KR20070000629A - Column spacer for controlling cell gap and liquid crystal display device using the same - Google Patents

Abstract

A column spacer for controlling cell gap and an LCD using the same are provided to make the cell gap uniform, thereby preventing various defects due to defective cell gap, by forming the column spacer of a material having a high recovery ratio. A column spacer for controlling cell gap has the sum total of inelastic deformation and elastic deformation ranging from 1 to 3 micrometers. The column spacer has a recovery ratio of 50 percents or more. The column spacer is formed by photo-polymerizing a mixed solution of a liquid polymer precursor and a light initiator. The liquid polymer precursor includes a monoacrylate series of 10 to 20 percents, a triacrylate series of 10 to 20 percents, and a methacrylate series of 40 to 60 percents.

Description

Column Spacer for Controlling Cell gap and Liquid Crystal Display Device Using the Same}

1 is a cross-sectional view of a liquid crystal display including a column spacer.

2 is a graph showing the deformation amount for defining the recovery rate of the material

3 is a view showing the degree of deformation according to the pressure on the material

4 is a graph showing the deformation amount of the column spacer material generally used

5 is a cross-sectional view showing a liquid crystal display of the present invention.

6 is a plan view showing a liquid crystal display of the present invention.

7 is a graph showing a deformation amount for defining a recovery rate in the cell gap control column spacer and the general column spacer of the present invention;

* Description of symbols on the main parts of the drawings *

100: first substrate 101: gate line

101a: gate electrode 102: data line

102a: source electrode 102b: drain electrode

103: pixel electrode 104: semiconductor layer

105: gate insulating film 106: protective film

107: common line 107a: common electrode

108: contact hole 200: second substrate

201: black matrix layer 202: color filter layer

203: overcoat layer 210: column spacer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column spacer, and in particular, to a liquid crystal display device having a uniform cell gap by using a column spacer capable of controlling the cell gap of the liquid crystal layer by changing the physical properties of the material and the column spacer and increasing a manufacturing process margin It is about.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELD), and vacuum fluorescent (VFD) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD (liquid crystal display device) is the most widely used, replacing the CRT (Cathode Ray Tube) for mobile image display devices because of its excellent image quality, light weight, thinness, and low power consumption. In addition to mobile applications such as monitors, a variety of applications have been developed for television and computer monitors for receiving and displaying broadcast signals.

In order to use such a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness and large area can be realized while maintaining the characteristics of light weight, thinness and low power consumption. Can be.

The general liquid crystal display device is comprised from the 1st board | substrate and the 2nd board | substrate bonded by the fixed space, and the liquid crystal layer injected between the said 1st board | substrate and the 2nd board | substrate.

In more detail, the first substrate has a plurality of gate lines in one direction and a plurality of data lines at regular intervals in a direction perpendicular to the gate line to define a pixel area. A pixel electrode is formed in each of the pixel regions, and a thin film transistor is formed at a portion where the gate line and the data line cross each other, and the data signal of the data line is applied to each pixel electrode according to a signal applied to the gate line. To apply.

In addition, a black matrix layer is formed on the second substrate to block light in portions other than the pixel region, and R, G, and B color filter layers are formed on portions corresponding to the pixel regions. The common electrode is formed on the color filter layer to implement an image.

In the liquid crystal display as described above, the liquid crystal of the liquid crystal layer formed between the first and second substrates is aligned by an electric field between the pixel electrode and the common electrode, and the light passes through the liquid crystal layer according to the degree of alignment of the liquid crystal layer. You can express the image by adjusting the amount of.

Such a liquid crystal display device is called a twisted nematic (TN) mode liquid crystal display device, and the TN mode liquid crystal display device has a disadvantage in that the viewing angle is narrow, and thus an in-plane (IPS: In-Plane) is used to overcome the disadvantage of the TN mode. Switching mode liquid crystal display device has been developed.

In the transverse electric field type (IPS) mode liquid crystal display, a pixel electrode and a common electrode are formed parallel to each other at a predetermined distance in a pixel area of the first substrate so that a transverse electric field (horizontal electric field) is generated between the pixel electrode and the common electrode. The liquid crystal layer is aligned by the lateral electric field.

Meanwhile, spacers are formed between the first and second substrates of the liquid crystal display device formed as described above to maintain a constant gap between the liquid crystal layers.

Such spacers are divided into ball spacers or column spacers according to their shape.

The ball spacer has a spherical shape, is distributed and manufactured on the first and second substrates, the movement is relatively free even after the bonding of the first and second substrates, and the contact area with the first and second substrates is small.

