JP3506326B2 - Organic EL element and organic EL display device - Google Patents
Organic EL element and organic EL display deviceInfo
- Publication number
- JP3506326B2 JP3506326B2 JP29684499A JP29684499A JP3506326B2 JP 3506326 B2 JP3506326 B2 JP 3506326B2 JP 29684499 A JP29684499 A JP 29684499A JP 29684499 A JP29684499 A JP 29684499A JP 3506326 B2 JP3506326 B2 JP 3506326B2
- Authority
- JP
- Japan
- Prior art keywords
- organic
- thin film
- temperature
- temperature compensating
- transparent substrate
- 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.)
- Expired - Fee Related
Links
- 239000010409 thin film Substances 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 15
- 238000007740 vapor deposition Methods 0.000 claims description 9
- 238000004544 sputter deposition Methods 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000004904 shortening Methods 0.000 description 5
- 230000005525 hole transport Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は有機ＥＬ（エレクト
ロルミネセンス）素子及び有機ＥＬ表示装置に関する。
更に詳しくは、本発明は温度変化による輝度の変化を抑
制することで、寿命の短縮を抑制することができ、ま
た、配設や配線等の手間が掛からない有機ＥＬ素子及び
有機ＥＬ表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL (electroluminescence) element and an organic EL display device.
More specifically, the present invention relates to an organic EL element and an organic EL display device which can suppress the shortening of the life by suppressing the change in the brightness due to the temperature change and which does not require the work such as arrangement and wiring. .
【０００２】[0002]
【従来の技術】有機ＥＬ素子は有機蛍光性物質からなる
発光層に電荷を注入して発光させる電流制御型の発光素
子であるため、定電流駆動を行うことで輝度を一定にす
ることができる。しかし、単なる定電流駆動では、温度
変化によって輝度が変化する。つまり、有機ＥＬ素子を
駆動する電流が一定であっても低温では低輝度となり、
高温では高輝度になる。特に、高輝度による発光は寿命
の短縮につながる。2. Description of the Related Art Since an organic EL element is a current control type light emitting element that injects charges into a light emitting layer made of an organic fluorescent substance to emit light, it is possible to make the brightness constant by performing constant current driving. . However, in a simple constant current drive, the brightness changes with temperature changes. That is, even if the current for driving the organic EL element is constant, the brightness becomes low at low temperature,
It becomes bright at high temperature. In particular, light emission due to high brightness leads to shortened life.
【０００３】[0003]
【発明が解決しようとする課題】この温度変化による輝
度の変化を抑制するため、発光物質等、材料面からの検
討がなされている、しかし、輝度の変化を抑制するため
の駆動回路等の検討はなされていない（文献名「有機Ｅ
Ｌ素子とその工業化最前線」、出版年月；９８年１１
月）。本発明は、このような問題点を解決するものであ
り、温度変化による輝度の変化を抑制することができる
とともに、それによる寿命の短縮を抑制することがで
き、また、配設や配線等の手間が掛からない有機ＥＬ素
子及び有機ＥＬ表示装置を提供することを目的とする。In order to suppress the change in brightness due to this temperature change, studies have been made from the viewpoint of the material such as the light emitting substance, but a study on a drive circuit etc. for suppressing the change in brightness has been made. Not released (Reference name "Organic E"
"L element and its forefront of industrialization", date of publication; 1998, 11
Month). The present invention solves such a problem, and can suppress a change in luminance due to a change in temperature, and can also suppress a shortening of the life due to the change in brightness. It is an object of the present invention to provide an organic EL element and an organic EL display device that saves time and labor.
【０００４】[0004]
【課題を解決するための手段】高温時の寿命の短縮を抑
制するには、有機ＥＬ素子の輝度を一定に保つことがで
きるように、駆動電流の補正を行うことが考えられる。
また、有機ＥＬ素子の輝度を一定に保つには、有機ＥＬ
素子の素子温度を測定する温度補償用素子体を設け、こ
の温度補償用素子体の出力による補正を行った定電流駆
動を行うことが考えられる。一方、温度補償用素子体は
有機ＥＬ素子、特に有機ＥＬ薄膜近傍の温度を求める必
要があることから、有機ＥＬ素子の近傍に貼設等の方法
によって配設する必要がある。このため、温度補償用素
子体のための配設作業や配線等が必要となり、煩雑であ
る。上記各問題点を解決するため、本発明の有機ＥＬ素
子及び有機ＥＬ表示装置は以下の構成を有するものとし
た。In order to suppress the shortening of the life at high temperature, it is possible to correct the drive current so that the brightness of the organic EL element can be kept constant.
