KR20180078925A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of blocking static electricity flowing through a color filter substrate. The liquid crystal display device comprises a first substrate; a second substrate facing the first substrate and having a first black matrix; a sealant attaching the first substrate and the second substrate together; and a second black matrix disposed on the second substrate and spaced apart from the first black matrix to the outside of a panel in a region corresponding to the sealant.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

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 capable of effectively preventing defects caused by external static electricity.

In recent years, the display field has been rapidly developed in line with the information age, and as a flat panel display device (FPD) having the advantages of thinning, lightening, and low power consumption in response to the recent information age, A plasma display panel (PDP), an electroluminescence display device (ELD), a field emission display device (FED), and the like have been introduced. In particular, And is used as a typical flat panel display device because of the ease of driving means and the realization of high image quality.

Such a liquid crystal display (LCD) includes an array substrate including a thin film transistor, an upper substrate provided with a color filter and / or a black matrix, and a liquid crystal layer formed therebetween, And the liquid crystal layer is arranged according to an electric field applied between the pixel electrodes and the light transmittance is controlled thereby to display an image.

As shown in FIG. 1, the liquid crystal display panel is divided into a display area AA and a non-display area NA. The non-display area NA is arranged around the display area AA. That is, the non-display area NA is arranged to surround the display area AA. Also, the display area AA includes a plurality of pixel areas. Although not shown in the figure, the gate wiring extends to the non-display area NA and is connected to the gate pad.

The gate pad is connected to the circuit board. Although not shown in the drawing, a data line (not shown) extends to the non-display area NA and is connected to the data pad. In addition, the data pad is connected to a circuit board.

1 and 2, a conventional liquid crystal display panel includes a first substrate 10 and a second substrate 20, and a liquid crystal layer (not shown) formed between the first substrate 10 and the second substrate 20 ). The first substrate 10 is a driving element array substrate. Although not shown in the figure, a plurality of pixels are formed on the first substrate 10, and a driving element such as a thin film transistor (TFT) is formed in each pixel. The second substrate 20 is a color filter substrate, and a color filter layer 21 and a black matrix 30 for realizing colors are formed. A pixel electrode and a common electrode are formed on the first substrate 10 and an alignment film (not shown) for aligning the liquid crystal molecules of the liquid crystal layer (not shown) is formed on the first substrate 10 and the second substrate 20, Hour) is applied.

The first substrate 10 and the second substrate 20 are bonded together by a sealant 40 and a liquid crystal layer (not shown) is formed therebetween to form the first substrate 10 The liquid crystal molecules are driven by the driving element to emit light in the backlight portion and supplied to the liquid crystal layer (not shown) to control the amount of transmitted light to display information.

Also, a black matrix 30 is formed on the second substrate 20, which is adhered to the first substrate 10 and opposed to the first substrate 10.

2 and 3, according to the conventional liquid crystal display panel, the black matrix 30 provided on the second substrate 20 is formed to reflect the cutting tolerance D, That is, the black matrix 30 may be formed up to the end of the second substrate 20. However, when the black matrix 30 is disposed directly on the end of the second substrate 20, The cutting line 55, that is, the end of the substrate and the black matrix 30 may have a bad influence on the black matrix 30 during the cell cutting process of the display panel, It is preferable to maintain a cutting tolerance D that separates the first and second flat plates from each other at regular intervals.

Here, the cutting line 55 is a line along which the substrate is cut when it is separated into unit panels in the cutting process. As shown in FIG. 3, the cutting key 50 is disposed to facilitate cutting.

The sealant 40 is disposed in a non-display area NA to prevent leakage of the liquid crystal layer (not shown) and to adhere the first substrate 10 and the second substrate 20 .

The unit panels assembled by the sealant 40 are separated through a cell cutting process. As the cutting process and the subsequent processes proceed, static electricity flows through the color filter substrate as the second substrate 20 Electrostatically unevenness occurs, which causes problems such as poor driving and poor screen image.

Therefore, the static electricity flowing through the second substrate affects the screen display region of the liquid crystal display device, which causes a driving failure and a screen abnormal phenomenon.

In order to solve the above-described problems, an embodiment of the present invention provides a liquid crystal display device comprising a first black matrix provided on a non-display area and a second black matrix disposed on a second substrate, It is possible to provide a liquid crystal display device capable of blocking static electricity flowing from the outside to the display region through the second substrate in the cell cutting process and the subsequent processes by including the disposed second black matrix.

It is another object of the present invention to provide a liquid crystal display device capable of effectively preventing static electricity and preventing light leakage by disposing the spacing between the first black matrix and the second black matrix in the outer direction of the panel relative to the region corresponding to the sealant .

