KR102614676B1 - Liquid Crystal Display Device - Google Patents

Abstract

A liquid crystal display device according to an embodiment of the present invention is provided on a first substrate, a second substrate, and a first substrate having defined opening areas and light-shielding areas, and includes a thin film transistor including a gate electrode, a source electrode, and a drain electrode, and a first transistor. A liquid crystal display device that is provided on a substrate and includes a bump located on an upper part of a thin film transistor, a column spacer provided on a second substrate, and a light leak prevention pattern located on a first substrate and provided on the lower part of at least one side of the bump. It is characterized by

Description

Liquid Crystal Display Device

The present invention relates to a liquid crystal display device, and more specifically, to a liquid crystal display device capable of minimizing the occurrence of light leakage defects occurring on the outside of bumps and improving the aperture ratio.

With the advent of the full-fledged information age, the field of displays that visually display electrical information signals is rapidly developing. Accordingly, research is continuing to improve the performance of various flat display devices such as thinner, lighter, and lower power consumption.

Representative examples of such flat panel displays include Liquid Crystal Display devices (LCD), Plasma Display Panel devices (PDP), Field Emission Display devices (FED), and organic light emitting display devices. (Organic Light Emitting Display device: OLED), etc.

Among them, liquid crystal displays are currently being used the most, replacing CRTs (Cathode Ray Tubes) as mobile image display devices due to their excellent image quality, light weight, thinness, and low power consumption. Liquid crystal display devices are being developed for various purposes, such as television and computer monitors that receive and display broadcast signals, in addition to portable applications such as laptop computer monitors.

A liquid crystal display (LCD) includes a color filter substrate on which a color filter is formed, a thin film transistor substrate on which a thin film transistor is formed, and a liquid crystal layer formed between the color filter substrate and the thin film transistor substrate.

In the case of recent liquid crystal display devices, the purpose is to improve image quality defects that occur when the column spacer placed on the color filter substrate damages the lower alignment film when an external force is applied, and stain defects that occur due to volume fluctuations in the liquid crystal layer. A structure in which bumps are formed on the thin film transistor substrate to correspond to the column spacer is applied.

More specifically, the liquid crystal display device structure is formed by first completing a thin film transistor on a thin film transistor substrate, then additionally forming a bump on the thin film transistor of the thin film transistor substrate, and bonding the thin film transistor substrate and the color filter substrate. It is completed by forming the column spacer on the color filter substrate against the bump of the thin film transistor substrate.

Here, when the bump is formed close to the opening area of the liquid crystal display device due to an error in the process, the end of the bump, that is, the outer portion of the bump, is illuminated by light emitted from the back light unit below the thin film transistor. As light is scattered, light leakage may occur, which may reduce the contrast ratio of the liquid crystal display device.

Accordingly, in the conventional liquid crystal display device, a black matrix extension pattern (BM Extension Pattern) is formed in addition to the black matrix (BM) formed on the color filter substrate to prevent light leakage at the ends of the bumps as described above.

At this time, the size of the black matrix extension added to the black matrix must be formed considering not only the error in the final finished line width of the bump and the black matrix, but also the adhesion margin between the thin film transistor substrate and the color filter substrate.

Therefore, in the case of forming a black matrix extension in addition to the black matrix disposed on the second substrate to prevent light leakage from the end of the bump, that is, the outer portion of the bump, as in a conventional liquid crystal display device, the bump is not applied. There is a problem that the aperture ratio of the liquid crystal display device is greatly reduced compared to the liquid crystal display device.

The present invention was devised to solve the above problems, and its purpose is to provide a liquid crystal display device capable of minimizing light leakage defects occurring on the outside of bumps and improving the aperture ratio.

Problems to be solved according to embodiments of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, a liquid crystal display device is provided that can minimize light leakage defects occurring at the outer portion of the bump and improve the aperture ratio.

A liquid crystal display device according to an embodiment of the present invention is provided on a first substrate, a second substrate, and a first substrate having defined opening areas and light-shielding areas, and includes a thin film transistor including a gate electrode, a source electrode, and a drain electrode, and a first transistor. A liquid crystal display device that is provided on a substrate and includes a bump located on an upper part of a thin film transistor, a column spacer provided on a second substrate, and a light leak prevention pattern located on a first substrate and provided on the lower part of at least one side of the bump. It is characterized by

The light leak prevention pattern may be disposed at the boundary between the opening area and the light blocking area.

