KR102436187B1 - Method For Manufacturing Of Antistatic Film And Method For Manufacturing Of Display Device Using The Same - Google Patents

Abstract

The method of manufacturing an antistatic film according to an embodiment of the present invention improves the stability of the conductive coating solution composition for the preparation of the antistatic film by removing ethanol generated during the sol reaction of the alkoxysilane compound. To this end, an alkoxysilane compound, an alcohol-based solvent, and water are mixed to react the alkoxysilane compound with the sol, and then ethanol generated during the sol reaction is removed to form a silane sol. Then, a conductive coating composition is prepared by mixing the carbon nanotube dispersion composition and the silane sol, and coated on a substrate to prepare an antistatic film.

Description

Method For Manufacturing Of Antistatic Film And Method For Manufacturing Of Display Device Using The Same

The present invention relates to a method of manufacturing an antistatic film and a method of manufacturing a display device.

With the recent rapid development of the information society, the need for a flat panel display with excellent characteristics such as thinness, light weight, and low power consumption has emerged. Because of its excellent color display and picture quality, it is being actively applied to laptops and desktop monitors.

In general, in a liquid crystal display device, two substrates each having electrodes formed on one surface are arranged so that the surfaces on which the electrodes are formed face each other, a liquid crystal material is interposed between the two substrates, and then a voltage is applied to the electrodes formed on each substrate. It is a device that expresses an image by the transmittance of light that changes according to the movement of liquid crystal molecules by the electric field generated by the application. In this case, a lot of static electricity is generated in the process of performing a unit process in manufacturing each substrate of the liquid crystal display device.

Accordingly, indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), which is a transparent conductive material, is applied to the outer surface of the upper substrate to discharge static electricity and effectively discharge the charged charges during the formation of a finished product. It is used as an antistatic film. However, since indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) is a very expensive transparent conductive metal material, it is a factor in improving the manufacturing cost. In particular, indium, the main raw material of indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), is a rare metal and its price has risen sharply in recent years. This is becoming difficult.

In recent years, a product having a function that can be operated by touching a screen in which a touch sensor is built-in in a personal mobile phone, PDA, or laptop has been released, attracting a lot of attention from users. Taking advantage of this trend, various attempts have been made recently in order to have a touch function even in a liquid crystal display device used as a display device in various application products. Among them, the demand for an in-cell type liquid crystal display with a touch function mounted therein is increasing. The in-cell touch type liquid crystal display device forms a touch electrode inside the display panel without attaching a separate touch panel on the liquid crystal display device, so it has advantages such as product slimness, cost structure improvement due to material cost reduction, and weight reduction.

However, even if the touch sensor is provided in an in-cell type inside the display panel, it is discharged by the above-described antistatic film, so that the change in capacitance generated by the touch of a finger cannot be sensed, and the touch sensitivity of the touch sensor is lowered. is occurring In other words, since the antistatic film has relatively high electrical conductivity compared to the size of the capacitance generated by the finger touch, the antistatic film acts as a conductor to generate a discharge, and the touch sensor recognizes the touch of the operator's finger, etc. won't be able to do it.

Therefore, if the antistatic film is removed to solve this problem, the defect rate increases due to the generation of static electricity during the manufacturing process.

An object of the present invention is to provide a method for manufacturing an antistatic film for providing a conductive coating solution composition having excellent storage stability at room temperature.

Another object of the present invention is to provide a display device including an antistatic film manufactured according to a method for manufacturing an antistatic film.

In addition, the present invention easily discharges static electricity generated during the manufacturing process to the outside to suppress defects caused by static electricity, prevent a decrease in touch sensitivity, improve sheet resistance uniformity, heat resistance and reliability, and reduce manufacturing costs. An object of the present invention is to provide a barrier film and a display device.

In order to achieve the above object, the method for manufacturing an antistatic film according to an embodiment of the present invention removes ethanol generated during the sol reaction of the alkoxysilane compound to improve the stability of the conductive coating solution composition for the preparation of the antistatic film. To this end, an alkoxysilane compound, an alcohol-based solvent, and water are mixed to react the alkoxysilane compound with the sol, and then ethanol generated during the sol reaction is removed to form a silane sol. Then, a conductive coating composition is prepared by mixing the carbon nanotube dispersion composition and the silane sol, and coated on a substrate to prepare an antistatic film. Ethanol is removed using rotary evaporation, and an additional solvent corresponding to the amount of ethanol removed is added, wherein the additional solvent may have a polarity of 1.0 to less than 5.9.

In addition, in the method of manufacturing a display device according to an embodiment of the present invention, the above-described antistatic film is formed on one surface of the display panel to prevent defects due to static electricity and decrease touch sensitivity.

The present invention can prevent a change in the viscosity of the conductive coating solution composition when stored at room temperature, and prevent a change in the surface resistance of the antistatic film formed of the conductive coating solution composition at room temperature. Therefore, the method for producing an antistatic film of the present invention can improve the storage stability of the conductive coating liquid composition at room temperature and the room temperature stability of the antistatic film.

The antistatic film prepared according to the present invention exhibits excellent electrical conductivity, and also has excellent mechanical strength and transmittance, and can be used as an antistatic coating film for touch screen panels and image display devices.

The display device manufactured according to the present invention easily discharges static electricity generated during the manufacturing process to the outside to suppress defects caused by static electricity, prevent a decrease in touch sensitivity, improve surface resistance uniformity, heat resistance and reliability, and manufacture cost can be reduced.

1 is a cross-sectional view showing a general display device;
2 is a cross-sectional view illustrating a display device according to an embodiment of the present invention;
FIG. 3 is a front view of the display device of FIG. 2 ;
4 is a view showing a plan view of an antistatic film according to an embodiment of the present invention.
5A is a table showing the sheet resistance value and the sheet resistance uniformity of the antistatic film with respect to the sheet resistance of the carbon nanotube according to the embodiment, and FIG. 5B is a graph showing the sheet resistance uniformity of FIG. 5A.
6 is a graph showing the sheet resistance value of the antistatic film with respect to the content of carbon nanotubes according to the embodiment.
7 is a table showing light transmittance with respect to the content and sheet resistance of carbon nanotubes according to the embodiment;
8A is a graph showing the change in the sheet resistance value of a general antistatic film with time, and FIG. 8B is a graph showing the change in the sheet resistance value of the antistatic film according to the embodiment in a high temperature and high humidity environment.
9 is a graph comparing the weight % according to the temperature of the general antistatic film and the weight % according to the temperature of the antistatic film according to the embodiment.
10 is a reaction scheme showing the sol reaction of the alkoxysilane compound of the present invention.
11 and 12 are views schematically showing a display device according to the present invention.
13 is a waveform diagram illustrating a common voltage Vcom and a touch driving signal Tdrv applied to the touch sensor Cs shown in FIG. 11 .
14 is a cross-sectional view of a display panel according to the present invention;
15 is a flowchart illustrating a method of manufacturing a display device according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Also, in describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It should be understood that elements may be “connected,” “coupled,” or “connected.” In the same vein, when it is described that a component is formed "on" or "below" another component, the component is both formed directly or indirectly through another component on the other component. should be understood as including

1 is a cross-sectional view showing a general display device.

Referring to FIG. 1 , the display device 100 includes a lower substrate 120 , an upper substrate 140 facing the lower substrate 120 , and an antistatic film 150 positioned on the upper substrate 140 . . A lower polarizing plate 110a is positioned on the outer surface (downward direction in the drawing) of the lower substrate 120, and a cell 130 is positioned between the lower substrate 120 and the upper substrate 130, and the cell 130. A touch electrode (TE) may be disposed therein. Meanwhile, an upper polarizing plate 110b is positioned on the upper substrate 140 , and an antistatic film 150 is positioned on the upper polarizing plate 110b.

The display device 100 of FIG. 1 is an in-cell type display device 100 in which the touch electrode TE is located inside the cell 130 . However, this is an example, and is for convenience of description. The cell 130 may be, for example, a liquid crystal layer, and the display device 100 may be a liquid crystal display.

Meanwhile, the antistatic film 150 is made of indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), which is a transparent conductive material, or a conductive polymer, for example, PEDOT:PSS (polyethylenedioxythiphene:polystyrene sulfonic acid). ) can be made. However, since indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) is a very expensive metal material, it is a factor for improving the manufacturing cost. In particular, indium, the main raw material of indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), is a rare metal and its price has risen sharply in recent years. This is becoming difficult. Also, since indium-zinc-oxide (IZO) has a relatively low sheet resistance and high electrical conductivity, a voltage generated by a touch of a finger or the like is discharged due to the antistatic film 150 , , this causes a problem that the touch sensor cannot recognize the touch. In addition, when the antistatic film 150 is made of a material such as PEDOT:PSS, reliability is deteriorated in a high temperature or high humidity (or high humidity) environment.

Meanwhile, the antistatic film 150 is connected to the edge of the lower substrate 120 through the first conductive member 170a, the conductive connecting member 172, and the second conductive member 170b. Although not shown, a ground pad made of a conductive material may be positioned on the edge of the lower substrate 120 . Static electricity generated in the display device 100 is discharged to the outside due to the conductive material of the antistatic film 150 , the first conductive member 170a , the conductive connection member 172 , the second conductive member 170b , and the lower substrate 120 . discharged

The first conductive member 170a and the second conductive member 170b may be made of, for example, a metal material such as silver (Ag), and the conductive connecting member 172 may also be made of a metal material. However, since the first conductive member 170a, the conductive connecting member 172, and the second conductive member 170b must be respectively formed, the number of processes increases and the manufacturing cost increases.

