JP2001307874A - Electroluminescent element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroluminescent element in which there is less fear of disconnection to an electric rear face electrode. SOLUTION: An organic EL element 10 has a substrate 11, a laminated material 12, and a sealing member 13. The laminated material 12 is composed of a transparent electrode 14, an insulating layer 15, an organic layer 16, and a rear plate 17. The transparent electrode 14 has a negative electrode terminal part 14d. The insulating layer 15 is formed so as to be partly overlapped with the negative electrode terminal part 14d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electroluminescent device (E).
L element).

[0002]

2. Description of the Related Art Conventionally, there is an organic electroluminescent device 1 (hereinafter referred to as an organic EL device) shown in FIG. The organic EL element 1 is obtained by forming a laminate 3 on a glass substrate 2 by a vapor deposition method. The laminate 3 has a transparent electrode 4, an insulating layer 5, an organic layer 6, and a back electrode 7. The organic layer 6 includes a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and is sandwiched between the transparent electrode 4 and the back electrode 7. The laminate 3 is covered with a sealing glass 8, and the sealing glass 8 is bonded to the glass substrate 2 with an adhesive. The transparent electrode 4 has an anode terminal portion 4a and a cathode terminal portion 4b, and is formed such that one end of the cathode terminal portion 4b is electrically connected to the back electrode 7. When the power supply 9 is connected to the anode terminal 4a and the cathode terminal 4b, the light emitting layer emits light and the light emitting segment S
Shines.

[0003]

It is desirable that the back electrode 7 be formed with a uniform thickness over the entire surface. However, since the back electrode 7 on the insulating layer 5 and the back electrode 7 on the glass substrate 2 are connected at the peripheral portion 5a of the insulating layer 5 having the step H1, the back electrode 7 is connected to the peripheral portion 5a of the insulating layer 5. There was a problem that it was easily interrupted in the vicinity. This problem,
In the vicinity of the peripheral portion 5a of the insulating layer 5, a step H from the glass substrate 2 is formed.
Since 1 is large, when the back electrode 7 is formed by the vapor deposition method,
This is presumed to be because the back electrode material (aluminum or the like) does not easily adhere. When the back electrode 7 is disconnected, the light emitting segment S does not shine even when the power supply 9 is connected to the anode terminal portion 4a and the cathode terminal portion 4b, so that the organic EL element 1 is defective. Therefore, there is a problem that the yield is reduced. The present invention has been made in view of this problem, and has as its object to provide an electroluminescent device in which the rear electrode is less likely to be disconnected.

[0004]

According to the present invention, there is provided an electroluminescent device comprising a substrate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode laminated on a substrate. The insulating layer is formed so as to partially overlap the cathode terminal of the transparent electrode.

The present invention also relates to an electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the insulating layer comprises a cathode terminal of the transparent electrode. And a contact hole in a part of the region facing the back electrode.

The present invention also relates to an electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer and a back electrode is laminated on a substrate, wherein the transparent electrode comprises a lead portion, and the lead portion. A display segment portion connected to one end of
It has an anode terminal portion and a cathode terminal portion connected to the other end of the lead portion, and the insulating layer has a contact hole in a part of a region where the cathode terminal portion and the back electrode face each other. .

Further, according to the present invention, the insulating layer has a plurality of the contact holes.

[0008] The present invention also includes a sealing member having a concave portion covering the laminated body and adhered to the substrate.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An organic EL device 10 includes a substrate 11,
It has a laminate 12 and a sealing member 13. Laminate 12
Is composed of a transparent electrode 14, an insulating layer 15, an organic layer 16, and a back electrode 17. The transparent electrode 14 is connected to the lead 1
4a, a display segment 14b, an anode terminal 14c, and cathode terminals 14d and 14e. Insulating layer 15
Are formed so as to partially overlap the cathode terminal portions 14d and 14e. An opening 15a is provided in the insulating layer 15 at a position corresponding to the display segment 14b of the transparent electrode 14. The insulating layer 15 has a cathode terminal portion 14d,
Contact holes 15b and 15c are provided in a part of the region where the rear electrode 14e and the rear electrode 17 face each other, and the rear electrode 17 is electrically connected to the cathode terminal portions 14d and 14e through the contact holes 15b and 15c.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show the first embodiment. The organic EL element 10 has a glass substrate 11 (substrate), a laminate 12, and a sealing glass 13 (sealing member).
The laminate 12 includes a transparent electrode 14 made of ITO (Indium Tin Oxide) and an insulating layer 1 made of a polyimide-based resist.
5, an organic layer 16 and a back electrode 17 made of a metal such as aluminum. The back electrode 17 is formed on the rear surface of the glass substrate 11 by vapor deposition. The organic layer 16 has at least a light emitting layer 16a. The organic layer 16 includes a hole injection layer 16b, a hole transport layer 16c, and an electron transport layer 16c.
d may be provided (see FIG. 2).

As shown in FIG. 4, the transparent electrode 14 includes a lead portion 14a, a display segment portion 14b connected to one end of the lead portion 14a, an anode terminal portion 14c connected to the other end of the lead portion 14a, and a cathode terminal portion. 14d. The display segment portions 14b are arranged in a Japanese character shape, and lead portions 14a are respectively connected to the display segment portions 14b. The lead portion 14a is routed to one side of the glass substrate 11, and the anode terminal portion 14c is provided continuously. The anode terminal portion 14c and the cathode terminal portion 14d are arranged in a row on one side of the glass substrate 11.

