KR20160094566A - 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 for manufacturing the same, and a display device including the same. The liquid crystal display panel includes a first substrate, a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. At this time, the first substrate includes a plurality of gate lines and data lines that are arranged perpendicular to each other and define a pixel area, a thin film transistor that is provided in the pixel area, and a column spacer stopper that is formed on the gate lines. Further, the second substrate includes: a black matrix having a plurality of openings situated at a location corresponding to the pixel area, a color filter layer that is provided in the openings, and at least one column spacer that is provided below the color filter layer. Meanwhile, the column spacer stopper and the column spacer are arranged in an extending direction of the data lines, and the column spacer stopper and the column spacer are provided on one side of a contact part of the second substrate. The liquid crystal display panel according to the present invention includes a column spacer stopper that is located on one side of a column spacer to suppress movement thereof, so that damage to an alignment film resulting from movement of the column spacer may be minimized.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal display panel, a method of manufacturing the same, and a display device including the liquid crystal display panel.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method of manufacturing the same, and more particularly, to a liquid crystal display panel having improved red eye phenomenon in an ultra-thin and high resolution liquid crystal display device due to a shift of a column spacer. And a manufacturing method thereof.

A liquid crystal display device is constituted by filling a liquid crystal between an array substrate spaced at a predetermined distance and a color filter substrate. The filled liquid crystal has optical anisotropy and polarization properties and is driven by a change in an electric field generated when a voltage is applied to two opposing electrodes. Since liquid crystals are thin and long, they have directionality in molecular orientation and can control the direction of molecular arrangement by artificially applying electric field to liquid crystal. Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal by optical anisotropy, so that image information can be expressed.

Meanwhile, the liquid crystal display device as described above generally includes a spacer between the upper substrate and the lower substrate to maintain the gap of the liquid crystal cell. Conventionally, a ball type spacer is mainly used as the spacer, but 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 is advantageous in that it is easy to apply to a large area substrate and is simple in manufacturing. In recent years, however, the substrate of a liquid crystal display has become thinner, and warpage is likely to occur due to a touch function or the like. As a result, a shift phenomenon of the column spacer occurs and thereby the alignment film is damaged. There arises a problem that light leakage occurs because the array is not properly formed. FIG. 1 is a photograph showing a state where light leakage is generated due to a shift of a column spacer.

In order to solve the above problem, there has been proposed a technique for increasing the line width of the black matrix in the region where the column spacer is formed as shown in Fig. However, in this method, since the margin from the column spacer to the end of the black matrix is required to be 12 占 퐉 or more in order to prevent light leakage, there is a problem that the aperture ratio is lowered. Therefore, the above method is unsuitable for application to ultra-thin, ultra-high resolution models. In addition, a periodic pattern is formed in the black matrix by increasing the line width of the black matrix in the region where the column spacer is formed, and a problem occurs in that the pattern of the black matrix overlaps with the pixel pattern to generate moiré to lower the image quality .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a liquid crystal display panel which is capable of preventing light leakage caused by a column spacer shift while minimizing a line width of a black matrix in a region where a column spacer is formed, And a liquid crystal display device 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, a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. The first substrate includes a plurality of gate wirings and data wirings arranged perpendicular to each other to define pixel regions, a thin film transistor provided in each pixel region, and a column spacer stopper formed on the gate wirings do. The second substrate includes a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the opening, and at least one or more column spacers disposed under the color filter layer. The column spacer stopper and the column spacer are arranged along the extending direction of the data line, and the column spacer stopper is provided at one side of the contact portion of 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 is a method of manufacturing a liquid crystal display panel including a plurality of gate wirings and data wirings arranged vertically to define pixel regions, a first substrate having thin film transistors and column spacer stoppers provided in the respective pixel regions, And a second substrate including a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the opening, and at least one or more column spacers provided under the color filter layer, Forming a liquid crystal layer between the first substrate and the second substrate; and injecting liquid crystal between the first substrate and the second substrate to form a liquid crystal layer. At this time, the column spacer stopper and the column spacer are formed to be arranged along the extending direction of the data line, and the column spacer stopper is formed on one side of the contact portion of 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. The liquid crystal display panel includes a plurality of gate wirings and data wirings arranged vertically to define pixel regions, a thin film transistor provided in each pixel region, and a column spacer stopper formed on the gate wirings A second substrate including a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the opening, 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 extending direction of the data line, and the column spacer stopper includes the column spacer and the second substrate As shown in Fig.

