KR101069250B1 - Liquid crystal display panel and method for fabricating thereof - Google Patents

Abstract

In the liquid crystal display panel and a method of manufacturing the same, a column spacer for maintaining a uniform cell gap between the first substrate and the second substrate is fixed to either one of the first substrate and the second substrate, and the other By fixing by using protrusions formed on the surface of the substrate, the flow of the first substrate and the second substrate can be suppressed, thereby preventing the substrate from being pushed or distorted due to external impact, thereby preventing liquid crystal display panels due to touch stains or poor pressing. In order to prevent poor image quality of the first substrate; A second substrate bonded to the first substrate; A thin film transistor formed on the first substrate; A plurality of dummy patterns formed on the first substrate and made of the same material on the same layer as the source / drain electrodes of the thin film transistor; A passivation layer formed on the first substrate including the plurality of dummy patterns and having a plurality of protrusions formed on the plurality of dummy patterns; A plurality of column spacers disposed between the first substrate and the second substrate and positioned in the plurality of protrusions; And a liquid crystal layer formed in a cell gap between the first substrate and the second substrate.

LCD panel, column spacer, projection

Description

Liquid crystal display panel and its manufacturing method {LIQUID CRYSTAL DISPLAY PANEL AND METHOD FOR FABRICATING THEREOF}

1 is a plan view schematically illustrating a structure of a general liquid crystal display panel.

2 is an exemplary view illustrating a cross section of a liquid crystal display panel in which column spacers are formed.

3 is an exemplary view showing a cross section of a liquid crystal display panel according to a first embodiment of the present invention.

4 is an exemplary view showing a part of an array substrate of a liquid crystal display panel according to the present invention.

FIG. 5 is an exemplary view showing a cross section taken along line IV-IV 'of the array substrate shown in FIG. 4; FIG.

6 is an exemplary view showing a cross section of a liquid crystal display panel according to a second embodiment of the present invention.

7 is an exemplary view showing a cross section of a liquid crystal display panel according to a third embodiment of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

200, 300, 400: liquid crystal display panel 201, 301, 401: first substrate

202,302,402: second substrate 210,310,410: column spacer                 

220,320,420: projection

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method of manufacturing the same, and more particularly, to suppress the flow of the bonded first substrate and the second substrate constituting the liquid crystal display panel, and to prevent the first substrate and the second substrate by external impact. The present invention relates to a liquid crystal display panel and a method for manufacturing the same, which are suitable for preventing the phenomenon of the pushing and the distortion of the first and second substrates.

In general, a liquid crystal display device is a display device that displays a desired image by separately supplying data signals according to image information to pixels arranged in a matrix form, and adjusting light transmittance of the pixels.

Accordingly, the liquid crystal display includes a liquid crystal display panel in which pixels are arranged in a matrix and a driving unit for driving the pixels.

The liquid crystal display panel is bonded to a first substrate on which a thin film transistor array is formed and a second substrate on which a color filter array is formed so that a uniform cell gap is maintained. The liquid crystal layer is formed in the cell gap between the substrate and the second substrate.

In this case, the first substrate and the second substrate are bonded by a seal pattern formed along the outer edge of the image display unit, and the polarized plate and the phase difference plate are provided on the outer surfaces of the bonded first substrate and the second substrate. By selectively configuring a plurality of components, a liquid crystal display device having high luminance and contrast characteristics by changing a light propagation state or a refractive index is configured.

A common electrode and a pixel electrode are formed in the liquid crystal display panel where the first substrate and the second substrate are opposed to each other to apply an electric field to the liquid crystal layer. That is, by controlling the voltage applied to the pixel electrode while the voltage is applied to the common electrode, the light transmittance of the pixels can be adjusted individually. As described above, in order to control the voltage applied to the pixel electrode for each pixel, a thin film transistor used as a switching element is formed in each pixel.

In addition, an alignment layer is formed on an opposing surface of the first substrate and the second substrate, and rubbing is performed to arrange the liquid crystals of the liquid crystal layer in a constant direction.

The components of the liquid crystal display panel as described above will be described in detail with reference to the accompanying drawings.

1 is a plan view schematically illustrating a structure of a general liquid crystal display panel in which a first substrate on which the thin film transistor array is formed and a second substrate on which a color filter array is formed are bonded.

