KR20040000649A - Liquid Crystal Display device and Method for Manufacturing the same - Google Patents

Abstract

PURPOSE: A liquid crystal display, and a method for manufacturing the same are provided to prevent a sealant from flowing into an active area and prevent an inflow of polluted liquid crystal, thereby preventing stains of liquid crystal. CONSTITUTION: A plurality of pixel areas(105) are defined by a plurality of gate lines(103) and a plurality of data lines(104) formed on a lower substrate(101). The lower substrate includes thin film transistors, pixel electrodes. An upper substrate(102) is opposite to the lower substrate, and includes a color filter for realizing R(Red), G(Green), and B(Blue) colors. Liquid crystal is formed between the lower substrate and the upper substrate. A sealant(107) is formed at an outline of an active area(106) formed of the plurality of pixel areas. A liquid crystal inflow prevention wall(108) is formed between the sealant and the active area to prevent a flow of the liquid crystal.

Description

Liquid crystal display device and method for manufacturing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same, and more particularly, to a liquid crystal display device and a method for manufacturing the same, which can prevent liquid crystal stain defects by forming a liquid crystal inflow preventing barrier between the active region and the sealant.

Recently, due to the rapid development of the information and communication field, the importance of the display industry for displaying desired information is increasing day by day, and to date, CRT (cathod ray tube) among information display devices can display various colors and display brightness It has also enjoyed steady popularity so far because of its superiority.

However, there is an urgent need for the development of flat panel displays instead of CRTs that are bulky and bulky due to the desire for large, portable and high resolution displays. These flat panel displays have a wide range of applications from computer monitors to displays used in aircraft and spacecraft.

Currently produced or developed flat panel displays include liquid crystal display (LCD), electro luminescent display (ELD), field emission display (FED), plasma display panel (PDP), etc. In order to achieve an ideal flat panel display, light weight, high brightness, high efficiency, high resolution, high speed response characteristics, low driving voltage, low power consumption, low cost, and color display characteristics are required. Among such flat panel displays, the liquid crystal display device is in the spotlight because of its durability as well as its desire.

On the other hand, the liquid crystal display device is an image display device using the optical anisotropy characteristics of the liquid crystal, and when the light is irradiated to the liquid crystal exhibiting polarization characteristics according to the voltage applied state of the liquid crystal display device according to the alignment state of the liquid crystal It is a device that can express the image by adjusting the amount.

In order to configure the liquid crystal display device, a liquid crystal panel including the liquid crystal layer and a circuit disposed around the liquid crystal panel to apply a signal to the liquid crystal panel and control the signal are further required.

Hereinafter, a general transmissive liquid crystal display device will be described with reference to the accompanying drawings.

1 is a schematic perspective view of a general liquid crystal display device.

As shown in FIG. 1, the liquid crystal display device includes a liquid crystal panel 10 including an upper substrate 11, a lower substrate 12, and a liquid crystal layer 13 formed between the two substrates to express colors, and The first and second polarizing plates 14 and 15 are disposed above and below the liquid crystal panel 10 to be perpendicular to each other.

Although not shown, the liquid crystal panel 10 further includes a backlight, which is a light source, and a light guide plate, a reflecting plate, a diffusion plate, and a prism for transmitting light emitted from the backlight.

Here, the first and second polarizing plates 14 and 15 have a characteristic in which the polarization direction is vertical.

The lower substrate 12 may also be referred to as an array substrate, and a thin film transistor (not shown), which is a switching element, and a pixel electrode (not shown) for displaying an image are located in a matrix type. In order to operate the thin film transistor, the gate line 16 and the data line 17 are formed to be orthogonal to each other.

The upper substrate 11 is also referred to as a color filter substrate. The upper substrate 11 corresponds to a black matrix for preventing light leakage to the gate line 16, the data line 17, and the thin film transistor, and the pixel electrode, and corresponds to R (red). A color filter having a color of G, green, and B (blue), and a common electrode (not shown) are formed on the black matrix and the color filter.

