JP5743244B2 - Organic EL lighting device - Google Patents
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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]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Electroluminescent Light Sources (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
本発明は、有機ＥＬ照明装置に関し、特に、電源投入時や駆動時の破壊防止技術に関する。 The present invention relates to an organic EL lighting device, and more particularly, to a technology for preventing destruction at the time of power-on or driving.
有機ＥＬ照明パネルは、発光ダイオードであると同時に、構造的に大きな並行平板を備えたコンデンサとなっている。そのため、初期状態（電荷が溜まっていない状態）から電源投入時、または初期通電（電圧印加）を行うと、まずそれらのコンデンサの充電を行わなければならないため、過大電流・突入電流が発生、または定電流域からオーバーシュートし、過大電流による絶縁破壊や電気的短絡が発生してしまう。 The organic EL lighting panel is not only a light emitting diode but also a capacitor having a structurally large parallel plate. Therefore, when the power is turned on from the initial state (the state where no electric charge is accumulated), or when initial energization (voltage application) is performed, the capacitors must first be charged. Overshooting from the constant current range will cause breakdown and electrical short circuit due to excessive current.
また、有機ＥＬパネルは容量を持ったコンデンサ成分を具備しているため、静電気の蓄積等により電極間に高電界が掛かるとコンデンサ（有機ＥＬパネル）が絶縁破壊を起こしてしまう。そのため、有機ＥＬ照明の実用化には、この電気的短絡の対策が必須となっている。 In addition, since the organic EL panel includes a capacitor component having a capacity, when a high electric field is applied between the electrodes due to accumulation of static electricity, the capacitor (organic EL panel) causes dielectric breakdown. Therefore, measures for this electrical short circuit are indispensable for practical use of organic EL lighting.
ここで、放電灯を点灯させる際に電圧を段階的、ステップ状に上昇、下降させることにより、立ち上がり、立ち下がりを緩やかにする技術が考えられており、特許文献１に開示されている。 Here, a technique for gradually increasing the rise and fall by increasing and decreasing the voltage stepwise and stepwise when turning on the discharge lamp is disclosed in Patent Document 1.
しかしながら、特許文献１に開示された技術は、蛍光灯等の放電灯に関するものであり、有機ＥＬは全く異なった発光方式を用いているため、回路の観点からすると上記のような問題点を解決できるものではない。 However, the technique disclosed in Patent Document 1 relates to a discharge lamp such as a fluorescent lamp, and the organic EL uses a completely different light emission method, and thus solves the above problems from the viewpoint of the circuit. It is not possible.
具体的には、放電灯（蛍光灯）や白熱灯は、電圧駆動方式であるのに対し、有機ＥＬは電流駆動方式であり、有機ＥＬに流れる電流を制御することにより輝度・照度を調節するものであるため、電圧駆動方式の蛍光灯や白熱灯の照明器具に用いられている回路方式をそのまま有機ＥＬの照明器具に適用することはできない。 Specifically, discharge lamps (fluorescent lamps) and incandescent lamps are voltage-driven, whereas organic EL is current-driven, and the brightness and illuminance are adjusted by controlling the current flowing through the organic EL. Therefore, the circuit system used for the voltage-driven fluorescent lamp and the incandescent lamp cannot be directly applied to the organic EL lighting apparatus.
また、蛍光灯は、交流駆動型照明であるのに対し、有機ＥＬは、一方向の電流時のみ発光する直流駆動型の電子デバイスである。蛍光灯は、内部を真空にした蛍光管の両端にフィラメントを設け、この両端のフィラメント間に電流を流し、このときに水銀蒸気の助けを借りて両端のフィラメント間で生じる真空放電によって発光することになる。このように、蛍光灯管の内部に封じられた水銀蒸気は、直流で点灯した場合、−極の方に集まってしまい、点灯を持続することができない。 A fluorescent lamp is an AC drive type illumination, whereas an organic EL is a DC drive type electronic device that emits light only when current flows in one direction. Fluorescent lamps are provided with filaments at both ends of a fluorescent tube whose interior is evacuated, and an electric current is passed between the filaments at both ends. At this time, light is emitted by a vacuum discharge generated between the filaments at both ends with the help of mercury vapor. become. As described above, when the mercury vapor sealed inside the fluorescent lamp tube is lit with direct current, it collects toward the negative electrode and cannot be lit continuously.
本発明は、上述したような技術が有する問題点に鑑みてなされたものであって、電源投入時における破壊を防止することができる有機ＥＬ照明装置を提供することを目的とする。 The present invention has been made in view of the problems of the above-described technology, and an object thereof is to provide an organic EL lighting device capable of preventing destruction at the time of power-on.
上記目的を達成するために本発明は、
電流の大きさに応じて輝度が変化する発光素子部と、前記発光素子部に電流を制御して電圧を印加する電源供給部と、前記発光素子部を発光させるための信号を前記電源供給部に与える制御部とを有し、前記電源供給部が、前記制御部から与えられた信号に応じて電流を制御することにより電圧を前記発光素子部に印加する有機ＥＬ照明装置において、
前記電源供給部は、電源投入時または電源切断時に、前記発光素子部に印加する電圧を線形に上昇または降下させる制御を行うことを特徴とする。In order to achieve the above object, the present invention provides:
A light-emitting element portion whose luminance changes in accordance with the magnitude of the current; a power supply portion for controlling the current to apply a voltage to the light-emitting element portion; and a signal for causing the light-emitting element portion to emit light. An organic EL lighting device that applies a voltage to the light emitting element unit by controlling a current according to a signal given from the control unit,
The power supply unit performs control to linearly increase or decrease the voltage applied to the light emitting element unit when power is turned on or off.
また、電流の大きさに応じて輝度が変化する発光素子部と、前記発光素子部に電流を制御して電圧を印加する電源供給部と、前記発光素子部を発光させるための信号を前記電源供給部に与える制御部とを有し、前記電源供給部が、前記制御部から与えられた信号に応じて電流を制御することにより電圧を前記発光素子部に印加する有機ＥＬ照明装置において、
前記電源供給部は、電源投入時または電源切断時に、前記発光素子部に印加する電圧を段階的またはステップ状に上昇または降下させる制御を行うことを特徴とする。In addition, a light emitting element portion whose luminance changes in accordance with the magnitude of current, a power supply portion for controlling the current to apply a voltage to the light emitting element portion, and a signal for causing the light emitting element portion to emit light An organic EL lighting device that applies a voltage to the light emitting element unit by controlling a current in accordance with a signal given from the control unit.
The power supply unit performs control to increase or decrease the voltage applied to the light emitting element unit stepwise or stepwise when power is turned on or off.
また、電流の大きさに応じて輝度が変化する発光素子部と、前記発光素子部に電流を制御して電圧を印加する電源供給部と、前記発光素子部を発光させるための信号を前記電源供給部に与える制御部とを有し、前記電源供給部が、前記制御部から与えられた信号に応じて電流を制御することにより電圧を前記発光素子部に印加する有機ＥＬ照明装置において、
前記電源供給部は、電源投入時に、前記発光素子部に対して、前記発光素子部が駆動するための電圧未満の電圧を印加し、その後、前記発光素子部が駆動するための電圧を印加する制御を行うことを特徴とする。In addition, a light emitting element portion whose luminance changes in accordance with the magnitude of current, a power supply portion for controlling the current to apply a voltage to the light emitting element portion, and a signal for causing the light emitting element portion to emit light An organic EL lighting device that applies a voltage to the light emitting element unit by controlling a current in accordance with a signal given from the control unit.
The power supply unit applies a voltage lower than a voltage for driving the light emitting element unit to the light emitting element unit when power is turned on, and then applies a voltage for driving the light emitting element unit. Control is performed.
