JPH1020317A - Method for injecting liquid crystal and device for injecting liquid crystal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the method and device in such a manner that liquid crystal injection is executed by relatively small pressure change control while sufficient deaeration is effected by immersing a liquid crystal injection hole communicating with a fine gap into a liquid crystal pool and setting the air pressure acting on the liquid crystal pool higher than the air pressure acting on the discharge hole side communicating the fine gap, thereby sucking the liquid crystals of the liquid crystal pool into the fine gap by the pressure difference therebetween. SOLUTION: A liquid crystal vessel 12 is installed in a first chamber 11 having an air suction system 13 consisting of a supercharger and a valve and a discharge system 14 consisting of a discharge path and a valve. A display 17 before the injection of the liquid crystals to be injected with the liquid crystals 16 has the injection hole 18 and the discharge hole 19 and its hermeticity is maintained by a packing 11a. This display is so mounted that the injection hole 18 is immersed into the liquid crystal pool 12 in the first chamber and that the discharge hole 19 exists on the outer side of the chamber 11. The discharge hole 13 is activated to raise the internal pressure of the chamber 13, by which the liquid crystals 16 are admitted into the display 17 before the injection of the liquid crystals of the lower pressure. The injection of the liquid crystals is thus completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD) in which a liquid crystal is injected into a liquid crystal display having a pair of electrode substrates bonded to each other.
The present invention relates to a method and an apparatus for injecting liquid crystal to be completed as display).

[0002]

2. Description of the Related Art In recent years, LCDs have been put to practical use in the fields of OA equipment, AV equipment, and the like due to advantages such as small size, thinness, and low power consumption. The LCD has a structure in which a liquid crystal is sealed in a gap formed by bonding a pair of electrode substrates, at least one of which is transparent, with its peripheral edge sealed. The electrodes formed on both substrates constitute a capacitor using liquid crystal as a dielectric layer at the opposing portions. By applying a desired voltage to the liquid crystal capacitor, an electro-optical response of the liquid crystal is promoted, and a desired display can be performed by controlling the light transmittance of each capacitor.

In particular, by arranging the electrode lines vertically and horizontally on both substrates, a simple matrix type in which liquid crystal capacitors, which are pixels, are arranged in a matrix at each intersection, and further, each pixel is configured as a capacitor sandwiching liquid crystal. Each of the capacitors has a thin film transistor (TF) as a switching element.
An active matrix type in which a thin film transistor (T: thin film transistor) is connected and arranged can control desired brightness (black and white) for each pixel to form a desired display image such as a character, a figure, or a real image. , Televisions and the like are used in extremely many fields as display devices.

An LCD is manufactured by bonding a pair of transparent electrode substrates manufactured using LSI technology with a predetermined gap, injecting a liquid crystal into an inner gap, and sealing. Such a liquid crystal injection method is disclosed in
No. 49853 discloses a vacuum injection method, that is, the liquid crystal injection hole is immersed in the liquid crystal in a vacuum state, and then returned to a normal pressure, thereby utilizing the pressure difference between the liquid crystal surface and the inside of the injection hole. There is a method of flowing into the inside. In the vacuum injection method, a chamber equipped with an exhaust system and an intake system, a liquid crystal storage container installed in the chamber, and a support portion for supporting a liquid crystal pre-injection display device on which electrode formation and bonding have been completed are provided above the liquid crystal storage container. This is realized by a liquid crystal injection device configured. The display before liquid crystal injection is fixed by an adhesive at the periphery of the electrode substrate, but an injection hole is secured by providing a cutout portion of the adhesive at one place. Further, the support portion is configured to be movable up and down. In the liquid crystal injection, first, the display before liquid crystal injection is set on the support portion, and then the air is evacuated to a vacuum or a reduced pressure state close to the vacuum. Then, the support unit is operated to lower the indicator before liquid crystal injection into the liquid crystal storage container, so that the injection hole is immersed in the liquid crystal. Then, by gradually returning the inside of the chamber to the normal pressure state, the pressure applied to the liquid crystal surface in the liquid crystal storage container is increased, and the liquid crystal is caused to flow into the display device before liquid crystal injection which is sufficiently reduced. The injection is completed.

