JP2011107290A - Device and method for driving organic el panel - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 230000002441 reversible effect Effects 0.000 description 24
- 239000010410 layer Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、支持基板上に一対の電極間に有機発光層を狭持してなる有機EL素子を備える有機ELパネルの駆動装置及び駆動方法に関するものである。 The present invention relates to a driving apparatus and a driving method for an organic EL panel including an organic EL element in which an organic light emitting layer is sandwiched between a pair of electrodes on a support substrate.
従来、有機ELパネルとしては、例えば、少なくとも有機発光層を有する有機層をITO(Indium Tin Oxide)等からなる陽極(第一電極)と、アルミニウム(Al)等からなる陰極(第二電極)とで狭持してなる有機EL素子を発光画素として透光性の支持基板上にマトリクス状に形成して発光表示部を構成するものが知られている(例えば特許文献1参照)。かかる有機EL素子は、陽極から正孔を注入し、また、陰極から電子を注入して正孔及び電子が有機発光層にて再結合することによって光を発するものである。また、有機EL素子は、陰極側から陽極側へは電流が流れにくい、いわゆるダイオード特性を有するものである。 Conventionally, as an organic EL panel, for example, an organic layer having at least an organic light emitting layer includes an anode (first electrode) made of ITO (Indium Tin Oxide) or the like, and a cathode (second electrode) made of aluminum (Al) or the like. A light-emitting display unit is known in which an organic EL element sandwiched between two layers is formed as a light-emitting pixel in a matrix on a light-transmitting support substrate (see, for example, Patent Document 1). Such an organic EL element emits light by injecting holes from the anode and injecting electrons from the cathode, and the holes and electrons recombine in the organic light emitting layer. The organic EL element has a so-called diode characteristic in which current does not easily flow from the cathode side to the anode side.
上記のような有機ELパネルは、例えば陽極をデータラインとし陰極をコモンラインとするパッシブ駆動(線順次駆動)によって有機EL素子の発光を制御するパッシブマトリクス型の有機ELパネルである。 The organic EL panel as described above is, for example, a passive matrix organic EL panel that controls light emission of the organic EL element by passive driving (line-sequential driving) in which an anode is a data line and a cathode is a common line.
ここで、有機EL素子は、パッシブマトリクス型の有機ELパネルにおいては、一定電流にて連続して発光させると発光輝度が経時的に減衰することが知られており、各有機EL素子の使用頻度に差があった場合、焼き付きや輝度ムラが発生し表示品質が低下するという問題点があった。これに対し、特許文献2に開示されるように、有機EL素子の点灯後のタイミングで輝度を回復させるような電圧を印加する方法などが知られている。
Here, it is known that the organic EL element is a passive matrix type organic EL panel, and when the light is continuously emitted at a constant current, the light emission luminance is attenuated with time. If there is a difference between the two, there is a problem that image sticking and luminance unevenness occur and display quality deteriorates. On the other hand, as disclosed in
しかしながら、特許文献2に開示される方法は、輝度を回復させるような電圧の印加や有機EL素子に蓄えられた電荷をリセットするタイミングは規定されているものの、輝度を回復し得るために必要な電圧印加条件が明らかでなく、輝度を回復するという効果を確実に得ることができないという問題点があった。
However, the method disclosed in
そこで本発明は、前述の問題点に鑑み、より確実に有機EL素子の輝度を回復させることができ、経時的に安定性の高い有機ELパネルの駆動装置及び駆動方法を提供することを目的とするものである。 SUMMARY OF THE INVENTION In view of the above-described problems, the present invention has an object to provide a driving device and a driving method for an organic EL panel that can more reliably recover the luminance of an organic EL element and that is highly stable over time. To do.
本発明は、前記課題を解決するため、支持基板上に一対の電極間に有機発光層を狭持してなる有機EL素子を備え、前記両電極間に駆動電圧を印加して前記有機EL素子を点灯させ、前記有機EL素子の非点灯時に前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間と前記両電極間の電位差が発光開始電圧の絶対値未満である期間とを設けてなる有機ELパネルの駆動装置であって、前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも30%以上とすることを特徴とする。 In order to solve the above-described problems, the present invention includes an organic EL element in which an organic light emitting layer is sandwiched between a pair of electrodes on a support substrate, and a driving voltage is applied between the electrodes to apply the organic EL element. A period in which a voltage opposite to the driving voltage is applied between the electrodes when the organic EL element is not lit, and a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage. An organic EL panel driving device provided, wherein a potential difference between the electrodes is less than an absolute value of the light emission start voltage during a period in which a voltage opposite to the driving voltage is applied between the electrodes. It is characterized by being at least 30% or more with respect to the period.