The liquid crystal display panel according to the present invention includes a column spacer stopper which can prevent movement of the column spacer on one side of the column spacer, thereby minimizing damage to the alignment film due to movement of the column spacer.

In the liquid crystal display panel according to the present invention, the column spacer stopper is formed only on one side of the column spacer, thereby minimizing the increase in the line width of the black matrix in the region where the column spacer is formed.

Also, in the liquid crystal display panel according to the present invention, the column spacer stoppers disposed on the n-th gate wiring and the column spacer stoppers disposed on the (n + 1) -th gate wiring are formed so that their arrangement positions are opposite to each other with respect to the column spacer , The column spacer shift can be effectively suppressed by 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, it is not necessary to form a column spacer stopper together with the column spacer stopper during the formation of the touch wiring, There are advantages.

FIG. 1 is a photograph showing a state where light leakage (red eye) occurs due to a 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 region of the liquid crystal display panel of the present invention.
4 is a view for explaining the arrangement relationship of the column spacer stoppers in the liquid crystal display panel according to the present invention.
5 is a cross-sectional view taken along the line A-A 'in FIG.
6 is a diagram showing 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 a person skilled in the art to sufficiently convey the spirit of the present invention, and the present invention is not limited by the following drawings and embodiments.

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

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

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

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

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'Is not used and is not contiguous.

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

It is to be understood that each characteristic portion of the various embodiments of the present invention may be partially or wholly combined or combinable with each other and technically various interlocking and driving are possible and that each implementation may be feasible independently of each other, It can be done together.

The inventors of the present invention have conducted research to find a method of preventing light leakage due to shift of a column spacer while minimizing the line width of a black matrix so as to be applicable to an ultra-thin and ultra-high resolution liquid crystal display device. And the column spacer stopper is formed into a specific arrangement, the present invention has been accomplished.

3 to 5 are views for explaining a liquid crystal display panel according to the present invention. FIG. 3 is a cross-sectional view of a pixel region of a liquid crystal display panel according to the present invention, FIG. 4 is a view for explaining an arrangement relationship of a column spacer stopper, and FIG. 5 is a cross- . 3 to 5, the liquid crystal display panel of the present invention includes a first substrate 110, a second substrate 130, and a liquid crystal layer 120 interposed between the first substrate and the second substrate. .

At this time, a gate line 310 and a data line 320 are arranged on one surface of the first substrate so as to cross each other with a gate insulating layer 352 interposed therebetween to define a pixel region P. The pixel region P is provided with a thin film transistor (TFT), which is connected to the pixel electrode 357 provided in each pixel region and the 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 film 352, a semiconductor layer 353, a source electrode 354, and a drain electrode 355. Although the bottom gate structure in which the gate electrode 351 of the thin film transistor is disposed below the semiconductor layer 353 is shown in the drawing, the structure is not limited thereto, and the gate electrode 351 And a top gate structure disposed on the semiconductor layer 353. In addition, the configuration and the like of the thin film transistor can be variously modified and modified within a range not departing from the technical idea of the present invention.

On the first substrate 110, a column spacer stopper 420 is provided as shown in FIG. At this time, the column spacer stopper 420 is formed on the gate wiring 310 and is provided on one side of the contact portion 412 of 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 the column spacer shift can be effectively prevented even in a black matrix having a narrow line width. Specifically, in the case where the conventional column spacer stopper 420 is not provided, the margin of the black matrix must be 12 μm or more to cause no red eye. However, when a stopper is formed on one side of the column spacer as in the present invention, Even if a margin of 10 占 퐉 or less, preferably about 6 to 7 占 퐉, is secured, red eye does not occur. Meanwhile, the margin (M) is the distance from the end of the column spacer to the end of the black matrix, as shown in FIG.

When a column spacer stopper 420 is provided on both sides of the column spacer 410, a black matrix 371 should be formed to cover the formation area of the column spacer 410 and the column spacer stopper 420 Therefore, the line width of the black matrix is not reduced.