[0005]

Although the vacuum injection method is one of the most effective liquid crystal injection methods at present, it has a problem in terms of manufacturing cost that the throughput is low and the vacuum injection apparatus is large and expensive. There is a problem in terms of reliability that degassing in the liquid crystal display device is incomplete and remains in the liquid crystal in the form of bubbles. In particular, regarding the point that the throughput is poor, it takes 1 to 3 hours to evacuate and create a vacuum state, and then return to the normal atmospheric pressure state and suck the liquid crystal in the liquid crystal reservoir into the display before liquid crystal injection. Takes 1 to 5 hours. Therefore, one injection requires 4 to 10 hours depending on the size of the panel, and the throughput is extremely poor. In order to increase the throughput, it is necessary to enlarge the chamber and process a large amount of substrates at one time. However, since a large high pressure chamber, an exhaust system, an intake system, and the like are required, an apparatus is required. Cost was high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and is in a state before completion of a liquid crystal display device in which liquid crystal is sealed in a gap between a pair of electrode substrates. In a liquid crystal injection method of injecting liquid crystal into a liquid crystal pre-injection display in which an electrode substrate is attached with a gap in which liquid crystal is loaded, the liquid crystal pre-injection display has an injection hole and an exhaust hole leading to an internal slit. The injection hole is immersed in a liquid crystal reservoir, and the pressure applied to the liquid crystal reservoir is set to be larger than the pressure applied to the exhaust hole. And the air in the slit inside the liquid crystal pre-injection indicator is exhausted from the exhaust hole.

[0007] By increasing the pressure on the liquid crystal reservoir and decreasing the pressure on the inside of the display before liquid crystal injection to cause a difference,
The liquid crystal in the liquid crystal reservoir flows into the display before liquid crystal injection from the injection hole, and at the same time, the gas inside the display before liquid crystal injection is exhausted from the exhaust hole. Good liquid crystal injection can be performed without causing a problem such as generation of liquid crystal.

In particular, the pressure in the space surrounding the liquid crystal reservoir is increased. By increasing the pressure applied to the liquid crystal reservoir, the liquid crystal in the liquid crystal reservoir flows into the display before liquid crystal injection, which is less pressurized, and the liquid crystal is injected. In particular, the pressure is reduced in a space that includes the exhaust hole and is continuously and spatially sealed from the inside of the display before liquid crystal injection.

By lowering the pressure inside the display before liquid crystal injection, the liquid crystal in the liquid crystal reservoir with a higher pressure flows into the display before liquid crystal injection, and the liquid crystal is injected. Further, in a state before completion of a liquid crystal display device in which liquid crystal is sealed in a gap between the pair of electrode substrates, the pair of electrode substrates is
In a liquid crystal injection device which is bonded with a slit into which liquid crystal is loaded, and injects liquid crystal into a display before injection of liquid crystal having an injection hole and an exhaust hole leading to the slit, a liquid crystal storage container storing the liquid crystal, A first chamber in which the liquid crystal storage container having the holes is sealed; and a second chamber spatially continuous from the inside of the display before injecting the liquid crystal while sealing at least the exhaust hole. The pressure in the first chamber is higher than the pressure in the second chamber, and the difference between these pressures causes the liquid crystal in the liquid crystal storage container to pass through the injection hole into the gap inside the display before liquid crystal injection. And the air in the narrow space inside the display before liquid crystal injection is discharged from the exhaust hole.

