JP2003156763A - Liquid crystal display unit and its defect repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display unit and its defect repair method which can repair a defect place relatively easily if the distance from a display part to an edge of a substrate is short and a defect due to a short circuit between a storage capacity bus line batch electrode and a gate bus line crossing it occurs. SOLUTION: A part of a gate bus line 30 is branched into a plurality of wires 30a and 30b and one branch point 30d is arranged overlying the storage capacity bus line batch electrode 36. The storage capacity bus line batch electrode 36 is provided with an opening part 39 where the branch point 30d is exposed. For example, if a wire 30a and the storage capacity bus line batch electrode 36 short-circuit owing to static electricity, the wire 30a is cut by irradiating the circumference of the branch points 30c and 30d with laser light and the cut place is electrically separated from a gate bus line 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device capable of easily repairing a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode outside a display portion, and a defect repairing method thereof.

[0002]

2. Description of the Related Art In recent years, active matrix type liquid crystal display devices include OA (Office Automation) such as personal computers.
) Widely used in equipment, and EWS (Engine
Ring work stations) are becoming larger and finer.

As the liquid crystal display device becomes larger and finer, the horizontal scanning time is shortened and the wiring load capacity is increased, so that the display quality may be deteriorated. In order to avoid this, it is required to further reduce the resistance value of the wiring. In particular, a storage capacitor is provided for each pixel in order to improve the display quality. However, if the resistance value of the storage capacitor bus line that is one of the electrodes of this storage capacitor is high, the display quality such as lateral stroke will be serious. It will cause deterioration. In order to avoid the deterioration of the display quality due to the resistance value of the storage capacitor bus line, the voltage is supplied from both sides of the storage capacitor bus line to reduce the time constant.

FIG. 1 is a plan view showing a liquid crystal display device. The liquid crystal display device includes a TFT substrate 1 on which TFTs (thin film transistors) and pixel electrodes are formed, a CF substrate 2 on which color filters and common electrodes are formed, and a space between these TFT substrate 1 and CF substrate 2. And a liquid crystal that has been formed. A region in which the pixel electrodes are arranged in the horizontal direction and the vertical direction is the display unit 3, and the display unit 3 includes a data bus line and a gate bus line for supplying a display signal to each pixel electrode at a predetermined timing, The above-mentioned storage capacitor bus line and the like are also formed.

Usually, as shown in FIG. 1, the TFT substrate 1 is formed larger than the CF substrate 2. Further, among the four sides of the TFT substrate 1, a plurality of terminal groups are arranged along two sides which do not overlap with the CF substrate 2. The gate bus lines are divided into a plurality of gate bus line groups 4 on the outside of the display unit 3, and each terminal (TAB terminal) of the terminal group arranged along one side (the left side in FIG. 1).
It is connected to the. A TAB board 6 is connected to each of these terminal groups, and these TAB boards 6 are connected to a printed board 8a.

Similarly, the data bus lines are divided into a plurality of data bus line groups 5 on the outer side of the display unit 3 and arranged along the other side (the lower side in FIG. 1). It is connected to each terminal (TAB terminal) of the terminal group. The TAB board 7 is provided in each of these terminal groups.
Are connected, and these TAB boards 7 are printed boards 8b.
Connected to.

FIG. 2 is an enlarged view of a portion surrounded by a broken line circle A in FIG. A plurality of horizontally extending gate bus lines 10 and a plurality of vertically extending data bus lines 11 (only one is shown in FIG. 2) are formed in the display section 3. Each rectangular area partitioned by the gate bus line 10 and the data bus line 11 is a pixel area.

A TFT 12 and a pixel electrode 13 are formed in each pixel region. The gate electrode of the TFT 12 is connected to the gate bus line 10, the drain electrode is connected to the data bus line 11, and the source electrode is connected to the pixel electrode 13. Further, a plurality of storage capacitor bus lines 14 are formed so as to cross the center of each pixel region.

A guard ring 18 is formed on the outside of the display section 3 in which the pixel electrodes 13 are arranged. A protective element 17 is connected between the guard ring 18 and each gate bus line 10 to prevent the TFT 12 from being damaged by static electricity.

A storage capacitor bus line collective electrode 16 (shown by a thick line in the drawing) is formed outside the guard ring 18. Each storage capacitor bus line 14 is electrically connected to the storage capacitor bus line collective electrode 16 via the connection electrode 15 and the connecting portions 15a and 15b. The gate bus line 10 passes below the storage capacitor bus line collective electrode 16 and is bent toward the TAB terminal group at the bent portion 10e.

The gate electrode of the TFT 12, the gate bus line 10 and the storage capacitor bus line 14 are formed on the same conductive layer (first conductive layer), and the source electrode and drain electrode of the TFT 12, the data bus line 11, the guard ring. 18, the storage capacitor bus line collective electrode 16 is formed on the same conductive layer (second conductive layer), and the pixel electrode 13 and the connection electrode 15 are formed on the same conductive layer (third conductive layer). An insulating film is formed between the conductive layers to prevent short circuits between the conductive layers.

By the way, the gate bus line 10 is shown in FIG.
As shown in, the storage capacitor bus line collective electrode 16 intersects. FIG. 3 is a plan view showing an intersection of the gate bus line 10 and the storage capacitor bus line collective electrode 16.
In this portion, if a short circuit occurs due to static electricity or foreign matter during manufacturing, the gate bus line 10 is held at a constant voltage, so that a line defect in the gate bus line direction occurs.

