KR101264682B1 - 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 for manufacturing the same, which can prevent touch and gravity failure even when a misalignment occurs during bonding, etc. And a first column spacer and a second column spacer formed at a predetermined portion on the second substrate, projections formed on the first substrate corresponding to the first column spacer, and corresponding to an outer periphery of the second column spacer. And a liquid crystal layer filled between the compensation pattern formed on the first substrate and the first and second substrates.

Column spacer, bad touch, misalignment, adhesion, poor gravity, bad press, paint stain

Description

[0001] The present invention relates to a liquid crystal display device and a method of 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 having a protrusion structure.

4A and 4B are cross-sectional views illustrating projections and misalignment of column spacers in a liquid crystal display having a dual column spacer structure including protrusions, and misalignment.

5A to 5D are cross-sectional views showing projections and compensation patterns of the liquid crystal display of the present invention and corresponding degrees of first and second column spacers, respectively.

6A to 6D are plan views illustrating the correspondence degree of the second column spacer and the compensation pattern of the liquid crystal display of the present invention in various embodiments.

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

FIG. 8 is a structural cross-sectional view taken along lines II ′ and II ′ II ′ of FIG. 7;

Description of the Related Art [0002]

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

110: projection 120, 130, 140: compensation pattern

200: second substrate 201: black matrix layer

202: color filter layer 203: overcoat layer

210: first column spacer 220: 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 for manufacturing the same, which can prevent touch and gravity failure even when misalignment occurs during bonding.

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied, and some of them have already been 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 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. 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 to correspond 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.

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 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 and gravity failure even if a misalignment occurs, such as when bonding.

The liquid crystal display device of the present invention for achieving the above object is a first substrate and a second substrate facing each other, a first column spacer and a second column spacer formed in a predetermined portion on the second substrate, and the first A projection formed on the first substrate corresponding to the column spacer, a compensation pattern formed on the first substrate corresponding to the periphery of the second column spacer, and a liquid crystal layer filled between the first and second substrates. There is a characteristic in that it is done.

Here, the compensation pattern is spaced apart from the corresponding surface of the first substrate of the second column spacer by a predetermined distance.

The protrusions correspond to the centers of the first column spacers.

On the first substrate, a gate line and a data line crossing each other to define a pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel electrode formed in the pixel region are formed.

The common electrode is further formed in the pixel area in an alternate shape with the pixel electrode.

Further, on the second substrate, a black matrix layer formed corresponding to a portion other than the pixel region and a color filter layer formed corresponding to a portion including at least the pixel region are further formed. In addition, an overcoat layer may be formed on the entire surface of the second substrate, or a common electrode may be further formed on the entire surface of the second substrate.

The thin film transistor may include a gate electrode protruding from the gate line, a source electrode and a drain electrode spaced apart from each other on the gate electrode, and a portion of the thin film transistor in contact with the source electrode and the drain electrode to be partially contacted with each other. It comprises a semiconductor layer formed between the layers. In this case, the protrusion and the compensation pattern are formed of the same material at the same height. For example, the protrusion and the compensation pattern may be formed of a semiconductor layer pattern of the same layer as the semiconductor layer at the bottom, and a stack of source / drain electrode layers of the same layer as the source / drain electrode at the top.

The compensation pattern may be spaced apart from the first substrate corresponding surface of the second column spacer to have a closed loop shape, or the compensation pattern may be spaced apart from the first substrate corresponding surface of the second column spacer at equal intervals. It may be made of a compensation pattern. In this case, the plurality of compensation patterns may be disposed on the left and right sides with respect to the center of the second column spacer, or disposed on the top and bottom with respect to the center of the second column spacer or based on the center of the second column spacer. It may be arranged up, down, left and right. The gap between the linear compensation patterns passing through the center of the second column spacer among the plurality of compensation patterns corresponds to a critical dimension of the first substrate corresponding surface of the second column spacer to the second substrate of the second column spacer. The critical dimension of the face.

In addition, the liquid crystal display of the present invention for achieving the same object, the first substrate and the second substrate facing each other, the first column spacer and the second column spacer formed in a predetermined portion on the second substrate, and the first A projection designed on the first substrate corresponding to the center of the column spacer, a compensation pattern designed on the first substrate corresponding to the periphery of the second column spacer, and a liquid crystal layer filled between the first and second substrates. There is another feature in that it consists of.

In the misalignment between the first and second substrates, the first column spacer and the protrusion do not overlap each other, and a predetermined portion of the second column spacer and the compensation pattern overlaps each other.

The bonding margin between the first and second substrates is' the critical dimension of the first substrate corresponding surface of the second column spacer + the critical dimension of the linear compensation pattern interval passing through the center of the second column spacer) / 2 + the upper part of the protrusion. Is less than the critical dimension of the plane.

In addition, the manufacturing method of the liquid crystal display of the present invention comprises the steps of preparing a first, a second substrate, forming projections and compensation patterns spaced apart from each other on the first substrate, and on the second substrate Forming first column spacers corresponding to the protrusions, forming second column spacers corresponding to the compensation patterns, and forming a liquid crystal layer between the first and second substrates. Has its features.

