JP2002008856A - Organic el panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL panel capable of effectively utilizing a display area of a translucent substrate and miniaturization. SOLUTION: A lamination layer 6 interposing an organic layer 4 having a luminous layer between a transparent electrode (first electrode) and a back surface electrode (second electrode) is provided on a glass substrate (translucent substrate) 2 and is covered by a sealing cap (sealing member) 11. The sealing cap 11 is provided with a sealing wall part 11b covering a side end surface 2a of the glass substrate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent panel (hereinafter, referred to as an organic EL panel) having an organic layer which emits a predetermined light and is sandwiched between a first electrode serving as an anode and a second electrode serving as a cathode. In particular, the present invention relates to a bonding structure between a light-transmitting substrate on which the organic layer is provided and a sealing member provided on the light-transmitting substrate via an adhesive.

[0002]

2. Description of the Related Art As shown in FIG. 4, an organic EL panel 1 is made of an ITO (indium) on a glass substrate 2 which is a translucent substrate.
A transparent electrode (first electrode) 3 serving as an anode is formed by tin oxide) or the like, and an organic layer formed by sequentially stacking a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer on the transparent electrode 3. 4, a back electrode (second electrode) 5 serving as a non-translucent cathode such as aluminum (Al) is formed on the organic layer 4, and the organic layer 4 is formed by the transparent electrode 3 and the back electrode 5. A structure in which a sealing cap (sealing member) 7 made of a metal material is hermetically disposed on a glass substrate 2 via an ultraviolet (UV) curable adhesive 8 so as to cover the sandwiched laminate 6. Is what is done.

[0003] In such an organic EL panel 1, the sealing cap 7 is provided with a flange portion 7 a serving as a contact portion with the glass substrate 2, and a facing surface of the flange portion 7 a on the glass substrate 2 side. An adhesive 8 is provided between the glass substrate 2 and the glass substrate 2, and the glass substrate 2 and the sealing cap 7 are joined to form a storage space 9 for storing the laminate 6;
A structure for shielding the laminate 6 from the outside air is obtained.

[0004]

It is desired that such an organic EL panel 1 be mounted on a small electronic device such as a mobile phone or a wristwatch, and accordingly, the organic EL panel 1 must be downsized. . However, according to the configuration of the organic EL panel 1 described above, the sealing cap 7 has the flange portion 7 a having a predetermined ground area for joining with the glass substrate 2 so as to be along the peripheral edge of the glass substrate 2. It is necessary to provide a bonding area 10 for arranging the flange 7 a on the peripheral edge of the glass substrate 2, which limits the display area of the organic EL panel 1. There was a problem that the size could not be reduced.

Therefore, the present invention is directed to the above-mentioned problems and provides an organic EL panel which can effectively utilize a display area on a light-transmitting substrate and can be reduced in size.

[0006]

In order to solve the above-mentioned problems, the present invention provides a laminate in which at least an organic layer having a light-emitting layer is sandwiched between a first electrode and a second electrode on a light-transmitting substrate. An organic EL panel that covers the laminate with a sealing member, wherein the sealing member includes a wall portion that covers a side end surface of the light-transmitting substrate.

Further, the sealing member includes a storage portion for storing the laminate, and includes a bent portion between the storage portion and the wall portion.

Further, an adhesive is applied between the side end surface of the light transmitting substrate and the wall of the sealing member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the same or corresponding parts as those in the conventional example will be denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 1 and 2, an organic EL panel 1 is shown.
Comprises a glass substrate (translucent substrate) 2, a transparent electrode (first electrode) 3, an organic layer 4, a back electrode (second electrode) 5, and a sealing cap (sealing member) 11. Have been.

The glass substrate 2 is a light-transmitting support substrate having a rectangular shape.

The transparent electrode 3 is formed of a conductive material such as ITO on the glass substrate 2 in a predetermined pattern along the light emission shape by means such as an evaporation method or a sputtering method.

The organic layer 4 is formed by sequentially laminating a hole injecting layer, a hole transporting layer, a light emitting layer and an electron transporting layer by means such as a vapor deposition method or a sputtering method. In addition, the organic layer 5 should just have a light emitting layer at least.

The back electrode 5 is made of aluminum (Al), aluminum lithium (Al-Li), magnesium silver (Mg-Ag)
Is formed on the organic layer 5 by a method such as a vapor deposition method or a sputtering method.

As described above, the transparent electrode 3 is formed on the glass substrate 2.
, An insulating layer 4, an organic layer 5, and a back electrode 6 are sequentially laminated to form a laminate 8.

The sealing cap 11 is made of a metal material, has a storage portion 11a for storing the laminated body 6, and has a substantially L-shaped bent portion 1 from the storage portion 11a.
A sealing wall portion (wall portion) 11c for covering the side end surface 2a of the glass substrate 2 via 1b is formed to be extended. Also,
The sealing cap 11 has a cutout 11d for exposing a wiring portion (not shown) drawn from both the transparent electrode 3 and the back electrode 5 in the laminate 6 to the outside. The above-described components can be easily obtained by press molding or the like.

The sealing cap 11 is provided on the glass substrate 2 so that the storage space 10 for housing the laminated body 6 is provided.
Is composed.

