JPH08160439A - Production of liquid crystal display panel - Google Patents

Abstract

PURPOSE: To expectantly improve a display grade without forming non-injected parts of liquid crystals, to shorten injection time and to improve working efficiency by preventing formating of defective parts, such as rupture, in a sealant at the time of curing the sealant and eventually well injecting the liquid crystals into a liquid crystal display panel by using a vacuum chamber. CONSTITUTION: The sealant is applied on the peripheral part of a substrate to a frame shape in such a manner that plural apertures are formed on the four sides and both substrates are stuck to each other (P4, P5) and are pressurized in the non-cured state of the sealant, by which a prescribed cell gap is obtd.; further, the assembly is put into an oven while the pressurized state is maintained to heat the substrate and to cause the normal curing of the sealant (P6). The aperture exclusive of the injection hole is sealed with a sealant after curing of the sealant (P7) and thereafter, the assembly is put into a liquid crystal injection chamber set with a liquid crystal vessel, where the liquid crystals are injected from the injection hole by utilizing a pressure difference, then the injection hole is sealed (P8 to P10).

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 panel in which liquid crystal is injected between a pair of substrates using a vacuum chamber.

[0002]

2. Description of the Related Art A liquid crystal display panel, as shown in FIG. 11, has a pair of transparent substrates 30 and 31 adhered to each other with a sealant 32 provided in a frame shape on the periphery of the facing surface. A liquid crystal (not shown) is sealed in the gap between the substrates 30 and 31.

Explaining the method of manufacturing such a liquid crystal display panel, first, a transparent electrode, an alignment film and the like (not shown) are formed on each of the substrates 30 and 31, and the alignment film is subjected to a rubbing treatment. Next, the sealant 32 is applied to one or both peripheral portions of the substrates 30 and 31 by a printing method or the like. As the sealant 32, a thermosetting resin, an ultraviolet curable resin, or the like is used.

When the application of the sealing agent 32 is completed, the substrates 30 and 31 are bonded to each other with the electrode forming surfaces facing each other through the sealing agent 32, and pressure is applied to form a predetermined cell gap (distance between the substrates). At this time, a portion excluding a part of the sealant 32 is provided, and an injection hole 33 for injecting liquid crystal is formed between the substrates 30 and 31 later. If the sealant 32 is a thermosetting resin while maintaining a predetermined cell gap, the substrates 30 and 31 are placed in an oven 34 and heated to cure the sealant 32, as shown in FIG. , The empty panel 35 is obtained. On the other hand, in the case of ultraviolet curable resin, an ultraviolet curing furnace is used.

Next, as shown in FIG. 13, the empty panel 35 is put into a liquid crystal injection chamber 36 in which a liquid crystal tank 37 containing liquid crystals 38 is set, and the chamber 36 is placed.
The inside of the empty panel 35 is decompressed by the vacuum pump 39, and the air inside the empty panel 35 is exhausted through the injection hole 33. Then, after sufficiently exhausting, the injection hole 33 is immersed in the liquid crystal tank 37 and the chamber 36 is returned to the atmospheric pressure, and the liquid crystal 38 in the liquid crystal tank 37 is removed by the pressure difference between the inside and outside of the empty panel 35. It is injected into the empty panel 35. After the injection is completed, the injection hole 33 is sealed with a sealant made of an ultraviolet curable resin or the like to complete the liquid crystal display panel.

[0006]

However, the demand for the above-mentioned conventional manufacturing method is remarkably increasing today.
In the case of manufacturing a large-sized liquid crystal display panel that exceeds the mold (diagonal 380 mm), when the liquid crystal 38 is injected by utilizing the pressure difference between the inside and outside of the empty panel 35, the vacuum inside the panel is reduced to a small panel. Therefore, the liquid crystal injection becomes incomplete. As a result, the display quality is deteriorated due to the liquid crystal non-filled portion, or the vacuum degree inside the panel is low, so that the force of pulling the liquid crystal 38 into the empty panel 35 becomes weak and the filling time is long. There is a problem.

