JPH1187052A - Organic electroluminescence element - Google Patents
Organic electroluminescence elementInfo
- Publication number
- JPH1187052A JPH1187052A JP9282472A JP28247297A JPH1187052A JP H1187052 A JPH1187052 A JP H1187052A JP 9282472 A JP9282472 A JP 9282472A JP 28247297 A JP28247297 A JP 28247297A JP H1187052 A JPH1187052 A JP H1187052A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- anode
- substrate
- organic
- extraction 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
Links
- 238000005401 electroluminescence Methods 0.000 title claims description 11
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 230000005525 hole transport Effects 0.000 claims abstract description 15
- 238000000605 extraction Methods 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 12
- 229910052738 indium Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 35
- 239000004020 conductor Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 125000006617 triphenylamine group Chemical group 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
- H10K59/179—Interconnections, e.g. wiring lines or terminals
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/06—Electrode terminals
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機発光層を備え
た有機エレクトロルミネッセンス素子（以下、有機ＥＬ
素子とも呼ぶ）に関する。特に本発明は、一般に金属の
蒸着によって形成される陰極を有する有機ＥＬ素子に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent device having an organic light emitting layer (hereinafter referred to as an organic EL device).
Element). In particular, the present invention generally relates to an organic EL device having a cathode formed by vapor deposition of a metal.
【０００２】[0002]
【従来の技術】有機ＥＬ素子は、電子注入電極と正孔注
入電極の間に蛍光性有機化合物を含む薄膜を挟んだ構造
を有し、前記薄膜に電子および正孔を注入して再結合さ
せることにより励起子（エキシトン）を生成させ、この
エキシトンが失活する際の光の放出（蛍光・燐光）を利
用して表示を行う表示素子である。2. Description of the Related Art An organic EL device has a structure in which a thin film containing a fluorescent organic compound is sandwiched between an electron injecting electrode and a hole injecting electrode, and electrons and holes are injected into the thin film and recombined. This is a display element that generates excitons (excitons) and emits light (fluorescence / phosphorescence) when the excitons are deactivated.
【０００３】前記有機ＥＬ素子の基本構成の一つを図３
に示した。この有機ＥＬ素子は、ガラス製の基板１００
上の陽極１０１にＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘ
ｉｄｅ）、正孔輸送層１０２としてトリフェニルアミン
誘導体（Ｄｉａｍｉｎｅ）、有機発光層１０３としてト
リス（８−キノリライト）アルミニウム（ＩＩＩ）（Ａ
ｌｑ３）、陰極１０４としてマグネシウムと銀の合金を
使用している。有機の各層の厚みは５０ｎｍ程度であ
る。各層の成膜は真空蒸着で行っている。この有機ＥＬ
素子において、陰極１０４と陽極１０１の間に１０Ｖの
直流電圧を加えると、１０００ｃｄ／ｍ２程度の緑色の
発光が得られる。One of the basic structures of the organic EL device is shown in FIG.
It was shown to. This organic EL element is made of a glass substrate 100.
The upper anode 101 is provided with ITO (Indium Tin Ox).
ide), a triphenylamine derivative (Diamine) as the hole transport layer 102, and tris (8-quinolilite) aluminum (III) (A) as the organic light emitting layer 103.
lq 3 ), and an alloy of magnesium and silver is used as the cathode 104. The thickness of each organic layer is about 50 nm. Each layer is formed by vacuum evaporation. This organic EL
In the element, when a DC voltage of 10 V is applied between the cathode 104 and the anode 101, green light emission of about 1000 cd / m 2 is obtained.
【０００４】前記有機ＥＬ素子においては、陰極の素材
として仕事関数の小さい金属材料（例えばＬｉ、Ｎａ、
Ｍｇ、Ｃａ等）を単体として使用し、又はＡｌ：Ｌｉ、
Ｍｇ：Ｉｎ、Ｍｇ：Ａｇ等の合金として使用している。
前述した基本構造の有機ＥＬ素子においては、陽極１０
１と陰極１０４を外部の駆動回路に接続するために、陰
極１０４を基板１００上に引き出しておく必要がある。
ところが、陰極に使用している仕事関数の小さな金属材
料は活性が高いので酸化しやすく、このため外部回路と
の接続を行う端子部分に使用すると酸化による剥離、変
質、高抵抗化が起こりやすい。In the organic EL device, a metal material having a small work function (eg, Li, Na,
Mg, Ca, etc.) as a simple substance, or Al: Li,
It is used as an alloy such as Mg: In and Mg: Ag.
