KR20030076786A - Liquid crystal dispensing apparatus - Google Patents

Abstract

PURPOSE:An apparatus for dispensing liquid crystal is provided to dispense liquid crystal on a substrate by controlling a needle with magnetic force, thereby simplifying a structure and reducing the manufacturing cost. CONSTITUTION:A liquid crystal container(124) is filled with liquid crystal, and gas is applied to an upper part of the liquid crystal container to give pressure to the liquid crystal. A needle sheet(143) is mounted at a lower part of the liquid crystal container and has an exhaust hole exhausting liquid crystal of the liquid crystal container. A needle(136) is inserted into the liquid crystal container to be movable up and down. The up-and-down movements of the needle is controlled by generating magnetic force at upper and lower parts of the needle. At the upper part of the needle, the magnetic force is generated by a solenoid coil(130) and a magnetic stick(132) mounted at the upper part At the lower part of the needle, the magnetic force is generated by the needle or needle sheet formed of a permanent magnetic material. The magnetic force of the upper part is stronger than the magnetic force of the lower part, so that the needle ascends to open the exhaust hole if power is supplied to the solenoid coil and the needle descends to close the exhaust hole if the power supply is terminated.

Description

Liquid crystal dropping device {LIQUID CRYSTAL DISPENSING APPARATUS}

The present invention relates to a liquid crystal dropping device (Liquid Crystal Dispensing Apparatus), in particular the needle sheet formed with a discharge hole or the end of the needle dropping the liquid crystal on the actual substrate in contact with the discharge hole formed of a magnetic material to apply the power It relates to a liquid crystal dropping device capable of controlling the opening time of the discharge hole by the magnetic force generated by the.

Recently, with the development of various portable electronic devices such as mobile phones, PDAs, and notebook computers, there is a growing demand for flat panel display devices for light and thin applications. Such flat panel displays are being actively researched, such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), FED (Field Emission Display), VFD (Vacuum Fluorescent Display), but mass production technology, ease of driving means, Liquid crystal display devices (LCDs) are in the spotlight for reasons of implementation.

LCD is a device for displaying information on the screen using the refractive anisotropy of the liquid crystal. As shown in FIG. 1, the LCD 1 is composed of a lower substrate 5 and an upper substrate 3 and a liquid crystal layer 7 formed between the lower substrate 5 and the upper substrate 3. The lower substrate 5 is a drive element array substrate. Although not shown in the figure, a plurality of pixels are formed on the lower substrate 5, and a driving element such as a thin film transistor (hereinafter referred to as TFT) is formed in each pixel. The upper substrate 3 is a color filter substrate, and a color filter layer for real color is formed. In addition, a pixel electrode and a common electrode are formed on the lower substrate 5 and the upper substrate 3, respectively, and an alignment film for aligning liquid crystal molecules of the liquid crystal layer 7 is coated.

The lower substrate 5 and the upper substrate 3 are bonded by a sealing material 9, and a liquid crystal layer 7 is formed therebetween by a driving element formed on the lower substrate 5. Information is displayed by controlling the amount of light passing through the liquid crystal layer by driving the liquid crystal molecules.

The manufacturing process of the liquid crystal display device can be largely divided into a driving element array substrate process of forming a driving element on the lower substrate 5, a color filter substrate process of forming a color filter on the upper substrate 3, and a cell process. However, the process of the liquid crystal display will be described with reference to FIG. 2.

First, a plurality of gate lines and data lines arranged on the lower substrate 5 to define a pixel region are formed by a driving element array process, and the gate line and the data are formed in each of the pixel regions. A thin film transistor which is a driving element connected to the line is formed (S101). In addition, the pixel electrode is connected to the thin film transistor through the driving element array process to drive the liquid crystal layer as a signal is applied through the thin film transistor.

In addition, the upper substrate 3 is formed with a color filter layer and a common electrode of R, G, B to implement the color by the color filter process (S104).

Subsequently, an alignment layer is applied to the upper substrate 3 and the lower substrate 5, respectively, and then the alignment control force or surface fixing force (ie, the liquid crystal molecules of the liquid crystal layer formed between the upper substrate 3 and the lower substrate 5). In order to provide a pretilt angle and an orientation direction, the alignment layer is rubbed (S102 and S105). Subsequently, a spacer is disposed on the lower substrate 5 to maintain a constant cell gap, and a sealing material 9 is applied to an outer portion of the upper substrate 3, and then the lower substrate 5 is disposed. And the upper substrate 3 by applying pressure (S103, S106, S107).

