JP3565277B2 - Organic EL panel - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic EL panel formed by forming an organic EL element in which at least one of an organic layer having a light emitting layer is sandwiched between a pair of translucent electrodes at a plurality of locations on a translucent substrate. is there.
[0002]
[Prior art]
2. Description of the Related Art As an organic EL (electro luminescence) panel, for example, those disclosed in Patent Documents 1 and 2 are known. As shown in FIG. 4, such an organic EL panel 1 has a transparent electrode (first electrode) 3 serving as an anode made of ITO (indium tin oxide) on a glass substrate (translucent substrate) 2 made of a glass material. An insulating layer 4 made of a polyimide or phenol-based photosensitive resin material; an organic layer 5 consisting of a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer; Al) or other non-translucent back electrode (second electrode) 6 is sequentially laminated to form an organic EL element 7 as a laminate, and the organic EL element 7 is sealed in a concave shape made of a glass material. The member 8 is provided by airtightly disposing the member 8 on the glass substrate 2 with an ultraviolet curable adhesive 9 interposed therebetween.
[0003]
[Patent Document 1]
JP-A-2002-8855 [Patent Document 2]
JP-A-2002-25769
[Problems to be solved by the invention]
The insulating layer 4 in the above-mentioned organic EL panel 1 often uses an organic substance such as a polyimide-based or phenol-based organic substance having relatively high absorbency. The insulating layer 4 partially covers the periphery of the transparent electrode 3 in order to ensure electrical insulation of the transparent electrode 3 from the back electrode 6 or to sharpen the contour of the light emitting portion (organic layer 5). It is configured to be covered and covered by the organic layer 5 and the back electrode 6. However, when the insulating layer 4 is exposed to a high-temperature state (heat generated by application of a driving current or a high-temperature state due to an ambient environment) or ultraviolet rays, moisture is released from the insulating layer 4 and outgassing occurs. Therefore, the organic layer 5 overlapping the end portion (edge portion) of the insulating layer 4 is damaged due to the release of moisture and the generation of outgas by the insulating layer 4, and as a result, the non-light emitting portion is shifted from the organic layer 5 as the light emitting region. It has a problem that it generates and grows and not only deteriorates the display quality but also shortens the life of the organic EL panel 1.
[0005]
In view of the above, the present invention focuses on the above-described problems, and suppresses an adverse effect on the organic layer due to moisture and outgas released from the insulating layer, thereby realizing a longer life of the organic EL panel. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, according to the present invention, as described in claim 1, a display segment formed of a light-transmitting first electrode formed on a light-transmitting substrate, and a peripheral edge of the display segment are formed. An insulating layer formed on the translucent substrate so as to cover, a substantially inverted trapezoidal wall formed on the insulating layer along the contour of the display segment, and An organic layer formed and having at least a light-emitting layer, a second electrode formed on the organic layer, and provided between the organic layer and the wall to reach the insulating layer from the second electrode. And an opening to be formed.
[0007]
Further, as described in claim 2, the wall portion is formed in a broken line shape or a linear shape.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
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.
[0009]
An embodiment of the present invention will be described with reference to FIGS. The organic EL panel 1 mainly includes a glass substrate (translucent substrate) 2, a transparent electrode 3, an insulating layer 4, a wall portion 10, an organic layer 5, a back electrode 6, and a sealing member 8. It is configured.
[0010]
The glass substrate 2 is a light-transmitting support substrate having a rectangular shape.
[0011]
The transparent electrode 3 is formed by depositing a conductive material such as ITO on the glass substrate 2 by a method such as a vapor deposition method or a sputtering method. Each of the lead portions 3b is provided with an electrode terminal 3c provided at the end of the lead portion 3b, and a constant current from a power supply circuit (not shown) can be selectively applied to each display segment 3a. I have a possible structure. In the electrode terminals 3c, lead portions 3b corresponding to the respective display segment portions 3a are drawn out so as to be intensively arranged on one side of the glass substrate 2.
[0012]
The insulating layer 4 is made of, for example, a polyimide-based or phenol-based insulating material, and is formed by, for example, a photolithography method. The insulating layer 4 has an opening corresponding to the display segment 3a, and the opening is formed so as to slightly overlap the periphery of the display segment 3a of the transparent electrode 3 in order to clearly display the outline of the light emitting region. In addition, it is disposed on the glass substrate 2 to ensure insulation between the transparent electrode 3 and the back electrode 6.
[0013]
