KR101239820B1 - LCD and method of fabricating of the same - Google Patents

Abstract

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 having an improved strength of an edge region with respect to external pressure, and a method of manufacturing the same.

According to the present invention, a gap spacer for maintaining a gap of a liquid crystal panel and a pressing spacer for preventing a liquid crystal panel from being pressed due to external pressure are configured. Each pixel corresponds to a center of the panel. Each of the gap spacers is configured for every six pixels in the edge region of the liquid crystal panel, and each of the pressing spacers is configured for every three pixels or two pixels.

As described above, by relatively compactly configuring the pressing spacer in the edge region of the liquid crystal panel, the panel strength against external pressure applied to the edge region is improved in the process of manufacturing or moving the liquid crystal panel. Staining can be prevented.

Description

LCD and its manufacturing method {LCD and method of fabricating of the same}

1 is an exploded perspective view schematically illustrating a configuration of a general liquid crystal display device;

2 is a cross-sectional view schematically illustrating a configuration of a liquid crystal display device having a dual column spacer;

3 is a view schematically showing a layout of a gap column spacer and a pressed column spacer according to the related art;

4 is a schematic plan view of a liquid crystal panel for displaying a region to which external pressure is applied;

5 is a view schematically showing the arrangement of a gap column spacer and a pressed column spacer, according to the present invention;

6 is an enlarged plan view of a part of an array substrate for a liquid crystal display device configured with a dual column spacer;

7A to 7E are cross-sectional views illustrating a manufacturing process of an array substrate for a liquid crystal display device according to the present invention, according to a process sequence;

8A to 8C are cross-sectional views illustrating a manufacturing process of a color filter substrate for a liquid crystal display device according to the present invention, in accordance with a process sequence.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

300a: gap spacer 300b: pressed spacer

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device, and more particularly, to a high quality liquid crystal display device and a method of manufacturing the same, in which paint spots do not occur in an edge area.

In general, a liquid crystal display device is a display device that displays an image by using optical anisotropy and birefringence characteristics of a liquid crystal filled between two bonded substrates.

Hereinafter, a general configuration of a liquid crystal display device will be described with reference to FIG. 1.

1 is a view schematically showing a liquid crystal display according to the related art.

As shown in the drawing, a general color liquid crystal display 11 includes a color filter 7 including a black matrix 6 formed between a sub color filter 8 and each sub color filter 8, and the color filter ( The color filter substrate 5 having the common electrode 18 deposited thereon and the pixel region P are defined, and the pixel electrode 17 and the switching element T are formed in the pixel region. The liquid crystal 14 is filled between the array substrate 22 in which array wiring is formed around (P), and the color filter substrate 5 and the array substrate 22.

In the array substrate 22, a thin film transistor T, which is a switching element, is positioned in a matrix type, and a gate line 13 and a data line 15 passing through the plurality of thin film transistors T are formed. do.

In this case, the pixel area P is an area defined by the gate line 13 and the data line 15 crossing each other, and a transparent pixel electrode 17 is formed on the pixel area P as described above.

The pixel electrode 17 uses a transparent conductive metal having a relatively high transmittance of light, such as indium-tin-oxide (ITO).

The liquid crystal panel is completed by bonding the color filter substrate 5 and the array substrate 22 configured as described above with the liquid crystal layer 14 interposed therebetween, and the liquid crystal layer is formed of the color filter substrate 5. Positioned between the array substrates 22 and the surface is initially arranged by the rubbed alignment film.

In the above-described configuration, when a voltage is applied between the pixel electrode 17 and the common electrode 18, an electric field is generated in the longitudinal direction, and the liquid crystal molecules 14 are moved by the electric field, thereby changing the electric field. The image can be expressed by the light transmittance.

Although not shown in the above-described configuration, a spacer is formed between the array substrate 22 and the color filter substrate 5 to maintain a gap between the two substrates.

In the liquid crystal panel configured as described above, light leakage occurs when external pressure such as pressing is applied from the outside.

Such light leakage is caused by the occurrence of slippage between the array substrate and the color filter substrate due to external pressure, which causes bending of the liquid crystal panel.

That is, the rubbing directions of the array substrate and the color filter substrate are not parallel to each other in the bending direction of the liquid crystal panel. As a result, the liquid crystals adjacent to the substrate surface are arranged in parallel in the bending direction, so that the whole arrangement is different from the initial state.

