KR20060119133A - Display board - Google Patents

Abstract

Disclosed is a display substrate that facilitates a laser repair process. The plurality of gate lines are formed to intersect the plurality of data lines, and the pixel electrode is formed in a pixel region defined by two data lines and a gate line adjacent to each other. The plurality of common electrode lines form a storage capacitor facing the pixel electrode in the pixel area, have a first formation width at the center of the region parallel to the data line, and a second formation width smaller than the first formation width at both ends. Has Accordingly, the laser cutting process can be easily performed because the distance between the data line is widened at both ends of the common electrode line.

Description

Display board {DISPLAY SUBSTRATE}

1 is a plan view showing a display substrate according to the present invention.

FIG. 2 is an enlarged view of portion 'A' of FIG. 1.

FIG. 3 is a plan view illustrating a laser repair process in the case of residual defect of the display substrate illustrated in FIG. 1.

4 is a plan view illustrating a display substrate according to another exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: display substrate 110: TFT

120: pixel electrode 130: first common electrode line

130a: first common electrode line part 130b: second common electrode line part

130c: third common electrode line part 130d: fourth common electrode line part

The present invention relates to a display substrate, and more particularly, to a display substrate which is easy for a laser repair process.

In general, the liquid crystal display panel includes a display substrate, a color filter substrate facing the display substrate, and a liquid crystal layer interposed between the display substrate and the color filter substrate.

The display substrate is composed of a plurality of pixels which are the minimum units representing an image. Each pixel includes a gate line provided with a gate signal, a data line provided with a data signal, a thin film transistor connected to the gate line and the data line, a pixel electrode receiving the data signal and applying a voltage to a liquid crystal layer, and the pixel. And a common electrode line facing the electrode to maintain the voltage provided to the liquid crystal layer for a predetermined time.

As described above, when a plurality of display substrates are formed on the mother substrate, an array inspection process of inspecting an electrical operation state of the wires on the display substrate is performed. At this time, when the patterning of Cr, Al, Mo for forming the gate line or the data line, or ITO or IZO for forming the pixel electrode, the metal film may not be properly removed. Since the remaining metal film forms a short or parasitic capacitance between adjacent wires, it must be detected by the optical / electrical inspection and removed through a laser cutting process.

However, a liquid crystal display device having a structure capable of simultaneously satisfying a decrease in vertical streaks and an increase in aperture ratio due to a change in coupling capacitance between the pixel electrode and the data line is gradually increasing. As a result, the gap between the common electrode line and the data line becomes close, and a short between the common electrode line and the data line occurs during the laser cutting process.

Accordingly, an object of the present invention is to provide a display substrate for facilitating a laser repair process.

The present invention for achieving the above object includes a plurality of data lines, a plurality of gate lines, a pixel electrode and a common electrode line.

The plurality of gate lines are formed to cross the data lines, and the pixel electrode is formed in a pixel region defined by two data lines and a gate line adjacent to each other.

The common electrode line forms a storage capacitor facing the pixel electrode in the pixel area, and has a first formation width and a second formation width in an area parallel to the data line. Here, the common electrode line is adjacent to the data line in the pixel area, has the first formation width at the center of a region parallel to the data line, and the first electrode at both ends adjacent to the gate lines. And a first common electrode line portion having a second formation width smaller than the formation width, and a second common electrode line portion adjacent to the gate lines and extending parallel to the gate lines.

According to the display substrate, the common electrode line adjacent to the data line has a first formation width at the center region and a second formation width at both ends thereof, which is smaller than the first formation width, so that data lines at both ends of the common electrode line are provided. Since the interval with the wider, the laser cutting process can be easily made.

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

1 is a plan view illustrating a display substrate according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged view of a portion 'A' of FIG. 1.

