KR102224348B1 - Liquid crystal display panel and method of manufacturing the same - Google Patents

Abstract

An object of the present invention is to provide a liquid crystal display panel capable of preventing color mixing defects and light leakage defects on a screen occurring between neighboring pixels. The liquid crystal display panel according to the present invention for achieving the above-described technical problem includes a lower substrate having a gate line and a data line intersecting each other, an upper substrate facing the lower substrate and provided with a black matrix, and the It includes a liquid crystal layer provided between the lower substrate and the upper substrate, and a color mixing prevention part is positioned under the black matrix so as to overlap the data line.

Description

A liquid crystal display panel and its manufacturing method TECHNICAL FIELD

The present invention relates to a liquid crystal display panel, and more particularly, to a liquid crystal display panel in which a color mixing prevention unit is located under a black matrix, and a method of manufacturing the same.

As the era develops into an information society, the importance of a flat panel display device (FPD) having excellent characteristics such as thinner, lighter, and low power consumption is increasing. Flat panel displays include a liquid crystal display device (LCD), a plasma display panel device (PDP), an organic light emitting display device (OLED), and the like, and an electrophoretic display device. (EPD: Electrophoretic Display Device) is also widely used.

Among them, a liquid crystal display device including a thin film transistor is excellent in resolution, color display, image quality, and the like, and is widely commercialized as a display device for a television, notebook computer, tablet computer, or desktop computer.

1 is a cross-sectional view showing the structure of a conventional liquid crystal display panel.

As shown in FIG. 1, a conventional liquid crystal display panel includes a lower substrate 10 equipped with a thin film transistor, facing the lower substrate 10, and includes a black matrix 25 and a color filter 23. And a liquid crystal layer 40 formed between the upper substrate 20 and the lower substrate 10 and the upper substrate 20. In such a conventional liquid crystal display panel, the lower substrate 10 and the upper substrate 20 are each manufactured and then bonded together to complete the liquid crystal display panel.

However, in a conventional liquid crystal display panel, when the lower substrate 10 and the upper substrate 20 are bonded together, misalignment may occur due to process deviation. As the misalignment occurs, a color washout defect may occur between neighboring pixels.

The color washout defect is a defect in which two different colors adjacent to each other are mixed in a side viewing angle direction (direction of an arrow shown in FIG. 1) of a liquid crystal display panel and displayed as an image. For example, when turning on the liquid crystal in the blue color filter 23a of the color filters formed on the upper substrate 20, a blue screen is displayed when looking at the display panel from the front. do. However, when the same display panel is viewed from the side (in the direction of the arrow shown in Fig. 1), the path of light is changed and the mixed color of blue and green is mixed through the blue color filter 23a and the green color filter 23b. It is indicated as. This is because some of the liquid crystals turned on in the blue color filter 23a area due to misalignment are moved to the neighboring green color filter 23b area, and the green color filter This is because light passing through (23b) is generated.

This color washout defect is not necessarily caused by misalignment, and may be caused when the light at the viewing angle of the liquid crystal display panel is not blocked. However, when the misalignment occurs, color washout defects in the liquid crystal display panel may become more severe. The color washout defect is not shown in the drawing, but may also occur between the green color filter 23b and the red color filter region.

As described above, in the conventional case, there is a problem in that the color reproducibility and display quality of the liquid crystal display panel are deteriorated due to the poor color washout.

The present invention has been proposed to solve the above-described problems, and an object of the present invention is to provide a liquid crystal display panel capable of improving color reproduction and display quality by preventing color mixing defects occurring between neighboring pixels.

In addition to the technical problems of the present invention mentioned above, other features and advantages of the present invention will be described below or will be clearly understood by those of ordinary skill in the art from such technology and description.

The liquid crystal display panel according to the present invention for achieving the above-described technical problem includes a lower substrate having gate lines and data lines intersecting each other, an upper substrate facing the lower substrate and having a black matrix, and the lower substrate. It includes a liquid crystal layer provided between the substrate and the upper substrate, and a color mixing prevention part overlapping the data line is positioned under the black matrix.