On the other hand, the lower substrate 5 and the upper substrate 3 is made of a large area glass substrate. In other words, a plurality of panel regions are formed on a large area glass substrate, and a TFT and a color filter layer, which are driving elements, are formed in each of the panel regions. Must be processed (S108). Thereafter, the liquid crystal is injected into the liquid crystal panel processed as described above through the liquid crystal inlet, and the liquid crystal inlet is encapsulated to form a liquid crystal layer. .

The liquid crystal is injected through the liquid crystal inlet formed in the panel. At this time, the injection of the liquid crystal is made by the pressure difference. 3 shows an apparatus for injecting liquid crystal into the liquid crystal panel. As shown in FIG. 3, a container 12 filled with liquid crystal is provided in a vacuum chamber 10, and a liquid crystal panel 1 is positioned on an upper portion thereof. The vacuum chamber 10 is connected to a vacuum pump to maintain a set vacuum state. In addition, although not shown in the drawing, an apparatus for moving the liquid crystal panel is installed in the vacuum chamber 10 to move the liquid crystal panel 1 from the upper part of the container 12 to the container, and thus the injection hole 16 formed in the liquid crystal panel 1. ) Is brought into contact with the liquid crystal 14 (this method is referred to as a liquid crystal dipping injection method).

As described above, when nitrogen (N ₂ ) gas is supplied into the vacuum chamber 10 while the injection port 16 of the liquid crystal panel 1 is in contact with the liquid crystal 14, the vacuum degree of the chamber 10 is reduced. The liquid crystal 14 is injected into the panel 1 through the injection hole 16 by the pressure difference between the pressure inside the liquid crystal panel 1 and the vacuum chamber 10 and the liquid crystal is completely filled in the panel 1. The liquid crystal layer is formed by sealing the injection hole 16 with a sealing material (this method is called vacuum injection of liquid crystal).

However, the method of forming the liquid crystal layer by injecting liquid crystal through the injection hole 16 of the liquid crystal panel 1 in the vacuum chamber 10 as described above has the following problems.

First, the liquid crystal injection time to the panel 1 is long. In general, the distance between the driving element array substrate and the color filter substrate of the liquid crystal panel is very narrow, such as several μm, so that only a very small amount of liquid crystal is injected into the liquid crystal panel per unit time. For example, when manufacturing a liquid crystal panel of about 15 inches takes about 8 hours to completely inject the liquid crystal, the liquid crystal panel manufacturing process is lengthened by the long-term liquid crystal injection, the manufacturing efficiency is lowered.

Second, the liquid crystal consumption rate is high in the liquid crystal injection method as described above. Of the liquid crystals 14 filled in the container 12, the amount injected into the liquid crystal panel 1 is a very small amount. On the other hand, when exposed to the atmosphere or a specific gas, the liquid crystal not only deteriorates by reacting with the gas but also by impurities introduced by contact with the liquid crystal panel 1. Therefore, even when the liquid crystal 14 filled in the container 12 is injected into the plurality of liquid crystal panels 1, the liquid crystal 14 remaining after the injection must be discarded. This leads to an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object thereof is to provide a liquid crystal dropping apparatus for directly dropping liquid crystal onto a large-area glass substrate including at least one liquid crystal panel.

It is another object of the present invention to provide a liquid crystal dropping device in which the structure is simple and the manufacturing cost can be reduced by opening and closing the discharge hole of the needle sheet by vertically moving the needle by the magnetic force formed on the upper and lower parts of the needle.

In order to achieve the above object, the liquid crystal dropping apparatus according to the present invention is a liquid crystal filling means for filling the liquid crystal and supplying gas to the upper portion to apply pressure to the liquid crystal, and is mounted on the lower portion of the liquid crystal filling means and A needle sheet having a discharge hole for discharging liquid crystal, a needle inserted into the liquid crystal filling unit to be able to move up and down to contact the discharge hole, and moving up and down by a magnetic force generated in the upper and lower parts to open and close the discharge hole; A solenoid coil and a magnetic rod mounted on an upper portion of the needle to move the needle upward by applying a magnetic force to the upper portion of the needle, and a liquid crystal of the liquid crystal container mounted on the lower portion of the liquid crystal container on at least one panel. The dripping consists of a nozzle.