According to an aspect of the present invention, there is provided a liquid crystal display device including a first substrate, a second substrate facing the first substrate and having a first black matrix, and a second substrate facing the first substrate, And a second black matrix including a sealant and spaced apart from the first black matrix in an outer direction of the panel than a region corresponding to the sealant and disposed on the second substrate.

The spacing between the first black matrix and the second black matrix may be located outside the panel in a region corresponding to the sealant.

The liquid crystal display device according to the present invention includes the second black matrix disposed on the second substrate and spaced apart from the first black matrix in the outer direction of the panel with respect to the area corresponding to the first black matrix and the sealant, It is possible to effectively prevent the static electricity flowing into the display area through the upper substrate to prevent the generation of static spots and to improve the driving defects and the screen abnormal phenomenon due to the static spots.

In addition, the spacing between the first black matrix and the second black matrix is arranged in a direction outside the panel corresponding to the sealant, thereby effectively preventing static electricity and preventing light leakage.

1 is a schematic plan view of a conventional liquid crystal display device.
2 is a schematic cross-sectional view of a conventional liquid crystal display device.
3 is a plan view schematically showing a black matrix and a cutting line provided in a non-display area of a liquid crystal display according to a related art.
4 is a schematic cross-sectional view of a liquid crystal display device according to the present invention.
5 is a plan view schematically showing a black matrix and a cutting line provided in a non-display region of a liquid crystal display device according to an embodiment of the present invention.
6 is a plan view schematically showing another form of a black matrix provided in a non-display area of a liquid crystal display device according to an embodiment of the present invention.
7 is a cross-sectional view schematically showing a liquid crystal display according to a further embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the constituent elements of the present invention, terms such as first, second and A, B and the like can be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

First, the liquid crystal display according to the first embodiment will be described with reference to FIG. 4 is a schematic cross-sectional view of a liquid crystal display device according to the first embodiment of the present invention. 5 is a plan view schematically showing a black matrix and a cutting line provided in a non-display area of a liquid crystal display device according to a first embodiment of the present invention.

4 and 5, the liquid crystal display panel according to the first embodiment includes a first substrate 100 and a second substrate 200 that are divided into a display area AA and a non-display area NA . The first substrate 100 and the second substrate 200 are insulating substrates, and are formed of glass or plastic.

A liquid crystal layer (not shown) is interposed between the first substrate 100 and the second substrate 200. A sealant 400 is provided between the first substrate 100 and the second substrate 200.

The liquid crystal layer (not shown) is disposed in the display area AA. The sealant 400 is disposed in a non-display area NA to prevent the leakage of the liquid crystal layer and adhere the first substrate 100 and the second substrate 200 together.

The non-display area NA is arranged around the display area AA. That is, the non-display area NA is arranged to surround the display area AA. Also, the display area AA includes a plurality of pixel areas. Gate wirings (not shown) are formed in one direction on the first substrate 100, and data wirings (not shown) are formed in a direction different from the one direction. At this time, the gate line and the data line intersect with each other to define a pixel region in the display area AA.

Although not shown in the figure, the gate wiring extends to the non-display area NA and is connected to the gate pad. The gate pad is connected to the circuit board. Also, although not shown in the drawing, the data line extends to the non-display area NA and is connected to the data pad. In addition, the data pad is connected to a circuit board.

That is, in the display area AA, an intersection region of the gate line and the data line is formed on the first substrate 100, and a thin film transistor is formed in the intersection region. The thin film transistor includes a gate metal 101, a semiconductor layer, and a source and drain metal 103.

An active layer and an ohmic contact layer (not shown) are stacked on the gate wiring on the first substrate 100 in the display area AA and on the gate insulating layer 102 on the gate metal 101 have.

The gate metal layer 101 is formed by sputtering a metal such as Mo, Al, or Al alloy on the first substrate 100 and then etching the gate metal layer 101. The gate insulating layer 102 is formed of SiO ₂ or SiN ₂ by a PECVD (Plasma Enhanced Chemical Vapor Deposition) method.

A source and drain metal 103 separated from each other is formed on the active layer and the ohmic contact layer. At this time, a data line (not shown) extends from the source electrode, and the data line (not shown) is formed in the other direction crossing the gate line (not shown).

The gate metal 101, the active layer, and the source and drain metal 103 constitute a thin film transistor T.

A protective layer 104 is formed on the entire surface of the first substrate 100 including the source and drain metal layers 103. A drain contact hole (not shown) exposing a portion of the drain electrode may be formed in a portion of the protective layer 104, Respectively.

