KR101366987B1 - Method for manufacturing color filter substrate - Google Patents

Abstract

Disclosed is a method of manufacturing a color filter substrate provided in a liquid crystal display. A method of manufacturing a color filter substrate includes mounting a substrate on a stage, arranging a mask on the substrate so as to be spaced apart from the substrate, supplying a pigment liquid into a nozzle disposed on the mask, and the pigment liquid has a polarity. The strips include applying a polarity voltage to the nozzle to cause the pigment droplets, and spraying the pigment droplets onto the substrate.

Electrostatic spray, droplets, black matrix, color filter, overcoat

Description

Manufacturing Method of Color Filter Substrate {METHOD FOR MANUFACTURING COLOR FILTER SUBSTRATE}

1 is a view for schematically explaining a color filter substrate according to an embodiment of the present invention.

2 is a view for schematically explaining the principle of electrostatic spraying for manufacturing the color filter substrate shown in FIG.

3 is a view for explaining the spray angle of the droplet when the polarity voltage is applied to the nozzle shown in FIG.

4 is a view for explaining the spray angle of the droplet when the voltage of the same polarity is applied to the nozzle and the guard plate disposed adjacent to the nozzle shown in FIG.

FIG. 5 is a view for explaining spray angles of droplets when voltages of different polarities are applied to the nozzles shown in FIG. 2 and guard plates disposed adjacent thereto.

6 is a view for schematically explaining the configuration of the electrostatic spraying device according to the first embodiment of the present invention.

7 is a flowchart illustrating a method of manufacturing a color filter substrate according to a first embodiment of the present invention.

8 is a view for schematically explaining the configuration of an electrostatic spraying device according to a second embodiment of the present invention.

9 is a flowchart schematically illustrating a method of manufacturing a color filter substrate according to a second embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS FIG.

100: color filter substrate 110: substrate

120: black matrix 130: overcoat film

200: electrostatic spraying device 210: stage

220: nozzle 230: liquid supply device

240: high voltage supply 250: mask

R / G / B: Red / Green / Blue Color Filter

The present invention relates to a method for manufacturing a color filter substrate provided in a liquid crystal display device.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. In response, flat panel displays (FPDs) such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs), etc. Usage is increasing. Among them, a liquid crystal display capable of realizing high resolution and miniaturization as well as a large size is widely used.

Generally, a liquid crystal display device can display an image using the electro-optical characteristic of a liquid crystal.

To this end, the liquid crystal display device may include a color filter substrate and a thin film transistor substrate which are opposed to each other with a liquid crystal therebetween.

The color filter substrate may implement a color of an image displayed through the liquid crystal display.

To this end, the color filter substrate may include a black matrix, a color filter, and an overcoat layer formed on the first substrate.

The thin film transistor substrate may provide a driving voltage to the liquid crystal to drive the liquid crystal.

To this end, the thin film transistor substrate may include a thin film transistor and a pixel electrode formed on the second substrate. Further, the thin film transistor substrate may further include a common electrode. Here, the common electrode may be formed on the color filter substrate.

In the conventional liquid crystal display having the above-described configuration, each of the black matrix, the color filter, and the overcoat layer of the color filter substrate should be uniformly formed to the desired thickness over the entire surface of the first substrate due to the non-uniform thickness in each subsequent process. One failure does not occur. Here, as defects resulting from non-uniform thickness, protrusion generation by aggregation of a color pigment, etc. are mentioned, for example.

In order to form, for example, a color filter having a uniform thickness on the first substrate, first, it is necessary to apply a color pigment liquid containing a color pigment on the substrate to a uniform thickness. Here, the color filter may be formed due to the curing of the color pigment liquid.

To this end, conventionally, a spin coating method using a centrifugal force generated by pouring a quantitative color pigment liquid into a central portion of a substrate and rotating the substrate is mainly used.

However, the spin coating method has a problem that the consumption amount of the color pigment liquid is very high. In addition, the spin coating method has a problem that it is difficult to apply to a large area substrate. And, when using the spin coating method, there is a problem that the color pigment contained in the color pigment liquid may be unevenly distributed according to the position.

For this reason, while the unit cost of a color filter substrate rises, productivity of a color filter substrate may deteriorate.

The above-mentioned problems are not only seen when forming the color filter, but may also appear when forming the black matrix and the overcoat film.

Accordingly, an object of the present invention is to provide a method of manufacturing a color filter substrate capable of making at least one of the black matrix, the color filter, and the overcoat film have a uniform thickness over the entire surface of the substrate.

