KR20060134504A - Display panel and display device having the same - Google Patents

Abstract

A display panel and a display device having the same are provided to enhance the electric connection between a lower substrate and an upper substrate, by contacting a first short point of the lower substrate with a second short point of the upper substrate during binding of the lower and upper substrates. A first substrate(200) is composed of a display area(DA) and a non-display area(NDA) surrounding the display area. A second substrate(300) is disposed to face the first substrate. A first short point(600) is formed in the non-display area of the first substrate, and electrically connects between the first substrate and the second substrate. A second short point(700) is formed on the second substrate correspondingly to the first short point, and electrically connects between the first substrate and the second substrate.

Description

Display panel and display device having same {DISPLAY PANEL AND DISPLAY DEVICE HAVING THE SAME}

1 is a cross-sectional view showing a liquid crystal display device according to the present invention.

FIG. 2 is a plan view schematically illustrating the lower substrate shown in FIG. 1.

3 is a plan view schematically showing the upper substrate shown in FIG.

4 is a cross-sectional view taken along line II ′ of FIG. 1.

* Explanation of symbols for main parts of drawings *

100: liquid crystal display panel 200: lower substrate

220: TFT 230: organic film

250: common voltage electrode pad 260: first partition wall

300: upper substrate 370: second partition wall

600: first short point 700: second short point

The present invention relates to a display panel and a display device having the same, and more particularly, to a display panel and a display device having the same for improving productivity and display quality.

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.

A seal line in which sealant is printed is formed on an outer periphery of the color filter substrate so as to surround the color filter. The TFT substrate and the color filter substrate are physically and firmly coupled by the seal line.

After the sealant printing process is completed, a short process for electrically connecting the color filter substrate and the TFT substrate is performed. That is, the short process is a process for electrically connecting the color filter substrate and the TFT substrate, and is a process for providing a common electrode input through the TFT substrate as a common electrode of the color filter substrate.

The short process partially overlaps the seal line of the color filter substrate or forms a predetermined number of short points due to the conductive material on the outer side of the seal line. The short point electrically connects the pixel electrode of the TFT substrate and the common electrode of the color filter substrate, and applies a common voltage input to the TFT substrate to the common electrode of the color filter substrate.

After the shorting process, the color filter substrate and the TFT substrate are joined at a predetermined pressure up and down and irradiated with ultraviolet rays. As a result, the seal line is cured so that the TFT substrate and the color filter substrate are firmly bonded to each other.

In the process described above, a defect occurs in which the short point formed on the color filter substrate is not properly bonded to the TFT substrate due to the deviation of the traveling conditions.

As such, when the short point is not properly bonded to the TFT substrate, the voltage level of the common voltage provided from the TFT to the color filter substrate is lowered. Therefore, as the voltage level of the common voltage decreases, defects such as crosstalk occur.

In addition, since a laser repair process for repairing the bonding defect of the short point is required, there is also a problem in that productivity is lowered.

Accordingly, an aspect of the present invention is to provide a display panel having a structure for strengthening electrical coupling between an upper substrate and a lower substrate of the present invention.

Another object of the present invention is to provide a display device having the display panel.

The display panel according to the present invention for achieving the above object includes a first substrate, a second substrate, a first short point and a second short point.

The first short point is formed on the first substrate corresponding to the peripheral area to electrically connect the first substrate and the second substrate. The second short point is formed on the second substrate to correspond to the first short point to electrically connect the first substrate and the second substrate.

According to another aspect of the present invention, there is provided a display device including a light generating device for generating light, a display area for displaying an image by the light, and a peripheral area surrounding the display area. A second short substrate formed on the first substrate so as to correspond to an opposing second substrate, the peripheral region, and a second short point corresponding to the first short point and an electrical connection between the first substrate and the second substrate; And a second short point formed on the substrate to electrically connect the first substrate and the second substrate.

According to such a display panel and a display device having the same, the bonding force between the first and second short points is enhanced, so that the voltage level of the common voltage provided to the second substrate through the first substrate is kept constant, thereby improving display quality. do.