In addition, the method of manufacturing a liquid crystal display panel according to the present invention includes forming a gate line and a data line on a lower substrate, forming a pixel for each crossing region of the gate line and the data line, and forming a black matrix on the upper substrate. Forming a color mixing prevention unit on the upper substrate so as to overlap the black matrix, forming a liquid crystal on the lower substrate, and bonding the lower substrate and the upper substrate, wherein the color mixing prevention unit It is formed to overlap the data line of the lower substrate.

According to an exemplary embodiment of the present invention, since the color mixing prevention part is located under the black matrix, the amount of liquid crystal under the black matrix may be reduced. Accordingly, since the amount of liquid crystal under the black matrix, which is an area where color mixing occurs, decreases, a color washout defect occurring between neighboring pixels can be prevented.

In addition, according to another embodiment of the present invention, even if pressure is applied from the outside, the movement of the column spacer may be blocked by the color mixing prevention unit, thereby preventing damage to the alignment layer, thereby preventing light leakage defects on the screen. I can.

Accordingly, the defect in color washout and the defect in light leakage can be prevented, so that the color reproducibility and display quality of the liquid crystal display panel can be improved.

1 is a cross-sectional view showing the structure of a conventional liquid crystal display panel.
2 is an exemplary view schematically showing a configuration of a liquid crystal display device to which a liquid crystal display panel according to the present invention is applied.
3 is a plan view showing a structure of a liquid crystal display panel according to an exemplary embodiment of the present invention.
4 is a cross-sectional view illustrating a structure of a liquid crystal display panel according to an exemplary embodiment of the present invention.
5A to 5C are cross-sectional views illustrating a method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention.
6 is a plan view showing a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention.
7 is a plan view illustrating a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention.
8 is a cross-sectional view illustrating a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When'include','have', and'consist of' mentioned in the present specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, when a temporal predecessor relationship is described as'after','following','after','before', etc.,'right' or'direct' It may also include cases that are not continuous unless this is used.

First, second, etc. are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or can be implemented together in an association relationship. May be.

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

2 is an exemplary view schematically showing a configuration of a liquid crystal display device to which a liquid crystal display panel according to the present invention is applied.

The liquid crystal display according to the present invention includes a liquid crystal display panel 100 and a panel driver 400, 300, 200, as shown in FIG. 2.

Although not shown in detail in the drawings, the liquid crystal display panel 100 includes a lower substrate, an upper substrate, and a liquid crystal layer.

The lower substrate crosses each other and is connected to gate lines GL1 to GLg and data lines DL1 to DLd, and to the gate lines GL1 to GLg and data lines DL1 to DLd, which define a pixel P region. It may include a thin film transistor, a pixel electrode connected to the thin film transistor, and a common electrode that forms an electric field together with the pixel electrode to adjust an alignment direction of a liquid crystal layer, which will be described later.

The upper substrate may include a black matrix (BM) and a color filter.

The liquid crystal layer is provided between the upper and lower substrates.

A polarizing plate may be attached to each of the upper and lower substrates, and an alignment layer for setting an alignment direction of the liquid crystal may be provided on an inner surface in contact with the liquid crystal.

In addition, a column spacer (CS) for maintaining a cell gap may be additionally provided between the upper substrate and the lower substrate of the liquid crystal display panel 100.

The liquid crystal display panel 100 will be described in detail below with reference to FIGS. 3 to 8.

The panel drivers 400, 300, and 200 include a timing controller 400, a data driver 300, and a gate driver 200.

The timing controller 400 receives timing signals such as a data enable signal (Data Enable, DE) and a dot clock (CLK) from an external system, and the operation timing of the data driver 300 and the gate driver 200 It generates control signals (GCS, DCS) for controlling

The data driver 300 converts the image data input from the timing controller 400 into the data voltage, and converts the data voltage for one horizontal line into the data voltage for every horizontal period in which a scan pulse is supplied to the gate line. Supply to the lines.

