KR100685956B1 - Liquid Crystal Display Device - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of preventing touch light leakage defects even when a bonding abnormality occurs by having a rail-shaped protrusion corresponding to a column spacer, and includes a first substrate and a second substrate facing each other, A column spacer formed on the second substrate, a protrusion formed to be longer in the first direction than the column spacer in correspondence with the column spacer, and a protrusion formed smaller in the second direction and a liquid crystal layer filled between the first and second substrates; Characterized in that comprises a.

Protrusion, Poor Bond, Touch Light Leaking, Column Spacer, Rail

Description

Liquid Crystal Display Device

1 is an exploded perspective view showing a general liquid crystal display device

2 is a plan view showing a conventional liquid crystal display device

3 is a cross-sectional view taken along line II ′ of FIG. 2;

4A and 4B are a plan view and a cross-sectional view showing a state where a touch spot occurs;

5 is a plan view illustrating a liquid crystal display including projections.

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

7 is a schematic plan view showing the degree of correspondence of the projections and the column spacers in the normal correspondence in FIG.

8A and 8B are schematic plan views showing the degree of correspondence when projections and column spacers correspond to abnormalities in FIG.

9 is a plan view showing a lower substrate of the liquid crystal display of the present invention.

10 is a plan view showing the degree of correspondence between the lower substrate and the column spacer of the liquid crystal display of the present invention;

11A and 11B are plan views illustrating a correspondence degree between a lower substrate and a left or right shifted column spacer of the liquid crystal display of the present invention.

12 is a cross-sectional view taken along line IV-IV 'of FIG.

FIG. 13 is a cross-sectional view taken along the line VV ′ of FIG. 10.

14 is a plan view illustrating a lower substrate and a column spacer corresponding thereto in the liquid crystal display according to the second exemplary embodiment of the present invention.

15 is a plan view illustrating a liquid crystal display according to a third exemplary embodiment of the present invention.

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

70 lower substrate 72 gate insulating film

73: protective film 74: gate line

74a: gate electrode 75: data line

75a / 75b: source / drain electrode 76: pixel electrode

77 semiconductor layer 80 column spacer

81: projection 90: upper substrate

91: black matrix 92: color filter layer

93: common electrode 100: protrusion

101: column spacer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. In particular, the present invention relates to a liquid crystal display device having a rail-shaped protrusion corresponding to a column spacer so as to prevent touch light leakage defects even when a bonding abnormality occurs.

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.

Hereinafter, a liquid crystal display according to the related art will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a general liquid crystal display.

A general liquid crystal display device, as shown in FIG. 1, is injected between a first substrate 1 and a second substrate 2 bonded to each other with a predetermined space, and between the first substrate 1 and the second substrate 2. It consists of the liquid crystal layer 3. In this case, all of the first and second substrates 2 and the liquid crystal layer 3 are referred to as a liquid crystal panel.

In more detail, the first substrate 1 may have a plurality of gate lines 4 in one direction and constant in a direction perpendicular to the gate lines 4 at regular intervals to define the pixel region P. FIG. A plurality of data lines 5 are arranged at intervals. In addition, a pixel electrode 6 is formed in each pixel region P, and a thin film transistor T is formed at a portion where each of the gate lines 4 and the data lines 5 intersect with each other to form the thin film transistor T. ) Applies a data signal of the data line 5 to each of the pixel electrodes 6 according to a signal applied to the gate line 4.

In addition, a black matrix layer 7 is formed on the second substrate 2 to block light in portions other than the pixel region P, and portions R corresponding to the respective pixel regions are formed to express colors. , G, B color filter layers 8 are formed, and a common electrode 9 for realizing an image is formed on the color filter layers 8.

In the liquid crystal display as described above, the liquid crystal layer 3 formed between the first and second substrates 1 and 2 is oriented by an electric field formed between the pixel electrode 6 and the common electrode 9, The amount of light passing through the liquid crystal layer 3 may be adjusted according to the degree of alignment of the liquid crystal layer 3 to express an image.

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 an in-plane switching (IPS) mode to overcome the disadvantage of the TN mode. Liquid crystal display devices have been developed.

In the IPS mode liquid crystal display, a pixel electrode and a common electrode are formed in the pixel area of the first substrate in parallel with each other at a predetermined distance on the same 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.

