KR20080022716A - Thin film transistor substrate and liquid crystal display having the same - Google Patents

Abstract

A thin film transistor substrate and a liquid crystal display having the same are provided to form repair lines and assistant repair lines at first and second regions, thereby reducing capacitance resulting from signal lines and the repair lines, reducing length of the repair lines, and decreasing voltage drop. A thin film transistor substrate comprises signal lines, first repair lines(20), second repair lines(21), multiple connection pad blocks, assistant repair lines(22,23), and connecting lines(24). The first repair lines are formed along edges of one side of the substrate. The second repair lines are formed along the other regions of the substrate. The connection pad blocks are connected with driving circuits and include connection pads connected with one of the driving circuits. The assistant repair lines are crossed with the signal lines and connected with repaired signal lines. The connecting lines are crossed with the first and second repair lines and the assistant repair lines. One side of the first and second repair lines is connected with the connection pad blocks, and the other side thereof is floated. Thereby, the signal delay resulting from RC delay is prevented.

Description

Thin film transistor substrate and liquid crystal display having the same {THIN FILM TRANSISTOR SUBSTRATE AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a plan view schematically illustrating a repair line formed on a thin film transistor substrate according to an exemplary embodiment of the present invention.

FIG. 3 is an enlarged view illustrating region A shown in FIG. 2.

FIG. 4 is a cross-sectional view taken along the line II ′ of the enlarged view of region A shown in FIG. 3.

<Brief Description of Drawings>

10: liquid crystal panel 11: thin film transistor substrate

12: color filter substrate 20: first repair line

21: second repair line 22: second auxiliary repair line

23: first auxiliary repair line 24: connection line

26: third repair line 27: fourth repair line

30: data connection pad block 40: gate connection pad block

100: pixel electrode 120: circuit board

130: data driving circuit 140: gate driving circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a thin film transistor substrate having a repair line and an auxiliary repair line for preventing RC delay, and a liquid crystal display having the same.

A liquid crystal display device displays an image by adjusting the light transmittance of a liquid crystal having dielectric anisotropy using an electric field. In the liquid crystal display, a color filter substrate on which a color filter array is formed and a thin film transistor substrate on which a thin film transistor array is formed are bonded to each other with a liquid crystal interposed therebetween. A common electrode to which a common voltage is supplied is formed on the front surface of the color filter substrate, and a plurality of pixel electrodes to which data signals are individually supplied to the thin film transistor substrate are formed in a matrix form. Further, the thin film transistor substrate is formed with a thin film transistor for individually driving a plurality of pixel electrodes, a gate line for controlling the thin film transistor, and a data line for supplying a data signal to the thin film transistor.

Since the signal line including the gate line and the data line formed on the thin film transistor substrate is formed to have a fine width of several micrometers or less, disconnection failure may occur. Therefore, the thin film transistor substrate further includes a repair line for repairing the disconnected signal line. In this case, the repair line is formed in a ring shape along the outer edge of the thin film transistor substrate and overlaps a plurality of signal lines with an insulating layer therebetween. When repairing a disconnected signal line, repair the two lines by connecting the repair line and the overlapping line of the signal line by laser welding. However, there is a problem in that signal delay due to post-repair RC delay occurs due to capacitance at the overlapping portion due to the overlap of the repair line and the plurality of signal lines. In addition, since the length of the repair line is long, there is a problem in that a voltage drop of the signal occurs due to an internal resistance inside the repair line.

Therefore, the technical problem to be achieved by the present invention is to form a repair line in each of the first region and the second region, and to provide a repair line connected to the repair line to repair the disconnected signal line, and to repair the repair line and the signal line. The present invention provides a thin film transistor substrate which prevents signal delay due to RC delay due to overlapping and a liquid crystal display having the same.

In order to solve the above technical problem, a signal line formed on the substrate;

A first repair line formed along an outer portion of a region on one side of the substrate divided around any one of the signal lines;

A second repair line separated from the first repair line and formed along an outer side of the remaining area of the divided substrate area;

A plurality of connection pad blocks formed on one side of the signal line and connected to a driving circuit for supplying a driving signal to the signal line, the connection pad being connected to only one of the driving circuits;

An auxiliary repair line formed on the other side of the signal lines to intersect the signal lines connected in units of the connection pad block and connected to a signal line to be repaired during repair; And

And a connecting line formed to intersect the first and second repair lines and the auxiliary repair line to connect the first and second repair lines and the auxiliary repair line during repair. do.

