JPH07199209A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a reliable liquid crystal display device capable of excellently keeping the electric connection of the conduction parts of respective electrodes on both substrates even in the case of exerting force from the outside under high-temperature and high-humidity environment. CONSTITUTION:This liquid crystal display device is provided with two substrates 1 and 2 arranged in opposite to each other, and the electrode part for external connection 3 is formed on the lower substrate 2 and electrically connected to the electrode part for connection 5 of the upper substrate 1 through the conductive filler 9 of an up-and-down conduction means 10. Plural aperture parts 3a are formed at the parts of both electrode parts 3 and 5 electrically connected through the filler 9. Since the sealing agent 8 of the means 10 infiltrates in the aperture parts 3a and 5a and comes in contact with the lower surface of the substrate 1 and the upper surface of the substrate 2, contact force(adhesive force) between the filler 9 and the respective electrode parts 3 and 5 becomes stronger by as much as the increase of the contact area of the sealing agent 8 with the respective substrates.

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.

[0002]

2. Description of the Related Art As a conventional liquid crystal display device, for example,
As shown in FIG. 2A, the two substrates (the upper substrate 1 and the upper substrate 1 that are opposed to each other and are bonded to each other with the sealant 100 interposed therebetween).
01 and the lower substrate 102), and the external connection electrode portion 1
03 is formed on the lower substrate 102, and the external connection electrode portion 1
It is known that 03 and the connecting electrode portion 105 of the electrode 104 formed on the upper substrate 101 are electrically connected via a conducting agent (vertical conducting means) 106. Here, the electrode portions 103 and 105 and the electrode 104 are made of ITO (indium).
tin oxide), and a silver paste, a carbon paste, or the like is used as the conducting agent 106. As another conventional technique, as shown in FIG. 2 (b), as the vertical conduction means, a mixture of conductive particles (conductive filler) 108 in a sealant 107 is used, and two substrates 101,
A liquid crystal display device is known in which 102 is attached via a sealant 107, and the external connection electrode portion 103 and the connection electrode portion 105 are electrically connected via conductive particles 108. ing.

[0003]

However, as shown in FIG.
In the above-described conventional technique shown in (a), the conductive agent 106 is easily peeled off from the external connection electrode portion 103 or the connection electrode portion 105 by applying an external force to the substrate 101 or the substrate 102, so that the conduction between the both electrode portions 103, 105. There was a problem that defects were likely to occur. Further, in the above-described conventional technique shown in FIG. 2B, when a polymer film (resin film) is used for the substrates 101 and 102, the sealing agent 107 is used.
(This sealant 107 is in contact with the lower surface of the upper substrate 101 and the upper surface of the lower substrate 102 at a place other than the external connection electrode portion 103 and the connection electrode portion 105.) Adhesive force to the electrode 10
The adhesive strength to 3,105 is significantly different (the peel strength to the polymer film is about 1 kgf / cm, and the peel strength to the electrode part made of ITO is 70 g).
f / cm), that is, the sealant 107
Is applied to the external connection electrode section 103 and the connection electrode section 105 at the adhesive force, and the sealant 107 is applied to each substrate 10.
Since the adhesive force is much smaller than the adhesive force of the portion contacting with 1, 102, under high temperature and high humidity environment, the sealing agent 107 is likely to be partially peeled off due to external force, and moisture may enter the peeled portion. There is a problem in that this portion has a high resistance and is likely to cause poor conduction. This invention was made by focusing on the problems of the above-mentioned conventional technology,
The problem is to provide a highly reliable liquid crystal display device that can maintain good electrical connection between the conductive parts of the electrodes of both substrates even when external force is applied under high temperature and high humidity environment. That is.

