KR102272900B1 - Liquid crystal display panel, manufacturing method thereof and display device comprising the same - Google Patents

Abstract

The present invention relates to a liquid crystal display panel, a method of manufacturing the same, and a display device including the same, wherein the liquid crystal display panel includes a first substrate and a second substrate and a liquid crystal layer interposed between the first and second substrates. . In this case, the first substrate includes a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor provided in each pixel area, and a column spacer stopper formed on the gate line. do. In addition, the second substrate includes a black matrix having a plurality of openings at positions corresponding to the respective pixel areas, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer. Meanwhile, the column spacer stopper and the column spacer are arranged along the extension direction of the data line, and the column spacer stopper is provided at one side of the contact portion between the column spacer and the second substrate.

Description

Liquid crystal display panel, manufacturing method therefor, and display device including same {LIQUID CRYSTAL DISPLAY PANEL, MANUFACTURING METHOD THEREOF AND DISPLAY DEVICE COMPRISING THE SAME}

The present invention relates to a liquid crystal display panel and a manufacturing method thereof, and more particularly, to a liquid crystal display panel in which red eye phenomenon in an ultra-thin, high-resolution liquid crystal display device due to shift of a column spacer is improved. and to a method for manufacturing the same.

The liquid crystal display is configured by filling liquid crystals between an array substrate and a color filter substrate spaced apart from each other by a predetermined distance. Since the filled liquid crystal has optical anisotropy and polarization properties, it is driven by a change in an electric field generated when a voltage is applied to two electrodes facing each other. The liquid crystal has a directionality in molecular alignment because of its long and thin structure, and the direction of molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal. Therefore, if the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal by optical anisotropy to express image information.

On the other hand, the liquid crystal display device as described above generally includes a spacer between the upper substrate and the lower substrate in order to maintain the gap of the liquid crystal cell. Conventionally, a ball-type spacer has been mainly used as the spacer, but recently, a column spacer manufactured by patterning a photosensitive material in a black matrix region of a color filter substrate is mainly used. The column spacer has the advantage of being easy to apply to a large area substrate and simple to manufacture. However, recently, as the substrate of the liquid crystal display becomes thinner and the substrate tends to warp due to the touch function, a shift phenomenon of the column spacer occurs, which causes damage to the alignment film, and liquid crystal in the damaged portion of the alignment film. There is a problem in that light leakage occurs due to improper alignment. 1 is a photograph showing a state in which light leakage is generated due to shift of the column spacer.

In order to solve the above problem, as shown in FIG. 2 , a technique for increasing the line width of the black matrix in the region where the column spacer is formed has been proposed. However, in this method, there is a problem in that the aperture ratio is lowered because a margin of 12 μm or more from the column spacer to the end of the black matrix is required to prevent light leakage. Therefore, the above method is not suitable for being applied to an ultra-thin, ultra-high-resolution model. In addition, a periodic pattern is formed in the black matrix due to an increase in the line width of the black matrix in the region where the column spacer is formed, and the pattern of the black matrix and the pixel pattern are overlapped to generate moiré, thereby degrading image quality. .

The present invention is to solve the above problems, a liquid crystal display panel developed to prevent light leakage due to column spacer shift while minimizing an increase in the line width of a black matrix in a region where a column spacer is formed, a method for manufacturing the same, and An object of the present invention is to provide a liquid crystal display including the same.

According to one embodiment, the present invention provides a liquid crystal display panel. A liquid crystal display panel according to the present invention includes a first substrate and a second substrate, and a liquid crystal layer interposed between the first and second substrates. In this case, the first substrate includes a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor provided in each pixel area, and a column spacer stopper formed on the gate line. do. In addition, the second substrate includes a black matrix having a plurality of openings at positions corresponding to the respective pixel areas, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer. Meanwhile, the column spacer stopper and the column spacer are arranged along the extension direction of the data line, and the column spacer stopper is provided at one side of the contact portion between the column spacer and the second substrate.