As a method of repairing such a defect, as shown in FIG. 4, a portion of the gate bus line 10 that intersects with the storage capacitor bus line collective electrode 16 is branched into two wirings 10a and 10b in advance. Is proposed.
If a short circuit occurs at the intersection of the gate bus line 10 and the storage capacitor bus line collective electrode 16 due to static electricity or the like during manufacturing, after identifying the short circuit location by inspection by pattern recognition, the shorted wiring (10a Or 10b)
The short-circuited part is electrically separated from the gate bus line 10 of the display section 3 by cutting the vicinity of both side ends of the laser with a laser.

[0014]

However, it is not always possible to detect a short circuit portion between the gate bus line 10 and the storage capacitor bus line collective electrode 16 by inspection by pattern recognition, and an extremely small short circuit that cannot be detected by inspection by pattern recognition. Often occurs. Although it is possible to inspect for a short circuit between the gate bus line 10 and the storage capacitor bus line collective electrode 16 by an electrical inspection, even if the electrical inspection detects a short circuit, the two wirings 10
It cannot be determined which of a and 10b should be cut.

Further, the method shown in FIG. 4 has the following drawbacks. That is, in order to maintain good display quality even if the liquid crystal display device is upsized, it is necessary to keep the resistance value of the storage capacitor bus line collective electrode 16 low. for that reason,
In recent years, there is a tendency to increase the width of the storage capacitor bus line collective electrode 16. In addition, in recent years, in order to reduce the overall size of the display device as much as possible even when the display unit is enlarged, it is required to reduce the area of the portion outside the display unit. In the method as shown in FIG. 4, since the gate bus line 10 has branch points on both sides of the storage capacitor bus line collective electrode 16, a space of about 50 to 150 μm is required. Therefore, the distance from the storage capacitor bus line collective electrode 16 to the edge of the substrate becomes large, and it becomes impossible to meet the market demand.

By extending the branched wiring to the outside of the bent portion 10e (hereinafter, also referred to as "diagonal wiring portion") and arranging one branch point in the diagonal wiring portion, from the storage capacitor bus line to the edge of the substrate. It is also possible to reduce the distance. However, for example, a 15-inch XGA (1024 x 768
Pixel) In the case of a liquid crystal panel, the pitch of the gate bus lines 10 in the display section 3 is about 300 μm, whereas the pitch of the gate bus lines in the diagonal wiring section is about 35 μm, so that the branch point is formed in the diagonal wiring section. Can not be placed.

An object of the present invention is to make the distance from the display section to the edge of the substrate small, and to relatively easily perform when a defect occurs due to a short circuit between the collective electrode of the storage capacitor bus line and the gate bus line intersecting with the collective electrode. An object of the present invention is to provide a liquid crystal display device capable of repairing a defective portion and a defect repairing method thereof.

[0018]

According to another aspect of the present invention, there is provided a liquid crystal display device comprising: a display section in which a plurality of pixels are arranged in a matrix; and a plurality of external connection terminals arranged outside the display section. The thin film transistor formed for each pixel, the pixel electrode and the storage capacitor, and arranged in parallel to each other in the display unit and connected to the gate of the thin film transistor, extending to the outside of the display unit and bent at the bent portion, A plurality of gate bus lines connected to external connection terminals, and a plurality of storage capacitor bus lines arranged in the display unit in parallel with the gate bus lines to connect to the storage capacitors and extending to the outside of the display unit. And a storage capacitor bus line collective electrode that intersects the plurality of gate bus lines with an insulating film interposed therebetween and is commonly connected to the plurality of storage capacitor bus lines. Is divided into a plurality of wirings between a pair of branch points located between the display portion and the bent portion, and at least one of the pair of branch points is arranged at a position overlapping the storage capacitor bus line collective electrode. The storage capacitor bus line collective electrode is provided with an opening that exposes the branch point and the vicinity thereof.

In the present invention, a part of the gate bus line is branched into a plurality of wirings, and both ends of these wirings, that is, at least one of a pair of branch points overlaps the storage capacitor bus line collective electrode. It is located in a position. Thereby, the distance between the display unit and the edge of the substrate can be shortened.

When a short circuit between the gate bus line and the storage capacitor bus line collective electrode is detected by pattern recognition or the like, at least one wiring is left near the branch point and the other wiring is cut by a laser or the like. In this case, in order to cut the wiring at a position overlapping the storage capacitor bus line collective electrode, it is necessary to previously provide an opening in the storage capacitor bus line collective electrode so that the vicinity of the branch point is exposed.

In the liquid crystal display device according to the second aspect of the present application, a display section in which a plurality of pixels are arranged in a matrix, a plurality of external connection terminals arranged outside the display section, and each of the pixels are formed. The thin film transistor, the pixel electrode, and the storage capacitor, which are arranged in parallel with each other in the display unit, are connected to the gate of the thin film transistor, extend to the outside of the display unit, and are bent at a bent portion to be connected to the external connection terminal. A plurality of gate bus lines, a plurality of storage capacitor bus lines which are arranged in parallel with the gate bus lines in the display unit and connected to the storage capacitors, and which extend to the outside of the display unit, and an insulating film are sandwiched therebetween. A storage capacitor bus line collective electrode that intersects the plurality of gate bus lines and is commonly connected to the plurality of storage capacitor bus lines; and the gate between the display portion and the bent portion. An auxiliary wiring formed in parallel with the drain line, at least one of both ends of the auxiliary wiring being disposed so as to overlap the storage capacitor bus line, and the auxiliary wiring for the storage capacitor bus line collective electrode. Is provided with an opening that exposes the end and the vicinity thereof.

In the present invention, an auxiliary wiring parallel to the gate bus line is provided in advance. However, at least one of both ends of the auxiliary wiring is arranged at a position overlapping the storage capacitor bus line. Further, the storage capacitor bus line collective electrode is provided with an opening exposing the end of the auxiliary wiring and the portion of the gate bus line corresponding to the end of the auxiliary wiring.

