JP2004311193A - El element and illumination device using it - Google Patents

El element and illumination device using it Download PDF

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Publication number
JP2004311193A
JP2004311193A JP2003102615A JP2003102615A JP2004311193A JP 2004311193 A JP2004311193 A JP 2004311193A JP 2003102615 A JP2003102615 A JP 2003102615A JP 2003102615 A JP2003102615 A JP 2003102615A JP 2004311193 A JP2004311193 A JP 2004311193A
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Japan
Prior art keywords
light
electrode
layer
electrode layer
transmitting
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JP2003102615A
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Japanese (ja)
Inventor
Kenji Otomo
賢治 大友
Masahiko Asano
雅彦 浅野
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2003102615A priority Critical patent/JP2004311193A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an EL element used for a backlight of a display part, an operation part or the like of various kinds of electronic apparatuses; and to provide an illumination device using it and capable of various kinds of illumination. <P>SOLUTION: This EL element 20 is composed by forming electrode patterns 13C, 13D, 13E and 13F in a periphery of a light transmitting electrode layer 12, and by forming resistance layers 14A, 14B, 14C and 14D between the respective electrode patterns. Thereby, voltage drop is generated depending on the respective resistance layers to set voltages applied to the electrode patterns different from one another, so that this illumination device capable of making luminance of an illuminant layer 15 at a predetermined position different, and of various kinds of illumination having a variety of brightness can be provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、車載用電子機器や携帯端末機器など、各種電子機器の表示部や操作部等のバックライトに用いられるEL素子及びこれを用いた照光装置に関するものである。
【0002】
【従来の技術】
近年、車載用電子機器や携帯端末機器などの各種電子機器の高機能化、多様化が進むにつれて、これらの表示部や操作部の後方に照光用のバックライトとして用いられるEL素子にも多様な照光機能が求められている。
【0003】
このような従来のEL素子について、図6及び図7を用いて説明する。
【0004】
図6は従来のEL素子の断面図、図7は同平面図であり、1は光透過性でフィルム等の基材で、この上面には、スパッタ法または電子ビーム法等によって、酸化インジウム錫等の光透過性電極層2が形成されている。
【0005】
そして、光透過性電極層2上には、合成樹脂に発光の母材となる硫化亜鉛などの蛍光体を分散した発光体層4、同じく合成樹脂にチタン酸バリウムなどを分散した誘電体層5、同じく合成樹脂に銀やカーボンなどを分散した背面電極層6が、順次重ねて印刷形成され、これらを絶縁層7が覆っている。
【0006】
また、基材1のテール部1Aには、合成樹脂に銀を分散した略矩形の電極部3Aが印刷形成され、これに並んで配置された電極部3Bから延出して形成した電極パターン3Cが光透過性電極層2の周縁に接続されると共に、背面電極層6から延出した端部6Aが電極部3Aに接続されてEL素子10が構成されている。
