JPH02293713A - Method for sealing thin-film el panel with protective liquid - Google Patents

Abstract

PURPOSE:To provide a sure sealing against the permeation of moisture and to prevent the deterioration in the element characteristics of the thin-film EL panel by sealing the infiltrating liquid injecting hole provided on a rear glass plate with a glass cap by using an adhesive agent having a small coefft. of moisture permeation and a quick setting adhesive agent. CONSTITUTION:The infiltrating liquid is injected into a gap 4 from the infiltrating liquid injecting hole 5 provided on the rear glass surface 3 of the thin-film EL panel formed by holding the EL element 7 in the gap 4 enclosed with a transparent electrode 2 on a glass substrate 1 and the rear glass plate 3. A spot facing hole 6 is formed on the outside surface of the injecting hole 5. The injected liquid is sealed in the spot facing hole 6 by covering the outside end part of the residual piece 8'' of an injecting pipe 8 by the adhesive agent 9 consisting of an epoxy resin or photo-curing resin, etc. The glass cap 11 is thereafter fixed by using the adhesive agent 12 for tentative adhering and the adhesive agent 10 for regular adhering of different kinds. The adhesive agent 1 for tentative adhering is the resin adhesive agent having a quick setting property and the glass cap 22 is fixed in an early period before the resin adhesive agent having the small coefft. of moisture permeation sets. The sure sealing operation is thus possible.

Description

[Detailed description of the invention] Industrial application field> The present invention is directed to a thin film E using an AC electric field type LiEL element.
This invention relates to a protective liquid sealing method for an L panel.

<Prior art> Conventional AC electric field type thin film EL panels are as shown in Figures 5 and 6.
It is configured as shown in the figure.

That is, the thin film EL panel shown in FIG.
20. , Ti○2, Af20:nSi*N. ,Si02
A first dielectric layer 13 selected from the above is formed by sputtering or electron beam evaporation, and ZnS:Mn sintered pellets are formed on the upper surface of the fjSi dielectric layer 13 by electron beam evaporation. ZnS formed
A second dielectric layer 15 made of the same material as the first dielectric layer 13 is formed so as to cover the light emission Wi 14. And the 12th
A large number of parallel strip-shaped back electrodes 16 made of A1 are deposited on the dielectric WJ15 in a direction intersecting the transparent electrode 2, and an AC power source 7 is connected between both electrodes 2 and 16 to drive the electrodes. I try to do that. And, “2nd Thin Film El.
The panel is widely used as a flat thin display device that takes advantage of the Space 7 Actor to display characters, symbols, various images, etc. However, in this case, the first and second dielectrics 113. Luminescent layer 14 by 15
The light-emitting layer 1
Moisture easily enters the inside of the device, which causes heat generation, peeling between the eyebrows, and other deterioration of device characteristics due to loss of EL light emission.

Therefore, there is a method shown in FIG. 6 as a means to deal with the defect described in "2".

That is, in FIG. 6, a large number of parallel band-shaped transparent electrodes 2 are formed on a glass substrate 1''2, and a first layer is formed on the transparent electrodes 2.
dielectric layer 13, ZnS light emitting layer 14, Si3N. The film and a second dielectric layer 15 made of A1203 film are sequentially laminated, and on the dielectric layer 15, a large number of parallel strip-shaped back electrodes 16 are provided in a direction crossing the transparent electrode 2. ing.

Then, on the transparent electrode 2, a first dielectric layer 13,
Light emission [14] A spacer 18 is provided surrounding the second dielectric material i15 and the back electrode 16, and a back glass plate 3a is attached thereon with an adhesive 19. By attaching the transparent electrode 2
A gap 4a is formed by the spacer 18 and the back glass plate 3a, and a hole 1 bored in the back glass plate 3a is formed in the gap 4a.
The purpose is to reduce the occurrence of defective products when fluid (wetting liquid) such as silicone oil or grease is filled through one or more injection holes 5, and to provide products with stable performance.

<Means for Solving the Problems> In an injection hole portion that guides the infiltrating liquid into a gap surrounded by a transparent electrode on a glass substrate and a back glass plate, An adhesive with a small moisture permeability coefficient and a fast-curing vA adhesive are placed in the gap between the glass cap and the glass cap, starting from the injection hole, to adhere the glass cap.

Effect〉 The glass cap is attached to the infiltrating liquid injection hole provided on the rear glass plate using an adhesive with a small moisture permeability coefficient and a fast-curing adhesive. After that, the adhesive with a low moisture permeability coefficient hardens and acts to prevent moisture from entering.

<Example> Hereinafter, the present invention will be described in detail with reference to an example shown in FIG. By pasting a flat glass cap 11 through the hole 9, the injection hole is sealed 11--to solve problems caused by pinholes and micro-cracks in the injection fluid.

<Problem to be solved by the invention> However, when enclosing the injection hole with a flat glass cap,
When adhesive 9 made of ultraviolet curing resin is used, workability is good, but the moisture permeability coefficient is 0 (Wiv. EL, easy to penetrate into layers, reducing reliability.

