KR20070036416A - Liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a method of manufacturing the same, which are formed by giving a step on a color filter substrate to have different cell gaps for different regions, thereby solving touch defects and gravity defects, and the like, and the liquid crystal display device of the present invention. Corresponds to a first substrate and a second substrate facing each other, a plurality of gate lines and data lines crossing each other on the first substrate to define a pixel region, and an area excluding the pixel region on the second substrate. A black matrix layer formed on the second substrate, a first color filter formed in a stripe form on the second substrate, parallel to the predetermined data line, and passing through pixel areas on adjacent lines of the data line; A second color filter formed in an island shape corresponding to the remaining pixel areas in which the first color filter is not formed, and the black matrix layer A first column spacer formed on the first color filter in the upper part, a second column spacer formed on the black matrix layer on which the second color filter between the adjacent pixel regions is not formed, and the first and second substrates; Characterized by including a liquid crystal layer.

Stripe color filter, color filter on island, level difference, poor gravity, bad touch, paint stain

Description

Liquid crystal display device and method for manufacturing the same

1 is a cross-sectional view of an LCD including a column spacer.

2A and 2B are plan and cross-sectional views illustrating a touch failure of a liquid crystal display including a column spacer.

3 is a cross-sectional view of a liquid crystal display device in which gravity failure occurs.

4 is a cross-sectional view schematically illustrating a protrusion structure of the liquid crystal display device.

5 is a plan view illustrating a liquid crystal display device first substrate of the present invention.

FIG. 6 is a plan view illustrating an example of a structure formed on a second substrate opposite to the first substrate of FIG. 5;

FIG. 7 is a structural cross-sectional view taken along lines II ′ and II ′ II ′ of FIG. 6.

8A through 8C are process plan views illustrating a process of forming a structure on a second substrate of FIG. 6.

9A to 9C are process plan views illustrating a process of forming a structure on a second substrate of a liquid crystal display of the present invention.

10 is a cross-sectional view taken along line III-III ', IV-IV', and V-V 'of FIG. 9C.

* Description of Symbols Representing Major Parts of Drawings *

100: first substrate 101: gate line

101a: gate electrode 102: data line

102a: source electrode 102b: drain electrode

103: pixel electrode 103a: first storage electrode

104: common electrode 104a: common line

104b: second storage electrode 105: gate insulating film

106: protective film 106a: contact hole

200: second substrate 201, 301: black matrix layer

202, 302: color filter layer 302a: stripe color filter layer

302b, 302c: Island color filter layer 303: Overcoat layer

310: first column spacer 320: second column spacer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a method of manufacturing the same, formed by giving a step on a color filter substrate to have a different cell gap for each region, thereby solving touch defects and gravity defects. will be.

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 (ELDs), and vacuum fluorescence (VFDs) have been developed. 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 is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the use of the present invention has been developed in various ways such as a television and a computer monitor 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 for realizing an image is formed on the color filter layer.

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 is called a twisted nematic (TN) mode liquid crystal display, and the TN mode liquid crystal display has a disadvantage of having a narrow viewing angle, and thus an in-plane (IPS: In-Plane) for overcoming the disadvantages of the TN mode. Switching mode liquid crystal display device has been developed.

In the transverse electric field (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.

2A and 2B are plan and cross-sectional views illustrating a touch failure of a liquid crystal display including a column spacer.

As shown in FIGS. 2A and 2B, when the liquid crystal display device including the above-described conventional column spacer touches the surface of the liquid crystal panel 10 in a predetermined direction using a hand or other object, the touched portion Stain occurs at 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.

Such a touch failure is considered to be large because the contact area between the column spacer 20 and the first substrate 1 facing the column spacer 20 is larger than the structure of the previous ball spacer. That is, since the column spacer 20 formed in a cylindrical shape compared to the ball spacer has a large contact area with the first substrate 1 as shown in FIG. 2B, the first and second substrates 1 and 2 are touched. After the liver is shifted, it takes a long time to restore to the original state, so the stain remains until the original state is restored.

3 is a cross-sectional view illustrating a liquid crystal display device in which gravity failure occurs.