Here, one side of the first and second repair lines is connected to the connection pad block, and the other side is floated.

The first and second repair lines and the auxiliary repair line are formed of a first metal layer, the signal line and the connection line are formed of a second metal layer, and the first metal layer and the second metal layer are different metal layers. Is formed.

In addition, the first and second repair lines are connected to the non-display area between the display area and the connection pad block, respectively, and are formed to intersect with the signal lines and are connected to the repaired signal line during repair of the signal line. A second auxiliary repair line is further provided.

The second auxiliary repair line is formed of the same metal as the first and second repair lines.

In order to solve the technical problem of the present invention, the present invention provides a signal line formed on a substrate, a first repair line formed along an outer region of one side of the substrate divided into any one of the signal lines, and the first A second repair line separated from a repair line and formed along an outer side of the remaining area of the divided substrate, and a driving circuit formed at one side of the signal line and supplying a driving signal to the signal line; A plurality of connection pad blocks including connection pads connected only to one of the driving circuits, and signal lines that are formed to intersect the signal lines connected in units of the connection pad blocks on the other side of the signal lines and are repaired at the time of repair And an auxiliary repair line connected to the first repair line and the first and second repair lines and the auxiliary repair line. And a connection line connecting the first and second repair lines to the auxiliary repair line during repair, and a color filter formed by facing the thin film transistor substrate and the liquid crystal between the thin film transistor substrate. A substrate connected to a substrate, a driving circuit connected to the connection pad block, and one side of the thin film transistor substrate to supply a signal to the driving circuit, and connecting the first repair line and the driving circuit formed in the divided one region. And a circuit board on which a third repair line and a fourth repair line connecting the second repair line and the driving circuit formed in the divided second region are formed.

In this case, the first and second repair lines and the auxiliary repair line are formed of a first metal layer, the signal line and the connection line are formed of a second metal layer, and the first metal layer and the second metal layer are different from each other. It is formed of a metal layer.

And a second connected to each of the first and second repair lines and intersecting the signal lines in a non-display area between the display area and the driving circuit and connected to the repaired signal line when the signal line is repaired. It further comprises an auxiliary repair line.

Here, the second auxiliary repair line is formed of the same metal as the first and second repair lines.

Other technical problems and features of the present invention in addition to the above technical problem will become apparent through the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel 10 including a thin film transistor substrate 11, a color filter substrate 12 formed to face liquid crystals therebetween, and a liquid crystal display. A gate driving circuit 140 and a data driving circuit 130 for supplying a gate driving signal and a data driving signal to the gate line GL and the data line DL formed on the panel 10, the gate driving circuit 140, and A circuit board 120 for supplying an image signal, a control signal, and a power signal to each data driving circuit is provided.

In detail, the color filter substrate 12 may include a black matrix for preventing light leakage, a color filter formed in each region divided by the black matrix, and a pixel electrode 100 formed on the thin film transistor substrate 11 by receiving a common voltage. ) And a common electrode forming a vertical electric field.

The liquid crystal is filled between the thin film transistor substrate and the color filter substrate 12 to rotate by an electric field between the common electrode and the pixel electrode to control light transmittance.

The gate driving circuit 140 sequentially supplies a gate on voltage and a gate off voltage to the gate line GL formed on the thin film transistor substrate 11. The gate driving circuit 140 is connected to the thin film transistor substrate 11 in the form of a gate tape carrier package in which a separate gate driving integrated circuit is mounted on a film, or is formed in the pixel region of the thin film transistor substrate 11. The same process as the transistor may be directly integrated on one side of the thin film transistor substrate 11. In addition, the gate driving circuit 140 may be mounted on one side of the thin film transistor substrate 11 in the form of chip on glass (hereinafter referred to as “COG”).

The data driving circuit 130 supplies a data voltage to the data line DL formed on the thin film transistor substrate 11. To this end, the data driving circuit 130 may be connected to the thin film transistor substrate 11 in the form of a data tape carrier package in which a separate data driving integrated circuit is mounted on a film. In addition, the data driving circuit 130 may be mounted on one side of the thin film transistor substrate 11 in the form of COG.

Here, an example in which the gate driving circuit 140 and the data driving circuit 130 are mounted on the thin film transistor substrate 11 in the form of COG will be described.

