JP2007122982A - Illumination device - Google Patents

Illumination device Download PDF

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JP2007122982A
JP2007122982A JP2005311974A JP2005311974A JP2007122982A JP 2007122982 A JP2007122982 A JP 2007122982A JP 2005311974 A JP2005311974 A JP 2005311974A JP 2005311974 A JP2005311974 A JP 2005311974A JP 2007122982 A JP2007122982 A JP 2007122982A
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light emitting
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series circuit
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emitting unit
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JP4665715B2 (en
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Minoru Maehara
稔 前原
Tomoyuki Nakano
智之 中野
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device capable of preventing the deterioration or destruction of a remaing element in the case that one part of an organic EL element is broken. <P>SOLUTION: A first light emitting part 1 and a second light emitting part 2 are connected in parallel via a current-limiting element 3 at both ends of an alternate current power supply PS, the first light emitting part 1 is composed of a series circuit in which four organic EL elements 5 are connected in series by making a forward direction the same, a resistance 4 connected to the series circuit in parallel, and a rectifier element 6 connected in series to the series circuit by making the forward direction the same, the second light emitting part 2 is composed of the series circuit in which four organic EL elements 5 are connected in series by making the forward direction the same, the resistance 4 connected to the series circuit in parallel, and the rectifier element 6 connected in series to the series circuit by making the forward direction the same, and the first light emitting part 1 and the second light emitting part 2 are connected with the purpose of making the forward direction mutually opposite. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、有機ＥＬ素子を光源とする照明装置に関する。   The present invention relates to an illumination device using an organic EL element as a light source.

近年、薄型の固体発光素子として有機ＥＬ素子の研究が盛んである。有機ＥＬ素子は、有機化合物から成る薄膜の発光層を電極で挟持した構成で、電極間に電圧を供給すると発光する素子である。有機ＥＬ素子は薄型かつ軽量の発光素子を構成でき、また駆動電圧が数Ｖから十数Ｖ程度と従来主流の光源である放電灯と比べて駆動電圧が低いため、点灯装置を安価に構成でき、薄型かつ軽量の照明器具への応用が期待できる。従来の有機ＥＬ素子を用いた照明装置として、２つの有機ＥＬ素子を互いに順方向が逆向きとなるように並列に接続し、これら有機ＥＬ素子に順方向電圧及び逆方向電圧を交互に印加することで有機ＥＬ素子の寿命を長くするものが特許文献１に記載されている。   In recent years, organic EL devices have been actively studied as thin solid-state light emitting devices. An organic EL device is a device in which a thin light emitting layer made of an organic compound is sandwiched between electrodes, and emits light when a voltage is supplied between the electrodes. The organic EL element can constitute a light-emitting element that is thin and lightweight, and the driving voltage is about several to several tens of volts, which is lower than that of a discharge lamp that is a conventional mainstream light source. Application to thin and lightweight lighting fixtures can be expected. As a conventional lighting device using organic EL elements, two organic EL elements are connected in parallel so that their forward directions are opposite to each other, and forward voltage and reverse voltage are alternately applied to these organic EL elements. Patent Document 1 discloses that the life of the organic EL element is increased.

この種の照明装置の従来例として、次のようなものがある。この従来例は、図３（ａ）に示すように、４つの有機ＥＬ素子１０を順方向を同一として直列に接続した第一の直列回路２０ａと、４つの有機ＥＬ素子１０を第一の直列回路２０ａの有機ＥＬ素子１０に対して逆方向を同一として直列に接続した第二の直列回路２０ｂとを並列に接続して成る発光部２０の両端を、限流要素３０を介して交流電源ＰＳに接続している。   The following is a conventional example of this type of lighting device. In this conventional example, as shown in FIG. 3A, a first series circuit 20a in which four organic EL elements 10 are connected in series with the same forward direction and four organic EL elements 10 are connected in a first series. An AC power supply PS is connected to both ends of the light emitting unit 20 formed by connecting in parallel a second series circuit 20b connected in series with the same reverse direction to the organic EL element 10 of the circuit 20a via the current limiting element 30. Connected to.