Meanwhile, in the present invention, the column spacer stopper 420 and the column spacer 410 are arranged along the extending direction of the data line 320, as shown in FIG. More specifically, assuming that the extending direction of the data line 320 is the vertical direction and the extending direction of the gate wiring 210 is the horizontal direction, the column spacer stopper 420 contacts the column spacer and the second substrate contact portion 412 In the vertical direction. Even if the column spacer 410 moves due to an external force, since the black matrix having a wide line width is continuous in the horizontal direction, no light leakage occurs when the column spacer 410 moves in the horizontal direction, so that it is not necessary to control the movement in the horizontal direction, As shown in FIG. Therefore, in the present invention, the column spacer 410 and the column spacer 410 are arranged along the extending direction of the data line 320 so that vertical movement of the column spacer 410 can be suppressed.

Also, as shown in FIG. 4, it is preferable that the column spacer stoppers disposed on the n-th gate wiring and the column spacer stoppers disposed on the (n + 1) -th gate wiring are disposed opposite to each other with respect to the column spacer . For example, the column spacer stopper may be formed on the upper side of the column spacer contact portion above the even-numbered gate wiring and on the lower side of the column spacer contact portion above the odd-numbered gate wiring. On the contrary, it may be formed on the lower side of the column spacer contact portion above the even gate wiring, and on the upper side of the column spacer contact portion above the odd gate wiring. When the column spacer stopper is arranged as described above, even when the stopper is formed only on one side of the column spacer, movement of the column spacer can be effectively suppressed when substrate bending or the like occurs.

The height of the column spacer stopper 420 may be 400 nm or more, preferably 400 nm to 1000 nm. When the height of the column spacer stopper 420 is less than 400 nm, the column spacer can 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 wiring 440 for touch sensing. At this time, 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 the metal layer. The touch wiring 440 may be formed of metal wiring. In this case, the touch wiring 440 may be disposed on the data wiring 320. When the touch wiring 440 is disposed above the data wiring 320, it is not necessary to form a black matrix additionally to cover the touch wiring 440.

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

An inorganic insulating film 440 made of silicon oxide, silicon nitride, or the like may be formed on the touch wiring 440 and the column spacer stopper 420 for insulation from the pixel electrode.

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

A column spacer 410 is provided under the color filter layer 372. The column spacer 410 is formed in a region covered with the black matrix 371 so as to maintain a gap between the first substrate and the second substrate. The column spacer 410 is formed to have a length that can contact the first substrate after the first substrate and the second substrate are bonded together to maintain a gap between the substrates.

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

However, the drawings illustrate the liquid crystal display panel according to the present invention in a simplified manner, but the present invention is not limited thereto. For example, although the thin film transistor is represented by a single thin film transistor in the drawing, the thin film transistor may be composed of one or more thin film transistor combinations depending on the characteristics of operation.

In addition, a method of controlling the arrangement of liquid crystal molecules can be variously applied to an IPS (In Plane Switching) mode or an FFS (Fringe Field Switching) mode in addition to a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode. Although the pixel electrode 357 is formed on the first substrate 110 and the common electrode 373 is formed on the second substrate 130 in the drawing, the pixel electrode 357 and the common electrode 373 ) Can also be changed and modified. The pixel electrode 357 and the common electrode 373 may be formed on the first substrate 110 in an IPS (In Plane Switching) mode or an FFS (Fringe Field Switching) mode.

The liquid crystal display panel 300 may include a thin film transistor, a color filter layer and a black matrix formed on a first substrate 110 and a second substrate 130 disposed on the first substrate 110 with a liquid crystal layer 120 therebetween. 110 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 is formed on the first substrate 110 in contact with the thin film transistor. At this time, in order to improve the aperture ratio and simplify the mask process, the black matrix may be omitted, and the common electrode may be formed to serve also 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 can be made without departing from the technical idea of the present invention.

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

The first substrate includes a plurality of gate wirings and data wirings arranged vertically to define pixel regions, and thin film transistors and column spacer stoppers provided in the respective pixel regions.