The gate driver 200 shifts a gate start pulse (GSP) transmitted from the timing controller 400 according to a gate shift clock (GSC), and sequentially shifts the gate lines GL1 ~GLg) is supplied with a scan pulse having a gate-on voltage (Von). In addition, the gate driver 200 supplies a gate-off voltage Voff to the gate lines GL1 to GLg during the remaining period in which the scan pulse having the gate-on voltage Von is not supplied.

In the above description, the data driver 300, the gate driver 200, and the timing controller 400 have been described as being independently configured, but at least one of the data driver 300 or the gate driver 200 May be configured in the timing controller 400.

3 is a plan view showing the structure of a liquid crystal display panel according to an embodiment of the present invention, mainly showing a lower substrate, and FIG. 4 is a cross-sectional view showing the structure of a liquid crystal display panel according to an embodiment of the present invention. 3 is a cross-sectional view showing a cross-section taken along the AB direction. First, a planar structure of a liquid crystal display panel according to an embodiment of the present invention will be described with reference to FIG. 3, and then a cross-sectional structure of a liquid crystal display panel according to an embodiment of the present invention will be described with reference to FIG. 4. .

As shown in FIG. 3, according to an exemplary embodiment of the present invention, a plurality of pixels are defined by crossing the gate line GL and the data line DL. A thin film transistor Tr and a pixel electrode 165 are formed in each of the pixels. The gate line GL, the data line DL, the thin film transistor Tr, and the pixel electrode 165 are formed on the lower substrate of the liquid crystal display panel 100.

The thin film transistor Tr is formed in a cross region between the gate line GL and the data line DL of each pixel. The thin film transistor Tr includes a gate electrode 120, an active layer (not shown), a source electrode 122 and a drain electrode 121. The gate electrode 120 is connected to the gate line GL, the source electrode 122 is connected to the data line DL, and the drain electrode 121 faces the source electrode 122 have.

The pixel electrode 165 is connected to the drain electrode 121 of the thin film transistor Tr through a contact hole x. The pixel electrode 165 may be formed in a zig-zag shape having at least one curvature. However, the present invention is not limited thereto, and the pixel electrode 165 may be formed to have a straight shape or a finger pattern or comb-shaped.

A column spacer 190 and a color mixing prevention part 185 are formed on the upper substrate of the liquid crystal display panel 100.

The column spacer 190 serves to maintain a constant cell gap between the lower substrate and the upper substrate. The column spacer 190 is located in a region through which light is not transmitted, such as a region overlapping the thin film transistor Tr, so that the light transmittance is not reduced due to the column spacer 190.

The color mixing prevention part 185 is formed to overlap the data line DL to prevent color mixture from occurring between a plurality of pixels. Since the width of the color mixing prevention part 185 is formed smaller than the width of the data line DL, a decrease in light transmittance due to the color mixing prevention part 185 may be prevented.

The data line DL according to the exemplary embodiment of the present invention may be formed in a zig-zag shape having at least one curvature according to the shape of the pixel electrode 165. Accordingly, the color mixing prevention part 185 formed to overlap with the data line DL may be formed in a zig-zag shape having at least one curvature similar to the data line DL. In addition, the color mixing prevention part 185 may be provided to extend in the length direction of the data line DL, and may be formed in the shape of a bar structure. However, the present invention is not limited thereto, and the color mixing prevention part 185 may have various shapes such as a straight shape according to the shape of the data line DL.

The color mixing prevention part 185 may not overlap with the gate line GL. However, it is not necessarily limited thereto, and may be overlapped in some cases.

As shown in FIG. 4, a liquid crystal display panel 100 according to an exemplary embodiment of the present invention includes a lower substrate 160, an upper substrate 180, and a liquid crystal layer 140.

The lower substrate 160 includes a gate insulating layer 162 formed on the first substrate 161, a data line DL formed on the gate insulating layer 162, and a planarization layer 164 formed on the data line DL. ), a common electrode 167 formed on the planarization layer 164, a protective layer 168 formed on the common electrode 167, and a pixel electrode 165 formed on the protective layer 168.