【0007】
以上のように構成されたEL素子10が、液晶ディスプレイ(以下、LCDと呼ぶ)や操作用押釦等の背面に配置されて電子機器に装着され、テール部1Aの電極部3A及び3Bがコネクター等(図示せず)によって機器の電子回路(図示せず)に接続されて照光装置が構成されている。
【0008】
そして、機器の電子回路内の駆動回路から電極部3A及び3Bに交流電圧を印加すると、電極パターン3Cを介して光透過性電極層2全面に、端部6Aを介して背面電極層6全面に交流電圧が印加されて、発光体層4の全面が発光し、この光が電子機器の表示部や操作部等を後方から照光するため、周囲が暗い場合でも表示部や操作部の識別を行うことができるものであった。
【0009】
なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献1が知られている。
【0010】
【特許文献1】
特開2000−133452号公報
【0011】
【発明が解決しようとする課題】
しかしながら、上記従来のEL素子10においては、EL素子10全面がほぼ一定の輝度で発光するため、表示部や操作部の所定箇所の明るさが異なる照光を行なう場合や、明るさに変化のある照光を行なう場合には、輝度の異なる複数のEL素子を設けたり、複数のEL素子に各々異なる交流電圧の駆動回路を接続することが必要となり、使用部品数が多く構成が複雑なものになるという課題があった。
【0012】
本発明は、このような従来の課題を解決するものであり、使用部品数が少なく簡易な構成で、多様な照光が可能なEL素子及びこれを用いた照明装置を提供することを目的とする。
【0013】
【課題を解決するための手段】
上記目的を達成するために本発明は、以下の構成を有するものである。
【0014】
本発明の請求項1に記載の発明は、光透過性電極層または背面電極層の周縁の少なくとも一辺に複数の電極パターンを形成すると共に、これらの電極パターン間に抵抗層を形成したEL素子を構成したものであり、電極部から印加された電圧が電極パターン間の抵抗層により電圧降下を生じ、発光体層が複数の輝度で発光し明るさに変化のある照光を行なうことができるため、使用部品数が少なく簡易な構成で、多様な照光のEL素子を得ることができるという作用を有する。
【0015】
請求項2に記載の発明は、光透過性電極層または背面電極層の少なくとも一方を複数個形成すると共に、これらの電極層間に抵抗層を形成してEL素子を構成したものであり、抵抗層を介して接続された電極層に加わる電圧が異なるために、発光体層が複数の輝度で発光し、多様な照光が可能になることに加え、電極層周縁の電極パターンも不要となるという作用を有する。
【0016】
請求項3に記載の発明は、請求項1または2に記載のEL素子によって、表示素子や表示パネルまたは操作用押釦を照光するようにして照光装置を構成したものであり、多様な照光が可能な照光装置を実現することができるという作用を有する。
【0017】
【発明の実施の形態】
以下、本発明の実施の形態について、図1〜図5を用いて説明する。
【0018】
(実施の形態1)
実施の形態1を用いて本発明の特に請求項1及び3記載の発明について説明する。
【0019】
図1は本発明の第1の実施の形態によるEL素子の断面図、図2は同平面図であり、11は光透過性で、ガラスやポリエチレンテレフタレートフィルムまたはポリイミドフィルム等の基材で、この上面には、スパッタ法または電子ビーム法、或いは、酸化インジウム錫等を分散した光透過性合成樹脂や、導電性樹脂であるポリエチレンジオキシチオフェン等を印刷して、光透過性電極層12が形成されている。
【0020】
そして、光透過性電極層12上には、フッ素ゴムやシアノ系等の合成樹脂内に発光の母材となる硫化亜鉛などの蛍光体を分散した発光体層15、同じく高誘電性の樹脂内にチタン酸バリウム等を分散した誘電体層16、エポキシ樹脂やポリエステル樹脂などに銀やカーボンなどを分散した背面電極層17が、順次重ねて印刷形成され、これらをエポキシ樹脂やポリエステル樹脂等の絶縁層18が覆うように印刷形成されている。
【0021】
また、基材11のテール部11Aには、合成樹脂に銀を分散した略矩形の電極部13A、及びこれに並んで配置された電極部13Bが印刷形成され、この電極部13Bから延出して形成された電極パターン13Cが、光透過性電極層12の右方の上下周縁に接続されると共に、背面電極層17から延出して形成された端部17Aが電極部13Aに接続されている。
【0022】
そして、光透過性電極層12の中間部や左方の上下周縁には、光透過性電極層12の上辺及び下辺の周縁に沿って、略帯状の電極パターン13D,13E及び13Fが各々所定の間隔を空けて印刷形成されて光透過性電極層12に接続されると共に、これら各電極パターン間には、合成樹脂にカーボン等を分散した抵抗層14A,14B及び14Cが印刷形成され、これらの抵抗層14A〜14Cによって各電極パターン13C〜13F間が接続されて、EL素子20が構成されている。
【0023】
また、このようなEL素子20が基材11側を前面として、例えば図3の平面外観図に示すように、イラストが描かれた透光性樹脂製の表示パネル22の背面に配置されて電子機器に装着され、テール部11Aの電極部13A及び13Bがコネクター等(図示せず)によって機器の電子回路(図示せず)に接続されて、照光装置が構成されている。
【0024】
