KR20080060825A - Liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

An LCD(Liquid Crystal Display) and a manufacturing method thereof are provided to locate column spacers at the circumference of a contact hole by using a step at the contact hole. The first and second substrates are located oppositely to each other. Plural gate lines and data lines are formed on the first substrate and crossed with each other and define plural pixel areas. Plural TFT(Thin Film Transistor)s are formed at the crossing points of the gate and data lines. A pixel electrode is formed at each pixel area. An organic insulating layer is interposed between each TFT and each pixel electrode. A portion of the organic insulating layer is etched so that a contact hole(120) is defined and connects the TFT with the pixel electrode. Plural first column spacers(210a) are formed on the second substrate. The spacers correspond to each contact hole among plural contact holes are overlapped with the circumference and a predetermined portion of the corresponding contact hole, and overlapped with another portion of the adjacent contact hole. A liquid crystal layer is filled between the first and second substrates.

Description

Liquid crystal display device and method for manufacturing the same

1 is a cross-sectional view showing a liquid crystal display device including a conventional column spacer.

2A and 2B are plan and cross-sectional views illustrating a liquid crystal panel in which touch failure occurs.

3 is a cross-sectional view of a liquid crystal display including a protrusion structure.

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

5 is an enlarged plan view corresponding to two adjacent subpixels of FIG. 4;

6 is a cross-sectional view taken along line II ′ of FIG. 5.

7 is a plan view illustrating column spacers adjacent to each other vertically and contact holes corresponding to each column spacer in the liquid crystal display of the present invention.

FIG. 8 is a cross-sectional view illustrating column spacers and protrusions formed on horizontal lines passing through the centers of adjacent contact holes of FIG. 7; FIG.

9A and 9B are schematic views illustrating contact hole correspondence relationships before and after touch of column spacers formed on horizontal lines passing through the centers of adjacent contact holes in the liquid crystal display 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

106: gate insulating film 107: interlayer insulating film

107b: main part 120: contact hole

200: second substrate 201: black matrix layer

202: color filter layer 203: common electrode

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, which can prevent touch failure and gravity failure in a structure using an organic insulating film as a protective film.

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 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 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 the array process on the first substrate or the second substrate, it is fixed is formed in a column shape having a predetermined height on a 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.

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

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.

The present invention has been made to solve the above problems and to provide a liquid crystal display device and a method of manufacturing the same that can prevent a touch failure in a structure using an organic insulating film as a protective film.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a first substrate and a second substrate facing each other, a plurality of gate lines formed to define a plurality of pixel regions crossing each other on the first substrate, and A plurality of thin film transistors formed at an intersection of each of the gate lines and the data lines, a pixel electrode formed corresponding to each pixel region, an organic insulating film formed between the layers of the thin film transistors and the pixel electrodes; A contact hole connecting the thin film transistor corresponding to each pixel region defined by removing a portion of the organic insulating layer and the pixel electrode, and one contact hole corresponding to each of the plurality of contact holes, Overlaps a predetermined portion with the surroundings, and overlaps a different portion with respect to an adjacent contact hole. It is characterized in that it comprises a plurality of first column spacer formed on the second substrate and a liquid crystal layer filled between the first substrate and the second substrate.

The sum of the contact areas at the periphery of the contact holes that are adjacent to each other adjacent first column spacers among the column spacers formed on the same line is smaller than the bottom surface area corresponding to the first substrate of the first column spacer.

A plurality of second column spacers is further formed on the second substrate to be spaced apart from the organic insulating layer.

The second column spacer is formed to correspond to the gate line.

In the organic insulating layer corresponding to the second column spacer, recesses of which a part thickness is removed are formed.

The plurality of first column spacers are formed in the same size, respectively.

The column spacers corresponding to four adjacent up, down, left, and right contact holes among the plurality of contact holes are formed to correspond to the periphery of the lower part, the upper part, the right part, and the left part of each corresponding contact hole.

Each of the column spacers has one of circular and polygonal shapes of a corresponding surface with respect to the second substrate.

The contact holes are formed in any one of a circle and a polygon when viewed from the surface of the organic insulating layer.