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

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

As shown in FIG. 3, the liquid crystal display including the protrusion structure includes a first substrate 60 and a second substrate 70 that face each other, a protrusion 85 formed on the first substrate 60, and the protrusion ( The liquid crystal layer (not shown) filled between the column spacer 80 formed on the second substrate 70 and the first and second substrates 60 and 70 corresponding to 85 is formed. Here, the protrusion 85 is formed to have a relatively small volume and a corresponding surface as compared with the column spacer 80.

As such, when the protrusions 85 are included at positions corresponding to the column spacers 80, the surfaces of the first and second substrates 60 and 70 may be touched (rubbing or sweeping in one direction). When the first substrate 60 or the second substrate 70 is shifted with respect 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. Named based on the second substrate 70 on which the column spacer is formed, in this case, the upper side of the protrusion 85 that is relatively smaller than the surface corresponding to the column spacer on the surface of the second substrate 70 is referred to as the lower surface. As the area is reduced, frictional force between the column spacer 80 and the first substrate 60, which is the opposite substrate, is reduced due to the reduction of the friction area. Therefore, when the first substrate 60 or the second substrate 70 is pushed with respect to the opposing substrate in one direction by the touch, restoration to the original state is easy again. Therefore, touch failure can be prevented.

In the structure including the protrusions 85, when the first and second substrates 60 and 70 are bonded to each other, a change in the shape of the column spacer 80 corresponding to the protrusions 85 will be described. In the spacer 80, the force is concentrated only at a portion corresponding to the protrusion 85, and thus the column spacer 80 is pressed by a predetermined thickness. As such, when the column spacer 80 is pressed, the column spacer 80 is not spaced apart from the first substrate 60 during the thermal expansion of the liquid crystal when the liquid crystal panel has a high temperature environment by the pressed thickness. Do not. Therefore, in the projection structure, the thermal expansion degree of the liquid crystal is larger than the thermal expansion degree of the column spacer in a high temperature environment, and the liquid crystal flows into the gap spaced apart from the column spacer by the opposing substrate so that the lower end bulges and looks bulging. Gravity defects may be prevented by the thickness of the column spacer 80 pressed by the protrusion 85. Here, the thickness of the column spacer 80 pressed by the protrusion 85 is referred to as gravity margin.

In the liquid crystal display including the protrusion structure, the force applied to the column spacer 80 by the protrusion 85 when the predetermined pressure is applied to the outside is so great that even if the predetermined pressure is removed, the column spacer 80 is removed. ) Further comprises a column spacer having an anti-press function, which can come into contact with the opposing substrate only at a predetermined pressure in order to prevent paint stains caused by not returning to the original shape. As such, the structure in which the first column spacer is formed corresponding to the protrusion and the second column spacer spaced apart from the counter substrate is called the dual column spacer structure.

4A and 4B are cross-sectional views showing projections and misalignment of column spacers in a liquid crystal display having a dual column spacer structure including protrusions.

As shown in FIG. 4A, a dual column spacer structure including protrusions includes a first substrate 60 facing each other, a second substrate 70, a protrusion 85 formed at a predetermined portion on the first substrate 60, and The first column spacer 80 formed at a portion on the second substrate 70 corresponding to the protrusion 85 on the first substrate 60, and the first substrate 60 so as to be spaced apart from the first substrate 60 by a predetermined interval. It includes a second column spacer 90 formed on the second substrate 70 and a liquid crystal layer (not shown) filled between the first and second substrates 60 and 70.

The protrusion 85 may be formed by stacking a semiconductor layer pattern 85a and a source / drain metal layer 85b. In general, the source / drain metal layer 85b is formed to have a smaller area than the semiconductor layer pattern 85a.

In addition, the first and second column spacers 80 and 90 are formed at the same height, and thus, the second column spacer 90 is formed to correspond to a portion where there is no step such as a protrusion 85. Therefore, the first substrate 60 is spaced apart by a distance corresponding to the height of the protrusion 85.

The above-described structure shows a state in which the first and second substrates 60 and 70 are normally aligned and bonded together. In the following, a misalignment occurs when the first and second substrates 60 and 70 are bonded together. The case where the shift state between the first and second substrates 60 and 70 is not maintained after the touch is generated or is not restored to the original state after the touch will be described.

As shown in FIG. 4B, when the shift between the first and second substrates 60 and 70 occurs, the degree of shift of the first column spacer 80 with respect to the protrusion 85 depends on the degree of shift between the substrates. That is, when the second substrate 70 is shifted by a to the left relative to the first substrate 60, the protrusions 85 are positioned to the right side of the first column spacer 80. In this case, the protrusion 85 and the first column spacer 80 do not come into contact with each other, and thus, it is difficult to maintain a cell gap. Accordingly, the first and second column spacers 80 and 85 are generally disposed. In order to contact the first substrate 60, a phenomenon in which a cell gap is reduced may occur. In this case, when the first and second column spacers 80 and 85 come into contact with the first substrate 60, touch defects may be caused by reducing friction surfaces by matching the column spacers with protrusions with a small area when the bonding occurs. Prevention will not be available. That is, when the first substrate 60 and the second substrate 70 are shifted by a misalignment during bonding, the corresponding surface where the column spacers 80 and 90 contact each other is the upper surface of the column spacers (in this case, When the second substrate 70 is viewed as a reference plane, the second substrate 70 corresponding surfaces of the first and second column spacers 80 and 90 are assumed to be lower surfaces, and are contacted with a large area when they are bonded. Since the first and second column spacers 80 and 90 are in contact with the first substrate 60, it is difficult to obtain a touch failure prevention effect.

