JPH11109918A - Organic el display device - Google Patents
Organic el display deviceInfo
- Publication number
- JPH11109918A JPH11109918A JP9271260A JP27126097A JPH11109918A JP H11109918 A JPH11109918 A JP H11109918A JP 9271260 A JP9271260 A JP 9271260A JP 27126097 A JP27126097 A JP 27126097A JP H11109918 A JPH11109918 A JP H11109918A
- Authority
- JP
- Japan
- Prior art keywords
- organic
- brightness
- light
- anode
- unit
- 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
- 239000010410 layer Substances 0.000 claims description 45
- 239000012044 organic layer Substances 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 27
- 238000006243 chemical reaction Methods 0.000 description 22
- 238000013500 data storage Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 230000005525 hole transport Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- APLQAVQJYBLXDR-UHFFFAOYSA-N aluminum quinoline Chemical compound [Al+3].N1=CC=CC2=CC=CC=C12.N1=CC=CC2=CC=CC=C12.N1=CC=CC2=CC=CC=C12 APLQAVQJYBLXDR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of El Displays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、蛍光性有機化合物
を含む薄膜を陰極と陽極の間に挟んだ構造を有し、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、この励起子が失活
する際の光の放出（蛍光・燐光）を利用して所望の表示
を行う有機ＥＬ（エレクトロルミネッセンス）ディスプ
レイ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a thin film containing a fluorescent organic compound is sandwiched between a cathode and an anode, and excitons are injected into the thin film by injecting electrons and holes and recombining. The present invention relates to an organic EL (electroluminescence) display device that performs desired display by utilizing light emission (fluorescence / phosphorescence) when excitons are generated by generating (exciton).
【０００２】[0002]
【従来の技術】一般的な有機ＥＬディスプレイ装置は、
例えばＭｇ：Ａｇ、Ａｌ：Ｌｉ等の金属電極による陰極
と、ＩＴＯ（Indium Tin Oxide）からなる透明電極によ
る陽極との間に、有機蛍光体薄膜による発光層と有機正
孔輸送層の２層が積層されて複数ドットのマトリクス形
状による素子を構成しており、陽極の外側にはガラス基
板が配設されている。2. Description of the Related Art A general organic EL display device is:
For example, between a cathode made of a metal electrode such as Mg: Ag and Al: Li and an anode made of a transparent electrode made of ITO (Indium Tin Oxide), a light emitting layer made of an organic phosphor thin film and an organic hole transport layer are formed. Elements are formed by laminating a matrix of a plurality of dots, and a glass substrate is disposed outside the anode.
【０００３】この有機ＥＬディスプレイ装置では、有機
蛍光体薄膜による発光層に対し、各電極（陰極、陽極）
から電子と正孔を注入する。そして、上述したように、
電子と正孔を再結合させることにより励起子を生成させ
る。この励起子が失活する際の光の放出により所定のド
ットが発光して所望の表示がなされる。このときの発光
はガラス基板側から観測される。In this organic EL display device, each electrode (cathode, anode) is applied to a light emitting layer formed of an organic phosphor thin film.
Inject electrons and holes from And, as mentioned above,
An exciton is generated by recombining an electron and a hole. Predetermined dots are emitted by emission of light when the excitons are deactivated, and desired display is performed. Light emission at this time is observed from the glass substrate side.
【０００４】ところで、無機ＥＬ素子で構成したディス
プレイ装置では、その寿命も１０万時間を越え、輝度の
低下がほとんど見られない。これに対し、有機ＥＬ素子
で構成したディスプレイ装置では、例えば３００ｃｄ／
ｍ2 の輝度で発光させると、１万時間程度が限界であっ
た。このことは、図４の寿命特性に示すように、動作中
における１ｃｍ2 当たりの電流量が増すに連れ、時間の
経過と共に輝度の低下の度合いが増すことからも判る。[0004] In the meantime, the display device composed of the inorganic EL element has a lifetime exceeding 100,000 hours, and the luminance is hardly reduced. On the other hand, in a display device constituted by an organic EL element, for example, 300 cd /
When light was emitted at a luminance of m 2, the limit was about 10,000 hours. This can be seen from the fact that, as shown in the life characteristics of FIG. 4, the degree of decrease in luminance increases with time as the amount of current per 1 cm 2 during operation increases.
【０００５】このように、有機ＥＬディスプレイ装置で
は、輝度の低下が時間の経過と共に顕著に現れ、動作中
における輝度の低下が最大の課題とされている。As described above, in the organic EL display device, a decrease in luminance appears remarkably with the passage of time, and the decrease in luminance during operation is the biggest problem.
【０００６】ところで、上記有機ＥＬディスプレイ装置
を発光させる具体的な駆動方法として、特開平４−１４
７９４号公報、特開平７−１３４５５８号公報、特開平
６−３０１３５５号公報、特開平８−１８０９７２号公
報等に開示されるものが知られている。As a specific driving method for causing the organic EL display device to emit light, Japanese Patent Laid-Open Publication No.
Japanese Patent Application Laid-Open Nos. 794,794 / 134,558, 6-301355, and 08/180972 are known.
【０００７】[0007]
【発明が解決しようとする課題】しかしなから、上記い
ずれの公報に示す駆動方法も素子自体の耐久性を改善す
るためものであったり、モレ発光等の表示上の改善を目
的としたものであり、上記駆動方法を有機ＥＬディスプ
レイ装置に採用したとしても以下に示すような問題点が
あった。 （１）実用的な輝度と表示容量で、１００００時間以上
の輝度半減寿命を得るのには、極めて限られた構造、材
料のデバイスとなり、技術的に大きく制限される。 （２）必要最小限の輝度が決まっている場合、寿命を考
慮して初期的な輝度を高く設定しなければならず、エネ
ルギー効率が悪い。 （３）輝度の変動が大きいと使用できないアプリケーシ
ョン（例えばプリンター用光源等）がある。However, any of the driving methods disclosed in the above publications is intended to improve the durability of the element itself or to improve the display such as light emission. However, even if the above-described driving method is adopted in an organic EL display device, there are the following problems. (1) To obtain a luminance half life of 10,000 hours or more with practical luminance and display capacity, a device of an extremely limited structure and material is required, which is technically greatly restricted. (2) If the minimum required luminance is determined, the initial luminance must be set high in consideration of the service life, resulting in poor energy efficiency. (3) There is an application that cannot be used if the fluctuation of the luminance is large (for example, a light source for a printer).