The bump has a rectangular shape, and the light leak prevention pattern may be disposed on at least one corner of the four corners of the bump on the plane.

The anti-light leakage pattern may be placed closer to the opening area than the bump.

The light leak prevention pattern may be made of the same material in the same layer as the gate electrode.

The thin film transistor further includes a light blocking layer located below the gate electrode, and the light leak prevention pattern may be made of the same material as the light blocking layer.

The thin film transistor further includes a touch electrode located on top of the source and drain electrode, and the light leak prevention pattern may be made of the same material in the same layer as the touch electrode.

It may further include a black matrix provided on the second substrate, and the light blocking area may be defined by the black matrix and the light leak prevention pattern.

The column spacer may be disposed so that at least a portion of the column spacer contacts the bump.

The light leak prevention pattern may be square, square with rounded corners, or circular.

In another aspect, a liquid crystal display device according to an embodiment of the present invention includes a TFT array substrate including a thin film transistor (TFT), a color filter substrate including a black matrix and a column spacer, and a light source provided below the TFT array substrate. The TFT array substrate includes a bump disposed on top of the thin film transistor, is disposed on the bottom of the bump, and has a structure to minimize light leakage defects that may occur on the outer portion of the bump due to light emitted from the light source. It is characterized as a liquid crystal display device.

A thin film transistor includes a plurality of metal electrodes located on different layers, and the structure may be made of the same material in the same layer as at least one of the plurality of metal electrodes.

The plurality of metal electrodes are made of an opaque metal, and the plurality of metal electrodes may be one of a light blocking layer, a gate electrode, and a touch electrode.

The bump may be arranged to contact at least a portion of the column spacer.

The structure may be arranged to surround at least a portion of the outer portion of the bump in a plane view.

The light blocking area can be defined by the black matrix and structure.

If the light blocking area is defined only by the black matrix, the size of the contrast aperture area can be increased.

In another aspect, a liquid crystal display device according to an embodiment of the present invention includes a TFT substrate consisting of an array of thin film transistors (TFTs) corresponding to each of a plurality of sub-pixels, and a color filter ( A plurality of bumps on the CF) substrate and the TFT substrate, a plurality of column spacers corresponding to the bumps on the CF substrate, and a black matrix (BM) that divides the gap between sub-pixels and absorbs external light reflection. ) and a structure that is not part of the black matrix and is implemented to prevent light leakage of the bump.

By using the above structure, the aperture ratio of the sub-pixel can be improved compared to a structure in which part of the black matrix is used to prevent light leakage of the bump.

The structure may be implemented as a metal pattern made of the same material as the electrode material included in the TFT on the TFT substrate so that the adhesion margin between the TFT substrate and the CF substrate is minimized.

A liquid crystal display device according to an embodiment of the present invention includes a bump disposed on an upper portion of a thin film transistor, disposed on a lower portion of the bump, and made of the same material in the same layer as at least one of the plurality of metal electrodes of the thin film transistor to prevent light leakage. By providing a pattern, it is possible to minimize the occurrence of light leakage defects that appear at the outer edge of the bump due to light emitted from a light source at the bottom of the thin film transistor substrate.

In addition, the liquid crystal display device according to an embodiment of the present invention can minimize the adhesion margin between the thin film transistor substrate and the color filter substrate by providing a light leakage prevention pattern at the bottom of the bump, that is, on the thin film transistor substrate, and thus is a part of the conventional black matrix. Compared to the structure used to prevent light leakage of bumps, the aperture ratio of the liquid crystal display device can be improved by increasing the size of the opening area.

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

Since the content of the invention described above in the problem to be solved, the means for solving the problem, and the effect do not specify the essential features of the claim, the scope of the claim is not limited by the matters described in the content of the invention.