A pixel electrode (not shown) electrically connected to the drain electrode is formed on the passivation layer 104 including the drain contact hole (not shown).

The pixel electrode (not shown) may be formed by laminating a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide), and then etching or metal such as Mo, Cr, Cu, Al, Al alloy, Followed by etching.

A lower alignment layer (not shown) is formed on the protective layer including the pixel electrode (not shown).

First black matrices 300 and 310 are formed on a second substrate 200, which is adhered to the first substrate 100 in a confronting manner.

In the display area AA, a first black matrix 300 and a color filter layer 201 are formed on a first surface of the second substrate 200. In addition, the second substrate 200 includes a red sub-pixel that emits red light in the display area AA, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light. In addition, the second substrate 200 may further include a white sub-pixel for realizing a white color.

The sub-pixel is defined by the first black matrix A (300). The first black matrix A 300 is arranged in the form of a lattice or a mesh to form openings in the pixel region P. [ A color filter layer 201 of red, green, and blue is formed corresponding to the openings to form sub-pixels, respectively.

The black matrixes 300 and 310 formed on the second substrate 200 prevent leakage of light to the gate line formation region and the data line formation region of the dummy region of the first substrate 100 and the image display region In regions corresponding to the regions.

The black matrices 300 and 310 are formed of a black material. The black matrices 300 and 310 may be formed of a metal oxide such as CrO or CrO2 or a black resin.

Thus, only the light passing through the opening formed in the pixel region P is emitted from the light source, and unintended light is blocked, thereby improving the contrast ratio.

An overcoat layer 202 may be formed on the first surface of the second substrate 200 on the black matrices 300 and 310 and the color filter layer 201.

The overcoat layer 202 is formed on the entire surface of the second substrate 200 on the first surface. The overcoat layer (202) flatens the level difference caused by the black matrix (300, 310) and the color filter layer (201).

At this time, the first black matrix B 310 is formed in the non-display area NA and is spaced apart from the first black matrix B 310 in a direction outside the panel corresponding to the sealant 400 And a second black matrix 320 disposed thereon.

The first black matrix B 310 and the second black matrix 320 are spaced apart by a predetermined spacing S therebetween.

 At this time, the second black matrix 320 must be located in a direction outside the panel corresponding to the sealant 400.

When the spacing S between the first black matrix 310 and the second black matrix 320 is formed in the inner side of the panel corresponding to the sealant 400, Light leakage may occur, and the user may be visually impaired and the quality of the display device may be deteriorated. Accordingly, the second black matrix 320 spaced apart from the first black matrix 310 by a predetermined spacing S must be positioned outside the region corresponding to the sealant 400 in the outer direction of the panel .

In order to prevent the second black matrix 320 located in the non-display area NA from being damaged during the cell cutting process for separating into the unit panels, the second black matrix 320 has a cutting tolerance D1 ). That is, the second black matrix 320 may be formed to the end of the second substrate 200, but the second black matrix 320 may be directly disposed at the end of the second substrate 200 The cutting line 55, that is, the end of the substrate and the black matrix 320 may be formed on the surface of the black matrix 320. In this case, the second black matrix 320 may have a bad influence on cutting or damaging the second black matrix 320 during the cutting process of the liquid crystal display panel. It is desirable to maintain a cutting tolerance D1 that makes the gap between the first and second electrodes spaced at regular intervals.

Accordingly, a cutting tolerance D1 is formed between the end of the second black matrix 320 and the cutting line 55, that is, the end of the second substrate 200, .

Specifically, when the cutting tolerance D1 is less than 50 .mu.m, the second black matrix 320 may be cut off during the substrate cutting process. In this case, the second black matrix 320 may be damaged, The incoming static electricity can not be blocked.

In addition, the cutting tolerance D1 should be less than 100 um. Larger than this may cause the bezel to increase more than necessary, which can have a negative effect on the aesthetics.

The width W of the second black matrix 320 may be equal to or greater than the spacing S between the first black matrix B 310 and the second black matrix 320.

When the width W of the second black matrix 320 is smaller than the spacing S, the external static electricity does not flow through the second substrate 200 toward the image display unit AA Is difficult to prevent.

As described above, the reason why the panel designing device and the cutting tolerance D1 are reflected is to protect the black matrix in the panel and to prevent the external static electricity from flowing into the substrate cutting process and the subsequent processes.

However, even when the cutting tolerance is reflected, external static electricity flows, resulting in driving failure and screen abnormal phenomenon. In order to solve such a problem, according to the present invention, after the cutting tolerance D1 is reflected, the second black matrix 320 of the floating type is additionally arranged to effectively block the flow of external static electricity.

