KR20170047769A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device for preventing damages of an alignment film and prevention of a defective spot in an opening area by using bumps having a double-groove structure.
A liquid crystal display device according to an embodiment of the present invention includes: a first substrate; A second substrate on which a black matrix for defining an opening region of the pixel is located; An alignment layer disposed between the first substrate and the second substrate; A spacer corresponding to the black matrix and disposed on either the first substrate or the second substrate; And a bump having a central portion accommodating one end of the spacer and a peripheral portion having a shallower depth than the central portion facing the spacer on a substrate different from the substrate on which the spacer is disposed, do.

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 including a bump of a double-groove structure.

The liquid crystal display (LCD) is suitable for a display device of a TV or a portable device due to the development of mass production technology, the ease of driving means, low power consumption, and high image quality. A liquid crystal display device displays an image according to a video signal by adjusting a transmittance of light passing through a liquid crystal layer of a pixel according to a video signal input from the outside.

FIG. 1 is a view showing a phenomenon in which damage and orientation of an alignment film are distorted due to flow of a spacer in a liquid crystal display device according to the related art.

1, a conventional liquid crystal display includes a first substrate 10 (a TFT array substrate), a second substrate 20 (a color filter substrate), a first substrate 10 and a second substrate 20 (not shown).

In the first substrate 10, a plurality of pixels are formed so that data lines and gate lines cross each other, and a thin film transistor (not shown), which is a switching device, is formed in a plurality of pixels.

A planarization layer (not shown) is formed to cover the thin film transistor. A first alignment layer 19 is formed on the planarization layer.

The second substrate 20 includes a black matrix 22, a second alignment film 25, and a spacer 30. The black matrix 22 is formed to correspond to the light shielding region, and the color filter is formed to correspond to the opening region.

The spacer 30 is formed in a region corresponding to the black matrix 22. The spacers 30 may maintain a cell gap between the first substrate 10 and the second substrate 20 or may maintain a gap between the first substrate 10 and the second substrate 20. The second alignment film 25 is formed to cover the spacer 30.

When an external force is applied to the liquid crystal display device, the second substrate 20 is moved, and the spacer 30 on the second substrate 20 is also moved. In addition, when the external force applied to the liquid crystal display device disappears, the second substrate 20 moves to the left and returns to the original position, and the spacer 30 formed on the second substrate 20 also moves to the original position .

The first alignment film 19 and the second alignment film 25 are oriented in a certain direction. At this time, the spacer 30 can move, and a region where the first alignment film 19 is in contact with the spacer 30 has a phenomenon in which the alignment direction thereof is changed. In addition, when the pressure is strongly applied, damage may occur to the first alignment film 19 as the spacer 30 moves, and the orientation of the alignment film is distorted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device in which damage to an alignment film due to the flow of a spacer is prevented.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device in which a defective spot on an opening area due to a foreign substance in an alignment film is prevented.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquid crystal display device including a first substrate, a second substrate on which a black matrix defining an opening area of a pixel is disposed, A spacer disposed on one of the first substrate and the second substrate and facing the spacer on a substrate different from the substrate on which the spacer is disposed, wherein the spacer is disposed between the substrate and the second substrate, And a bump having a recess formed of a peripheral portion that is shallower than the central portion.

According to another aspect of the present invention, the center portion receives the spacer so that the spacer does not move to the aperture region of the pixel due to an external force.

According to another aspect of the present invention, the peripheral portion prevents foreign matter generated in the alignment film from leaking out of the double groove due to friction between the bump and the spacer.

According to another aspect of the present invention, there is provided an alignment film comprising a first alignment film covering a bump and a second alignment film covering a spacer, wherein a first alignment film covering a central portion of the double groove and a second alignment film covering one end of the spacer are in contact with each other have.

According to another aspect of the present invention, the alignment layer includes a first alignment layer covering the bump and a second alignment layer covering the spacer, wherein the first alignment layer covering the central portion of the double groove and the second alignment layer covering one end of the spacer are spaced apart from each other have.

According to another aspect of the present invention, the second substrate is a color filter substrate including red, green, and blue pixels, and the spacer is a red pixel and a green pixel, or a red pixel and a blue pixel Corresponding to the black matrix.