The wall portion 10 is made of an electrically insulating material made of a photosensitive resin such as a phenol-based resin, and is formed in a substantially inverted trapezoidal shape (overhang shape) so as to be located near the location where the organic layer 5 is formed. The thickness 10 in the height direction is formed so as to be larger than the film thickness on which the transparent electrode 3, the insulating layer 4, the organic layer 5, and the back electrode 6 are deposited. The wall portion 10 is formed in a dashed line shape or a linear shape so as to avoid the lead portions 3b of the display segment portion 3a in the shape of the sun and along the outer contour (outline) of each display segment portion 3a. is there. In addition, the wall portion 10 in the outer periphery of the display segment 3a in the shape of the sun is formed so as to avoid the lead portion 3b, but the wall portion 10 in the inner contour (outline) of the display segment portion 3a has a closed loop shape. It is formed.
[0014]
The organic layer 5 may have at least a light emitting layer, but in the embodiment of the present invention, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially laminated by means such as a vapor deposition method. It is formed. The organic layer 5 is formed on the transparent electrode 3, the wall 10, and the insulating layer 4.
[0015]
The back electrode 6 is made of a metallic conductive material such as aluminum (Al), aluminum lithium (Al: Li), magnesium silver (Mg: Ag), an organic layer 6, a wall 10 by means of a vapor deposition method or a sputtering method. And formed on the insulating layer 4, and serves as a common electrode of the light emitting section (display segment section 3 a) in the organic layer 5. The back electrode 6 is electrically connected to a cathode electrode terminal 6 a provided on one side of the glass substrate 2 so as to be adjacent to each electrode terminal 3 c of the transparent electrode 3. The electrode terminal 6a is formed of the same material as the transparent electrode 3 in an elongated shape along the width direction of the back electrode 6.
[0016]
As described above, the transparent electrode 3, the insulating layer 4, the organic layer 5, and the back electrode 6 are sequentially laminated on the glass substrate 2 to form a laminate, whereby the organic EL element 7 is obtained.
[0017]
The sealing member 8 is formed by forming a concave portion 8a as a storage portion on a flat plate member made of, for example, a glass material. In the sealing member 8, a support portion 8b formed so as to surround the concave portion 8a is hermetically disposed on the glass substrate 2 via, for example, an ultraviolet curing epoxy resin adhesive 9. The sealing member 8 is slightly smaller than the glass substrate 2 so that the electrode terminal 3c of the transparent electrode 3 and the electrode terminal 6a of the back electrode 6 are exposed to the outside.
[0018]
The organic EL panel 1 is configured by the above-described components. The feature of the above-described first embodiment is that the wall portion 10 provided near the organic layer 5 separates the back electrode 6 from the insulating layer. 4 in that it has an opening 11 that reaches four. That is, in the organic EL panel 1, since the wall 10 provided near the organic layer 5 is formed in a substantially inverted trapezoidal shape, the organic layer 5 and the back electrode 6, which should cover the insulating layer 4, are cut into a stepped state. (Hereinafter, referred to as a step break), and an opening 11 is formed at a place where the step break is formed.
[0019]
Therefore, moisture and outgas generated when the insulating layer 4 is exposed to a high temperature state or ultraviolet rays can be released from the opening 11 formed along the contour of the display segment 3a. Since the adverse effect on the element 7 can be suppressed, the life of the organic EL panel 1 can be extended. The released moisture is absorbed by a moisture absorbing member (not shown) provided in the storage space of the organic EL element 7 composed of the glass substrate 2 and the sealing member 8.
[0020]
【The invention's effect】
According to the present invention, an organic EL element including a first electrode having a display segment portion, an organic layer, and a second electrode is formed on a light-transmitting substrate, and the sealing member covers the organic EL element so as to cover the organic EL element. With respect to the organic EL panel provided on the conductive substrate, it is possible to suppress the adverse effect on the organic layer due to moisture or outgas released from the insulating layer, and to achieve a longer life of the organic EL panel.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of an organic EL panel according to an embodiment of the present invention.
FIG. 2 is a plan view of the organic EL panel of the embodiment.
FIG. 3 is a sectional view of a main part of a conventional organic EL panel.
[Explanation of symbols]
1 Organic EL panel 2 Glass substrate (translucent substrate)
3 Transparent electrode (first electrode)
4 insulating layer 5 organic layer 6 back electrode (second electrode)
7 Organic EL element 10 Wall 11 Opening

Claims (2)

A display segment comprising a light-transmitting first electrode formed on a light-transmitting substrate;
An insulating layer formed on the light-transmitting substrate so as to cover a peripheral portion of the display segment portion;
A generally inverted trapezoidal wall formed on the insulating layer so as to follow the contour of the display segment,
An organic layer formed on the display segment portion and having at least a light emitting layer,
A second electrode formed on the organic layer;
An opening formed between the organic layer and the wall portion and provided to reach the insulating layer from the second electrode;
The organic EL panel characterized in that it comprises a. The organic EL panel according to claim 1, wherein the wall is formed in a broken line or a line .

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