JPH0275193A - Sealing method for thin film el panel - Google Patents

Abstract

PURPOSE:To eliminate the heat treatment after sealing and prevent the breakage of a panel due to the volume expansion of an insulating material and the omnipresence of a black dye by filling and sealing a black gelatinous or solid insulating material in a void between a panel substrate and a back substrate. CONSTITUTION:A transparent electrode 2 is arranged in parallel in a band shape on a glass substrate 1, an EL light emitting layer 4 made of a material added with MnS to ZnS is formed on it so as to be pinched by dielectric layers 3 and 5 made of Al2O3, and a back electrode 7 arranged with an Al layer in a band shape in the direction perpendicular to the electrode 2. A back substrate 8 with a filling hole 9 is then stuck, and liquid black thermosetting silicon resin is vacuum-filled through the filling hole. After it is heated and hardened, the periphery of the filling hole is cleaned, and a sealing plate 13 is stuck with epoxy resin 12 to seal the hole. A panel is not broken due to heating after sealing, and the contrast of the thin film EL panel can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides EL (Electrical
The present invention relates to a method for manufacturing a thin-film EL panel that emits light, and particularly to a method for sealing the same.

(Prior art) Generally, a thin film EL panel has a structure in which a transparent electrode is provided on a glass substrate, an EL thin film is provided on a panel substrate, and a back electrode is further provided on the panel substrate.A thin film EL element is insulated from the back substrate. It is sealed using a flexible material.

In addition, for this ELN film, the EL light emitting layer made of Mn-doped ZnS or Zn5e is replaced with Aρ 203 or Ti.
A double insulation structure sandwiched between a first dielectric layer (lower layer) and a second dielectric layer (upper layer) made of O3, etc. has been developed, and thin-film EL panels obtained using this EL thin film are insulated. It has excellent voltage resistance, luminous efficiency, and operational stability.

In the manufacture of such thin film EL panels, silicone oil has conventionally been used as an insulating material;
As shown in the figure, an insulating material injection hole 9 is provided in the rear substrate 8, and after silicone oil 7 is injected from the injection hole through an injection tube, a columnar aluminum piece 11 is inserted into the injection hole 9 for temporary sealing. A method of sealing is mainly used in which the injection hole is sealed with a glass piece 13 using an epoxy resin 12. This temporary sealing is performed because silicone oil and the epoxy resin used for sealing are incompatible, and the sealing process becomes complicated.

Further, in an EL panel sealed by such a method, it is necessary to block external light on the rear substrate side in order to improve the contrast during light emission. Conventionally, in order to block external light, (1) black paint made of heat-curable resin is applied to the outside of the back glass.

(2) Coloring silicone oil with dye.

Such measures have been taken. However, in method (1), since the glass piece 13 used for sealing protrudes from the back glass, it is difficult to apply black paint to the side and peripheral parts of the glass piece, and furthermore, the insulating sealing material Since the paint is heated and cured after the injection hole is sealed, there is a problem in that the silicone oil injected between the panel substrate and the rear substrate expands in volume, resulting in damage to the rear substrate. In addition, in method (2), the dye is not sufficiently dissolved in the silicone oil, so if it is used in a stationary state for a long time, the dye will be unevenly distributed, and this uneven distribution will not be able to sufficiently block external light. There is a problem in that the contrast deteriorates.

(Problems to be Solved by the Invention) An object of the present invention is to provide a thin film EL panel that solves the above-mentioned problems, has an effect of improving contrast, and is easy to manufacture.

(Means and effects for solving the problem) The present inventors"
1st record 5! In order to solve this problem, we conducted extensive research on the insulating material that is injected into the panel during sealing.
The present invention has now been completed. That is, in the present invention, after bonding the panel substrate and the back substrate together using a sealing resin,
In a thin film EL panel sealing method in which an insulating material is injected into the gap provided between both plates through an injection hole provided on the rear substrate side, and then the injection hole is sealed, a black material is used as the insulating material. This is a method for sealing a thin-film EL panel, characterized by using a gel-like or solid-state insulating material.

