KR100420524B1 - The liquid crystal filling method and the same apparatus of LCD - Google Patents

Abstract

According to the present invention, the liquid crystal injector of the conventional liquid crystal display device has a problem in that the time required for the liquid crystal injection becomes longer as the screen is enlarged and defects such as bubbles are generated inside the panel, and the liquid crystal is not completely injected. Because of this,

Adsorbing the upper plate while adsorbing the lower plate in a vacuum state to approach the lower plate; Supplying a liquid crystal to the liquid crystal retainer and then rotating the upper and lower plates in opposite directions to fill the liquid crystal between the liquid crystal retainers; Attaching the upper and lower plates to each other and recovering the liquid crystal remaining in the liquid crystal retainer; Lowering the inside of the chamber to a predetermined pressure or lower and increasing the pressure to a predetermined pressure; Rotating the lower plate at a high speed to remove liquid crystals between the bonding gaps of the substrate and a part of the external liquid crystals, and then injecting the curing liquid into the gaps on the four surfaces; Curing the cured liquid to completely seal the two substrates to form a cemented panel; By consisting of

Since the liquid crystal is injected while the substrate is in close proximity, the time required for the liquid crystal injection can be shortened regardless of the size of the liquid crystal display device. And to an apparatus.

Description

The liquid crystal filling method and apparatus of the liquid crystal display device {The liquid crystal filling method and the same apparatus of LCD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal injection method and apparatus for injecting liquid crystal into a liquid crystal display device formed by attaching two substrates with a small gap. Particularly, a liquid crystal injection speed is achieved by injecting liquid crystal in a state in which the liquid crystal is not attached completely. It relates to a liquid crystal injection method and apparatus for a liquid crystal display device to significantly improve the.

A liquid crystal display is one of flat panel displays used in notebook computers, wall-mounted TVs, and the like, and is a device formed by injecting liquid crystal between two upper and lower plates with a predetermined gap attached thereto. Therefore, injecting the liquid crystal between the upper and lower plates is very important, and filling the liquid crystals to every corner requires a high level of technical skill.

Related patents describe the shape of injection holes that can solve the sealant drain problem in US 0051814239A, and US 6195149 simplifies the process by injecting liquid crystals by making liquid crystal injection holes in all panels of the entire glass. The technique is described, and US 6271907 B1 describes a technique which facilitates the injection of liquid crystal by making the position of the liquid crystal injection port parallel to the upper and lower electrode formation. In addition, US 005933209A describes a method for solving the peeling off phenomenon of the sealant due to the difference in adhesion between the glass and the ITO electrode, the ITO electrode, and the sealant of the liquid crystal injection hole, and US 005477349A describes a certain amount of liquid crystal in the liquid crystal injection hole. A method for reducing the consumption of liquid crystal attached to the outside of the panel by supplying the device is described. US 6288766 B1 describes a device for inducing the liquid crystal to be evenly injected while controlling the pressure by separating the liquid crystal injection port and the air exhaust port. have. In addition, US 06095203 describes a device for injecting liquid crystal by intersecting a liquid crystal inlet and an inlet separately, and US 5594572 describes a technique for increasing flatness by mixing a ball gap for holding cell gaps with different hardness. .

The techniques described in the above patents relate to a method of injecting a liquid crystal through a liquid crystal injection hole, and various methods for improving the shape of the liquid crystal injection hole and its function are considered.

Conventional liquid crystal injection apparatus is a panel formed by sealing the upper plate 11 and the lower plate 12, leaving only the hole (13 ') through which the liquid crystal can be injected into the sealant 13, as shown in FIG. A liquid crystal container 14 positioned below the panel and filled with liquid crystal, an ultrasonic vibrator 15 coupled to an upper end of the panel to vibrate the panel, a chamber 10 in which the above devices are installed, and the chamber A vacuum pump 16 connected to the vacuum exhaust pipe 17 to the vacuum pump 16 for evacuating the inside of the chamber 10, and a pneumatic valve 18 installed in the nitrogen supply line 18 for supplying nitrogen into the chamber 10. ') And a vacuum gauge 19 for sensing the degree of vacuum in the chamber 10.

The conventional liquid crystal injection device configured as described above injects liquid crystal into a panel using a capillary phenomenon and ultrasonic vibration.