本発明は、以上説明したように構成されているため、工数やコストを増大させることなく、電源投入時に、通電開始時等または駆動時に急激な過大電流や突入電流があった場合においても、有機ＥＬパネルの絶縁破壊を防止することができる。 Since the present invention is configured as described above, even when there is a sudden excessive current or inrush current at the time of power-on, at the start of energization or at the time of driving without increasing man-hours and costs, The dielectric breakdown of the EL panel can be prevented.
以下に、本発明の実施の形態について図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は、本発明の有機ＥＬ照明装置の実施の一形態を示す図である。 FIG. 1 is a diagram showing an embodiment of an organic EL lighting device of the present invention.
本形態は図１に示すように、電流の大きさに応じて輝度が変化する発光素子部となる有機ＥＬ発光部１０と、商用電源４０と、商用電源４０を用いて有機ＥＬ発光部１０に電流を制御して電圧を印加する電源供給部２０と、有機ＥＬ発光部１０を発光させるための信号を電源供給部２０に与える制御部３０とから構成されている。制御部３０は、有機ＥＬ発光部１０を発光させるための輝度制御信号を生成する輝度制御信号生成部３１を有している。また、電源供給部２０は、商用電源４０による交流電圧を整流、平滑する整流・平滑回路２１と、整流・平滑回路２１にて整流、平滑された交流電圧を直流電圧に変換するコンバータ２２と、コンバータ２２にて変換された直流電圧を用いて制御部３０から与えられた信号に応じて電流を制御し、電圧を有機ＥＬ発光部１０に印加する駆動回路２３とを有している。
In the present embodiment, as shown in FIG. 1, an organic EL light emitting unit 10 serving as a light emitting element unit whose luminance changes according to the magnitude of current, a
図２は、図１に示した有機ＥＬ発光部１０の構成を示す図であり、積層構造を示す。 FIG. 2 is a diagram illustrating a configuration of the organic EL light emitting unit 10 illustrated in FIG. 1 and illustrates a stacked structure.
図１に示した有機ＥＬ発光部１０は図２に示すように、陰極１１と、電子注入層１２と、電子輸送層１３と、発光層１４と、正孔輸送層１５と、正孔注入層１６と、透明電極（ＩＴＯ）１７と、ガラス基板１８と、拡散板１９とが積層された構造を有し、陰極１１と透明電極１７との間の電位差によって電流駆動する一般的なものである。なお、電子輸送層１３と、発光層１４との間に、正孔ブロック層を設けてもよい。また、前記構造に限らず、正孔注入輸送層や発光層に高分子材料を用いた素子構成とすることもできる。
As shown in FIG. 2, the organic EL light emitting unit 10 shown in FIG. 1 includes a
各層の材料としては、以下に例を挙げた中から選択して用いることができるが、これに限ったものではない。 The material of each layer can be selected from the examples given below, but is not limited thereto.
正孔注入層１６には銅フタロシアニン（Ｃｕ-Ｐｃ）やスターバースト型芳香族アミンのようなアリールアミン誘導体等、正孔輸送層１５には、ビス（ジ（ｐ−トリル）アミノフェニル）−１，１−シクロヘキサン、Ｎ,Ｎ’−ジフェニル−Ｎ−Ｎ−ビス（１−ナフチル）−１,１’−ビフェニル）−４,４’−ジアミン（α−ＮＰＤ）、４，４'−ビス（ｍ−トリルフェニルアミノ）ビフェニル（ＴＰＤ）等のトリフェニルジアミン類や、スターバースト型芳香族アミン等を用いることができる。
The
発光層１４には、トリス（８−キノリノール）アルミニウム錯体（Ａｌｑ３）、ビスジフェニルビニルビフェニル（ＢＤＰＶＢｉ）、１，３−ビス（ｐ−ｔ−ブチルフェニル−１，３，４−オキサジアゾールイル）フェニル（ＯＸＤ−７）、Ｎ，Ｎ'−ビス（２，５−ジ−ｔ−ブチルフェニル）ペリレンテトラカルボン酸ジイミド（ＢＰＰＣ）、１，４ビス（Ｎ−ｐ−トリル−Ｎ−４−（４−メチルスチリル）フェニルアミノ）ナフタレン等を用いて形成することができる。
The
また、発光層１４は、ホストとドーパントの二成分系からなるものであってもよく、ホスト化合物として、上記発光材料や正孔輸送材料、後述する電子輸送材料を用いることができる。例えば、Ａｌｑ３等のキノリノール金属錯体に４−ジシアノメチレン−２−メチル−６−（ｐ−ジメチルアミノスチリル）−４Ｈ−ピラン（ＤＣＭ）、４−（ジシアノ メチレン）−２−ｔ−ブチル−６−（１，１，７，７−テトラメチルユロリジル−９−エニル） −４Ｈ−ピラン（ＤＣＪＴＢ）等のピラン系誘導体（赤色）、２，３−キナクリドン等のキナクリドン誘導体や、３−（２'−ベンゾチアゾール）−７−ジエチルアミノクマリン等のクマリン誘導体をドープしたもの（緑色）、電子輸送材料のビス（２−メチル−８−ヒドロキシキノリン）−４−フェニルフェノール−アルミニウム錯体に、ペリレン等の縮合多環芳香族をドープしたもの（青色）、あるいは正孔輸送材料のＴＰＤにルブレン等をドープしたもの（黄色）、４，４’−ビスカルバゾリルビフェニル（ＣＢＰ）、４，４´−ビス（９−カルバゾリル）−２，２’−ジメチルビフェニル（ＣＤＢＰ）等のカルバゾール系化合物に、トリス−（２フェリニルピリジン）イリジウム（Ｉｒ(ｐｐｙ)３）（緑色）、ビス（４，６−ジ−フルオロフェニル）−ピリジネート−Ｎ，Ｃ２） イリジウム（ピコリネート） （ＦＩｒ（ｐｉｃ））（青色）、ビス（２−２’−ベンゾチエニル）−ピリジネート−Ｎ， Ｃ３イリジウム（アセチルアセトネート） （Ｂｔｐ２Ｉｒ（ａｃａｃ））（赤色）、トリス−（ピコリネート）イリジウム （Ｉｒ（ｐｉｃ）３）（赤色）、ビス（２−フェニルベンゾチオゾラト−Ｎ，Ｃ２）イリジウム（アセチルアセトネート） （Ｂｔ２Ｉｒ（ａｃａｃ））（黄色）等のイリジウム錯体や白金錯体をドープしたもの等を用いることができる。
The
正孔ブロック層には、２，９‐ジメチル‐４，７‐ジフェニル‐１，１０‐フェナントロリン（ＢＣＰ）、トリフェニルジアミン誘導体、トリアゾール誘導体等、電子輸送層には、２−（４−ビフェニリル）−５−（４−ｔ−ブチルフェニル）−１，３，４−オキサジアゾール（Ｂｕ−ＰＢＤ）、ＯＸＤ−７等のオキサジアゾール誘導体、トリアゾール誘導体、キノリノール系の金属錯体等を用いることができる。電子輸送層には、２−（４−ビフェニリル）−５−（４−ｔ−ブチルフェニル）−１，３，４−オキサジアゾール（Ｂｕ−ＰＢＤ）、ＯＸＤ−７等のオキサジアゾール誘導体、トリアゾール誘導体、キノリノール系の金属錯体等を用いることができる。電子注入層１２には、リチウムやセシウム等のアルカリ金属、若しくは、カルシウム等のアルカリ土類金属のフッ化物や酸化物等を用いることができる。陰極１１には、アルミニウムや銀などの比抵抗が小さく、反射率の高い材料を用いることができる。
2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), triphenyldiamine derivatives, triazole derivatives, etc. for the hole blocking layer, 2- (4-biphenylyl) for the electron transport layer Use of oxadiazole derivatives such as -5- (4-t-butylphenyl) -1,3,4-oxadiazole (Bu-PBD) and OXD-7, triazole derivatives, quinolinol-based metal complexes, and the like. it can. For the electron transport layer, oxadiazole derivatives such as 2- (4-biphenylyl) -5- (4-t-butylphenyl) -1,3,4-oxadiazole (Bu-PBD) and OXD-7, A triazole derivative, a quinolinol-based metal complex, or the like can be used. For the electron injection layer 12, an alkali metal such as lithium or cesium or a fluoride or oxide of an alkaline earth metal such as calcium can be used. For the
発光材料は赤緑青や黄色に発光し、照明として白色を得る場合は、これらの中から選択して素子を作製し、加法混色して所望の色温度の白色を得る。 When the light emitting material emits red, green, blue, or yellow and white is obtained as illumination, an element is selected from these, and additive color mixing is performed to obtain white at a desired color temperature.