When a short circuit between the gate bus line and the storage capacitor bus line collective electrode is detected by pattern recognition or electrical inspection, both sides of the short circuit point of the gate bus line are cut by a laser or the like, and the short circuit point is gated. Electrically disconnect from the bus line. Then, the auxiliary wiring and the gate bus line are electrically connected to each other to form a path that bypasses the short-circuited portion.

In order to electrically connect the auxiliary wiring and the gate bus line, it is preferable to previously provide a connection wiring on a region from both ends of the auxiliary wiring to the gate bus line. In this case, the connection wiring, the auxiliary wiring and the gate bus line can be joined (laser welding) by irradiating the overlapping portion of the connection wiring with the auxiliary wiring and the gate bus line.

After forming a contact hole in the insulating film on the auxiliary wiring and the gate bus line by a laser or the like, the auxiliary wiring and the gate bus line are electrically connected by a laser CVD (Chemical Vapor Deposition) method. Wiring may be formed.

A defect repairing method for a liquid crystal display device according to claim 4 is a defect repairing method for a liquid crystal display device, which repairs a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display portion. The gate bus line is branched into a plurality of wirings between a pair of branch points, and at least one of the pair of branch points is arranged inside an opening provided in the storage capacitor bus line collective electrode. Every other time, when a short circuit between the gate bus line and the storage capacitor bus line collective electrode is detected, at least one of the plurality of wirings is left and the other wirings are cut in the vicinity of the branch point. And

In the present invention, the gate bus line is branched into a plurality of wirings between the pair of branch points, and at least one of the pair of branch points is an opening provided in the storage capacitor bus line collective electrode. Place it inside. When a short circuit between the gate bus line and the storage capacitance bus line batch electrode is detected by pattern recognition, etc., the wiring short-circuited with the storage capacitance bus line batch electrode is cut by a laser etc. Electrically disconnect. As a result, the defect is repaired.

In the present invention, at least one of the branch points for branching the gate bus line is arranged at a position overlapping the storage capacitor bus line, so that the distance from the display portion to the edge of the substrate can be shortened.

A defect repairing method for a liquid crystal display device according to claim 5 is a defect repairing method for a liquid crystal display device, which repairs a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display portion. An auxiliary wiring is formed in parallel with the gate bus line, and at least one of both ends of the auxiliary wiring is arranged inside an opening provided in the storage capacitor bus line collective electrode, When a short circuit between a line and the collective electrode of the storage capacitor bus line is detected, the gate bus line is cut at two positions sandwiching the short circuit portion, and the vicinity of the cut portion and the auxiliary wiring are electrically connected. It is characterized by connecting.

In the present invention, the auxiliary wiring is formed in parallel with the gate bus line in advance. However, at least one of both ends of the auxiliary wiring is arranged at a position overlapping the storage capacitor bus line collective electrode, and the storage capacitor bus line collective electrode is provided with an opening exposing the end of the auxiliary wiring and the vicinity thereof. .

When a short circuit between the gate bus line and the storage capacitor bus line collective electrode is detected by pattern recognition or electrical inspection, a short circuit is made to the storage capacitor bus line collective electrode of the gate bus lines by a laser or the like. Both sides of the existing portion are cut to electrically disconnect the short-circuited portion from the gate bus line, and the auxiliary wiring and the gate bus line are electrically connected to each other to form a route that bypasses the short-circuited portion.

In order to electrically connect the auxiliary wiring and the gate bus line, it is preferable to previously provide a connection wiring on a region from both ends of the auxiliary wiring to the gate bus line. In this case, the connection wiring, the auxiliary wiring and the gate bus line can be joined (laser welding) by irradiating the overlapping portion of the connection wiring with the auxiliary wiring and the gate bus line.

After forming a contact hole in the insulating film on the auxiliary wiring and the gate bus line with a laser or the like, a wiring for electrically connecting the auxiliary wiring and the gate bus line is formed by laser CVD. Good.

[0034]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the accompanying drawings.

(First Embodiment) FIG. 5 shows a first embodiment of the present invention.
3 is a plan view showing the liquid crystal display device of the embodiment of FIG. This liquid crystal display device has a TFT having a TFT and a pixel electrode formed thereon.
It is composed of an FT substrate 21, a CF substrate 22 on which a color filter, a common electrode and the like are formed, and a liquid crystal sealed between the TFT substrate 21 and the CF substrate 22.

An area in which the pixel electrodes are arranged in the horizontal direction and the vertical direction is a display section 23. The display section 23 has a data bus line and a gate bus line for supplying a display signal to each pixel electrode at a predetermined timing. Lines and storage capacity bus lines for improving display quality are also formed.

The TFT substrate 21 is formed larger than the CF substrate 22, and of the four sides of the TFT substrate 21,
A plurality of terminal groups are arranged along the two sides that do not overlap the CF substrate 22. A plurality of gate bus lines are provided outside the display unit 23, and a plurality of gate bus lines 2 are provided.
It is divided into four and is connected to each terminal (TAB terminal) of the terminal group arranged along one side (left side in FIG. 5). A TAB board 26 is connected to each of these terminal groups, and these TAB boards 26 are connected to a printed board 28a.

Similarly, a plurality of data bus lines are provided outside the display unit 23, and a plurality of data bus line groups 25 are provided.
And is connected to each terminal (TAB terminal) of the terminal group arranged along the other side (lower side in FIG. 1). A TAB board 27 is connected to each of these terminal groups, and these TAB boards 27 are connected to a printed board 28b.

FIG. 6 is an enlarged plan view showing a portion surrounded by a broken line circle B in FIG. 5, and FIG. 7 shows an intersection of the gate bus line 30 and the storage capacitor bus line collective electrode 36 shown in FIG. It is a schematic diagram which shows. In FIG. 7, the storage capacitor bus line 34, the connection terminal 35, and the like shown in FIG. 6 are omitted.

