KR20170044327A

KR20170044327A - Liquid crystal display apparatus

Info

Publication number: KR20170044327A
Application number: KR1020150143873A
Authority: KR
Inventors: 김승기
Original assignee: 엘지디스플레이 주식회사
Priority date: 2015-10-15
Filing date: 2015-10-15
Publication date: 2017-04-25

Abstract

A liquid crystal display device according to an embodiment of the present invention includes a liquid crystal layer in a display region between a first substrate and a second substrate, a common electrode for driving the liquid crystal layer on the first substrate, A sealant surrounding the liquid crystal layer in the non-display area between the second substrate and the non-display area between the liquid crystal layer and the sealant, A compensation layer superimposed on the one dam column spacer and the at least one dam column spacer and configured to have a thickness that maintains a gap between the first substrate and the second substrate while lowering the resistance of the common electrode, . Accordingly, the display quality and driving efficiency of the liquid crystal display device can be improved.

Description

[0001] LIQUID CRYSTAL DISPLAY APPARATUS [0002]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a display quality and a driving efficiency improved by forming a compensation layer overlapping a dam column spacer to maintain a cell gap of a non- .

2. Description of the Related Art [0002] A display apparatus is a device for displaying an image. As an information society develops, demands for a display device have been developed in various forms. Various devices such as a television, a mobile device, a notebook, Research is being continuously carried out to make it available.

One of the display devices, a liquid crystal display apparatus (LCD), is driven by the principle of image realization by the optical anisotropy and polarization of liquid crystal.

A liquid crystal display device generally has a structure in which a lower substrate including a thin film transistor and an electrode, and an upper substrate including a color filter and a black matrix are disposed to face each other, and a liquid crystal layer is interposed between the two substrates. A sealant for preventing the liquid crystal layer from leaking to the outside and for adhering the two substrates is disposed in the outer region between the two substrates so as to surround the liquid crystal layer. In addition, a plurality of columnar spacers for arranging a liquid crystal injection space are disposed between the two substrates while maintaining a cell gap between the two substrates. Here, the cell gap refers to the spacing of the spaces filled with the liquid crystal between the two substrates after the lower substrate and the upper substrate are laminated, and the spacing between the two substrates is maintained constant by the plurality of column spacers So that the liquid crystal injection space can be sufficiently secured.

In particular, the plurality of spacers may include a gap column spacer and a push column spacer. The gap column spacer serves to maintain a constant gap between the lower substrate and the upper substrate. The push column spacer has a lower height than the gap column spacer and serves to disperse the pressure that can be concentrated in the gap column spacer when an external force is applied.

Meanwhile, the liquid crystal display device may further include a dam column spacer between the sealant and the liquid crystal layer. The dam column spacer maintains the cell gap in the outer region of the lower substrate and the upper substrate, and functions to suppress the liquid crystal layer from moving to the sealant. Specifically, when a part of the liquid crystal layer expands due to heat to lose its orientation property in a high temperature environment, or when the liquid crystal layer moves out of the display area and moves in the sealant direction due to external force, adhesion failure between the two substrates may occur. In addition, the amount of the liquid crystal layer in the display area is insufficient, and mura defects due to uncharged liquid crystal may occur. The dam column spacer is disposed between the liquid crystal layer and the sealant to suppress undesired movement of the liquid crystal layer in the sealant direction, so that the above-described adhesion failure and stain defect can be reduced. The dam column spacer can be formed through the same process at the same height as the gap column spacer or the push column spacer disposed in the display area, according to the design of the liquid crystal display device.

The problem is that it is very difficult to organically change or adjust the height of the dam column spacers to determine the cell gap in the outer region between the two substrates as the process environment or design changes. For example, even if the dam column spacers are initially designed at the same height as the push column spacers, the height of the dam column spacers can be formed to be lower than the target value in the process of optimizing the process of other elements such as thin film transistors and the like. Alternatively, when the lamination structure of the components contained in the lower substrate or the upper substrate is changed so that the distance between the two substrates in the outer area is increased, the distance between the two substrates in the outer area is smaller than the initial designed May be greater than the height.

In such a case, since the cell gap in the outer area is not properly maintained, the transmittance variation may occur due to the deviation of the cell gap, and the display quality of the liquid crystal display device may be deteriorated. Specifically, a portion having a low cell gap between two substrates may have a reduced transmittance of light having a longer wavelength as compared with a portion having a higher cell gap, or the brightness may be lowered or the bluish light may be bluish. This may cause a mura defect in a part of the liquid crystal display device, leading to a problem that the display quality of the liquid crystal display device is deteriorated.