On the other hand, the column spacer is formed in an array process on the first substrate or the second substrate, and is fixed in a pillar shape having a predetermined height on the predetermined substrate. Therefore, the contact area with the 1st, 2nd board | substrate is relatively large compared with a ball spacer.

Hereinafter, a liquid crystal display having a conventional column spacer will be described with reference to the accompanying drawings.

1 is a cross-sectional view illustrating a liquid crystal display including a column spacer.

As shown in FIG. 1, a liquid crystal display including a column spacer includes a column spacer formed between a first substrate 30 and a second substrate 40 facing each other, and the first and second substrates 30 and 40. 20) and a liquid crystal layer (not shown) filled between the first and second substrates 30 and 40.

On the first substrate 30, the gate lines 31 and the data lines (not shown) are arranged perpendicularly to each other to define pixel regions, and the gate lines 31 and the data lines cross each other. A thin film transistor TFT is formed, and a pixel electrode (not shown) is formed in each pixel area.

The black matrix layer 41 is formed on the second substrate 40 to correspond to an area except the pixel area, and the color filter layer 42 on the stripe corresponding to the pixel areas on the vertical line parallel to the data line is formed. The common electrode or overcoat layer 43 is formed on the front surface.

Here, the column spacer 20 is formed corresponding to a predetermined position on the gate line 31.

In addition, a gate insulating layer 36 is formed on the entire surface of the substrate including the gate line 31 on the first substrate 30, and a passivation layer 37 is formed on the gate insulating layer 36.

On the other hand, in the liquid crystal display device including the conventional column spacer described above, when the surface of the liquid crystal panel is touched by a predetermined direction using a hand or other object, spots are generated at the touched portion. Such spots are referred to as spot spots generated at the time of touch, and are referred to as touch spots, and are also referred to as touch defects because spots are observed on the screen.

This touch failure is considered to be large because the contact area between the column spacer 20 and the first substrate 30 facing the column spacer 20 is larger than that of the structure of the previous ball spacer. That is, since the column spacer formed in a cylindrical shape compared to the ball spacer has a relatively large contact area with the first substrate 30, the first and second substrates 30 and 40 are shifted from each other due to the touch. As a result, it takes a long time to restore to the original state, so the stain remains until the original state is restored.

In addition, a liquid crystal (not shown) is filled between the first and second substrates 30 and 40 facing each other, and the column spacer 20 is disposed at a predetermined portion between the first and second substrates 30 and 40. When the formed liquid crystal display device is in a standing state and is in a high temperature environment, when the liquid crystal is thermally expanded and the cell gap is increased to be greater than the height of the column spacer 20, the liquid crystal flows down to the lower side near the ground, and the lower end is bulged. The visible phenomenon is observed. This phenomenon is called gravity failure.

The conventional liquid crystal display including the column spacer has the following problems.

First, since the contact area between the column spacer and the opposing substrate is large, when the substrate is shifted during the touch due to the large frictional force, it takes a long time to recover to the original state, and touch failure is observed during the restoration time.

Second, when the liquid crystal panel including the column spacer is upright, when it is placed in a high temperature environment, thermal expansion of the liquid crystal occurs. The phenomenon of visual opacity is observed.

The present invention has been made in order to solve the above problems to maintain a uniform cell gap using the column spacer and the column spacer capable of controlling the cell gap of the liquid crystal layer by changing the physical properties of the material, and to increase the manufacturing process margin There is a purpose to provide a liquid crystal display device.

Cell gap control column spacer of the present invention for achieving the above object is a total deformation of plastic deformation and elastic deformation of 1 ~ 3㎛, the recovery rate is 50% or more during deformation.

The cell gap control column spacer is formed by a photopolymerization reaction between a liquid polymer precursor and a photoinitiator.

The liquid polymer precursor comprises 10 to 20% monoacrylate (monoacrylate), 10 to 20% triacrylate (triacrylate) and 40 to 60% methacrylate (methacrylate).

The monoacrylate series is hydroxypropyl acrylate.

The triacrylate series is pentaerythritol triacrylate.

The methacrylate series is ethylene glycol dimethacrylate.

The photoinitiator is a ketone initiator.

The ketone initiator is Iracure 184.