交流電圧が一方の極性の時には、第一の直列回路２０ａに順方向の電圧が印加されて第二の直列回路２０ｂには逆方向の電圧が印加される。交流電圧の極性が反転すると、第一の直列回路２０ａに逆方向の電圧が印加されて第二の直列回路２０ｂには順方向の電圧が印加される。したがって、第一の直列回路２０ａの有機ＥＬ素子１０一個当たりの印加電圧Ｖ１と、第二の直列回路２０ｂの有機ＥＬ素子１０一個当たりの印加電圧Ｖ２の波形と、限流要素３０を流れる電流Ｉ０の波形は図３（ｂ）のようになる。尚、限流要素３０のインピーダンスを変更することで限流要素３０での電圧降下を調節して有機ＥＬ素子１０の印加電圧を変更し、適度の照度が得られるようにしている。   When the AC voltage has one polarity, a forward voltage is applied to the first series circuit 20a, and a reverse voltage is applied to the second series circuit 20b. When the polarity of the AC voltage is reversed, a reverse voltage is applied to the first series circuit 20a and a forward voltage is applied to the second series circuit 20b. Therefore, the waveform of the applied voltage V1 per organic EL element 10 of the first series circuit 20a, the applied voltage V2 per organic EL element 10 of the second series circuit 20b, and the current I0 flowing through the current limiting element 30. The waveform is as shown in FIG. It should be noted that by changing the impedance of the current limiting element 30, the voltage drop at the current limiting element 30 is adjusted to change the voltage applied to the organic EL element 10 so that an appropriate illuminance can be obtained.

このように構成することで、交流電源ＰＳの出力を整流及び平滑、並びに降圧することなく容易に有機ＥＬ素子１０の駆動に適した電圧を供給することができる。また有機ＥＬ素子１０に対して順方向の電圧及び逆方向の電圧を交互に印加するので、有機ＥＬ素子１０の寿命を長くすることができる。
特開２００１−２０３０７７号公報 With this configuration, it is possible to easily supply a voltage suitable for driving the organic EL element 10 without rectifying, smoothing, and stepping down the output of the AC power supply PS. Moreover, since the forward voltage and the reverse voltage are alternately applied to the organic EL element 10, the lifetime of the organic EL element 10 can be extended.
JP 2001-203077 A

ところで、図４（ａ）に示すように、上記従来例の第一の直列回路２０ａの有機ＥＬ素子が一個故障して回路が開放された場合を考えると、交流電圧が第二の直列回路２０ｂの有機ＥＬ素子１０に対して順方向の極性の場合は正常な場合と同様であるが、逆極性の場合は、第一の直列回路２０ａが開放されているために限流要素３０に電流Ｉ０が流れず、したがって第一の直列回路２０ａの両端に交流電源ＰＳの電圧がそのまま印加される。すると第一の直列回路２０ａと並列に接続されている第二の直列回路２０ｂの両端にも交流電源ＰＳの電圧がそのまま印加されるため、正常な場合と比べて高い逆方向の電圧が第二の直列回路２０ｂに印加されるので、有機ＥＬ素子１０の劣化及び破壊を招く恐れがあった（図４（ｂ）参照）。   By the way, as shown in FIG. 4A, considering the case where one organic EL element of the first series circuit 20a of the conventional example fails and the circuit is opened, the AC voltage is the second series circuit 20b. When the polarity is forward with respect to the organic EL element 10, the polarity is the same as in the normal case. However, when the polarity is reverse, the current I 0 is supplied to the current limiting element 30 because the first series circuit 20 a is open. Therefore, the voltage of the AC power supply PS is applied to both ends of the first series circuit 20a as it is. Then, since the voltage of the AC power supply PS is applied as it is to both ends of the second series circuit 20b connected in parallel with the first series circuit 20a, the voltage in the reverse direction is higher than that in the normal case. Therefore, the organic EL element 10 may be deteriorated and destroyed (see FIG. 4B).

本発明は上記の点に鑑みて為されたもので、有機ＥＬ素子の一部が故障した場合に残りの素子の劣化及び破壊を防ぐことのできる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 above points, and an object of the present invention is to provide an illumination device that can prevent deterioration and destruction of the remaining elements when a part of the organic EL element fails.

請求項１の発明は、上記目的を達成するために、交流電源の両端に限流要素を介して第一の発光部及び第二の発光部が並列に接続され、第一の発光部は、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成り、第二の発光部は、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成り、第一の発光部と第二の発光部は互いに順方向が逆向きとなるように接続されることを特徴とする。   In order to achieve the above object, the first light-emitting part and the second light-emitting part are connected in parallel to both ends of the AC power source via a current limiting element. A series circuit in which one or more organic EL elements are connected in series with the same forward direction, a resistor connected in parallel to the series circuit, and a rectifier connected in series to the series circuit with the same forward direction The second light emitting unit includes one or more organic EL elements connected in series with the same forward direction, a resistor connected in parallel to the series circuit, and the series circuit. The rectifying elements are connected in series with the same forward direction, and the first light emitting part and the second light emitting part are connected so that the forward directions are opposite to each other.