According to another aspect of the present invention, the bump is provided to prevent the spacer from moving to the opening region of the red pixel to damage the alignment film.

According to another aspect of the present invention, the bump is in the shape of a cylinder, a quadrangular column or a conical column, and the width of the peripheral portion is wider than the maximum width of the spacer.

According to another aspect of the present invention, the width of the bump is narrower than the width of the black matrix.

According to another aspect of the present invention, the bump is a single layer or multilayer structure of an organic film or an inorganic film.

A liquid crystal display panel according to another embodiment of the present invention includes a TFT substrate, a color filter substrate opposed to the TFT substrate, a double-role member disposed on the TFT substrate and covering the alignment layer, The double role member minimizes the flow of the spacer and is provided so that the foreign matter generated in the orientation layer by the flow of the spacer does not leak out of the double role member.

According to another aspect of the present invention, the double role member is characterized in that the surface facing the spacer is recessed in a step-like structure.

According to another aspect of the present invention, the step-like structure is composed of a central portion of the circular shape and a peripheral portion surrounding the central portion, and the central portion is deeper than the peripheral portion.

According to another aspect of the present invention, the spacer is located at the center of the stair-like structure so that the flow is minimized.

A structure according to another embodiment of the present invention includes a bumper array in a second substrate corresponding to a spacer array and a first substrate in a first substrate and the spacer array and the bump array Each spacer having a height and shape that maintains a cell-gap with respect to the first substrate and the second substrate, each bump receiving a corresponding spacer to prevent separation And is characterized by having a basin shape suitable for the following.

According to another aspect of the present invention, a liquid crystal display device further includes a first alignment film covering the spacer array and a second alignment film covering the bump array.

According to another aspect of the present invention, the bifurcated shape of each bump includes a foreign material receiving gap, and accommodates a foreign substance of the first orientation film or the second orientation film generated by contact friction between the bump and the spacer.

According to another aspect of the present invention, the branch has an inner wall in the form of a double step, and a space between the inner wall and the spacer accommodated in the branch is a foreign material receiving gap.

According to another aspect of the present invention, the branch is characterized by being one of circular, elliptical, and rhombic shapes when the second substrate is viewed vertically.

According to another aspect of the present invention, the first substrate is a color filter (CF) substrate and the second substrate is a thin film transistor (TFT) substrate, and the spacer array and the bump array are applied to a display device.

According to the embodiment of the present invention, the bumps having the double grooves minimize the flow of the spacers, thereby preventing scratches on the orientation film. [0043] Further, according to the embodiment of the present invention, Foreign matter generated in the alignment layer is prevented from leaking to the outside, and occurrence of a defective spot in the opening area due to foreign substances in the alignment layer can be minimized.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

FIG. 1 is a view showing a phenomenon in which damage and orientation of an alignment film are distorted due to flow of a spacer in a liquid crystal display device according to the related art.
2 is a plan view of a liquid crystal display according to an embodiment of the present invention.
FIG. 3A is a sectional view taken along the line A1-A2 shown in FIG. 2, and FIG. 3B is a sectional view taken along line B1-B2 shown in FIG.
4 is a cross-sectional view showing a bump formed by a single layer structure of an inorganic film or an organic film.
5 is a cross-sectional view showing a bump formed in a multilayer structure in which a plurality of inorganic films are stacked.
6 is a cross-sectional view showing a bump formed in a multilayer structure in which a plurality of organic films are stacked.
7 and 8 are cross-sectional views showing bumps formed in a multilayer structure in which an inorganic film and an organic film are laminated.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to 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 concept of the invention to those skilled in the art. To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Where the terms "comprises," "having," "consisting of," and the like are used in this specification, other portions may be added as long as "only" is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The terms "X-axis direction "," Y-axis direction ", and "Z-axis direction" should not be construed solely by the geometric relationship in which the relationship between them is vertical, It may mean having directionality.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, May refer to any combination of items that may be presented from more than one.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

A liquid crystal display device includes an alignment film for aligning a liquid crystal. When an external force is applied to the liquid crystal display device, the spacer can move. The spacer can damage the alignment film while moving. The damaged alignment film may become a foreign object and leak into the opening area of the pixel. Therefore, defective spot defects may occur in which the opening areas of the pixels are blurred.

