JP2001093662A - Protection circuit of ortanic electroluminescence element - Google Patents
Protection circuit of ortanic electroluminescence elementInfo
- Publication number
- JP2001093662A JP2001093662A JP26960299A JP26960299A JP2001093662A JP 2001093662 A JP2001093662 A JP 2001093662A JP 26960299 A JP26960299 A JP 26960299A JP 26960299 A JP26960299 A JP 26960299A JP 2001093662 A JP2001093662 A JP 2001093662A
- Authority
- JP
- Japan
- Prior art keywords
- electroluminescence element
- organic electroluminescence
- protection circuit
- circuit
- organic
- 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
Classifications
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機エレクトロル
ミネセンス素子の保護回路に関する。The present invention relates to a protection circuit for an organic electroluminescence element.
【０００２】[0002]
【従来の技術】図３で示すように、透明基板１１上に酸
化インジウム錫（ＩＴＯ）等の透明導電材料からなる陽
極１２，ひとつ以上の層で構成される有機層（少なくと
も有機発光層の単層構造、あるいは、陽極側から正孔注
入層，正孔輸送層及び電子輸送層等の何れかを有機発光
層と共に積層形成した多層構造から成る）１３及びアル
ミニュウム（Ａｌ）等の金属導電材料からなる陰極１４
を少なくとも有する有機エレクトロルミネセンス素子１
０は、例えば特公平６−３２３０７号公報で開示されて
いる。2. Description of the Related Art As shown in FIG. 3, an anode 12 made of a transparent conductive material such as indium tin oxide (ITO) and an organic layer comprising at least one layer (at least a single organic light emitting layer) are provided on a transparent substrate 11. A layer structure or a multilayer structure in which any one of a hole injection layer, a hole transport layer, an electron transport layer, etc. is laminated with an organic light emitting layer from the anode side) 13 and a metal conductive material such as aluminum (Al). Cathode 14
EL device 1 having at least
0 is disclosed, for example, in Japanese Patent Publication No. 6-32307.
【０００３】斯かる有機エレクトロルミネセンス素子１
０は、陽極１２と陰極１４との間に数ボルト〜数十ボル
トの直流電圧を印加することにより、有機層が光りを放
出するもので、他のエレクトロルミネセンス素子に比べ
て低電圧駆動が可能となる利点を有する。[0003] Such an organic electroluminescent device 1
No. 0 indicates that the organic layer emits light by applying a DC voltage of several volts to several tens of volts between the anode 12 and the cathode 14, and the low voltage driving is performed as compared with other electroluminescent elements. It has the possible advantages.
【０００４】この有機エレクトロルミネセンス素子１０
の駆動回路は、一般に定電流回路によって構成されてお
り、例えば図４で示すものが考えられる。同図におい
て、１０は、図３における陽極１２と陰極１３とのみ示
した有機エレクトロルミネセンス素子であって、この有
機エレクトロルミネセンス素子１０には、トランジスタ
２１と抵抗２２との直列回路を介して電池等の直流電源
２３が接続されている。また、ツェナーダイオード２４
と抵抗２５の直列回路が直流電源２３に並列接続されて
おり、この直列回路の中点はオペアンプ２６のプラス端
子へ接続され、このオペアンプ２６のマイナス端子はオ
ペアンプ２６とトランジスタ２１との接続中点へ接続さ
れている。The organic electroluminescent device 10
Is generally constituted by a constant current circuit, for example, the one shown in FIG. In the figure, reference numeral 10 denotes an organic electroluminescence element shown only in the anode 12 and the cathode 13 in FIG. 3, and the organic electroluminescence element 10 is connected via a series circuit of a transistor 21 and a resistor 22. A DC power supply 23 such as a battery is connected. Also, the Zener diode 24
And a series circuit of a resistor 25 are connected in parallel to the DC power supply 23. The midpoint of the series circuit is connected to the plus terminal of the operational amplifier 26, and the minus terminal of the operational amplifier 26 is Connected to
【０００５】この駆動回路により、有機エレクトロルミ
ネセンス素子１０に供給される電流は、常に一定値にな
るように制御されるものである。The drive circuit controls the current supplied to the organic electroluminescence element 10 so that it always becomes a constant value.