In order to keep the brightness of the organic EL element constant,
It is conceivable to provide a temperature compensating element body for measuring the element temperature of the element, and perform constant current driving in which the temperature compensating element body has corrected the output. On the other hand, since the temperature compensating element body needs to obtain the temperature in the vicinity of the organic EL element, particularly in the organic EL thin film, it needs to be disposed in the vicinity of the organic EL element by a method such as bonding. Therefore, the work for disposing the temperature compensating element body, wiring, and the like are required, which is complicated. In order to solve each of the above problems, the organic EL element and the organic EL display device of the present invention have the following configurations.
【０００５】 本発明の有機ＥＬ素子は、透明基板と、
該透明基板の表面に少なくとも薄膜状の透明電極、発光
膜を具備する有機ＥＬ薄膜及び背面電極が順次積層さ
れ、形成された有機ＥＬ積層体と、温度補償用素子体
と、上記透明基板に接合され、上記有機ＥＬ積層体を封
止する封止部材と、を備える有機ＥＬ素子であって、該
温度補償用素子体の材質は上記透明電極又は上記背面電
極と同材料であり、該温度補償用素子体は上記有機ＥＬ
素子内に配設され且つ該各電極と同時に形成されること
を特徴とする。更に、透明基板と、該透明基板の表面に
少なくとも薄膜状の透明電極、発光層を具備する有機Ｅ
Ｌ薄膜及び背面電極が順次積層され、形成された有機Ｅ
Ｌ積層体と、温度補償用素子体と、上記透明基板に接合
され、上記有機ＥＬ積層体を封止する封止部材と、を備
える有機ＥＬ素子であって、該温度補償用素子体は上記
有機ＥＬ薄膜表面に形成され、該温度補償用素子体の材
質は上記透明電極又は上記背面電極と同材料であること
を特徴とする。 The organic EL device of the present invention comprises a transparent substrate,
At least a thin film transparent electrode, an organic EL thin film having a light emitting film, and a back electrode are sequentially laminated on the surface of the transparent substrate, and the formed organic EL laminate, the temperature compensating element body, and the transparent substrate are joined together. is, an organic EL element and a sealing member for sealing the organic EL laminate, the
The material of the temperature compensating element is the transparent electrode or the back electrode.
It is made of the same material as the pole, and the temperature compensating element body is the organic EL element.
Being arranged in the element and being formed at the same time as the respective electrodes
Is characterized by. Further, on the transparent substrate and the surface of the transparent substrate
Organic E having at least a thin film transparent electrode and a light emitting layer
Organic E formed by sequentially stacking L thin film and back electrode
Bonding the L laminated body, the temperature compensating element body, and the transparent substrate
And a sealing member for sealing the organic EL laminate.
Which is an organic EL element,
Material of the temperature compensating element body formed on the surface of the organic EL thin film
The quality is the same material as the transparent electrode or the back electrode.
Is characterized by.
【０００６】上記「有機ＥＬ薄膜」は、透明電極及び背
面電極から供給される正孔及び電子を再結合させること
で発光する部位である。この有機ＥＬ薄膜は、少なくと
も有機蛍光性物質を具備する発光層を備える。また、発
光層に加えて正孔注入層、正孔輸送層、電子輸送層及び
電子注入層のうち少なくとも一層を備えることもでき
る。更に、各層を構成する材料としては、それぞれ種々
の公知材料を用いることができる。これらの各層を形成
する方法は、真空蒸着法、スピンコート法、キャスト
法、スパッタリング法、ＬＢ法等の方法を例示すること
ができる。The "organic EL thin film" is a portion that emits light by recombining holes and electrons supplied from the transparent electrode and the back electrode. This organic EL thin film has a light emitting layer containing at least an organic fluorescent substance. Further, in addition to the light emitting layer, at least one of a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer can be provided. Furthermore, various known materials can be used as the material forming each layer. Examples of the method for forming each of these layers include a vacuum vapor deposition method, a spin coating method, a casting method, a sputtering method, and an LB method.