In addition, the liquid crystal display device of the present invention for achieving the same object includes a first substrate and a second substrate facing each other, a gate line and a data line formed to cross each other on the first substrate to define a pixel region, A column spacer formed on the second substrate corresponding to a predetermined portion on the gate line and having a total deformation of plastic deformation and elastic deformation of 1 to 3 μm, and having a recovery property of 50% or more upon deformation; It is characterized by including the liquid crystal layer filled between the first and second substrates.

The cell gap control column spacer is formed by a photopolymerization reaction between a liquid polymer precursor and a photoinitiator.

The liquid polymer precursor comprises 10 to 20% monoacrylate (monoacrylate), 10 to 20% triacrylate (triacrylate) and 40 to 60% methacrylate (methacrylate).

Hereinafter, the liquid crystal display device in which the cell gap is uniformly maintained using the cell gap control column spacer and the cell gap defect is solved is described. To this end, an experiment related to the recovery rate will be introduced, and an excellent material having a recovery rate characteristic according to the experiment will be described.

Hereinafter, a column spacer for controlling cell gap and a liquid crystal display using the same according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a graph showing the deformation amount for defining the recovery rate of the material, Figure 3 is a view showing the degree of deformation according to the pressure on the material.

The recovery rate is expressed as the ratio of the distance changed when released with the same force for the same time and the distance changed when pressed with a constant force for a certain time, and is generally measured in the same manner as in FIG. 2.

In FIG. 2, the speed v in the processes 1 and 3 is 3 (0.45 gf / sec), and the maximum load is 5 gf (gravity force). ① Process is a section to load from 0 to 5gf, ② Process is a section to maintain a certain time (usually 5sec) at 5gf, ③ Process is a section to reduce the load from 5gf to 0, ④ Process is a load 0 to 5sec It is a section to keep liver.

x100)은 탄성 변형(elastic deformation)을 총 변형(total deformation)으로 나눈 값으로 정의한다.Here, the difference in deformation thickness from the maximum point of the process to the minimum point of the process is called elastic deformation, and the difference in deformation thickness from zero to the minimum point of the elastic deformation is called plastic deformation. called plastic deformation, and the elastic deformation ratio (%) =

x100) is defined as the elastic deformation divided by the total deformation.

As shown in FIG. 3, for example, when the column spacer 20 is formed at a predetermined height h, the total deformation of the column spacer 20a when the column spacer 20 is deformed to the maximum when the predetermined force is applied in the vertical direction. Is the sum of the elastic deformation (h1) and the plastic deformation (h2). In this case, the column spacer 20b recovers to some extent after a predetermined time after decompression, wherein the recovered thickness h1 is elastic deformation. And plastic deformation means the thickness which does not recover but remains in the pressed state.

On the other hand, the elastic body existing in most natural systems, after applying a predetermined pressure or more, does not completely recover to its original state when the pressure is removed, and the denatured portion to some extent returns to the remaining state.

Hereinafter, a recovery rate of a material of a column spacer generally used as a material and a cell gap for each region when the same is applied to a liquid crystal display will be described.

4 is a graph showing a deformation amount of a column spacer material generally used.

As shown in FIG. 4, when column spacers are formed of materials commonly used (CS1, CS2), and a recovery rate experiment is performed using the same, data of the total amount of deformation due to pressing is less than 0.7 µm at a level of 0.5 to 0.6 µm. Able to know. As such, when the total deformation amount is less than 0.7 μm, the degree of freedom of deformation due to external pressure is small, and the plasticity defect is severe. Therefore, the restoring force of the column spacer formed by using such a material is poor. As a result, the thickness control margin of the column spacer using the material is small, resulting in an increase in process load such as coating thickness, curing, and development for forming the column spacer.

Table 1 is a table showing the modification data of the general commercial column spacer material of FIG.

Sample data  Deformation amount [㎛] % Recovery Force Total deformation Plastic deformation Elastic deformation CS1 5gf 0.623 0.222 0.401 64.4 CS2 5gf 0.541 0.175 0.366 67.6

As can be seen from the experimental values, the total strains of the common commercial first and second column spacer materials are 0.623 and 0.541, respectively, and the range is about 0.5 to 0.7 μm, and the elastic strains are 0.401 μm, respectively. At 0.366 mu m, the recovery rates of the first and second column spacers were 64.4% and 67.6%, respectively. Such commercial column spacer materials have a recovery rate of 50% or more at a small total amount of deformation, but since the actual deformation value is within 0.5 to 0.7 µm, the deformation degree of freedom is not good and is destroyed or completely destroyed when a strong force is pressed. There is a risk of plastic deformation.

