KR20170135547A - Method of manufacturing liquid crystal display panel and coating device for manufacturing the same - Google Patents

Abstract

The present invention relates to a method and a coating apparatus for manufacturing a liquid crystal panel. The method for manufacturing a liquid crystal panel according to an embodiment of the present invention comprises the steps of: fixing a liquid crystal display panel on a lower stage; disposing an upper stage on the liquid crystal display panel; spraying coating composition on a side surface of the liquid crystal display panel exposed between the upper stage and the lower stage; and curing the coating composition to form a protective layer. Therefore, moisture penetration in an upper polarizing plate and a separation phenomenon between the upper polarizing plate and an upper substrate are suppressed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a liquid crystal display panel, and a coating apparatus for manufacturing a liquid crystal display panel.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display panel and a coating apparatus for manufacturing a liquid crystal display panel, and more particularly, to a liquid crystal display panel capable of forming a protective layer having a uniform thickness, And a coating apparatus for manufacturing a liquid crystal display panel.

2. Description of the Related Art A liquid crystal display (LCD) is a display device that implements an image by controlling a light transmittance of a light source by controlling the arrangement of liquid crystals by applying an electric field to the liquid crystal , Smart phones and tablet PCs.

A liquid crystal display device includes a liquid crystal display panel disposed on a backlight unit including a light source. A liquid crystal display panel includes a lower substrate including a thin film transistor (TFT) and an upper substrate including a color filter, and a liquid crystal interposed between the lower substrate and the upper substrate to determine whether light is transmitted as an electrical signal is applied . The liquid crystal display panel has a polarizing plate for controlling the polarization direction of light. Specifically, an upper polarizer is disposed on the upper substrate, and a lower polarizer is disposed below the lower substrate.

On the other hand, typical polarizing plates include polyvinyl alcohol (PVA) polarizers. However, PVA-based polarizers are susceptible to moisture, so that polarizers containing PVA-based polarizers easily shrink when they come in contact with moisture or when the ambient humidity is high. As a result, a curl phenomenon in which the liquid crystal display panel is warped may occur severely.

In particular, unlike the lower polarizer plate which is protected by the lower case that protects and accommodates the liquid crystal display panel, the upper polarizer plate is exposed to the upper side, and thus is easily affected by the external environment. Accordingly, when the upper polarizer is exposed to moisture, the upper polarizer is delaminated from the upper substrate. As a result, there arises a problem that light leakage phenomenon and color deviation occur, and as a result, it becomes difficult to maintain a uniform quality throughout the entire area of the liquid crystal display panel.

Accordingly, the inventors of the present invention considered forming a separate protective layer on the side surface of the liquid crystal display panel in order to suppress moisture penetration into the upper polarizer and peeling between the upper polarizer and the upper substrate.

In order to suppress the shape of a light leakage leaked between an upper substrate and a lower substrate in a conventional liquid crystal display panel or a shape of a light leakage leaked from a backlight unit into a liquid crystal display panel and a lower case, Was used. Conventionally, a pad printing method is used to form such a light shielding layer. To further illustrate this, reference is made to Figures 1A and 1B.

FIG. 1A is a schematic cross-sectional view for explaining a conventional method of manufacturing a liquid crystal display panel, and FIG. 1B is a schematic cross-sectional view for explaining a conventional liquid crystal display panel. 1A and 1B, a liquid crystal display panel 100 includes an upper substrate 110, a lower substrate 120, an upper polarizer 130 disposed on the upper substrate 110, A lower polarizer plate 140 and a light shielding layer 150 disposed thereon.

The light shielding layer 150 may be formed using a pad 160 to suppress light leakage occurring on the side surface of the liquid crystal display panel 100. First, the ink containing the light shielding agent is filled on the surface of the pad 160, and then the ink is transferred by pressing the pad 160 on the side surface of the liquid crystal display panel 100 where the light shielding layer is to be disposed. Then, the light shielding layer 150 is formed on the side surface of the liquid crystal display panel 100 through a curing process.

1B, when a protective layer such as the light-shielding layer 150 is formed on the side surface of the liquid crystal display panel 100 using the pad printing method as described above, the ink 150 ' And the ink 150 'is transferred to the side surface of the liquid crystal display panel 100, the uniformity of application of the ink 150' may be reduced. If the coating layer is formed non-uniformly, a defective light may appear as if the coating layer is shiny at an angle. If the application of the ink 150 'is mistaken, the ink 150' transferred to the liquid crystal display panel 100 must be wiped off, and then the pad printing process must be performed again.

Further, when the pad printing method is used, it becomes difficult to form a coating layer having a sufficient thickness. That is, when the pad printing method is used, it is difficult to obtain a thickness of 10 μm or more in general. In the case of the light-shielding layer 150 described with reference to FIGS. 1A and 1B, since the light shielding effect can be obtained even with a small thickness of about 5 μm, there is no problem in forming the light-shielding layer 150 using the pad printing method. However, when a protective layer is formed to prevent water penetrating the upper polarizer 130 and to suppress peeling of the upper polarizer 130, a sufficient thickness of 20 μm or more is required to suppress moisture penetration. Therefore, it is impossible to form the protective layer by the pad printing method.

The inventors of the present invention have invented a method of manufacturing a liquid crystal display panel in which a protective layer is formed on the side surface of a liquid crystal display panel by using a spray method to form a protective layer having a uniform thickness and a sufficient thickness.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a liquid crystal display device capable of forming a protective layer having a sufficient thickness to suppress moisture penetration into an upper polarizing plate by spraying a coating composition on a side surface of a liquid crystal display panel, And a method of manufacturing the panel.

Another problem to be solved by the present invention is to provide a liquid crystal display panel in which a spray nozzle for spraying a coating composition maintains a certain gap from the liquid crystal display panel and forms a protective layer while moving at a constant speed along a side surface of the liquid crystal display panel, And to provide a method of manufacturing a liquid crystal display panel capable of forming a layer.