A plurality of gate bus lines 30 extending in the horizontal direction and a plurality of data bus lines 31 extending in the vertical direction (only one is shown in FIG. 6) are formed in the display section 23. The rectangular areas partitioned by the gate bus lines 30 and the data bus lines 31 are pixel areas. A TFT 32 and a pixel electrode 33 are formed in each pixel region. Further, a plurality of storage capacitor bus lines 34 are formed so as to cross the center of each pixel region. The gate electrode of the TFT 32 is connected to the gate bus line 30, the drain electrode is connected to the data bus line 31, and the source electrode is connected to the pixel electrode 33.

A storage capacitor bus line collective electrode 36 (shown by a thick line in the drawing) is formed outside the display portion 23.
Each storage capacitor bus line 34 is connected to the storage capacitor bus line collective electrode 3 via the connection electrode 35 and the connection portions 35a and 35b.
6 is electrically connected. Gate bus line 30
Passes under the storage capacitor bus line collective electrode 36 and is bent toward the TAB terminal group at the bent portion 30e.

The gate electrode of the TFT 22, the gate bus line 30 and the storage capacitor bus line 34 are formed on the same conductive layer (first conductive layer), and the source electrode and drain electrode of the TFT 32, the data bus line 31, the storage capacitor bus line. The collective electrode 36 is formed on the same conductive layer (second conductive layer), and the pixel electrode 33 and the connection electrode 35 are formed on the same conductive layer (third conductive layer). An insulating film is formed between the conductive layers to prevent a short circuit between the conductive layers.

In the present embodiment also, the display unit 2
A guard ring and a protection element as shown in FIG. 2 may be formed between the storage capacitor bus line collective electrode 36 and the storage capacitor bus line collective electrode 36.

The gate bus line 30 is TA at the bent portion 30e located below the collective electrode bus line collective electrode 36.
It is bent toward the B terminal group. The gate bus line 30 has two wirings 30a and 30 between the two branch points 30c and 30d between the bent portion 30e and the display portion 23.
It is branched to b. One branch point 30c is arranged between the storage capacitor bus line collective electrode 36 and the display unit 23,
The other branch point 30d is the storage capacitor bus line collective electrode 36.
It is located below.

The storage capacitor bus line collective electrode 36 is provided with an opening 39 so that the branch point 30d of the gate bus line 30 and its vicinity are exposed.

The opening 39 needs to have a size capable of selectively cutting one of the wirings 30a and 30b with a laser. For example, the width of the wirings 30a and 30b is 10 μm,
If the space between the wirings 30a and 30b is 50 μm and the space margin required when cutting the wiring by the laser is 10 μm, the size of the opening 39 may be 90 × 90 μm.

In this embodiment, the 19-inch SXGA (1280
The display unit 2 is an example of a liquid crystal panel.
The pitch of the gate bus lines 30 in 3 is about 300μ
m, and the pitch of the TAB terminals is about 140 μm.
The pitch of the diagonal wiring of the gate bus line 30 from the bent portion 30e to the TAB terminal is about 45 μm, the line width of the diagonal wiring portion of the gate bus line 30 is about 20 μm, and the distance between the gate bus lines is about 25 μm. is there.
Further, the width of the storage capacitor bus line collective electrode 36 is 500 μm.
It is about m to 1 mm.

FIG. 8 is a schematic view showing a defect repairing method for the liquid crystal display device of this embodiment. In this figure, the gate bus line 30 (wiring 30a) and the storage capacitor bus line collective electrode 36 are short-circuited at the position indicated by P in the figure.

First, the short-circuited portion P is specified by inspection by pattern recognition. After that, the wiring 30a is connected to the branch points 30c, 3
By cutting at a position indicated by R1 and R2 in the vicinity of 0d in the figure, the short-circuited portion is detected by the gate bus line 30 of the display unit 23.
Electrically separated from. A laser is used to cut the wiring 30a. Further, when cutting the wiring 30a at the position of R2, the wiring 30a is irradiated with a laser through the opening 39. Even if the wiring 30a in which the short circuit has occurred is cut off, it does not become a defect because the TAB terminal and the gate bus line 30 of the display unit 23 are electrically connected via the wiring 30b. In this way, the defect repair is completed.

In this embodiment, an opening 39 is provided in the storage capacitor bus line collective electrode 36, and the opening 39 is formed.
Wiring 30a branching the gate bus line 30 below
Since 30b is arranged, even if one of the wirings 30a and 30b and the storage capacitor bus line collective electrode 36 are short-circuited, the shorted wiring (30a or 3).
Defects can be repaired by cutting 0b) with a laser.

Further, in this embodiment, since the bent portion 30e of the data bus line 30 is arranged below the storage capacitor bus line collective electrode 36, the storage capacitor bus line collective electrode 36 is provided in order to improve the display quality. Even if the width is increased, the distance from the display unit 23 to the edge of the substrate can be reduced.

Further, in the present embodiment, the pattern shapes of the gate bus lines and the storage capacitor bus line collective electrodes are different from those of the conventional liquid crystal display device shown in FIG. 2, so that the number of manufacturing steps is increased. Can be implemented without

In this embodiment, one gate bus line 30 is formed on the storage capacitor bus line collective electrode 36.
Although one opening 39 is provided for each of the gate bus lines 30, as shown in FIG. 9, an opening having a size such that branch points 30d of the gate bus lines 30 are exposed is provided for each of the plurality of gate bus lines 30. May be. In FIG. 9, one opening 39c is provided for every three gate bus lines 30.