【０００７】上記「温度補償用素子体」は、有機ＥＬ素
子、特に有機ＥＬ薄膜の温度を計測することできる素子
体であればよい。この例として、温度変化による電気抵
抗の変化を用いる抵抗温度計用抵抗体の他、サーミスタ
及び熱電対等を挙げることができる。このうち、温度補
償用素子体としては、抵抗温度計用抵抗体を用いるの
が、安価で容易に形成することができるため好ましい。
また、この抵抗温度計用抵抗体の配設方法は任意に選択
することができ、例として、上記有機ＥＬ素子内に蒸
着、スパッタリング、印刷又はエッチング等によって形
成することを挙げることができる。The "temperature compensating element body" may be any element body capable of measuring the temperature of an organic EL element, particularly an organic EL thin film. Examples of this include a resistance thermometer resistor that uses a change in electric resistance due to a change in temperature, a thermistor, a thermocouple, and the like. Of these, it is preferable to use a resistance thermometer resistor as the temperature compensating element because it is inexpensive and can be easily formed.
The method for disposing the resistor for the resistance thermometer can be arbitrarily selected, and examples thereof include forming the resistor in the organic EL element by vapor deposition, sputtering, printing or etching.
【０００８】温度補償用素子体を配設する場所は、平坦
な場所であってもよいし、傾斜した位置や凹凸面等に配
設することもできる。The location of the temperature compensating element may be a flat location, or it may be located at an inclined position or an uneven surface.
【０００９】更に、抵抗温度計用抵抗体の材質は任意に
選択することができるが、上記透明電極（例えば、ＩＴ
Ｏ〔Indium Tin Oxide〕、酸化インジウム及び酸化スズ
等）又は上記背面電極（例えば、ＭｇＡｇ、Ａｌ等）と
同材質であることが好ましい。このように、抵抗温度計
用抵抗体を各電極と同材質とすることで、各電極と同時
形成することができる。Further, although the material of the resistor for the resistance thermometer can be arbitrarily selected, the transparent electrode (for example, IT
O (Indium Tin Oxide), indium oxide, tin oxide, etc.) or the same material as the back electrode (eg, MgAg, Al, etc.) is preferable. Thus, the resistance thermometer resistor is made of the same material as each electrode, so that the resistance thermometer resistor can be formed simultaneously with each electrode.
【００１０】また、使用する抵抗温度計用抵抗体の抵抗
温度係数は、温度補正回路を適宜選択することで係数の
正負を問わず任意とすることができる。つまり、ＭｇＡ
ｇ等の抵抗温度係数が正である抵抗温度計用抵抗体を用
いた場合は、抵抗温度計用抵抗体の抵抗が低抵抗になる
ほど有機ＥＬ素子の駆動電流が大電流となるような定電
流回路とすればよい（例えば、図３参照）。逆に、ＩＴ
Ｏ等の抵抗温度係数が負である抵抗温度計用抵抗体を用
いた場合は、抵抗温度計用抵抗体の抵抗が高抵抗になる
ほど駆動電流が大電流となるような定電流回路とすれば
よい（例えば、図４参照）。更に、温度変化による有機
ＥＬ素子の輝度の変動度と、抵抗温度計用抵抗体の抵抗
温度係数が異なる場合は、抵抗温度係数が逆である２種
の抵抗体を組合わせることによって任意の抵抗温度係数
を得ることができ、有機ＥＬ素子の輝度が一定になるよ
うに補償することができる。Further, the resistance temperature coefficient of the resistor for resistance thermometer to be used can be arbitrarily set regardless of whether the coefficient is positive or negative by appropriately selecting the temperature correction circuit. That is, MgA
When a resistance thermometer resistor having a positive resistance temperature coefficient such as g is used, a constant current such that the lower the resistance of the resistance thermometer resistor is, the larger the drive current of the organic EL element becomes. A circuit may be used (for example, see FIG. 3). Conversely, IT
When a resistance thermometer resistor having a negative resistance temperature coefficient such as O is used, a constant current circuit in which the driving current increases as the resistance of the resistance thermometer resistor increases Good (see, eg, FIG. 4). Further, when the fluctuation degree of the brightness of the organic EL element due to the temperature change and the resistance temperature coefficient of the resistance thermometer resistor are different, an arbitrary resistance can be obtained by combining two types of resistors having opposite resistance temperature coefficients. The temperature coefficient can be obtained, and the luminance of the organic EL element can be compensated so as to be constant.