Also, when the second substrate 70 is shifted by b to the right relative to the first substrate 60, the protrusions 85 are positioned on the left side of the first column spacer 80. In this case, the protrusion 85 and the first column spacer 80 do not come into contact with each other, which may cause the same problem as described above.

Hereinafter, the liquid crystal display of the present invention having a column spacer and an opposing substrate contact area having the same or similar degree as in normal bonding even if a shift between the first and second substrates occurs during bonding.

5A to 5D are cross-sectional views illustrating projections and compensation patterns of the liquid crystal display of the present invention and corresponding degrees of first and second column spacers, respectively.

As shown in FIG. 5A, the liquid crystal display of the present invention includes a first substrate 100, a second substrate 200, a protrusion 110 formed at a predetermined portion on the first substrate 100, and The second column spacer 210 is formed on the second substrate 200 to correspond to the protrusion 110 on the first substrate 100, and the second substrate is spaced apart from the first substrate 100 by a predetermined distance. The second column spacer 220 formed on the substrate 200, the first and second compensation patterns 120 and 130 formed on the outer periphery of the second column spacer 220, and the first and second substrates ( It includes a liquid crystal layer (not shown) filled between the 100, 200.

The protrusion 110 may be formed by stacking the semiconductor layer pattern 110a and the source / drain metal layer 110b. The source / drain metal layer 110b is formed with a smaller area than the semiconductor layer pattern 110a.

The first and second column spacers 210 and 220 are formed at the same height, and thus, the second column spacer 220 is positioned to correspond to a portion where there is no step, such as the protrusion 110, in the design. In addition, when the first and second substrates 100 and 200 are normally bonded, as shown in FIG. 5A, the first and second substrates 100 and 200 are spaced apart by a distance corresponding to the height of the first substrate 100 and the protrusion 110.

Here, the first and second compensation patterns 120 and 130 formed around the second column spacer 220 are similar to the protrusions 110, and the semiconductor layer patterns 120a and 130a and the source / drain, respectively. The metal layers 120b and 130b are stacked. Therefore, the protrusion 110 and the first and second compensation patterns 120 and 130 have the same height.

Here, the source / drain metal layers 120b and 130b, which are upper layers of the first and second compensation patterns 120 and 130, may be in contact with the second column spacer 220 when misaligned. The critical dimension of the source / drain metal layers 120b and 130b is referred to as 'Y'.

Further, in the liquid crystal display of the present invention, the first and second column spacers (such as the same or similar in contact or correspondence between the structure of the column spacers and the opposing substrate during normal bonding and misalignment bonding) The values between the heights 100 and 200 and the critical dimension (CD) of each of the lower surface (the second substrate corresponding surface) and the upper surface (the first substrate corresponding surface) are the same, and the protrusions 110 and The critical dimensions of the upper surfaces of the first and second compensation patterns 120 and 130 are also set to the same value. In this case, the critical dimensions of the lower and upper surfaces of the first and second column spacers 100 and 200 are referred to as 'L' and 'X', respectively. Here, the critical dimension X of the upper surface of the column spacers corresponds to a value (about (0.95 * L) / 2) of about 1/2 of the critical dimension L of the lower surface of the column spacers.

The structure of FIG. 5A illustrates when the first and second substrates 100 and 200 are normally bonded, and after the first and second substrates 100 and 200 are bonded, the first column among the column spacers. Only the spacer 210 is in contact with the upper area of the protrusion 110. In this case, the second column spacer 220 is a corresponding height of the protrusion 110 and is spaced apart from the first substrate 100 with a gap between the first and second compensation patterns 120 and 130. It is.

Here, the spacing D between the first compensation pattern 120 and the second compensation pattern 130, in particular, the spacing D between the source / drain metal layers 120b and 130b, which is the upper layer of each compensation pattern, may be at least the first compensation pattern 120. The value is larger than the critical dimension X of the first substrate corresponding surface of the two-column spacer 220. In this case, as shown in FIG. 5A, only the protrusion 110 corresponds to the first column spacer 210, and the first and second compensation patterns 120 and 130 correspond to the second column spacer 220. In order to minimize the contact area between the column spacers and the opposing substrate by maintaining the spaced apart from each other. In addition, the maximum distance between the first and second compensation patterns 120 and 130 may be set so that the second column spacer 220 is first or second before the first column spacer 210 is separated from the protrusion 110. 2 is determined in a relationship of contacting the compensation patterns 120 and 130. The maximum distance between the first and second compensation patterns 120 and 130 will be described in more detail below.

