JPH08271912A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE: To improve production efficiency by specifying the defective region under production process. CONSTITUTION: This process for production of a liquid crystal display device comprises the process of sticking a first glass substrate 24 which is formed with first display patterns of a prescribed shape with transparent conductive materials within individual block regions blocked in row and column directions, is segmented with the first display patterns into individual patterns and is printed and formed with frame-shaped sealing materials 20 having liquid crystal injection ports and a second glass substrate 25 formed with second display patterns opposite the first display patterns, then dividing the substrates into individual display cells. The sealing materials 20 are formed so as to be vertically or horizontally asymmetrical. Identification symbols to identify the position of the block regions used for the display cells are formed simultaneously with the display patterns prior to the division.

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 in particular, to promptly check for defects during the manufacturing process.
The present invention relates to a method for manufacturing a liquid crystal display device suitable for improvement.

[0002]

2. Description of the Related Art A conventional liquid crystal display device will be described.
7 and 8 are a top view and a cross-sectional view showing a conventional general liquid crystal display device. In the figure, 1 is a glass substrate on the surface side on which a transparent electrode 2 for applying a voltage to the liquid crystal and an alignment film 3 are formed, and 4 is a transparent electrode 5 and an alignment film 6 for applying a voltage to the liquid crystal. In the glass substrate on the back surface side where the is formed, the glass substrate 1 on the front surface side and the glass substrate 4 on the back surface side are bonded together via a sealing material 7 containing a large number of glass spheres.

The sealing material 7 has a spacer function for securing a cell chamber 10 for accommodating liquid crystal between the glass substrate 1 and the glass substrate 4, and is provided with only one liquid crystal inlet. Here, 9 is a liquid crystal filled in the cell chamber 10. Next, a conventional method of manufacturing a liquid crystal display device will be described with reference to FIGS. 9 to 12
In the figure, the drawing on the left is a top view and the drawing on the right is a cross-sectional view. For convenience of explanation, the transparent electrodes 2, 5 and the alignment film 3,
6 is not shown.

First, as shown in FIG. 9, transparent electrodes are arranged so that the front surface glass substrate 1 and the rear surface glass substrate 4 are alternately arranged in order to ensure manufacturability and effective utilization. It is formed on the first glass substrate 11, and an alignment film is formed on the first glass substrate 11. A frame-shaped sealing material is formed in the same shape by screen printing in the peripheral portions of the plate surfaces of the respective regions 1A and 4A to be the glass substrates 1 and 4 on the front surface side and the rear surface side, except for the liquid crystal injection port 8.

On the other hand, as shown in FIG. 10, in the second glass substrate 12, the glass substrate 1 on the front surface side and the glass substrate 4 on the back surface side of the first glass substrate 11 are arranged in the same order. Like, for example, F (front), B (back)
And transparent electrodes are formed in an alternating order, and an alignment film is formed on the transparent electrodes. After that, the sealing material 7 for connecting the transparent material and the sealing material 7 of the first glass substrate 11 to the regions 1A and 4A to be the glass substrates 1 and 4 on the front surface side (F side) and the back surface side (B side), respectively. The Ag paste 13 is screen-printed in a dot shape, for example, at a position near the vicinity of and in a state independent of the sealing material 7.

Next, as shown in FIG. 11, the front glass substrate 1 and the rear glass substrate 4 face each other, and
The first and second glass substrates 11 and 12 are attached so that the Ag paste 13 and the sealing material 7 overlap each other.
Next, heat treatment is performed, and the glass substrates 1 and 4 are bonded to each other with Ag paste 13 via the sealing material 7. At this time, since the sealing material 7 includes glass globules, these glass globules serve as spacers, and as a result, the glass substrate 1
A cell chamber 10 having a constant space is formed inside the sealing material 7 sandwiched by the first and the second cells 12.

Next, as shown in FIG. 12, after making cuts at the boundaries between the regions 1A and 4A to be the glass substrates 1 and 4 on the front and back sides with a carbide wheel chip, the cells are divided into individual cells 10A. To do. Then, after injecting the liquid crystal 9 into the cell chamber 10 through the injection port 8, the injection port 8 is closed to complete the liquid crystal display device.

[0008]

By the way, the completed liquid crystal display device may have a problem during use in the application device, during shipping test, and during manufacturing process. For example, if there is a defect such as a scratch on the alignment film 3 or 6 on one of the glass substrates 1 and 4 shown in FIG. All the manufacturing processes will be chucked. That is, it is necessary to check both the step of forming the sealing material 7 and the step of forming the Ag paste 13, and there is a problem that it takes time and effort.

Further, when peeling failure of the sealing material 7 occurs in the heat cycle test of the reliability test or the like, it may be due to the peeling between the glass substrate 1 on the front surface side and the sealing material 7, or the glass substrate 4 on the back surface side. It is not clear whether it is due to peeling between the seal material 7 and the seal material 7. Therefore, it is difficult to judge whether the adhesive force between the Ag paste printing side substrate and the seal material should be improved or whether the adhesive force between the seal material 7 and the seal printing side glass substrate 1 should be strengthened. There is a problem that we have to make a waste of strengthening.

