JP2004296288A - Organic el panel - Google Patents

Organic el panel Download PDF

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Publication number
JP2004296288A
JP2004296288A JP2003087503A JP2003087503A JP2004296288A JP 2004296288 A JP2004296288 A JP 2004296288A JP 2003087503 A JP2003087503 A JP 2003087503A JP 2003087503 A JP2003087503 A JP 2003087503A JP 2004296288 A JP2004296288 A JP 2004296288A
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JP
Japan
Prior art keywords
organic
substrate
sealing member
panel
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003087503A
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Japanese (ja)
Inventor
Naoki Yamazaki
直樹 山崎
Katsuji Yoshikawa
勝司 吉川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Seiki Co Ltd filed Critical Nippon Seiki Co Ltd
Priority to JP2003087503A priority Critical patent/JP2004296288A/en
Publication of JP2004296288A publication Critical patent/JP2004296288A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel wherein an absorbent hardly contacts a layered product when force is applied to sealing glass. <P>SOLUTION: This organic EL panel 9 has: a substrate 10; the layered product 11 having first electrodes 13, a luminescent layer 15a and second electrodes 16 stacked and formed on the substrate 10; a sealing member 12 installed on the substrate 10 through an adhesive G for airtightly covering the luminescent layer 15a; and the absorbent K attached to the sealing member 12. The sealing member 12 is provided with reinforcing parts 12c for preventing the absorbent K from contacting the layered product 11 when stress is applied to the sealing member 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、有機ELパネルに関するものであり、特に、基板に積層形成された少なくとも第一電極と発光層と第二電極とを有する積層体を保護する封止部材を基板に接着した有機ELパネルに関するものである。
【0002】
【従来の技術】
従来より、有機ELパネルが種々提案されており、例えば特許文献1に開示されている。有機ELパネル1は、ガラス基板2上に積層体3を形成したものであり、この積層体3は、第一電極4,絶縁層5,有機層6,第二電極7を有する(図8参照)。第一電極4は、酸化インジウム(In)と酸化スズ(SnO)の混合物であるITO(Indium Tin Oxide)からなるものであり、第二電極7は、アルミニウム(Al)からなるものである。有機層6は正孔注入層,正孔輸送層,発光層及び電子輸送層からなるものであり、第一電極4と第二電極7に挟持されている。
【0003】
【特許文献1】
特開2001−267066号公報
【0004】
第一電極4は、陰極リード部4a,陽極部4b及び陽極リード部4cを有している。第二電極7は、陰極リード部4aに部分的に重なるように形成されており、陰極リード部4aと電気的に導通している。有機ELパネル1は、陽極リード部4c及び陰極リード部4aに電源を接続することにより発光部Pが光輝する。
封止ガラス8は、接着面8aに塗布された接着剤Gによってガラス基板2に接着され、有機層6を覆う気密空間を形成する。有機層6は封止ガラス8によって覆われており、湿気の浸入が防止されている。封止ガラス8には凹部8bが形成されており、この凹部8bにはクリーム状の吸湿剤Kが配設され、気密空間内の湿気が吸収される。
【0005】
【発明が解決しようとする課題】
有機ELパネル1は、FPD(Flat Panel Display)として注目されており、近年、更なる薄型化が求められている。しかしながら、ガラス基板2または封止ガラス8を薄くすると、有機ELパネル1の十分な強度を得ることが困難であり、過度の応力が加わった時には有機ELパネル1が破損する虞があった。本発明の第一の目的は、封止ガラスの強度を向上させることによって薄型化が可能な有機ELパネルを提供することである。
【0006】
また、有機ELパネル1の後面(即ち、封止ガラス8)に、厚さ方向の力Fが加わった時に封止ガラス8が撓み、吸湿剤Kが積層体3に接触して有機層3が劣化し、部分的に発光輝度が低くなったり、発光寿命が短くなったりする虞があった。本発明の第二の目的は、封止ガラスに力が加わったときに吸湿剤が積層体に接触する虞が少ない有機ELパネルを提供することである。
【0007】
【課題を解決するための手段】