また、前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が発光開始電圧の絶対値未満である期間に対して少なくとも100%以上とすることを特徴とする。 Further, a period during which a voltage opposite to the driving voltage is applied between the electrodes is set to at least 100% or more with respect to a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage. Features.
また、前記両電極間の電位差が発光開始電圧の絶対値未満である期間において前記両電極間を同電位とすることを特徴とする。 Further, the electrodes are set to the same potential during a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage.
また、複数の前記有機EL素子を備え、前記各有機EL素子をパッシブ駆動にて点灯させることを特徴とする。 In addition, a plurality of the organic EL elements are provided, and each of the organic EL elements is lit by passive driving.
本発明は、前記課題を解決するために、支持基板上に一対の電極間に有機発光層を狭持してなる有機EL素子を備え、前記両電極間に駆動電圧を印加して前記有機EL素子を点灯させ、前記有機EL素子の非点灯時に前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間と前記両電極間の電位差が発光開始電圧の絶対値未満である期間とを設ける有機ELパネルの駆動方法であって、前記前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも30%以上とすることを特徴とする。 In order to solve the above-described problems, the present invention includes an organic EL element in which an organic light emitting layer is sandwiched between a pair of electrodes on a support substrate, and a driving voltage is applied between the electrodes to apply the organic EL element. A period in which the element is turned on and a voltage in the direction opposite to the drive voltage is applied between the electrodes when the organic EL element is not lit, and a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage; A method of driving an organic EL panel in which a voltage difference between the electrodes in a direction opposite to the drive voltage is applied between the electrodes, and a potential difference between the electrodes is less than an absolute value of the light emission start voltage. It is characterized by being at least 30% or more with respect to the period.
また、前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも100%以上とすることを特徴とする。 In addition, a period in which a voltage in the direction opposite to the driving voltage is applied between the electrodes is set to at least 100% or more with respect to a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage. It is characterized by.
また、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間において前記両電極間を同電位とすることを特徴とする。 Further, the electrodes are set to the same potential during a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage.
また、複数の前記有機EL素子を備え、前記各有機EL素子をパッシブ駆動にて点灯させることを特徴とする。 In addition, a plurality of the organic EL elements are provided, and each of the organic EL elements is lit by passive driving.
本発明は、前記有機EL素子の輝度寿命に影響を及ぼす前記駆動電圧とは逆方向の電圧を印加する期間を前記両電極間の電位差が発光開始電圧の絶対値未満である期間に対して少なくとも30%以上と規定することによって、輝度の回復がより確実に得られるようにして高信頼性が要求される場合でも経時的輝度劣化が少ない表示品位の高い有機ELパネルの駆動装置及び駆動方法を実現することができる。 The present invention provides at least a period in which a voltage in the direction opposite to the drive voltage that affects the luminance life of the organic EL element is applied to a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage. A driving device and a driving method for an organic EL panel with high display quality with little deterioration in luminance over time even when high reliability is required so that luminance recovery can be obtained more reliably by specifying 30% or more Can be realized.
また、前記駆動電圧と逆方向の電圧が印加される期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも100%以上とすることで、より効率よく輝度の回復を得ることができる。 Further, the period during which the voltage in the direction opposite to the driving voltage is applied is at least 100% or more with respect to the period in which the potential difference between the two electrodes is less than the absolute value of the light emission start voltage. Brightness recovery can be obtained.
本発明によれば、より確実に有機EL素子の輝度を回復させることができ、経時的に安定性を高めることが可能となる。 According to the present invention, the luminance of the organic EL element can be recovered more reliably, and the stability can be improved over time.