Further, when there are many common defective liquid crystal display devices, such as a short circuit, it is difficult to find the cause of the defective products, which is one of the causes of lowering the yield. Was there. The present invention has been made in view of the above circumstances. Immediate improvement during the manufacturing process by eliminating the trouble of checking defects during the manufacturing process, waste, and inspecting defective finished products. An object of the present invention is to provide a method of manufacturing a liquid crystal display device that can be manufactured.

[0011]

In order to solve the above problems, the present invention employs the following manufacturing method. That is, according to the manufacturing method of the present invention, the first display pattern having a predetermined shape is formed of the transparent conductive material in each of the divided regions that are blocked in the row and column directions, and the first display pattern is individually divided. Then, the first glass substrate on which a frame-shaped sealing material having a liquid crystal injection port is formed by printing and the second glass substrate on which a second display pattern opposite to the first display pattern is formed are bonded together. Then, in the method of manufacturing a liquid crystal display device in which the display cells are divided into individual display cells, the sealing material is formed so as to be vertically (or left and right) asymmetrical, and the divisional region of the position where the display cells are divided is used. It is characterized in that an identification symbol for identifying whether or not the display pattern is formed is formed simultaneously with the display pattern.

By adopting the manufacturing method of the present invention,
The glass substrate on which the sealing material is formed can be identified, and only one glass substrate needs to be considered for checking defects and countermeasures, so the effort and waste are half compared to the conventional case. Mu. In addition, it is possible to easily determine in which area of the large glass substrate the defects frequently occur, and it is possible to easily take measures against the defects.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method of manufacturing a liquid crystal display device according to the present invention will be described below with reference to FIGS. 1 to 6, the left drawing is a top view and the right drawing is a cross-sectional view taken along the lines AA, BB, CC and DD. Further, for convenience of explanation, the transparent electrode and the alignment film are not shown.

First, as shown in FIG. 1, a transparent electrode having a predetermined shape is formed on a large first glass substrate 24 in each of the divided regions 14A and 17A which are blocked in the row and column directions. That is, the glass substrate on the front surface side and the glass substrate on the back surface side of the display cell are arranged alternately with F (front) and B (back) in order to ensure the easiness of manufacture and effective utilization. In this embodiment, the partition regions 14A and 17A are formed on the first glass substrate 24 so as to be alternately arranged in the column direction.

After forming a transparent electrode on the first glass substrate 24, an alignment film is formed on the transparent electrode. Then the first
The rectangular frame-shaped sealing material 20 is formed in the same shape by screen printing on the periphery of the plate surface of each of the partitioned areas 14A and 17A on the front and back surfaces of the glass substrate 24. At this time, the liquid crystal injection port 21 is formed, for example, in the left direction, and the sealing material 20 is formed so as to be vertically (or horizontally) asymmetrical. In this embodiment, the sealing material 2
In order to make 0 asymmetric, the convex portion 28 is provided on the upper side of the injection port 21.
Is provided.

On the other hand, as shown in FIG. 2, on the second glass substrate 25, the glass substrate on the front surface side and the glass substrate on the back surface side of the first glass substrate 24 are arranged in the same order. After forming a transparent electrode (in the order of F: front, B: back), an alignment film is formed thereon. Then
The Ag paste 26 is screen-printed on the front surface side and the rear surface side of the second glass substrate 25 on the partitioned regions 14A and 17A which will be the glass substrates.

In FIGS. 1 and 2, when the transparent electrodes are formed on the first and second glass substrates 24 and 25, the positions of the partition regions 14A and 17A are specified in regions other than the cell display region. The recognition symbol 100 is formed at the same time. Recognition symbol 1
00 is, for example, as shown in FIG. 5, A-1 ..., B-1 in the cell region serving as the back B of the first glass substrate 24.
..., C-1 ... with the identification symbol 100, and the second
Similarly, the identification area 100 of A-1 ′ ..., B-1 ′ ..., C-1 ′ ... Is given to the cell region serving as the back B of the glass substrate 25. Although the identification mark is not shown in FIGS. 1 and 2, as described above, the identification mark is added to the non-display area.

Next, as shown in FIG. 3, the front surface side and the rear surface side divided areas 14A and 17A serving as glass substrates are made to face each other so that the injection port 21 is located on the left side, and the sealing area 20 is provided between them. The first and second glass substrates 24 and 25 are brought into contact with each other. Next, heat treatment is performed, and the first and second glass substrates 24 and 25 are formed by the Ag paste 26 via the sealing material 20.
Glue each other. At this time, since the sealing material 20 includes glass globules, the glass globules serve as spacers and a cell chamber having a certain space inside the sealing material 20 sandwiched between the first and second glass substrates 24 and 25. 23 is formed.