The gate insulating layer 162 is formed between the gate line (GL in FIG. 3 described above) and the data line DL to insulate both. The planarization layer 164 is formed on the thin film transistor (Tr of FIG. 3 described above) to protect the thin film transistor (Tr of FIG. 3 described above) and planarize the substrate.

The common electrode 167 and the pixel electrode 165 are disposed up and down with the passivation layer 168 therebetween to form an electric field between the common electrode 167 and the pixel electrode 165. Meanwhile, the common electrode 167 may be formed on the protective layer 168 and the pixel electrode 165 may be formed under the protective layer 168. That is, the pixel electrode 165 and the common electrode 167 may be formed in a pixel electrode on the common electrode in which the pixel electrode 165 is formed on the common electrode 167, and the The common electrode 167 may also be formed in a common electrode on the pixel electrode formed on the pixel electrode 165.

The upper substrate 180 includes a black matrix (BM) 183 formed on the second substrate 181, a color filter (CF) 182 formed on the black matrix 183, and the An overcoating layer 187 formed on the color filter 182 and a color mixing prevention part 185 formed on the overcoating layer 187 are included.

The black matrix 183 is positioned between the R(Red), G(Green), and B(Blue) patterns of the color filter 182, respectively, and the R(Red), G(Green), B(Blue) It performs the function of distinguishing or blocking the light of light.

The color filter 182 is used to implement color in the liquid crystal display panel 100. The color filter 182 is provided with R (Red), G (Green), and B (Blue) patterns.

The overcoat layer 187 covers the entire surface of the second substrate 181 on which the black matrix 183 and the color filter 182 are provided in order to planarize the color filter 182. A column spacer (190 in FIG. 3 described above) is formed on the overcoat layer 187 to maintain a constant cell gap between the lower substrate 160 and the upper substrate 180.

The color mixing prevention part 185 is formed on the overcoating layer 187 like the column spacer (190 in FIG. 3 described above), and thus, the color mixing prevention part 185 and the overcoating layer 187 are simultaneously Can be formed.

In this case, the height of the color mixing prevention part 185 may be formed smaller than the height of the column spacer (190 in FIG. 3 described above), and the width W _C of the color mixing prevention part 185 is the black matrix ( It may be formed to be smaller than the width (W _{B) of 183.} Accordingly, a color mixing prevention unit 185 capable of effectively blocking light from a side viewing angle may be provided without affecting the cell gap and not reducing the aperture ratio of the liquid crystal display panel 100.

The color mixing prevention part 185 may be formed to overlap the black matrix 183 under the black matrix 183. Since the color mixing prevention part 185 is located under the black matrix 183, the amount of the liquid crystal 141 under the black matrix 183 may be reduced as described later.

In an embodiment of the present invention, the present invention has been described by taking as an example that the color mixing prevention part 185 is formed on the upper substrate 180, but the present invention is not limited thereto, and the color mixing prevention part 185 is It may be formed on the lower substrate 160.

When the color mixing prevention part 185 is formed on the lower substrate 160, the color mixing prevention part 185 may be formed to overlap the data line DL above the data line DL. In addition, the color mixing prevention part 185 may be located under the black matrix 183 to face the black matrix 183, and the width W _C of the color mixing prevention part 185 is the black matrix It may be less than the width (W _{B) of 183.}

A liquid crystal layer 140 is provided between the lower substrate 160 and the upper substrate 180. In the liquid crystal display panel 100, among various properties of the liquid crystals 141 provided in the liquid crystal layer 140, an image is displayed by using the property of changing the arrangement of liquid crystal molecules when a voltage is applied to the liquid crystal 141. Is displayed.

In this case, the height of the color mixing prevention part 185 may be formed smaller than the height of the liquid crystal layer 140. That is, the height of the color mixing prevention part 185 may be formed to be smaller than the cell gap between the bonded lower substrate 160 and the upper substrate 180.

