JP2004119226A - Organic el panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel without possibility of peeling-off an insulating film from a substrate. <P>SOLUTION: The organic EL panel 11 is formed by providing an organic EL element and the insulating film 14 on the substrate 12. The El element has a first electrode 15, a light-emitting layer and a second electrode 17. The insulating film 14 prevents short circuit of the first electrode 15 with the second electrode 17. A peeling-off preventing part 32 for preventing peeling-off the insulating film 14 from the substrate 12 is provided between the substrate 12 and at least part 14a, 14b, and 14c of the ends of the insulating film 14. The peeling-off preventing part 32 is grounded. The peeling-off preventing part 32 is made of a hydrophobic material. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic EL panel in which an organic EL element having a light emitting layer sandwiched between a first electrode and a second electrode is formed on a substrate.
[0002]
[Prior art]
Conventionally, various organic EL panels have been proposed, for example, disclosed in Patent Document 1. The organic EL panel 1 has an organic EL element 3 and an insulating film 4 formed on a glass substrate 2 (see FIG. 5). The organic EL element 3 has a first electrode 5 made of indium tin oxide (ITO), an organic layer 6, and a second electrode 7 made of a metal layer such as aluminum (Al). The insulating film 4 is made of a resist material such as polyimide, and prevents the second electrode 7 from short-circuiting with the first electrode 5.
[0003]
[Patent Document 1]
JP 2001-267066 A
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 first electrode 5 and the second electrode 7. The organic EL element 3 is covered with a sealing member 8, and the sealing member 8 is bonded to the glass substrate 2 with an adhesive 9.
The first electrode 5 has an anode terminal portion and a cathode terminal portion (not shown), and is formed such that one end of the cathode terminal portion is electrically connected to the second electrode 7. When the power supply is connected to the anode terminal and the cathode terminal, the light emitting layer emits light, and the light emitting segment S shines.
[0005]
[Problems to be solved by the invention]
However, there is a problem that the insulating film 4 is peeled off from the end portion, and the entire insulating film 4 is peeled off from the glass substrate 2. The problem is that the insulating film 4 is hydrophobic and the glass substrate 2 on which the insulating film 4 is formed is hydrophilic, so that the contact angle α1 at the end of the insulating film 4 is large, It is thought to be caused by the low level of the property. If the insulating film 4 is peeled off, it becomes a defective product, so that the production yield of the organic EL panel 1 is reduced.
[0006]
The present invention has been made in view of this problem, and an object of the present invention is to provide an organic EL panel that can reduce a possibility that an insulating film is separated from a substrate.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an organic EL device 13 having at least a first electrode 15, a light-emitting layer 23, and a second electrode 17, and the first electrode 15 An organic EL panel 11 in which an insulating film 14 for preventing a short circuit of a second electrode 17 is formed on a substrate 12, wherein at least a part 14 a, 14 b, 14 c of an end portion of the insulating film 14 is formed on the substrate 12. A separation preventing portion 32 for preventing the insulating film 14 from being separated from the substrate 12 is provided between them.
[0008]
Further, in the present invention, as described in claim 2, the peeling preventing portion 32 is grounded.
[0009]
Further, according to the present invention, as described in claim 3, the separation preventing portion 32 is more hydrophobic than the substrate 12.
[0010]
Further, in the present invention, as described in claim 4, the separation preventing portion 32 is made of the same material as the first electrode 15.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0012]
The organic EL panel 11 has a glass substrate 12 (substrate), an organic EL element 13, and an insulating film 14. The organic EL element 13 has a first electrode 15 made of ITO, an organic layer 16, and a second electrode 17 made of aluminum, and is formed on the rear surface of the glass substrate 12. The insulating film 14 is formed by baking a patterned photoresist film made of a novolak-based, cyclized rubber-based, acrylic-based, polyimide-based, or chemically amplified resist or the like. The short-circuit of the two electrodes 17 is prevented. Reference numeral 18 denotes a sealing member, which is adhered to the glass substrate 12 with an ultraviolet curing adhesive 19.
[0013]
The organic layer 16 includes a hole injection layer 21, a hole transport layer 22, a light emitting layer 23, and an electron transport layer 24. The organic layer 16 only needs to have at least the light emitting layer 23. The hole injection layer 21, the hole transport layer 22, and the electron transport layer 24 may be omitted, but the provision of the hole injection layer 21, the hole transport layer 22, and the electron transport layer 24 allows the luminance of the organic EL panel 11 to be increased. Can be higher.
[0014]