Pixel electrodes (not shown) and common electrodes (not shown) respectively formed on the lower substrate 12 and the upper substrate 11 are indium-tin oxides for transmitting light emitted from the backlight. -oxide: It is composed of transparent conductive metal such as ITO).

The liquid crystal molecules 18 of the liquid crystal layer 13 formed between the upper substrate 11 and the lower substrate 12 are formed by the alignment layer (not shown) formed on the surfaces of the two substrates facing each other. The azimuth angles from 12) to the upper substrate 11 are twisted by 90 degrees.

That is, white light irradiated from the backlight is polarized in one direction by the first polarizing plate 14, and the light polarized by the first polarizing plate 14 is refracted by the lower substrate 12 and the liquid crystal layer 13. do.

At this time, as shown, the light incident on the liquid crystal layer 13 is refracted to be orthogonal to the direction polarized by the first polarizing plate 14 by rotating the azimuth angle by 90 degrees by the twisting of the liquid crystal molecules 18. . As such, the intensity of transmitted light may be adjusted by adjusting the azimuth or polar angle of the liquid crystal molecules 18 in the liquid crystal layer 13.

In addition, the white light refracted by the liquid crystal layer 13 passes through the upper substrate 11 on which a color filter (not shown) capable of expressing an RGB color is formed, and the upper substrate 11 has a color. Light passes through the second polarizing plate 15 and is represented as an image.

Accordingly, a general liquid crystal display device may implement an image by adjusting the intensity of transmitted light after expressing polarization and refraction using light irradiated from a backlight and expressing color.

Referring to the planar structure of the liquid crystal display of the prior art as follows.

FIG. 2 is a plan view of a liquid crystal display according to the prior art, and the liquid crystal display according to the prior art includes a plurality of gate lines 16 formed in one direction between the lower substrate 12 and the upper substrate 11 facing each other. A plurality of data lines 17 perpendicular to the gate lines 16, a plurality of pixel regions 20 defined by the gate lines 16 and the data lines 17, and the plurality of pixel regions 20. And a sealant 23 for bonding the lower substrate 12 and the upper substrate 11 to the outside of the active region 21.

Although not shown, a thin film transistor for switching a driving signal is formed at a portion where the gate line 16 and the data line 17 cross each other, and the lower substrate 12 and the outer portion of the sealant 23 are formed. It further comprises a silver paste formed in a dot shape at a predetermined interval distance to electrically connect the upper substrate 11.

In this case, the sealant 23 serves to bond the lower substrate 12 and the upper substrate 11 as well as the active region 21 to protect the liquid crystal (18 in FIG. 1) in the active region 21. ) Is formed to surround.

3 is a cross-sectional view taken along line II ′ of FIG. 2, and the liquid crystal display device of the related art has a gate line (16 in FIG. 2) and a gate line 16 formed in one direction on the lower substrate 12. An island shape formed on the gate electrode 31 formed to protrude, the gate insulating film 32 formed on the entire surface of the lower substrate 12 including the gate electrode 31, and on the gate insulating film 32 above the gate electrode 31. And a source / drain electrodes 34a and 34b formed at the same time as the data line 17 at both edges of the semiconductor layer 33. In this case, a thin film transistor including the gate electrode 31, the gate insulating layer 32, the semiconductor layer 32, and the source / drain electrodes 34a and 34b is formed.

A passivation layer 35 formed on the entire lower substrate 12 including the thin film transistor, a pixel electrode 36 formed on the passivation layer 35 to be connected to the drain electrode 34b, and on the pixel electrode 36. It further comprises a first alignment layer 37a for regular alignment of the liquid crystal (18 in FIG. 1).

In addition, a black matrix 38 formed on the upper substrate 11 to block light of portions corresponding to the gate line 16, the data line 17, and the thin film transistor, and on the black matrix 38. A color filter 39 formed to realize RG B color, a common electrode 40 formed to make a potential difference from the pixel electrode 36 of the lower substrate 12, and a liquid crystal (C) on the common electrode 40. It further comprises a second alignment layer 37b formed for the regular orientation of 18) of FIG.