Hereinafter, an antistatic film and a display device including the same according to embodiments of the present invention, which will be described later, have a structure that solves the above-described problems.

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

<First embodiment>

2 is a cross-sectional view of a display device according to an embodiment of the present invention, FIG. 3 is a front view of the display device of FIG. 2, and FIG. 4 is a plan view of an antistatic film according to an embodiment of the present invention.

2 to 4 , the display device 200 includes a display panel 205 positioned on a lower polarizing plate 210a , an upper polarizing plate 210b positioned on the display panel 205 , and a display panel 205 . ) and an antistatic film 250 disposed between the upper substrate 240 and the upper polarizing plate 210b.

In more detail, the display panel 205 includes a lower substrate 220 , a cell 230 , and an upper substrate 240 sequentially stacked. Here, the lower substrate 220 may be an array substrate 220 on which transistors for driving the cells 230 and various signal wirings and electrodes are formed, and the upper substrate 240 includes a color filter (not shown) and black The matrix (Black Matrix, not shown) may be the color filter substrate 240 . In this specification, the lower substrate 220 may be used in the same meaning as the array substrate 220 , and the upper substrate 240 may be used in the same meaning as the color filter substrate 240 . The lower substrate 220 and the upper substrate 240 may be made of, for example, glass, but is not limited thereto.

The display panel 205 may be a liquid crystal display panel 205 including a liquid crystal layer, and the display device 200 may be a liquid crystal display device 200 . However, in this specification, the liquid crystal display 200 is mainly described, but the present invention is not limited thereto. For example, the cell 230 may be an organic layer of an organic light emitting display device. When the display device 200 is the liquid crystal display device 200 , the cell 230 may include liquid crystal. Accordingly, by applying a voltage to the electrodes formed on each of the substrates 220 and 240 to move the liquid crystal by an electric field generated, an image is expressed by the light transmittance that varies accordingly.

A touch electrode may be formed in the cell 230 . As described above, the display device 200 may be an in-cell type display device 200 , and accordingly, electrodes for a touch function (Touch Electrodes, TE), for example, Rx and Tx electrodes, are formed in the cell 230 . ) is built in. Since the in-cell touch type liquid crystal display 200 forms a touch electrode inside the display panel 205 without attaching a separate touch panel on the liquid crystal display 200, the cost structure is improved by slimming the product and reducing material costs. , light weight, etc. For example, although not shown, the structure for the touch function may be an In-Plane Switching mode (IPS mode), but is not limited thereto.

The lower polarizing plate 210a and the upper polarizing plate 210b polarize light and emit it to the outside of the liquid crystal display 200 . However, when the lower polarizing plate 210a and the upper polarizing plate 210b are attached to the display panel 205 , static electricity may be generated. In addition, there may be a problem in that static electricity is generated even during driving for image display.

An antistatic film 250 is disposed to remove static electricity. The antistatic film 250 includes a matrix material 252 and carbon nanotubes (CNTs, 254) dispersed in the matrix material 252 , and the sheet resistance of the antistatic film 250 . Resistance) value may be 10 ⁴ Ω/□ to 10 ⁹ Ω/□, preferably 10 ⁷ Ω/□ to 10 ⁹ Ω/□.

All. In more detail, the antistatic film 250 may be formed by curing a solution including the matrix material 252 , the carbon nanotubes 254 dispersed in the matrix material, a solvent, and a dispersion additive. By including the carbon nanotubes 254 dispersed in the matrix material 252 , heat resistance and reliability are improved. A more detailed description of the configuration of the antistatic film 250 will be described later.

The carbon nanotubes 254 dispersed over the entire surface of the antistatic film 250 have sp ² bonds between carbon and carbon, and thus exhibit very high rigidity and strength structurally, particularly, single-walled carbon nanotubes (SWCNTs). In the case of , a Young's modulus of 5.5 TPa and tensile strength of up to 45 GPa can be secured, making it a high-strength/ultra-light composite material.

The sheet resistance value of the carbon nanotubes 254 may be 1000Ω/□ to 20000Ω/□. In the case where the display device 200 is an in-cell touch type liquid crystal display device 200, when the sheet resistance value of the antistatic film 250 is too small (less than 10 ⁴ Ω/□), The voltage is discharged due to the antistatic film 250 , and this causes a problem in that the touch sensor cannot recognize the touch. Therefore, it is necessary to increase the sheet resistance value of the antistatic film 250, and accordingly, it is necessary to increase the sheet resistance value of the carbon nanotube 254 itself to implement a sheet resistance value of 1000Ω/□ to 20000Ω/□.

When the sheet resistance value of the carbon nanotubes 254 is less than 1000 Ω/□, the sheet resistance value of the antistatic film 250 is decreased, and accordingly, a problem of a decrease in touch sensitivity due to discharge occurs. On the other hand, when the sheet resistance value of the carbon nanotubes 254 is greater than 20000Ω/□, the sheet resistance value of the antistatic film 250 is excessively increased, so that the effect of discharging may be reduced.

The content of the carbon nanotubes 254 in the antistatic film 250 may be adjusted according to a design value for light transmittance. Since the light transmittance of the antistatic film 250 decreases as the content of the carbon nanotubes 254 increases, the content may be adjusted according to the light transmittance required for the product.

On the other hand, the sheet resistance value of the antistatic film 250 is uniformly formed over the entire surface, and specifically, the sheet resistance value may be 10 ⁴ Ω/□ to 10 ⁹ Ω/□, preferably 10 ⁷ Ω/□. □ to 10 ⁹ Ω/□. In the case where the display device 200 is an in-cell touch type liquid crystal display device 200, when the sheet resistance value of the antistatic film 250 is too small (less than 10 ⁴ Ω/□), The voltage is discharged due to the antistatic film 250 , and this causes a problem in that the touch sensor cannot recognize the touch. Therefore, the antistatic film 250 having a relatively high resistance value should be used. On the other hand, when the sheet resistance of the antistatic layer 250 is excessively large (more than 10 ⁹ Ω/□), although the touch sensitivity is excellent, the electrostatic discharge phenomenon is delayed, so that the effect of the discharge is reduced.

Accordingly, the sheet resistance value of the antistatic film 250 of the display device 200 according to the embodiment of the present invention should be in the range of 10 ⁴ Ω/□ to 10 ⁹ Ω/□, and accordingly, the display device 200 reduces static electricity. It has the effect of suppressing defects caused by static electricity by easily discharging to the outside, and at the same time preventing a decrease in touch sensitivity.

Meanwhile, one end of the antistatic layer 250 is connected to the edge of the lower substrate 220 of the display panel 205 through the conductive member 270 . Here, the conductive member 270 connects the antistatic layer 250 and the metal pad (or ground pad, not shown) of the lower substrate 220 of the display panel 205 . Specifically, the conductive member 270 covers the edge of the outer surface of the antistatic film 250 , and comes in contact with a metal pad (not shown) through the connection part 270 ′ to serve as a passage for discharging static electricity to the outside of the device. The conductive member 270 may be made of, for example, a metal material such as gold, silver, or copper.

Comparing this conductive member 270 with the first conductive member 170a, the conductive connection member 172, and the second conductive member 170b of the general display device 200 shown in FIG. 1, a single conductive member ( 270), so the number of processes is reduced and the process time is shortened, thereby reducing the manufacturing cost.

However, it should be noted that the shape or arrangement of the conductive member 270 of the display device 200 shown in FIGS. 2 and 3 is illustrated, for example, and embodiments are not limited thereto.

<First Experimental Example>

Hereinafter, with reference to the accompanying tables and graphs, the effect of the embodiment of the present invention will be described.

5A is a table showing the sheet resistance value and the sheet resistance uniformity of the antistatic film with respect to the sheet resistance of the carbon nanotubes according to the embodiment, and FIG. 5B is a graph showing the sheet resistance uniformity of FIG. 5A .

Referring to FIG. 5A , it can be seen that the sheet resistance uniformity of the antistatic film is improved from 17.32% to 6.67% as the sheet resistance value of the carbon nanotube itself is increased from 477Ω/□ to 1800Ω/□. In other words, it means that the deviation of the sheet resistance value for each region in the antistatic film is reduced.

As described above, in the case where the display device is an in-cell type liquid crystal display device, in order to maintain touch sensitivity and simultaneously perform a discharge function, the range of the sheet resistance value of the antistatic film is 10 ⁴ Ω/□ to 10 ⁹ Ω. It should be /□.

However, in the case of sample 1 (Sample 1), the sheet resistance value is formed in a large range of ^{10 7.4 Ω/□ to 10 10. 5 Ω / □} , and in the case of sample 2 (Sample 2), the sheet resistance It can be seen that the value is formed in a large range of 10 ^7.7 Ω/□ to 10 ^{10. 1} Ω/□. Accordingly, in Sample 1 and Sample 2, the variation of the sheet resistance is large for each region, and the discharge function is deteriorated in the region where the sheet resistance value is excessively large.

On the other hand, as can be seen in Sample 4, when the sheet resistance value of the carbon nanotube is formed as 1800Ω/□, the sheet resistance value is formed from 10 ^{7. 7} Ω/□ to 10 ^{8. 8} Ω/□, It is possible to perform the function of discharging while maintaining the touch sensitivity.

A graph regarding the sheet resistance uniformity of the antistatic film is shown in FIG. 5B . From Sample 1 to Sample 4, it can be seen that the self-resistance value of the carbon nanotube increases, and thus the sheet resistance uniformity is improved.

6 is a graph showing the sheet resistance value of the antistatic film with respect to the content of carbon nanotubes according to the embodiment.