The thin film transistor may include a gate electrode protruding from the gate line, a source electrode protruding from the data line, a drain electrode spaced apart from the source electrode and formed on the same layer as the source electrode, and the source electrode / top on the gate electrode. And a semiconductor layer formed to partially overlap with the drain electrode.

The color filter array is formed on the second substrate. The color filter array includes a black matrix layer and a color filter layer. It further comprises an overcoat layer in the color filter array.

The pixel area on the first substrate may further include a common electrode alternate with the pixel electrode.

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 substrate and a second substrate facing each other, and defining a plurality of pixel regions cross each other on the first substrate; Forming a plurality of gate lines and data lines, forming a plurality of thin film transistors formed at intersections of the gate lines and data lines, and forming an organic insulating layer on the first substrate including the plurality of thin film transistors. Forming a contact hole corresponding to an upper portion of the thin film transistor, forming a contact hole in a portion of the organic insulating layer, forming a pixel electrode in each pixel region, and for each of the plurality of contact holes, One contact hole corresponds to the contact hole and overlaps a predetermined portion with the surroundings of the contact hole. And overlapping another portion with each other to form a plurality of first column spacers on the second substrate and forming a liquid crystal layer filled between the first and second substrates. .

In the forming of the first column spacer, a plurality of second column spacers spaced apart from the organic insulating layer is formed on the second substrate.

The second column spacer is formed to correspond to the gate line.

At the same time as forming the contact hole of the organic insulating layer, a portion of the organic insulating layer corresponding to the second column spacer is removed to form recesses.

The formation of the contact hole and the recessed portion of the organic insulating film uses a halftone mask.

The formation of contact holes and recesses in the organic insulating film uses a diffraction mask.

The recessed portion corresponds to the transflective portion of the halftone mask or the diffraction mask.

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

When one substrate and the opposite substrate are pushed when the substrate is touched, since the area of the column spacer and the opposite substrate is large and the frictional force is large, it takes a long time to recover to the original state, and a touch failure was observed, but the liquid crystal display of the present invention solves this problem. In order to make contact with the column spacer and the opposing substrate with a smaller area, a protrusion is formed at a position opposite the column spacer.

3 is a cross-sectional view illustrating a liquid crystal display including a protrusion structure.

As shown in FIG. 3, the liquid crystal display including the protrusion structure includes a first substrate 100 and a second substrate 200 facing each other, a column spacer 50 formed at a predetermined portion on the first substrate 100, and The protrusion 51 and the first and second substrates 100 and the protrusions 51 formed on the second substrate 200 to partially contact the column spacer 50 and have a relatively smaller volume than the column spacer 50. It comprises a liquid crystal layer (not shown) filled between the 200.

As such, when the protrusion 51 is included, when the surface of the first substrate 100 or the second substrate 200 is touched (rubbing or sweeping in one direction), the first substrate 100 or the second substrate may be used. When the substrate 200 is shifted relative to the counter substrate, the contact area between the column spacer 50 and the protrusion 51 is the upper surface of the column spacer 50 (the first substrate 100 having the column spacer formed thereon). Named based on, in this case, the surface corresponding to the column spacer on the surface of the first substrate 100 is reduced to the upper area of the protrusion 51, which is relatively small compared to the column spacer). The frictional area between the column spacer 50 and the second substrate 200, which is an opposing substrate, is reduced due to the reduction of the friction area with the protrusions. Thus, the first substrate 100 or the second substrate (in one direction) is touched by the touch. When 200) is pushed back, it is easy to restore to the original state .

However, in the structure in which the protrusion 51 corresponds to the center of the above-mentioned column spacer 50, when the pressure of the surface of the said 1st board | substrate 100 or the 2nd board | substrate 200 is applied, it is relatively column spacer. A phenomenon in which the column spacer 50, in which a force is concentrated, is pressed on a portion of the column spacer 50 corresponding to the protrusion 51 formed in a smaller size than the 50 occurs. If the pressing is severe, the column spacer 50 may not be restored to its original state even after the pressure is removed, and the site where such pressing occurs is visually observed, thereby deteriorating the characteristics of the display device.

