JPH08201825A - Liquid crystal injecting structure of liquid crystal cell, liquid crystal cell, and its manufacture - Google Patents

Abstract

PURPOSE: To reduce poor workmanship of the dividing works for two electrode substrate boards of a liquid crystal cell by forming a liquid crystal spread preventing wall separately from the seal provided between the two electrode base boards. CONSTITUTION: A liquid crystal cell concerned is formed by laminating an upper electrode substrate board 10 and lower electrode substrate board 30 while a band-shaped seal 20 is interposed. A liquid crystal injection port 40 is formed from the two ends 21 of this seal and the upper and lower boards 10, 30. A spread preventing wall 50 is provided on the lower board 30 in the neighborhood of the liquid crystal injection port 40. In the liquid crystal injecting process, the cell is accommodated in a vacuum vessel, and upon evacuating the cell, the liquid crystal is dripped from the injection port 40. At this time, the wall 50 is formed higher than the thickness of the seal 20, so that the dripping liquid crystal is injected into the cell without the risk of overflowing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal cell suitable for use in liquid crystal display devices, liquid crystal shutters and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid crystal cell, as shown in Japanese Patent Publication No. 6-14157, a liquid crystal injection port is provided in a part of a pair of electrode substrates stacked with a seal therebetween. , One of the electrode substrates is made larger so as to extend from the liquid crystal injection port side than the other electrode substrate, and a liquid crystal spread prevention wall is arranged on the extended portion in the vicinity of the liquid crystal injection port. There is one configured like this. Here, the spread preventing wall is integrally formed by printing the same material as the seal when screen-printing the seal.

[0003]

By the way, in order to improve productivity, the liquid crystal cell is generally manufactured by taking a large number of pieces. Therefore, the present inventor tried to manufacture the liquid crystal cell having the above-described structure, taking a case of taking two liquid crystal cells as an example.
First, as shown in FIGS. 12 and 13, the alignment films 1a and 2a are formed on the inner surfaces of the large-sized substrates 1 and 2 made of a glass material, respectively, through a plurality of unillustrated electrodes. Then, firing rubbing treatment is applied to these alignment films.

Next, the spacers 3 are spread over the entire inner surface of the upper large-sized substrate 1 (see FIG. 12). on the other hand,
On the inner surface of the lower large-sized substrate 2, a seal 4 is screen-printed along the outer periphery of the alignment film 2a with a thermosetting epoxy resin adhesive in a strip shape (see FIG. 13). Here, in the seal 4, a double spread preventing wall 4a is integrally formed on the inner surface of the lower large-sized substrate 2 at a portion corresponding to the liquid crystal inlet of the liquid crystal cell.

Next, the large substrates 1 and 2 on both the upper and lower sides are shown in FIG.
Then, the seal 4 is cured by superimposing it as shown in FIG. After that, in order to realize the final shape of the liquid crystal cell, a dividing line is added to the outer surface of the upper large-sized substrate 1 by a scribe process as shown by a chain double-dashed line in FIG. On the other hand, a dividing line is formed on the outer surface of the lower large-sized substrate 2 at the center in the left-right direction. Next, the large substrates 1 and 2 on both upper and lower sides are divided along this dividing line to form the liquid crystal cell shown in FIG.

However, in such a liquid crystal cell,
Since the seal 4 adheres to the inner surface of the upper large-sized substrate 1 when the seal 4 cures as described above, each spread prevention wall 4a also adheres to the inner surface of the upper large-sized substrate 1. Therefore, in the above dividing process, even if an attempt is made to divide the portion of the upper large-sized substrate 1 shown by the diagonal lines in FIG. 15 across each spread preventing wall 4a along the dividing line, The bonded portion is not divided and remains as shown by reference numeral 1b in FIG.

Therefore, not only the appearance of the liquid crystal cell is impaired, but also the liquid crystal cannot be properly injected. Even if the substrates can be separated, the gap between the upper and lower large substrates 1 and 2 after the upper and lower large substrates 1 and 2 are overlapped and the seal 4 is cured is about 2 to 10.
It is in the range of μm. For example, the gap is about 2 μm in the case of FLC type or AFLC type liquid crystal cell, and
In the case of FT type liquid crystal cell, it is about 5 μm, and ST
In the case of an N type or TN type liquid crystal cell, it is about 5 to 10 μm.