【００１１】 温度補償用素子体への配線方法、及び端
子の配設方法は、任意に選択することができる。例え
ば、透明基板の表面等にＩＴＯ薄膜等による配線を設
け、該透明基板の末端に端子を設けることができる。ま
た、有機ＥＬ素子の透明電極及び背面電極に接続される
端子と隣接して配設することができる。このような位置
に配設することで有機ＥＬ素子の配線を簡素にすること
ができ、有機ＥＬ素子の取扱を容易にすることができ
る。 The wiring method to the temperature compensating element body and the terminal arranging method can be arbitrarily selected. For example, wiring made of an ITO thin film or the like can be provided on the surface of the transparent substrate and terminals can be provided at the end of the transparent substrate. Further, it can be arranged adjacent to the terminals connected to the transparent electrode and the back electrode of the organic EL element. By arranging in such a position, the wiring of the organic EL element can be simplified and the handling of the organic EL element can be facilitated .
【００１２】本発明の有機ＥＬ表示装置は、有機ＥＬ素
子と、該有機ＥＬ素子を定電流駆動する駆動手段とを備
える有機ＥＬ表示装置であって、該駆動手段は、温度変
化による該有機ＥＬ素子の輝度変動の補償を、上記温度
補償用素子体を用いた定電流の電流値の補正により行う
ことを特徴とする。The organic EL display device of the present invention is an organic EL display device comprising an organic EL element and a driving means for driving the organic EL element with a constant current, wherein the driving means is the organic EL element due to temperature change. The brightness variation of the element is compensated by correcting the constant current value using the temperature compensating element body.
【００１３】有機ＥＬ素子を駆動する「駆動手段」、及
び駆動手段が具備する「定電流値の補正」を行うための
回路は、いずれか又は両方を有機ＥＬ素子外に設けるこ
とができるし、有機ＥＬ素子内に設けることもできる。Either or both of the "driving means" for driving the organic EL element and the circuit for "correction of the constant current value" included in the driving means can be provided outside the organic EL element, It can also be provided in the organic EL element.
【００１４】[0014]
【発明の実施の形態】以下、図１〜図５を用いて本発明
の有機ＥＬ素子及び有機ＥＬ表示装置を実施例により説
明する。
（１）有機ＥＬ素子の構成
本有機ＥＬ素子は図１及び２に示すように、ガラス製の
透明基板１、ＩＴＯ薄膜からなる陽極である透明電極２
１、有機ＥＬ薄膜２２、背面電極２３、温度補償用素子
体３、及び封止部材４を備える。有機ＥＬ薄膜２２は、
正孔注入層、正孔輸送層、発光層、電子輸送層及び電子
注入層等の各層を順次積層して構成される薄膜である。
また、陰極である背面電極２３は、Ａｌ薄膜からなる。
更に、封止部材４は、各電極２１、２３及び有機ＥＬ薄
膜２２を酸素や水等に接触させないように密閉するため
のものであり、金属や樹脂等からなり、有機ＥＬ薄膜２
２、背面電極２３及び温度補償用素子体３を封止するた
めの凹部空間を有するキャップ状体である。また、封止
部材４は、接着層４１により透明基板１の表面に固定さ
れている。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an organic EL element and an organic EL display device of the present invention will be described by way of examples with reference to FIGS. (1) Structure of Organic EL Element As shown in FIGS. 1 and 2, this organic EL element has a transparent substrate 1 made of glass and a transparent electrode 2 which is an anode made of an ITO thin film.
1, an organic EL thin film 22, a back electrode 23, a temperature compensation element body 3, and a sealing member 4. The organic EL thin film 22 is
It is a thin film formed by sequentially stacking layers such as a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer.
The back electrode 23, which is the cathode, is made of an Al thin film.
Further, the sealing member 4 is for hermetically sealing the electrodes 21, 23 and the organic EL thin film 22 so as not to come into contact with oxygen, water, etc., and is made of metal, resin, etc.
2, a cap-shaped body having a recess space for sealing the back electrode 23 and the temperature compensation element body 3. The sealing member 4 is fixed to the surface of the transparent substrate 1 by the adhesive layer 41.
