty cell.

(Embodiment 3) This (Embodiment 3)
Is different from the first embodiment in that a second sealant is provided in addition to the first sealant to be attached to the substrate when manufacturing an empty cell for the purpose of protecting the liquid crystal and the terminal portion of the liquid crystal display device. The other basic configuration is almost the same as the above (Embodiment 2).

FIG. 3 is a plan view of the first substrate 4a before bonding in step S6 in (Embodiment 3). In the step of printing the sealing material in step S5a, the first sealing material 3a for bonding the substrate to the outer periphery of the first glass substrate 4a is provided with an opening 8 for injecting liquid crystal.
a and 8b are applied. Then, a second sealing material 3b is applied so as to further surround the outer peripheral portion of the first sealing material 3a.

A terminal electrode 9 is provided between the first sealing material 3a and the second sealing material 3b. The first and second sealing materials 3
An empty cell is formed using the first glass substrate 4a provided with the first and second sealing materials 3a and 3b, and the polishing process of step S7a is performed by curing the first and second sealing materials 3a and 3b.

As described above, the second sealing material 3b is applied to the empty cell outside the terminal electrode 9 and the outer periphery of the cell is sealed. It is possible to prevent the cells from entering the inside of the cell through the portions 8a and 8b. In addition, the second sealing material 3b comes into contact with the terminal electrode 9 disposed at the end of the liquid crystal display panel 1a when a polishing liquid or a coating particle enters between the first and second glass substrates 4a and 4b. Therefore, contamination and corrosion of the terminal electrode 9 can be prevented.

In the cutting step of step S8, the substrate is cut along the cutting line ab of the bonded cells, and the portion to which the second sealing material 3b has been applied is removed to remove the openings 8a, 8b.
Release 8b to atmosphere. Similarly, the substrate is cut along the cutting lines cd, ef, and gh on each side, and the portion to which the second sealant 3b is applied is cut and removed. Then, in step S9, the liquid crystal 3 is injected through the openings 8a and 8b.

The subsequent steps are the same as the above (Embodiment 2). As described above, in addition to the first sealing material 3a for bonding the first and second substrates 4a and 4b, the outer peripheral portion of the empty cell is sealed to prevent the intrusion of the polishing liquid or the coating powder in the polishing process. By providing the second sealing material 3b for preventing
And a liquid crystal display device free of contamination and corrosion of the terminal electrode 9.

Although the terminal electrode 9 may be cut in the cutting step of step S8, the terminal electrode 9 is always disposed inside the second sealing material. (Embodiment 4) In the above (Embodiment 2) and (Embodiment 3), the manufacturing method of the liquid crystal display device by the vacuum injection method has been described. In Embodiment 5), a method for manufacturing a liquid crystal display device by a dropping method will be described.

FIGS. 4 and 5 show (Embodiment 4) of the present invention.
Is shown. FIG. 4 is a flowchart showing the steps of manufacturing a liquid crystal display panel by the dropping method in (Embodiment 4). Steps S1 to S8 are the same as FIG. 9 showing the conventional example, but after the sealing material is cured in step S8, the step of polishing the liquid crystal display panel of step S8a, which is a feature of this flowchart, is inserted in this flowchart. Different in that.

In step S8a, first, the polishing apparatus used in the first embodiment is used to set the liquid crystal display panel 1
Instead of a, a cell filled with liquid crystal formed by the dropping method shown in the above conventional example is set. Then, the outer surface of the cell is polished under the same polishing process conditions as in the first embodiment. Steps S9 and S10 performed after the above-described polishing step are performed as shown in FIG.
Is the same as

According to such a method of manufacturing a liquid crystal display device, the outer surface of the liquid crystal cell formed by the dropping method is polished so that the substrate of the liquid crystal cell after polishing is made thinner than the liquid crystal cell before polishing. Therefore, when printing an alignment film, a substrate having a large plate thickness can be used, and variations in film thickness can be eliminated, and a film having good gap uniformity can be obtained. The liquid crystal cell is
Since a glass substrate having the same thickness as that of the related art can be used, breakage of the glass substrate in an in-line state such as a cleaning process after rubbing in step S4 is eliminated, and a liquid crystal display panel with good yield and good workability can be obtained. .