以下に、上記のように構成された有機ＥＬ照明装置の動作について説明する。 Below, operation | movement of the organic electroluminescent illuminating device comprised as mentioned above is demonstrated.
（第１の実施の形態）
図３は、図１に示した有機ＥＬ照明装置の動作の第１の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。なお、図中Ｖｐは有機ＥＬ照明パネル駆動電位、Ｖｇは接地電位を示す。(First embodiment)
FIG. 3 is a diagram for explaining the first embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10. In the figure, Vp represents an organic EL lighting panel drive potential, and Vg represents a ground potential.
図３に示すように、本形態においては、電源供給部２０において、電源投入時（立ち上げ時）または電源切断時（立ち下げ時）に、有機ＥＬ発光部１０に印加する電圧を線形に上昇または降下させる制御を行い、それにより、突入電流による急峻な電位変動を防止する。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、時間が長いと点灯の応答速度が遅く感じられる。突入電流を防止するだけの充電量があればよい。 As shown in FIG. 3, in the present embodiment, in the power supply unit 20, the voltage applied to the organic EL light emitting unit 10 increases linearly when the power is turned on (when starting up) or when the power is turned off (when turning off). Alternatively, a control for lowering is performed, thereby preventing a steep potential fluctuation due to an inrush current. The time until the voltage applied to the organic EL light emitting unit 10 reaches the stable driving voltage is preferably equal to or longer than the time constant of the circuit. However, if the time is long, the response speed of lighting is felt to be slow. It is sufficient if there is enough charge to prevent inrush current.
正孔注入材料にＣｕ−Ｐｃ、正孔輸送材料にα−ＮＰＤ、発光材料としてＣＢＰにＩｒ（ｐｐｙ）３、Ｂｔｐ２Ｉｒ（ａｃａｃ）をドープ、さらにＣＢＰにＦＩｒ（ｐｉｃ）をドープし、正孔ブロック層にＢＣＰ、電子輸送層にＡｌｑ３、電子注入材料にＬｉＦ、陰極にＡｌを用いて素子を作製し、駆動電流を２５Ａ／ｍ2流したところ、駆動電圧は４．８Ｖ、輝度は９２５ｃｄ／ｍ2、この照明パネルとしての時定数は、０．２２ｍ秒であった。この有機ＥＬ照明点灯装置を、点灯開始から１０ｍ秒を掛けて電流を制御し、定常時駆動電流、安定駆動電圧となるまで上昇させ、消灯時に１０ｍ秒を掛けて電圧を降下させた。評価サンプル数ｎ＝２５で２４時間点灯試験を行い、ショート不良を確認したところ、不良は発生しなかった。Hole injection material is Cu-Pc, hole transport material is α-NPD, light emission material is CBP doped with Ir (ppy) 3, Btp2Ir (acac), CBP is doped with FIr (pic), and hole blocking A device was fabricated using BCP for the layer, Alq3 for the electron transport layer, LiF for the electron injection material, and Al for the cathode, and a drive current of 25 A / m 2 was applied. The drive voltage was 4.8 V and the luminance was 925 cd / m. 2. The time constant for this lighting panel was 0.22 ms. This organic EL illumination lighting device was controlled to take 10 ms from the start of lighting, and increased to a steady state drive current and a stable drive voltage, and lowered to 10 ms when turned off. When a lighting test was conducted for 24 hours with the number of evaluation samples n = 25 and a short circuit defect was confirmed, no defect occurred.
比較例として、同じ構成の素子に従来の駆動方法と同じく、電源投入時に定常駆動電流を流す、または止めたところ、駆動開始から２４時間以内に評価サンプル数ｎ＝２５中、１９パネルでショート不良が認められた。 As a comparative example, as in the conventional driving method, when a power source is turned on, a steady driving current is supplied to or stopped from an element having the same configuration. Was recognized.
（第２の実施の形態）
図４は、図１に示した有機ＥＬ照明装置の動作の第２の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Second Embodiment)
FIG. 4 is a diagram for explaining the second embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10.
図４に示すように、本形態においては、電源供給部２０において、電源投入時（立ち上げ時）または電源切断時（立ち下げ時）に、有機ＥＬ発光部１０に印加する電圧を段階的にまたはステップ状に上昇または降下させる制御を行い、それにより、突入電流による急峻な電位変動を防止する。この際、ステップ数（段数）とステップ幅、ステップ高さを可変とし、これらによって充電を制御できる。例えば、立ち上がり初期はステップ幅を大きく、かつステップ高さを小さくし、駆動電圧に近づくに従ってステップ幅を小さく、かつ高さを大きくすれば、電圧の急峻な上昇がなく、電気的短絡による不良を回避することができる。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、人の目に認識される点灯の応答速度が遅くなる。突入電流を防止するだけの充電量があればよい。 As shown in FIG. 4, in the present embodiment, in the power supply unit 20, the voltage applied to the organic EL light emitting unit 10 is stepwise when the power is turned on (when starting up) or when the power is turned off (when turning off). Alternatively, control to increase or decrease stepwise is performed, thereby preventing steep potential fluctuations due to inrush current. At this time, the number of steps (the number of steps), the step width, and the step height can be made variable to control charging. For example, if the step width is increased and the step height is decreased at the beginning of the rise, the step width is decreased and the height is increased as the drive voltage is approached. It can be avoided. Note that the time until the voltage applied to the organic EL light emitting unit 10 becomes a stable driving voltage is preferably equal to or more than the time constant of the circuit, but the lighting response speed recognized by human eyes is slow. It is sufficient if there is enough charge to prevent inrush current.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ２流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９３０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を、点灯開始から定常時駆動電流、安定駆動電圧となるまで１０ｍ秒をかけて電流値を制御し、３段階で電圧を上昇、消灯時には１０ｍ秒をかけて３段階で降下させた。詳細には、最初の５ｍ秒で０．３Ｖ、次の３ｍ秒で１．２Ｖ、次の２ｍ秒で３．３Ｖのステップで昇圧した。評価サンプル数ｎ＝２５で２４時間点灯試験を行い、ショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 930 cd / m 2 . This organic EL lighting lighting device takes 10 milliseconds to control the current value from the start of lighting until it reaches a steady state driving current and a stable driving voltage. Lowered. Specifically, the voltage was boosted in steps of 0.3 V in the first 5 ms, 1.2 V in the next 3 ms, and 3.3 V in the next 2 ms. When a lighting test was conducted for 24 hours with the number of evaluation samples n = 25 and a short circuit defect was confirmed, no defect occurred.
（第３の実施の形態）
図５は、図１に示した有機ＥＬ照明装置の動作の第３の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Third embodiment)
FIG. 5 is a diagram for explaining the third embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10.