FIG. 1A is a diagram showing the light leakage phenomenon at the end of a bump of a conventional liquid crystal display device.
FIG. 1B is a diagram showing the planar structure of a bump formation area of another conventional liquid crystal display device.
FIG. 1C is a diagram showing a cross-sectional structure of a bump formation area of another conventional liquid crystal display device.
Figure 2 is a diagram showing a cross-sectional structure of a thin film transistor area of a liquid crystal display device according to an embodiment of the present invention.
Figure 3 is a diagram showing the planar structure of a liquid crystal display device according to an embodiment of the present invention.
Figure 4 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to an embodiment of the present invention.
FIG. 5 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to another embodiment of the present invention.
FIG. 6 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete, and are known to those skilled in the art in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description. In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

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

Each feature of the various embodiments of the present invention can be combined or combined with each other, partially or entirely, and various technological interconnections and operations are possible, and each embodiment can be implemented independently of each other or together in a related relationship. It may be possible.

Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

FIG. 1A is a diagram showing the light leakage phenomenon at the end of a bump of a conventional liquid crystal display device.

First, referring to FIG. 1A, the conventional liquid crystal display device 10a includes a first substrate 11, a buffer layer 12, a gate insulating film 13, an interlayer insulating film 14, a first protective film 15, and a second protective film. (16), a bump 17, a second substrate 21, a black matrix 22, a color filter 23, an overcoat 24, a column spacer 25, and a light source 30.

That is, when an external force is applied to the liquid crystal display device 10a, the color filter (CF) substrate, that is, the column spacer 25 disposed on the second substrate 21 damages the lower alignment layer and causes poor image quality and liquid crystal layer. In order to improve spotting defects caused by volume fluctuations, a bump ( It can be configured to include bump, 17).

More specifically, the conventional liquid crystal display device 10a includes a buffer layer 12, a gate insulating film 13, a gate electrode (GA), an interlayer insulating film 14, and a first protective film 15 formed on a first substrate 11. , includes a second protective film 16 and a bump 17, and also includes a black matrix 22, a color filter 23, an overcoat 24, and a column spacer 25 formed on the second substrate 21. , When the first substrate 11 and the second substrate 21 are bonded, the bumps 17 of the first substrate 11 and the column spacers 25 of the second substrate 21 are formed to contact each other. It can be. Additionally, the liquid crystal display device 10a may be configured to include a light source 30 such as a back light unit provided under the first substrate 11.

In addition, in the case of the conventional liquid crystal display device 10a, the black matrix 22 formation area provided on the second substrate 21 blocks light emitted from the light source 30 provided on the lower part of the first substrate 11. The area where the black matrix 22 is not formed may be defined as an aperture area (DA) through which light emitted from the light source 30 passes.

Referring to FIG. 1A, the bump 17 should originally be located within the light blocking area (SA) defined by the black matrix 22, but the bump 17 is shifted due to an error in the process, and the required When formed close to the opening area DA of the liquid crystal display device 10a rather than the position where As a result, light is scattered at the end of the bump 17, that is, at the outer portion of the bump 17, and is exposed to the aperture area DA, which may cause light leakage. This may cause the contrast ratio of the liquid crystal display device 10a to decrease. Ratio) may decrease and poor image quality may occur.

FIG. 1B is a diagram showing the planar structure of a bump formation area of another conventional liquid crystal display device.

Additionally, FIG. 1C is a diagram showing the cross-sectional structure of the bump formation area of another conventional liquid crystal display device. That is, FIG. 1C shows the cross-sectional structure at line Ⅰ-°' of FIG. 1B.

That is, as previously shown in FIG. 1A, in the case of the conventional liquid crystal display device 10a, the bump 17 is shifted due to an error in the process and is not in the required position of the liquid crystal display device 10a. The end of the bump 17, that is, the bump 17, is formed close to the opening area DA by light emitted from the light source 30, such as a backlight unit under the thin film transistor substrate, that is, the first substrate 11. A light leakage phenomenon occurred where light was scattered from the outer part of the area and exposed to the aperture area (DA).

Referring to FIGS. 1B and 1C to solve the above problem, in another conventional liquid crystal display device 10b, a black matrix extension 22a is added in addition to the black matrix 22 formed on the second substrate 21. ) was formed to prevent light leakage occurring at the end of the bump 17 due to the shift of the bump 17 as described above.