Therefore, the height of each expansion preventing wall 4a is also limited to a low value of about 2 to 10 μm. Therefore, even if the liquid crystal is dropped between the spread prevention walls 4a and is injected from the liquid crystal injection port (indicated by reference numeral 5 in FIG. 13),
When the amount of dropping is large, it flows over the spread preventing wall 4a to the outside. On the other hand, if the dropping amount is small, bubbles are mixed with the liquid crystal in the liquid crystal cell. For this reason, there is a problem that a device with high dropping accuracy must be adopted.

On the other hand, as shown in FIG. 17, it may be considered that the upper large-sized substrate 1 is preliminarily made into a dimensional shape in which the hatched portion in FIG. 15 is divided, and then superposed on the lower large-sized substrate 2. However, the seal 4 printed as described above
As it is, the printing height of each spread prevention wall 4a is usually
It reaches only 10 to 30 μm. Therefore, each of the spread prevention walls 4a does not serve as a prevention wall, and if the liquid crystal is dropped and injected between them, the same problem as described above occurs.

In view of the above, the first object of the present invention is to provide a liquid crystal cell in which a liquid crystal spread prevention wall is formed separately from a seal between both electrode substrates. To do. A second object of the present invention is to provide a method of manufacturing a liquid crystal cell, in which a liquid crystal spread preventing wall is formed after the divided electrode substrates of the liquid crystal cell are divided and before the liquid crystal is injected.

[0011]

In order to achieve the above object, in the invention described in claim 1, a first electrode substrate (10) and a seal (20) provided in a strip shape on the first electrode substrate. And a seal (20) on the first electrode substrate (10)
A second electrode substrate (3) which is overlapped with each other to form a liquid crystal-filled cavity and also forms a liquid crystal injection port (40) into the liquid crystal-filled cavity between both ends (21) of the seal (20).
0) and one of the first and second electrode substrates (10, 30) (30) extends from the liquid crystal injection port (40) side to the outside of the other electrode substrate (10). The extension plate portion has a liquid crystal spreading prevention wall (50) formed separately from each end of the seal (20) separately from the seal (20). A liquid crystal injection structure is provided.

Further, in the invention described in claim 2, in the liquid crystal injection structure of the liquid crystal cell according to claim 1, the height of each spread prevention wall (50) is thicker than the thickness of the seal (20) while the other. It is characterized in that it is not more than the plate thickness of the electrode substrate (30). Further, in the invention described in claim 3,
Alternatively, in the liquid crystal injection structure of the liquid crystal cell according to the item 2, each end (21) of the seal (20) has an auxiliary seal portion (21a), and each spread prevention wall (50) includes each auxiliary seal portion (21a). ) Is formed in contact with.

According to the invention of claim 4,
The first electrode substrate (10), the seal (20) provided in a strip shape on the first electrode substrate, and the first electrode substrate (10) are overlapped with each other via the seal (20) to form a liquid crystal filled cavity. And a second electrode substrate (30) forming a liquid crystal injection port (40) into the liquid crystal filling space between both ends (21) of the seal (20), and the first and second electrode substrates ( 1
One of the (0, 30) (30) is provided with an extension plate portion extending from the liquid crystal injection port (40) side to the outside of the other electrode substrate (10). Spread prevention wall (5
0) is formed separately from the seal (20) and extends from each end of the seal, and the liquid crystal is introduced through the spread prevention wall (50) and the liquid crystal inlet (40). A liquid crystal cell enclosed in a liquid crystal enclosure is provided.