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

1 is a cross-sectional view showing a liquid crystal display device according to the present invention. FIG. 2 is a plan view schematically illustrating the lower substrate shown in FIG. 1, and FIG. 3 is a plan view schematically illustrating the upper substrate illustrated in FIG. 1.

As shown in FIGS. 1 to 3, a liquid crystal display according to the present invention includes a liquid crystal display panel 100 displaying an image and a light generating device providing light to the liquid crystal display panel 100 to display the image. And 150.

The liquid crystal display panel 100 includes a lower substrate 200, an upper substrate 300 facing the lower substrate 200, a liquid crystal layer 400 and a lower substrate formed between the lower substrate 200 and the upper substrate 300. It consists of a seal line 500 for coupling the 200 and the upper substrate 300.

The liquid crystal display panel 100 is divided into a display area DA in which an image is displayed and a non-display area NDA surrounding the display area DA. The non-display area DA includes a seal line area SA in which the seal line 500 is formed, and a peripheral area PA positioned outside the seal line area SA.

On the first substrate 210 of the lower substrate 200 corresponding to the display area DA, a plurality of gate lines GL extending in a first direction D1 and an orthogonal to the first direction D1 are formed. A plurality of data lines DL extending in two directions D2 are formed. In this case, a plurality of pixel areas are defined by two adjacent gate lines and data lines among the plurality of gate lines GL and the plurality of data lines DL.

A thin film transistor (TFT) 220 and a liquid crystal capacitor Clc are formed on the first substrate 210 corresponding to the pixel area. The TFT 220 includes a gate electrode 221 branched from the gate line GL, a source electrode 224 branched from the data line DL, and a drain electrode 225 spaced apart from the source electrode 224. . In addition, the TFT 220 includes a gate insulating film 222 and an active layer 223 formed on the gate electrode 221.

The gate insulating layer 222 is formed on the first substrate 210 on which the gate electrode 221, the source electrode 224, and the drain electrode 225 are formed. For example, the gate insulating layer 222 may be formed of a silicon nitride layer SiNx.

The active layer 223 is formed on the gate insulating layer 222. In this case, the active layer 223 includes a semiconductor layer 223a and an ohmic contact layer 223b stacked on the semiconductor layer 223a. For example, the semiconductor layer 223a is made of amorphous silicon (a-Si), and the ohmic contact layer 223b is made of amorphous silicon (n + a-Si) doped with a high concentration of n-type impurities. Is done. A portion of the ohmic contact layer 223b is removed to partially expose the semiconductor layer 223a.

The organic layer 230 is formed on the TFT 220 formed on the first substrate 210 to correspond to the display area DA. In this case, the organic layer 230 has a contact hole 235 for partially exposing the drain electrode 225 of the TFT 220.

The pixel electrode 240, which is a transparent electrode, is formed on the organic layer 235. The pixel electrode 240 is made of a transparent conductive material through which light can pass. For example, the pixel electrode 240 is made of indium zinc oxide (IZO) or indium tin oxide (ITO). In this case, the pixel electrode 240 is electrically connected to the drain electrode 225 of the TFT 220 through the contact hole 235.

Meanwhile, a seal line 500 is formed on the first substrate 210 corresponding to the seal line area SA to bond the lower substrate 200 and the upper substrate 300 to each other. The seal line 500 includes a photocurable material and is hardened by receiving light provided from the outside in a state interposed between the lower substrate 200 and the upper substrate 300. As a result, the lower substrate 200 and the upper substrate 300 are firmly coupled.

The common voltage electrode pad 250 for providing the common voltage Vcom to the liquid crystal display panel 100 is formed on the first substrate 210 corresponding to the peripheral area PA. In this case, the common voltage electrode pad 250 is formed in the corner region of the first substrate 210. In the present exemplary embodiment, the common voltage electrode pad 250 is formed at one corner, but a plurality of common voltage electrode pads 250 may be formed.

