JP2907607B2 - Liquid crystal display panel and manufacturing method thereof - Google Patents

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 panel and a method for manufacturing the same, and more particularly to a method for relieving defects of a liquid crystal display panel.

[0002]

2. Description of the Related Art In recent years, liquid crystal display panels have been actively approached for large-capacity, large-screen display. And, in order to achieve widespread use, realization of a low price is widely demanded.

However, it is extremely difficult to manufacture a panel having no defect over a large screen, and there is a problem that the yield is reduced and the manufacturing cost is high. Therefore, various methods for relieving a defective portion have been adopted. FIG. 3 shows an outline of the rescue procedure. After the liquid crystal panel is formed, the electrical disconnection of the signal wiring constituting the image display area is inspected. Next, it is determined whether or not relief can be performed at the disconnected portion, and the repair operation is performed on the liquid crystal display panel that can be repaired. Conduct the inspection again,
After confirming that the defective portion has been repaired, the liquid crystal display panel is completed.

FIG. 2 is a schematic view showing the structure of a liquid crystal display panel, which is an example of a method for relieving a defect of a conventional liquid crystal display panel.

After the liquid crystal panel is formed, the signal wiring 19 constituting the image display area 9 is inspected for electrical disconnection, and the signal wiring 15 which has detected the disconnection (hereinafter referred to as the rescued signal wiring 15) is disconnected. The portion beyond 16 is cut off by the drive circuit 8 and becomes a display defect. Therefore, the pads 11 and 12 at both ends of the rescue signal wiring 15 and the pads 13 and 14 connected to the rescue wiring 17 are connected by wire bonds 18, respectively. As a result, the pad 12 is located beyond the defective portion 16.
14, the rescue wiring 17 and the pads 13 and 11 are connected to the drive circuit 8 to enable screen display.

[0006]

However, in the above-mentioned conventional example, since there are many crossing points 20 between the signal wiring and the rescue wiring, a short circuit between the wirings is likely to occur, and the capacity of the signal wiring to be relieved becomes large. There is a problem that delay and signal noise increase. In particular, in a large liquid crystal display panel of 10 inches or more, the number of the above-mentioned cross points is extremely large, and the short circuit between the wirings and the capacity of the signal wiring to be rescued are serious problems in relieving the liquid crystal display panel.

The present invention solves the above-mentioned conventional problems, and minimizes the number of crossing points between signal wiring and rescue wiring, thereby reducing the short-circuit between wirings and the capacity of the signal wiring to be relieved. And its remedies.

[0008]

According to the present invention, a plurality of island-shaped relief intermediate pads having a specific shape are formed on a liquid crystal display panel, and a signal to be rescued is formed through these intermediate pads. The liquid crystal display panel is relieved by connecting the wiring and the rescue wiring by wire bonds.

[0009]

In the liquid crystal display panel constructed as described above,
The crossing point between the signal wiring and the rescue wiring is only the point where wire bonding is performed for rescue, the occurrence of short circuit between wirings in the crossing part is reduced, the capacity of the signal wiring to be relieved in the crossing part is also reduced, signal delay and signal Noise can be reduced. Also, since the island-shaped intermediate pad has a unique shape,
The identification is easy, and the workability of wire bonding is improved.

As described above, according to the present invention, reliable and simple remedy is possible, and the defect remedy rate can be easily improved.

[0011]

Embodiments of the present invention will be described below. The outline of the rescue procedure is the same as in the conventional example. FIG. 1 is a schematic diagram showing the configuration of a liquid crystal display panel according to one embodiment of the present invention.