以下、本発明の実施形態である有機ELパネルの駆動装置を添付図面に基づき説明する。 Hereinafter, an organic EL panel driving apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
図1に示すように、有機ELパネル1の駆動装置は、有機ELパネル1と、陰極駆動回路2と、陽極駆動回路3と、表示コントローラ4と、を有している。
As shown in FIG. 1, the drive device for the
有機ELパネル1は、支持基板上に陽極と陰極との間に有機発光層を狭持してなる有機EL素子である画素E11〜Emnがマトリクス状に配置されてなるものである。画素E11〜Emnは、横方向に複数設けられ陰極となる走査ラインS1〜Smと、走査ラインS1〜Smと直交するように複数設けられ陽極となるドライブラインD1〜Dnとの交差位置に設けられている。画素E11〜Emnは、並列配置されたダイオード成分及び寄生容量成分からなる等価回路で表されるが、図面が煩雑になることを防ぐため、図1においては画素E11〜Emnをダイオードのみで図示している。
The
陰極駆動回路2は、各走査ラインS1〜Smに対応する複数の走査スイッチ21〜2mを備えている。走査スイッチ21〜2mは、表示コントローラ4からの制御信号に基づいて、各走査ラインS1〜Smを選択的にコモン電位Vcまたはアース電位(0V)に接続するものである。各走査ラインS1〜Smは1フレーム期間において順次選択され、選択される走査ラインS1〜Smはアース電位となり、選択されない走査ラインS1〜Smはコモン電位Vcとなる。なおコモン電位Vcは、後述する定電流源Aから印加される駆動電圧との電位差が画素E11〜Enmの発光開始電圧の絶対値未満となるように設定されるものであり、望ましくは前記駆動電圧と同電位に設定されるものである。
The
陽極駆動回路3は、各ドライブラインD1〜Dnに対応して個々に駆動電流を供給する定電流源Aと、この定電流源Aからの駆動電流を各ドライブラインD1〜Dnに接続可能とするドライブスイッチ31〜3nとから構成される。各ドライブスイッチ31〜3nの切換えは、表示コントローラ4からの制御信号に基づいて決定される。
The
表示コントローラ4は、走査スイッチ21〜2mを順次オンさせて走査ラインS1〜Smを順次走査すると共に各ドライブスイッチ31〜3nをオン/オフさせるパッシブ駆動を行うことによって、画像データに基づいて有機ELパネル1に文字,図形等を表示させる。
The
次に、有機ELパネル1の駆動方法について、1フレーム期間において走査ラインS1とドライブラインD1とに接続される画素E11を点灯させる場合を例に上げて説明する。図2は、走査ラインS1〜Sm及びドライブラインD1の駆動波形を示すものである。
Next, a method for driving the
1フレーム期間において、走査ラインS1〜Smは、走査ラインS1から順次選択され、選択時にアース電位となり、非選択時にコモン電位Vcとなる。ドライブラインD1は、走査ラインS1〜Smの選択時に定電流源Aと接続され、走査ラインS1〜Smの選択が切り替わる間に所定期間アース電位と接続される。このとき、走査ラインS1が選択され、かつドライブラインD1が定電流源Aに接続される期間t1においては両電極ラインS1,D1間に順方向の駆動電圧が印加され画素E11が点灯する。また、走査ラインS1が非選択であり、かつドライブラインD1がアース電位である期間t2においては両電極ラインS1,D1間に前記駆動電圧とは逆方向の電圧(以下、逆バイアス電圧という)Vcが印加され画素E11は非点灯となる。また、走査ラインS1が非選択であり、かつドライブラインD1が定電流源Aと接続される期間t3においては画素E11は非点灯であり両電極ラインS1,D1間の電位差は発光開始電圧の絶対値未満となり画素E11は非点灯となる。なお、他の画素E12〜Enmを点灯する際においても同様に各期間t1〜t3が設けられる。 In one frame period, the scanning lines S1 to Sm are sequentially selected from the scanning line S1, and become the ground potential when selected, and become the common potential Vc when not selected. The drive line D1 is connected to the constant current source A when the scanning lines S1 to Sm are selected, and is connected to the ground potential for a predetermined period while the selection of the scanning lines S1 to Sm is switched. At this time, during a period t1 in which the scanning line S1 is selected and the drive line D1 is connected to the constant current source A, a forward drive voltage is applied between the electrode lines S1 and D1, and the pixel E11 is lit. In the period t2 in which the scanning line S1 is not selected and the drive line D1 is at the ground potential, a voltage Vc (hereinafter referred to as a reverse bias voltage) Vc opposite to the drive voltage is applied between the electrode lines S1 and D1. Is applied, and the pixel E11 is not lit. In the period t3 when the scanning line S1 is not selected and the drive line D1 is connected to the constant current source A, the pixel E11 is not lit, and the potential difference between the electrode lines S1 and D1 is the absolute value of the light emission start voltage. It becomes less than the value, and the pixel E11 is not lit. Similarly, when the other pixels E12 to Enm are lit, the periods t1 to t3 are provided.