In addition, another technical problem to be achieved by the present invention is to provide a manufacturing method of a color filter substrate that can improve the productivity while reducing the cost of the color filter substrate.

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

According to an aspect of the present invention, there is provided a method of manufacturing a color filter substrate, the method comprising: seating a substrate on a stage; Disposing a mask on the substrate to be spaced apart from the substrate; Supplying a pigment liquid into a nozzle disposed on the mask; Applying a voltage of polarity to the nozzle such that the pigment liquid is a polarized pigment droplet; And spraying the pigment droplet onto the substrate.

On the other hand, the method for manufacturing a color filter substrate according to the present invention for achieving the above technical problem comprises the steps of mounting a substrate on which a black matrix and a color filter is formed; Supplying an overcoat liquid to form an overcoat film on the substrate into a nozzle disposed on the substrate; Applying a polarity voltage to the nozzle such that the overcoat liquid is a polar overcoat droplet; And spraying the overcoat droplet onto the substrate.

The details of other embodiments are included in the detailed description and drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

Hereinafter, a method of manufacturing a color filter substrate according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for schematically explaining a color filter substrate according to an embodiment of the present invention.

Referring to FIG. 1, the color filter substrate 100 according to an exemplary embodiment of the present invention may be provided in a liquid crystal display, which is a type of flat panel display.

When the color filter substrate 100 is provided in the liquid crystal display, the color filter substrate 100 may implement a color of an image displayed through the liquid crystal display.

To this end, the color filter substrate 100 according to the embodiment of the present invention may include a black matrix 120, a color filter (R / G / B) and an overcoat layer 130 formed on the substrate 110. . In addition, the color filter substrate 100 according to the embodiment of the present invention may further include a back ITO (Induim Tin Oxide) layer for preventing static electricity flowing into the color filter substrate 100 from the outside. Here, the substrate 110 may have a transparent material such as glass or plastic, but is not limited thereto.

The black matrix 120 may block light incident from the outside.

Specifically, when the color filter substrate 100 is provided in the liquid crystal display, the black matrix 120 blocks the light so that the light incident from the outside does not pass through the area where the liquid crystal display cannot control the liquid crystal. The contrast of the liquid crystal display device can be increased.

The black matrix 120 may not be formed on the substrate 110 through a spin coating method, but may be formed through electrostatic spraying of a black pigment liquid including a black pigment. In this case, the black matrix 120 may be formed by curing the black pigment solution, and a mask may be used to form the black matrix 120.

The color filters R / G / B may express colors using light incident from the outside.

In detail, the color filters R / G / B may express colors by transmitting light having a specific wavelength band among light incident from the outside.

To this end, the color filters R / G / B transmit red / green / blue light from the light incident from the outside to express the red / green / blue color filters R / G / B. ) May be included. In this case, various colors may be realized through additive mixing of red / green / blue light transmitted through each of the red / green / blue color filters (R / G / B).

The color filters R / G / B may not be formed on the substrate 110 through a spin coating method, but may be formed through electrostatic spraying of color pigment liquids including color pigments. In this case, color filters (R / G / B) may be formed due to the curing of the color pigment liquid, and a mask may be used to form the color filters (R / G / B).

The overcoat layer 130 may remove a step of the color filter (R / G / B) generated at a portion where the black matrix 120 and the color filter (R / G / B) overlap. That is, the overcoat layer 130 may planarize the entire substrate 110.

To this end, the overcoat layer 130 may be formed on the entire surface of the substrate 110 to cover the black matrix 120 and the color filters R / G / B.

The overcoat layer 130 may not be formed on the substrate 110 through a spin coating method, but may be formed through electrostatic spraying of the overcoat liquid. In this case, since the overcoat layer 130 may be formed on the entire surface of the substrate 110, a separate mask may not be necessary for forming the overcoat layer 130.

In the color filter substrate 100 according to the embodiment of the present invention having the above-described configuration, each of the black matrix 120, the color filter R / G / B, and the overcoat layer 130 is electrostatically sprayed as described above. It can be formed through. Prior to describing the method of manufacturing the color filter substrate 100 according to the embodiment of the present invention through the electrostatic spraying, the principle of the electrostatic spraying will be described with reference to FIG. 2.

2 is a view for schematically explaining the principle of electrostatic spraying for manufacturing the color filter substrate shown in FIG.

Referring to FIG. 2, electrostatic spray refers to dispersing the liquid 140 into small droplets 150 with pure electric force alone.

In the electrostatic spraying apparatus using the electrostatic spraying, the liquid 140 is split into droplets 150 having the corresponding polar ions according to the polarity voltage applied to the fine capillary nozzle 160, and then on the substrate 170. Can be sprayed.