In general, since a plurality of column spacers are formed through a mask process, it is necessary to redesign the mask in order to change the height of the dam column spacer to the above-mentioned process environment or design variation, The productivity of the liquid crystal display device can be greatly reduced.

The inventors of the present invention have found that by additionally providing a compensation layer disposed between two substrates in contact with a common electrode and arranged to overlap with a dam column spacer, A new structure of a liquid crystal display device capable of organically changing or adjusting a cell gap in an outer region between two substrates according to a design variation and reducing a resistance of a common electrode is also invented.

The problem to be solved according to an embodiment of the present invention is to provide a non-display portion in which a compensation layer disposed to overlap with a dam column spacer in contact with a common electrode is formed, And to provide a liquid crystal display device in which a cell gap of a display portion is maintained and display quality is improved.

Another object of the present invention is to provide a liquid crystal display device in which the resistance of the common electrode is reduced and the driving efficiency is improved by constructing the compensation layer disposed in the non-display portion so as to be in contact with the common electrode and overlapping the dam column spacer .

Another object of the present invention is to provide an in-cell touch device which is made of the same material as that of the compensation layer in the display portion and which is in contact with the common electrode and constitutes a metal layer functioning as a touch sensing electrode, And to provide a liquid crystal display device capable of realizing a liquid crystal display device.

The solutions according to one embodiment 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 embodiment of the present invention, there is provided a liquid crystal display including a display portion and a non-display portion surrounding the display portion, wherein the display portion includes a planarization layer on the first substrate, a first common electrode on the planarization layer, A metal layer in contact with the first common electrode, an alignment layer covering the metal layer, a gap column spacer on the alignment layer, and a push column spacer spaced apart from the gap column spacer. Wherein the non-display portion includes: a planarization layer extending from the display portion, a second common electrode electrically insulated from the first common electrode on the planarization layer, a second common electrode electrically connected to the first common electrode, A dam column spacer extending from the display unit and covering the compensation layer, a dam column spacer superimposed on the compensation layer on the alignment layer, and a sealant surrounding the display unit on the planarization layer. . According to one embodiment of the present invention, the non-display portion of the liquid crystal display device includes the compensation layer overlapping the dam column spacer and in contact with the common electrode, thereby lowering the resistance of the common electrode to improve the driving efficiency of the liquid crystal display device , The display quality of the liquid crystal display can be improved by keeping the cell gap of the non-display portion constant, without changing the height of the dam column spacer through the mask redesign in process or design variation.

In the liquid crystal display device according to an embodiment of the present invention, the display unit may further include a liquid crystal layer, and the dam column spacer may be disposed so as to surround the display unit such that the liquid crystal layer is prevented from moving to the sealant. have.

In the liquid crystal display device according to an embodiment of the present invention, the compensation layer may have a thickness that maintains a cell gap of the non-display portion.

In the liquid crystal display device according to an embodiment of the present invention, the thickness of the compensation layer may be equal to or greater than a height difference between the gap column spacer and the push column spacer.

In the liquid crystal display device according to an embodiment of the present invention, the metal layer may function as a touch sensing electrode.

In the liquid crystal display device according to an embodiment of the present invention, the width of the compensation layer may be larger than the width of the dam column spacer.

In the liquid crystal display device according to an embodiment of the present invention, the dam column spacer may include a first dam column spacer surrounding the display portion and a second dam column spacer surrounding the first dam column spacer have.

In the liquid crystal display device according to an embodiment of the present invention, the compensation layer may be disposed to overlap with both the first dam column spacer and the second dam column spacer.

In the liquid crystal display according to an embodiment of the present invention, the compensation layer may include a first compensation layer superimposed on the first dam column spacer, and a second compensating layer overlapping the second dam column spacer, And a second compensating layer spaced apart.

In the liquid crystal display device according to an embodiment of the present invention, the dam column spacer may have at least one opening in an edge area.

In the liquid crystal display device according to an embodiment of the present invention, the compensation layer may be configured to completely surround the display portion.

According to another embodiment of the present invention, there is provided a liquid crystal display comprising a liquid crystal layer in a display region between a first substrate and a second substrate, a common electrode for driving the liquid crystal layer on the first substrate, And a sealant surrounding the liquid crystal layer in the non-display area between the liquid crystal layer and the sealant, and suppressing movement of the liquid crystal layer to the sealant in the non-display area between the liquid crystal layer and the sealant At least one dam column spacer and at least one dam column spacer, the compensation layer being configured to have a thickness that reduces the resistance of the common electrode while maintaining a gap between the first substrate and the second substrate, . Accordingly, the display quality and driving efficiency of the liquid crystal display device can be improved.

