JPH01231292A - Sealing method for el panel - Google Patents

Abstract

PURPOSE:To seal an opening so as to prevent thermal damage by forming a gap and the opening while bonding a sealing plate to a panel main body by the use of an adhesive agent, heating same under the same vacuum conditions as a moisture preventing liquid, introducing dry inactive gas after putting the opening in the liquid, and pouring the liquid into the gap. CONSTITUTION:A sealing plate 19 and an EL panel main body 18 formed with an EL element 17 on a transparent base 11 are bonded with a filmlike adhesive agent 20 so as to form a gap, and the EL panel 18 bonded but not sealed and a moisture preventing oil 21 are respectively heated under the same vacuum conditions. Dry inactive gas N2 is introduced under a state that an opening 22 of the panel 18 is dipped into the oil 21, and returned under the atmosphere, then the oil 21 is poured into the gap. It is thus possible to extend the service life without intrusion of moisture at the time of sealing and to prevent thermal damage as the expansion of dimensions due to thermal expansion is not too large.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The invention relates to a method for sealing a gL panel that displays by electroluminescence or is used as a surface light source.

(Prior art) The conventional method for sealing the E L/” flannel is disclosed in Japanese Patent Application Laid-Open No. 1986-64.
This is disclosed in Publication No. 096 and the like. This conventional g L
A method of sealing the /e channel will be explained with reference to FIG.

A transparent electrode 2 is provided on the glass substrate 1. First insulating layer 3. Light emitting layer 4. Second insulating layer5. An EL element is formed by stacking 111 back electrodes 6.

As the envelope 7, a glass plate having a thickness of, for example, 3 mm is etched as a bonding part, leaving a periphery of the outer periphery, and a space of a depth of 3 mm is provided, and an injection lower a is provided for injecting silicone oil. After heating and drying the glass substrate l and the envelope 7 in a vacuum or an inert gas, an adhesive made of epoxy resin or the like is applied to the adhesive part of the envelope 7, and the glass is bonded so as to house the EL element. The substrate 1 and the envelope 7 are bonded together using an adhesive portion 8. Thereafter, silicone oil 9 or silicone oil mixed with molecular powder or the like is injected from the injection lower a, and then the injection lower a is adhesively sealed with a glass plate lO or the like.

(Problem to be Solved by the Invention) However, even with the method described above, a thick glass plate is machined and stretched when producing the envelope 7, so the envelope 7 and the glass substrate 1 are Since the space between them becomes larger and the injection volume of the silicone oil 9 becomes larger, the thermal expansion of the silicone oil 9 at high temperatures causes g'L, /
#There was a problem that the flannel was broken0 Also, because the resin of the adhesive part 8 spreads to the outside image side of the adhesive part 8 when bonded to the glass substrate 1, the EL element and the connecting terminal part are not fully connected to the adhesive part 8. The problem was that the EL-sonel had to be formed with a certain margin, making the EL-sonel larger.

Furthermore, although measures have been taken to prevent moisture from entering the EL panel, they are not sufficient, and there have been problems such as the failure of thin-film EL elements that are sensitive to moisture.

The present invention solves the above-mentioned problems of increase in size, thermal damage, and moisture countermeasures, sufficiently removes moisture that enters during sealing, prolongs the service life, and obtains an EL panel that is compact and highly resistant to high temperatures. The purpose of the present invention is to provide a method for sealing an EL panel.

(Means for Solving the Problems) A method for sealing an EL panel according to the present invention is to heat-bond a sealing plate to an EL channel body having an EL element via a film adhesive to close gaps and openings. This unsealed EL panel and the moisture-proofing liquid are heated in the same vacuum, and the moisture-proofing liquid is injected into the gap by introducing a dry inert gas with the opening section immersed in the moisture-proofing liquid. , seal the opening after injection.

(Function) Since the method for sealing an EL panel in this invention uses a film adhesive, the adhesive does not spread from the bonded portion between the EL panel body and the sealing plate, and therefore the gap space can be reduced. It can be effectively used for EL devices, and the unsealed panel and moisture-proofing liquid are heated in vacuum to dehydrate, defoamer, and dry to prevent moisture from entering, and by introducing dry inert gas, the gap can be closed. Moisture-proofing liquid is released due to the pressure difference between inside and outside.
Inject to prevent moisture from entering.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a flowchart of a method for sealing an EL panel according to an embodiment of the present invention, FIG. 2 is a process explanatory diagram of a method for sealing an EL panel according to an embodiment, and FIG. E L formed by the E L /# channel sealing method according to the example
"This is a cross-sectional view of the structure of the flannel.

First, the structure of the IEL panel will be explained with reference to FIG. 3 in order to make it easier to understand the method of sealing the g l, /4' channel according to the present invention. A transparent electrode 12 is placed on the glass substrate 11. First insulating layer 132 light emitting layer 14. Second insulating layer 15
．． A well-known thin film EL in which back electrodes 16 are sequentially laminated.
An element 17 is formed.