The structure described above shows a state in which the first and second substrates 100 and 200 are normally aligned and bonded together in the liquid crystal display device of the present invention. Hereinafter, in the structure of the liquid crystal display device of the present invention, The case where misalignment occurs when the first and second substrates 100 and 200 are bonded to each other will be described.

5B to 5D illustrate an example in which the second substrate 200 shifts to the right relative to the first substrate 100.

When the degree of shift of the second substrate 200 with respect to the first substrate 100 is less than (DX) / 2 shown in FIG. 5B, only the first column spacer 210 corresponds to the protrusion 110. You will come across.

In addition, when the second substrate 200 is shifted to the right by more than (DX) / 2 with respect to the first substrate 100, the second column spacer 220 is the second compensation pattern 130. It comes in contact with. That is, when the shift degree is increased and the second column spacer 220 moves to the one side of the center between the compensation patterns beyond (DX) / 2, the second compensation pattern 130 and the second column spacer 220 are moved. ) And the second compensation pattern 130 functions as a protrusion with respect to the second column spacer 220. In view of this value, the time point at which the second column spacer 220 is in contact with the compensation pattern is a distance between the critical dimension X of the second column spacer and the compensation pattern located on the line in the shift direction (D). It can be seen that it depends.

5C, when the second substrate 200 is shifted to the right by more than (X + Y) / 2 with respect to the first substrate 100, the first column spacer 210 is protruded. There is no contact from 110. In view of this value, determining the time point at which the first column spacer 210 and the protrusion 110 do not meet is determined by the upper surface critical dimension X of the first column spacer 210 and the protrusion 110. It can be seen that it is controlled according to the upper surface threshold dimension (Y).

Here, when the shift between the first and second substrates 100 and 200 occurs by (X + Y) / 2 or more, the first column spacer 210 and the protrusion 110 do not correspond to each other. One of the compensation patterns 120 and 130 should function as a protrusion in contact with the second column spacer 220. That is, the minimum shift degree (DX) / 2 when the second compensation pattern 130 is in contact with the second column spacer 220 may be such that the protrusion 110 is spaced apart from the first column spacer 210. It can be seen that it should be smaller than the maximum shift amount ((X + Y) / 2). That is, it can be seen that (D-X) / 2 <(X + Y) / 2, in this relationship, a relationship of D <2X + Y which is an interval between the compensation patterns is established. That is, when D, the distance between the compensation patterns, is a critical dimension of the lower surface of the second column spacer 220 is L, L is equal to or slightly larger than about 2X, and Y is considerably smaller than X. The distance between the first and second compensation patterns 120 and 130 may be equal to or less than a critical dimension L of the lower surface of the second column spacer 220. Therefore, since the interval D between the first and second compensation patterns 120 and 130 should have at least an interval of X or more and a maximum of L or less, it can be seen that a relationship of X≤D≤L is established. have.

In this relationship, when the degree of shift between the first and second substrates 100 and 200 is (DX) / 2 or more and (X + Y) / 2 or less, the first column spacer 210 corresponds to the protrusion 110. It can be seen that the second column spacer 220 is in contact with the second compensation pattern 130. That is, in the shift range (DX) / 2 or more ≤ shift degree ≤ (X + Y) / 2, the upper surface on which the first and second column spacers 210 and 220 are formed on the first substrate 100. It can be seen that this small structure (protrusions and compensation patterns) is in contact.

Meanwhile, depending on how much the gap D between the first and second compensation patterns 120 and 130 is, the timing of contacting the second column spacer 220 and the second compensation pattern 130 may be changed. have.

For example, when the distance D between the first and second compensation patterns 120 and 130 is shown, when the second column spacer 220 is in contact with the second compensation pattern 130, the second column spacer 220 contacts the second compensation pattern 130. The shift of the viewpoint is X / 2. Accordingly, the first and second column spacers 210 and 220 may have the protrusions 110 and the second, respectively, in the degree of shift in the range of (DX) / 2 (= X / 2) to (X + Y) / 2. It is in contact with the compensation pattern 130.

For example, when the distance D between the first and second compensation patterns 120 and 130 is 3 × / 2, the second column spacer 220 may be connected to the second compensation pattern 130. The first and second column spacers 210 and 220 are respectively protruded in the range of the contact point is X / 4 and (DX) / 2 (= X / 4) to (X + Y) / 2. And a second compensation pattern 130.

In addition, when the distance D between the first and second compensation patterns 120 and 130 is X, the second column spacer 220 may be misaligned. The first and second column spacers 210 and 220 are in contact with the protrusion 110 and the second compensation pattern 130, respectively. As described above, when the distance D between the first and second compensation patterns 120 and 130 is X, since the misalignment is generated except during normal bonding, the first and second column spacers ( 210 and 220 are in contact with the protrusions 110 and the second compensation pattern 130, and the second column spacer (S) is shifted after (X + Y) / 2 to (D + X) / 2 + Y. Only 220 is in contact with the second compensation pattern 130.

As described above, as the distance D between the first and second compensation patterns 120 and 130 is relatively smaller, the second column spacer 220 contacts the compensation pattern 120 or 130. You can see that the timing is faster.