Further, in the invention described in claim 5,
A first original substrate (1) having a plurality of electrode substrates (10),
A first step (S5) of forming a band-shaped seal (20) corresponding to each electrode substrate (10), and a second original having an electrode substrate (30) facing each electrode substrate (10). The substrate (2) is inserted through each seal (20) first
A second step of forming each liquid crystal-filled cavity on the original substrate (1) and forming a liquid crystal injection port (40) into each liquid crystal-filled cavity between both ends of each seal (20). After (S6) and this second step, the first and second original substrates (1, 2) are separated to form a plurality of liquid crystal cell shapes on both opposite electrode substrates (10, 30) through the seal (40). ) And the liquid crystal injection port (4
The third step (S9) of forming a liquid crystal cell shape by providing an extension plate portion extending from the (0) side to the outside of the other counter electrode substrate (10), and after the third step, each of the above A fourth step (S10) of forming liquid crystal spread prevention walls (50) extending from both ends (21) of each seal (20) on the extension plate portion, and both spread prevention walls (50) and A fifth step (S11) of injecting a liquid crystal into each of the liquid crystal-filled voids through each of the liquid crystal injection ports (40) is provided.

Further, in the invention described in claim 6, in the method of manufacturing a liquid crystal cell according to claim 5, the fourth step (S
10) is characterized in that the spread preventing wall (50) is formed of an adhesive. Further, the invention according to claim 7 is characterized in that, in the method for producing a liquid crystal cell according to claim 6, the adhesive is one of an instant adhesive and an epoxy resin adhesive.

Further, in the invention described in claim 8, in the method of manufacturing a liquid crystal cell according to any one of claims 5 to 7, in the fourth step (S10), each spread prevention wall (50) is It is characterized in that it is formed to be thicker than the thickness of each seal (20) and equal to or less than the plate thickness of the electrode substrate (10, 30).

Further, in the invention described in claim 9, in the method for manufacturing a liquid crystal cell according to any one of claims 5 to 8, in the first step (S5), each seal (20) is
Both ends (21) are formed to have an auxiliary seal portion (21a) facing the inner end of each spread prevention wall (50), and both spreads are formed in the fourth step (S10). The prevention wall (50) is formed so as to extend from each auxiliary seal portion (21a) of each seal (20).

The reference numerals in parentheses of the above constituent elements indicate the corresponding relationship with the concrete constituent elements described in the embodiments described later.

[0019]

In the liquid crystal injecting structure of the liquid crystal cell according to the first aspect of the present invention configured as described above, the extending plate portion of one electrode substrate has a liquid crystal spread preventing wall different from the seal. A body is formed to extend from each end of the seal. By forming the spread prevention wall separately from the seal in this way, the spread prevention wall can be formed on the extension plate portion.
It can be performed after the liquid crystal cell shape is divided. For this reason, the final shape of the liquid crystal cell can be appropriately divided and formed without causing a dividing defect that occurs when the spread prevention wall is formed simultaneously with the seal.

As a result, the liquid crystal can be properly injected from the liquid crystal injection port by dropping the liquid crystal between the two spread prevention walls into the liquid crystal filled space. In addition, as described above, the dividing failure does not occur, so that the appearance of the liquid crystal cell is not spoiled. Further, according to the liquid crystal injection structure of the liquid crystal cell according to the second aspect, the dropped liquid crystal is retained between the spread prevention walls without increasing the accuracy of the amount of the liquid crystal dropped between the spread prevention walls. be able to. Therefore, the liquid crystal can be injected into the liquid crystal-filled space from the liquid crystal injection port without flowing out beyond the spread prevention wall. Further, the expansion preventing wall does not project outward from the other electrode substrate.

Further, according to the liquid crystal injection structure of the liquid crystal cell according to the third aspect, the injection of the dropped liquid crystal into the liquid crystal filling space is performed between the respective ends of the seal and the inner ends of the respective expansion preventing walls. It can be performed accurately without the inclusion of bubbles through the boundary.
Further, according to the method of manufacturing a liquid crystal cell according to any one of claims 5 to 7, a seal is formed in a strip shape on the first original substrate so as to correspond to each electrode substrate thereof, and the second original substrate is provided with each seal interposed therebetween. Each liquid crystal injection cavity is formed by being superposed on the first original substrate, and each liquid crystal injection port is formed between both ends of each seal. After that, the first and second original substrates are divided, and a plurality of liquid crystal cell shapes are formed such that one of the opposite electrode substrates is provided with an extending plate portion, and then the spread prevention wall is provided with each seal. Is formed on each of the extending plate portions so as to extend from both ends thereof. Then, the liquid crystal is injected into the respective liquid crystal-filled voids through the respective double spread prevention walls and the respective liquid crystal inlets.