【０００８】そこで、本発明は、上記問題点に鑑みてな
されたものであり、使用する材料、構造、投入する電流
密度に依存する所要輝度によって輝度の低下を概略推定
できることに着目し、輝度を所定値に補正して所望の表
示が行える有機ＥＬディスプレイ装置を提供することを
目的としている。Therefore, the present invention has been made in view of the above-mentioned problems, and focuses on the fact that a reduction in luminance can be roughly estimated by a required luminance depending on a used material, a structure, and a supplied current density. It is an object of the present invention to provide an organic EL display device capable of performing a desired display by correcting to a predetermined value.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明は、光を放出する表示部としての有
機層が陽極と陰極との間に積層された有機ＥＬディスプ
レイ装置において、前記表示部の輝度の変化を検出し、
この輝度の変化に応じて前記陽極の駆動電圧又は駆動電
流を可変して前記表示部の輝度を一定に補正する輝度補
正手段を備えたことを特徴とする。In order to achieve the above object, the present invention is directed to an organic EL display device in which an organic layer as a display section for emitting light is laminated between an anode and a cathode. Detecting a change in the brightness of the display unit,
A brightness correction means is provided for correcting the brightness of the display unit to be constant by changing the drive voltage or drive current of the anode in accordance with the change in brightness.
【００１０】請求項２の発明は、光を放出する表示部と
しての有機層が陽極と陰極との間に積層された有機ＥＬ
ディスプレイ装置において、前記表示部の点灯時間をカ
ウントし、このカウントした点灯時間に応じて前記陽極
の駆動電圧又は駆動電流を可変して前記表示部の輝度を
一定に補正する輝度補正手段を備えたことを特徴とす
る。According to a second aspect of the present invention, there is provided an organic EL device having an organic layer as a display unit for emitting light, which is laminated between an anode and a cathode.
The display device includes a brightness correction unit that counts a lighting time of the display unit, and varies a driving voltage or a driving current of the anode according to the counted lighting time to correct the brightness of the display unit to be constant. It is characterized by the following.
【００１１】請求項３の発明は、光を放出する表示部と
しての有機層が陽極と陰極との間に積層された有機ＥＬ
ディスプレイ装置において、前記表示部を避けた位置に
輝度モニター用の発光部を設け、該発光部の輝度を検出
し、この検出した輝度の低下に応じて前記陽極の駆動電
圧又は駆動電流を可変して前記表示部の輝度を一定に補
正する輝度補正手段を備えたことを特徴とする。According to a third aspect of the present invention, there is provided an organic EL device in which an organic layer as a display unit for emitting light is laminated between an anode and a cathode.
In the display device, a light emitting unit for luminance monitoring is provided at a position avoiding the display unit, the luminance of the light emitting unit is detected, and the driving voltage or driving current of the anode is varied according to the detected decrease in luminance. And a brightness correction means for correcting the brightness of the display unit to be constant.
【００１２】請求項４の発明は、請求項３の有機ＥＬデ
ィスプレイ装置において、前記発光部は、観視面側に反
射層を設け、該反射層に対向する陰極が透光性を有する
電極とされており、前記反射層で反射されて前記陰極を
透過した光を受光検出する受光部を備えたことを特徴と
する。According to a fourth aspect of the present invention, in the organic EL display device according to the third aspect, the light emitting section is provided with a reflective layer on a viewing surface side, and a cathode opposed to the reflective layer is provided with an electrode having translucency. And a light receiving unit that receives and detects light reflected by the reflective layer and transmitted through the cathode.
【００１３】[0013]
【発明の実施の形態】図１は本発明による有機ＥＬディ
スプレイ装置の素子構成を示す部分拡大断面図である。FIG. 1 is a partially enlarged cross-sectional view showing an element configuration of an organic EL display device according to the present invention.
【００１４】まず、図１に基いて有機ＥＬディスプレイ
装置の素子構成を説明する。有機ＥＬディスプレイ装置
は、矩形状の素子基板１を基部としている。素子基板１
は、絶縁性および透光性を有するガラス基板で構成され
る。素子基板１の一方の面には、所定パターン形状の陽
極２が形成されている。First, the element configuration of the organic EL display device will be described with reference to FIG. The organic EL display device is based on a rectangular element substrate 1. Element substrate 1
Is formed of a glass substrate having an insulating property and a light transmitting property. On one surface of the element substrate 1, an anode 2 having a predetermined pattern is formed.
【００１５】陽極２は、例えばＩＴＯ（Indium Tin Oxi
de）等の仕事関数の大きい導電性材料による透明電極で
形成される。陽極２の一部は、素子基板１の端部まで引
き出されて電源に接続されている。The anode 2 is made of, for example, ITO (Indium Tin Oxi).
It is formed of a transparent electrode made of a conductive material having a large work function such as de). A part of the anode 2 is drawn out to the end of the element substrate 1 and connected to a power supply.
【００１６】陽極２の表面には、表示部としての有機層
３が積層形成されている。図１の例では、素子基板１側
から正孔輸送層３ａ、発光層３ｂ、電子輸送層３ｃの順
に積層された３層構造で構成される。On the surface of the anode 2, an organic layer 3 as a display section is formed by lamination. In the example of FIG. 1, it has a three-layer structure in which a hole transport layer 3a, a light emitting layer 3b, and an electron transport layer 3c are sequentially stacked from the element substrate 1 side.
