JP3672078B2

JP3672078B2 - EL display device

Info

Publication number: JP3672078B2
Application number: JP2000081760A
Authority: JP
Inventors: 仁資若井
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2000-03-17
Filing date: 2000-03-17
Publication date: 2005-07-13
Anticipated expiration: 2020-03-17
Also published as: JP2001267066A

Description

【０００１】
【発明の属する技術分野】
本発明は、電界発光表示素子（ＥＬ）に関するものである。
【０００２】
【従来の技術】
従来より、図５に示す有機電界発光表示素子（以下、有機ＥＬと記す）がある。有機ＥＬはガラス基板１に積層体２を形成したものであり、この積層体２は透明電極３，有機層４，背面電極５を有する。有機層４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る。積層体２は封止ガラス６に覆われており、この封止ガラス６の接着面６ａはガラス基板１に接着剤７により接着されている。透明電極３と背面電極５の間には、短絡を防ぐため、発光セグメント８を除いて、絶縁層９が形成されている。ガラス基板２と封止ガラス７の間には吸湿剤Ａが充填されており、有機層４が水分に触れて劣化することを防止している。
【０００３】
【発明が解決しようとする課題】
しかしながら、極めて稀ではあるが、吸湿剤Ａの中に異物Ｂが混入していることがあり、この異物Ｂによって透明電極３と背面電極５が導通してしまい短絡する虞があった。透明電極３と背面電極５が短絡してしまうと、透明電極３と背面電極５に電圧を印加しても、発光層が発光しないため、その電界発光表示素子は不良品となる。そのため、若干ではあるが、歩留りが低下するという問題を有していた。
本発明は、この問題に鑑みなされたものであり、ガラス基板と封止ガラスの間に異物が混入しても透明電極と背面電極が短絡する虞がない電界発光表示素子を提供するものである。
【０００４】
【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、基板と、前記基板に積層された透明電極と発光層と背面電極とを有する積層体と、接着剤により前記基板に接着される接着面と少なくとも前記発光層を覆う凹部とを備えた封止部材と、を有する電界発光表示素子であって、前記積層体は、前記背面電極を前記透明電極と絶縁し短絡を防ぐ絶縁層を有し、前記絶縁層は、前記接着面と正面視で一部が重なるように形成されているものである。
【０００５】
また、本発明は、基板と、前記基板に積層された透明電極と発光層と背面電極とを有する積層体と、接着剤により前記基板に接着される接着面と少なくとも前記発光層を覆う凹部とを備えた封止部材と、を有する電界発光表示素子であって、前記積層体の前記透明電極は、リード部と、前記リード部の一端と連なる表示セグメント部と、前記リード部の他端と連なる陽極端子部と、前記背面電極に導通される陰極端子部と、を有すると共に、前記積層体は、前記背面電極を前記透明電極と絶縁し短絡を防ぐ絶縁層を有し、前記絶縁層は、前記接着面と正面視で一部が重なるように形成されているものである。
【０００６】
また、本発明は、前記背面電極は、前記接着面と正面視で一部が重なるように形成されているものである。
【０００７】
また、本発明は、前記基板と前記封止部材の間に充填された吸湿剤を有するものである。
【０００８】
【発明の実施の形態】
電界発光表示素子は、基板１０に積層体１１を形成し、この積層体１１を覆う凹部１２ｂを有する封止部材１２を基板１０に接着したものである。積層体１１は、透明電極１３，絶縁層１４，有機層１５，背面電極１６を有する。有機層１５は、少なくとも発光層があれば良いが、正孔注入層，正孔輸送層及び電子輸送層を設けても良い。絶縁層１４は、封止部材１２の凹部１２ｂよりも広範囲に形成されており、封止部材１２の接着面１２ａと正面視で一部重なる。
【０００９】
【実施例】
以下、添付の図面に基づいて、本発明の一実施例を説明する。有機ＥＬ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（Indium Tin Oxide）からなる透明電極１３，絶縁層１４，有機層１５，アルミニウム等の金属からなる背面電極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を有するものであるが、有機層１５に正孔注入層，正孔輸送層及び電子輸送層を設けても良い。
【００１０】
図４に示すように、透明電極１３は、リード部１７と、リード部１７の一端と連なる表示セグメント部１８と、リード部１７の他端と連なる陽極端子部１９と、陰極端子部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に各々リード部１７が連設されている。リード部１７はガラス基板１０の一辺側に引き回されており、陽極端子部１９が連設されている。陽極端子部１９及び陰極端子部２０はガラス基板１０の一辺側に列状に配置されている。
【００１１】
透明電極１３のリード部１７及び表示セグメント部１８は、絶縁層１４により背面電極１６と絶縁されている。絶縁層１４は、透明電極１３の表示セグメント部１８の周縁部と若干重なるように形成されており、発光セグメント２１に対応する箇所及び各端子部１９，２０の近傍を除いて、ガラス基板１０の略全範囲に設けられている。絶縁層１４には矩形の切欠き部１４ａが設けられており、この切欠き部１４ａで陰極端子部２０に連設されたリード部２２が背面電極１６と導通される。
【００１２】
２３は紫外線硬化型の接着剤であり、この接着剤２３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には積層体１１を覆う凹部１２ｂが形成されており、この凹部１２ｂを除く封止ガラス１２の前面が接着面１２ａとなっている。Ａは吸湿剤であり、この吸湿剤Ａは封止ガラス１２の注入口（図示しない）から注入され、凹部１２ｂに充填されている。
絶縁層１４は、凹部１２ｂよりも広い範囲に形成されており、正面視で接着面１２ａと幅Ｗだけ重なっている。また、背面電極１６も、凹部１２ｂよりも広い範囲に形成されている。背面電極１６は、透明電極１３のリード部１７が背面電極１６に短絡しないように、絶縁層１４の外延よりも若干狭くなっている。
【００１３】
絶縁層１４はガラス基板１０の後面の略全範囲に形成されており、仮に、ガラス基板１０と封止ガラス１２の間に異物が混入したとしても、透明電極１３と背面電極１６が短絡する虞がない。従って、透明電極１３と背面電極１６の短絡が原因で不良品となることがなく、歩留りの向上が期待できる。
背面電極１６は、少なくとも発光セグメント２１に対応する箇所に形成されていれば良いが、ガラス基板１０，透明電極１３，絶縁層１４及び有機層１５が略透明であるのに対し、背面電極１６はアルミニウム等の金属からなるものであり、鏡面となって見えるため、背面電極１６をガラス基板１０の一部ではなく、略全範囲に形成し、電界発光表示素子の前面が略一様な外観にすることが望ましい。
【００１４】
【発明の効果】
本発明は、基板と、前記基板に積層された透明電極と発光層と背面電極とを有する積層体と、接着剤により前記基板に接着される接着面と少なくとも前記発光層を覆う凹部とを備えた封止部材と、を有する電界発光表示素子であって、前記積層体は、前記背面電極を前記透明電極と絶縁し短絡を防ぐ絶縁層を有し、前記絶縁層は、前記接着面と正面視で一部が重なるように形成されているものであり、基板と封止部材の間に異物が混入しても透明電極と背面電極が短絡する虞がない。
【００１５】
また、本発明は、基板と、前記基板に積層された透明電極と発光層と背面電極とを有する積層体と、接着剤により前記基板に接着される接着面と少なくとも前記発光層を覆う凹部とを備えた封止部材と、を有する電界発光表示素子であって、前記積層体の前記透明電極は、リード部と、前記リード部の一端と連なる表示セグメント部と、前記リード部の他端と連なる陽極端子部と、前記背面電極に導通される陰極端子部と、を有すると共に、前記積層体は、前記背面電極を前記透明電極と絶縁し短絡を防ぐ絶縁層を有し、前記絶縁層は、前記接着面と正面視で一部が重なるように形成されているものであり、基板と封止部材の間に異物が混入しても透明電極と背面電極が短絡する虞がない。
【図面の簡単な説明】
【図１】本発明の実施例を示す要部断面図。
【図２】同上実施例を示す断面図。
【図３】同上実施例を示す正面図。
【図４】同上実施例を示す分解斜視図。
【図５】従来例を示す断面図。
【符号の説明】
９有機ＥＬ（電界発光表示素子）
１０ガラス基板（基板）
１１積層体
１２封止ガラス（封止部材）
１２ａ接着面
１３透明電極
１４絶縁層
１５有機層
１６背面電極
２３接着剤[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electroluminescent display element (EL).
[0002]
[Prior art]
Conventionally, there is an organic electroluminescence display element (hereinafter referred to as organic EL) shown in FIG. The organic EL is obtained by forming a laminate 2 on a glass substrate 1, and this laminate 2 has a transparent electrode 3, an organic layer 4, and a back electrode 5. The organic layer 4 is composed of a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer. The laminate 2 is covered with a sealing glass 6, and the adhesive surface 6 a of the sealing glass 6 is bonded to the glass substrate 1 with an adhesive 7. An insulating layer 9 is formed between the transparent electrode 3 and the back electrode 5 except for the light emitting segment 8 in order to prevent a short circuit. A hygroscopic agent A is filled between the glass substrate 2 and the sealing glass 7 to prevent the organic layer 4 from deteriorating due to moisture.