At this time, the size of the black matrix extension 22a added to the black matrix 22 is determined not only by the error in the final finished line width of the bump 17, the black matrix 22, and the black matrix extension 22a, but also by the thickness of the thin film transistor substrate, That is, it must be formed taking into account the adhesion margin between the first substrate 11 and the color filter substrate, that is, the second substrate 21, and therefore the black matrix extension portion 22a formed additionally on the black matrix 22 is It must be formed to have a sufficient size to prevent light leakage due to the shift of the bump 17.

Therefore, as shown in FIGS. 1B and 1C, as in other conventional liquid crystal display devices 10b, it occurs at the outer portion of the bump 17, that is, at the end of the bump 17, that is, at the outer portion of the bump 17. In order to prevent light leakage, when the black matrix extension portion 22a is configured in addition to the black matrix 22 disposed on the second substrate 21, the aperture area DA is reduced compared to a conventional liquid crystal display device that does not apply bumps. As the size decreases, the aperture ratio of the liquid crystal display device decreases significantly.

Figure 2 is a diagram showing a cross-sectional structure of a thin film transistor area of a liquid crystal display device according to an embodiment of the present invention.

That is, FIG. 2 is a diagram showing the cross-sectional structure of the liquid crystal display device 100 in the thin film transistor (TFT) formation area disposed in the display area of the liquid crystal display device 100 according to an embodiment of the present invention.

Referring to FIG. 2, a light blocking layer 115 is formed on the first substrate 110. The light blocking layer 115 may serve to prevent light leakage current generated in the thin film transistor when light from a light source provided under the first substrate 110 is incident on the semiconductor layer 125.

Next, a buffer layer 120 is formed on the light blocking layer 115 to cover the entire surface of the first substrate 110. The buffer layer 120 may serve to protect the thin film transistor from impurities such as alkali ions leaking from the substrate 110 when the semiconductor layer 125 is crystallized.

Next, the semiconductor layer 125 is formed on the buffer layer 120. The semiconductor layer 125 is made of amorphous silicon, poly crystalline silicon, and metal oxide semiconductor materials such as indium gallium zinc oxide (IGZO) and zinc tin oxide. : ZTO) or zinc indium oxide (ZIO).

Next, a gate insulating layer 130 is formed on the semiconductor layer 125 to cover the entire surface of the first substrate 110.

Next, a gate electrode 135 is formed on the gate insulating layer 130. The gate electrode 135 may be formed in a branched form to correspond to each sub-pixel area from the gate line arranged in the first horizontal direction on the substrate 110.

Next, an interlayer insulating film 140 is formed on the gate electrode 135 to cover the entire surface of the first substrate 110. Additionally, the interlayer insulating film 140 may have a contact hole exposing a portion of the semiconductor layer 125 formed below.

Next, source and drain electrodes 145 are formed on the interlayer insulating film 140, respectively overlapping on both sides of the planar semiconductor layer 125 and positioned to be spaced apart from each other. Additionally, the source electrode of the source and drain electrodes 145 may be formed in a branched form to correspond to each sub-pixel area from a data line arranged in a second direction perpendicular to the first direction.

Next, a first protective layer 150 having a contact hole exposing a portion of the lower source and drain electrodes 145 is formed on the source and drain electrodes 145 and the interlayer insulating film 140. The first protective layer 150 may be made of an organic insulating material with a flat surface, such as photo-acryl.

Next, the third conductive layer 155 is formed on the first protective layer 150. The third conductive layer 155 may be used as a touch electrode that detects or transmits a touch signal from outside the liquid crystal display device.

Additionally, the third conductive layer 155 may be formed of a low-resistance metal material such as copper (Cu) or may be made of a multilayer containing aluminum (Al), molybdenum (Mo), and aluminum (Al) and molybdenum (Mo). However, it is not necessarily limited to this.

Next, the second protective layer 160 is formed on the third conductive layer 155. The second protective layer 160 includes a contact hole exposing a portion of the lower source and drain electrodes 145.

Next, the pixel electrode 165 is formed on the second protective layer 160. The pixel electrode 165 is electrically connected to a portion of the exposed source and drain electrodes 145 through a contact hole formed through the first protective layer 150 and the second protective layer 160.

