JPH1184399A - Liquid crystal panel and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the spreading of the cell gap of an injection port at the time of injection and to suppress the orientation defect from seals by disposing at least one piece of island-shaped seals within a liquid crystal introduction region enclosed by the external seal and a scribing line at the front end of the external seal. SOLUTION: A pair of substrates 1, 1a arranged to face each other via a prescribed spacing are stuck to each other by a sealing material 2 and the liquid crystals 9 are sealed into the effective region 5 within the substrate spacing enclosed by the sealing material 2. The injection port 4 for injecting the liquid crystals 9 is opened in part of the circumference of the effective region 5 within the spacing of the substrates 1, 1a and is provided with the internal seal 2. The external seal 3 is disposed toward the outer side from both ends of the injection port 4 of the internal seal 2. Further, the liquid crystal introduction region 7 enclosed by the external seal and the scribe line 6 at the front end of the external seal 3 is internally provided with at least one piece of the island-shaped seals 8. The shape of the island-shaped seals 8 is particularly preferably a circular shape or such an elliptic shape of which the major axis is made to parallel to the external seal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel and a method of manufacturing the same, and more particularly, to a seal shape of a liquid crystal panel used for a display and a shutter and a method of manufacturing a liquid crystal panel having the seal shape.

[0002]

2. Description of the Related Art Conventionally, when a liquid crystal panel is formed, the shape of a seal is formed for the purpose of sealing the liquid crystal and for bonding a substrate facing the liquid crystal panel. And an internal seal 2 provided around an effective area 5 for enclosing the liquid crystal, and an opening 4 for injecting a liquid crystal in a part of the part facing one side of the substrate 1. The outer seal 3 is provided vertically from both ends toward the outside, and the tip of the outer seal 3 extends to the scribe line 6 or as shown in JP-A-5-2324. Shape. As the sealing material, there are a thermosetting type and a UV curing type, and both types are used depending on a problem in a process and an actual use environment of the panel.

[0003] In many cases where a vacuum injection method is used, the shape of an injection port for injecting liquid crystal is as shown in FIG. 5 described above. However, the injection port does not need to be one on one side of the substrate, and two or more injection ports may be formed. (Japanese Unexamined Patent Publication Nos. H5-165039 and H8-122796) In some cases, one side is all treated as an inlet, and the shape of the seal at that time is such that the effective area 5 as shown in FIG. There was no problem even if the shape of the surrounding inner seal 2 facing the one side of the substrate 1 was entirely formed as the injection port 4a. Speaking only from the shape of the seal, there is also a case where the seal is formed at a portion where the sealing material does not enter as described in JP-A-8-146441 in order to suppress the influence of the sealing material.

[0004]

However, with such a shape, when the liquid crystal is injected, the strength at which the cell gap between the opposing substrates at the injection port is maintained is partially reduced. When the liquid crystal is specifically injected, the injection port becomes thick and the cell gap is deteriorated, and the alignment material is defective because the sealing material is close to the effective area.

[0005] Further, in a seal shape as shown in FIG.
Since the amount of liquid crystal used at the time of injection increases, and the liquid crystal at the time of injection has an arc-shaped wavefront with a central portion protruding in the traveling direction, there is a problem that final injection unevenness occurs.

[0006] Further, when a seal is provided considerably inside the substrate edge of the substrate matched at the time of forming the seal,
The air in the cell could not be sufficiently exhausted due to the heat at the time of curing the seal, resulting in a defect that the cell gap was thickened and expanded.

The above disadvantages are considered to be caused by the following reasons. Normally, when forming a liquid crystal panel, a desired film such as a transparent electrode, an alignment film, and an insulating film is formed on a substrate,
A spacer for forming a gap is sprayed on at least one substrate, and a seal for bonding the two substrates is formed on the other substrate. The seal also serves to confine the liquid crystal, and is formed so that there is no gap except for the injection port. (See FIG. 5) Liquid crystal is injected into the cell from the injection port, and the cell is sealed to form a panel. When the liquid crystal is injected, the injection port is expanded by the liquid crystal and filled with the liquid crystal. Therefore, it is considered that the cell gap on the injection port side is widened and becomes larger than the cell gap on the opposite side.