The liquid crystal display according to another embodiment of the present invention further includes a gap column spacer disposed between the first substrate and the second substrate and a push column spacer having a lower height than the gap column spacer, May have a value equal to or greater than a height difference between the gap column spacer and the push column spacer.

The liquid crystal display device according to another embodiment of the present invention may further include at least a portion of the common electrode in the display area between the first substrate and the second substrate, And a metal layer in contact with the metal layer.

In the liquid crystal display according to another embodiment of the present invention, the at least one dam column spacer may have at least one opening in an edge region.

In the liquid crystal display device according to another embodiment of the present invention, the compensation layer may be configured to completely surround the liquid crystal layer.

The compensation layer disposed so as to overlap with the dam column spacer can be formed in the non-display portion of the liquid crystal display device according to the embodiment of the present invention. Thus, without changing the height of the dam column spacer through the mask redesign, It is possible to maintain a constant cell gap of the cell. As a result, the mura defects due to the luminance or color temperature fluctuation due to the cell gap difference can be reduced, and the display quality of the liquid crystal display can be improved.

In addition, since the compensation layer superimposed on the dam column spacer is configured to be in direct contact with the common electrode, the resistance of the common electrode can be reduced to improve the driving efficiency of the liquid crystal display device.

In addition, in the display unit of the liquid crystal display device according to an embodiment of the present invention, the metal layer functioning as the touch sensing electrode is formed of the same material as the compensation layer, The device can be easily implemented.

Further, since the metal layer having a low resistance is arranged in contact with the common electrode functioning as the touch sensing electrode, the touch driving efficiency of the liquid crystal display device can be improved in the implementation of the in-cell touch method.

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

The scope of the claims is not limited by the matters described in the contents of the invention, as the contents of the invention described in the problems, the solutions to the problems and the effects to be solved do not specify essential features of the claims.

1 is a plan view of a liquid crystal display device according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view showing I-I 'of Fig. 1. Fig.
3 is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.
4 is a cross-sectional view of a liquid crystal display device according to a third embodiment of the present invention.
5 is a plan view of a liquid crystal display device according to a fourth 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.

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.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is 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 a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is 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 sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

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.

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

FIG. 1 is a plan view of a liquid crystal display 100 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line I-I 'of FIG. 1 and 2, a liquid crystal display 100 includes a first substrate 11, a second substrate 12, a thin film transistor 20, a common electrode 40, a pixel electrode 50, A plurality of column spacers 71, 72 and 73, a sealant 80, a black matrix 91 and a color filter 92, Only the first substrate 11, the second substrate 12, the dam column spacer 73, the sealant 80 and the compensation layer 62 are illustrated in FIG. And the second substrate 12 are also indicated by solid lines.

The liquid crystal display device 100 includes a display area (DA) and a non-display area (NDA). The display area DA refers to an area in which an actual image is displayed and may be located at the center of the liquid crystal display device 100. [ The non-display area NDA means an outer area where an image is not displayed, and can be configured to surround the display area DA as shown in Fig. However, the present invention is not limited thereto, and the display area DA and the non-display area NDA may be formed at various positions according to the design or application of the liquid crystal display device 100. [ The liquid crystal display device 100 includes various components arranged in the non-display area NDA, which can be referred to as a display part of the liquid crystal display device 100, including various components arranged in the display area DA, ) Can be referred to as a non-display portion.

The first substrate 11 and the second substrate 12 may be disposed opposite to each other and the first substrate 11 may protrude from the second substrate 12. 1, a driver integrated circuit (driver IC, C) for supplying various signals to the display area DA may be disposed at the protruding portion of the first substrate 11. [ Although not shown in the drawings, a liquid crystal layer is disposed between the first substrate 11 and the second substrate 12.

The first substrate 11 and the second substrate 12 may be made of an insulating material, for example, a glass or a polyimide flexible film.

2, the thin film transistor 20 is disposed in the display region DA on the first substrate 11 and includes a gate electrode 21, an active layer 22, a source electrode 23, and a drain electrode 24 ). 2, the gate electrode 21 is disposed on the first substrate 11, and the gate insulating layer 31 covers the gate electrode 21. On the gate insulating layer 31, an active layer 22 is disposed so as to overlap with the gate electrode 21. On the active layer 22, the source electrode 23 and the drain electrode 24 are disposed apart from each other.

In this specification, the overlapping of two objects means that at least one part overlaps the existence of other objects in the top-bottom relation of the two objects, .

The gate electrode 21, the source electrode 23 and the drain electrode 24 are made of a conductive material such as molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au) (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

The active layer 22 may be formed of any one of amorphous silicon (a-Si), polycrystalline silicon (poly-Si), oxide, and organic materials depending on the kind of the thin film transistor 20 But is not limited thereto.

