KR20130025219A

KR20130025219A - Liquid crystal display

Info

Publication number: KR20130025219A
Application number: KR1020110088608A
Authority: KR
Inventors: 김홍식; 남철; 신승환; 최형종
Original assignee: 엘지디스플레이 주식회사
Priority date: 2011-09-01
Filing date: 2011-09-01
Publication date: 2013-03-11

Abstract

PURPOSE: A liquid crystal display is provided to shorten the pitch between column spacers by forming column spacers having a triangle structure in a non-display area. CONSTITUTION: A thin film transistor substrate(120) includes a displaying area and a non-display area. A first column spacer(160) separates the thin film transistor substrate from a color filter substrate(110) in the displaying area. A first column spacer is formed between the thin film transistor substrate and a color filter substrate. A second column spacer(150) having a triangle shape is arranged in the part which corresponds to the non-display area in the color filter substrate.

Description

Liquid Crystal Display {LIQUID CRYSTAL DISPLAY}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving light leakage.

Recently, various types of flat panel display devices include a liquid crystal display device, a plasma display panel, a fixed emission display device, and a light emitting display device. Device, etc. In particular, liquid crystal display devices are in the spotlight in terms of mass production technology, ease of driving means, and high definition.

FIG. 1 is a plan view showing a conventional liquid crystal display, FIG. 2 is an enlarged view showing a portion labeled 'B' in the plan view shown in FIG. 1, and FIG. 3 is a plan view A-A 'shown in FIG. It is sectional drawing of the part cut | disconnected in the direction.

As shown in FIG. 1, a conventional liquid crystal display device may be divided into a display area C in which an image is output and a non-display area D in which an image is not output. In order to prevent the thin film transistor substrate 12 and the color filter substrate 11 constituting the liquid crystal display from being spaced apart at regular intervals or to prevent the thin film transistor substrate and the color filter substrate from bending, the plurality of column spacers 15, 16) are formed.

In addition, the conventional liquid crystal display device is formed on the outermost portion of the non-display area to seal the liquid crystal layer of the liquid crystal display device from the outside, and is formed between the display area and the non-display area or inside the seal. And a dam 14 to reduce the flow of water.

The arrangement of such column spacers is generally rectangular in shape, as shown in FIG. 2.

Here, not only the column spacer 16 formed in the display area C, but also the column spacers 15 formed in the non-display area D are all arranged in a rectangular shape as shown in FIG. 2. have.

Accordingly, as shown in FIG. 3, when a force is applied to the conventional liquid crystal display device from the outside, the liquid crystal display device may be difficult to withstand the external force.

That is, in the conventional liquid crystal display device, since the arrangement of the column spacers 15 and 16 is in the form of a rectangle as shown in FIG. 2, the distance between the column spacer and the column spacer is long.

Therefore, it is not a problem when a force applied from the outside is applied to the column spacer portion, but as shown in FIG. 3, a force applied from the outside is applied to a point corresponding to L / 4 between the column spacer and the column spacer. The liquid crystal display device is greatly affected.

This effect is largely generated in the non-display area as the liquid crystal display device becomes slimmer and its shape changes to a borderless type.

In other words, in recent years, the necessity of research and development in the design aspect of products that can appeal more to the users in addition to the research and development of the technical aspects of the liquid crystal display devices has been particularly highlighted, thereby minimizing the thickness of the liquid crystal display device. Along with efforts to slim down, various borderless liquid crystal display devices have been developed in which there is no step in the plane of the liquid crystal display device.

The borderless type attaches the bottom of the outer portion of the liquid crystal display device to a case such as a panel guide using an adhesive or an adhesive tape, so that no step is visible on the plane of the liquid crystal display device exposed to the outside. have.

However, as described above, an adhesive or an adhesive tape is attached to the bottom of the non-display area that forms the outline of the liquid crystal display device, and the non-display area is spread over the panel guide or the like. As shown in FIG. 5, when the L / 4 is placed at a point corresponding to L / 4 between the column spacer and the column spacer, the point receives a large force.

As a result, a phenomenon in which the corresponding point is bent or deformed may occur, and thus, a problem such as light leakage may occur in the entire LCD.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is a technical object of the present invention to provide a liquid crystal display device in which column spacers formed in a non-display area are arranged in a triangular state with each other.