本実施形態の特徴とするところは、期間t2と期間t3との比を適宜調整し、1フレーム期間において両電極ラインS1〜Sm,D1〜Dn間に逆バイアス電圧Vcが印加される期間t2を、両電極ラインS1〜Sm,D1〜Dn間の電位差が前記発光開始電圧の絶対値未満である期間t3に対して少なくとも30%以上(t2/t3≧0.3)とする点にある。 The feature of this embodiment is that the ratio between the period t2 and the period t3 is adjusted as appropriate, and the period t2 in which the reverse bias voltage Vc is applied between the electrode lines S1 to Sm and D1 to Dn in one frame period. In addition, the potential difference between the electrode lines S1 to Sm and D1 to Dn is at least 30% (t2 / t3 ≧ 0.3) with respect to the period t3 in which the light emission start voltage is less than the absolute value.
ここで、一般に有機ELパネルの製造工程において両電極間に逆バイアス電圧を印加する逆バイアス通電処理を行い、その後有機ELパネルを両電極間の電位差を発光開始電圧の絶対値未満とした状態で所定時間放置した場合の有機EL素子の輝度は、図3に示すように発光初期に減衰しその後安定することが知られている。かかる特性は60℃程度以上の高温環境下で放置した場合に特に顕著に表れるものであり、図3においては85℃の温度環境下で放置した場合を示している。一方、製造工程においては逆バイアス通電処理を行わず、製造後に所定時間逆バイアス電圧を印加した場合の有機EL素子の輝度は、図4に示すように発光初期に大きく上昇しその後安定することが知られている。これは、放置時に有機EL素子の両電極間の電位差を発光開始電圧の絶対値未満とすると有機分子が比較的容易に熱的に安定した状態となるが、安定状態から逆バイアス電圧を印加した時には両電極間の電位差により有機分子が熱的に活性した状態に変化するためと推測される。 Here, in general, in the manufacturing process of the organic EL panel, a reverse bias energization process is performed in which a reverse bias voltage is applied between both electrodes, and then the organic EL panel is in a state where the potential difference between the electrodes is less than the absolute value of the light emission start voltage. It is known that the luminance of the organic EL element when left for a predetermined time is attenuated at the beginning of light emission and then stabilized as shown in FIG. Such characteristics are particularly prominent when left in a high temperature environment of about 60 ° C. or higher, and FIG. 3 shows a case where it is left in a temperature environment of 85 ° C. On the other hand, the luminance of the organic EL element when the reverse bias energization process is not performed in the manufacturing process and the reverse bias voltage is applied for a predetermined time after the manufacturing can be greatly increased in the initial stage of light emission and then stabilized as shown in FIG. Are known. This is because when the potential difference between the two electrodes of the organic EL element is less than the absolute value of the light emission starting voltage when left standing, the organic molecules are relatively easily thermally stabilized, but a reverse bias voltage is applied from the stable state. It is presumed that the organic molecules sometimes change to a thermally activated state due to the potential difference between the electrodes.
本願発明者は、かかる特性が放置状態と逆バイアス電圧印加を交互に繰り返した場合にも観測され、ほぼ可逆的な振る舞いをすることを実験により確認した(図5参照)。なお、放置は85℃の温度環境下で行った。図5において有機EL素子の輝度は、放置時に減衰し逆バイアス電圧印加時に上昇する。これにより、ある一定の輝度で発光する有機ELパネルの輝度寿命は、発光時間だけでなく、上述のような発光駆動の各フレーム期間における放置時間及び逆バイアス電圧印加時間によっても変化することが確認された。 The inventor of the present application has confirmed that such a characteristic is observed even when the neglected state and reverse bias voltage application are alternately repeated, and it has been confirmed by an experiment that the behavior is almost reversible (see FIG. 5). The standing was performed under a temperature environment of 85 ° C. In FIG. 5, the luminance of the organic EL element attenuates when left unattended and increases when a reverse bias voltage is applied. As a result, it has been confirmed that the luminance life of an organic EL panel that emits light with a certain luminance changes not only with the light emission time but also with the standing time and the reverse bias voltage application time in each frame period of light emission driving as described above. It was done.