As shown in the figure, the liquid crystal display panel 100 includes an image display unit 113 in which pixels are arranged in a matrix form, a gate pad unit 114 and data lines connected to gate lines of the image display unit 113. And a data pad unit 115 connected to the data pad unit. In this case, the gate pad part 114 and the data pad part 115 are formed in an edge region of the first substrate 101 that does not overlap the second substrate 102, and the gate pad part 114 is a gate driver. The scan signal supplied from (not shown) is supplied to the gate lines of the image display unit 113, and the data pad unit 115 supplies image information supplied from the data driver (not shown) to the data line of the image display unit 113. Feed the fields.

In addition, the first substrate 101 is arranged such that data lines to which image information is applied and gate lines to which a scanning signal is applied cross each other, and are respectively thin film transistors in regions divided by the data lines and the gate lines. (Not shown) and a pixel electrode (not shown) are provided.

Although not shown in the drawing, the second substrate 102 includes a color filter coated for each pixel by a black matrix and a common electrode that is a counter electrode of the pixel electrode formed on the first substrate 101.

The first substrate 101 and the second substrate 102 have a constant cell gap maintained by spacers (not shown), and are formed by a seal pattern 116 formed along the periphery of the image display unit 113. Are coalesced.

In this case, a method of randomly dispersing ball spacers, such as glass beads or plastic beads, has been used. However, as the liquid crystal display panel is gradually enlarged in recent years, precise cell gap is maintained due to agglomeration of ball spacers. Is difficult, and poor image quality occurs.

Therefore, in the case of a large liquid crystal display panel, a column spacer (or a patterned spacer) fixed to an array substrate as a first substrate or a color filter substrate as a second substrate is used without using a ball spacer.                         

2 is an exemplary view illustrating a cross section of a liquid crystal display panel in which the column spacer is formed.

As shown in the drawing, the liquid crystal display panel 100 is formed by combining a first substrate 101 on which a thin film transistor array is formed and a second substrate 102 on which a color filter array is formed, and the second substrate 102. Column spacers 110 are formed thereon to maintain a constant cell gap between the first substrate 101 and the second substrate 102.

The column spacers 110 are fixed on the second substrate 102 to contact the surface of the first substrate 101 when the first substrate 101 and the second substrate 102 are bonded to each other.

However, as described above, when the column spacers 110 are fixed on the second substrate 102 to contact the surface of the first substrate 101, the following problems occur.

That is, when an external force is applied, the second substrate 102 flows in one direction to cause touch unevenness or deterioration, and frictional force due to surface contact between the column spacers 110 and the first substrate 101. Due to this size, the time required for the second substrate 102 to return to its original position becomes long, which causes continuous touch unevenness or deterioration in the image of the liquid crystal display panel 100 to decrease display quality. It becomes a factor.

In addition, when the column spacers 110 flow from side to side due to an external force, cell gap nonuniformity occurs due to the external force, thereby causing deterioration in image quality such as luminance nonuniformity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention suppresses the flow of the bonded first substrate and the second substrate constituting the liquid crystal display panel, and the phenomenon in which the first substrate or the second substrate is pushed by an external impact and the first It is an object of the present invention to provide a liquid crystal display panel and a method of manufacturing the same, which can prevent the substrate and the second substrate from being warped.

Other objects and features of the present invention will be described in the configuration and claims of the invention described below.

In order to achieve the above object, the liquid crystal display panel of the present invention comprises a first substrate; A second substrate bonded to the first substrate; A thin film transistor formed on the first substrate; A plurality of dummy patterns formed on the first substrate and made of the same material on the same layer as the source / drain electrodes of the thin film transistor; A passivation layer formed on the first substrate including the plurality of dummy patterns and having a plurality of protrusions formed on the plurality of dummy patterns; A plurality of column spacers disposed between the first substrate and the second substrate and positioned in the plurality of protrusions; And a liquid crystal layer formed in a cell gap between the first substrate and the second substrate.