In the organic EL device having the basic structure described above, the anode 10
In order to connect the cathode 1 and the cathode 104 to an external driving circuit, the cathode 104 needs to be drawn out onto the substrate 100.
However, a metal material having a small work function used for the cathode has a high activity and is easily oxidized. Therefore, when used for a terminal portion for connection to an external circuit, peeling, deterioration, and high resistance due to oxidation are likely to occur.
【０００５】また、陰極としての膜厚は２００ｎｍ以下
でよいが、端子として使用する場合には機械的強度が不
十分となり、キズによる断線や接触不良が発生すること
があった。[0005] The thickness of the cathode may be 200 nm or less, but when used as a terminal, the mechanical strength becomes insufficient and disconnection or poor contact may occur due to scratches.
【０００６】これらの事情から、従来の有機ＥＬ素子に
おいては陰極金属をそのまま外部回路との接続端子とし
て使用することは困難であった。For these reasons, it has been difficult to use the cathode metal as it is as a connection terminal with an external circuit in the conventional organic EL device.
【０００７】図４は、特開平３−２７４６９４号に記載
された有機ＥＬ素子の断面図であり、この有機ＥＬは陽
極が設けられた基板１００上に陰極１０４を取り出す構
造を有している。図４において、前述した有機ＥＬ素子
の基本構造に相当する部分には図３と同一の符号を付し
て説明を省略する。図４においては、基板１００上に陰
極１０４の取り出し電極１０５が形成されており、陽極
１０１と取り出し電極１０５の一部を覆って絶縁層１０
６が形成されている。絶縁層１０６の一部には、発光を
取り出すための開口１０７と、取り出し電極１０５と陰
極１０４を接続するためのスルーホール１０８が形成さ
れている。陰極１０４は、このスルーホール１０８にま
で延設されて前記取り出し電極１０５と接続されてい
る。FIG. 4 is a cross-sectional view of an organic EL device described in Japanese Patent Application Laid-Open No. 3-274694. This organic EL has a structure in which a cathode 104 is taken out on a substrate 100 provided with an anode. 4, portions corresponding to the basic structure of the organic EL element described above are denoted by the same reference numerals as in FIG. 3, and description thereof will be omitted. In FIG. 4, an extraction electrode 105 for a cathode 104 is formed on a substrate 100, and the insulating layer 10 covers a part of the anode 101 and the extraction electrode 105.
6 are formed. An opening 107 for extracting light emission and a through hole 108 for connecting the extraction electrode 105 and the cathode 104 are formed in a part of the insulating layer 106. The cathode 104 extends to the through hole 108 and is connected to the extraction electrode 105.
【０００８】[0008]
【発明が解決しようとする課題】図４に示したように、
有機ＥＬ素子の陰極１０４と取り出し電極１０５をスル
ーホール１０８を介して接続する構造によれば、微細な
ピッチで形成された多数の陰極を有する有機ＥＬ素子、
例えばストライプ状の陽極と陰極を交差させてマトリク
スを構成したグラフィックタイプの有機ＥＬの場合等に
は、次のような問題が生じた。即ち、このような有機Ｅ
Ｌの場合には、各陰極に対応する微細なピッチで多数の
スルーホールを形成し、各スルーホールを介して対応す
る取り出し電極と接続しなければならないが、グラフィ
ックタイプの有機ＥＬに要求される陰極のピッチはかな
り微細であり、絶縁層にそのような微細なピッチでスル
ーホールを形成することは技術的に困難であった。As shown in FIG.