Specifically, for example, when the voltage of the anode is applied to the nozzle 160 so that the nozzle 160 acts as an anode, the anions that have been dissolved in the liquid 140 introduced into the nozzle 160 are discharged to the nozzle 160. In addition to implanting or moving to the walls of the cyan, the remaining cations can be pushed out to the meniscus.

At this time, as the voltage of the anode applied to the nozzle 160 is increased, the repulsive force of the electric force and the cations acting on the liquid curved surface is greater than the surface tension of the liquid 140 so that the liquid curved surface at the end of the nozzle 160 It forms the shape, which is called the cone-jet mode. Herein, the liquid curved surface is a cone of liquid (liquid cone) 142, and the liquid jet 144 is formed by receiving a surface tangential stress (surface tangential stress) at the end of the liquid cone (142).

The liquid column 144 is broken into droplets 150 having a predetermined size, for example, several tens of nanometers to several tens of micrometers due to disturbance of surface waves acting on the surface of the liquid column 144 at the end of the liquid column 144. Droplets 150 may be sprayed onto substrate 170.

As such, the droplets 150 sprayed onto the substrate 170 through the electrostatic spray not only have a monodisperse distribution but also the droplets 150 are well-connected with each other because the surface of the droplets 150 is charged with the same polarity. The advantage is that it does not aggregate.

Meanwhile, when the broken droplets 150 are sprayed onto the substrate 170, the spray angle of the droplets 150 may be adjusted to increase the spraying efficiency and accuracy.

For this purpose, after the guard plate is disposed adjacent to the nozzle 160, a polarity voltage may be applied to the guard plate. This will be described with reference to FIGS. 3 to 5.

3 is a view for explaining the spray angle of the droplet when the polarity voltage is applied to the nozzle shown in FIG. 4 is a view for explaining the spray angle of the droplet when the voltage of the same polarity is applied to the nozzle and the guard plate disposed adjacent to the nozzle shown in FIG. FIG. 5 is a view for explaining spray angles of droplets when voltages of different polarities are applied to the nozzles shown in FIG. 2 and guard plates disposed adjacent thereto.

First, as shown in FIG. 3, when the polarity voltage is applied to the nozzle 160 without arranging the guard plate, the droplet 150 is sprayed onto the substrate 170 at a predetermined spray angle θ1. Can be.

However, as shown in FIG. 4, after the guard plate 180 is disposed adjacent to the nozzle 160, a voltage having the same polarity as that of the nozzle 160 is applied to the guard plate 180. By an external electric field of the same polarity generated at 180, the spray angle θ2 of the droplet 150 may be smaller than the spray angle θ1 when the guard plate 180 is not disposed.

In contrast, as shown in FIG. 5, when the guard plate 180 is disposed adjacent to the nozzle 160, and a voltage having a different polarity than that of the nozzle 160 is applied to the guard plate 180, the guard plate ( Due to the opposite polarity of the external electric field generated at 180, the spray angle θ3 of the droplet 150 may be greater than the spray angle θ1 when the guard plate 180 is not disposed.

On the other hand, Figure 6 is a view for schematically explaining the configuration of the electrostatic spraying apparatus according to the first embodiment of the present invention. The electrostatic spraying device shown in FIG. 6 may be used to manufacture the color filter substrate shown in FIG. 1. This will be described later with reference to FIG.

Referring to FIG. 6, the electrostatic spraying device 200 according to the first embodiment of the present invention may include a stage 210, a nozzle 220, a liquid supply device 230, a high voltage supply 240, and the like. .

On the stage 210, a substrate 110, which is an object to be processed, may be seated. A plurality of vacuum adsorption holes are formed on the upper surface of the stage 210. The vacuum adsorption holes allow the substrate 110 to be vacuum adsorbed onto the stage 210 during electrostatic spraying.

The nozzle 220 may be formed of a metal material such that the inside of the nozzle 220 has a fine capillary shape. A plurality of such nozzles 220 may be used. This is to solve this problem, since a small flow rate of liquid may be supplied to the nozzle 220. Meanwhile, the guard plate 180 may be disposed to be adjacent to the nozzle 220 in order to adjust the spray angle of the droplet formed by splitting the liquid.

The liquid supply device 230 may store liquid in a storage space provided therein. In this case, the liquid stored in the liquid supply device 230 may be supplied to the nozzle 220 by the pumping means.

The high voltage supplyer 240 may generate a voltage of several kilowatts to several hundred kilowatts using, for example, a power input from an external source.