図５に示すように、本形態においては、電源供給部２０において、電源投入時（立ち上げ時）に、有機ＥＬ発光部１０に対して、発光開始電圧Ｖth以下、少なくとも有機ＥＬ発光部１０を駆動させるための電圧Ｖf以下の電圧となる電流を流し、この電圧分で有機ＥＬパネルの充電を行い、その後、有機ＥＬ発光部１０が駆動するための安定駆動電圧（定電流駆動時の到達電圧）を印加する制御を行い、それにより、突入電流による急峻な電位変動を防止する。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、人の目に認識される点灯の応答速度が遅くなる。突入電流を防止するだけの充電量があればよい。As shown in FIG. 5, in the present embodiment, the power supply unit 20 has a light emission start voltage V th or lower and at least the organic EL light emitting unit 10 with respect to the organic EL light emitting unit 10 when the power is turned on (at startup). A current that is equal to or lower than the voltage V f for driving the battery is supplied, the organic EL panel is charged with this voltage, and then the stable drive voltage for driving the organic EL light emitting unit 10 (at the time of constant current driving). (Applied voltage) is applied, whereby abrupt potential fluctuation due to inrush current is prevented. Note that the time until the voltage applied to the organic EL light emitting unit 10 becomes a stable driving voltage is preferably equal to or more than the time constant of the circuit, but the lighting response speed recognized by human eyes is slow. It is sufficient if there is enough charge to prevent inrush current.
第１の実施の形態と同じ構成の有機ＥＬパネルを作製し、定常時駆動電流を２５Ａ／ｍ２流したところ、定常時における駆動電圧は４．７Ｖ、輝度は９２０ｃｄ／ｍ2であった。駆動開始から６ｍ秒間、有機ＥＬ発光部の電位が１．９Ｖとなるよう電流を流した後、定常時駆動電流、安定駆動電圧となるまで電圧を上昇、消灯時には１．９Ｖを６ｍ秒間維持した後、０Ｖ（装置接地電位）まで降下させた。評価サンプル数ｎ＝２５で２４時間点灯試験を行い、ショート不良を確認したところ、不良は発生しなかった。When an organic EL panel having the same configuration as that of the first embodiment was produced and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.7 V and the luminance was 920 cd / m 2 . After flowing the current so that the potential of the organic EL light emitting unit becomes 1.9 V for 6 msec from the start of driving, the voltage is increased until the steady driving voltage and the stable driving voltage are reached, and 1.9 V is maintained for 6 msec when extinguished. Thereafter, the voltage was lowered to 0 V (device ground potential). When a lighting test was conducted for 24 hours with the number of evaluation samples n = 25 and a short circuit defect was confirmed, no defect occurred.
（第４の実施の形態）
図６は、図１に示した有機ＥＬ照明装置の動作の第４の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Fourth embodiment)
FIG. 6 is a diagram for explaining the fourth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図６に示すように、本形態においては、電源供給部２０において、電源投入時（立ち上げ時）または電源切断時（立ち下げ時）に、有機ＥＬ発光部１０に印加する電圧を、最初の印加電圧を小さく、徐々に電圧の上昇幅を大きくするよう指数関数波形に上昇、または逆の波形で降下させる制御を行い、それにより、突入電流による急峻な電位変動を防止する。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、時間が長いと点灯の応答速度が遅く感じられる。突入電流を防止するだけの充電量があればよい。 As shown in FIG. 6, in the present embodiment, in the power supply unit 20, the voltage applied to the organic EL light emitting unit 10 at the time of turning on (starting up) or turning off (turning off) Control is performed to increase the exponential waveform so that the applied voltage is decreased and gradually increase the voltage, or to decrease the waveform with the reverse waveform, thereby preventing abrupt potential fluctuation due to inrush current. The time until the voltage applied to the organic EL light emitting unit 10 reaches the stable driving voltage is preferably equal to or longer than the time constant of the circuit. However, if the time is long, the response speed of lighting is felt to be slow. It is sufficient if there is enough charge to prevent inrush current.
第１の実施例の形態と同じ構成の有機ＥＬパネルを作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を、点灯開始から１０ｍ秒を掛けて電流を制御し、定常時駆動電流、安定駆動電圧となるまで指数関数波形となるよう上昇させ、消灯時に１０ｍ秒を掛けて同様な波形で電圧を降下させた。評価サンプル数ｎ＝２５で２４時間点灯試験を行い、ショート不良を確認したところ、不良は発生しなかった。When an organic EL panel having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 920 cd / m 2 . . This organic EL illumination lighting device is controlled to have a current of 10 ms from the start of lighting, and is increased to an exponential function waveform until it reaches a steady-state driving current and a stable driving voltage. The voltage was dropped in the waveform. When a lighting test was conducted for 24 hours with the number of evaluation samples n = 25 and a short circuit defect was confirmed, no defect occurred.
（第５の実施の形態）
図７は、図１に示した有機ＥＬ照明装置の動作の第５の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Fifth embodiment)
FIG. 7 is a diagram for explaining a fifth embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows a voltage applied to the organic EL light emitting unit 10.
図７に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、そのパルス信号の立ち上がりまたは立ち下がり時にパルス信号について第１の実施の形態に示したものと同様の制御を行う。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 7, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, the same control as that described in the first embodiment is performed on the pulse signal when the pulse signal rises or falls. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
このように、有機ＥＬ照明装置の調光・調色時でＰＷＭ（パルス幅変調）駆動を行う場合においても、本発明を適用できる。 As described above, the present invention can also be applied to the case where PWM (pulse width modulation) driving is performed at the time of light adjustment / color adjustment of the organic EL lighting device.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。そのパルス信号の立ち上がり時に、電流を制御することにより点灯開始から２ｍ秒を掛けて定常時駆動電流、安定駆動電圧となるまで上昇させ、または立ち下がり時に２ｍ秒を掛けて電圧を降下させた。これを１サイクルとし、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 925 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. At the rising edge of the pulse signal, the current was controlled to increase the steady-state driving current and the stable driving voltage by taking 2 msec from the start of lighting, or dropped to 2 msec at the falling to reduce the voltage. This was one cycle, and a lighting test was performed for 24 hours at a duty ratio of 10 to 70%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
比較例として、同じ構成の素子に従来のパルス幅変調方法と同じく、パルス信号の立ち上がりまたは立ち下がり時に定常駆動電流、駆動電圧を瞬時に加えるまたは止めたところ、駆動開始から２４時間以内に評価サンプル数ｎ＝２５中、２１パネルでショート不良が認められた。 As a comparative example, as in the case of the conventional pulse width modulation method, when a steady drive current and drive voltage are instantaneously applied or stopped at the rising or falling edge of a pulse signal to an element having the same configuration, an evaluation sample is obtained within 24 hours from the start of driving. In the number n = 25, a short circuit failure was observed on 21 panels.
（第６の実施の形態）
図８は、図１に示した有機ＥＬ照明装置の動作の第６の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Sixth embodiment)
FIG. 8 is a diagram for explaining the sixth embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10.