According to an aspect of the present invention, a liquid crystal display device includes a display area including pixel areas formed by intersections of gate lines and data lines, and a non-display area formed outside the display area. Thin film transistor substrate; A color filter substrate on which color filters corresponding to the pixel regions are formed; A liquid crystal layer formed between the thin film transistor substrate and the color filter substrate; A plurality of first column spacers connected between the thin film transistor substrate and the color filter substrate to space the thin film transistor substrate from the color filter substrate at regular intervals in the display area; And a plurality of second column spacers disposed in a triangular shape on a portion of the color filter substrate corresponding to the non-display area.

According to the above solution, the present invention provides the following effects.

That is, the present invention allows the column spacers formed in the non-display area to be arranged in a triangular state with each other, so that the pitch between the column spacers and the column spacers is shortened, and accordingly, the present invention is directed to external forces. The holding force can be increased.

In addition, according to the present invention, the force against the external force is increased, so that the deformation to the external force can be reduced. Therefore, the present invention attached to the panel guide portion with an adhesive or an adhesive tape can reduce light leakage defects generated in the non-display area.

That is, according to the present invention, as the pitch between the column spacers and the column spacers disposed in the non-display area is shortened, the force sustained against the force from the outside may be increased, thereby causing light leakage defects generated in the non-display area. Can be reduced.

1 is a plan view showing a conventional liquid crystal display device.
FIG. 2 is an enlarged view enlarging a portion denoted by 'B' in the top plan view of FIG. 1. FIG.
FIG. 3 is a cross-sectional view of a portion cut along the line AA ′ of FIG. 1.
4 is a plan view showing a liquid crystal display device according to the present invention.
FIG. 5 is an enlarged view illustrating a portion labeled 'F' in the plan view of FIG. 4; FIG.
FIG. 6 is a cross-sectional view of a portion taken along the line E-E 'in FIG. 4;

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

4 is a plan view showing a liquid crystal display according to the present invention, and shows only a part of the plan view of the entire liquid crystal display. In addition, FIG. 5 is an enlarged view enlarging a portion denoted by 'F' in the plan view of FIG. 4. 6 is a cross-sectional view of a portion obtained by cutting the plan view shown in FIG. 4 in the direction E-E '.

The present invention is characterized by improving the adhesion light leakage generated in the non-display area to which the adhesive or adhesive tape is attached by changing the shape of the column spacer formed in the non-display area (C).

To this end, the liquid crystal display according to the present invention includes a display area D including pixel areas formed by intersections of gate lines and data lines, and a non-display area C formed outside the display area. A thin film transistor substrate 120, a color filter substrate 110 having a color filter corresponding to pixel regions, a liquid crystal layer 170 formed between the thin film transistor substrate and a color filter substrate, and a thin film transistor substrate in the display region. In order to space the color filter substrate at regular intervals, the first column spacer 160 connected between the thin film transistor substrate and the color filter substrate and a second column arranged in a triangular shape on a portion corresponding to the non-display area of the color filter substrate. It may be configured to include a column spacer 150.

First, the thin film transistor substrate 120 has a gate line and a data line arranged perpendicularly to each other to define a pixel region, and a thin film transistor TFT is formed at a portion where each gate line and the data line cross each other. The pixel electrode is formed in the pixel region.

The thin film transistor TFT may include a gate electrode protruding from the gate line, a data electrode protruding from the data line, and a drain electrode spaced apart from the data electrode on the gate electrode by a predetermined distance.

In addition, the semiconductor layer is further formed under the data electrode and the drain electrode to cover the gate electrode.

In addition, a gate insulating film is formed on the entire surface including the gate line on the thin film transistor substrate 120, and a protective film is formed on the gate insulating film. The upper portion of the drain electrode of the passivation layer is exposed to define a contact hole, and the pixel electrode is connected to the drain electrode through the contact hole.

Here, the gate insulating film and the protective film are formed by depositing a thickness of 2000 to 4000 kPa as an inorganic insulating film component.

Meanwhile, in FIG. 6, various components as described above constituting the thin film transistor substrate 120 are simply illustrated in a plurality of layers. That is, the thin film transistor substrate 120 may generally include the components described above, but the specific configuration of the thin film transistor substrate may include a liquid crystal display device according to the present invention, TN mode, VA mode, IPS. According to the type of the various types such as the mode, FFS mode, etc. In addition, even in the case of the same type can be variously changed in various forms, in Figure 6 the shape of the thin film transistor substrate 120 is simply a plurality of layers It is shown by the bay.

