JPH09329795A - Liquid crystal display panel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate static electricity produced in a substrate via a conductive part and a conductor by forming a pair of conductors along an outer periphery between a pair of substrates and providing two or more conductive parts for conducting the pair of conductors. SOLUTION: Four conductive parts 15 are formed in conductors 14 respectively formed in first and second glass boards 10 and 11. Each conductive part 15 forms a part of the conductor 14, is formed to be in a part for passing of a sealing material and two conductors 15 are made to be conductive via a conductive material. Thus, by providing grounded conductors 14 along the outer periphery of a liquid crystal panel and two or more conductive parts between the first and second glass boards, no static electricity load is placed inside the conductors 14 and, even if the protective seats of polarizing plates provided in the outer sides of the first and second glass boards 10 and 11 are peeled off or stuck, produced static electricity is surely eliminated through the conductive parts 15, the conductors 14 and ground lines 13.

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 having a structure capable of removing an electrostatic charge accumulated on a transparent substrate of a liquid crystal display panel or applied by an external factor without adversely affecting a peripheral driving circuit. And a method for manufacturing the same.

[0002]

2. Description of the Related Art Today, liquid crystal display panels have been further advanced in low voltage driving, low power consumption, thinness and light weight compared to conventional display devices, and are used in many electric appliances such as AV equipment and OA equipment. There is. Conventionally, zebra rubber, heat seals, clip pins, etc. have been the mainstream as the method of mounting the terminal conductors of the liquid crystal display panel and the liquid crystal driving LSI (the method of connecting to the printed circuit board), but it has attempted to achieve further miniaturization. In this case, there are limits to how to implement these. 1 of that realization
The number is the LSI directly on the glass substrate
This is a COG (Chip on Glass) method of connecting chips.

FIG. 4 shows a typical example of a liquid crystal display device.
The liquid crystal display device generally includes a liquid crystal display panel 20, a drive circuit section 21, and a connection body 22. In the liquid crystal display panel 20, a first glass substrate 23 on which a first transparent electrode 25 is formed and a second glass substrate 24 on which a second transparent electrode 26 is formed are sealed with a spacer (adhesive). It is made by inserting liquid crystal 29 between two glass substrates 23 and 24 by an injection method or a dropping method. The thickness of the glass substrates 23 and 24 is about 1 mm, and the distance between the two glass substrates 23 and 24 is about 6 μm.
It is. After enclosing the liquid crystal 29, a polarizing plate 31 with a protective sheet 30 is attached to the outer surfaces of the glass substrates 23 and 24.

On the other hand, the drive circuit section 21 is composed of the printed circuit board 3
It is made by mounting the driving LSI 33 and other circuit components on the device 2. The liquid crystal display panel 20 and the drive circuit unit 21 manufactured respectively are connected to each other by a connector 22. An anisotropic conductive sheet is used to connect the connection body 22, the liquid crystal display panel 20, and the drive circuit section 21. The liquid crystal display device manufactured in this manner is exposed to electrostatic stress during the manufacturing process. In particular, in the final quality inspection, it is largely due to human visual inspection,
Every time the inspection is performed, the work of peeling or sticking the protective sheet 30 on the polarizing plate 31 is frequently repeated.

[0005]

As described above, the COG
Since the quality inspection of the liquid crystal display device by the construction method is finally a visual inspection by human eyes, the protective sheet 3
You have to peel off or stick 0. Of course, the polarizing plate 31 is also an insulating sheet, and it is a known fact that a large amount of static electricity is generated when two insulating sheets are separated. Further, the output terminal of the driving LSI 33 is directly connected to the liquid crystal display panel 20, but the resistance of the liquid crystal 29 is high, so that the electric circuit is extremely weak against noise. For the above reason, when a large amount of static electricity generated when the protective sheet 30 is peeled off passes through the glass edge and reaches the output terminal of the driving LSI 33, the driving LSI 3
It causes the electrostatic damage of 3. In fact, the first cause of defects in the liquid crystal display device manufacturing process is due to static electricity.

The present invention has been made in view of the above problems, and it is possible to reduce static electricity defects by surely removing static electricity not only during the manufacturing process but also after the device is assembled, and the manufacturing thereof. It is intended to provide a method.