 2 is a plan view illustrating a thin film transistor substrate according to an exemplary embodiment of the present invention, FIG. 3 is an enlarged view of a region A shown in FIG. 2, and FIG. 4 is a line II ′ of FIG. 3. It is sectional drawing which shows the cross section cut along. Although the first and second repair lines 20 and 21 illustrated in FIG. 2 are formed to function to repair the disconnected data line DL when the data line DL is disconnected, an example of the drawing is illustrated. When the gate line GL is disconnected, a repair line for repairing the gate line GL may be formed. In this case, the repair line for repairing the gate line may be formed along the outer periphery of the substrate on a substrate divided into two regions based on an arbitrary gate line.

2 to 4, the thin film transistor substrate 11 may include a gate line GL and a data line DL formed on the substrate 11 to cross each other, and a gate line GL and a data line DL, respectively. A thin film transistor connected to the thin film transistor, a pixel electrode 100 connected to the thin film transistor, a first repair line 20 formed along the periphery of the first region, and a first repair line 20 and separated from the second region. A second repair line 21 formed along an outer edge thereof, and a data driving circuit 130 formed at one side of the data line DL to supply a driving signal to the data line DL, and connected to the data driving circuit 130. A plurality of data connection pad blocks 30 including connection pads connected to only one data driving circuit 130 and data lines connected to data connection pad blocks 30 on the other side of the data lines DL. Formed by intersecting with (DL), The first and second repair lines 23 and the first and second repair lines 20 and 21 and the first auxiliary repair line 23 which are connected to the rotor line DL intersect each other to form the first and second repair lines. And a connection line 24 connecting the repair lines 20 and 21 to the first auxiliary repair line 23.

Specifically, in the thin film transistor substrate 11, the gate line GL and the data line DL are formed in an intersecting structure in the display region of the image, and the thin film transistor substrate is connected to the thin film transistor in each pixel region defined by the intersecting structure. The pixel electrode 100 which is individually driven by the transistor is formed. The gate line GL and the data line DL cross each other with the gate insulating layer 15 interposed therebetween. One end of the gate line GL is connected to the gate connection pad block 40 to which the gate driving circuit 140 for supplying the gate driving signal to the gate line GL is connected. In addition, the data line DL is connected to a data connection pad to which one end thereof is connected to a data driving circuit 130 for supplying a data driving signal to the data line DL. The data connection pads are formed for each data connection pad block 30 connected to each of the data driving circuits 130. That is, one data connection pad block 30 is connected to a plurality of data lines DL. Accordingly, one data driving circuit 130 is mounted on one data connection pad block 30.

The first and second repair lines 20 and 21 are formed in the first and second regions bisected on the basis of an arbitrary data line DL. In this case, the first and second regions may include any data line DL connected to any one connection pad of either end of the data connection pad block 30 to which the data driving circuit 130 for driving the data line DL is connected. ) Is based on. That is, when the number of data driving circuits is even in the first and second regions, the first and second regions are divided in half by the number of data driving circuits 130, and the number of data driving circuits 130 is odd. In one case, the number of data driving circuits 130 formed in the first region or the second region may be large.

The first repair line 20 formed along the outer periphery of the substrate is formed in the first region. One end of the first repair line 20 is connected to the data connection pad block 30 and the other end is floated. The first auxiliary repair line 23 is formed to intersect the data line DL connected to each data connection pad block 30 of the first region. The first auxiliary repair line 23 is formed in the non-display area of the other side of the data connection pad block 30. In addition, a connection line 24 intersecting with the first auxiliary repair line 23 and the first repair line 20 is formed. In addition, a second auxiliary repair line 22 is formed in the non-display area between the data connection pad block 30 and the display area to intersect the data line DL. The second auxiliary repair line 22 is connected to any one of the data connection pad blocks 30. As shown in FIG. 4, the first repair line 20 and the first and second auxiliary repair lines 23 and 22 are formed of the same metal on the same plane as the gate line GL and the connection line 24. ) Is formed of the same metal on the same plane as the data line DL. In this case, the connection lines 24 are formed to intersect with the first repair line 20, the first auxiliary repair line 23, and the gate insulating layer 15 therebetween.