5 is a cross-sectional view illustrating a liquid crystal display of the present invention, and FIG. 6 is a plan view of the liquid crystal display of the present invention.

5 and 6, the liquid crystal display of the present invention includes a first substrate 100 and a second substrate 200 facing each other, a liquid crystal layer 170 and the first substrate (filled therebetween). It comprises a column spacer 210 formed at a position corresponding to the gate line 101 of the (100).

In more detail, the gate line 101 formed in one direction on the first substrate 100 including the gate electrode 101a and the gate formed on the entire surface of the first substrate 100 including the gate line 101. A second insulating layer 105, a semiconductor layer 104 formed in an island shape covering the gate electrode 101a on the gate insulating layer 105, and a source electrode 102a protruding to be perpendicular to the gate line 101. The data line 102 formed on the gate insulating layer 105 in the direction, the passivation layer 106 formed on the entire surface of the first substrate 100 including the data line 102, and the pixel region above the passivation layer 106. The pixel electrode 103 and the common electrode 107a are formed alternately with each other. Here, the common electrode 107a extends from the common line 107 adjacent to the gate line 101 and parallel to the gate line 101.

The thin film transistor TFT may include a gate electrode 101a protruding from the gate line 101, a source electrode 102a protruding in a 'U' shape from a predetermined portion of the data line 102, and A part of the drain electrode 102b spaced apart from the source electrode 102a into the 'U'-shaped pattern of the source electrode 102a and the source / drain electrode 102a / on the gate electrode 101a. And a semiconductor layer 104 formed partially in contact with the lower portion of 102b. Here, the semiconductor layer 104 is formed of a laminate in which an amorphous silicon layer is formed at a lower portion and an impurity layer is formed at an upper portion thereof, and an impurity layer is removed at a portion corresponding to a region between the source electrode 102a and the drain electrode 102b. It is formed. Here, the shape of the source electrode 102a of the thin film transistor may be formed in a '-' shape, and the shape of the illustrated source electrode is for forming a large channel formation area.

The black matrix layer 201 is formed on the second substrate 200 to cover a region (gate line and data line corresponding portions) except the pixel region and a thin film transistor forming portion, and the black matrix layer 201 The color filter layer 202 is formed on the second substrate 200 including at least a pixel area, and overcoats the entire surface of the second substrate 200 including the black matrix layer 201 and the color filter layer 202. Layer 203 is formed. In addition, a column spacer 210 is formed on the overcoat layer 203 to correspond to an upper portion of the protrusion 110 on the gate line 101.

In addition, the seal pattern 150 is formed to correspond to the outer regions of the first and second substrates 100 and 200 to bond the two substrates together.

On the other hand, reference numeral 108, which has not been described, is a contact hole exposing a predetermined portion of the drain electrode 102b to the protective film 106, and the drain electrode 102b and the pixel electrode 103 are electrically connected in the contact hole.

FIG. 4 is a diagram schematically illustrating a layer influencing the cell gap, and it can be seen that the thickness of the gate line 101 and the thickness of the column spacer 210 directly affect the cell gap.

thickness Gate line Column spacer Cell gap First area 0.25 μm 3.3㎛ 3.3㎛ Second area 0.25 μm 3.4㎛ 3.4㎛ Third area 0.25 μm 3.5 ㎛ 3.5 ㎛ Fourth area 0.25 μm 3.6 μm 3.6 μm Fifth area 0.25 μm 3.7 ㎛ 3.7 ㎛

Table 2 shows the cell gap measurement data according to the height of the column spacer for each region when the column spacer is formed of a commonly used column spacer material (used in the experiment in FIG. 4).

The commonly used column spacer material is made of a negative photosensitive resin and is patterned so that only the exposed part is left through an exposure and development process, and a step by region may occur in such a patterning process. As shown in Table 2, when the step difference occurs for each region, the cell gap of the height of the column spacer in each region is measured. Each of the column spacers was formed to gradually increase at intervals of 0.1 μm from the first to the fifth regions, and cell gaps according to the heights of the column spacers were observed in each region, indicating that cell gap deviations occurred for each region. Able to know.

This means that column spacer height control is very important, and that even if the coating thickness uniformity for the column spacer material is slightly degraded, staining due to cell gap failure is frequent.

7 is a graph showing the amount of deformation for defining the recovery rate in the cell gap control column spacer and the general column spacer of the present invention.