When the opening of the injection port is narrow or the viscosity of the liquid crystal is low, this phenomenon is unlikely to occur. However, the injection speed becomes extremely slow, which is a great obstacle to productivity, and the viscosity of the liquid crystal is low. Or a desired function may not be obtained. Therefore, a liquid crystal having a certain width of the inlet and a certain viscosity is used. At this time, a defect that the cell gap of the inlet is widened occurs. If a seal is provided at the position of the injection port 4 near the effective area, the presence of the seal causes disorder in orientation at the time of injection, resulting in a defect.

Furthermore, when the seal is cured, the air trapped in the bonded panel has a shape as shown in FIG. 5, which makes it difficult to be exhausted. As a result, the cell becomes thicker or the pressure at the time of evacuation becomes lower. The most serious defect was that the area near the injection port became thicker. This tendency becomes more noticeable as the cell gap becomes thinner.

The present invention has been made in order to improve such disadvantages of the prior art, and can sufficiently cope with a liquid crystal having a high viscosity without narrowing an injection port. It is an object of the present invention to provide a liquid crystal panel which suppresses the expansion of the cell gap at the injection port and alignment defects from the seal, and a method for manufacturing the same.

[0011]

That is, according to the present invention, a pair of substrates arranged to face each other with a predetermined space therebetween is bonded with a sealing material, and the pair of substrates is bonded to an effective area in a substrate gap surrounded by the sealing material. A liquid crystal panel in which liquid crystal is sealed,
An inner seal provided by opening an inlet for injecting liquid crystal into a part of the effective area in the substrate gap, an outer seal provided outward from both ends of the inlet of the inner seal, A liquid crystal panel characterized in that at least one island-shaped seal is provided in a liquid crystal introduction region surrounded by an external seal and a scribe line at a tip of the external seal.

Further, according to the present invention, in the above-mentioned liquid crystal panel, the island-shaped seal is provided so as to protrude outside the scribe line in the liquid crystal introduction region partially surrounded by the external seal and the scribe line at the end of the external seal. Liquid crystal panel.

Further, the present invention provides a liquid crystal panel in which a pair of substrates arranged facing each other with a predetermined space therebetween are bonded with a sealing material, and a liquid crystal is sealed in an effective area within a gap between the substrates surrounded by the sealing material. A manufacturing method, comprising: an inner sealing material having an injection port for injecting liquid crystal into a part of a substrate around an effective area in a substrate gap; and an outer opening from both ends of the injection port of the inner sealing material. An external sealing material is provided, and at least one island-shaped sealing material is provided in a liquid crystal introduction region surrounded by the external sealing material and a scribe line at the tip of the external sealing material, and then bonded to the other substrate. A method of manufacturing a liquid crystal panel characterized by the following.

According to the present invention, in the above-mentioned method for manufacturing a liquid crystal panel, the island-shaped sealing material may be partially replaced with a scribe line in a liquid crystal introduction region surrounded by an external sealing material and a scribe line at the tip of the external sealing material. A liquid crystal panel manufacturing method characterized by sticking out a substrate after protruding outside the substrate.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of the first liquid crystal panel of the present invention. FIG. 1A is a schematic plan view, and FIG.
(B) is a schematic sectional view taken along line AA.

Referring to FIG. 1, a first liquid crystal panel of the present invention comprises a pair of substrates 1 and 1a which are arranged to face each other with a predetermined space therebetween, and which are enclosed by the sealing material 2. A liquid crystal panel comprising liquid crystal 9 sealed in an effective area 5 in a gap between substrates, and an injection port 4 for injecting liquid crystal into a part of the effective area 5 in the gap between the substrates 1 and 1a.
And an outer seal 3 provided outward from both ends of the inlet 4 of the inner seal 2.
And at least one island-shaped seal 8 is provided in a liquid crystal introduction region 7 surrounded by the external seal 3 and a scribe line 6 at the end of the external seal 3.