The upper plate 11 and the lower plate 12 are sealed with a sealant 13 at intervals of about 4 to 5 μm to form a panel. At this time, of course, the small hole 13 ′ is formed in the panel so that the liquid crystal can be injected. The panel thus formed is positioned inside the chamber 10 with the hole 13 'facing the liquid crystal container 14, and the inside of the chamber 10 is evacuated using the vacuum pump 16.

When the inside of the chamber 10 is evacuated, the air inside the panel is also evacuated through the hole 13 'to be in a vacuum state. In this state, the panel is lowered to immerse the surface having the hole 13 'in the liquid crystal container 14 so that the liquid crystal is injected into the panel through the hole 13'. To this end, nitrogen is supplied into the chamber 10 through the nitrogen supply line 18. When the pressure inside the chamber 10 reaches about 500 Torr, the pneumatic valve 18 'of the nitrogen supply line 18 is shut off. To stop the nitrogen supply. In this case, since the pressure inside the chamber 10 and the pressure inside the panel are greatly different, the liquid crystal of the liquid crystal container 14 is injected into the panel through the hole 13 ′.

At this time, the ultrasonic vibrator 15 installed on the upper end of the panel vibrates the panel to facilitate the penetration of the liquid crystal. This is because the gap between the upper plate 11 and the lower plate 12 forming the panel is very narrow. In addition, since the pattern is formed on the upper plate 11 and the lower plate 12 to act as an obstacle for penetrating the liquid crystal, the role of the ultrasonic vibrator 15 is essential.

When the liquid crystal fills the inside of the panel, lift the panel to wipe off the liquid crystal around the hole 13 ', apply the UV curing agent to seal the hole 13', and then completely cure the UV curing agent using an ultraviolet lamp. Seal.

However, the liquid crystal injector of the conventional liquid crystal display device has a long time taken for the liquid crystal injection as the size of the screen is enlarged, defects such as bubbles are generated inside the panel, and the liquid crystal is not completely injected. There is a problem.

In other words, liquid crystal display devices are currently being enlarged in size from 29 inches to 40 inches in a 20-inch screen for a TFT LCD for TV. However, injecting the liquid crystal through the small liquid crystal injection hole takes more than 24 hours to inject the liquid crystal, bubbles are generated inside the liquid crystal is not completely injected, thereby degrading the quality of the product. Thus, liquid crystal injection into a large model is almost impossible with the current method.

In addition, the gap between the upper plate and the lower plate forming the panel is only 4-5 μm, and liquid crystal injection is delayed due to various patterns, and the gap is developed according to the development of a model for the purpose of improving display brightness and securing a wide viewing angle. As this becomes narrower, liquid crystal injection becomes more difficult.

In addition, a wavy liquid crystal injection trace remains at the injection hole portion where the liquid crystal is injected, and the trace quality deteriorates the product. As the liquid crystal is diffused inside the panel, the liquid crystal of the liquid crystal container is injected into the panel through the liquid crystal injection hole at a predetermined time difference, thereby leaving a wavy liquid crystal injection trace.

The present invention has been made to solve the above problems of the prior art, the liquid crystal is not injected while the upper and lower plates are completely attached, the liquid crystal is injected between the two substrates in the state in which the upper and lower plates are in close proximity to the two substrates It is an object of the present invention to provide a liquid crystal injection method and apparatus for a liquid crystal display device which can significantly reduce the liquid crystal injection time.

1 is a configuration diagram showing a conventional liquid crystal injection device,

2 is a block diagram showing a liquid crystal injection device according to the present invention,

3 is a view showing an injection form of the liquid crystal curing liquid,

4 is an enlarged view of a portion “A” of FIG. 3;

5 is a view illustrating a state in which an external liquid crystal is removed using a rubber blade which is a main component of the present invention.

