JPH02181119A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To decrease the number of connecting members to a driving circuit board and to reduce the thickness of a module by providing a resin layer contg. conductive particles on the outer side of a sealing part to obtain the conduction of the electrodes of upper and lower substrates and leading out the terminal parts of both common and segment electrodes to the same substrate. CONSTITUTION:An ITO film is formed on a common substrate 1 consisting of a polymer film and the common electrodes 2 and common electrode terminal parts 3 are provided. The segment electrode terminal parts 4 are provided as well. The ITO film is similarly formed on the segment substrate 5 consisting of the polymer film and the segment electrodes 6 are so provided as to intersect orthogonally with the common electrodes 2. An anisotropic conductive film is used as the resin (conductive part 9) contg. the conductive particles 9' and after the conductive film is tentatively press-welded onto the lower substrate 1, an epoxy sealant of a thermosetting type is printed, then the upper and lower substrates 1, 5 are stuck to each other. The conductive film crimping part is thereafter heated and pressurized to obtain the conduction of the upper and lower substrates 1 and 5, i.e., the conduction of the segment electrodes 6 (upper substrate 5) the conductive part 9 the segment electrode terminal parts 4 (lower substrate 1). The smaller connecting members to the driving circuit substrate are necessitated in this way and the thickness of the module is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display element, and more particularly to the structure of an electrode terminal portion of a liquid crystal display element.

[Conventional technology]

The adjustment circuit J1 (electrode terminal portions for connection with the plate in the conventional liquid crystal display element) are formed so that one faces upward and the other faces downward, as shown at 10 and 11 in FIG. FIG. 3 shows an example of a connection form between a liquid crystal display element having such an electrode terminal portion and a drive circuit board.

In FIG. 3, 12 is a segment substrate of a liquid crystal display element;
13 is a common board, 14 is a drive circuit board, 15.16 is a gold electrode, 17 is a zebra connector or an anisotropic conductive film, 18
is a film connector or FPC. As shown in the figure, the electrode terminal portion 10 of the segment substrate 12 (FIG. 3)
is connected to the gold electrode 15 on the drive circuit board 14 by a zebra connector or an anisotropic conductive film 17, and the electrode terminal portion 11 (FIG. 2) of the common board 13 is connected to a film connector or F
It is connected to the gold electrode 16 on the drive circuit board 14 by the PC 18. In this connection form, the connection method is different between the common side and the segment side, and especially on the common side, the active circuit board 1
A direct score against 4 is impossible.

A fourth example shows another connection form between the liquid crystal display element and the drive circuit board.
As shown in the figure. In FIG. 4, 21 is a segment] board, 22 is a common board, 23 and 24 are drive circuit boards,
25 and 26 are LSIs. In this example, segment 1
to the electrode terminal portion 10 (FIG. 2) of the substrate 21, the electrode terminal portion 11 (FIG. 2) of the common substrate 22, and the quick-acting circuit board 23.
Although direct connection with 24 is possible, there is a drawback that the thickness of the module is increased by one LSI.

As a way to solve these problems, segments,
Connect the electrode terminals of both common boards to the swing circuit board.
A possible method is to perform this on one of the upper and lower substrates constituting the liquid crystal display element.

For this purpose, it is necessary to establish electrical continuity from the electrode on one substrate to the other substrate.
In the method described in Japanese Patent No. 813, such conduction is achieved by dispersing conductive heavy particles in the sealant. This method creates continuity by dispersing conductive particles with a diameter that is almost the same as the thickness of the liquid crystal layer in the sealant, so the thickness of the liquid crystal cell becomes uniform, and the area and spacing of the conductive parts need to be particularly large. It has advantages such as no

[Problem to be solved by the invention]

However, the method described in the publication had the following problems.

That is, when using this method, in order to make the I'J of the liquid crystal cell uniform, the diameter of the conductive particles must be made the same as the thickness of the liquid crystal layer. However, if the thickness of the liquid crystal H'l is strictly defined due to the characteristics and functions of the liquid 1'I7 display element, conductive particles with a correspondingly high particle size accuracy are required, resulting in a high cost of 1. There was a problem.

The present invention has been made in view of the above circumstances, and allows the common and safety member 1 inner electrode terminals to be led out on the same board, reducing the number of connecting members to the excitation circuit board, and making it easier for the module. Low cost 1 liquid crystal display element that can be made thinner
- The purpose is to provide.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, a pair of polymer film transparent substrates having transparent electrodes on one side are separated so that the transparent electrode surfaces face each other, and a portion slightly inside the outer periphery between the disturbance plates is arranged. In a liquid crystal display element whose surroundings are sealed with a sealing agent and a liquid crystal is sealed inside, a resin layer containing conductive particles is provided on the outside of the seal, and the resin layer connects both transparent electrodes. Provided is a liquid crystal display element characterized in that both electrode terminals are led out onto one of the substrates.

