JP2001281691A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the possibility that electrical short-circuit or disconnection are generated in an electrode formed on a transparent insulating film. SOLUTION: Respective parts different from each other in the peripheral direction of a sealing member 2 for sealing a liquid crystal 10 are formed, so as to be opposed to either the transparent insulating films 4A or 4B and transparent electrodes 8A and 8B formed on the transparent insulating films 4A and 4B and terminals 9B and 9A on transparent substrates 1A and 1B are electrically connected by a transferring material 13 mixed with the sealing material 2.

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 used for a display utilizing liquid crystal, and more particularly to a liquid crystal display member such as a color filter, a reflection film, and a diffusion film which is covered with a transparent insulating film. The present invention relates to an improvement in a liquid crystal display device having the following structure.

[0002]

2. Description of the Related Art First, an example of a schematic configuration of a conventional color type liquid crystal display device will be described with reference to FIG.

In FIG. 7, a liquid crystal display device has two transparent substrates 1A and 1B made of a material such as glass or plastic, which are arranged substantially in parallel at an interval.
A sealing material 2 is provided along the outer peripheral portion between the two transparent substrates 1A and 1B.

A color filter 3 is disposed on the lower surface of the upper transparent substrate 1A.
To protect the color filter 3, the color filter 3
A transparent insulating film 4A having a planar rectangular shape is provided so as to cover.

The other transparent substrate 1B located below
A diffusion film 5 for irregularly reflecting light is provided on the upper surface of the substrate, and a transparent insulating film 4B having a flat rectangular shape is provided so as to cover the diffusion film 5 in order to protect the diffusion film 5. .

Each of the transparent insulating films 4A and 4B has a planar top surface 6 and a plurality of inclined side surfaces 7.

[0007] From the top surface 6 of the transparent insulating film 4A to one side surface 7
Are formed, a plurality of segment electrodes 8A, 8A, which are transparent electrodes made of an ITO (indium tin oxide) film, and terminals 9A of each segment electrode 8A are formed on the lower surface of the transparent substrate 1A. . Further, a plurality of common electrodes 8B, 8B, which are transparent electrodes made of an ITO film, are formed from the top surface 6 to one side surface 7 of the transparent insulating film 4B, and a terminal 9B of each common electrode 8B is connected to the transparent electrode. It is formed on the upper surface of the substrate 1B.

A liquid crystal 10 is placed in a sealed space surrounded by the transparent substrates 1A and 1B and the sealing member 2.
Is sealed. Further, in order to keep the distance between the transparent substrates 1A and 1B accurately and constant, the transparent insulating film 4 is used.
A plurality of spherical or columnar spacers (not shown) are interposed between A and 4B.

[0009]

The electrodes 8A and 8B are formed by first forming a transparent conductive film on the electrode formation regions on the transparent substrates 1A and 1B and the transparent insulating films 4A and 4B by sputtering or the like. The transparent conductive film is formed by partially removing the transparent conductive film by a photolithography process.
At this time, the transparent insulating films 4A, 4B
A difference occurs in the resist film thickness on the inclined side surface 7 of
In addition, a difference occurs in the amount of ultraviolet light that reaches the inclined slope 7 during the irradiation of ultraviolet light.

As a result, when a positive resist is used as the resist, as shown in FIG. 8, a bulging portion 11 is formed in the electrode 8 on the inclined side surface 7, and an electrical connection is made between the adjacent electrodes 8,8. Sometimes a short circuit occurred. When a negative resist is used as the resist, FIG.
As shown in FIG.
Was formed, and in some cases, the electrode 8 was disconnected.

An object of the present invention is to provide a liquid crystal display device which overcomes such problems of the conventional device and does not cause an electric short circuit or disconnection on an electrode formed on a transparent insulating film. .

[0012]

In order to achieve the above object, the liquid crystal display element of the present invention according to the first aspect is characterized in that a part of the sealing material for enclosing the liquid crystal which is different in the circumferential direction is any one. Formed so as to face the transparent insulating film of
The point is that a transparent electrode formed on each transparent insulating film and a terminal on each transparent substrate are electrically connected by a transfer material mixed in a sealing material. By employing such a configuration, power can be supplied to the electrode on the transparent insulating film without forming an electrode on the side surface of the transparent insulating film. Can be eliminated.

According to a second aspect of the present invention, there is provided a liquid crystal display element according to the present invention, wherein at least one of the transparent substrates is provided with a plurality of protrusions for maintaining an interval between the transparent substrates by using the same material as the transparent insulating film. It is in the formed point. By adopting such a configuration, the parallelism between the two transparent substrates can be more stably maintained, and the sealing property of the liquid crystal can be further improved.

[0014]

FIG. 1 shows an embodiment of a liquid crystal display device according to the present invention. The same or corresponding components as those of the above-described conventional device are denoted by the same reference numerals in the drawings. The description is omitted.

In FIG. 1, each transparent insulating film 4A, 4B
Each have a planar top surface 6 and a plurality of inclined side surfaces 7.

A plurality of segment electrodes 8A, 8A,..., Which are transparent electrodes made of an ITO film, are formed on the top surface 6 of the transparent insulating film 4A by a photolithography process, and a terminal 9A of each segment electrode 8A is formed. Is the transparent substrate 1B
Is formed on the upper surface of the substrate by a photolithography process. Also,
A plurality of common electrodes 8B, 8B,..., Which are transparent electrodes made of an ITO film, are formed on the top surface 6 of the transparent insulating film 4B by a photolithography process. It is formed on the lower surface of 1A by a photolithography process. Therefore, as shown in detail in FIG. 2, no electrodes are formed on the inclined side surfaces 7 of the transparent insulating films 4A and 4B.