As shown in FIG. 3, the liquid crystal 3 is filled between the first and second substrates 1 and 2 facing each other, and the liquid crystal in which the column spacer 20 is formed at a predetermined portion between the first and second substrates. When the display device is in an upright state and is in a high temperature environment, when the liquid crystal is thermally expanded and the cell gap increases according to the height of the column spacer 20, the liquid crystal 3 flows down the lower end to bulge the lower end. Visible gravity failures are observed.

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, formed by giving a step on the color filter substrate, to have a different cell gap for each area, to solve the touch failure and gravity failure and the like and a manufacturing thereof The purpose is to provide a method.

In order to achieve the above object, a liquid crystal display of the present invention includes a first substrate and a second substrate facing each other, a plurality of gate lines and data lines crossing each other on the first substrate to define a pixel region, A black matrix layer formed on the second substrate so as to correspond to an area excluding the pixel region, and a stripe pattern formed on the second substrate, passing through pixel regions on a line parallel to the predetermined data line and adjacent to the data line; A first color filter formed, a second color filter formed in an island shape corresponding to the remaining pixel areas in which the first color filter is not formed on the second substrate, and on the first color filter on the black matrix layer. A first column spacer formed in the upper portion of the black matrix layer on which the second color filter between the adjacent pixel regions is not formed It is characterized in that it comprises a second column spacer formed in the liquid crystal layer formed between the first and second substrates.

An overcoat layer is further formed on the entire surface of the second substrate above the first color filter and the second color filter. The viscosity of the overcoat layer is 1 to 6 mPa · s.

A common electrode is further formed on the entire surface of the second substrate above the first color filter and the second color filter.

The thin film transistor may further include a thin film transistor formed at an intersection of the gate line and the data line.

The black matrix layer is further formed on the second substrate to correspond to the thin film transistor.

The first color filter is formed for each pixel area on a vertical line adjacent to n data lines of n (n is a natural number of 2 or more).

N is 3.

The first color filter is formed of a color film of the same color for each corresponding pixel area on the vertical line.

The second color filter is formed of a plurality of color films corresponding to pixel regions on a plurality of vertical lines, respectively, and corresponding to different colors for each vertical line.

The first color filter and the second color filter are the same height.

The sum of the thicknesses of the first color filter and the overcoat layer on the first color filter is greater than the thickness of the second color filter.

In addition, the manufacturing method of the liquid crystal display device of the present invention for achieving the same object comprises the steps of preparing a first, a second substrate, a gate line and a data line to define a pixel region cross each other on the first substrate; Forming a thin film transistor array including a thin film transistor array; forming a black matrix layer on the second substrate corresponding to a region excluding the pixel region; and forming the thin film transistor array on a second substrate including the black matrix layer. Forming a first color filter on a stripe parallel to the data line and passing through pixel areas on adjacent lines of the data line, and in remaining pixel areas in which the first color filter is not formed on the second substrate. Forming a second color filter correspondingly on the island, and forming a first color filter on the first color filter on the black matrix layer. Forming a second column spacer on the black matrix layer between the column spacer and an adjacent pixel region in which the second color filter is not formed, and forming a liquid crystal on one of the first substrate and the second substrate. And a step of dropping the substrate and inverting the substrate on which the liquid crystal is not dropped, and bonding the first substrate and the second substrate to face each other.

After forming the second color filter, the method may further include forming an overcoat layer on the entire surface of the second substrate.

After forming the second color filter, the method may further include forming a common electrode on the entire surface of the second substrate.

The first color filter is formed for each pixel area on a vertical line adjacent to n (n is a natural number of 2 or more) data lines.

N is 3.

The first color filter and the second color filter are the same height.

The sum of the thicknesses of the first color filter and the overcoat layer on the first color filter is greater than the thickness of the second color filter.

Recently, a method of reducing contact area between a column spacer and an opposing substrate by providing a protrusion having a corresponding surface smaller than the column spacer corresponding surface at a predetermined portion corresponding to the column spacer in order to improve a problem such as poor touch of a conventional liquid crystal display device. Is being proposed.

4 is a cross-sectional view schematically illustrating the protrusion structure of the liquid crystal display device.

As shown in FIG. 4, the liquid crystal display including the protrusion structure includes a first substrate 60 and a second substrate 70 facing each other, a column spacer 80 formed at a predetermined portion on the first substrate 60, and The protrusion 85 and the first and second substrates 60, which are formed on the second substrate 70 so as to have a smaller volume than the column spacer 80 and partially contact the column spacer 80. It comprises a liquid crystal layer (not shown) filled between 70).