The gate insulating layer 31 may be composed of a single layer or a plurality of layers made of an inorganic material, such as silicon oxide (SiO _x ) or silicon nitride (SiN _x ).

Although the thin film transistor 20 is shown as a staggered structure in FIG. 2, the present invention is not limited thereto, and may be a coplanar structure.

On the thin film transistor 20, a planarizing layer 32 for exposing a part of the drain electrode 24 is disposed. The planarization layer 32 is disposed in the display area DA and the non-display area NDA on the first substrate 11. [ Alternatively, the planarizing layer 32 may extend from the display portion of the liquid crystal display device 100 to the non-display portion. The planarization layer 32 may be formed of a single layer or a plurality of layers made of an organic material, and may be made of polyimide or acryl.

On the planarization layer 32, the common electrode 40 and the pixel electrode 50 are disposed. The common electrode 40 and the pixel electrode 50 are insulated from each other by the passivation layer 33 and the pixel electrode 50 is electrically connected to the thin film transistor 20 through the contact holes of the passivation layer 33 and the planarization layer 32, And is electrically connected to the drain electrode 24 of the organic EL element. Depending on the type of the thin film transistor 20, the pixel electrode 50 may be electrically connected to the source electrode 23.

The common electrode 40 is composed of a plurality of patterns arranged apart from each other. For example, the common electrode 40 is formed on the first common electrode 41, the third common electrode 43, and the non-display area NDA disposed in the display area DA, as shown in Fig. 2 And a second common electrode 42 disposed thereon.

The third common electrode 43 overlapping the pixel electrode 50 among the common electrodes 40 is an electrode to which a reference voltage for driving the liquid crystal layer is applied and the pixel electrode 50 is connected to the pixel electrode 50 through the thin film transistor 20 It is an electrode that receives a signal voltage according to a signal. Referring to FIG. 2, the pixel electrode 50 has a plurality of slits 50S therein. A reference voltage applied to the third common electrode 43 through the plurality of slits 50S and a voltage applied to the pixel electrode 50 The fringe field is formed by the difference in the magnitude of the signal voltage applied to the gate electrode. The alignment direction of the liquid crystal molecules in the liquid crystal layer is changed by the fringe field, and the amount of transmitted light is adjusted and the brightness of the pixel is determined. 2, the pixel electrode 50 is disposed above the third common electrode 43. However, according to the design of the liquid crystal display device 100, the third common electrode 43 is electrically connected to the pixel electrode 50 As shown in FIG. Although the pixel electrode 50 includes a plurality of slits 50S in FIG. 2, the third common electrode 43 may include a plurality of slits according to designing .

The common electrode 40 and the pixel electrode 50 may each be formed of a transparent conductive oxide (TCO) material such as indium tin oxide (ITO).

On the common electrode 40 and the pixel electrode 50, an alignment film 34 is disposed. The alignment film 34 is an organic film used for aligning the liquid crystal layer in a desired direction. The alignment control force of the alignment layer 34 can be secured through a contact method such as a rubbing method or a non-contact method using UV (untraviolet) light. The alignment film 34 extends from the display area DA to the non-display area NDA.

The second substrate 12 includes a black matrix 91 and a color filter 92. The black matrix 91 is effective for blocking the transmission of undesired light and improving the contrast ratio. Light having passed through the liquid crystal layer by the common electrode 40 and the pixel electrode 50 passes through the color filter 92 and each pixel is realized. The black matrix 91 is disposed in a part of the display area DA of the liquid crystal display device 100 and a part of the non-display area NDA to block unwanted light from leaking to the outside.

The second substrate 12 may further include an upper planarization layer 35 to compensate for uneven step differences between the black matrix 91 and the color filter 92.

1 and 2, it is possible to prevent the liquid crystal layer from leaking in the non-display area NDA between the first substrate 11 and the second substrate 12, A sealant 80 for adhering the liquid crystal layer 12 is disposed so as to surround the liquid crystal layer.

Referring to FIG. 2, a plurality of column spacers 71, 72, and 73 are disposed between the alignment layer 34 of the first substrate 11 and the upper planarization layer 35 of the second substrate 12.

The plurality of column spacers 71, 72, and 73 function to maintain a cell gap between the first substrate 11 and the second substrate 12 and secure a liquid crystal injection space.