本発明によれば、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成る第一の発光部と、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成る第二の発光部とを互いに順方向が逆向きとなるように並列に接続したので、正常な状態において第一の発光部及び第二の発光部に対する逆方向の印加電圧を低くすることができ、また第一の発光部又は第二の発光部の何れか一方が故障等して回路が開放された状態においても、他方の発光部に対する逆方向の印加電圧を低く抑えることができ、したがって有機ＥＬ素子の劣化及び破壊を防ぐことができる。   According to the present invention, a series circuit in which one or more organic EL elements are connected in series with the same forward direction, a resistor connected in parallel to the series circuit, and a forward direction in the series circuit are made the same. A first light-emitting unit composed of a rectifying element connected in series, a series circuit in which one or more organic EL elements are connected in series with the same forward direction, and a resistor connected in parallel to the series circuit; In the normal state, the second light-emitting section composed of the rectifying elements connected in series with the same forward direction to the series circuit is connected in parallel so that the forward directions are opposite to each other. The applied voltage in the reverse direction to the light emitting unit and the second light emitting unit can be lowered, and either the first light emitting unit or the second light emitting unit is broken and the circuit is opened. Also, keep the applied voltage in the opposite direction to the other light emitting part low. It can, therefore it is possible to prevent the deterioration and destruction of the organic EL element.

以下、本発明の実施形態について図１、２を用いて説明する。本実施形態の照明装置は、図１（ａ）に示すように、交流電源ＰＳの両端に限流要素３を介して第一の発光部１及び第二の発光部２を並列に接続して構成されている。第一の発光部１は、４つの有機ＥＬ素子５を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗４と、該直列回路に順方向を同一にして直列に接続される整流素子６とから成り、第二の発光部２は、４つの有機ＥＬ素子５を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗４と、該直列回路に順方向を同一にして直列に接続される整流素子６とから成り、第一の発光部１と第二の発光部２は互いに順方向が逆向きとなるように接続されている。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. As shown in FIG. 1A, the illumination device of the present embodiment has a first light emitting unit 1 and a second light emitting unit 2 connected in parallel via current limiting elements 3 at both ends of an AC power supply PS. It is configured. The first light emitting unit 1 includes a series circuit in which four organic EL elements 5 are connected in series with the same forward direction, a resistor 4 connected in parallel to the series circuit, and the same forward direction as the series circuit. The second light emitting unit 2 is connected in series with four organic EL elements 5 connected in series with the same forward direction, and connected in parallel to the series circuit. And the rectifying element 6 connected in series with the same forward direction to the series circuit. The first light emitting unit 1 and the second light emitting unit 2 have their forward directions opposite to each other. So connected.

交流電源ＰＳは、如何なるものでもよいが、例えば実効電圧が１００Ｖ、電源周波数が５０Ｈｚ又は６０Ｈｚの商用電源を用いることができる。   The AC power source PS may be any type, and for example, a commercial power source having an effective voltage of 100 V and a power frequency of 50 Hz or 60 Hz can be used.

有機ＥＬ素子５は、規定の方向に電圧を印加することで発光するもので、ここでは交流電源ＰＳの交流電圧を受けて駆動する。尚、本実施形態では、第一の発光部１及び第二の発光部２の直列回路はそれぞれ４つの有機ＥＬ素子５で構成されているが、これに限定される必要は無く、必要とする発光量に応じて素子数を変更してもよい。   The organic EL element 5 emits light by applying a voltage in a specified direction, and is driven by receiving an AC voltage of an AC power source PS here. In the present embodiment, each of the series circuits of the first light emitting unit 1 and the second light emitting unit 2 is configured by four organic EL elements 5, but it is not necessary to be limited to this and is necessary. The number of elements may be changed according to the amount of light emission.

限流要素３は抵抗から成り、抵抗値を変更することで該限流要素３での電圧降下を調節し、第一の発光部１及び第二の発光部２の両端に印加される電圧を調節することで、有機ＥＬ素子５の駆動に適した電圧（駆動電圧）を印加する。整流素子６は整流ダイオードから成り、交流電源ＰＳのピーク電圧に対する耐圧を確保するのが望ましい。   The current limiting element 3 is composed of a resistor, and the voltage drop at the current limiting element 3 is adjusted by changing the resistance value, and the voltage applied to both ends of the first light emitting unit 1 and the second light emitting unit 2 is adjusted. By adjusting, a voltage (drive voltage) suitable for driving the organic EL element 5 is applied. The rectifying element 6 is composed of a rectifying diode, and it is desirable to ensure a withstand voltage against the peak voltage of the AC power supply PS.