As such, when the protrusions 85 are included, the first substrate 60 or the second substrate 60 may be touched when the surface of the first substrate 60 or the second substrate 70 is touched (or rubbed in one direction). When the substrate 70 is shifted relative to the opposing substrate, the contact area between the column spacer 80 and the protrusion 85 is the upper surface of the column spacer 80 (the first substrate 60 having the column spacer formed thereon). In this case, the surface corresponding to the column spacer on the surface of the first substrate 60 is reduced to the upper area of the relatively small protrusions 85 as compared to the lower surface, so that the column is reduced due to the reduced friction area. The friction force between the spacer 80 and the second substrate 70, which is the opposing substrate, is reduced, and thus, when the first substrate 60 or the second substrate 70 is pushed in one direction by the touch, it is in an original state. It is easy to restore.

However, in the case where the protrusion 85 having a smaller volume and surface area is used as compared with the column spacer 80 having such a shape, if the degree of depression of the column spacer due to external pressure becomes severe, plastic deformation occurs and recovery to the original state is impossible. Thus, after the step, this part is observed in the state of poor film (bad coating).

Hereinafter, a liquid crystal display device having a protrusion structure, a liquid crystal display device according to the present invention and a manufacturing method thereof, which may solve touch defects and gravity defects by improving problems of the protrusion structure, will be described in detail with reference to the drawings. .

5 is a plan view illustrating a liquid crystal display device first substrate of the present invention.

The liquid crystal display device of the present invention is largely a liquid crystal layer filled between the first substrate 100 and the second substrate (see 300 in FIG. 10) and the first and second substrates 100 and 300 facing each other. Not shown).

On the first substrate 100, a thin film transistor TFT formed at an intersection of the gate line 101 and the data line 102 and the gate line 101 and the data line 102 that cross each other to define a pixel area. ), A first storage electrode 103a electrically connected to the drain electrode 102b of the thin film transistor TFT, a pixel electrode 103 branched from the first storage electrode 103a, and the pixel electrode. A branched common electrode 104 alternated with 103 and a common line 104a and the common line 104a and the common electrode 104 formed in the pixel area in parallel with the gate line 101 in parallel with each other. And a second storage electrode 104b connected to the first storage electrode 103a and overlapping the first storage electrode 103a.

In this case, the thin film transistor TFT is defined in a region between a source electrode 102a and a drain electrode 102b having a 'U' shape, and the channel is formed along the inside of the shape of the source electrode 102a. It is defined as U '. The thin film transistor TFT may include a gate electrode 101a protruding from the gate line 101, a 'U' source electrode 102a protruding from the data line 102, and the 'U'. The drain electrode 102b is formed to be spaced apart from the female source electrode 102a by a predetermined interval and enters into the 'U' shaped source electrode 102a. A semiconductor layer (not shown) is further formed below the data line 102, the source electrode 102a, the drain electrode 102b, and the channel region between the source electrode 102a and the drain electrode 102b. . Here, the semiconductor layer is formed of a laminate of an amorphous silicon layer (not shown) and an n + layer (impurity layer) (not shown) from below, and corresponds to a region between the source electrode 102a and the drain electrode 102b. In the channel region, the n + layer (impurity layer) is removed. The semiconductor layer may be selectively formed only under the source / drain electrodes 102a and 102b and the region therebetween, or the data line 102, the source electrode 102a and the region except for the channel region. It may be formed under the drain electrode 102b. Meanwhile, as illustrated, the shape of the source electrode 102a is 'U', and the liquid crystal display having the 'U' channel has been described. However, the liquid crystal display of the present invention is the source electrode 102a. May be formed to protrude from the data line 102 in a '-' shape, or may be formed in other shapes.

Here, the gate line 101, the common line 104a, and the common electrode 104 are formed of the same metal on the same layer.

A gate insulating film 105 is interposed between the gate line 101 and the semiconductor layer, and a protective film 106 is interposed between the data line 102 and the pixel electrode 103.