In addition, when the adhesive 9 is made of epoxy resin, the moisture permeability coefficient is small and the reliability is high, but the viscosity decreases rapidly during the curing reaction and the fluidity increases, so that the working conditions of the EL panel may be tilted even slightly. If this is done, the flat glass cap will shift and cause poor positioning, so in order to eliminate such bad positioning of the cap, it is necessary to control the levelness of the work jig, which has the disadvantage of increasing costs. The present invention aims to solve the above-mentioned drawbacks, and provides a large number of parallel band-shaped transparent electrodes 2 on the plate 1 during operation, and the transparent electrodes 2J. An EL element 7 having a smaller area than the electrode area is installed. However, in the EI single element 7, the light emitting layer 14 is made of the first and second dielectric materials Wi13, 15 as in the conventional example.
This comprehensively shows a configuration in which a large number of parallel back electrodes 16 are provided on the second dielectric layer 15 in a direction intersecting with the transparent electrode 2 and surrounded by the transparent electrode 2 . and,
On the transparent electrode 2 and the lath substrate 1 (which is in contact with both because it is in the shape of an a-diaphragm), a gap 4 of approximately 1[+o/+ol] in depth is sandwiched with a thickness sufficient to cover the EL element 7. A back glass plate 3 made of sorg glass or borosilicate glass formed by etching or the like is bonded with a photocurable resin or epoxy resin. On the back glass plate 3, there is an injection hole 5 with a diameter of 3-10 [m/ml] and a depth of about 1 [m/m].
A seat hole 6 of an appropriate radius is formed on the outer surface of the injection hole 5, and the tip of a metal pipe 8 for injecting the infiltrating liquid is inserted and fixed into the injection hole 5.

Next, the other end of the injection pipe 8 is first connected to an intake device (not shown), and by operating the intake device, the air present in the gap 4 of the rear glass plate 3 is sucked. Then, the suction device of the injection pipe is connected to the silicone oil tank to create a normal pressure state, so that the silicone oil in the tank is removed from the gap 4 to the outside. On the other hand, it is sucked into the cavity 4 even though the pressure is negative.

In this way, when the silicone oil is injected into the gap 4, the pipe 8 is immediately squeezed in the part connected to the back glass plate 3 of the injection pipe 8, that is, in the counterbore hole 6, as shown in FIG. A narrowed portion 8' is formed, and then the pipe 8 is cut from this portion for temporary sealing. At this time,
It is important that the outer end of the remaining piece 8" of the pipe is sufficiently lower than the outer surface of the rear glass plate 3 in relation to the next work, and the outer end of the remaining pipe 8" is coated with epoxy resin or light It is sealed by covering with an adhesive 9 such as a curable resin, and the finished state of the curable resin adhesive 9 at this time should not protrude from the surface of the back glass plate 3.

It can help prevent intrusions.

Effects of the Invention As described above, even if the moisture permeability coefficient is large due to drying, the present invention uses a fast-curing resin adhesive to temporarily fix the resin, so even if the moisture permeability coefficient is high, the resin adhesive with a small moisture permeability coefficient The glass cap is fixed early until the adhesive hardens. Therefore, the glass cap can be reliably attached to a predetermined position without being displaced.

In addition, by being able to perform such reliable sealing work, there are fewer defective parts during manufacturing, and the yield is high, and since reliable sealing can be performed, quality stability can be maintained over a long period of time. has.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, and FIG.
2 and 3 are longitudinal sectional side views of the main parts showing a series of sealing operations, respectively. FIG. 4 is an enlarged longitudinal sectional view of the main parts in a completed state. FIGS. 5 and 6 are conventional An example will be shown.Next, on the seat hole 6 of the back glass plate 3, a flat glass cap 11 of any shape such as circular, square, or polygon (other shapes such as plastic, ceramic, metal, rubber, etc. may be used). In this example, glass is used in consideration of the adhesion performance with the rear glass plate). In this case, a temporary adhesive selected from epoxy resin adhesive 10, instant adhesive, thermoplastic resin adhesive, ultraviolet curing resin adhesive, etc. is applied to either the back glass plate 3 or the glass cap 11 in advance. The fixing adhesive 12 is applied at the same time and attached. As another bonding procedure, the glass cap 11 may be temporarily attached using the temporary fixing adhesive 12, and then the highly permeable epoxy resin adhesive 10 may be penetrated by capillary action. In addition, as mentioned above, different types of temporary adhesives 12
Since the adhesive 10 for attaching the book is used, in order to prevent both adhesives from mixing initially, the peripheral edge of the surface of the glass cap 11 facing the rear glass plate 3 is made to have an inclined surface 11. Adhesive 1 for temporary soil due to the surface tension of resin
Figure 2 shows the thin film E.
An enlarged longitudinal cross-sectional side view of the L panel, FIG.
FIG. 3 is an enlarged longitudinal sectional side view of the L panel. 1...Glass substrate 3...Back glass plate 5...Injection hole 7...EL finish 8゛...Narrowed part 9...Adhesive 11...Glass cap 7 2... - Transparent electrode 4 - Gap 6... Seat hole 8... Injection pipe 8''... Remaining piece 10.12... Adhesive

Claims (1)

[Claims] 1. In a thin-film EL panel in which an EL element is held in a gap surrounded by a transparent electrode on a glass substrate and a rear glass plate, an infiltrating liquid injection hole formed in the rear glass plate and an infiltrating liquid injection hole on the rear glass plate are provided. A thin film EL panel in which an adhesive with a small moisture permeability coefficient and a fast-curing adhesive are placed in the gap formed between the glass cap and the glass cap, with the injection hole as a starting point, to adhere the glass cap. Protective liquid sealing method.