According to another embodiment, the present invention provides a method of manufacturing a liquid crystal display panel. A method of manufacturing a liquid crystal display panel according to the present invention comprises: a first substrate including a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor and a column spacer stopper provided in each pixel area; forming a second substrate including a black matrix having a plurality of openings at positions corresponding to the respective pixel regions, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer; forming a liquid crystal layer; bonding the first and second substrates; and injecting liquid crystals between the first and second substrates. In this case, the column spacer stopper and the column spacer are formed to be arranged along the extension direction of the data line, and the column spacer stopper is formed to be provided on one side of the contact portion between the column spacer and the second substrate.

According to another embodiment, the present invention provides a liquid crystal display device. A liquid crystal display device according to the present invention includes a liquid crystal display panel and a backlight unit disposed under the liquid crystal display panel. In this case, the liquid crystal display panel includes a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor provided in each pixel area, and a column spacer stopper formed on the gate line. a first substrate, a black matrix having a plurality of openings at positions corresponding to the respective pixel regions, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer; and a liquid crystal layer interposed between the first substrate and the second substrate, wherein the column spacer stopper and the column spacer are arranged along the extension direction of the data line, and the column spacer stopper is the column spacer and the second substrate. is provided on one side of the contact portion of the

The liquid crystal display panel according to the present invention is provided with a column spacer stopper capable of suppressing movement on one side of the column spacer to minimize damage to the alignment layer due to movement of the column spacer.

In addition, in the liquid crystal display panel according to the present invention, by forming the column spacer stopper on only one side of the column spacer, the increase in the black matrix line width in the area where the column spacer is formed can be minimized.

In addition, in the liquid crystal display panel according to the present invention, the column spacer stopper disposed on the n-th gate wiring and the column spacer stopper disposed on the n+1-th gate wiring are formed to be opposite to each other with respect to the column spacer. , so that the column spacer shift can be effectively suppressed with the minimum number of stoppers.

In addition, in the liquid crystal display panel according to the present invention, when the column spacer stopper is formed on the same layer as the touch wiring, there is no need to perform a separate column spacer stopper forming process by forming the column spacer stopper together when the touch wiring is formed. There are advantages.

1 is a photograph showing a state in which light leakage (red eye) occurs due to column spacer shift in a conventional liquid crystal display device.
2 is a view showing a black matrix arrangement state of a conventional liquid crystal display panel.
3 is a cross-sectional view of a pixel area of a liquid crystal display panel according to the present invention.
4 is a view for explaining the arrangement relationship of the column spacer stopper in the liquid crystal display panel according to the present invention.
5 is a cross-sectional view taken along line A-A' of FIG. 4 .
6 is a diagram illustrating an embodiment of a display device according to the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the following drawings and embodiments are merely examples for allowing the spirit of the present invention to be sufficiently conveyed to those skilled in the art, and the present invention is not limited by the following drawings and embodiments.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings below are exemplary, and thus the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if 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 'including', 'having', 'consisting', 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 case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, when the temporal relationship is described as 'after', 'following', 'after', 'before', etc., 'immediately' or 'directly' This includes cases that are not continuous unless ' is used.

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

Characteristic parts of each of the various embodiments of the present invention may be partially or wholly 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 in a related relationship. It can also be done together.

The present inventors have repeatedly studied to find a way to prevent light leakage due to shift of the column spacer while minimizing the line width of the black matrix so that it can be applied to an ultra-thin, ultra-high-resolution liquid crystal display. By forming the column spacer stopper in a specific arrangement, it was found that the above object can be achieved, and the present invention has been completed.