次に、本願発明者は、放置時間及び逆バイアス電圧印加時間が発光寿命にどの程度影響を及ぼしているかを詳細に調べるため、本実施形態において両電極ラインS1〜Sm,D1〜Dn間の電位差が前記発光開始電圧の絶対値未満である期間t3と両電極ラインS1〜Sm,D1〜Dn間に逆バイアス電圧Vcが印加される期間t2の比率を変化させて有機ELパネル1を85℃の温度環境下で駆動させた場合の寿命特性を調べた。図6は、全画素E11〜Enmを点灯させる場合の期間t3に対する期間t2の比率と輝度寿命(初期輝度比80%到達時間)との関係を示したものである。なお、期間t3においては両電極ラインS1〜Sm,D1〜Dn間が同電位となるようにした。図6によれば、期間t3に対する期間t2の比率が30〜60%近辺にかけて輝度寿命が大きく改善されていることがわかる。このような特性を示す理由としては以下のように考えられる。前述のように、有機EL素子である画素E11〜Enmは、放置時では輝度劣化を示す一方、逆バイアス電圧Vc印加時は輝度が回復する。したがって放置時間である期間t3に対する逆バイアス電圧印加時間である期間t2の比率が小さい場合は、放置による輝度劣化の速度が逆バイアス電圧Vcの印加による輝度回復の速度を上回るため、有機ELパネル1の輝度寿命は短くなる。図6においては、期間t3に対する期間t2の比率が30%未満である領域がこれに該当する。これに対し、期間t3に対する期間t2の比率がさらに大きくなると、放置による輝度劣化の速度より逆バイアス電圧Vcの印加による輝度回復の速度が大きくなる。したがって、期間t3に対する期間t2の比率が大きくなるにつれ有機ELパネル1の輝度寿命は次第に長くなる。図6では期間t3に対する期間t2の比率が30〜60%程度の領域がこれに該当する。また、期間t3に対する期間t2の比率がさらに大きくなると、放置による輝度劣化の速度よりも逆バイアス電圧Vcの印加による輝度回復の速度がさらに大きくなる。しかしながら、図4で示したように画素E11〜Emnの輝度はある程度回復した後は一定となるため、その後は期間t3に対する期間t2の比率を大きくしてもそれ以上輝度寿命は改善されるほぼ一定となる。図6では期間t3に対する期間t2の比率が60%以上の領域がこれに該当する。
Next, in order to investigate in detail how much the standing time and the reverse bias voltage application time have an influence on the light emission lifetime, the inventor of the present application has a potential difference between the electrode lines S1 to Sm and D1 to Dn in this embodiment. The ratio of the period t3 during which the reverse bias voltage Vc is applied between the electrode lines S1 to Sm and D1 to Dn is changed to 85 ° C. The life characteristics when driven in a temperature environment were investigated. FIG. 6 shows the relationship between the ratio of the period t2 to the period t3 and the luminance life (initial luminance ratio arrival time of 80%) when all the pixels E11 to Enm are turned on. In the period t3, both electrode lines S1 to Sm and D1 to Dn are set to the same potential. According to FIG. 6, it can be seen that the luminance life is greatly improved when the ratio of the period t2 to the period t3 is around 30 to 60%. The reason for exhibiting such characteristics is considered as follows. As described above, the pixels E11 to Enm, which are organic EL elements, exhibit luminance degradation when left standing, while the luminance recovers when the reverse bias voltage Vc is applied. Accordingly, when the ratio of the period t2 that is the reverse bias voltage application time to the period t3 that is the neglected time is small, the speed of luminance deterioration due to neglecting exceeds the speed of the luminance recovery by applying the reverse bias voltage Vc. The luminance life of the is shortened. In FIG. 6, this corresponds to the region where the ratio of the period t2 to the period t3 is less than 30%. On the other hand, when the ratio of the period t2 to the period t3 is further increased, the speed of luminance recovery by application of the reverse bias voltage Vc is higher than the speed of luminance deterioration due to being left. Therefore, as the ratio of the period t2 to the period t3 increases, the luminance life of the
図6からも明らかなように、本実施形態のように有機ELパネル1の駆動装置及び駆動方法において、両電極ラインS1〜Sm,D1〜Dn間に逆バイアス電圧Vcが印加される期間t2を、両電極ラインS1〜Sm,D1〜Dn間の電位差が前記発光開始電圧の絶対値未満である期間t3に対して少なくとも30%以上することによって、画素E11〜Enmの輝度を回復させ、高信頼性が要求される場合でも有機ELパネル1の輝度寿命を改善して経時的な安定性を高めることが可能となる。また、より確実に輝度を回復させるには、期間t2の期間t3に対する比率を60%以上とし、さらに効率的に輝度を回復させるには、期間t2の期間t3に対する比率を100%以上とすることが望ましい。
As apparent from FIG. 6, in the driving apparatus and driving method for the