In addition, when the alignment film is damaged, the alignment direction of the alignment film may be distorted. At this time, the liquid crystal molecules are arranged in different directions, and the transmittance of light may be changed. Therefore, the area where the damage is caused by the contact with the alignment film as the spacer moves is not covered with the black matrix, so that defects of the light may occur.

It is necessary to expand the area of the black matrix to the region in which the spacer flows and the orientation of the alignment film is distorted and the region where the alignment film may be damaged in order to prevent defective spot defects and defects in the light spot. However, if the area of the black matrix is enlarged, the aperture ratio of the pixel becomes lower. That is, although the defective spot defect and the light spot defect can be improved by enlarging the area of the black matrix, the aperture ratio of the pixel may be reduced.

Further, the area of the black matrix of the portion where the spacer is formed and the area of the black matrix of the portion where the spacer is not formed may be asymmetric. As a result, there arises another problem that a difference in transmittance occurs in each pixel and a color difference occurs.

In order to solve such a problem, if the area of the entire black matrix is made wider, the color difference can be improved, but the transmittance of all the pixels is reduced. Particularly, the size of a pixel becomes smaller as it goes to a high-resolution model. However, if the area of the black matrix is enlarged in order to prevent a defect in a bright spot and a defect in a light spot, a transmittance of a pixel may be drastically reduced.

The inventors of the present invention have thus realized a new structure of a liquid crystal display device capable of recognizing such a problem, preventing a defective spot and a defective spot, and increasing the aperture ratio of the pixel.

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

2 is a cross-sectional view taken along the line A1-A2 shown in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line B1-B2 shown in FIG. 2; to be. The structure of the liquid crystal display device will be described with reference to a plan view and a cross-sectional view of the liquid crystal display device.

Figs. 3A and 3B show a part of a plurality of pixels of the liquid crystal display device of the present invention, and show one of a plurality of gap spacers and a plurality of padding spaces.

2, 3A and 3B, a liquid crystal display includes a first substrate 100 (a TFT substrate), a second substrate 200 (a color filter substrate), a first substrate 100, (Not shown) between the liquid crystal layer 200 and the liquid crystal layer.

The first substrate 100 includes a thin film transistor 110, a planarization layer 130, an electrode 150, a protective layer 170, a bump 400, and a first alignment layer 190.

The first substrate 100 includes a plurality of data lines and a plurality of gate lines. A plurality of data lines and a plurality of gate lines may intersect with each other. A thin film transistor (TFT) 110 as a switching element is formed in each pixel region, and a pixel electrode is formed over the pixel region. The thin film transistor 110 includes a gate electrode, an active layer, a source electrode, and a drain electrode. At this time, the active layer between the source electrode and the drain electrode becomes the channel of the thin film transistor 110.

The planarization layer 130 is located on the thin film transistor 110. The planarization layer 130 is formed to cover the thin film transistor. At this time, the planarization layer 130 may planarize the first substrate 100 to remove a step on the surface of the first substrate 100 due to the thin film transistor 110. The planarization layer 130 may be formed by, for example, applying a photo acrylic to the entire surface of the substrate, but is not limited thereto.

The electrode 150 is located on the planarization layer 130. The electrode 150 supplies a voltage to the pixel. At this time, a common electrode may be formed to supply the common voltage Vcom. The common electrode may be formed on the entire surface of the first substrate 100. In the present invention, the electrode 150 has been described as a common electrode, but it may also be formed as a pattern electrode. The electrode 150 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto.

The protective film 170 is located on the electrode 150. The protective film 170 is formed to cover the electrode 150. The protective film 170 may be formed of an inorganic film, for example, as a silicon oxide (SiO2) or a silicon nitride (SiNx) material, but is not limited thereto. In addition, the protective film 170 may be formed of an organic material as well as an inorganic material.

Although not shown in the drawing, a pixel electrode is formed on the passivation layer 170 of the pixel region, and the pixel electrode is electrically connected to the drain of the TFT 110.