The protrusion 51 and the column spacer 50 may have a circular shape as shown in the figure, or may be formed in a polygonal shape including a quadrangle or the like. In this case, the column spacer 50 and the protrusion 51 may have the same shape or may have different shapes. In any case, the protrusion 51 is formed to have a relatively small surface area (corresponding portion of the column spacer) with respect to the column spacer 50 so that the column when the first and second substrates 100 and 200 are bonded to each other. The spacer 50 is brought into contact with the second substrate 200, which is the opposing substrate, in a small area.

However, even when such projections are formed, when the organic insulating film is formed thereon, the organic insulating film is formed to the extent that both the upper surface and the periphery of the projections can be planarized. There is a need for other methods to improve touch and gravity failures.

Hereinafter, the liquid crystal display of the present invention and a method of manufacturing the same will be described in which the protrusion structure is omitted and the column spacer is formed corresponding to the peripheral region of the contact hole.

FIG. 4 is a plan view illustrating a liquid crystal display of the present invention, FIG. 5 is an enlarged plan view corresponding to two adjacent subpixels of FIG. 4, and FIG. 6 is a cross-sectional view taken along line II ′ of FIG. 5.

As shown in FIG. 4, the liquid crystal display of the present invention corresponds to the contact hole 120 of each pixel area (subpixel), so that one column spacer 210 is formed in the contact hole formed in two pixel areas in one direction. Correspondingly formed. That is, one column spacer 210 is formed in two contact holes 120 on the same line in one direction (X direction) and the other direction (Y direction) intersecting the same, and adjacent columns on the same line are adjacent to each other. The spacers 210 are formed in directions that are symmetrical to each other. Here, it is assumed that the position of the contact hole 120 is formed at the same position in every pixel area.

That is, when viewed in the vertical direction, the first column spacer 210a is formed to correspond to the upper edge of the contact hole 120, and corresponds to the lower edge of the contact hole 120 formed in the second pixel area in the same line downward. As a result, the third column spacer 210c is formed. Looking in the left and right directions, the third column spacer 210b is formed to correspond to the right edge of the contact hole 120, and corresponds to the left edge of the contact hole 120 formed in the second pixel area to the left in the same line. The fourth column spacer 210d is formed.

That is, the column spacers 210: 210a, 210b, 210c, and 210d corresponding to four adjacent up, down, left, and right contact holes 120 among the plurality of contact holes may each have a corresponding contact hole in a clockwise direction from above. It is formed corresponding to the periphery of the upper part, the right part, the lower part, and the left part.

Here, the column spacer 210 is in an original state when a part of the column spacer 210 is in contact with the periphery of the contact hole 120 to maintain a small contact area when the first and second substrates are bonded to each other and is pushed in one direction when the substrate is touched. It is easy to return to the furnace to prevent the touch failure. The column spacer 210 is in contact with the surface of the first substrate 100, which is an opposing substrate, under general bonding conditions, and is also referred to as a gap maintaining column spacer because of a function of maintaining a cell gap during bonding.

Referring to FIG. 5 and FIG. 6, the liquid crystal display of the present invention will be described in detail. The first substrate 100 and the second substrate 200 facing each other and the plurality of substrates intersecting each other on the first substrate 100 are provided. A plurality of gate lines 101 and data lines 102 defining two pixel regions, a plurality of thin film transistors TFT formed at intersections of the gate lines 101 and data lines 102, The pixel electrode 103 formed corresponding to each pixel region, the organic insulating film 107 formed between the thin film transistor TFT and the pixel electrode 103, and a portion of the organic insulating film 107 are removed. And a contact hole 120 connecting the thin film transistor corresponding to each pixel region and the pixel electrode 103 and one contact hole 120 to each of the plurality of contact holes 120. Corresponding part of the periphery of the contact hole 120 The plurality of column spacers 210, the first substrate 100, and the second substrate 200 overlapping each other with respect to the adjacent contact hole 120 and overlapping with each other are formed on the second substrate 200. It comprises a liquid crystal layer 250 filled in between.

Here, the shape of the source electrode 202a may be formed in a '-' shape or may be formed in a 'U' shape as shown. Or it may be formed in the 'L' shape. On the other hand, the 'U' shape has the effect of increasing the area of the channel to increase the efficiency of the thin film transistor.

