JPH03245124A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To save the labor and waste concerning the investigation of a defect analysis, etc., and the remedy thereof by forming a sealing material in such a manner that this material can be discriminated by a difference in plane shape with a symmetrical axis. CONSTITUTION:A transparent substrate 14 on a front surface side formed with transparent electrodes 15 for impressing voltages to a liquid crystal and an oriented film 16 and a transparent substrate 17 on a rear surface side formed with transparent electrodes 18 for impressing voltages to the liquid crystal and on oriented film 19 are stuck to each other via the sealing material 20 contg. many small balls of glass. The sealing material 20 is so formed as to allow the discrimination as to which to the two sheets of the transparent substrates 14, 17 stuck to each other is formed of the sealing material 20 by a difference in the plane shape with the symmetrical axis. In addition, a recogni tion symbol is formed on either one of two sheets of the transparent substrates 14, 17. On which of the transparent substrates 14, 17 of the front surface side and rear surface side is formed the sealing material 20 is easily discriminated in this way and the labor and waste are lessened at the time of the investigation of the trouble arising during use or during the test for the purpose of delivery.

Description

DETAILED DESCRIPTION OF THE INVENTION B) Industrial Application Field The present invention relates to a liquid crystal display device, and more specifically, a liquid crystal display having a cell chamber for storing liquid crystal between two transparent substrates bonded together. (b) Conventional technology FIGS. 5A and 5B are a top view and a sectional view, respectively, of a conventional liquid crystal display device.

In the figure, (L) is a glass substrate on the front side on which a transparent electrode (2) and an alignment film (3) are formed for applying a voltage to the liquid crystal, and (4) is a glass substrate for applying a voltage to the liquid crystal. The glass substrate on the back side on which the transparent electrode (5) and the alignment film (6) are formed, and the glass substrate on the front side (1) and the glass substrate on the back side <4> are a sealing material containing a large number of glass globules. (7) are bonded together. This sealing material (7) has the function of a spacer to secure a cell chamber <10> for storing the liquid crystal between the glass substrate (1) and the glass substrate (4). (8) is provided. Furthermore, (9) is a liquid crystal housed in a cell chamber (10).

Next, a method for manufacturing a liquid crystal display device will be described with reference to FIGS. 6(A) to 6(D). In addition, the same figure (A) ~ (
In D), the left figure is a top view, and the right figure is A-A, B-B, and C-C of each top view.

It is a sectional view taken along the line DD. Further, for convenience of explanation, the transparent 1, the poles (2>, (5), and the alignment films (3), (5) are not shown in the figure).

First, as shown in Figure (A), in order to ensure ease of manufacture and effective utilization, the glass substrates (1) on the front side and the glass substrates (4) on the back side are arranged alternately. After forming the transparent electrodes (2) and (5) on the first glass plate (11), the alignment films (3) and (6) are formed on the transparent electrode (2).
.

(5 areas formed on the glass substrates (1), (4) on the front side and back side (LA),
A rectangular frame-shaped sealing material <7> is formed in the same shape on the peripheral part of the plate surface of <4A) except for the liquid crystal injection port (8) by screen printing.

On the other hand, as shown in the same figure (B), the second glass plate (12
), for example, F (front), B ( After forming the transparent electrodes (2), (5) in alternating order with the transparent electrodes (back), the alignment films (3), (6) are applied to the transparent electrodes (2),
(5) Form on top. Next, areas (IA) that will become the glass substrates (1) and (4) on the front side (F side) and the back side (B side).

In order to connect the sealing material (7) of the first glass plate (11) and the transparent electrode (2) to (4A>), the sealing material (
7), screen print the Ag paste (13) in the form of, for example, dots.

Next, as shown in the same figure (C), the glass substrate on the front side (
1) and the glass substrate (4) on the back side, and
The first and second glass plates (11) and (12) are placed so that the paste (13) and the sealant (7) overlap.
Paste them together.

Next, heat treatment is performed, and the glass substrates (1) and (4) are bonded with Ag paste (13) through the sealing material (7).
glue together. At this time, since the sealing material 7〉 contains small glass spheres, these glass spheres act as spacers, and as a result, there is a constant amount of space inside the sealing material (7) sandwiched between the glass plates (11) and (12). A cell room with a space of (
10) is formed.

Thereafter, as shown in the same figure (D), the front and back sides of the glass substrate (1) are removed using a carbide wheel chip.

(4) After cutting the boundaries of the areas (LA) and (4A), they are divided into individual cells (LOA).