The bumps 400 (or dual role members) are located on the protective film 170. The bumps 400 may be formed in the form of an array. At this time, the bump 400 may be formed to overlap with the thin film transistor 110. At this time, the bumps 400 may be formed in a basin shape having a double recess therein. At this time, the double groove is composed of the center portion and the peripheral portion. The center of the double groove is deeper than the peripheral portion. The peripheral part of the double groove is shallower than the center part. That is, the branched shape with the double grooves is a concave structure with a double stepped inner wall. Thus, the step-like structure is composed of a central portion of the circular shape and a peripheral portion surrounding the central portion.

The center of the double groove receives one end of the spacers 300 and 310. Therefore, when an external force is applied to the liquid crystal display device, the center portion of the double groove can accommodate the spacers 300 and 310 so that the spacers 300 and 310 do not move to the opening regions of the pixels. That is, the branch shape with the double grooves may be adapted to accommodate the spacers 300, 310 to prevent spacing of the spacers 300, 310.

The peripheral portion of the double groove has a space (or a foreign material receiving gap). Therefore, when an external force is applied to the liquid crystal display device, the peripheral portion of the double groove is filled with foreign matter generated in the alignment films 190 and 250 due to friction between the bump 400 and the spacers 300 and 310 due to the movement of the spacer, It can be prevented from leaking to the outside. That is, the foreign material receiving gap in the branch shape of the bump 400 can accommodate the foreign substance of the alignment film 190.250 generated by the contact friction between the bump 400 and the spacers 300 and 310.

The bump 400 with a double groove may be, for example, a cylindrical shape, a square pillar, or a conical pillar shape. The width of the lower end portion of the bump 400 contacting the protection film 170 is larger than the width of the upper end portion of the bump 400. Also, when the bifurcated shape of the bump 400 is viewed perpendicularly to the substrate, it can be one of circular, elliptical, and rhombic shapes.

Such bump 400 with a double groove may be formed simultaneously with a single mask process using a multitone mask.

A first alignment layer 190 is located on the protective film 170 and the bump 400. At this time, the first alignment layer 190 covers the protective layer 170 and the bump 400. At this time, the first alignment layer 190 covers the central portion and the peripheral portion of the double groove.

The first alignment layer 190 aligns the liquid crystal of the liquid crystal layer in a predetermined direction. The first alignment layer 190 may be formed of, for example, polyimide (PI), but is not limited thereto.

The second substrate 200 includes a black matrix 220, a color filter 210, an overcoat layer 230, spacers 300 and 310, and a second alignment layer 250.

The black matrix 220 is located on one side of the second substrate 200 facing the first substrate 100. At this time, the black matrix 220 defines an aperture area of the pixel. The aperture region means an area where light is transmitted and an image is displayed. Accordingly, the black matrix 220 is formed to correspond to the shielding area. The light shielding region means a region where light is not transmitted.

The color filter 210 is formed to correspond to the opening region of the pixel. The color filter 210 is formed by selectively applying and removing red, green, and blue color pigments for displaying color images using a mask.

The overcoat layer 230 is formed on the black matrix 220 and the color filter 210. At this time, the overcoat layer 230 covers the black matrix 220 and the color filter 210. On the overcoat layer 230, spacers 300 and 310 are positioned in a region corresponding to the black matrix 220.

Spacers 300 and 310 include gap spacers 300 or push spacers 310. The spacers 300 and 310 may have a height and a shape that maintain a cell-gap with respect to the first substrate 100 and the second substrate 200. At this time, one end of the spacers 300 and 310 is accommodated in the center of the bump 400. The spacers 300 and 310 may be in the form of an array.

As shown in FIG. 3A, a gap spacer 300 is formed in the second substrate 200.

The gap spacers 300 disposed on the second substrate 200 are positioned to correspond to the bumps 400 on the first substrate 100. At this time, the bump 400 faces the gap spacer 300. One end of the gap spacer 300 may be located inside the double groove of the bump 400 having the double groove. At this time, one end of the gap spacer 300 may be accommodated in the center of the double groove. Thus, the gap spacers 300 can be tied to the bumps 400. Accordingly, the gap spacer 300 can maintain a cell gap between the first substrate 100 and the second substrate 200 together with the bumps 400.