図８に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、そのパルス信号の立ち上がりまたは立ち下がり時にパルス信号について第２の実施の形態に示したものと同様の制御を行う。この際、ステップ数（段数）とステップ幅、ステップ高さを可変とし、これらによって充電を制御できる。例えば、立ち上がり初期はステップ幅を大きく、かつステップ高さを小さくし、駆動電圧に近づくに従ってステップ幅を小さく、かつ高さを大きくすれば、電圧の急峻な上昇がなく、電気的短絡による不良を回避することができる。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 8, in the present embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. Then, the power supply unit 20 performs the same control as that described in the second embodiment for the pulse signal when the pulse signal rises or falls. At this time, the number of steps (the number of steps), the step width, and the step height can be made variable to control charging. For example, if the step width is increased and the step height is decreased at the beginning of the rise, the step width is decreased and the height is increased as the drive voltage is approached. It can be avoided. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
このように、有機ＥＬ照明装置の調光・調色時でＰＷＭ（パルス幅変調）駆動を行う場合においても、本発明を適用できる。 As described above, the present invention can also be applied to the case where PWM (pulse width modulation) driving is performed at the time of light adjustment / color adjustment of the organic EL lighting device.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．６Ｖ、輝度は９１５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。そのパルス信号の立ち上がり時に、定常時駆動電流、安定駆動電圧となるまで２ｍ秒をかけて電流を制御し、３段階で電圧を上昇、消灯時には２ｍ秒をかけて３段階で降下させた。詳細には、最初の１ｍ秒で０．２Ｖ、次の０．７ｍ秒で１．３Ｖ、次の０．３ｍ秒で３．１Ｖのステップで昇圧し、また、立ち下がり時には、同様に、２ｍ秒を掛けて３段階で電圧を降圧した。これを１サイクルとし、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.6 V and the luminance was 915 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. At the rising edge of the pulse signal, the current was controlled by taking 2 ms until the steady-state driving current and the stable driving voltage were reached, and the voltage was increased in three steps, and when the light was extinguished, the current was lowered in three steps over 2 ms. Specifically, the voltage is boosted in steps of 0.2 V for the first 1 msec, 1.3 V for the next 0.7 msec, and 3.1 V for the next 0.3 msec. The voltage was stepped down in three stages taking 2 seconds. This was one cycle, and a lighting test was performed for 24 hours at a duty ratio of 10 to 70%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
（第７の実施の形態）
図９は、図１に示した有機ＥＬ照明装置の動作の第７の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Seventh embodiment)
FIG. 9 is a diagram for explaining the seventh embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図９に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、そのパルス信号の立ち上がりまたは立ち下がり時にパルス信号について第３の実施の形態に示したものと同様の制御を行う。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 9, in the present embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal to perform light control and color adjustment. In the power supply unit 20, the same control as that described in the third embodiment is performed for the pulse signal when the pulse signal rises or falls. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。点灯開始から１ｍ秒間電流を制御し、２．０Ｖを印加した後、定常時駆動電流、安定駆動電圧となるまで電圧を上昇、非点灯区間は２．０Ｖまで電圧を降下させた。消灯時には２．０Ｖを１ｍ秒間維持した後、０Ｖ（装置接地電位）まで降下させた。これを１サイクルとし、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady driving current was supplied at 25 A / m 2 , the steady driving voltage was 4.8 V and the luminance was 920 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. The current was controlled for 1 msec from the start of lighting, and after applying 2.0 V, the voltage was increased until the steady-state driving current and the stable driving voltage were reached, and the voltage was decreased to 2.0 V in the non-lighting period. When the light was extinguished, 2.0 V was maintained for 1 msec and then lowered to 0 V (device ground potential). This was one cycle, and a lighting test was performed for 24 hours at a duty ratio of 10 to 70%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
このように、有機ＥＬ照明装置の調光・調色時でＰＷＭ（パルス幅変調）駆動を行う場合においても、本発明を適用できる。 As described above, the present invention can also be applied to the case where PWM (pulse width modulation) driving is performed at the time of light adjustment / color adjustment of the organic EL lighting device.
（第８の実施の形態）
図１０は、図１に示した有機ＥＬ照明装置の動作の第８の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Eighth embodiment)
FIG. 10 is a diagram for explaining the eighth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１０に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、そのパルス信号の立ち上がりまたは立ち下がり時にパルス信号について第４の実施の形態に示したものと同様の制御を行う。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 10, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs light control and color adjustment. Then, the power supply unit 20 performs the same control as that described in the fourth embodiment for the pulse signal when the pulse signal rises or falls. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
第１の実施例の形態と同じ構成の有機ＥＬパネルを作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９１５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。そのパルス信号の立ち上がり時に、電流を制御することにより点灯開始から２ｍ秒を掛けて定常時駆動電流、安定駆動電圧となるまで指数関数波形となるよう上昇させ、または立ち下がり時に２ｍ秒を掛けて同様な波形で電圧を降下させた。これを１サイクルとし、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an organic EL panel having the same configuration as that of the first example was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 915 cd / m 2 . . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. At the rise of the pulse signal, by controlling the current, it is multiplied by 2 ms from the start of lighting and increased to an exponential waveform until it reaches the steady-state drive current and stable drive voltage, or at the fall by 2 ms. The voltage was dropped with a similar waveform. This was one cycle, and a lighting test was performed for 24 hours at a duty ratio of 10 to 70%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
（第９の実施の形態）
図１１は、図１に示した有機ＥＬ照明装置の動作の第９の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Ninth embodiment)
FIG. 11 is a diagram for explaining the ninth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１１に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、立ち下がり時の電圧を０Ｖまたは接地電位以下としておき、パルス信号の立ち上がりまたは立ち下がり時にパルス信号について第１または第５の実施の形態に示したものと同様の制御を行う。有機材料のキャリア伝導性は、分子間の酸化と還元を繰り返しているが、一方向への継続的な電圧印加は材料の劣化を促進し、有機ＥＬの輝度劣化、電圧上昇の一因となっている。そこで、本形態のように、駆動電圧とは逆極性の電圧を印加しておくことで、電荷蓄積による劣化促進を抑制することができ、長寿命化を図ることができる。また、逆極性の電圧により前のパルス（サイクル）による電荷蓄積が無くなるため、次のパルスによる立ち上がり時の鈍りによる駆動品質の低下を防ぐことができる。 As shown in FIG. 11, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs light control and color adjustment. In the power supply unit 20, the voltage at the time of falling is set to 0 V or the ground potential or less, and the control similar to that shown in the first or fifth embodiment is performed for the pulse signal at the rising or falling of the pulse signal. I do. The carrier conductivity of organic materials repeats oxidation and reduction between molecules, but continuous application of voltage in one direction promotes deterioration of the material and contributes to deterioration of luminance and voltage increase of organic EL. ing. Therefore, as in this embodiment, by applying a voltage having a polarity opposite to that of the drive voltage, deterioration promotion due to charge accumulation can be suppressed, and a longer life can be achieved. In addition, since charge accumulation due to the previous pulse (cycle) is eliminated due to the reverse polarity voltage, it is possible to prevent a decrease in drive quality due to dullness at the rising edge due to the next pulse.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、パルス信号の立ち下がり時の電圧を−５Ｖとし、パルス信号の立ち上がり時に、電流を制御することにより定常時駆動電流、安定駆動電圧となるまで２ｍ秒をかけて上昇させ、または立ち下がり時に２ｍ秒を掛けて電圧を降下させ、これを１サイクルとし、交番電界を印加した。評価サンプル数ｎ＝２５で、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。ショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady driving current was supplied at 25 A / m 2 , the steady driving voltage was 4.8 V and the luminance was 920 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, the voltage at the falling edge of the pulse signal is set to -5 V, and at the rising edge of the pulse signal, the current is controlled to increase the steady-state driving current and the stable driving voltage over 2 milliseconds, or At the time of falling, the voltage was lowered by applying 2 ms, and this was taken as one cycle, and an alternating electric field was applied. A lighting test was performed for 24 hours with the number of evaluation samples n = 25 and a duty ratio of 10 to 70%. When short-circuit defect was confirmed, no defect occurred.
（第１０の実施の形態）
図１２は、図１に示した有機ＥＬ照明装置の動作の第１０の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Tenth embodiment)
FIG. 12 is a diagram for explaining the tenth embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10.