In the present invention, the number of the island-shaped seals 8 may be one or more, and the shape thereof is not particularly limited, but the planar shape may be a circle, an ellipse, a square, or another polygon. In particular, it is preferable that the shape is a circle or an ellipse whose major axis is parallel to the outer seal. FIG. 1 shows an example in which two circular island-shaped seals 8 are provided in a liquid crystal introduction region 7.

The distance between the island-shaped seal 8 and the outer seal 3 and the distance between the island-shaped seal 8 and the island-shaped seal 8 provided in the liquid crystal introduction region 7 into which the liquid crystal is injected are at least 1 to 25.
mm, preferably 8 to 15 mm apart.

An internal seal 2 provided with the injection port 4 is provided in parallel with the side of the substrate 1, and the external seal 3 is perpendicular to the internal seal 2 from both ends of the injection port 4 toward the outside.
Is preferably formed. Further, the liquid crystal is preferably a liquid crystal exhibiting a chiral smectic phase, for example, a ferroelectric liquid crystal.

In the present invention, the width of the injection port 4 is 40 to
It is about 150 mm, and provided in the liquid crystal introduction region, by maintaining a distance of at least 1 to 25 mm between the island seal and the outer seal and the island seal and the island seal, without narrowing the injection port, In addition, even if a liquid crystal having a high viscosity is used, it is possible to sufficiently cope with the problem, and furthermore, it is possible to simultaneously suppress the expansion of the injection port during the injection and the alignment defect from the seal. Needless to say, a panel having a uniform cell gap has a good margin for driving (particularly a threshold), and is a panel that can be easily controlled.

FIG. 2 is a schematic plan view showing another example of the first liquid crystal panel of the present invention. FIG. 2 shows a liquid crystal introduction region 7.
A liquid crystal panel in which two elliptical island-shaped seals 8 whose long axis is parallel to the outer seal 3 is provided.

FIG. 3 is an explanatory view showing an example of the second liquid crystal panel of the present invention. FIG. 3A is a schematic plan view,
FIG. 3B is a schematic sectional view taken along the line BB. As shown in FIG. 3, in the second liquid crystal panel of the present invention, in the first liquid crystal panel described above, the island-shaped seal 8a is a line-shaped seal, and a part thereof is formed by the external seal 3 and the external seal 3. It is characterized in that it is provided so as to protrude outside the scribe line 6 in the liquid crystal introduction region 7 surrounded by the scribe line 6 at the tip.

By adopting such a constitution, the present invention can sufficiently cope with the use of a liquid crystal having a high viscosity without narrowing the injection port, and furthermore, the expansion of the injection port at the time of injection and the sealing. Can be suppressed at the same time. In addition, if the conventional shape as shown in FIG. 5 is used, it is difficult for the air trapped in the panel bonded during the curing of the seal to be exhausted, and as a result, the cell thickness becomes large or the pressure at the time of the exhaust becomes the most. Such a defect that the vicinity of the injection port becomes thicker occurred. However, as shown in FIG. 3, the scribe line 6 in the liquid crystal introduction region 7 where the injection port 4 is formed in order to secure the passage of the air at the time of exhaustion. Further, by providing a line-shaped seal of the island-shaped seal 8a, it is possible to improve air exhaustion and suppress the above-described defect.

In addition, a panel having a uniform cell gap has a good margin for driving (particularly, a threshold value), and is a panel which can be easily controlled. FIG. 7 is a diagram schematically showing a state of displacement of the cell gap with respect to the lower substrate.

[0025]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Two substrates were provided with electrodes for driving liquid crystal. In order to form a panel on one of the substrates with a predetermined gap between the substrates, an enclosure for sealing the liquid crystal while maintaining the gap is formed by a seal. The seal is usually drawn using a seal dispenser or the like, and a pair of seals are extended outward to form an injection port with a width of 80 mm in order to form an injection port from a part of the enclosure of the internal seal. The length of the outer seal extended outward is not specified, but
It is better to make it as long as possible, specifically, 5 to 50 mm
Is desirable. Three island-shaped seals were formed between the pair of external seals extending outward and the scribe line so that the distance between the seals was 20 mm. (See FIG. 1.) At this time, this island-shaped seal was arranged as small as possible and not to enter inside one side on the injection port side.