The voltage of the anode generated by the high voltage supplyer 240 may be provided to, for example, a nozzle 220 and a mask 250 disposed to be spaced apart from the substrate 110 on the substrate 110.

As such, the reason for applying the same polarity to the nozzle 220 and the mask 250 is to adjust the spray angle of the droplet sprayed from the nozzle 220. Since the principle thereof is the same as the principle that the guard plate affects the spray angle of the droplet, its detailed description is omitted. On the other hand, voltages of different polarities may be applied to the nozzle 220 and the mask 250.

The voltage of the cathode generated by the high voltage supplyer 240 may be applied to the substrate 110. Here, the ground voltage may be applied to the substrate 110 instead of the voltage of the cathode.

7 is a flowchart illustrating a method of manufacturing the color filter substrate according to the first embodiment of the present invention. FIG. 7 is a flowchart illustrating a manufacturing process for manufacturing the color filter substrate according to the first embodiment of the present invention using the electrostatic spray apparatus shown in FIG. 6. At least one of the black matrix and the color filter may be formed on the substrate through the manufacturing process flow chart illustrated in FIG. 7. Hereinafter, the black matrix is formed on the substrate for convenience of description. .

6 and 7, in order to manufacture the color filter substrate 100 according to the first embodiment of the present invention, the substrate 110 is first mounted on the stage 210 (S100). Here, the substrate 110 may be vacuum adsorbed on the stage 210.

Subsequently, the mask 250 is disposed on the substrate 110 to be spaced apart from the substrate 110 (S110). Here, an area corresponding to the area where the black matrix 120 is to be formed may be opened in the mask 250.

Subsequently, a pigment liquid, for example, a black pigment liquid is supplied into the nozzle 220 disposed on the mask 250 (S120). Here, the black pigment liquid may be previously stored in the liquid supply device 230, and may be supplied from the liquid supply device 230 to the nozzle 220 by a pumping means. Here, the guard plate may be disposed to be adjacent to the nozzle 220 to adjust the spray angle of the black pigment droplet 260 formed by splitting the black pigment liquid.

Subsequently, a voltage of polarity is applied to the nozzle 220 such that the black pigment liquid becomes a polarized black pigment droplet 260 (S130). Here, the voltage of the anode generated by the high voltage supplyer 240 may be provided to the nozzle 220 and the mask 250, and the voltage of the cathode generated by the high voltage supplyer 240 may be provided to the substrate 110. It is not limited to this.

Subsequently, the black pigment droplet 260 is sprayed onto the substrate 110 through the nozzle 220 (S140). Here, the substrate 110 may be heated to dry the black pigment droplet 260 sprayed on the substrate 110. In this case, as the black pigment droplet 260 is cured, a black matrix 120 may be formed on the substrate 110.

Using such electrostatic spraying, the black pigment droplets 260 may be electrostatically repulsive. For this reason, the black pigment droplet 260 may be uniformly applied on the substrate 110, thereby forming a black matrix 120 having a uniform thickness over the entire surface of the substrate 110. As a result, the unit cost of the color filter substrate 100 according to the first embodiment of the present invention can be reduced and productivity can be improved.

8 is a diagram schematically illustrating a configuration of an electrostatic spraying device according to a second embodiment of the present invention. The electrostatic spraying device shown in FIG. 8 can be used to manufacture a color filter substrate according to an embodiment of the invention. This will be described later with reference to FIG. 9. On the other hand, in the electrostatic spraying device shown in Figure 8, the mask is not disposed separately. Accordingly, since the configuration of the electrostatic spraying device shown in FIG. 8 is the same as the configuration of the electrostatic spraying device according to the first embodiment of the present invention shown in FIG. 6 except for the high voltage supply, overlapping descriptions are omitted. Only its features will be described.

Referring to FIG. 8, the electrostatic spraying device 200 according to the second embodiment of the present invention may include a stage 210, a nozzle 220, a liquid supply device 230, a high voltage supply 240, and the like. .

The high voltage supplyer 240 may generate a voltage of several kilowatts to several hundred kilowatts using, for example, a power input from an external source.

The voltage of the positive electrode generated by the high voltage supplyer 240 may be applied to, for example, the nozzle 220.

The voltage of the cathode generated by the high voltage supplyer 240 may be applied to the substrate 110. Here, the ground voltage may be applied to the substrate 110 instead of the voltage of the cathode.