図7は、85℃の温度環境下で本発明の駆動方法を実施した実施例1,2の輝度寿命の測定結果を示したものである。実施例1としては、両電極ラインS1〜Sm,D1〜Dn間の電位差が前記発光開始電圧の絶対値未満である期間t3に対する両電極ラインS1〜Sm,D1〜Dn間に逆バイアス電圧Vcが印加される期間t2の比率を30%程度とした。実施例1は、輝度寿命が約2000時間程度であった。実施例2としては、両電極ラインS1〜Sm,D1〜Dn間の電位差が前記発光開始電圧の絶対値未満である期間t3に対する両電極ラインS1〜Sm,D1〜Dn間に逆バイアス電圧Vcが印加される期間t2の比率を60%程度とした。実施例2は、輝度寿命が約2500時間以上であった。本発明の駆動方法を実施した実施例1,2は、輝度寿命が約2000時間以上となり、明らかに寿命が改善された。本発明を実施することにより経時的な安定性を高めることができることは図7からも明らかである。 FIG. 7 shows the measurement results of the luminance life of Examples 1 and 2 in which the driving method of the present invention was performed in a temperature environment of 85 ° C. In Example 1, the reverse bias voltage Vc is applied between the electrode lines S1 to Sm and D1 to Dn for the period t3 in which the potential difference between the electrode lines S1 to Sm and D1 to Dn is less than the absolute value of the light emission start voltage. The ratio of the applied period t2 was about 30%. In Example 1, the luminance life was about 2000 hours. In Example 2, the reverse bias voltage Vc is applied between the electrode lines S1 to Sm and D1 to Dn for the period t3 in which the potential difference between the electrode lines S1 to Sm and D1 to Dn is less than the absolute value of the light emission start voltage. The ratio of the applied period t2 was about 60%. In Example 2, the luminance life was about 2500 hours or more. In Examples 1 and 2 in which the driving method of the present invention was implemented, the luminance life was about 2000 hours or more, and the life was clearly improved. It is clear from FIG. 7 that the stability over time can be improved by implementing the present invention.
本発明は、有機ELパネルの駆動装置及び駆動方法に関し、特にパッシブ駆動の有機ELパネルの駆動装置及び駆動方法に好適である。 The present invention relates to an organic EL panel driving apparatus and driving method, and is particularly suitable for a passive driving organic EL panel driving apparatus and driving method.
1 有機ELパネル
2 陰極駆動回路
3 陽極駆動回路
4 表示コントローラ
1
Claims (8)
前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも30%以上とすることを特徴とする有機ELパネルの駆動装置。 An organic EL element having an organic light emitting layer sandwiched between a pair of electrodes on a support substrate, a driving voltage is applied between the electrodes to light the organic EL element, and the organic EL element is not lit An organic EL panel drive device comprising a period in which a voltage opposite to the drive voltage is applied between the electrodes and a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage. And
A period in which a voltage opposite to the driving voltage is applied between the electrodes is set to at least 30% or more of a period in which a potential difference between the electrodes is less than an absolute value of the light emission start voltage. An organic EL panel drive device.
前記前記両電極間に前記駆動電圧とは逆方向の電圧を印加する期間を、前記両電極間の電位差が前記発光開始電圧の絶対値未満である期間に対して少なくとも30%以上とすることを特徴とする有機ELパネルの駆動方法。 An organic EL element having an organic light emitting layer sandwiched between a pair of electrodes on a support substrate, a driving voltage is applied between the electrodes to light the organic EL element, and the organic EL element is not lit A method for driving an organic EL panel, which sometimes includes a period in which a voltage opposite to the driving voltage is applied between the electrodes and a period in which the potential difference between the electrodes is less than the absolute value of the light emission start voltage,
A period during which a voltage in the direction opposite to the drive voltage is applied between the electrodes is set to at least 30% or more with respect to a period in which a potential difference between the electrodes is less than an absolute value of the light emission start voltage. A method for driving an organic EL panel, which is characterized.
The organic EL panel driving method according to claim 5, comprising a plurality of the organic EL elements, and lighting each of the organic EL elements by passive driving.
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