That is, according to the conventional method, when the sealant 32 is a thermosetting resin, the substrates 30 and 31 are bonded together via the sealant 32, and then heated and sealed with a predetermined cell gap maintained. The agent 32 is hardened, and in this step, the air inside the empty panel 35 expands as the temperature rises and is exhausted from the injection hole 33 due to the rise in pressure. The injection hole 33 is actually only a few mm wide.
When manufacturing a small-sized panel, the amount of air inside the panel is small, and the distance between the side on which the injection hole 33 is not formed and the side on which the injection hole 33 is formed is short, so that air accompanying expansion is generated. Is quickly exhausted from the injection hole 33, and no special problem occurs. However, when the liquid crystal display panel becomes large,
Since the amount of air inside the panel is large and the distance between the side on which the injection hole 33 is not formed and the side on which the injection hole 33 is formed is long, air is provided on one side with expansion. Not only is it exhausted from the injection hole 33 formed, but pressure is applied to the sealing agent on the side where the injection hole 33 is not formed, and the sealing agent 32 in an uncured state is broken to be exhausted. . Therefore, it becomes difficult to continuously form the sealant 32, and a defective portion such as a breakage occurs in the sealant 32. Due to this, the pressure difference between the inside and outside of the empty panel 35 is used to cause the inside of the empty panel 35 to be damaged. When the liquid crystal 38 is injected, the vacuum inside the panel cannot be maintained, which causes the above problem. Further, this may occur when a large-sized liquid crystal display panel is manufactured because a slight temperature rise occurs when ultraviolet rays are applied even when an ultraviolet curable resin is used for the sealant 32.

In addition to this, as shown in FIG. 14, an empty panel 41 having an injection hole 33 and an exhaust hole 40 on a side opposite to the side where the injection hole 33 is formed is used.
A rotary vacuum pump 39 is connected to the exhaust hole 40 side of the empty panel 41 to evacuate the inside of the empty panel 41, and then the filling hole 33 is immersed in the liquid crystal tank 37 while continuing the evacuation. There is also a method of injecting the liquid crystal 38 into the panel 41. However, the injection hole 33 is, as described above,
Actually, the width is only a few mm, and it is very difficult to connect the vacuum pump 39 and the empty panel 41 in accordance with the width in actual use. Therefore, the present invention is premised on a manufacturing method in which a liquid crystal is injected using a vacuum chamber.

[0009]

In order to solve the above-mentioned problems, a method for manufacturing a liquid crystal display panel according to claim 1 of the present invention comprises a pair of flat plates, each of which has a frame at the peripheral portion of the facing surface. The substrates are bonded together via a sealing agent formed into a ring shape, and pressure is applied to obtain a predetermined substrate spacing, and the sealing agent is cured while maintaining the substrate spacing to form an empty panel. In a method of manufacturing a liquid crystal display panel in which a liquid crystal is injected from an opening formed by removing a part thereof, a vacuum chamber is used, and at least one opening is formed on each of at least two sides having a rectangular panel body. The above sealing agent is formed as described above, and after curing the sealing agent, the opening except the opening for injecting liquid crystal is sealed with a sealing agent to form an empty panel. It is a thing.

In order to solve the above-mentioned problems, a liquid crystal display panel manufacturing method according to a second aspect of the present invention is such that a pair of substrates each having a flat plate shape are formed in a frame shape in the peripheral portions of the facing surfaces. To form an empty panel, put this empty panel in a vacuum chamber, decompress the inside of the chamber to exhaust the air inside the empty panel, and then remove the sealant to form an opening. In the method of manufacturing a liquid crystal display panel, in which the liquid crystal is injected into the empty panel by utilizing the pressure difference between the inside and the outside of the empty panel by immersing the part in the liquid crystal and restoring the pressure inside the chamber, the empty panel is formed. At this time, the sealing agent is formed so that one or more openings are formed on at least two sides of the panel body having a quadrangular shape to form an empty panel having a plurality of openings.
When injecting the liquid crystal into the empty panel, after exhausting the air inside the empty panel, the openings except the opening for injecting the liquid crystal under a reduced pressure are sealed with a sealant, and then unsealed. The opening of the stopper is immersed in the liquid crystal.