According to the structure in which the cathode 104 of the organic EL element and the extraction electrode 105 are connected via the through hole 108, the organic EL element having a large number of cathodes formed at a fine pitch,
For example, in the case of a graphic type organic EL in which a matrix is formed by intersecting a striped anode and a cathode, the following problem occurs. That is, such organic E
In the case of L, a large number of through holes must be formed at a fine pitch corresponding to each cathode and connected to the corresponding extraction electrode via each through hole, which is required for a graphic type organic EL. The pitch of the cathode is quite fine, and it has been technically difficult to form through holes at such a fine pitch in the insulating layer.
【０００９】本発明は、例えばグラフィックタイプの有
機ＥＬのように微細なピッチの多数の陰極を有する有機
ＥＬ素子において、陰極を外部に取り出すための新規な
構造を提供することを目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a novel structure for taking out a cathode in an organic EL device having a large number of fine pitch cathodes, such as a graphic type organic EL.
【００１０】[0010]
【課題を解決するための手段】請求項１に記載された有
機エレクトロルミネッセンス素子は、基板１と、前記基
板１の内面に設けられた陽極２と、前記陽極２の上に形
成された正孔輸送層６と、前記正孔輸送層６の上に形成
された発光層７と、前記発光層７の上に形成された陰極
８とを有する有機エレクトロルミネッセンス素子におい
て、前記陰極８とは異なる材料で前記基板１の内面に形
成される取り出し電極５と、前記陰極８の端部に前記取
り出し電極５よりも細い線幅で形成されて前記取り出し
電極５の端部の上に接続される接続端部９とを有してい
る。An organic electroluminescence device according to claim 1 comprises a substrate 1, an anode 2 provided on an inner surface of the substrate 1, and a hole formed on the anode 2. In an organic electroluminescence device having a transport layer 6, a light emitting layer 7 formed on the hole transport layer 6, and a cathode 8 formed on the light emitting layer 7, a material different from the cathode 8 And a connection terminal formed on the inner surface of the substrate 1 at an end of the cathode 8 and having a smaller line width than the extraction electrode 5 and connected to an end of the extraction electrode 5. And a part 9.
【００１１】請求項２に記載された有機エレクトロルミ
ネッセンス素子は、基板１と、前記基板１の内面に所定
方向に沿って所定間隔をおいて形成された複数本の帯状
の陽極２と、前記陽極２の上に形成された正孔輸送層６
と、前記正孔輸送層６の上に形成された発光層７と、前
記発光層７の上に前記陽極２とは交差する方向に沿って
所定間隔をおいて形成された複数本の帯状の陰極８とを
有する有機エレクトロルミネッセンス素子において、前
記陰極８とは異なる材料からなり、前記基板１の内面に
前記陰極８と略平行に形成される複数本の取り出し電極
５と、前記各陰極８の端部に前記取り出し電極５よりも
細い線幅でそれぞれ形成されて前記各取り出し電極５の
端部の上に接続される接続端部９とを有している。An organic electroluminescent device according to claim 2, wherein the substrate 1, a plurality of strip-shaped anodes 2 formed on the inner surface of the substrate 1 at predetermined intervals along a predetermined direction, and Hole transport layer 6 formed on layer 2
A plurality of strip-shaped light-emitting layers 7 formed on the hole transport layer 6 at predetermined intervals along a direction intersecting with the anode 2 on the light-emitting layer 7. In the organic electroluminescence device having the cathode 8, a plurality of extraction electrodes 5 made of a material different from the cathode 8 and formed on the inner surface of the substrate 1 substantially in parallel with the cathode 8, A connection end 9 is formed at an end with a smaller line width than the extraction electrode 5 and is connected to an end of each extraction electrode 5.
【００１２】請求項３に記載された有機エレクトロルミ
ネッセンス素子は、請求項１又は２記載の有機エレクト
ロルミネッセンス素子において、前記取り出し電極５が
仕事関数４．５ｅＶ以上の材料からなることを特徴とし
ている。According to a third aspect of the present invention, there is provided the organic electroluminescence element according to the first or second aspect, wherein the extraction electrode 5 is made of a material having a work function of 4.5 eV or more.