Referring to FIG. 6 , the first line L1 represents the sheet resistance value of the antistatic layer of the general display device, and the second line L2 represents the sheet resistance value of the antistatic layer of the display device according to the embodiment. Also, the display device of FIG. 6 is an in-cell type liquid crystal display device.

Examining region ^A in the first line L1, it can be seen that the slope is very sharp near the sheet resistance value of the antistatic film, which is the antistatic film, which can perform the function of discharging while maintaining touch sensitivity. This means that the sheet resistance value of the antistatic film can be greatly changed even with a slight change in the content of carbon nanotubes, in other words, the sheet resistance value uniformity is formed to be relatively low.

On the other hand, examining the B region of the second line L2, it can be seen that the slope of the antistatic film is very gentle when the sheet resistance value is around 10 ⁸ Ω/□. This means that even if there is a change in the content of carbon nanotubes, since the uniformity of the sheet resistance value is relatively high, the change in the sheet resistance value is minute. Accordingly, the display device according to the embodiment maintains the touch sensitivity even when the content of carbon nanotubes is changed, and at the same time has the effect of smoothly performing the antistatic function.

7 is a table showing light transmittance with respect to a content of carbon nanotubes and a sheet resistance value according to an embodiment.

Referring to FIG. 7 , the content and sheet resistance value of carbon nanotubes according to the design value of the light transmittance can be seen. Specifically, in the case of a display device requiring 100% light transmittance, 0.13% of carbon nanotubes may be included, and a sheet resistance value of the carbon nanotubes may be designed to be 1800 Ω/□. In addition, in the case of a display device requiring a light transmittance of 99% or more, 0.26% of carbon nanotubes may be included, and a sheet resistance value of the carbon nanotubes may be designed to be 5000Ω/□.

Here, as shown in FIG. 7 , if the touch sensitivity is maintained and the sheet resistance value of the antistatic film capable of smoothly performing the discharge function is maintained, the light transmittance is adjusted by adjusting the carbon nanotube content and sheet resistance value. it can be seen that

8A is a graph showing a change in the sheet resistance value of a general antistatic film with time, and FIG. 8B is a graph showing a change in the sheet resistance value of the antistatic film in a high temperature and high humidity environment.

FIG. 8A shows the change in sheet resistance of the antistatic film with time in an environment at 95° C. in which the antistatic film is made of a PEDOT:PSS conductive polymer material. Referring to the graph, it can be seen that the sheet resistance value continues to increase over time. Specifically, it can be seen that when the initial sheet resistance value is set to approximately 8.5Ω/□, the value rises to 9.7Ω/□, and when the initial sheet resistance value is set to approximately 8.0Ω/□, the value rises to 9.2Ω/□. have.

On the other hand, referring to FIG. 8B , in the case of the antistatic film according to the embodiment, when the antistatic film having an initial sheet resistance value of about 8Ω/□ was exposed at 105° C. for 1500 hours, it was found that there was little change in the sheet resistance value. can This is also the case when the antistatic film is exposed to a high humidity (or high humidity) environment.

Accordingly, it can be seen that the antistatic film according to the embodiment has superior heat resistance and reliability compared to a general antistatic film.

9 is a graph comparing the weight % according to the temperature of a general antistatic film and the weight % according to the temperature of the antistatic film according to the embodiment.

Referring to FIG. 9 , results of analysis of the general antistatic film and the antistatic film according to the embodiment by a thermogravimetric analyzer (TGA) can be seen. A thermogravimetric analyzer is a device that measures the change in mass of a sample as a function of temperature by applying heat to the sample.

In the case of an antistatic film of a general display device, it can be seen that PEDOT:PSS, a conductive polymer included in the antistatic film, is all lost by heat at a temperature of approximately 500°C. On the other hand, in the case of the antistatic film included in the display device according to the embodiment, it can be seen that the carbon nanotubes remain without being lost up to about 900°C.

Therefore, it can be seen that the antistatic film according to the embodiment has excellent heat resistance compared to a general antistatic film.

In summary, when the display device is a liquid crystal display device including a touch function, it has a sheet resistance value of 10 ⁴ Ω/□ to 10 ⁹ Ω/□, and is formed by the antistatic film 250 having a uniform sheet resistance value over the entire surface. , the display device easily discharges static electricity generated during the manufacturing process to the outside to suppress defects caused by static electricity, prevent a decrease in touch sensitivity, improve sheet resistance uniformity, heat resistance and reliability, and reduce manufacturing costs. have

<Second embodiment>

Hereinafter, a carbon nanotube dispersion composition for preparing the antistatic film according to the first embodiment of the present invention described above, a conductive coating liquid composition including the same will be described.

10 is a reaction scheme showing the sol reaction of the alkoxysilane compound of the present invention.

The present invention relates to a carbon nanotube dispersion composition and a conductive coating liquid composition comprising the same, and more specifically, to a carbon nanotube dispersion composition comprising the same, and more particularly, by including carbon nanotubes, polyacrylic acid resin, and a straight-chain alkanol having 2 to 5 carbon atoms. Stability after acidity and dispersion can be significantly improved, and when used in a conductive coating liquid composition together with silane sol, a coating film having excellent chemical stability and electrical conductivity can be formed, and the uniformity of the formed coating film can be improved.

<Carbon nanotube dispersion composition>

The carbon nanotube dispersion composition according to the present invention includes carbon nanotubes, a polyacrylic acid resin, and a linear alkanol having 2 to 5 carbon atoms.

carbon nanotube

Carbon nanotube is a material with excellent conductivity, and when a coating film is formed with it, not only exhibits excellent electrical conductivity, but also mechanical strength can be secured, so it can be variously applied to conductive layers, antistatic films, etc. in electronic products such as display devices. can

The carbon nanotubes (CNTs) may be manufactured by a conventional arc discharge method, a laser deposition method, a plasma chemical vapor deposition method, a vapor phase synthesis method, a thermal decomposition method, and the like, and then heat-treated. In the product prepared by the above synthesis method, carbon impurities such as amorphous carbon or crystalline graphite particles and catalyst transition metal particles are present together with the synthesized carbon nanotubes. For example, when manufactured by an arc discharge method, 15 to 30% by weight of carbon nanotubes, 45 to 70% by weight of carbon impurities, and 5 to 25% by weight of catalytic transition metal particles are included in 100% by weight of the product. When the carbon nanotubes containing impurities are used without a purification process as described above, the dispersibility and coating properties of the impregnating liquid are deteriorated, and it is difficult to properly express the unique properties of the carbon nanotubes. Therefore, in the present invention, carbon nanotubes in which impurities are removed as much as possible by heat treatment of a product manufactured by an arc discharge method are used.

Specifically, the product prepared by the above synthesis method is made in the form of a sheet or granules having an average diameter of 2 to 5 mm, and then put into a rotary reactor inclined at an angle of 1 to 5 ° downward with respect to the progress direction (horizontal basis), and , while heating the rotary reactor to 350 to 500 ℃ oxidizing gas is supplied at a rate of 200 to 500 cc / min with respect to 1 g of the above-injected product, and heat treatment is performed for 60 to 150 minutes. At this time, by rotating the inclined rotary reactor at a speed of 5 to 20 rpm, the product is dispersed and the contact surface area is maximized, and at the same time, it automatically moves in the moving direction to maximize the contact surface area with the oxidizing gas and to prevent local oxidation. heat-treated According to this method, the weight of the input product is reduced by 60 to 85%, thereby obtaining high-purity carbon nanotubes.

Carbon nanotubes containing 40 wt% or less, more preferably 25 wt% or less, of carbon impurities in a total of 100 wt% are good for dispersibility and stability as well as securing conductivity.

The carbon nanotubes may be single-walled carbon nanotubes, double-walled carbon nanotubes, or multi-walled carbon nanotubes, which may be used alone or in combination of two or more, and single-walled carbon nanotubes in terms of improving interaction with other components to be described later Carbon nanotubes are more preferable.

The content of the carbon nanotubes according to the present invention is not particularly limited, but may be, for example, from 0.05 to 20% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.1 to 20% by weight, based on the total weight of the dispersion composition. It may be 1% by weight. When included in the above content range, excellent dispersibility may be exhibited, and it is easy to secure electrical conductivity, scratch resistance, and transmittance of the coating film when formed into a coating film.

polyacrylic acid Suzy

The polyacrylic acid resin according to the present invention is a component serving as a dispersing agent for effectively dispersing carbon nanotubes. The polyacrylic acid resin is well soluble in a specific dispersion medium to be described later, and can be well combined with hydrophobic carbon nanotubes. In addition, the dispersibility of carbon nanotubes can be improved and re-aggregation can be prevented through the electrostatic repulsion between the carbon nanotube strands and the steric hindrance effect due to the intrinsic properties of the polymer chain.

The content of the polyacrylic acid resin according to the present invention is not particularly limited, but may be included in an amount of 0.02 to 40% by weight, preferably 0.05 to 10% by weight, more preferably 0.1 to 1% by weight, based on the total weight of the dispersion composition. may be included as When included in the above content range, by being dissolved in an appropriate range in the composition, the activity for dispersing the carbon nanotubes can be significantly improved.

The weight average molecular weight of the polyacrylic acid resin according to the present invention is not particularly limited, but may be, for example, 2,000 to 3,000,000, preferably 8,000 to 12,000. When it has a weight average molecular weight in the above range, it is easy to penetrate between the strands of carbon nanotubes and may have a steric hindrance effect suitable for re-aggregation. In addition, in the dispersion composition, the carbon nanotubes can be effectively dispersed because they can exist in a well-dissolved state in the dispersion medium.