Next, bumps 170 are formed on the second protective layer 160. The bump 170 may be formed of an organic film or an inorganic film, and is disposed at a position corresponding to the column spacer 250 provided on the second substrate 210, and is applied to the liquid crystal display device 100 when an external force is applied. The column spacer 25 disposed on the second substrate 210 may prevent image quality defects that occur when the lower alignment layer is damaged and stain defects that occur due to volume fluctuations in the liquid crystal layer.

Also, referring to FIG. 2, the color filter substrate, that is, the second substrate 210, of the liquid crystal display device 100 according to an embodiment of the present invention is located opposite to the thin film transistor substrate, that is, the first substrate 110, and has a black It may be configured to include a matrix 220, a first color filter 231, a plurality of color filters including the first color filter 232, an overcoat 240, and a column spacer 250.

Additionally, the column spacer 250 may be in contact with the first substrate 110 to maintain a cell gap between the first substrate 110 and the second substrate 210, and may be provided on the first substrate 110. It may be placed in a position corresponding to the bump 170.

Figure 3 is a diagram showing the planar structure of a liquid crystal display device according to an embodiment of the present invention.

Additionally, Figure 4 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to an embodiment of the present invention. That is, FIG. 4 shows the cross-sectional structure along line IV-₃' of the liquid crystal display device according to the embodiment of the present invention shown in FIG. 3.

In describing the liquid crystal display device 100 according to an embodiment of the present invention, detailed overlapping descriptions of components that are the same as or correspond to the thin film transistor (TFT) described with reference to FIG. 2 will be omitted.

Referring to Figures 3 and 4, the liquid crystal display device 100 according to an embodiment of the present invention includes a first substrate 110 and a second substrate 210 on which an opening area (DA) and a light blocking area (SA) are defined. and a light source 300 provided under the first substrate 110.

More specifically, referring to FIG. 4, the liquid crystal display device 100 according to an embodiment of the present invention includes a buffer layer 120, a gate insulating layer 130, a light leak prevention pattern 135M (MP), an interlayer insulating layer 140, First protective film 150, third electrode layer 155, second protective film 160, bump 170, second substrate 210, black matrix 220, color filter 230, overcoat 240, It may be configured to include a column spacer 250 and a light source 300.

In addition, the first substrate 110 of the liquid crystal display device 100 according to an embodiment of the present invention includes the thin film transistor (TFT) described with reference to FIG. 2 and is provided on the first substrate 110, and the It may be configured to include a bump 170 located on top of a thin film transistor (TFT).

In addition, the second substrate 210 of the liquid crystal display device 100 according to an embodiment of the present invention includes a black matrix 220, a color filter 230, and an overcoat 240 that divide the interval between sub-pixels and absorb external light reflection. and a column spacer 250.

Additionally, when bonding the first substrate 110 and the second substrate 210, the bump 170 of the first substrate 110 and the column spacer 250 of the second substrate 210 are at least partially in contact with each other. They can be placed opposite each other.

Also, referring to FIG. 3, the thin film transistor (TFT) substrate, that is, the first substrate 110, of the liquid crystal display device 100 according to an embodiment of the present invention includes light leakage prevention patterns (MP1, MP2, MP3, MP4). It can be configured as follows.

More specifically, the liquid crystal display device 100 according to an embodiment of the present invention may include light leak prevention patterns MP1, MP2, MP3, and MP4 provided on the lower portion of at least one side of the bump 170. That is, light leak prevention patterns (MP1, MP2, MP3, MP4) are structures for preventing light leakage occurring at the end of the bump 170, that is, the outer portion of the bump 170, due to the shift of the bump 170. may be arranged to surround at least a portion of the outer portion of the bump 170 on a plane.

Also, referring to FIG. 3, the light leakage prevention patterns (MP1, MP2, MP3, MP4) of the liquid crystal display device 100 according to an embodiment of the present invention will be disposed at the boundary between the opening area (DA) and the light blocking area (SA). You can.

More specifically, each of the light leak prevention patterns (MP1, MP2, MP3, MP4) has a light blocking area (SA) defined by the black matrix 220 and an opening area (DA) in which the black matrix 220 is not formed. It may be placed between, that is, at the boundary between the opening area DA and the light blocking area SA.