The first electrode 15 includes a lead portion 28, a display segment portion 29 connected to one end of the lead portion 28, an anode terminal portion 30 and a cathode terminal portion 31 connected to the other end of the lead portion 28, and a peel prevention portion 32. Have. The display segment portions 29 are arranged in a Japanese character shape, and lead portions 28 are connected to the display segment portions 29, respectively. The anode terminal unit 30 and the cathode terminal unit 31 are arranged in a row on one side of the glass substrate 15. The cathode terminal 31 is electrically connected to the second electrode 21, and when the anode terminal 30 and the cathode terminal 31 are connected to a power source, the light emitting segment S emits light. The peel preventing portion 32 has a substantially U shape surrounding the lead portion 28 and the display segment portion 29, and is electrically connected to a ground pattern of a circuit board (not shown).
[0015]
The insulating film 14 has a substantially rectangular shape having ends 14a, 14b, 14c, and 14d, and has an opening 14e corresponding to the light emitting segment S. The separation preventing portion 32 of the first electrode 15 is provided at a position corresponding to the end portions 14a, 14b, 14c of the insulating film 14. The insulating film 14 is formed such that the ends 14 a, 14 b, and 14 c overlap the separation preventing portion 32 of the first electrode 15, and the ends 14 a, 14 b, and 14 c of the insulating film 14 do not contact the glass substrate 12. Since the separation preventing portion 32 (that is, ITO) is more hydrophobic than the glass substrate 15, the contact angle α2 at the end portions 14a, 14b, and 14c of the insulating film 14 is small.
[0016]
According to this embodiment, the wettability of the insulating film 14 is good, the adhesiveness of the insulating film 14 is high, and the possibility that the insulating film 14 is peeled can be reduced. In addition, the grounding of the separation preventing portion 32 can reduce electromagnetic noise generated from the organic EL panel 11.
[0017]
Note that the peel prevention portion 32 is desirably hydrophobic, and may be, for example, chromium (Cr). However, if it is made of the same material as the transparent electrode 15 as in the present embodiment, the display segment portion 29 is used. Also, it can be formed simultaneously with the lead portion 28 and the like, and there is no possibility that the number of steps increases. Further, in the present embodiment, the separation preventing portion 32 is not provided at a position corresponding to the end portion 14d of the insulating film 14, but the separation preventing portion 32 is also provided between each anode terminal portion 30 and the cathode terminal portion 31. It may be provided, and the adhesion of the insulating film 14 can be further improved.
[0018]
In the present embodiment, the segment display type organic EL panel 14 is used. However, the present invention can be applied to a matrix type organic EL panel in which a large number of pixels are arranged in a matrix. Needless to say, the present invention can be applied to an organic EL panel which emits light over substantially the entire surface, such as a backlight of a transmissive display element such as a liquid crystal display element.
[0019]
【The invention's effect】
The present invention provides an organic EL panel in which an organic EL element having at least a first electrode, a light-emitting layer, and a second electrode, and an insulating film that prevents a short circuit between the first electrode and the second electrode are formed on a substrate. Wherein at least a part of an end portion of the insulating film is provided between the substrate and the substrate, a separation preventing portion for preventing the insulating film from being separated from the substrate is provided, and the wettability of the insulating film is improved. Thus, the possibility that the insulating film is separated from the substrate can be reduced.
[0020]
Further, according to the present invention, the peeling prevention section is grounded, so that it is possible to reduce electromagnetic noise generated from the organic EL panel.
[0021]
Further, according to the present invention, the separation preventing portion is more hydrophobic than the substrate, and the possibility that the insulating film is separated from the substrate can be further reduced.
[0022]
Further, in the present invention, the separation preventing portion is made of the same material as the first electrode, and there is no possibility that the number of steps increases.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
FIG. 2 is a front view showing the embodiment.
FIG. 3 is a sectional view showing the embodiment.
FIG. 4 is a sectional view of an organic layer according to the embodiment.
FIG. 5 is a sectional view showing a conventional example.
[Explanation of symbols]
11 Organic EL panel 12 Glass substrate (substrate)
Reference Signs List 13 organic EL element 14 insulating film 14a end 14b end 14c end 15 first electrode 16 organic layer 17 second electrode 32 peeling prevention part

Claims (4)

An organic EL panel in which an organic EL element having at least a first electrode, a light-emitting layer, and a second electrode, and an insulating film that prevents a short circuit between the first electrode and the second electrode are formed on a substrate,
An organic EL panel, comprising: a separation preventing portion provided between at least a part of an end portion of the insulating film and the substrate to prevent the insulating film from being separated from the substrate. The organic EL panel according to claim 1, wherein the peel prevention unit is grounded. The organic EL panel according to claim 1, wherein the separation preventing portion is more hydrophobic than the substrate. 2. The organic EL panel according to claim 1, wherein the separation preventing portion is made of the same material as the first electrode. 3.

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