The dispersion composition of the present invention may contain a small amount of water, and the polyacrylic acid resin may be included in the dispersion in the form of being dissolved or emulsified in water, but is not limited thereto.

carbon number 2 to 5 straight chain alkanol

The straight-chain alkanol having 2 to 5 carbon atoms according to the present invention is a dispersion medium for effectively dispersing carbon nanotubes, and as a hydrophilic alcohol solvent, it interacts with the polyacrylic acid resin described above to significantly improve the dispersion stability of carbon nanotubes. can In the case of using a branched chain alkanol rather than a straight chain as a dispersion medium, the solubility and stability of the polyacrylic acid resin in the dispersion medium are remarkably reduced, making it difficult to maintain the dispersion stability in an appropriate range, but it should not be interpreted as being limited thereto.

Specific examples of the linear alkanol having 2 to 5 carbon atoms according to the present invention include ethanol, n-propanol, n-butanol, n-pentanol, and the like, and preferably ethanol, n-propanol, n-butanol. and at least one of n-pentanol, more preferably n-propanol.

The content of the alkanol according to the present invention is not particularly limited, but, for example, may be included in an amount of 50 to 99.93% by weight, preferably 80 to 99% by weight, based on the total weight of the composition. When included within the above range, the viscosity of the dispersion can be kept low, the dispersion stability of the carbon nanotubes can be further improved, and when applied to the coating film, it can be effectively mixed with the binder component.

additional dispersant

The carbon nanotube dispersion composition according to the present invention may further include an additional dispersant if necessary, and the type of the additional dispersant is not particularly limited, but may be, for example, an acrylic block copolymer dispersant.

In the present invention, the acrylic block copolymer refers to a copolymer formed by a polymerization reaction of different acrylic monomers to form a block, and when each unit is A and B, it means a copolymer formed of AAAAAABBBBBB. The acrylic block copolymer dispersant may further improve dispersion stability by separation of polarity of carbonyl groups in the copolymer. In addition, preferably, in the acrylic block copolymer, at least one functional group such as an amine group or a carboxyl group may be included in each unit, and by controlling the content of the unit containing the substituent, the hydrophilicity and hydrophobic component ratio are adjusted, so that carbon nano The dispersibility of the tube can be further improved. Specific commercially available examples of the acrylic copolymer dispersant include a polymer dispersant of DISPERBYK 2001 or DISPERBYK 2155 manufactured by BYK.

The content of the additional dispersant is not particularly limited, but may be included in an amount of 0.1 to 2% by weight, preferably 0.5 to 1% by weight, based on the total weight of the composition. When included within the above range, it is possible to prevent a decrease in scratch resistance and an increase in viscosity due to the use of an additional dispersant, and effectively maintain dispersion stability.

The carbon nanotube dispersion composition according to the present invention may further include a trace amount of water if necessary. Water may be used to improve the solubility and dispersibility of the above-described components, for example, may be used as a solvent for improving the dispersion activity of the polyacrylic acid resin, but is not particularly limited thereto.

<Method for producing carbon nanotube dispersion composition>

A method for preparing a carbon nanotube dispersion composition including the above-described components will be described as follows.

First, a carbon nanotube, a polyacrylic acid resin, and a linear alkanol having 2 to 5 carbon atoms are mixed. The polyacrylic acid resin may be prepared and used in the form of a receiving nucleus before mixing, and the concentration of the aqueous solution is not particularly limited, but the solid content of the polyacrylic acid resin is 0.02 to 40% with respect to the total content of the carbon nanotube dispersion composition. good, and more preferably 20 to 30% by weight. Specific types and mixing contents of each component of the carbon nanotube dispersion composition are also the same as described above.

Next, after mixing each component of the carbon nanotube dispersion composition, high-pressure dispersion is performed at 1000 to 1800 bar. When the dispersion is performed under a high pressure of 1000 to 1800 bar, the carbon nanotubes can collide with an appropriate shear stress, and thus, the strands of the carbon nanotubes can be effectively dispersed, without aggregation of the carbon nanotubes in the composition. Evenly dispersed, the interaction with the polyacrylic acid resin and the alkanol can be effectively performed.

If the pressure during dispersion is less than 1000 bar, the energy delivered to the carbon nanotubes is low, so the dispersion effect may be significantly reduced. A problem of poor dispersion stability may occur. The injection pressure may be more preferably 1200 to 1600 bar, and in this case, the above-described effect may be further improved.

The dispersion may be performed by spraying the composition in the above-mentioned pressure range with a nozzle of a predetermined particle diameter, in this case, the diameter of the nozzle to which the composition is sprayed may be 50 μm to 400 μm, preferably 80 μm to 200 μm. can In addition, the dispersion may be performed simultaneously by connecting nozzles of different sizes in series or separately performed twice using each nozzle.

When using the nozzle in the above range, as described above, the process can be easily performed at a high pressure of 1,000 bar to 1,800 bar, so that dispersion can be made effectively.

The diameter and flow rate of the nozzle may be selected in an appropriate range to suit the pressure range.

In addition, a stirring process may be further performed before the high-pressure dispersion process, and in this case, the mixing of the composition may be optimized to further improve the high-pressure dispersion process efficiency.

<Conductive coating solution composition>

Hereinafter, with respect to 100 parts by weight of the aforementioned carbon nanotube dispersion composition, a conductive coating composition comprising 10 to 100 parts by weight of silane sol will be described.

Carbon nanotube dispersion composition

The carbon nanotube dispersion composition may have the same components and contents as described above, and as described above, one prepared by high-pressure dispersion may be used.

Silanzole

The silane sol according to the present invention serves as a binder in the coating solution composition, and may include an alkoxysilane compound, an acid catalyst, an alcohol-based solvent, and water.

alkoxysilane compound

The alkoxysilane compound according to the present invention is a binder resin, and the type thereof is not particularly limited. For example, tetraalkoxysilane compounds such as tetraethoxysilane, tetramethoxysilane, tetra-n-propoxysilane; Methyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, ethyltrimethoxysilane, methyltripropoxysilane, methyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, isobutylt substituted or unsubstituted linear or branched alkyl alkoxysilanes such as ethoxysilane, isobutyltrimethoxysilane, octyltriethoxysilane, octyltrimethoxysilane and methacryloxydecyltrimethoxysilane; phenyltrimethoxysilane, phenyltriethoxysilane, phenyltripropoxysilane, phenyltributoxysilane; 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-aminoethyl-3-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-(n-butyl)-3-aminopropyltrimethoxysilane, 3-aminopropylmethyldiethoxysilane; Dimethyldimethoxysilane, diethyldiethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 3-mer captopropyltrimethoxysilane; Tridecafluoro-1,1,2,2-tetrahydrooctylpreethoxysilane, trifluoropropyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriisopropoxysilane, etc. of fluoroalkylsilane, and the like, and these may be used alone or in combination of two or more.

Among them, an alkylalkoxysilane compound having 1 to 20 carbon atoms in the alkyl group is most preferable, and more preferably, a tetraethoxysilane compound may be used.

The content of the alkoxysilane compound according to the present invention is not particularly limited, but may be included in an amount of 20 to 60% by weight, preferably 30 to 50% by weight, based on the total weight of the silane sol. When included in the above content range, the sol-gel reaction occurs well, the obtained silane sol has good physical properties, excellent adhesion, and easy to form a coating film, and is particularly suitable for coating on a glass substrate.

acid catalyst

The acid catalyst according to the present invention promotes hydrolysis of water and alkoxa silane and is for imparting an appropriate degree of crosslinking, and the type is not particularly limited, but for example, hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, acetic acid, diluted fluorine and hydrochloric acid, and these may be used alone or in a mixture of two or more, and the acid catalyst used may be included in the form of an aqueous solution upon mixing.

The content of the acid catalyst according to the present invention is not particularly limited, but may be included in an amount of 0.01 to 10% by weight, preferably 0.05 to 5% by weight, based on the total weight of the silane sol. When included in the above content range, it is possible to form a coating film with an appropriate degree of crosslinking.

alcohol solvent

The type of the alcohol-based solvent according to the present invention is not particularly limited, but it is preferable to use a hydrophilic alcohol-based solvent in terms of compatibility with the carbon nanotube dispersion, for example, methanol, ethanol, n-propanol, isopropanol, n -Butanol, isobutanol, sec-butanol, tert-butanol, n-amyl alcohol, isoamyl alcohol, sec-amyl alcohol, tert-amyl alcohol, 1-ethyl-1-propanol, 2-methyl-1-butanol, n -hexanol, cyclohexanol, etc. are mentioned, These can be used individually or in combination of 2 or more types. Among them, ethanol, n-butanol, n-propanol, n-pentanol, etc. are preferable from the viewpoint of improving stability with the carbon nanotube dispersion, and more preferably n-propanol can be used.

The content of the alcohol-based solvent according to the present invention is not particularly limited, but may be included in an amount of 10 to 70% by weight, preferably 20 to 50% by weight, based on the total weight of the silane sol. When included in the above content range, the reactivity of the sol-gel reaction may be further improved.

water

Water according to the present invention is a component that undergoes a hydrolysis reaction with an alkoxysilane, and its content is not particularly limited, but may be included in an amount of 5 to 60% by weight, preferably 8 to 35% by weight, based on the total weight of the silane sol. it is good to be When included in the above content range, sufficient hydrolysis may be made to have excellent adhesion to the substrate.

additive

The conductive coating liquid composition according to the present invention may further include an additive, if necessary, in addition to the carbon nanotube dispersion and silane sol described above.

