JPS6251474B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a display panel, and in particular to a structure of an electrode terminal portion connecting a drive circuit in a flat display panel such as an electroluminescence (EL) display panel. It is related to.

(2) Prior art and problems As is well known, an EL display panel is made by using a dielectric layer on a glass substrate on which, for example, linear electrodes are arranged in parallel.
It has a structure in which an EL layer is formed, and a linear back electrode made of Al or the like is arranged on the EL layer with a dielectric layer interposed therebetween in a relationship perpendicular to the transparent electrode. A display pixel is defined at each intersection of the transparent electrode and the back electrode, that is, the display electrode.

By the way, in order to connect such display electrodes to a drive circuit, it is necessary to bring out the terminals of the display electrodes close to each other from the display area on the peripheral edge of the glass substrate, and connect the drive circuit to these electrode terminals. It's getting old.

Conventionally, methods for connecting a drive circuit to such an electrode terminal include a method of aligning and press-fitting a connection line from the electrode terminal and the drive circuit, such as a flat cable, or a method of soldering using infrared rays. However, the former is unreliable because the connection points are susceptible to mechanical vibration, and furthermore, it is extremely difficult to connect with high-resolution display panels. The latter also had the problem of being a large-scale device and lacking in versatility.

(3) Purpose of the Invention The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a display panel having a structure that allows easy soldering of the electrode terminal portion and the connection line of the drive circuit. .

(4) Structure of the Invention In a display panel in which terminal portions of a plurality of display electrodes are led out in close proximity to a peripheral portion of an insulating substrate constituting the display panel, a solder layer is formed on the upper surface of the electrode terminal portions. , and a resistive heating film is disposed on the lower side of the electrode terminal portion corresponding to the solder layer forming portion via an insulating layer, and the solder layer of the electrode terminal portion is heated by the resistive heating film to perform soldering. This is achieved by providing a display panel characterized by the following.

(5) Embodiments of the invention Examples of the invention will be described below with reference to the drawings.

FIG. 1 is a conceptual top view of essential parts for explaining the structure of an EL display panel according to the present invention, and FIG. 2 is a sectional view taken along line AA' in FIG.

In both figures, reference numeral 1 denotes a glass substrate constituting an EL display panel, and a terminal portion 2 of a display electrode, for example, a back electrode, is proximately led out from the periphery of the glass substrate 1. Each electrode terminal portion 2 is, for example,
It consists of an Al layer 2a, a deposited Ni layer 2b, and a plated solder layer 2C. Further, a resistance heating film 4 made of indium tin oxide (ITO) is disposed below each electrode terminal portion 2 via an insulating layer 3 of Al ₂ O ₃ , for example. And by the resistance heating film 4,
Each electrode terminal portion 2 to be connected to an external circuit disposed thereon via an insulating layer 3 is heated. Note that the thickness of the insulating layer 3 is desirably formed to be approximately several μm in consideration of reducing capacitance coupling between the electrode terminal portions 2 and heat conduction.

FIG. 3 is a conceptual diagram of main parts for explaining a method of connecting a drive circuit to an EL display panel according to the present invention, and parts equivalent to those in FIG. 2 are given the same reference numerals. In the figure, 5 is a printed circuit board, for example.
A connection line 6 from the drive circuit side is provided on the surface of the printed circuit board. Further, each of the connection lines 6 is made of, for example, a Cu layer, and the surface thereof is soldered in advance.

Now, when connecting the connection wires 6 of the printed circuit board 5 to the electrode terminal parts 2, each electrode terminal part 2 and each connection wire 6 corresponding to those electrode terminal parts 2 are aligned and pressed together. , a power source 7 is connected to the resistance heating film 4 to supply power. As a result, the resistance heating film generates heat, and each electrode end portion with only the insulating layer 3 interposed therebetween is heated in a short time, and the solder is melted, so that each electrode end portion 2 and each connection wire 6 are soldered. .
Note that the connection line 6 from the drive circuit side is not limited to the one disposed on the surface of the printed circuit board 5, but a flat cable or the like can be similarly connected.

In this way, the connection by soldering between the electrode terminal portion 2 of the EL display panel and the connection line 6 of the drive circuit can be carried out extremely reliably and easily.

In the above-mentioned embodiments, the present invention is applied to an EL display panel, but the present invention is not limited to this and can be applied to other flat display panels having electrode terminals such as gas discharge display panels and liquid crystal display panels. A similar effect can be obtained.

(6) Effects of the Invention As is clear from the above description, according to the present invention, a high-resolution display panel and a drive circuit can be easily and reliably connected without using a large-scale device such as an infrared heating device. As a result, a highly reliable connection can be realized at low cost, and its practical effects are great.

[Brief explanation of the drawing]

Fig. 1 is a conceptual top view of the main parts for explaining the structure of the EL display panel according to the present invention;
The figure is a sectional view taken along the line AA' in FIG. 1, and FIG. 3 is a conceptual diagram of main parts for explaining a method of connecting a drive circuit to an EL display panel according to the present invention. 1: Glass substrate constituting the EL display panel,
2: electrode terminal portion, 3: insulating layer, 4: resistance heating film,
5: Printed circuit board, 6: Connection wire, 7: Power supply.

Claims (1)

[Claims] 1. In a display panel in which terminal portions of a plurality of display electrodes are drawn out in close proximity to a peripheral portion of an insulating substrate constituting the display panel, a solder layer is formed on the upper surface of the electrode terminal portion, and the solder layer A resistance heating film is disposed below the electrode terminal portion corresponding to the forming portion via an insulating layer, and the solder layer of the electrode terminal portion is heated by the resistance heating film to perform soldering. Features a display panel.