In the case of the color filter substrate 110 described below, the components included in the color filter are standardized to some extent, but since their configuration forms may be changed in various ways, the color filter substrate 110 of FIG. The configuration is also shown simply with a plurality of layers.

That is, the liquid crystal display according to the present invention is characterized in that the column spacer formed between the thin film transistor substrate and the color filter substrate, and the thin film transistor substrate 120 and the color filter substrate 110 constituting the liquid crystal display device The configuration can be formed in various forms.

Meanwhile, as described above, the pixel areas formed by the intersection of the gate lines and the data lines are referred to as a display area D. That is, the viewer can visually check the image output through the display area of the liquid crystal display.

Here, the display area D refers to the entire area where the pixel areas are formed as described above, and an image may be output through the pixel area. However, the display area D may be further divided into a pixel area and a non-pixel area. That is, the pixel region is a region in which an image can be output according to the amount of light transmitted because the pixel electrode is formed, and the non-pixel region is a region formed between the pixel region and the pixel region and means a portion where light is not transmitted to the outside. .

In addition, the display area D or the non-display area C formed outside the display area is not distinguished only from the thin film transistor substrate 120 or the color filter substrate 110, but a liquid crystal display formed by bonding two substrates together. It is divided throughout the plane of the device.

4 is a plan view of the liquid crystal display according to the present invention in which the thin film transistor substrate 120 and the color filter substrate 110 are bonded to each other with the liquid crystal layer 170 interposed therebetween. The whole is divided into a display area D or a non-display area C. FIG.

Next, the color filter substrate 110 facing the thin film transistor substrate 120 includes a black matrix for covering non-pixel regions (gate lines, data lines, and thin film transistor (TFT) regions) other than the pixel region among the display regions. In addition, the thin film transistor substrate 120 may include an overcoat layer formed on the front surface of the color filter including color filters and color filters formed of R, G, and B pigments corresponding to each pixel region.

That is, the color filter substrate 110 includes a black matrix BM defining a plurality of pixel areas, and a red, green, and blue color filter formed in each pixel area defined by the black matrix. And an overcoat layer OC formed to cover the red, green, and blue color filters and the black matrix to planarize the thin film transistor substrate 110.

Here, the color filter is formed in a matrix form in the display area of the liquid crystal display to determine the color of light emitted from each pixel area.

In addition, the black matrix BM is formed in a matrix form corresponding to the external shape of each pixel area in the display area of the liquid crystal display device, so that light emitted from the pixel area does not affect light emitted from an adjacent pixel area. The function of preventing light leakage of light emitted from each pixel area is performed.

In addition, the overcoat layer OC serves to planarize the surface of the upper substrate on which the black matrix and the color filter are formed.

Meanwhile, in the liquid crystal display device, the liquid crystal of the liquid crystal layer 170 formed between the thin film transistor substrate 120 and the color filter substrate 110 is aligned by an electric field between the common electrode and the pixel electrode formed to face the pixel electrode. In order to express an image by adjusting the amount of light passing through the liquid crystal layer according to the degree of alignment of the liquid crystal layer, the common electrode which performs this function may include any type of the liquid crystal display device described above. In some embodiments, the thin film transistor substrate 120 may be formed on the thin film transistor substrate 120 or the color filter substrate 110.

Next, the liquid crystal layer 170 is composed of a liquid crystal (LIQUID CRYSTAL), and serves to adjust the amount of light transmitted according to the angle of rotation of the liquid crystal by the electric field between the common electrode and the pixel electrode.

Next, the first column spacer 160 is connected between the thin film transistor substrate and the color filter substrate to space the thin film transistor substrate and the color filter substrate at regular intervals, and is particularly formed in the display area D. Refers to the column spacer.

The first column spacer 160 performs a structure and a function similar to those of the second column spacer to be described below. Therefore, the structure and function of the first column spacer 160 are described below together with the structure and function of the second column spacer 150.

Lastly, the second column spacer 150 is arranged in a triangular shape on a portion corresponding to the non-display area of the color filter substrate, and like the first column spacer, the thin film transistor substrate and the color filter substrate are spaced at regular intervals. Or prevent the color filter substrate from sinking. Hereinafter, the first column spacer and the second column spacer will be collectively referred to as a column spacer.