【０００６】[0006]
【発明が解決しようとする課題】ところで、斯かる有機
エレクトロルミネセンス素子１０の駆動回路は、図示し
ないスイッチのオン・オフ時や外部からの強い電気的衝
撃（静電気、雷など）を受けた時などにおいて、有機エ
レクトロルミネセンス素子１０へ過大な電圧が印加され
る場合があり、斯かる場合には有機エレクトロルミネセ
ンス素子１０が破壊されるという問題がある。By the way, the drive circuit of the organic electroluminescent element 10 is used when a switch (not shown) is turned on / off or when a strong external electric shock (such as static electricity or lightning) is applied. In some cases, an excessive voltage is applied to the organic electroluminescence element 10, and in such a case, there is a problem that the organic electroluminescence element 10 is broken.
【０００７】[0007]
【課題を解決するための手段】前記課題を解決するため
の本発明は、透明基板上に透明導電材料からなる陽極，
ひとつ以上の層で構成される有機層及び金属導電材料か
らなる陰極を少なくとも有する有機エレクトロルミネセ
ンス素子に直列に直流電源を接続し、この有機エレクト
ロルミネセンス素子と並列に過大電圧に対するバイパス
回路となる保護回路を設けるものである。According to the present invention, there is provided an anode comprising a transparent conductive material on a transparent substrate.
A DC power supply is connected in series to an organic electroluminescent element having at least an organic layer composed of one or more layers and a cathode made of a metal conductive material, and a bypass circuit for an excessive voltage is formed in parallel with the organic electroluminescent element. A protection circuit is provided.
【０００８】また、透明基板上に透明導電材料からなる
陽極，ひとつ以上の層で構成される有機層及び金属導電
材料からなる陰極を少なくとも有する有機エレクトロル
ミネセンス素子に直列に直流電源を接続し、この有機エ
レクトロルミネセンス素子と並列にツェナーダイオード
を接続して過大電圧に対するバイパス回路となる保護回
路を設けるものである。A direct current power supply is connected in series to an organic electroluminescence element having at least an anode made of a transparent conductive material, an organic layer composed of one or more layers, and a cathode made of a metal conductive material on a transparent substrate, A protection circuit serving as a bypass circuit for an excessive voltage is provided by connecting a Zener diode in parallel with the organic electroluminescence element.
【０００９】特に、前記ツェナーダイオードは、アノー
ド同士又はカソード同士を接続した２個のツェナーダイ
オードの直列回路であって、前記有機エレクトロルミネ
センス素子１０の順・逆方向の過大電圧に対するバイパ
ス回路となる保護回路を構成するものである。In particular, the Zener diode is a series circuit of two Zener diodes having anodes or cathodes connected to each other, and serves as a bypass circuit for the forward and reverse excessive voltages of the organic electroluminescent element 10. It constitutes a protection circuit.
【００１０】[0010]
【発明の実施の形態】有機エレクトロルミネセンス素子
１０と並列に過大電圧に対するバイパス回路となる保護
回路４０を接続する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A protection circuit 40 serving as a bypass circuit for an excessive voltage is connected in parallel with an organic electroluminescence element 10.
【００１１】これにより、有機エレクトロルミネセンス
素子１０へ過大な電圧が印加される場合における有機エ
レクトロルミネセンス素子１０が破壊される問題を防ぐ
ことができる。As a result, it is possible to prevent a problem that the organic electroluminescence element 10 is broken when an excessive voltage is applied to the organic electroluminescence element 10.
【００１２】また、有機エレクトロルミネセンス素子１
０と並列に過大電圧に対するバイパス回路となる保護回
路４１，４２を接続する。The organic electroluminescent device 1
Protection circuits 41 and 42 serving as bypass circuits for excessive voltage are connected in parallel with 0.
【００１３】これにより、有機エレクトロルミネセンス
素子１０へ順・逆方向の過大な電圧が印加される場合に
おける有機エレクトロルミネセンス素子１０が破壊され
る問題を防ぐことができる。Thus, it is possible to prevent a problem that the organic electroluminescence element 10 is broken when an excessively large forward and reverse voltage is applied to the organic electroluminescence element 10.
【００１４】[0014]
【実施例】本発明を、添付図面に示した実施例に基づき
説明するが、前記従来の技術と同一若しくは相当個所に
は同一の符号を付してその詳細な説明を省く。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the accompanying drawings.
【００１５】図１は、本発明の第１実施例に関し、有機
エレクトロルミネセンス素子１０には、直列に直流電源
３０を接続している。FIG. 1 relates to a first embodiment of the present invention, in which a DC power supply 30 is connected to an organic electroluminescence element 10 in series.