A general method of manufacturing a liquid crystal display device such as a TN mode or an IPS mode may be classified into a liquid crystal injection method and a liquid crystal drop method according to a method of forming a liquid crystal layer between the first and second substrates.

Here, the liquid crystal injection process will be briefly described as follows.

First, the container containing the liquid crystal material to be injected and the liquid crystal panel to inject the liquid crystal are placed in the chamber, and the pressure in the chamber is maintained in a vacuum state to remove moisture from the liquid crystal material or the inner wall of the container. Then, bubbles are de-included and the inner space of the liquid crystal panel is vacuumed.

The liquid crystal injection hole of the liquid crystal panel is immersed in or contacted with a container containing a liquid crystal material in a desired vacuum state, and then the pressure inside the chamber is changed from a vacuum state to an atmospheric pressure state, and the pressure inside the liquid crystal panel and the pressure of the chamber. By the difference, the liquid crystal material is injected into the liquid crystal panel through the liquid crystal injection hole.

There existed the following problems in the liquid crystal display device manufacturing method of such a liquid crystal injection system.

First, after cutting into a unit panel, the liquid crystal injection hole is immersed in the liquid crystal liquid by maintaining the vacuum state between the two substrates, so that the liquid crystal injection takes a lot of time, the productivity is reduced.

Second, in the case of manufacturing a large-area liquid crystal display device, when the liquid crystal is injected by the liquid crystal injection method, the liquid crystal is not completely injected into the panel, which causes a defect.

Third, since the process is complicated and time-consuming as described above, several liquid crystal injection equipment is required, which requires a lot of space.

Fourth, in the case of the ball spacer used in the liquid crystal display of the injection method, since the individual ball spacers are aggregated together and the sparkling galaxy defects are generated in a scattered state or are arranged in a scattered state, there is a problem of causing light leakage by rolling in the pixel. .

Accordingly, in order to overcome the problems of the liquid crystal injection method, a method of manufacturing a liquid crystal drop type liquid crystal display device in which a liquid crystal is dropped on one of two substrates and then the two substrates are bonded to each other has been developed.

A liquid crystal display device manufacturing method of such a liquid crystal dropping method is a method of dropping an appropriate amount of liquid crystal onto one of two substrates and then joining the two substrates together before bonding the two substrates.

Therefore, when a ball spacer is used to maintain a cell gap like a liquid crystal injection method, when the dropped liquid crystal spreads, the ball spacer is moved in the liquid crystal spreading direction so that the spacer is driven to one side, so that accurate cell gap maintenance is impossible. Done.

Therefore, the liquid crystal dropping method should use a fixed spacer (column spacer or patterned spacer) in which the spacer is fixed to the substrate without using the ball spacer.

The fixed spacers form a black matrix layer, a color filter layer, and a common electrode on the color filter substrate in an array process (an array fabrication process for each of the TFT substrate 1 and the color filter substrate 2), and a photosensitive resin on the common electrode. And selectively remove to form column spacers on the black matrix layer.

At this time, the column spacer is formed by being fixed to the color filter substrate and is in contact with the TFT substrate. The contact portion of the TFT substrate is formed by giving a predetermined height on the color filter substrate, corresponding to any single wiring of the gate line or the data line.

Hereinafter, a liquid crystal display including a conventional column spacer will be described.

FIG. 2 is a plan view illustrating a conventional liquid crystal display, and FIG. 3 is a structural cross-sectional view taken along line II ′ of FIG. 2.

2 and 3, the conventional liquid crystal display device includes a first substrate 1 and a second substrate 2 bonded to each other with a predetermined space, and the first substrate 1 and the second substrate 2. It consists of the liquid crystal layer (not shown) injected in between. In this case, all of the first and second substrates 2 and the liquid crystal layer (not shown) are referred to as a liquid crystal panel. The conventional liquid crystal display device has the same structure except for the general liquid crystal display device of FIG. 1 and the presence or absence of a column spacer. In a typical liquid crystal display, a ball spacer (not shown in FIG. 1) instead of the column spacer functions to support the first and second substrates 1 and 2.

More specifically, in the array area on the first substrate 1 of the conventional liquid crystal display device, the gate line 4 and the data line 5 are arranged perpendicularly to each other so as to define the pixel area. A thin film transistor TFT is formed at a portion where each gate line 4 and the data line 5 cross each other, and a pixel electrode 6 is formed in each pixel area.