以上の構成において、機器の電子回路内の駆動回路からEL素子20の電極部13A及び13Bに交流電圧を印加すると、電極パターン13C〜13Fを介して光透過性電極層12に、端部17Aを介して背面電極層17に交流電圧が印加されて、発光体層15が発光し、この光が表示パネル22を後方から照光するが、電極パターン13Cに加わった電圧は、抵抗層14A〜14Cによって各々電圧降下が生じ、電極パターン13D,13E,13Fの順に減少した電圧が印加される。
【0025】
つまり、上下周縁に電極パターン13Cが形成された発光部21Aは最も明るく発光し、以下、電極パターン13Dが形成された発光部21B、発光部21C、発光部21Dの順に輝度が暗く発光する。
【0026】
従って、このEL素子20によって照光される表示パネル22も、下方の照光部22Aが一番明るく照光され、以下、照光部22B,22C,22Dの順に、上方へ向かうほど順次暗くなるように照光されるため、表示パネル22としては遠近感のある表示が行われるように構成されている。
【0027】
このように本実施の形態によれば、光透過性電極層12の周縁の複数の電極パターン13C,13D,13E及び13Fを形成すると共に、各電極パターン間に抵抗層14A,14B,14C及び14Dを形成してEL素子20を構成することによって、使用部品数が少なく簡易な構成で、多様な照光が可能なEL素子及びこれを用いた照光装置を得ることができるものである。
【0028】
なお、以上の説明では、光透過性電極層12の上辺及び下辺の周縁に、各々電極パターン13C,13D,13E及び13Fを形成したが、上辺又は下辺のいずれか一方に複数の電極パターンを形成して、これらの電極パターン間に抵抗層を形成する構成としても、本発明の実施は可能である。
【0029】
(実施の形態2)
実施の形態2を用いて、本発明の特に請求項2及び3記載の発明について説明する。
【0030】
なお、実施の形態1の構成と同一構成の部分には同一符号を付して、詳細な説明は省略する。
【0031】
図4は本発明の第2の実施の形態によるEL素子の断面図、図5は同平面図であり、基材11上面に、スパッタ法または電子ビーム法、或いは、酸化インジウム錫等を分散した光透過性合成樹脂や、導電性樹脂であるポリエチレンジオキシチオフェン等を印刷して、複数の光透過性電極層24A,24Bが所定の間隔を空けて印刷形成されると共に、この光透過性電極層24A,24B間には、樹脂にカーボン等を分散させた抵抗層25A及び25Bが、上下の2箇所に印刷形成されて光透過性電極層24A,24B間を接続している。
【0032】
そして、光透過性電極層24A,24B上には、実施の形態1の場合と同様に、発光体層15や誘電体層16、及び背面電極層17が、順次重ねて印刷形成され、これらを絶縁層18が覆うように印刷形成されている。
【0033】
また、基材11のテール部11Aには、合成樹脂に銀等が分散された略矩形の電極部23Aが印刷形成され、これに並んで形成された略T字状の電極部23Bが光透過性電極層24Aの右側辺に接続されると共に、電極部23Aには背面電極層17から延出した端部17Aが接続されて、EL素子27が構成されている。
【0034】
そして、このような光透過性電極層24Aによって発光する発光部26Aと、光透過性電極層24Bによって発光する発光部26Bを備えたEL素子27が、例えば、発光部26Aは機器のLCD等の表示部(図示せず)の背面に、発光部26Bは操作用押釦等の操作部(図示せず)の背面に配置されて電子機器に装着されると共に、電極部23A,23Bがコネクター等(図示せず)によって機器の電子回路(図示せず)に接続されて、照光装置が構成される。
【0035】
以上の構成において、機器の電子回路内の駆動回路からEL素子27の電極部23A及び23Bに交流電圧を印加すると、発光体層15が発光し、この光が機器の表示部や操作部を後方から照光するが、光透過性電極層24Aに加わる電圧に比べ、光透過性電極層24Bに加わる電圧は抵抗層25Aによって電圧降下を生じ、減少した電圧が印加される。
【0036】
つまり、光透過性電極層24Aが形成された発光部26Aは明るく発光し、光透過性電極層24Bが形成された発光部26Bは暗く発光するため、機器のLCD等の表示部は明るく照光され、押釦等の操作部はやや暗く照光される。
【0037】
このように本発明の形態によれば、複数の光透過性電極層24A,24Bの間に抵抗層25Aを形成することによって、1つのEL素子27で所定の箇所を異なる明るさで照光できる、多様な照光が可能なEL素子及びこれを用いた照光装置を得ることができるものである。
【0038】
なお、以上の説明では、光透過性電極層12の周縁に形成した複数の電極パターン13C〜13F間を抵抗層14A〜14Cで接続したり、光透過性電極層24Aと24Bを抵抗層25Aで接続した構成としたが、背面電極層17の周縁に複数の電極パターンを形成して各電極パターン間を抵抗層で接続したり、背面電極層17を複数に分けて形成し、これらの間を抵抗層で接続してEL素子を構成しても、本発明の実施は可能である。
【0039】
また、電極パターン13C〜13Fの各々の長さや、各電極パターン間の間隔、及び抵抗層14A〜14Dの各幅を適宜設定したり、光透過性電極層24A,24Bの間隔や抵抗層25A,25Bの幅を適宜設定することにより、発光部21A〜21Dや発光部26A,26Bの輝度を所望の明るさとすることができる。
【0040】
さらに、発光部を4箇所、或いは2箇所として説明したが、電極パターンや光透過性電極層及びそれらを接続する抵抗層の数を増やすことによって、輝度の異なる発光部を3箇所あるいは4箇所を越える複数箇所設けて、所望の箇所を異なる明るさで発光させたり、連続的に明るさが変化するものにすることも可能である。