【００１６】すなわち、有機エレクトロルミネセンス素
子１０は、直流電源３０による定電圧駆動により発光を
行うものである。これにより、従来例のような定電流駆
動による駆動回路に比べて構成する電子部品点数が少な
くて済み、簡単な構成により部品点数を増やすことのな
い有機エレクトロルミネセンス素子１０の駆動回路とな
る。That is, the organic electroluminescence element 10 emits light by a constant voltage drive by the DC power supply 30. As a result, the number of electronic components to be configured is smaller than that of a driving circuit using constant current driving as in the conventional example, and the driving circuit of the organic electroluminescence element 10 does not increase the number of components with a simple configuration.
【００１７】４０は、１個のツェナーダイオードを有機
エレクトロルミネセンス素子１０の陽極１２と陰極１４
との間に有機エレクトロルミネセンス素子１０と並列と
なるように接続した保護回路である。すなわち、ツェナ
ーダイオード４０のカソードを陽極１２側、アノードを
陰極１４側、に夫々接続して、有機エレクトロルミネセ
ンス素子１０の順方向の過大電圧に対するバイパス回路
を構成している。Numeral 40 designates one Zener diode as the anode 12 and the cathode 14 of the organic electroluminescence element 10.
And a protection circuit connected in parallel with the organic electroluminescence element 10. That is, the cathode of the Zener diode 40 is connected to the anode 12 side, and the anode is connected to the cathode 14 side, thereby constituting a bypass circuit for the forward excessive voltage of the organic electroluminescence element 10.
【００１８】具体的には、有機エレクトロルミネセンス
素子１０が破壊される電圧よりも低い任意の電圧で導通
状態となるツェナーダイオード４０を用いている。Specifically, a Zener diode 40 which is turned on at an arbitrary voltage lower than the voltage at which the organic electroluminescence element 10 is destroyed is used.
【００１９】従って、このツェナーダイオード４０によ
り、有機エレクトロルミネセンス素子１０へ過大な電圧
が印加される場合における有機エレクトロルミネセンス
素子１０が破壊される問題を防ぐことができる。Therefore, the Zener diode 40 can prevent the problem that the organic electroluminescent element 10 is broken when an excessive voltage is applied to the organic electroluminescent element 10.
【００２０】図２は、本発明の第２実施例に関し、有機
エレクトロルミネセンス素子１０と並列となるように接
続した保護回路として、逆方向に電気的直列接続した２
個のツェナーダイオード４１，４２を用いる場合を示し
ており、例えば、アノード同士を接続した２個のツェナ
ーダイオード４１，４２を有機エレクトロルミネセンス
素子１０の陽極１２側と陰極１４側とに接続する構成
（同図（ａ））や、カソード同士を接続した２個のツェ
ナーダイオード４１，４２を有機エレクトロルミネセン
ス素子１０の陽極１２側と陰極１４側とに接続する構成
（同図（ｂ））が考えられる。FIG. 2 relates to a second embodiment of the present invention, and shows a protection circuit connected in parallel with the organic electroluminescence element 10 as a protection circuit connected electrically in series in the reverse direction.
This shows a case where two Zener diodes 41 and 42 are used, for example, a configuration in which two Zener diodes 41 and 42 having anodes connected to each other are connected to the anode 12 side and the cathode 14 side of the organic electroluminescence element 10. (FIG. 2A) and a configuration in which two Zener diodes 41 and 42 connecting cathodes are connected to the anode 12 side and cathode 14 side of the organic electroluminescent element 10 (FIG. 2B). Conceivable.
【００２１】具体的には、有機エレクトロルミネセンス
素子１０が破壊される電圧よりも低い任意の電圧で導通
状態となるツェナーダイオード４１，４２を用いてい
る。More specifically, Zener diodes 41 and 42 which become conductive at an arbitrary voltage lower than the voltage at which the organic electroluminescent element 10 is destroyed are used.
【００２２】斯かる構成においても、有機エレクトロル
ミネセンス素子１０の順・逆方向の過大電圧に対するバ
イパス回路を構成している。Also in this configuration, a bypass circuit for the forward and reverse excessive voltages of the organic electroluminescence element 10 is formed.
【００２３】従って、これらのツェナーダイオード４
１，４２により、有機エレクトロルミネセンス素子１０
へ過大な電圧が印加される場合における有機エレクトロ
ルミネセンス素子１０が破壊される問題を防ぐことがで
きる。Therefore, these Zener diodes 4
1, 42, the organic electroluminescent element 10
The organic electroluminescent element 10 can be prevented from being damaged when an excessive voltage is applied to the device.