図１２に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、立ち下がり時の電圧を０Ｖまたは接地電位以下としておき、パルス信号の立ち上がりまたは立ち下がり時にパルス信号について第２または第６の実施の形態に示したものと同様の制御を行う。有機材料のキャリア伝導性は、分子間の酸化と還元を繰り返しているが、一方向への継続的な電圧印加は材料の劣化を促進し、有機ＥＬの輝度劣化、電圧上昇の一因となっている。そこで、本形態のように、駆動電圧とは逆極性の電圧を印加しておくことで、電荷蓄積による劣化促進を抑制することができ、長寿命化を図ることができる。また、逆極性の電圧により前のパルス（サイクル）による電荷蓄積が無くなるため、次のパルスによる立ち上がり時の鈍りによる駆動品質低下を防ぐことができる。 As shown in FIG. 12, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, the voltage at the time of falling is set to 0 V or the ground potential or less, and the control similar to that shown in the second or sixth embodiment is performed on the pulse signal at the rising or falling of the pulse signal. I do. The carrier conductivity of organic materials repeats oxidation and reduction between molecules, but continuous application of voltage in one direction promotes deterioration of the material and contributes to deterioration of luminance and voltage increase of organic EL. ing. Therefore, as in this embodiment, by applying a voltage having a polarity opposite to that of the drive voltage, deterioration promotion due to charge accumulation can be suppressed, and a longer life can be achieved. In addition, since charge accumulation due to the previous pulse (cycle) is eliminated due to the reverse polarity voltage, it is possible to prevent a decrease in drive quality due to dullness at the rising edge due to the next pulse.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．７Ｖ、輝度は９１５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、パルス信号の立ち下がり時の電圧を−４Ｖとし、立ち上がり時に、定常時駆動電流、安定駆動電圧となるまで２ｍ秒をかけて電流を制御し、３段階で電圧を上昇、立ち下り時には２ｍ秒をかけて３段階で降下させた。詳細には、最初の１ｍ秒で０．３Ｖ、次の０．７ｍ秒で１．２Ｖ、次の０．３ｍ秒で３．２Ｖのステップで昇圧し、また、立ち下がり時には、同様に、２ｍ秒を掛けて３段階で電圧を降圧した。これを１サイクルとし、交番電界を印加した。評価サンプル数ｎ＝２５で、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。ショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.7 V and the luminance was 915 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, the voltage at the falling edge of the pulse signal is set to -4 V, and at the time of rising, the current is controlled over 2 msec until it reaches the steady state driving current and the stable driving voltage, and the voltage is increased and raised in three stages. When descending, it was lowered in 3 steps over 2 msec. Specifically, the voltage is boosted in steps of 0.3 V in the first 1 msec, 1.2 V in the next 0.7 msec, and 3.2 V in the next 0.3 msec. The voltage was stepped down in three stages taking 2 seconds. This was defined as one cycle, and an alternating electric field was applied. A lighting test was performed for 24 hours with the number of evaluation samples n = 25 and a duty ratio of 10 to 70%. When short-circuit defect was confirmed, no defect occurred.
（第１１の実施の形態）
図１３は、図１に示した有機ＥＬ照明装置の動作の第１１の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Eleventh embodiment)
FIG. 13 is a diagram for explaining the eleventh embodiment of the operation of the organic EL lighting device shown in FIG. 1, and shows the voltage applied to the organic EL light emitting unit 10.
図１３に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、立ち下がり時の電圧を０Ｖまたは接地電位以下としておき、パルス信号の立ち上がりまたは立ち下がり時にパルス信号について第３または第７の実施の形態に示したものと同様の制御を行う。有機材料のキャリア伝導性は、分子間の酸化と還元を繰り返しているが、一方向への継続的な電圧印加は材料の劣化を促進し、有機ＥＬの輝度劣化、電圧上昇の一因となっている。そこで、本形態のように、駆動電圧とは逆極性の電圧を印加しておくことで、電荷蓄積による劣化促進を抑制することができ、長寿命化を図ることができる。また、逆極性の電圧により前のパルス（サイクル）による電荷蓄積が無くなるため、次のパルスによる立ち上がり時の鈍りによる駆動品質低下を防ぐことができる。 As shown in FIG. 13, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, the voltage at the time of falling is set to 0 V or the ground potential or less, and the control similar to that shown in the third or seventh embodiment is performed on the pulse signal at the rising or falling of the pulse signal. I do. The carrier conductivity of organic materials repeats oxidation and reduction between molecules, but continuous application of voltage in one direction promotes deterioration of the material and contributes to deterioration of luminance and voltage increase of organic EL. ing. Therefore, as in this embodiment, by applying a voltage having a polarity opposite to that of the drive voltage, deterioration promotion due to charge accumulation can be suppressed, and a longer life can be achieved. In addition, since charge accumulation due to the previous pulse (cycle) is eliminated due to the reverse polarity voltage, it is possible to prevent a decrease in drive quality due to dullness at the rising edge due to the next pulse.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、立ち下がり時の電圧を−４Ｖとし、パルス信号の立ち上がり時に、定常時駆動電流、安定駆動電圧となるまで２ｍ秒間１．８Ｖを印加した後、定常時駆動電流、安定駆動電圧となるまで電圧を上昇、立ち下り時には１．８Ｖを２ｍ秒間維持した後、０Ｖ（装置接地電位）まで降下させた。これを１サイクルとし、交番電界を印加した。評価サンプル数ｎ＝２５で、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。ショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady driving current was supplied at 25 A / m 2 , the steady driving voltage was 4.8 V and the luminance was 920 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, the voltage at the falling time is set to -4 V, and at the rising edge of the pulse signal, 1.8 V is applied for 2 msec until the steady driving voltage and the stable driving voltage are obtained, and then the steady driving voltage and the stable driving voltage are applied. The voltage was increased until the voltage reached and maintained at 1.8 V for 2 msec at the time of falling, and then decreased to 0 V (device ground potential). This was defined as one cycle, and an alternating electric field was applied. A lighting test was performed for 24 hours with the number of evaluation samples n = 25 and a duty ratio of 10 to 70%. When short-circuit defect was confirmed, no defect occurred.
（第１２の実施の形態）
図１４は、図１に示した有機ＥＬ照明装置の動作の第１２の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Twelfth embodiment)
FIG. 14 is a diagram for explaining the twelfth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１４に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、立ち下がり時の電圧を０Ｖまたは接地電位以下としておき、パルス信号の立ち上がりまたは立ち下がり時にパルス信号について第４または第８の実施の形態に示したものと同様の制御を行う。有機材料のキャリア伝導性は、分子間の酸化と還元を繰り返しているが、一方向への継続的な電圧印加は材料の劣化を促進し、有機ＥＬの輝度劣化、電圧上昇の一因となっている。そこで、本形態のように、駆動電圧とは逆極性の電圧を印加しておくことで、電荷蓄積による劣化促進を抑制することができ、長寿命化を図ることができる。また、逆極性の電圧により前のパルス（サイクル）による電荷蓄積が無くなるため、次のパルスによる立ち上がり時の鈍りによる駆動品質低下を防ぐことができる。 As shown in FIG. 14, in the present embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, the voltage at the time of falling is set to 0 V or the ground potential or less, and the control similar to that shown in the fourth or eighth embodiment is performed on the pulse signal at the rising or falling of the pulse signal. I do. The carrier conductivity of organic materials repeats oxidation and reduction between molecules, but continuous application of voltage in one direction promotes deterioration of the material and contributes to deterioration of luminance and voltage increase of organic EL. ing. Therefore, as in this embodiment, by applying a voltage having a polarity opposite to that of the drive voltage, deterioration promotion due to charge accumulation can be suppressed, and a longer life can be achieved. In addition, since charge accumulation due to the previous pulse (cycle) is eliminated due to the reverse polarity voltage, it is possible to prevent a decrease in drive quality due to dullness at the rising edge due to the next pulse.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．７Ｖ、輝度は９１０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、パルス信号の立ち下がり時の電圧を−５Ｖとし、パルス信号の立ち上がり時に、電流を制御することにより定常時駆動電流、安定駆動電圧となるまで指数関数波形となるよう２ｍ秒をかけて上昇させ、または立ち下がり時に２ｍ秒を掛けて同様な波形で電圧を降下させ、これを１サイクルとし、交番電界を印加した。評価サンプル数ｎ＝２５で、Ｄｕｔｙ比１０〜７０％で２４時間点灯試験を行った。ショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.7 V and the luminance was 910 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, the voltage at the falling edge of the pulse signal is set to -5 V, and at the rising edge of the pulse signal, the current is controlled so that an exponential function waveform is obtained until a steady driving voltage and a stable driving voltage are obtained. The voltage was dropped with a similar waveform by applying 2 msec at the time of falling, and this was taken as one cycle, and an alternating electric field was applied. A lighting test was performed for 24 hours with the number of evaluation samples n = 25 and a duty ratio of 10 to 70%. When short-circuit defect was confirmed, no defect occurred.
