JPS62147433A - Relieving method for line defect of liquid crystal display panel - Google Patents

Abstract

PURPOSE:To relieve line defects by fitting a printed circuit board for line defect relieving lines on the opposite glass of a liquid crystal display panel and short- circuiting a line defect relieving electrode where a line defects occurs to a line defect relieving line. CONSTITUTION:A line defect relieving line 7 on the printed circuit board 5 for line defect relieving lines fitted on the opposite glass 2 is connected to a line defect relieving electrode 8 at a point B by wiring bonding 10. Then, electrodes 9 for line defect relieving lines at points D and E are connected together by wire bonding 10 in consideration of distance and a line defect relieving electrode 8 at a point G is connected to the line defect relieving line 7 at a point F by wire bonding 10. A signal sent from the point G to the point A is sent from the point B to the point A at the same time to regard a line defect occurring from the point A to the point B as a point defect at the point A. Thus, the number of line defects to be relieved is increased without increasing the number of line defect relieving lines.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for repairing line defects in an active matrix liquid crystal display panel in which thin film transistors are deposited on an array glass in a liquid crystal display panel.

BACKGROUND OF THE INVENTION In recent years, liquid crystal display devices have come into widespread use in television receivers and general electronic devices, and the number of picture elements and electrodes in liquid crystal display devices has been increased, and the electrodes have been made smaller. Along with this, there is a high possibility that there will be a failure in the signal line within the liquid crystal display panel, and it is important to eliminate several line defects in the liquid crystal display panel that occur due to this in terms of productivity, cost, etc. There is.

Hereinafter, an example of the above-mentioned conventional liquid crystal display panel line defect relief method will be described with reference to the drawings.

3 and 4 are exploded perspective views of a liquid crystal display panel device for performing a conventional liquid crystal display panel line defect relief method;
It shows a plan view, a sectional view, and an enlarged view of main parts. In FIG. 3, reference numeral 1 denotes an array glass on which transistors for switching electrical signals of picture elements in a liquid crystal display panel are deposited. , 2 is a counter glass on which a counter electrode is deposited.

3 is an upper polarizing plate that changes the transmission angle of light, and 4 is a lower polarizing plate that also changes the transmission angle of light. Reference numeral 6 denotes a driving IC connecting electrode that electrically connects the liquid crystal display panel and the driving IC. Reference numeral 7 denotes a line defect relief line for electrical connection to the opposite side of the liquid crystal display panel for line defect relief. Reference numeral 8 denotes a line defect relief electrode on the liquid crystal display panel signal line provided for connecting the line defect relief line 7 and the liquid crystal display panel signal line. 1o is a line defect relief electrode 8
This is wire bonding that electrically connects the line defect relief line 7 and the line defect relief line 7. 11 and 12 are wire bonding parts for relieving line defects. 14 is a printed circuit board on which a driving IC is mounted.

The operation of the liquid crystal display panel line defect relief method configured as described above will be explained.

If the signal line in the liquid crystal display panel fails at point A' in Figures 3(b) and 4, and a line defect occurs from point A' to point B'J, the signal will be transmitted from point G' to point B'J. This means that it was being sent to point B. Now, due to a fault in the signal line at point A', the signal from point G' is not being transmitted in the direction from point A' to point B', resulting in a line defect, so the signal is being sent from point G' to point A'. By sending the same signal as the signal from point B' to point B', the line defect from point A' to point B' will become point A'.
Only point defects will occur.

Therefore, the line defect relief line 7 is provided on the printed circuit board 14 to which the driving IC is connected, and after the printed circuit board 14 is connected to the liquid crystal display panel, the line defect relief line 7 is connected to the line defect relief electrode 8 at point G' and point F'.
The line defect relief line 7 is connected by wire bonding 1o.

Then, point B' on the line defect relief electrode 8 opposite to point G' on the signal line G/A/B/, and point C' on the line defect relief line 70 point B' side corresponding to point Fk. Connect with wire bonding 1o. As a result, from point G' to point A
It is possible to simultaneously send the signal sent from point B' to point A', and the line defect occurring in the direction from point A' to point B' can be reduced to a point defect only at point A'. By changing it, line defects were relieved.