[0011]

According to the manufacturing method of the above claim 1, before curing the sealant, one or more openings are formed on at least two sides of the panel body, and after the sealant is cured. The openings other than those used for injecting the liquid crystal are sealed with a sealant, and then the liquid crystal is injected into the empty panel using a vacuum chamber. Therefore,
When the sealing agent is cured, the air between the substrates expands as the temperature rises, and when the pressure rises, the air between the substrates becomes
The air will be quickly exhausted from the multiple openings provided on multiple sides, and even if a large-sized liquid crystal display panel is manufactured, the expanded air will break the uncured sealant as in the past. Is not exhausted,
It is possible to prevent the occurrence of defective parts such as tears in the sealant. As a result, it becomes possible to satisfactorily inject the liquid crystal into the empty panel by using the vacuum chamber, the liquid crystal uninjected portion does not occur, the display quality is improved, the injection time is shortened, and the work efficiency is improved. Can be expected.

According to a second aspect of the present invention, there is provided an empty panel having a plurality of openings by forming a sealant so that one or more openings are formed on at least two sides of the panel body. After forming this empty panel into a vacuum chamber and exhausting the air inside the empty panel, the openings except the openings (injection holes) for injecting liquid crystal under a reduced pressure are sealed with a sealant. After that, the injection hole is immersed in the liquid crystal, and the liquid crystal is injected into the empty panel by utilizing the pressure difference between the inside and outside of the empty panel. Therefore, in forming the empty panel, in addition to the effect obtained by the method of the above-mentioned 1 by curing the sealant with a plurality of openings provided, the inside of the vacuum chamber is evacuated. When the air inside the empty panel is exhausted, the air is quickly exhausted through the multiple openings, so that
Uniform exhaust can be performed without cracking the substrate or breaking the sealant. As a result, a better liquid crystal can be injected, a liquid crystal non-injected portion is less likely to occur, and display quality is improved.

[0013]

【Example】

[Embodiment 1] The following will describe one embodiment of the first aspect of the present invention with reference to FIGS. 1 to 7.

First, the structure of the liquid crystal display panel manufactured by the liquid crystal display panel manufacturing method of this embodiment will be described with reference to the sectional view of FIG.

As shown in the figure, the liquid crystal display panel is opposed to each other, and the transparent electrodes 3 made of a transparent conductive film are formed on the opposed surfaces.
3, a pair of substrates 1 and 2 made of glass or the like on which the alignment films 4 and 4 are formed. These substrates 1 and 2 are attached to each other by a sealant 5 containing a spacer provided in the peripheral portion of the facing surface, and a plurality of polystyrene-based materials for maintaining a predetermined dimension between the substrates 1 and 2 are provided between the substrates 1 and 2. A liquid crystal 6 is sandwiched together with a spacer 7 made of resin.

Next, a manufacturing process of the liquid crystal display panel, which is a manufacturing method of the liquid crystal display panel of the present embodiment, will be described with reference to FIGS.

First, a transparent conductive film is formed on each of the substrates 1 and 2 and patterned into a predetermined shape to form transparent electrodes 3 and 3 (process 1, hereinafter, the process is abbreviated as P). Next, after the alignment films 4 and 4 are formed so as to cover these transparent electrodes 3 and 3 (P2), the alignment films 4 and 4 are rubbed so that the liquid crystal 6 can be aligned (P3).

Next, as shown in FIG. 3, a sealant (shown by hatching in the figure) 5 containing a spacer is provided around the periphery of the surface of the substrate 1 on which the transparent electrode 3 is formed.
Is formed in a frame shape (P4). Then, at this time, the sealing agent 5 is partially removed and a total of 11
.., 5b ... are provided. Of these, the side-side openings 5a provided with four openings are used as injection holes to be used later for injecting the liquid crystal 6, and the other openings 5b are used as exhaust holes. The method of providing the openings is not limited to the above, and it is sufficient to form a total of two or more on at least two sides of the panel body having a quadrangular shape. Further, in the case of the present embodiment, the sealant 5 is formed on one of the substrates 1 and 2, but it may be formed on the substrate 2 side or on both substrates 1 and 2. Of course good.

Next, spacers 7 are sprinkled on the alignment film 4,
The substrate 1 with the surfaces on which the transparent electrodes 3 are formed face each other.
・ Put the two together via the sealant 5 (P5).
Then, the sealant 5 is pressed in an uncured state to obtain a predetermined cell gap (distance between substrates), and is further put in the oven 10 as shown in FIG. The sealant 5 is fully cured by heating with a heater that does not exist (P6).

At this time, the substrate 1 surrounded by the sealant 5
The air between the two expands due to the temperature rise due to the heat from the heater, but as shown by the arrow in FIG. 4, it is exhausted from the plurality of openings 5a, 5b ... The sealing agent 5 is not damaged by the expansion of air.