3 to 5 are views for explaining the liquid crystal display panel according to the present invention. 3 is a cross-sectional view of a pixel area of a liquid crystal display panel according to the present invention, FIG. 4 is a view for explaining the arrangement relationship of column spacer stoppers, and FIG. 5 is a cross-sectional view taken along line A-A' of FIG. . 3 to 5, the liquid crystal display panel of the present invention comprises a first substrate 110, a second substrate 130, and a liquid crystal layer 120 interposed between the first and second substrates. include

In this case, a gate line 310 and a data line 320 are disposed on one surface of the first substrate to cross each other perpendicularly with a gate insulating layer 352 interposed therebetween to define a pixel region P. A thin film transistor (TFT) is provided in the pixel region P, and the thin film transistor is connected to the pixel electrode 357 provided in each pixel region through a contact hole formed in the insulating layer 356 . That is, the first substrate 301 may be referred to as a thin film transistor substrate.

The thin film transistor TFT includes a gate electrode 351 , a gate insulating layer 352 , a semiconductor layer 353 , a source electrode 354 , and a drain electrode 355 . Also, although the drawing shows a bottom gate structure in which the gate electrode 351 of the thin film transistor is disposed under the semiconductor layer 353, the structure is not limited thereto, and the gate electrode 351 is It may be formed as a top gate structure disposed on the semiconductor layer 353 . In addition, various changes and modifications are possible to the configuration of the thin film transistor without departing from the technical spirit of the present invention.

Meanwhile, as shown in FIG. 5 , a column spacer stopper 420 is provided on the first substrate 110 . In this case, the column spacer stopper 420 is formed on the gate wiring 310 and is provided on one side of the contact portion 412 between the column spacer 410 and the second substrate. When the column spacer stopper 420 is formed on one side of the column spacer 410 as in the present invention, light leakage due to column spacer shift can be effectively prevented even in a black matrix having a narrow line width. Specifically, when the conventional column spacer stopper 420 is not provided, the red eye does not occur when the margin of the black matrix is 12 μm or more. However, when the stopper is formed on one side of the column spacer as in the present invention, the black matrix Red eye does not occur even if the margin of 10㎛ or less, preferably only about 6-7㎛ secure. Meanwhile, the margin (M) refers to a distance from the end of the column spacer to the end of the black matrix, as shown in FIG. 5 .

On the other hand, when the column spacer stoppers 420 are provided on both sides of the column spacer 410 , the black matrix 371 must be formed so as to cover both the formation area of the column spacer 410 and the column spacer stopper 420 . Therefore, there is no effect of reducing the line width of the black matrix.

Meanwhile, in the present invention, the column spacer stopper 420 and the column spacer 410 are arranged along the extension direction of the data line 320 as shown in FIG. 4 . More specifically, when the extension direction of the data line 320 is referred to as a vertical direction and the extension direction of the gate line 210 is referred to as a horizontal direction, the column spacer stopper 420 is the contact portion 412 between the column spacer and the second substrate. ) may be formed on the upper side or the lower side in the vertical direction. In the horizontal direction, there is no need to control the movement in the horizontal direction because the black matrix having a wide line width is continuous, so that no light leakage occurs when the column spacer 410 moves in the horizontal direction even if the column spacer 410 is moved by an external force You only need to control the movement to . Accordingly, in the present invention, by arranging the column spacer stopper 420 and the column spacer 410 along the extension direction of the data line 320 , vertical movement of the column spacer 410 can be suppressed.

Further, as shown in FIG. 4 , the column spacer stopper disposed on the n-th gate wiring and the column spacer stopper disposed on the n+1-th gate wiring are preferably opposite to each other with respect to the column spacer . For example, the column spacer stopper may be formed above the column spacer contact portion on the even-numbered gate line and below the column spacer contact portion on the odd-numbered gate line. Alternatively, it may be formed under the column spacer contact on the even-numbered gate wiring and above the column spacer contact on the odd-numbered gate wiring. When the column spacer stopper is disposed as described above, even when the stopper is formed on only one side of the column spacer, when the substrate is bent, the movement of the column spacer can be effectively suppressed.