In the organic EL device 1, a sealing cap 11 having a sealing wall portion 11c covering the side end surface 2a of the glass substrate 2 is formed. Adhesive 8 between the
Since both members can be hermetically bonded without providing the bonding region 10 with the sealing cap 7 on the glass substrate 2 as in the conventional organic EL panel 1, the glass substrate 2 can be made smaller. And the size of the organic EL panel 1 can be reduced. Further, since it is not necessary to secure the bonding region 10 in the glass substrate 2, the light emitting region in the glass substrate 2 can be effectively used.

Since the sealing cap 11 has a bent portion 11b between the storage portion 11a for storing the laminated body 6 and the sealing wall portion 11c, the bent portion 11b is opposed to the glass substrate 2. Since the adhesive 8 can also be applied between the surface and the glass substrate 2, the glass substrate 2 and the sealing cap 11
It is possible to more preferably secure the airtightness with the airbag. Further, by providing the bent portion 11b in the sealing cap 11, a step portion for disposing the glass substrate 2 is formed, thereby facilitating the bonding process between the translucent substrate and the sealing member. It is possible to

The sealing cap 11 of the above-mentioned organic EL panel 1 needs to be provided with a notch 11d for taking out the wiring portion between the transparent electrode 3 and the back electrode 5, but this notch is required. 11d is a sealing cap 11
1.5 mm outward from the side wall 11e of the storage portion 11a.
By having the joining piece 11f left about 3.0 mm,
Airtightness is not impaired in joining the sealing cap 11 and the glass substrate 2.

Next, another embodiment of the present invention will be described with reference to FIG. 3. The same or corresponding portions as those in the conventional example and the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Omit.

The organic EL described as an example in the above-described embodiment.
The difference from the element 1 lies in the structure of the sealing cap 12 made of a metal material. The sealing cap 12 forms a bent portion 12d by forming a step portion 12c formed so as to protrude toward the storage space 10 between the storage portion 12a and the sealing wall portion 12b.

By using the sealing cap 12 having such a bent portion 12d, the airtightness between the glass substrate 2 and the sealing cap 12 can be ensured by the adhesive 8 similarly to the above-described embodiment. In addition, by providing the bent portion 12d in the sealing cap 12, the glass substrate 2 can be provided, and the bonding process between the glass substrate 2 and the sealing cap 12 is facilitated.

In the above-described embodiment of the present invention, the notch 11 c for exposing the wiring portion between the transparent electrode 3 and the back electrode 5 in the laminate 6 to the outside is formed on one side of the sealing cap 11. However, one side of the sealing cap 11 corresponding to the place where the wiring portion is formed is configured like the flange portion 7a of the sealing cap 7 in the conventional organic EL panel 1, and this flange portion is formed. The sealing cap may be configured such that the wiring portion is exposed from 7a.

In the above-described embodiment and other embodiments of the present invention, the ends of the sealing walls 11c and 12b are substantially the same as the irradiation surface of the glass substrate 2 on which the light from the laminate 6 is irradiated. It was formed to be equivalent,
The sealing wall in the present invention may be formed to be slightly longer than the irradiation surface of the glass substrate 2 and to be bent toward the irradiation surface.

Further, in the above-described embodiment and other embodiments of the present invention, the metal sealing caps 11 and 12 have been described as examples of the sealing member. The sealing wall portion in such a case may form a thin portion at the lower end of the side wall of the recessed sealing member by etching, cutting, or the like. It can be easily obtained by configuring so as to cover the side end surface of the glass substrate.

[0027]

According to the present invention, a laminate having at least an organic layer having a light emitting layer sandwiched between a first electrode and a second electrode is provided on a light-transmitting substrate, and the laminate is sealed with a sealing member. Regarding the covering organic EL panel, since the sealing member includes a sealing wall covering the side end surface of the light-transmitting substrate,
Since the side end surface of the translucent substrate and the wall of the sealing member can be hermetically bonded by an adhesive, the size of the organic EL panel can be reduced, and the light emission in the translucent substrate can be achieved. The area can be used effectively.

Further, the sealing member has a storage portion for storing the laminate, and has a bent portion between the storage portion and the wall portion. Since an adhesive can be applied between the surface facing the light-transmitting substrate and the light-transmitting substrate, airtightness between the light-transmitting substrate and the sealing member can be more preferably ensured.

Further, by providing the bent portion on the sealing member, a step portion for arranging the light-transmitting substrate is formed, and the light-transmitting substrate and the sealing member are formed. To facilitate the bonding process.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view showing an organic EL panel according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which the organic EL panel of the embodiment is viewed from above.

FIG. 3 is an essential part cross-sectional view showing an organic EL panel according to another embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing a conventional organic EL panel.

[Explanation of symbols]

 Reference Signs List 1 organic EL panel 2 glass substrate (translucent substrate) 2a side end face 3 transparent electrode (first electrode) 4 organic layer 5 back electrode (second electrode) 6 laminated body 11, 12 sealing cap (sealing member) 11a , 12a Storage section 11c, 12b Sealing wall section (wall section) 11b, 12d Bent section

Claims (3)

[Claims] An organic layer having at least a light emitting layer is a first layer.
An organic EL, in which a laminate sandwiched between an electrode and a second electrode is disposed on a translucent substrate, and the laminate is covered with a sealing member
An organic EL panel, comprising: a panel, wherein the sealing member includes a wall portion that covers a side end surface of the translucent substrate. 2. The sealing member according to claim 1, wherein the sealing member includes a storage portion for storing the laminate, and includes a bent portion between the storage portion and the wall portion. Organic EL panel. 3. The organic device according to claim 1, wherein an adhesive is applied between the side end surface of the translucent substrate and the wall of the sealing member. EL panel.