The usable additives include, but are not limited to, a dispersant, a silane coupling agent, a leveling agent, a slip agent, a surfactant, a pH adjuster, a drying agent, a viscosity adjuster, and the like, and these may be used alone or in combination of two or more. can be used

As a more specific example, a slip agent may be further included to improve the slip property of the coating film, and the type of the slip agent is not particularly limited, but a commercially available example may include BYK's BKY 333, but is not limited thereto. In addition, the dispersant of BYK 2001 described above may be further used.

In addition, polar solvents such as ethylene glycol, dimethylformamide, and 1-methyl-2-pyrrolidone maximize dispersibility by increasing the repulsive force of the carboxyl group of the polyacrylic acid resin surrounding the carbon nanotubes in the dispersion, and through this, the state of the coating film It improves the electrical conductivity by improving the dispersion of carbon nanotubes, which are conductive fillers. In addition, they help to secure an appropriate viscosity during coating, and a uniform coating film can be realized by controlling the drying rate during coating to an appropriate range. In addition, the intrinsic dielectric constant of ethylene glycol, dimethylformamide, and 1-methyl-2-pyrrolidone can further improve conductivity, which is more suitable for implementing a low-resistance coating film.

The additional additives may be used alone or in mixture of two or more types, and the content thereof is not particularly limited, but may be included in an amount of 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the conductive coating solution composition. , when included in the above range, it is possible to implement the inherent effects of the above-described additives without impairing the effects of the present invention.

Preparation of Silansol

The silane sol according to the present invention can be prepared by reacting the above-mentioned components under predetermined conditions. After mixing the above-mentioned components, that is, an alkoxysilane compound, an alcohol-based solvent, an acid catalyst, water, an additive, and the like, and reacting under a predetermined condition, the alkoxysilane compound, for example, TESO, undergoes a sol reaction in an alcohol-based solvent.

Referring to FIG. 10 , hydrolysis and condensation reactions occur during the sol reaction of TESO, ethanol is generated in the hydrolysis reaction, and water is generated in the condensation reaction. The sol reaction of TEOS is accelerated according to the polarity of the solvent. That is, when the polarity of the solvent is high, the reaction rate is increased, and when the polarity of the solvent is low, the reaction rate is slowed. Here, stability can be maintained only when the TEOS is in a sol state, but if the sol reaction rate is fast, gelation proceeds and coating becomes difficult. Since ethanol has a high polarity of 5.9, the polarity of the solvent increases. The carbon nanotubes dispersed in the conductive coating liquid composition have hydrophobicity and are difficult to disperse in a polar solvent. Due to the ethanol generated during the sol reaction of TEOS, the dispersion properties of carbon nanotubes are deteriorated.

Therefore, in the present invention, a process of removing ethanol generated during the sol reaction of the alkoxysilane compound is performed. As a process for removing ethanol, rotary evaporation is used. Rotary evaporation is a method of distilling and removing an organic solvent by heating it to a boiling point at a constant pressure. In the present invention, when the sol reaction of the alkoxysilane compound is completed, the generated ethanol is removed by using a rotary evaporation method. Since the boiling point of ethanol is about 78°C, which is the lowest among the components included in the solution of the present invention, ethanol having the lowest boiling point can be removed first.

Then, the solvent is supplemented with the silane sol from which ethanol has been removed by rotary evaporation. When the ethanol produced from the silansol is removed, the total solvent content is reduced, so the solvent must be replenished as much as the ethanol is removed. A solvent with a lower polarity may be used as a solvent that can be supplemented with silanazole, and a solvent with a lower polarity than ethanol may be used. The solvent of the present invention may use a solvent having a polarity of 1.0 or more and less than 5.9, for example, n-propanol, butanol, acetonitrile, acetone, ethyl acetate, dichloromethane, chloroform, and the like.

The sol reaction conditions are not particularly limited, but, for example, may include a process of heating and stirring at 30 to 90° C., and the reaction time is not particularly limited, and may be performed for, for example, 4 to 30 hours. .

In addition, the reactor in which the reaction occurs may include a reflux cooling pipe. After the reaction, the product may be concentrated by rotary evaporation and diluted in a specific solvent. Accordingly, the prepared silane sol can secure excellent strength properties by imparting strong adhesion, particularly when a coating solution is applied to a glass substrate.

<Preparation of conductive coating liquid composition>

The conductive coating composition of the present invention may be prepared by mixing 10 to 100 parts by weight of a silane sol with respect to 100 parts by weight of the carbon nanotube dispersion composition.

When the content of the silane sol is included in less than 10 parts by weight at the time of mixing, it is difficult to secure the adhesion of the coating layer, and when mixed in excess of 100 parts by weight, the applicability of the coating layer may be deteriorated. In addition, the mixing ratio may be 25 to 60 parts by weight of silane sol, or 10 to 20 parts by weight of silane sol, based on 100 parts by weight of the carbon nanotube dispersion composition. When the silane sol is mixed in 25 to 60 parts by weight, it is suitable to implement a high resistance coating film, and when mixed in 10 to 20 parts by weight of the silane sol, it is suitable to implement a low resistance coating film.

The mixing method is not particularly limited, but may be performed using an ultrasonic disperser, a high-pressure disperser, a homogenizer, a mill, and the like, and preferably, when the same high-pressure dispersion process as in preparing the carbon nanotube dispersion is applied, the final coating solution Acidity and stability can be ensured.

<Display device>

A display device including an antistatic film formed of the aforementioned conductive coating liquid composition will be described. Hereinafter, the in-cell touch display device in the above-described embodiment of the present invention will be described in more detail.

11 and 12 are diagrams schematically illustrating a display device according to the present invention. 13 is a waveform diagram illustrating a common voltage Vcom and a touch driving signal Tdrv applied to the touch sensor Cs shown in FIG. 11 .

11 to 13 , the display device of the present invention includes a touch sensing device. The touch sensing device senses a touch input using the touch sensors Cs built into the display panel 300 . The touch sensing device may sense a touch input based on a change in capacitance of the touch sensor Cs because capacitance increases when a finger touches the self-capacitance type touch sensor Cs.

In the display panel 300 , a liquid crystal layer is formed between two substrates. The liquid crystal molecules are driven by an electric field generated by a potential difference between the data voltage applied to the pixel electrode 12 and the common voltage Vcom applied to the sensor electrode 13 . The pixel array of the display panel 300 includes pixels and pixels defined by data lines (S, S1 to Sm, m is a positive integer) and gate lines (G, G1 to Gn, n is a positive integer). and touch sensors (Cs) connected to them.

The touch sensor Cs includes a sensor electrode and a sensor wire M3 connected to the sensor electrode. The sensor electrodes COM and C1 to C4 may be patterned by dividing an existing common electrode. Each of the sensor electrodes COM and C1 to C4 overlaps a plurality of pixels. The sensor electrodes COM and C1 to C4 receive the common voltage Vcom during the display driving period Td through the sensor wiring M3 and supply the touch driving signal Tdrv during the touch sensor driving period Tt. receive The common voltage Vcom is commonly applied to the pixels through the sensor electrodes.

The sensor wirings M3 are disposed at the boundary between the sub-pixels while avoiding the position of the spacer. The sensor wirings M3 may overlap the data lines S1 to Sm with an insulating layer (not shown) interposed therebetween so that there is no problem of reducing the opening area of the pixels.

Since the touch sensors are embedded in the pixel array of the display panel 300 , the touch sensors Cs are connected to the pixels through parasitic capacitance. According to the present invention, in order to reduce the mutual influence due to the coupling between the pixels and the touch sensors Cs, a period of driving pixels for one frame period as shown in FIG. 13 (hereinafter referred to as a "display driving period") The display panel 300 is driven by time division into a period for driving the touch sensors (hereinafter, referred to as a “touch sensor driving period”). One frame period may be divided into one or more display driving periods Td and one or more touch sensor driving periods Tt. During the display driving period Td, the data of the input image is written to the pixels. During the touch sensor driving period Tt, the touch sensors are driven to sense a touch input.

Each of the pixels includes a pixel thin film transistor (TFT) formed at intersections of the data lines S1 to Sm and the gate lines G1 to Gn, a pixel electrode receiving a data voltage through the pixel TFT, and a common and a common electrode to which the voltage Vcom is applied, and a storage capacitor (Cst) connected to the pixel electrode to maintain the voltage of the liquid crystal cell.

A black matrix, a color filter, etc. may be formed on the upper substrate of the display panel 300 . The lower substrate of the display panel 300 may be implemented in a color filter on TFT (COT) structure. In this case, the color filter may be formed on the lower substrate of the display panel 100 . A polarizing plate is attached to each of the upper and lower substrates of the display panel 300 , and an alignment layer for setting a pretilt angle of the liquid crystal is formed on the inner surface in contact with the liquid crystal. A spacer for maintaining a cell gap of the liquid crystal layer is formed between the upper substrate and the lower substrate of the display panel 300 .

A backlight unit may be disposed under the rear surface of the display panel 300 . The backlight unit is implemented as an edge type or direct type backlight unit to irradiate light to the display panel 300 . The display panel 300 may be implemented in any known liquid crystal mode, such as a twisted nematic (TN) mode, a vertical alignment (VA) mode, an in plane switching (IPS) mode, and a fringe field switching (FFS) mode. In a self-light emitting display device such as an organic light emitting diode display, a backlight unit is not required.

The display device of the present invention further includes a display driver 302 , 304 , 306 for writing input image data to pixels, and a touch sensor driver 310 for driving the touch sensors Cs. The display drivers 302 , 304 , and 306 and the touch sensor driver 310 are synchronized with each other in response to the synchronization signal Tsync.