As described above, the formation of each spreading prevention wall on the extension plate portion is performed after the division of each liquid crystal cell shape. Therefore, in taking a plurality of liquid crystal cells, there is no separation failure that occurs when the spread prevention wall is formed at the same time as each seal in the separation forming step of each liquid crystal cell shape. As a result, it is possible to accurately inject the liquid crystal into the liquid crystal-filled space from the liquid crystal injection port by dropping the liquid crystal between the respective spread prevention walls. In addition, as described above, the dividing failure does not occur, so that the appearance of each liquid crystal cell is not damaged.

According to the method of manufacturing a liquid crystal cell described in claim 8, it is possible to obtain a plurality of liquid crystal cells while ensuring the effect of the invention described in claim 2. Further, according to the method for manufacturing a liquid crystal cell described in claim 9, it is possible to obtain a plurality of liquid crystal cells while ensuring the effect of the invention described in claim 3.

[0024]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a liquid crystal cell according to the present invention. This liquid crystal cell includes an upper electrode substrate 10 and a lower electrode substrate 30 that is superposed on the upper electrode substrate 10 via a strip-shaped seal 20, and the lower electrode substrate 30 is the upper electrode substrate 10.
Has a larger surface area. Here, the seal 20 is
At both ends 21, between the upper and lower electrode substrates 10 and 30,
The liquid crystal injection port 40 is formed.

In the extension plate portion of the upper electrode substrate 10 of the lower electrode substrate 30 in the vicinity of the liquid crystal injection port 40, double spread preventing walls 50 are formed as shown in FIGS. 1 and 2. Liquid crystal is filled in a liquid crystal filled space formed between the upper and lower electrode substrates 10 and 30 and the seal 20. Next, a method for manufacturing the liquid crystal cell configured as described above will be described with reference to FIGS. Here, the case of taking two liquid crystal cells is taken as an example.

First, the upper large substrate 1 and the lower large substrate 2 (see FIGS. 4, 5, 12 and 13) that have been cleaned are prepared. In addition, on the inner surfaces of the upper and lower large substrates 1 and 2,
A plurality of electrodes (not shown) are formed at the formation positions of each alignment film described later. Then, in the alignment film printing step S1 of FIG. 3, both alignment films 1a are printed on the inner surface of the upper large-sized substrate 1 via the respective electrodes, and both alignment films 2a are printed on the inner surface of the lower large-sized substrate 2 via the respective electrodes. To print. Next, in the alignment film baking step S2 and the rubbing step S3, each alignment film 1a, 2a is subjected to a baking process and a rubbing process.

After that, in the spacer spraying step S4,
As shown in FIG. 4, while the spacers 3 are sprayed on the inner surface of the upper large-sized substrate 1, in the seal printing step S5, the seal 20 is provided with a thermosetting epoxy resin adhesive as shown in FIG. Screen printing is performed on the inner surface of the lower large-sized substrate 2 in a strip shape. Here, the seal 20 is printed along the outer periphery of the alignment film 2a.
Both end portions 21 are located on both sides of a liquid crystal injection port 40 described later. The width of the seal 20 is about 3 mm.

Then, in the superposing step S6, the upper large substrate 1 and the lower large substrate 2 are attached to the spacer 3 and the seal 20 so that the respective alignment films 1a and 2a face each other.
Through (see FIG. 6). As a result, the liquid crystal filling space and the liquid crystal injection port 40 are formed. Then, in the next seal curing step S7, the seal 20 is cured in a high temperature tank at 180 ° C. for 1 hour.