In such a case, the arrangement of the liquid crystals does not maintain the initial black state, and the light passing through the liquid crystal layer rotates while undergoing a retardation different from that of the normal portion, resulting in light leakage.

Therefore, a dual column spacer structure has been introduced as a method for solving such defects.

That is, in the case of forming columnar column spacers, a so-called dual structure including a gap column spacer which serves to maintain a gap between the array substrate and the color filter substrate, and a pressed column spacer for preventing light leakage due to external force. A configuration for forming a column column (Dual Column Spacer) has been proposed.

This will be described below with reference to FIG. 2.

2 is an enlarged cross-sectional view illustrating a configuration of a liquid crystal display according to the related art.

As shown, the liquid crystal display (LCD) is composed of an array substrate (B1) and a color filter substrate (B2).

The array substrate B1 includes a thin film transistor T and array wirings 13 and 15 connected to the transparent insulating substrate 22.

In detail, the pixel region P including the switching region S and the storage region (not shown) are formed on the transparent first substrate 22, and the gate electrode 32 is formed in the switching region S. FIG. And a thin film transistor T including an active layer 34, a source electrode 36, and a drain electrode 38, and a transparent pixel electrode 17 in contact with the drain electrode is positioned in the pixel region P. .

On one side and the other side of the pixel region P, a gate line 13 in contact with the gate electrode 32 of the thin film transistor T and a data line 15 in contact with the source electrode 36 are provided. Located.

The color filter substrate is spaced apart from the array substrate B1 configured as described above, and the color filter substrate B2 includes a transparent second insulating substrate 5, color filters, and black matrices 7a and 7b. do.

In detail, the thin film transistor T and the data line may be disposed on an opposite surface of the transparent second substrate 5 spaced apart from the transparent first substrate 22 and the liquid crystal layer (not shown). The black matrix 6 is formed corresponding to the gate wirings 13 and 15, and the color filters 7a and 7b are formed on the surface corresponding to the pixel region P. As shown in FIG.

The color filter sequentially uses red, green, and blue color filters 7a, 7b (not shown), and sequentially configures corresponding to each pixel P, or applies the same color filter to the pixels P adjacent to each other in the vertical direction. It may also be configured in a stripe shape (constituent stripe type).

A transparent common electrode 18 is formed on the entire surface of the substrate 22 including the color filters 7a and 7b and the black matrix 6.

Particularly, the column spacers 20a and 20b having a dual structure are formed under the black matrix and the color filters 6 and 7a and 7b.

At this time, the gap column spacer 20a of the dual column spacers 20a and 20b has a function of maintaining a gap between the two substrates 5 and 22, and the pressed column spacer 20b is a substrate ( 22) and a predetermined gap G1.

In this way, the gap column spacer 20a functions to maintain a gap between the array substrate B1 and the color filter substrate B2, while the pressed column spacer 20b is formed by an external pressure. When pressed, it serves to withstand the load, thereby minimizing the distortion of the liquid crystal, thereby preventing the stain.

At this time, the distribution form of the gap column spacer 20a and the pressed column spacer 20b will be described below with reference to the drawings.

3 is a plan view illustrating a layout example of a conventional dual structure column spacer.

As illustrated, a plurality of pixels P are defined on the substrate 5, and color filters R, G, and B are disposed corresponding to the pixels P. FIG.

In this case, the red, green, and blue color filters R, G, and B are formed in a stripe shape such that the same color filter is formed in the pixels P adjacent to each other in the vertical direction, and is pressed by the plurality of pixels P. Column spacer 20b and the gap column spacer 20a are arrange | positioned uniformly.

In detail, the gap column spacer 20a and the pressed column spacer 20b are alternately configured for every three pixels in the horizontal direction, and the gap column spacer 20a and the pressed spacer are formed for every unit pixel in the vertical direction. Make sure 20b is configured alternately.

Accordingly, the gap column spacer 20a and the depressed column spacer 20b have a form configured for every six pixels in the horizontal direction.

As described above, the gap column spacer 20a and the pressed column spacer 20b are evenly distributed, thereby preventing the flow of liquid crystals, and in particular, when applied from the outside to act as a resistance component against such external forces to prevent staining. To make it possible.