Problems to be Solved by the Invention However, with the above configuration, line defects cannot be repaired until the printed circuit board 14 that connects the liquid crystal display panel and the driving xC is connected. At the same time, it has the problem of not being able to repair line defects.
Since the printed circuit board 14 is only bonded with the drive IC connection electrode 6 on the anode glass 1, there is a problem in that stress is generated in the wire bonding 10 between the array glass 1 and the printed circuit board 14. There is.

Furthermore, since the line defect relief lines 7 of the printed circuit board 14 form a ring surrounding the liquid crystal display panel, there is a problem that only the number of line defect relief lines 7 can be relieved. There is.

In view of the above-mentioned problems, the present invention makes it possible to repair line defects even in a single panel of a liquid crystal display, without putting stress on the wire bonding 1o, and with the same number of single defect repair lines 7.
(Liquid crystal display) (liquid crystal display that can repair more line defects)

In order to solve the above-mentioned problems, the liquid crystal display panel line defect relief method of the present invention is a printed circuit board for line defect relief that has line defect relief lines that are broken in several places. is attached to the upper part of the facing glass of the liquid crystal display panel.

Operation The present invention has the above-described configuration, and by wire bonding between the line defect relief line on the line defect relief printed circuit board attached to the upper part of the opposing glass and the line defect relief electrode on the array glass, Line defect relief drives I
This can be done even before connecting the C printed circuit board, and since the line defect relief printed circuit board is identified to the liquid crystal display panel, no stress is applied to the wire bonding.

Furthermore, since the line defect relief line is disconnected at the ridge, by connecting the disconnections at the necessary locations, the unconnected line defect relief line can be used as an independent relief line.

EXAMPLE Hereinafter, a liquid crystal display panel line defect relief according to an example of the present invention will be described with reference to the drawings. FIGS. 1(a), 1(c), and 1(c) respectively show a perspective view, a plan view, and a sectional view of a method for relieving line defects in a liquid crystal display panel. Second
Figures (a) and (b) are partially enlarged views of the line defect wire bonding portion 11.12 and the line defect relief line shorting portion 13, respectively, which are circled in FIG.

In FIGS. 1 and 2, 1 is an array glass, 2 is a counter glass, 3 is an upper polarizing plate, 4 is a lower polarizing plate, 5 is a printed circuit board for a line defect relief line, 6 is an electrode for connecting a drive IC,
7 is a line defect relief line, 8 is a line defect relief electrode, 9 is a line defect relief line shorting electrode, 1o is a wire bonding, 11.12 is a wire bonding part, and 13 is a line defect relief line shorting part.

The operation of the liquid crystal display panel line defect relief method configured as described above will be explained below with reference to FIGS. 1 and 2.

If a signal line in the liquid crystal display panel fails at point A in Figure 2 and a line defect occurs from point A to point B, the signal will be sent from point G to point B. Now, due to a failure in the signal line at point A, the signal line is being switched from point A to point B.
A line defect occurs because the signal from point G does not enter in the direction, so by sending the same signal sent from point G to point A from point B to point A, A line defect in the direction of point B can be made into a point defect only at point A.

Therefore, the line defect relief line 7 on the line defect relief line printed circuit board 5 attached to the upper part of the opposing glass 2 and the point B
and the line defect relief electrode 8 are connected by wire bonding 10. From a distance standpoint, the line defect relief line short-circuit electrodes 9 at two points E are connected by wire bonding 10, and the line defect relief electrodes 8 at point G and the line defect relief line 7 at point F are connected. By connecting with wire bonding 1o, the signal sent from point G to point A can be transferred from point B to point A.
At the same time, the line defect occurring in the direction from point A to point B was treated as a point defect at point A.