By increasing the pressure applied to the liquid crystal storage container and reducing the pressure applied to the inside of the display before liquid crystal injection to cause a difference, the liquid crystal in the liquid crystal storage container is supplied from the injection hole to the display before liquid crystal injection. Since the gas flows into the inside and at the same time, the gas inside the display before liquid crystal injection is exhausted from the exhaust hole, without causing the problem that the gas remains inside the liquid crystal display and bubbles are generated,
Good liquid crystal injection is performed.

In particular, the second chamber has a structure in which the indicator before liquid crystal injection, the liquid crystal reservoir, and the first chamber are sealed inside. By increasing the pressure applied to the liquid crystal reservoir, the liquid crystal in the liquid crystal reservoir flows into the display before liquid crystal injection, which is less pressurized, and the liquid crystal is injected.
In particular, the first chamber is configured to increase the air pressure by supercharging.

By increasing the pressure applied to the liquid crystal storage container,
The liquid crystal in the liquid crystal storage container flows into the display before liquid crystal injection, which is less pressurized, and the liquid crystal is injected. In particular, the pressure in the second chamber is reduced by the exhaust. By lowering the pressure inside the display before liquid crystal injection,
The liquid crystal in the liquid crystal storage container, which has a higher pressure, flows into the display before liquid crystal injection, and the liquid crystal is injected.

[0013]

1 and 2 are a side view and a front view, respectively, of a liquid crystal injection device for realizing a liquid crystal injection method according to a first embodiment of the present invention. In the second chamber (10), an intake system (1) comprising a supercharger and a valve is provided.
3) and a first chamber (11) provided with an exhaust system (14) including an exhaust path and a valve. In the first chamber (11), a liquid crystal reservoir (12) further containing a liquid crystal (16) is provided. The first chamber (11) has a liquid crystal pre-injection indicator (1) into which liquid crystal is injected.
Close to 7), a packing (11a) for supporting and fixing the display before liquid crystal injection (17) so as to extend inside and outside the first chamber (11) is provided. As will be described in detail later, the liquid crystal injecting indicator (17) is provided with an injection hole (18) and an exhaust hole (19) which lead to an internal slit into which the liquid crystal (16) is injected. The (18) is supported and fixed by the packing (11a) inside the first chamber (11) with the exhaust hole (19) outside. The second chamber (10) is provided with a support (15) that supports the indicator (17) before liquid crystal injection and is movable up and down above the liquid crystal storage container (12). The container (17) is attached to and detached from the packing (11a).

The first chamber (11) is a pressure-resistant chamber made of stainless steel or acrylic, and has a packing (1).
1a) has elasticity to the extent that the liquid crystal display device made of glass, such as Teflon resin, is not damaged, and the first chamber (1)
It is made of a material that is strong enough to withstand the pressure difference between the inside and outside of 1) and is smooth enough to ensure airtightness. In addition, the support part (15) is provided with a display before liquid crystal injection (1).
7) The contact area to the rubber is made of rubber and does not damage the liquid crystal display.
It is fixed elastically so as to be sandwiched.

As shown in FIGS. 3 and 4, the pre-liquid crystal injection indicator (17) applied to the present invention is used to form a predetermined electrode on a substrate such as glass and to control the initial alignment of the liquid crystal. A pair of electrode substrates (5
0, 51) are fixed at the peripheral edge thereof with an adhesive (52) made of a well-known epoxy resin, and are bonded together by securing a gap into which liquid crystal is injected by a spacer.
The adhesive (52) has cutouts at two locations, one of which is an injection hole (53) and the other is an exhaust hole (54).

The indicator (17) before liquid crystal injection is a packing (1).
1a), the injection hole (18) is inside the first chamber (11), the exhaust hole (19) is outside, and the injection hole (18) is connected to the liquid crystal ( 1
6) It is supported and fixed so as to be sufficiently immersed in it. FIG.
In FIG. 3, the display before liquid crystal injection (17) has the structure shown in FIG. 3, but the display having the structure shown in FIG.
The liquid crystal container (1) is mounted with the injection hole (18) inside and the exhaust hole (19) outside.
The configuration is such that it is sufficiently immersed in the liquid crystal (16) of 2).