Meanwhile, a second storage electrode 104b connected to the common line 104a passing through the pixel region, a first storage electrode 103a formed thereon, a gate insulating layer 105 interposed between the two electrodes, and The passivation layer 106 forms a storage capacitor.

Here, the drain electrode 102b and the first storage electrode 103a formed between the different layers may be contact holes 106a formed by removing the passivation layer 106 on an upper portion of the drain electrode 102b. Contact via).

A passivation layer 106 is further disposed on the data line 102 layer except for the contact hole 106a.

On the other hand, the first and second column spacers 310 and 320 have a horizontal cross-section in various shapes such as a polygon such as a circle or a square, and the gate line 101, the common line 104a, or the common line 104a. It may be formed on the second substrate (see 300 in FIG. 10) corresponding to the integrated second storage electrode 104b. In consideration of the alignment margin in the process, it may be advantageous to form a circular or regular polygon.

FIG. 6 is a plan view illustrating an example in which a liquid crystal display having a protrusion structure is formed on a second substrate facing the first substrate of FIG. 5, and FIG. 7 is a line along line II ′ of FIG. 6 and lines II to II. 'Structural cross section.

6 and 7, the first, second, and third color filters 202a, 202b, and 202c are formed on a stripe. In this case, the first to third color filters 202a, 202b, and 202c may be any one of R, G, and B color filters, respectively. The first to third color filters 202a, 202b, and 202c are formed to pass each pixel region in a direction parallel to the data line (vertical direction). In this case, the first and second column spacers 210 and 220 corresponding to the gate line are formed on the layer in which the black matrix layer 201, the color filter 202, and the overcoat layer 203 are stacked. Is formed. Therefore, there are almost no steps, and the first and second column spacers 210 and 220 are formed on the even plane.

However, since the first column spacer 210 is formed at a portion corresponding to the protrusion 120, the first column spacer 210 is in contact with the upper portion of the protrusion 120, and the second column spacer 220 is on the upper portion of the first substrate 100. It is formed to be spaced apart from the side by a predetermined interval.

In this case, after the bonding of the first and second substrates 100 and 200, the column may be caused by the protrusions 120 when the first or second substrates 100 and 200 are pushed or skimmed in one direction. Touch failure is prevented due to the reduction of the contact area with the spacer.

However, in the structure including the projections, a process for forming the projections is added, and when the position between the projections and the column spacer is not aligned correctly, there is a problem that it is difficult to obtain a desired touch defect improvement.

The color filter array formed on the second substrate of the structure shown in FIG. 6 is formed as follows.

8A through 8C are process plan views illustrating a process of forming a structure on the second substrate of FIG. 6.

As shown in FIG. 8A, a black matrix layer 201 having a mesh structure is formed on the second substrate (see 200 of FIG. 7) corresponding to a region other than the pixel region. The pixel area is defined as an area defined by a portion where the gate line and the data line cross each other. In some cases, the black matrix layer may be formed to cover the thin film transistor at the intersection of the gate line and the data line.

As illustrated in FIG. 8B, the color filter layer 202 having a shape passing through the pixel area on the vertical line in the direction parallel to the data line is formed. The illustrated figure shows a state in which the color filter layers are formed of the first to third color filters 202a, 202b, and 202c, and the first to third color filters 202a, 202b, and 202c are R, G, and B, respectively. Color films may be formed to correspond in turn. In some cases, color films having three or more colors may be formed in sequence.

As illustrated in FIG. 8C, an overcoat layer 203 of FIG. 7 is entirely deposited on the first to third color filters 202a, 202b, and 202c.

Subsequently, column spacers 210 and 220 are formed on the overcoat layer 203 corresponding to a predetermined portion on the gate line. On the plan view of FIG. 5, when the protrusions 85 are formed at predetermined portions on the gate line, the first column spacers 210 formed corresponding to the protrusions are column spacers that maintain cell gaps. The second column spacer 220 corresponding to the non-formed gate line 101 is a depression preventing column spacer. The second column spacer 220 is not in contact with the upper surface of the first substrate 100 at a predetermined interval in a bonded state, but if an external pressure of a predetermined pressure or more is applied to the upper surface of the first substrate 100. The cell gap function of the first column spacer 210 is shared, and the first column spacer 210 is pressed to serve to prevent plastic deformation.