【００１５】温度補償用素子体３は図１及び２に示すよ
うに、有機ＥＬ薄膜２２の表面に形成される抵抗温度計
用抵抗体であり、ＩＴＯ薄膜からなる配線３１によって
有機ＥＬ素子の透明基板１の表面に設けられた接続端子
３２に接続されている。また、この接続端子３２は、背
面電極２３の接続端子２３１と隣接するように設けられ
ている。更に、この温度補償用素子体３は、陰極である
背面電極２３と同材料であるＡｌ膜からなり、背面電極
２３の蒸着形成と同時に形成されている。As shown in FIGS. 1 and 2, the temperature compensating element body 3 is a resistance thermometer resistor formed on the surface of the organic EL thin film 22, and the wiring 31 made of an ITO thin film makes the organic EL element transparent. It is connected to a connection terminal 32 provided on the surface of the substrate 1. The connection terminal 32 is provided so as to be adjacent to the connection terminal 231 of the back electrode 23. Further, the temperature compensating element body 3 is made of an Al film made of the same material as the back electrode 23 which is the cathode, and is formed at the same time when the back electrode 23 is formed by vapor deposition.
【００１６】（２）有機ＥＬ素子の作製方法
このような有機ＥＬ素子は以下のようにして作製され
る。まず、透明基板１の表面に透明電極２１としてＩＴ
Ｏ薄膜をスパッタリング等の方法により形成した。この
際に、温度補償用素子体３のための配線３１等も同時に
形成した。次いで、透明基板１の表面に有機ＥＬ薄膜２
２の各層（正孔注入層、正孔輸送層、発光層、電子輸送
層、及び電子注入層）を蒸着形成した。(2) Method of Manufacturing Organic EL Element Such an organic EL element is manufactured as follows. First, IT is formed on the surface of the transparent substrate 1 as the transparent electrode 21.
The O thin film was formed by a method such as sputtering. At this time, the wiring 31 and the like for the temperature compensating element body 3 were also formed at the same time. Then, the organic EL thin film 2 is formed on the surface of the transparent substrate 1.
Each layer 2 (hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer) was formed by vapor deposition.
【００１７】その後、有機ＥＬ薄膜２２の表面に背面電
極２３としてＡｌ薄膜を蒸着形成した。また、背面電極
２３とともにＡｌ薄膜を、有機ＥＬ薄膜２２の表面に同
時に蒸着形成し、温度補償用素子体３とした。次いで、
封止部材４を接着剤によって透明基板１に接合し、透明
電極２１、有機ＥＬ薄膜２２、背面電極２３及び温度補
償用素子体３を封止した。After that, an Al thin film was formed as a back electrode 23 on the surface of the organic EL thin film 22 by vapor deposition. Further, an Al thin film together with the back electrode 23 was formed on the surface of the organic EL thin film 22 by vapor deposition at the same time to obtain a temperature compensating element body 3. Then
The sealing member 4 was bonded to the transparent substrate 1 with an adhesive to seal the transparent electrode 21, the organic EL thin film 22, the back electrode 23 and the temperature compensation element body 3.
【００１８】（３）有機ＥＬ素子及び有機ＥＬ表示装置
の効果
このようにして作製された温度補償用素子体３付きの有
機ＥＬ素子は、素子内の温度補償用素子体３の出力を用
いて、駆動電流の補正を行うことができるため、素子温
度の変化によらず、輝度が一定となるように補償を行う
ことができる。これによって、高輝度による有機ＥＬ素
子の寿命の短縮を防ぐことができる。また、本実施例の
有機ＥＬ素子は、素子内の各電極２１、２３及び温度補
償用素子体３を、図３に例示するような駆動回路に接続
して使用する。このような駆動回路を備える有機ＥＬ表
示装置は、駆動端子Ｄの信号により有機ＥＬ素子Ｅの発
光が制御される。更に、温度補償用素子体３によって温
度補正された定電流駆動を行うことで、有機ＥＬ素子の
素子温度が変動しても、一定の輝度を保つことができ
る。つまり、素子温度が高温となる場合は、より高輝度
になることを抑制するために、より電流を減らした定電
流駆動を行う。また、素子温度が低温となる場合は、よ
り低輝度になることを抑制するために、より電流を増や
した定電流駆動を行う。(3) Effects of Organic EL Element and Organic EL Display Device The organic EL element with the temperature compensating element body 3 thus manufactured uses the output of the temperature compensating element body 3 in the element. Since the drive current can be corrected, it is possible to perform the compensation so that the brightness becomes constant regardless of the change in the element temperature. This makes it possible to prevent the life of the organic EL element from being shortened due to high brightness. Further, in the organic EL element of the present embodiment, each electrode 21, 23 in the element and the temperature compensating element body 3 are used by being connected to the driving circuit as illustrated in FIG. In the organic EL display device including such a drive circuit, the light emission of the organic EL element E is controlled by the signal of the drive terminal D. Further, by performing constant-current driving whose temperature is corrected by the temperature compensating element body 3, even if the element temperature of the organic EL element fluctuates, a constant brightness can be maintained. That is, when the element temperature is high, constant current driving with a smaller current is performed in order to suppress higher brightness. Further, when the element temperature is low, constant current driving with a larger current is performed in order to suppress lower brightness.