After the processing in the seal curing step S7 is completed in this way, in the scribe step S8,
A dividing line for taking two liquid crystal cells is drawn on the outer surface of the upper large-sized substrate 1 as shown by a chain double-dashed line in FIG. On the other hand, a dividing line is formed on the outer surface of the lower large-sized substrate 2 at the center in the horizontal direction in the drawing. Then, in a dividing step S9, the upper and lower large substrates 1, 2 are subjected to a dividing process along the dividing line to form a final shape of the liquid crystal cell shown in FIG.

As described above, since the double spread preventing walls 50 are formed on the extended plate portion of the lower large-sized substrate 2, the dividing process is performed after the upper and lower glass substrates 1 and 2 are superposed. This dividing process includes the dividing in the vicinity of the liquid crystal injection port 40 without causing a dividing defect due to the presence of the spread prevention wall.
It can be done properly. Therefore, the appearance of the final shape of the liquid crystal cell is not impaired.

After that, in the step S10 of forming the spread prevention wall, as shown in FIG.
It is applied and formed on the extended plate portion separately from the seal 20 so as to face both ends 21 of the seal 20. in this case,
The application of the instant adhesive is performed using a dispenser or a stick. As a result, compared with the case where both spread prevention walls 50 are formed by screen printing at the same time as the seal 20 using the same material as the material forming the seal 20, the height and the like of the spread prevention wall 50 can be provided with sufficient shape and dimensions. You can take

In this embodiment, the width W of each spread prevention wall 50 is
And the length L are about 3 mm and 5 mm, respectively,
The height H of each spread prevention wall 50 is a value that functions as a prevention wall and does not exceed the thickness of the lower large-sized substrate 2, that is,
It was set to 0.5 mm or more and 1.0 mm or less (see FIG. 9).
An acrylic UV-curable adhesive was used as the instant adhesive. The reason is that this adhesive can be cured instantaneously (for example, several tens of seconds) by irradiating with ultraviolet rays, and the process time can be shortened.

After the step S10 of forming the expansion preventing wall is completed, in the liquid crystal injection step S11, the liquid crystal is injected into the liquid crystal cell as follows. First, a liquid crystal cell and liquid crystal are housed in a vacuum container. Then, the vacuum container is evacuated. After the evacuation is completed, the liquid is dropped between the spread prevention walls 50 by a general-purpose liquid crystal dropping device.

In this case, the spread prevention wall 50 has the function of the seal 20 as described above so that the spread prevention wall 50 functions as the prevention wall.
Since it is formed thicker than the thickness of the liquid crystal, the dropped liquid crystal does not spread over the spread preventing wall 50 to the outside,
Retain between the spread prevention walls 50. Therefore, it is not necessary to increase the liquid crystal dropping accuracy, and the liquid crystal dropping amount may be adjusted to the extent that bubbles are not mixed into the liquid crystal cell. Further, since the height of each spread prevention wall 50 is set so as not to exceed the plate thickness of the lower large-sized substrate 2, each spread prevention wall 50 does not project from the surface of the upper substrate 10.

After that, if the inside of the vacuum vessel is returned to atmospheric pressure, the capillary phenomenon utilizing the pressure difference between the inside of the liquid crystal cell causes
The liquid crystal staying between the spread preventing walls 50 can be injected into the liquid crystal cell through the liquid crystal injection port 40. Next, a modified example of the above-described embodiment will be described with reference to FIG. 10. In this modified example, both auxiliary seal portions 21a are provided at both ends thereof with the double-spreading prevention wall 50 described in the above-described embodiment. The seal 20 is formed so as to extend from both end portions 21 of the seal 20 so that it can be easily integrated with each inner end portion.

Here, the width of each auxiliary seal portion 21a is
Each end portion 21 of the seal 20 is provided so as not to cause a disconnection failure.
Is smaller than the width of, for example, about 0.5 mm. Further, the tip of each auxiliary seal portion 21a is arranged to extend outside the liquid crystal injection port side end surface after the upper large-sized substrate 1 is divided. The configuration in which each auxiliary seal portion 21a is integrally formed with the seal 20 in this way is realized by the printing process in the sticker printing step S5 in the above-described embodiment.