【００１７】正孔輸送層３ａは、例えばＴＰＤからな
り、陽極２の表面に積層形成されている。発光層３ｂ
は、正孔輸送層３ａ全体を覆うように、正孔輸送層３ａ
の表面に積層形成されている。The hole transport layer 3 a is made of, for example, TPD and is formed on the surface of the anode 2. Light emitting layer 3b
Is formed so as to cover the entire hole transport layer 3a.
Are laminated on the surface.
【００１８】発光層３ｂの発光材料としては、発光層そ
のものを発光させる場合には、例えばアルミキノリン
（Ａｌｑ）やジスチルアリーレン系化合物等が使用され
る。又、発光層に別の発光材料（ドーパント）を微量ド
ーピングすることでドーパントを発光させる場合には、
ドーパントとしてキナクリドン（Ｑｄ）やレーザ用の色
素等が使用される。As a light emitting material of the light emitting layer 3b, for example, aluminum quinoline (Alq), a distilylylene compound or the like is used when the light emitting layer itself emits light. In addition, when the dopant emits light by doping a small amount of another light emitting material (dopant) into the light emitting layer,
As the dopant, quinacridone (Qd) or a dye for laser is used.
【００１９】電子輸送層３ｃは、発光層３ｂの全体を覆
うように、発光層３ｂの表面に積層形成されている。電
子輸送層３ｃは、例えばＡｌｑ3 で形成される。The electron transport layer 3c is formed on the surface of the light emitting layer 3b so as to cover the entire light emitting layer 3b. The electron transport layer 3c is formed of, for example, Alq 3 .
【００２０】電子輸送層３ｃの表面には、陰極４が積層
形成されている。陰極４は、例えばＡｌ、Ｌｉ、Ｍｇ、
Ａｇ、Ｉｎ等の単体金属やＭｇ：Ａｇ、Ａｌ：Ｌｉ等の
合金で形成される。陰極４は、その一部が素子基板１の
端部まで引き出されて電源に接続されている。A cathode 4 is formed on the surface of the electron transport layer 3c. The cathode 4 is made of, for example, Al, Li, Mg,
It is formed of a simple metal such as Ag or In or an alloy such as Mg: Ag or Al: Li. A part of the cathode 4 is drawn out to the end of the element substrate 1 and connected to a power source.
【００２１】なお、有機層３としては、図１に示す３層
構造に限られるものではない。例えば、発光層３ｂをＡ
ｌｑ3 で形成すれば、電子輸送層３ｃを無くすことがで
き、有機層３は正孔輸送層３ａと発光層３ｂの２層構造
で構成される。又、電子輸送層３ｃに代えて、例えばＬ
ｉ、Ｎａ、Ｍｇ、Ｃａ等の仕事関数の小さい金属材料単
体、Ａｌ：Ｌｉ、Ｍｇ：Ｉｎ、Ｍｇ：Ａｇ等の仕事関数
の小さい合金からなる電子注入層を設けてもよい。The organic layer 3 is not limited to the three-layer structure shown in FIG. For example, if the light emitting layer 3b is A
When formed with lq 3 , the electron transport layer 3c can be eliminated, and the organic layer 3 has a two-layer structure of the hole transport layer 3a and the light emitting layer 3b. Further, instead of the electron transport layer 3c, for example, L
An electron injection layer made of a single metal material having a small work function such as i, Na, Mg, Ca, or the like, or an alloy having a small work function such as Al: Li, Mg: In, or Mg: Ag may be provided.
【００２２】このように、上述した陽極２、有機層３、
陰極４の積層構造により素子基板１上に所定パタン形状
（例えば複数ドットによるマトリクス形状）の有機ＥＬ
素子５が形成される。Thus, the anode 2, the organic layer 3,
An organic EL having a predetermined pattern shape (for example, a matrix shape with a plurality of dots) is formed on the element substrate 1 by the laminated structure of the cathode 4.
The element 5 is formed.
【００２３】陰極４の上方には、陰極４の表面から所定
間隔をおいて素子基板１と平行に矩形状の封止基板６が
配設されている。封止基板６は、絶縁性を有するガラス
基板等で構成される。封止基板６と素子基板１とは、そ
の外周部分が例えば封着剤により封着されている。これ
により、有機ＥＬ素子５を収容した外囲器を構成してい
る。外囲器内には、例えばドライエアやドライ窒素等の
ガスが封入されている。Above the cathode 4, a rectangular sealing substrate 6 is disposed in parallel with the element substrate 1 at a predetermined distance from the surface of the cathode 4. The sealing substrate 6 is formed of an insulating glass substrate or the like. The outer peripheral portions of the sealing substrate 6 and the element substrate 1 are sealed with, for example, a sealing agent. Thus, an envelope accommodating the organic EL element 5 is formed. A gas such as dry air or dry nitrogen is sealed in the envelope.
【００２４】上記構成の有機ＥＬディスプレイ装置で
は、陽極２と陰極４との間に所定の電圧が印加される
と、有機層３における発光層３ｂに対し、陽極２より正
孔輸送層３ａを介して正孔が注入され、陰極４より電子
輸送層３ｃを介して電子が注入される。そして、正孔と
電子を再結合させることにより励起子を生成させる。こ
の励起子が失活する際の光の放出により所望の表示がな
される。このときの発光は素子基板１側から観測され
る。In the organic EL display device having the above structure, when a predetermined voltage is applied between the anode 2 and the cathode 4, the light emitting layer 3b in the organic layer 3 is passed from the anode 2 via the hole transport layer 3a. Then, holes are injected, and electrons are injected from the cathode 4 via the electron transport layer 3c. Then, excitons are generated by recombination of holes and electrons. A desired display is made by emission of light when the excitons are deactivated. Light emission at this time is observed from the element substrate 1 side.