For example, when the cell gap between the lower substrate 160 and the upper substrate 180 is 3.28 μm, the height of the color mixing prevention part 185 may be formed in a range of 1 μm to 3 μm. However, the height of the color mixing prevention part 185 is not limited to the above-described value, and the height of the color mixing prevention part 185 is variously formed according to the cell gap of the lower substrate 160 and the upper substrate 180. Can be.

As described above, since the color mixing prevention part 185 is formed under the black matrix 183, the amount of liquid crystal 141 that may be provided under the black matrix 183 is reduced, resulting in color washout. Defect can be prevented. That is, even if misalignment occurs due to a process deviation when the upper substrate 180 and the lower substrate 160 are bonded together, since the amount of the liquid crystal 141 under the black matrix 183 is reduced, Since the probability that the liquid crystals 141 under the black matrix 183 may move to neighboring pixels is small, a color washout defect may be prevented.

In addition, since a color washout defect occurring between neighboring pixels may be improved, a color reproducibility and reliability of a liquid crystal display panel may be improved, and display quality may be improved.

5A to 5C are cross-sectional views illustrating a method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention, and relate to a manufacturing process of the liquid crystal display panel according to FIG. 4 described above. Accordingly, the same reference numerals are assigned to the same configurations, and descriptions of repeated parts in materials and structures of each configuration are omitted.

First, as shown in FIG. 5A, the lower substrate 160 includes a first substrate 161, a gate insulating layer 162, a data line DL, a planarization layer 164, a common electrode 167, and a protective layer ( 168), and a pixel electrode 165.

The gate insulating layer 162 is formed on the entire first substrate 161. The gate insulating layer 162 may be formed of an inorganic insulating material, for example, a silicon oxide layer (SiO _X ), a silicon nitride layer (SiN _X ), or multiple layers thereof, but is not limited thereto.

The data line DL may be provided on the gate insulating layer 162. The data line DL is, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be a single layer or multiple layers made of any one or an alloy thereof, but is not limited thereto.

The planarization layer 164 is formed on the data line DL. The planarization layer 164 functions to planarize an upper portion of the first substrate 161 on which the data line DL is formed.

The planarization film 164 is, for example, an acrylic resin, an epoxy resin, a phenolic resin, a polyamides resin, a polyimide resin, It may be formed of one or more of unsaturated polyesters resin, poly-phenylene resin, polyphenylenesulfides resin, and benzocyclobutene, It is not limited to this.

The common electrode 167 is formed on the planarization layer 164. A common voltage Vcom for driving a liquid crystal is applied to the common electrode 167. The common electrode 167 may be formed of, for example, a transparent conductive material such as indium tin oxide (ITO), but is not limited thereto.

The common electrode 167 according to the exemplary embodiment of the present invention may be formed in a rectangular shape, and thus may be provided on the entire surface of the first substrate 161. However, the present invention is not limited thereto, and the common electrode 167 may be formed in a zig-zag shape having at least one curvature similar to the pixel electrode 165 to be described later. In addition, the common electrode 167 may be formed in a straight shape or a finger pattern or comb-shaped.

The protective layer 168 is formed on the entire surface of the first substrate 161 on which the common electrode 167 is provided. The passivation layer 168 may be made of the same material as the planarization layer 164, but is not limited thereto.

The pixel electrode 165 is formed on the passivation layer 168. The pixel electrode 165 may be formed in a zig-zag shape having at least one curvature. However, the present invention is not limited thereto, and the pixel electrode 165 may be formed to have a straight shape or a finger pattern or comb-shaped.

The pixel electrode 165 may be formed of, for example, a transparent conductive material such as indium tin oxide (ITO).

Although not shown in the drawing, a lower alignment layer for aligning the liquid crystal layer 140 may be formed on the entire surface of the lower substrate 160. The lower alignment layer will be described in detail with reference to the following drawings.

Next, as shown in FIG. 5B, the upper substrate 180 includes a second substrate 181, a black matrix (BM) 183, a color filter (CF) 182, and an overcoat layer. (187) is included.