[0007]

According to another aspect of the present invention, there is provided a liquid crystal display panel, wherein a pair of conductor portions are formed along an outer circumference between a pair of substrates, and two or more conducting portions are provided to electrically connect the pair of conductor portions. It is characterized by that. According to the liquid crystal display panel of the first aspect, the static electricity generated on the substrate can be removed through the conducting portion and the conductor portion.

According to another aspect of the liquid crystal display panel of the present invention, a pair of substrates bonded together with a sealing material mixed with a conductive material, and a pair of conductor portions formed along the outer periphery of the sealing material between the pair of substrates. And a conductive portion which is formed at two or more places of the pair of conductive portions and which hangs on the seal material and conducts the pair of conductive portions via the conductive material. According to the liquid crystal display panel of the second aspect, the static electricity generated on the substrate can be removed through the conducting portion and the conductor portion.

According to a third aspect of the present invention, in the liquid crystal display panel according to the first or second aspect, the area of the conducting portion is set to 1 mm ² or more. According to the liquid crystal display panel of the third aspect, by setting the area of the conducting portion to be 1 mm ² or more, the static electricity generated on the substrate can be more surely removed. A method of manufacturing a liquid crystal display panel according to claim 4, wherein a pair of substrates are bonded together with a sealing material mixed with a conductive material, and a pair of conductors are formed along an outer periphery of the sealing material between the pair of substrates. A conductive portion is formed at two or more locations of the pair of conductor portions so as to hang on the seal material and to conduct the pair of conductor portions through the conductive material.

According to the liquid crystal display panel manufacturing method of the fourth aspect, it is possible to obtain a liquid crystal display panel capable of removing static electricity generated on the substrate through the conducting portion and the conductor portion. Further, since the conductive material is mixed in advance with the sealing material to manufacture, the line operation loss can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a liquid crystal display panel which constitutes a liquid crystal display device. A II-II 'sectional view of FIG. 1 is shown in FIG. 2 and a III-III' sectional view is shown in FIG. The detailed sectional view of the liquid crystal display device is the same as the example shown in FIG.

1 to 3, 10 is a first glass substrate, 11 is a second glass substrate, and 12 is a driving LS.
I and 13 are earth lines, and 17 is a sealing material. The conductive material 16 made of a metal ball is mixed in the sealing material 17 in advance. As the metal sphere, for example, Au, A
Particles made of metal such as g, Cu, Ni or the spacer 27 (see FIG. 4) interposed between the first and second glass substrates 10 and 11 is plated with Au, Ag, Cu, Ni or the like. Conductive particles are used.

Reference numeral 14 denotes the first glass substrate 10 and the second glass substrate 10.
2 is a pair of conductor portions formed along the outer periphery of the sealing material 17 between the glass substrates 11. Conductor part 14
Is for removing static electricity applied to the liquid crystal display device, and both ends of the conductor portion 14 formed on the first glass substrate 10 are connected to the ground line 13, respectively. The conductor portion 14 is formed of, for example, ITO (Indium-Tin-Oxide).

Conducting portions 15 are formed at four locations on the conductor portions 14 formed on the first glass substrate 10 and the second glass substrate 11, respectively. The conducting portion 15 forms a part of the conductor portion 14 and is formed so as to hang on a portion through which the sealing material 17 passes, and both conducting portions 15 are electrically conducted via the conducting material 16. Next, the static electricity application test will be described. That is, a charge of 5 kV was applied from each of the first glass substrate 10 side and the second glass substrate 11 side, actual driving was performed, and a display defect due to LSI breakdown was observed. In the test, 1 to 5 conductive portions 15 are provided, and the area of the conductive portion 15 in each number is 0.1 to 2.0 mm.
Ten liquid crystal display devices each having a variable value of ² were manufactured. Table 1 shows the results.

[0015]

[Table 1]

From the above test results, the number of conducting portions 15 must be two or more, and the effective area of the conducting portions is
It was also found that the effect cannot be fully exhibited unless the thickness is at least 1.0 mm ² . Further, the number of connecting points between the conductor portion 14 and the ground line 13 is not sufficient at one point, and at least two points are necessary to surely remove static electricity.