In this case, the common voltage electrode pad 250 is formed of the same material in the same process when forming the gate electrode 221 of the TFT 220. Meanwhile, the common voltage electrode pad 250 may be formed in the same process when the source electrode 224 and the drain electrode 225 of the TFT 220 are formed.

A first short point 600 is formed on the common voltage electrode pad 250. The first short point 600 is formed by a paste including conductive particles.

4 is a cross-sectional view taken along line II ′ of FIG. 1.

As shown in FIG. 4, the first short point 600 includes the paste 810 and the conductive particles 820 included in the paste 810. In the present embodiment, the conductive particles 820 are made of silver (Ag) particles. On the other hand, the conductive particles 820 may be made of gold (Au) or the like.

In addition, a first barrier rib 270 surrounding the first short point 600 is formed on the common voltage electrode pad 250. The first barrier rib 270 is formed of the same material when the organic layer 230 is formed on the display area DA. At this time, the first partition 270 has a rectangular strip shape having a curved surface at the corner. Meanwhile, the first partition 270 may have various shapes other than the rectangular band shape.

In the present exemplary embodiment, the first short point 600 is formed by spraying the paste 810 including the conductive particles 820 in the first partition 270. Here, the first partition wall 270 surrounds the first short point 600 at the outside, thereby increasing the strength of the first short point 600. In addition, the first barrier rib 270 prevents the paste 810 from spreading sideways when the paste 810 for forming the first short point 600 is sprayed onto the first substrate 210.

The via hole 255 partially exposes the common voltage electrode pad 250 on the first substrate 210 corresponding to the peripheral area PA. The via hole 255 is formed by partially removing the gate insulating layer 222 on the common voltage electrode pad 250.

The via hole 255 is formed by depositing a first barrier rib 270 on the common voltage electrode pad 250 and partially removing the first barrier rib 270 and the gate insulating layer 222. In addition, the first partition 270 has a space in which the first short point 600 may be formed.

Meanwhile, the upper substrate 300 may include the light blocking film 320, the color filter 330, the planarization film 340, the common electrode 350, and the cell gap holding member 360 (hereinafter, referred to as “column”) on the second substrate 310. A spacer formed on the substrate).

The light blocking film 220 is formed in a matrix shape corresponding to the display area DA to block light leakage between the pixel areas in the display area DA. In addition, the light blocking film 320 is formed on the second substrate 310 to correspond to the seal line area SA and the peripheral area PA so as to surround the display area DA at the outside.

The color filter 330 is formed in the display area DA on the second substrate 310 on which the light blocking film 320 is formed. The color filter 330 includes R color pixels, G color pixels, and B color pixels. In this case, the R, G, and B color pixels of the color filter 330 are formed so that both ends partially overlap the light blocking film 320.

The planarization layer 340 has a predetermined thickness on the color filter 330 and the light shielding layer 320 to remove a step formed between the R, G, and B color pixels of the color filter 330 and the light shielding layer 320. Is formed. In this case, the planarization layer 340 is formed on the entire surface of the second substrate 310.

The common electrode 350 is formed to have a uniform thickness on the entire surface of the second substrate 310 on which the planarization layer 340 is formed. The column spacer 360 is formed on the common electrode 350. The column spacer 360 is formed on the second substrate 310 to correspond to the TFT 220. Therefore, the opening ratio of the liquid crystal display panel 100 is not affected. The column spacer 360 is formed of an organic material.

In addition, the upper substrate 300 includes a second short point 700 and a second partition 370. The second short point 700 is formed in the peripheral area PA on the second substrate 310 to correspond to the first short point 600. In this case, the second short point 700 is formed of the same material as the first short point 600. That is, the second short point 700 is formed by the paste 810 including the conductive particles 820.

The second partition wall 370 is formed of the same material when the column spacer 360 is formed. At this time, the second partition 370 has a rectangular strip shape having a curved surface at the corner. Meanwhile, the second partition wall 370 may have various shapes other than the rectangular band shape.