The end of the needle sheet or needle is made of a permanent magnetic material to generate a magnetic force in the lower portion of the needle, the needle sheet and the needle (or end) is coated with a fluorine resin film to prevent deterioration of the liquid crystal and at the same time damage the needle and the needle sheet Prevent it.

Since the magnetic force generated by the solenoid coil and the magnetic rod is larger than the magnetic force generated by the needle or the needle sheet, when the power is applied to the solenoid coil and the magnetic force is generated on the magnetic rod, the needle moves upwards and the needle is terminated when the power is applied. Alternatively, the needle descends at a high speed by the magnetic force of the needle sheet to close the discharge hole of the needle sheet.

1 is a cross-sectional view of a general liquid crystal display device.

2 is a flowchart showing a conventional method for manufacturing a liquid crystal display device.

3 is a view showing liquid crystal injection of a conventional liquid crystal display device.

4 is a view showing a liquid crystal display device manufactured by the liquid crystal dropping method according to the present invention.

5 is a flowchart illustrating a method of manufacturing a liquid crystal display device by the liquid crystal dropping method.

6 is a view showing a basic concept of the liquid crystal dropping method.

Figure 7 is a view showing the structure of the liquid crystal dropping apparatus according to the present invention, Figure 7 (a) is a view of the liquid crystal dropping and Figure 7 (b) is a view of the liquid crystal dropping.

8 is an exploded perspective view of FIG. 7;

Explanation of symbols on the main parts of the drawings

101: liquid crystal panel 103, 105: substrate

107: liquid crystal 120: liquid crystal dropping device

122: case 124: liquid crystal container

130: solenoid coil 132: magnetic rod

134: clearance adjustment unit 136: needle

143: needle seat 144: discharge hole

145: nozzle 146: outlet

In order to overcome the shortcomings of the conventional liquid crystal injection method such as the liquid crystal dipping method or the liquid crystal vacuum injection method, a method proposed in recent years is a liquid crystal layer forming method by the liquid crystal dropping method. The liquid crystal dropping method does not inject the liquid crystal by the pressure difference between the inside and the outside of the panel, but directly drops and dispenses the liquid crystal onto the substrate, and uniformly spreads the liquid crystal dropped by the bonding pressure of the panel. The liquid crystal layer is formed by distribution. Since the liquid crystal dropping method directly drops the liquid crystal onto the substrate for a short time, the liquid crystal layer formation of the large area liquid crystal display device can be performed very quickly, and only the required amount of liquid crystal is directly dropped onto the substrate. Since it is possible to minimize the consumption of the liquid crystal display device has the advantage that can significantly reduce the manufacturing cost.

4 is a view showing a basic concept of the liquid crystal dropping method. As shown in the figure, in the liquid crystal dropping method, before the lower substrate 105 and the upper substrate 103 on which the driving element and the color filter are formed, respectively, the liquid crystal 107 is droplet-shaped on the lower substrate 105. Dropping The liquid crystal 107 may be dropped on the substrate 103 on which the color filter is formed. In other words, the substrate to be the liquid crystal dropping method in the liquid crystal dropping method can be either a TFT substrate or a CF substrate. However, when the substrates are bonded, the substrate on which the liquid crystal is dropped must be placed at the bottom.

In this case, a sealing material 109 is applied to the outer region of the upper substrate 103 to apply pressure to the upper substrate 103 and the lower substrate 105 so that the upper substrate 103 and the lower substrate 105 are bonded together. At the same time, droplets of the liquid crystal 107 are spread out by the pressure to form a liquid crystal layer having a uniform thickness between the upper substrate 103 and the lower substrate 105. In other words, the biggest feature of the liquid crystal dropping method is that the liquid crystal 107 is previously dropped on the lower substrate before the panel 101 is bonded, and then the panel is bonded by the sealing material 109.