The display drivers 302 , 304 , and 306 write data to pixels during the display driving period Td. The pixels hold the data voltage charged in the previous display driving period Td because the TFT is in an off state during the touch sensor driving period Tt. The display drivers 302 , 304 , and 306 are applied to the touch sensors Cs to minimize parasitic capacitance between the touch sensors Cs and signal lines connected to the pixels during the touch sensor driving period Tt. An AC signal having the same phase as the touch driving signal Tdrv may be supplied to the signal lines S1 to Sm and G1 to Gn. Here, the signal lines connected to the pixels are the data line lines S1 to Sm and the gate lines G1 to Gn.

The display drivers 302 , 304 , and 306 include a data driver 302 , a gate driver 304 , and a timing controller 306 .

The data driver 302 converts digital video data (RGB, RGBW) of an input image received from the timing controller 306 during the display driving period Td into analog positive/negative gamma compensation voltages and outputs a data voltage. . The data voltage output from the data driver 302 is supplied to the data lines S1 to Sm. The data driver 302 may apply an AC signal having the same phase as the touch driving signal Tdrv applied to the touch sensors during the touch sensor driving period Tt to the data lines S1 to Sm. This is because the voltage across both ends of the parasitic capacitance changes at the same time, and the smaller the voltage difference, the smaller the amount of charge charged in the parasitic capacitance.

The gate driver 304 sequentially supplies a gate pulse (or scan pulse) synchronized with the data voltage to the gate lines G1 to Gn during the display driving period Td to write the data voltage to the display panel 300 . select the line of The gate pulse swings between the gate high voltage VGH and the gate low voltage VGL. The gate pulse is applied to the gates of the pixel TFTs through the gate lines G1 to Gn. The gate high voltage VGL is set to a voltage higher than the threshold voltage of the pixel TFT to turn on the pixel TFT. The gate low voltage VGL is a voltage lower than the threshold voltage of the pixel TFT. The gate driver 304 may apply an AC signal having the same phase as the touch driving signal Tdrv applied to the touch sensors during the touch sensor driving period Tt to the gate lines G1 to Gn.

The timing controller 306 receives timing signals such as a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a main clock input from the host system 308 , and receives the data driver 302 , the gate driver 304 , and the touch sensor. The operation timing of the driving unit 310 is synchronized. The scan timing control signal includes a gate start pulse (GSP), a gate shift clock (Gate Shift Clock), a gate output enable signal (Gate Output Enable, GOE), and the like. The data timing control signal includes a source sampling clock (SSC), a polarity control signal (Polarity, POL), and a source output enable signal (SOE).

The timing controller 306 transmits input image data RGB from the host system 308 to the data driver 302 . The timing controller 306 may convert RGB data into RGBW data using a well-known white gain calculation algorithm and transmit it to the data driver 302 .

The host system 308 may be implemented as any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 308 includes a system on chip (SoC) having a built-in scaler and converts digital video data of an input image into a format suitable for the resolution of the display panel 300 . The host system 308 transmits timing signals together with digital video data (RGB, RGBW) of the input image to the timing controller 306 . In addition, the host system 308 executes an application program associated with the coordinate information XY of the touch input input from the touch sensor driver 310 .

The timing controller 306 or the host system 308 may generate a synchronization signal Tsync for synchronizing the display drivers 302 , 304 , and 306 with the touch sensor driver 310 .

The touch sensor driver 310 generates the touch driving signal Tdrv during the touch sensor driving period Tt. The touch driving signal Tdrv is supplied to the sensor electrodes 13 and C1 to C4 through the sensor wiring M3 . The touch sensor driver 310 may detect a touch position and a touch area by measuring a change in capacitance of the touch sensor Cs. The touch sensor driver 310 calculates the coordinate information XY of the touch input and transmits it to the host system 308 .

The data driving circuit 12 and the touch sensor driving unit 310 may be integrated into one integrated circuit (IC).

14 is a cross-sectional view illustrating a cross-sectional structure of the display panel 300, and FIG. 15 is a flowchart illustrating a method of manufacturing a display device according to the present invention.

Referring to FIG. 14 , a lower plate of the display panel 300 includes a TFT array on a lower substrate SUBS1 . The upper plate of the display panel 300 includes a color filter array on the upper substrate SUBS2 . A liquid crystal layer LC is formed between the upper and lower plates of the display panel 300 .

A buffer insulating layer BUF, a semiconductor pattern ACT, and a gate insulating layer GI are formed on the lower substrate SUBS1 . A first metal pattern is formed on the gate insulating layer GI. The gate metal pattern includes a gate GE of the TFT and gate lines G1 to Gn connected to the gate GE. The interlayer insulating layer INT covers the second metal pattern. The source-drain metal pattern is formed on the interlayer insulating layer INT. The second metal pattern includes data lines S1 to Sm and a source SE and a drain DE of the TFT. The drain DE is connected to the data lines S1 to Sm. The source SE and the drain DE of the TFT are in contact with the semiconductor pattern ACT of the TFT through a contact hole penetrating the interlayer insulating layer INT.

The first passivation layer PAS1 covers the second metal pattern. A second passivation layer PAS2 is formed on the first passivation layer PAS1 . A contact hole exposing the source SE of the TFT is formed in the second passivation layer PAS2 . A third passivation layer PAS2 is formed on the second passivation layer PAS2 , and a third metal pattern is formed on the third passivation layer PAS3 . The third metal pattern includes the sensor wiring M3. The fourth passivation layer PAS4 is formed on the third passivation layer PAS3 to cover the third metal pattern. A fourth metal pattern is formed on the fourth passivation layer PAS4 . The fourth metal pattern includes a sensor electrode 13 (COM) formed of a transparent electrode material such as Indium-Tin Oxide (ITO). The fifth passivation layer PAS5 is formed on the fourth passivation layer PAS4 to cover the fourth metal pattern. The first, third, fourth, and fifth passivation layers PAS1 , PAS3 , PAS4 , and PAS5 may be formed of an inorganic insulating material such as SiOx or SiNx. The second passivation layer PAS2 may be formed of an organic insulating material such as photo-acryl.

The third, fourth, and fifth passivation layers PAS1 , PAS3 , PAS4 , and PAS5 are patterned to include contact holes exposing the source SE of the TFT. A fifth metal pattern is formed on the fifth passivation layer PAS5 . The fifth metal pattern includes a pixel electrode 12 (PXL) formed of a transparent electrode material such as ITO. The alignment layer ALM is formed on the fifth passivation layer PAS5 to cover the fifth metal pattern.

A black matrix BM and a color filter CF are formed on the upper substrate SUBS2 , and a planarization layer OC is formed thereon. The planarization layer OC may be formed of an organic insulating material. Although not shown, a spacer is formed between the upper substrate and the lower substrate to maintain a cell gap of the liquid crystal layer.

An antistatic layer 250 of the present invention is formed on the upper substrate SUBS2 . The antistatic film 250 according to the present invention exhibits excellent electrical conductivity, and also has excellent mechanical strength and transmittance, so that it can be used as an antistatic coating film for touch screen panels and display devices.

A method of manufacturing a display device of the present invention will be described with reference to FIG. 15 as follows. First, the conductive coating solution composition described above is prepared. (S1) The conductive coating solution composition is formed by mixing a carbon nanotube dispersion composition and a silane sol. A detailed description of the conductive coating liquid composition is omitted since it has been described above.

An antistatic film is prepared by coating the conductive coating liquid composition prepared on the upper surface of the display panel as described above. (S2) The method of forming the antistatic film is not particularly limited, but one formed by applying and curing the conductive coating liquid composition according to the present invention. can The method for applying the conductive coating liquid composition is not particularly limited, but slit coating method, knife coating method, spin coating method, casting method, micro gravure coating method, gravure coating method, bar coating method, roll coating method, wire bar coating method, dip A coating method, a spray coating method, a screen printing method, a gravure printing method, a flexographic printing method, an offset printing method, an inkjet coating method, a dispenser printing method, a nozzle coating method, a known method such as a capillary coating method can be used. After application, the antistatic film can be formed by curing the coating film through a drying process at a predetermined temperature.

Then, an upper polarizing plate is attached to the display panel on which the antistatic film is formed. (S3) Then, a lower polarizing plate is attached to the lower surface of the opposite display panel to which the upper polarizing plate is attached to manufacture a display device. (S4)

Hereinafter, preferred embodiments are presented to help the understanding of the present invention, but these examples are merely illustrative of the present invention and do not limit the appended claims, and are within the scope and spirit of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible, and it is natural that such variations and modifications fall within the scope of the appended claims.

<Second Experimental Example>

Hereinafter, an experimental example of forming an antistatic film using the aforementioned carbon nanotube dispersion and a conductive coating liquid composition including the same will be disclosed.

Experiment 1: Conductive coating liquid composition and prepared therefrom of the coating film (antistatic film) Characteristic measurement

Example One

<Preparation of carbon nanotube dispersion>

Carbon nanotubes (SA100, Nanosolution Co., Ltd.) synthesized by arc discharge method were used in a rotary kiln rotational reactor with an inclination angle of 3° at a rotation speed of 5-20rpm, a temperature of 420°C, and an oxidizing gas of 250cc/min. A carbon nanotube A having a carbon impurity content of 15% was used by heat treatment for 100 minutes at a feed rate.