<Explanation of symbols on main parts of the drawings>

50: upper plate rotating means 51: electrostatic chuck

52: upper rotary motor 53: top plate rotating plate

54 electrode fixing part 55 dry air filter unit

60: lower plate rotating means 61: vacuum chuck

62: lift guide 63: lower plate rotating plate

64: rotation escape prevention portion 64 ': release prevention pin

70 liquid crystal retainer 75 liquid crystal supply unit

80: drive motor 85: lower rotary shaft

90 dispenser 91 liquid crystal retaining polymer ring pattern

93: fixed spacer 95: rubber blade

100: upper plate 105: lower plate

The present invention for solving the above technical problem is a first step of placing the lower plate inside the liquid crystal retainer and vacuum adsorption, adsorbing the upper plate and then approaching the lower plate; Supplying the liquid crystal to the liquid crystal retainer and then rotating the upper and lower plates in opposite directions to fill the liquid crystal between the two; Attaching an upper plate and a lower plate to each other, and recovering the remaining liquid crystal in the liquid crystal retainer; A fourth step of lowering the inside of the chamber to a predetermined pressure or less and supplying clean air to increase the pressure inside the chamber to a predetermined pressure; Rotating the lower plate rotating plate at a high speed to remove liquid crystals between the bonding gaps of the substrate and a part of the external liquid crystals, and then injecting the curing liquid into the gaps on the four surfaces; A sixth step of curing the curing liquid to completely seal the two substrates to form a bonding panel; Characterized in that consisting of.

Apparatus for applying the above method includes an upper plate rotating means for moving the upper plate up and down and rotating to a certain degree, a lower plate rotating means for rotating the lower plate at the same time and a certain amount rotating, and a driving means for driving the lower plate rotating means. And a liquid crystal retainer for filling the liquid crystal therein to allow the liquid crystal to be injected between the upper plate and the lower plate, a liquid crystal supply unit for supplying or receiving the liquid crystal to the liquid crystal retainer, and an upper plate at a predetermined distance from the liquid crystal interposed therebetween. It is characterized by consisting of joining means for joining the lower plate.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

The liquid crystal injection method of the liquid crystal display according to the present invention comprises the first step of placing the lower plate inside the liquid crystal retainer and then vacuum adsorbing, adsorbing the upper plate and adjoining the lower plate; Supplying the liquid crystal to the liquid crystal retainer and then rotating the upper and lower plates in opposite directions to fill the liquid crystal between the two; Attaching an upper plate and a lower plate to each other, and recovering the remaining liquid crystal in the liquid crystal retainer; A fourth step of lowering the inside of the chamber to a predetermined pressure or less and supplying clean air to increase the pressure inside the chamber to a predetermined pressure; Rotating the lower plate rotating plate at a high speed to remove liquid crystals between the bonding gaps of the substrate and a part of the external liquid crystals, and then injecting the curing liquid into the gaps on the four surfaces; A sixth step of curing the curing liquid to completely seal the two substrates to form a bonding panel; A seventh step of recovering the liquid crystal remaining on the outside of the bonding panel when the sealing of the substrate is completed and using it for regeneration; An eighth step is performed to clean the liquid crystal remaining on the surface after transferring the bonding panel to the outside of the chamber.

The fourth step is a first step of lowering the pressure inside the chamber to 100 Torr, a second step of blocking the rotation of the bonding panel attached to the upper plate and the lower plate, and supplying clean air to the chamber until the 600 Torr The third process of raising the pressure inside, and the fourth process of removing the liquid crystal in the gap between the substrate bonding portion and the external liquid crystal part by using the rotational force of the lower plate rotating plate.

The liquid crystal injection device of the liquid crystal display device of the present invention for applying the above method is the upper plate rotating means 50 for moving the upper plate 100 up and down at a time, as shown in Figures 2 to 5, A lower plate rotating means 60 for moving the lower plate 105 up and down and rotating about a predetermined amount; a driving means for driving the lower plate rotating means 60; and a liquid crystal filled in the upper plate 100 and the lower plate 105. The liquid crystal retainer 70 for injecting the liquid crystal between the liquid crystal, the liquid crystal supply unit 75 for supplying or receiving the liquid crystal to the liquid crystal retainer 70, and the upper plate 100 at a position spaced apart by a predetermined degree with the liquid crystal interposed therebetween. ) And bonding means for bonding the lower plate 105, external liquid crystal removing means for collecting liquid crystal around the bonded substrate after the upper plate 100 and the lower plate 105 are bonded, and the upper plate 100 and the lower plate 105. ) Bonded substrate is transferred to the outside If it is composed of cleaning means for washing the liquid crystal remaining on the surface.

Here, when the upper plate 100 and the lower plate 105 is in close contact with each other, the interval maintaining means is installed as shown in FIG. 5 to maintain the gap between the two, any of the upper plate 100 and the lower plate 105 One side is a fixed spacer 93 installed by etching, and is removed when the adhesion of the upper plate 100 and the lower plate 105 is completed. In addition, the liquid crystal retaining means is provided between the upper plate 100 and the lower plate 105 so that the liquid crystal introduced between the two is not separated by the centrifugal force, and the liquid crystal retaining polymer ring shown in FIGS. 4 and 5 is provided. Pattern 91 is that.