The method of manufacturing a liquid crystal display device using the liquid crystal dropping method has the following difference from the manufacturing method of the conventional liquid crystal injection method. In the conventional liquid crystal injection method, a large area glass substrate in which a plurality of panels are formed is separated into panel units, and liquid crystal is injected. In the liquid crystal drop method, a liquid crystal layer is formed by dropping a liquid crystal on a substrate in advance, and then a glass substrate is paneled. Processing can be separated in units.

The liquid crystal display device manufacturing method to which the above liquid crystal dropping method is applied is shown in FIG. 5. As shown in the figure, TFT and color filter layers, which are driving elements, are formed on the lower substrate 105 and the upper substrate 103 through the TFT array process and the color filter process (S201 and S202). The TFT array process and the color filter process are the same as those of the conventional manufacturing method shown in FIG. 2 and are collectively performed on a large-area glass substrate on which a plurality of panel regions are formed. In particular, since the liquid crystal dropping method is applied in the manufacturing method, it can be usefully used in a larger glass substrate, for example, a large area glass substrate having an area of 1000 × 1200 mm ² or more, compared with the conventional manufacturing method.

Subsequently, after the alignment layer is applied to the lower substrate 105 on which the TFT is formed and the upper substrate 103 on which the color filter layer is formed, rubbing is performed (S202 and S205), and the liquid crystal 107 is applied to the liquid crystal panel region of the lower substrate. Is added and the sealing material 109 is applied to the liquid crystal panel outer region of the upper substrate 103 (S203, S206).

Thereafter, pressure is applied while the upper substrate 103 and the lower substrate 105 are aligned, and the upper substrate 103 and the lower substrate 105 are bonded together by a sealing material and simultaneously dropped by application of pressure. The liquid crystal 107 is spread evenly over the entire panel (S207). Through this process, a plurality of liquid crystal panels having a liquid crystal layer are formed on glass substrates (lower substrates and upper substrates) having a large area. By inspecting, a liquid crystal display device is produced (S208, S209).

When comparing the difference between the manufacturing method of the liquid crystal display device to which the liquid crystal drop method shown in FIG. 5 is applied and the manufacturing method of the liquid crystal display device to which the conventional liquid crystal injection method shown in FIG. 2 is applied, the difference between the vacuum injection and the liquid crystal drop of the liquid crystal and In addition to the difference in the processing time of the large-area glass substrate, there are other differences. That is, in the method of manufacturing a liquid crystal display device to which the liquid crystal injection method shown in FIG. 2 is applied, the injection hole must be sealed by an encapsulant after the liquid crystal is injected through the injection hole. This eliminates the need for sealing of these inlets. In addition, although not shown in FIG. 2, in the manufacturing method to which the liquid crystal injection method is applied, since the substrate contacts the liquid crystal when the liquid crystal is injected, the outer surface of the panel is contaminated by the liquid crystal. In the manufacturing method in which the liquid crystal dropping method is applied, since the liquid crystal is directly dropped on the substrate, the panel is not contaminated by the liquid crystal, and as a result, the cleaning process is unnecessary. As described above, the manufacturing method of the liquid crystal display device by the liquid crystal dropping method is made of a simple process by the manufacturing method by the liquid crystal injection method, so that not only the manufacturing efficiency can be improved but also the yield can be improved.

In the manufacturing method of the liquid crystal display device in which the liquid crystal dropping method is introduced as described above, the most important factors for accurately forming the liquid crystal layer to a desired thickness are the position of the liquid crystal to be dropped and the amount of liquid crystal dropping. In particular, since the thickness of the liquid crystal layer has a close relationship with the cell gap of the liquid crystal panel, the accurate dropping position and the dropping amount of the liquid crystal are very important factors for preventing defects of the liquid crystal panel. Therefore, there is a need for a device for dropping the correct amount of liquid crystal at the correct position, the present invention provides such a liquid crystal dropping device.

6 is a view showing the basic concept of dropping the liquid crystal 107 on the substrate (large area glass substrate) 105 using the liquid crystal dropping apparatus 120 according to the present invention. As shown in the figure, the liquid crystal dropping device 120 is provided above the substrate 105. Although not shown in the drawing, the liquid crystal is filled in the liquid crystal dropping device 120 to fill a predetermined amount on the substrate.

