KR20040107937A - Liquid crystal display device and liquid crystal display having the same - Google Patents

Abstract

PURPOSE: A liquid crystal display and a method for fabricating the same are provided to reduce size of a liquid crystal panel by adjacently forming a seal line and an alignment film while preventing inferiority of the seal line. CONSTITUTION: A lower substrate(500) faces an upper substrate(400). A first partition(470) is formed to an edge area of the lower substrate and a second partition(480) is separated from the first partition at a predetermined gap for surrounding the first partition. A seal line(460) is formed between the first partition and the second partition for combining the upper substrate and the lower substrate. Liquid crystal is interposed between the upper substrate and the lower substrate. A backlight assembly is formed under the lower substrate for providing light to the upper substrate and the lower substrate.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

The present invention relates to a liquid crystal display device and a method for manufacturing the same, and more particularly, to a liquid crystal display device and a method for manufacturing the same for reducing the size of the liquid crystal display panel at the same time to reduce the seal line defects.

In general, a liquid crystal display device includes a liquid crystal display panel having a TFT substrate, a color filter substrate facing the TFT substrate, and a liquid crystal interposed between both substrates to determine whether light is transmitted as an electric signal is applied.

Here, a pixel (Pixel) consisting of a gate line transferring a scan signal, a data line transferring an image signal, a TFT connected to the gate line and the data line, and a pixel electrode connected to the TFT is formed in the TFT substrate. Therefore, the TFT is driven by the scan signal applied through the gate line to apply the image signal to the pixel electrode. In addition, the color filter substrate is formed with a color filter that is expressed in a predetermined color by a common electrode facing the pixel electrode and light.

As shown in FIG. 1, a seal line 110 is formed in an edge region of the color filter substrate 100. At this time, the seal line 110 is formed by applying a sealant to surround the black matrix 120 formed to surround the color filter (not shown) formed in the central region of the color filter substrate 100.

As shown in FIG. 2A, the color filter substrate 100 is positioned on the TFT substrate 200 to assemble the color filter substrate 100 having the seal line 110 and the TFT substrate 200 as described above. Let's do it. Subsequently, pressure is applied to the two substrates at the top of the color filter substrate 100 and the bottom of the TFT substrate 200 in order to bring the two substrates 100 and 200 into close contact, and the two substrates are heated or irradiated with ultraviolet rays. The seal line 110 formed on the color filter substrate 100 is cured.

In this case, as shown in FIG. 2B, the seal line 110 is laterally spread by the pressure applied to the two substrates 100 and 200, and the seal line 110 spread laterally is the TFT substrate 200 and the color filter substrate ( A portion of the alignment layers 130 and 210 formed in the layer 100 overlap.

Accordingly, the seal line 110 overlapping the alignment layers 130 and 210 acts as a pollution source of the liquid crystal interposed between the color filter substrate 100 and the TFT substrate 200, resulting in a border unevenness in which the seal line region appears white.

Conventionally, the seal line was formed at a sufficient distance from the alignment film in order to prevent the above-mentioned edge stains from occurring. That is, the seal line was formed at a sufficient distance from the alignment film so as not to overlap the alignment film even when the seal line spreads laterally by the pressure applied to the TFT substrate and the color filter substrate.

Therefore, the liquid crystal display according to the related art has a problem in that the size of the liquid crystal display panel is increased in order to secure a sufficient separation distance between the alignment layer and the seal line.

Accordingly, an object of the present invention is to provide a liquid crystal display device for reducing the size of a liquid crystal display panel while preventing the occurrence of seal line defects.

In addition, another object of the present invention is to provide a manufacturing method for manufacturing the above-described liquid crystal display device.

1 is a plan view showing the configuration of a color filter substrate according to the prior art.

FIG. 2A is a view illustrating a state before pressing for coupling the color filter substrate and the TFT substrate of FIG. 1.

FIG. 2B is a view illustrating a state after pressing for coupling the color filter substrate and the TFT substrate of FIG. 1.

3 is a cross-sectional view illustrating a configuration of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 4 is a view schematically showing the configuration of the color filter substrate shown in FIG. 3.

5 is a perspective view illustrating a configuration of the color filter substrate illustrated in FIG. 3.