Another object of the present invention is to provide a method of manufacturing a liquid crystal display panel having excellent workability.

It is another object of the present invention to provide a coating apparatus for manufacturing a liquid crystal display panel which is capable of forming a protective layer having excellent uniformity on the side surface of a liquid crystal display panel and having a sufficient thickness.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display panel including a top substrate, a bottom substrate and an upper polarizer on the top substrate, Fixing the display panel; Disposing an upper stage on the liquid crystal display panel; Spraying the coating composition on the side of the liquid crystal display panel exposed between the upper stage and the lower stage; And curing the coating composition to form a protective layer.

A method of manufacturing a liquid crystal display panel according to another embodiment of the present invention is a method of protecting a side surface of an upper polarizer from moisture penetration and protecting the interface between an upper substrate and an upper polarizer using spray to suppress lifting and discoloration of the upper polarizer, To form a layer.

An apparatus for manufacturing a liquid crystal display panel according to an embodiment of the present invention includes a lower stage for fixing a liquid crystal display panel; An upper stage for covering the upper surface of the liquid crystal display panel; An arm having a plurality of body portions and a plurality of joint portions so as to be movable along a side surface of the liquid crystal display panel; A spray nozzle arranged at one end of the arm and configured to spray a coating composition on a side surface of the liquid crystal display panel; And a control unit for controlling the moving speed of the spray nozzle, the distance between the spray nozzle and the side surface of the liquid crystal display panel, the vertical height of the spray nozzle, and the injection amount.

The details of other embodiments are included in the detailed description and drawings.

The present invention has an effect of forming a protective layer having a sufficient thickness so that moisture penetration into the upper polarizer can be suppressed by using a continuous spray process.

The present invention can form a protective layer having excellent uniformity by spraying the coating composition while moving at a constant speed along the side surface of the liquid crystal display panel while keeping the spray nozzle for spraying the coating composition at a predetermined distance from the liquid crystal display panel , Thereby minimizing the problem that the coating layer shines according to the angle.

The present invention has an effect that workability is improved when a protective layer is formed on a side surface of a liquid crystal display panel.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1A is a schematic cross-sectional view for explaining a conventional method of manufacturing a liquid crystal display panel.
1B is a schematic cross-sectional view for explaining a conventional liquid crystal display panel.
2 is a schematic perspective view illustrating a coating apparatus for a liquid crystal display panel capable of implementing a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.
3 is a flowchart illustrating a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.
4A to 4I are schematic views for sequentially illustrating a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.
5A and 5B are schematic cross-sectional views illustrating a liquid crystal display panel manufactured by a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

An element or layer is referred to as being another element or layer "on ", including both intervening layers or other elements directly on or in between.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

2 is a schematic perspective view illustrating a coating apparatus for a liquid crystal display panel capable of implementing a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.

The coating apparatus 200 for a liquid crystal display panel for manufacturing a liquid crystal display panel includes a lower stage 210, a rotation table 220, an upper stage 230, a main body 240, an arm 250, a spray nozzle 260 And a control unit.

The lower stage 210 supports and fixes the liquid crystal display panel as the workpiece. The size of the lower stage 210 may be equal to or less than the size of the liquid crystal display panel so that the coating composition applied to the side surface of the liquid crystal display panel may flow down. The lower stage 210 may have a plane having the same shape as the liquid crystal display panel. Further, the lower stage 210 may be made of metal. For example, the lower stage 210 may be made of aluminum.

The lower stage 210 can be connected to a suction device that can be fixed by suctioning a liquid crystal display panel disposed on the upper side. The liquid crystal display panel can be firmly fixed to the lower stage 210 through the suction device so that the movement of the liquid crystal display panel can be minimized while the lower stage 210 moves or the coating composition is sprayed.

In addition, the lower stage 210 may include a laser sensor capable of measuring size and position information of the liquid crystal display panel. The size and position information of the liquid crystal display panel measured by the laser sensor is transmitted to the control unit, and the coating composition can be precisely and uniformly sprayed on the basis of the information.

In the applicator 200, the lower stage 210 may be composed of two or more sub-lower stages. Referring to FIG. 2, the lower stage 210 includes a first sub-lower stage 211 and a second sub-lower stage 212. A liquid crystal display panel may be disposed on the first sub-lower stage 211, and then another liquid crystal display panel may be disposed on the second sub-lower stage 212 during the coating process, thereby preparing a next coating process. That is, when the application process is completed on the liquid crystal display panel on the first sub-lower stage 211, the first sub-lower stage 211 moves outward from the work space where the spray nozzles 260 are located, The lower stage 212 can be moved to the work space. Here, the work space means the inside of the movable range of the spray nozzle 260 for spraying the coating composition, and means the space where the side of the liquid crystal display panel can be applied by the spray nozzle 260. At this time, the first sub-lower stage 211 and the second sub-lower stage 212 may be disposed on the rotary table 220 that performs a rotational movement in the xy plane in the horizontal direction. The first sub-lower stage 211 and the second sub-lower stage 212 may be alternately located in the work space in accordance with the rotation of the rotary table 220. [

The upper stage 230 covers a liquid crystal display panel disposed on the lower stage 210. The upper stage 230 is positioned in the vertical direction (z-axis direction) before the application process is performed, and when the lower stage 210 and the liquid crystal display panel are located in the work space, the upper stage 230 rotates 90 degrees about the x- . At this time, the upper stage 230 faces the lower stage 210 while centering the liquid crystal display panel.

The upper stage 230 may have a plane having the same shape as the liquid crystal display panel. Further, the upper stage 230 may be made of metal. For example, the upper stage 230 may be made of aluminum.

The arm 250 regulates the position of the spray nozzle 260 so that the spray nozzle 260 can spray the coating composition to the side of the liquid crystal display panel. One end of the arm 250 is connected to the fixed body 240, and the other end is connected to the spray nozzle 260.