In addition, as shown in FIG. 5D, the shift between the first and second substrates 100 and 200 is (X + D) / 2 + Y even after the first column spacer 210 is removed from the protrusion 110. The second column spacer 220 is in contact with the second compensation pattern 130, so that the second compensation pattern 130 functions as a protrusion with respect to the second column spacer 220. That is, when the shift degree between the first and second substrates 100 and 200 is from (X + Y) / 2 to less than (D + X) / 2 + Y ((X + Y) / 2 <shift degree < It can be seen that only the second column spacer 220 is in contact with the second compensation pattern 130 at (D + X) / 2 + Y).

When the shift occurs, when the second column spacer 220 is out of the second compensation pattern 130, the second substrate 200 is (X + D) / with respect to the first substrate 100. When shifted more than 2 + Y. When shifted by (X + D) / 2 + Y or more, the second compensation pattern 130 completely escapes from the second column spacer 220, and any one of the first and second column spacers 210 and 220 protrudes. The first and second column spacers 210 and 220 do not contact the 110 or the first and second compensation patterns 120 and 130, respectively. As a result, the contact area increases at the time of touch, and the touch failure improvement for the purpose of design cannot be obtained. In some cases, the column spacers and the projections and the compensation pattern are located in the direction in which the shift does not occur due to misalignment in one panel, and the column spacers, the projections and the compensation pattern are located in the shift direction. When the located portions coexist, the cell gap degree is different for each portion, and cell gap defects may be generated for each region according to misalignment.

Meanwhile, the direction of the shift between the first and second substrates 100 and 200 may occur in the right direction, as shown in FIGS. 5B to 5D, and may be left or up and down. For example, when the shift of the second substrate 200 is made in the left direction with respect to the first substrate 100, the first compensation pattern 120 may have the second compensation pattern described above according to each shift degree. 130).

As shown in FIGS. 5A to 5D, when a shift occurs between the first and second substrates 100 and 200 due to misalignment, the range in which the projection or compensation pattern may be used is (X + D) / It can be seen that less than 2 + Y. When the shift between the first and second substrates 100 and 200 due to misalignment occurs, any of the protrusions 110 and the compensation patterns 120 and 130 may be separated from the column spacers 210 and 220. It cannot cope, so that the column spacer cannot contact the opposing substrate with a small contact area. Accordingly, the upper surfaces of the column spacers 210 and 220 are in planar contact with the opposing substrate during bonding, so that the frictional force during the shift between the first and second substrates 100 and 200 due to the touch is large. It is difficult to return to the furnace and the luminance nonuniformity generated at the time of touch remains for a long time.

In the liquid crystal display device of the present invention in which the misalignment at the time of bonding is in the range of less than (X + D) / 2 + Y, the projections 110 and the remaining compensation patterns 120 are formed of the first and second column spacers. Although not in contact with 210 and 220, at least one protrusion 110 or one compensation pattern 120 or 130 is in contact with the first or second column spacers 210 and 220.

As can be seen from this result, the bonding margin between the first and second substrates is' the critical dimension of the first substrate corresponding surface of the second column spacer + the critical dimension between the compensation pattern) / 2 + the critical upper surface of the protrusion. 'Is less than.

In the liquid crystal display of the present invention, even when misalignment occurs, the first column spacer 210 does not correspond to the protrusion 110 and maintains a spaced apart state to have a depression preventing function. The second column spacer 220 is in contact with one of the first compensation pattern 120 or the second compensation pattern 130, and serves to maintain a cell gap, so that the first and second column spacers 220 may be in contact with each other. The functions of the second column spacers 210 and 220 are the same as those in the normal bonding shown in FIG. 5A except that the functions of the second column spacers 210 and 220 are interchanged. That is, the contact area between the column spacers and the opposing substrate is small at the time of normal bonding or misaligned bonding or touch, so that it is easy to recover to the original state, thereby preventing touch failure, and in addition to the protrusion or compensation pattern. As a result, the gravity gap can be prevented according to the degree of the column spacer being pressed, and when the predetermined pressure is applied, the separately formed column spacers correspond to the opposing substrate together to have the prevention of the pressing.

Here, the shift degree of the second substrate 200 with respect to the first substrate 100 will be within the bonding margin range at the time of bonding to the left and right.

Currently manufactured, the bonding margin that may occur when bonding between the first and second substrates 100 and 200 is within 10 μm, for example, the critical dimension (X) of the upper surface of the second column spacer 220. ) Is about 10 to 20 µm. On the other hand, in the column spacer and the corresponding structure in the structure of the liquid crystal display of the present invention, the degree of shift that the protrusion 110 or the first and second compensation patterns 120 and 130 can function is the smallest (D = X and X = 10) will also be 10 µm or more, which is larger than the bonding margin that may occur during manufacture. In practice, this is because, when forming the liquid crystal display, as in the structure of the liquid crystal display (FIG. 5A) of the present invention, since the misalignment may occur below the bonding margin in the process, even if a misalignment occurs, At least one of the first and second column spacers 210 and 220 is in contact with the opposing protrusion or the compensation pattern, thereby serving as a cell gap support function, and the other column spacer has a shape of the column spacer when pressed. It means being able to take on the function of preventing change.

