JPH0220797Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electroluminescent display panel provided with sealing means for sealing electroluminescent elements formed on a substrate.

[Technical background of the invention and its problems]

Electroluminescent element (hereinafter referred to as "EL")
One of the major causes of characteristic deterioration of the materials (referred to as "synthetic materials") is the intrusion of moisture. Therefore, in order to prevent atmospheric moisture from entering the EL formed on a glass substrate or the like, the EL is sealed.

This conventional EL sealing structure is shown in FIG.

In the figure, 1 is a glass substrate, 2 is a transparent lower electrode (hereinafter referred to as "ITO") patterned on the glass substrate 1, 3 is a light emitting layer, 4 is an upper electrode, and 5 is an ITO2
or an external connection electrode formed on the upper electrode 4;
7 is a sealing member manufactured by digging the EL housing part 7a so as to seal the EL element.

As shown in the figure, an EL consisting of an ITO 2, a light emitting layer 3, and an upper electrode 4 was formed on a glass substrate 1, a sealing member 7 was adhered to this, and the EL was sealed in an EL housing 7a.

In other cases, a spacer is manufactured by resin molding or the like, and this spacer is adhered onto the external connection electrode, and a sealing plate is further adhered thereon for sealing.

For this reason, even if the sealing member 7 is manufactured by digging or a spacer is manufactured, a great deal of effort is required for processing and the manufacturing cost is high.

[Purpose of invention]

This idea was created in view of the problems mentioned above.
An object of the present invention is to provide an electroluminescent display panel that can inexpensively and reliably seal an electroluminescent element and effectively prevent moisture from entering.

[Structure of the idea]

The above objects of the present invention are achieved, for example, by the following configuration.

That is, an electroluminescent element consisting of a lower electrode, a light emitting layer, and an upper electrode is produced on a substrate,
A connecting electrode portion of the electrode in the peripheral area of the electroluminescent element is formed to have a thickness greater than the thickness of the electroluminescent element, the portion of the electrode is used as a spacer, and a substantially flat plate is placed on the spacer. This is achieved by an electroluminescent display panel in which an electroluminescent element is sealed by bonding a sealing plate.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing the configuration of the present invention, and the same components as in FIG. 3 are given the same numbers, and the explanation of these parts will be omitted.

As shown in the figure, a hard substrate 1 is used as the substrate, but in many cases a glass substrate is used to extract light from the substrate side.

A DC with a light-emitting layer sandwiched between electrodes on this substrate 1
A type EL element, an AC type EL element having a light emitting layer and a dielectric layer sandwiched between electrodes, etc. are formed.

Then, connect the external connection electrode 5 to the EL
The spacer is formed to have a thickness greater than or equal to . Also, 6
is a sealing plate, and the sealing plate 6 has a flat plate structure having a substantially uniform thickness.

In this example, ITO2 is approximately 0.2μ, and light emitting layer 3 is approximately
The thickness of the upper electrode 4 is approximately 0.5μ, and the thickness of the EL is approximately
It is 1.2μ. In addition, the external connection electrode 5 is 2μ
It is molded to a thickness of .

FIG. 2 is a plan view of the plane A-A in FIG. 1 viewed from above.

As shown in the figure, by forming a matrix with the ITO 2 and the upper electrode 4 and applying a voltage to specific electrodes, the light-emitting layer at a desired matrix intersection point can be caused to emit light.

To seal the EL, first seal the outer periphery of the EL element.
Apply adhesive to a certain thickness on the shaded area shown in
The sealing plate 6 is placed on top of this. At this time, the sealing plate 6
is positioned at a desired distance from the upper surface of the EL element (in this embodiment, about 1 μ between the upper electrode 4 and the sealing plate 6) by the function of the external connection electrode 5 as a spacer.

Also, at this time, adhesive is filled between the glass substrate 1 and the sealing plate 6 except for the external connection electrode 5 portion, and when the adhesion is completed, the adhesive hardens and the external connection electrode 5 The EL element is sealed while being positioned at a thickness of .

[Effect of idea]

As explained above, according to the present invention, complicated processing steps such as digging are not required to prevent moisture from entering the electroluminescent element.
The device can be easily sealed by simply increasing the thickness of the external connection electrode to double as a spacer and gluing a flat sealing plate on top of it, and does not require complicated processing. An electroluminescent display panel can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention;
The drawings are a plan view taken from the top of the plane A-A in FIG. 1, and FIG. 3 is a sectional view of a conventional electroluminescent display panel. In the figure, 1...Glass substrate, 2...Transparent electrode, 3
...Light emitting layer, 4... Upper electrode, 5... External connection electrode, 6... Sealing plate, 7... Sealing member.

Claims (1)

[Claims for Utility Model Registration] (1) An electroluminescent display panel comprising a sealing means for sealing an electroluminescent element consisting of a lower electrode, a light emitting layer, and an upper electrode on a substrate, The sealing means forms at least a non-emissive layer part of the electrode of the electroluminescent element to have a thickness greater than the thickness of the electroluminescent element, uses the part of the electrode as a spacer, and a substantially flat plate is formed on the spacer. An electroluminescent display panel characterized by being formed by adhering a sealing plate of a shape. (2) The electroluminescent display panel according to item 1 of the utility model registration claim, characterized in that the external connection electrodes formed on the outer periphery of the substrate are thickened and used as spacers.