In this way, a seal is formed on one of the substrates,
Spacers for forming a gap are scattered on the opposite side, and a cell having a gap is produced by a bonding machine, and then put into a curing furnace to cure the seal, and the seal is cured. The substrate thus formed is cut so that the cell can be easily injected to form an injection port. Thereafter, the cell formed in this way is evacuated, a liquid crystal is applied to the injection port, and the pressure is returned to the atmospheric pressure. Infiltrate into the gap. Looking at the injection state of the liquid crystal at this time, the liquid crystal is injected while being repelled around the island-shaped seal formed between the seals forming the injection port. The repelling from this portion trails with the progress of the liquid crystal. However, since the island-shaped seal is located in the vicinity of the cut, this trailing fits without reaching the effective area. After the injection, a sealing material was applied to the injection port to form a panel.

At this time, in order to check whether the expansion of the gap of the panel was due to the influence of the sealing material, a sealing material which was left open without applying the sealing material was prepared. Further, for comparison, a case where the island-shaped seal was not formed was prepared. Looking at the cell gaps of these three panels, the inlet side was large and the opposite side was small. However, those without the island-shaped seal were twice as large as those with the seal.

When the sealing material and the width and the pressing pressure at the time of laminating and curing are determined to give specific examples, specific examples are as follows. Using Stract Bond “XN-21F” (manufactured by Mitsui Toatsu Co., Ltd.) as a seal material, drawing with a dispenser so that the seal width becomes 2 mm (width after bonding), and the diameter of the island-shaped seal is 1 mm after bonding. I drew it to be. The pressing pressure at the time of lamination and at the time of curing the seal was 100 Kpa, and the curing temperature and time were 160 ° C. and 1 hour. The diameter of the spacer was 2.0 μm. After evacuation of the cell, liquid crystal was injected and the cell gap was measured. 1) The panel with an island-shaped seal, which was sealed,
The difference between the cell gap on the inlet side and the cell gap on the opposite side is 0.10 μm. 2) For an unsealed panel with an island-shaped seal,
The difference in cell gap between the inlet side and the opposite side was 0.11 μm. 3) The difference in cell gap between the inlet side and the opposite side of the sealed panel without an island-shaped seal was 0.25 μm.

As the substrate, a glass substrate was used on the common side / segment side (thickness: 1.1 mm), and a color filter was provided on the common side with R, G, B = 1. It was formed with a thickness of 5 μm. The pattern size was one dot of 300 μm square. A black stripe was formed between the filters for light shielding. A protective film having a thickness of 2 μm is formed on the filter and the black stripe, and a step between colors of the filter is reduced by 1 μm.
It was set to be within 2,000Å. At this time, the distance between pixels is 10
μm. Further, a transparent electrode is formed to a thickness of 1000 mm on the common and segment substrates by a sputtering method, patterned by a photolithographic method, and Me (A) is used as an auxiliary electrode.
1) A required pattern was formed to a thickness of 1500 °.
On top of these, SiO ₂ is used as an insulating film by sputtering.
0 [deg.] Thickness, and a polyimide (PI) film as an alignment film is formed thereon to a thickness of 200 [deg.] By a printing method.
This was rubbed and bonded. The steps after the sealing step are as described above.

Since this panel has a uniform cell gap,
In addition, the panel was very easy to control because no alignment unevenness occurred and there was no displacement in how the voltage was applied due to the cell gap.

Example 2 In the same manner as in Example 1, a cell gap was further reduced here because a ferroelectric liquid crystal was used as the liquid crystal.
The conditions for forming the substrate were the same as in Example 1, except that only the diameter of the spacer was reduced to 1.5 μm.