Next, after injecting liquid crystal (9) into the cell chamber (10) through the injection port (8), the liquid crystal (8) is sealed to complete the liquid crystal display device.

(c) Problems to be Solved by the Invention Incidentally, a completed liquid crystal display device may have a malfunction during use in an application device or during testing for shipping.

For example, if there is a defect such as a scratch on the alignment film (3) or (6) of one of the glass substrates (1) and (4) shown in Fig. 5, it is determined whether the defect was caused in the process of Therefore, all manufacturing steps after the formation of alignment film 3> or (6) will be investigated. That is, it is necessary to investigate both the process of forming the sealing material (7) and the process of forming the Ag paste (13>), which is a problem in that it is time-consuming.

In addition, if a peeling failure of the sealing material (7) occurs during a heat cycle test for reliability testing, it may be due to peeling between the glass substrate (1) on the front side and the sealing material (7>) or on the back side. I don't know if this is due to peeling between the glass substrate <4) and the sealant <7). Therefore, it is difficult to determine whether the adhesive force between the Ag paste printing side substrate and the sealing material should be improved or the adhesion force between the sealing material (7) and the seal printing side glass substrate (1) should be strengthened, and in the end both There is a problem in that there is no choice but to wastefully strengthen the adhesive force.

Therefore, the present invention has been made in view of such conventional problems, and it is possible to maintain ease of manufacture and effective utilization by determining whether the sealing material is formed on the front side or the back side of the glass substrate. It is an object of the present invention to provide a liquid crystal display device that can be easily distinguished from each other while it is in use, and that can save time and effort when investigating defects.

<2> Means for Solving the Problems The above problems are accomplished by, firstly, forming two transparent substrates, and forming a frame shape on the periphery of the plate surface of the second transparent substrate, excluding the liquid crystal injection port. the liquid crystal, which is housed in a cell chamber formed between the two transparent substrates bonded together via the sealant; The sealing material is formed so that it can be determined on which of the two substrates the sealing material is formed based on the difference in planar shape with respect to the axis of symmetry, and the recognition symbol provided on one of the substrates indicates that the cell formation from a large glass substrate is possible. This is achieved by a liquid crystal display device characterized in that it is possible to study the failure rate at a time, and secondly, the axis of symmetry according to the first invention is an axis parallel to the injection direction of the liquid crystal injection port, and the recognition symbol is This is achieved by a liquid crystal display device characterized by being made of a transparent material.

In the liquid crystal display device of the first invention, it is possible to determine which transparent substrate has the sealant formed between the two transparent substrates bonded together, based on the difference in the planar shape of the sealant with respect to the axis of symmetry. The sealing material is formed like this.

In particular, by setting the symmetry axis parallel to the liquid crystal injection direction of the liquid crystal injection port as in the second invention, ease of manufacture and effective use of the transparent plate can be maintained with the hour wheel configuration. In this case, the planar shape of the sealant of the first transparent plate and the second
For example, a projection or the like is provided on one side of the transparent plate with respect to the axis of symmetry in the vicinity of the injection port.

Furthermore, by doing so, it is possible to identify the transparent substrate on which the sealing material was formed. Therefore, when investigating defects and taking countermeasures, it is only necessary to consider one of the transparent substrates, which reduces the effort and waste by about half compared to the conventional case.

Furthermore, by using the recognition symbol, it is possible to easily determine in which region of the large glass substrate defects occur frequently, and as a result, measures against defects can be easily taken.

〈〉〈〉〈〉Example〉Examples of the present invention will be specifically explained below with reference to the drawings.

1(A) and 1(B) are both top views of a liquid crystal display device according to an embodiment of the present invention, and FIG. 1(C) is an AAl of each top view.
and BB arrow sectional view.

In the figure, (14) is a glass substrate (transparent substrate) on the front side on which transparent electrodes (15> and alignment films (16>) are formed for applying voltage to the liquid crystal, and (17>) is a glass substrate (transparent substrate) for applying voltage to the liquid crystal. A glass substrate (transparent substrate) on the back side on which a transparent electrode (18) for applying voltage and an alignment film (19) are formed, and what is the glass substrate (14) on the front side and the glass substrate (17) on the back side? They are bonded together via a sealing material (20) containing a large number of glass globules.This sealing material (20) is attached to a glass substrate (
A cell chamber (23) that houses the liquid crystal is located between (14) and (15).
), and there is only one liquid crystal injection port (21) on the left side. Furthermore, a protrusion (28) is provided near the injection port (21) for determining which glass substrate the sealing material (20) is formed on. Further, (27) is an axis of symmetry that is parallel to the liquid crystal injection direction and located at the center of the injection port (21). Note that (22) is a liquid crystal housed in the cell chamber 23).