The black matrix 183 is formed on the second substrate 181. As the black matrix 183 is formed, a contrast ratio of the liquid crystal display panel 100 may be improved, and a leakage current of the thin film transistor (Tr of FIG. 3 described above) may be reduced.

The black matrix 183 is an organic film made of a resin material, for example, a colored resin such as acrylic, epoxy, or polyimide resin including either carbon black or black pigment. It may be made of an organic resin or the like, but is not limited thereto.

The color filter 182 is used to implement color in the liquid crystal display panel 100. The color filter 182 has R (Red), G (Green), and B (Blue) patterns formed thereon.

The overcoat layer 187 covers the upper entire surface of the second substrate 181 on which the black matrix 183 and the color filter 182 are formed in order to planarize the color filter 182.

The overcoating layer 187 is, for example, an acrylic resin, an epoxy resin, a phenolic resin, a polyamides resin, a polyimide resin, It may be formed of one or more of unsaturated polyesters resin, poly-phenylene resin, polyphenylenesulfides resin, and benzocyclobutene, It is not limited to this.

The color mixing prevention part 185 is formed on the overcoat layer 187. The color mixing prevention part 185 is formed to overlap the black matrix 183. Further, the color mixing prevention part 185 is formed at a position overlapping with the data line DL formed on the lower substrate 160 in the step of bonding the lower substrate 160 and the upper substrate 180 together.

Although not shown in the drawing, a column spacer is formed on the gate electrode of the thin film transistor Tr while the color mixing prevention part 185 is formed. The color mixing prevention part 185 and the column spacer may be simultaneously formed through the same process.

The color mixing prevention unit 185 and the column spacer may be manufactured using a method of differentially irradiating the amount of light, such as a graytone mask and an R-pattern mask. have.

The graytone mask is a method of forming patterns having different thicknesses by using a mask having a light blocking part, a light transmitting part, and a semi-transmitting part. The R-pattern mask is a method of forming a fine pattern by using an overlapping effect of diffracted light. Here, the light-shielding part is a part that blocks light, the light-transmitting part is a part that transmits light, and the semi-transmitting part refers to a part in which the transmittance amount of light is less than that of the light-transmitting part.

When a pattern is formed using the graytone mask or R-pattern mask, patterns having different heights may be formed by differentially irradiating the amount of light.

That is, the color mixing prevention part 185 and the column spacer may be simultaneously formed, and may be formed on the second substrate 181 so that the height of the color mixing prevention part 185 is smaller than the height of the column spacer.

Although not shown in the drawing, an upper alignment layer for aligning the liquid crystal layer 140 may be formed on the color mixing prevention part 185 and the column spacer. The upper alignment layer will be described in detail with reference to the accompanying drawings.

Finally, as shown in FIG. 5C, the liquid crystal 141 is dropped on the lower substrate 160, and the lower substrate 160 and the upper substrate 180 are bonded to each other. Accordingly, a liquid crystal layer 140 including liquid crystals 141 is formed between the lower substrate 160 and the upper substrate 180.

In an embodiment of the present invention, the present invention is described by taking as an example that the liquid crystal layer 140 is formed by dropping the liquid crystal 141 on the lower substrate 160. However, the present invention is not limited thereto, and the liquid crystal layer 140 may be formed by dropping the liquid crystal 141 on the upper substrate 180.

Here, the height of the color mixing prevention part 185 is smaller than the height of the liquid crystal layer 140. That is, the height of the color mixing prevention part 185 is formed to be smaller than the cell gap between the bonded lower substrate 160 and the upper substrate 180.

6 is a plan view illustrating a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention. The liquid crystal display panel according to another embodiment of the present invention is the same as the embodiment of the present invention except for the shape of the color mixing prevention part 185. Accordingly, the same reference numerals are assigned to the same configurations, and descriptions of repeated parts in materials and structures of each configuration are omitted.