In a structure such as the liquid crystal display device of the present invention, even when a large margin of adhesion can be generated in a large area panel, the degree of shift between the first and second substrates capable of relatively functioning the protrusions and the compensation pattern can function. May be available.

When the first and second compensation patterns 120 and 130 are arranged as described above, the bonding margin may have a value less than or equal to a critical dimension X of the upper surface of the second column spacer 220. For example, even if the first and second compensation patterns 120 and 130 have a minimum separation distance X, at least one compensation pattern corresponds to the second column spacer 220 during misalignment. The compensation pattern and the protrusion may correspond to the first and second column spacers 210 and 220, respectively, or the first column spacer 210 and the protrusion 110 may correspond to each other, thereby causing misalignment. Even if it is, the same effect of maintaining a small contact area is obtained. At this time, the degree of misalignment is low, and with the contact between the first column spacer 210 and the protrusion 110, the second column spacer 220 and the first or second compensation patterns 120 and 130. Even when the contact is made together, since the protrusions 110 and the upper surfaces of the compensation patterns 120 and 130 are small, the first and second column spacers 210 and 220 may directly contact the first substrate 100. In comparison, the corresponding contact area of the first substrate 100 of the column spacers is considerably smaller.

In such a structure, when a shift occurs between the first and second substrates 100 and 200 by a touch, the second column spacer 220 is one of the first and second compensation patterns 120 and 130. Can be in contact with the compensation pattern. In this case, the upper areas of the first and second compensation patterns 120 and 130 are the same as the upper areas of the protrusions 110, and even when touched, the ratio is very small compared to the total column spacer area (the upper area of the protrusions). Since the contact ratio is about twice, the difference in the ratio of the contact area between the column spacers and the opposing substrate is not so large as compared with the case of bonding, so that the friction surface is small and the recovery to the original state is easy.

6A to 6D are plan views illustrating a correspondence degree between a second column spacer and a compensation pattern of the liquid crystal display of the present invention in various embodiments.

In the drawings, the upper surface of the second column spacer 220 and the compensation patterns, that is, the surfaces facing each other, are illustrated. In this case, each of the second column spacer 220 and the compensation pattern is illustrated. The critical dimension may be made larger.

The first and second column spacers 210 and 220, the protrusions 110, and the first and second compensation patterns 120 and 130 may be thin film transistors on a non-display area, that is, the first substrate 100. When the array is formed, and when the color filter array is formed on the second substrate 200, it is formed to correspond to the upper portion of the black matrix layer, and the upper portion of the gate line 101 formed on the first substrate 100. It will be formed in response to.

FIG. 6A illustrates a case in which first and second compensation patterns 120 and 130 are formed on the left and right sides with respect to the center of the second column spacer 220 described above. In this case, the second column spacer 220 The first and the first compensation patterns (120, 130) are formed on the left and right.

6B, a second column spacer 220 is formed on the gate line 101, and the first and second compensation patterns 120a and 130a are disposed above and below the center of the second column spacer 220. It is shown the case formed. The reason why the first and second compensation patterns 120a and 130a are formed on the upper and lower sides of the second column spacer 220 is to consider a case in which misalignment appears on the upper and lower sides.

In the case of FIG. 6C, a second column spacer 220 is formed to correspond to an upper portion of the gate line 101, and the first to fourth compensation patterns are respectively arranged on the top, bottom, left, and right sides of the center of the second column spacer 220. The case where 140a, 140b, 140c, 140d is formed is shown. Here, the second and fourth compensation patterns 140b and 140d formed at left and right sides of the center of the second column spacer 220 may form an outline (the first substrate corresponding surface) of the second column spacer 220. The first and third compensation patterns 140a and 140c which are formed at equal intervals and are spaced apart from each other and formed on the top and bottom of the center of the second column spacer 220 have an outline of the second column spacer 220. The first substrate corresponding surface) is formed at equal intervals. At this time, the degree spaced apart from the left and right and the spaced apart from the left and right with respect to the second column spacer 220 may be the same or different. This is determined by considering the bonding margin.

6D illustrates a structure in which a closed loop compensation pattern 150 is formed around the second column spacer 220 to correspond to a predetermined portion of the upper portion of the gate line 101. In this case, the second column spacer 220 and the compensation pattern 150 are shown to be spaced apart from each other by a predetermined interval, where the second column spacer 220 illustrated corresponds to the first substrate 100. The lower surface of the second column spacer 220 (the area of the second substrate 200 forming surface) may overlap the closed loop compensation pattern 150.

As described in the above embodiments, the second column spacer 220 is formed on the second substrate 200 to correspond to a predetermined portion on the gate line 101 in the design, and the second column spacer 220 The compensation pattern is formed by being spaced apart from the corresponding surface of the first substrate 100 by a predetermined interval. Herein, the shape of the compensation pattern and the separation distance between the second column spacer 220 may be determined in consideration of the bonding margin between the first and second substrates 100 and 200, and the larger the bonding margin, the greater the separation degree. Is increased and spaced at small intervals if the cementation margin is small.