[0004]

In order to achieve the above-mentioned object, a liquid crystal display device according to the present invention has two substrates arranged so as to face each other, and an external connection electrode portion has the above-mentioned two substrates. The external connection electrode portion is formed on one side of the substrate
In a liquid crystal display device electrically connected to a connecting electrode portion of an electrode formed on the other of the substrates by means of vertical conduction means, at least either the external connecting electrode portion or the connecting electrode portion. A plurality of openings are provided in one of the portions that are electrically connected through the vertical conduction means.

[0005]

In the liquid crystal display device described above, a plurality of openings are provided in at least one of the external connection electrode portion and the connection electrode portion, which is electrically connected through the vertical conduction means. By the configuration, since the vertical conduction means enters into the plurality of openings and contacts at least one of the substrates,
As the contact area increases, the adhesion force (adhesive force) between the vertical conduction means and the external connection electrode portion or the connection electrode portion increases, and the vertical conduction means is less likely to peel off from both electrode portions.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A shows a main part of a liquid crystal display device according to an embodiment of the present invention. The liquid crystal display device is shown in FIG.
As shown in (a), it has two substrates (upper side substrate 1 and lower side substrate 2) arranged to face each other. On the upper surface of the lower substrate 2, an external connection electrode portion 3 which is an input terminal portion is provided.
And a display electrode 4 are formed. On the other hand, on the lower surface of the upper substrate 1, an electrode 7 having a connecting electrode portion 5 and a display electrode portion 6 is formed.

As shown in FIGS. 1 (a) and 1 (b), a plurality of openings 3a and 5a are formed in the electrically connected portions of the external connection electrode portion 3 and the connection electrode portion 5. Each is formed. In this embodiment, three openings 3
Three rows are formed in the width direction in which a and 5a are arranged in a row at intervals. Such a plurality of openings 3a and 5a
The external connection electrode portion 3 and the connection electrode portion 5 having are formed by photolithography.

The external connection electrode portion 3 and the connection electrode portion 5
A sealant 8 is formed in a portion electrically connected to the sealant, that is, in a portion where the openings 3a and 5a are formed.
Further, a vertical conduction means 10 in which a conductive filler (conductive particles) 9 having the same diameter as the gap agent (not shown) is mixed as a conductive agent is provided. The conductive filler 9 is a spherical particle having a diameter of about 1 to 10 μm according to the gap of the liquid crystal cell (liquid crystal display device), and is a metal particle or a particle obtained by coating a resin particle with a metal. The sealant 8 is made of, for example, an epoxy thermosetting resin.

In FIG. 1A, reference numerals 11 and 12 are alignment films, and reference numeral 13 is a liquid crystal. The display electrode 4
And the display electrodes 6 are arranged in a matrix. The liquid crystal display device having the above structure is processed into an LCD panel as shown in FIG.

In the liquid crystal display device having the above structure, when a polymer film (resin film) is used for each of the substrates 1 and 2, due to the characteristics of the sealant 8, the substrates 1 and 2 are similar to the case of the above-mentioned prior art. 1A, even if the adhesive force to the electrode parts and the adhesive force to the electrode parts 3 and 5 are significantly different, as shown in FIG. Upper substrate 1 at a place other than the electrode portion 5
Is in contact with the lower surface of the lower substrate 2 and the upper surface of the lower substrate 2, and each of the openings 3a of the external connection electrode portion 3 and the connection electrode portion 5,
Since it enters the inside of 5a and contacts the lower surface of the upper substrate 1 and the upper surface of the lower substrate 2, the contact area between the sealant 8 and each surface of the upper substrate 1 and the lower substrate 2 increases, that is,
As the contact area between the sealant 8 and the electrode portions 3 and 5 decreases, the adhesive force (adhesive force) between the conductive filler 9 and the electrode portions 3 and 5 increases. As a result, even in the environment of high temperature and high humidity, even if a force is applied from the outside, the conductive fillers 9 are unlikely to be separated from the electrode portions 3 and 5, and the conductive fillers 9 are electrically conducted through the conductive fillers 9. Good electrical continuity is maintained between the external connection electrode portion 3 and the connection electrode portion 5, and a highly reliable liquid crystal display device can be obtained.