In addition, the spacer 41 for maintaining a predetermined space of the lower substrate 12 and the upper substrate 11 facing each other, and the bonding of the two substrates to the edges of the lower substrate 12 and the upper substrate 11 And a liquid crystal layer 13 formed between the two substrates surrounded by the sealant 23.

Here, the liquid crystal layer 13 is formed between the lower substrate 12 and the upper substrate 11, and is sealed by the sealant 23 to protect it from foreign matter and to prevent leakage to the outside.

In this case, the sealant 23 mainly uses a thermosetting sealant as an adhesive material for bonding the lower substrate 12 and the upper substrate 11, wherein the sealant 23 is the liquid crystal made of an ionic organic compound. Can easily react with

Therefore, the liquid crystal display of the related art is formed by separating the sealant 23 from the active region 21 by a predetermined portion so that the active region 21 may be contaminated even if the liquid crystal 18 adjacent to the sealant 23 is contaminated. Can reduce the influence on the liquid crystal 18.

Looking at the manufacturing method of the conventional liquid crystal display device configured as described above is as follows.

First, the gate line 16 in one direction and the gate electrode 31 protruding from the gate line 16 are formed on the lower substrate 12 using the conductive metal, and the gate electrode 31 is formed. The gate insulating layer 32 is formed on the entire lower substrate 12.

Next, the semiconductor layer 33 is formed in an island shape on the gate insulating layer 32 on the upper side of the gate electrode 31, and has a predetermined distance from the center of the semiconductor layer 33 to the gate insulating layer 32. Some overlapping conductive metal source / drain electrodes 34a, 34b and data lines 17 are formed.

Thereafter, a passivation layer 35 is formed on the lower substrate 12 including the drain electrode 34b, and is electrically connected to the drain electrode 34b on the passivation layer 35 and indium tin oxide (ITO). The pixel electrode 36 is formed using a conductive transparent metal such as), and a first alignment layer 37a is formed on the lower substrate 12 on which the pixel electrode 36 is formed.

In addition, a black matrix 38 is formed on the upper substrate 11 facing the lower substrate 12 to prevent light leakage to the gate line 16, the data line 17, and the thin film transistor. A color filter 39 is formed using a pigment of RGB color in the pixel region 20 where the black matrix 38 is not formed, and a conductive transparent metal is formed on the upper substrate 11 on which the color filter 39 is formed. After the formation of the common electrode 40, the second alignment layer 37b is formed on the upper substrate 11 on which the common electrode 40 is formed.

Finally, a spacer 41 is scattered on the lower substrate 12 or the upper substrate 11, and the liquid crystal injection holes 22 are disposed outside the lower substrate 12 to the upper substrate 11. Applying a sealant 23 to the portion, bonding the two substrates, cutting a plurality of cells (not shown), respectively, and using a vacuum injection method to form a liquid crystal 18 between the two substrates of the cell After the injection, the liquid crystal injection hole 22 is sealed to complete the liquid crystal display manufacturing process.

As a result, the liquid crystal display of the related art is formed to surround the active region by being spaced apart from the active region by a predetermined portion using a thermosetting sealant to prevent contamination from the sealant.

However, the liquid crystal display of the prior art has the following problems.

The liquid crystal display of the related art is formed a predetermined portion away from the active region and the sealant, but since there is no structure that shields the flow of the contaminated liquid crystal due to the reaction with the sealant, the contaminated liquid crystal can be easily introduced into the active region. This may cause liquid crystal stains.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a liquid crystal display device and a method of manufacturing the same, which can reduce liquid crystal stain defects by forming a liquid crystal inflow preventing barrier between the active region and the sealant. .

1 is a schematic perspective view of a general liquid crystal display device.

2 is a schematic plan view of a liquid crystal display of the prior art.

3 is a cross-sectional view taken along line II ′ of FIG. 1.

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

5 is a cross-sectional view taken along line II-II 'of FIG. 4.

6 to 10 are sectional views taken along the line II-II 'of FIG. 4.