Meanwhile, the height of the column spacer stopper 420 may be 400 nm or more, preferably about 400 nm to 1000 nm. This is because, when the height of the column spacer stopper 420 is less than 400 nm, the column spacer may move over the stopper 420 when an external force is generated.

Meanwhile, the first substrate 110 may further include a touch electrode layer including a touch wire 440 for touch sensing. In this case, the touch electrode layer may be formed by depositing a metal layer on the insulating layer 356 of the thin film transistor and then patterning it. Meanwhile, the touch wire 440 may be formed of a metal wire. In this case, the touch wire 440 is preferably disposed on the data wire 320 . This is because, when the touch wire 440 is disposed on the data wire 320 , there is no need to additionally form a black matrix to cover the touch wire 440 .

Meanwhile, in the present invention, the column spacer stopper 420 may be made of the same material as the touch wiring 440 and formed on the same layer. In this case, the manufacturing process may be simplified by patterning the column spacer stopper 420 together in the touch wiring patterning process.

Meanwhile, an inorganic insulating layer 440 made of silicon oxide or silicon nitride may be formed on the touch wiring 440 and the column spacer stopper 420 to insulate it from the pixel electrode.

Next, on one surface of the second substrate 130 of the liquid crystal display panel, a plurality of positions corresponding to the respective pixel regions while covering the non-display region in which the thin film transistors (TFTs) of the first substrate 110 are disposed A lattice-shaped black matrix 371 having openings in is formed. In addition, R (red), G (green), and B (blue) color filter layers 372 , which are sequentially and repeatedly arranged to correspond to each pixel area, and a transparent common electrode 373 covering them all are included in the openings . That is, the second substrate 302 may be a color filter substrate.

Meanwhile, a column spacer 410 is provided under the color filter layer 372 . The column spacer 410 is used to maintain a gap between the first substrate and the second substrate, and is formed in an area covered by the black matrix 371 . The column spacers 410 are formed to have a length capable of maintaining a gap between the first and second substrates by contacting the first and second substrates after bonding.

Next, the liquid crystal layer 120 is interposed between the first substrate 110 and the second substrate 130 , and is common between the liquid crystal layer 120 and the pixel electrode 357 and the liquid crystal layer 120 . A first alignment layer 358 and a second alignment layer 374 are interposed between the electrodes 373 , respectively. The first alignment layer 358 and the second alignment layer 374 may uniformly align the initial alignment state and alignment direction of the liquid crystal molecules.

However, the drawings are simplified illustrations of the liquid crystal display panel according to the present invention, and are not limited thereto. For example, although one thin film transistor is represented in the drawing, the thin film transistor may be composed of a combination of one or more thin film transistors depending on the characteristics of operation.

In addition, the method for controlling the arrangement of liquid crystal molecules can be variously applied to a twisted nematic (TN) mode and a vertical alignment (VA) mode, as well as an IPS (In Plane Switching) mode or FFS (Fringe Field Switching) mode. Accordingly, in the drawing, the pixel electrode 357 is formed on the first substrate 110 and the common electrode 373 is formed on the second substrate 130 , but the pixel electrode 357 and the common electrode 373 are illustrated. ) may be changed or modified. In an In Plane Switching (IPS) mode or a Fringe Field Switching (FFS) mode, the pixel electrode 357 and the common electrode 373 may be formed on the first substrate 110 .

In addition, in the liquid crystal display panel 300 , a thin film transistor, a color filter layer, and a black matrix are formed on a first substrate 110 , and a second substrate 130 has a liquid crystal layer 120 interposed therebetween. 110) and may be a liquid crystal display panel having a color filter on transistor (COT) structure. That is, a thin film transistor may be formed on the first substrate 110 , a protective film may be formed on the thin film transistor, and a color filter layer may be formed on the protective film. In addition, a pixel electrode in contact with the thin film transistor is formed on the first substrate 110 . In this case, in order to improve the aperture ratio and simplify the mask process, the black matrix may be omitted, and the common electrode may also serve as the black matrix.