The gap spacer 300 may be, for example, a cylindrical shape or a conical shape, but is not limited thereto. The width of the upper end of the gap spacer 300 in contact with the overcoat layer 230 is wider than the width of the lower end of the gap spacer 300.

A second alignment layer 250 is positioned on gap spacer 300 and overcoat layer 230. At this time, the second alignment layer 250 covers the gap spacer 300 and the overcoat layer 230. At this time, the second alignment layer 250 covers one end of the gap spacer 300. Therefore, the second alignment layer 250 is in contact with the first alignment layer 190 covering the central portion of the double groove of the bump 400.

The second alignment layer 250 aligns the liquid crystal of the liquid crystal layer in a predetermined direction. The second alignment layer 250 may be formed of, for example, polyimide (PI), but is not limited thereto.

As shown in FIG. 3B, the pressed spacers 310 are formed on the second substrate 200.

The pressed spacers 310 disposed on the second substrate 200 are positioned to correspond to the bumps 400 on the first substrate 100. At this time, the bump 400 faces the pressing spatter 310. One end of the pressing spacer 310 may be located inside the double groove of the bump 400 having the double groove. At this time, one end of the pressing spacer 310 may be received in the center of the double groove. Further, there may be a space (or a foreign material receiving gap) between the pressed spacer 310 and the center of the double groove. Thus, the bump 400 can minimize the flow of the pushing spacer 310. Accordingly, the pressed spacers 310 can maintain a push gap between the first substrate 100 and the second substrate 200 together with the bumps 400.

The pressing spacers 310 may be, for example, cylindrical or conical in shape, but are not limited thereto. The width of the upper end of the pressed spacer 310 in contact with the overcoat layer 230 is wider than the width of the lower end of the gap spacer 300.

The upper and lower ends of the pressing spacers 310 may be formed to have the same width as the gap spacers 300. However, the present invention is not limited thereto. The upper and lower ends of the pressed spacer 310 may be formed to have a narrower width than the gap spacer 300.

A second alignment layer (250) is located on the overlay layer (230) and the overlaying spacer (310). At this time, the second alignment layer 250 covers the pressure-sensitive spacer 310 and the overcoat layer 230. At this time, the second alignment layer 250 covers one end of the gap spacer 300. At this time, there may be a space (or a foreign material receiving gap) between the pressed spacer 310 and the central portion of the double groove of the bump 400. Accordingly, the second alignment layer 250 is spaced apart from the second alignment layer 250 covering the central portion of the double groove of the bumps 400.

The second alignment layer 250 aligns the liquid crystal of the liquid crystal layer in a predetermined direction. The second alignment layer 250 may be formed of, for example, polyimide (PI), but is not limited thereto.

The image display device forms a liquid crystal layer (not shown) between the first substrate 100 and the second substrate 200.

The gap spacer 300 and the pressing spacer 310 are arranged to correspond to the bumps 400 of the first substrate 100. [ At this time, the surface of the first substrate 100 protrudes along the profile of the bump 400 formed on the first substrate 100. The gap spacer 300 is formed in a region corresponding to the bump 400 to maintain a cell gap between the first substrate 100 and the second substrate 200. At this time, the width of the upper end of the gap spacer 300 contacting the overcoat layer 230 is formed to be narrower than the width of the peripheral portion of the double groove of the bump 400. That is, the width of the peripheral portion of the double groove of the bump 400 is formed to be wider than the maximum width of the gap spacer 300.

The pressed spacers 310 are formed at a lower height than the gap spacers 300. The pressed spacer 310 is formed in a region corresponding to the bump 400 to maintain a push gap between the first substrate 100 and the second substrate 200. At this time, the pressing gap means a space between the pressing spacer 310 and the bump 400. At this time, the width of the upper end of the pressed spacer 310 contacting the overcoat layer 230 is narrower than the width of the peripheral portion of the double groove of the bump 400. That is, the width of the peripheral portion of the double groove of the bump 400 is formed to be wider than the maximum width of the pressed spacer 310.

There is a space between the pressed spacer 310 and the bump 400. That is, there is a pressing gap between the pressed spacer 310 and the bump 400. The pressing gap serves to prevent the substrate from being pushed when an external force is applied to the liquid crystal display device to prevent the liquid crystal display device from being broken. The pressing gap may be, for example, a gap of about 5,000 to 6,000 angstroms, but is not limited thereto.