(Second Embodiment) FIG. 10 is a plan view showing a liquid crystal display device according to a second embodiment of the present invention. Note that the difference between the present embodiment and the first embodiment is that the pattern shape of the intersection of the storage capacitor bus line collective electrode and the gate bus line is different, and other configurations are basically the first embodiment. 10 is the same as that of the first embodiment, the same components as those in FIG. 6 are designated by the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, the entire two wirings 30a and 30b branching the gate bus line 30 are arranged below the collective capacitance bus line collective electrode 36a. The storage capacitor bus line collective electrode 36a is provided with an opening 39a exposing one branch point 30c and its vicinity and an opening 39b exposing the other branch point 30d and its vicinity.

Also in this embodiment, the wirings 30a, 3
0b and the storage capacitor bus line collective electrode 36
When a is short-circuited with a, the short-circuited portion is specified by inspection by pattern recognition. Then, for example, when the wiring 30a and the storage capacitor bus line collective electrode 36a are short-circuited, the wiring 30a is cut by irradiating the laser through the openings 30c and 30d, and the short-circuited portion is identified by the gate bus line 30 of the display unit 23.
Electrically separated from. This completes the defect repair.

In this embodiment, the same effect as that of the first embodiment can be obtained, and in addition to the storage capacitor bus line collective electrode 36a as compared with the first embodiment.
The width of the storage capacitor bus line collective electrode 3 can be increased.
There is an effect that the deterioration of the display quality due to the resistance of 6a can be more surely avoided. Further, in the present embodiment, since the entire wirings 30a and 30b that branch the gate bus line 30 are arranged below the storage capacitor bus line collective electrode 36a, the distance from the display unit 23 to the edge of the substrate is further increased. There is also an effect that it can be made smaller.

(Third Embodiment) FIG. 11 is a plan view showing a liquid crystal display device according to a third embodiment of the present invention, and FIG. 12 is a gate bus line 30 and a storage capacitor bus line collective electrode shown in FIG. It is a schematic diagram which shows the intersection part with 36. In addition,
The present embodiment is different from the first embodiment in that the pattern shape of the gate bus lines on the outside of the display unit 23 is different, and other configurations are basically the same as those in the first embodiment. Therefore, in FIGS. 11 and 12, the same components as those in FIGS. 6 and 7 are designated by the same reference numerals, and detailed description thereof will be omitted. Further, in FIG. 12, the storage capacitor bus line 34, the connection terminal 35 and the like shown in FIG. 11 are omitted.

In the present embodiment, a defect repairing auxiliary wiring 30f is formed in the vicinity of the gate bus line 30 on the outer side of the display section 23 in parallel with the gate bus line 30. Further, connection wirings 37a and 37b are formed in regions from above both ends of the auxiliary wiring 30f to above the gate bus line 30, respectively. The connection wiring 37a is arranged between the display section 23 and the storage capacitor bus line collective electrode 36, and the connection wiring 37b is arranged inside the opening 39 opened in the storage capacitor bus line collective electrode 36.

The auxiliary wiring 30f is formed in the same wiring layer (first wiring layer) as the gate bus line 30, and the connecting wiring 37 is formed.
a and 37b are formed in the same wiring layer (second wiring layer) as the storage capacitor bus line collective electrode 36. Therefore, there is an insulating film between the auxiliary wiring 30f and the connection wirings 37a and 37b, and the auxiliary wiring 30f and the connection wirings 37a and 37b are connected to each other.
37b is electrically separated.

FIG. 13 is a schematic diagram showing a defect repairing method for the liquid crystal display device of this embodiment. In this figure, P in the figure
The gate bus line 30 and the storage capacitor bus line collective electrode 36 are short-circuited at the position indicated by.

First, the gate bus line 30 short-circuited to the storage capacitor bus line collective electrode 36 is specified by pattern recognition or electrical inspection. After that, the positions R1 and R2 sandwiching the short-circuited portion P are irradiated with a laser to disconnect the gate bus line 30. At this time, at the time of cutting R2, laser irradiation is performed through the opening 39.

Next, the portion where the connection wirings 37a and 37b overlap the gate bus line 30 and the auxiliary wiring 30f is irradiated with a laser to connect the connection wirings 37a and 37b to the gate bus line 30 and the auxiliary wiring 30f. Electrically connect (laser welding). In the figure, reference numeral 38 indicates a connection portion between the connection wirings 37a and 37b, which are connected by laser irradiation, and the gate bus line 30 and the auxiliary wiring 30f.
Also in this case, the connection wiring 37b and the gate bus line 30
When connecting with the auxiliary wiring 30f, laser is emitted through the opening 39. In this way, the defect is repaired.

In this embodiment, the same effect as that of the first embodiment can be obtained, and in addition to the gate bus line short-circuited with the storage capacitor bus line collective electrode 36 by electrical inspection. It is only necessary to specify 30 and there is an advantage that it is not necessary to specify the short-circuited portion by pattern recognition.

The portion where the gate bus line 30 and the auxiliary wiring 30f overlap each other is preferably formed to be slightly thicker than the other portions in consideration of the disappearance of a portion by laser irradiation.

Further, in the present embodiment, the auxiliary wiring 30f is formed in the first conductive layer, and the connecting wirings 37a, 37 are formed.
Although b is formed in the second conductive layer, the conductive layer forming the auxiliary wiring 30f and the connection wirings 37a and 37b is not limited to this. For example, the auxiliary wiring 30f is
It may be formed on the conductive layer, and the connection wirings 37a and 37b may be formed on the third conductive layer.

Also in the present embodiment, the storage capacitor bus line batch electrode 36 is provided with one opening 39 for each gate bus line 30, but one for each of the plurality of gate bus lines 30. The opening 39a may be provided.