In this state, the intake system (13) is operated,
The supercharging of the first chamber (11) is performed. This allows
The internal pressure of the first chamber (11) is increased and the liquid crystal reservoir (1) is increased.
By pressurizing the liquid crystal (16) surface of (2), the liquid crystal is sucked up from the injection hole (18) into a narrow gap inside the liquid crystal pre-injection display (17) having a lower pressure and flows therein. At the same time, the gas inside the liquid crystal display indicator (17) is exhausted from the exhaust hole (19), and the inside of the liquid crystal display device is completely degassed. You.

Thereafter, the atmosphere is exhausted from the exhaust system (14) and returned to the normal pressure state.
7) and the same processing is repeated. The liquid crystal display device into which the liquid crystal is injected is completed as a liquid crystal display device by sealing the injection hole (18) and the exhaust hole (19) with a known UV resin or the like. Note that, in the present embodiment, the second chamber (10) does not need to have a chamber shape,
Further, together with the support portion (15) for supporting and fixing the display (17) before liquid crystal injection, it is not an indispensable component, but may be in another form or may be unnecessary.

In the liquid crystal injection according to the present method and the present apparatus, although supercharging for liquid crystal injection requires some time, exhaustion after injection or for preparation before injection for the next process is performed in an extremely short time. Will be Therefore, unlike the vacuum injection, a long time is not required for decompression and return pressure, and the throughput is very high. Further, the first chamber (11) may have a size that only includes and seals a part of the indicator (17) before liquid crystal injection, and the indicator (17) before liquid crystal injection as in vacuum injection. A chamber sized to include all of the above is unnecessary. Therefore, since the apparatus itself is miniaturized and inexpensive, and the first chamber (11) for supplying and exhausting air is small, the time required for supplying and exhausting air is further reduced, and one process can be performed with a 3-inch panel. A processing capacity of about 5 minutes is realized.

FIG. 5 shows the relationship between the supercharging time, the pressure in the first chamber, and the amount of liquid crystal injection for suitably implementing the liquid crystal injection according to the first embodiment of the present invention. The horizontal axis in the figure is the supercharging time (min), and the left vertical axis is the chamber pressure (mH).
g), the vertical axis on the right is the liquid crystal injection amount (%). From the figure, it can be seen that the liquid crystal is injected at a substantially constant rate by increasing the supercharging rate, that is, the slope of the pressure curve at the beginning and increasing the slope later. That is, while the liquid crystal injection amount is small, the liquid crystal is extremely easily injected even by a slight pressurization, and it is necessary to increase the pressure as the liquid crystal injection amount increases. Further, if the injection speed of the liquid crystal is too high, the alignment treatment on the surface of the electrode substrate is likely to be broken by the liquid crystal flow, and in particular, the alignment abnormality tends to occur near the injection hole (18). If the liquid crystal injection speed is too high, over-injection occurs due to the force of the liquid crystal flowing into the gap inside the display (17) before liquid crystal injection, and the cell gap of the liquid crystal display device changes. . Therefore, by suppressing the initial supercharging rate low, while preventing the orientation abnormality, or the problem of cell gap change, while increasing the supercharging rate, while maintaining a constant liquid crystal inflow speed, and, Sufficient degassing is performed, and good liquid crystal injection can be realized.