Typically, the liquid crystal is dropped onto the substrate in the form of droplets. Since the substrate 105 moves at a set speed in the x and y directions, and the liquid crystal dropping device discharges the liquid crystal at a set time interval, the liquid crystal 107 dropped on the substrate 105 at regular intervals in the x and y directions. Is placed. Of course, the liquid crystal dropping substrate 105 may be fixed and the liquid crystal dropping apparatus 120 may move in the x and y directions to drop the liquid crystal at a predetermined interval. However, in this case, since the droplet-shaped liquid crystals are shaken by the movement of the liquid crystal dropping device 120, an error may occur in the dropping position and the dropping amount of the liquid crystal. Therefore, the liquid crystal dropping device 120 is fixed and the substrate 105 is moved. It is desirable to.

7 is a view showing a liquid crystal dropping apparatus according to the present invention, Figure 7 (a) is a cross-sectional view of the liquid crystal dropping, Figure 7 (b) is a cross-sectional view of the liquid crystal dropping, Figure 8 is an exploded perspective view of FIG. The liquid crystal dropping apparatus of the present invention will be described in detail with reference to the drawings.

As shown in the figure, in the liquid crystal dropping device, a cylindrical liquid crystal container 124 is accommodated in the case 122. The liquid crystal container 124 is made of polyethylene and the liquid crystal 107 is filled therein, and the case 122 is made of stainless steel so that the liquid crystal container 124 is formed therein. It is stored. In general, polyethylene is mainly used as the liquid crystal container 124 because it is easy to form a container having a desired shape because of its excellent moldability and does not react with the liquid crystal when the liquid crystal 107 is filled. However, since the polyethylene is weak in strength, it is easy to be deformed by a weak external shock. In particular, when polyethylene is used as the liquid crystal container 124, the container 124 may be deformed to drop the liquid crystal 107 in the correct position. Since it is not present, the case 122 is made of stainless steel having high strength. Although not shown in the drawings, a gas supply pipe connected to an external gas supply unit is formed at an upper portion of the liquid crystal container 124. The gas, such as nitrogen, is supplied from an external gas supply through the gas supply pipe, and the liquid crystal of the liquid crystal container 124 is filled with gas to apply pressure to the liquid crystal so that the liquid crystal is dropped.

An opening 123 is formed at the lower end of the case 122. When the liquid crystal container 124 is accommodated in the case 122, the protrusion 138 formed at the lower end of the liquid crystal container 124 is inserted into the opening 123 so that the liquid crystal container 124 is coupled to the case 122. Be sure to In addition, the protrusion 138 is coupled to the first coupling portion 141. As shown in the figure, a nut of the protrusion 138 is formed and a bolt is formed on one side of the first coupling portion 141, the protrusion 138 and the first coupling portion 141 by the nut and bolt. ) Is fastened.

A nut is formed at the other end of the first coupling part 141, and a bolt is formed at one end of the second coupling part 142 to fasten the first coupling part 141 and the second coupling part 142. . At this time, a needle sheet 143 made of a ferromagnetic material exhibiting permanent magnetism is positioned between the first coupling part 141 and the second coupling part 142. The needle seat 143 is inserted into the nut of the first coupling part 141 and the first coupling part 141 and the second coupling part 142 when the bolt of the second coupling part 142 is inserted and fastened. Are coupled between. A discharge hole 144 is formed in the needle sheet 143 so that the liquid crystal 107 filled in the liquid crystal container 124 is discharged through the discharge hole 144 via the coupling part 142.

In addition, the nozzle 145 is coupled to the second coupling portion 142. The nozzle 145 is for dropping a small amount of the liquid crystal 107 filled in the liquid crystal container 124, the second coupling portion 142 is fastened with a nut of one end of the second coupling portion (145) And a support 147 including a bolt to be coupled to the 142 and a discharge port 146 protruding from the support 147 to drop a small amount of liquid crystal onto the substrate in a drop shape.

A discharge pipe extending from the discharge hole 144 of the needle sheet 143 is formed in the support part 147, and the discharge pipe is connected to the discharge hole 146. Typically, the outlet 146 of the nozzle 145 has a very small diameter (to adjust the fine liquid crystal dropping amount) and protrudes from the support 147.

The needle 136 is inserted into the liquid crystal container 124 so that one end thereof contacts the needle sheet 143. In particular, since the end portion of the needle 136 in contact with the needle sheet 143 has a conical shape, the end portion is inserted into the discharge hole 144 of the needle sheet 143 to block the discharge hole 144. do.