The gap spacer 300 and the pressing spacer 310 are arranged to correspond to the black matrix 220 of the second substrate 200.

At this time, the gap spacer 300 and the pressed spacer 310 may be arranged corresponding to the black matrix 220 between the red pixel and the blue pixel. Accordingly, the gap spacer 300 and the pressing spacer 310 can be disposed corresponding to the light shielding region between the red pixel and the blue pixel. The gap spacer 300 and the pressed spacer 310 may be arranged corresponding to the black matrix 220 between the red pixel and the green pixel. Therefore, the gap spacer 300 and the pressed spacer 310 may be disposed corresponding to the light shielding region between the red pixel and the green pixel. The bumps 400 disposed on the first substrate 100 corresponding to the gap spacers 300 and the pressing spacers 310 can be prevented from moving the spacers 300 and 310 to the opening regions of the red pixels . Therefore, the bump 400 can prevent the defects of the light scattering caused by the damage of the alignment films 190 and 250 by the spacers 300 and 310. The bump 400 has a branched shape with a double groove. The double groove is composed of a central portion and a peripheral portion.

The center of the double groove is deeper than the peripheral portion. That is, the peripheral portion of the double groove is shallower than the central portion. The gap spacer 300 and the compression spacer 310 may be located at the center of the double groove of the bump 400. At this time, the center of the double groove receives one end of the gap spacer 300 and the pressing spacer 310. Therefore, when an external force is applied to the liquid crystal display device, the center portion of the double groove can prevent the gap spacer 300 and the pressing spacer 310 from moving to the opening region of the pixel. I.e., minimizing the flow of the gap spacer 300 and the pushing spacer 310, can be accommodated.

The peripheral portion of the double groove has a space. Here, the space means a space between the gap spacer 300 and the periphery of the double groove or a space between the pressing spacer 310 and the periphery of the double groove. That is, the bump 400 may have a space inside. When an external force is applied to the liquid crystal display device, the gap spacer 300 and the pressing spacer 310 can be moved. At this time, the alignment layers 190 and 250 located between the first substrate 100 and the second substrate 200 may be damaged. Therefore, a part of the alignment film may be separated by friction between the bump 400 and the spacers 300 and 310, and foreign matter may be generated. The foreign matter generated at this time can be stacked in a space in the periphery of the double groove of the bump 400. Thus, foreign matter can be prevented from leaking to the outside of the double groove. That is, the peripheral portion of the double groove can be prevented from leaking out of the double groove due to the friction with the bump 400 due to the movement of the gap spacer 300 and the pressing spacer 310. As a result, defective defects in which the opening areas of the pixels due to the foreign substances in the alignment films 190 and 250 are visible can be prevented.

That is, when an external force is applied to the liquid crystal display device, the bump 400 receives the spacers 300 and 310 so that the spacers 300 and 310 do not move to the opening regions of the pixels, It is possible to prevent leakage to the outside of the double groove of the bump 400.

Further, the distance between the gap spacer 300 and the first alignment film 190 and the distance between the pressing spacer 310 and the first alignment film 190 are distanced by the bumps 400. Therefore, even if the gap spacer 300 and the pressing spacer 310 are moved by the external force, the gap spacer 300 and the pressing spacer 310 can minimize the contact of the opening region with the first alignment film 190. Accordingly, the alignment direction of the first alignment layer 190 may be distorted or the damage of the first alignment layer 190 may be minimized. Thus, defects in the light scattering in the aperture region of the pixel can be prevented.

The bump 400 and the spacers 300 and 310 described in the embodiment of the present invention can be displaced from each other. That is, the spacers 300 and 310 may be formed on the first substrate 100, and the bumps 400 may be formed on the second substrate 200.

4 is a cross-sectional view showing a bump formed by a single layer structure of an inorganic film or an organic film.

As shown in FIG. 4A, the bump 400 may be formed of one inorganic film using an inorganic material as a material. Alternatively, as shown in FIG. 4B, the bump 400 may be formed of one organic film using an organic material as a material.

5 is a cross-sectional view showing a bump formed in a multilayer structure in which a plurality of inorganic films are stacked.