In addition, the liquid crystal display panel of the present invention is a plurality of gate lines that are uniformly spaced apart on the first substrate and arranged in a horizontal direction, a plurality of data lines that are regularly spaced apart and arranged in a vertical direction, the plurality of data lines crossing the gate line, the gate A passivation layer formed on a pixel formed in an area where lines and data lines intersect, a dummy pattern formed on the gate line, a first substrate including the dummy pattern, and having a step like a protrusion on the dummy pattern. And a second substrate to be bonded with the second substrate.

Method of manufacturing a liquid crystal display panel of the present invention comprises the steps of forming a protective film on the surface of the first substrate; Forming a photoresist film on the protective film; Exposing and developing the photosensitive film through diffraction exposure or half-tone exposure to form a photoresist pattern for selectively exposing the protective film; Etching a passivation layer selectively exposed by the photoresist layer pattern to form a plurality of protrusions on the passivation layer surface; Forming a plurality of column spacers on the second substrate; And bonding the first substrate and the second substrate so that the column spacer is positioned and fixed in the plurality of protrusions formed on the first substrate.
In addition, another method of manufacturing a liquid crystal display panel of the present invention comprises the steps of: patterning a gate line on the first substrate; Forming a gate insulating layer on the first substrate on which the gate line is patterned; Forming a plurality of dummy patterns of the same material as the source / drain electrodes on the gate insulating film of the region where the gate line is formed while forming a source / drain electrode on the gate insulating film; Forming a passivation layer on the first substrate including the source / drain electrodes and a plurality of dummy patterns; Forming a plurality of column spacers on the second substrate; And bonding the first substrate and the second substrate to each other, wherein the passivation layer has a plurality of protrusions formed on the plurality of dummy patterns.

Hereinafter, exemplary embodiments of a liquid crystal display panel and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary view showing a cross section of a liquid crystal display panel according to a first embodiment of the present invention.

As shown in the figure, the liquid crystal display panel 200 according to the first exemplary embodiment of the present invention is formed by bonding the first substrate 201 and the color filter array on which the thin film transistor array is formed to be bonded to the first substrate 201. And a column spacer 210 formed on the second substrate 202 and the second substrate 202 to uniformly maintain a cell gap between the first substrate 201 and the second substrate 202.

In this case, a liquid crystal layer (not shown) is formed in the cell gap between the first substrate 201 and the second substrate 202, and the column spacer is formed on the surface of the first substrate 201 in contact with the column spacer 210. Protrusions 220 are formed to prevent the flow of 210.

As described above, the liquid crystal display panel 200 according to the first exemplary embodiment of the present invention forms the column spacer 210 on the second substrate 202, and the flow preventing protrusions 220 are formed on the surface of the first substrate 201. By forming and bonding the first substrate 201 and the second substrate 202 to prevent the flow of the column spacer 210 due to an external force, it is possible to prevent the deterioration of the image quality of the liquid crystal display panel.

4 is an exemplary view showing a part of an array substrate of a liquid crystal display panel according to the present invention.

As shown in the drawing, the liquid crystal display panel according to the present invention is regularly spaced apart from the plurality of gate lines GL arranged in the horizontal direction, and is regularly spaced apart from the plurality of gate lines GL. And a plurality of data lines DL that intersect with each other, and a pixel PXL that is an image display area defined by crossing the gate lines GL and the data lines DL.

In this case, column spacers 210 may be disposed on the gate lines GL to maintain a cell gap of the liquid crystal display panel, and upper, lower, left, and right sides of the column spacers 210 may prevent the flow of the column spacers 210. The protrusions 220 are formed. In this case, the column spacers 210 and the protrusions 220 may be formed to have a separation margin of about 0 to 6 μm. In addition, the column spacer 210 may be formed to have a cross-sectional area that is at least smaller than the area formed by the protrusions 220.

The pixel PXL includes a switching element such as a thin film transistor for selectively supplying an image signal applied through the data line DL to the pixel PXL by a scan signal applied through the gate line GL. A pixel electrode (not shown) for driving a liquid crystal layer by an image signal applied through the thin film transistor is provided.                     

Although not shown in the drawing, the thin film transistor includes a gate electrode extending at a predetermined position of the gate line and a source electrode extending at a predetermined position of the data line so that the gate electrode and a predetermined region overlap each other. A drain electrode corresponding to the electrode and the gate electrode and overlapping the gate electrode with a predetermined region is provided.