【００１３】請求項４に記載された有機エレクトロルミ
ネッセンス素子は、請求項３記載の有機エレクトロルミ
ネッセンス素子において、仕事関数４．５ｅＶ以上の前
記材料が、ＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘｉｄ
ｅ）、ＺｎＯ：Ａｌ、ＳｎＯ２：Ｓｂ、Ｉｎ２Ｏ３、Ａ
ｕからなる群から選択された物質であることを特徴とし
ている。According to a fourth aspect of the present invention, in the organic electroluminescent element according to the third aspect, the material having a work function of 4.5 eV or more is made of ITO (Indium Tin Oxid).
e), ZnO: Al, SnO 2 : Sb, In 2 O 3 , A
u is a substance selected from the group consisting of u.
【００１４】[0014]
【発明の実施の形態】本発明の実施の形態の一例を図１
及び図２を参照して説明する。図１に示すように、ガラ
ス製の基板１の上には陽極２が形成されている。本例の
陽極２は、所定のピッチで互いに平行に配置された多数
本の帯状である。本例の陽極２はＩＴＯ（Ｉｎｄｉｕｍ
Ｔｉｎ Ｏｘｉｄｅ）からなる。その他、仕事関数
４．５ｅＶ以上の材料であれば陽極２として使用可能で
ある。例えば、ＺｎＯ：Ａｌ、ＳｎＯ２：Ｓｂ、Ｉｎ２
Ｏ３、Ａｕ等が使用できる。前記陽極２の周りには絶縁
層３が枠状に形成されており、陽極２が設けられた絶縁
層３の枠の内方が表示領域になる。前記各陽極２は絶縁
層３の枠の外側にそれぞれ引き出され、各々配線導体４
に接続されている。配線導体４は外部の駆動回路のマイ
ナス側の端子に接続される。FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 1, an anode 2 is formed on a glass substrate 1. The anode 2 of the present example is in the form of a number of strips arranged at a predetermined pitch in parallel with each other. The anode 2 in this example is made of ITO (Indium)
Tin Oxide). In addition, any material having a work function of 4.5 eV or more can be used as the anode 2. For example, ZnO: Al, SnO 2 : Sb, In 2
O 3 , Au or the like can be used. An insulating layer 3 is formed in a frame shape around the anode 2, and the inside of the frame of the insulating layer 3 provided with the anode 2 is a display area. Each of the anodes 2 is drawn out of the frame of the insulating layer 3 and each of the wiring conductors 4
It is connected to the. The wiring conductor 4 is connected to a negative terminal of an external drive circuit.
【００１５】基板１の上には、前記絶縁層３の外縁に接
して取り出し電極５が形成されている。取り出し電極５
は、所定のピッチで互いに平行に配置された多数本の帯
状である。その本数とピッチは後述する陰極８に合わせ
てある。取り出し電極５は、前記陽極２と直交して配置
される。取り出し電極５は、後述する陰極８と異なる材
料で構成されており、本例では前記陽極２と同一の材
料、即ちＩＴＯからなる。従って、本例では、陽極２と
取り出し電極５は同一工程でパターン形成することがで
きる。取り出し電極５は外部の駆動回路のマイナス側の
端子に接続される。On the substrate 1, an extraction electrode 5 is formed in contact with the outer edge of the insulating layer 3. Extraction electrode 5
Are a number of strips arranged in parallel at a predetermined pitch. The number and pitch are adjusted to the cathode 8 described later. The extraction electrode 5 is arranged orthogonal to the anode 2. The extraction electrode 5 is made of a material different from that of a cathode 8 described later. In this example, the extraction electrode 5 is made of the same material as the anode 2, that is, ITO. Therefore, in this example, the anode 2 and the extraction electrode 5 can be patterned by the same process. The extraction electrode 5 is connected to a negative terminal of an external drive circuit.
【００１６】前記陽極２の上には正孔輸送層６が設けら
れている。正孔輸送層６は、例えばトリフェニルアミン
誘導体（Ｄｉａｍｉｎｅ）から構成される。正孔輸送層
６の縁部は絶縁層３の上に被着している。A hole transport layer 6 is provided on the anode 2. The hole transport layer 6 is made of, for example, a triphenylamine derivative (Diamine). The edge of the hole transport layer 6 is deposited on the insulating layer 3.