As shown in FIG. 6, the color mixing prevention part 185 may be formed of a bar structure extending in the length direction of the data line DL. In this case, the bar structure includes a first bar structure 185a and a second bar structure 185b that are separated from each other. That is, the color mixing prevention unit 185 according to another embodiment of the present invention may be configured by being separated into a first bar structure 185a and a second bar structure 185b at a portion where the data line DL is bent. have.

7 is a plan view illustrating a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention, and FIG. 8 is a cross-sectional view illustrating a structure of a liquid crystal display panel according to another exemplary embodiment of the present invention. In particular, FIG. 8 is a cross-sectional view of the plan view of FIG. 7 taken in the C-D direction. The liquid crystal display panel according to another embodiment of the present invention is similar to the embodiment of the present invention, except that the shape of the color mixing prevention part 185 and the column spacer 190, and the formation position of the column spacer 190 are changed. same. Accordingly, the same reference numerals are assigned to the same configurations, and descriptions of repeated parts in materials and structures of each configuration are omitted. First, a planar structure of a liquid crystal display panel according to another embodiment of the present invention will be described with reference to FIG. 7, and then a cross-sectional structure of a liquid crystal display panel according to another embodiment of the present invention will be described with reference to FIG. 8.

As shown in FIG. 7, according to another embodiment of the present invention, the column spacer 190 may be positioned to overlap the thin film transistor Tr, and specifically, may be configured to overlap the gate line GL. have. The column spacer 190 may be formed of a bar structure extending in the length direction of the gate line GL. A plurality of bar structures may be configured while being spaced apart from each other.

The color mixing prevention part 185 extends in the length direction of the data line DL, and, unlike the above-described embodiment, it extends close to the thin film transistor Tr region, and overlaps the gate electrode 120 as shown. It can extend to the area. As described above, the color mixing prevention part 185 extending to the vicinity of the thin film transistor Tr serves to block the movement of the column spacer 190. That is, the column spacer 190 is positioned so as not to overlap with the color mixing prevention part 185, and at this time, since the end of the color mixing prevention part 185 extends near the column spacer 190, the column spacer Even if 190 moves, it is blocked by the color mixing prevention part 185 so that it cannot move any more. Accordingly, the movement area of the column spacer 190 may be adjusted by adjusting the distance between the end of the color mixing prevention part 185 and the column spacer 190. As described above, when the color mixing prevention part 185 extends near the thin film transistor Tr region, the column spacer 190 may be blocked from entering the pixel region.

As shown in FIG. 8, according to another embodiment of the present invention, a gate line GL, a gate insulating layer 162, and a data line DL are formed on the first substrate 161 constituting the lower substrate 160. ), a planarization layer 164, a common electrode 167, and a protective layer 168 are sequentially provided. In addition, a column spacer 190 is provided on the passivation layer 168, and a lower alignment layer 171 is provided on the column spacer 190.

A black matrix 183, a color filter 182, and an overcoat layer 187 are provided on the second substrate 181 constituting the upper substrate 180. In addition, a color mixing prevention part 185 is provided on the overcoat layer 187, and an upper alignment layer 172 is provided on the color mixing prevention part 185.

As described above, according to another embodiment of the present invention, the column spacer 190 is provided on the first substrate 161 constituting the lower substrate 160 and the color mixing prevention unit 185 constitutes the upper substrate 180 It is provided on the second substrate 181. However, the present invention is not limited thereto, and the column spacer 190 is on the second substrate 181 constituting the upper substrate 180 and the color mixing prevention unit 185 is a first substrate constituting the lower substrate 160 It is also possible to be located on 161.

The color mixing prevention part 185 and the column spacer 190 are positioned so as to overlap the black matrix 183, and accordingly, a decrease in light transmittance can be prevented, as in the above-described embodiment.

As shown, since the color mixing prevention part 185 is formed on one side and the other side of the column spacer 190, respectively, the movement of the column spacer 190 by the color mixing prevention part 185 even when pressure is applied from the outside. This may be blocked, thereby preventing damage to the upper alignment layer 172 and the lower alignment layer 171 caused by the movement of the column spacer 190. Since damage to the upper alignment layer 172 and the lower alignment layer 171 is prevented as described above, defects in light leakage on the screen may be prevented, and color gamut and display quality of the liquid crystal display panel may be improved.