* Description of the main parts of the drawings *

101: lower substrate 102: upper substrate

103: gate line 104: data line

105: pixel area 106: active area

107: Sealant 108: Liquid crystal inflow prevention barrier

109: liquid crystal injection hole 110: gate electrode

111 gate insulating film 112 semiconductor layer

113a: source electrode 113b: drain electrode

114: protective film 115: pixel electrode

116a: first alignment layer 116b: second alignment layer

117: Black Matrix 118: Color Filter

119: common electrode 120: spacer

121: liquid crystal layer

According to an aspect of the present invention, there is provided a liquid crystal display device including: a pixel region defined by a gate line and a data line formed vertically and horizontally on a lower substrate, an upper substrate opposing the lower substrate, and having a color filter; And a liquid crystal formed between the upper substrate, a seal formed on the outer side of the pixel region, and a liquid crystal inflow preventing barrier formed between the seal and the pixel region.

Here, the liquid crystal inflow preventing barrier is the same material as the color filter.

The liquid crystal inflow preventing barrier is formed using a pigment of R.G.B color of the color filter.

The liquid crystal inflow preventing barrier is formed along a sealant of the liquid crystal injection hole formed to inject the liquid crystal.

In addition, another aspect of the present invention, forming a pixel region by forming a gate line and a data line on the lower substrate, forming a thin film transistor and a pixel electrode in the pixel region, and a color filter layer on the upper substrate And forming a liquid crystal inflow prevention barrier on the outside of the pixel region, forming a common electrode on the color filter layer and the liquid crystal inflow prevention barrier, and surrounding the liquid crystal inflow prevention barrier of the lower substrate and the upper substrate. And forming a liquid crystal layer between the lower substrate and the upper substrate.

In the liquid crystal display of the present invention, a liquid crystal inflow prevention barrier may be formed outside the active area to prevent the liquid crystal from flowing.

That is, the liquid crystal display device of the present invention prevents liquid crystal staining by preventing the liquid crystal contaminated by the reaction with the seal agent from flowing into the active region by forming a liquid crystal inflow preventing barrier between the active region and the sealant. can do.

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

4 is a schematic plan view of a liquid crystal display according to the present invention.

As shown in FIG. 4, the liquid crystal display according to the present invention has a lower substrate 101 on which a thin film transistor (not shown) and a pixel electrode (not shown) are formed, and opposes the lower substrate 101 to RGB. An upper substrate 102 having a color filter (not shown) for realizing color, a liquid crystal (not shown) injected between the lower substrate 101 and the upper substrate 102, and the lower substrate. Defined by a plurality of gate lines 103 formed in one direction on the 101, a plurality of data lines 104 perpendicular to the gate line 103, the gate lines 103 and the data lines 104. Sealing agent formed at a predetermined distance from the outer periphery of the active region 106 consisting of a plurality of the pixel region 105 to bond the plurality of pixel regions 105 and the lower substrate 101 and the upper substrate 102 (107) (sealant), the sealant 107 and the liquid It is configured to include a barrier preventing the liquid crystal inlet 108 is formed to prevent the liquid flow between the probe regions 106.

In this case, the liquid crystal inflow preventing barrier 108 is a dummy pattern formed in a line shape to minimize the flow of the liquid crystal formed between the sealant 107 and the active region 106, and the sealant 107. The liquid crystal contaminated by the liquid crystal may be prevented from flowing into the active region 106. In addition, the liquid crystal inflow preventing barrier 108 is formed along the sealant of the liquid crystal injection hole 109.

Accordingly, in the liquid crystal display of the present invention, a liquid crystal inflow preventing barrier 108 is provided between the active region 106 and the sealant 107 so that the liquid crystal contaminated by the reaction with the sealant 107 is inside the active region 106. Since it is possible to prevent the inflow to the liquid crystal irregularities in the active region 106 can be prevented.

In addition, the liquid crystal inflow preventing barrier has a constant width and height and is formed of the same material as the color filter.

