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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JP4665715B2 (en
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Minoru Maehara
Tomoyuki Nakano
智之 中野
稔 前原
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Matsushita Electric Works Ltd
松下電工株式会社
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Abstract

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.
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.
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 a lighting 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。 Recently, research of the organic EL element as a thin solid-state light-emitting element is active. 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。 The organic EL element is a structure which sandwiches the light emitting layer of a thin film made of an organic compound in the electrode, an element that emits light when supplying a voltage between the electrodes. 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。 The organic EL element may constitute the light emitting element of thin and lightweight, and because the driving voltage is the driving voltage is lower than several V tens several V and a conventional mainstream light source is a discharge lamp, it can be constructed at low cost the lighting apparatus , thin and its application to lightweight lighting fixtures can be expected. 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。 A lighting apparatus using a conventional organic EL device, the order of the two organic EL elements each other direction is connected in parallel to the opposite direction, applying a forward voltage and reverse voltage are alternately thereto organic EL device which prolong the life of the organic EL device is disclosed in Patent Document 1.

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。 As a conventional example of this type of lighting device, it is as follows. 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。 This conventional example, as shown in FIG. 3 (a), four and a first series circuit 20a connected in series to the organic EL element 10 as the same forward, four organic EL device 10 first series both ends of the light emitting portion 20 formed by connecting the second series circuit 20b connected in series in the opposite direction as the same for the organic EL element 10 of the circuit 20a in parallel, the AC power supply PS through the current limiting element 30 It is 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。 When an AC voltage is of one polarity, reverse voltage is applied to the second series circuit 20b with a forward voltage is applied to the first series circuit 20a. 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。 When the polarity of the AC voltage is inverted, forward voltage is applied to the second series circuit 20b with a reverse voltage is applied to the first series circuit 20a. 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。 Accordingly, the applied voltage V1 of the organic EL element 10 one per first series circuit 20a, a waveform of the applied voltage V2 of the organic EL element 10 one per second serial circuit 20b, a current flows through the current limiting element 30 I0 the waveform is shown in FIG. 3 (b). 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。 Incidentally, by changing the voltage applied to the organic EL element 10 by adjusting the voltage drop at the current limiting element 30 by changing the impedance of the current limiting element 30, so that appropriate illumination 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。 With this configuration, it is possible to supply rectifying and smoothing the output of the AC power source PS, and a voltage suitable for driving the easy organic EL element 10 without stepping down. 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。 Since alternately applies a forward voltage and reverse voltage to the organic EL element 10, it is possible to increase the life of the organic EL element 10.
特開2001−203077号公報 JP 2001-203077 JP

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。 Meanwhile, as shown in FIG. 4 (a), the the first organic EL element is one failing circuit of a series circuit 20a of the conventional example consider the case which is opened, the AC voltage is a second series circuit 20b of While in the case of the polarity of the forward direction with respect to the organic EL element 10 is the same as the normal case, in the case of reverse polarity, current current limiting element 30 to the first series circuit 20a is opened I0 no flow, thus the voltage of the AC power source PS is applied directly to the two ends of the first series circuit 20a. 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)。 Then the voltage across even the AC power supply PS of the second series circuit 20b are connected in parallel with the first series circuit 20a is applied as it is, a high reverse voltage in comparison with the normal case the second since the applied to the series circuit 20b, there may cause deterioration and destruction of the organic EL element 10 (see Figure 4 (b)).

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, and an object thereof is to provide an illumination device which can prevent the deterioration and destruction of the remaining elements in the case where a part of the organic EL device has failed.

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。 The invention according to claim 1, in order to achieve the above object, the first light emitting portion and the second light-emitting portion is connected in parallel via a current limiting element to both ends of the AC power source, the first light emitting part, a series circuit connected one or a plurality of organic EL elements in series with the forward to the same, a resistor connected in parallel to the series circuit, a rectifier connected in series with the forward to the same in the series circuit consists of a device, the second light emitting part, one or a plurality of organic EL elements and a series circuit connected in series with the forward to the same, a resistor connected in parallel to the series circuit, in the series circuit It consists of a rectifier element connected in series with the forward to the same, the first light emitting portion and the second light-emitting portion and being connected to each other so that the forward direction are opposite.