The second black matrix 320 may be designed according to the distance between the first black matrix B 310 and the cutting line 55 or the end of the second substrate 200. The first black matrix B 310 and the second black matrix 320 are spaced apart from the area corresponding to the sealant 400 in the outboard direction of the panel.

When the spacing S between the first black matrix 310 and the second black matrix 320 is formed in the panel inner direction from the area corresponding to the sealant 400, Light leakage may occur, and the user may be visually impaired and the quality of the display device may deteriorate.

The width W of the second black matrix 320 may be equal to or larger than the spacing S between the first black matrix B 310 and the second black matrix 320, When the width W of the black matrix 320 is smaller than the spacing S between the first black matrix B 310 and the second black matrix 320, the static electricity flowing from the outside to the image display unit AA It is difficult to block.

Referring to FIG. 5, the second black matrix 320 is disposed in the form of a floating bar at the outermost portion of the upper substrate, that is, the second substrate 200.

Therefore, it can serve as a blocking wall for preventing static electricity from entering from the outside.

Further, as shown in FIG. 6, the second black matrix 320 may have a broken line shape or a dual structure. When formed as a double structure, it may be more effective in blocking static electricity.

The width W of the second black matrix 320 may be equal to or greater than the spacing S between the first black matrix B 310 and the second black matrix 320.

In detail, the spacing between the first black matrix B 310 and the second black matrix 320 is preferably 50 μm or more and 100 μm or less.

Next, a liquid crystal display according to another embodiment of the present invention will be described with reference to FIG. 7 is a cross-sectional view schematically showing a liquid crystal display device according to a further embodiment of the present invention.

The liquid crystal display according to another embodiment of the present invention may include a similar structure to the liquid crystal display according to the above-described embodiments. The description overlapping with the embodiment described above may be omitted. The same reference numerals are assigned to the same components.

7, the spacing S between the first black matrix B 310 and the second black matrix 320 is less than or equal to the width W of the second black matrix 320.

Therefore, it can effectively serve as a blocking wall for preventing static electricity flowing from the outside to the image display unit AA through the second substrate 300.

In addition, a blocking pattern 150 is additionally provided on the first substrate 100 corresponding to the spacing S between the first black matrix B 310 and the second black matrix 320. .

The blocking pattern 150 may be an ITO pattern.

In addition, the blocking pattern 150 may be formed in a floating form and may be provided on the first substrate 100, that is, the uppermost layer of the array substrate.

The barrier pattern 150 may have a width PW corresponding to the spacing S between the first black matrix B 310 and the second black matrix 320.

The blocking pattern 150 is provided in a floating state separately from the circuit portion of the first substrate 100 and serves as an additional blocking wall for preventing static electricity from flowing from the outside.

As a result, it is possible to effectively block the static electricity flowing from the outside and to prevent the driving failure and the screen abnormal phenomenon caused thereby.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong.

Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

100, 200: substrate 101: gate metal
102: gate insulating layer 103: source / drain metal
104: insulating film 201: color filter layer
202: Overcoat layer 203: Spacer
300: First Black Matrix A 400: Sealant
310: first black matrix B
320: Second Black Matrix

Claims (13)

A first substrate;
A second substrate facing the first substrate and having a first black matrix; And
And a sealant for attaching the first substrate and the second substrate together,
And a second black matrix disposed on the second substrate spaced apart from the first black matrix in a direction outside the panel corresponding to the sealant,
The method according to claim 1,
And the second black matrix is in the form of a floating bar.
The method according to claim 1,
Wherein the spacing between the first black matrix and the second black matrix is larger than the area corresponding to the sealant,
The method according to claim 1,
Wherein a spacing between the first black matrix and the second black matrix is equal to or smaller than a width (W) of the second black matrix,
The method according to claim 1,
And the spacing between the first black matrix and the second black matrix is not less than 5 μm and not more than 100 μm.
The method according to claim 1,
And the second black matrix has a double structure.
The method according to claim 1,
And the second black matrix is in the form of a broken line.
The method according to claim 1,
And the second black matrix is spaced apart from a cutting line along which the substrate is cut.
9. The method of claim 8,
And a distance between the second black matrix and the cutting line is 50um or more and 100um or less.
The method according to claim 1,
And the second black matrix is spaced apart from the end of the second substrate by a predetermined distance,
The method according to claim 1,
And a blocking pattern is further provided on the first substrate corresponding to a spacing distance between the first black matrix and the second black matrix,
12. The method of claim 11,
The blocking pattern is an ITO pattern,
12. The method of claim 11,
The width of the blocking pattern is the same as the interval between the first black matrix and the second black matrix.

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