As shown in FIG. 1, the display substrate 100 according to the present invention includes a plurality of pixel areas PA, which are basic units for displaying an image. The plurality of pixel areas PA may extend in a plurality of gate lines GLn-1, GLn,..., Extending in a first direction D1, and in a second direction D2 perpendicular to the first direction D1. It is defined by an extended number of data lines DLm-1, DLm, ....

Each pixel area PA of the display substrate 100 includes a thin film transistor 110 (hereinafter, referred to as a TFT) 110 and a pixel electrode 120. The gate electrode 112 of the TFT 110 is branched from the corresponding gate line GLn, the source electrode 114 is branched from the corresponding data line DLm, and the drain electrode 116 is the pixel electrode 120. ) Is electrically connected. Accordingly, the TFT 110 receives the data signal applied to the data lines DLm-1, DLm, ... in response to the gate signals applied from the gate lines GLn-1, GLn, ... 120).

The pixel electrode 120 faces a common electrode (not shown) formed on an opposite substrate (not shown) coupled to the display substrate 100. A liquid crystal layer (not shown) made of a vertical alignment liquid crystal is interposed between the display substrate 100 and the counter substrate. Thus, a liquid crystal capacitor is formed by the pixel electrode 120, the common electrode, and the liquid crystal layer. The pixel electrode 120 and the common electrode are patterned in a predetermined form to divide the pixel area PA into a plurality of domains. The first opening 125 is formed in the pixel electrode 120 to be removed between the domains, and the second opening 200 is formed in the common electrode. Therefore, the liquid crystal molecules of the liquid crystal layer are vertically arranged in different directions for each of the domains.

In addition, each pixel area PA of the display substrate 100 further includes a first common electrode line 130 facing the pixel electrode 120 to form a storage capacitor. In this case, the first common electrode line 130 may include the first common electrode line part 130a, the second common electrode line part 130b, the third common electrode line part 130c, and the fourth common electrode line part 130d. Is made of.

The first common electrode line part 130a is formed adjacent to the previous gate line GLn-1 and extends in the first direction D1. The second common electrode line part 130b is formed adjacent to the data line DLm-1 of the previous stage and extends in the second direction D2 in the pixel area PA. The third common electrode line part 130c is formed adjacent to the corresponding data line DLm and extends in the corresponding second direction D2 in the pixel area PA. In addition, the fourth common electrode line part 130d has a smaller forming width than the first opening 125 and has a shape inclined in the second direction and about 45 degrees.

Here, the first common electrode line part 130a connects one end of the second common electrode line part 130b and one end of the third common electrode line part 130c to each other in the pixel area PA. In addition, the first to third common electrode line parts 130a, 130b, and 130c surround the pixel electrode 120 to partially overlap with the pixel electrode 120. The first to third common electrode line parts 130a, 130b, and 130c may be partially covered by the pixel electrode 120.

The first common electrode line 130 formed by the first to fourth common electrode line parts 130a, 130b, 130c, and 130d is applied with a voltage which is substantially the same as or similar to that of the common voltage applied to the common electrode.

Meanwhile, the second and third common electrode line parts 130b and 130c have different formation widths at the central area and at both ends. That is, the second and third common electrode line parts 130b and 130c have a formation width relatively smaller than the center area at both ends.

As shown in FIG. 2, the second common electrode line part 130b has a first formation width w1 in the center region. In addition, the second common electrode line part 130b has a second formation width w2 at both ends. That is, the second common electrode line part 130b is removed by a predetermined width toward the pixel electrode 120 from one end adjacent to the previous gate line GLn-1 and the other end adjacent to the gate line GLn. It has a shape. Therefore, the second common electrode line part 130b has a second formation width w2 smaller than the first formation width w1 at the one end and the other end.

Although the second common electrode line part 130b is described as an example, the third common electrode line part 130c also has the same configuration as the second common electrode line part 130b.