Specifically, a gap column spacer 71 and a push column spacer 72 are disposed in the display area DA of the first substrate 11 and the second substrate 12. The gap column spacer 71 serves to maintain a constant gap between the lower substrate and the upper substrate. The push column spacer 72 is spaced apart from the gap column spacer 71 and has a lower height than the gap column spacer 71 and has a pressure that can be concentrated in the gap column spacer 71 when an external force is applied As shown in FIG. Specifically, as shown in FIG. 2, the gap column spacer 71 and the push column spacer 72 may have a height difference of T1. The gap column spacer 71 and the push column spacer 72 are disposed at positions overlapping with the black matrix 91 so that the path of the light emitted to the outside through the color filter 92 may not be disturbed. In addition, a part of the alignment film 34 is damaged by the gap column spacer 71 or the push column spacer 72, and the alignment of the liquid crystal layer in the peripheral region of the column spacers 71, Even if the transmittance is changed, leakage of undesired light by the black matrix 91 can be blocked.

2, a dam column spacer 73 is disposed between the sealant 80 and the liquid crystal layer in the non-display area NDA between the first substrate 11 and the second substrate 12 do. 1, the dam column spacer 73 is disposed so as to surround the display area DA, and is disposed in the non-display area NDA of the first substrate 11 and the second substrate 12, Maintains the gap, and functions to inhibit the liquid crystal layer from moving to the sealant 80. Specifically, the dam column spacer 73 is disposed between the liquid crystal layer and the sealant 80 to suppress the liquid crystal layer from undesirably moving in the direction of the sealant 80, so that the sealant 80 is contaminated by the liquid crystal layer And serves to reduce defective laminating that may occur and poor mura due to un-filling of the liquid crystal in the display area DA.

The dam column spacer 73 has the same height as the push column spacer 72 in the display area DA and can be formed at the same time through the same process as the push column spacer 72.

The cell gap in the non-display area NDA between the first substrate 11 and the second substrate 12 can be determined by the dam column spacer 73. As described above, However, it may be very difficult to organically change or adjust the height of the dam column spacer 73 as the process environment or design is changed.

For example, as shown in FIG. 2, when the dam column spacer 73 has the same height as the push column spacer 72, and the process of other components such as the thin film transistor 20 is optimized, The height of the dam column spacer 73 may be formed to be lower than the initially designed height. Alternatively, when the lamination structure of the components included in the first substrate 11 or the second substrate 12 is changed to increase the distance between the two substrates 11 and 12 in the non-display area NDA, The distance between the two substrates 11 and 12 in the non-display area NDA can be larger than the initially designed height of the dam column spacer 73. [

In such a case, since the cell gap in the non-display area NDA is not properly maintained, the transmittance fluctuation occurs due to the difference in the cell gap, and the display quality of the liquid crystal display device 100 may be degraded have. Specifically, a portion of the cell gap between the two substrates 11 and 12 having a low cell gap may have a lower transmittance of light having a longer wavelength than that of a portion having a higher cell gap, thereby lowering the brightness or blurring the light. This causes defective mura in a part of the area of the liquid crystal display device 100, which may lead to a problem that the display quality of the liquid crystal display device 100 deteriorates.

In order to solve this problem, it is necessary to redesign the mask in order to change the height of the dam column spacer 72 in accordance with the process environment or design variation. However, the redesign of the mask may lead to an increase in manufacturing cost or an increase in manufacturing time, which may lead to a problem of lowering the productivity of the liquid crystal display device 100. [

The liquid crystal display device 100 according to the first embodiment of the present invention has the compensation layer 62 disposed in the non-display area NDA without changing the mask for adjusting the height of the dam column spacer 73 The cell gap between the first substrate 11 and the second substrate 12 can be organically changed or adjusted as the process environment or the design is changed. This will be described in detail as follows.

2, the compensator 60 of the liquid crystal display 100 includes a metal layer 61 arranged in contact with a part of the common electrode 40 and arranged in the display area DA, (NDA), and includes a compensation layer 62 arranged to surround the display area DA.

More specifically, the common electrode 40 includes a first common electrode 41 and a third common electrode 43 disposed in the display area DA and a second common electrode 42 disposed in the non-display area NDA ). The third common electrode 43 is an electrode for driving the liquid crystal layer together with the pixel electrode 50, as mentioned above. The second common electrode 42 of the non-display area NDA may be an electrode in which a part of the third common electrode 43 of the display area DA extends to the non-display area NDA. The second common electrode 42 and the third common electrode 43 may be electrically connected to each other to apply the same voltage. In comparison, the first common electrode 41 of the display area DA is electrically insulated from the second common electrode 42 and the third common electrode 43.