The ferroelectric liquid crystal was injected into the cell thus formed and measured. 1) The difference between the cell gap on the side opposite to the injection port side of the panel having an island-shaped seal and being sealed is: 0.07 μm 2) For an unsealed panel with an island-shaped seal,
The difference in cell gap between the inlet side and the opposite side was 0.07 μm. 3) The difference in cell gap between the inlet side and the opposite side of the sealed panel without an island-shaped seal was 0.12 μm.

Since this panel has a uniform cell gap,
In addition, the panel was very easy to control because no alignment unevenness occurred and there was no displacement in how the voltage was applied due to the cell gap.

Example 3 In the same manner as in Example 1, a cell gap was further reduced in order to use a ferroelectric liquid crystal as a liquid crystal. The substrate forming conditions were the same as in Example 1, except that the shape of the island-shaped seal was changed to a short line shape (see FIG.
mm) and formed from the inside of the scribe line to near the outside of the effective area, and reduce the diameter of the spacer to 1.5 μm.
m.

The ferroelectric liquid crystal was injected into the cell thus formed and measured. 1) The difference in cell gap between the panel side having a line-shaped seal and the sealed side and the side opposite to the inlet side. Is 0.07μ
m 2) The difference in cell gap between the inlet side and the opposite side of the unsealed panel with a line-shaped seal is 0.06 μm.
m 3) The difference in cell gap between the inlet side and the opposite side of the sealed panel without a line-shaped seal is 0.15 μm.
m.

Since this panel has a uniform cell gap,
In addition, the panel was very easy to control because no alignment unevenness occurred and there was no displacement in how the voltage was applied due to the cell gap.

Example 4 Two substrates were provided with electrodes for driving liquid crystal. In order to form a panel on one of the substrates with a predetermined gap between the substrates, an enclosure for sealing the liquid crystal while maintaining the gap is formed by a seal. The seal is usually drawn using a seal dispenser or the like, and a pair of seals are vertically extended outward to form an inlet from a part of the inner seal. The length of the outer seal extended outward is not particularly limited, but should be as long as possible. Three line-shaped seals were formed between the pair of outer seals extending outward. (See FIG. 3) At this time, this line-shaped seal is arranged so as to be as small as possible and not to enter inside one side of the injection port side, and furthermore, a part of the line-shaped seal is smaller than the scribe line. It was arranged to be on the outside.

In this manner, a seal is formed on one of the substrates, spacers for forming a gap are scattered on the opposite side, and cells having gaps are produced by a bonding machine, and cured to cure the seal. Put into a furnace to cure the seal. The cell thus formed is cut into a substrate so that liquid crystal can be easily injected, and an injection hole is formed. At this time, if the number of line-shaped seals is large, it cannot be cut cleanly when scribing. According to the study by the present inventors, when the size of the injection port is set to 80 mm, the maximum number of the line-shaped seals is seven at most. That is, the interval is at least 1
Those having a size of approximately 0 mm or more and 40 mm or less are not affected by the orientation at the time of injection.

Thereafter, the cell thus formed is evacuated, a liquid crystal is applied to the injection port, and the pressure is returned to the atmospheric pressure to allow the liquid crystal to penetrate into the gap. Looking at the injection state of the liquid crystal at this time, the liquid crystal is injected while being repelled around a linear seal formed between the seals forming the injection port. The repelling from this portion is tailed with the progress of the liquid crystal. However, since the tail is located in the vicinity of the cut, the tailing does not reach the effective area and stops. (See Fig. 3)

After the liquid crystal was injected, a sealing material was applied to the injection port to form a panel. At this time, in order to check whether or not the expansion of the gap of the panel was due to the influence of the sealing material, a device which was left open without applying the sealing material was prepared. Further, for comparison, a device which does not form the linear seal was prepared. Looking at the cell gaps of these three panels, the inlet side was large and the opposite side was small. However, the one without the line-shaped seal was about twice as large as the one without the seal. Here, considering why the cell gap is improved by putting the line-shaped seal outside the scribe line, when the seal is cured, pressurization is applied so as to not lose the expansion of the air inside the cell simultaneously with heating. It's pretty depressed because it does. Then, since the inside of the seal has the spacer, the cell gap can be reduced to some extent, but the outside of the seal is crushed. Especially,
If the inlet and the outside are crushed, the air contained in the cell cannot be exhausted, resulting in a defective cell gap.

