JP3084798B2 - Liquid crystal display - Google Patents

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 in the fields of vehicle mounting, measuring and consumer use, home electric appliances and the like.

[0002]

2. Description of the Related Art A conventional liquid crystal display device with a connect pin is:
On the electrode terminals outside the spacer between the opposing glass substrates, the surroundings of the electrode terminals contacting the connect pins are covered with a molding agent. However, the molding agent is not filled between the opposing glass substrates, and voids are generated. Also, JP
In FIG. 1 of JP-A-241526, a narrow portion 9a is formed in a sealing material 9 in order to enlarge an effective display area of a liquid crystal display element, and an adhesive 12 is formed in order to reinforce the narrow portion 9a.
A liquid crystal display element in which is filled between glass substrates is shown.

[0003]

However, in the above-mentioned prior art, there is a gap in which the molding agent is not filled in the spacer external electrode terminals between the opposing glass substrates. Therefore, an environmental test of 80 ° C.-90% RH, -30 ° C.
水分 At 80 ℃ and -40 ℃, moisture intrusion and moisture condensation occur.
Further, by energizing the liquid crystal display device, contact (corrosion) of the electrode pattern existing in the gap is induced. Due to the above, there is a problem that the electrode pattern is lost.

In the liquid crystal display element disclosed in Japanese Patent Application Laid-Open No. 1-241526, a narrow portion 9a is formed. There is a problem that electrode pattern corrosion occurs as described above depending on the material properties of the agent 12.

The present invention solves these problems, and an object of the present invention is to provide a liquid crystal display device in which corrosion is not induced in an electrode pattern existing in a gap.

[0006]

A liquid crystal display device according to the present invention has a pair of substrates opposed to each other with a spacer interposed therebetween, and an electrode pattern is formed on one of the pair of substrates outside the spacer. Is formed, the electrode pattern is directly covered with a molding agent having a water absorption of 0.1 to 5%, and the electrode pattern is provided between the other substrate of the pair of substrates and the electrode pattern. The voids formed are filled with the molding agent. Also, a connect pin may be in contact with the electrode pattern. The liquid crystal display device of the present invention has a pair of substrates opposed to each other with a spacer interposed therebetween, and an electrode terminal portion in which a plurality of electrode patterns are formed outside the spacer on one of the pair of substrates. Wherein each of the electrode patterns is in contact with a connecting pin, and the plurality of electrode patterns and the connecting pin are directly covered with a molding agent having a water absorption of 0.1 to 5%. In the electrode terminal portion, a gap formed between the pair of substrates is filled with the molding agent. In the above-described liquid crystal display device of the present invention, it is preferable that the molding agent includes a component selected from the group consisting of a methacrylate-based, an acrylic-based, and a silicon-based.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

[Embodiment 1] FIG. 1 is a sectional view of a liquid crystal display device according to the present embodiment, which will be described with reference to FIG.
As for the structure, an upper glass substrate 1 and a lower glass substrate 2 are held in parallel by a spacer 3, and a liquid crystal 4 used for a TN type or STN type is sandwiched between the upper glass substrate 1 and the lower glass substrate 2. ing. On a glass substrate of opposite surface side of the transparent electrode pattern 5 on each glass substrate be formed a transparent electrode pattern 5 such as ITO and S _n O _2, the upper polarizing plate 6, attached the lower polarizing plate 7 Have been.
A thread chamfer 9 is provided at the tip of the electrode terminal 8 of the lower glass substrate 2.
(Or R chamfering) is applied, a conductive paste 10 such as carbon, silver, copper paste or the like is applied on the transparent electrode pattern 5 on the electrode terminal 8, and a connect pin 11 such as a cylinder is applied to the electrode terminal. Contact using propulsion. Thereafter, an upper molding agent 12 and a lower molding agent 13 are applied and fixed so as to cover the connect pins 11.

According to this embodiment, the upper molding agent 12 is made to penetrate into the space 3 outside the spacer 3 of the transparent electrode pattern 5 between the opposing glass substrates (the electrode terminals 8), and the space 14 between the opposing glass substrates is formed. Is characterized by filling the upper molding agent 12 so as not to leave bubbles and the like.