In addition, when the protrusion 110 deviates from the first column spacer 210, an arrangement interval may be determined such that a predetermined portion of the compensation pattern corresponds to the second column spacer 220.

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

FIG. 7 is a plan view illustrating the liquid crystal display of the present invention, and FIG. 8 is a structural cross-sectional view taken along line II ′ and line II ′ of FIG. 7.

As shown in FIG. 7 and FIG. 8, the liquid crystal display of the present invention is filled between the first substrate 100 and the second substrate 200 facing each other, and the first and second substrates 100 and 200. It includes a liquid crystal layer (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, the second storage electrode 104b connected to the common line 104a passing through the pixel region, the first storage electrode 103a formed thereon, and the gate insulating layer 105 and the passivation layer interposed between the two electrodes. 106 constitutes 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).

The first semiconductor layer pattern 110a and the source / drain of the same layer as the semiconductor layer 107a may be formed at predetermined portions of the gate line 101, the common line 104a, and the second storage electrode 104b. The projection 110 in which the first source / drain metal layer 110b of the same layer as the electrode 102a / 102b is laminated, and the second semiconductor layer pattern 141 and the source / drain of the same layer as the semiconductor layer 107a. Compensation patterns 140a, 140b, 140c, and 140d on which the second source / drain metal layers 142 of the same layer as the electrodes 102a and 102b are stacked are formed on the top, bottom, left, and right sides of the second column spacer 220. Here, the materials of the protrusion 110 and the compensation pattern 140 are made the same, and are formed to the same thickness.

On the other hand, on the second substrate 200 facing the first substrate 100, a black matrix layer 201 formed corresponding to a region (gate line and data line region) excluding the pixel region, and the second An overcoat layer 203 for planarization is formed on the color filter layer 202 formed on the substrate 200 and the second substrate 200 including the black matrix layer 201 and the color filter layer 202.

In addition, the first column spacer 210 is designed to correspond to the protrusion 110 having a relatively small corresponding surface, and the second column spacer 220 is designed to be formed in the compensation pattern 140. .

On the other hand, the column spacer 210 may be formed in various shapes such as a horizontal cross-section of a polygon, such as a circle, a square. In consideration of the alignment margin in the process, it may be advantageous to form a circular or regular polygon.

Here, the thicknesses of the first and second semiconductor layer patterns 110a and 141 are about 0.2 to 0.3 μm, and the thicknesses of the first and second source / drain metal layers 110b and 142 are about 0.2 to 0.4 μm. Compared with the portions on the remaining gate line 101 where the protrusions 110 and the compensation pattern 140 are not formed, portions where the protrusions 110 and the compensation pattern 140 are formed have a step of about 0.4 to 0.7 μm. do.

The illustrated compensation pattern 140 includes first to fourth compensation patterns 140 spaced apart from each other by a predetermined interval on the upper side, the right side, the lower side, and the left side of the second column spacer 220. It may be formed in various embodiments formed in the periphery of the column spacer 220. 6A to 6D may be modified in various embodiments.

In the liquid crystal display of the present invention, when the first and second substrates 100 and 200 correspond to each other, the protrusion 110 corresponds to the central portion of the first column spacer 210. The compensation pattern 140 will be formed around the two column spacer 220. In this case, the first column spacer 210 functions to maintain a cell gap between the first and second substrates 100 and 200, and the second column spacer 220 is connected to the first substrate 100. When spaced apart and pressed at a predetermined external pressure, the cell gap holding function is shared with the first column spacer 210 to prevent plastic deformation of the column spacer, thereby preventing a poor pressing (staining stain). In addition, when the liquid crystal expands at a high temperature such that the first column spacer 210 is pressed by the protrusion 110, the first and second substrates 100 and 200 are not spaced apart from each other and are in contact with each other. It is possible to maintain, together with the function of preventing gravity failure.

In addition, even when a misalignment occurs between the first and second substrates 100 and 200 at the time of bonding, the second column spacer 220 may be removed from the first column spacer 210. The second column spacer 220 has a function of maintaining a cell gap by being corresponding to a compensation pattern 140 or a predetermined portion of the compensation pattern on one side, and the first column spacer 210 has a depression prevention function. The function is switched to have. Therefore, if such a structure is adopted, even if the adhesion occurs in the state where the misalignment between the first and second substrates 100 and 200 occurs, it will be possible to simultaneously solve the touch failure, gravity failure and depression failure.

The embodiments described above have 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.

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.

In the liquid crystal display of the present invention, a compensation pattern (s) are designed so that protrusions having a relatively small corresponding area corresponding to the first column spacer correspond to the center thereof, and spaced apart from each other by a predetermined interval corresponding to the second column spacer. By designing the first and second substrates, the protrusions correspond to the central portion of the first column spacer when the first and second substrates normally correspond, and a compensation pattern will be formed around the second column spacer. In this case, the first column spacer functions to maintain a cell gap between the first and second substrates, and the second column spacer is spaced apart from the first substrate so that the first and second substrates are separated by a predetermined external pressure. The cell gap holding function is shared with the first column spacer at the time of pressing to prevent plastic deformation of the column spacer, thereby preventing the pressing failure (painting stain). In addition, when the liquid crystal expands at a high temperature such that the first column spacer is pressed by the protrusion, the first and second substrates 100 and 200 may not be spaced apart from each other and may be in contact with each other, thereby causing poor gravity. It will be provided with a function to prevent the.