Since the needle 136 is made of metal, the needle 136 is always firmly inserted (contacted) into the discharge hole 144 of the needle sheet 143 by the permanent magnetism of the needle sheet 143. At this time, the entire needle sheet 143 need not be formed of a magnetic material. The reason why the needle sheet 143 is formed of a magnetic material is to form a magnetic force so that the needle 136 made of metal firmly touches the discharge hole 144, so that the entire needle sheet 143 is not formed of the magnetic material. It will be possible to form only the discharge hole 144 region without the magnetic material.

The magnetic rod 132 having the gap adjusting unit 134 is mounted on the needle 136 located in the upper case 126 of the liquid crystal dropping device 120. The magnetic rod 132 is made of a ferromagnetic material or a soft magnetic material, the outside of the cylindrical solenoid coil 130 is installed. The solenoid coil 130 is connected to the power supply unit 150 and is supplied with power. As the power is applied, magnetic force is generated in the magnetic rod 132.

The needle 136 and the magnetic rod 132 are provided at regular intervals (x). When power is supplied from the power supply unit 150 to the solenoid coil 130 to generate a magnetic force on the magnetic rod 132, the needle 136 coupled by the magnetic force contacts the magnetic rod 132. When the power supply is interrupted, the needle 136 is restored to the original position (the position of closing the discharge hole 144) by the magnetic force of the needle sheet 134. The discharge hole 144 formed in the needle sheet 143 is opened or closed by the vertical movement of the needle 136.

In order to apply power to the solenoid coil 130 so that the discharge hole 144 is opened and closed, the magnetic force (electromagnetic force) formed in the magnetic rod 132 should be greater than the magnetic force formed in the needle sheet 134. If the magnetic force of the needle sheet 134 is greater than the magnetic force formed on the magnetic rod 132, the needle 136 does not move even when power is applied to the solenoid coil 130, and thus the needle sheet 143 The discharge hole 144 formed in the) will not be opened. Therefore, the magnetic force formed on the magnetic rod 132 should not only be larger than the magnetic force formed on the needle sheet 143, but also should be larger than the critical size.

As described above, in the liquid crystal dropping apparatus of the present invention, the dropping amount of the liquid crystal dropped on the substrate is controlled by controlling the movement of the needle 136 by the magnetic force generated in the upper and lower portions of the needle 136. At this time, the magnetic force below the needle 136 is not generated only by forming the needle 143 as a magnetic material. It is also possible to control the movement of the needle 136 by forming the end of the needle 136 to be inserted into the discharge hole 144 to a ferromagnetic material to generate a permanent magnetic force and to form the needle sheet 143 of a metal.

A fluororesin layer may be applied to the needle sheet 143 and the needle 136. In general, when the liquid crystal is in contact with the metal, the metal and the liquid crystal react chemically. This chemical reaction contaminates the liquid crystal. As a result, when the liquid crystal display device is manufactured, defects occur in the liquid crystal display device. This failure similarly occurs when the needle 136 is made of magnetic material. Accordingly, contamination of the liquid crystal may be prevented by applying a fluorine resin film having properties such as wear resistance, heat resistance, and chemical resistance to the surface of the needle 136 made of metal and / or magnetic material. In addition, as described above, since the fluorine resin has abrasion resistance, the needle 136 is formed by forming a fluorine resin film on the end portion of the needle 136 and the needle sheet 143 by a dipping method or a spray method. It is possible to prevent the damage caused by the continuous impact (continuous contact) of the end of the needle seat 143 and the needle. At this time, the fluorine resin film applied to the needle 136 may be applied only to the end of the needle 136, that is, the end contacting the needle sheet 143, or may be applied to the whole.