【００１７】前記正孔輸送層６の上には、有機発光層７
が設けられている。有機発光層７としては、用途に応じ
て所望の発光色の物質を選択すればよく、本例では例え
ばトリス（８−キノリライト）アルミニウム（ＩＩＩ）
（Ａｌｑ３）を使用した。On the hole transport layer 6, an organic light emitting layer 7
Is provided. As the organic light emitting layer 7, a substance having a desired emission color may be selected according to the application. In this example, for example, tris (8-quinolilite) aluminum (III)
(Alq 3 ) was used.
【００１８】前記有機発光層７の上には、陰極８が設け
られている。陰極８は、例えばマグネシウムと銀の合金
から構成される。本例の陰極８は、前記陽極２とは直交
する方向に沿って所定間隔をおいて形成された複数本の
帯状である。On the organic light emitting layer 7, a cathode 8 is provided. The cathode 8 is made of, for example, an alloy of magnesium and silver. The cathode 8 in the present example is a plurality of strips formed at predetermined intervals along a direction orthogonal to the anode 2.
【００１９】従って、帯状の多数本の陽極２と、これに
交差する帯状の多数本の陰極８により、マトリクス表示
領域が構成される。所望の陰極８及び陽極２に表示信号
を与えることによって、マトリクスの任意の交点に対応
した有機発光層７の領域を選択的に発光させることがで
き、これによって任意のグラフィック表示が行える。Therefore, a matrix display area is constituted by a number of strip-shaped anodes 2 and a number of strip-shaped cathodes 8 crossing the anodes. By providing display signals to desired cathodes 8 and anodes 2, it is possible to selectively emit light in the area of the organic light emitting layer 7 corresponding to any intersection of the matrix, thereby performing any graphic display.
【００２０】前記各陰極８の片方の端部は、前記絶縁層
３の上を乗り越えて前記取り出し電極５の上面に達して
いる。図２に示すように、前記各陰極８の片方の端部に
は、陰極８よりも幅の狭い接続端部９がそれぞれ連続し
て形成されており、各接続端部９は対応する各取り出し
電極５の端部の上に接続されている。One end of each cathode 8 extends over the insulating layer 3 and reaches the upper surface of the extraction electrode 5. As shown in FIG. 2, a connection end 9 having a width smaller than that of the cathode 8 is continuously formed at one end of each of the cathodes 8. It is connected on the end of the electrode 5.
【００２１】前記取り出し電極５と前記接続端部９の各
部寸法上の設定について説明する。まず、取り出し電極
５同志の間隔Ａは、電気的な絶縁特性及びパターン形成
プロセス上の限界まで狭くする。具体的には、１０〜５
０μｍの範囲がよい。一方、マスク蒸着によって形成す
る接続端部９の線幅Ｂは、電圧低下や発熱等の電気的特
性から算出される最小線幅に設定される。具体的には５
０〜１００μｍの範囲がよい。The setting of the dimensions of each part of the extraction electrode 5 and the connection end 9 will be described. First, the interval A between the extraction electrodes 5 is narrowed to the limit in the electrical insulation characteristics and the pattern forming process. Specifically, 10-5
The range of 0 μm is good. On the other hand, the line width B of the connection end 9 formed by mask vapor deposition is set to the minimum line width calculated from electrical characteristics such as voltage drop and heat generation. Specifically, 5
The range of 0 to 100 μm is good.