As such, since the second and third common electrode line portions 130b and 130c have relatively small formation widths at both ends, the distance between the data lines DLm-1 and DLm is relatively wider than that of the central region. All. Therefore, the laser cutting process of the second or third common electrode line parts 130b and 130c is easily performed without damaging the data lines DLm-1 and DLm. The second or third common electrode line portions 130b and 130c are insulated by the laser coating process, thereby causing the second or third common electrode line portions 130b and 130c to float.

In addition, since the both ends of the second and third common electrode line portions 130b and 130c do not have to be spaced apart from the data lines DLm-1 and DLm in order to facilitate laser cutting, the aperture ratio is improved.

Referring back to FIG. 1, the display substrate 100 further includes a bridge electrode 140 for electrically connecting common electrode lines formed in adjacent pixel regions in a second direction D2. The first common electrode line 130 is electrically connected to the second common electrode line 150 formed in the adjacent pixel region in the second direction D2 through the bridge electrode 140.

FIG. 3 is a plan view illustrating a laser repair process in the case of residual defect of the display substrate illustrated in FIG. 1.

As illustrated in FIG. 3, in the manufacturing process of the data lines DLm-1 and DLm, when the defect 600 in which metal materials such as chromium Cr remain, the first to sixth shown in the drawings are illustrated. Laser cut the arrows (①, ..., ⑥).

That is, one end ① and the other end ② of the second common electrode line part 130b of the first pixel area PA1 are laser cut, and the third common electrode line part of the adjacent second pixel area PA2 is laser cut. One end (③) and the other end (④) of 130c are laser cut. In addition, the center regions ⑤ and ⑥ of the fourth common electrode line part 130d of the first pixel region PA1 are laser cut. As a result, the second common electrode line part 130b, the third common electrode line part 130c, and the fourth common electrode line part 130d are insulated from each other, so that the first common electrode line 130 is in a floating state. do. Therefore, the pixel area where the residual defect has occurred can be easily repaired by the laser cutting process.

In the above description, the case where both ends of the third and fourth common electrode line portions 130c and 130d have a relatively small second formation width w2 is illustrated, but the second formation width w2 where the center region is relatively small is described. Can have

4 is a plan view illustrating a display substrate according to another exemplary embodiment of the present invention.

As shown in FIG. 4, the display substrate 400 according to the present exemplary embodiment includes a plurality of pixel areas defined by a plurality of gate lines GLn-1 and GLn and a plurality of data lines DLm-1 and DLm. (PA). A plurality of TFTs 410 and a pixel electrode 420 are formed in each pixel area PA.

In addition, each pixel area PA of the display substrate 400 further includes a first common electrode line 430 facing the pixel electrode 420 to form a storage capacitor. In this case, the first common electrode line 430 may include the first common electrode line part 430a, the second common electrode line part 430b, the third common electrode line part 430c, and the fourth common electrode line part 430d. Is made of.

The first common electrode line part 430a is formed adjacent to the previous gate line GLn-1 and extends in the first direction D1. The second common electrode line part 430b is formed adjacent to the corresponding gate line GLn and extends in the first direction D1 in the pixel area PA. The third common electrode line part 430C is formed adjacent to the previous data line DLm-1 and extends in the second direction D2 in the pixel area PA. The fourth common electrode line part 430d is formed adjacent to the corresponding data line DLm and extends in the corresponding second direction D2 in the pixel area PA.

Here, the first to third common electrode line parts 430a, 430b, and 430c surround the pixel electrode 420 so as to partially overlap the pixel electrode 420. The first to third common electrode line parts 430a, 430b, and 430c have a structure partially covered by the pixel electrode 420.

The first common electrode line 430 formed by the first to fourth common electrode line parts 430a, 430b, 430c, and 430d is applied with a voltage which is about the same as or substantially equal to the common voltage applied to the common electrode.