That is, the liquid crystal display panel is not limited to the representation of the drawings, and various changes and modifications are possible without departing from the technical spirit of the present invention.

Next, a method for manufacturing the liquid crystal display panel of the present invention will be described. A method of manufacturing a liquid crystal display panel of the present invention includes forming a first substrate, forming a second substrate, bonding the first substrate and the second substrate, and forming a liquid crystal layer.

In this case, the first substrate includes a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor and a column spacer stopper provided in each pixel area.

To form the first substrate as described above, first, a gate line, a data line, and a thin film transistor are formed on the first substrate. In this case, the method of forming the gate wiring, the data wiring, and the thin film transistor may be performed using a thin film transistor formation method well known in the art. For example, a conductive metal is deposited on the first substrate and patterned using a mask process to form a gate line and a gate electrode protruding from the gate line.

Then, a gate insulating film is formed on the substrate on which the gate wiring and the gate electrode are formed, and a semiconductor layer is formed on the gate insulating film. Then, a conductive metal is deposited on the semiconductor layer and patterned using a mask process or the like to form a source electrode, a drain electrode, and a data line.

Then, an insulating layer is formed on the gate wiring, the data wiring, and the thin film transistor, and a conductive metal is deposited on the insulating layer to form a metal layer. Then, the metal layer is patterned using a mask process or the like to form touch wirings and column spacer stoppers. In this case, the column spacer stopper is formed in an upper region of the gate wiring and is provided at one side of the contact portion between the column spacer and the second substrate.

When the touch wiring and the column spacer stopper are formed, an inorganic insulating layer is formed on the touch wiring and the column spacer stopper. In this case, the inorganic insulating layer is formed by depositing an inorganic insulating material such as silicon oxide or silicon nitride. Then, the insulating layer and the inorganic insulating layer are etched using a mask process to form a contact hole exposing the drain electrode of the thin film transistor. When the contact hole is formed, a transparent conductive metal such as ITO is deposited and then patterned to form a pixel electrode.

Meanwhile, the second substrate includes a black matrix having a plurality of openings at positions corresponding to respective pixel areas, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer.

In order to form the second substrate as described above, first, a black matrix having a plurality of openings at positions corresponding to each pixel area is formed on the second substrate. In this case, the black matrix may be formed using a method for forming a black matrix well known in the art. For example, after coating a photosensitive black organic material on a second substrate, selectively light using an exposure mask. It can be formed through a method of irradiating and then developing.

When the black matrix is formed in the above manner, a color filter layer in which red, green, and blue color filters are alternately arranged is formed in the opening of the black matrix. In this case, the color filter layer may be formed using a method for forming a color filter layer well known in the art, for example, after applying a photopolymerizable photosensitive composition containing a pigment, selectively exposing using an exposure mask, It can be formed through a developing method.

After the color filter layer is formed, column spacers are formed under the color filter layer. In this case, the color spacer may be formed, for example, by applying a photosensitive organic material on the color filter layer, then selectively exposing and developing the photosensitive organic material using an exposure mask.

Meanwhile, when the common electrode is provided on the second substrate, a common electrode forming process is performed before the column spacer is manufactured. In this case, the common electrode may be formed by depositing a transparent conductive metal material such as ITO and then patterning.

When the first substrate and the second substrate are formed through the above method, an alignment layer is formed by applying an alignment material on the first substrate and the second substrate and then aligning the substrate.

Then, after bonding the first and second substrates using a seal pattern or the like, a liquid crystal material is injected to form a liquid crystal layer, thereby manufacturing a liquid crystal display panel.

According to the above method, since the column spacer stopper is formed together when the touch wiring is formed, there is an advantage in that there is no need to perform a separate column spacer stopper forming process.