The compensating layer 62 of the non-display area NDA is in direct contact with the second common electrode 42 of the non-display area NDA and overlapped with the dam column spacer 73, ) And the second substrate 12 can be maintained, and the resistance of the second common electrode 42 can be lowered. In other words, when the cell gap between the first substrate 11 and the second substrate 12 changes as the process environment or design is changed, even if the height of the dam column spacer 73 through the mask redesign is not changed The cell gap between the first substrate 11 and the second substrate 12 can be maintained by adjusting the thickness T2 of the compensation layer 62. [ That is, the thickness T2 of the compensation layer 62 is formed to a thickness that maintains the cell gap between the first substrate 11 and the second substrate 12, and the thickness of the second common electrode 42 Thickness. Preferably, the thickness T2 of the compensation layer 62 is set to be equal to or greater than the height difference T1 between the gap column spacer 71 and the push column spacer 72 in the display area DA , The cell gap between the two substrates 11 and 12 in the non-display area NDA can be maintained while sufficiently compensating for the high resistance of the second common electrode 42. [

The compensation layer 62 may be made of a metal material having a resistance lower than that of the second common electrode 42 so as to more effectively lower the resistance of the second common electrode 42 and may be made of a metal material such as molybdenum (Mo) Aluminum (Al), copper (Cu), or an alloy thereof. The passivation layer 33 and the alignment layer 34 extending to the display area DA may be arranged to cover the compensation layer 62 and the second common electrode 42. [

The width of the compensation layer 62 is configured to have a value larger than the width of the dam column spacer 73, as shown in Fig. Therefore, in the process of forming the dam column spacer 73 or in the process of attaching the first substrate 11 and the second substrate 12 to each other, the alignment of the dam column spacer 73 and the compensation layer 62 This problem can be reduced. Here, the width of the dam column spacer 73 refers to the width of the lower surface of the dam column spacer 73 disposed close to the compensation layer 62. For example, as shown in the figure, when the dam column spacer 73 has an inverted trapezoidal column shape having a wider area than the lower surface, the width of the lower surface of the dam column spacer 73 is smaller than the width The problem of the misalignment of the dam column spacer 73 with the compensation layer 62 can be reduced.

The compensation section 60 includes a metal layer 61 which is disposed in the display area DA and is made of the same material as the compensation layer 62 and is configured to be in direct contact with the first common electrode 41 of the display area DA, As shown in FIG. The metal layer 61 has the same thickness as the compensation layer 62 and can be simultaneously formed through the same process. The metal layer 61 and the first common electrode 41 function as a touch sensing electrode and serve to detect a touch position of the user. Accordingly, the in-cell touch liquid crystal display device 100 can be easily implemented. The in-cell touch-type liquid crystal display device 100 is advantageous in that it is lightweight or thin in contrast to a liquid crystal display device in which a separate sensor for a touch function is attached (add-on touch). In addition, since the metal layer 61 made of a material having a lower resistance than the first common electrode 41 is disposed in contact with the first common electrode 41, only the first common electrode 41 functions as a touch sensing electrode In comparison, the resistance of the first common electrode 41 can be lowered. Accordingly, the touch driving efficiency of the liquid crystal display device 100 can be improved. When the metal layer 61 and the first common electrode 41 functioning as the touch sensing electrode are further disposed in the display area DA, the metal layer 61 or the first common electrode 41 is formed on the protruding part of the first substrate 11, A touch circuit portion electrically connected to the common electrode 41 may be additionally disposed.

As described above, the liquid crystal display device 100 according to the first embodiment of the present invention includes a display portion and a non-display portion surrounding the display portion. The display portion of the liquid crystal display device 100 includes a planarization layer 32, a first common electrode 41 on the planarization layer 32, a metal layer 61 in contact with the first common electrode 41, A gap column spacer 71 disposed on the alignment film 34 and a push column spacer 72 spaced apart from the gap column spacer 71. The gap column spacer 71 is disposed on the alignment film 34, The non-display portion of the liquid crystal display device 100 further includes a planarization layer 32 extending from the display portion, a second common electrode 42 electrically insulated from the first common electrode 41 on the planarization layer 32, A compensation layer 62 in contact with the second common electrode 42 and made of the same material as the metal layer 61, an alignment film 34 extending from the display section and covering the compensation layer 62, a compensation layer 62 A dam column spacer 73 disposed so as to overlap with the dam column spacer 73, and a sealant 80 surrounding the display portion. The liquid crystal display 100 according to the first embodiment of the present invention includes the compensation layer 62 overlapping the dam column spacer 73 in the non-display area NDA, The cell gap between the first substrate 11 and the second substrate 12 is maintained while the resistance is lowered. Accordingly, the driving efficiency of the liquid crystal display device 100 is improved and the display quality of the liquid crystal display device 100 can be improved by reducing the brightness due to the cell gap difference or the defective mura due to the color temperature variation. The liquid crystal display device 100 includes the metal layer 61 functioning as a touch metal electrode and made of the same material as the compensation layer 62 in the display area DA, And it is easy to implement the method. In addition, since the metal layer 61 having a low resistance is disposed in contact with the first common electrode 41, the touch driving efficiency of the liquid crystal display device 100 can be improved in the implementation of the in-cell touch method.