The thin film transistor corresponds to a gate electrode 4a protruding from the gate line 4, a semiconductor layer 17 having a shape covering the gate electrode 4a, and both sides of the semiconductor layer 17. A source electrode 5a protruding from the data line 5 and a drain electrode 5b spaced apart from the source electrode 5a by a predetermined interval are included.

The gate line 4 is formed on the first substrate 1 to insulate the metal lines, and a gate insulating film 15 is formed on the entire surface of the substrate including the gate line 4. A protective film 16 is formed on (15).

On the second substrate 2 facing the first substrate 1, a black matrix layer 7 for covering non-pixel regions (gate lines, data lines, and thin film transistor regions) other than the pixel region, and The second substrate including the color filter layer 8 and the color filter layer 8 formed on the second substrate 2 including the black matrix layer 7 in correspondence with the R, G, and B pigments in order for each pixel region ( 2) The common electrode 14 formed on the front surface is formed. In addition, a plurality of column spacers 20 for maintaining a cell gap are formed in a predetermined portion above the common electrode 14.

Here, the column spacer 20 is formed to correspond to the upper portion of the gate line 4.

The plurality of formed column spacers 20 are equally spaced apart from each other, and after bonding, serve as a support function between the first and second substrates 1 and 2.

On the other hand, in the above-described liquid crystal display including the column spacer, a defect occurs in which light leakage occurs when touched as follows.

Hereinafter, touch unevenness (touch failure) will be described.

4A and 4B are a plan view and a sectional view showing a state where a touch spot occurs.

As shown in FIG. 4A, when the surface of the liquid crystal panel 10 is swung in a predetermined direction while being touched with a finger or a pen, the second substrate 2 of the liquid crystal panel 10 may have a finger as shown in FIG. 4B. The predetermined interval is shifted in the passing direction.

At this time, the columnar columnar spacer 20 is in contact with the first and second substrates 1 and 2, and the contact area is large, and the column spacer 20 and the opposing substrate (the first substrate, 1) are in contact with each other. Since the generated frictional force is large, after shifting in the touch direction, the second substrate 2 has not been restored to its original state for a long time. In this case, the liquid crystals of the spot where the finger or the pen passed by are scattered, and a phenomenon in which the liquid crystal collects in the peripheral region of the passed spot occurs. In this case, the area where the liquid crystals 3 are collected has a higher cell gap h1 than the cell gap h2 of the other area defined by the height of the column spacer 20, and the place where the finger or the pen passes is where the liquid crystal is. Scattered, touch defects in which touch portions are observed as mura due to excessive and insufficient liquid crystal occur in the touch region and the touch peripheral region.

The reason why such a touch defect is observed in the liquid crystal display device in which the column spacer is formed is that the column spacer is fixed to one substrate and is in planar contact with the opposing substrate, so that the area of contact with the substrate is larger than that of the spherical ball spacer. Judging by

On the other hand, as described above, the cause of the touch spots, in addition to the viewpoint of the large contact area, there is a view that the vacuum is caught between the contact surface of the substrate and the column spacer when the substrate is touched. The ball spacer has a spherical shape, has a contact portion between the opposing substrate and the contact point, and can move freely in all directions, so that a vacuum state is not formed between the upper and lower substrates even under the condition of touching the liquid crystal panel surface. On the contrary, when the column spacer encounters a flat counter substrate and the upper surface of the column spacer, a vacuum state is easily formed at the contact portion thereof.

As such, whether the contact area between the column spacer and the counter substrate is large or because a vacuum is formed between the column spacer and the counter substrate, the touch failure is a problem mainly observed in the liquid crystal display device in which the column spacer is formed. .

The conventional liquid crystal display as described above has the following problems.

In the conventional liquid crystal display including the column spacer, when the panel surface of the liquid crystal is pushed and touched in a predetermined direction, it takes a long time even if the substrates shifted in opposite directions are not restored or restored to the original state. The liquid crystal that is pushed out of the touch area for a time does not recover and light leakage occurs in this area. The failure due to such a touch is understood to be due to the frictional force of the column spacer and the opposing substrate due to the large contact area between the column spacer and the opposing substrate.

The present invention has been made to solve the above problems to provide a liquid crystal display device that can prevent the touch light leakage failure even if the bonding abnormality occurs by having a rail-shaped projection corresponding to the column spacer, the object There is this.