The arm 250 includes a plurality of body portions 251 and 252 and a plurality of joint portions 253, 254, 255, and 256 for moving the spray nozzle 260. Specifically, the arm 250 includes a first body portion 251, a second body portion 252, a first joint portion 253, a second joint portion 254, a third joint portion 255, a fourth joint portion 256 And a nozzle moving unit 257. The nozzle moving unit 257 moves the nozzle moving unit 257 to a predetermined position.

The first body part 251 and the second body part 252 are connected to the nozzle spray 260 and rotate in the horizontal direction (x-y axis direction). Specifically, one end of the first body part 251 is connected to the body 240 of the application device 200 so that the first joint part 253 can rotate on the X-Y plane in a horizontal direction by the first joint part 253. The other end of the first body part 251 is connected to the second body part 252 by the second joint part 254. One end of the second body part 252 is connected to the other end of the first body part 251 so that the second body part 252 can rotate on the X-Y plane in the horizontal direction by the second joint part 254. The other end of the second body part 252 is connected to the spray nozzle 260 by the third joint part 255 and the fourth joint part 256. The movement radius of the first body portion 251 and the second body portion 252 and the angle between the first body portion 251 and the second body portion 252 are adjusted to move the spray nozzle 260 to a desired position .

The plurality of joint parts 253, 254, 255, and 256 include joints that move the spray nozzle 260 while maintaining a constant gap with the side surface of the liquid crystal display panel, and joints that change the vertical position of the spray nozzle 260. More specifically, the first joint part 253 connects the first body part 251 and the body 240 of the application device 200 and rotates the first body part 251 in the horizontal direction on the XY plane . The second joint part 254 is configured to connect the second body part 252 and the first body part 251 and to rotate the second body part 252 in the horizontal direction on the XY plane. The third joint part 255 connects the nozzle moving part 257 connecting the spray nozzle 260 with the arm 250 and the second body part 252 and moves the nozzle moving part 257 in the vertical direction . That is, the vertical height of the spray nozzle 260 can be adjusted through the movement of the third joint part 255. The fourth joint part 256 connects the nozzle mounting part 270 to connect the nozzle moving part 257 and the spray nozzle 260 or fix the position of the nozzle moving part 257 and the spray nozzle 260, And is configured to rotate the spray nozzle 260 in an XY plane in a horizontal direction. That is, the spray nozzle 260 can be moved along the side surface of the liquid crystal display panel through the movement of the fourth joint 256 to spray the coating composition.

The first joint part 253, the second joint part 254, the third joint part 255 and the fourth joint part 256 may be composed of an electric motor or a hydraulic motor, but the present invention is not limited thereto.

The spray nozzle 260 is connected to a nozzle connection part 257 connected to one end of the arm 250 and moves along the side surface of the liquid crystal display panel to spray the coating composition on the side surface of the liquid crystal display panel. The spray nozzle 260 can adjust the injection speed and the injection amount. A spray nozzle 260 is connected to the coating tubing to receive the coating composition from the storage tank.

The application device 200 may further include a nozzle mounting portion 270 for fixing the position of the spray nozzle 260. [ The nozzle mounting portion 270 connects the nozzle moving portion 257 and the spray nozzle 260. The nozzle mounting portion 270 includes a portion configured to mount a syringe, a nozzle holder, etc., to which the spray nozzle 260 is coupled or connected. Further, the spray nozzle 260 may include an ultrasonic generator or a heater that generates ultrasonic vibration to suppress the clogging of the coating composition and clogging of the discharge port.

The control unit controls the application process based on information of the liquid crystal display panel previously input or information of the liquid crystal display panel measured through the sensor. More specifically, the control unit controls the injection amount, the injection pressure, and the like of the coating composition injected from the spray nozzle 260 and controls the respective joints constituting the arm 250 to control the moving speed of the spray nozzle 260, The distance between the liquid crystal display panel 260 and the side surface of the liquid crystal display panel, the vertical height of the spray nozzle 260, and the like.

Hereinafter, referring to FIG. 3 and FIGS. 4A to 4I together to describe the method of manufacturing a liquid crystal display panel using the coating device 200 for a liquid crystal display panel as described above in detail.

3 is a flowchart illustrating a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention. 4A to 4I are schematic views for sequentially illustrating a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.

Referring to FIG. 3, a method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention includes fixing a liquid crystal display panel on a lower stage (S310). Reference is made to Fig. 4A to describe in more detail the fixing of the liquid crystal display panel on the lower stage.

4A is a schematic perspective view illustrating a structure in which a liquid crystal display panel is fixed to an upper portion of a lower stage.

Referring to FIG. 4A, a liquid crystal display panel 400 is disposed on the first sub-lower stage 211. The liquid crystal display panel 400 refers to a panel in which a lower polarizer, a lower substrate, an upper substrate, an upper polarizer, and a protective film are sequentially stacked in a previous process.

Subsequently, the liquid crystal display panel 400 is aligned on the first sub-lower stage 211. By properly aligning the liquid crystal display panel 400 on the first sub-lower stage 211, application of the coating composition can be uniformly performed in a subsequent process.

Thereafter, the first sub-lower stage 211 sucks the liquid crystal display panel 400 through the suction device to fix the liquid crystal display panel 400 so as not to move during the application process.

In addition, the size information and the position information are measured through the laser sensor in the liquid crystal display panel 400 disposed on the first sub-lower stage 211. At this time, the measured information is transmitted to the control unit and utilized to control the process conditions in the step of spraying the coating composition to form a protective layer on the side surface of the liquid crystal display panel (400).

Subsequently, the liquid crystal display panel is moved into the work space (S320). See FIG. 4B for a more detailed description.

4B is a schematic plan view for explaining a process of moving the liquid crystal display panel into the work space in order to spray the coating composition on the liquid crystal display panel.