【００２５】図２は上記構成の有機ＥＬディスプレイ装
置における輝度補正手段の第１実施の形態を示すブロッ
ク図である。FIG. 2 is a block diagram showing a first embodiment of the luminance correcting means in the organic EL display device having the above configuration.
【００２６】第１実施の形態の輝度補正手段１１は、特
定の構造、材料を使用した有機ＥＬディスプレイ装置で
は、投入する電流密度で寿命特性が概略推定できること
に着目し、動作中の点灯時間をカウントし、このカウン
トした点灯時間に応じ、図４に示す既知の寿命特性曲線
（輝度低下曲線）に対応させて表示部の輝度を補正して
いる。The luminance correction means 11 of the first embodiment focuses on the fact that, in an organic EL display device using a specific structure and material, the life characteristics can be roughly estimated by the applied current density. Counting is performed, and the brightness of the display unit is corrected in accordance with the known life characteristic curve (brightness reduction curve) shown in FIG. 4 according to the counted lighting time.
【００２７】図２に示すように、第１実施の形態の輝度
補正手段１１は、駆動信号発生手段１２、駆動信号検出
手段１３、設定手段１４、データ記憶手段１５、演算用
データ記憶手段１６、演算制御手段１７、制御信号出力
手段１８、駆動手段１９を備えて概略構成される。As shown in FIG. 2, the brightness correction means 11 of the first embodiment includes a drive signal generation means 12, a drive signal detection means 13, a setting means 14, a data storage means 15, a calculation data storage means 16, It is schematically configured including an arithmetic control unit 17, a control signal output unit 18, and a driving unit 19.
【００２８】駆動信号発生手段１２は、表示部３が１画
面を表示する毎に、所定のデューティ（例えば周波数６
０Ｈｚであれば、１／６０秒）のページ切換信号を発生
している。Each time the display unit 3 displays one screen, the drive signal generating means 12 outputs a predetermined duty (for example,
If it is 0 Hz, a page switching signal of 1/60 second) is generated.
【００２９】駆動信号検出手段１３は、駆動信号発生手
段１２が発生すページ切換信号のデューティを１／６０
秒とすると、１分を計測する為には１２ビットのカウン
ターで構成出来る。駆動信号検出手段１３としてのカウ
ンターは、駆動信号発生手段１２が発生するページ切換
信号をカウントしており、ページ切換信号が入力される
毎に、そのカウント値が１ずつインクリメントされる。
また、カウンターの値は電源がオフしたときにリセット
される。The drive signal detection means 13 reduces the duty of the page switching signal generated by the drive signal generation means 12 to 1/60.
Assuming that the time is in seconds, it can be constituted by a 12-bit counter for measuring one minute. The counter as the drive signal detecting means 13 counts the page switching signal generated by the drive signal generating means 12, and every time the page switching signal is input, the count value is incremented by one.
The value of the counter is reset when the power is turned off.
【００３０】設定手段１４は、例えばボリウム、ディッ
プスイッチ等で構成され、希望する発光輝度の設定値を
アナログ値又はデジタル値で設定している。なお、発光
輝度の設定値がアナログ値で設定される場合には、Ａ／
Ｄ変換回路を介してデジタル値に変換された後、演算制
御手段１７に入力される。これに対し、発光輝度の設定
値がデジタル値で設定される場合には、そのデジタル値
が演算制御手段１７に入力される。The setting means 14 is composed of, for example, a volume, a dip switch, and the like, and sets a desired emission luminance set value by an analog value or a digital value. When the set value of the light emission luminance is set as an analog value, A /
After being converted into a digital value through the D conversion circuit, the digital value is input to the arithmetic control unit 17. On the other hand, when the set value of the emission luminance is set as a digital value, the digital value is input to the arithmetic control unit 17.
【００３１】データ記憶手段１５には、駆動信号検出手
段１３から得られる桁上がり、又はカウンターマッチの
回数が常時更新記憶される。更に説明すると、データ記
憶手段１５は、現在のカウンター値を保持しており、こ
の現在のカウンター値に、次回（電源オフ後の再投入
時）の発光開始後に駆動信号検出手段１３から入力され
るカウンター値が累積できるように、例えば電池等のパ
ックアップ機能を持つメモリ（ＲＡＭ）、ＥＥＰＲＯ
Ｍ、フラッシュメモリ等で構成される。In the data storage means 15, the carry or the number of countermatches obtained from the drive signal detection means 13 is constantly updated and stored. More specifically, the data storage unit 15 holds the current counter value, and the current counter value is input from the drive signal detection unit 13 after the start of light emission next time (when power is turned on again after power is turned off). A memory (RAM) having a backup function such as a battery, EEPRO so that the counter value can be accumulated,
M, a flash memory, and the like.
【００３２】演算用データ記憶手段１６は、ＲＯＭ、Ｅ
ＥＰＲＯＭ、フラッシュメモリ等で構成される。この演
算用データ記憶手段１６には、表示部３の輝度を一定値
に補正するために必要な駆動電圧又は駆動電流を得るた
めの演算プログラムやデータ（例えば図４に示す電流量
に応じた寿命特性のデータ、その近似式）等が予め記憶
されている。The operation data storage means 16 includes a ROM, an E
It is composed of an EPROM, a flash memory and the like. The calculation data storage means 16 stores a calculation program or data for obtaining a drive voltage or a drive current necessary for correcting the luminance of the display unit 3 to a constant value (for example, a lifespan corresponding to a current amount shown in FIG. 4). Characteristics data, its approximate expression) and the like are stored in advance.
【００３３】演算制御手段１７は、表示部３の輝度が設
定手段１４で設定した設定値となるように、データ記憶
手段１５に記憶されたカウンター値から得られる表示部
３の点灯時間と、演算用データ記憶手段１６に記憶され
たデータとに基いて表示部３の輝度の補正量（補正駆動
電圧又は補正駆動電流）を演算している。The arithmetic control unit 17 calculates the lighting time of the display unit 3 obtained from the counter value stored in the data storage unit 15 so that the luminance of the display unit 3 becomes the set value set by the setting unit 14, The correction amount (correction drive voltage or correction drive current) of the luminance of the display unit 3 is calculated based on the data stored in the data storage unit 16.
