JP2000338512A - Liquid crystal display panel and its interelectrode shorting inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily check the presence or absence of a shorting between the transparent electrodes of even-number-th or odd-number-th when inspecting the presence or absence of a shorting by impressing inspection voltage to the transparent electrode of any of even number-th or odd-number-th. SOLUTION: In the case at least the two first and second specific transparent electrodes 4 and 5 belonging to the same group of the even number group or odd number group of one transparent electrode substrate 10 are arranged in proximity apart a slight spacing in the prescribed portions, the third specific transparent electrode 2k belonging to the group different from the group of the first and second specific transparent electrodes is so formed that a portion thereof intrudes into the spacing between the first and second specific transparent electrodes 4 and 5.

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 inspecting short-circuits between electrodes thereof, and more particularly, to a method for detecting even-numbered or odd-numbered transparent electrodes among transparent electrodes formed on a substrate. The present invention relates to a technique capable of easily checking the presence or absence of a short circuit.

[0002]

[Prior art] The pitch between transparent electrodes is becoming increasingly narrower due to the higher definition of electrode patterning technology.
Even a small amount of foreign matter may cause a short circuit between the electrodes. For this reason, a short circuit check is always performed in the manufacturing process of the liquid crystal display panel.

In the case of a liquid crystal display panel of a dot matrix type display, an inspection voltage is applied simultaneously to even-numbered or odd-numbered transparent electrodes among transparent electrodes formed in stripes. If there is no short circuit, every other transparent electrode lights up. If there is a short circuit, the three adjacent transparent electrodes are lit at that portion.

In the above example, the inspection is performed after assembling the liquid crystal display panel. When the inspection is performed on the transparent electrode substrate alone, the inspection voltage is simultaneously applied to the even-numbered or odd-numbered transparent electrodes. This is the same as before, but the transparent electrode on the side to which the inspection voltage is not applied is hit by a conductive checker or the like, and the point where the voltage is output is detected as the short-circuited point.

[0005]

According to this inspection method, a short circuit between an even number and an odd number can be checked, but a short circuit between even numbers or odd numbers cannot be checked.

This will be described by taking a liquid crystal display panel for a telephone as an example. FIG. 3 is a plan view schematically showing one transparent electrode substrate 1 of the liquid crystal display panel. In the case of a telephone, usually, a variable display dot matrix display 2 and a fixed display icon display 3 are provided. Is provided.

On the icon display section 3, icon display patterns such as characters, pictograms, and various figures are formed.
It is drawn to the terminal 1a side through the inside.

When a short circuit is checked, the number of lead-out electrodes of the icon display unit 3 is added to the number of electrodes of the dot matrix display unit 2. That is, the inspection voltage is also applied to the routing electrodes of the icon display unit 3 depending on whether it is an even number or an odd number.

FIG. 2 shows two icon display patterns 4 and 5 as the display patterns of the icon display section 3. However, these are arranged close to each other with a slight gap therebetween. If the routing electrodes 4a, 5a of the 4, 5 are arranged at the same even or odd number, even if the icon display patterns 4, 5 are short-circuited, it cannot be determined.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to apply a test voltage to one of an even-numbered or odd-numbered transparent electrode and determine whether or not there is a short circuit. In addition to the short-circuit check between even-numbered and odd-numbered LCDs, it is possible to easily check for short-circuits between even-numbered or odd-numbered transparent electrodes and short-circuits between the electrodes. An object of the present invention is to provide an inspection method.

According to the present invention, the object includes a pair of transparent electrode substrates on which transparent electrodes are formed, and the one transparent electrode substrate has at least one of an even-numbered group and an odd-numbered group belonging to the same group. In a liquid crystal display panel in which predetermined portions of two first and second specific transparent electrodes are arranged close to each other with a slight gap therebetween, the first and second specific transparent electrodes are provided in the gap between the first and second specific transparent electrodes. This is achieved by forming such that a part of the third specific transparent electrode belonging to a different group from the second specific transparent electrode enters.