As described above, the protrusion structure as described above should further form a separate protrusion in the thin film transistor array process, and when the external pressure is applied to the first column spacer for maintaining the cell gap on the flat second substrate, The first column spacer should simultaneously form a second column spacer to prevent crushing. In this case, it is not uniformly formed in the process of the projection pattern, the column spacers formed on the color filter on the different steps do not maintain the desired distance or contact with the opposing substrate, there was a problem that can not solve the defect. In addition, process and productivity deterioration may occur due to more than the ability to adjust the process, and in the case of high resolution, secondary problems such as reduction of storage capacitors and lack of space for patterning may occur. It is a fact.

In the liquid crystal display of the present invention described below, for example, assuming that a color filter of a predetermined color is repeated for each pixel area on three vertical lines, the liquid crystal display of the present invention corresponds to a first pixel area corresponding to the pixel areas on the first vertical line. The color filter is formed in a stripe shape, and the second color filter corresponding to the pixel areas on the second vertical line and the third color filter corresponding to the pixel areas on the third vertical line respectively correspond to the pixel area. Form into islands of size. In this case, when the column spacer is formed corresponding to the upper portion of the black matrix layer corresponding to the gate line on the first substrate (lower substrate), the first column spacer that is responsible for the cell gap is formed to correspond to the upper portion of the first color filter. In the bonded state, the second column spacer maintaining the state spaced apart from the first substrate is formed between the second color filters between the pixel regions on the adjacent vertical lines or between the third color filters between the pixel regions on the adjacent vertical lines. Without forming a structure (protrusion), a dual gap is formed only by the step on the color filter.

Hereinafter, the color filter array process formed on the second substrate in the liquid crystal display of the present invention will be described with reference to the accompanying drawings.

9A to 9C are process plan views illustrating a process of forming a structure on a second substrate of the liquid crystal display of the present invention, and FIG. 10 is a line III-III ', IV-IV', and V-V 'of FIG. 9C. It is a structural cross section.

As shown in FIG. 9A, a black matrix layer 301 is formed on the second substrate 300.

Here, the black matrix layer 301 is formed corresponding to an area except the pixel area. The pixel region is defined as an area (lattice shape) defined by a portion where the gate line and the data line cross each other. In some cases, the black matrix layer may be formed to cover the thin film transistor at the intersection of the gate line and the data line.

9B shows a state in which the first color filter 302a on the stripe and the second and third color filters 302b and 302c formed in an island shape are formed on the second substrate 300. The shapes of the first to second color filters 302a, 302b, and 302c are as follows.

That is, the first color filter 302a formed on the second substrate 300 on which the black matrix layer 301 is formed to pass through the pixel region on the first vertical line and the second vertical line on the second substrate 300. A second color filter 302b formed in an island shape corresponding to the pixel area and a third color filter 302c formed in an island shape corresponding to the pixel area on the third vertical line are formed. Here, the second and third color filters 302b and 302c on the island are formed to be larger than or equal to the size of the pixel area, and are formed to be spaced apart from each other by a predetermined interval.

The first color filter 302a may be made of an R color film, the second color filter 302b is made of a G color film, and the third color filter 302c may be made of a B color film, Accordingly, each color film may be arranged in a different order of colors. The illustrated figure is an example in which the color film consists of three colors, and in some cases, the color arrangement may be formed by increasing the number to four or more.

The color film is the easiest to pattern since the resolution is the lowest resolution among the structures formed on the second substrate. For example, the gate line width corresponds to a width of several tens of micrometers or more, and the spacing between the plurality of second color filters or the third color filters corresponds to the gate line width, respectively, so that island-like patterning is sufficiently possible. Do.

FIG. 9C illustrates the black matrix layer 301 and the first to third color filters 302a, 302b, and 302c formed together on the second substrate 300. The second color filters 302b are spaced apart from each other, where the black matrix layer 301 is exposed. Similarly, the third color filters 302c between adjacent pixel regions on the vertical line are spaced apart from each other, and the black matrix layer 301 is exposed at this region.