【００２２】さらに具体的に陰極８及び取り出し電極５
のピッチを０．６ｍｍとした場合の接続を考える。取り
出し電極５の幅を０．５５ｍｍ、隣接する取り出し電極
５の間隔を０．０５ｍｍ（５０μｍ）、陰極８の接続端
部９の幅を０．１ｍｍ（１００μｍ）とする。工程の最
後に陰極８及び接続端部９を形成して取り出し電極５に
接続させる際には、陰極８及び接続端部９のパターンは
幅方向（帯状パターンの長手方向と直交する方向）にず
れる。このため、本例のように、幅広の取り出し電極５
に対し、これに同一ピッチで対応する細い接続端部９を
接続する構造であると、陰極８及び接続端部９の形成位
置がずれても、取り出し電極５と陰極８の接続部の接続
抵抗が変化する等、電気的接続に支障が生じるおそれは
少ない。前述した寸法例においては、位置決め許容差が
±０．２２５ｍｍであり、取り出し電極５と陰極８の接
続部の接続抵抗に変化は認められなかった。これに対
し、従来の構造において、陰極及び取り出し電極のピッ
チを０．６ｍｍ、取り出し電極の幅を０．３ｍｍ、陰極
の幅を０．３ｍｍとした場合には、位置決め許容差が±
０．２ｍｍであり、取り出し電極と陰極の接続部の接続
抵抗は常に変化してしまう。More specifically, the cathode 8 and the extraction electrode 5
Is assumed to be 0.6 mm. The width of the extraction electrode 5 is 0.55 mm, the interval between adjacent extraction electrodes 5 is 0.05 mm (50 μm), and the width of the connection end 9 of the cathode 8 is 0.1 mm (100 μm). When the cathode 8 and the connection end 9 are formed at the end of the process and connected to the extraction electrode 5, the pattern of the cathode 8 and the connection end 9 is shifted in the width direction (the direction orthogonal to the longitudinal direction of the strip-shaped pattern). . For this reason, as in this example, the wide extraction electrode 5
On the other hand, if the structure is such that the thin connecting ends 9 corresponding to the same pitch are connected to each other, even if the formation positions of the cathode 8 and the connecting end 9 are displaced, the connection resistance of the connection between the extraction electrode 5 and the cathode 8 is reduced. Is less likely to interfere with the electrical connection, such as changes in In the dimension example described above, the positioning tolerance was ± 0.225 mm, and no change was observed in the connection resistance of the connection portion between the extraction electrode 5 and the cathode 8. On the other hand, in the conventional structure, when the pitch between the cathode and the extraction electrode is 0.6 mm, the width of the extraction electrode is 0.3 mm, and the width of the cathode is 0.3 mm, the positioning tolerance is ±.
0.2 mm, and the connection resistance at the connection between the extraction electrode and the cathode always changes.
【００２３】以上説明した有機ＥＬ素子の各有機層の厚
みは５０ｎｍ程度である。各層の成膜は真空蒸着で行っ
ている。そして、図１に示すように、前記取り出し電極
５の端部と、陽極２の配線導体４の端部を除き、基板１
の上面側の素子構造は保護層１０によって覆われてい
る。The thickness of each organic layer of the organic EL device described above is about 50 nm. Each layer is formed by vacuum evaporation. Then, as shown in FIG. 1, except for the end of the extraction electrode 5 and the end of the wiring conductor 4 of the anode 2,
Is covered with a protective layer 10.
【００２４】[0024]
【発明の効果】本発明によれば、基板上に陽極と正孔輸
送層と発光層と陰極とが積層された有機エレクトロルミ
ネッセンス素子において、基板の内面に陰極とは異なる
材料で取り出し電極を形成し、取り出し電極よりも細い
線幅の接続端部を陰極の端部に形成して取り出し電極の
端部の上に接続したので、陰極のパターンが幅方向に対
して位置ずれしても取り出し電極に対する接続には不都
合がなく、有機ＥＬ素子の陰極を素子外に引き出す構造
として効果がある。特に、多数の帯状パターンの陰極を
有するグラフィックタイプの有機ＥＬ素子等では、従来
のようなスルーホールを介して陰極と取り出し電極を接
続する構造と異なり、陰極の微細なピッチに対応でき、
陰極の素子外への引き出しに関して位置ずれの問題がな
いという特に顕著な効果が得られる。According to the present invention, in an organic electroluminescence device in which an anode, a hole transport layer, a light emitting layer and a cathode are laminated on a substrate, an extraction electrode is formed on the inner surface of the substrate with a material different from the cathode. Then, a connection end having a line width smaller than that of the extraction electrode was formed at the end of the cathode and connected to the end of the extraction electrode. There is no inconvenience in the connection to, and it is effective as a structure for drawing the cathode of the organic EL element out of the element. In particular, in a graphic type organic EL device having a large number of strip-shaped pattern cathodes, unlike the conventional structure in which the cathode and the extraction electrode are connected via through holes, it is possible to cope with the fine pitch of the cathode,
A particularly remarkable effect is obtained in that there is no problem of displacement of the cathode out of the element.