In the embodiment shown in FIG. 5, the time required for injecting the liquid crystal is 5 minutes. This is a rough processing time for preventing the problem of the abnormal alignment and the change of the cell gap. If the problem were solved in other ways, it would be possible to achieve even higher throughput based on the principles of the present invention described above. Further, according to the liquid crystal injection method of the present invention, while the liquid crystal is being injected due to the pressure difference between the pressure applied to the liquid crystal reservoir and the internal pressure of the display before the liquid crystal injection, the exhaust inside the display before liquid crystal injection (17) is simultaneously performed. Is what you do. Therefore, unlike the vacuum injection method in which the inside of the injection part is evacuated by first setting the vacuum state or a very low pressure reduction state close to the vacuum state, a large pressure change from the normal pressure is not required. That is, the internal pressure of the first chamber (11) is slightly higher than the normal pressure, and the pressurization of the liquid crystal surface of the liquid crystal reservoir always depends on the internal pressure of the display before liquid crystal injection and the gravity applied to the injected liquid crystal itself. Only supercharging is controlled to be slightly greater than the sum, and does not require much pressure. For the embodiment in which the injection conditions are shown in FIG.
The maximum pressure is about 1000 mHg. Therefore, the pressure resistance, airtightness, etc. of the chamber (11) required as required in the vacuum injection method are not required, and the apparatus cost is low.
The time required for pressure change such as exhaust and intake is also reduced.

FIGS. 6 and 7 are a conceptual side view and a conceptual front view, respectively, of a liquid crystal injection device for realizing a liquid crystal injection method according to a second embodiment of the present invention. As in the first embodiment, liquid crystal (26) is placed in a second chamber (20) provided with an exhaust system (23) composed of a pump and a valve and an intake system (24) composed of an intake path and a valve. The filled liquid crystal container (22) is installed, and the display (2)
A first chamber (2) provided with a packing (21a) for supporting and fixing the indicator before liquid crystal injection (27) inside and outside the first chamber (21) in close contact with 7);
1) is installed. The indicator before liquid crystal injection (27)
As in the first embodiment, the structure shown in FIG. 3 or FIG.
An injection hole (28) and an exhaust hole (29) are provided.
The indicator (27) before liquid crystal injection is fixed to a vertically movable support portion (25), and is attached to and detached from a packing (21a) provided in the first chamber (21). (28) is mounted so that it is sufficiently immersed in the liquid crystal (26) in the liquid crystal reservoir (22), and the exhaust hole (29) is outside the first chamber (21).

In this state, the exhaust system (23) is operated,
The second chamber (20) is evacuated to a reduced pressure. As a result, the pressure applied to the narrow space inside the display (27) before liquid crystal injection spatially continuous with the first chamber (20) is reduced, and the internal pressure of the first chamber (21) is relatively increased. The pressure on the liquid crystal (26) surface of the liquid crystal reservoir (22) is increased. Therefore, the liquid crystal (26) is filled with the injection hole (28).
Liquid crystal pre-injection indicator with lower pressure (27)
It is sucked up by the internal slit and flows in. At the same time,
The gas inside the indicator (27) before liquid crystal injection is exhausted (29)
The liquid crystal is completely discharged, and the inside of the liquid crystal display device is completely degassed, and the injection of liquid crystal is completed.

Thereafter, the atmosphere is introduced from the intake system (24), and is returned to the normal pressure state.
7) and the same processing is repeated. And
As in the first embodiment, the injection hole (28) and the exhaust hole (2
9) is sealed with a UV resin or the like to complete a liquid crystal display device. In the present embodiment, the second chamber (20) is a closed chamber like the first chamber (21), and requires sufficient pressure resistance and airtightness.

The present embodiment has a configuration similar to that of vacuum injection, and includes an exhaust system for reducing pressure in a closed chamber containing a liquid crystal reservoir and a display before liquid crystal injection. However, as described above, in the present invention, the pressure on the liquid crystal in the liquid crystal reservoir is merely made larger than the sum of the internal pressure of the display before liquid crystal injection and the gravitational force applied to the injected liquid crystal.
A reduced pressure close to that is not required. That is, the second chamber (20) does not require pressure resistance and airtightness required for vacuum injection, and the cost of the apparatus is low.
In addition, the degree of pressure reduction of the second chamber (20), that is, the exhaust amount is not so large, and it does not take a long time for the pressure reduction and the return pressure. About 5 minutes are realized.