Next, the display device of the present invention will be described. 6 shows an embodiment of a display device of the present invention. As shown in FIG. 6 , the display device of the present invention includes a backlight unit 200 and a liquid crystal display panel 100 . Since the contents of the liquid crystal display panel are the same as described above, only the backlight unit will be described herein.

In this case, the backlight unit 200 is for providing light to the display panel 100 , and includes the light source unit 240 including a plurality of light sources 240b and the light conversion film 270 of the present invention. It is characterized by In addition, the backlight unit 200 may further include a bottom case 210 , a reflection plate 220 , a light guide plate 230 , a guide panel 250 , an optical sheet 260 , and the like, if necessary. Since the specific content of the light conversion film 270 has been described above, other components of the backlight unit will be described herein.

First, the light source unit 240 is for providing light to the display panel 100 and may be disposed inside the bottom case 210 .

The light source unit 240 includes, for example, a plurality of light sources 240b and a printed circuit board 240a on which the plurality of light sources 240b are mounted. In this case, the light source 240b may be, for example, a light emitting diode.

Meanwhile, the printed circuit board 240a is electrically connected to the light source 240b. The light source 240b may be driven by receiving a driving signal through the printed circuit board 240a.

The printed circuit board 240a has a mounting surface on which the light source 240b is mounted and an adhesive surface facing the mounting surface. The adhesive surface of the printed circuit board 240a is attached to the bottom case 210 . The printed circuit board 240a may be disposed on one side of the bottom case 210 in a bar shape.

Although the drawing shows a configuration in which the printed circuit board 240a is attached to the inner side surface of the bottom case 210, the present invention is not limited thereto. The printed circuit board 240a may be attached to the inner upper surface of the bottom case 210 or to the lower surface of the bent extension part 211 of the bottom case 210 .

Although the drawing shows a configuration in which the light source unit 240 is disposed on one side of the bottom case 210 , the present invention is not limited thereto, and the light source unit 240 is disposed on both sides facing each other inside the bottom case 210 . may be placed. Also, although the edge type backlight unit 200 is illustrated in the drawing, the backlight unit 200 may be a direct type backlight unit 200 . That is, the light source unit 240 may be disposed on the inner upper surface of the bottom case 210 .

Meanwhile, the bottom case 210 has an open top shape. In addition, the bottom case 210 has sidewalls extending in a closed curve shape to accommodate the light source unit 240 , the light guide plate 230 , the reflection plate 220 , and the optical sheet 260 . In this case, at least one sidewall of the bottom case 210 may be provided with a bent extension portion 211 that extends from the upper edge to cover the light source unit 240 . That is, a cross-section of one side of the bottom case 210 may have a 'c' shape. In this case, a reflective member 243 may be further disposed on the lower surface of the bent extension part 211 .

The reflective member 243 may be a light source housing, a reflective film, or a reflective tape. The reflective member 243 may prevent light from the light source unit 240 from being directly emitted to the display panel 100 . Also, the reflective member 243 may increase the amount of light incident into the light guide plate 230 . Accordingly, the reflective member 243 may improve optical efficiency, luminance, and image quality of the display device.

Meanwhile, in the bottom case 210 , the bent extension part 211 may be omitted. That is, a cross-section of one side of the bottom case 210 may have the shape of an 'B'. The bottom case 210 is coupled to the guide panel 250 .

The guide panel 250 includes an inner protrusion. The display panel 100 may be seated and supported on the protrusion of the guide panel 250 . The guide panel 250 may be referred to as a main support or a mold frame.

The guide panel 250 is disposed to surround an edge of the backlight unit 200 to be bonded to the display panel 100 . That is, the guide panel 250 has a frame shape. For example, the guide panel 250 may have a rectangular frame shape. Also, the guide panel 250 may have an opening in a region corresponding to the bent extension portion 211 of the bottom case 210 .