According to the above embodiment, as shown in FIG. (28〉
If it is below the axis of symmetry (27〉), it is assumed that the sealing material (20〉) is formed on the glass substrate (17〉) on the back side. Then, conversely, as shown in the same figure <B>, In contrast, if the convex portion (28) was located above the symmetry axis 27), the sealing material (20) would have been formed on the glass substrate (14) on the front side. and sealant (2
0〉 shape 8. glass substrate (14) or (17)
) can be determined. Further, a recognition symbol (100) made of the same material as the transparent electrode, that is, ITO, is formed on the glass substrate (14) or (17).Recognition symbol<100
) is formed by alphanumeric characters, and is formed on the area where the sealing material <20> is formed or on an area other than the display pattern area.

Next, a method for manufacturing a liquid crystal display device will be described with reference to FIGS. 2(A) to 2(D). In addition, the same figure (A) ~ (
In D), the left figure is a top view, and the right figure is A-A, B-B, and C-C of each top view.

It is a sectional view taken along the line DD. Also, for convenience of explanation, transparent electrodes (15), (18) and alignment films (16), (1
9) is not shown.

First, as shown in the same figure (A), in order to ensure ease of manufacture and effective utilization, the front side glass substrate (14) and the back side glass substrate (17) are arranged such that F: front and B: back. Transparent electrodes (15), (
18) on the first glass plate (24), the alignment films (16) and (19) are formed on the transparent electrodes (15) and (1
8) Form on top. Next, each region (14A>, which will become the glass substrates (14) and (17) on the front side and the back side
(A square frame-shaped sealing material (
20) are all formed in the same shape by screen printing. At this time, an injection port (21) for the liquid crystal is formed, for example, on the left side, and a protrusion is provided above the injection port (21) to determine which glass substrate the sealing material (20) is formed on. part (28) is formed at the same time.

On the other hand, as shown in the same figure (B), the second glass plate (25
), the front glass substrate <14> and the back glass substrate (17) are arranged in the same order with respect to the first glass plate (24) (F: front, B: back). After forming the transparent electrode (Is), (18)
The alignment film (16), (20) and the transparent electrode (15),
(1 g) formed on top. Next, areas (14A
), Screen print Ag paste (26) on (17A).

In FIGS. 2(A) and (B), the glass substrate (24
) When forming transparent electrodes (15) and (18) on (25), recognition symbols (100) are similarly formed in areas other than the display area of the cell. For example, the recognition symbols (100) are formed as A-1..., B-1..., C-1... in the cell area that becomes the back B of the glass substrate (24) as shown in FIG. , A-1' . . . , B-1' . . . , C-1'
A recognition symbol (100) is formed. Figure 2 (A
Although the recognition symbol (100> is not shown in ) to FIG. 2(D), it is actually formed as shown in FIG. 3.

Next, as shown in the same figure (C), the glass substrates (14) on the front and back sides are placed so that the injection port (2I) is on the left side.
, 07) <14A) and (17A) are opposed to each other, and the first and second glass plates (24), (2
5).

Next, heat treatment is performed, and the glass plates (24) and (2) are bonded via the sealing material (20) using Ag paste (26).
5) are glued together. At this time, since the sealant (20>) contains glass beads, these glass beads act as spacers, and as a result, the inside of each sealant (20>) sandwiched between the glass plates (24) and (25) is A cell chamber (23) having a certain space is formed.

After that, as shown in the same figure (D), after making a cut at the boundary between regions (14A) and (17A) with a carbide wheel tip, this cell chamber of zero order is divided into individual cells (22A). After injecting liquid crystal (22) into (23) through the injection port (21), the injection port (21) is sealed to complete the liquid crystal display device.

In this liquid crystal display device, as shown in FIG. 2(D), when the injection port (21) is located on the left side and faces the glass substrate (14) on the front side, the convex portion <28> If it is above the axis of symmetry (27), it means that the sealing material has been formed on the glass substrate (17) on the back side, and conversely, if the convex part (28> is below the axis of symmetry (27)) , it means that the sealing material was formed on the glass substrate (14) on the front side.

As described above, according to the embodiment of the present invention, two glass plates (24) are used as a pair, as in the conventional case.