FIG. 8 shows the relationship between the evacuation time, the pressure in the chamber, and the amount of liquid crystal injection for suitably implementing the liquid crystal injection according to the second embodiment of the present invention. The horizontal axis in the figure is
Exhaust time (minutes), the left vertical axis is the pressure (mH
g), the vertical axis on the right is the liquid crystal injection amount (%). From the figure, it can be seen that the liquid crystal is injected at a substantially constant rate by decreasing the evacuation rate, that is, increasing the slope of the pressure curve at the beginning and increasing it later. That is, while the liquid crystal injection amount is small, the liquid crystal is extremely easily injected even by a slight pressure reduction, and it is necessary to increase the pressure reduction as the liquid crystal injection amount increases. On the other hand, if the injection speed of the liquid crystal is too high, the alignment treatment on the surface of the electrode substrate is likely to be broken by the liquid crystal flow, and in particular, the alignment abnormality is likely to occur near the injection hole (28). Therefore, by suppressing the initial evacuation rate to prevent the problem of abnormal alignment, while increasing the evacuation rate later, while maintaining a constant liquid crystal inflow speed, sufficient deaeration is performed, Good liquid crystal injection can be realized.

As described above, according to the liquid crystal injection method of the present embodiment, the pressure on the liquid crystal surface of the liquid crystal reservoir is relatively increased by lowering the internal pressure of the display before liquid crystal injection, and the difference between these pressures is increased. Thus, the liquid crystal in the liquid crystal reservoir is introduced into the display before liquid crystal injection. At the same time, since the inside of the display before liquid crystal injection is also evacuated, the pressure in the second chamber may be reduced so that the pressure applied to the liquid crystal reservoir is always larger than the internal pressure of the display before liquid crystal injection. There is no need for a vacuum or a reduced pressure state close to a vacuum as in the case of vacuum injection. Therefore, the time required for the exhaust is short, and as shown in FIG. 8, an injection time of about 5 minutes can be obtained with a 3-inch panel, and the ultimate pressure at that time is 450 mHg.
It is relatively high.

FIGS. 9 and 10 are a conceptual side view and a schematic front view, respectively, of a liquid crystal injection device which realizes a liquid crystal injection method according to a third embodiment of the present invention. As in the second embodiment, the second embodiment (30) provided with an exhaust system (33) composed of a pump and a valve and an intake system (34) composed of an intake path and a valve is provided in the second chamber (30). Similarly, a first chamber (3) provided with an intake system (35) composed of a supercharger and a valve and an exhaust system (36) composed of an exhaust path and a valve.
1) is installed. As in the first and second embodiments, a liquid crystal storage container (32) containing a liquid crystal (38) in a first chamber (31) and a display (3) before liquid crystal injection.
A packing (31a) for supporting and fixing 9) is provided, and a vertically movable support portion (37) for holding a display before liquid crystal injection (39) is provided in the second chamber (30). I have. The indicator before liquid crystal injection (39) has the structure shown in FIG. 3 or FIG. 4 and has an injection hole (40) and an exhaust hole (41), like the first and second embodiments. ) Is immersed in the liquid crystal (38) in the liquid crystal storage container (32), and is mounted with the exhaust hole (41) outside the first chamber (31).

In this state, the exhaust system (33) and the intake system (35) are operated to reduce the pressure in the second chamber (30) and increase the pressure in the first chamber (31). As a result, the pressure applied to the narrow space inside the display (39) before liquid crystal injection that is spatially continuous with the first chamber (30) is reduced, and the internal pressure of the first chamber (31) is increased.
The pressure on the liquid crystal (38) surface of the liquid crystal reservoir (32) increases. For this reason, the liquid crystal (38) is sucked up from the injection hole (40) into a narrow gap inside the liquid crystal pre-injection indicator (39) having a lower pressure, and flows therein. At the same time, the gas inside the liquid crystal display indicator (39) is exhausted from the exhaust hole (41), and the inside of the liquid crystal display device is completely degassed. You.