* Description of the symbols for the main parts of the drawings *

300: liquid crystal display device 400: upper substrate

410: first glass substrate 420: color filter

430: black matrix 440: common electrode

450: first alignment layer 460: seal line

470: first partition 480: second partition

500: lower substrate

In order to achieve the above object, the second substrate of the liquid crystal display according to the present invention faces the first substrate and is spaced apart from the first partition wall, the first partition wall being formed to surround the edge region, and spaced apart from the first partition wall by a predetermined distance. And a second partition wall formed to surround the coupling member, wherein the coupling member is formed between the first and second partition walls to join the first and second substrates, and the liquid crystal is interposed between the first substrate and the second substrate, and the light generating device Is configured under the first substrate to provide light to the first substrate and the second substrate. Here, the first and second partitions form a cell gap of a predetermined height between the first and second substrates, and the liquid crystal is interposed in the cell gap.

In addition, the liquid crystal display according to the present invention forms a first substrate and a second substrate facing the first substrate, and forms a first partition wall so as to surround an edge region on the first substrate, and a predetermined distance from the first partition wall. A second barrier rib is formed to be spaced apart to surround the first barrier rib, a seal line is formed between the first barrier rib and the second barrier rib, and the seal line is hardened to bond the first substrate to the second substrate. .

According to the liquid crystal display, since the seal line does not spread laterally by the first and second barrier walls when the upper substrate and the lower substrate are compressed, the edge irregularity caused by the overlap of the seal line and the alignment layer is prevented, The line and the alignment layer can be formed adjacent to each other, so that the size of the liquid crystal display device can be reduced.

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

3 is a cross-sectional view illustrating a configuration of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4 is a plan view schematically illustrating the configuration of the color filter substrate illustrated in FIG. 3, and FIG. 5 is a color illustrated in FIG. 3. It is a perspective view which shows the structure of a filter board | substrate.

Referring to FIG. 3, the liquid crystal display device 300 according to an exemplary embodiment of the present invention includes a liquid crystal formed between the upper substrate 400, the lower substrate 500, the upper substrate 400, and the lower substrate 500. And a liquid crystal display panel composed of a layer 600 to display an image. The liquid crystal display device 300 further includes a backlight assembly (not shown) formed under the lower substrate 500 to provide light to the upper substrate 400 and the lower substrate 500.

The upper substrate 400 is formed of R (Red), G (Green), and B (Blue) color pixels on the first glass substrate 410, and a color filter 420, which is expressed in a predetermined color by light, Black matrix (BM) formed around the periphery of the color pixels or surrounding the color filter 420 to block the light leaked from the color pixels to improve the Contrast Rate (C / R). 430.

Thereafter, on the first glass substrate 410 having the color filter 420 and the black matrix 430 formed of indium tin oxide (ITO) or indium zinc oxide (IZO). The common electrode 440 is formed. In addition, a first alignment layer 450 is formed on the common electrode 440.

In the lower substrate 500, a thin film transistor (hereinafter, referred to as TFT) 520 is formed on the second glass substrate 510 in a matrix form by a thin film process. In addition, a plurality of data lines (not shown) extending in a row direction and a plurality of gate lines (not shown) extending in a column direction are formed on the second glass substrate 510. At this time, the source electrode of the TFT 520 is connected to the data line, and the gate electrode of the TFT 520 is connected to the gate line. In addition, the drain electrode of the TFT 520 is connected to the pixel electrode 530 made of ITO or IZO. In this case, a second alignment layer 540 is formed on the second glass substrate 510 including the pixel electrode 530.

The upper substrate 400 and the lower substrate 500 having the above configuration are firmly coupled by the seal line 460 formed on the upper substrate 400. Here, the seal line 460 is formed between the first and second partitions 470 and 480 formed on the upper substrate 400.

That is, as shown in FIGS. 4 and 5, in the central region of the upper substrate 400, an R color pixel expressing red color, a G color pixel expressing green color, and a B color pixel expressing blue color are formed in the central region of the upper substrate 400. A color filter 420 arranged in a shape is formed, and a black matrix 430 is formed to surround the color pixels of the color filter 420 and surround the color pixels from the outside.

In addition, a first partition 470 is formed in the outer region of the upper substrate 400 to contact the black matrix 430, and surround the black matrix 430 at the outer side, and surround the first partition 470 at the outer side. The second partition 480 is formed to be spaced apart by a predetermined interval. In this case, the first and second barrier ribs 470 and 480 are formed to have a predetermined height to maintain a cell gap having a predetermined height between the upper substrate 400 and the lower substrate 500. Subsequently, a seal line 460 is formed between the first partition wall 470 and the second partition wall 480.