In view of the fact that plastic deformation is severe at a large total strain value (1 µm or more) of a general commercially available column spacer material, and in some cases, recovery to the original state is impossible, the column spacer for cell gap control of the present invention is The material constituting the column spacer is changed so that the material has a good recovery rate at a large total strain value. That is, the cell gap control column spacer of the present invention is formed using a material having a total deformation value of 1 to 3 μm, which is a sum of elastic deformation and plastic deformation, and having a recovery rate of 50% or more.

Sample data Power [gf] Deformation amount [㎛] % Recovery Total strain Plastic deformation Elastic deformation CS3 5 2.339 0.885 1.454 62.2 CS4 5 2.160 0.997 1.184 54.8 CS5 5 1.407 0.713 0.694 49.3 CS6 5 1.192 0.629 0.564 47.3 CS7 5 1.346 0.732 0.615 45.7

In the experiments of Tables 3 and 7, the pressurization is increased compared to FIGS. 4 and 1 to increase the total deformation value of the column spacer material. In this experiment, the total strain data of the column spacer materials (CS3, CS4, CS5, CS6, CS7) used were 2.339 μm, 2.160 μm, 1.407 μm, 1.192 μm, and 1.346 μm, respectively. It can be seen that. In addition, the elastic deformation amount, which is a value restored from each total deformation amount of each column spacer material, is 1.454, 1.184, 0.694, 0.564, 0.615, and the respective recovery rates are 62.2%, 54.8%, 49.3%, 47.3%, and 45.7%. Through these experiments, the third and fourth column spacer materials CS3 and CS4 and the fifth to seventh column spacer materials CS5, CS6, and CS7 of the column spacer materials used in the experiments of Table 4 and FIG. 7 are obtained. It can be seen that the degree of tendency is different depending on whether the recovery rate is over 50%.

That is, the fifth to seventh column spacer materials represent common commercial column spacer materials, and the third and fourth column spacer materials represent the cell spacer control column spacer materials of the present invention.

As described above, the cell gap control column spacer of the present invention is made of the following material. That is, in the form of a mixed liquid of a liquid prepolymer and an initiator, the material has a low viscosity of 10 cps or less. Looking at the ingredients in more detail, it contains 10 to 20% of monoacrylate, 10 to 20% of triacrylate, and 40 to 60% of methacrylate. And contains less than 3% photoinitiator. Examples of each component in the experiment is hydroxypropyl acrylate as the monoacrylate series, pentaerithritol triacrylate as the triacrylate series, methacrylate as the Is an ethylene glycol dimethacrylate (ethyleneglycol dimethacrylate), as a photo initiator, for example, Iracure 184 (Iracure 184) was used as the ketone-based initiator.

The third and fourth column spacer materials disclosed in Table 4 are represented by controlling the amount of components of the above-described liquid polymer precursor and the photoinitiator within the above-described range.

The column spacer for controlling cell gap of the present invention is not a patterning process using general exposure and development, but an IPP (In Plane Printing) method to apply a liquid mixture of a liquid polymer precursor and an initiator onto a substrate, and to engrav the patterning part. The defined soft molds are matched to fill the mixture with the mixed solution, and heat or light to react with the initiator is applied to pattern the shape of the intaglio to form column spacers.

Table 4 shows the cell gap change according to the thickness of the column spacer of the liquid crystal panel for each region when the column spacer is formed in the liquid crystal panel using the third and fourth column spacer materials used in the above-described experiment. Table 4 shows that the column spacer process margin is very high because there is little effect on the cell gap despite the change in the fine height of the column spacer.

Thickness [㎛] Gate line Column spacer Cell gap First area 0.25 μm 3.3㎛ 3.3㎛ Second area 0.25 μm 3.4㎛ 3.3㎛ Third area 0.25 μm 3.5 ㎛ 3.3㎛ Fourth area 0.25 μm 3.6 μm 3.3㎛ Fifth area 0.25 μm 3.7 ㎛ 3.35 μm

That is, as shown in Table 4, it can be seen that the cell gap control column spacer of the present invention (composed of the third and fourth column spacer materials) maintains a substantially uniform value even when the column spacers formed for each region are formed with deviations. Can be. This means that when the desired cell gap is 3.3 占 퐉, the column spacer formation portion formed higher than that holds the elastic force as much as the formed height, and the thickness obtained by the elasticity means that the gravity margin under the condition of gravity failure is a gravity margin. The column spacer does not fall below the level of gravity margin with respect to the opposing substrate when the liquid crystal expands. Therefore, the liquid crystal flows downward due to the expansion of the liquid crystal, thereby lowering the possibility of generating gravity, which is advantageous in a fair manner. In particular, the cell gap control column spacer of the present invention maintains a large value of the elastic deformation value compared to the material of the column spacer used in general, the process margin of gravity failure which is a problem in large panels can be increased.