【００１９】また、有機ＥＬ素子内に温度補償用素子体
３を備えるため、新たに温度計測用の素子を設ける必要
がないため、素子の大きさのみの容積を確保するだけで
素子の配設を行うことができる。また、有機ＥＬ薄膜に
配設することができるため、より正確に有機ＥＬ薄膜の
温度を求めることができ、正確な温度補償を行うことが
できる。更に、温度補償用素子体３を接続する端子を、
透明電極２１及び背面電極２３の接続端子と隣接して設
けたため、配線の取り回しが容易である。また、温度補
償用素子体３は、透明電極２１及び背面電極２３を蒸着
形成するためのマスクパターンの変更のみで形成するこ
とができるため、温度補償用素子体３を備えない有機Ｅ
Ｌ素子と同様の工程で作製することができ、コスト増と
なることなく有機ＥＬ素子を作製することができる。Further, since the temperature compensating element body 3 is provided in the organic EL element, it is not necessary to newly provide a temperature measuring element, so that the element can be disposed by only securing a volume corresponding to the size of the element. It can be performed. Further, since it can be arranged on the organic EL thin film, the temperature of the organic EL thin film can be obtained more accurately, and accurate temperature compensation can be performed. Furthermore, a terminal for connecting the temperature compensating element body 3 is
Since it is provided adjacent to the connection terminals of the transparent electrode 21 and the back electrode 23, the wiring can be easily routed. Further, since the temperature compensating element body 3 can be formed only by changing the mask pattern for forming the transparent electrode 21 and the back electrode 23 by vapor deposition, the organic E without the temperature compensating element body 3 is provided.
It can be manufactured in the same process as the L element, and the organic EL element can be manufactured without increasing the cost.
【００２０】尚、本発明においては、上記実施例に限ら
ず、目的、用途に応じて本発明の範囲内で種々変更した
実施例とすることができる。即ち、温度補償用素子体３
は、有機ＥＬ薄膜２２の表面に形成するだけではなく、
図５及び図６に示すように、透明基板１の表面に形成す
ることができる。また、温度補償用素子体３は、実施例
に示した蒸着による形成ばかりではなく、スパッタリン
グ、印刷又はエッチング等によって形成することができ
る。The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention according to the purpose and application. That is, the temperature compensating element body 3
Is not only formed on the surface of the organic EL thin film 22,
As shown in FIGS. 5 and 6, it can be formed on the surface of the transparent substrate 1. Further, the temperature compensating element body 3 can be formed not only by the vapor deposition shown in the embodiment but also by sputtering, printing or etching.
【００２１】更に、温度補償用素子体３として用いる抵
抗温度計用抵抗体は、実施例に示す陰極に用いられるＡ
ｌばかりではなく、抵抗温度係数が正である他の任意の
材質（例えば、ＭｇＡｇ等）を用いることができる。ま
た、抵抗温度係数が正の材質ばかりではなく負の材質
（例えば、陽極に用いられているＩＴＯ等）を使用する
ことができる。この場合、図４に例示される、抵抗温度
係数が負の抵抗体でも温度変化によらず輝度が一定とな
るような駆動回路とする必要がある。更に、温度補償用
素子体３として抵抗温度計用抵抗体ばかりではなく、サ
ーミスタ及び熱電対等を用いることができる。Further, the resistance element for resistance thermometer used as the temperature compensating element body 3 is A used in the cathode shown in the embodiment.