However, in spite of the above-described configuration, the coating stain occurred in the peripheral area of the liquid crystal panel, that is, the edge portion.

This will be described below with reference to FIG. 4.

4 is a schematic plan view of a liquid crystal panel for displaying a region to which external pressure is applied.

As shown in the drawing, a portion where a human hand directly touches and applies pressure in a process of manufacturing the liquid crystal display device 50 or in a moving process is a peripheral area (B area) rather than a center area (A area).

That is, as the pressure is partially applied to the peripheral area (region B) of the panel, bending of the spacer occurs in this part, and thus, there is a problem of uneven coating due to light leakage as mentioned above.

The present invention has been proposed to solve the above-mentioned problem, and by more densely configuring the pressing spacer in the edge region of the liquid crystal panel, to maintain a sufficient repulsive force against the pressure applied from the outside, so as to prevent paint stains For the purpose of

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a first substrate and a second substrate including a plurality of pixel areas, the center area and a peripheral area; A liquid crystal layer positioned between the first substrate and the second substrate; A liquid crystal display comprising a gap column spacer configured to hold a gap between the first and second substrates and a depressed column spacer acting on an external pressure, the liquid crystal display device comprising: a gap column spacer corresponding to the center region; The pressed column spacers are configured to be equally pushed, the gap column spacers are configured to be the same as the center region corresponding to the peripheral region, and the pressed column spacers are configured to have a higher density than the gap column spacers.

For the center region, the gap column spacer and the depressed column spacer are not positioned in the same pixel, and each of the gap column spacers is configured as one for every six pixels.

The pressed column spacers configured in the peripheral region may be arranged in a 1/3 structure including one for every three pixels or a half structure for each one for every two pixels.

The gap column spacer and the pressed column spacer may be disposed together in the same pixel to correspond to the peripheral area.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising: preparing a first substrate and a second substrate; Defining the first substrate and the second substrate as a central region and a peripheral region including a plurality of pixel regions; Forming gate lines and data lines formed on one surface of the first substrate and positioned to cross one side and the other side of the pixel; Forming a thin film transistor positioned at an intersection point of the gate line and the data line; Forming a transparent pixel electrode on the pixel; Forming a black matrix opening for each pixel on one surface of the second substrate; Forming a color filter for each pixel; In forming a gap column spacer and a pressed column spacer below the color filter, the gap column spacer and the gap column spacer are disposed at the same density corresponding to the center region, and the peripheral region is disposed so that the density of the pressed column spacer is larger. Forming a pressed column spacer.

In this case, the gap column spacer and the pressed column spacer may not be located in the same pixel, but may be configured for every six pixels.

The pressed column spacers configured in the peripheral region are arranged in a 1/3 structure composed of one for every three pixels or a half structure composed of one for every two pixels.

The gap column spacer and the pressed column spacer may be disposed together in the same pixel to correspond to the peripheral area.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Example

A feature of the present invention is characterized in that the pressing spacer is more densely constituted.

FIG. 5 is a diagram illustrating an arrangement example of a gap column spacer and a pressed column spacer according to a central portion and a peripheral portion of the liquid crystal panel according to the present invention.

As shown in the drawing, the center region of the liquid crystal panel sequentially configures a gap column spacer 300a and a pressed column spacer 300b in the horizontal direction, one for every three pixels as described above, and the cap for each unit pixel in the vertical direction. The column spacer 300a and the pressed column spacer 300b are sequentially configured.

Therefore, in the central area of the liquid crystal panel, the gap column spacer 300a and the depressed column spacer 300b are formed in six horizontal pixels.

On the other hand, in the peripheral region of the liquid crystal panel, the gap column spacer 300a is configured to be positioned every six pixels in the horizontal direction as in the center region, but the pressed column spacer 300b has three pixels as shown. It is configured to be located every, or in order to be more dense, it is characterized in that it is configured to be located every two pixels.

In this case, since the density of the pressed column spacer 300b formed in the peripheral region is two to three times that of the liquid crystal panel, the density becomes very dense, and the repulsive strength against pressure applied from the outside becomes very large. There is an advantage that can prevent the painting stain caused by the pressure.

FIG. 6 is an enlarged plan view schematically showing an enlarged portion of an array substrate for a liquid crystal display device according to the present invention. (The column spacer formed on the color filter substrate is also displayed.)