For example, if a conductive foreign object is present across the first and second specific transparent electrodes or if the first and second specific transparent electrodes are connected due to poor etching, etc. A part of the third specific transparent electrode is thereby connected to the first and second specific transparent electrodes.

Therefore, for example, if the inspection voltage is applied simultaneously to the first and second specific transparent electrodes in the even-numbered group, the inspection voltage is applied to the third specific transparent electrode belonging to the odd-numbered group to which no voltage is applied. Therefore, it can be seen that the first and second specific transparent electrodes are short-circuited.

In this case, it is preferable that a portion of the third specific transparent electrode is formed so as to divide the gap over the entire length thereof, whereby a short-circuit check can be performed more reliably.

The "small gap" between the first and second specific transparent electrodes is a width that is highly likely to be short-circuited by a foreign substance mixed in the panel. For reference, a width approximately equal to or slightly larger than the pitch between the stripe electrodes of the dot matrix display type is exemplified, but the scope of the present invention is not affected by the size of the width.

The present invention also includes an invention as a method for inspecting a short circuit between electrodes. That is, its structural features are:
A pair of transparent electrode substrates each having a transparent electrode formed thereon, wherein the one transparent electrode substrate has at least two predetermined portions of the first and second specific transparent electrodes belonging to the same group of the even-numbered group or the odd-numbered group; Are arranged close to each other with a slight gap therebetween, and when inspecting the presence or absence of a short circuit between the first and second specific transparent electrodes, a third group belonging to a different group from the first and second specific transparent electrodes is used.
A part of the specific transparent electrode is formed so as to enter into the gap between the first and second specific transparent electrodes, and the pair of transparent electrode substrates are bonded to each other via a peripheral sealing material;
After the liquid crystal is sealed in the cell gap, an inspection voltage is applied to either one of the even-numbered group and the odd-numbered group, and the display state of the first, second, and third specific transparent electrodes is changed according to the display state. It is to inspect whether there is a short circuit between the first and second specific transparent electrodes.

The inspection voltage is applied to either the even-numbered group or the odd-numbered group, but it is preferable to apply the inspection voltage to the group to which the third specific transparent electrode belongs.

According to this, when both the first and second specific transparent electrodes are turned on, the first and second specific transparent electrodes are stochastically set.
It can be determined that a short circuit has occurred between the specific transparent electrodes. When only one of the first and second specific transparent electrodes is turned on, it is possible to determine that a short circuit has occurred between the specific transparent electrode and the adjacent transparent electrode. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to an embodiment shown in FIG. FIG. 1 is a plan view schematically showing one transparent electrode substrate of a liquid crystal display panel for a telephone, similar to the example of FIG. 2 described above, and is considered to be the same as the conventional example of FIG. The components have the same reference numbers.

This transparent electrode substrate 10 also has a variable display dot matrix display 2 and a fixed display icon display 3.
Are provided. In the dot matrix display section 2,
A large number of transparent electrodes 2a to 2n are formed in a stripe shape in parallel with each other.

Icon display patterns such as characters, pictograms, and various figures are formed on the icon display section 3. FIG. 1 shows the same as the conventional example of FIG.
Only two icon display patterns 4 and 5 are shown.

The respective icon display patterns 4 and 5 are arranged close to each other with a small gap (predetermined width) G, and the respective lead electrodes 4a and 5a are connected to the dot matrix display section 2.
Through the appropriate space between the transparent electrodes 2a to 2n.

Therefore, each icon display pattern 4,
The five routing electrodes 4a and 5a are apparently included in the transparent electrodes 2a to 2n of the dot matrix display unit 2, and are counted as the number of the electrodes when a short-circuit check inspection voltage is applied.

Here, for example, assuming that the lead electrodes 4a, 5a of the respective icon display patterns 4, 5 are arranged at an even number of 2 × n (n is an integer) in the terminal portion 1a, the lead electrodes 4a, 5a The transparent electrode 2k for the dot matrix display section 2 belonging to the odd-numbered number is selected for short-circuit checking and is formed so that its tip 21k enters the gap G between the icon display patterns 4 and 5.