【図１】本発明の実施の形態の一例を示す断面図であ
る。FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.
【図２】図１における陰極の接続端部と取り出し電極の
接続部分を示す平面図である。FIG. 2 is a plan view showing a connection end portion of a cathode and a connection portion of an extraction electrode in FIG. 1;
【図３】従来の一般的な有機ＥＬ素子の構造を例示する
断面図である。FIG. 3 is a cross-sectional view illustrating the structure of a conventional general organic EL element.
【図４】従来の有機ＥＬ素子の構造の一例を示す断面図
である。FIG. 4 is a cross-sectional view showing an example of the structure of a conventional organic EL element.
１ 基板 ２ 陽極 ５ 取り出し電極 ６ 正孔輸送層 ７ 有機発光層 ８ 陰極 ９ 接続端部 DESCRIPTION OF SYMBOLS 1 Substrate 2 Anode 5 Extraction electrode 6 Hole transport layer 7 Organic light emitting layer 8 Cathode 9 Connection end
Claims (4)
極と、前記陽極の上に形成された正孔輸送層と、前記正
孔輸送層の上に形成された発光層と、前記発光層の上に
形成された陰極とを有する有機エレクトロルミネッセン
ス素子において、 前記陰極とは異なる材料で前記基板の内面に形成される
取り出し電極と、前記陰極の端部に前記取り出し電極よ
りも細い線幅で形成されて前記取り出し電極の端部の上
に接続される接続端部とを有する有機エレクトロルミネ
ッセンス素子。1. A substrate, an anode provided on an inner surface of the substrate, a hole transport layer formed on the anode, a light emitting layer formed on the hole transport layer, An organic electroluminescence device having a cathode formed on a layer, a lead electrode formed on the inner surface of the substrate with a material different from the cathode, and a line width narrower than the lead electrode at an end of the cathode. And a connection end connected to an end of the extraction electrode.
って所定間隔をおいて形成された複数本の帯状の陽極
と、前記陽極の上に形成された正孔輸送層と、前記正孔
輸送層の上に形成された発光層と、前記発光層の上に前
記陽極とは交差する方向に沿って所定間隔をおいて形成
された複数本の帯状の陰極とを有する有機エレクトロル
ミネッセンス素子において、 前記陰極とは異なる材料からなり、前記基板の内面に前
記陰極と略平行に形成される複数本の取り出し電極と、 前記各陰極の端部に前記取り出し電極よりも細い線幅で
それぞれ形成されて前記各取り出し電極の端部の上に接
続される接続端部とを有する有機エレクトロルミネッセ
ンス素子。2. A substrate, a plurality of strip-shaped anodes formed at predetermined intervals on an inner surface of the substrate along a predetermined direction, a hole transport layer formed on the anodes, An organic electroluminescence device having a light emitting layer formed on a hole transport layer, and a plurality of strip-shaped cathodes formed on the light emitting layer at predetermined intervals along a direction intersecting with the anode. In the above, a plurality of extraction electrodes formed of a material different from the cathode and formed substantially in parallel with the cathode on the inner surface of the substrate, and formed at the end of each cathode with a line width smaller than the extraction electrode. An organic electroluminescence element having a connection end connected to an end of each of the extraction electrodes.
以上の材料からなる請求項１又は２記載の有機エレクト
ロルミネッセンス素子。3. The extraction electrode has a work function of 4.5 eV.
The organic electroluminescence device according to claim 1, comprising the above material.