After the liquid crystal panel is formed, the signal lines constituting the image display area are inspected for electrical disconnection, and the detected signal lines 5 (hereinafter, referred to as the rescued signal lines 5) are disconnected from the disconnection portions 6. Are cut off by the drive circuit 8 and display defects occur. Therefore, the pads 1 and 2 at both ends of the signal line 5 to be rescued,
The island-shaped relief intermediate pad 1 in which the pads 3 and 4 connected to the relief wiring 7 are arranged without crossing the signal wiring, respectively.
Connection is made by wire bonding via c, 1d and 2c, 2d. As a result, the pad 2 extends beyond the defective portion 6.
2c, 2d, 4, relief wiring 7, pads 3, 1d, 1
By connecting to the drive circuit 8 through c and 1, screen display becomes possible.

The island-shaped relief intermediate pads 1a, 1a
b, 1c, 1d, 2a, 2b, 2c, 2d have specific shapes different from other pads.

As a result, the intermediate pads can be easily recognized in the manufacturing process, and the productivity is greatly improved.

The island-shaped relief intermediate pad is large enough to be wire-bonded a plurality of times, and the arrangement interval is sufficiently shorter than one stroke of the wire bond. Also, at the time of wire bonding, it is needless to say that only a necessary number of intermediate pads for relief are used, and it is not necessary to use all of them.

[0016]

As described above, according to the present invention, the use of the island-shaped rescue intermediate pad arranged without crossing the signal wiring allows the crossing point between the signal wiring and the rescue wiring to be reduced to the minimum necessary for the rescue. It can be the number of. Particularly, in the case of a large liquid crystal display panel of 10 inches or more, the number of cross points is significantly reduced as compared with the related art, which is effective in reducing the occurrence rate of short circuit between wirings and the wiring capacity.

Further, since the island-shaped relief intermediate pad is large enough to be wire-bonded a plurality of times, and its arrangement interval is sufficiently shorter than one stroke of the wire bond, a large number of defective wirings can be repaired. .

Furthermore, since the shape of the intermediate pad for relief is different from that of the other pads, it is easy to recognize in the manufacturing process, and the productivity is greatly improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a liquid crystal display panel according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional liquid crystal display panel of the present invention.

FIG. 3 is a schematic view of a rescue procedure of the liquid crystal display panel.

[Explanation of symbols]

1, 2 Relief signal wiring pad 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d Relief intermediate pad 3, 4 Relief wiring pad 5 Relief signal wiring 6 Disconnection location 7 Relief wiring 8 Drive circuit 9 Pixel section 11, 12 Signal wiring pad to be rescued 13, 14 Wiring pad for rescue 15 Signal wiring to be rescued 16 Disconnection location 17 Relief wiring 18 Wire bond 19 Signal wiring 20 Cross point between signal wiring and rescue wiring

Continuation of the front page (56) References JP-A-59-210419 (JP, A) JP-A-59-144685 (JP, U) JP-A-1-117621 (JP, U) JP-A-62-1151523 (JP) , U) (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1345

Claims (2)

(57) [Claims] A plurality of signal wirings provided with signal wiring pads to be rescued on a glass substrate outside a liquid crystal panel image display area.
And a relief wiring pad having a structure not intersecting with the signal wiring
Rescue wiring comprising: the signal wiring and the rescue
Multiple conductive materials that are electrically insulated from
A remedy intermediate pad, wherein the remedy intermediate pad is
A rescue signal wiring pad on the signal wiring and the rescue signal
A liquid crystal display panel having a shape different from a rescue wiring pad on a wiring . 2. After the production of the liquid crystal panel according to claim 1,
Among the signal lines constituting the image display area, the electrically disconnected signal lines are detected, and the rescued signal wiring pads and the rescue lines connected to the drive circuit side of the disconnected signal lines are detected. Wire the connected rescue wiring pad to the wire
The signal to be relieved is connected by bonding and connected to the opposite side of the disconnected signal wiring from the drive circuit side.
Another remedy for distribution connected to No. wiring pad and the relief line
A line pad connected by wire bonding, less the
Also, one rescue intermediate pad and the rescue signal wiring pad are rescued.
A method for manufacturing a liquid crystal display panel , wherein the liquid crystal display panel is connected as an intermediary of a used wiring pad .