The following is a specific example in which the seal material, the width, and the pressing pressure at the time of bonding and curing are determined in order to specifically indicate by numbers. Using Struct Bond “XN-21F” (manufactured by Mitsui Toatsu Co., Ltd.) as a sealing material, drawing with a dispenser so that the sealing width becomes 2 mm (width after bonding), and the width of the linear seal is 1 mm after bonding.
I drew it to be. The pressing pressure at the time of laminating and at the time of curing the seal was 100 Kpa, and the curing temperature and time were 160 ° C. and 1 hour. The diameter of the spacer was 1.5 μm. After evacuation of the cell, liquid crystal was injected and the cell gap was measured. 1) The difference between the cell gap on the side opposite to the injection port and the cell gap on the panel having a line-shaped seal and sealed was 0.08 μm.
m 2) The difference in cell gap between the inlet side and the side opposite to the inlet side of an unsealed panel having a line-shaped seal is 0.09 μm.
m 3) The difference in cell gap between the inlet side and the opposite side of the sealed panel without a line-shaped seal is 0.23 μm.
m.

As the substrate, a glass substrate was used on the common side / segment side (1.1 mm thick), and a color filter was provided on the common side with R, G, B = 1. It was formed with a thickness of 5 μm. The pattern size was one dot of 300 μm square. A black stripe was formed between the filters for light shielding. A protective film having a thickness of 2 μm is formed on the filter and the black stripe.
It was set to be within 2,000Å. At this time, the distance between pixels is 10
μm. Further, a transparent electrode is formed on the common and segment substrates to a thickness of 1,000 mm by a sputtering method, and is patterned by a photolithographic method.
A required pattern of (Al) having a thickness of 1500 ° was formed. On these, SiO ₂ is formed as an insulating film to a thickness of 500 ° by sputtering, and a polyimide (PI) film is formed thereon as an alignment film to a thickness of 200 ° by a printing method, and rubbed thereon. And bonded together. The steps after the sealing step are as described above.

Since this panel has a uniform cell gap,
In addition, since the alignment unevenness did not occur, and there was no displacement in how the voltage was applied due to the cell gap, the panel was very easy to control.

Example 5 In the same manner as in Example 4, a cell gap was further reduced in order to use a ferroelectric liquid crystal as a liquid crystal.
The substrate formation conditions were the same as in Example 1, the number of linear seals was increased to three (see FIG. 4), and the diameter of the spacer was reduced to 1.5 μm. The line-shaped seal was disposed up to a position near the edge of the substrate.

The ferroelectric liquid crystal was injected into the cell thus formed and measured. 1) The difference between the cell gap on the side opposite to the injection port side of the panel having a line-shaped seal and being sealed is as follows. 0.06μ
m 2) The difference in cell gap between the inlet side and the side opposite to the inlet side of the unsealed panel having a line-shaped seal is 0.07 μm.
m 3) The difference in cell gap between the inlet side and the opposite side of the sealed panel without a line-shaped seal is 0.1 lμ.
m.

Since this panel has a uniform cell gap,
In addition, since the alignment unevenness did not occur, and there was no displacement in how the voltage was applied due to the cell gap, the panel was very easy to control.

[0048]

As described above, according to the present invention, it is possible to sufficiently cope with the use of a liquid crystal having a high viscosity without narrowing the injection port, and at the same time, the cell gap of the injection port during the injection of the liquid crystal. It is possible to obtain a liquid crystal panel in which the spread of alignment and alignment defects from the seal are suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a first liquid crystal panel of the present invention.

FIG. 2 is a schematic plan view showing another example of the first liquid crystal panel of the present invention.