(25) Multiple front and back glass substrates <14
) , (17) (14A) , (17A
), and by bonding and dividing two paired glass substrates, a plurality of liquid crystal display devices can be formed simultaneously. Thereby, ease of manufacture and effective utilization of the glass plate can be maintained.

In particular, as in the embodiment of the second invention, by setting the axis of symmetry (27) that is parallel to the liquid crystal injection direction and passing through the center of the liquid crystal injection port (21), a W, a configuration is achieved. Manufacturability and effective utilization of the glass plate can be maintained.

Furthermore, by doing this, it is possible to easily identify the glass substrate (14) or (17>) on which the sealing material (20) was formed.
), it is only necessary to investigate the manufacturing process after the formation process of the alignment film <16) or (19>) on one of the glass substrates (14) or (17). This will save about half the effort.

Furthermore, in the case of poor peeling, it is possible to identify whether it is the sealing material (20) side or the Ag paste (26) side, so it is only necessary to strengthen the peeling strength of the corresponding one of the glass substrates. This reduces waste by about half compared to the conventional case.

Furthermore, according to the present invention, each cell is provided with an identification symbol (100) (see FIG. 3), so that the manufacturing position of each cell manufactured from a large substrate can be determined. Moreover, since the F side and the B side can be determined by the sealing material (20) as described above, it becomes possible to clarify the distribution of numerical defective rates as shown in FIG. 4, for example.

As a result, the area where defects occur can be identified at a glance, countermeasures against defects can be quickly taken, and yields can be easily improved.

(G) Effects of the Invention As described above, in the liquid crystal display device of the embodiment of the present invention, which of the pair of bonded transparent substrates the sealing material is formed on depends on the difference in planar shape with respect to the axis of symmetry. The sealing material is formed so that it can be identified.

Therefore, by doing this, it is possible to instantly identify the transparent substrate on which the sealing material was formed.

Therefore, when it comes to investigations such as failure analysis and countermeasures, it is only necessary to consider one of the transparent substrates, which reduces the effort and waste by about half compared to the conventional case.

Further, according to the present invention, each cell is provided with a recognition symbol, so that the manufacturing position of each cell manufactured from a large substrate can be determined. Furthermore, since it is possible to distinguish between the F side and the B side by the sealing material as described above, it is possible to clarify the distribution of defective rates. the result,
The area where defects occur can be identified at a glance, countermeasures against defects can be taken quickly, and yields can be easily improved.

[Brief explanation of drawings]

1A to 1C are diagrams for explaining a liquid crystal display device according to an embodiment of the present invention, and FIGS. 2A to 2C are diagrams for explaining a method for manufacturing a liquid crystal display device according to an embodiment of the present invention. Figure, Figure 3,
FIG. 4 is a diagram showing recognition symbols of the present invention, and FIG. 5 A and B are
FIGS. 6A to 6A are diagrams illustrating a conventional liquid crystal display device and a method for manufacturing a conventional liquid crystal display device. (1)...Glass substrate on the front side, (IA), (
14A)...A region that will become the glass substrate on the front side, (2
), (5), (15), (18)...transparent electrode, (3), (6), (16), (
19)...Alignment film, (4)...Glass substrate on the back side, (4A). (17A)...A region that will become the glass substrate on the back side, (
7). (20>...Sealing material, (8), (21)...
- Inlet, (9). (22)...Liquid crystal, (10), (23)...
Cell chamber, <10A). (22A)...Cell, (11>, (24)...
・First glass plate, (12), (25)...second
(13), (26)...Ag paste, (14)...Glass substrate on the front side (transparent substrate), (17)...Glass substrate on the back side (transparent substrate)
, ri27〉...Axis of symmetry, (28>...Convex part,
(100)...Recognition symbol.

Claims (3)

[Claims] (1) Two transparent substrates, a sealing material formed in a frame shape around the plate surface of one of the transparent substrates, excluding the liquid crystal injection port, and a sealing material bonded together through the sealing material. and the liquid crystal housed in a cell chamber formed between two transparent substrates, and which of the two bonded transparent substrates the sealing material is formed on depends on the planar shape with respect to the axis of symmetry. The sealing material is formed so that it can be distinguished by the difference in
A liquid crystal display device characterized in that a recognition symbol is formed on one of the two transparent substrates. (2) The liquid crystal display device according to claim 1, wherein the recognition symbol is made of a transparent material and is formed outside the display pattern area. (3) The liquid crystal display device according to claim 1, wherein the axis of symmetry is an axis parallel to the injection direction of the liquid crystal at the liquid crystal injection port.