4B, after the liquid crystal display panel 400 is fixed on the first sub-lower stage 211, the liquid crystal display panel 400 and the first sub- Move to the workspace to be performed. The liquid crystal display panel 400 is fixed on the first sub-lower stage 211 outside the work space, and then is moved into the work space from outside the work space by the rotation of the rotation table 220. At the same time, the second sub-lower stage 212 inside the work space is moved out of the work space. However, in the manufacturing method according to the embodiment of the present invention, the liquid crystal display panel 400 is moved to the work space through a separate step. However, if necessary, the lower stage 210, The liquid crystal display panel 400 may be directly fixed to the lower stage 210 existing in the work space in the step S310 of fixing the liquid crystal display panel 400 on the work space.

Subsequently, an upper stage is disposed on the liquid crystal display panel (S330). Reference is made to Fig. 4C to describe in more detail the structure in which the upper stage is arranged on the liquid crystal display panel.

4C is a schematic cross-sectional view for explaining a structure in which an upper stage and a lower stage are arranged in a liquid crystal display panel.

Referring to FIG. 4C, the liquid crystal display panel 400 includes a lower polarizer 440, a lower substrate 420, an upper substrate 410, an upper polarizer 430, and a protective film 450. At this time, the lower stage 210 is disposed in contact with the lower portion of the liquid crystal display panel 400, and the upper stage 230 is disposed in contact with the upper portion of the liquid crystal display panel 400.

The lower polarizer 440 and the upper polarizer 430 polarize the light. For example, the lower polarizer 440 polarizes light emitted from the backlight unit and provides the polarized light to the lower substrate 420. The upper polarizer 430 polarizes the light that has passed through the upper substrate 410 and emits the polarized light onto the liquid crystal display panel 400. The lower polarizer plate 440 and the upper polarizer plate 430 may be composed of a polarizer made of PVA (polyvinyl alcohol), an adhesive, or the like.

The lower substrate 420 supports various components constituting the liquid crystal display panel 400. The lower substrate 420 includes a thin film transistor (TFT), a pixel electrode electrically connected to the thin film transistor, A common electrode capable of forming an electric field with the pixel electrode is disposed. Thus, the lower substrate 420 may be referred to as a thin film transistor substrate. The thin film transistor forms an electric field between the pixel electrode and the common electrode based on the driving signal transmitted through the wiring.

The upper substrate 410 is opposed to the lower substrate 420. The upper substrate 410 may be referred to as a color filter substrate as a substrate for supporting a color filter layer. The color filter layer selectively transmits light of a specific wavelength. A full color image is displayed through the color filter layer.

A liquid crystal layer is disposed between the upper substrate 410 and the lower substrate 420. The liquid crystal of the liquid crystal layer is arranged in a predetermined direction, and the arrangement of the liquid crystal can be changed based on the electric field between the pixel electrode and the common electrode. As the arrangement of the liquid crystal is changed, the transmittance of the light emitted from the backlight unit can be controlled, and the light transmitted through the liquid crystal is emitted to the active region of the liquid crystal display panel 400.

The protective film 450 is disposed on the upper polarizer 430. The protective film 450 is a film for protecting the upper polarizer 430. As the protective film 450, a polymer film excellent in optical transparency, mechanical strength, thermal stability and the like can be used. For example, the protective film 450 may be made of TAC (triacetyl cellulose), but is not limited thereto. The protective film 450 may be a film laminated separately to protect the upper polarizer 430 or may be a film included in the upper polarizer 430 to protect the upper polarizer 430. The protective film 450 may not be included in the liquid crystal display panel 400 if necessary.

The upper stage 230 is disposed above the liquid crystal display panel 400 disposed on the lower stage 210. The upper stage 230 is arranged in the vertical direction (z-axis direction) before the liquid crystal display panel 400 is moved to the work space. When the lower stage 210 and the liquid crystal display panel 400 are positioned in the work space and is rotated 90 ° with respect to the x-axis to be brought into close contact with the upper surface of the liquid crystal display panel 400. The upper stage 230 may be configured to contact the liquid crystal display panel 400 such that the sprayed coating composition is not applied on the liquid crystal display panel 400 in the step of spraying the coating composition on the side surface of the liquid crystal display panel 400 . That is, the upper stage 230 not only fixes the display panel but also inhibits the coating composition from moving toward the center of the liquid crystal display panel 400.

On the other hand, the upper end of the upper stage 230 may be aligned with the upper end of the upper polarizer 430 of the liquid crystal display panel. Thus, only the side of the liquid crystal display panel is exposed to the outside, and then the coating composition sprayed from the spray nozzle 260 can be applied only to the side surface of the liquid crystal display panel. However, the structure is not limited to the structure in which the end of the upper stage 230 is aligned with the end of the upper polarizer 430. 4C, in the case of the liquid crystal display panel 400 in which the protective film 450 is disposed on the upper polarizer 430, the upper end of the upper stage 230 is connected to the upper polarizer 430, As shown in FIG. Since the end of the upper stage 230 does not coincide with the end of the upper polarizer 430 and some of the coating composition is sprayed on the side of the liquid crystal display panel 400 on the side of the liquid crystal display panel 400 It is possible to form the protective layer only on the side surface of the liquid crystal display panel 400 by removing the protective film 450 in a later step.

Subsequently, the coating composition is sprayed on the side of the liquid crystal display panel exposed between the upper stage and the lower stage (S340). Reference is made to Figures 4d-4g to describe the process of spraying the coating composition in more detail.

4D is a schematic cross-sectional view for explaining a process of spraying a coating composition on a side surface of a liquid crystal display panel using a spraying method.

Referring to FIG. 4D, the coating composition is sprayed onto the side surface of the liquid crystal display panel 400 exposed between the upper stage 230 and the first sub-lower stage 211 through the spray nozzle 260.

The position at which the coating composition is sprayed may vary depending on the use of the protective layer and the type of coating composition. For example, in the case of forming a protective layer for preventing water penetration into the upper polarizer 430 and suppressing lifting of the upper polarizer 430, the protective film 450 may be formed on the side of the upper polarizer 430 or the protective film 450 The coating composition may be sprayed. When the coating composition is sprayed toward the side surface of the liquid crystal display panel 400 using the spray nozzle 260, due to the jetting pressure, the sprayed coating composition spreads on the side of the liquid crystal display panel 400, (400). At this time, the coating composition may be applied to the side surface of the liquid crystal display panel 400 by flowing the sprayed coating composition downward by gravity.