In addition, the source electrode and the drain electrode are uniformly spaced apart on the gate electrode, and the drain electrode is in electrical contact with the pixel electrode through a drain contact hole (not shown). In this case, the pixel electrode may be formed of a conductive material having high light transmittance, and may be, for example, indium tin oxide (ITO) or indium zinc oxide (IZO).

The thin film transistor includes a semiconductor layer (not shown), and when a scan signal is supplied to the gate electrode through the gate line GL, a conductive channel is formed between the source electrode and the drain electrode.

FIG. 5 is an exemplary view illustrating a cross section taken along line IV-IV ′ of the array substrate illustrated in FIG. 4, and illustrates an example in which the column spacer is integrally formed with a color filter substrate which is a second substrate.

As shown in the figure, the liquid crystal display panel 200 according to the present exemplary embodiment includes a first substrate 201 having a thin film transistor array and a second filter substrate having a color filter array formed thereon and bonded to the first substrate 201. A column spacer 210 formed on the second substrate 202 and the second substrate 202 to uniformly maintain a cell gap between the first substrate 201 and the second substrate 202, and the first substrate 201 and the second substrate 202; It is composed of a liquid crystal layer (not shown) formed in the cell gap of the substrate 202.

In this case, the first substrate 201 may include a gate insulating layer 232 and a protective layer 233 formed on the entire surface of the gate line GL formed on the substrate 231 and the substrate 231 on which the gate line GL is formed. The protrusion 220 is formed around the column spacer 210 in contact with the passivation layer 233 to prevent the flow of the column spacer 210.

The protrusions 220 may be formed on the passivation layer 233 of the first substrate 210 with the same material as the column spacer 210 formed on the second substrate 202, and the passivation layer 233 may be avoided to avoid further processing. It may be formed by patterning using.

In addition, the second substrate 202 is a red, green and blue color filter partitioned by the black matrix 242 and the black matrix 242 formed on the substrate 241 and arranged in a matrix so as to correspond to the pixel region. 243 and an overcoat layer 244 planarizing the surface of the substrate 241 on which the red, green, and blue color filters 243 are formed.

The column spacer 210 is formed on the overcoat layer 244. When the stack structure of the black matrix 242 and the color filters 243 of red, green, and blue is formed flat, the overcoat layer 244 is formed. The column spacer 210 is formed on the black matrix 242 or on the red, green, and blue color filters 243 without forming a).

The manufacturing method of the liquid crystal display panel according to the present embodiment configured as described above is provided with a step of forming a first substrate 201, a step of forming a second substrate 202 and a surface of the first substrate 201. Forming the protrusion 220 and forming the column spacer 210 on the second substrate 202 and the second substrate 202 between the protrusions 220 formed on the first substrate 201. The first substrate 201 and the second substrate 202 are bonded to each other so that the column spacers 210 formed thereon are coupled to each other, which will be described below.

First, the forming of the first substrate 201 may include patterning a gate line GL on the substrate 231 and a gate insulating layer 232 on the upper surface of the substrate 231 on which the gate line GL is patterned. ) And forming a protective film 233 on the entire upper surface of the gate insulating film 232 and forming a protrusion 220 on the protective film 233.

Meanwhile, when the diffraction exposure method or the half-tone method is applied to the process of forming the protective film 233, the protrusion 220 is formed on the surface of the protective film 233 through a single photolithography process without an additional process. ) Can be formed.

In the diffraction exposure method or the half-tone method, a photoresist layer is formed on the surface of the protective film 233, and a photoresist layer is exposed and developed through a mask to form a pattern of the photoresist film. In the photolithography process of etching), it is a method that can be exposed by varying the intensity of light incident on the photosensitive film.

As described above, when exposure is performed by varying the intensity of light incident on the photoresist layer, the thickness of the photoresist pattern remaining after development may be differentiated, and the protective layer 233 may have different depths by using the thickness difference of the photoresist pattern. By etching, the protrusion 220 may be formed on the surface of the passivation layer 233 through one photolithography process.

The forming of the second substrate 202 may include forming a black matrix 242 on the substrate 241 and red, green, and blue color filters on the substrate 241 on which the black matrix 242 is formed. And forming an overcoat layer 244 on the top surface of the substrate 241 on which the black matrix 242 and the red, green, and blue color filters 243 are formed.