As shown in FIG. 5, the bumps 400 may be formed in a multi-layer structure in which a plurality of inorganic films are stacked. At this time, the materials of the first inorganic film 401c, the second inorganic film 401b, and the third inorganic film 401a may be the same. However, the present invention is not limited to this, and materials of the first inorganic film, the second inorganic film 401b, and the third inorganic film 401a may be different.

The first inorganic film 401c and the second inorganic film 401b may be formed of the same thickness or different thickness. The third inorganic film 401a has a double groove. Therefore, the third inorganic film 401a may be formed with a different thickness from the first inorganic film 401c and the second inorganic film 401b. At this time, the third inorganic film 401a may be formed by a single mask process using a multitone mask.

When the bumps 400 are formed into a multilayer structure in which a plurality of inorganic films are stacked, the bumps 400 can be formed thick. In addition, if the bumps 400 are formed in a multi-layer structure in which a plurality of inorganic films are stacked, the bumps 400 can be precisely adjusted.

6 is a cross-sectional view showing a bump formed in a multilayer structure in which a plurality of organic films are stacked.

As shown in FIG. 6, the bumps 400 may be formed in a multi-layer structure in which a plurality of organic films are stacked. At this time, the materials of the first organic layer 402c, the second organic layer 402b, and the third organic layer 402a may be the same. However, the present invention is not limited to this, and materials of the first organic film 402c, the second organic film 402b, and the third organic film 402a may be different.

The first organic film 402c and the second organic film 402b may be formed of the same or different shapes. The third organic film 402a has a double groove. Accordingly, the third organic layer 402a may be formed of a different material from the first organic layer 402c and the second organic layer 402b. At this time, the third organic layer 402a may be formed by a single mask process using a multitone mask.

When the bumps 400 are formed into a multilayer structure in which a plurality of organic films are stacked, the bumps 400 can be formed thick. Further, if the bumps 400 are formed in a multi-layer structure in which a plurality of organic films are stacked, the bumps 400 can be precisely adjusted.

7 and 8 are cross-sectional views showing bumps formed in a multilayer structure in which an inorganic film and an organic film are laminated.

7, the bumps 400 may be formed in a multi-layer structure in which a plurality of inorganic films 403 and 405 and one organic film 404 are stacked. Layer structure in which an organic film 404 is formed between the first inorganic film 405 and the second inorganic film 403. The first inorganic film 405 and the second inorganic film 403 may be formed of the same material. However, the present invention is not limited to this, and the materials of the first inorganic film 405 and the second inorganic film 403 may be different.

The first inorganic film 405 and the organic film 404 may be formed with the same thickness or different thickness. The second inorganic film 403 has a double groove. Therefore, the second inorganic film 403 may be formed of a different thickness from the first inorganic film 405 and the organic film 404. At this time, the second inorganic film 403 may be formed by a single mask process using a multitone mask.

When the bump 400 is formed in a multilayer structure in which the organic film 404 is formed between the first inorganic film 405 and the second inorganic film 403 as described above, the bump 400 can be formed thick. When the bumps 400 are formed in a multi-layer structure in which the organic film 404 is formed between the first inorganic film 405 and the second inorganic film 403, the bumps 400 can be precisely adjusted .

As shown in FIG. 8, the bump 400 may be formed in a multi-layer structure in which a plurality of organic films 406 and 408 and an inorganic film 407 are stacked. Layer structure in which an inorganic film 407 is formed between the first organic film 408 and the second organic film 406. The first organic layer 408 and the second organic layer 406 may be formed of the same material. However, the present invention is not limited to this, and materials of the first organic film 408 and the second organic film 406 may be different.

The first organic film 408 and the inorganic film 407 may be formed of the same or different shapes. The second organic film 406 has a double groove. Accordingly, the second organic film 406 may be formed of a different thickness from the first organic film 408 and the inorganic film 407. At this time, the second organic layer 406 may be formed by a single mask process using a multitone mask.

When the bumps 400 are formed in a multi-layer structure in which the inorganic film 407 is formed between the first organic film 408 and the second organic film 406, the bumps 400 can be formed thick. In addition, if the bumps 400 are formed in a multi-layer structure in which an inorganic film is formed between the first organic film 408 and the second organic film 406, the bumps 400 can be precisely adjusted.