The lead portion 14a and the display segment portion 14b of the transparent electrode 14 are insulated from the back electrode 17 by the insulating layer 15. An opening 15a is provided in the insulating layer 15 at a position corresponding to the display segment 14b of the transparent electrode 14. The insulating layer 15 includes a display segment 14b.
Are formed so as to slightly overlap with the peripheral edge of the light emitting segment S, and the contour of the light emitting segment S is defined by the opening 15 a of the insulating layer 15. That is, the shape of the light emitting segment S is the same as the shape of the opening 15a. The insulating layer 15 is the cathode terminal 1
The insulating layer 15 has a rectangular contact hole 15b. The contact hole 15b is formed at a position corresponding to the cathode terminal portion 14d, and the back electrode 17 is electrically connected to the cathode terminal portion 14d through the contact hole 15b.

Reference numeral 18 denotes an ultraviolet-curing adhesive, which is used to seal the rear surface of the glass substrate 11 with the sealing glass 1.
The third bonding surface 13a is bonded. The sealing glass 13 has a concave portion 13b covering the laminate 12, and the front surface of the sealing glass 13 excluding the concave portion 13b is an adhesive surface 13a. Reference numeral 19 denotes a desiccant, which is injected from an inlet (not shown) of the sealing glass 13 and filled in the recess 13b.

FIG. 5 shows a second embodiment. In the second embodiment, the cathode terminal portion 14e and the contact hole 15c
However, only the difference from the first embodiment is the same as that of the first embodiment, and therefore, in FIG. 5, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. The insulating layer 15 has a contact hole 15c at a position corresponding to the cathode terminal portion 14e of the transparent electrode 14. Two contact holes 15c are formed for one cathode terminal portion 14e.

According to each embodiment described above, the insulating layer 1
5 is formed so as to partially overlap the cathode terminal portions 14d and 14e, the step H2 is reduced, and the possibility that the back electrode 17 is disconnected is reduced. Also, the contact holes 15b,
By bringing the back electrode 17 into contact with the cathode terminal portions 14d and 14e at 15c, the back electrode 17 on the insulating layer 15 and
Since the back electrodes 17 on the cathode terminal portions 14d and 14e are connected all around the four sides of the rectangular contact holes 15b and 15c, reliability is increased, and improvement in yield can be expected. Furthermore,
The reliability is further improved by providing a plurality of contact holes 15c as in the second embodiment.

In each of the embodiments, the light-emitting segments S arranged in the shape of a Japanese character are illuminated in the electroluminescent display element. For example, almost the entire surface which can be used as a backlight of a liquid crystal display element shines. It may be an electroluminescent lighting element.

[0017]

According to the present invention, there is provided an electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the insulating layer comprises a cathode terminal portion of the transparent electrode. In this case, the reliability of conduction between the back electrode and the cathode terminal is improved, and an improvement in yield can be expected.

The present invention also relates to an electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the insulating layer comprises a cathode terminal of the transparent electrode. In addition, a contact hole is provided in a part of the region where the back electrode faces, and the reliability of conduction between the back electrode and the cathode terminal portion is improved, and an improvement in yield can be expected.

The present invention also relates to an electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer and a back electrode is laminated on a substrate, wherein the transparent electrode comprises a lead portion, and the lead portion. A display segment portion connected to one end of
It has an anode terminal portion and a cathode terminal portion connected to the other end of the lead portion, and the insulating layer has a contact hole in a part of a region where the cathode terminal portion and the back electrode face each other. In addition, the conduction reliability between the back electrode and the cathode terminal is improved, and an improvement in yield can be expected.

Further, according to the present invention, the insulating layer has a plurality of the contact holes, and further improvement in yield can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an organic layer according to the embodiment.

FIG. 3 is a front view showing the embodiment.

FIG. 4 is an exploded perspective view showing the embodiment.

FIG. 5 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 organic EL element (electroluminescent element) 11 glass substrate (substrate) 12 laminate 13 sealing glass (sealing member) 14 transparent electrode 14d cathode terminal section 14e cathode terminal section 15 insulating layer 15b contact hole 15c contact hole 16 organic layer 16a light emitting layer 17 back electrode

Claims (5)

[Claims] 1. An electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the insulating layer partially overlaps a cathode terminal portion of the transparent electrode. An electroluminescent device characterized by being formed as described above. 2. An electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the insulating layer includes a cathode terminal portion of the transparent electrode, and the back surface. An electroluminescent device having a contact hole in a part of a region facing an electrode. 3. An electroluminescent device in which a laminate having at least a transparent electrode, an insulating layer, a light emitting layer, and a back electrode is laminated on a substrate, wherein the transparent electrode is connected to a lead portion and one end of the lead portion. A display segment portion, an anode terminal portion connected to the other end of the lead portion, and a cathode terminal portion, wherein the insulating layer has a contact hole in a part of a region where the cathode terminal portion and the back electrode face each other. An electroluminescent device comprising: 4. The electroluminescent device according to claim 2, wherein the insulating layer has a plurality of the contact holes. 5. The electroluminescent device according to claim 1, further comprising: a sealing member having a concave portion covering the stacked body and being bonded to the substrate. Electroluminescent device.