【００３４】例えば有機ＥＬ素子５を５ｍＡ／ｃｍ2 で
駆動している場合、輝度の設定値が１００％で、カウン
ター値から得られる表示部３の点灯時間が２００時間と
すると、演算用データ記憶手段１６に記憶された図４の
寿命特性のデータから実際の輝度が９５％と判断され
る。そして、輝度９５％を１００％にするために必要な
陽極２の駆動電圧（又は駆動電流）が補正量として演算
され設定される。For example, when the organic EL element 5 is driven at 5 mA / cm 2 , if the set value of the luminance is 100% and the lighting time of the display unit 3 obtained from the counter value is 200 hours, the data for calculation is stored. From the life characteristic data of FIG. 4 stored in the means 16, it is determined that the actual luminance is 95%. Then, the drive voltage (or drive current) of the anode 2 necessary to make the luminance 95% to 100% is calculated and set as a correction amount.
【００３５】制御信号出力手段１８は、例えばＤ／Ａ変
換回路で構成され、演算制御手段１７で演算された補正
量に応じた制御信号を駆動手段１９に出力している。The control signal output means 18 is composed of, for example, a D / A conversion circuit, and outputs a control signal corresponding to the correction amount calculated by the arithmetic control means 17 to the drive means 19.
【００３６】駆動手段１９は、制御信号出力手段１８に
より出力制御可能なボリウム構造を有しており、制御信
号出力手段１８からの制御信号に応じて陽極２の駆動電
圧又は駆動電流を可変している。The drive means 19 has a volume structure whose output can be controlled by the control signal output means 18, and varies the drive voltage or drive current of the anode 2 in accordance with the control signal from the control signal output means 18. I have.
【００３７】上記構成による輝度補正手段１１では、表
示部３が１画面を表示する毎に発生するページ切換信号
をカウントし、このカウンター値から点灯時間が得ら
れ、この点灯時間に応じて、表示部３の輝度が設定値
（例えば１００％（初期輝度））となるように陽極２の
駆動電圧又は駆動電流が可変制御される。これにより、
表示部３の輝度が設定値に補正される。The brightness correction means 11 having the above configuration counts a page switching signal generated each time the display unit 3 displays one screen, and obtains a lighting time from the counter value. The drive voltage or drive current of the anode 2 is variably controlled so that the brightness of the unit 3 becomes a set value (for example, 100% (initial brightness)). This allows
The brightness of the display unit 3 is corrected to the set value.
【００３８】なお、上記輝度補正手段１１において、設
定手段１４を省き、希望する表示部３の輝度のデータを
演算用データ記憶手段１７に予め記憶しておき、表示部
３がこの記憶されたデータの輝度になるように陽極２の
駆動電圧又は駆動電流を可変制御する構成としてもよ
い。In the brightness correction means 11, the setting means 14 is omitted, and the desired brightness data of the display unit 3 is stored in advance in the calculation data storage means 17, and the display unit 3 stores the stored data. The driving voltage or the driving current of the anode 2 may be variably controlled so as to obtain the brightness of.
【００３９】次に、図３は輝度補正手段の第２実施の形
態を示すブロック図である。FIG. 3 is a block diagram showing a second embodiment of the luminance correcting means.
【００４０】第２実施の形態の輝度補正手段２１は、実
際に使用する表示部３の表示の妨げにならない位置で、
表示部３とは別に輝度モニター用の発光部２２を素子基
板１上に設け、このモニター用発光部２２の輝度を測定
し、その測定結果に応じて表示部３の輝度を補正してい
る。The brightness correction means 21 of the second embodiment is provided at a position which does not hinder display of the display unit 3 actually used.
In addition to the display section 3, a luminance monitor light emitting section 22 is provided on the element substrate 1, the luminance of the monitor light emitting section 22 is measured, and the luminance of the display section 3 is corrected according to the measurement result.
【００４１】図３に示すように、第２実施の形態の輝度
補正手段２１は、相対輝度測定手段２３、設定手段２
４、データ変換手段２５、比較制御手段２６、制御信号
出力手段２７、駆動手段２８を備えて構成される。As shown in FIG. 3, the brightness correction means 21 of the second embodiment comprises a relative brightness measurement means 23, a setting means 2
4. Data conversion means 25, comparison control means 26, control signal output means 27, and driving means 28.
【００４２】相対輝度測定手段２３は、モニター用発光
部２２、受光測定部２９を備えて構成される。モニター
用発光部２２は、表示部３とは別に素子基板１に形成さ
れた陽極３１上に有機層（例えば表示部３と同様の正孔
輸送層、発光層、電子輸送層の３層構造）３２が積層形
成され、更に有機層３２上に陰極３３が積層形成されて
いる。The relative luminance measuring means 23 comprises a monitor light emitting section 22 and a light receiving measuring section 29. The monitor light emitting unit 22 includes an organic layer (for example, a three-layer structure of a hole transport layer, a light emitting layer, and an electron transport layer similar to those of the display unit 3) on the anode 31 formed on the element substrate 1 separately from the display unit 3. 32, and a cathode 33 is further formed on the organic layer 32.