Then, 0.15 parts by weight of carbon nanotube A, polyacrylic acid resin aqueous solution (solid content 25%/ polyacrylic acid resin Mw = (250,000)) 0.24 parts by weight, acrylic block copolymer (brand name DISPERBYK2001 acid value 19mg KOH/g, amine value 29mg KOH/g ) 0.23 parts by weight and 99.61 parts by weight of n-propanol were mixed, and dispersed at a pressure of 1500 bar using a sprayer having a nozzle diameter of 100 μm to prepare a carbon nanotube dispersion.

<Preparation of silane sol>

21.7 parts by weight of n-propanol and 62.6 parts by weight of TEOS were put into a reactor equipped with a reflux tube, stirred at 300 rpm at room temperature (25° C.) using a stirrer for 30 minutes, 15.2 parts by weight of water was stirred at 500 rpm, and then 3.5% aqueous hydrochloric acid solution 0.5 A weight part was dripped gradually.

<Conductive coating solution composition>

33 parts by weight of binder, 0.95 parts by weight of BYK2001, and 0.05 parts by weight of BYK333 as a surface slip agent were added to 66 parts by weight of the prepared carbon nanotube dispersion solution, and the process of passing a 100 μm nozzle under 1500 atm using a high pressure disperser was performed 5 times to perform the coating solution was prepared, and at this time, a cooling device was used so that the temperature of the liquid did not rise.

Example 2 ( dispersion medium different types)

A conductive coating composition was prepared in the same manner as in Example 1, except that ethanol was used as a dispersion medium when preparing the carbon nanotube dispersion.

Example 3 ( dispersion medium different types)

A conductive coating composition was prepared in the same manner as in Example 1, except that butanol was used as a dispersion medium when preparing the carbon nanotube dispersion.

Example 4 ( dispersion medium different types)

A conductive coating composition was prepared in the same manner as in Example 1, except that pentanol was used as a dispersion medium when preparing the carbon nanotube dispersion.

Example 5 ( PAA's When the weight average molecular weight is different)

A conductive coating composition was prepared in the same manner as in Example 1, except that the polyacrylic acid resin having a weight average molecular weight of 1,250,000 was used in preparing the carbon nanotube dispersion.

Example 6 ( BYK 2155 is used)

A conductive coating composition was prepared in the same manner as in Example 1, except that DISPERBYK 2155 was used instead of DISPERBYK 2001 when preparing the carbon nanotube dispersion.

Example 7 (in case of different injection pressure)

A conductive coating composition was prepared in the same manner as in Example 1, except that the carbon nanotube dispersion was sprayed at a pressure of 1000 bar.

Example 8 (in case of different injection pressure)

A conductive coating composition was prepared in the same manner as in Example 1, except that the carbon nanotube dispersion was sprayed at a pressure of 1800 bar.

Example 9 (Spray nozzle diameter if different)

A conductive coating composition was prepared in the same manner as in Example 1, except that the carbon nanotube dispersion was sprayed using a nozzle having a diameter of 500 μm.

Example 10 (Spray nozzle diameter if different)

A conductive coating composition was prepared in the same manner as in Example 1, except that the carbon nanotube dispersion was sprayed using a nozzle having a diameter of 300 μm.

Example 11

14 parts by weight of binder, 0.95 parts by weight of BYK 2001, 5 parts by weight of ethylene glycol, and 0.05 parts by weight of BYK 333 as a surface slip agent were put into 80 parts by weight of the prepared carbon nanotube dispersion, and passed through a 100 μm nozzle under 1500 atm using a high pressure disperser. This process was performed 5 times to prepare a coating solution, and a cooling device was used to prevent the temperature of the solution from rising.

comparative example One ( dispersion medium kind outside the scope of the present invention)

A conductive coating composition was prepared in the same manner as in Example 1, except that isopropanol was used as a dispersion medium when preparing the carbon nanotube dispersion.

comparative example 2 (as a dispersant PAA instead sodium dodecylsulfonate if used)

A conductive coating composition was prepared in the same manner as in Example 1, except that an aqueous sodium dodecylsulfonate solution was used instead of an aqueous polyacrylic acid solution when preparing the carbon nanotube dispersion.

comparative example 3 (when isopropanol is used and the injection pressure is outside the scope of the present invention)

A conductive coating composition was prepared in the same manner as in Comparative Example 1, except that the carbon nanotube dispersion was sprayed at a pressure of 900 bar.

comparative example 4 (when isopropanol is used and the injection pressure is outside the scope of the present invention)

A conductive coating composition was prepared in the same manner as in Comparative Example 1, except that the carbon nanotube dispersion was sprayed at a pressure of 2000 bar.

Test Methods

(1) Dispersibility evaluation

In order to evaluate the carbon nanotube dispersion composition prepared according to Examples and Comparative Examples, the zeta potential was measured and evaluated according to the following evaluation criteria.

<Evaluation criteria>

○: When the absolute value exceeds 25mV

△: when the absolute value is in the range of 10 to 25 mV

Ⅹ: When the absolute value is less than 10mV

(2) Evaluation of dispersion stability

Whether the carbon nanotube dispersion composition prepared according to Examples and Comparative Examples was put into a glass bottle and aggregated at room temperature for 30 days was evaluated according to the following evaluation criteria.

<Evaluation criteria>

○: Aggregation occurred after 14 days

△: Aggregation occurred after 7 days

X: Aggregation occurred within 2 days

(3) coatability evaluation

After applying the conductive coating solution composition prepared according to Examples and Comparative Examples on a glass substrate using a spin coater at 400 rpm for 15 seconds, and then drying at 140° C. for 10 minutes using a hot plate, a hot air dryer was used. Further drying was performed for 30 minutes using a conductive coating film. The uniformity of the formed coating film was visually observed and evaluated according to the following evaluation criteria.

<Evaluation criteria>

○: When there is no pinhole

△: When there are less than two pinholes

Ⅹ: When there are two or more pinholes

(4) Surface resistivity evaluation

After applying the conductive coating solution composition prepared according to Examples and Comparative Examples on a glass substrate using a spin coater at 400 rpm for 15 seconds, and then drying at 140° C. for 10 minutes using a hot plate, a hot air dryer was used. Further drying was performed for 30 minutes using a conductive coating film. The surface resistivity of the formed coating film was measured using a surface resistance specifier. At this time, the measurement of the surface resistivity was performed by a 4-point probe method, the coating film was divided into thirds in the longitudinal direction, and measured at the center portion.

(5) Permeability

After applying the conductive coating solution composition prepared according to Examples and Comparative Examples on a glass substrate using a spin coater at 400 rpm for 15 seconds, and then drying at 140° C. for 10 minutes using a hot plate, a hot air dryer was used. Further drying was performed for 30 minutes using a conductive coating film. Transmittance of the formed coating film was measured at 550 nm using a spectrophotometer, and the transmittance of 90.5% of the glass substrate on which the coating film was not formed was evaluated according to the following evaluation criteria.

<Evaluation criteria>

○: 89.5 ≤ transmittance (%)

△: 87.5≤ transmittance (%) < 89.5

X: Transmittance (%) < 87.5

(6) scratch resistance

After applying the conductive coating solution composition prepared according to Examples and Comparative Examples on a glass substrate using a spin coater at 400 rpm for 15 seconds, and then drying at 140° C. for 10 minutes using a hot plate, a hot air dryer was used. Further drying was performed for 30 minutes using a conductive coating film. The surface of the formed coating film was measured using a pencil hardness tester (221-D, Yoshimitsu Corporation).

<Evaluation criteria>

○: 8-9H

△: 6-7H

X: ~5 H

Dispersion properties, coating properties, surface resistivity, transmittance and scratch resistance of the coating films prepared according to the above-described Examples and Comparative Examples were measured and shown in Table 1 below. In Table 1 below, ○ indicates excellent, △ indicates good, and X indicates poor.

Dispersion Characteristics coatability Surface resistivity (Ω/□) Transmittance (%)
my
scratchability dispersibility dispersion stability Example 1 ○ ○ ○ 10 ^8.0 ○ ○ Example 2 ○ ○ ○ 10 ^8.0 ○ ○ Example 3 ○ ○ ○ 10 ^8.2 ○ ○ Example 4 ○ △ ○ 10 ^8.7 ○ ○ Example 5 ○ ○ ○ 10 ^8.2 ○ ○ Example 6 ○ ○ ○ 10 ^8.1 ○ ○ Example 7 ○ ○ ○ 10 ^8.1 ○ ○ Example 8 ○ △ ○ 10 ^8.3 ○ ○ Example 9 ○ △ ○ 10 ^8.1 ○ ○ Example 10 ○ △ ○ 10 ^8.3 ○ ○ Example 11 ○ ○ ○ 10 ^5.0 ○ ○ Comparative Example 1 △ X △ 10 ^8.2 ○ ○ Comparative Example 2 X X X 10 ^9.4 X △ Comparative Example 3 △ X △ 10 ^8.3 ○ △ Comparative Example 4 △ X △ 10 ^8.5 ○ ○

Referring to Table 1, Examples 1 to 3 in which propanol, ethanol, and butanol were used as solvents in the preparation of the carbon nanotube dispersion were excellent in dispersibility, dispersion stability, coating property, transmittance and scratch resistance, and the surface The resistivity was 10 ^8.0 , 10 ^8.0 and 10 ^8.2 (Ω/□), respectively. Example 4 showed excellent dispersibility, coating property, transmittance and scratch resistance, and good dispersion stability, and a surface resistivity of 10 ^8.7 .

In addition, Example 5 using a polyacrylic acid resin having a weight average molecular weight of 1,250,000 and Example 6 using DISPERBYK 2155 when preparing a carbon nanotube dispersion showed excellent dispersibility, dispersion stability, coating property, transmittance and scratch resistance and the surface resistivity was 10 ^8.2 and 10 ^8.1 (Ω/□), respectively.