The upper plate rotating means 50 is an electrostatic chuck (51) for adsorbing the upper plate 100, the upper plate rotating plate 53 which is installed as the center of rotation of the upper plate 100 to be moved up and down, and An upper plate rotating motor 52 installed at the electrostatic chuck 51 and having one end of the rotating fixed shaft 52 ′ fixed to the upper plate rotating plate 53 to rotate the electrostatic chuck 51, and the upper plate rotating plate 53. And a dry air filter unit 55 which is formed integrally with one another and supplies clean air to the inside of the chamber, and is formed at one side of the electrostatic chuck 51 so that the electrostatic chuck 51 adsorbs the top plate 100. The electrode fixing part 54 which protects the electrode of 100 is comprised.

The lower plate rotating means 60 is installed at the bottom of the liquid crystal retainer 70 and rotated by the driving means, and is installed at the corners of the lower plate rotating plate 63 and the lower plate 105, respectively. When the lift guide 62 for moving the up and down, the vacuum chuck 61 mounted on the lift guide 62 to suck the lower plate 105, and the lower plate rotating plate 63 are rotated. The lower plate 105 is constituted by a rotational separation prevention unit 64 which blocks the separation from the vacuum chuck 61.

The rotational separation prevention unit 64 is provided at the edge position of the lower plate 105 in the longitudinal direction and is movable on the pair of rails 64 'and the both ends of the rails 64', respectively. And a release preventing pin 64 ″ formed at four corners of the lower plate 105 to prevent the lower plate 105 from being detached during rotation. The driving unit has one end of the liquid crystal retainer 70. It consists of a lower rotary shaft 85 connected to the lower plate rotating means 63 and a drive motor 80 for rotating the lower rotary shaft 85 through.

The bonding means is a dispenser 90 for injecting the curing liquid 92 into the gap between the upper plate and the lower plate, as shown in Figures 3 and 4 and the curing liquid 92 to cure the upper plate and the lower plate completely It consists of hardening means. Here, the curing liquid 92 is a UV curing liquid that is cured by ultraviolet light, the curing means is ultraviolet (UV) for curing the UV curing liquid.

The external liquid crystal removing means is a rubber blade 95 for removing the liquid crystal while the front end is moved along the surface of the upper plate 100 and the lower plate 105 as shown in Figure 5, the upper plate 100 and the lower plate ( 105) to prevent damage to rubber. In addition, since the washing means may use a known device, it will not be shown in the drawings.

The liquid crystal injection device of the liquid crystal display device of the present invention configured as described above injects the liquid crystal between the two while the upper plate and the lower plate are in proximity without using the principle of siphon.

When the lower plate 105 is loaded into the chamber, the lift guide 62 is raised to position and lower the lower plate 105 on the vacuum chuck 61. At this time, a vacuum is applied to the vacuum chuck 61 to flatten the lower plate 105. Subsequently, when the top plate 100 is loaded, the electrostatic chuck 51 is lowered and slightly rises after absorbing the top plate 100. Since the robot arm (not shown) for loading the substrate completely exits the outside of the chamber, the upper plate rotating plate 53 is greatly lowered and the upper plate rotating motor 52 is driven so that the electrostatic chuck with the rotating fixed shaft 52 'fixed thereto. While 51 is finely rotated, it is lowered slowly while making fine adjustments. The rotating fixed shaft 52 ′ lowers the electrostatic chuck 51 so that the upper plate 100 maintains a distance close to the lower plate 105, and preferably maintains an interval of 1 mm or less.

When the positions of the upper plate 100 and the lower plate 105 are determined through the above process, the liquid crystal supply unit 75 supplies the liquid crystal to the liquid crystal retainer 70. In this case, the upper plate 100 and the lower plate 105 are located inside the liquid crystal retainer 70, and as the liquid crystal is supplied to the liquid crystal retainer 70, the lower plate 105 is completely submerged in the liquid crystal, and the upper plate. 100 adjusts the amount of the liquid crystal so that only about 1/2 of the liquid crystal is submerged. In this state, the upper plate 100 rotates in the counterclockwise direction by the operation of the upper plate rotating motor 52, and the lower plate rotating plate 63 is rotated by the driving motor 80 to be absorbed by the vacuum chuck 61. 105 is rotated clockwise. Here, the rotation speed of the upper plate 100 and the lower plate 105 is very slow, and is continuously rotated for a predetermined time so that the liquid crystal is sufficiently absorbed in the pattern formed on the substrate (100, 105), as well as the upper plate 100 and the lower plate 105 So that the liquid crystal can be filled completely without any space between them.