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 According to the present invention, and one or a plurality of organic EL elements and a series circuit connected in series with the forward to the same, a resistor connected in parallel to the series circuit, in the same forward to the series circuit a first light-emitting portion consisting of a rectifier element connected in series, a series circuit connected one or a plurality of organic EL elements in series with the forward to the same resistance and connected in parallel to the series circuit since connected in parallel such that the second light-emitting portion and the mutually forward direction opposite consisting of a rectifier element connected in series with the forward to the same in the series circuit, the first in normal conditions the light emitting portion and the opposite direction of the applied voltage can be lowered with respect to the second light emitting portion and in a state where either one circuit to failure or the like is opened in the first light emitting portion or the second light emitting portion also, suppressing the reverse voltage applied to the other light emitting portion 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。 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。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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。 Lighting apparatus of the present embodiment, as shown in FIG. 1 (a), the first light-emitting portion 1 and the second light-emitting portion 2 are connected in parallel via a current limiting element 3 at both ends of the AC power supply PS It is configured. 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。 The first light-emitting portion 1, the same four organic EL element 5 and the series circuit connected in series with the forward to the same, a resistor 4 connected in parallel to the series circuit, the forward direction the series circuit to to consist rectifying element 6 that are connected in series, the second light-emitting unit 2, connecting four organic EL element 5 and the series circuit connected in series with the forward to the same, in parallel with the series circuit a resistor 4 which is made from the rectifier element 6 that is connected in series with the forward to the same in the series circuit, the forward direction is the opposite first light emitting unit 1 and the second light-emitting portion 2 to each other It is connected so.

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。 AC power source PS may be any and, for example effective voltage 100 V, the power supply frequency can be used commercial power supply 50Hz or 60 Hz.

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。 The organic EL element 5 is for emitting by applying a voltage to a defined direction, here driven by receiving the AC voltage of the AC power supply PS. 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。 In the present embodiment, the first light emitting portion 1 and a second series circuit of the light emitting portion 2 is composed of four organic EL element 5, respectively, but necessarily limited thereto without requiring it may change the number of elements in accordance with 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。 Current limiting element 3 consists of resistors, a voltage drop at 該限 flow element 3 by changing the resistance value by adjusting the voltage applied to the first ends of the light emitting portion 1 and the second light emitting section 2 by adjusting, for applying a voltage (driving voltage) suitable for driving the organic EL element 5. 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。 Rectifying element 6 consists rectifier diode, it is desirable to ensure the withstand voltage with respect to the peak voltage of the AC power supply PS.

以下、本実施形態の動作説明をする。 Hereinafter, the description of the operation of the present embodiment. 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。 If the AC power source PS is polarity of the second forward direction of the organic EL element 5 of the light emitting portion 2, a current flows through a series circuit of a current limiting element 3 and the second light-emitting portion 2, the second light-emitting portion 2 each organic EL element 5 of the drive voltage is applied. 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。 When the polarity of the AC power supply PS is reversed, the current flows through the current limiting element 3 and the first of the series circuit of the light emitting portion 1. 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。 Rectifying element 6 second light emitting portion 2, because it has an equivalent capacitive component in parallel, parallel capacitance through a resistor 4 of the second light-emitting portion 2 is charged, the second light-emitting portion 2 rectifying element reverse voltage is generated in the 6. 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。 Accordingly, the second series circuit of the light emitting portion 2 is applied is lower reverse voltage than the voltage value of the forward, each organic EL element 5 lower reverse voltage than the driving voltage is applied. 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。 A second waveform of the applied voltage V2 of the organic EL element 5 of the light emitting portion 2, and the waveform of the applied voltage VD2 of the second light-emitting portion 2 rectifying element 6, the waveform of the current I0 flowing through the current limiting element 3 1 It becomes as shown in (b). 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。 Note that the first applied voltage waveform of the organic EL element 5 of the light-emitting portion 1, and that a second applied voltage waveform of the organic EL element 5 of the light emitting portion 2 is reversed.

