JPS6159429A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent securely an electrode terminal provided to an end side of a liquid crystal display element substrate from being fused by providing a film which cuts off the incidence of external light on photosetting resin. CONSTITUTION:An upper substrate 1 and a lower substrate 2 to which an upper electrode 3 and a lower electrode 4 are adhered are sealed with a sealing material 5 to constitute an envelope 6, and liquid crystal 7 is charged in the is envelope 6 to constitute the liquid-crystal display element 8. The electrode terminal 9 formed at one end side of the lower substrate 2 is clamped with the contact piece 10a of a pin lead 10 and connected electrically with a conductive adhesive 11. Further, UV setting type resin 12 is applied to the periphery of the connection part and set, and a black film 13 is formed thereupon.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a liquid crystal display device, and particularly relates to a method for connecting electrode terminals provided at the ends of a liquid crystal display element and pin leads electrically connected to an external circuit. It is related to the connection structure.

[Background of the invention]

A liquid crystal display device that is installed in an industrial or measuring instrument to display required information in a pattern consists of a liquid crystal display element that displays the pattern and a drive circuit board that operates this liquid crystal display element. Electrical connection between the two has been made by soldering pin leads provided at the ends of the electrode substrate of the liquid crystal display element to the circuit board. Further, a method for connecting and fixing pin leads to the ends of the electrode substrate of a liquid crystal display element is described in Japanese Patent Publication No. 11088/1988. Furthermore, in recent years, photocurable resins have been
Since curing progresses only by irradiation with TRV light, it has excellent workability and can streamline the process, so it is widely used as a fixing resin for pin leads instead of thermosetting resins such as epoxy resins. (Japanese Unexamined Patent Publication No. 58-29127).

However, in such a connection and fixing method, flux is used to perform solder welding when connecting the pin lead and the circuit board. Usually, the flux is cleaned using a chlorinated solvent such as chlorocene (1,1,1) dichloroethane). Compared to thermosetting resins such as epoxy resins, UV curable resins swell with solvents more easily and easily contain chlorinated solvents when cleaning solder flux.

The chlorine-based solvent contained in the resin decomposes and generates chlorine when exposed to light, for example when the liquid crystal display element is used outdoors. This chlorine absorbs moisture from the air and
It becomes HCt (hydrogen chloride) form. Also, HCl with is
The transparent electrodes that form the terminals of the liquid crystal display element are easily dissolved, resulting in disconnection. The transparent electrode is generally formed of a mixture of tin oxide and indium oxide,
It has a film thickness of 200 to 100 OA. Furthermore, indium oxide, which is a compositional material, combines with Ct to form indium chloride.

Furthermore, the mechanism of this phenomenon is also clear from the fact that hydrochloric acid is also used when etching the electrode pattern of a liquid crystal display element.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to reliably prevent the electrode terminals provided on the edges of the liquid crystal display element substrate from melting, thereby improving quality and reliability. The objective is to provide an excellent liquid crystal display device.

[Summary of the invention]

In order to achieve this object, the present invention provides a colored coating film that blocks external light on the resin material 4 that fixes the edge of the substrate of the liquid crystal display element and the pin leads.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

The figure shows a cross section 1 of a main part showing an example of a liquid crystal display device according to the present invention.
FIG. In the figure, an upper electrode 3 and a lower electrode 4 each made of a transparent conductive film are formed on the opposing surfaces of an upper substrate 1 and a lower substrate 20 made of transparent glass plates, respectively.
The upper substrate 1 and the lower substrate 2 are separated from each other by a predetermined distance and their peripheral parts are sealed with a sealing material 5 to form an envelope 6, and a liquid crystal T is sealed in the envelope 6. A liquid crystal display element 8 is constructed. Further, on one end side of the lower substrate 2 constituting the liquid crystal display element 8, one end side of the lower electrode 4 is extended, and an electrode terminal 9 is formed.

A pin lead 10 is arranged so that the electrode terminal 9 is sandwiched between contact pieces 10a of a pin lead 10 made of, for example, a phosphor bronze plate, and is electrically connected with a conductive adhesive 11. Further, an IT1r curable resin 12 is applied around the connection portion and cured by irradiation with ultraviolet rays from a mercury lamp or the like, so that the pin lead 10 is firmly fixed to one end side of the lower substrate 2.

In addition, a fluororubber paint such as Perflon Paint (trade name) manufactured by Kinyosha H is applied to the entire outer peripheral surface of the UV hardening phase resin 12 and dried to form a black film 13.

According to such a configuration, by providing the black film 13 on the outer peripheral surface of the UV hardening phase resin 12, it is possible to block the incidence of light from the inside and outside of the UV hardening phase resin 12. It is possible to prevent the decomposition of the halogen-based solvent and prevent the electrode terminal 9 from dissolving.

In addition, in the above-mentioned example, a case was explained in which a fluororubber paint was used as the black coating and pattern 13, but the present invention is not limited to this. , and if the film is capable of blocking external light, exactly the same effect as described above can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reliably prevent the electrode terminals provided on the edges of the liquid crystal display substrate from melting, so that a liquid crystal display device with high quality and reliability can be obtained, which is an extremely excellent effect. has.

[Brief explanation of drawings]

The figure is a sectional view of essential parts showing an example of a liquid crystal display device according to the present invention 1c.

Claims (1)

[Claims] A liquid crystal display device in which a pin lead is connected to an electrode terminal formed on an edge of a substrate of a liquid crystal display element, and a photocurable resin is applied to this connection portion to fix the pin lead to an edge of the substrate. A liquid crystal display device characterized in that a coating is provided on a resin to block the incidence of external light.