As shown in FIGS. 9C and 10, an overcoat layer (FIG. 1) is formed on the second substrate 300 including the first color filter 302a on the stripe, the second color filter 302b on the island, and the third color filter 302c. 10, see 303). Here, the upper surface of the overcoat layer 303 is the first color filter 302a, the second color filter 302b and the third color filter 302c is not formed after the surface planarization, the first to the first Since the level difference of the three color filters 302a, 302b, and 302c must be maintained to some extent, the viscosity of the material forming the overcoat layer 303 during deposition is important. For example, the overcoat layer 303 is formed of a material having a viscosity in the range of 1 to 6 mPa · s (preferably experimentally 2 to 3 mPa · s) (mPa · s = cP) to form the first coat. The level difference of the third to third color filters 302a, 302b, and 302c is maintained.

A column spacer is formed at a predetermined portion of the overcoat layer 303 corresponding to the gate line. In this case, the first column spacer 310 is formed on the first color filter 302a on the stripe. That is, the overcoat layer 303, the first color filter 302a, and the black matrix layer 301 are formed in the lower portion of the first column spacer 310 in order from the top.

In addition, the second column spacer 320 is formed between the second color filter 302b or the third color filter 302c on the island, and in order from the top to the bottom of the second column spacer 320. The overcoat layer 303 and the black matrix layer 301 are laminated | stacked. Therefore, since the second column spacer 320 is formed corresponding to the relatively low stepped portion, even if the first and second column spacers 310 and 320 are formed in the same process, the second column spacer 320 is formed. ) Is located at a position where the upper surface is relatively lower than the first column spacer 310.

In this case, a portion where the black matrix layer is exposed between adjacent pixel regions is a portion where the gate line corresponds, and then a second column spacer is formed corresponding to the portion. A first column spacer is formed on the black matrix layer corresponding to the gate line through which the first color filter 302a passes.

On the other hand, the overcoat layer 303 is formed when the liquid crystal display device is in the transverse electric field mode (IPS mode), and in some cases, when the liquid crystal display device is in the TN mode, the overcoat layer is replaced by a common electrode. Can be.

In FIG. 10, reference numerals not described on the first substrate 100 will be described. 105 is a gate insulating film formed on the entire surface of the first substrate 100 including the gate line 101, and 106 is formed on the gate insulating film. It is a protective film.

 Referring to the first and second column spacers 310 and 320 formed between the pixel areas on the vertical line through FIG. 10, the first column spacer 310 formed on the first color filter 302a on the stripe. The top surface of the first substrate 100, in the illustrated figure, is in contact with the protective film 106 to maintain the cell gap, and the third color filter 302c between the second color filters 302b on the island or on the island. The second column spacer 320 formed between the first and second spacers 320 maintains a predetermined distance from the uppermost surface of the first substrate 100 when bonded, and contacts the protective layer 106 at a predetermined pressure or more when an external pressure is applied. Thus, the cell gap support function of the first column spacer 310 may be shared and be in charge.

As described above, in the above-described liquid crystal display of the present invention, the contact points of the first and second column spacers 310 and 320 are different depending on the pressure applied to the back surfaces of the first and second substrates 100 and 300. Thus, when bonding, only the first column spacer 310 of the entire column spacers is in contact with the first substrate 100 to prevent plastic deformation of the column spacer due to pressing, and to reduce the contact area at the time of touch. Recovery to the back state is easy, and luminance unevenness can be prevented.

The embodiment described above has been described with respect to the in-plane switching (IPS) mode, and may be applicable to the twisted nematic (TN) mode. In the case of the twisted nematic mode, the pixel electrodes are formed in one pattern on the pixel area of the first substrate, and the common electric field is formed on the front surface of the second substrate. Is formed. In the twisted nematic mode, since the common line is not formed inside the pixel region, the first and second column spacers and the protrusions are all formed on the gate line.

The liquid crystal display of the present invention as described above and a method of manufacturing the same have the following effects.

In the recent manufacture of liquid crystal display devices, efforts to solve problems such as touch, gravity, and paint staining by varying the degree of correspondence of the column spacer and the opposing substrate according to the area according to the expansion of the liquid crystal dropping process and the trend of large area high resolution. This is in progress. However, despite these efforts, there have been many problems (for example, problems of paint stains (pressed stains) in the projection structures).