【００４３】図５乃至図８は相対輝度測定手段２３の構
成例を示している。図５及び図６に示す構成において、
モニター用発光部２２の有機層３２から放出される光
は、表示部３の観視方向、すなわち、素子基板１の前面
１ａ側で取り出される。受光測定部２９は、モニター用
発光部２２と対向して素子基板１の前面１ａ側に設けら
れる例えば光導電セル（ＣｄＳ）、フォトトランジスタ
等の光電変換素子２９ａを有している。光電変換素子２
９ａは、モニター用発光部２２から放出されて素子基板
１を透過してくる光を受光し、受光した光の強度に応じ
た電気信号（例えば電圧）に変換する。受光測定部２９
は、積分回路又はピークホールド回路を備えており、光
電変換素子２９ａで受光検出された光の強度に応じた電
気信号の積分値又はピーク値をデータ変換手段２５に出
力している。FIGS. 5 to 8 show examples of the structure of the relative luminance measuring means 23. FIG. In the configuration shown in FIGS. 5 and 6,
Light emitted from the organic layer 32 of the monitor light emitting unit 22 is extracted in the viewing direction of the display unit 3, that is, on the front surface 1a side of the element substrate 1. The light reception measurement unit 29 includes a photoelectric conversion element 29a such as a photoconductive cell (CdS) and a phototransistor provided on the front surface 1a side of the element substrate 1 so as to face the monitor light emission unit 22. Photoelectric conversion element 2
9a receives light emitted from the monitor light-emitting unit 22 and transmitted through the element substrate 1, and converts the light into an electric signal (for example, voltage) according to the intensity of the received light. Light receiving measurement unit 29
Has an integration circuit or a peak hold circuit, and outputs an integrated value or a peak value of an electric signal corresponding to the intensity of light received and detected by the photoelectric conversion element 29a to the data conversion means 25.
【００４４】図７及び図８に示す構成において、モニタ
ー用発光部２２の陰極３３がストライプ状に形成されて
おり、その他の構成は図５と同一である。陰極３３の形
状は、光が透過する形状であればよく、ストライプ形状
の他、メッシュ、ドット形状に形成してもよい。モニタ
ー用発光部２２と対向して素子基板１の前面１ａには、
例えばＡｌ等の金属薄膜による反射層３４が形成されて
いる。モニター用発光部２２と対向して封止基板６の背
面６ａには、光電変換素子２９ａが設けられている。こ
れにより、観視者が直接目にする素子基板１の前面１ａ
側に大きな取付スペースを必要とせずに設けることがで
きる。In the configuration shown in FIGS. 7 and 8, the cathode 33 of the monitor light emitting section 22 is formed in a stripe shape, and the other configuration is the same as that of FIG. The shape of the cathode 33 may be any shape as long as it allows light to pass therethrough, and may be formed in a mesh shape or a dot shape in addition to a stripe shape. On the front surface 1a of the element substrate 1 facing the light emitting section 22 for the monitor,
For example, the reflection layer 34 is formed of a metal thin film of Al or the like. A photoelectric conversion element 29a is provided on the back surface 6a of the sealing substrate 6 so as to face the monitor light emitting section 22. As a result, the front surface 1a of the element substrate 1 directly seen by the viewer
It can be provided without requiring a large mounting space on the side.
【００４５】上述した図７の構成では、モニター用発光
部２２から放出された光を一度観視側に取り出し、その
光を反射層３４で反射させて外囲器内部に戻し、モニタ
ー用発光部２２の陰極の隙間から透過した光を光電変換
素子２９ａで受光検出している。In the configuration shown in FIG. 7, the light emitted from the monitor light emitting section 22 is once taken out to the viewing side, and the light is reflected by the reflection layer 34 and returned to the inside of the envelope. Light transmitted through the gap between the cathodes 22 is received and detected by the photoelectric conversion element 29a.
【００４６】なお、図７における陰極３３は、反射層３
４で反射された光が透過するように薄膜金属で形成して
もよい。The cathode 33 in FIG.
It may be formed of a thin film metal so that the light reflected by 4 is transmitted.
【００４７】設定手段２４は、例えばボリウム等で構成
され、希望する表示部３の発光輝度に応じた設定値をア
ナログ値で設定しており、この設定値はデータ変換手段
２５に入力される。なお、設定手段２４を例えばディッ
プスイッチ等で構成し、希望する表示部３の発光輝度の
設定値をデジタル値で設定する場合には、そのデジタル
値がデータ変換手段２５に入力される。The setting means 24 is composed of, for example, a volume or the like, and sets a set value corresponding to a desired light emission luminance of the display unit 3 as an analog value. The set value is input to the data conversion means 25. When the setting means 24 is constituted by, for example, a dip switch or the like and a desired light emission luminance set value of the display unit 3 is set by a digital value, the digital value is input to the data conversion means 25.
【００４８】データ変換手段２５は、例えば２つのＡ／
Ｄ変換回路２５ａ，２５ｂで構成され、一方のＡ／Ｄ変
換回路２５ａでは、相対輝度測定手段２３からのアナロ
グ測定値をデジタル値に変換して比較制御手段２６に出
力している。他方のＡ／Ｄ変換回路２５ｂでは、設定手
段２４からのアナログ設定値をデジタル値に変換して比
較制御手段２６に出力している。The data conversion means 25 includes, for example, two A /
The A / D conversion circuit 25a is composed of D conversion circuits 25a and 25b. The A / D conversion circuit 25a converts the analog measurement value from the relative luminance measurement unit 23 into a digital value and outputs the digital value to the comparison control unit 26. The other A / D conversion circuit 25b converts the analog set value from the setting unit 24 into a digital value and outputs the digital value to the comparison control unit 26.
【００４９】比較制御手段２６は、データ変換手段２５
から入力される測定値と設定値とを比較し、その差が無
くなるように制御信号出力手段２７を制御している。The comparison control means 26 includes a data conversion means 25
The control signal output means 27 is controlled such that the measured value input from the controller is compared with the set value and the difference is eliminated.
【００５０】制御信号出力手段２７は、例えばＤ／Ａ変
換回路で構成され、比較制御手段２６の制御により駆動
手段２８を駆動するための制御信号を駆動手段２７に出
力している。The control signal output means 27 is composed of, for example, a D / A conversion circuit, and outputs a control signal for driving the drive means 28 to the drive means 27 under the control of the comparison control means 26.