According to an aspect of the present invention, a liquid crystal display device includes a first substrate and a second substrate facing each other, a column spacer formed on the second substrate, and a column spacer formed on the second substrate. It is characterized in that it comprises a liquid crystal layer filled between the first and the second substrate and the projection formed small in the second direction, small in the second direction.

The length of the protrusion in the first direction is larger than the bonding margin at the bonding between the first and second substrates.

The first direction is a direction in which bonding failure occurs when the first and second substrates are bonded to each other.

The length of the protrusion in the first direction is three times the critical dimension of the lower end surface of the column spacer, and the length in the second direction is 10 μm or less.

The gate substrate may further include a gate line and a data line vertically crossing each other on the first substrate.

The protrusion is formed on the gate line in the same direction as the gate line.

The protrusion is formed on the data line in the same direction as the data line.

The apparatus further includes a common line on the first substrate.

The protrusion is formed on the common line in the same direction as the common line.

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

Efforts to reduce friction by forming protrusions on the counter substrate corresponding to the column spacer in order to reduce the touch defect due to the frictional force according to the contact area between the column spacer and the counter substrate in the conventional liquid crystal display including the column spacer This was raised.

Hereinafter, a liquid crystal display including such protrusions will be described.

FIG. 5 is a plan view illustrating a liquid crystal display including protrusions, and FIG. 6 is a cross-sectional view taken along line III-III ′ of FIG. 5.

As shown in FIGS. 5 and 6, the liquid crystal display including the projections may have a liquid crystal (not shown) between the first and second substrates 40 and 60 and the first and second substrates 40 and 60 that are largely opposed to each other. It is made, including.

More specifically, on the first substrate 40 of the liquid crystal display including the projections, the gate lines 44 and the data lines 45 are vertically intersected with each other to define pixel regions, and the respective gates are arranged. The thin film transistor is formed at the intersection of the line 44 and the data line 45, and the pixel electrode 46 is formed in each pixel area.

The thin film transistor may correspond to the gate electrode 44a protruding from the gate line 44, the semiconductor layer 47 having a shape covering the gate electrode 44a, and both sides of the semiconductor layer 47. A source electrode 45a protruding from the data line 45 and a drain electrode 45b spaced apart from the source electrode 45a by a predetermined interval are included. In addition, a protrusion 51 is formed on the same region and the same metal as the data line 45 at a predetermined portion above the gate line 44. The protrusion 51 may be formed as a single layer of the data line, or may be a double layer including a semiconductor layer below. Whether the plurality of layers of the protrusion 51 is a factor may change depending on the number of masks and a process method.

The protrusion 51 is formed at a position corresponding to the column spacer 50 formed on the second substrate 60, which is due to the step with the other portion of the protrusion 51. This is to reduce the contact area with. When the protrusions 51 and the column spacers 50 correspond to each other, the upper cross-sectional area of the protrusions 51 is relatively smaller than the lower cross-sectional area of the column spacers 50.

Meanwhile, the gate line 44 is formed on the first substrate 40 to insulate the metal lines, and a gate insulating film 42 is formed on the entire surface of the substrate including the gate line 44. A protective film 43 is formed on the 42. In this case, the protrusion 51 may insulate between the gate line 44 and the data line 45 through a gate insulating layer under the protrusion 51.

The second substrate 60, facing the first substrate 40, includes a black matrix layer 61 for covering non-pixel regions (gate lines, data lines, and thin film transistor regions) except for the pixel regions. A color filter layer 62 in which R, G, and B pigments correspond to each pixel area in turn and a common electrode 63 formed on the entire surface of the second substrate 60 including the color filter layer 62 are formed. In addition, a plurality of column spacers 50 for maintaining a cell gap are formed in a predetermined portion above the common electrode 63.

Here, the column spacer 50 is formed at a portion corresponding to the protrusion 51.

The plurality of formed column spacers 50 are equally spaced apart from each other, and after bonding, serve as a support function between the first and second substrates 40 and 60.

The protrusions 51 may be formed to correspond to the column spacers 50 to reduce the contact area between the column spacers 50 and the first substrate 40, and thus may cause the first and second substrates to be touched. When a bonding abnormality occurs in which 40 and 60 are shifted in different directions, it can be easily restored to its original state.