When the sealant 5 is completely cured, the bonded substrates 1 and 2 are taken out from the oven 13,
As shown in FIG. 7, the openings 5b, which are exhaust holes, except the openings 5a, which are injection holes, are sealed with a sealant 16 made of an ultraviolet curable resin or the like (P7). Thereby, the empty panel 11 is obtained.

Next, as shown in FIG. 6, the empty panel 11 is set in a liquid crystal injection chamber (vacuum chamber) 13 in which a liquid crystal tank 12 filled with the liquid crystal 6 is set. After that, the exhaust valve 14 is opened, and the liquid crystal injection chamber 13 is evacuated by the vacuum pump 15 to reduce the pressure,
At the same time, the air inside the empty panel 11 is exhausted (P8).

When the exhaust of the air from the empty panel 11 is completed, the side of the empty panel 11 on the side where the opening 5a is formed is immersed in the liquid crystal 6 in the liquid crystal tank 12, and the intake valve 17
Is opened to return the inside of the liquid crystal injection chamber 13 to the atmospheric pressure, and the liquid crystal 6 is injected by utilizing the fact that the pressure inside the empty panel 11 is lower than the pressure around the empty panel 11 (P
9).

When the injection of the liquid crystal 6 is completed, the empty panel 11 in which the liquid crystal 6 is injected is taken out from the liquid crystal injection chamber 13, the liquid crystal 6 adhering to the openings 5a ... The openings 5a, which are injection holes, are filled and sealed (P10). In this way, the liquid crystal display panel is completed.

As described above, in the method of manufacturing the liquid crystal display panel of this embodiment, one or more openings are formed on at least two sides of the rectangular panel body before the sealant 5 is cured. After the sealant 5 is cured, the openings 5b ... Other than the openings 5a used for injecting the liquid crystal 6 are sealed with the sealant 16, and then the liquid crystal injection chamber 1
3 is used to inject liquid crystal into the empty panel 11. Therefore, by heating using the oven 10,
When the sealant 5 is hardened, the air between the substrates 1 and 2 expands as the temperature rises, and when the pressure rises, the substrate 1
The air between the two has a plurality of openings 5a provided on a plurality of sides.
.., 5b .. will be quickly exhausted. Therefore, even if the substrates 1 and 2 have a large size of more than 15 inches, there is no possibility that a defective portion such as a breakage of the sealant occurs unlike the conventional case, and the empty panel is formed by using the liquid crystal injection chamber 13. The liquid crystal 6 can be satisfactorily injected into the inside 11. As a result, in the liquid crystal display panel manufactured as described above, the display quality is less likely to be deteriorated due to the liquid crystal non-filled portion, the display quality is improved, the injection time is shortened, and the work efficiency can be expected to be improved.

In this embodiment, the sealing agent 5 made of thermosetting resin was used and the oven 10 was used to cure the sealing agent 5. However, the sealing agent made of ultraviolet curing resin was used.
Even when the sealant is cured by irradiating with ultraviolet rays, the same effect as above can be obtained.

[Embodiment 2] An embodiment according to claim 2 of the present invention will be described below with reference to FIGS. 2 and 7 to 10. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The liquid crystal display panel manufactured by the method for manufacturing a liquid crystal display panel of this embodiment has the structure shown in FIG. 2 as in the case of the first embodiment.

By the way, in the first embodiment, among the plurality of openings 5a ... 5b ..., the openings 5b ... Which are exhaust holes not used for injecting the liquid crystal are liquid crystal injection chambers 13 after the sealant 5 is cured. Before being placed inside, it is sealed with a sealant 16. However, for example, in the depressurizing step of evacuating the air in the empty panel 11 of P8, the pressure in the liquid crystal injection chamber 13 rapidly decreases, whereas the air in the empty panel 11 is an opening that is an injection hole. Only the gas is exhausted from the parts 5a ... As a result, the liquid crystal injection chamber 1
The pressure inside the empty panel 11 becomes higher than the pressure inside 3, and the pressure difference causes the substrates 1 and 2 of the empty panel 11 to rupture, or the sealing agent 5 foams from the inside and the sealing agent 5 breaks. Such a phenomenon may occur. These phenomena are particularly remarkable when manufacturing a large-sized liquid crystal display panel. It should be noted that such a problem can be solved by, for example, gradually evacuation of the inside of the liquid crystal injection chamber 13 to reduce the pressure difference between the inside of the empty panel 11 and the peripheral portion. However, in this method, the time required for decompression takes a long time, so that the number of panels that can be processed per unit time is reduced, which causes another problem that productivity is deteriorated.