Thereafter, the vacuum chuck 61 is raised by using the guide lift 62 to completely remove both the upper plate 100 and the lower plate 105 from the liquid crystal, and the upper plate 100 and the upper plate 100 with the fixed spacer 93 interposed therebetween. The lower plates 105 are attached to each other. Here, a gap between the upper plate 100 and the lower plate 105 is maintained by the fixed spacer 93, and the fixed spacer 93 is placed on either side of the upper plate 100 or the lower plate 105. The upper plate 100 and the lower plate 105 is not in direct contact with each other. When the upper plate 100 and the lower plate 105 are completely separated from the liquid crystal, the liquid crystal supply unit 75 collects the remaining liquid crystal in the liquid crystal retainer 70.

Subsequently, the pressure inside the chamber is lowered to 100 Torr, and the upper plate 100 and the lower plate 105 are held at the time of rotation by using the release preventing pin 64 ″ of the rotational release preventing unit 64. In this state, the lower plate rotating plate 63 is rotated at a high speed using the drive motor 80 while supplying clean air through the dry air filter unit 55 to gradually increase the pressure in the chamber. The dry air filter unit 55 supplies clean air until the pressure inside the chamber reaches 600 Torr, and the lower plate rotating plate 63 is continuously rotated.

As the lower plate rotating plate 63 rotates at a high speed, the liquid crystal remaining in the bonding gap between the two substrates and the liquid crystal remaining outside are separated by the centrifugal force. At this time, since the liquid crystal retaining polymer ring pattern 91 is formed between the upper plate 100 and the lower plate 105, the liquid crystal between the upper plate 100 and the lower plate 105 does not leak out even when centrifugal force is generated. .

Thereafter, the ultraviolet curing liquid 92 is introduced between the gaps between the two substrates using the dispenser 90, and the ultraviolet rays are irradiated to completely seal the two substrates to form a bonding panel. When the bonding panel is completed by sealing the substrate, as shown in FIG. 5, the fixed spacer 93 provided between the two substrates is removed, and the flat surface of the upper plate 100 and the lower plate 105 using the rubber blade 95 is removed. Collect the liquid crystal in. The collected liquid crystals are preferably collected separately for regeneration.

After the removal of the external liquid crystal is completed, the bonding panel is unloaded to the outside of the chamber, and the liquid crystal remaining on the surface of the bonding panel is completely removed by cleaning the surface of the bonding panel using a conventional washing apparatus. This plays a very important role in securing the stability of the laminated panel.

Here, the characteristics of the present invention as compared with the conventional liquid crystal injection technology are as follows.

First, the liquid crystal injection time can be reduced regardless of the size of the liquid crystal display. In the conventional apparatus, the liquid crystal is injected using the vacuum degree and capillary phenomenon in the packed panel except for the injection hole. However, as the liquid crystal display device is enlarged, the liquid crystal injection time becomes very long, about 24 hours. However, in the present invention, since the liquid crystal can be evenly distributed on the entire surface at the same time by the bonding method, the liquid crystal can be cleanly filled without bubbles within 10 minutes.

Second, bubbles are not generated in the liquid crystal cell inside the bonding panel. In the conventional apparatus, vacuum and capillary phenomena are used, so that the liquid crystal is not completely injected, bubbles are generated inside the bonding panel, and the quality of the product is degraded. In the case of a large model, the injection is almost impossible. However, in the present invention, the liquid crystal is completely filled between the upper plate and the lower plate and rotated in opposite directions, and the liquid crystal injection without bubbles is possible at the front side by sufficiently filling the liquid crystal to the edge of the detailed pattern while adjusting the rotation speed thereof.