【００５１】駆動手段２８は、制御信号出力手段２７に
より出力制御可能なボリウム構造を有しており、制御信
号出力手段２７からの制御信号に応じて陽極２の駆動電
圧又は駆動電流を可変している。The drive means 28 has a volume structure whose output can be controlled by the control signal output means 27, and varies the drive voltage or drive current of the anode 2 according to the control signal from the control signal output means 27. I have.
【００５２】上記構成による輝度補正手段２１では、表
示部３とは別に設けられたモニター用発光部２２による
測定値と、設定手段２４による設定値とを比較し、その
差が無くなる方向に陽極２の駆動電圧又は駆動電流が可
変制御される。例えば測定値が設定値よりも小さけれ
ば、陽極２の駆動電圧を上昇させるか、又は陽極２の駆
動電流を増加させる制御を行なう。これに対し、測定値
が設定値よりも大きければ、陽極２の駆動電圧を下降さ
せるか、又は陽極２の駆動電流を減少させる制御を行な
う。The brightness correction means 21 having the above configuration compares the value measured by the monitor light emitting section 22 provided separately from the display section 3 with the value set by the setting section 24, and sets the anode 2 in a direction in which the difference disappears. Is variably controlled. For example, if the measured value is smaller than the set value, control is performed to increase the drive voltage of the anode 2 or increase the drive current of the anode 2. On the other hand, if the measured value is larger than the set value, control is performed to decrease the driving voltage of the anode 2 or decrease the driving current of the anode 2.
【００５３】なお、上記第２実施の形態では、アナログ
値による測定値及び設定値をデジタル値に変換した後、
両者を比較して補正量を演算しているが、測定値及び設
定値をアナログ値のままアナログコンパレータにより比
較し、その差が無くなる方向に駆動手段２８に入力され
る制御信号を上下させて駆動手段２８を駆動制御し、設
定された表示部３の輝度が得られるように、陽極２の駆
動電圧又は駆動電流を可変制御する構成としてもよい。In the second embodiment, after the measured value and the set value based on the analog value are converted into the digital value,
The correction amount is calculated by comparing the two values. However, the measured value and the set value are compared by an analog comparator while keeping the analog value, and the control signal input to the driving means 28 is moved up and down in a direction in which the difference is eliminated. The driving of the means 28 may be controlled so that the driving voltage or the driving current of the anode 2 is variably controlled so that the set brightness of the display unit 3 is obtained.
【００５４】従って、上記各実施の形態によれば、下記
に示す効果を奏する。（１）実用的な輝度と表示容量
で、１００００時間以上の輝度半減寿命を得られる構
造、材料の選択範囲が広くなり、技術的な汎用性が広が
る。（２）必要最小限の輝度が決まっている場合、寿命
を考慮して初期的な輝度を高く設定する必要がなくな
り、エネルギー効率が良い。（３）輝度変動が大きいと
使用できないアプリケーションにも使用が可能となる。
（例えばプリンター用光源等）（４）回路（輝度補正手
段１１，２１を含む（但し、モニター用発光部２２、光
電変換素子２９ａ、反射層３４を除く））が搭載される
回路基板３５側に光電変換素子２９ａが設けられるの
で、表示面側の素子基板１の前面１ａに表出するのは部
分的な反射層３４のみとなり、センサー部が観視者の妨
げになることがない。また、光電変換素子３４を封止基
板６の背面６ａに取り付けるため、モジュールの組立て
が容易となる。Therefore, according to each of the above embodiments, the following effects can be obtained. (1) The range of structures and materials that can achieve a luminance half life of 10,000 hours or more with practical luminance and display capacity is widened, and technical versatility is expanded. (2) When the required minimum luminance is determined, it is not necessary to set the initial luminance high in consideration of the life, and energy efficiency is good. (3) If the luminance fluctuation is large, it can be used for applications that cannot be used.
(For example, a light source for a printer, etc.) (4) On the circuit board 35 side on which a circuit (including the brightness correction means 11 and 21 (excluding the monitor light emitting unit 22, the photoelectric conversion element 29a, and the reflection layer 34)) is mounted. Since the photoelectric conversion element 29a is provided, only the partial reflection layer 34 is exposed on the front surface 1a of the element substrate 1 on the display surface side, and the sensor unit does not hinder the viewer. In addition, since the photoelectric conversion element 34 is attached to the back surface 6a of the sealing substrate 6, the module can be easily assembled.
【００５５】ところで、上記各実施の形態では、陽極２
の駆動電圧又は駆動電流を可変制御することにより、表
示部３の輝度を補正しているが、ディスプレイ装置とし
ての輝度は電流に依存するため、コントロールし易い駆
動電流を可変制御する方が好ましい。In each of the above embodiments, the anode 2
Although the brightness of the display unit 3 is corrected by variably controlling the drive voltage or the drive current, since the brightness of the display device depends on the current, it is preferable to variably control the drive current that is easy to control.
【００５６】[0056]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、輝度を一定に維持して所望の表示を行なうこと
ができ、具体的には、以下に示す効果を奏する。 （１）実用的な輝度と表示容量で、１００００時間以上
の輝度半減寿命を得られる構造、材料の選択範囲が広く
なり、技術的な汎用性が広がる。 （２）必要最小限の輝度が決まっている場合、寿命を考
慮して初期的な輝度を高く設定する必要がなくなり、エ
ネルギー効率が良い。 （３）輝度変動が大きいと使用できないアプリケーショ
ン（例えばプリンター用光源等）にも使用が可能とな
る。 （４）観視方向の反対側に受光素子を設ける構成とすれ
ば、表示面側は部分的な反射層のみとなり、センサー部
が観視者の妨げになることがない。As is apparent from the above description, according to the present invention, a desired display can be performed while maintaining the luminance constant. Specifically, the following effects are obtained. (1) The range of structures and materials that can achieve a luminance half life of 10,000 hours or more with practical luminance and display capacity is widened, and technical versatility is expanded. (2) When the required minimum luminance is determined, it is not necessary to set the initial luminance high in consideration of the life, and energy efficiency is good. (3) It can be used for applications that cannot be used if the luminance fluctuation is large (for example, a light source for a printer). (4) If the light receiving element is provided on the side opposite to the viewing direction, only the partial reflection layer is provided on the display surface side, and the sensor section does not hinder the viewer.