Further, a conventional apparatus for manufacturing a liquid crystal display panel by a dropping method can be used without modification, and 550 is used as the first and second substrates 4a and 4b for forming liquid crystal cells.
Even if a substrate having a large size of 650 mm is used, it is possible to easily carry the rollers and change the direction of the substrate.
As a result, similarly to the above (Embodiment 1) to (Embodiment 3), a lightweight and thin liquid crystal display panel can be manufactured with high stability.

In the above (Embodiment 4), both outer surfaces of the liquid crystal cell are polished at the same time. However, the present invention is not limited to this. May be applied. Further, not only both surfaces of the liquid crystal cell but also only one surface may be polished to reduce the thickness of the substrate. (Embodiment 5) FIGS. 5 and 6 show (Embodiment 5) of the present invention.

In this (Embodiment 5), in order to protect the terminal electrodes 9 of the liquid crystal display panel, when manufacturing a liquid crystal cell, the outer peripheral portion of the first sealing material 3a to be bonded to the substrate is further covered with the second sealing material. However, the basic configuration other than the above is substantially the same as the above (Embodiment 4). FIG. 5 shows a plan view of first substrate 4a before bonding in (Embodiment 5).

In the step of printing the sealing material in step S5a, the first sealing material 3a is applied to the outer peripheral portion of the first glass substrate 4a. Next, a second sealing material 3b is applied to the outer peripheral portion of the first glass substrate 4a so as to cover the outside of the first sealing material 3a. The first and second sealing materials 3
A liquid crystal cell is formed using the first glass substrate 4a to which the liquid crystal cells 3c and 3d are applied, and the first and second sealing materials 3c and 3d of the liquid crystal cell are cured, and the first and second sealing materials 3c and 3d are cured in the polishing step of step S8a. The outer surfaces of the second substrates 4a and 4b are polished.

By providing such a second sealing material 3d to seal the liquid crystal cell, it is possible to prevent the polishing liquid or the coating particles from entering the liquid crystal cell in the polishing step as in the above (Embodiment 3). Thus, contamination and corrosion of the terminal electrode 9 can be prevented. Then, as in the above (Embodiment 4), step S
9, an annealing process is performed, and in the cutting process of step S10, the necessary second terminal portions 9 are left along the cutting lines ab, cd, ef, and gh to form the second seal. Lumber 3
By cutting and removing the substrate coated with b, the liquid crystal display panel 1a is obtained.

FIG. 6 shows details of the cutting step in step S10. As shown in FIG. 6A, the first sealing material 3a
In order to cut the first glass substrate 4a and the second glass substrate 4b bonded together with the second sealing material 3b and form the liquid crystal display panel 1a having the shape shown in FIG. First, as shown in FIG. 6 (b), a scratch (microcrack) 10a is made in glass at a predetermined position on the first glass substrate 4b with a diamond (circular) cutter or the like.
When the hard rubber is hit on the line of the scratch 10a, the first glass substrate 4a is completely broken.

At this time, the second sealing material 3b also has an effect of preventing the remaining portion of the broken second glass substrate 4b from scattering. Next, as shown in FIG. 6C, the first glass substrate 4a is similarly broken by applying a force to the first glass substrate 4a by making a scratch 10b. As shown in FIG. 6D, the selected liquid crystal display panel has a shape similar to that of FIG.

According to the fifth embodiment, substantially the same effects as those of the third embodiment can be obtained.

[0050]

As described above, according to the manufacturing method of the liquid crystal display device of the present invention, the outer surface of the liquid crystal display panel filled with liquid crystal is polished, and the polished liquid crystal display panel is more polished than the unpolished liquid crystal display panel. By reducing the thickness of the substrate, it is possible to use a substrate with the same thickness as the conventional one until the liquid crystal display panel is obtained. No liquid crystal display is obtained. In addition, by polishing the outer surface of the finished liquid crystal display panel, the thickness can be reduced, and the weight and thickness of the liquid crystal display panel can be reduced, so that a liquid crystal display panel suitable for a portable terminal can be obtained. Further, stable production of liquid crystal display panels with a good yield can be realized.