In the thin film EL panel sealing method of the present invention, a black gel-like or solid insulating material is used as the insulating material injected into the panel. Examples of this material include thermosetting or photocurable butyl rubber resin, styrene butadiene rubber resin, chloroprene resin, acrylic resin,
Examples include silicone resin, but there are no particular limitations as long as it is black, liquid when injected from the injection hole, and has excellent electrical properties.

Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view showing an example of a thin film EL panel sealed by the method of the present invention.

The sealing method of the present invention includes, for example, injecting the above-mentioned insulating material 14 in a liquid state through an injection tube through an injection hole 9 provided in the rear substrate 8, and then gelling the material by heating or irradiating it with light. Alternatively, the injection hole 9 can be solidified and then sealed with the epoxy resin 12 and the sealing plate 13. In addition, the excess injected insulating material flows out from the injection hole 9 and solidifies when the material gels or solidifies, so if the hole is sealed after cutting off this solidified material, temporary sealing can be achieved. It becomes possible to seal the holes using only the epoxy resin 12 and the sealing plate 13 without requiring any.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

EXAMPLE As shown in FIG. 1, a large number of transparent electrodes 2 were arranged in parallel in strips on a substrate 1 made of glass. Next, a first dielectric layer 3 made of Aρ 203 was placed on the transparent electrode 2 by 2000 people, an EL light emitting layer 4 made of ZnS with MnS added thereto by 9000 people, and a third dielectric layer 3 made of Aβ 203 was placed on top of that by 9000 people. After forming 2,000 second dielectric layers 5 by sputtering, a 6,000-thick aluminum layer is deposited on the second dielectric layer 5, and the aluminum layer is formed into a strip in a direction perpendicular to the transparent electrode 2. Then, the back electrode 7 was formed.

Next, a back substrate 8 having injection holes 9 (thickness: 1,
1. m IN ) was attached to the glass substrate 1 and the transparent electrode 2 via the epoxy resin 12 to obtain a panel before injecting the insulating curable resin.

Insert the injection tube into the injection hole 9 of this panel, place it in a vacuum dryer together with a container containing liquid black thermosetting silicone resin, and use a vacuum pump to remove the air inside the vacuum dryer and the panel. After removing the air inside the dryer and the air dissolved in the thermosetting resin, the pressure inside the dryer was returned to atmospheric pressure, and the thermosetting resin was injected into the panel through the injection pipe.

After injection, remove the injection tube, take out the panel and clean it.
It was placed in the dryer again, and the thermosetting resin was heated and cured at 150°C for 30 minutes. After that, it is slowly cooled and the injection hole 9 of the panel is
Clean the area around the hole sealing plate 13 with epoxy resin 12.
was glued so as to cover injection hole 9 to form 1.1 hole.

The resulting thin film EL panel had excellent contrast.

(Effects of the Invention) As described above, according to the thin-film EL panel sealing method of the present invention, the encapsulating material injected into the panel, the black insulating gel-like compound, or the black insulating solid material Therefore, it is not necessary to perform heat treatment after sealing the insulating material injection hole, so that damage to the panel due to volume expansion of the insulating material can be prevented when improving contrast. Further, according to the present invention, there is a contrast without uneven distribution of black dye.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a thin film EL panel sealed by the method of the present invention. FIG. 2 is a cross-sectional view of a thin film EL panel sealed by a conventional method. In the figure, ]... Substrate 2... Transparent electrode 3... First dielectric layer 4... EL light emitting layer 5... Second dielectric layer 6... Back electrode 7 Silicone oil 8.
... Rear substrate 9 ... Injection hole 10 ... Epoxy resin 11 ... Aluminum piece 12 ... Epoxy resin 13 ... Sealing plate 14 ... Black gel-like or solid insulating material Each is shown.

Claims (1)

[Claims] (1) After pasting the panel substrate and the back substrate together with a sealing resin, insulating material is injected into the gap between the two substrates through the injection hole provided on the back substrate side, and then the injection hole is sealed. A method for sealing a thin film EL panel with holes, the method comprising using a black gel-like or solid insulating material as the insulating material.