On the other hand, a misalignment occurs between the first and second substrates during bonding, so that even if the protrusions deviate from the first column spacers, the misalignment patterns may correspond to a compensation pattern or a predetermined portion of the compensation pattern on one side of the second column spacers. Thus, the function is switched so that the second column spacer has a function of maintaining a cell gap, and the first column spacer has a depression preventing function. Therefore, the first column spacer has a pressing prevention function, and the first column spacer will have a touch gap prevention function and a gravity failure prevention function together with a cell gap holding function.

Therefore, if the same structure as that of the liquid crystal display device of the present invention is adopted, even if the adhesion occurs in the state where the misalignment between the first and second substrates occurs, it will be possible to simultaneously solve the touch failure, gravity failure and depression failure.

Claims (21)

A first substrate and a second substrate facing each other; A first column spacer and a second column spacer formed adjacent to each other on the second substrate; A protrusion formed on the first substrate corresponding to the first column spacer; A compensation pattern formed on the first substrate in a closed loop corresponding to the periphery of the second column spacer; And In the liquid crystal display device comprising a liquid crystal layer filled between the first and second substrates, The protrusions and the compensation pattern are formed of the same material at the same height, and smaller than the first substrate corresponding surface of the first and second column spacers, respectively. The second column spacer has a gap from the first substrate in the compensation pattern on the closed ring, and the distance between the linear compensation patterns passing through the center of the second column spacer is equal to that of the first substrate corresponding surface of the second column spacer. Between a critical dimension and a critical dimension of the second substrate mating surface of the second column spacer, The bonding margin between the first and second substrates is equal to (the critical dimension of the first substrate corresponding surface of the second column spacer + the critical dimension of the gap between the linear compensation patterns passing through the center of the second column spacer) / 2 + Less than the critical dimension of the upper surface of the projections, Normal correspondence between the first and second substrates The protrusion is in contact with the center of the first column spacer, the compensation pattern corresponds to the periphery of the second column spacer, Misalignment between the first and second substrates And the at least a portion of the first column spacer and the protrusion or the second column spacer and the compensation pattern are in contact with each other. delete delete The method of claim 1, On the first substrate A gate line and a data line crossing each other to define a pixel area; A thin film transistor formed at an intersection of the gate line and the data line; And And a pixel electrode formed in the pixel region. 5. The method of claim 4, And a common electrode in the pixel region in an alternating shape with the pixel electrode. 5. The method of claim 4, On the second substrate A black matrix layer formed corresponding to portions other than the pixel region; And And a color filter layer formed corresponding to at least a portion including the pixel area. The method according to claim 6, An overcoat layer is further formed on the entire surface of the second substrate. The method according to claim 6, And a common electrode formed on the entire surface of the second substrate. 5. The method of claim 4, The thin film transistor may include a gate electrode protruding from the gate line; A source electrode and a drain electrode formed on the gate electrode and spaced apart from each other; And And a semiconductor layer formed between the source / drain electrode and the gate electrode in contact with the source electrode and the drain electrode at a predetermined portion. delete The method of claim 1, The projection and the compensation pattern is a liquid crystal display device comprising a semiconductor layer pattern of the same layer and a semiconductor layer on the bottom, and a source / drain electrode and a layer of the source / drain electrode layer of the same layer on the top. delete delete delete delete delete delete delete delete delete Preparing a first and a second substrate; Forming a compensation pattern on the protrusion and the closed ring on the first substrate; Forming corresponding first and second column spacers adjacent to each other on the second substrate, respectively, in the protrusions and the closed rings of the compensation pattern; And In the manufacturing method of the liquid crystal display device which includes forming the liquid crystal layer between the said 1st, 2nd board | substrate, The protrusions and the compensation pattern are formed of the same material at the same height and they are smaller than the first substrate corresponding surface of the first and second column spacers, respectively. Within the closed loop of the compensation pattern, the second column spacer has a gap from the first substrate, and the distance between the linear compensation patterns passing through the center of the second column spacer corresponds to the first substrate of the second column spacer. Between the critical dimension of the surface and the critical dimension of the second substrate corresponding surface of the second column spacer, The bonding margin between the first and second substrates is equal to (the critical dimension of the first substrate corresponding surface of the second column spacer + the critical dimension of the gap between the linear compensation patterns passing through the center of the second column spacer) / 2 + Less than the critical dimension of the upper surface of the projections, Normal correspondence between the first and second substrates The protrusion is in contact with the center of the first column spacer, the compensation pattern corresponds to the periphery of the second column spacer, Misalignment between the first and second substrates And at least a portion of the first column spacer and the protrusion or the second column spacer and the compensation pattern are in contact with each other.

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