As described above, a spacer is formed between the thin film transistor substrate 120 and the color filter substrate 110 of the liquid crystal display device to maintain a constant gap in which the liquid crystal layer 170 is formed. Column spacers (CS) are formed.

That is, the column spacer may be formed at a desired position with the same density throughout the liquid crystal display device, thereby maintaining a constant cell gap between the thin film transistor substrate and the color filter substrate, thereby preventing the opening ratio from being lowered. have.

On the other hand, the basic function of the column spacer is to keep the distance between the two substrates constant as described above, or the first column spacer formed in the display area D and the second column formed in the non-display area C. The shape and function of the column spacer can be slightly different.

That is, the first column spacer 160 formed in the display area D is formed to overlap the black matrix formed along the gate line. In particular, both the thin film transistor substrate 120 and the color filter substrate 110 are formed. It is formed to contact with. Accordingly, the first column spacer 160 is faithful to the basic function of the column spacer to maintain the gap between the thin film transistor substrate 120 and the color filter substrate 110.

In addition, when the first column spacer 160 is formed on the color filter substrate 110 and then the color filter substrate is bonded to the thin film transistor substrate, the first column spacer 160 adheres to a protective film, an insulating film, an alignment film, or the like formed on the uppermost surface of the thin film transistor substrate. As a result, the cell gap between the two substrates can be maintained.

In addition, the first column spacer 160 may be configured to maintain the gap between the two substrates together with the protrusions. That is, a first column spacer is formed on the color filter substrate as described above, and projections corresponding to the column spacer are formed on the thin film transistor substrate, and when the two substrates are bonded, the first column spacer and the projection contact each other. One pillar may be formed to maintain a gap between the two substrates. In this case, the protrusion may serve to prevent a depression or the like that may occur when the first column spacer directly contacts the thin film transistor substrate.

That is, the first column spacer 160 formed by being deposited on the color filter substrate 110 may be in direct contact with the thin film transistor substrate 120 to maintain the cell gap of the two substrates, and may be in contact with the protrusion to maintain the cell gap. It may be.

Meanwhile, as shown in FIG. 4, the second column spacer 150 is formed in the non-display area C to additionally maintain the gap between the thin film transistor substrate 120 and the color filter substrate 110. It can be formed through the same process as the one column spacer.

Therefore, when the first column spacer 160 is formed to be bonded to both the thin film transistor and the color filter substrate, the second column spacer 150 is also bonded to both substrates in the non-display area. Can be formed.

In addition, when the first column spacer 160 is formed in contact with the protrusions formed on the thin film transistor substrate 120 to maintain the gap between the two substrates, the first column spacer 160 is formed to have the same length as the first column spacer. Since only the second column spacer is formed, a predetermined gap Gap may be formed between the second column spacer and the thin film transistor substrate.

In addition to the above components, the liquid crystal display according to the present invention is formed at the outermost portion of the non-display area to seal the liquid crystal layer of the liquid crystal display device from the outside, and the display area and the non-display. A dam 140 is formed between the regions or inside the seal to reduce the flow of liquid crystal.

That is, the outermost edge of the liquid crystal display device is sealed by the seal 130. After the liquid crystal is injected into the liquid crystal layer through the seal inlet in the sealed state, the seal inlet is finally sealed, thereby completing the liquid crystal display device. Can be.

In addition, a dam is formed between the display area and the non-display area to prevent liquid crystals in the display area from flowing to the non-display area or to easily move the liquid crystals in the non-display area to the display area. A dam 140 may be formed at the front end of the seal 130 to prevent liquid crystals in the display area from flowing in the seal 130 to deform the seal.

Meanwhile, the present invention is characterized in that the second column spacer 150 as described above is formed in a triangular arrangement structure in the non-display area C. As shown in FIG. The column spacer 150 has a triangular or rhombus shape.

In this case, the triangular arrangement structure may be formed by forming a second column spacer on a central portion of four second column spacers forming a quadrangle.

In addition, the triangular shape may be an equilateral triangle, it may be an isosceles triangle.

When the second column spacer 150 is disposed in a triangular shape as described above, as shown in FIG. 6, even if a force G is applied to a position corresponding to L / 4 of the conventional liquid crystal display device, Since the distances of the two second column spacers 150 are shortened, the force distribution can be made even better.