[0003]
[Problems to be solved by the invention]
However, although it is extremely rare, foreign matter B may be mixed in the hygroscopic agent A, and the transparent electrode 3 and the back electrode 5 may be electrically connected by the foreign matter B to cause a short circuit. If the transparent electrode 3 and the back electrode 5 are short-circuited, even if a voltage is applied to the transparent electrode 3 and the back electrode 5, the light emitting layer does not emit light, so that the electroluminescent display element becomes a defective product. For this reason, there is a problem that the yield is lowered, although it is slightly.
The present invention has been made in view of this problem, and provides an electroluminescent display element in which a transparent electrode and a back electrode are not short-circuited even if foreign matter is mixed between a glass substrate and a sealing glass. .
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a substrate, a laminate having a transparent electrode, a light emitting layer, and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate by an adhesive, and at least the light emission. a light emitting display device having a sealing member that includes a recess for covering the layer, and the laminate has an insulating layer to prevent the insulating and transparent electrode shorted said back electrode, said insulating layer Is formed so as to partially overlap the adhesive surface in front view.
[0005]
The present invention also includes a substrate, a laminate having a transparent electrode, a light emitting layer and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate with an adhesive, and a recess covering at least the light emitting layer. The transparent electrode of the multilayer body includes a lead portion, a display segment portion connected to one end of the lead portion, and the other end of the lead portion. an anode terminal portion continuous, and the cathode terminal portion to be electrically connected to the back electrode, and having a, the laminate has an insulating layer to prevent the insulating and transparent electrode shorted said back electrode, said insulating layer The adhesive surface is formed so as to partially overlap with the front view.
[0006]
In the present invention, the back electrode is formed so as to partially overlap the adhesive surface in a front view.
[0007]
Moreover, this invention has a hygroscopic agent with which it filled between the said board | substrate and the said sealing member.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the electroluminescent display element, a laminate 11 is formed on a substrate 10, and a sealing member 12 having a recess 12 b covering the laminate 11 is bonded to the substrate 10. The laminate 11 includes a transparent electrode 13, an insulating layer 14, an organic layer 15, and a back electrode 16. The organic layer 15 may have at least a light emitting layer, but may be provided with a hole injection layer, a hole transport layer, and an electron transport layer. The insulating layer 14 is formed in a wider range than the recess 12 b of the sealing member 12, and partially overlaps the adhesive surface 12 a of the sealing member 12 in front view.
[0009]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The organic EL has a glass substrate 10 (substrate), a laminate 11, and a sealing glass 12 (sealing member). The laminate 11 includes a transparent electrode 13 made of ITO (Indium Tin Oxide), an insulating layer 14, an organic layer 15, and a back electrode 16 made of a metal such as aluminum, and is laminated on the rear surface of the glass substrate 10. Yes. The organic layer 15 has at least a light emitting layer, but a hole injection layer, a hole transport layer, and an electron transport layer may be provided in the organic layer 15.
[0010]
As shown in FIG. 4, the transparent electrode 13 includes a lead portion 17, a display segment portion 18 connected to one end of the lead portion 17, an anode terminal portion 19 connected to the other end of the lead portion 17, and a cathode terminal portion 20. Have. The display segment portions 18 are arranged in a Japanese character shape, and lead portions 17 are connected to the display segment portions 18 respectively. The lead portion 17 is routed to one side of the glass substrate 10, and an anode terminal portion 19 is continuously provided. The anode terminal portion 19 and the cathode terminal portion 20 are arranged in a row on one side of the glass substrate 10.
[0011]