As illustrated, a plurality of pixels P are defined on the substrate 100, the gate wiring 102 is formed on one side of the pixel P, and data is provided on the other side of the pixel P that crosses the pixel P. The wiring 116 is configured.

The pixel P forms a transparent pixel electrode 122.

At the intersection of the gate line 102 and the data line 116, the gate electrode 104, the active layer 108 on the gate electrode 104, and the source and drain electrodes on the active layer 108 ( A thin film transistor T including 112 and 114 is formed.

In this case, the gate electrode 104 is in contact with the gate wiring 102, the source electrode 112 is in contact with the data wiring 116, and the drain electrode 114 is in contact with the pixel electrode 122. Configure to contact.

Color filters R, G, and B are configured to correspond to the pixels P of the array substrate 100 configured as described above, and a gap column spacer is disposed below the color filters R, G, and B. 300a and the pressed column spacer 300b is configured.

In this case, the pressed column spacer 300b is positioned to correspond to the gate wiring 102 of the array substrate 100, and the gap column spacer 300a corresponds to the thin film transistor T of the array substrate 100. According to the resolution, the gap column spacer 300a and the pressed column spacer 300b may be located in a single pixel P, or may be dividedly positioned between neighboring pixels P as shown in the drawing. have.

In the central region of the liquid crystal panel, the gap column spacer 300a and the depressed column spacer 300b are not located at the same pixel. However, this structure occurs because the density of the depressed column spacer 300b is increased in the edge region of the liquid crystal panel. Done.

Hereinafter, a method of manufacturing an array substrate for a liquid crystal display device according to the present invention will be described with reference to the process drawings.

7A to 7E are cross-sectional views taken along the line IV-IV of FIG. 6 and showing the process steps of the present invention.

As shown in FIG. 7A, the switching region S and the pixel P are defined on the substrate 100, and the gate electrode 104 and the gate electrode 104 are in contact with the switching region S. FIG. While forming the gate wiring 102 extending to one side of the pixel (P).

In this case, the gate wiring 102 and the gate electrode 104 are electrically conductive including aluminum (Al), aluminum alloy (AlNd), chromium (Cr), tungsten (W), molybdenum (Mo), titanium (Ti), and the like. One or more selected metal groups are deposited and patterned to form them.

Next, an inorganic insulating material such as silicon oxide (SiO ₂ ), silicon nitride (SiN _X ), or the like in some cases, benzocyclobutene on the entire surface of the substrate 100 on which the gate wiring 102 and the gate electrode 104 are formed. An organic insulating material such as (BCB) and an acrylic resin is deposited to form a gate insulating film 106.

As shown in FIG. 7B, pure amorphous silicon (a-Si: H) and impurity amorphous silicon (n + a-Si: H) are deposited and patterned on the entire surface of the substrate 100 on which the gate insulating layer 106 is formed. The active layer 108 and the ohmic contact layer 110 are formed on the gate insulating layer 106 corresponding to the gate electrode 104.

As illustrated in FIG. 7C, the aforementioned conductive metal is deposited and patterned on the entire surface of the substrate 100 on which the ohmic contact layer 110 is formed, and thus, a source electrode spaced apart from the top of the ohmic contact layer 110. 112, a drain electrode 114, and a data line 116 intersecting with the gate line 102 while being in contact with the source electrode 112 are formed.

As shown in FIG. 7D, an inorganic insulating material including silicon nitride (SiN _X ) and silicon oxide (SiO ₂ ) is formed on the entire surface of the substrate 100 on which the source and drain electrodes 112 and 114 and the data line 116 are formed. In some cases, a protective film 118 is formed by depositing an organic insulating material such as benzocyclobutene (BCB) and an acrylic resin.

Next, the passivation layer 118 is patterned to form a drain contact hole 120 exposing a part of the drain electrode 114.

As shown in FIG. 7E, one selected from the group of transparent conductive metals including indium tin oxide (ITO) and indium zinc oxide (IZO) is formed on the entire surface of the substrate 100 on which the passivation layer 118 is formed. By depositing and patterning, the pixel electrode 122 positioned in the pixel region P is formed while contacting the drain electrode 114.

An array substrate according to the present invention can be manufactured by the above-described process, and a manufacturing process of the color filter substrate bonded to the array substrate will be described below with reference to the process drawings.