【００２４】なお、保護回路としては、前記各実施例で
用いたツェナーダイオード４０，４１，４２以外にも、
例えばサージアブソーバを用いても良い。As the protection circuit, in addition to the Zener diodes 40, 41 and 42 used in the above embodiments,
For example, a surge absorber may be used.
【００２５】[0025]
【発明の効果】本発明によれば、有機エレクトロルミネ
センス素子と並列となるように接続した保護回路により
バイパスを構成して、図示しないスイッチのオン・オフ
時や外部からの強い電気的衝撃（静電気、雷など）を受
けた時などにおいて、有機エレクトロルミネセンス素子
が破壊される問題を防ぐことができる。According to the present invention, a bypass is constituted by a protection circuit connected in parallel with an organic electroluminescence element, and a strong electric shock (not shown) when a switch (not shown) is turned on / off or when a strong external electric shock occurs. (Electrostatics, lightning, etc.) can prevent the problem of destruction of the organic electroluminescent element.
【図１】 本発明の第１実施例の回路図。FIG. 1 is a circuit diagram of a first embodiment of the present invention.
【図２】 本発明の第２実施例の回路図。FIG. 2 is a circuit diagram of a second embodiment of the present invention.
【図３】 有機エレクトロルミネセンス素子の構造を説
明する要部断面図。FIG. 3 is a cross-sectional view of a principal part explaining a structure of an organic electroluminescence element.
【図４】 従来の技術の回路図。FIG. 4 is a circuit diagram of a conventional technique.
１０ 有機エレクトロルミネセンス素子 １２ 陽極 １４ 陰極 ３０ 直流電源 ４０，４１，４２ ツェナーダイオード（保護回路） DESCRIPTION OF SYMBOLS 10 Organic electroluminescent element 12 Anode 14 Cathode 30 DC power supply 40,41,42 Zener diode (protection circuit)
Claims (3)
極，ひとつ以上の層で構成される有機層及び金属導電材
料からなる陰極を少なくとも有する有機エレクトロルミ
ネセンス素子に直列に直流電源を接続し、この有機エレ
クトロルミネセンス素子と並列に過大電圧に対するバイ
パス回路となる保護回路を設けることを特徴とする有機
エレクトロルミネセンス素子の保護回路。1. A direct-current power supply is connected in series to an organic electroluminescence element having at least an anode made of a transparent conductive material, an organic layer composed of one or more layers, and a cathode made of a metal conductive material on a transparent substrate, A protection circuit for an organic electroluminescence element, comprising a protection circuit serving as a bypass circuit for an excessive voltage in parallel with the organic electroluminescence element.
極，ひとつ以上の層で構成される有機層及び金属導電材
料からなる陰極を少なくとも有する有機エレクトロルミ
ネセンス素子に直列に直流電源を接続し、この有機エレ
クトロルミネセンス素子と並列にツェナーダイオードを
接続して過大電圧に対するバイパス回路となる保護回路
を設けることを特徴とする有機エレクトロルミネセンス
素子の保護回路。2. A direct-current power supply is connected in series to an organic electroluminescence element having at least an anode made of a transparent conductive material, an organic layer composed of one or more layers, and a cathode made of a metal conductive material on a transparent substrate, A protection circuit for an organic electroluminescence element, wherein a protection circuit serving as a bypass circuit for an excessive voltage is provided by connecting a Zener diode in parallel with the organic electroluminescence element.
士又はカソード同士を接続した２個のツェナーダイオー
ドの直列回路であって、前記有機エレクトロルミネセン
ス素子１０の順・逆方向の過大電圧に対するバイパス回
路となる保護回路を構成することを特徴とする請求項２
に記載の有機エレクトロルミネセンス素子の保護回路。3. The Zener diode is a series circuit of two Zener diodes having anodes or cathodes connected to each other, and serves as a bypass circuit for the forward / reverse excessive voltage of the organic electroluminescence element 10. 3. The protection circuit according to claim 2, wherein the protection circuit is configured.
3. The protection circuit for an organic electroluminescence element according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26960299A JP2001093662A (en) | 1999-09-24 | 1999-09-24 | Protection circuit of ortanic electroluminescence element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26960299A JP2001093662A (en) | 1999-09-24 | 1999-09-24 | Protection circuit of ortanic electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001093662A true JP2001093662A (en) | 2001-04-06 |
Family
ID=17474659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26960299A Pending JP2001093662A (en) | 1999-09-24 | 1999-09-24 | Protection circuit of ortanic electroluminescence element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001093662A (en) |
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