In forming the spread prevention walls 50 in the spread prevention wall forming step S10, as described above, the tips of the auxiliary seal portions 21a are located closer to the liquid crystal injection port side end surface after the upper large-sized substrate 1 is divided. Since it extends to the outside, the instant adhesive can be easily applied so as to be integrated with each auxiliary seal portion 21a. According to this modification example configured in this manner, the following excellent effects are obtained as compared with the above-described embodiment.

That is, in the above embodiment, the both ends 21 of the seal 20 have the seal printing step S5 as shown in FIG.
Upper large substrate 1 due to variations in printing process in
When formed on the inner side of the end face of the liquid crystal injection port after the division of the liquid crystal, each spread prevention wall 50 and the seal 20 are filled at the time of liquid crystal injection.
There is a risk that air bubbles may enter through the gaps between the boundaries with the respective end portions 21a. For this reason, the instant adhesive is
It is necessary to confirm that it has penetrated between the two and has come into contact with each end of the seal 20 and has been cured.

However, according to the present modification, the auxiliary seal portion 21a fills the gap at the boundary between each spread prevention wall 50 and each end 21a of the seal 20. This allows
Each spread prevention wall 50 and each corresponding end 21a of the seal 20 are integrated. Therefore, when injecting the liquid crystal into the liquid crystal cell as in the above-described embodiment, it is possible to reliably prevent air bubbles from entering the liquid crystal cell through the gaps between the end portions 21 of the seal 20 and the spread preventing walls 50. it can.

Further, it is not necessary to confirm the infiltration of the instant adhesive between the large-sized substrates as described above and to consider the use of a low-viscosity adhesive as the adhesive in order to facilitate the infiltration. In the above embodiment, the spread prevention wall 50 is formed of the instant adhesive, but instead of this, for example, a thermosetting epoxy resin adhesive is used to form the spread prevention wall 50 for a long time. You may form.

Further, in the above embodiment, the seal 20 is formed by the thermosetting epoxy resin adhesive, but instead of this, the seal 20 is formed by, for example, an acrylic ultraviolet curing instant adhesive. You may implement it so that it may be formed between both substrates. Further, in the above embodiment, the lower electrode substrate 30 is made larger than the upper electrode substrate 10, and the extension plate portion is formed on the lower electrode substrate 30.
Alternatively, the upper electrode substrate 10 may be made larger than the lower electrode substrate 30, and the extension plate portion may be formed on the upper electrode substrate 10.

[Brief description of drawings]

FIG. 1 is a perspective view of a liquid crystal cell showing an embodiment of the present invention.

2 is a fragmentary plan view of the liquid crystal cell of FIG.

FIG. 3 is a process drawing showing a manufacturing process of the liquid crystal cell of FIG.

FIG. 4 is a perspective view showing an alignment film formation state and a spacer dispersion state of the upper large-sized substrate in the alignment film printing step and the spacer dispersion step of FIG.

5 is a perspective view showing a seal printing state on a lower large-sized substrate in the seal printing process of FIG.

FIG. 6 is a perspective view showing a state where the upper and lower large substrates are superposed in the superposing step of FIG.

FIG. 7 is a plan view showing a state in which a dividing line is added in the scribing process of FIG.

8 is a perspective view of the liquid crystal cell divided in the dividing step of FIG.

9 is a perspective view showing a formation state of the spread prevention wall in the spread prevention wall forming step of FIG.

FIG. 10 is a fragmentary plan view showing a modification of the above embodiment.

FIG. 11 is a partially cutaway plan view showing a state in which both ends of the seal in the above embodiment are formed inside the liquid crystal injection port side end surface after the upper large-sized substrate is divided.

FIG. 12 is a perspective view showing a state in which an alignment film is formed on a conventional large-sized upper substrate and spacers are scattered.

FIG. 13 is a perspective view showing a state in which an alignment film is formed on a conventional lower large-sized substrate and a seal is screen-printed.

14 is a perspective view showing a state in which the upper large-sized board of FIG. 12 is superimposed on the lower large-sized board of FIG.

FIG. 15 is a perspective view showing a state in which the upper and lower large substrates in the superposed state of FIG.