The angle? ₁ and the ejection distance d _{1 in} the vertical direction (z-axis direction) between the spray nozzle 260 and the liquid crystal display panel 400 vary depending on the structure and shape of the protective layer to be formed And may be variously adjusted depending on the composition of the coating composition.

More specifically, the angle? _{1 in} the vertical direction (z-axis direction) formed by the upper polarizer plate 430 and the spray nozzle 260 may be 35 ° to 55 °. When the angle θ ₁ formed by the upper polarizer 430 and the spray nozzle 260 is less than 35 °, the coating composition tends to bounce due to the repulsive force depending on the injection pressure, and the coating composition is over coated The uniformity of the applied coating composition may be lowered. When the angle? _{1 in} the vertical direction formed by the upper polarizer 430 and the spray nozzle 260 is greater than 55 degrees, it is difficult to precisely inject the liquid crystal, so that it may be difficult to form a protective layer in a desired shape and position. In the method of manufacturing a liquid crystal display panel according to an embodiment of the present invention, the angle? _{1 in} the vertical direction formed by the upper polarizer 430 and the spray nozzle 260 may be 45 °, ₁ ) may be about 10 mm. However, the angle? _{1 in} the vertical direction formed by the upper polarizer 430 and the spray nozzle 260 is not limited to the above range.

Meanwhile, the coating composition used in the method of manufacturing a liquid crystal display panel according to an embodiment of the present invention may use other materials depending on the use of the protective layer and the curing method. For example, in the case of forming a protective layer functioning as a light-shielding layer, the coating composition may be a thermosetting resin composition containing a light shielding agent, and a protective layer for suppressing moisture penetration into the upper polarizer 430 When formed, it may be a UV curable resin composition having a multi-functional group.

The step S340 of spraying the coating composition on the side surface of the liquid crystal display panel 400 may be performed by moving a spray nozzle 260 for spraying the coating composition along the side surface of the liquid crystal display panel 400. [ Reference is made to Figs. 4E to 4G to describe in more detail the process of moving and spraying the spray nozzle 260. Fig.

4E to 4G are schematic plan views showing the movement of the spray nozzle in the step of spraying the coating composition on the side surface of the liquid crystal display panel.

Referring to FIG. 4E, the spray nozzle 260 moves from one end to the other end of one side of the liquid crystal display panel 400 and ejects the coating composition. The spray nozzle 260 is connected to the arm 250, which includes a plurality of body portions and joints, and is adjusted in position. The controller controls the position of the spray nozzle 260 by moving the arm 250 based on the size information and the position information of the liquid crystal display panel 400 and injects the coating composition.

Specifically, the spray nozzle 260 is moved from the end of the left side surface 400a adjacent to the upper side to the end of the left side surface 400a adjacent to the lower side surface 400b to spray the coating composition on the left side surface 400a do. At this time, the spray nozzle 260 moves at a constant speed while maintaining a constant distance d ₂ from the left side surface 400a along the left side surface 400a. The coating composition can be uniformly applied to the side surface of the liquid crystal display panel 400 to a constant thickness by spraying the coating composition while keeping the spray nozzle 260 at a constant spacing d ₂ and a constant speed. At this time, the horizontal angle? ₂ formed by the spray nozzle 260 and the liquid crystal display panel 400 may be vertical. Although not limited thereto, when the horizontal angle? ₂ formed by the spray nozzle 260 and the liquid crystal display panel 400 is vertical, the coating composition can be applied at the correct position, and as a result, A protective layer can be formed.

Referring to FIG. 4F, the spray nozzle 260 sprays the coating composition along the edge between the left side 400a and the lower side 400b of the liquid crystal display panel 400. At this time, the spray nozzle 260 ejects the coating composition to the edge portion while maintaining a certain distance from the liquid crystal display panel 400 by the arm 250. At this time, when the corner has a round shape, the spray nozzle 260 can move the edge at a constant speed while rotating on the xy plane in the horizontal direction by rotation of the fourth joint part 256 of the arm 250 . 4E, the spray nozzle 260 can move while maintaining an angle perpendicular to the tangent of the corner of the liquid crystal display panel 400 in the horizontal direction.

4G, the spray nozzle 260 moves from the end of the lower side 400b adjacent to the left side 400a to the end of the lower side 400b adjacent to the right side 400c, Lt; / RTI >

4E through 4G, in the method of manufacturing a liquid crystal display panel according to an embodiment of the present invention, the spray nozzle 260 is moved from one side by using the arm 250 including a plurality of joints The coating composition is continuously sprayed. That is, the spray nozzle 260 sequentially moves from the left side 400a to the right side 400c and the lower side 400b successively, and moves at a constant distance (d ₃ ) and at a constant speed, Can be applied. 4E to 4G, the spray nozzle 260 moves from the left side 400a toward the lower side 400b, but the present invention is not limited thereto. That is, depending on the design, the coating composition can be continuously sprayed in various directions starting from the right side 400c or the upper side 400d.

Meanwhile, in the step of spraying the coating composition, the injection amount of the coating composition dispersed from the spray nozzle 260 or the moving speed of the spray nozzle 260 may be adjusted to control the thickness of the coating composition applied to the side surface of the liquid crystal display panel 400, The thickness of the coating layer can be adjusted. Though not limited thereto, the thickness of the coating composition sprayed on the side surface of the liquid crystal display panel 400 may be 20 탆 to 100 탆. In order to prevent moisture from penetrating into the side surface of the upper polarizer 430, a thickness of 20 mu m or more is required. Considering that the applied coating composition has a reduced thickness through the curing process, when the thickness of the coating composition sprayed on the side surface of the liquid crystal display panel 400 satisfies the above-described range, a protective layer having excellent water permeation performance is obtained can do.