【0041】
【発明の効果】
以上のように本発明によれば、使用部品数が少なく簡易な構成で、多様な照光が可能なEL素子およびこれを用いた照光装置を得ることができるという有利な効果が得られる。
【図面の簡単な説明】
【図1】本発明の第1の実施の形態によるEL素子の断面図
【図2】同平面図
【図3】同照光装置の平面図
【図4】本発明の第2の実施形態によるEL素子の断面図
【図5】同平面図
【図6】従来のEL素子の断面図
【図7】同平面図
【符号の説明】
11 基材
11A テール部
12,24A,24B 光透過性電極層
13A,13B,23A,23B 電極部
13C,13D,13E,13F 電極パターン
14A,14B,14C,25A 抵抗層
15 発光体層
16 誘電体層
17 背面電極層
17A 端部
18 絶縁層
20,27 EL素子
21A,21B,21C,21D,26A,26B 発光部
22A,22B,22C,22D 照光部
22 表示パネル
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an EL element used for a backlight of a display unit or an operation unit of various electronic devices such as an in-vehicle electronic device and a portable terminal device, and an illuminating device using the same.
[0002]
[Prior art]
In recent years, as electronic devices such as in-vehicle electronic devices and portable terminal devices have become more sophisticated and diversified, EL devices used as backlights for illumination behind these display units and operation units have become increasingly diverse. An illumination function is required.
[0003]
Such a conventional EL element will be described with reference to FIGS.
[0004]
FIG. 6 is a cross-sectional view of a conventional EL device, and FIG. 7 is a plan view of the same. Reference numeral 1 denotes a light-transmissive base material such as a film, and indium tin oxide is formed on the upper surface thereof by a sputtering method or an electron beam method. Etc. are formed.
[0005]
On the light-transmitting electrode layer 2, a light-emitting layer 4 in which a phosphor such as zinc sulfide serving as a base material for light emission is dispersed in a synthetic resin, and a dielectric layer 5 in which barium titanate or the like is dispersed in a synthetic resin. Similarly, a back electrode layer 6 in which silver, carbon, or the like is dispersed in a synthetic resin is sequentially superimposed and formed by printing, and an insulating layer 7 covers these.
[0006]
A substantially rectangular electrode portion 3A in which silver is dispersed in a synthetic resin is printed and formed on a tail portion 1A of the base material 1, and an electrode pattern 3C formed by extending from an electrode portion 3B arranged side by side is formed. The EL element 10 is configured by being connected to the periphery of the light transmitting electrode layer 2 and having an end 6A extending from the back electrode layer 6 connected to the electrode section 3A.