FIG. 3 is an explanatory view showing an example of a second liquid crystal panel of the present invention.

FIG. 4 is a schematic plan view showing another example of the second liquid crystal panel of the present invention.

FIG. 5 is an explanatory diagram showing an example of a conventional liquid crystal panel.

FIG. 6 is an explanatory view showing another example of a conventional liquid crystal panel.

FIG. 7 is a view schematically showing a state of displacement of a cell gap with respect to a lower substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Substrate 2 Sealing material 3 External seal 4, 4a Injection 5 Effective area 6 Scribe line 7 Liquid crystal introduction area 8 Island seal 9 Liquid crystal

Claims (13)

[Claims] 1. A liquid crystal panel comprising: a pair of substrates disposed to face each other at a predetermined distance from each other; a pair of substrates bonded to each other with a sealing material; and a liquid crystal is sealed in an effective area in a substrate gap surrounded by the sealing material. An internal seal provided by opening an injection port for injecting liquid crystal into a part of the effective area in the substrate gap; and an external seal provided outward from both ends of the injection port of the internal seal. A liquid crystal panel comprising at least one island-shaped seal provided in a liquid crystal introduction region surrounded by the external seal and a scribe line at a tip of the external seal. 2. The liquid crystal panel according to claim 1, wherein the shape of the island-shaped seal is a circle or an ellipse whose major axis is parallel to the external seal. 3. The liquid crystal panel according to claim 1, wherein the distance between the island-shaped seal and the outer seal and between the island-shaped seal and the island-shaped seal is at least 1 to 25 mm. 4. An internal seal provided with the injection port is provided in parallel with a side of the substrate, and an external seal is formed in a direction perpendicular to the internal seal from both ends of the injection port toward the outside. 2. The liquid crystal panel according to 1. 5. The liquid crystal panel according to claim 1, wherein the liquid crystal is a liquid crystal exhibiting a chiral smectic phase. 6. The liquid crystal panel according to claim 1, wherein the island-shaped seal is provided so as to protrude outside a scribe line of a liquid crystal introduction region partially surrounded by an external seal and a scribe line at a tip of the external seal. A liquid crystal panel, comprising: 7. The liquid crystal panel according to claim 6, wherein the liquid crystal is a liquid crystal exhibiting a chiral smectic phase. 8. A method for manufacturing a liquid crystal panel in which a pair of substrates disposed to face each other with a predetermined space therebetween is bonded with a sealing material, and liquid crystal is sealed in an effective area within a substrate gap surrounded by the sealing material. An internal sealing material in which an injection port for injecting liquid crystal into a part of the effective area in the substrate gap is opened on one of the substrates; A sealing material is provided, and at least one island-shaped sealing material is provided in a liquid crystal introduction region surrounded by the external sealing material and a scribe line at a tip of the external sealing material, and then the other sealing substrate is attached. Liquid crystal panel manufacturing method. 9. The method for manufacturing a liquid crystal panel according to claim 8, wherein the shape of the island-shaped sealing material is circular or elliptical such that the major axis is parallel to the external sealing material. 10. The distance between the island-shaped seal material and the outer seal material and between the island-shaped seal material and the island-shaped seal material is at least 1 to 2
The method for manufacturing a liquid crystal panel according to claim 8, wherein the distance is 5 mm. 11. An internal seal provided with the injection port is provided in parallel with a side of the substrate, and an external seal is formed in a direction perpendicular to the internal seal from both ends of the injection port toward the outside. 9. The method for manufacturing a liquid crystal panel according to item 8. 12. The method according to claim 8, wherein the liquid crystal is a liquid crystal exhibiting a chiral smectic phase. 13. The method for manufacturing a liquid crystal panel according to claim 8, wherein the island-shaped sealing material is partially formed by an external sealing material and a scribe line in a liquid crystal introduction region surrounded by a scribe line at a tip of the external sealing material. A method for manufacturing a liquid crystal panel, comprising: sticking out a substrate after protruding outside;