However, even in a liquid crystal display device having a projection structure, when the rod is pushed hard in one direction or a bonding failure occurs in the process, the column spacer may not correspond to the projection. In this case, since the lower end face of the column spacer directly corresponds to the first substrate, the contact area becomes the same level as that of the conventional column spacer, and thus it is impossible to prevent touch failure due to a decrease in contact area during touch.

FIG. 7 is a schematic plan view of FIG. 5 showing the degree of correspondence between the projections and the column spacers in the normal correspondence.

As illustrated in FIG. 7, the liquid crystal display device having the protrusion structure corresponds to the center of the column spacer 50 to arrange the protrusions 51.

However, the actual array process (thin film transistor array forming process and color filter array forming process) of the first and second substrates 40 and 60 is performed separately on each substrate, and then the first and second substrates 40 and 60 are processed. In the process method of adhering the metal, the protrusions 51 and the column spacers 50 are formed on different substrates, so that the protrusions 51 and the column spacers 50 are formed on different substrates. When the first and second substrates 40 and 60 are shifted in different directions, the protrusions 51 and the column spacers 50 may not correspond properly.

8A and 8B are schematic plan views showing the degree of correspondence when the projection and the column spacer correspond to the abnormality in FIG. 5.

FIG. 8A illustrates a case in which the protrusion 51 is formed by partially extending the column spacer 50, and FIG. 8B illustrates a case in which the protrusion 51 is formed outside the column spacer 50. Although it is shown that when the projection 51 is biased with respect to the column spacer 50 in the one direction, there is a possibility that the poor adhesion in the left, right, up and down.

If the first and second substrates 40 and 60 are normally bonded to each other without defects in the projection structure, the touch light leakage may be solved due to a reduction in the desired contact area. Since 50 directly touches the first substrate 40, the contact area is increased again, so that light leakage defects due to touch cannot be avoided.

The liquid crystal display of the present invention described below has a structure that can prevent a touch failure even in the case of bonding failure, and will be described with reference to the drawings.

9 is a plan view illustrating a lower substrate of the liquid crystal display of the present invention, and FIG. 10 is a plan view illustrating a degree of correspondence between the lower substrate and the column spacer of the liquid crystal display of the present invention.

As shown in FIG. 9, protrusions 81 having an elongated shape in the gate line direction are formed on the lower substrate of the liquid crystal display of the present invention.

As shown in FIG. 10, the protrusions 81 are longer in the transverse direction than the column spacers 80 and have a smaller width in the vertical direction, so that the upper area of the protrusions 81 and the column spacers 80 are substantially smaller than those of the column spacers 80. The contact surface of the lower area is not larger than the contact surface of the projection 51 and the column spacer 50 in the liquid crystal display device having the projection structure described above.

For example, the left and right lengths of the protrusions 81 may be about three times the diameter (CD) of the lower surface of the column spacer 80, and the vertical length of the protrusions 81 may be 10 μm or less. In this case, it is assumed that the lower surface of the column spacer 80 is larger than the upper area of the protrusion 81.

The size of the protrusion 81 depends on the size of the column spacer 80, but the protrusion 81 is disposed in one pixel area so that the protrusion 81 is formed at the intersection of the gate line and the data line. Make sure that the step is in a uniform position without passing through it. In this case, the left and right lengths of the protrusions 81 may be changed depending on the degree of shift when the liquid crystal panel is touched. In addition, the left and right lengths of the protrusions 81 may be larger than the bonding margin required for bonding the upper and lower substrates 70 and 90.

In this case, the protrusion 81 serves as a kind of rail, and even though a failure in bonding between upper and lower substrates (see 70 and 90 in FIGS. 12 and 13) occurs, the protrusion 81 is removed from the column spacer 80. It is possible to prevent the touch failure that may occur after the bonding, without being pushed, to correspond. In other words, even when a failure occurs in bonding, the corresponding areas of the protrusions 81 and the column spacers 80 are the same as in normal bonding, so that the restoration can be easily performed at the time of touch due to a decrease in contact area.

11A and 11B are plan views illustrating a degree of correspondence between a lower substrate and a left or right shifted column spacer of the liquid crystal display of the present invention.