Third, the liquid crystal can be injected quickly regardless of the shape of the pattern and the distance between the upper plate and the lower plate. Since the distance between the upper plate and the lower plate is very narrow (4 to 5㎛), it takes a very long time to inject the liquid crystal, but the gap between the two substrates is getting narrower to improve the brightness of the display and to secure the wide viewing angle. This makes the liquid crystal injection process more difficult. However, in the present invention, gap filling using the liquid crystal at the same speed becomes possible regardless of the size and shape of the bonding panel as well as the gap size of the upper and lower electrodes.

Fourth, the injection speed of the liquid crystal can be maintained regardless of the size of the product. Currently, TV TFT LCDs are mainly producing 20-inch products, but are being enlarged to more than 29 inches and 40 inches, and as the size of the products increases, the liquid crystal injection time is longer than four times and the failure rate is improved. have. However, in the present invention, the liquid crystal may be injected at the same speed regardless of the size of the product by adjusting the size of some equipment such as a chamber or a liquid crystal retainer.

Finally, injection defects hardly appear over the entire liquid crystal. In the prior art, since the liquid crystal is injected through the liquid crystal injection hole, a wavy liquid crystal injection trace appears in the liquid crystal injection hole. However, in the present invention, since there is no liquid crystal injection hole, unstaining defects generated during the liquid crystal injection process can be prevented in advance.

As described above, since the liquid crystal injection method and apparatus of the liquid crystal display according to the present invention inject the liquid crystal in a state in which the substrate is in close proximity, the time required for the liquid crystal injection can be shortened regardless of the size of the liquid crystal display device. There is an advantage that the defects around the injection port does not occur.

Claims (31)