Thereafter, the air is introduced from the intake system (34), and the air is discharged from the exhaust system (36).
The first chamber (31) and the second chamber (30) are returned to normal pressure. Then, the display is replaced with the next indicator before liquid crystal injection (39), and the same processing is repeated. Finally, as in the first and second embodiments, the injection hole (40) and the exhaust hole (41) are sealed with a UV resin or the like, thereby completing the liquid crystal display device.

As described above, according to the present embodiment, the internal pressure of the display (39) before liquid crystal injection is reduced and the pressure applied to the liquid crystal reservoir is increased. This is to be introduced into the display before liquid crystal injection. For this reason, the pressure increase in the second chamber (31) and the pressure decrease in the first chamber (30) can be smaller than those in the first and second embodiments, respectively. Accordingly, the pressure resistance and airtightness of the first chamber (31) require the same performance as that of the first embodiment, but the pressure resistance and airtightness of the second chamber (30) are the same as those of the second embodiment. Even lower ones can be used. Further, since the supercharging amount and the exhaust amount are reduced, the required performance of the intake system and the exhaust system (33, 34, 35, 36) is further reduced. Therefore, the life of the device is extended, and the cost of the device is reduced. Further, since the amount of supercharging in the first chamber (31) and the amount of exhaust in the second chamber (30) are small, the time required for the return pressure after liquid crystal injection is further reduced, so that the highest throughput is achieved. can get.

FIG. 11 shows the relationship between the air supply / exhaust time, the pressure in the chamber, and the liquid crystal injection amount for suitably realizing the liquid crystal injection according to the third embodiment of the present invention. The horizontal axis in the figure is the supply / exhaust air time (minutes), the left vertical axis is the first and second chamber pressures (mHg), and the right vertical axis is the liquid crystal injection amount (%). The pressure curve p1 is the pressure in the first chamber (31), and the pressure curve p2 is the pressure in the second chamber (30), indicating supercharging and exhausting, respectively. As in the first and second embodiments, the supercharging rate of the pressure curve p1 and the evacuation rate of the pressure curve p2 are initially small and are increased later, so that the liquid crystal is injected at a substantially constant rate. However, the total supercharging amount and the total exhausting amount are smaller than those in the first embodiment and the second embodiment, respectively, and the ultimate pressure is 90% in the first chamber (31).
At 0 mHg, it is lower than the first embodiment, and the second chamber (30) is higher at 600 mHg than in the second embodiment. In addition, as described above, in order to prevent problems such as alignment abnormality and cell gap change, the implantation time is set to about 5 minutes in the embodiment shown in FIG. 11, but if these problems are solved, the present embodiment will provide the best possible. Throughput is obtained.

[0033]

According to the present invention, in a liquid crystal injection method and a liquid crystal injection apparatus for completing a liquid crystal display device by injecting a liquid crystal into a gap where a pair of electrode substrates are bonded, a liquid crystal injection hole communicating with the gap is filled with a liquid crystal reservoir. By immersing the liquid crystal in the liquid crystal reservoir, the pressure applied to the liquid crystal reservoir is made larger than the air pressure applied to the side of the exhaust hole communicating with the slit. While deaeration is performed, liquid crystal injection is performed by relatively small pressure change control. Since the total amount of intake and exhaust is small, the time required for return pressure after reaching the predetermined pressure state is reduced, and the throughput is improved. In addition, since the required reduced pressure or increased pressure is small, the processing chamber is not required to have high pressure resistance and airtightness, and the apparatus cost is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a liquid crystal injection device according to a first embodiment of the present invention.

FIG. 2 is a conceptual front view of the liquid crystal injection device according to the first embodiment of the present invention.

FIG. 3 is a structural diagram of a liquid crystal display device applied to the liquid crystal injection method of the present invention.