3 is a cross-sectional view of a liquid crystal display 200 according to a second embodiment of the present invention. 3, only the structure of the non-display area NDA of the liquid crystal display device 200 is shown. For the sake of convenience, a detailed description of the same or corresponding components to those of the previous embodiment will be omitted.

Referring to FIG. 3, a plurality of dam column spacers 73a and 73b are disposed in a non-display area between the first substrate 11 and the second substrate 12 of the liquid crystal display device 200. FIG. Alternatively, the non-display portion of the liquid crystal display device 200 includes a plurality of dam column spacers 73a and 73b.

The dam column spacers 73a and 73b include a first dam column spacer 73a and a second dam column spacer 73b. Although not shown in the drawing, the first dam column spacer 73a is arranged to surround the display area, and the second dam column spacer 73b can be arranged to surround the first dam column spacer 73b.

In this case, both the first dam column spacer 73a and the second dam column spacer 73b may be arranged so as to overlap with the compensation layer 2.

In the case where the area of the non-display area NDA of the liquid crystal display device 200 is large or a sufficient space is secured in the non-display area NDA according to the design, according to the second embodiment of the present invention, The cell gap between the first substrate 11 and the second substrate 12 can be more stably supported by arranging the plurality of dam column spacers 73a and 73b in the NDA. Further, since the area of the compensation layer 62 is increased, the area in which the common electrode and the compensation layer 62 are in contact also increases, so that the resistance of the second common electrode 42 can be further lowered.

4 is a cross-sectional view of a liquid crystal display device 300 according to a third embodiment of the present invention. Fig. 4 shows only the structure of the non-display area NDA of the liquid crystal display device 300 as in Fig. For the sake of convenience, a detailed description of the same or corresponding components to those of the previous embodiment will be omitted.

Referring to FIG. 4, a plurality of dam column spacers 73a and 73b are disposed in a non-display area between the first substrate 11 and the second substrate 12 of the liquid crystal display device 300. Alternatively, the non-display portion of the liquid crystal display device 300 includes a plurality of dam column spacers 73a and 73b.

When the spacing distance between the dam column spacers 73a and 73b is large according to the design of the liquid crystal display device 300, the compensation layer may be separately arranged so as to correspond to each of the plurality of dam column spacers 73a and 73b . Specifically, the compensation layer overlaps with the first compensation layer 62a and the second dam column spacer 73b which overlap with the first dam column spacer 73a, as shown in Fig. 4, And a second compensation layer 62b spaced apart from the layer 62a by a predetermined distance. Although not shown in the drawing, the first compensation layer 62a is arranged so as to surround the display area, like the first dam column spacer 73a, and the second compensation layer 62b is disposed to cover the first compensation layer 62a and the second compensation layer 62b. And may be arranged to surround the first dam column spacer 73a.

A plurality of dam column spacers 73a and 73b are disposed in the non-display area NDA to allow the cell gap between the first substrate 11 and the second substrate 12 to be larger And can be stably supported. In addition, when the spacing distance between the plurality of dam column spacers 73a and 73b is large, the plurality of compensation layers 62a and 62b may be spaced apart from each other to correspond to each of the plurality of dam column spacers 73a and 73b have. Accordingly, it is possible to prevent the areas of the compensating layers 62a and 62b made of the metal material from becoming too large, thereby reducing the problem of foreign matter from being generated due to static electricity during the process.

5 is a plan view of a liquid crystal display 400 according to a fourth embodiment of the present invention. For the sake of convenience of description, detailed description of the same or corresponding components to those of the previous embodiment will be omitted.

Referring to FIG. 5, the dam column spacer 73 disposed to surround the display area DA has at least one open area (OA) in the edge area. Although the figure shows a structure in which a plurality of openings OA are formed in all the four corner regions of the dam column spacer 73, the openings OA may be formed in at least one of the four corner regions according to the design.

The dam column spacer 73 according to the fourth embodiment of the present invention is capable of preventing the liquid crystal layer from moving to the sealant 80 and preventing the occurrence of an unfilled region of the liquid crystal in the display area DA have. Specifically, the dam column spacer 73 functions as a movement path of the liquid crystal layer, and a part of the liquid crystal layer is moved to the edge region along the dam column spacer 73, so that a part of the liquid crystal layer becomes a specific portion It is possible to prevent a situation in which they do not spread and spread.