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。 Here, as shown in FIG. 2 (a), one of the first light emitting portion 1 of the organic EL element 5 has failed, the first series circuit of the light emitting portion 1 is opened. 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。 AC power supply PS is the case of the polarity of the second forward direction of the organic EL element 5 of the light emitting portion 2, as with the normal to the second organic EL element 5 of the light-emitting portion 2 drive voltage is applied. 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。 When the polarity of the AC power supply PS is inverted, the first light emitting portion 1 no current flows in the current limiting element 3 to the series circuit is open, the second ends of the light emitting portion 2 of the AC power supply PS a voltage is applied as it is. 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。 Here, the parallel capacitance of the second rectifying element 6 of the light emitting portion 2 is charged through the second resistor 4 of the light emitting portion 2, a reverse voltage is generated in the rectifying element 6. 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。 Accordingly, the second series circuit of the light emitting portion 2, is a voltage lower than that applied when the voltage of the AC power source PS is applied as it is, low reverse voltage than the driving voltage is applied to each organic EL element 5 that. 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。 A second applied voltage V2 of the organic EL element 5 of the light-emitting portion 2 waveform, and the waveform of the applied voltage VD2 of the second light-emitting portion 2 rectifying element 6, the waveform of the current I0 flowing through the current limiting element 3 2 It becomes 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。 As described above, the first light emitting portion 1 and a second series circuit of the organic EL element 5 of the light emitting portion 2, since the connecting and rectifying elements 6 are respectively connected to resistors 4 in parallel to the series, during normal individual the reverse voltage applied to the organic EL element 5 can be kept low, also the other organic EL element 5 even when one of the organic EL element 5 has failed can emit, for each organic EL element 5 further opposite direction of the applied voltage can be suppressed successfully when similarly to low. 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。 Accordingly, it prevents excessive reverse voltage is applied to the organic EL element 5, it is possible to prevent the deterioration and destruction of the device.

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。 In view showing a lighting device of an embodiment of the present invention, is a waveform diagram of the current flowing through (a) is a circuit diagram of the whole, (b) the voltage and current limiting element which is applied to the organic EL element and a rectifier 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。 In diagram showing a case where part of the illumination device of the exemplary embodiment of the present invention fails, (a) represents the circuit diagram of the whole, the (b) the voltage and the current limit element applied to the organic EL element and a rectifier element it is a waveform diagram of the current flowing. 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。 A diagram showing a conventional illumination apparatus, (a) represents the circuit diagram of the whole, (b) is a waveform diagram of the current flowing through the voltage and the current limit element applied to the organic EL 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。 A view showing a case where a part of the conventional lighting device fails, is a waveform diagram of the current flowing through (a) is a circuit diagram of the whole, (b) the voltage and current limiting element which is applied to the organic EL device .

符号の説明 DESCRIPTION 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 1 The first light emitting unit 2 the second light emitting portion 3 current-limiting element 4 resistor 5 organic EL device 6 rectifying element

Claims (1)

  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 portion and the second light-emitting portion via a current limiting element to both ends of the AC power source is connected in parallel, the first light emitting portion is to one or more of the organic EL element forward the same series a series circuit connected to, composed of a resistor connected in parallel to the series circuit, a rectifying element connected in series with the forward to the same in the series circuit, the second light emitting unit may include one or more from the organic EL element in series circuit connected in series with the forward to the same, a resistor connected in parallel to the series circuit, a rectifying element connected in series with the forward to the same in the series circuit made, the illumination device and the first light emitting portion and the second light-emitting portion, characterized in that it is connected to a forward one another in the opposite direction.
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WO2010091619A1 (en) * 2009-02-10 2010-08-19 Wong Wah Nam Method for automatically identifying current in led for illumination
CN105792408A (en) * 2015-01-09 2016-07-20 松下知识产权经营株式会社 Illumination system and luminaire

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CN105792408A (en) * 2015-01-09 2016-07-20 松下知识产权经营株式会社 Illumination system and luminaire

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