Here, the sum of the contact areas around the contact holes 120 that the two adjacent column spacers 210 are in contact with each other among the column spacers 210 formed on the same line may correspond to the first substrate of the one column spacer 210. It is smaller than the area of the lower surface corresponding to 100).

Meanwhile, examples of the organic insulating layer 107 include BCB (Benzo Cyclo Butene) and photo acryl. As described above, the organic insulating film 107 used as the protective film of the present invention is a low dielectric material and reduces the parasitic capacitance between the pixel electrode 103 and the data line 102 which is a lower layer thereof, thereby reducing the parasitic capacitance. The degree of overlap between and the data line 102 can be increased, which is mainly used for high opening ratio structures.

In addition, a plurality of anti-pressing column spacers 220 may be further formed on the second substrate 200 while being spaced apart from the organic insulating layer 107 separately from the column spacers 210 for maintaining the cell gaps. . Here, the anti-press column spacer 220 is provided in order to avoid the pressure being applied to the column spacer having a small contact area when the external pressure is applied after bonding, and the anti-press column according to the external pressure condition to be applied to the liquid crystal panel. The number and value of the spacers 220 and the separation distance from the organic insulating layer 107 of the first substrate 100 may be adjusted.

Here, the anti-press column spacer 220 is formed to correspond to the gate line 101 or the data line 102, and the column spacer 210 corresponds to a periphery of the contact hole 120 to partially contact the same. Adjacent column spacers 210 having an area and formed on the same line are formed to be symmetrical with respect to the corresponding contact holes 120.

In this case, a recess 107b having some thickness removed is formed in the organic insulating layer 107 corresponding to the anti-press column spacer 220, and the recess 107b is formed together when the contact hole 120 is formed. . That is, the organic insulating layer 107 is formed and then exposed and developed once using a halftone mask or a diffraction exposure mask having a light blocking portion and a transflective portion corresponding to the contact hole 120 and the recessed portion 107b, respectively. Formed. In this case, the remaining area except for the light blocking part and the transflective part is defined as a transmission part. This is for the case where the organic insulating layer 107 has negative photosensitivity, and if the organic insulating layer 107 has a positive photosensitivity, the light shielding portion in the above description is replaced by a transmission portion, and the transmission portion is replaced with a light shielding portion. The mask is defined to have a reversed phase.

In addition, even though the plurality of column spacers 210 correspond to different regions of each contact hole 120, the plurality of column spacers 210 are formed to have the same size, so that a misalignment occurs, and each of the adjacent column spacers formed on the same line is formed. Even if the contact areas of are different, the sum of these contact areas is to have both before and after misalignment. Therefore, as a result, the structure of the liquid crystal display of the present invention does not increase the contact area even if a misalignment between the first and second substrates 100 and 200 occurs, and maintains a constant area, and the sum of these areas. By reducing the area of the lower surface of the column spacer 210, the touch surface of the first substrate 100 or the second substrate 200 may be reduced, thereby preventing touch failure.

Here, the contact area around the column spacer 210 and the contact hole 120 is the sum of the contact areas between two column spacers 210 symmetrically disposed on the same line and the vicinity of the contact hole 120. This is smaller than the lower area of the one column spacer 210.

The column spacers 210 may have any one of a circular shape and a polygonal shape of a corresponding surface with respect to the second substrate 200.

In addition, the contact holes 210 are formed in a shape of any one of a circle and a polygon as viewed from the surface of the organic insulating layer 107.

The thin film transistor TFT is spaced apart from the gate electrode 101a protruding from the gate line 101, the source electrode 102a protruding from the data line 102, and the source electrode 102a. And a semiconductor layer 104 formed to partially overlap the source electrode 102a / drain electrode 102b on the drain electrode 102b formed on the same layer as the source electrode 102a and the gate electrode 102a. It is made to include. Here, the semiconductor layer 104 is formed of a laminate of an amorphous silicon layer 104a and an impurity layer 104b formed to correspond to the lower side of the source electrode 102a and the drainage electrode 102b.

The color filter array is formed on the second substrate 200. The color filter array includes a black matrix layer 201 formed corresponding to an area except the pixel region (gate line, data line, and thin film transistor region) and a color filter layer 202 formed corresponding to at least a pixel region. . As shown in some cases, the color filter array may further include a common electrode 203 or an overcoat layer (not shown).