In the fourth embodiment of the present invention, the compensation layer 62 disposed so as to overlap with the dam column spacer 73 can be arranged so as to completely surround the display area DA. In other words, since the dam column spacer 73 includes at least one opening OA in the edge area, a part of the dam column spacer 73 can be constructed discontinuously. However, the compensation layer 62 is configured to completely enclose the display area DA without a discontinuous portion such as the opening OA of the dam column spacer 73. Thereby, in the area where the compensation layer 62 and the common electrode are in contact with each other, there is no portion to be reduced due to the opening portion OA or the like, so that the resistance of the common electrode can be lowered more effectively.

Although not shown in the drawing, in the case where the dam column spacer 73 is composed of a plurality of dam column spacers as in the second embodiment or the third embodiment described above, both of the plurality of dam column spacers have at least one opening OA ). Alternatively, the dam column spacer, which is disposed closer to the sealant (80), includes at least one dam column spacer disposed closer to the display area than the plurality of dam column spacers, and at least one opening (OA) 62, it is also possible to completely surround the display area DA.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100, 200, 300, 400: liquid crystal display
11: a first substrate
12: second substrate
20: Thin film transistor
31: Gate insulating layer
32: planarization layer
33: Passivation layer
34: Orientation film
35: upper planarization layer
41: first common electrode
42: second common electrode
43: third common electrode
50: pixel electrode
61: metal layer
62: compensation layer
71: gap column spacer
72: push column spacer
73: Dam column spacer
80: Sealant
91: Black Matrix
92: Color filter

Claims

A liquid crystal display device including a display portion and a non-display portion surrounding the display portion
The display unit includes:
A planarization layer on the first substrate;
A first common electrode on the planarization layer;
A metal layer in contact with the first common electrode;
An alignment layer covering the metal layer;
A gap column spacer on the alignment layer; And
And a push column spacer spaced apart from the gap column spacer,
The non-
A planarization layer extending from the display portion on the first substrate;
A second common electrode electrically insulated from the first common electrode on the planarization layer;
A compensating layer in contact with the second common electrode and made of the same material as the metal layer;
An alignment layer extending from the display unit and covering the compensation layer;
A dam column spacer superimposed on the compensation layer on the alignment layer; And
And a sealant surrounding the display portion on the planarizing layer.

The method according to claim 1,
The display unit may further include a liquid crystal layer,
Wherein the dam column spacer is disposed so as to surround the display portion so that the liquid crystal layer is inhibited from moving to the sealant.

The method according to claim 1,
And the compensating layer is configured to have a thickness that maintains a cell gap of the non-display portion.

The method according to claim 1,
Wherein the thickness of the compensation layer has a value equal to or greater than a difference in height between the gap column spacer and the push column spacer.

The method according to claim 1,
Wherein the metal layer functions as a touch sensing electrode.

The method according to claim 1,
Wherein the width of the compensation layer has a value larger than a width of the dam column spacer.

The method according to claim 1,
The dam column spacer
A first dam column spacer surrounding the display portion,
And a second dam column spacer surrounding the first dam column spacer.

8. The method of claim 7,
Wherein the compensation layer is arranged to overlap both the first dam column spacer and the second dam column spacer.

8. The method of claim 7,
Wherein the compensation layer comprises:
A first compensation layer superimposed on the first dam column spacer,
And a second compensation layer superimposed on the second dam column spacer and spaced apart from the first compensation layer.

The method according to claim 1,
Wherein the dam column spacer has at least one opening in an edge region.

11. The method of claim 10,
And the compensation layer is configured to completely surround the display portion.

A liquid crystal layer in a display region between the first substrate and the second substrate;
A common electrode for driving the liquid crystal layer on the first substrate;
A sealant surrounding the liquid crystal layer in a non-display area between the first substrate and the second substrate;
At least one dam column spacer configured to inhibit movement of the liquid crystal layer to the sealant in the non-display area between the liquid crystal layer and the sealant; And
And a compensation layer superposed on the at least one dam column spacer and configured to have a thickness that maintains a gap between the first substrate and the second substrate while lowering the resistance of the common electrode, .

13. The method of claim 12,
A gap column spacer disposed between the first substrate and the second substrate,
Further comprising a push column spacer having a lower height than the gap column spacer,
Wherein the thickness of the compensation layer has a value equal to or greater than a difference in height between the gap column spacer and the push column spacer.

13. The method of claim 12,
And a metal layer formed on the display region between the first substrate and the second substrate and made of the same material as the compensation layer and in contact with at least a part of the common electrode so as to function as a touch sensing electrode.

13. The method of claim 12,
Wherein the at least one dam column spacer has at least one opening in an edge region.

13. The method of claim 12,
And the compensation layer is configured to completely surround the liquid crystal layer.