（第１３の実施の形態）
図１５は、図１に示した有機ＥＬ照明装置の動作の第１３の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Thirteenth embodiment)
FIG. 15 is a diagram for explaining the thirteenth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１５に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、有機ＥＬ発光部１０の正負極にともにプラス電圧を印加しておき、有機ＥＬ発光部１０を発光させる際に、負極に印加している電圧をゼロ電位（装置設置電位）または正負極間電位差が点灯電位となるようにすることにより、正負極間に電位差を持たせ、有機ＥＬ素子を発光させる。この立ち下がり時または立ち上がり時に、第５の実施の形態に示したものと同様の制御を行う。通常、有機ＥＬ素子にゼロ電位から正極側にプラス電位を印加すると、有機ＥＬの容量成分があって立ち上がりが遅くなるが、この方式を用いることにより前記現象を防ぐことができ、応答速度を向上することができる。本形態の点灯方式を用いることにより、ＰＷＭ駆動を行った場合においても波形が鈍ることがなく高速応答が可能で、高駆動周波数時においても、また低デューティ駆動時においても良好な点灯を維持できる。そのため、低輝度から高輝度において連続的な調光も可能となる。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 15, in the present embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, a positive voltage is applied to both the positive and negative electrodes of the organic EL light emitting unit 10, and when the organic EL light emitting unit 10 emits light, the voltage applied to the negative electrode is set to zero potential (device installation). Potential) or a potential difference between positive and negative electrodes becomes a lighting potential, thereby causing a potential difference between the positive and negative electrodes to cause the organic EL element to emit light. At the time of falling or rising, the same control as that shown in the fifth embodiment is performed. Normally, when a positive potential is applied to the organic EL element from zero potential to the positive electrode side, there is a capacitance component of the organic EL, and the rise is slowed. By using this method, the above phenomenon can be prevented and the response speed is improved. can do. By using the lighting method of this embodiment, even when PWM driving is performed, the waveform does not become dull and a high-speed response is possible, and good lighting can be maintained even at a high driving frequency and at a low duty driving. . Therefore, continuous light control is possible from low luminance to high luminance. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９１５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、有機ＥＬ素子の正負極にともに＋４．０Ｖを印加し、有機ＥＬ素子を発光させる際に、負極側の電圧を、正負極間が点灯電位差となるよう−０．８Ｖとした。パルス信号の立ち下がり時に、安定駆動電圧となるまで１ｍ秒を掛けて下降させ、または立ち上がり時に１ｍ秒を掛けて電圧を上昇させた。これを１サイクルとし、Ｄｕｔｙ比１０〜８０％で信頼性試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 915 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, when +4.0 V is applied to both the positive and negative electrodes of the organic EL element to cause the organic EL element to emit light, the voltage on the negative electrode side is set to −0.8 V so that the lighting potential difference is between the positive and negative electrodes. . At the fall of the pulse signal, the voltage was lowered by taking 1 msec until a stable driving voltage was reached, or at the rise, the voltage was raised by taking 1 msec. This was defined as one cycle, and a reliability test was performed at a duty ratio of 10 to 80%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
（第１４の実施の形態）
図１６は、図１に示した有機ＥＬ照明装置の動作の第１４の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Fourteenth embodiment)
FIG. 16 is a view for explaining the fourteenth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１６に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、有機ＥＬ発光部１０の正負極にともにプラス電圧を印加しておき、有機ＥＬ発光部１０を発光させる際に、負極に印加している電圧をゼロ電位（装置設置電位）または正負極間電位差が点灯電位となるようにすることにより、正負極間に電位差を持たせ、有機ＥＬ素子を発光させる。この立ち下がり時または立ち上がり時に、第６の実施の形態に示したものと同様の制御を行う。この際、ステップ数（段数）とステップ幅、ステップ高さを可変とし、これらによって充電を制御できる。例えば、立ち上がり初期はステップ幅を大きく、かつステップ高さを小さくし、駆動電圧に近づくに従ってステップ幅を小さく、かつ高さを大きくすれば、電圧の急峻な上昇がなく、電気的短絡による不良を回避することができる。なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 As shown in FIG. 16, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs light control and color adjustment. In the power supply unit 20, a positive voltage is applied to both the positive and negative electrodes of the organic EL light emitting unit 10, and when the organic EL light emitting unit 10 emits light, the voltage applied to the negative electrode is set to zero potential (device installation). Potential) or a potential difference between positive and negative electrodes becomes a lighting potential, thereby causing a potential difference between the positive and negative electrodes to cause the organic EL element to emit light. At the time of falling or rising, the same control as that shown in the sixth embodiment is performed. At this time, the number of steps (the number of steps), the step width, and the step height can be made variable to control charging. For example, if the step width is increased and the step height is decreased at the beginning of the rise, the step width is decreased and the height is increased as the drive voltage is approached. It can be avoided. The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９２０ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、有機ＥＬ素子の正負極にともに＋４．８Ｖを印加し、有機ＥＬ素子を発光させる際に、負極側の電圧を、正負極間が点灯電位差となるよう０Ｖとした。そのパルス信号の立ち下がり時に、定常時駆動電流、安定駆動電圧となるまで１ｍ秒をかけて３段階で電圧を下降、消灯時には１ｍ秒をかけて３段階で上昇させた。詳細には、最初の０．５ｍ秒で−０．３Ｖ、次の０．３５ｍ秒で−１．２Ｖ、次の０．１５ｍ秒で−３．３Ｖのステップで降圧し、また、立ち上がり時には、同様に、１ｍ秒を掛けて３段階で電圧を昇圧した。これを１サイクルとし、Ｄｕｔｙ比１０〜８０％で信頼性試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady driving current was supplied at 25 A / m 2 , the steady driving voltage was 4.8 V and the luminance was 920 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, +4.8 V was applied to both the positive and negative electrodes of the organic EL element, and when the organic EL element was caused to emit light, the voltage on the negative electrode side was set to 0 V so that the lighting potential difference was between the positive and negative electrodes. At the fall of the pulse signal, the voltage was lowered in three stages over 1 msec until it reached a steady-state driving current and a stable driving voltage, and when extinguished, it was raised in 3 stages over 1 msec. Specifically, the voltage is stepped down in steps of -0.3 V in the first 0.5 ms, -1.2 V in the next 0.35 ms, -3.3 V in the next 0.15 ms, Similarly, the voltage was boosted in three stages over 1 msec. This was defined as one cycle, and a reliability test was performed at a duty ratio of 10 to 80%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
（第１５の実施の形態）
図１７は、図１に示した有機ＥＬ照明装置の動作の第１５の実施の形態を説明するための図であり、有機ＥＬ発光部１０に印加される電圧を示す。(Fifteenth embodiment)
FIG. 17 is a view for explaining the fifteenth embodiment of the operation of the organic EL lighting device shown in FIG. 1 and shows the voltage applied to the organic EL light emitting unit 10.