FIG. 11A illustrates a case in which the upper substrate 90 is shifted to the left side compared to the lower substrate 70 so that the column spacer 80 is biased to the left side relative to the center of the protrusion 81. 90 shows a case where the column spacer 80 is shifted to the right side relative to the center of the protrusion 81 because the 90 is shifted to the right side relative to the lower substrate 70. In this way, even if a shift occurs between the upper and lower substrates 70 and 90 due to poor bonding, the corresponding areas of the protrusions 81 and the column spacers 80 are the same.

Hereinafter, the bonding structure of the liquid crystal display device of this invention is demonstrated with reference to sectional drawing.

12 is a cross-sectional view taken along the line IV-IV 'of FIG. 10, and FIG. 13 is a cross-sectional view taken along the line V-V' of FIG. 10.

12 and 13, the liquid crystal display of the present invention includes a liquid crystal (not shown) between the first upper substrate 90, the lower substrate 70, and the upper and lower substrates 70 and 90 that largely oppose each other. Is done.

More specifically, on the lower substrate 70 of the liquid crystal display including the projections, the gate lines 74 and the data lines 75 are arranged perpendicularly to each other to define pixel regions, and the gate lines A thin film transistor is formed at a portion where the 74 and the data line 75 cross each other, and a pixel electrode 76 is formed in each pixel area.

The thin film transistor corresponds to a gate electrode 74a protruding from the gate line 74, a semiconductor layer 77 having a shape covering the gate electrode 74a, and both sides of the semiconductor layer 77. A source electrode 75a protruding from the data line 75 and a drain electrode 75b spaced apart from the source electrode 75a by a predetermined interval are included. In addition, the protrusion 81 is formed on the same layer and the same metal as the data line 75 at a predetermined portion above the gate line 74. The protrusion 81 may be formed as a single layer of the data line, or may be a double layer including a semiconductor layer below. Whether the plurality of protrusions 81 is formed is an element that can be changed depending on the number of masks and a process method.

The protrusions 71 are formed at positions corresponding to the column spacers 80 formed on the upper substrate 90, which are different from those of the column spacers 80 due to the difference between the other portions of the protrusions 71. This is to reduce the contact area. When the protrusions 71 and the column spacers 80 correspond to each other, the upper cross-sectional area of the protrusions 71 is relatively smaller than the lower cross-sectional area of the column spacers 80.

The gate line 74 is formed on the lower substrate 70 to insulate the metal lines, and a gate insulating layer 72 is formed on the entire surface of the substrate including the gate line 44. On the 72, a protective film 73 is formed. The protrusion 81 may insulate the gate line 74 and the data line 75 through the gate insulating layer 72 at a lower portion thereof.

The upper substrate 90 has a black matrix layer 91 for covering non-pixel regions (gate lines, data lines, and thin film transistor regions) except for the pixel regions, and the pixel regions facing the lower substrate 70. Each color R, G, and B pigments are sequentially formed to form a color filter layer 92 and a common electrode 93 formed on the entire surface of the upper substrate 90 including the color filter layer 92. In addition, a plurality of column spacers 80 for maintaining a cell gap are formed in a predetermined portion above the common electrode 93.

Here, the column spacer 80 is formed at a portion corresponding to the protrusion 81.

The plurality of formed column spacers 80 are spaced apart from each other by equal intervals, and after bonding, the column spacers 80 support the upper and lower substrates 70 and 90.

The protrusion 81 is formed to correspond to the column spacer 80 to reduce the contact area between the column spacer 80 and the lower substrate 70 so that the upper and lower substrates 70 and 90 are touched. When a bonding abnormality shifted in different directions occurs, the original state can be easily recovered.

Here, as shown in the lower cross section of the column spacer 80, it may be circular, it may be modified in various forms, such as a polygon including a square.

14 is a plan view illustrating a lower substrate and a column spacer corresponding thereto in the liquid crystal display according to the second exemplary embodiment of the present invention.

As shown in FIG. 14, in the liquid crystal display according to the second exemplary embodiment of the present invention, the protrusion 100 is formed on the data line in the data line direction, and the column spacer 101 is correspondingly formed. The same structure as the liquid crystal display device of the present invention has the same effect. Therefore, description is abbreviate | omitted about the structure similar to the structure demonstrated by the liquid crystal display device of this invention.

In this case, the protrusion 100 is formed in the same layer on the same layer as the gate line 74 in the gate line patterning process, and thus, the protrusion 100 is a portion having a relatively high step compared to other portions of the data line. In addition, a gate insulating film (see 72 of FIGS. 12 and 13) is formed between the protrusion 100 and the data line 75 in order to avoid conduction between the protrusion 100 of the gate line 74 component and the data line 75. This intervenes.