After that, as shown in FIG. 4, the boundary between the partitioned areas 14A and 17A is cut by a cemented carbide wheel tip and then divided into individual cells 22A. After the division
After injecting the liquid crystal 22 into the cell chamber 23 through the inlet 21, the inlet 21 is closed to complete the liquid crystal display device. In the liquid crystal display device manufactured in this manner, when the injection port 21 is located on the left side and faces the glass substrate 14 on the front surface side of the cell 22A, the convex portion 28 forming the asymmetry of the sealing material 20 is formed. If it is above the axis of symmetry 27, it means that the sealing material 20 is formed on the glass substrate 17 on the back surface side. Conversely, if the convex portion 28 is below the axis of symmetry 27, the sealing material 20 is on the front surface side. The sealing material 20 is formed on the glass substrate 14.

As mentioned above, in the book manufacturing method of Ming,
As in the conventional case, a plurality of divided areas 14A and 17A to be the front and back glass substrates 14 and 17 are formed on the first and second glass substrates 24 and 25, respectively, and the glass substrates to be opposed are bonded to each other. A plurality of liquid crystal display devices can be manufactured by dividing by dividing. Moreover, since the sealing material 20 is formed asymmetrically, the substrate on which the sealing material 20 is formed can be easily identified. As a result, when investigating the defect of the alignment film, one of the glass substrates 14
Alternatively, since only the manufacturing process after the process of forming the alignment film for 17 is required to be investigated, the labor can be reduced to about half as compared with the conventional case.

Further, in the case of peeling failure, the side of the sealing material 20 or the side of the Ag paste 26 can be specified, so that the peeling strength of one glass substrate should be strengthened, which is half that in the conventional case. Will be enough. Further, since the recognition symbol 100 is formed for each divided area, even if a defect occurs in the cell, the individual position of the cell manufactured from the large-sized substrate can be discriminated. Moreover, since the F side and the B side are specified by the sealing material 20, for example, it becomes possible to clarify the distribution of the defective rate as shown in FIG. As a result, the defect occurrence area can be identified at a glance, the defect countermeasure can be taken promptly, and the yield can be easily improved.

[0022]

As described above, according to the method of manufacturing a liquid crystal display device of the present invention, the sealing material is adhered to either of the cell substrates by making the sealing material for bonding a pair of glass substrates asymmetric. Can be determined. As a result, when conducting investigations and countermeasures for defect analysis, etc., it is only necessary to consider one transparent substrate, so the labor and waste can be halved compared to the conventional case, and the work efficiency of analysis etc. is remarkable. Can be improved.

Further, according to the manufacturing method of the liquid crystal display device of the present invention, since the recognition symbol is formed for each divided area of the large glass substrate for manufacturing the cell in combination with the above-mentioned sealing material, it is manufactured. It is possible to discriminate which position of the large glass substrate the divided area was used for. As a result, when a defect occurs in the cell, the distribution of the defect rate on the large glass substrate can be clearly expressed, the defect countermeasure can be quickly taken, and the manufacturing yield can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of manufacturing a liquid crystal display device of the present invention.

FIG. 2 is a diagram showing a method for manufacturing a liquid crystal display device of the present invention.

FIG. 3 is a diagram showing a method of manufacturing a liquid crystal display device of the present invention.

FIG. 4 is a diagram showing a method for manufacturing a liquid crystal display device of the present invention.

FIG. 5 is a diagram illustrating a recognition symbol used in the method for manufacturing a liquid crystal display device of the present invention.

FIG. 6 is a diagram illustrating a recognition symbol used in the method for manufacturing a liquid crystal display device of the present invention.

FIG. 7 is a diagram showing a conventional liquid crystal display device.

FIG. 8 is a diagram showing a method of manufacturing a conventional liquid crystal display device.

FIG. 9 is a diagram showing a method of manufacturing a conventional liquid crystal display device.

FIG. 10 is a diagram showing a method of manufacturing a conventional liquid crystal display device.

FIG. 11 is a diagram showing a method of manufacturing a conventional liquid crystal display device.

FIG. 12 is a diagram showing a method of manufacturing a conventional liquid crystal display device.

[Explanation of symbols]

 14: Front-side glass substrate 14A: Front-side glass substrate partition region 17: Back-side glass substrate 17A: Back-side glass substrate partition region 20: Sealing material 21: Injection port 22: Liquid crystal 23: Cell Chamber 22A cell 24: First glass substrate 25: Second glass substrate 100: Recognition symbol

Claims (1)

[Claims] 1. A first display pattern having a predetermined shape is formed of a transparent conductive material in each divided region that is blocked in the row and column directions, and the first display pattern is divided into individual liquid crystal cells. After bonding a first glass substrate on which a frame-shaped sealant having an inlet is formed by printing and a second glass substrate on which a second display pattern facing the first display pattern is formed, In the method for manufacturing a liquid crystal display device in which the display cells are divided into the above-mentioned display cells, the sealing material is formed so as to be vertically (or left-right) asymmetric, and the division area of which position is used before the display cells are divided. A method of manufacturing a liquid crystal display device, characterized in that an identification symbol for identifying whether or not is formed simultaneously with the display pattern.