When manufacturing a liquid crystal display panel into which liquid crystal is injected by a vacuum method, a pair of substrates is bonded together with a sealing material to form a cell, and after the sealing material is cured, the liquid crystal is applied to the cell. The same effect as described above can also be obtained by polishing the outer surface of the cell before implantation and making the substrate of the cell after polishing thinner than the cell before polishing.

Further, after the outer peripheral portion of the first sealant to which the substrates are bonded is further surrounded by the second sealant, polishing is performed to prevent dust in the polishing step, and then the first sealant along each side is formed. By cutting and removing the substrate between the sealing material and the second sealing material, opening the liquid crystal suction port and injecting the liquid crystal into the cell, contamination inside the cell is prevented, and the terminal electrode of the liquid crystal display panel is removed. Corrosion due to damage or contamination can be prevented.

When manufacturing a liquid crystal display panel into which liquid crystal is injected by a dropping method, a sealing material is applied to an outer peripheral portion of at least one substrate, and liquid crystal is dropped inside the sealing material, and the other substrate is dropped. By forming a liquid crystal cell by laminating and sealing the sealing material, by polishing the outer surface of the liquid crystal cell, by reducing the thickness of the substrate of the liquid crystal cell after polishing than the liquid crystal cell before polishing. Also, the same effect as described above can be obtained.

Further, after the outer peripheral portion of the first sealant to which the substrates are bonded is further surrounded by the second sealant, polishing is performed to prevent dust in the polishing step, and then the first sealant along each side is formed. By cutting and removing the substrate between the sealant and the second sealant, breakage and corrosion of terminal electrodes on the outer peripheral portion of the liquid crystal display panel can be prevented.

[Brief description of the drawings]

FIG. 1 shows a polishing apparatus for a liquid crystal display panel according to (Embodiment 1).

FIG. 2 is a flowchart showing a manufacturing process of a liquid crystal display device in Embodiment 2;

FIG. 3 is a plan view of a first glass substrate in Embodiment 3;

FIG. 4 is a flowchart showing a manufacturing process of a liquid crystal display device in Embodiment 4;

FIG. 5 is a plan view of a first glass substrate in Embodiment 5;

FIG. 6 is a view showing a step of cutting a substrate in Embodiment 5;

FIG. 7 is a sectional view of a conventional liquid crystal display device.

FIG. 8 is a flowchart showing a manufacturing process of a liquid crystal display device in a conventional vacuum method.

FIG. 9 is a flowchart showing a manufacturing process of a liquid crystal display device in a conventional dropping method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 3a, 3b 1st, 2nd sealing material 4a, 4b 1st, 2nd glass substrate 5 Upper surface plate 6 Lower surface plate

Claims (5)

[Claims] 1. A method of manufacturing a liquid crystal display device, wherein the outer surface of a liquid crystal display panel filled with liquid crystal is polished to reduce the thickness of the substrate of the liquid crystal display panel after polishing compared to the liquid crystal display panel before polishing. 2. When manufacturing a liquid crystal display device into which liquid crystal is injected by a vacuum method, a pair of substrates is bonded with a sealing material to form a cell, and after the sealing material is cured, the liquid crystal is applied to the cell. Polishing the outer surface of the cell before injecting,
A method for manufacturing a liquid crystal display device, wherein a substrate of a cell after polishing is made thinner than a cell before polishing. 3. A first sealing material to which a substrate is bonded is further surrounded by a second sealing material, and then polished to prevent dust in the polishing process. 3. The method for manufacturing a liquid crystal display device according to claim 2, wherein the substrate is cut and removed between the sealing material and the second sealing material, the liquid crystal suction port is opened, and the liquid crystal is injected into the cell. 4. When manufacturing a liquid crystal display device into which liquid crystal is injected by a dropping method, a sealing material is applied to an outer peripheral portion of at least one of the substrates, and liquid crystal is dropped inside the sealing material. After the liquid crystal cell is formed by laminating the sealing material, the outer surface of the liquid crystal cell is polished, and the substrate of the liquid crystal cell after polishing is thinner than the liquid crystal cell before polishing. Device manufacturing method. 5. A first sealing material to which a substrate is bonded is further surrounded by a second sealing material, and then polished to prevent dust in the polishing step. Thereafter, the first sealing material along each side is formed. 5. The method according to claim 4, wherein the substrate is cut and removed between the sealing material and the second sealing material.