[For production]

By using a polymer film for the substrate and providing a resin layer containing conductive particles on the outside of the seal, conduction can be established from one substrate to the other regardless of the thickness of the liquid crystal layer. , common, and segment electrode terminals can be provided on the same substrate, and the above-mentioned problem is solved.

〔Example〕

Hereinafter, the present invention will be explained in detail by way of examples with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the liquid crystal display element of this example, where (a) is a plan view showing only the lower substrate side of the liquid crystal display element, and (b) is a diagram showing the characteristics of the liquid crystal display element. FIG.

First, an ITO film was formed by sputtering on a common substrate 1 made of a polymer film with a thickness of 100 tones, and a common electrode 2 and a common electrode terminal portion 3 continuous thereto were provided, as well as a segment electrode terminal portion 4. At this time, the arrangement directions of the common electrode 2, the common electrode terminal portion 3, and the segment electrode terminal portion 4 were arranged at right angles. Similarly, a TIO film was formed on a segment substrate 5'' made of a polymer film with a thickness of 1100p by sputtering, and a segment electrode 6 was provided so as to be orthogonal to the common electrode 2. Next, a commercially available anisotropic conductive film is used as the resin containing conductive particles 9' (conductive part 9), and after the conductive film is temporarily pressed onto the lower substrate 1'', a thermosetting epoxy sealant is applied. The upper and lower substrates 1 and 5 are printed, and the upper and lower substrates 1 and 5 are bonded together, and then the conductive film sandwiching part is heated and pressurized to make the upper and lower substrates 1 and 5 conductive, that is, segment electrode 6 (upper substrate 5) → conductive part 9 → segment electrode terminal part 4 (lower substrate 1). Liquid crystal was injected into the liquid crystal cell prepared as described above by a conventional method to form liquid crystal N8, and a liquid crystal display element was obtained.

In this embodiment, the thickness of the liquid crystal layer 8 is approximately 8 μm1.
The diameter of one particle 9' in the 7th field was about 7 μm, but after heating and pressurizing the conductive part r], the diameter of the electrocardiographic particle 9' became liquid crystal JT! There was no effect on the liquid crystal display characteristics due to the difference between JI- and 'J of J8. Also, the thickness of J8 and the diameter of the conductive particles ε]' used were significantly different. In this case, the distance between the sealing part 7 and the resin layer (conductive part 1) containing the conductive particles 9' is maintained to a certain extent. By doing so, it is possible to prevent cracks from occurring in the electrode terminal portion due to bending of the base +1).

Note In the example, a commercially available anisotropic conductive film was used as the 4Nd resin layer, but if it is placed in a can, after forming the liquid crystal cell, a low viscosity resin with recyclable particles dispersed in it can be used with a dispenser etc. 1. After injecting into the hand-conducting part, compression bonding, heat compression bonding, etc. may be performed.

〔Effect of the invention〕

As described in detail below, according to the present invention, the resin containing mercury particles is installed on the outside of the sealing part.
By I locator, -1・1・,',l; +Iy(1)
Since the conductor of the electrodes is aligned and the terminals of the common and semi-electrode 1 to both electrodes are raised on the same board, the number of connecting parts to the drive circuit board can be reduced, making it possible to make the module thinner, and further improving the conductivity. Since it is no longer necessary that the diameter of the particles be the same as the thickness of the liquid crystal layer, the cost will be reduced in terms of yield.
can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a liquid crystal display element according to an embodiment of the present invention. FIG. 1(a) is a diagram showing only the lower substrate side, and FIG. 1(b) is a cross-sectional view showing characteristic parts. 2 is a perspective view showing the installation state of the electrode terminal portion of a conventional liquid crystal display element, and FIGS. 3 and 4 are perspective views showing the connection form of the conventional liquid crystal display element and a driving circuit board, respectively. Common board 2/Common electrode

Claims (1)

[Claims] (1) A pair of polymer film transparent substrates with transparent electrodes on one surface are placed apart so that the transparent electrode surfaces face each other, and the periphery slightly inside the outer periphery between both substrates is sealed with a sealing part, and a liquid crystal display is placed inside. In the liquid crystal display element, a resin layer containing conductive particles is provided on the outside of the sealing part, and the electrode terminals of both transparent electrodes are guided onto one of the substrates by the resin layer. Characteristic liquid crystal display element.