以下、本実施形態の動作説明をする。交流電源ＰＳが第二の発光部２の有機ＥＬ素子５の順方向の極性の場合、限流要素３及び第二の発光部２の直列回路を介して電流が流れ、第二の発光部２の各有機ＥＬ素子５には駆動電圧が印加される。交流電源ＰＳの極性が反転すると、限流要素３及び第一の発光部１の直列回路に電流が流れる。第二の発光部２の整流素子６は、並列に等価的に容量成分をもつので、第二の発光部２の抵抗４を介して並列容量が充電され、第二の発光部２の整流素子６に逆電圧が発生する。したがって、第二の発光部２の直列回路には順方向の電圧値よりも低い逆電圧が印加され、各有機ＥＬ素子５には駆動電圧よりも低い逆電圧が印加される。第二の発光部２の有機ＥＬ素子５の印加電圧Ｖ２の波形と、第二の発光部２の整流素子６の印加電圧ＶＤ２の波形と、限流要素３を流れる電流Ｉ０の波形は図１（ｂ）のようになる。尚、第一の発光部１の有機ＥＬ素子５の印加電圧波形は、第二の発光部２の有機ＥＬ素子５の印加電圧波形を反転させたものとなる。   The operation of this embodiment will be described below. When the AC power supply PS has the forward polarity of the organic EL element 5 of the second light emitting unit 2, a current flows through the series circuit of the current limiting element 3 and the second light emitting unit 2, and the second light emitting unit 2. A driving voltage is applied to each organic EL element 5. When the polarity of the AC power supply PS is reversed, a current flows through the series circuit of the current limiting element 3 and the first light emitting unit 1. Since the rectifying element 6 of the second light emitting unit 2 has a capacitive component equivalently in parallel, the parallel capacitor is charged via the resistor 4 of the second light emitting unit 2, and the rectifying element of the second light emitting unit 2 is charged. 6 generates a reverse voltage. Therefore, a reverse voltage lower than the forward voltage value is applied to the series circuit of the second light emitting unit 2, and a reverse voltage lower than the drive voltage is applied to each organic EL element 5. The waveform of the applied voltage V2 of the organic EL element 5 of the second light emitting unit 2, the waveform of the applied voltage VD2 of the rectifying element 6 of the second light emitting unit 2, and the waveform of the current I0 flowing through the current limiting element 3 are shown in FIG. As shown in (b). The applied voltage waveform of the organic EL element 5 of the first light emitting unit 1 is obtained by inverting the applied voltage waveform of the organic EL element 5 of the second light emitting unit 2.

ここで、図２（ａ）に示すように、第一の発光部１の有機ＥＬ素子５の一つが故障し、第一の発光部１の直列回路が開放されたとする。交流電源ＰＳが第二の発光部２の有機ＥＬ素子５の順方向の極性の場合は、正常な場合と同様に第二の発光部２の有機ＥＬ素子５には駆動電圧が印加される。交流電源ＰＳの極性が反転すると、第一の発光部１の直列回路が開放されているために限流要素３には電流が流れず、第二の発光部２の両端には交流電源ＰＳの電圧がそのまま印加される。ここで、第二の発光部２の整流素子６の並列容量が第二の発光部２の抵抗４を介して充電され、該整流素子６に逆電圧が発生する。したがって、第二の発光部２の直列回路には、交流電源ＰＳの電圧がそのまま印加される場合よりも低い電圧が印加され、各有機ＥＬ素子５には駆動電圧よりも低い逆電圧が印加される。第二の発光部２の有機ＥＬ素子５の印加電圧Ｖ２の波形と、第二の発光部２の整流素子６の印加電圧ＶＤ２の波形と、限流要素３を流れる電流Ｉ０の波形は図２（ｂ）のようになる。   Here, as shown in FIG. 2A, it is assumed that one of the organic EL elements 5 of the first light emitting unit 1 has failed and the series circuit of the first light emitting unit 1 is opened. When the AC power supply PS has the forward polarity of the organic EL element 5 of the second light emitting unit 2, a driving voltage is applied to the organic EL element 5 of the second light emitting unit 2 as in the normal case. When the polarity of the AC power source PS is reversed, the current circuit does not flow through the current limiting element 3 because the series circuit of the first light emitting unit 1 is open, and the AC power source PS is connected to both ends of the second light emitting unit 2. The voltage is applied as it is. Here, the parallel capacitance of the rectifying element 6 of the second light emitting unit 2 is charged via the resistor 4 of the second light emitting unit 2, and a reverse voltage is generated in the rectifying element 6. Therefore, a voltage lower than the case where the voltage of the AC power supply PS is applied as it is is applied to the series circuit of the second light emitting unit 2, and a reverse voltage lower than the drive voltage is applied to each organic EL element 5. The The waveform of the applied voltage V2 of the organic EL element 5 of the second light emitting unit 2, the waveform of the applied voltage VD2 of the rectifying element 6 of the second light emitting unit 2, and the waveform of the current I0 flowing through the current limiting element 3 are shown in FIG. As shown in (b).