As described above, in the liquid crystal display panel of the first embodiment, in forming protrusions on the first substrate to prevent the flow of column spacers, the protrusions are formed on the passivation layer by an additional process or by using diffraction exposure. For example, the present invention is not limited thereto, and a protrusion may be formed without additional processes by forming a dummy pattern in the process of forming a thin film transistor, which will be described in detail with reference to the following second embodiment.

6 is an exemplary view showing a cross section of a liquid crystal display panel according to a second embodiment of the present invention.

In this case, the liquid crystal display panel of the present exemplary embodiment has the same configuration as the liquid crystal display panel of the first exemplary embodiment except for the configuration of the first substrate on which the protrusions are formed. The same configuration as that of the liquid crystal display panel of the first embodiment will be omitted, and only the configuration of the first substrate will be described.                     

As shown in the figure, in the liquid crystal display panel 300 according to the second exemplary embodiment of the present invention, a column spacer 310 is formed on a second substrate 302, and a second column spacer 310 is formed. The protrusions 320 are formed on a surface of the first substrate 301, which is an opposite substrate of the substrate 302, to prevent the flow of the column spacer 310.

In this case, the protrusion 320 forms a dummy pattern 350 on the gate insulating layer 332 during the process of forming the thin film transistor on the pixel of the first substrate 301, thereby preventing the protection layer 333 formed on the protrusion 320. It can be formed to have. That is, in the process of forming the source / drain electrodes (not shown) of the thin film transistor on the substrate 331, the dummy pattern 350 is formed on the gate insulating layer 332 with the same material as the metal material constituting the source / drain electrodes. As the dummy pattern 350 is formed, the passivation layer 333 formed on the dummy pattern 350 has the same step as the protrusion 320 around the column spacer 310, as illustrated in the column spacer 310. The flow can be prevented.

In the first and second embodiments, the column spacer is formed to be fixed to the color filter substrate which is the second substrate, and the flow preventing protrusion is formed on the first substrate facing the second substrate to which the column spacer contacts. Although the present invention has been described with reference to an example, the present invention is not limited thereto, and the first and second substrates may be formed by forming column spacers on an array substrate, which is a first substrate, and forming protrusions on a second substrate, which is an opposite substrate. 2, it may be possible to prevent a touch unevenness or a bad press due to the flow of the substrate, which will be described in detail through the following third embodiment.

7 is an exemplary view illustrating a cross section of a liquid crystal display panel according to a third exemplary embodiment of the present invention.

As shown in the drawing, the liquid crystal display panel 400 according to the third exemplary embodiment of the present invention is formed with a first substrate 401 on which a thin film transistor array is formed and a color filter array, and is bonded to the first substrate 401. A column spacer 410 and the column spacer 410 formed on the second substrate 402 and the first substrate 401 to uniformly maintain a cell gap between the first substrate 401 and the second substrate 402. A projection 420 formed on a surface of the second substrate 402 in contact with the substrate to prevent flow of the column spacer 410, and a liquid crystal layer formed in a cell gap between the first substrate 401 and the second substrate 402. (Not shown).

In the liquid crystal display panel 400 according to the third exemplary embodiment, the column spacer 410 is formed on the first substrate 401, and the protrusion 420 is formed on the surface of the second substrate 402.

In this case, the second substrate 402 is partitioned by the black matrix 442 and the black matrix 442 formed on the substrate 441 and arranged in a matrix so as to correspond to the pixel region. 443 and an overcoat layer 444 to planarize the surface of the substrate 441 on which the red, green, and blue color filters 443 are formed.

A protrusion 420 is formed around the column spacer 410 to prevent the flow of the column spacer 410 formed on the first substrate 401 on the overcoat layer 444, and the black matrix 442 is formed. When the stacked structure of the red, green, and blue color filters 443 is flat, the black matrix 442 or the red, green, and blue color filters 443 are not formed without forming the overcoat layer 444. The protrusion 410 may be formed in the.

In addition, the protrusion 420 may be formed using the same material as the column spacer 410, or may be formed by patterning the overcoat layer 444.