As described above, the light leak prevention patterns (MP1, MP2, MP3, MP4) are placed at the boundary between the opening area (DA) and the light blocking area (SA), so that the bump 170 is shifted to the required position due to errors in the process. When formed close to the opening area DA of the liquid crystal display device 100, the thin film blocks the passage of light from the light source 300 at the bottom of the first substrate 110 to the end of the bump 170. Light emitted from the light source 300 below the transistor substrate, that is, the first substrate 110, scatters light from the end of the bump 170, that is, the outer portion of the bump 170, and flows into the opening area DA. It can play a role in minimizing the occurrence of light leakage that occurs due to exposure. That is, the light leak prevention patterns MP1, MP2, MP3, and MP4 may be arranged closer to the opening area DA than the bump 170 to prevent light leakage due to the shift of the bump 170.

Also, referring to FIG. 3, the bump 170 has a rectangular shape, and the light leak prevention patterns MP1, MP2, MP3, and MP4 may be disposed on at least one corner of the four corners of the bump 170 on the plane. .

In addition, the light leakage prevention patterns (MP1, MP2, MP3, MP4) are not limited in their shape. For example, they may be made of a square, a square with rounded corners, or a circle, but are not necessarily limited thereto.

Additionally, the light leak prevention patterns (MP1, MP2, MP3, and MP4) shown in FIG. 3 have the same configuration as the light leak prevention pattern (135M(MP)) shown in FIG. 4. That is, the light leakage prevention pattern 135M(MP) of the liquid crystal display device 100 according to an embodiment of the present invention may be made of the same material in the same layer as the gate electrode 135 described with reference to FIG. 2. That is, the light leakage prevention pattern 135M (MP) blocks the passage of light from the light source 300 provided at the bottom of the first substrate 110 to the end of the bump 170, thereby preventing the light from moving due to the shift of the bump 170. The occurrence of light leakage occurring at the end of the bump 170 can be minimized.

Additionally, in the liquid crystal display device 100 according to an embodiment of the present invention, the light blocking area SA includes a black matrix 220 provided on the second substrate 210 and a light leak prevention pattern provided on the second substrate 110. It can be defined by (135M(MP)).

That is, in the case of the liquid crystal display device 100 according to an embodiment of the present invention, the black matrix extension part is not formed compared to the liquid crystal display device of the conventional structure, and the light leak prevention pattern 135M (MP) is formed on the first substrate 110. Since there is no need to consider a bonding margin due to bonding of the first substrate 110 and the second substrate 210, the light blocking area SA is formed in the black matrix 220 like a liquid crystal display device of a conventional structure. ) and the case defined only by the black matrix extension, the size of the anti-light leakage patterns (MP1, MP2, MP3, MP4) can be reduced, thus reducing the size of the light blocking area (SA) and reducing the aperture area (DA). As the size of , the aperture ratio of the liquid crystal display device can be improved.

That is, the liquid crystal display device 100 according to an embodiment of the present invention has a TFT substrate 110 made of an array of thin film transistors (TFTs) corresponding to each of a plurality of sub-pixels, and faces the same. A plurality of bumps 170 are visible on the color filter (CF) substrate 210 and the TFT substrate 110, and a plurality of column spacers 250 corresponding to the bumps 170 on the CF substrate 210 and between sub-pixels. It is characterized by including a black matrix 220 that divides the gap and absorbs external light reflection, and a structure that is not part of the black matrix and is implemented to prevent light leakage of the bump 170.

In addition, the structure, that is, the light leakage prevention patterns (MP1, MP2, MP3, MP4), can improve the aperture ratio of the sub-pixel compared to a liquid crystal display device with a conventional structure in which a part of the black matrix is used to prevent light leakage of the bump 170. there is.

In addition, the structure, that is, the light leakage prevention patterns (MP1, MP2, MP3, MP4), is formed on the TFT substrate 110 so that the bonding margin between the TFT substrate 110 and the CF substrate 210 is minimized, that is, the bonding margin does not need to be considered. It may be implemented as an opaque metal pattern made of the same material as the electrode material included in the TFT 110.

FIG. 5 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to another embodiment of the present invention.