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.

100: first substrate
110: thin film transistor
130: planarization layer
150: electrode
170: Shield
190: first alignment film
200: second substrate
210: Color filter
220: Black Matrix
230: Overcoat layer
250: second alignment film
300: gap spacer
310:
400: Bump

Claims (20)

A first substrate;
A second substrate on which a black matrix defining an opening region of the pixel is disposed;
An alignment layer disposed between the first substrate and the second substrate;
A spacer corresponding to the black matrix and disposed on one of the first substrate and the second substrate; And
And a bump having a recess facing the spacer on a substrate different from the substrate on which the spacer is disposed and having a central portion receiving one end of the spacer and a peripheral portion shallower than the central portion, Liquid crystal display device. The method according to claim 1,
And the central portion receives the spacer so that the spacer does not move to the opening region of the pixel by an external force. The method according to claim 1,
Wherein the peripheral portion prevents foreign matter generated in the alignment film from leaking out of the double groove due to friction between the bump and the spacer. The method according to claim 1,
Wherein the alignment film includes a first alignment film that covers the bumps and a second alignment film that covers the spacer,
Wherein a first alignment layer covering the central portion of the double groove and a second alignment layer covering one end of the spacer are in contact with each other. The method according to claim 1,
Wherein the alignment layer comprises a first alignment layer covering the bumps and a second alignment layer covering the spacer,
Wherein the first alignment layer covering the central portion of the double groove and the second alignment layer covering one end of the spacer are spaced apart from each other. The method according to claim 1,
Wherein the second substrate is a color filter substrate including red, green, and blue pixels,
Wherein the spacer corresponds to the red pixel and the green pixel or a black matrix between the red pixel and the blue pixel. The method according to claim 6,
Wherein the bump prevents the spacer from moving to the opening region of the red pixel to damage the alignment layer. The method according to claim 1,
The bumps may be cylindrical, rectangular, or conical,
Wherein a width of the peripheral portion is larger than a maximum width of the spacer. 9. The method of claim 8,
Wherein a width of the bump is narrower than a width of the black matrix. The method according to claim 1,
Wherein the bump is a single layer or a multilayer structure of an organic film or an inorganic film. A TFT substrate;
A color filter substrate facing the TFT substrate;
A dual role member positioned on the TFT substrate and covering the orientation layer; And
And a spacer located on the orientation layer and facing the dual role member,
Wherein the double role member minimizes the flow of the spacer and prevents foreign matter generated in the orientation layer from leaking out of the double role member due to the flow of the spacer. 12. The method of claim 11,
Wherein the double-role member is recessed in a step-like structure on a surface facing the spacer. 13. The method of claim 12,
Wherein the step-like structure comprises a central portion of a circular shape and a peripheral portion surrounding the central portion,
Wherein the central portion is deeper than the peripheral portion. 14. The method of claim 13,
Wherein the spacers are positioned at the center of the step-like structure to minimize the flow of liquid. A spacer array on the first substrate; And
A bump array in a second substrate corresponding to the first substrate,
Wherein the spacer array and the bump array have opposite positions facing each other,
Each of the spacers has a height and a shape that maintains a cell-gap with respect to the first substrate and the second substrate,
Each bump having a basin shape adapted to receive the spacer and prevent separation therefrom. 16. The method of claim 15,
A first alignment layer covering the spacer array and a second alignment layer covering the bump array. 17. The method of claim 16,
Wherein the branch shape of each of the bumps has a foreign material receiving gap to accommodate foreign substances of the first alignment film or the second alignment film generated by contact friction between the bump and the spacer. 18. The method of claim 17,
Wherein the branch has an inner wall in the form of a double step, and the space between the inner wall and the spacer received in the branch is the foreign material receiving gap. 19. The method of claim 18,
Wherein the branch is one of a circular, elliptical, and rhombic shape when the second substrate is viewed vertically. 20. The method of claim 19,
Wherein the first substrate is a color filter (CF) substrate and the second substrate is a thin film transistor (TFT) substrate, wherein the spacer array and the bump array are applied to a display device.

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