ＩＴＯ（Ｉｎｄｉｕｍ ＴｉｎＯｘｉｄｅ）、ＺｎＯ：
Ａｌ、ＳｎＯ２：Ｓｂ、Ｉｎ２Ｏ３、Ａｕからなる群か
ら選択された物質である請求項３記載の有機エレクトロ
ルミネッセンス素子。4. The material having a work function of 4.5 eV or more,
ITO (Indium Tin Oxide), ZnO:
Al, SnO 2: Sb, In 2 O 3, an organic electroluminescence device according to claim 3, wherein from the group consisting of Au is selected substance.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9282472A JPH1187052A (en) | 1997-09-09 | 1997-09-09 | Organic electroluminescence element |
| KR1019980037078A KR100304488B1 (en) | 1997-09-09 | 1998-09-09 | Organic electroluminescence device |
| GB9819650A GB2329280B (en) | 1997-09-09 | 1998-09-09 | Organic electroluminescence device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9282472A JPH1187052A (en) | 1997-09-09 | 1997-09-09 | Organic electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1187052A true JPH1187052A (en) | 1999-03-30 |
Family
ID=17652882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9282472A Pending JPH1187052A (en) | 1997-09-09 | 1997-09-09 | Organic electroluminescence element |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH1187052A (en) |
| KR (1) | KR100304488B1 (en) |
| GB (1) | GB2329280B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561232B1 (en) * | 2001-07-23 | 2006-03-15 | 파이오니아 코포레이션 | Layered wiring line of silver or silver alloy and method for forming the same and display panel substrate using the same |
| JP2006253164A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display |
| JP2006252774A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display device |
| JP2006253163A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display |
| JP2009026770A (en) * | 2008-10-02 | 2009-02-05 | Seiko Epson Corp | Display device |
| JP2009059705A (en) * | 2008-10-02 | 2009-03-19 | Seiko Epson Corp | Display device |
| CN109994530A (en) * | 2019-03-28 | 2019-07-09 | 云谷（固安）科技有限公司 | Display device, display panel and preparation method thereof |
| US11362160B2 (en) | 2018-03-06 | 2022-06-14 | Japan Display Inc. | Organic EL display device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000082588A (en) * | 1997-09-22 | 2000-03-21 | Fuji Electric Co Ltd | Organic light emitting element and manufacture therefor |
| JP2001102169A (en) | 1999-10-01 | 2001-04-13 | Sanyo Electric Co Ltd | El display |
| US6787989B2 (en) * | 2000-06-21 | 2004-09-07 | Nippon Sheet Glass Co., Ltd. | Substrate with transparent conductive film and organic electroluminescence device using the same |
| JP3804858B2 (en) * | 2001-08-31 | 2006-08-02 | ソニー株式会社 | Organic electroluminescent device and manufacturing method thereof |
| JP2007019132A (en) * | 2005-07-06 | 2007-01-25 | Seiko Epson Corp | Method of manufacturing piezoelectric vibrating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5652067A (en) * | 1992-09-10 | 1997-07-29 | Toppan Printing Co., Ltd. | Organic electroluminescent device |
-
1997
- 1997-09-09 JP JP9282472A patent/JPH1187052A/en active Pending
-
1998
- 1998-09-09 KR KR1019980037078A patent/KR100304488B1/en not_active IP Right Cessation
- 1998-09-09 GB GB9819650A patent/GB2329280B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561232B1 (en) * | 2001-07-23 | 2006-03-15 | 파이오니아 코포레이션 | Layered wiring line of silver or silver alloy and method for forming the same and display panel substrate using the same |
| JP2006253164A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display |
| JP2006252774A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display device |
| JP2006253163A (en) * | 2005-03-07 | 2006-09-21 | Ricoh Co Ltd | Organic transistor and display |
| JP2009026770A (en) * | 2008-10-02 | 2009-02-05 | Seiko Epson Corp | Display device |
| JP2009059705A (en) * | 2008-10-02 | 2009-03-19 | Seiko Epson Corp | Display device |
| US11362160B2 (en) | 2018-03-06 | 2022-06-14 | Japan Display Inc. | Organic EL display device |
| CN109994530A (en) * | 2019-03-28 | 2019-07-09 | 云谷（固安）科技有限公司 | Display device, display panel and preparation method thereof |
| US11665946B2 (en) | 2019-03-28 | 2023-05-30 | Yungu (Gu'an) Technology Co., Ltd. | Display devices, display panels, and methods for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2329280B (en) | 2002-01-09 |
| GB2329280A (en) | 1999-03-17 |
| KR100304488B1 (en) | 2001-09-29 |
| KR19990029645A (en) | 1999-04-26 |
| GB9819650D0 (en) | 1998-11-04 |
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