On the other hand, the third and fourth common electrode line portions 430c and 430d have different formation widths at the central region and at both ends. That is, the third and fourth common electrode line portions 430c and 430d have the first formation width w1 at the central region and the second formation width w2 smaller than the first formation width w1 at both ends. Have

The third common electrode line part 430c has a shape in which the third common electrode line part 430c is removed by a predetermined width toward the pixel electrode 420 at one end adjacent to the previous gate line GLn-1 and the other end adjacent to the gate line GLn. Has Accordingly, the third common electrode line part 430c has a second formation width w2 smaller than the first formation width w1 at the one end and the other end.

Although the third common electrode line part 430c has been described as an example, the fourth common electrode line part 430d also has the same configuration as the third common electrode line part 430c.

As described above, since the third and fourth common electrode line portions 430c and 430d have relatively small formation widths at both ends, the distance between the third and fourth common electrode line portions 430c and 430d is relatively wider than in the past. . Therefore, the laser cutting process of the third or fourth common electrode line portions 430c and 430d is easily performed without damaging the data lines DLm-1 and DLm. The third or fourth common electrode line portions 430c and 430d are insulated by the laser coating process, thereby causing the third or fourth common electrode line portions 430c and 430d to float. Therefore, the pixel area PA in which the residual defect has occurred can be easily repaired by the laser cutting process.

In addition, since the both ends of the third and fourth common electrode line portions 430c and 430d do not have to be spaced apart from the data lines DLm-1 and DLm in order to facilitate laser cutting, the aperture ratio is improved.

The display substrate 400 further includes a bridge electrode 440 for electrically connecting common electrode lines formed in adjacent pixel regions in a second direction D2. Since the bridge electrode 440 is the same as the bridge electrode 140 of FIG. 1, a detailed description thereof will be omitted.

As described above, according to the present invention, the common electrode line includes a common electrode line facing the pixel electrode to form the storage capacitor. The common electrode line includes second and third common electrode line portions extending in parallel to the data line in the pixel area. The second and third common electrode line portions have a first formation width in a central region and a second formation width smaller than the first formation width at both ends.

Therefore, the present invention has an effect that the laser cutting process can be easily performed because the interval between the data line is widened at both ends of the common electrode line.

In addition, the present invention does not have to be spaced apart from the common electrode line toward the pixel region in order to widen the distance from the data line, thereby improving the aperture ratio.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (9)

A plurality of data lines; A plurality of gate lines formed to intersect the data lines; A pixel electrode formed in a pixel region defined by two data lines and a gate line adjacent to each other; And And a common electrode line facing the pixel electrode in the pixel area, the common electrode line having a first formation width and a second formation width in a region parallel to the data line. The method of claim 1, wherein the common electrode line The first and second widths in the pixel area, the first width in the center of the area parallel to the data line, and at both ends of the area in the pixel area parallel to the data line. A first common electrode line unit having two formation widths; And And a second common electrode line portion adjacent to the gate lines and extending parallel to the gate lines. The display substrate of claim 2, wherein the second formation width is relatively small with respect to the first formation width. The display substrate of claim 2, wherein the first common electrode line part has a shape in which both ends thereof are removed by a predetermined width toward the pixel electrode. The method of claim 2, wherein the first common electrode line part A first-first common electrode line unit adjacent to a data line of a previous stage of the data lines and extending in a direction parallel to the data lines; And And a first-second common electrode line portion adjacent to a corresponding data line among the data lines. The display substrate of claim 2, wherein the second common electrode line portion is formed to be adjacent to a gate line of a previous stage of the gate lines. The method of claim 2, wherein the second common electrode line portion A 2-1 common electrode line part formed to be adjacent to a gate line of a previous end of the gate lines in the pixel area; And And a second-2 common electrode line part formed to be adjacent to a corresponding one of the gate lines in the pixel area. The display substrate of claim 2, wherein the plurality of common electrode lines further comprises a third common electrode line part formed to have a predetermined slope in a direction parallel to the data line. The display substrate of claim 1, wherein the pixel electrode divides the pixel region into a plurality of domains by an opening in which a portion of the pixel electrode is removed.

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