In describing a liquid crystal display device according to another embodiment of the present invention, redundant detailed descriptions of the same or corresponding components described previously will be omitted.

Referring to FIG. 5, the light leak prevention pattern 555M(MP) of the liquid crystal display device 500 according to another embodiment of the present invention includes the light leak prevention patterns MP1, MP2, MP3, and MP4 shown in FIG. 3. It is the same configuration. That is, the light leak prevention pattern 555M(MP) may be disposed on at least one corner of the four corners of the bump 170 on a plane.

In addition, the light leakage prevention pattern 555M (MP) of the liquid crystal display device 500 according to another embodiment of the present invention is the source and drain electrode ( The third conductive layer located on top of 145), that is, the same layer as the touch electrode 155, may be made of the same material.

That is, referring to FIG. 5, the light leakage prevention pattern 555M(MP) formed of the same material on the same layer as the touch electrode 155 is emitted from the light source 300 provided on the lower part of the first substrate 110. By blocking light from traveling to the end of the bump 170, it is possible to minimize the occurrence of light leakage that occurs at the end of the bump 170, that is, at the outer portion of the bump 170, due to the shift of the bump 170.

FIG. 6 is a diagram showing a cross-sectional structure of a bump area of a liquid crystal display device according to another embodiment of the present invention.

In describing a liquid crystal display device according to another embodiment of the present invention, redundant detailed descriptions of the same or corresponding components described previously will be omitted.

Referring to FIG. 6, the light leak prevention pattern 615M (MP) of the liquid crystal display device 600 according to another embodiment of the present invention is the light leak prevention pattern (MP1, MP2, MP3, MP4) shown in FIG. 3. It has the same configuration as That is, the light leak prevention pattern 615M(MP) may be disposed on at least one corner of the four corners of the bump 170 on a plane.

Also, referring to FIG. 6, the light leakage prevention pattern 615M(MP) of the liquid crystal display device 600 according to another embodiment of the present invention is the liquid crystal display device according to the embodiment of the present invention described with reference to FIG. 2 ( It may be made of the same material as the light blocking layer 115 located below the gate electrode 135 of 100.

That is, referring to FIG. 6, the light leak prevention pattern 615M(MP) formed of the same material in the same layer as the light blocking layer 115 is emitted from the light source 300 provided on the lower part of the first substrate 110. By blocking light from traveling to the end of the bump 170, it is possible to minimize the occurrence of light leakage that occurs at the end of the bump 170, that is, at the outer portion of the bump 170, due to the shift of the bump 170.

Summarizing the above results, the liquid crystal display device according to the embodiment of the present invention includes a bump disposed on an upper portion of a thin film transistor, is disposed on a lower portion of the bump, and is located on the same layer as at least one of the plurality of metal electrodes of the thin film transistor. By providing a light leak prevention pattern made of the same material, it is possible to minimize the occurrence of light leak defects that appear on the outer edge of the bump due to light emitted from a light source at the bottom of the thin film transistor substrate.

In addition, the liquid crystal display device according to an embodiment of the present invention has a light leak made of the same material in the same layer as at least one of a plurality of metal electrodes such as a light blocking layer, a gate electrode, and a touch electrode of the thin film transistor of the first substrate at the lower part of one side of the bump. By providing an prevention pattern, the adhesion margin between the thin film transistor substrate and the color filter substrate can be minimized, thereby increasing the size of the aperture area compared to a structure that uses part of the black matrix to prevent light leakage of bumps, and improving the aperture ratio of the liquid crystal display device. You can do it.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be implemented with various modifications without departing from the technical spirit of the present invention. there is. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: liquid crystal display device
110: first substrate
115: light blocking layer
120: buffer layer
125: semiconductor layer
130: gate insulating film
135: gate electrode
135M: Light leak prevention pattern
140: interlayer insulating film
145: source and drain electrodes
150: 1st shield
155: touch electrode
160: 2nd shield
170: bump
210: second substrate
220: Black Matrix
230: color filter
240: Overcoat
250: column spacer
300: light source
DA: aperture area
SA: Shading area

Claims (21)