[0007]
The EL element 10 configured as described above is disposed on a back surface of a liquid crystal display (hereinafter, referred to as LCD), an operation push button, or the like, and is mounted on an electronic device, and the electrodes 3A and 3B of the tail 1A are connected to a connector or the like. The illumination device is configured by being connected to an electronic circuit (not shown) of the device by (not shown).
[0008]
Then, when an AC voltage is applied to the electrode portions 3A and 3B from the drive circuit in the electronic circuit of the device, the entire surface of the light-transmitting electrode layer 2 via the electrode pattern 3C and the entire surface of the back electrode layer 6 via the end portion 6A. When the AC voltage is applied, the entire surface of the light emitting layer 4 emits light, and this light illuminates the display unit and the operation unit of the electronic device from the rear, so that the display unit and the operation unit can be identified even when the surroundings are dark. Was something that could be done.
[0009]
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
[0010]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-133452
[Problems to be solved by the invention]
However, in the above-described conventional EL element 10, since the entire surface of the EL element 10 emits light with a substantially constant luminance, there is a case where the display section or the operation section is illuminated with different brightness, or the brightness varies. In the case of illuminating, it is necessary to provide a plurality of EL elements having different luminances or to connect driving circuits of different AC voltages to the plurality of EL elements, resulting in a large number of components and a complicated structure. There was a problem.
[0012]
An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an EL element capable of performing various illuminations with a simple configuration using a small number of parts and a lighting device using the EL element. .
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0014]
The invention according to claim 1 of the present invention is directed to an EL element in which a plurality of electrode patterns are formed on at least one side of a periphery of a light transmitting electrode layer or a back electrode layer, and a resistance layer is formed between these electrode patterns. Since the voltage applied from the electrode portion causes a voltage drop due to the resistance layer between the electrode patterns, and the luminous body layer can emit light with a plurality of luminances and perform illumination with a change in brightness, It has an effect that it is possible to obtain EL elements of various illuminations with a simple configuration using a small number of components.
[0015]
According to a second aspect of the present invention, at least one of the light-transmitting electrode layer and the back electrode layer is formed in a plurality, and a resistance layer is formed between these electrode layers to constitute an EL element. Since the voltage applied to the electrode layer connected via the electrode is different, the luminous body layer emits light with a plurality of luminances, enabling various illuminations, and also eliminating the need for an electrode pattern on the periphery of the electrode layer. Having.
[0016]
According to a third aspect of the present invention, an illuminating device is configured by illuminating a display element, a display panel, or an operation push button with the EL element according to the first or second aspect. This has the effect of realizing a simple lighting device.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.
[0018]
(Embodiment 1)
The first embodiment of the present invention will be described in particular with reference to the first embodiment.
[0019]
FIG. 1 is a cross-sectional view of an EL device according to a first embodiment of the present invention, and FIG. 2 is a plan view of the EL device. Reference numeral 11 denotes a light-transmitting substrate made of glass, polyethylene terephthalate film, polyimide film, or the like. On the upper surface, a light-transmitting electrode layer 12 is formed by printing a light-transmitting synthetic resin in which indium tin oxide or the like is dispersed, a conductive resin such as polyethylene dioxythiophene, or the like, by a sputtering method, an electron beam method, or the like. Have been.
[0020]
On the light-transmitting electrode layer 12, a light-emitting layer 15 in which a phosphor such as zinc sulfide serving as a base material for light emission is dispersed in a synthetic resin such as a fluororubber or a cyano-based resin is formed. A dielectric layer 16 in which barium titanate or the like is dispersed, and a back electrode layer 17 in which silver or carbon is dispersed in an epoxy resin or polyester resin are sequentially formed by printing, and these are insulated by an epoxy resin or polyester resin. It is printed and formed so as to cover the layer 18.
[0021]
Further, on the tail portion 11A of the base material 11, a substantially rectangular electrode portion 13A in which silver is dispersed in a synthetic resin, and an electrode portion 13B arranged side by side are formed by printing, and extend from the electrode portion 13B. The formed electrode pattern 13C is connected to the upper and lower peripheral edges on the right side of the light transmissive electrode layer 12, and an end portion 17A extending from the back electrode layer 17 is connected to the electrode portion 13A.