The lead portion 17 and the display segment portion 18 of the transparent electrode 13 are insulated from the back electrode 16 by the insulating layer 14. The insulating layer 14 is formed so as to slightly overlap with the peripheral edge of the display segment portion 18 of the transparent electrode 13, except for the portion corresponding to the light emitting segment 21 and the vicinity of the terminal portions 19 and 20. It is provided in almost the entire range. The insulating layer 14 is provided with a rectangular cutout portion 14 a, and the lead portion 22 connected to the cathode terminal portion 20 is electrically connected to the back electrode 16 through the cutout portion 14 a.
[0012]
Reference numeral 23 denotes an ultraviolet curable adhesive, and the rear surface of the glass substrate 10 and the adhesive surface 12 a of the sealing glass 12 are bonded by the adhesive 23. The sealing glass 12 has a recess 12b that covers the laminate 11, and the front surface of the sealing glass 12 excluding the recess 12b serves as an adhesive surface 12a. A is a hygroscopic agent, and this hygroscopic agent A is injected from an injection port (not shown) of the sealing glass 12 and filled in the recess 12b.
The insulating layer 14 is formed in a wider range than the recess 12b, and overlaps the adhesive surface 12a and the width W in a front view. The back electrode 16 is also formed in a wider range than the recess 12b. The back electrode 16 is slightly narrower than the extension of the insulating layer 14 so that the lead portion 17 of the transparent electrode 13 is not short-circuited to the back electrode 16.
[0013]
The insulating layer 14 is formed in substantially the entire range of the rear surface of the glass substrate 10, and even if foreign matter enters between the glass substrate 10 and the sealing glass 12, the transparent electrode 13 and the back electrode 16 may be short-circuited. There is no. Therefore, it does not become a defective product due to a short circuit between the transparent electrode 13 and the back electrode 16, and an improvement in yield can be expected.
The back electrode 16 only needs to be formed at least at a location corresponding to the light emitting segment 21, whereas the glass substrate 10, the transparent electrode 13, the insulating layer 14, and the organic layer 15 are substantially transparent, whereas the back electrode 16 Since it is made of a metal such as aluminum and appears to be a mirror surface, the back electrode 16 is formed not in a part of the glass substrate 10 but in substantially the entire range, and the front surface of the electroluminescent display element has a substantially uniform appearance. It is desirable to do.
[0014]
【The invention's effect】
The present invention includes a substrate, a laminate having a transparent electrode, a light emitting layer, and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate with an adhesive, and a recess covering at least the light emitting layer. and a sealing member, a light emitting display device having the laminate, the back electrode an insulating layer to prevent the insulating and transparent electrodes shorted, the insulating layer, the adhesive surface and the front They are formed so as to partially overlap each other, and even if foreign matter enters between the substrate and the sealing member, there is no possibility that the transparent electrode and the back electrode are short-circuited.
[0015]
The present invention also includes a substrate, a laminate having a transparent electrode, a light emitting layer and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate with an adhesive, and a recess covering at least the light emitting layer. The transparent electrode of the multilayer body includes a lead portion, a display segment portion connected to one end of the lead portion, and the other end of the lead portion. an anode terminal portion continuous, and the cathode terminal portion to be electrically connected to the back electrode, and having a, the laminate has an insulating layer to prevent the insulating and transparent electrode shorted said back electrode, said insulating layer It is formed so as to partially overlap the adhesive surface in front view, and there is no possibility that the transparent electrode and the back electrode are short-circuited even if foreign matter is mixed between the substrate and the sealing member.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention.
FIG. 2 is a sectional view showing the embodiment.
FIG. 3 is a front view showing the embodiment.
FIG. 4 is an exploded perspective view showing the embodiment.
FIG. 5 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
9 Organic EL (electroluminescent display element)
10 Glass substrate (substrate)
11 Laminated body 12 Sealing glass (sealing member)
12a Adhesive surface 13 Transparent electrode 14 Insulating layer 15 Organic layer 16 Back electrode 23 Adhesive