本発明は、前記課題を解決するため、請求項1に記載したように、基板10と、前記基板10に積層形成された少なくとも第一電極13と発光層15aと第二電極16とを有する積層体11と、接着剤Gを介して前記基板10上に配設され少なくとも前記発光層15aを気密的に覆う封止部材12,22,32と、を有する有機ELパネルであって、前記封止部材12,22,32に補強部12c,22c,32cを設けたものである。
【0008】
また、本発明は、請求項2に記載したように、基板10と、前記基板10に積層形成された少なくとも第一電極13と発光層15aと第二電極16とを有する積層体11と、接着剤Gを介して前記基板10上に配設され少なくとも前記発光層15aを気密的に覆う封止部材12,22,32と、前記封止部材12,22,32に配設された吸湿剤Kと、を有する有機ELパネルであって、前記封止部材12,22,32に応力が加わったときに前記吸湿剤Kが前記積層体11に接触することを防ぐための補強部12c,22c,32cを前記封止部材12,22,32に設けたものである。
【0009】
また、本発明は、請求項3に記載したように、前記封止部材12,22,32の前記補強部12c,22c,32cは、前記封止部材12,22,32の内側に設けられた梁部であるものである。
【0010】
【発明の実施の形態】
以下、添付した図面に基づいて、本発明の一実施形態を説明する。図1乃至図5は第一実施形態を示す図である。
有機ELパネル9は、ガラス基板10(基板),積層体11,封止ガラス12(封止部材)を有している。積層体11は、ITOからなる第一電極13,ポリイミド系のレジスト材料からなる絶縁層14,有機層15,アルミニウム等の金属からなる第二電極16からなるものであり、ガラス基板10の後面に積層形成されている。有機層15は少なくとも発光層15aを有するものであるが、有機層15に正孔注入層15b,正孔輸送層15c及び電子輸送層15dを設けても良い(図3参照)。
【0011】
図4に示すように、第一電極13は、表示セグメント部18と、表示セグメント部18に連なる陽極リード部19と、第二電極16に電気的に導通する陰極リード部20とを有している。表示セグメント部18は日字形に配設されており、この表示セグメント部18に各々陽極リード部19が連設されている。陽極リード部19はガラス基板10の一辺側に引き回されている。
【0012】
絶縁層14は、発光部Pに対応する箇所を除いて、ガラス基板10の略全範囲に設けられている。Gは紫外線硬化型の接着剤であり、この接着剤Gによりガラス基板10の後面と封止ガラス12の接着面12aとが接着される。封止ガラス12は、成型法等の方法によって形成されたものであり、有機層15を覆う気密空間を形成する凹部12bが設けられている。この凹部12bの中央箇所12dには、クリーム状の吸湿剤Kが直線状に塗布されている。封止ガラス12は、凹部12bの周縁に設けられた枠状の梁部12cを有しており、従来よりも強度が向上している。
【0013】
第一実施形態によれば、封止ガラス12に梁部12cを設けることによって封止ガラス12の強度が向上し、封止ガラス12に応力が加わっても破損する虞が少ない。また、従来と同程度の強度であれば、封止ガラス12を肉薄にすることができ、有機ELパネル9を薄型化することが可能である。また、封止ガラス12に、厚さ方向の力が加わったときでも、封止ガラス12の撓みが少なく、吸湿剤Kが積層体11に接触する虞が小さい。
【0014】
なお、第一実施形態は、凹部12bの周縁に梁部12cを設けたものであったが、図6に示す第二実施形態のように、封止ガラス22の中央部に梁部22cを設けて、この梁部22cの両側に吸湿剤Kを塗布しても良く、第一実施形態と同様な効果を得ることができる。また、図7に示す第三実施形態のように、封止ガラス32の外側面に梁部32cを設けても良く、封止ガラス32の強度が従来よりも向上するが、有機ELパネルを薄型化するためには、第一,第二実施形態のように封止ガラス12,22の内側に梁部12c,22cを設けることが望ましい。
【0015】
【発明の効果】
本発明は、基板と、前記基板に積層形成された少なくとも第一電極と発光層と第二電極とを有する積層体と、接着剤を介して前記基板上に配設され少なくとも前記発光層を気密的に覆う封止部材と、を有する有機ELパネルであって、前記封止部材に補強部を設けたものであり、封止部材の強度が向上し、薄型化が可能になる。
【0016】
また、本発明は、基板と、前記基板に積層形成された少なくとも第一電極と発光層と第二電極とを有する積層体と、接着剤を介して前記基板上に配設され少なくとも前記発光層を気密的に覆う封止部材と、前記封止部材に配設された吸湿剤と、を有する有機ELパネルであって、前記封止部材に応力が加わったときに前記吸湿剤が前記積層体に接触することを防ぐための補強部を前記封止部材に設けたものであり、封止部材に力が加わったときに吸湿剤が積層体に接触する虞が少ない。
【図面の簡単な説明】
【図1】本発明の第一実施形態を示す断面図。
【図2】同上実施形態を示す正面図。
【図3】同上実施形態を示す有機層の拡大断面図。
【図4】同上実施形態を示す分解斜視図。
【図5】同上実施形態を示す封止ガラスの斜視図。
【図6】本発明の第二実施形態を示す断面図。
【図7】本発明の第三実施形態を示す断面図。
【図8】従来例を示す断面図。
【符号の説明】
9 有機ELパネル
10 ガラス基板(基板)
11 積層体
12 封止ガラス(封止部材)
12c 梁部(補強部)
13 第一電極
15 有機層
15a 発光層
16 第二電極
22 封止ガラス(封止部材)
22c 梁部(補強部)
32 封止ガラス(封止部材)
32c 梁部(補強部)
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic EL panel, and more particularly, to an organic EL panel in which a sealing member for protecting a laminate having at least a first electrode, a light emitting layer, and a second electrode laminated on a substrate is bonded to the substrate. It is about.
[0002]
[Prior art]