In order to couple the lower substrate 500 to the upper substrate 400 configured as described above, first, the upper substrate 400 is positioned on the lower substrate 500. Subsequently, pressure is applied from the upper portion of the upper substrate 400 and the lower portion of the lower substrate 500 to closely contact the upper substrate 400 and the lower substrate 500, and heat or two ultraviolet rays are applied to the two substrates 400 and 500. Investigate. At this time, the seal line 460 formed on the upper substrate 400 is cured by heat or ultraviolet rays applied to the two substrates 400 and 500 so that the upper substrate 400 and the lower substrate 500 are firmly coupled to each other.

Here, the seal line 460 formed on the upper substrate 400 does not spread laterally by the first and second partitions 470 and 480 even when pressure is applied from the upper and lower portions to closely contact the two substrates 400 and 500. Therefore, since the portion where the seal line 460 and the first alignment layer 450 overlap each other does not occur, stains in which the edge of the liquid crystal display is white are not generated.

In addition, since the seal line 460 does not spread laterally by the first and second partitions 470 and 480, the seal line 460 is formed to be adjacent to the first alignment layer 450. Therefore, since the separation distance between the existing seal line and the alignment layer is unnecessary, the size of the liquid crystal display device is reduced by the separation distance.

In the above, when the liquid crystal display according to the exemplary embodiment of the present invention forms a liquid crystal layer using a vacuum pressure, the seal line 460 is formed between the first and second partitions 470 and 480. After the upper substrate 400 and the lower substrate 500 are combined, a liquid crystal is injected between the two substrates to form the liquid crystal layer 600.

On the other hand, when the liquid crystal display according to the exemplary embodiment of the present invention forms a liquid crystal layer using a dropping method, the liquid crystal is deposited in the seal line 460 formed between the first and second partition walls 470 and 480. After dropping to form the liquid crystal layer 600, the upper substrate 400 and the lower substrate 500 are coupled by the seal line 460.

As described above, the liquid crystal display according to the present invention forms first and second partition walls having a predetermined separation distance around an outer edge of the color filter substrate, and forms a seal line between the formed first and second partition walls. .

Therefore, even if pressure is applied to the two substrates to bond the color filter substrate and the TFT substrate on which the seal lines are formed, the seal lines are prevented from spreading laterally by the first and second partition walls.

Accordingly, the present invention can prevent the seal line from spreading to the side, thereby preventing a portion of the alignment layer from overlapping, and thus, unevenness occurs on the edge of the liquid crystal display panel, thereby improving display quality.

In addition, since the separation distance between the seal line and the alignment layer is unnecessary, the present invention can form the seal line and the alignment layer adjacent to each other, thereby reducing the size of the liquid crystal display device.

While the invention has been described with reference to the examples, those skilled in the art may variously modify and change the invention without departing from the spirit and scope of the invention as set forth in the claims below. You will understand.

Claims (7)

A first substrate; A second substrate having a first partition wall facing the first substrate and formed to surround an edge region, and a second partition wall spaced apart from the first partition wall by a predetermined distance to surround the first partition wall; A coupling member formed between the first and second partition walls to join the first and second substrates; A liquid crystal interposed between the first substrate and the second substrate; And And a light generating device formed under the first substrate to provide light to the first and second substrates. The liquid crystal display device of claim 1, wherein the first and second barrier ribs form a cell gap having a predetermined height between the first and second substrates, and the liquid crystal is interposed in the cell gap. The method of claim 1, wherein the first substrate A plurality of gate lines; A plurality of data lines crossing the gate lines; A pixel electrode formed in an area defined by two adjacent gate lines and data lines among the plurality of gate lines and data lines; And And a switching element connected to the pixel electrode. The method of claim 1, wherein the first substrate A color filter formed in an inner region surrounded by the first and second partition walls to express a predetermined color by the light; And And a common electrode formed on the color filter. Forming a first substrate and a second substrate opposite the first substrate; Forming a first partition wall to surround an edge region on the first substrate; Forming a second partition wall spaced apart from the first partition wall by a predetermined distance to surround the first partition wall; Forming a seal line between the first partition wall and the second partition wall; And Hardening the seal line to bond the first substrate and the second substrate. 6. The method of claim 5, further comprising interposing a liquid crystal between the first substrate and the second substrate before combining the first and second substrates. 7. The method of claim 5, further comprising: interposing a liquid crystal between the first substrate and the second substrate after joining the first and second substrates.