According to the preceding paragraph, a durability test such as a moisture resistance test (40 ° C., 60 ° C., 80 ° C.-90% R)
H), no corrosion at the time of current application in an environment such as a thermal shock test (−40 ° C.∞80 ° C.).

The viscosity of the liquid used for the upper molding agent 12 is optimally in the range of 4000 CP to 20000 CP, and the distance between the upper and lower glass substrates (cell gap) is 5 CP.
When the thickness is up to 12 μm, the upper molding agent 12 can be filled up to the spacers 3 in the voids by the occurrence of the capillary phenomenon.

However, the above filling depth depth is 2.0 mm
Is obtained from the experimental results.

[Embodiment 2] FIG. 2 is a schematic view of a liquid crystal display device according to the present embodiment, in which an upper molding agent 12 is applied over the entire area on an electrode terminal 8 using the same molding agent as in Embodiment 1. Apply. As a result, the upper molding agent 12 penetrates into the space 14, and the electrode terminals 8
By covering all of the upper gaps, the occurrence of corrosion of the electrode pattern in the gaps 14 can be prevented.

The application and fixation of the lower molding agent 13 can be arbitrarily determined, and do not affect the above contents.

[Embodiment 3] In this embodiment, in the liquid crystal display device of the embodiment 1 or 2, the component of the molding agent is methacrylic acid.
A resin which is a UV-curable resin of an acrylic type or a silicon type and has a low absorptivity of 0.1 to 5.0% with respect to an absorptivity of water most involved in corrosion.

Table 1 shows the rate of occurrence of corrosion with respect to the water absorption when a methacrylate ultraviolet curable resin is used.

[0017]

[Table 1]

As apparent from Table 1, the water absorption is 5.0%.
It can be seen that in the case of the resin exceeding the above, there is an increasing tendency in the defect occurrence rate.

[Embodiment 4] FIG. 3 is a schematic view of a liquid crystal display device according to the present embodiment.
In the apparatus described above, by treating the side molding agent 15 with a resin having the same characteristics as that of the upper molding agent so as to cover the voids, the corrosion can be further enhanced.

[0020]

According to the present invention, the electrode pattern has a water absorption of 0.1.
The molding agent is directly coated with about 5% of the molding agent, and the molding agent is filled in a gap formed between the other substrate of the pair of substrates and the electrode pattern or a gap formed between the pair of substrates. This can prevent corrosion occurring in the electrode pattern outside the spacer due to moisture intrusion or moisture condensation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a schematic view of a liquid crystal display device of the present invention.

FIG. 3 is a schematic diagram of a liquid crystal display device of the present invention.

[Explanation of symbols]

 1. Upper glass substrate 2. Lower glass substrate 3. Spacer 4. Liquid crystal 5. Electrode pattern 6. Upper polarizing plate 7. Lower polarizer 8. Electrode terminal 9. Yarn chamfering 10. Conductive paste 11. Connect pin 12. 12. Upper molding agent 13. Lower molding agent Void 15. Side molding agent

Claims (4)

(57) [Claims] 1. A liquid crystal display device comprising: a pair of substrates opposed to each other via a spacer, wherein an electrode pattern is formed on one of the pair of substrates outside the spacer. The pattern is directly covered with a molding agent having a water absorption of 0.1 to 5%, and a void formed between the other substrate of the pair of substrates and the electrode pattern is filled with the molding agent. A liquid crystal display device comprising: 2. The liquid crystal display device according to claim 1, wherein a connect pin is in contact with said electrode pattern. 3. A liquid crystal having a pair of substrates opposed to each other with a spacer interposed therebetween, and having an electrode terminal portion in which a plurality of electrode patterns are formed outside the spacer on one of the pair of substrates. In the display device, each of the electrode patterns is in contact with a connecting pin, and the plurality of electrode patterns and the connecting pin are directly covered with a molding agent having a water absorption of 0.1 to 5%. A liquid crystal display device, wherein the molding agent is filled in a gap formed between the pair of substrates in the terminal portion. 4. The liquid crystal display device according to claim 1, wherein the molding agent contains a component selected from the group consisting of methacrylate, acrylic, and silicon.