In order to form the first substrate, a gate wiring, a data wiring, and a thin film transistor are formed on a first substrate. At this time, the gate wiring, the data wiring, and the method of forming the thin film transistor may be performed using a thin film transistor forming method well known in the art. For example, a conductive metal is deposited on the first substrate and patterned using a mask process or the like to form a gate wiring and a gate electrode protruding from the gate wiring.

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 a touch wiring and a column spacer stopper. At this time, the column spacer stopper is formed in the upper region of the gate wiring, and is formed on one side of the contact portion of the column spacer and the second substrate.

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

The second substrate includes a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the openings, and at least one or more column spacers provided under the color filter layers.

In order to form the second substrate, a black matrix having a plurality of openings at positions corresponding to the respective pixel regions is formed on the second substrate. The black matrix may be formed using a black matrix forming method well known in the art. For example, the black matrix may be formed by applying a photosensitive black organic material on a second substrate, And then developing it.

When a black matrix is formed in the same manner as described above, a color filter layer in which red, green, and blue color filters are alternately arranged in the openings of the black matrix is formed. The color filter layer may be formed using a color filter layer forming method well known in the art. For example, a photopolymerizable photosensitive composition containing a pigment may be applied, selectively exposed using an exposure mask And then developing it.

When the color filter layer is formed, a column spacer is formed under the color filter layer. At this time, the color spacer can be formed by, for example, applying a photosensitive organic material onto the color filter layer, and then selectively exposing and developing using an exposure mask.

On the other hand, when the common electrode is provided on the second substrate, a common electrode forming process is performed before manufacturing the column spacer. At this time, 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-described method, an alignment material is coated on the first substrate and the second substrate, and then aligned to form an alignment layer.

Then, the first substrate and the second substrate are attached to each other using a seal pattern or the like, and then a liquid crystal material is injected to form a liquid crystal layer, thereby manufacturing a liquid crystal display panel.

According to the above-described method, since the column spacer stopper is formed at the time of forming the touch wiring, there is an advantage that it is not necessary 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 the 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 those described above, only the backlight unit will be described here.

The backlight unit 200 is for providing light to the display panel 100 and includes a light source unit 240 including a plurality of light sources 240b and the light conversion film 270 of the present invention . The backlight unit 200 may further include a bottom case 210, a reflection plate 220, a light guide plate 230, a guide panel 250, and an optical sheet 260 as required. Since details of the light conversion film 270 have been described above, other components of the backlight unit will be described.

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

The light source unit 240 includes a plurality of light sources 240b and a printed circuit board 240a on which the plurality of light sources 240b are mounted. At this time, 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 bonding 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 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 may be attached to the lower surface of the bending extension 211 of the bottom case 210. [

Although the light source unit 240 is disposed on one side of the bottom case 210 in the drawing, the light source unit 240 may be disposed on both sides of the bottom case 210 facing each other . Although the edge-type backlight unit 200 is shown 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 a top opened shape. The bottom case 210 has side walls extending in the form of a closed curve for receiving the light source unit 240, the light guide plate 230, the reflection plate 220, and the optical sheet 260. At this time, at least one side wall of the bottom case 210 may include a bending extension 211 extending from the upper edge to cover the light source unit 240. That is, one end surface of the bottom case 210 may have a shape of 'C'. At this time, a reflection member 243 may be disposed on the lower surface of the bending extension 211.

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

Meanwhile, the bending extension 211 may be omitted in the bottom case 210. That is, one end surface of the bottom case 210 may have a shape of 'B'. The bottom case 210 is fastened to the guide panel 250.

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

The guide panel 250 is disposed to surround the edge of the backlight unit 200 so as to be adhered 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. The guide panel 250 may have an opening in a region corresponding to the bending extension 211 of the bottom case 210.

Although not shown in the drawing, the bottom case 210 and the guide panel 250 may be assembled with hooks or assembled together with projections and recesses, respectively. Further, the bottom case 210 and the guide panel 250 may be bonded together through an adhesive member.

However, the present invention is not limited thereto, and the guide panel 250 may be disposed on the light source unit 240. At this time, a reflective member 243 may be disposed on the 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 formed to have a certain thickness in the drawing, the shape of the light guide plate 230 is not limited thereto. For example, the thickness of the light guide plate 230 may be thinner than both sides of the light guide plate 230 in order to reduce the overall thickness of the backlight unit 200, You may.