At this time, the step of spraying the coating composition (S330) includes a step of measuring the distance between the side surface of the liquid crystal display panel 400 and the spray nozzle 260 so that the spray nozzle 260 can be moved at regular intervals .

In order to form a uniform protective layer, the spray nozzle 260 moves along the side surface of the liquid crystal display panel 400 while maintaining a constant speed and a constant gap. To this end, the application device according to an embodiment of the present invention may include a sensor for measuring the distance between the spray nozzle 260 and the side surface of the liquid crystal display panel 400, near the spray nozzle 260. Such a sensor measures the distance between the spray nozzle 260 and the side surface of the liquid crystal display panel 400 in real time during the spraying process of the coating composition and transmits the measured distance to the controller so that the spray nozzle 260 is constantly in contact with the liquid crystal display panel 400 So that the coating composition can be sprayed while maintaining the gap.

The step S340 of spraying the coating composition is completed, and the liquid crystal display panel coated with the coating composition on the side moves out of the work space (S350). The step of moving the liquid crystal display panel 400 out of the work space is performed in a manner similar to that described in step S320. That is, the liquid crystal display panel 400 coated with the coating composition on the side surface of the liquid crystal display panel 400 is moved to the outside of the working space inside the working space by the rotation of the rotating table 220 together with the first sub- . At the same time, the second sub-lower stage 212 and the other liquid crystal display panel 400 disposed on the second sub-lower stage 212 existing outside the work space are moved into the work space.

The coating composition is then cured to form a protective layer (S360). When the coating composition coated on the liquid crystal display panel 400 is a UV curable composition, UV curing is performed, and when the coating composition is a thermosetting composition, thermal curing is performed. If the coating composition is a UV cured material, refer to Figure 4h for a more detailed description.

Figure 4h is a schematic cross-sectional view to illustrate the process of UV curing the coating composition.

Referring to FIG. 4H, in the liquid crystal display panel 400 moved out of the work space through step S350, a protective layer is formed by curing the UV curable coating composition by irradiating UV to the applied coating composition 460 ' .

The protective film is then removed. 4I is a schematic cross-sectional view for explaining a liquid crystal display panel in which a protective layer is formed after removing a protective film.

Referring to FIG. 4I, a protective layer 460 is formed by UV irradiation, and then the protective film 450 is removed from the liquid crystal display panel 400. A protective layer 460 covering the side surfaces of the upper polarizer 430, the side surfaces of the upper substrate 410, and the side surfaces of the lower substrate 420 is formed. Since the protective layer 460 has a structure covering the side surface of the upper polarizer 430, it is possible to suppress the penetration of moisture into the upper polarizer 430, and at the same time, to cover the boundary between the upper polarizer 430 and the upper substrate 410 Structure, the upper polarizer 430 can be prevented from being peeled off from the upper substrate 410.

A method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention can form a uniform and thick protective layer by spraying a coating composition on a side surface of a liquid crystal display panel using a continuous spray process. Accordingly, curling or peeling of the liquid crystal display panel can be suppressed even in an environment where moisture is present, and the lifetime of the liquid crystal display device can be increased.

The method of fabricating a liquid crystal display panel according to an embodiment of the present invention may include forming a light shielding layer disposed to suppress light leakage occurring between the upper substrate 410 and the lower substrate 420, .

In the liquid crystal display device, light emitted from the backlight unit passes through the liquid crystal display panel 400 and is directed upward. At this time, light leakage may occur between the upper substrate 410 and the lower substrate 420 of the liquid crystal display panel 400. In order to suppress the light leakage phenomenon, a light shielding layer including a light shielding agent is disposed so as to cover the side surfaces of the upper substrate 410 and the lower substrate 420.

The step of forming the light shielding layer may be formed in the same manner as the protective layer 460 as described above. That is, in the same manner as the spraying method described with reference to FIG. 3 and FIGS. 4A to 4I except that the conditions of the coating composition and the coating process are changed to form a light shielding layer in a range capable of suppressing light leakage, Layer can be formed.

On the other hand, the step of forming the light shielding layer may use a pad masking method. Specifically, the material to be transferred is filled on the pad surface, the pad is pressed on the side surface of the liquid crystal display panel 400, and then the material is cured. At this time, depending on the kind of the material for forming the light-shielding layer, thermal curing may be performed or UV curing may be performed. For example, when the material is a thermosetting composition containing a light-shielding agent, the light-shielding layer can be formed by transferring the thermosetting composition to the side of the liquid crystal display panel 400 and thermally curing the thermosetting composition.

Further, the step of forming the light shielding layer may be performed before formation of the protective layer 460, or may be performed after the protective layer 460 is formed.

Hereinafter, a liquid crystal display panel manufactured by a method of manufacturing a liquid crystal display panel including a light shielding layer will be described with reference to FIGS. 5A and 5B. FIG.

5A and 5B are schematic cross-sectional views illustrating a liquid crystal display panel manufactured by a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention.

5A and 5B, the liquid crystal display panels 500a and 500b shown in FIGS. 5A and 5B include a lower polarizer plate 540, a lower substrate 520, an upper substrate 510, an upper polarizer plate 530, Protective layers 560a and 560b, and light-shielding layers 570a and 570b. Here, the lower polarizer 540, the lower substrate 520, the upper substrate 510, and the upper polarizer 530 shown in FIGS. 5A and 5B may include the lower polarizer 440, the lower substrate 420, The upper substrate 410, and the upper polarizer 430, detailed description thereof will be omitted.