A first substrate and a second substrate with defined opening areas and light blocking areas;
a thin film transistor provided on the first substrate and including a gate electrode, a source electrode, and a drain electrode;
an organic insulating layer covering the thin film transistor;
a touch electrode on the organic insulating layer;
a protective layer on the touch electrode;
a pixel electrode on the protective layer;
Bumps located on top of the protective layer and the touch electrode;
a column spacer provided on the second substrate; and
A light leak prevention pattern disposed below the bump and disposed to overlap at least one side of the bump,
The touch electrode is disposed to at least partially overlap the bump and the column spacer. According to claim 1,
A liquid crystal display device including a data line overlapping in the same direction as the touch electrode. According to claim 1,
The touch electrode is arranged to intersect a gate line branching from the gate electrode. delete According to claim 1,
The liquid crystal display device wherein the light leak prevention pattern is made of the same material as the touch electrode. According to claim 1,
The liquid crystal display device wherein the light leak prevention pattern is made of the same material on the same layer as the gate electrode. According to claim 1,
The touch electrode is disposed below at least one side of the bump on the first substrate, and one end of the touch electrode overlaps the bump and is disposed in the light blocking area. According to claim 1,
The touch electrode is disposed below at least one side of the bump on the first substrate, and the other end of the touch electrode is disposed closer to the opening area than an end of the bump. According to claim 1,
Further comprising a black matrix provided in the light blocking area of the second substrate,
The liquid crystal display device wherein the light leak prevention pattern is disposed between the opening area and the black matrix. According to clause 9,
An end of the black matrix is disposed farther from the opening area than an end of the bump, and the light leak prevention pattern is disposed closer to the opening area than the bump. According to claim 1,
The column spacer is disposed so that at least a portion of the column spacer contacts the bump. A TFT array substrate including a thin film transistor (TFT) having an opening area and a light blocking area defined and including a plurality of metal electrodes located in different layers, a touch electrode, and a pixel electrode disposed on the touch electrode;
A color filter substrate including a black matrix and a column spacer;
a light source provided below the TFT array substrate;
a bump disposed on top of the thin film transistor; and
A structure disposed below the bump, arranged to overlap at least one side of the bump, and minimizing light leakage defects that may occur at the outer edge of the bump due to light emitted from the light source,
The TFT array substrate includes data lines that overlap side by side in the same direction as the touch electrode,
The touch electrode is disposed to at least partially overlap the bump and the column spacer. According to claim 12,
The end of the structure is disposed closer to the opening area where the black matrix is not formed than the end of the bump,
The touch electrode is a liquid crystal display device made of the same material as at least one electrode among the plurality of metal electrodes. According to claim 13,
The structure is a liquid crystal display device made of the same material in the same layer as at least one of the plurality of metal electrodes. According to claim 12,
The TFT array substrate includes a gate line disposed to intersect the touch electrode and the data line. According to claim 12,
The touch electrode is disposed on the TFT array substrate to overlap a lower portion of at least one side of the bump, and one end of the touch electrode overlaps the bump and is disposed in the light blocking area. According to claim 12,
The touch electrode is disposed to overlap at least one side of the bump on the TFT array substrate, and the other end of the touch electrode is disposed closer to the opening area than an end of the bump. A TFT substrate consisting of an array of thin film transistors (TFTs) corresponding to each of a plurality of sub-pixels and a color filter (CF) substrate facing the TFT substrate;
A plurality of bumps on the TFT substrate;
a plurality of column spacers corresponding to the bumps on the color filter substrate;
a black matrix (BM) that divides the interval between the sub-pixels and absorbs external light reflection; and
A structure disposed below the bump, disposed to overlap at least one side of the bump, and configured to prevent light leakage of the bump,
The thin film transistor includes a gate electrode, a source electrode, and a drain electrode,
The TFT substrate includes a touch electrode disposed to intersect a gate line branched from the gate electrode and a pixel electrode disposed on the touch electrode,
The touch electrode is disposed to at least partially overlap the bump and the column spacer. According to clause 18,
A liquid crystal display device in which the touch electrodes overlap in the same direction as the data line. According to clause 18,
The structure is not part of the black matrix,
A liquid crystal display device in which an end of the structure is disposed closer to an opening area in which the black matrix is not formed than an end of the bump.

According to claim 1,
The touch electrode is disposed to overlap the bump and the column spacer.