Although not shown in the drawings, the bottom case 210 and the guide panel 250 may be assembled to include a hook shape, respectively, or may be assembled and fastened to include a protrusion and a recess, respectively. In addition, the bottom case 210 and the guide panel 250 may be bonded through an adhesive member.

However, the drawings are not limited thereto, and the guide panel 250 may be disposed on the light source unit 240 . In this case, a reflective member 243 may be disposed on a lower surface of the guide panel 250 corresponding to the light source unit 240 .

Next, the light guide plate 230 uniformly guides the light provided from the light source unit 240 to the liquid crystal display panel 100 through total reflection, refraction, and scattering. Here, the light guide plate 230 is accommodated in the bottom case 210 .

Although the light guide plate 230 is illustrated to have a constant thickness in the drawings, the shape of the light guide plate 230 is not limited thereto. For example, the thickness of the light guide plate 230 may be formed thinner in the central portion than both sides of the light guide plate 230 in order to reduce the overall thickness of the backlight unit 200 , and become thinner as it moves away from the light source unit 240 . You may.

In addition, in order to supply a uniform surface light source, one surface of the light guide plate 230 may include a pattern having a specific shape. For example, the light guide plate 230 may include various patterns, such as an elliptical pattern, a polygon pattern, and a hologram pattern, in order to guide light incident therein. .

In the drawing, the light source unit 240 is disposed on a side surface of the light guide plate 230 , but is not limited thereto. The light source unit 240 may be disposed to correspond to at least one surface of the light guide plate 230 . For example, the light source unit 240 may be disposed to correspond to one or both sides of the light guide plate 230 , and the light source unit 240 may be disposed to correspond to a lower surface of the light guide plate 230 . have.

The reflective plate 220 is disposed in a path of the light emitted from the light source unit 240 . In detail, the reflection plate 220 is disposed between the light guide plate 230 and the bottom case 210 . That is, the reflective plate 220 is disposed under the light guide plate 230 . The reflector 220 may serve to increase light efficiency by reflecting the light propagating toward the upper surface of the bottom case 210 to the light guide plate 230 .

Unlike the drawing, when the light source unit 240 is disposed to correspond to the lower surface of the light guide plate 230 , the reflection plate 220 may be disposed on the light source unit 240 . In detail, the reflection plate 220 is disposed on the printed circuit board 240a of the light source unit 240 . Also, the optical member 220 may include a plurality of holes through which the plurality of light sources 240b may be coupled.

That is, the plurality of light sources 240b may be inserted into the plurality of holes of the reflector 220 , and the light sources 240b may be exposed to the outside through the holes. For this reason, the reflector 220 may be disposed on the printed circuit board 240a on the side of the light source 240b.

An optical sheet 260 for diffusion and light collection is disposed on the light guide plate 230 . For example, the optical sheet 260 may include a diffusion sheet 261 , a first prism sheet 262 , and a second prism sheet 263 .

The diffusion sheet 261 is disposed on the light guide plate 230 . The diffusion sheet 261 improves the uniformity of the light passing therethrough. The diffusion sheet 261 may include a plurality of beads.

The first prism sheet 262 is disposed on the diffusion sheet 261 . The second prism sheet 263 is disposed on the first prism sheet 262 . The first prism sheet 262 and the second prism sheet 263 increase the straightness of the passing light. Accordingly, the light emitted onto the light guide plate 230 may pass through the optical sheet 260 to be processed into a surface light source with higher luminance.