Not only l, but any other material having a positive temperature coefficient of resistance (for example, MgAg) can be used. Further, not only a material having a positive temperature coefficient of resistance but also a negative material (for example, ITO used for the anode) can be used. In this case, it is necessary to use a driving circuit as illustrated in FIG. 4 in which even a resistor having a negative resistance temperature coefficient has a constant luminance regardless of temperature changes. Further, not only the resistance thermometer resistor but also a thermistor, a thermocouple or the like can be used as the temperature compensating element 3.
【００２２】[0022]
【発明の効果】本発明の有機ＥＬ素子では、温度変化に
よる輝度の変化を抑制することで寿命の短縮を抑制する
ことができる。また、配設や配線等の手間が掛からな
い。また、温度補償用素子体を電極と同時に形成するこ
とができ、工程を増やすことなく有機ＥＬ素子を作製す
ることができる。本発明に示す有機ＥＬ表示装置は、温
度変化による輝度の変化を抑制することで寿命の短縮を
抑制することができる。In the organic EL device of the present invention, it is possible to suppress the shortening of the life by suppressing the change in brightness due to the temperature change. In addition, there is no need for labor such as arrangement and wiring. Further, the temperature compensating element body can be formed at the same time as the electrodes, and the organic EL element can be manufactured without increasing the number of steps. The organic EL display device according to the present invention can suppress the shortening of the life by suppressing the change in luminance due to the change in temperature.
【図１】本実施例の有機ＥＬ素子を説明するための断面
図である。FIG. 1 is a cross-sectional view for explaining an organic EL element of this example.
【図２】本実施例の有機ＥＬ素子において、素子内の構
造を説明するための平面的な模式図である。FIG. 2 is a schematic plan view for explaining the internal structure of the organic EL device of the present embodiment.
【図３】抵抗温度係数が正の温度補償用素子体を備える
有機ＥＬ素子を駆動するための回路例を示す回路図であ
る。FIG. 3 is a circuit diagram showing an example of a circuit for driving an organic EL element including a temperature compensation element body having a positive temperature coefficient of resistance.
【図４】抵抗温度係数が負の温度補償用素子体を備える
有機ＥＬ素子を駆動するための回路例を示す回路図であ
る。FIG. 4 is a circuit diagram showing an example of a circuit for driving an organic EL element including a temperature compensation element body having a negative temperature coefficient of resistance.
【図５】実施例とは異なる配置の温度補償用素子体を備
える有機ＥＬ素子を説明するための断面図である。FIG. 5 is a cross-sectional view for explaining an organic EL element including a temperature compensation element body arranged differently from the example.
【図６】図５に示す有機ＥＬ素子において、素子内の構
造を説明するための平面的な模式図である。FIG. 6 is a schematic plan view for explaining the internal structure of the organic EL device shown in FIG.
１；透明基板、２１；透明電極、２２；有機ＥＬ薄膜、
２３；背面電極、３；温度補償用素子体、４；封止部
材。1; transparent substrate, 21; transparent electrode, 22; organic EL thin film,
23; back electrode, 3; temperature compensation element body, 4; sealing member.
Claims (5)
とも薄膜状の透明電極、発光層を具備する有機ＥＬ薄膜
及び背面電極が順次積層され、形成された有機ＥＬ積層
体と、温度補償用素子体と、上記透明基板に接合され、
上記有機ＥＬ積層体を封止する封止部材と、を備える有
機ＥＬ素子であって、該温度補償用素子体の材質は上記透明電極又は上記背面
電極と同材料であり、 該温度補償用素子体は上記有機Ｅ
Ｌ素子内に配設され且つ該各電極と同時に形成されるこ
とを特徴とする有機ＥＬ素子。1. A transparent substrate, an organic EL thin film formed by sequentially laminating at least a thin film transparent electrode, an organic EL thin film having a light emitting layer, and a back electrode on the surface of the transparent substrate, and a temperature compensating body. Bonded to the element body and the transparent substrate,
An organic EL element comprising: a sealing member for sealing the organic EL laminate, wherein the temperature compensating element is made of the transparent electrode or the back surface.