Further, each different part in the circumferential direction of the sealing material 2 enclosing the liquid crystal is formed by any one of the transparent insulating films 4.
A and 4B are formed so as to face each other, and the sealing material 2 at this portion comes into contact with the ends of the electrodes 8A and 8B. Further, a large number of conductive beads 13 as a transfer material are mixed in the sealing material 2 at this portion so as to face each of the electrodes 8A and 8B.
A and 8B are electrically connected to corresponding terminals 9A and 9B. Examples of the conductive beads 13 include resin beads or glass beads having a surface coated with a metal such as Ni or Au, or metal particles.

FIGS. 3 to 6 show the positions of the sealing material 2 on the transparent substrates 1A, 1B due to differences in the number of extending directions of the terminals 9B, 9A in relation to the outer periphery of the transparent insulating films 4A, 4B. It is a thing. In these figures,
The sealing material 2 is formed so as to face one of the transparent insulating films 4A, 4B at a portion where power is supplied to the transparent electrodes 8A, 8B, and from the terminals 9B, 9A on the transparent substrates 1A, 1B. In a portion to which power is supplied, the power supply portion is formed so as to face the transparent substrates 1A and 1B. further,
When the transparent insulating film 4B is formed on the transparent substrate 1B, the transparent insulating film 4A opposing the transparent insulating film 4A using the same material as the transparent insulating film 4B so that the interval between the two transparent substrates 1A and 1B becomes a regular interval.
At least two protrusions 14 having a dimension that abuts on the corners of the transparent insulating film 4B are formed. The projections 14 may be formed on the transparent insulating film 4A, or may be formed on both the transparent insulating films 4A and 4B.

According to the above-described structure, both transparent insulating films 4
The segment electrode 8A and the common electrode 8B formed on A and 4B are respectively connected to the conductive beads 13 in the sealing material 2.
Terminal 9 formed on each transparent substrate 1A, 1B via
B, 9A, the transparent insulating films 4A, 4B which may cause an electrical short-circuit or disconnection of the electrodes.
It is not necessary to form an electrode on the inclined side surface 7. Accordingly, no electrical short-circuit or disconnection of the electrodes occurs, and both electrodes 8A,
8B can be supplied stably.

Further, since the projections 14 formed integrally with the transparent insulating film 4B are formed, the distance between the transparent substrates 1A and 1B can be maintained, and the sealing property of the liquid crystal by the sealing material 2 is improved. It can also be done.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made as necessary.

[0022]

As described above, according to the liquid crystal display device of the present invention, it is possible to eliminate the possibility that the electrodes formed on the transparent insulating film are electrically short-circuited or disconnected.

That is, different portions in the circumferential direction of the sealing material for enclosing the liquid crystal are formed so as to face one of the transparent insulating films, and the transparent electrodes formed on the respective transparent insulating films and the respective transparent substrates are formed. Since the upper terminal is electrically connected to the transfer material mixed in the sealing material, power can be supplied to the electrode on the transparent insulating film without forming an electrode on the side surface of the transparent insulating film. Therefore, it is possible to eliminate the risk of electrical short-circuit or disconnection due to electrode formation.

Further, if a plurality of projections for maintaining the interval between the two transparent substrates are formed of the same material as the transparent insulating film on at least one of the transparent substrates, the parallelism between the two transparent substrates can be further stabilized. The liquid crystal can be retained, and the sealing property of the liquid crystal can be further improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is an enlarged plan view of a main part of FIG. 1;

FIG. 3 is a plan view showing a positional relationship between a sealing material and a transparent insulating film in both transparent substrates in the embodiment of FIG.

FIG. 4 is a plan view showing a positional relationship between a sealing material and a transparent insulating film on both transparent substrates in the embodiment of FIG.

FIG. 5 is a plan view showing a positional relationship between a sealing material and a transparent insulating film on both transparent substrates in the embodiment of FIG. 1 with three terminal directions.

FIG. 6 is a plan view showing a positional relationship between a sealing material and a transparent insulating film on both transparent substrates in the embodiment of FIG. 1 with four terminal directions.

FIG. 7 is a front view showing an example of a conventional liquid crystal display element.

FIG. 8 is a plan view showing an electrical short circuit between electrodes in the liquid crystal display device of FIG. 7;

9 is a plan view showing disconnection of an electrode in the liquid crystal display element of FIG.

[Explanation of symbols]

 Reference Signs List 1A, 1B transparent substrate 2 sealing material 3 color filter 4A, 4B transparent insulating film 6 top surface of transparent insulating film 7 side surface of transparent insulating film 8A segment electrode 8B common electrode 9A, 9B terminal 10 liquid crystal 13 conductive bead 14 protrusion

Claims (2)

[Claims] 1. A liquid crystal display member is disposed on each inner surface of a pair of transparent substrates disposed at an interval by a sealing material, and each liquid crystal display member is covered with a transparent insulating film. A transparent electrode is provided on a transparent insulating film, terminals of the respective transparent electrodes are provided on the respective transparent substrates to connect an external control circuit, and a space surrounded by the sealing material and the two transparent substrates. In a liquid crystal display element having liquid crystal sealed therein, a transparent electrode formed on each of the transparent insulating films, wherein different portions in the circumferential direction of the sealing material are formed so as to face any one of the transparent insulating films. And a terminal on each of the transparent substrates is electrically connected by a transfer material mixed in the sealing material. 2. The transparent substrate according to claim 1, wherein a plurality of protrusions for maintaining an interval between the transparent substrates are formed on at least one of the transparent substrates using the same material as the transparent insulating film. Liquid crystal display element.