At this time, as in the conventional example, the liquid crystal display (channel and drive IC)
There is no need for the printed circuit board to be connected. In addition, since the line defect relief line short-circuiting electrode 8 at the two dotted points E was short-circuited, the opposite half of the same outer line of the line defect relief line remained unused. Line defect relief is also possible, and one line defect relief line 7 may be able to relieve two line defects.

As described above, according to this embodiment, by attaching the printed circuit board 5t for line defect relief having the line defect relief lines 7 which are broken in several places on the upper part of the opposing glass 2, the liquid crystal display panel can be used for line defect relief. This is possible even before connecting the printed circuit board for the drive IC, and since the printed circuit board for line defect relief is attached to the liquid crystal display panel, stress on the wire bonding 1o can also be removed when connected to the liquid crystal display panel. , and the number of net defects that can be repaired can be increased without increasing the number of line defect relief lines.

In this embodiment, the number of line defect relief lines 7 is two, but any other number may be used.

In this embodiment, the line defect relief line 7 has four disconnections, but the disconnections may be any other number and do not need to be concentrated at the same location.

In this embodiment, the shape of the line defect relief line shorting electrode 9 of the line defect relief line 7 is square, but other shapes may be used.

In this embodiment, the shape of the line defect relief electrode 8 is square, but other shapes may be used.

Effects of the Invention By attaching a line defect relief line printed circuit board having line defect relief lines cut in several places on the opposing glass of the liquid crystal display panel, line defect relief for the liquid crystal display panel can be performed even when the liquid crystal panel is alone. This can be done even after the printed circuit board to which the PCB IC is connected is connected to the liquid crystal display panel, and there is no stress on the wire bonding used for liquid crystal display panel line defect relief, and the same number of line defect relief lines can be used. However, it is possible to increase the number of defective lines to be repaired.

[Brief explanation of drawings]

FIG. 1(a) is an exploded perspective view of a liquid crystal display panel device for explaining a liquid crystal display panel line defect relief method in an embodiment of the present invention, FIG. 1(b) is a plan view of the same, and FIG. C)
is a cross-sectional view of the same, Figure 2(a) is an enlarged view of the main part of the small defect relief wire bonding part in Figure 1, Figure 2 (Φ) is an enlarged view of the main part of the short circuit part of the line defect relief line, and Figure 3 is The conventional liquid crystal display panel line defect relief method is as follows: 1... Array glass, 2... Opposing glass, 3... Upper polarizing plate, 4... Lower polarizing plate, 6... Printed circuit board for line defect relief line, 6... Drive IC
Connection electrode, 9... Line defect relief line short-circuit electrode, 1°... Wire bonding, 11.12
...Wire bonding part, 13...
Line defect relief line short-circuit part, 14... Printed circuit board. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure one
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(Figure 3 Figure 4 Procedural amendment writing method) % formula % 1 Display of the case 1985 Patent Application No. 288487 2 Name of the invention Liquid crystal display panel line defect relief method 3 Person making the amendment Relationship to the case Patent Applicant Address: 1006 Oaza Kadoma, Kadoma City, Osaka Name (582) Matsushita Electric Industrial Co., Ltd. Representative: Akio Tanii 4 Agents: 571 Address Matsushita Electric Industrial Co., Ltd. 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture 7. In the 9th line of page 11 of the detailed statement of amendments, "is" will be amended to "Figure 4 is an enlarged view of the same essential parts."

Claims (3)

[Claims] (1) A printed circuit board for line defect relief lines having one or more line defect relief lines with several breaks is attached on the opposing glass of the liquid crystal display panel, and line defect relief electrodes with line defects are attached. A line defect relief method for a liquid crystal display panel in which a line defect is relieved by short-circuiting the line defect relief line. (2) The liquid crystal display panel line defect relief method according to claim 1, wherein the line defect relief electrode and the line defect relief line are short-circuited by wire bonding. (3) The liquid crystal display panel line defect relief method according to claim 1, wherein a disconnected line defect relief line short-circuit portion of the line defect relief line is short-circuited.