The same material as the electrode is used, and the temperature compensating element body is made of the organic E
An organic EL element arranged in an L element and formed simultaneously with each of the electrodes .
とも薄膜状の透明電極、発光層を具備する有機ＥＬ薄膜
及び背面電極が順次積層され、形成された有機ＥＬ積層
体と、温度補償用素子体と、上記透明基板に接合され、
上記有機ＥＬ積層体を封止する封止部材と、を備える有
機ＥＬ素子であって、 該温度補償用素子体は上記有機ＥＬ薄膜表面に形成さ
れ、該温度補償用素子体の材質は上記透明電極又は上記
背面電極と同材料であることを特徴とする有機ＥＬ素
子。2. A transparent substrate, an organic EL thin film having at least a thin film transparent electrode, an organic EL thin film having a light emitting layer, and a back electrode, which are sequentially laminated on the surface of the transparent substrate, and an organic EL laminated body formed for temperature compensation. Bonded to the element body and the transparent substrate,
An organic EL element comprising: a sealing member for sealing the organic EL laminate, wherein the temperature compensating element is formed on the surface of the organic EL thin film.
The material of the temperature compensating element is the above transparent electrode or the above
An organic EL device, which is made of the same material as the back electrode .
リング、印刷又はエッチングにより形成される請求項１
又は２に記載の有機ＥＬ素子。3. The temperature compensating element body is formed by vapor deposition, sputtering, printing or etching.
Or the organic EL element according to 2.
抗体である請求項１〜３のいずれかに記載の有機ＥＬ素
子。4. The organic EL device according to any one of claims 1-3 said temperature compensation element body is resistance thermometer resistor.
Ｌ素子と、該有機ＥＬ素子を定電流駆動する駆動手段と
を備える有機ＥＬ表示装置であって、該駆動手段は、温
度変化による該有機ＥＬ素子の輝度変動の補償を、上記
温度補償用素子体を用いた定電流の電流値の補正により
行うことを特徴とする有機ＥＬ表示装置。5. The organic E according to any one of claims 1-4
An organic EL display device comprising an L element and a driving means for driving the organic EL element with a constant current, wherein the driving means compensates for a brightness variation of the organic EL element due to a temperature change. An organic EL display device characterized by performing correction of a constant current value using a body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29684499A JP3506326B2 (en) | 1999-10-19 | 1999-10-19 | Organic EL element and organic EL display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29684499A JP3506326B2 (en) | 1999-10-19 | 1999-10-19 | Organic EL element and organic EL display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001118676A JP2001118676A (en) | 2001-04-27 |
| JP3506326B2 true JP3506326B2 (en) | 2004-03-15 |
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|---|---|---|---|
| JP29684499A Expired - Fee Related JP3506326B2 (en) | 1999-10-19 | 1999-10-19 | Organic EL element and organic EL display device |
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| JP2004200034A (en) * | 2002-12-19 | 2004-07-15 | Seiko Epson Corp | Electro-optical device and its process of manufacture as well as electronic equipment |
| JP4496736B2 (en) * | 2003-09-01 | 2010-07-07 | ソニー株式会社 | Display device |
| DE102004057379B3 (en) * | 2004-11-26 | 2006-08-10 | Schott Ag | Organic luminous unit for e.g. motor vehicle light, has resistor dimensioned such that unit has same brightness at two different temperatures and operation after half-specified life span or after hundred hours of operation at same voltage |
| JP4744905B2 (en) * | 2005-03-24 | 2011-08-10 | 東北パイオニア株式会社 | Self-luminous display panel and manufacturing method thereof |
| US9035337B2 (en) * | 2011-02-14 | 2015-05-19 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting module, light-emitting panel, and lighting device |
| WO2015174515A1 (en) | 2014-05-16 | 2015-11-19 | シャープ株式会社 | Display device |
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| JP3389653B2 (en) * | 1993-10-22 | 2003-03-24 | 三菱化学株式会社 | Organic electroluminescent panel |
| JPH07263616A (en) * | 1994-03-18 | 1995-10-13 | Tokai Rika Co Ltd | Transistor |
| JPH07321088A (en) * | 1994-05-26 | 1995-12-08 | Matsushita Electric Works Ltd | Method for etching thin-film body |
| JP3578417B2 (en) * | 1994-10-21 | 2004-10-20 | 出光興産株式会社 | Organic EL device |
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