The tip 21k is formed so as to divide the gap G between the icon display patterns 4 and 5 over the entire length of the gap G between the icon display patterns 4 and 5. Preferred for assurance.

In the terminal portion 1a, when the number of the lead electrodes is counted from the end, the icon display patterns 4,
In the case where each of the routing electrodes 4a and 5a of No. 5 belongs to an odd number, an even number is selected as the transparent electrode 2k for short-circuit checking.

In this embodiment, since the inspection voltage is simultaneously applied to the even-numbered transparent electrodes at the time of the short-circuit check, the leading electrodes 4 of the icon display patterns 4 and 5 are applied.
The even-numbered transparent electrodes including a and 5a are connected to the bus M, respectively. Each odd-numbered transparent electrode is separated from the bus M.

The transparent electrode substrate 10 is bonded to a counterpart transparent electrode substrate (not shown) via a peripheral sealing material, and a predetermined liquid crystal is sealed in the cell gap. This liquid crystal panel manufacturing process may be in accordance with a standard method.

After manufacturing the liquid crystal panel in this way,
A short circuit check is performed. That is, a predetermined inspection voltage is applied to each even-numbered transparent electrode via the bus M.
If there is no short circuit at any point, each even-numbered transparent electrode is lit (for a positive display, for example, black display,
In the case of the negative type, for example, white display is performed), and the icon display patterns 4 and 5 are also turned on.

That is, if every other lighting line appears, it is determined that there is no short-circuited part, whereas if three adjacent lines are lit, it is determined that there is a short-circuited part.

By the way, the icon display patterns 4 and 5
Is lit even if there is no short circuit between them, even if there is a short circuit, but when the icon display patterns 4 and 5 are short circuited, the odd-numbered transparent electrode 2k for short circuit check is lit. Therefore, it can be determined that there is a short circuit between the icon display patterns 4 and 5.

That is, the cause of the short circuit between the icon display patterns 4 and 5 is that a foreign object exists between them and that the icon display patterns 4 and 5 are connected due to poor etching. However, in any case, the short-circuited portion crosses the tip 21k of the transparent electrode 2k, whereby the transparent electrode 2k comes into electrical contact with the icon display patterns 4 and 5.

Therefore, the odd-numbered transparent electrodes 2k,
3 of the even-numbered transparent electrodes 2k-1 and 2k + 1 on both sides thereof
Since these lines are lit continuously, it is determined that there is a short circuit. However, whether the short circuit has occurred between the icon display patterns 4 and 5, whether the odd-numbered transparent electrode 2k and the even-numbered transparent electrodes 2k-1 and 2k-2 on both sides of the odd-numbered transparent electrode 2k.
Whether it occurs between k + 1 and n + 1 depends on, for example, visual inspection through a microscope.

Unlike the above example, an inspection voltage may be applied to each odd-numbered transparent electrode. In this case,
If both of the icon display patterns 4 and 5 are turned on, it is determined that there is a short circuit therebetween. Of course, the routing electrodes 4a and 5a of the icon display patterns 4 and 5
And the transparent electrodes adjacent thereto are also short-circuited at the same time, the icon display patterns 4 and 5 are both lit. However, since the probability of this occurrence is extremely low, there is a short circuit between the icon display patterns 4 and 5. There is no problem to judge.

When only one of the icon display patterns 4 and 5 is turned on, it can be determined that a short circuit has occurred between the leading electrode and the transparent electrode adjacent thereto. After the short-circuit check, the terminal portion 1 where the bus M is formed
A part of a is cut off from the cutting line C.

In the above embodiment, the short-circuit check is performed after the liquid crystal display panel is manufactured. However, the short-circuit check can be performed on the transparent electrode substrate 10 alone before the panel is manufactured.

That is, an inspection voltage is applied to, for example, each even-numbered transparent electrode via the bus bar M. In this case, for example, a contact pin such as a conduction checker is applied to each odd-numbered transparent electrode, and Check for voltage. When the voltage of the transparent electrode 2k for short circuit check is output, it is determined that there is a short circuit between the icon display patterns 4 and 5.