5A, the protective layer 560a is a moisture permeation preventive layer that suppresses moisture penetration into the lower polarizer plate 540 and minimizes the peeling phenomenon of the upper polarizer plate 530. In the liquid crystal display panel 500a, (530) and is formed to cover the upper substrate (510) and the lower substrate (520). At this time, in the region overlapping the light shielding layer 570a, the protective layer 560a is formed outside the light shielding layer 570b. The light shielding layer 570a is a layer for suppressing a light leakage phenomenon occurring between the upper substrate 510 and the lower substrate 520 and is formed to cover the side surfaces of the upper substrate 510 and the lower substrate 520. [ The light shielding layer 570a is formed so as to extend not only on the side surfaces of the upper substrate 510 and the lower substrate 520 but also on the back surface of the lower substrate 520, The light passing through the region of the substrate 520 is reduced to prevent light leakage.

The thickness of the protective layer 560a may be 25 占 퐉 to 50 占 퐉, and the thickness of the light-shielding layer 570a may be 2 占 퐉 to 10 占 퐉. In the case of the light-shielding layer 570a including the light-shielding agent, the light leakage phenomenon can be sufficiently suppressed even if the thickness is 2 to 10 mu m. However, in the case of the protective layer 560a for suppressing the penetration of moisture into the upper polarizer 530, when the thickness is less than 25 mu m, moisture penetration into the upper polarizer 530 occurs over time, There is a problem that the thickness of the side surface of the liquid crystal display panel 500a becomes excessively thick and the bezel increases.

The protective layer 560a and the light-shielding layer 570a may all be manufactured by a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention. Through this, a uniform protective layer can be formed. Meanwhile, the light-shielding layer 570a that performs the light-shielding function may be formed by a pad printing method. In the case of the light-shielding layer 570a for suppressing the light leakage phenomenon, sufficient performance can be satisfied even if it is formed by the pad printing method. However, in the case of the protective layer 560a requiring a thickness of 25 占 퐉 or more, a sufficient thickness can not be obtained when the coating composition is applied by the pad printing method. Therefore, the protective layer 560a for suppressing light leakage between the upper substrate 510 and the lower substrate 520 may be formed by a manufacturing method of a liquid crystal display panel according to an embodiment of the present invention, .

Next, the liquid crystal display panel 500b of FIG. 5B is the same as the liquid crystal display panel 500a of FIG. 5A except for the positional relationship of the protective layer 560b and the light-shielding layer 570b, and thus a duplicate description will be omitted.

Specifically, the protective layer 560b is formed to directly contact the lower polarizer 540, the upper substrate 510, and the lower substrate 520. [ The light-shielding layer 570b is formed to cover the upper substrate 510 and the lower substrate 520. However, in the region overlapping with the protective layer 560b, the light-shielding layer 570b is formed on the protective layer 560b.

The liquid crystal display panel according to an embodiment of the present invention includes a protective layer on a side surface thereof. At this time, the protective layer is a moisture permeation preventive layer that suppresses the phenomenon that moisture permeation is suppressed and the upper polarizer plate is peeled from the upper substrate. Since the liquid crystal display panel according to one embodiment includes a uniform protective layer, defects in which the protective layer shines according to the angle can be minimized. Particularly, in the case of the protective layer for suppressing moisture penetration used in the liquid crystal display panel of the present invention, the thickness is sufficiently thicker than that of the protective layer formed by the conventional pad printing method, so that the moisture permeation inhibiting performance is excellent.

A method of manufacturing a liquid crystal display panel according to embodiments of the present invention can be described as follows.

A method of manufacturing a liquid crystal display panel according to an embodiment of the present invention includes: an upper substrate, a lower substrate, and an upper polarizer on the upper substrate, the method comprising: fixing a liquid crystal display panel on a lower stage; Disposing an upper stage on the liquid crystal display panel; Spraying the coating composition on the side of the liquid crystal display panel exposed between the upper stage and the lower stage; And curing the coating composition to form a protective layer.

Spraying the coating composition may include moving a spray nozzle that sprays the coating composition along a side of the liquid crystal display panel.

The step of moving the spray nozzle may include a step of moving the spray nozzle connected to the arm having the plurality of joints at a constant speed while maintaining a constant distance from the side surface of the liquid crystal display panel.

The plurality of joints include at least one first joint for moving the spray nozzle while maintaining a constant spacing from the side surface of the liquid crystal display panel; And at least one second joint for changing the vertical position of the spray nozzle.

The step of spraying the coating composition may include the step of measuring the distance between the side surface of the liquid crystal display panel and the spray nozzle so that the spray nozzle can be moved at regular intervals.

The step of spraying the coating composition comprises spraying the coating composition onto the side of the upper polarizer plate and the angle in the vertical direction between the upper polarizer and the spray nozzle may be between 35 ° and 55 °.

The coating composition may comprise a UV curable resin.

The thickness of the coating composition sprayed on the side surface of the liquid crystal display panel may be 20 탆 to 100 탆.

The step of fixing the liquid crystal display panel includes: aligning the liquid crystal display panel on the lower stage; And fixing the liquid crystal display panel by suctioning the liquid crystal display panel from the lower portion of the lower stage.

And forming a light shielding layer to cover the side surfaces of the upper substrate and the lower substrate.

The step of forming the light-shielding layer includes the steps of: transferring the ink containing the light-shielding agent to cover the side surface of the liquid crystal display panel; And curing the ink.

The thickness of the light-shielding layer may be from 2 탆 to 10 탆, and the thickness of the protective layer may be from 25 탆 to 50 탆.

A method of manufacturing a liquid crystal display panel according to another embodiment of the present invention is a liquid crystal display panel including an upper substrate, a lower substrate, and an upper polarizer on an upper substrate, wherein a side surface of the upper polarizer is protected from moisture penetration, And forming a protective layer covering the interface between the upper substrate and the upper polarizer plate using a spray to suppress discoloration.

The step of forming the protective layer includes a step of spraying the coating composition using a spray which is spaced apart from the side surface of the liquid crystal display panel and moves at a constant speed so that the protective layer is uniformly formed at a thickness of 25 占 퐉 or more .

Forming a light shielding layer between the protective layer and the liquid crystal display panel or outside the protective layer so as to suppress the light leakage of the liquid crystal display panel.