Therefore, in this embodiment, as shown in FIG. 9, a plurality of openings 5a ... Are placed in the liquid crystal injection chamber 18 in a state where the openings 5b ... Are not sealed with the sealant 16.
The exhaust in the empty panel of process 8 shown in FIG. 8 is performed in the state of having 5b ...

That is, first, P in the process chart shown in FIG.
Steps 1 to P6 are performed in the same manner as in the above embodiment. P mentioned above
Through steps 1 to P6, an empty panel having a plurality of openings over different sides of the four sides of the liquid crystal display panel having a rectangular shape is obtained.

Next, as shown in FIG. 9, a liquid crystal injection chamber 1 in which a liquid crystal tank 12 filled with liquid crystal 6 is installed.
The empty panel 21 described above is set in the inside 8. As shown in FIG. 10, the liquid crystal injection chamber 18 has X.
It has a dispenser 19 which is movable in the Y and Z directions, and this dispenser 19 has ultraviolet irradiation means 20.
Are attached together.

When the setting of the empty panel 21 is completed, the exhaust valve 14 is opened, the inside of the liquid crystal injection chamber 18 is evacuated by the vacuum pump 15 to reduce the pressure, and the air inside the empty panel 21 is exhausted (P7).

At this time, since many openings 5a ... 5b ... Are provided on each side of the empty panel 21, as shown by the arrows in FIG. 9, these many openings 5a ... 5b ...
Exhausted from. Therefore, the inside of the sealing agent 5 is prevented from being foamed and the sealing agent 5 is not damaged,
Moreover, uniform exhaust is completed in a short time.

When the exhaust of the empty panel 21 is completed, the sealant 16 made of an ultraviolet curable resin or the like is filled from the dispenser 19 into the openings 5b ... , UV irradiation means 20 in sequence
More ultraviolet rays are irradiated to cure the sealant 16 and seal the openings 5b ... (P8).

After that, the liquid crystal 6 is injected into the empty panel 21 (P9), the sealant 16 is filled in the openings 5a ... Which are injection holes and sealed (P10), and the liquid crystal display panel is completed.

By manufacturing the liquid crystal display panel by such a method, the time required for depressurizing the liquid crystal injecting chamber 18 does not take a long time and the number of panels that can be processed per unit time is not lowered. With respect to productivity, uniform exhaust can be performed without causing breakage of the substrates 1 and 2 and breakage of the sealant 5 during exhaust. As a result, the liquid crystal non-filled portion is further unlikely to occur, and the display quality can be further improved.

In the liquid crystal injection chamber 18 of this embodiment, the ultraviolet irradiating means 20 is provided integrally with the dispenser 19 and the sealant 16 is filled and cured. However, the ultraviolet irradiating means is provided on the entire surface of the empty panel 21. It is also conceivable that it is provided so that it can be irradiated with ultraviolet rays, and is cured at once after the sealing agent 16 has been filled.

[0039]

As described above, in the method of manufacturing a liquid crystal display panel according to the first aspect of the present invention, one or more openings are formed on at least two sides of the panel body having a quadrangular shape. After forming the above-mentioned sealing agent on and curing the sealing agent, the openings except the openings for injecting the liquid crystal are sealed with a sealing agent to form an empty panel.

As a result, even if a large-sized liquid crystal display panel is manufactured, there is no possibility of breaking the uncured sealing agent and causing defective portions such as tearing in the sealing agent as in the conventional case. As a result, it becomes possible to satisfactorily inject the liquid crystal into the empty panel using the vacuum chamber, the liquid crystal uninjected portion does not occur, and the display quality is improved,
The injection time is shortened, and work efficiency can be improved.

In the method for manufacturing a liquid crystal display panel according to claim 2 of the present invention, as described above, when forming an empty panel, one or more openings are formed on at least two sides of the panel body having a quadrangular shape. Is formed to form a vacant panel having a plurality of openings so that the liquid crystal is injected into the vacant panel, the air inside the vacant panel is exhausted, and then the liquid crystal is depressurized. The openings other than the openings for injecting are sealed with a sealant, and then the unsealed openings are immersed in the liquid crystal.