Conventionally, various organic EL panels have been proposed, for example, disclosed in Patent Document 1. The organic EL panel 1 is obtained by forming a laminate 3 on a glass substrate 2, and the laminate 3 has a first electrode 4, an insulating layer 5, an organic layer 6, and a second electrode 7 (see FIG. 8). ). The first electrode 4 is made of ITO (Indium Tin Oxide), which is a mixture of indium oxide (In 2 O 3 ) and tin oxide (SnO 2 ), and the second electrode 7 is made of aluminum (Al). It is. 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 4 and the second electrode 7.
[0003]
[Patent Document 1]
JP 2001-267066 A
The first electrode 4 has a cathode lead 4a, an anode 4b, and an anode lead 4c. The second electrode 7 is formed so as to partially overlap the cathode lead 4a, and is electrically connected to the cathode lead 4a. In the organic EL panel 1, the light emitting section P shines by connecting a power supply to the anode lead section 4c and the cathode lead section 4a.
The sealing glass 8 is bonded to the glass substrate 2 by the adhesive G applied to the bonding surface 8a, and forms an airtight space covering the organic layer 6. The organic layer 6 is covered with the sealing glass 8 to prevent moisture from entering. A concave portion 8b is formed in the sealing glass 8, and a creamy absorbent K is disposed in the concave portion 8b to absorb moisture in the airtight space.
[0005]
[Problems to be solved by the invention]
The organic EL panel 1 has attracted attention as a flat panel display (FPD), and in recent years, further reduction in thickness has been demanded. However, when the glass substrate 2 or the sealing glass 8 is thin, it is difficult to obtain a sufficient strength of the organic EL panel 1, and there is a possibility that the organic EL panel 1 may be damaged when an excessive stress is applied. A first object of the present invention is to provide an organic EL panel that can be made thinner by improving the strength of sealing glass.
[0006]
Further, when a force F in the thickness direction is applied to the rear surface (that is, the sealing glass 8) of the organic EL panel 1, the sealing glass 8 bends, and the hygroscopic agent K comes into contact with the laminate 3 to form the organic layer 3. There is a possibility that the light emission luminance deteriorates, the light emission luminance is partially reduced, or the light emission life is shortened. A second object of the present invention is to provide an organic EL panel in which there is little possibility that the moisture absorbent contacts the laminate when a force is applied to the sealing glass.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a laminated structure including a substrate 10, and at least a first electrode 13, a light emitting layer 15a, and a second electrode 16 laminated on the substrate 10, as described in claim 1. An organic EL panel comprising: a body 11; and sealing members 12, 22, and 32 disposed on the substrate 10 via an adhesive G to hermetically cover at least the light emitting layer 15a. The members 12, 22, 32 are provided with reinforcing portions 12c, 22c, 32c.