The glass substrate 11 and the EL element 17 constitute an EL panel main body 18. The sealing plate 19 is attached to the transparent electrode 1 via a film adhesive 20 so as to house the EL element 17.
2 is bonded onto a glass substrate 1 containing 2. The gap is filled with a moisture-proof oil 21 such as silicone oil.

Next, a method for sealing an EL panel according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

First, step 2. As shown in Figure S1 and Figure 2(a),
An EL/channel body 18 having an EL element 17 formed on a glass substrate 11 and a sealing plate 19 made of, for example, a glass plate, a ceramic plate, or a resin plate are prepared.

Next, as shown in step S2 and FIG. 2(b), on one side of the rectangular sealing plate 19, approximately 2
A μm thick film adhesive 20 is temporarily attached.

Next, as shown in step S3 and FIG. 2(c), the glass substrate 11 and the sealing plate 19 are aligned so as to sandwich the film adhesive 20 and incorporate the EL element 17.
01~l (-pressure decay, 20 at 120°C~150°C
A gap is formed between them by heat and pressure bonding for about a minute. In this case, since the film adhesive 20 does not spread outward, the inside of the film adhesive 20 and the outside of the EL cord 17 can be brought very close together.

In addition, since there is almost no deformation of the film adhesive 20 in the height direction, it is possible to reduce the dimensional error of the gap and improve the EL.
The distance between the element 17 and the sealing plate 19 can be made extremely close, and the internal gap space can be made extremely small. Further, an opening 2 is provided between the ends of the film adhesive 20.
2 is formed.

Next, as shown in step 84 and FIG. 2(d), the bell jar 23 of the vacuum device is opened, and silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., with a viscosity of 1
Add moisture-proof oil 21 such as 00cps). In addition, an unsealed E which is an EL panel main body 18 in which a sealing plate 19 is adhered to a movable table 26 that can heat an attached object and is movable up and down.
The above unsealed E with the opening 22 of the L/# flannel facing downward.
i, /# Put on the flannel. After that, the bell jar 23 is closed, and the inside of the bell jar 23 is evacuated to about 0,0 Torr by a vacuum pump from the vacuum port 27, and then the moisture-proof oil 21 is heated by the heater 24, and the moisture-proof oil 21 is heated from the EL-channel main body 18, etc. Heating the unsealed B L /# flannel consisting of
Dehydrate, defoamer or dry them.

Next, as shown in step 85 and FIG. 2(e), the EL
/e The unsealed EL panel consisting of the flannel main body 18 and the like is pulled down and the entire opening 22 is immersed in the moisture-proof oil 21 in the container 25.

Next, as shown in Stella fS6 and Figure 2 (e), the vacuum is stopped and dry N and gas are gradually injected into the bell jar 23 from the injection port 28 to gradually return the interior of the bell jar 23 to atmospheric pressure to prevent moisture. Apply oil 21 to the EL panel main body 18 and sealing plate 19
It is injected due to the pressure difference between the gears and gears.

Next, as shown in step S7, the K and E L flannel bodies 18 injected with moisture-proof oil 21 are taken out into the drying chamber, and the openings 22 are sealed with, for example, an adhesive (however, moisture is removed in the same manner as above). ) of the structure shown in Figure 3.
I, /# make it a flannel.

(Effects of the Invention) As described above, according to the sealing method according to the present invention, a gap is formed between the sealing plate and the EL/gunnel body in which the EL element is formed on the transparent substrate using a film adhesive. The unsealed EL/4' flannel and the moisture-proof oil are heated individually in the same vacuum, and the unsealed EL/4' flannel and the moisture-proof oil are heated in the same vacuum.
Dry inert gas is introduced while the opening of the L-channel is immersed, and moisture-proof oil is injected into the gap after returning to the atmosphere, so moisture does not enter during sealing and the product life is extended. The rounded KEL element, which can be stretched sufficiently and the film adhesive does not spread from the adhesive part, can be placed close to the inside of the film adhesive, and the contact and terminal parts can be shortened. Since the distance between the device and the EL element can be made small, the capacity of the moisture-proof oil can be made small, and the whole device can be made compact, and the dimension expansion due to thermal expansion does not increase too much, so there is an effect that thermal damage will not occur.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram of a method for sealing an EL panel according to an embodiment of the present invention, FIG. 2 is a process explanatory diagram of a method for sealing an EL panel according to an embodiment, and FIG. One implementation f!
iI! Structural cross-sectional view of EL/J channel formed from IK,
FIG. 4 is an explanatory diagram of a conventional method of sealing a flannel in an EL-. 11... Glass substrate, 17... EL element, 18...
- EL knockle body, 19... Sealing plate, 20... Film adhesive, 2nd process... Moisture-proof oil, 22... Opening. First evil

Claims (1)

[Claims] A step of thermally adhering a sealing plate to an EL panel body having an EL element via a film adhesive to form a gap and an opening in which the EL element is incorporated, and A step of heating an unsealed EL panel and a moisture-proofing liquid separately in the same vacuum, a step of introducing a dry inert gas into the moisture-proofing liquid with the opening placed inside the moisture-proofing liquid, and sealing the opening. A method for sealing an EL panel, comprising the step of sealing with a member.