100: liquid crystal display panel 110: first substrate
120: liquid crystal layer 130: second substrate
200: backlight unit
410: column spacer 420: column spacer stopper
440: touch wiring

Claims (11)

a first substrate comprising: a first substrate including a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor provided in each pixel area, and a column spacer stopper formed on the gate line;
a black matrix having a plurality of openings at positions corresponding to the respective pixel regions and overlapping the gate wirings and the data wirings; a color filter layer provided in the openings; and at least one column spacer provided under the color filter layer; a second substrate including; and
a liquid crystal layer interposed between the first substrate and the second substrate;
the column spacer stopper and the column spacer are arranged on the gate line and the data line in a region where the gate line and the data line intersect;
In a portion of the black matrix that overlaps with the gate line, a line width in an extension direction of the gate line is greater than a line width in an extension direction of the data line;
In the gate wiring, a first gate wiring and a second gate wiring are alternately disposed,
the column spacer stopper disposed on the first gate line is disposed only above the column spacer in a plan view;
the column spacer stopper disposed on the second gate line is disposed only below the column spacer in a plan view;
and the column spacer stopper is provided at one side of a contact portion between the column spacer and the second substrate.
delete According to claim 1,
A height of the column spacer stopper is 400 nm to 1000 nm.
According to claim 1,
The first substrate is a liquid crystal display panel including a touch electrode layer for sensing a touch.
5. The method of claim 4,
The touch electrode layer includes a touch wire disposed on the data wire.
6. The method of claim 5,
The column spacer stopper is formed on the same layer as the touch wiring.
According to claim 1,
A liquid crystal display panel having a distance from the end of the column spacer to the end of the black matrix of 10 μm or less.
forming a first substrate including a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor and a column spacer stopper provided in each of the pixel areas;
forming a second substrate including a black matrix having a plurality of openings at positions corresponding to the respective pixel areas, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer;
bonding the first and second substrates together; and
Forming a liquid crystal layer between the first substrate and the second substrate,
the column spacer stopper and the column spacer are formed to be arranged on the gate line and the data line in a region where the gate line and the data line intersect;
In a portion of the black matrix that overlaps with the gate line, a line width in an extension direction of the gate line is greater than a line width in an extension direction of the data line;
In the gate wiring, a first gate wiring and a second gate wiring are alternately disposed,
the column spacer stopper disposed on the first gate line is disposed only above the column spacer in a plan view;
the column spacer stopper disposed on the second gate line is disposed only below the column spacer in a plan view;
The column spacer stopper is formed to be provided on one side of a contact portion between the column spacer and the second substrate.
9. The method of claim 8,
Forming the first substrate comprises:
forming a gate line, a data line, and a thin film transistor on a first substrate;
forming an insulating layer on the gate line, the data line, and the thin film transistor;
forming a metal layer on the insulating layer;
forming a touch wiring and a column spacer stopper by patterning the metal layer;
forming an inorganic insulating layer on the touch wiring and the column spacer stopper;
forming a contact hole exposing the drain electrode of the thin film transistor; and
A method of manufacturing a liquid crystal display panel comprising the step of forming a pixel electrode.
9. The method of claim 8,
Forming the second substrate comprises:
forming a black matrix having a plurality of openings at positions corresponding to respective pixel areas on a second substrate;
forming a color filter layer in the opening; and
and forming column spacers under the color filter layer.
A display device comprising a liquid crystal display panel and a backlight unit disposed under the liquid crystal display panel,
The liquid crystal display panel includes a plurality of gate lines and data lines arranged vertically to define a pixel area, a thin film transistor provided in each pixel area, and a column spacer stopper formed on the gate line. 1 substrate;
a second substrate including a black matrix having a plurality of openings at positions corresponding to the respective pixel areas, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layer; and
a liquid crystal layer interposed between the first substrate and the second substrate, wherein the column spacer stopper and the column spacer are arranged on the gate line and the data line in a region where the gate line and the data line intersect;
In a portion of the black matrix that overlaps with the gate line, a line width in an extension direction of the gate line is greater than a line width in an extension direction of the data line;
In the gate wiring, a first gate wiring and a second gate wiring are alternately disposed;
the column spacer stopper disposed on the first gate line is disposed only above the column spacer in a plan view;
the column spacer stopper disposed on the second gate line is disposed only below the column spacer in a plan view;
and the column spacer stopper is provided at one side of a contact portion between the column spacer and the second substrate.

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