Claims

A sealing member comprising a substrate, a laminate having a transparent electrode, a light emitting layer and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate with an adhesive, and a recess covering at least the light emitting layer And an electroluminescent display element comprising:
The laminate, the rear electrode is insulated from the transparent electrode has an insulating layer for preventing a short circuit, the insulating layer, and characterized in that it is formed so as to partially overlap with the adhesive surface and the front view An electroluminescent display element.

A sealing member comprising a substrate, a laminate having a transparent electrode, a light emitting layer and a back electrode laminated on the substrate, an adhesive surface bonded to the substrate with an adhesive, and a recess covering at least the light emitting layer And an electroluminescent display element comprising:
The transparent electrode of the laminate includes a lead part, a display segment part connected to one end of the lead part, an anode terminal part connected to the other end of the lead part, a cathode terminal part connected to the back electrode, And having
The laminate, the rear electrode is insulated from the transparent electrode has an insulating layer for preventing a short circuit, the insulating layer, and characterized in that it is formed so as to partially overlap with the adhesive surface and the front view An electroluminescent display element.

The electroluminescent display device according to claim 1, wherein the back electrode is formed so as to partially overlap the adhesive surface in a front view.

The electroluminescent display element according to claim 1, further comprising a hygroscopic agent filled between the substrate and the sealing member.