上述のように、第一の発光部１及び第二の発光部２の有機ＥＬ素子５の直列回路に、それぞれ抵抗４を並列に接続し且つ整流素子６を直列に接続したので、正常時には各有機ＥＬ素子５に対する逆方向の印加電圧を低く抑えることができ、また一方の有機ＥＬ素子５が故障した場合にも他方の有機ＥＬ素子５は発光することができ、さらに各有機ＥＬ素子５に対する逆方向の印加電圧を正常時と同様に低く抑えることができる。したがって、有機ＥＬ素子５に過大な逆電圧が印加されるのを防ぎ、素子の劣化及び破壊を防ぐことができる。   As described above, the resistor 4 is connected in parallel and the rectifier element 6 is connected in series to the series circuit of the organic EL elements 5 of the first light emitting unit 1 and the second light emitting unit 2, respectively. The applied voltage in the reverse direction with respect to the organic EL element 5 can be kept low, and when one organic EL element 5 breaks down, the other organic EL element 5 can emit light, and further to each organic EL element 5 The applied voltage in the reverse direction can be kept low as in the normal case. Therefore, it is possible to prevent an excessive reverse voltage from being applied to the organic EL element 5 and to prevent deterioration and destruction of the element.

本発明の実施形態の照明装置を示す図で、（ａ）は全体の回路図で、（ｂ）は有機ＥＬ素子及び整流素子に印加される電圧と限流要素を流れる電流の波形図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the illuminating device of embodiment of this invention, (a) is a whole circuit diagram, (b) is a wave form diagram of the electric current which flows through the voltage applied to an organic EL element and a rectifier, and a current limiting element. . 本発明の実施形態の照明装置の一部が故障した場合を示す図で、（ａ）は全体の回路図で、（ｂ）は有機ＥＬ素子及び整流素子に印加される電圧と限流要素を流れる電流の波形図である。It is a figure which shows the case where a part of illuminating device of embodiment of this invention fails, (a) is a whole circuit diagram, (b) is the voltage applied to an organic EL element and a rectifier, and a current-limiting element. It is a wave form diagram of the electric current which flows. 従来の照明装置を示す図で、（ａ）は全体の回路図で、（ｂ）は有機ＥＬ素子に印加される電圧と限流要素を流れる電流の波形図である。It is a figure which shows the conventional illuminating device, (a) is a whole circuit diagram, (b) is a wave form diagram of the electric current which flows through the voltage applied to an organic EL element, and a current limiting element. 従来の照明装置の一部が故障した場合を示す図で、（ａ）は全体の回路図で、（ｂ）は有機ＥＬ素子に印加される電圧と限流要素を流れる電流の波形図である。It is a figure which shows the case where a part of conventional illuminating device fails, (a) is a whole circuit diagram, (b) is a waveform diagram of the voltage applied to an organic EL element, and the electric current which flows through a current limiting element. .

符号の説明Explanation of symbols

１ 第一の発光部
２ 第二の発光部
３ 限流要素
４ 抵抗
５ 有機ＥＬ素子
６ 整流素子 DESCRIPTION OF SYMBOLS 1 1st light emission part 2 2nd light emission part 3 Current limiting element 4 Resistance 5 Organic EL element 6 Rectifier

Claims (1)

交流電源の両端に限流要素を介して第一の発光部及び第二の発光部が並列に接続され、第一の発光部は、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成り、第二の発光部は、一乃至複数の有機ＥＬ素子を順方向を同一にして直列に接続した直列回路と、該直列回路に並列に接続される抵抗と、該直列回路に順方向を同一にして直列に接続される整流素子とから成り、第一の発光部と第二の発光部は互いに順方向が逆向きとなるように接続されることを特徴とする照明装置。
The first light emitting unit and the second light emitting unit are connected in parallel to both ends of the AC power source via a current limiting element, and the first light emitting unit has one or more organic EL elements in series with the same forward direction A series circuit connected to the series circuit, a resistor connected in parallel to the series circuit, and a rectifying element connected in series with the same forward direction to the series circuit. A series circuit in which the organic EL elements are connected in series with the same forward direction, a resistor connected in parallel to the series circuit, and a rectifier element connected in series with the same forward direction to the series circuit The lighting device is characterized in that the first light emitting unit and the second light emitting unit are connected so that their forward directions are opposite to each other.
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