In another embodiment of the present invention, when the column spacer 190 and the color mixing prevention part 185 are formed on the same substrate, the color mixing prevention part 185 moves the column spacer 190. Since it cannot be blocked, the column spacer 190 and the color mixing prevention part 185 are disposed on different substrates in order to obtain a motion blocking effect of the column spacer 190.

The thin film transistor according to the present invention may be formed in a bottom gate method. However, the present invention is not limited thereto, and the thin film transistor may be formed in a top gate method.

In addition, the thin film transistor Tr may be an amorphous silicon thin film transistor (a-Si TFT), a polysilicon thin film transistor (poly-Si TFT), an oxide thin film transistor (Oxide TFT), or the like. In addition, the transistors may be N-type or P-type thin film transistors.

Those skilled in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: panel 200: gate driver
300: data driver 400: timing controller
183: black matrix 185: color mixing prevention unit

Claims (19)

A lower substrate having gate lines and data lines intersecting each other;
An upper substrate facing the lower substrate and having a black matrix;
A liquid crystal layer provided between the lower substrate and the upper substrate; And
And a column spacer provided between the upper substrate and the lower substrate,
A color mixing prevention part overlapping the data line is located under the black matrix,
The column spacer is made of a bar structure extending in the length direction of the gate line,
The column spacer is a liquid crystal display panel disposed to overlap with both the data line and the gate line at a position where the data line and the gate line cross each other. The method of claim 1,
The height of the color mixing prevention part,
A liquid crystal display panel that is smaller than a cell gap between the lower substrate and the upper substrate. The method of claim 2,
The height of the color mixing prevention part is in the range of 1 μm to 3 μm. The method of claim 1,
The width of the color mixing prevention part is smaller than the width of the black matrix,
The liquid crystal display panel, wherein the color mixing prevention part overlaps the black matrix. The method of claim 1,
The liquid crystal display panel having a bar structure extending in the length direction of the data line. The method of claim 5,
The bar structure includes a first bar structure and a second bar structure that are separated from each other. The method of claim 6,
The data line includes at least one curved portion,
The first bar structure and the second bar structure are separated from the curved portion of the data line. The method of claim 1,
The liquid crystal display panel, wherein the color mixing prevention part does not overlap with the gate line. The method of claim 1,
The liquid crystal display panel, wherein the color mixing prevention part overlaps the gate line. delete The method of claim 1,
The liquid crystal display panel provided so that the color mixing prevention part and the column spacer do not overlap with each other. The method of claim 1,
The column spacer is positioned under the black matrix and is provided to overlap the gate line. The method of claim 1,
The width of the column spacer is smaller than the width of the black matrix. The method of claim 1,
The color mixing prevention part and the column spacer are provided on different substrates. delete Forming a gate line and a data line on the lower substrate;
Forming a black matrix and an overcoat layer on the upper substrate;
Forming a color mixing prevention part on the overcoat layer;
Forming a column spacer between the upper and lower substrates;
Forming a liquid crystal on the lower substrate; And
Including the step of bonding the lower substrate and the upper substrate,
The color mixing prevention part is formed to overlap with the data line,
The column spacer is made of a bar structure extending in the length direction of the gate line,
The column spacer is a method of manufacturing a liquid crystal display panel in which the column spacer is disposed to overlap both the data line and the gate line at a position where the data line and the gate line cross each other. The method of claim 16,
The height of the color mixing prevention part,
A method of manufacturing a liquid crystal display panel formed to be smaller than a cell gap between the lower substrate and the upper substrate. The method of claim 16,
A method of manufacturing a liquid crystal display panel in which the color mixing prevention part is formed at the same time as the column spacer. The method of claim 16,
The method of manufacturing a liquid crystal display panel in which the color mixing prevention part and the column spacer are formed on different substrates.

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