Similar to the first region, the second repair line 21 is formed in the second region along the outer portion of the thin film transistor substrate 11. At this time, one end of the second repair line 21 is connected to the data connection pad block 30 and the other end is floated. The first auxiliary repair line 23 is formed to intersect the data line DL connected to each data connection pad block 30 of the second region. The first auxiliary repair line 23 is formed in the non-display area of the other side of the data connection pad block 30. In addition, a connection line 24 intersecting with the first auxiliary repair line 23 and the second repair line 21 is formed. In addition, a second auxiliary repair line 22 is formed in the non-display area between the data connection pad block 30 and the display area. The second auxiliary repair line 22 is connected to any one of the data connection pad blocks 30. Here, the second auxiliary repair lines 22 formed in the first region and the second region are formed to be floated, respectively.

In addition, the second repair line 21 and the first and second auxiliary repair lines 22 formed in the second region are formed of the same metal on the same plane as the gate line GL, and the connection line 24 includes data. It is formed of the same metal on the same plane as the line DL. In this case, the connection lines 24 are formed to cross each other with the second repair line 21, the first auxiliary repair line 23, and the gate insulating layer 15 interposed therebetween.

Here, the first and second repair lines 20 and 21 may be formed in plural. That is, as shown in FIGS. 1 and 2, the first and second repair lines 20a 20b, 21a, and 21b are formed along the outer edge of the substrate 11 to be parallel to each other. In addition, the first and second auxiliary repair lines 23a, 23b, 22a, and 22b may be formed in proportion to the number of the first and second repair lines 20 and 21. In addition, the first and second repair lines 20 and 21 and the first auxiliary repair lines 23a and 23b may be connected to each other in the number of chain lines 24 to be repaired. It may be formed in proportion to the number of). As a result, even if disconnection failure occurs in the plurality of data lines DL, the repair can be performed, so that the number of repairs of the data lines can be increased. In addition, since the first and second repair lines 20 and 21 and the data line DL do not overlap each other, an influence of capacitance due to overlap is prevented, thereby preventing signal delay in the repaired data line.

For example, when disconnection failure is detected in the data line connected to the first data connection pad block 30 (left of FIG. 2) in the data line DL of the first region, the disconnected data line is repaired. To this end, laser welding is performed at each intersection 50 so as to be connected to the first and second auxiliary repair lines 23 and 22 and the first repair line 20 formed to cross the disconnected data lines, respectively. First, an intersection 50 of the first auxiliary repair line 23a formed to intersect one end of the disconnected data line is laser welded to connect the disconnected data line and the first auxiliary repair line 23a. Next, the second auxiliary repair line 22a formed by crossing the disconnected data line is connected to the disconnected data line and the second auxiliary repair line 22a through laser welding. Next, the first repair line 20b selected by selecting one of the first repair lines 20 connected to the data connection pad block 30 connected to the second auxiliary repair line 22a among the first repair lines 20b. ) And the intersection of the connecting line 24b are connected by laser welding. Lastly, the intersection 50 of the first auxiliary repair line 23a connected to the connection line 24b and the disconnected data line is laser-welded. When disconnection failure occurs in the plurality of data lines DL, the plurality of disconnected data lines may be repaired through the above-described method.

On the other hand, the thin film transistor substrate 11 is cut by the cutting line (C) shown in Figure 2 and the circuit board 120 for supplying a signal to the gate driving circuit 140 and the data driving circuit 130 in this area Connect. When the thin film transistor substrate 11 is cut by the cutting line C, the first and second repair lines 20 and 21 are formed in regions where portions of the first and second repair lines 20 and 21 are cut. Part of is disconnected. In this case, third and fourth repair lines 27 for connecting the first and second repair lines 20 and 21 are formed on the circuit board 120.

The circuit board 120 transmits a signal to the gate driving circuit 140 and the data driving circuit 130. This circuit board 120 is formed of a flexible printed circuit board or a printed circuit board. The circuit board 120 includes a third repair line 26 connecting the cutout of the first repair line 20 and a fourth repair line 27 connecting the cutout of the second repair line 21.

Both sides of the third repair line 26 are connected to the cut portions of the first repair line 20 to electrically connect the data driving circuit 130 and the first repair line 20. Both sides of the fourth repair line 27 are connected to the cutouts of the second repair line 21 to electrically connect the data driving circuit 130 and the second repair line 21. As a result, even if the thin film transistor substrate 11 is cut by the cutting line C, the first and second repair lines 20 and 21 are disconnected from the data driving circuit 130. ) May transmit data voltages to both sides of the disconnected data line DL.