FIG. 4 is a structural diagram of a liquid crystal display device applied to the liquid crystal injection method of the present invention.

FIG. 5 is a diagram showing a relationship among a supercharging time, a chamber pressure, and a liquid crystal injection amount in order to suitably realize the liquid crystal injection method according to the first embodiment of the present invention.

FIG. 6 is a schematic side view of a liquid crystal injection device according to a second embodiment of the present invention.

FIG. 7 is a front conceptual view of a liquid crystal injection device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a relationship among an evacuation time, a chamber pressure, and a liquid crystal injection amount in order to suitably realize a liquid crystal injection method according to a second embodiment of the present invention.

FIG. 9 is a schematic side view of a liquid crystal injection device according to a third embodiment of the present invention.

FIG. 10 is a conceptual front view of a liquid crystal injection device according to a third embodiment of the present invention.

FIG. 11 is a diagram showing a relationship between a supply / exhaust time, a chamber pressure, and a liquid crystal injection amount in order to suitably realize a liquid crystal injection method according to a third embodiment of the present invention.

[Explanation of symbols]

 10, 20, 30 Second chamber 11, 21, 31 First chamber 12, 22, 32 Liquid crystal reservoir 13, 24, 34, 36 Intake system 14, 23, 33, 36 Exhaust system 15, 25, 37 Support Unit 16, 26, 38 Liquid crystal 17, 27, 39 Indicator before liquid crystal injection 18, 28, 40 Inlet 19, 29, 41 Exhaust 11a, 21a, 31a Packing

Claims (7)

[Claims] 1. A liquid crystal display device in which a liquid crystal display device in which a liquid crystal is sealed in a gap between a pair of electrode substrates is in a state before completion of the liquid crystal display device. In a liquid crystal injection method of injecting liquid crystal into a front display, the display before liquid crystal injection has an injection hole and an exhaust hole leading to an internal slit, and the injection hole is immersed in a liquid crystal reservoir. The air pressure is made larger than the air pressure applied to the exhaust hole, and the difference between these pressures causes the liquid crystal to flow from the injection hole into the narrow space inside the display before liquid crystal injection, and the liquid crystal is injected from the exhaust hole. A method for injecting liquid crystal, comprising: discharging air in a narrow space inside the front display. 2. The liquid crystal injection method according to claim 1, wherein the pressure in a space surrounding the periphery of the liquid crystal reservoir is increased. 3. The liquid crystal injection method according to claim 1, wherein the pressure in a space including the exhaust hole and being continuously and spatially sealed from the inside of the display before liquid crystal injection is reduced. 4. A liquid crystal display device in which a liquid crystal is sealed in a gap between a pair of electrode substrates before completion of the liquid crystal display device. The pair of electrode substrates are bonded together with a gap into which a liquid crystal is loaded. In a liquid crystal injection device for injecting liquid crystal into a display before liquid crystal injection having an injection hole and an exhaust hole leading to a gap, a liquid crystal storage container in which liquid crystal is stored and the liquid crystal storage container in which the injection hole is immersed are sealed inside. A first chamber, and a second chamber that is at least sealed with the exhaust hole therein, and is spatially continuous from the inside of the display before liquid crystal injection;
The air pressure in the first chamber is higher than the air pressure in the second chamber, and the difference between these pressures causes the liquid crystal in the liquid crystal reservoir to flow from the injection hole to the slit inside the liquid crystal display. A liquid crystal injecting device, wherein the air is allowed to flow in and at the same time the air in the narrow space inside the liquid crystal injecting display is exhausted from the exhaust hole. 5. The liquid crystal injection device according to claim 4, wherein the second chamber has the display before liquid crystal injection, the liquid crystal reservoir and the first chamber sealed inside. 6. The liquid crystal injection device according to claim 4, wherein the pressure in the first chamber is increased by supercharging. 7. The liquid crystal injecting device according to claim 4, wherein the pressure in the second chamber is reduced by exhaustion.