図１７に示すように、本形態においては、制御部３０において、有機ＥＬ発光部１０を発光させるための信号をパルス信号によって電源供給部２０に供給し、調光・調色を行う。そして、電源供給部２０において、有機ＥＬ発光部１０の正負極にともにプラス電圧を印加しておき、有機ＥＬ発光部１０を発光させる際に、負極に印加している電圧をゼロ電位（装置接地電位）または正負極間電位差が点灯電位となるようにすることにより、正負極間に電位差を持たせ、有機ＥＬ素子を発光させる。この立ち下がり時または立ち上がり時に、第８の実施の形態に示したものと同様の制御を行う。通常、有機ＥＬ素子にゼロ電位から正極側にプラス電位を印加すると、有機ＥＬの容量成分があって立ち上がりが遅くなるが、この方式を用いることにより前記現象を防ぐことができ、応答速度を向上することができる。 As shown in FIG. 17, in this embodiment, the control unit 30 supplies a signal for causing the organic EL light emitting unit 10 to emit light to the power supply unit 20 by a pulse signal, and performs dimming and toning. In the power supply unit 20, a positive voltage is applied to both the positive and negative electrodes of the organic EL light emitting unit 10, and when the organic EL light emitting unit 10 emits light, the voltage applied to the negative electrode is set to zero potential (device grounding). Potential) or a potential difference between positive and negative electrodes becomes a lighting potential, thereby causing a potential difference between the positive and negative electrodes to cause the organic EL element to emit light. At the time of falling or rising, the same control as that shown in the eighth embodiment is performed. Normally, when a positive potential is applied to the organic EL element from zero potential to the positive electrode side, there is a capacitance component of the organic EL, and the rise is slowed. By using this method, the above phenomenon can be prevented and the response speed is improved. can do.
なお、有機ＥＬ発光部１０に印加する電圧が安定駆動電圧となるまでの時間は、回路の時定数以上であることが望ましいが、安定電圧時間が短く、例えば６０Ｈｚ以下と周波数が小さくなったときにフリッカとして認識される場合があるので、突入電流を防ぐだけの充電量があればよい。 The time until the voltage applied to the organic EL light emitting unit 10 becomes the stable driving voltage is preferably equal to or greater than the circuit time constant, but the stable voltage time is short, for example, when the frequency is reduced to 60 Hz or less. May be recognized as flicker, so that it is sufficient to have an amount of charge sufficient to prevent inrush current.
第１の実施の形態と同じ構成の素子を作製し、定常時駆動電流を２５Ａ／ｍ2流したところ、定常時における駆動電圧は４．８Ｖ、輝度は９１５ｃｄ／ｍ2であった。この有機ＥＬ照明点灯装置を調光するために、パルス幅変調駆動を行った。具体的には、有機ＥＬ素子の正負極にともに＋４．０Ｖを印加し、有機ＥＬ素子を発光させる際に、負極側の電圧を、正負極間が点灯電位差となるよう−０．８Ｖとした。パルス信号の立ち下がり時に、安定駆動電圧となるまで１ｍ秒を掛けて下降させ、または立ち上がり時に１ｍ秒を掛けて電圧を上昇させた。これを１サイクルとし、Ｄｕｔｙ比１０〜８０％で信頼性試験を行った。評価サンプル数ｎ＝２５でショート不良を確認したところ、不良は発生しなかった。When an element having the same configuration as that of the first embodiment was manufactured and a steady-state drive current was supplied at 25 A / m 2 , the steady-state drive voltage was 4.8 V and the luminance was 915 cd / m 2 . In order to dimm this organic EL illumination lighting device, pulse width modulation driving was performed. Specifically, when +4.0 V is applied to both the positive and negative electrodes of the organic EL element to cause the organic EL element to emit light, the voltage on the negative electrode side is set to −0.8 V so that the lighting potential difference is between the positive and negative electrodes. . At the fall of the pulse signal, the voltage was lowered by taking 1 msec until a stable driving voltage was reached, or at the rise, the voltage was raised by taking 1 msec. This was defined as one cycle, and a reliability test was performed at a duty ratio of 10 to 80%. When a short defect was confirmed with the number of evaluation samples n = 25, no defect occurred.
以上、上記各実施の形態を参照して本願発明を説明したが、本願発明は上記各実施の形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 While the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
この出願は、２０１１年７月２８日に出願された日本出願特願２０１１−１６５０６４を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2011-165064 for which it applied on July 28, 2011, and takes in those the indications of all here.
本発明の活用例としては、有機ＥＬ一般用照明装置、液晶ディスプレイ等のバックライト等が挙げられる。 Examples of utilization of the present invention include backlights for organic EL general illumination devices and liquid crystal displays.
Claims (5)
前記電源供給部は、電源投入時または電源切断時に、前記発光素子部に印加する電圧を段階的またはステップ状に上昇または降下させる制御を行い、電源投入初期は、前記段階的またはステップ状のステップ幅を大きく、かつステップ高さを小さくし、前記発光素子部が駆動する駆動電圧に近づくに従って前記ステップ幅を小さく、かつ前記ステップ高さを大きくすることを特徴とする有機ＥＬ照明装置。 A light-emitting element portion whose luminance changes in accordance with the magnitude of the current; a power supply portion for controlling the current to apply a voltage to the light-emitting element portion; and a signal for causing the light-emitting element portion to emit light. An organic EL lighting device that applies a voltage to the light emitting element unit by controlling a current according to a signal given from the control unit,
The power supply unit performs control to increase or decrease the voltage applied to the light emitting element unit stepwise or stepwise when the power is turned on or off, and the initial stage of power-on is the stepped or stepped step. An organic EL lighting device, wherein the width is increased and the step height is decreased, and the step width is decreased and the step height is increased as approaching a driving voltage driven by the light emitting element portion.
前記電源供給部は、前記段階的またはステップ状のステップ数とステップ幅とステップ高さとが可変である有機ＥＬ照明装置。 The organic EL lighting device according to claim 1,
The power supply unit is an organic EL lighting device in which the number of steps, the step width, and the step height in steps or steps are variable.
前記制御部は、前記発光素子部を発光させるための信号をパルス信号によって前記電源供給部に供給し、
前記電源供給部は、前記パルス信号の立ち上がりまたは立ち下がり時に当該パルス信号について前記制御を行う有機ＥＬ照明装置。 The organic EL lighting device according to claim 1 or 2 ,
The control unit supplies a signal for causing the light emitting element unit to emit light to the power supply unit by a pulse signal,
The organic EL lighting device, wherein the power supply unit performs the control on the pulse signal when the pulse signal rises or falls.
前記電源供給部は、立ち下がり時の電圧を０Ｖまたはグランド電位以下とする有機ＥＬ照明装置。 The organic EL lighting device according to claim 3 .
The power supply unit is an organic EL lighting device in which a voltage at the time of falling is set to 0 V or a ground potential or less.
前記電源供給部は、前記発光素子部の正負極にともにプラス電圧を印加しておき、前記発光素子部を発光させる際に、前記発光素子部の負極に印加している電圧を低下させることにより前記正負極間に電位差を生じさせる有機ＥＬ照明装置。 The organic EL lighting device according to claim 3 .
The power supply unit applies a positive voltage to both the positive and negative electrodes of the light emitting element unit, and reduces the voltage applied to the negative electrode of the light emitting element unit when the light emitting element unit emits light. An organic EL lighting device that generates a potential difference between the positive and negative electrodes.
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