As shown in FIG. 7B, as power is applied to the solenoid coil 130, a magnetic force greater than the magnetic force of the needle sheet 143 or the needle 136 is generated in the magnetic rod 132 so that the needle sheet 143 Outlet hole 144 is opened. As the discharge hole 144 is opened, a gas (ie, nitrogen gas) supplied to the liquid crystal container 124 pressurizes the liquid crystal and drops of the liquid crystal 107 from the nozzle 145. At this time, the amount of the liquid crystal 107 is dropped depends on the time when the discharge hole 144 is opened and the pressure applied to the liquid crystal, the open time is the interval between the combined needle 136 and the magnetic rod 132 (x), the magnetic force of the magnetic rod 132 generated by the solenoid coil 130 and the magnetic force of the needle 136 or the needle sheet 143. The magnetic force of the magnetic rod 132 may be adjusted according to the number of windings of the solenoid coil 130 installed around the magnetic rod 132 or the size of the power applied to the solenoid coil 130, and the needle 136 and the magnetic rod ( The interval x of the 132 can be adjusted by the gap adjusting unit 134 provided at the end of the magnetic rod 132.

When the power applied to the solenoid coil 130 is cut off, the magnetic force of the magnetic rod 132 is lost. As a result, the needle 136 is lowered by the permanent magnetic force generated by the needle sheet 143 or the needle 136. The discharge hole 144 of the sheet 143 is closed to finish dropping the liquid crystal.

As described above, in the present invention, the vertical motion of the needle is controlled by the magnetic force generated above and below the needle to drop the liquid crystal onto the substrate. The biggest feature of this invention is that the liquid crystal is dropped on the substrate by operating by the vertical motion of the needle. That is, the present invention is not limited to the specific structure disclosed in the above description but illustrates one example. It is easy for anyone in the technical field of the present invention to manufacture a liquid crystal dropping device having a modified structure by using the characteristics of the present invention which controls the movement of the needle by the magnetic force generated in the upper and lower parts of the needle. The scope of the present invention is not limited to the above-described liquid crystal dropping device of a specific structure but will include a liquid crystal dropping device of various structures.

As described above, in the liquid crystal dropping apparatus of the present invention, the lower end of the needle or the needle sheet is formed of a material having permanent magnetism, and a magnetic rod generating magnetic force by a solenoid coil is installed on the upper portion of the liquid crystal dropping device so as to be applied to the magnetic force generated at the upper and lower portions. The liquid crystal is dropped on the substrate by controlling the movement of the needle. Therefore, not only the structure is simple but also manufacturing cost can be reduced. In addition, in the present invention, by coating the fluorine resin film on the needle and the needle sheet, not only can the liquid crystal react with the metal deteriorate but also prevent damage caused by continuous contact of the needle and the needle sheet.

Claims (10)

Liquid crystal filling means for filling a liquid crystal and supplying gas to the upper portion to apply pressure to the liquid crystal; A needle sheet mounted below the liquid crystal filling unit and having a discharge hole through which liquid crystals of the liquid crystal filling unit are discharged; A needle inserted into the liquid crystal filling means to move upward and downward to contact the discharge hole and open and close the discharge hole by vertically moving by a magnetic force generated in the upper and lower parts; A solenoid coil and a magnetic rod mounted on the needle and moving the needle upward by applying a magnetic force to the top of the needle; And And a nozzle mounted on the lower portion of the liquid crystal filling means and configured to drop the liquid crystal of the liquid crystal container onto a substrate including at least one panel. The liquid crystal dropping apparatus of claim 1, wherein the magnetic force generated in the upper portion of the needle is greater than the magnetic force generated in the lower portion of the needle. The liquid crystal dropping apparatus of claim 1, wherein an end portion of the needle contacting the discharge hole of the needle sheet is made of a permanent magnetic material. The liquid crystal dropping apparatus of claim 1, wherein the needle sheet is made of a permanent magnetic material. 5. The liquid crystal dropping apparatus according to claim 4, wherein the discharge hole of the needle sheet is made of a permanent magnetic material. The liquid crystal dropping apparatus according to claim 1, wherein the needle is coated with a fluorine resin film. 7. The liquid crystal dropping apparatus according to claim 6, wherein a fluororesin film is applied to an end portion of the needle in contact with the needle sheet. The liquid crystal dropping apparatus according to claim 1, wherein the needle sheet is coated with a fluorine resin film. The liquid crystal dropping apparatus according to claim 1, wherein the liquid crystal filling means is a liquid crystal container made of a metal. The liquid crystal filling device of claim 1, wherein the liquid crystal filling means comprises: a liquid crystal container filling liquid crystal and supplying gas to the upper portion to apply pressure to the liquid crystal; And Liquid crystal dropping device, characterized in that made of a case that accommodates the liquid crystal container.