In addition, Example 7 sprayed at a pressure of 1000 bar during the preparation of the carbon nanotube dispersion showed excellent dispersibility, dispersion stability, coating property, transmittance and scratch resistance, and the surface resistivity was 10 ^8.1 (Ω/□). . And, Example 8 sprayed at a pressure of 1800 bar showed excellent dispersibility, coating property, transmittance and scratch resistance, except that dispersion stability was shown to be good, and the surface resistivity was 10 ^8.3 (Ω/□). .

In addition, when preparing the carbon nanotube dispersion, Examples 9 and 10 sprayed using nozzles with diameters of 500 μm and 300 μm, respectively, showed surface resistivity of 10 ^8.1 and 10 ^8.3 (Ω/□), respectively, and dispersion stability was excellent. Dispersibility, coating property, transmittance and scratch resistance were found to be excellent, except for those indicated as good.

In addition, Example 11 prepared differently with 14 parts by weight of the binder, 0.95 parts by weight of BYK 2001 and 5 parts by weight of ethylene glycol to 80 parts by weight of the carbon nanotube dispersion had a surface resistivity of 10 ^5.0 (Ω/□), and dispersibility, It was found to be excellent in dispersion stability, coating properties, permeability and scratch resistance.

On the other hand, Comparative Example 1 using isopropanol as a dispersion medium when preparing a carbon nanotube dispersion had a surface resistivity of 10 ^8.2 (Ω/□), excellent transmittance and scratch resistance, and good dispersibility and coating properties. However, the dispersion stability was found to be poor.

In addition, Comparative Example 2, in which an aqueous sodium dodecylsulfonate solution was used instead of an aqueous polyacrylic acid solution when preparing a carbon nanotube dispersion, had a surface resistivity of 10 ^9.4 (Ω/□) and had good scratch resistance, but dispersibility and dispersion Stability, coating properties and transmittance were found to be poor.

In addition, Comparative Examples 3 and 4 using isopropanol to prepare carbon nanotube dispersions and spraying at 900 bar and 2000 bar, respectively, showed surface resistivity of 10 ^8.3 and 10 ^8.5 (Ω/□), respectively, and excellent transmittance. However, dispersibility and coating properties were found to be good, and dispersion stability was found to be poor. And, the scratch resistance of Comparative Example 3 was good, and the scratch resistance of Comparative Example 4 was excellent.

Through this result, it can be confirmed that the coating film prepared according to the manufacturing process of the carbon nanotube dispersion of the present invention is excellent in dispersibility, dispersion stability, coatability, surface resistivity, transmittance and scratch resistance.

Experiment 2: Measurement of properties of conductive coating liquid composition and antistatic film prepared therefrom

Example 12

32.95 parts by weight of TEOS sol binder and 0.05 parts by weight of additives were added to 67 parts by weight of the carbon nanotube dispersion of Example 1, and the process of passing a nozzle of 100 μm under 1500 atm using a high pressure disperser was performed 5 times. A conductive coating solution was prepared. Here, the TEOS sol binder was prepared by removing ethanol by rotary evaporation at 25° C. 40 mmHg for 1 hour and supplementing n-propanol as much as the removed ethanol.

Comparative Example 5

Under the same process conditions as in Example 12, a conductive coating solution was prepared without performing rotary evaporation on the TEOS sol binder.

The viscosity of the conductive coating solution composition prepared according to Example 12 and Comparative Example 5 was measured at the initial stage and after 7 days, and the coating film was prepared using the conductive coating solution composition, and the surface resistance of the coating film was measured at the initial stage and after 7 days. Table 2 shows.

Surface resistance (Ω/□) Viscosity (cp) Early after 7 days amount of change Early after 7 days amount of change Example 12 8.1 7.5 -0.6 3.51 4.29 0.78 Comparative Example 5 8.1 7 -1.1 3.54 4.54 One

Referring to Table 2, in Example 12, in which the rotary evaporation method was performed during the preparation of the TEOS sol, the viscosity change at the initial stage and after 7 days of the composition was 0.78, and the surface resistance change at the initial stage and after 7 days of the coating film was -0.6 appeared as On the other hand, in Comparative Example 5, in which the rotary evaporation method was not performed during the preparation of the TEOS sol, the viscosity change at the initial stage and after 7 days of the composition was 1, and the change in the surface resistance of the coating film at the beginning and after 7 days was -1.1. That is, compared with Comparative Example 5, the change in the viscosity of Example 12 was as small as 0.22, and the change in the surface resistance was as small as -0.5.

Through these results, Example 12, in which ethanol was removed using rotary evaporation during the preparation of the silane sol, had a small change in the surface resistance of the coating film and a small change in viscosity compared to Comparative Example 5 in which ethanol was not removed.

Therefore, the present invention has the advantage of improving the storage stability of the conductive coating liquid composition at room temperature and maintaining the surface resistance properties of the coating film by removing ethanol using the rotary evaporation method during the preparation of the silane sol.

As described above, the conductive coating liquid composition of the present invention can prevent changes in surface resistance and viscosity when stored at room temperature. Therefore, the conductive coating liquid composition of the present invention can improve storage stability at room temperature.

The antistatic film formed of the conductive coating liquid composition according to the present invention exhibits excellent electrical conductivity and also has excellent mechanical strength and transmittance, so that it can be used as an antistatic coating film for touch screen panels and image display devices.

The antistatic film according to the present invention and a display device including the same can easily discharge static electricity generated during a manufacturing process to the outside, thereby suppressing defects caused by static electricity, preventing a decrease in touch sensitivity, and providing uniformity of sheet resistance, heat resistance and reliability. can be improved and the manufacturing cost can be reduced.

Terms such as "include", "compose" or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so it does not exclude other components. It should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning in the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

210a: lower polarizing plate 210b: upper polarizing plate
220: lower substrate 230: cell
240: upper substrate 250: antistatic film

Claims (14)

forming a silane sol by mixing an alkoxysilane compound, an alcohol-based solvent, and water to react the alkoxysilane compound with a sol, and then removing ethanol generated during the sol reaction;
forming a carbon nanotube dispersion composition;
preparing a conductive coating composition by mixing the carbon nanotube dispersion composition with the silane sol; and
Comprising the step of coating the conductive coating liquid composition on a substrate,
The step of forming the carbon nanotube dispersion composition comprises spraying the carbon nanotube dispersion composition under a pressure of 1000 bar to 1800 bar using a sprayer. The method of claim 1,
The ethanol is a method of manufacturing an antistatic film that is removed using a rotary evaporation method. The method of claim 1,
An additional solvent corresponding to the amount of the removed ethanol is added, wherein the additional solvent has a polarity of 1.0 to less than 5.9. The method of claim 1,
The carbon nanotube dispersion composition is a method of producing an antistatic film comprising 0.05 to 20% by weight of carbon nanotubes, 0.02 to 40% by weight of polyacrylic acid resin, and 50 to 99% by weight of a linear alkanol having 2 to 5 carbon atoms. The method of claim 1,
Based on the total weight of the silane sol, 20 to 60% by weight of an alkoxysilane compound, 10 to 70% by weight of an alcohol-based solvent, and 5 to 60% by weight of water. The method of claim 1,
The conductive coating solution composition is a method for producing an antistatic film comprising 10 to 100 parts by weight of the silane sol based on 100 parts by weight of the carbon nanotube dispersion composition. forming an antistatic film on the display panel;
attaching an upper polarizing plate on the antistatic film; and
Including; attaching a lower polarizing plate to the lower portion of the display panel;
The step of forming the antistatic film,
forming a silane sol by mixing an alkoxysilane compound, an alcohol-based solvent, and water to react the alkoxysilane compound with a sol, and then removing ethanol generated during the sol reaction;
forming a carbon nanotube dispersion composition;
preparing a conductive coating composition by mixing the carbon nanotube dispersion composition with the silane sol; and
and coating the conductive coating solution composition on the display panel,
The forming of the carbon nanotube dispersion composition includes spraying the carbon nanotube dispersion composition under a pressure of 1000 bar to 1800 bar using a sprayer. 8. The method of claim 7,
A method of manufacturing a display device wherein the ethanol is removed using a rotary evaporation method. 8. The method of claim 7,
An additional solvent corresponding to the amount of the removed ethanol is added, wherein the additional solvent has a polarity of 1.0 to less than 5.9. 8. The method of claim 7,
The carbon nanotube dispersion composition comprises 0.05 to 20% by weight of carbon nanotubes, 0.02 to 40% by weight of polyacrylic acid resin, and 50 to 99% by weight of a linear alkanol having 2 to 5 carbon atoms. 8. The method of claim 7,
A method of manufacturing a display device comprising 20 to 60% by weight of an alkoxysilane compound, 10 to 70% by weight of an alcohol-based solvent, and 5 to 60% by weight of water, based on the total weight of the silane sol. 8. The method of claim 7,
The method for manufacturing a display device, wherein the conductive coating composition includes 10 to 100 parts by weight of the silane sol based on 100 parts by weight of the carbon nanotube dispersion composition. 5. The method of claim 4,
The carbon nanotube dispersion composition further comprises 0.1 to 2% by weight of an additional dispersant,
The additional dispersant is an acrylic block copolymer, a method for producing an antistatic film. 11. The method of claim 10,
The carbon nanotube dispersion composition further comprises 0.1 to 2% by weight of an additional dispersant,
The method of manufacturing a display device wherein the additional dispersant is an acrylic block copolymer.

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