In the liquid crystal display panels according to the first to fourth embodiments of the present invention, a column spacer for maintaining a uniform cell gap between the first substrate and the second substrate is fixed to either one of the first substrate and the second substrate. In contact with one substrate, by forming protrusions on the surface of the first substrate or the second substrate, it is possible to prevent the flow of the column spacer by fixing the column spacer in the protrusions.

As described above, when the column spacer is fixed and coupled by protrusions formed on the other substrate while being fixed with one substrate, the flow of the first substrate and the second substrate can be suppressed, and As a result, the phenomenon in which the first substrate and the second substrate are pushed and the distortion of the first substrate and the second substrate can be prevented.

Therefore, it is possible to prevent poor image quality of the liquid crystal display panel such as light leakage due to touch unevenness or poor pressing.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

As described above, the liquid crystal display panel and the method of manufacturing the same according to the present invention have a column spacer for maintaining a uniform cell gap between the first substrate and the second substrate, and is fixed to either one of the first and second substrates. In this case, by forming a protrusion on the substrate to fix and couple the column spacer, the flow of the first substrate and the second substrate can be suppressed, and the first substrate or the second substrate is affected by an external impact. The sliding and the warping of the first and second substrates can be prevented, thereby preventing an image quality defect of the liquid crystal display panel due to touch unevenness or poor pressing.

Claims (14)

A first substrate; A second substrate bonded to the first substrate; A thin film transistor formed on the first substrate; A plurality of dummy patterns formed on the first substrate and made of the same material on the same layer as the source / drain electrodes of the thin film transistor; A passivation layer formed on the first substrate including the plurality of dummy patterns and having a plurality of protrusions formed on the plurality of dummy patterns; A plurality of column spacers disposed between the first substrate and the second substrate and positioned in the plurality of protrusions; And And a liquid crystal layer formed in a cell gap between the first substrate and the second substrate. The liquid crystal display panel of claim 1, wherein the column spacer is formed on the second substrate. The liquid crystal display panel of claim 1, wherein the column spacer is formed on the first substrate. The liquid crystal display panel of claim 1, wherein the passivation layer including the protrusion is made of the same material as the column spacer. The liquid crystal display panel of claim 1, wherein the protrusion is formed with a constant spacing around the column spacer to prevent the flow of the column spacer. The method of claim 1, A plurality of gate lines arranged in a horizontal direction at regular intervals on the first substrate; And And a plurality of data lines uniformly spaced apart from each other on the first substrate and arranged in a vertical direction, the data lines defining pixels crossing the gate lines. The liquid crystal display panel of claim 6, wherein the dummy pattern is formed on the gate line. delete Forming a protective film on the surface of the first substrate; Forming a photoresist film on the protective film; Exposing and developing the photosensitive film through diffraction exposure or half-tone exposure to form a photoresist pattern for selectively exposing the protective film; Etching a passivation layer selectively exposed by the photoresist layer pattern to form a plurality of protrusions on the passivation layer surface; Forming a plurality of column spacers on the second substrate; And And bonding the first substrate and the second substrate so that the column spacer is positioned and fixed in the plurality of protrusions formed on the first substrate. The method of claim 9, further comprising forming a liquid crystal layer in a cell gap between the first substrate and the second substrate. The method of claim 9, further comprising forming a thin film transistor on the first substrate before forming a protective film on the surface of the first substrate. Patterning a gateline over the first substrate; Forming a gate insulating layer on the first substrate on which the gate line is patterned; Forming a plurality of dummy patterns of the same material as the source / drain electrodes on the gate insulating film in the region where the gate line is formed, while forming a source / drain electrode on the gate insulating film; Forming a passivation layer on the first substrate including the source / drain electrodes and a plurality of dummy patterns; Forming a plurality of column spacers on the second substrate; And And bonding the first substrate and the second substrate to each other, wherein the passivation layer has a plurality of protrusions formed on the plurality of dummy patterns. The method of claim 12, wherein the column spacer is positioned and fixed in a plurality of protrusions formed on the first substrate. The method of claim 12, wherein the forming of the plurality of column spacers on the second substrate is performed. Forming a black matrix on the second substrate; Forming red, green, and blue color filters on the second substrate on which the black matrix is formed; Forming an overcoat layer on an upper surface of the second substrate on which the black matrix and the red, green, and blue color filters are formed; And And forming a column spacer on the overcoat layer.

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