(Fourth Embodiment) FIG. 14 is a plan view showing a liquid crystal display device according to a fourth embodiment of the present invention. The difference between the present embodiment and the third embodiment is that the pattern shape of the intersection of the storage capacitor bus line collective electrode and the gate bus line is different, and other configurations are basically the third embodiment. 14, the same components as those in FIG. 11 are designated by the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, the entire auxiliary wiring 30f is arranged below the collective electrode bus line collective electrode 36a. The storage capacitor bus line collective electrode 36a is provided with openings 37a, 37b exposing both ends of the auxiliary wiring 30f and its vicinity and portions of the gate bus line 30 corresponding to both ends of the auxiliary wiring 30f. There is. Further, inside the openings 37a and 37b, connection wirings 37a and 37b whose both ends are located above the auxiliary wiring 30f and the gate bus line 30 are formed, respectively. These connecting wires 37a, 3
7b is formed in the same wiring layer as the storage capacitor bus line collective electrode 36a.

Also in this embodiment, when the gate bus line 30 and the storage capacitor bus line collective electrode 36a are short-circuited by pattern recognition or electrical inspection, the gate bus line 30 is opened through the openings 39a and 39b. Disconnect. Then, the both ends of the connection wirings 37a, 37b are irradiated with a laser, and the connection wirings 37a, 37b and the auxiliary wiring 3
0f and the gate bus line 30 are electrically connected (laser welding). In this way, the defect is repaired.

In the present embodiment, the same effect as that of the third embodiment can be obtained, and in addition to the storage capacitor bus line collective electrode 36a as compared with the third embodiment.
The width of the storage capacitor bus line collective electrode 3 can be increased.
There is an effect that the deterioration of the display quality due to the resistance of 6a can be more surely avoided. In addition, in the present embodiment, since the entire auxiliary wiring 30f is arranged below the storage capacitor bus line collective electrode 36a, the distance from the display unit 23 to the edge of the substrate can be further reduced. is there.

(Fifth Embodiment) FIG. 15 is a plan view showing a liquid crystal display device according to a fifth embodiment of the present invention. The present embodiment is different from the third embodiment in that connection wiring is not provided, and other configurations are basically the same as those in the third embodiment. Therefore, in FIG. 11, the same parts as those in FIG. 11 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, similarly to the third embodiment, the auxiliary wiring 30f is formed in parallel with the gate bus line 30 in advance. However, the connection wiring 37a,
37b is not formed.

FIG. 16 is a schematic diagram showing a defect repairing method for the liquid crystal display device of this embodiment. In this figure, P in the figure
The gate bus line 30 and the storage capacitor bus line collective electrode 36 are short-circuited at the position indicated by.

When a short circuit occurs between the gate bus line 30 and the storage capacitor bus line collective electrode 36, the gate bus line 30 is cut by a laser at positions R1 and R2 sandwiching the short circuit point P.

After that, the connection wiring 37 on the both ends of the connection wirings 37a and 37b and the connection wiring 37 of the gate bus line 30.
Laser is irradiated onto the portions corresponding to both ends of a and 37b to form contact holes 40 in the insulating film. In this laser irradiation, the gate bus line 30 and the auxiliary wiring 3
Since the purpose is to form the contact hole 40 without melting 0f, a short wavelength laser is used.
For example, the third harmonic of the YAG laser (wavelength 355 nm)
Alternatively, the fourth harmonic (wavelength 266 nm) is used.

Next, by the laser CVD method, the wiring 41 which connects both ends of the connection wirings 37a and 37b and the gate bus line 30 is formed. Specifically, W (tungsten) organic metal, Mo (molybdenum) organic metal or C
The wiring 41 is formed by continuously irradiating a YAG laser having a wavelength of 355 nm while locally flowing Ar (argon) gas containing r (chromium) organometal. Also in this embodiment, the same effect as that of the third embodiment can be obtained.

Also in this embodiment, one gate bus line 3 is connected to the storage capacitor bus line collective electrode 36.
Although one opening 39 is provided for each 0, one opening 39c may be provided for each of the plurality of gate bus lines 30 as shown in FIG.

(Sixth Embodiment) FIG. 17 is a plan view showing a liquid crystal display device according to a sixth embodiment of the present invention. This embodiment is different from the third embodiment in that the storage capacitor bus line collective electrode is composed of two strip electrodes, and other configurations are basically the third embodiment. 17, the same components as those in FIG. 11 are designated by the same reference numerals and detailed description thereof will be omitted.

In the present embodiment, the storage capacitor bus line collective electrode is two strip-shaped electrodes 36 which are parallel to each other.
b, 36c. However, these strip electrodes 36b and 36c are electrically connected to each other in a place not shown. That is, the present embodiment is an example in which only one opening is provided for all gate bus lines 30.

An auxiliary wiring 30f for defect repair is formed below the strip electrode 36a arranged on the side closer to the display section 23. One end of the auxiliary wiring 30f has the display unit 2
3 and the strip electrode 36a, and the other end is disposed between the strip electrodes 36a and 36b. Further, connection wirings 37a and 37b are formed in regions from above both ends of the auxiliary wiring 30f to above the gate bus line 30, respectively.

Also in the present embodiment, when the short circuit between the gate bus line 30 and the storage capacitor bus line collective electrode (strip electrode 36a) is detected by pattern recognition or electrical inspection, the positions where the strip electrode 36 is sandwiched. The gate bus line 30 is cut by a laser at the
Defects can be repaired by connecting 7b to the gate bus line 30 and the auxiliary wiring 30f (laser welding). Also in this embodiment, the same effect as that of the third embodiment can be obtained.