In addition, the cell gap unevenness due to the thickness ununiformity of the column spacer can also be alleviated.

In addition, it is possible to prevent the first and second substrates from being shifted with each other when the column spacer is touched by the thickness of the elasticity, thereby improving the touch failure. On the other hand, in the above-described structure of the liquid crystal display device of the present invention in order to increase the effect of improving the touch failure, it may be considered to form a projection on the portion corresponding to the column spacer.

The material of the column spacer which satisfies the characteristics of good recovery rate under such a large amount of deformation has a form of a liquid mixture of a liquid polymer precursor and an initiator. Such column spacers are not formed by a general patterning process of spin coating, then exposing and selectively patterning them, but by non-exposure, intaglio is formed in the soft mold, and the liquid crystal polymer precursor is formed on the substrate to which the soft mold is opposed. After the application of the mixed solution of the initiator and the source mold to the soft mold to the counter substrate, the mixed solution is sucked into the intaglio by capillary action, and the soft mold is exposed to UV (Ultra Violet) exposure from the back side. In this case, column spacers are formed in the intaglio shape.

The cell gap control column spacer of the present invention and the liquid crystal display using the same have the following effects.

First, in a condition where the total amount of deformation is large, by forming a column spacer with a material having a high recovery rate, even if a height deviation between column spacers formed for each region occurs, a portion formed larger than the cell gap after bonding is formed by its own elasticity. By pressing, the cell gap difference of each region does not occur as a whole and is pressed with an even cell gap.

Therefore, the portion pressed more than the cell gap acts as a gravity margin under the condition of gravity failure in which the liquid crystal expands, so that the column spacer is in contact with the opposite substrate by the gravity margin, thereby preventing the liquid crystal from flowing down and preventing gravity failure. .

Second, after the bonding, the resilience of the column spacer in its own condition under the external pressure is applied, and the recovery force of returning to the original state after deformation of the column spacer is good, so that the poor pressing (poor slipping) and the like can be prevented.

Ultimately, after the cell gap control column spacer and the column spacer using the same, the column spacer corresponds to the even cell gap by elasticity of the column spacer, thereby preventing various defects due to the cell gap defect. Therefore, productivity can be improved by increasing the column spacer thickness margin.

Claims (11)

The total strain of plastic deformation and elastic deformation is 1 to 3 µm, and the cell spacer is a column spacer for cell gap control, characterized in that the recovery rate is 50% or more. The method of claim 1, The cell gap control column spacer is a cell gap control column spacer, characterized in that the mixture of the liquid polymer precursor and the photoinitiator made by the photopolymerization reaction. The method of claim 2, The liquid polymer precursor is a cell comprising a monoacrylate-based (10-20%), triacrylate (triacrylate) 10-20% and methacrylate (methacrylate) -based cell consisting of Column spacer for gap control. The method of claim 3, wherein The monoacrylate-based column spacer for cell gap control, characterized in that hydroxypropyl acrylate (hydroxypropyl acrylate). The method of claim 3, wherein The triacrylate-based column spacer for cell gap control, characterized in that the pentaerythritol triacrylate (pentaerythritol triacrylate). The method of claim 3, wherein The methacrylate series is a cell spacer control column spacer, characterized in that ethylene glycol dimethacrylate (ethyleneglycol dimethacrylate). The method of claim 2, The photoinitiator is a cell spacer control column spacer, characterized in that the ketone (Ketone) -based initiator. The method of claim 7, wherein The ketone-based initiator is Irakure 184, characterized in that the cell gap control column spacer. A first substrate and a second substrate facing each other; A gate line and a data line intersecting each other on the first substrate to define a pixel area; A column spacer formed on the second substrate corresponding to a predetermined portion on the gate line and having a total deformation of plastic deformation and elastic deformation of 1 to 3 μm and a recovery rate of 50% or more upon deformation; And And a liquid crystal layer filled between the first and second substrates. The method of claim 9, The cell gap control column spacer is a cell gap control column spacer, characterized in that the mixture of the liquid polymer precursor and the photoinitiator made by the photopolymerization reaction. The method of claim 10, The liquid polymer precursor is a cell comprising a monoacrylate-based (10-20%), triacrylate (triacrylate) 10-20% and methacrylate (methacrylate) -based cell consisting of Column spacer for gap control.

Images