According to an embodiment of the present invention, a coating apparatus for a liquid crystal display panel includes a lower stage for fixing a liquid crystal display panel; An upper stage for covering the upper surface of the liquid crystal display panel; An arm having a plurality of body portions and a plurality of joint portions so as to be movable along a side surface of the liquid crystal display panel; A spray nozzle arranged at one end of the arm and configured to spray a coating composition on a side surface of the liquid crystal display panel; And a control unit for controlling the moving speed of the spray nozzle, the distance between the spray nozzle and the side surface of the liquid crystal display panel, the vertical height of the spray nozzle, and the injection amount.

A plurality of body portions including a first body portion and a second body portion, the plurality of joint portions including: a first joint configured to horizontally rotate the first body portion; A second joint connected to the first body and configured to rotate the second body horizontally; A third joint connected to the second body and configured to adjust a vertical height of the spray nozzle; And a fourth joint connected to the spray nozzle and configured to rotate the spray nozzle in a horizontal direction.

The lower stage includes at least two sub-lower stages, and each of the sub-lower stages may be configured to rotate about the same concentric circle.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

200: Coating device for liquid crystal display panel
210: Lower stage
220: Rotating table
230: upper stage
240: Body
250: Cancer
251: first body part
252: second body part
253: 1st joint
254: second joint
255: Third joint
256: fourth joint
257: nozzle moving part
260: Spray nozzle
270: nozzle mounting portion
400, 500a, 500b: liquid crystal display panel
410, 510: upper substrate
420, 520: Lower substrate
430, 530: upper polarizer
440, 540: lower polarizer plate
450: Protective film
460, 560a, 560b: protective layer
570a, 570b: Shading layer

Claims (18)

A method of manufacturing a liquid crystal display panel including an upper substrate, a lower substrate, and an upper polarizer on the upper substrate,
Fixing the liquid crystal display panel on a lower stage;
Disposing an upper stage on the liquid crystal display panel;
Spraying a coating composition on a side surface of the liquid crystal display panel exposed between the upper stage and the lower stage; And
And curing the coating composition to form a protective layer. The method according to claim 1,
Wherein the step of spraying the coating composition comprises moving a spray nozzle for spraying the coating composition along a side surface of the liquid crystal display panel. 3. The method of claim 2,
Wherein the step of moving the spray nozzle comprises moving the spray nozzle connected to the arm having a plurality of joints at a constant speed while maintaining a constant distance from the side surface of the liquid crystal display panel. The method of claim 3,
Wherein the plurality of joints comprise:
At least one first joint for moving the spray nozzle while keeping a predetermined distance from a side surface of the liquid crystal display panel; And
And at least one second joint for changing the vertical position of the spray nozzle. 3. The method of claim 2,
Wherein the step of spraying the coating composition includes sensing a distance between the side surface of the liquid crystal display panel and the spray nozzle so that the spray nozzle can move at a predetermined interval. 3. The method of claim 2,
Wherein the step of spraying the coating composition comprises the step of spraying a coating composition on the side of the upper polarizer plate,
Wherein an angle in a vertical direction between the upper polarizer plate and the spray nozzle is in a range of 35 to 55 degrees. The method according to claim 1,
Wherein the coating composition comprises a UV curable resin. The method according to claim 1,
Wherein the thickness of the coating composition sprayed on the side surface of the liquid crystal display panel is 20 占 퐉 to 100 占 퐉. The method according to claim 1,
The step of fixing the liquid crystal display panel includes:
Aligning the liquid crystal display panel on the lower stage; And
And fixing the liquid crystal display panel by suctioning the liquid crystal display panel from the lower portion of the lower stage. The method according to claim 1,
And forming a light shielding layer to cover the side surfaces of the upper substrate and the lower substrate. 11. The method of claim 10,
The step of forming the light-
Transferring the ink containing the light shielding agent to cover the side surface of the liquid crystal display panel; And
And curing the ink. ≪ IMAGE > 11. The method of claim 10,
The thickness of the light shielding layer is 2 to 10 占 퐉,
Wherein the thickness of the protective layer is 25 占 퐉 to 50 占 퐉. A method of manufacturing a liquid crystal display panel including an upper substrate, a lower substrate, and an upper polarizer on the upper substrate,
And forming a protective layer covering the interface between the upper substrate and the upper polarizer plate using spray to protect the side surface of the upper polarizer plate from penetration of moisture to suppress lifting and discoloration of the upper polarizer plate, A method of manufacturing a panel. 14. The method of claim 13,
The forming of the protective layer may include spraying the coating composition using the spray which is spaced apart from the side surface of the liquid crystal display panel and moves at a constant speed so that the protective layer is uniformly formed with a thickness of 25 占 퐉 or more Wherein the method comprises the steps of: 14. The method of claim 13,
Further comprising the step of forming a light shielding layer between the protective layer and the liquid crystal display panel or outside the protective layer so as to suppress the light leakage of the liquid crystal display panel. A lower stage for fixing the liquid crystal display panel;
An upper stage covering the upper surface of the liquid crystal display panel;
An arm having a plurality of body portions and a plurality of joint portions so as to be movable along a side surface of the liquid crystal display panel;
A spray nozzle disposed at one end of the arm and configured to spray a coating composition on a side surface of the liquid crystal display panel; And
And a control unit for controlling a moving speed of the spray nozzle, a distance between the spray nozzle and a side surface of the liquid crystal display panel, a vertical height of the spray nozzle, and an injection amount. 17. The method of claim 16,
Wherein the plurality of body portions include a first body portion and a second body portion,
Wherein the plurality of joints comprise:
A first joint configured to horizontally rotate the first body part;
A second joint connected to the first body and configured to rotate the second body horizontally;
A third joint connected to the second body and configured to adjust a vertical height of the spray nozzle; And
And a fourth joint connected to the spray nozzle and configured to rotate the spray nozzle horizontally. 17. The method of claim 16,
Wherein the lower stage includes at least two sub-lower stages, and each of the sub-lower stages is configured to rotate about the same concentric circle.

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