On the other hand, the liquid crystal display according to the present invention can control the output of the amplifier provided in the output terminal of the data driving circuit 130 when the data line is disconnected in either one of the first and second regions. That is, the data signal is selectively supplied to the first and second repair lines 20 and 21 connected to the output terminal of the amplifier included in the data driving circuit 130. Accordingly, power consumption can be reduced by not supplying a data signal to a repair line in a region where disconnection has not occurred.

As described above, the thin film transistor substrate and the liquid crystal display device having the same according to the present invention divide the thin film transistor substrate into first and second regions, and the auxiliary layer overlapping the signal lines connected to the repair line and the driving circuit in each region. By forming a repair line separately, capacitance caused by the signal line and the repair line can be reduced. In addition, since the length of the repair line formed for each region is reduced, the voltage drop due to the internal resistance of the repair line can be reduced. Accordingly, the RC delay and the voltage drop during the repair of the signal line are reduced, thereby improving the display quality of the liquid crystal display.

In addition, a repair line and an auxiliary repair line are formed in each of the first and second regions, thereby increasing the number of repaired signal lines, thereby increasing the repair capacity.

When the thin film transistor substrate is cut and the repair line is disconnected from the driving circuit, a circuit board having a separate repair line for connecting the disconnected repair line may be provided to enable repair of the signal line.

The present invention described above will be capable of various substitutions, modifications and changes by those skilled in the art to which the present invention pertains. Therefore, the present invention should not be limited to the above-described embodiments and the accompanying drawings, and the rights thereof should be determined by the claims.

Claims (9)

A signal line formed over the substrate; A first repair line formed along an outer portion of a region on one side of the substrate divided around any one of the signal lines; A second repair line separated from the first repair line and formed along an outer side of the remaining area of the divided substrate area; A plurality of connection pad blocks formed on one side of the signal line and connected to a driving circuit for supplying a driving signal to the signal line, the connection pad being connected to only one of the driving circuits; An auxiliary repair line formed on the other side of the signal lines to intersect the signal lines connected in units of the connection pad block and connected to a signal line to be repaired during repair; And And a connection line formed to intersect the first and second repair lines and the auxiliary repair line to connect the first and second repair lines and the auxiliary repair line during repair. The method of claim 1, The first and second repair lines are thin film transistor substrate, characterized in that one side is connected to the connection pad block and the other side is floating. The method of claim 2, The first and second repair lines and the auxiliary repair line are formed of a first metal layer, the signal line and the connection line are formed of a second metal layer, and the first metal layer and the second metal layer are different metal layers. A thin film transistor substrate, characterized in that formed. The method of claim 1, A second connected to each of the first and second repair lines and intersecting the signal lines in a non-display area between the display area and the connection pad block and connected to the repaired signal line during repair of the signal line; A thin film transistor substrate further comprising an auxiliary repair line. The method of claim 4, wherein And the second auxiliary repair line is formed of the same metal as the first and second repair lines. A signal line formed over the substrate; A first repair line formed along an outer portion of a region on one side of the substrate divided around any one of the signal lines; A second repair line separated from the first repair line and formed along an outer side of the remaining area of the divided substrate area; A plurality of connection pad blocks formed on one side of the signal line and connected to a driving circuit for supplying a driving signal to the signal line, the connection pad being connected to only one of the driving circuits; An auxiliary repair line formed on the other side of the signal lines to intersect the signal lines connected in units of the connection pad block and connected to a signal line to be repaired during repair; And A thin film transistor substrate having a connection line formed to intersect the first and second repair lines and the auxiliary repair line to connect the first and second repair lines to the auxiliary repair line during repair; A color filter substrate formed to face the thin film transistor substrate and a liquid crystal therebetween; A driving circuit connected to the connection pad block; A third repair line and a second repair line connected to one side of the thin film transistor substrate to supply a signal to the driving circuit, and to connect the first repair line and a driving circuit formed in the divided one region; And a circuit board having a fourth repair line connecting the driving circuit formed in the other region. The method of claim 6, The first and second repair lines and the auxiliary repair line are formed of a first metal layer, the signal line and the connection line are formed of a second metal layer, and the first metal layer and the second metal layer are different metal layers. Liquid crystal display characterized in that formed. The method of claim 6, A second auxiliary line connected to each of the first and second repair lines and intersecting the signal lines in a non-display area between a display area and the driving circuit and connected to a signal line repaired during repair of the signal line; A liquid crystal display device further comprising a repair line. The method of claim 8, And the second auxiliary repair line is formed of the same metal as the first and second repair lines.

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