(Supplementary Note 1) A display section in which a plurality of pixels are arranged in a matrix, a plurality of external connection terminals arranged outside the display section, a thin film transistor, a pixel electrode, and a storage capacitor formed for each pixel. A plurality of gate bus lines arranged in parallel to each other in the display unit and connected to the gate of the thin film transistor, extending outside the display unit and bent at a bent portion to connect to the external connection terminal, A plurality of storage capacitor bus lines that are arranged in parallel with the gate bus line in the display portion and connected to the storage capacitor, and extend to the outside of the display portion; and a plurality of gate bus lines that sandwich an insulating film. Storage gates of the storage capacitor bus lines that intersect each other and are commonly connected to the plurality of storage capacitor bus lines are provided, and the gate bus line is located between the display portion and the bent portion. Between a pair of branch points is branched into a plurality of wirings, at least one of the pair of branch points is arranged at a position overlapping the storage capacitor bus line collective electrode, and the storage capacitor bus line collective electrode is provided with the branch point and A liquid crystal display device, characterized in that an opening is provided to expose the vicinity thereof.

(Supplementary Note 2) The liquid crystal display device according to Supplementary Note 1, wherein the bent portion is arranged at a position overlapping the collective capacitance bus line collective electrode.

(Supplementary Note 3) A display section in which a plurality of pixels are arranged in a matrix, a plurality of external connection terminals arranged outside the display section, a thin film transistor, a pixel electrode and a storage capacitor formed for each pixel. A plurality of gate bus lines arranged in parallel to each other in the display unit and connected to the gate of the thin film transistor, extending outside the display unit and bent at a bent portion to connect to the external connection terminal, A plurality of storage capacitor bus lines that are arranged in parallel with the gate bus line in the display portion and connected to the storage capacitor, and extend to the outside of the display portion; and a plurality of gate bus lines that sandwich an insulating film. Storage capacitor bus line collective electrodes that intersect and are commonly connected to the plurality of storage capacitor bus lines;
An auxiliary wiring formed in parallel with the gate bus line between the display portion and the bent portion, wherein the auxiliary wiring is arranged at a position where at least one of both ends of the auxiliary wiring overlaps the storage capacitor bus line. The storage capacitor bus line collective electrode is provided with an opening that exposes an end of the auxiliary wiring and the vicinity thereof.

(Supplementary Note 4) The liquid crystal display device according to Supplementary Note 3, further comprising a pair of connection wirings formed on a region from both ends of the auxiliary wiring to the gate bus line.

(Supplementary note 5) The liquid crystal display device according to supplementary note 4, wherein the connection wiring is formed in the same wiring layer as the storage capacitor bus line collective electrode.

(Supplementary note 6) The liquid crystal display device according to supplementary note 3, wherein the bent portion is arranged at a position overlapping the storage capacitor bus line collective electrode.

(Supplementary Note 7) In a defect repairing method of a liquid crystal display device for repairing a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display part, a pair of branch points of the gate bus line are Between the plurality of wirings, and at least one of the pair of branch points is arranged inside the opening provided in the storage capacitor bus line collective electrode, and the gate bus line and the storage capacitor bus line are provided. A defect repairing method for a liquid crystal display device, wherein when a short circuit with a collective electrode is detected, at least one of the plurality of wirings is left and the other wirings are cut in the vicinity of the branch point.

(Supplementary Note 8) The defect repairing method for a liquid crystal display device according to Supplementary Note 7, wherein the gate bus line is bent at a bent portion that overlaps the storage capacitor bus line collective electrode.

(Supplementary Note 9) In a defect repairing method of a liquid crystal display device for repairing a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display portion, an auxiliary wiring is provided in parallel with the gate bus line. At least one of both ends of the auxiliary wiring is formed inside an opening provided in the storage capacitor bus line collective electrode, and the gate bus line and the storage capacitor bus line collective electrode are short-circuited. Is detected, the gate bus line is cut at two positions sandwiching a short-circuited portion, and the vicinity of the cut portion and the auxiliary wiring are electrically connected, which is a defect of the liquid crystal display device. How to repair.

(Supplementary Note 10) For the connection between the vicinity of the cut portion and the auxiliary wiring, a laser is applied to an overlapping portion of the connection wiring and the auxiliary wiring, which are previously formed in the same wiring layer as the storage capacitor bus line. 10. The defect repairing method for a liquid crystal display device according to appendix 9, which is performed by

(Supplementary Note 11) The connection between the vicinity of the cut portion and the auxiliary wiring is performed by forming a wiring connecting the gate bus line and the auxiliary wiring by a laser CVD method. 9. The method for repairing defects of the liquid crystal display device according to item 9.

(Supplementary Note 12) The defect repairing method for a liquid crystal display device according to Supplementary Note 9, wherein the gate bus line is bent at a bent portion that overlaps the storage capacitor bus line collective electrode.

[0095]

As described above, according to the present invention,
At least one of a pair of branch points for branching a part of the gate bus line into a plurality of wirings, or at least one of both ends of the auxiliary wiring is arranged at a position overlapping the storage capacitance bus line collective electrode, and the storage capacitance bus line collective electrode is arranged. Since the opening is provided to expose the branch point and its vicinity or the end of the auxiliary wiring and its vicinity, the distance from the display section to the edge of the substrate can be shortened, and the gate bus line and the storage area can be accumulated. It is possible to repair a defect caused by a short circuit with the capacitive bus line collective electrode.

As a result, it is possible to improve the manufacturing yield of the liquid crystal display device in which the area of the display section is large and the distance from the display section to the edge of the substrate is short.

[Brief description of drawings]

FIG. 1 is a plan view (prior art) showing a liquid crystal display device.

FIG. 2 is an enlarged view (prior art) of a portion surrounded by a dashed circle A in FIG.