In the liquid crystal display of the present invention and a method for manufacturing the same, each color filter layer is formed in a stripe or an island shape at the time of forming the color filter layer, and the counter substrate corresponding degree (space or contact degree) for each column spacer is changed. Therefore, by arranging column spacers of the same thickness on different heights, only a part of the column spacers are brought into contact with the opposing substrate during the touch, thereby reducing the contact area, thereby facilitating the recovery to the original state during the touch, resulting in poor touch (uneven luminance of black). After the bonding, if a predetermined external pressure is further applied, the column spacer maintaining the spaced apart state at the time of bonding at a predetermined pressure or more is in contact with the opposing substrate to share the supporting function to concentrate the pressure concentrated on some column spacers. It can be dispersed to prevent plastic deformation.

The level of customer demand for image quality through the large screen high resolution trend and the fierce competition of the liquid crystal display device is gradually increasing. In the same way, the productivity is also gradually progressed to a large quantity trend, so the simplicity of production and the simplicity of production are also important items. Therefore, since the automatic double gap concept through the simplicity of production when applying this structure, it is expected that the quality level of image quality is also equal to or higher than the projection structure.

Claims (19)

A first substrate and a second substrate facing each other; A plurality of gate lines and data lines crossing each other on the first substrate to define pixel regions; A black matrix layer formed on the second substrate to correspond to a region other than the pixel region; A first color filter parallel to the predetermined data line on the second substrate and formed in a stripe pattern passing through pixel areas on adjacent lines of the data line; A second color filter formed in an island shape corresponding to the remaining pixel areas in which the first color filter is not formed on the second substrate; A first column spacer formed on the first color filter on the black matrix layer; A second column spacer formed on the black matrix layer where the second color filter between the adjacent pixel areas is not formed; And And a liquid crystal layer formed between the first and second substrates. The method of claim 1, And an overcoat layer further formed on an entire surface of the second substrate above the first color filter and the second color filter. The method of claim 2, The viscosity of the said overcoat layer is 1-6 mPa * s, The liquid crystal display device characterized by the above-mentioned. The method of claim 1, And a common electrode formed on an entire surface of the second substrate above the first color filter and the second color filter. The method of claim 1, And a thin film transistor formed at an intersection of the gate line and the data line. The method of claim 5, And a black matrix layer is further formed on the second substrate to correspond to the thin film transistor. The method of claim 1, And one first color filter for each pixel area on a vertical line adjacent to n (n is a natural number of two or more) data lines. The method of claim 7, wherein N is 3, the liquid crystal display device. The method of claim 8, And the first color filter is formed of a color film of the same color for each corresponding pixel area on the vertical line. The method of claim 1, And the second color filter is formed of a plurality of color films corresponding to pixel regions on a plurality of vertical lines, respectively, and corresponding colors are different for each vertical line. The method of claim 1, And the first color filter and the second color filter are the same height. The method of claim 1, The sum of the thicknesses of the first color filter and the overcoat layer on the first color filter is greater than the thickness of the second color filter. Preparing a first and a second substrate; Forming a thin film transistor array on the first substrate, the thin film transistor array including a gate line and a data line crossing each other to define a pixel area; Forming a black matrix layer on the second substrate corresponding to a region excluding the pixel region; Forming a first color filter on a second substrate including the black matrix layer in a stripe pattern, parallel to the predetermined data line and passing through pixel areas on adjacent lines of the data line; Forming a second color filter on an island in correspondence with the remaining pixel areas in which the first color filter is not formed; Forming a second column spacer on the black matrix layer between the first column spacer on the first color filter on the black matrix layer and an adjacent pixel region where the second color filter is not formed; Dropping liquid crystal onto any one of the first substrate and the second substrate; And And inverting the substrate on which the liquid crystal is not dropped, and bonding the first and second substrates together to face each other. The method of claim 13, And forming an overcoat layer on the entire surface of the second substrate after forming the second color filter. The method of claim 13, And forming a common electrode on the entire surface of the second substrate after forming the second color filter. The method of claim 13, Wherein the first color filter is formed for each pixel area on a vertical line adjacent to n (n is a natural number of two or more) data lines. The method of claim 16, N is 3, the method for manufacturing a liquid crystal display device. The method of claim 13, The first color filter and the second color filter are the same height, the manufacturing method of the liquid crystal display device. The method of claim 13, The sum of the thicknesses of the first color filter and the overcoat layer on the first color filter is greater than the thickness of the second color filter.

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