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

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 side 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 reflection plate 220 is disposed on the path of 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 reflection plate 220 is disposed below the light guide plate 230. The reflection plate 220 may reflect light traveling toward the upper surface of the bottom case 210 to the light guide plate 230 to increase light efficiency.

The reflection plate 220 may be disposed on the light source unit 240 when the light source unit 240 is disposed to correspond to a lower surface of the light guide plate 230. [ In detail, the reflection plate 220 is disposed on the printed circuit board 240a of the light source unit 240. [ In addition, the optical member 220 may include a plurality of holes for coupling the plurality of light sources 240b.

That is, the plurality of light sources 240b are inserted into a plurality of holes of the reflection plate 220, and the light source 240b may be exposed to the outside through the holes. Accordingly, the reflection plate 220 may be disposed on the printed circuit board 240a on the side of the light source 240b.

An optical sheet 260 for diffusing and condensing light 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 transmitted light. 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 light passing therethrough. Therefore, the light emitted onto the light guide plate 230 can be processed into a surface light source of higher brightness by transmitting the light through the optical sheet 260.

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 including a plurality of gate wirings and data wirings arranged perpendicularly to each other to define pixel regions, a thin film transistor provided in each pixel region, and a column spacer stopper formed on the gate wirings;
A second substrate including a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layers; And
And a liquid crystal layer interposed between the first substrate and the second substrate,
The column spacer stopper and the column spacer are arranged along the extending direction of the data line,
And the column spacer stopper is provided at one side of the contact portion of the column spacer and the second substrate.
The method according to claim 1,
a column spacer stopper disposed above the n-th gate wiring and a column spacer stopper disposed above the n + 1-th gate wiring are arranged opposite to each other with respect to the column spacer.
The method according to claim 1,
And the height of the column spacer stopper is 400 nm to 1000 nm.
The method according to claim 1,
Wherein the first substrate includes a touch electrode layer for touch sensing.
5. The method of claim 4,
And the touch electrode layer includes a touch wiring disposed on the data wiring.
6. The method of claim 5,
And the column spacer stopper is formed on the same layer as the touch wiring.
The method according to claim 1,
Wherein a distance from an end of the column spacer to an end of the black matrix is 10 m or less.
Forming a first substrate having a plurality of gate wirings and data wirings arranged perpendicular to each other to define a pixel region, a thin film transistor provided in each pixel region, and a column spacer stopper;
Forming a second substrate including a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the opening, and at least one column spacer provided under the color filter layer;
Attaching the first substrate and the second substrate 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 along the extending direction of the data line,
Wherein the column spacer stopper is formed on one side of the contact portion of the column spacer and the second substrate.
9. The method of claim 8,
The forming of the first substrate may include:
Forming a gate wiring, a data wiring, and a thin film transistor on the first substrate,
Forming an insulating layer on the gate wiring, the data wiring, and the thin film transistor;
Forming a metal layer on the insulating layer;
Patterning the metal layer to form a touch wiring and a column spacer stopper;
Forming an inorganic insulating film on the touch wiring and the column spacer stopper;
Forming a contact hole exposing a drain electrode of the thin film transistor; And
And forming a pixel electrode on the substrate.
9. The method of claim 8,
Wherein forming the second substrate comprises:
Forming a black matrix having a plurality of openings at positions corresponding to the respective pixel regions on a second substrate;
Forming a color filter layer on the opening; And
And forming a column spacer under the color filter layer.
1. A display device comprising a liquid crystal display panel and a backlight unit disposed under the liquid crystal display panel,
Wherein the liquid crystal display panel comprises a plurality of gate wirings and data wirings arranged perpendicularly to each other to define a pixel region, a thin film transistor provided in each pixel region, and a column spacer stopper formed on the gate wiring 1 substrate; A second substrate including a black matrix having a plurality of openings at positions corresponding to the pixel regions, a color filter layer provided in the openings, and at least one column spacer provided under the color filter layers; 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 extending direction of the data line, and the column spacer stopper includes the column spacer and the second substrate Is provided on one side of the contact portion of the liquid crystal display device.

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