FIG. 3 is a plan view (prior art) showing an intersection of a gate bus line and a storage capacitor bus line collective electrode.

FIG. 4 is a plan view showing an example of a conventional defect repairing method for a liquid crystal display device.

FIG. 5 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention.

6 is an enlarged plan view showing a portion surrounded by a broken line circle B in FIG.

FIG. 7 is a schematic diagram showing an intersection of the gate bus line and the storage capacitor bus line collective electrode shown in FIG.

FIG. 8 is a schematic diagram showing a defect repairing method for the liquid crystal display device according to the first embodiment.

FIG. 9 is a plan view showing a modified example of the liquid crystal display device of the first embodiment.

FIG. 10 is a plan view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 11 is a plan view showing a liquid crystal display device according to a third embodiment of the present invention.

12 is a schematic diagram showing an intersection of the gate bus line and the storage capacitor bus line collective electrode shown in FIG.

FIG. 13 is a schematic diagram showing a defect repairing method for a liquid crystal display device according to a third embodiment.

FIG. 14 is a plan view showing a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 15 is a plan view showing a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 16 is a schematic diagram showing a defect repairing method for a liquid crystal display device according to a fifth embodiment.

FIG. 17 is a plan view showing a liquid crystal display device according to a sixth embodiment of the present invention.

[Explanation of symbols]

1, 21 ... TFT substrate, 2, 22 ... CF substrate, 3, 23 ... Display section, 4, 24 ... Gate bus line group, 5, 25 ... Data bus line group 6, 7, 26, 27 ... TAB substrate, 8a , 8b, 28a, 28b ... Printed circuit board, 10, 30 ... Gate bus line, 10e, 30e ... Bent portion 11, 31 ... Data bus line, 12, 32 ... TFT, 13, 33 ... Pixel electrode, 14, 34 ... Storage Capacitance bus line, 15, 35 ... Connection electrode, 15a, 15b, 35a, 35b ... Connection part, 16, 36, 36a ... Storage capacitance bus line collective electrode, 17 ... Protection element, 18 ... Guard ring, 30a, 30b ... Wiring , 30c, 30d ... Branching point 30f ... Auxiliary wiring, 36b, 36c ... Strip electrodes (storage capacitor bus line collective electrode), 37a, 37b ... Connection wiring, 39, 39a 39 b, 39c ... opening, 40 ... contact hole 41 ... wiring.

Claims (5)

[Claims] 1. A display unit in which a plurality of pixels are arranged in a matrix, a plurality of external connection terminals arranged outside the display unit, a thin film transistor, a pixel electrode, and a storage capacitor formed for each pixel, A plurality of gate bus lines that are arranged in parallel in the display unit and are connected to the gates of the thin film transistors, extend outside the display unit, and are bent at a bent portion and connected to the external connection terminal; A plurality of storage capacitor bus lines that are arranged in parallel with the gate bus lines and connected to the storage capacitors, and that extend to the outside of the display unit, and intersect the plurality of gate bus lines with an insulating film interposed therebetween. ,
A plurality of storage capacitor bus line collective electrodes commonly connected to the plurality of storage capacitor bus lines, wherein the gate bus line has a plurality of branch points located between the display section and the bent section. Branched into wiring,
At least one of the pair of branch points is disposed at a position overlapping the storage capacitor bus line collective electrode, and the storage capacitor bus line collective electrode is provided with an opening exposing the branch point and the vicinity thereof. Characteristic liquid crystal display device. 2. A display unit in which a plurality of pixels are arranged in a matrix, a plurality of external connection terminals arranged outside the display unit, a thin film transistor, a pixel electrode, and a storage capacitor formed for each pixel, A plurality of gate bus lines that are arranged in parallel in the display unit and are connected to the gates of the thin film transistors, extend outside the display unit, and are bent at a bent portion and connected to the external connection terminal; A plurality of storage capacitor bus lines that are arranged in parallel with the gate bus lines and connected to the storage capacitors, and that extend to the outside of the display unit, and intersect the plurality of gate bus lines with an insulating film interposed therebetween. ,
A storage capacitor bus line collective electrode commonly connected to the plurality of storage capacitor bus lines; and an auxiliary wiring formed in parallel with the gate bus line between the display section and the bent section, At least one of both ends of the auxiliary wiring is arranged so as to overlap the storage capacitor bus line, and the storage capacitor bus line collective electrode is provided with an opening for exposing the end of the auxiliary wiring and the vicinity thereof. A liquid crystal display device characterized by the above. 3. The liquid crystal display device according to claim 2, further comprising a pair of connection wirings formed on a region from both ends of the auxiliary wiring to the gate bus line. 4. A defect repairing method for a liquid crystal display device, which repairs a defect due to a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display unit, wherein a pair of branch points of the gate bus line are provided between a pair of branch points. The gate bus line and the storage capacitor bus line collective electrode are branched into a plurality of wirings, and at least one of the pair of branch points is arranged inside an opening provided in the storage capacitor bus line collective electrode. When at least one of the plurality of wirings is left and the other wiring is cut in the vicinity of the branch point, a defect repairing method for a liquid crystal display device is characterized. 5. A defect repairing method for a liquid crystal display device, which repairs a defect caused by a short circuit between a gate bus line and a storage capacitor bus line collective electrode on the outside of a display portion, wherein an auxiliary wiring is formed in parallel with the gate bus line. In addition, at least one of both ends of the auxiliary wiring is arranged inside an opening provided in the storage capacitor bus line collective electrode, and a short circuit between the gate bus line and the storage capacitor bus line collective electrode is detected. When this is done, the gate bus line is cut at two positions sandwiching a short-circuited portion, and the vicinity of the cut portion and the auxiliary wiring are electrically connected, and a defect repairing method for a liquid crystal display device. .