In the present exemplary embodiment, the second short point 700 is formed by spraying the paste 810 including the conductive particles 820 in the second partition 370. Here, the second partition wall 370 wraps the second short point 700 at the outside, thereby increasing the strength of the second short point 700. In addition, the second partition wall 370 prevents the paste 810 from spreading sideways when the paste 810 for forming the second short point 700 is sprayed on the second substrate 310.

Here, when the upper substrate 300 and the lower substrate 200 are assembled, the upper end portions of the first short point 600 and the second short point 700 are in contact with each other. At this time, since the first short point 600 and the second short point 700 are made of the same material, the bonding force increases as the conductive particles 820 directly contact each other. Therefore, the electrical coupling force between the upper substrate 300 and the lower substrate 200 is improved by the first short point 600 and the second short point 700.

Accordingly, the common voltage Vcom provided from the outside through the common voltage electrode pad 250 of the lower substrate 200 passes through the first short point 600 and the second short point 700 of the upper substrate 300. It is provided to the common electrode 350. In this case, the voltage level of the common voltage Vcom provided to the common electrode 350 is kept constant.

In the present invention, the first and second barrier ribs 270 and 370 not only increase the strength of the first and second short points 600 and 700, but also maintain a cell gap between the upper substrate 300 and the lower substrate 400.

As described above, the display panel according to the present invention includes a first short point formed on the lower substrate and a second short point formed on the upper substrate. The first and second short points are in contact with each other at the upper end when the lower substrate and the upper substrate are assembled. In this case, the first and second short points are made of a paste containing conductive particles.

Therefore, in the present invention, the first and second short points are in contact with each other, and as a result, the bonding force of the first and second short points is enhanced as the conductive particles are directly bonded.

Accordingly, in the present invention, as the bonding force between the first and second short points is strengthened, the electrical coupling force between the upper substrate and the lower substrate is increased, so that the voltage level of the common voltage provided to the upper substrate is kept constant. As a result, the display quality is improved because crosstalk is prevented due to the variation of the voltage level of the common voltage.

In addition, the present invention improves productivity because the laser repair process for repairing the upper substrate and the lower substrate by the first and second short points is increased, so that the repair is unnecessary.

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

Claims (9)

A first substrate comprising a display area and a peripheral area surrounding the display area; A second substrate made of a second substrate facing the first substrate; A first short point formed on the first substrate corresponding to the peripheral area to electrically connect the first substrate and the second substrate; And And a second short point formed on the second substrate so as to correspond to the first short point and electrically connecting the first substrate and the second substrate. The display panel of claim 1, wherein an upper end portion of the first short point and the second short point are in contact with each other. The method of claim 1, And a common voltage electrode pad formed under the first short point in the peripheral area to receive a common voltage from the outside. The method of claim 3, A first partition wall formed to surround the first short point at an upper portion of the common voltage electrode pad; And And a second partition wall formed to surround the second short point in an area corresponding to the first partition wall. The method of claim 4, wherein the first substrate A switching element formed in the display area; An organic layer formed on the switching element and having a contact hole partially exposing the switching element; A pixel electrode formed on the organic layer and electrically connected to the switching element through the contact hole; The first partition wall is made of the same material as the organic layer. The method of claim 4, wherein the second substrate is A color filter formed to correspond to the display area; A common electrode formed on the color filter and receiving a common voltage input from the common electrode pad through the first short point and the second short point; And A column spacer protruding from the common electrode toward the first substrate to maintain a cell gap with the first substrate, The second partition wall is made of the same material as the column spacer. The method of claim 1, wherein the first and second short points are glue; And And conductive particles formed inside the adhesive to electrically connect the first substrate and the second substrate. The display panel of claim 7, wherein the conductive particles are made of at least one of silver and gold. A light generating device for generating light; A first substrate comprising a display area for displaying an image by the light and a peripheral area surrounding the display area; A second substrate facing the first substrate; A first short point formed on the first substrate corresponding to the peripheral area to electrically connect the first substrate and the second substrate; And And a second short point formed on the second substrate so as to correspond to the first short point, and electrically connecting the first substrate and the second substrate.

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