Positioning the lower plate inside the liquid crystal retainer and then vacuum adsorbing, adsorbing the upper plate and then approaching the lower plate; Supplying the liquid crystal to the liquid crystal retainer and then rotating the upper and lower plates in opposite directions to fill the liquid crystal between the two; Attaching an upper plate and a lower plate to each other, and recovering the remaining liquid crystal in the liquid crystal retainer; A fourth step of lowering the inside of the chamber to a predetermined pressure or less and supplying clean air to increase the pressure inside the chamber to a predetermined pressure; Rotating the lower plate rotating plate at a high speed to remove liquid crystals between the bonding gaps of the substrate and a part of the external liquid crystals, and then injecting the curing liquid into the gaps on the four surfaces; A sixth step of curing the curing liquid to completely seal the two substrates to form a bonding panel; Liquid crystal injection method of the liquid crystal display device characterized in that consisting of. The method of claim 1, And a seventh step of recovering the liquid crystal remaining on the outside of the bonding panel when the sealing of the substrate is completed and using it for regeneration. The method according to claim 1 or 2, And an eighth step of cleansing the liquid crystal remaining on the surface after transferring the cemented panel to the outside of the chamber. The method of claim 1, The liquid crystal injection method of the liquid crystal display device, characterized in that the distance between the upper plate and the lower plate in the first step to be close to 1 mm or less. The method of claim 1, The first liquid crystal injection method of the liquid crystal display device, characterized in that for using the fixed spacer to maintain the gap between the upper plate and the lower plate. The method of claim 5, The fixed spacer is a liquid crystal injection method of the liquid crystal display device characterized in that the etching is installed on any one side of the upper plate and the lower plate. The method of claim 1, And in the second step, the lower plate is completely immersed in the liquid crystal and the upper plate is supplied with the liquid crystal so as to be immersed in only about 1/2 of the liquid crystal display device. The method of claim 1, The second step is a liquid crystal injection method of the liquid crystal display device characterized in that the liquid crystal is not completely removed by using the liquid crystal retaining ring pattern provided on the edge when the upper plate and the lower plate is rotated in the opposite direction. The method of claim 1, The liquid crystal injection method of the liquid crystal display device, characterized in that the liquid crystal is sufficiently absorbed in the fine pattern by rotating slowly for a predetermined time when the upper plate and the lower plate is rotated in the opposite direction in the second step. The method of claim 1, The fourth step is a first step of lowering the pressure in the chamber to 100 Torr, a second step of blocking the rotation of the bonding panel attached to the upper plate and the lower plate, and supplying clean air until a predetermined pressure And a fourth step of increasing the pressure inside the chamber and a fourth step of removing the liquid crystal in the gap between the substrate and the external liquid crystal by using the rotational force of the lower plate rotating plate. The method of claim 10, The predetermined pressure of the third process is 600 Torr, the liquid crystal injection method of the liquid crystal display device. The method of claim 10, And a lower plate rotating plate supporting the lower plate while the second and third processes are performed. The method of claim 1, The curing liquid of the fifth step and the sixth step is cured by ultraviolet light so that the upper plate and the lower plate is bonded to the liquid crystal injection method of the liquid crystal display device. The method according to claim 1 or 2, The seventh step is a liquid crystal injection method of the liquid crystal display device, characterized in that the liquid crystal remaining on the flat surface of the upper plate and the lower plate using the blade after the fabrication of the bonding panel is used for regeneration. An upper plate rotating means for moving the upper plate up and down and rotating at a time, a lower plate rotating means for moving the lower plate up and down and rotating at a time, a driving means for driving the lower plate rotating means, and a liquid crystal filled in the upper plate A liquid crystal retainer for injecting the liquid crystal between the lower plate and the lower plate, a liquid crystal supply unit for supplying or receiving the liquid crystal to the liquid crystal retainer, and bonding means for bonding the upper plate and the lower plate at positions spaced to a predetermined degree with the liquid crystal interposed therebetween. A liquid crystal injection device of a liquid crystal display device. The method of claim 15, And an external liquid crystal removing means for collecting liquid crystals around the bonded substrate after the upper plate and the lower plate are bonded to each other. The method according to claim 15 or 16, And a cleaning means for cleaning the liquid crystal remaining on the surface of the bonded substrate on which the upper and lower plates are bonded to the outside. The method of claim 15, Liquid crystal injection apparatus of the liquid crystal display device, characterized in that the gap holding means for maintaining the gap between the upper plate and the lower plate when the two close contact. The method of claim 18, The gap maintaining means is a liquid crystal injection device of a liquid crystal display device, characterized in that a fixed spacer provided by etching one side of the upper plate and the lower plate is used. The method of claim 15, And a liquid crystal retaining means provided between the upper plate and the lower plate to prevent the liquid crystal introduced therebetween from being separated by the centrifugal force. The method of claim 15, The upper plate rotating means includes an electrostatic chuck that adsorbs the upper plate, an upper plate rotating plate that becomes a rotation center of the upper plate and is movable up and down, and one end of the rotating fixing shaft fixed to the upper plate rotating plate is installed on the electrostatic chuck. A liquid crystal injection device of a liquid crystal display device, characterized in that composed of a rotating upper plate rotating motor. The method of claim 21, And the upper plate rotating means is integrally formed with the upper plate rotating plate and includes a dry air filter unit supplying clean air into the chamber. The method of claim 21, The electrostatic chuck is provided with an electrode fixing part for protecting the electrode of the upper plate when the upper plate is adsorbed. The method of claim 15, The lower plate rotating means is installed on the bottom of the liquid crystal retainer and is rotated by the driving means, the lower guide rotating plate is respectively installed on the corner of the lower plate rotating plate and the lower plate moves up and down, the form mounted on the lift guide And a vacuum chuck installed to suck the lower plate. The method of claim 24, And the lower plate rotating means has a rotational release preventing portion that blocks the substrate from being separated from the vacuum chuck when the lower plate rotating plate is rotated. The method of claim 25, The anti-rotation departure prevention portion is provided in the longitudinal direction at the edge position of the lower plate and a pair of rails that are movable in the longitudinal direction, respectively formed on both ends of the rail and located at the four corners of the lower plate respectively to rotate the substrate Liquid crystal injection device of the liquid crystal display device, characterized in that composed of the escape prevention pin to prevent the departure. The method of claim 15, And the driving part includes a lower rotating shaft having one end penetrating through the liquid crystal retainer and connected to the lower plate rotating means, and a driving motor for rotating the lower rotating shaft. The method of claim 15, Wherein the bonding means comprises a dispenser for injecting the curing liquid into the gap between the upper plate and the lower plate, and the curing means for curing the curing liquid to completely seal the upper plate and the lower plate. The method of claim 28, The curing liquid is a UV curing liquid which is cured by ultraviolet light is used, the curing means is a liquid crystal injection device of a liquid crystal display device, characterized in that the ultraviolet. The method of claim 15, The external liquid crystal removing means of the liquid crystal injection device of the liquid crystal display device, characterized in that the front end portion is moved along the surface of the upper plate and the lower plate to remove the liquid crystal. The method of claim 30, And the blades are formed of rubber so as not to damage the upper and lower plates.