【図１】本発明による有機ＥＬディスプレイ装置の素子
構成を示す部分拡大断面図FIG. 1 is a partially enlarged cross-sectional view showing an element configuration of an organic EL display device according to the present invention.
【図２】同装置における輝度補正手段の第１実施の形態
を示すブロック図FIG. 2 is a block diagram showing a first embodiment of a luminance correction unit in the device.
【図３】同装置における輝度補正手段の第２実施の形態
を示すブロック図FIG. 3 is a block diagram showing a second embodiment of a luminance correction unit in the device.
【図４】有機ＥＬ素子の寿命特性を示す図FIG. 4 is a view showing a life characteristic of an organic EL element.
【図５】図３の輝度補正手段における相対輝度測定回路
の光検出構成を示す図FIG. 5 is a diagram showing a light detection configuration of a relative luminance measurement circuit in the luminance correction means of FIG. 3;
【図６】図５の断面図FIG. 6 is a sectional view of FIG. 5;
【図７】（ａ）相対輝度測定回路の光検出構成の他の構
成例を示す図 （ｂ）同光検出構成の概略斜視図FIG. 7A is a diagram showing another example of the light detection configuration of the relative luminance measurement circuit. FIG. 7B is a schematic perspective view of the light detection configuration.
【図８】図７の断面図FIG. 8 is a sectional view of FIG. 7;
２，３１…陽極、３，３２…有機層（表示部）、４，３
３…陰極、１１，２１…輝度補正手段、１２…駆動信号
発生手段、１３…駆動信号検出手段、１４，２４…設定
手段、１５…データ記憶手段、１６…演算用データ記憶
手段、１７…演算制御手段、１８，２７…制御信号出力
手段、１９、２８…駆動手段、２２…モニター用発光
部、２３…相対輝度測定手段、２５…データ変換手段、
２６…比較制御手段、２９…受光測定部、３４…反射
層。2, 31 ... anode, 3, 32 ... organic layer (display section), 4, 3
Reference numeral 3 denotes a cathode, 11 and 21: brightness correction means, 12: drive signal generation means, 13: drive signal detection means, 14, 24 ... setting means, 15: data storage means, 16: calculation data storage means, 17: calculation Control means 18, 27 control signal output means 19, 28 drive means 22, monitor light emitting section 23 relative luminance measurement means 25 data conversion means
26: comparison control means, 29: light reception measurement unit, 34: reflection layer.
Claims (4)
極と陰極との間に積層された有機ＥＬディスプレイ装置
において、 前記表示部の輝度の変化を検出し、この輝度の変化に応
じて前記陽極の駆動電圧又は駆動電流を可変して前記表
示部の輝度を一定に補正する輝度補正手段を備えたこと
を特徴とする有機ＥＬディスプレイ装置。1. An organic EL display device in which an organic layer serving as a display unit that emits light is laminated between an anode and a cathode, wherein a change in the brightness of the display unit is detected, and a change in the brightness of the display unit is detected. An organic EL display device comprising: a brightness correction unit that corrects brightness of the display unit by changing a drive voltage or a drive current of the anode.
極と陰極との間に積層された有機ＥＬディスプレイ装置
において、 前記表示部の点灯時間をカウントし、このカウントした
点灯時間に応じて前記陽極の駆動電圧又は駆動電流を可
変して前記表示部の輝度を一定に補正する輝度補正手段
を備えたことを特徴とする有機ＥＬディスプレイ装置。2. In an organic EL display device in which an organic layer as a display unit for emitting light is laminated between an anode and a cathode, a lighting time of the display unit is counted, and according to the counted lighting time. An organic EL display device comprising: a brightness correction unit that corrects brightness of the display unit by changing a drive voltage or a drive current of the anode.
極と陰極との間に積層された有機ＥＬディスプレイ装置
において、 前記表示部を避けた位置に輝度モニター用の発光部を設
け、該発光部の輝度を検出し、この検出した輝度の低下
に応じて前記陽極の駆動電圧又は駆動電流を可変して前
記表示部の輝度を一定に補正する輝度補正手段を備えた
ことを特徴とする有機ＥＬディスプレイ装置。3. An organic EL display device in which an organic layer as a display unit for emitting light is laminated between an anode and a cathode, wherein a light emitting unit for luminance monitoring is provided at a position avoiding the display unit. A brightness correction unit configured to detect the brightness of the light emitting unit and vary the drive voltage or drive current of the anode in accordance with the detected decrease in brightness to correct the brightness of the display unit to be constant. Organic EL display device.
け、該反射層に対向する陰極が透光性を有する電極とさ
れており、 前記反射層で反射されて前記陰極を透過した光を受光検
出する受光部を備えた請求項３記載の有機ＥＬディスプ
レイ装置。4. The light-emitting section is provided with a reflective layer on the viewing surface side, a cathode facing the reflective layer is an electrode having a light-transmitting property, and is reflected by the reflective layer and transmits through the cathode. The organic EL display device according to claim 3, further comprising a light receiving unit that receives and detects the light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9271260A JPH11109918A (en) | 1997-10-03 | 1997-10-03 | Organic el display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9271260A JPH11109918A (en) | 1997-10-03 | 1997-10-03 | Organic el display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11109918A true JPH11109918A (en) | 1999-04-23 |
Family
ID=17497606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9271260A Pending JPH11109918A (en) | 1997-10-03 | 1997-10-03 | Organic el display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11109918A (en) |
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