9 is a flowchart schematically illustrating a method of manufacturing a color filter substrate according to a second embodiment of the present invention. FIG. 9 is a flowchart illustrating a manufacturing process for manufacturing a color filter substrate according to a second embodiment of the present invention using the electrostatic spray apparatus shown in FIG. 8. Through the manufacturing process flowchart shown in FIG. 9, an overcoat film may be formed on a substrate.

8 and 9, in order to manufacture the color filter substrate 100 according to the second embodiment of the present invention, first, a substrate on which the black matrix 120 and the color filter R / G / B are formed ( 110 is seated on the stage 210 (S200). Here, the substrate 110 may be vacuum adsorbed on the stage 210.

Subsequently, the overcoat liquid is supplied into the nozzle 220 disposed on the substrate 110 (S210). Here, the overcoat liquid may be previously stored in the liquid supply device 230, and may be supplied from the liquid supply device 230 to the nozzle 220 by a pumping means. Here, the guard plate may be disposed to be adjacent to the nozzle 220 to adjust the spray angle of the overcoat droplet 270 formed by splitting the overcoat liquid.

Subsequently, a voltage of polarity is applied to the nozzle 220 such that the overcoat liquid becomes polar overcoat droplet 270 (S220). Here, the voltage of the positive electrode generated by the high voltage supplyer 240 may be provided to the nozzle 220, and the voltage of the negative electrode generated by the high voltage supplyer 240 may be provided to the substrate 110, but is not limited thereto. .

Subsequently, the overcoat droplet 270 is sprayed onto the substrate 110 through the nozzle 220 (S230). Here, the substrate 110 may be heated to dry the overcoat droplets 270 sprayed on the substrate 110. In this case, as the overcoat droplet 270 is cured, an overcoat layer 130 may be formed on the substrate 110.

Using such electrostatic spraying, the overcoat droplets 270 may be electrostatically repulsive. For this reason, the overcoat droplet 270 may be uniformly coated on the substrate 110, thereby forming an overcoat layer 130 having a uniform thickness over the entire surface of the substrate 110. . As a result, the unit cost of the color filter substrate 100 according to the second embodiment of the present invention can be reduced and productivity can be improved.

On the other hand, as described above, in the manufacturing method of the color filter substrate 100 according to the embodiment of the present invention, each of the black matrix 120, the color filter (R / G / B) and the overcoat layer 130 through electrostatic spraying Although the formation of the present invention has been described, the present invention is not limited thereto, and the back ITO layer of the color filter substrate 100 may also be formed through electrostatic spraying.

In addition, the embodiments mentioned above may be applied to all fields to which the electrostatic spray can be applied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

When the color filter substrate is formed using the electrostatic spray according to the present invention, the droplets may be charged with the same polarity so that the droplets may not aggregate with each other well. Because of this, droplets can be sprayed uniformly over the entire surface of the substrate. For this reason, each of the black matrix, the color filter, and the overcoat film may be formed to have a uniform thickness over the entire surface of the substrate. Through this, the cost of the color filter substrate can be reduced and productivity can be improved.

Claims (14)

Mounting the substrate on the stage; Disposing a mask on the substrate to be spaced apart from the substrate; Supplying a pigment liquid into a nozzle disposed on the mask; Applying a voltage of polarity to the nozzle such that the pigment liquid is a polarized pigment droplet; Spraying said pigment droplets onto a substrate; Placing a guard plate adjacent the nozzle to adjust the spray angle of the pigment droplets; And Heating the substrate to dry pigment droplets sprayed onto the substrate, The mask and the guard plate are applied with a voltage of the same polarity or a voltage of opposite polarity to the voltage of the polarity applied to the nozzle, The substrate is applied with a voltage opposite to that of the polarity applied to the nozzle or a ground voltage, And said pigment liquid is a black pigment liquid for forming a black matrix on said substrate or a color pigment liquid for forming a color filter on said substrate. delete delete delete delete delete delete delete Mounting the substrate on which the black matrix and the color filter are formed on the stage; Supplying an overcoat liquid to form an overcoat film on the substrate into a nozzle disposed on the substrate; Applying a polarity voltage to the nozzle such that the overcoat liquid is a polar overcoat droplet; Spraying the overcoat droplet onto a substrate; Placing a guard plate adjacent to the nozzle to adjust the spray angle of the overcoat droplet; And Further comprising heating the substrate to dry the overcoat droplets sprayed onto the substrate, The guard plate is applied with the voltage of the same polarity or the voltage of the opposite polarity and the voltage of the polarity applied to the nozzle, And a voltage of a polarity opposite to that of the polarity applied to the nozzle or a ground voltage is applied to the substrate. delete delete delete delete delete

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