The liquid crystal display according to the second exemplary embodiment of the present invention has a structure corresponding to the vertical shift of the upper and lower substrates 70 and 90.

In some cases, as shown in FIG. 10, the protrusions may be elongated in the left and right directions, and as shown in FIG. 14, two protrusions may be formed in the vertical direction. In this case, the column spacer should correspond to both the long projection in the left and right directions and the long projection in the vertical direction.

In addition, although the liquid crystal display according to the first and second embodiments described above are all illustrated in the TN mode, the transverse electric field mode may also be applied in the same manner.

15 is a plan view illustrating a liquid crystal display according to a third exemplary embodiment of the present invention.

As shown in FIG. 15, the liquid crystal display according to the third exemplary embodiment is applied to an in-plane switching mode (IPS mode) in which the pixel electrode 76 and the common electrode 78a are alternately formed. Since the line 78 is further formed on the lower substrate (TFT array substrate), a portion where the protrusion 110 may be formed may further include a common line 78 in addition to the gate line 74 and the data line 75. Could be. Similarly, the column spacer 111 formed to correspond to the protrusion 110 may be formed on the gate line 74 and the data line 75 or the common line 78. As such, the protrusion 110 may be formed. The reason why the column spacer 111 is formed on the wiring is to prevent a decrease in the aperture ratio.

The liquid crystal display of the present invention extends the embodiment by forming a long projection in a direction in which a shift failure can occur, and forming a column spacer in correspondence to the projection, thereby preventing a touch failure even when a bonding failure occurs. You will get the effect.

The liquid crystal display of the present invention as described above has the following effects.

The column spacer has a projection structure in order to reduce the area corresponding to the first substrate (TFT array substrate) and is formed on the wiring in the direction in which the bonding failure occurs. You can make contact.

Therefore, even if the surface of the liquid crystal panel is touched in one direction due to the reduced contact area, the frictional force is less than that of the structure having the general column spacer, so that it is easy to restore the original bonded state, and the liquid crystal is not restored to the original state due to the touch. To prevent light leakage.

In addition, protrusions and column spacers may be formed on wiring lines such as gate lines, data lines, or common lines to prevent aperture ratio loss due to the formation of the protrusions and column spacers.

Claims (14)

A first substrate and a second substrate facing each other; A column spacer formed on the second substrate; A protrusion corresponding to the column spacer, the protrusion being formed longer in the first direction than the corresponding surface of the column spacer, and shorter in the second direction and having a rectangular corresponding surface; And And a liquid crystal layer filled between the first and second substrates. The method of claim 1, A length in the first direction of the protrusion is larger than a bonding margin at the time of bonding between the first and second substrates. The method of claim 1, And the first direction is a direction in which bonding failure occurs when the first and second substrates are bonded to each other. The method of claim 1, The length of the first direction of the projections is three times the width of the first direction of the corresponding surface of the column spacer, the length of the second direction of the projections is greater than 0㎛ 10㎛ or less . The method of claim 1, And a gate line and a data line vertically intersecting each other on the first substrate. The method of claim 5, And the protrusion is formed on the gate line in the same direction as the gate line. The method of claim 5, And wherein the protrusion corresponds to a portion of the data line so that the first direction is formed in the same direction as the data line. The method of claim 5, And a common line on the first substrate. The method of claim 8, And the protrusion is formed on the common line in the same direction as the common line. The method of claim 6, And wherein the protrusion is formed of a metal having the same layer as the data line on the gate insulating layer through a gate insulating layer on the gate line. The method of claim 6, And wherein the protrusion is formed by stacking a metal pattern on the same layer as the data line and a semiconductor layer under the metal pattern on the gate insulating layer, through a gate insulating layer on the gate line. The method of claim 7, wherein And wherein the projection is formed of a metal having the same layer as the gate line under the gate insulating layer through a gate insulating layer under the data line. The method of claim 9, And wherein the protrusion is formed of a metal having the same layer as the data line on the gate insulating layer through a gate insulating layer on the common line. The method of claim 9, And wherein the protrusion is formed by stacking a metal pattern on the same layer as the data line and a semiconductor layer under the metal pattern on the gate insulating layer through a gate insulating layer on the common line.

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