8A to 8C are cross-sectional views illustrating a method of manufacturing a color filter substrate according to the present invention, in accordance with a process sequence.

As shown in FIG. 8A, a plurality of pixels P are defined on the substrate 200, and chromium (Cr) and chromium oxide (CrOx) and The same opaque material is deposited and patterned to form a black matrix 202 having an opening corresponding to the pixel P.

Next, color filters 204a, 204b (not shown) representing red, green, and blue are formed for each pixel.

As shown in FIG. 8B, the planarization film 205 is formed by coating one of the aforementioned organic insulating material groups on the entire surface of the substrate 200 on which the black matrix and the color filters 202, 204a, and 204b are formed. .

Next, a common electrode 206 is formed by depositing one selected from a group of transparent conductive metals including indium tin oxide (ITO) and indium zinc oxide on the planarization layer.

As shown in FIG. 8C, a polymer resin or a photosensitive polymer resin is coated and patterned on the entire surface of the substrate 200 on which the common electrode 206 is formed, and the gap between the two substrates is contacted between the two substrates. The gap column spacer 300a to hold | maintain, and the pressed column spacer 300b which act as a resistance component by external force are formed.

In this case, the gap column spacer 300a and the depressed column spacer 300b correspond to the center region of the liquid crystal panel and have a structure in which one pixel is positioned for each six pixels, and the gap column spacer corresponds to the edge region of the liquid crystal panel. Is located every six pixels, but the pressed column spacer is configured one for every three or two pixels.

As described above, a liquid crystal display device including a column spacer having a dual structure according to the present invention can be manufactured.

Therefore, since the liquid crystal display device of the dual structure according to the present invention is configured to further densify the density of the pressed column spacer in the peripheral region of the liquid crystal panel, it can act as a sufficient repulsive force to the pressure applied during the manufacturing process or movement of the liquid crystal panel, There is an effect that it is possible to prevent the paint stains in the peripheral area of the liquid crystal panel.

Therefore, it is possible to minimize the defect of the liquid crystal panel has the effect of improving the production yield.

Claims (8)

A first substrate and a second substrate composed of a plurality of pixel regions and defined by a central region and a peripheral region; A liquid crystal layer positioned between the first substrate and the second substrate; A liquid crystal display device comprising a gap column spacer configured to hold a gap between the first and second substrates and a depressed column spacer acting on an external pressure. The gap column spacer and the pressed column spacer have the same density corresponding to the center region, And the gap column spacer is configured to correspond to the peripheral region in the same manner as the center region, and the pressed column spacer is configured to have a higher density than the gap column spacer. The method of claim 1, And wherein the gap column spacer and the pressed column spacer are not positioned in the same pixel, but one for every six pixels with respect to the center region. The method of claim 2, And the pressed column spacers arranged in the peripheral area are arranged in a 1/3 structure consisting of one for every three pixels, or in a 1/2 structure consisting of one for every two pixels. The method of claim 3, wherein And the gap column spacer and the pressed column spacer are arranged together in the same pixel to correspond to the peripheral area. Preparing a first substrate and a second substrate; Defining the first substrate and the second substrate as a central region and a peripheral region including a plurality of pixels; Forming gate lines and data lines formed on one surface of the first substrate and positioned to cross one side and the other side of the pixel; Forming a thin film transistor positioned at an intersection point of the gate line and the data line; Forming a transparent pixel electrode on the pixel; Forming a black matrix opening for each pixel on one surface of the second substrate; Forming a color filter for each pixel; In forming a gap column spacer and a pressed column spacer below the color filter, the gap column spacer and the gap column spacer are disposed at the same density corresponding to the center region, and the peripheral region is disposed so that the density of the pressed column spacer is larger. Forming a pressed column spacer Liquid crystal display device manufacturing method comprising a. 6. The method of claim 5, Wherein the gap column spacer and the pressed column spacer are not located in the same pixel and are configured for every six pixels with respect to the central region. 6. The method of claim 5, And the pressed column spacers arranged in the peripheral region are arranged in a 1/3 structure consisting of one for every three pixels or a half structure consisting of one for every two pixels. The method of claim 7, wherein And the gap column spacer and the pressed column spacer are arranged together in the same pixel to correspond to the peripheral region.

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