16 is a perspective view of the liquid crystal cell showing a state in which the liquid crystal cell is divided along the division line in FIG.

FIG. 17 is a perspective view showing a state in which each of the spread prevention walls is formed after the conventional large pre-separated upper large substrate is combined with the lower large substrate.

[Explanation of symbols]

1-upper large substrate, 2-lower large substrate, 10-
..Upper electrode substrate, 20 ... Seal, 21 ... Both ends, 21a ... Auxiliary seal portion, 30 ... Lower electrode substrate, 40 ... Liquid crystal injection port, 50 ... Spread prevention wall.

Claims (9)

[Claims] 1. A first electrode substrate, a strip-shaped seal provided on the first electrode substrate, a first liquid crystal substrate and a seal which are superposed on the first electrode substrate via the seal to form a liquid crystal-filled space, and both ends of the seal. A second electrode substrate that forms a liquid crystal injection port into the liquid crystal filling space between the parts, and one of the first and second electrode substrates is outward from the liquid crystal injection port side to the other electrode substrate. The extension plate portion extends to the liquid crystal, and the extension plate portion has a liquid crystal spread prevention wall formed separately from each end of the seal separately from the seal. Cell liquid crystal injection structure. 2. The liquid crystal injection structure for a liquid crystal cell according to claim 1, wherein the height of each of the spread prevention walls is greater than the thickness of the seal and equal to or less than the plate thickness of the other electrode substrate. . 3. The seal according to claim 1, wherein each end portion of the seal has an auxiliary seal portion, and each spread preventing wall is formed in contact with each auxiliary seal portion. Liquid crystal injection structure of liquid crystal cell. 4. A first electrode substrate, a strip-shaped seal provided on the first electrode substrate, and a first liquid crystal sealing space which is superposed on the first electrode substrate via the seal to form a liquid crystal-filled space and both ends of the seal. A second electrode substrate that forms a liquid crystal injection port into the liquid crystal filling space between the two parts, one of the first and second electrode substrates being closer to the liquid crystal injection port than the other electrode substrate. The extending plate portion is provided with an extending plate portion extending outward, and a liquid crystal spreading preventing wall is formed separately from each end of the seal on the extending plate portion, separately from the seal. A liquid crystal cell in which the liquid crystal is injected into the liquid crystal-filled space through the expansion prevention wall and a liquid crystal injection port. 5. A first original substrate having a plurality of electrode substrates,
A first step of forming a band-shaped seal corresponding to each of the electrode substrates, and a second original substrate having an electrode substrate facing each of the electrode substrates, and being formed on the first original substrate through each of the seals. A second step of forming the liquid crystal-filled cavities by overlapping and forming a liquid crystal injection port into each of the liquid crystal-filled cavities between both ends of each seal, and the first step after the second step And the second original substrate is divided to form a plurality of liquid crystal cell shapes, both counter electrode substrates having the seals interposed therebetween, and one counter electrode substrate being outside the liquid crystal injection port side than the other counter electrode substrate. A third step of forming an extension plate portion extending in one direction, and after the third step, spread of liquid crystals extending from both ends of each seal to each extension plate portion. A fourth step of forming a prevention wall, and A fifth step of injecting a liquid crystal into each of the liquid crystal-filled cavities through both of the spread prevention walls and each of the liquid crystal injection ports. 6. The spread preventing wall is formed of an adhesive in the fourth step.
The method for producing a liquid crystal cell according to item 1. 7. The method of manufacturing a liquid crystal cell according to claim 6, wherein the adhesive is one of an instant adhesive and an epoxy resin adhesive. 8. In the fourth step, each of the spread prevention walls is formed to have a height greater than a thickness of each of the seals and equal to or less than a plate thickness of the electrode substrate. 8. The method for producing a liquid crystal cell according to any one of 7. 9. In the first step, each of the seals is formed at both ends thereof so as to respectively project an auxiliary seal portion facing the inner end of each of the spread preventing walls, and 9. The liquid crystal cell manufacturing method according to claim 5, wherein in the fourth step, each of the spread preventing walls is formed so as to extend from each of the auxiliary seal portions of each of the seals. Method.