[0008]
Further, according to the present invention, as described in claim 2, the substrate 10 and the laminate 11 having at least the first electrode 13, the light emitting layer 15a, and the second electrode 16 laminated on the substrate 10 are bonded. Sealing members 12, 22, 32, which are disposed on the substrate 10 via the agent G and hermetically cover at least the light emitting layer 15a, and a desiccant K, which is disposed on the sealing members 12, 22, 32, And a reinforcing portion 12c, 22c, for preventing the desiccant K from coming into contact with the laminated body 11 when stress is applied to the sealing members 12, 22, 32. 32c is provided on the sealing members 12, 22, 32.
[0009]
In the present invention, the reinforcing portions 12c, 22c, 32c of the sealing members 12, 22, 32 are provided inside the sealing members 12, 22, 32, respectively. It is a beam part.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 5 are views showing a first embodiment.
The organic EL panel 9 has a glass substrate 10 (substrate), a laminated body 11, and a sealing glass 12 (sealing member). The laminate 11 includes a first electrode 13 made of ITO, an insulating layer 14 made of a polyimide-based resist material, an organic layer 15, and a second electrode 16 made of a metal such as aluminum. It is formed by lamination. Although the organic layer 15 has at least the light emitting layer 15a, the organic layer 15 may be provided with a hole injection layer 15b, a hole transport layer 15c, and an electron transport layer 15d (see FIG. 3).
[0011]
As shown in FIG. 4, the first electrode 13 includes a display segment 18, an anode lead 19 connected to the display segment 18, and a cathode lead 20 electrically connected to the second electrode 16. I have. The display segments 18 are arranged in a Japanese character shape, and each of the display segments 18 is connected to an anode lead 19. The anode lead portion 19 is routed to one side of the glass substrate 10.
[0012]
The insulating layer 14 is provided over substantially the entire area of the glass substrate 10 except for a portion corresponding to the light emitting unit P. G is a UV-curable adhesive, and the adhesive G bonds the rear surface of the glass substrate 10 to the bonding surface 12a of the sealing glass 12. The sealing glass 12 is formed by a method such as a molding method, and has a concave portion 12b that forms an airtight space that covers the organic layer 15. A cream-like hygroscopic agent K is linearly applied to a central portion 12d of the concave portion 12b. The sealing glass 12 has a frame-shaped beam portion 12c provided on the periphery of the concave portion 12b, and the strength is improved as compared with the related art.
[0013]
According to the first embodiment, by providing the beam portion 12c in the sealing glass 12, the strength of the sealing glass 12 is improved, and even if stress is applied to the sealing glass 12, there is little possibility of breakage. Further, if the strength is almost the same as the conventional one, the sealing glass 12 can be made thinner, and the organic EL panel 9 can be made thinner. Further, even when a force in the thickness direction is applied to the sealing glass 12, the bending of the sealing glass 12 is small, and the possibility that the moisture absorbent K contacts the laminated body 11 is small.
[0014]
In the first embodiment, the beam portion 12c is provided at the periphery of the concave portion 12b. However, as in the second embodiment shown in FIG. 6, the beam portion 22c is provided at the center of the sealing glass 22. Thus, the moisture absorbent K may be applied to both sides of the beam 22c, and the same effect as in the first embodiment can be obtained. Further, as in the third embodiment shown in FIG. 7, a beam portion 32c may be provided on the outer surface of the sealing glass 32, and the strength of the sealing glass 32 is improved as compared with the conventional case. In order to achieve this, it is desirable to provide the beam portions 12c and 22c inside the sealing glasses 12 and 22 as in the first and second embodiments.