FIG. 5 is a cross-sectional view taken along line II to II 'of FIG. 4, and the liquid crystal display according to the present invention includes a gate line 103 formed in one direction on the lower substrate 101 and a gate electrode formed to protrude from the gate line 103. A gate insulating layer 111 formed on the entire surface of the lower substrate 101 including the gate line 103, and a semiconductor layer 112 formed in an island shape on the gate insulating layer 111 above the gate electrode 110. And source / drain electrodes 113a and 113b including data lines 104 at both edges of the semiconductor layer 112. In this case, a thin film transistor (not shown) including the gate electrode 110, the gate insulating layer 111, the semiconductor layer 112, and the source / drain electrodes 113a and 113b is formed.

The passivation layer 114 formed on the entire lower substrate 101 including the thin film transistor and the pixel electrode formed to be connected to the drain electrode 113b through the contact hole (not shown) on the passivation layer 114. 115 and a first alignment layer 116a for alignment of liquid crystal (not shown) on the pixel electrode 115.

In addition, an active layer comprising a black matrix 117 formed on the upper substrate 102 to block light to the pixel region 105 in FIG. 4, and a plurality of pixel regions 105 formed on the black matrix 117. A color filter 118 formed to implement RG B color in the region 106 of FIG. 1 and a liquid crystal inflow prevention barrier 108 formed simultaneously with the color filter 118 outside the active region 106, and A common electrode 119 formed on the color filter 118 and the active region 106 to make a potential difference from the pixel electrode 115, and a second alignment layer formed on the common electrode 119 for regular arrangement of liquid crystals; 116b is further included.

The liquid crystal inflow preventing barrier for bonding the spacer 120 to maintain a predetermined space of the lower substrate 101 and the upper substrate 102 and the lower substrate 101 and the upper substrate 102 to face each other. (108) It further comprises a sealant 107 formed on the outside, and the liquid crystal layer 121 formed between the two substrates surrounded by the sealant 107.

Here, the liquid crystal layer 121 is protected from foreign matter by the sealant 107 and is sealed to prevent leakage to the outside.

In addition, the liquid crystal inflow preventing barrier 108 is formed on the upper substrate 102 simultaneously with the color filter 118 and has a constant height to minimize the flow of the liquid crystal adjacent to the sealant 107.

In this case, the height of the liquid crystal inflow barrier 108 may be adjusted to be less than or equal to the gap between the two substrates, and the R.G.B pigments used in the color filter 118 may be adjusted in a single layer or a plurality of layers, respectively.

That is, in the active region 106, the color filter 118 is formed in the same layer as the color filter 118 in the pixel region 105, but in the outside of the active region 106, the pigments of the RGB are stacked. By forming a multilayer structure, the height of the liquid crystal inflow prevention barrier 108 may be increased.

In addition, the liquid crystal inflow preventing barrier 108 may be formed using one of the pigments of each of the R.G.B colors.

The manufacturing method of the liquid crystal display device of the present invention configured as described above is as follows.

6 to 10 are cross-sectional views of manufacturing a liquid crystal display of the present invention.

First, as shown in FIG. 6, a gate line (103 in FIG. 1) and a gate electrode 110 protruding from the gate line 103 are formed on the lower substrate 101 using a conductive metal. The gate insulating layer 111 is formed over the lower substrate 101 including the gate electrode 110, and the semiconductor layer 112 is formed on the gate insulating layer 111 on the upper side of the gate electrode 110. ) And the source / drain electrodes 113a and 113b and the data line 104 of the conductive metal partially overlapping the gate insulating layer 111 at a predetermined distance from the center of the semiconductor layer 112.

Next, a passivation layer 114 is formed on the lower substrate 101 including the drain electrode 113b, and is electrically connected to the drain electrode 113b on the passivation layer 114 and is indium tin oxide (ITO). The pixel electrode 115 is formed using a conductive transparent metal such as the first, and a first alignment layer 116a is formed on the lower substrate 101 on which the pixel electrode 115 is formed.

As shown in FIG. 7, the gate line 103, the data line 104, the thin film transistor and the active region (106 of FIG. 4) are disposed on the upper substrate 102 facing the lower substrate 101. The black matrix 117 is formed to prevent light leakage to the edge.