That is, even if the non-display area to which the adhesive or adhesive tape is attached is disposed on the panel guide, and the force G is applied to the non-display area by the panel guide through the adhesive or the adhesive tape or the like, this force is more easily dispersed. Can be.

Accordingly, since the deformation of the non-display area of the liquid crystal display device is reduced and the phenomenon of lifting of the adhesive or the adhesive tape is also reduced, the light leakage phenomenon caused by the deformation of the non-display area in the conventional liquid crystal display device can be reduced.

In detail, the present invention has a structure in which a force applied to a liquid crystal display device can be dispersed by shortening the distance between the second column spacers formed in the non-display area, and as shown in FIG. 6, L / 4. Even when a force is applied to the point, compared with the conventional liquid crystal display device, since there is one second column spacer, the force received in the non-display area of the liquid crystal display device can be dispersed. For this reason, the present invention can prevent light leakage caused by deformation of the non-display area.

As described above, the present invention aims to improve light leakage by changing the arrangement of column spacers. To this end, the present invention provides the arrangement of a second column spacer formed in a non-display area in a conventional rectangular structure. Changed to triangular structure.

That is, when a borderless type is manufactured using a conventional liquid crystal display device in which a column structure (corresponding to the second column spacer of the present invention) formed in a non-display area has a quadrangular shape, a panel of the liquid crystal display device may be manufactured. An adhesive or an adhesive tape is attached to the part which contacts the panel guide part. In this case, since the force dispersion characteristic of the column spacer is poor, light leakage occurs in the outer portion (non-display area) of the conventional liquid crystal display device.

The present invention is to overcome such a defect, as described above, by changing the arrangement of the second column spacer 150 formed in the non-display area to a triangular form instead of a conventional square, so that the force distribution occurs efficiently can do. For this reason, the deformation of the shape does not occur in the non-display area of the liquid crystal display device according to the present invention, and therefore, the phenomenon that the adhesive or the adhesive tape is lifted does not occur. Therefore, light leakage may be reduced in the non-display area of the liquid crystal display according to the present invention.

This is because the pitch (distance) between the second column spacer and the second column spacer is shortened, thereby increasing the holding force against the force applied from the outside, which causes deformation of the thin film transistor substrate and the column spacer substrate. Because it does not.

Meanwhile, in the present invention, as shown in FIG. 5, not only the second column spacer 150 formed in the non-display area C, but also the first column spacer 160 formed in the display area D is also a triangle. By disposing in the form, it is possible to more efficiently disperse the force applied from the outside.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: color filter substrate 120: thin film transistor substrate
130: seal 140: dam
150: the second column spacer 160: the first column spacer
170: liquid crystal layer

Claims

A thin film transistor substrate comprising a display area including pixel areas formed by intersections of gate lines and data lines, and a non-display area formed outside the display area;
A color filter substrate on which color filters corresponding to the pixel regions are formed;
A liquid crystal layer formed between the thin film transistor substrate and the color filter substrate;
A plurality of first column spacers connected between the thin film transistor substrate and the color filter substrate to space the thin film transistor substrate from the color filter substrate at regular intervals in the display area; And
And a plurality of second column spacers disposed in a triangular shape on a portion of the color filter substrate corresponding to the non-display area.

The method of claim 1,
And the first column spacers and the second column spacers are in contact with both the thin film transistor substrate and the color filter substrate.

The method of claim 1,
The first column spacers and the second column spacers are formed on the color filter substrate.
The first column spacers are in contact with the protrusions formed on the thin film transistor substrate.
And the second column spacers have a predetermined distance from the thin film transistor substrate.

The method of claim 1,
And the first column spacers are arranged in a triangular shape in the display area.

The method of claim 1,
The triangular arrangement structure,
And another second column spacer is formed at a center portion of the four second column spacers forming a quadrangle.

The method of claim 1,
The triangular form is,
Liquid crystal display, characterized in that the equilateral triangle or isosceles triangle.

The method of claim 4, wherein
And the first column spacers are formed along the gate line.

The method of claim 1,
A seal formed at an outermost side of the non-display area to seal the liquid crystal layer from the outside; And
And a dam formed between the display area and the non-display area or inside the seal to reduce the flow of liquid crystal filled in the liquid crystal layer.