[0015]
【The invention's effect】
The present invention provides a substrate, a laminate having at least a first electrode, a light-emitting layer, and a second electrode laminated on the substrate, and hermetically sealing at least the light-emitting layer disposed on the substrate via an adhesive. An organic EL panel having a sealing member which covers the sealing member, wherein the sealing member is provided with a reinforcing portion, whereby the strength of the sealing member is improved and the thickness can be reduced.
[0016]
The present invention also provides a substrate, a laminate having at least a first electrode, a light-emitting layer, and a second electrode laminated on the substrate, and at least the light-emitting layer disposed on the substrate via an adhesive. An organic EL panel having a sealing member that hermetically covers the sealing member, and a moisture absorbing agent disposed on the sealing member, wherein the moisture absorbing agent is applied to the laminate when stress is applied to the sealing member. The sealing member is provided with a reinforcing portion for preventing the sealing member from contacting the sealing member, and there is little possibility that the hygroscopic agent contacts the laminate when a force is applied to the sealing member.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first embodiment of the present invention.
FIG. 2 is a front view showing the embodiment.
FIG. 3 is an enlarged sectional view of an organic layer according to the embodiment.
FIG. 4 is an exploded perspective view showing the embodiment.
FIG. 5 is a perspective view of a sealing glass showing the embodiment.
FIG. 6 is a sectional view showing a second embodiment of the present invention.
FIG. 7 is a sectional view showing a third embodiment of the present invention.
FIG. 8 is a sectional view showing a conventional example.
[Explanation of symbols]
9 Organic EL panel 10 Glass substrate (substrate)
11 laminated body 12 sealing glass (sealing member)
12c Beam (reinforcement)
13 First electrode 15 Organic layer 15a Light emitting layer 16 Second electrode 22 Sealing glass (sealing member)
22c Beam (reinforcement)
32 Sealing glass (sealing member)
32c Beam (reinforcement)

Claims (3)

基板と、前記基板に積層形成された少なくとも第一電極と発光層と第二電極とを有する積層体と、接着剤を介して前記基板上に配設され少なくとも前記発光層を気密的に覆う封止部材と、を有する有機ELパネルであって、前記封止部材に補強部を設けたことを特徴とする有機ELパネル。A substrate, a laminate having at least a first electrode, a light-emitting layer, and a second electrode laminated on the substrate; and a seal disposed on the substrate via an adhesive to cover at least the light-emitting layer in an airtight manner. An organic EL panel comprising: a stopper; and a reinforcing member provided in the sealing member. 基板と、前記基板に積層形成された少なくとも第一電極と発光層と第二電極とを有する積層体と、接着剤を介して前記基板上に配設され少なくとも前記発光層を気密的に覆う封止部材と、前記封止部材に配設された吸湿剤と、を有する有機ELパネルであって、
前記封止部材に応力が加わったときに前記吸湿剤が前記積層体に接触することを防ぐための補強部を前記封止部材に設けたことを特徴とする有機ELパネル。
A substrate, a laminate having at least a first electrode, a light-emitting layer, and a second electrode laminated on the substrate; and a seal disposed on the substrate via an adhesive to cover at least the light-emitting layer in an airtight manner. An organic EL panel having a stop member and a moisture absorbent disposed on the sealing member,
An organic EL panel, wherein a reinforcing portion for preventing the hygroscopic agent from contacting the laminate when a stress is applied to the sealing member is provided on the sealing member.
前記封止部材の前記補強部は、前記封止部材の内側に設けられた梁部であることを特徴とする請求項1または請求項2に記載の有機ELパネル。The organic EL panel according to claim 1, wherein the reinforcing portion of the sealing member is a beam portion provided inside the sealing member.
JP2003087503A 2003-03-27 2003-03-27 Organic el panel Pending JP2004296288A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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JP2006252989A (en) * 2005-03-11 2006-09-21 Seiko Epson Corp Display panel, mobile display module and electronics using this
WO2014010221A1 (en) * 2012-07-11 2014-01-16 パナソニック株式会社 Organic electroluminescent element and lighting apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006252989A (en) * 2005-03-11 2006-09-21 Seiko Epson Corp Display panel, mobile display module and electronics using this
US7705535B2 (en) 2005-03-11 2010-04-27 Seiko Epson Corporation Display panel, display module for mobile using display panel, and electronic apparatus
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