As described above, the grounded conductor portion 14 is provided along the outer periphery of the liquid crystal display panel, and the first and second conductor portions 14 are provided.
By providing the conducting portions 15 at two or more places between the glass substrates 10 and 11, the polarizing plate provided on the outer surfaces of the first and second glass substrates 10 and 11 is not applied with an electrostatic load inside the conductor portion 14. Even if you remove or attach the protective sheet of
The generated static electricity can be reliably removed through the conducting portion 15, the conductor portion 14, and the earth line 13. Therefore, it is possible to reliably remove static electricity not only during the manufacturing process but also after the device is incorporated, protect the LSI mounted on the liquid crystal display panel from static electricity, and prevent the LSI malfunction.
It is possible to reduce static electricity defects and dramatically improve the yield.

Further, since the conductor portion 14 is provided outside the sealing material 17, a wide bonding area between the substrates 10 and 11 can be secured, and the bonding is stable. The conductor portion 14 is
Also, it may be formed so as to cover the outer peripheral end faces of the second glass substrates 10 and 11. Further, in the above-described embodiment, the conductive material 16 is mixed in the seal material 17 in advance, the conductive portion 15 that hangs on the seal material 17 is formed in the conductor portion 14, and the conductive material 16 is used to connect the conductive portions 15 to each other. However, the present invention is not limited to such a configuration. For example, the sealing member 17 may be formed with a protruding portion that hangs on the conductor portion 14, and the overlapping portion of the sealing material 17 and the conductor portion 14 may be used as the conducting portion. Further, the conductive portion 15 formed on the conductor portion 14 does not hang on the seal material 17, and a conductive member is separately interposed between the both conductive portions 15, or the conductive portion 15 itself is the conductor portion 14 of both substrates 10, 11. It may be a member made of a conductive member provided in between.

Further, the structure of the present invention can be applied to not only the COG-mounted liquid crystal display device but also all existing liquid crystal display panels at low cost.

[0020]

According to the liquid crystal display panel of the first aspect, the static electricity generated on the substrate can be removed through the conducting portion and the conductor portion, and the LSI malfunction can be prevented.
The effect of reducing static electricity defects can be obtained. According to the liquid crystal display panel of the second aspect, static electricity generated on the substrate can be removed through the conducting portion and the conductor portion, LSI malfunctions can be prevented in advance, and static electricity defects can be reduced.

According to the liquid crystal display panel of claim 3,
By setting the area of the conductive portion to 1 mm ² or more, static electricity generated on the substrate can be removed more reliably, LSI malfunction can be prevented, and static electricity defects can be reduced. According to the liquid crystal display panel manufacturing method of the fourth aspect, it is possible to obtain a liquid crystal display panel capable of removing static electricity generated in the substrate through the conducting portion and the conductor portion. Further, since the conductive material is mixed in advance with the sealing material for manufacturing, it is possible to obtain the effect of reducing the line operation loss.

[Brief description of 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 sectional view taken along the line II-II ′ of FIG.

FIG. 3 is a sectional view taken along the line III-III ′ of FIG.

FIG. 4 is a sectional view of a general COG-mounted liquid crystal display device.

[Explanation of symbols]

 10 First Glass Substrate 11 Second Glass Substrate 12 Driving LSI 13 Earth Line 14 Conductor 15 Conducting Part 16 Conducting Material 17 Sealing Material

Claims (4)

[Claims] 1. A liquid crystal display panel comprising: a pair of conductors formed along an outer circumference between a pair of substrates; and two or more conducting portions for connecting the pair of conductors. 2. A pair of substrates bonded together with a sealing material mixed with a conductive material, a pair of conductor portions formed along an outer periphery of the sealing material between the pair of substrates, and the pair of conductors. A liquid crystal display panel, comprising: a conductive portion which is formed at two or more positions of a portion and which is hung on the sealing material and electrically connects the pair of conductive portions through the conductive material. 3. The liquid crystal display panel according to claim 1, wherein the conductive portion has an area of 1 mm ² or more. 4. A step of bonding a pair of substrates with a seal material mixed with a conductive material; a step of forming a pair of conductor portions along an outer periphery of the seal material between the pair of substrates, A method of manufacturing a liquid crystal display panel, comprising the step of forming a conducting portion which is hooked on the sealing material at two or more locations of a pair of conductor portions and which conducts the pair of conductor portions via the conducting material.