As a result, in addition to the effect obtained by the method of claim 1, the inside of the vacuum chamber is evacuated,
When the air in the empty panel is exhausted, the air is exhausted from the plurality of openings, and uniform exhaust can be performed in a short time without rupturing the substrate or breaking the sealant. As a result, better liquid crystal injection is possible, and it is more difficult to generate a liquid crystal non-injected portion, and it is possible to further improve the display quality.

[Brief description of drawings]

FIG. 1 is a process drawing showing an embodiment of the invention of claim 1 and showing a method for manufacturing a liquid crystal display panel.

FIG. 2 is a cross-sectional view of a liquid crystal display panel manufactured through the steps shown in FIG.

FIG. 3 is an explanatory diagram showing a process of P4 in the process diagram shown in FIG.

FIG. 4 is an explanatory diagram showing a process of P6 in the process diagram shown in FIG.

FIG. 5 is an explanatory diagram showing a process of P7 in the process drawing shown in FIG.

FIG. 6 is an explanatory diagram showing a process of P8 in the process drawing shown in FIG. 1.

FIG. 7 is an explanatory diagram showing a process of P9 in the process drawing shown in FIG.

FIG. 8 is a process drawing showing an embodiment of the invention of claim 2 and showing a method of manufacturing a liquid crystal display panel.

9 is an explanatory diagram showing a process of P8 in the process diagram shown in FIG.

10 is a partial cross-sectional perspective view of a liquid crystal injection chamber used in a process of P8 in the process drawing shown in FIG.

FIG. 11 is a plan view of a conventional liquid crystal display panel.

FIG. 12 is an explanatory diagram showing a step of curing a sealant in a conventional manufacturing process of a liquid crystal display panel.

FIG. 13 is an explanatory view showing a step of injecting liquid crystal into the panel in a conventional manufacturing process of the liquid crystal display panel, showing a state in which air inside the panel is exhausted.

FIG. 14 is an explanatory view showing a step of injecting liquid crystal into the panel in another conventional manufacturing process of a liquid crystal display panel, in which liquid crystal is injected into the panel through the injection hole while exhausting through the exhaust hole. It shows the state.

[Explanation of symbols]

 1 Substrate 2 Substrate 5 Sealant 5a Opening (injection hole) 5b Opening 6 Liquid crystal 7 Spacer 10 Oven 11 Empty panel 12 Liquid crystal tank 13 Liquid crystal injecting chamber (vacuum chamber) 15 Vacuum pump 18 Liquid crystal injecting chamber (vacuum chamber) 19 Dispenser 20 UV irradiation means 21 Empty panel

Claims (2)

[Claims] 1. A pair of substrates each having a flat plate shape are attached to each other through a sealant formed in a frame shape on the peripheral portion of the facing surface and are pressed to have a predetermined substrate gap, and the substrate gap is maintained. In a method for manufacturing a liquid crystal display panel, a sealant is cured to form an empty panel, and liquid crystal is injected into the empty panel from an opening formed by partially removing the sealant using a vacuum chamber. 1 on each side of at least two sides of the main body
After forming the above sealing agent so that at least one opening is formed and curing the sealing agent, the openings other than the openings for injecting liquid crystal are sealed with a sealing agent to form an empty panel. A method of manufacturing a liquid crystal display panel, comprising: 2. A vacant panel is formed by bonding a pair of flat plates to each other with a frame-shaped sealant on the peripheral portion of the facing surface, and the vacant panel is placed in a vacuum chamber. The air inside the empty panel is exhausted by depressurizing the inside of the empty panel, and then the opening formed by partially removing the sealant is immersed in the liquid crystal, and the pressure inside the chamber is restored, and the inside of the empty panel is In a method of manufacturing a liquid crystal display panel in which liquid crystal is injected into an empty panel by utilizing a pressure difference, when forming the empty panel, one or more openings are formed on at least two sides of the panel body having a rectangular shape. As described above, when the empty panel having a plurality of openings is formed by forming the sealing agent and the liquid crystal is injected into the empty panel, the air inside the empty panel is exhausted and then the liquid crystal is injected under reduced pressure. Do A method for manufacturing a liquid crystal display panel, characterized in that openings other than the openings are sealed with a sealant, and then the unsealed openings are immersed in liquid crystal.