Next, as shown in FIG. 8, the color filter 118 is formed using pigments of each color to have the R.G.B color in the pixel region (105 in FIG. 4) of the active region 106.

In this case, at the same time as the color filter 118 is formed, the liquid crystal flows in such a manner as to surround the active region 106 at the periphery of the active region 106 in a single layer or a multilayer structure using the same RGB pigment as the color filter 118. Forming a barrier 108.

Thereafter, as shown in FIG. 9, the common electrode 119 is formed on the upper substrate 102 on which the liquid crystal inflow preventing barrier 108 is formed by using a conductive transparent metal, and the common electrode 119 is formed. The second alignment layer 116b is formed on the formed upper substrate 102.

Finally, the spacer 120 is distributed on the lower substrate 101 or the upper substrate 102, except for the liquid crystal inlet (109 of FIG. 1) outside the lower substrate 101 to the upper substrate 102. Applying a sealant 107 to the part, bonding the two substrates, cutting a plurality of cells, respectively, and injecting a liquid crystal between the two substrates of the cell using a vacuum injection method, and then the liquid crystal injection hole 109 By sealing, the liquid crystal display manufacturing process is completed.

In this case, the liquid crystal injected into the active region 106 by the liquid crystal inflow prevention barrier 108 formed along the sealant 107 of the liquid crystal injection hole 109 does not directly contact the sealant 107 when the liquid crystal is injected. Therefore, contamination of the liquid crystal can be prevented.

As a result, in the liquid crystal display of the present invention, the sealant 107 is formed inside the active region 106 by forming a barrier 108 for preventing the inflow of liquid crystal simultaneously with the color filter 118 between the active region 106 and the sealant 107. Can prevent the inflow of the contaminated liquid crystal and prevent the inflow of contaminated liquid crystal.

As described above, the liquid crystal display of the present invention and its manufacturing method have the following effects.

The liquid crystal display of the present invention and a method of manufacturing the same prevent the inflow of the sealant into the active region by forming a barrier to prevent liquid crystal inflow using a pigment such as a color filter between the active region and the sealant, thereby preventing the inflow of contaminated liquid crystal. Since it can prevent, liquid-crystal stain defect can be prevented.

Claims (8)

A pixel region defined by gate lines and data lines formed vertically and horizontally on the lower substrate; An upper substrate facing the lower substrate and having a color filter formed thereon; A liquid crystal formed between the lower substrate and the upper substrate, A sealant formed at an outer side of the pixel region; And a liquid crystal inflow prevention barrier formed between the sealant and the pixel region. The liquid crystal display of claim 1, wherein the liquid crystal inflow preventing barrier is made of the same material as the color filter. The liquid crystal display device according to claim 1, wherein the liquid crystal inflow preventing barrier is formed by using a pigment of R.G.B color of the color filter. The liquid crystal display device according to claim 3, wherein the liquid crystal inflow preventing barrier is formed of a multilayer structure in which at least two or more pigments of each of the R.G.B colors are stacked. 4. The liquid crystal display device according to claim 3, wherein the liquid crystal inflow preventing barrier is formed of a single layer using any one color pigment among the pigments of each of the R.G.B colors. The liquid crystal display of claim 1, wherein the liquid crystal inflow preventing barrier is formed along a sealant of a liquid crystal injection hole formed to inject the liquid crystal. Forming a pixel region by forming a gate line and a data line on the lower substrate; Forming a thin film transistor and a pixel electrode in the pixel region; Forming a color filter layer on the upper substrate and forming a liquid crystal inflow prevention barrier outside the pixel region; Forming a common electrode on the color filter layer and the liquid crystal inflow prevention barrier; Forming a sealant outside the liquid crystal inflow barrier of the lower substrate and the upper substrate; And forming a liquid crystal layer between the lower substrate and the upper substrate. 8. The method of claim 7, wherein the liquid crystal inflow preventing barrier is formed around the pixel area.