Although not shown, the pixel area on the first substrate 100 may further include a common electrode alternate with the pixel electrode. In this case, the common electrode 203 is omitted from the second substrate 200.

FIG. 7 is a plan view illustrating adjacent column spacers and protrusions corresponding to each column spacer in upper, lower, left, and right sides of the liquid crystal display of the present invention, and FIG. 8 is a column spacer formed on a horizontal line passing through the center of the adjacent protrusions of FIG. It is a sweet shave showing the protrusion.

As shown in FIGS. 7 and 8, for example, the contact holes 120 and the column spacers 210a, 210b, 210c, and 210d corresponding to the contact holes 120 in the upper, lower, left, and right pixel areas of FIG. 6 are the same. When viewed on a line, the column spacers adjacent to each other among collinear column spacers 210a, 210b, 210c, and 210d are disposed in opposite directions with respect to the contact hole 120. It is formed to be in contact. That is, in FIG. 7, the fourth column spacer 210d for the left contact hole is in contact with the left side of the contact hole 210 with respect to the contact holes 210 on the horizontal line, and in the right contact hole 120. The second column spacer 210b is in contact with the right portion of the contact hole. Similarly, with respect to the contact hole on the vertical line, the first column spacer 210a for the upper contact hole is in contact with the lower part of the contact hole, and the third column spacer 210c is in contact with the upper part of the contact hole.

As shown in FIG. 8, the vertical cross-sections of adjacent protrusions on the horizontal line and the column spacers corresponding thereto are the widths of the contact hole 210 and the width of a, respectively, of the second column spacer 210b and the fourth column spacer 210d. , it is in contact with the width of b. In this case, as shown in FIG. 8, the sum of the width of a and the width of b is smaller than the critical dimension of the lower surface of the one column spacer 210.

Here, the second column spacer 210b and the fourth column spacer 210d are in contact with the periphery of the contact hole 120 in the bonded state with the first and second substrates 100 and 200. In addition, the phenomenon in which the second column spacer and the fourth column spacers 210b and 210d may be pressed to a certain extent in the vicinity of the contact hole 120, that is, in contact with the pixel electrode 103, may be considered. have. Such pressing can prevent some degree of misalignment between the first and second substrates 100 and 200 due to touch.

9A and 9B are schematic views illustrating contact hole correspondence relationships before and after touch of column spacers formed on horizontal lines passing through the centers of adjacent contact holes in the liquid crystal display of the present invention.

In addition, even when a shift occurs between the first and second substrates 100 and 200 due to a touch, the column spacer has a partial plastic deformation over the edge of the contact hole 120 as shown in FIG. 9A. Even though 210b and 210d are out of the contact hole region by the shift as shown in FIG. 9B, a portion not met at the edge of the contact hole 120 is touched to maintain the contact area reduction effect when touched. Therefore, the friction force decreases as the friction surface decreases when touched, so that it is easy to return to the original state.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in Esau.

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

First, the column spacers are disposed at the edges of the contact holes, and are arranged in different areas such as top, right, bottom, and left in clockwise directions, respectively, corresponding to upper, lower, left, and right contact holes, and symmetrically with each other when viewed on the same line. In this case, even if a misalignment occurs in one direction, the contact area does not increase, and the return to the original state can be facilitated.

Second, especially in the structure using the organic insulating film as a protective film, even if the projection is formed, the surface of the organic insulating film is flattened, so that the step cannot be used due to the projection. By coordinating the column spacers around the holes, it is possible to obtain an effect of reducing touch defects without adding a separate process.

Third, in the case of the protrusion structure, the contact area reduction effect due to the touch failure could be intended, but when the misalignment degree due to the touch failure was severe, when the column spacer deviated from the protrusion, there was a problem in that it was structurally difficult. However, the present invention structurally moves the column spacers in the same plane around the contact hole, and also takes a symmetrical configuration with respect to the contact hole on the same line so as to prevent the top, bottom, left, and right sides from falling largely in one direction. It is easy to return to the original state.

Fourth, even if a shift occurs between the first and second substrates due to touch, and even if the column spacer partially extending over the contact hole is located in the planar organic protective film, plastic deformation (parts in contact with the contact hole periphery remains in contact). It is shifted to the original state, and it is easy to return to the original state by maintaining a small contact state.