FIG. 1C shows a modified example of the above-mentioned one embodiment. In this modification, the external connection electrode portion 3 and the connection electrode portion 5 are electrically connected to each other 3
The shapes of A and 5A are circular. In addition, in each of the portions 3A and 5A, a circular opening 3b in the center portion,
5b and four fan-shaped openings 3c, 5 located outside the openings 3b, 5b and arranged at substantially equal intervals in the circumferential direction.
c and are formed. The other structure is the same as that of the above-mentioned one embodiment.

According to the above-described embodiment, since the plurality of openings 3a and 5a are provided in both the external connection electrode portion 3 and the connection electrode portion 5, each conductive filler 9 and each electrode portion are provided. The adhesion force (adhesion force) with 3 and 5 is large, and as a result, the electrical connection between the external connection electrode part 3 and the connection electrode part 5 that are electrically connected through the conductive fillers 9 is established. Keeps good.

In the above embodiment, a plurality of openings 3a are formed in both the external connection electrode portion 3 and the connection electrode portion 5, respectively.
And 5a are provided, the present invention is not limited to such a configuration, and the plurality of openings may be provided in at least one of the external connection electrode part 3 and the connection electrode part 5. Good.

In the above embodiment, the vertical conducting means 1
Although 0 is used as the sealant 8 in which a conductive filler (conductive particle) 9 having the same diameter as the gap agent (not shown) is mixed as a conductive agent, the present invention is not limited to this. For example, as the conducting means, as shown in FIG.
In addition to the sealant, a conducting agent such as a silver paste or a carbon paste may be used as in the above-mentioned related art. Even in this case, since the conducting agent enters the openings 3a and 5a and contacts the lower surface of the upper substrate 1 and the upper surface of the lower substrate 2, the adhesive force (adhesive force) between the conducting agent and each electrode portion 3 and 5 is increased. ) Becomes large, which makes it difficult for the conducting agent to peel off from the electrode portions 3 and 5.

[0015]

As described above, according to the present invention, a plurality of openings are provided in at least one of the external connection electrode portion and the connection electrode portion, which is in contact with the vertical conduction means. According to this configuration, the vertical conduction means enters into the plurality of openings and contacts at least one substrate. Therefore, the vertical conduction means and the external connection electrode portion or the connection electrode portion are increased by the increase in the contact area. The adhesion force (adhesion force) becomes large, and the vertical conduction means is difficult to peel off from both electrode portions. Therefore, even if a force is applied from the outside under a high temperature and high humidity environment, the electrical connection of the conductive portions of the electrodes of both substrates can be maintained well, and the reliability is improved.

[Brief description of drawings]

FIG. 1A is a longitudinal sectional view showing a main part of a liquid crystal display device according to an embodiment of the present invention. (B) is FIG. 1 (a)
It is a top view of the electrode part shown in FIG. FIG. 1C is a plan view of an electrode portion used in a modification of the embodiment shown in FIG. 1A.

FIG. 2A is a vertical sectional view showing a conventional liquid crystal display device. (B) is a longitudinal sectional view showing another conventional example.

[Explanation of symbols]

 1 Upper Substrate 2 Lower Substrate 3 External Connection Electrodes 3a, 3b, 3c Openings 5 Connection Electrodes 10 Vertical Conducting Means

Claims (1)

[Claims] 1. Having two substrates arranged to face each other,
An external connection electrode portion is formed on one of the two substrates,
In the liquid crystal display device, wherein the external connection electrode portion is electrically connected to the connection electrode portion of the electrode formed on the other of the two substrates via the vertical conduction means, at least the external connection electrode portion. A liquid crystal display device, wherein a plurality of openings are provided in a portion electrically connected through the vertical conduction means in either one of the connection section and the connection electrode section.