Next, a modification of the present invention will be described with reference to FIG. In this modification, there are provided six transparent electrodes 21 to 26 formed in a hook-shaped pattern, and the first to third transparent electrodes 21 to 21 counted from the left side among these.
23 is a rightward pattern.

On the other hand, each of the fourth to sixth transparent electrodes 24 to 26 has a small leftward pattern so as to enter the third transparent electrode 23. They are arranged to face each other. Also in this modified example, at the time of checking for a short circuit between the transparent electrodes, the inspection voltage is simultaneously applied to the even-numbered or odd-numbered transparent electrodes.

Therefore, in order to make it possible to check for a short circuit between the third transparent electrode 23 and the fifth transparent electrode 25 belonging to the same odd number, in this example, the sixth transparent electrode 2 is used.
The tip 26 a of the sixth transparent electrode 23 extends to between the third transparent electrode 23 and the fifth transparent electrode 25. Note that the tip of the fourth transparent electrode 24 may be extended between the transparent electrodes 23 and 25.

[0041]

As described above, according to the present invention,
The transparent electrode substrate includes a pair of transparent electrode substrates, and one of the transparent electrode substrates has at least two predetermined portions of the first and second specific transparent electrodes belonging to the same group of the even-numbered group or the odd-numbered group. In a liquid crystal display panel which is arranged closely with a small gap, a third specific transparent electrode belonging to a group different from the first and second specific transparent electrodes is provided in a gap between the first and second specific transparent electrodes. When a test voltage is applied to either the even-numbered or odd-numbered transparent electrodes to check for a short circuit due to the formation of a part of it, not only the short-circuit check between the even-numbered and odd-numbered transparent electrodes but also the even-numbered It is also possible to easily check whether there is a short circuit between the transparent electrodes of the third or odd numbers.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a modification of the present invention.

FIG. 3 is a schematic plan view for explaining a problem of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transparent electrode board 1a Terminal part 2 Dot matrix display part 2a-2n Transparent electrode 2k Transparent electrode selected for short circuit check 3 Icon display part 4,5 Icon display pattern

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Morihara 91 Yoganuki-cho, Miyoshi-shi, Hiroshima Hiroshima Opto Co., Ltd. F term (reference) 2G014 AA03 AB21 AC07 AC15 2H088 FA13 HA02 JA04 MA20 2H092 GA05 GA13 GA33 GA37 MA56 NA30 QA06

Claims (4)

[Claims] A first transparent electrode substrate on which at least two first and second specific groups belonging to the same group of the even-numbered group or the odd-numbered group are included. In a liquid crystal display panel in which a predetermined portion of a transparent electrode is disposed in close proximity with a slight gap, the gap between the first and second specific transparent electrodes includes the first and second specific transparent electrodes. A liquid crystal display panel comprising a part of a third specific transparent electrode belonging to a different group. 2. The liquid crystal display panel according to claim 1, wherein a portion of the third specific transparent electrode is formed so as to divide the gap over its entire length. 3. A transparent electrode substrate comprising a pair of transparent electrode substrates on which a transparent electrode is formed, wherein the one transparent electrode substrate has at least two first and second identifications belonging to the same group of the even-numbered group or the odd-numbered group. A predetermined portion of the transparent electrode is closely arranged with a slight gap therebetween, and the method for inspecting the short-circuit between electrodes of the liquid crystal display panel for inspecting the presence or absence of a short circuit between the first and second specific transparent electrodes, A part of a third specific transparent electrode belonging to a group different from the second specific transparent electrode is formed so as to enter into the gap between the first and second specific transparent electrodes, and the pair of transparent electrode substrates are peripherally sealed. After adhering to each other via a material and sealing liquid crystal in the cell gap, an inspection voltage is applied to either one of the even-numbered group and the odd-numbered group. The first, the display state of the second and third specific transparent electrode, the first, short circuit between electrodes testing method of the liquid crystal display panel, characterized in that to inspect the presence or absence of a short circuit between the second specific transparent electrode. 4. The method according to claim 3, wherein an inspection voltage is applied to a group to which the third specific transparent electrode belongs.