Fifth, even if a misalignment between the first and second substrates occurs, the bonding density can be kept the same by the symmetrical structure, and a cell gap defect due to the misalignment can be detected.

Claims (21)

A first substrate and a second substrate facing each other; A plurality of gate lines and data lines formed on the first substrate to define a plurality of pixel regions crossing each other; A plurality of thin film transistors formed at intersections of the gate lines and the data lines; A pixel electrode formed corresponding to each pixel area; An organic insulating layer formed between each of the thin film transistors and the pixel electrode; A contact hole connecting the pixel electrode and the thin film transistor corresponding to each pixel region defined by removing a portion of the organic insulating layer; The plurality of first columns formed on the second substrate by overlapping a portion of the contact hole with one contact hole and overlapping a predetermined portion with the periphery of the corresponding contact hole, and overlapping different portions with respect to the adjacent contact hole. Spacers; And And a liquid crystal layer filled between the first substrate and the second substrate. The method of claim 1, The sum of the contact areas of the periphery of the contact holes, which are adjacent to each other adjacent first column spacers among the column spacers formed on the same line, is smaller than the area of the lower surface corresponding to the first substrate of the first column spacer. Liquid crystal display. The method of claim 1, And a plurality of second column spacers formed on the second substrate to be spaced apart from the organic insulating layer. The method of claim 3, wherein The second column spacer is formed to correspond to the gate line. The method of claim 3, wherein And a recessed portion, the thickness of which is partially removed, in the organic insulating layer corresponding to the second column spacer. The method of claim 1, And a plurality of first column spacers having the same size. The method of claim 1, The column spacers corresponding to four adjacent up, down, left, and right contact holes among the plurality of contact holes may be formed to correspond to the periphery of the lower part, the upper part, the right part, and the left part of each corresponding contact hole. Liquid crystal display. The method of claim 1, And each of the column spacers has one of circular and polygonal shapes of a corresponding surface with respect to the second substrate. The method of claim 1, And the contact holes are formed in any one of a circle and a polygon when viewed from the surface of the organic insulating layer. The method of claim 1, The thin film transistor is A gate electrode protruding from the gate line; A source electrode protruding from the data line; A drain electrode spaced apart from the source electrode and formed on the same layer as the source electrode; And And a semiconductor layer formed to partially overlap the source electrode / drain electrode on the gate electrode. The method of claim 1, And a color filter array formed on the second substrate. The method of claim 11, The color filter array comprises a black matrix layer and a color filter layer. The method of claim 12, And an overcoat layer in the color filter array. The method of claim 1, And a common electrode alternate with the pixel electrode in the pixel area on the first substrate. Preparing a first substrate and a second substrate facing each other; Forming a plurality of gate lines and data lines on the first substrate to define a plurality of pixel regions crossing each other; Forming a plurality of thin film transistors formed at intersections of the gate lines and the data lines; Forming an organic insulating layer on the first substrate including the plurality of thin film transistors; Forming a contact hole in a portion of the organic insulating layer corresponding to an upper portion of the thin film transistor; Forming a pixel electrode in each pixel area; Each of the plurality of contact holes corresponds to one contact hole, and overlaps a predetermined portion with a peripheral portion of the corresponding contact hole, and overlaps a different portion with respect to an adjacent contact hole, thereby forming a plurality of first column spacers on the second substrate. Forming; And And forming a liquid crystal layer filled between the first substrate and the second substrate. The method of claim 15, In the forming of the first column spacer, And a plurality of second column spacers spaced apart from the organic insulating layer on the second substrate. The method of claim 15, And forming the second column spacer corresponding to the gate line. The method of claim 17, And forming a recess by removing a portion of the thickness of the organic insulating layer corresponding to the second column spacer at the same time as forming the contact hole of the organic insulating layer. The method of claim 18, The formation of the contact hole and the recessed portion of the organic insulating film using a halftone mask. The method of claim 18, The formation of the contact hole and the recessed portion of the organic insulating film uses a diffraction mask. The method of claim 19 or 20, And the recessed portion corresponds to the transflective portion of the halftone mask or the diffraction mask.

Images