[0022]
In the middle of the light-transmitting electrode layer 12 and the upper and lower peripheral edges on the left, substantially strip-shaped electrode patterns 13D, 13E, and 13F are respectively provided along the upper and lower edges of the light-transmitting electrode layer 12. Printed at intervals and connected to the light transmissive electrode layer 12, and between these electrode patterns, resistance layers 14A, 14B and 14C in which carbon or the like is dispersed in synthetic resin are printed and formed. Each of the electrode patterns 13C to 13F is connected by the resistance layers 14A to 14C to form the EL element 20.
[0023]
In addition, such an EL element 20 is disposed on the back surface of a light-transmitting resin display panel 22 on which an illustration is drawn, for example, as shown in the plan view of FIG. The illuminator is mounted on the device, and the electrodes 13A and 13B of the tail 11A are connected to an electronic circuit (not shown) of the device by a connector or the like (not shown).
[0024]
In the above configuration, when an AC voltage is applied to the electrode portions 13A and 13B of the EL element 20 from the drive circuit in the electronic circuit of the device, the end portion 17A is connected to the light transmitting electrode layer 12 via the electrode patterns 13C to 13F. An AC voltage is applied to the back electrode layer 17 through the light-emitting body layer 15 to emit light, and this light illuminates the display panel 22 from behind. The voltage applied to the electrode pattern 13C is increased by the resistance layers 14A to 14C. A voltage drop occurs, and a reduced voltage is applied to the electrode patterns 13D, 13E, and 13F in this order.
[0025]
That is, the light emitting portion 21A having the electrode pattern 13C formed on the upper and lower peripheral edges emits the brightest light, and thereafter, the light emitting portion 21B having the electrode pattern 13D formed thereon, the light emitting portion 21C, and the light emitting portion 21D emit light with lower luminance in this order.
[0026]
Accordingly, the display panel 22 illuminated by the EL element 20 is also illuminated so that the lower illuminating portion 22A is illuminated brightest, and thereafter, the lower the illuminating portions 22B, 22C, and 22D, the lower the illuminating portion. For this reason, the display panel 22 is configured to provide a perspective display.
[0027]
As described above, according to the present embodiment, a plurality of electrode patterns 13C, 13D, 13E, and 13F on the periphery of the light transmitting electrode layer 12 are formed, and the resistance layers 14A, 14B, 14C, and 14D are provided between the electrode patterns. By forming the EL element 20 by forming the EL element, it is possible to obtain an EL element capable of performing various illuminations with a simple configuration using a small number of components and an illumination device using the same.
[0028]
In the above description, the electrode patterns 13C, 13D, 13E, and 13F are formed on the periphery of the upper side and the lower side of the light transmissive electrode layer 12, respectively. However, a plurality of electrode patterns are formed on one of the upper side and the lower side. Thus, the present invention can be practiced even when a resistance layer is formed between these electrode patterns.
[0029]
(Embodiment 2)
The second embodiment of the present invention will be described with reference to the second embodiment.
[0030]
The same components as those of the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.
[0031]
FIG. 4 is a cross-sectional view of the EL device according to the second embodiment of the present invention, and FIG. 5 is a plan view of the EL device, in which a sputtering method, an electron beam method, or indium tin oxide or the like is dispersed on the upper surface of the substrate 11. A plurality of light-transmitting electrode layers 24A and 24B are printed at predetermined intervals by printing a light-transmitting synthetic resin, a conductive resin such as polyethylene dioxythiophene, and the like. Between the layers 24A and 24B, resistive layers 25A and 25B in which carbon or the like is dispersed in a resin are formed by printing at upper and lower portions to connect the light transmitting electrode layers 24A and 24B.
[0032]
Then, on the light-transmitting electrode layers 24A and 24B, the luminous layer 15, the dielectric layer 16, and the back electrode layer 17 are sequentially printed and formed in the same manner as in the first embodiment. It is formed by printing so as to cover the insulating layer 18.
[0033]
A substantially rectangular electrode portion 23A in which silver or the like is dispersed in a synthetic resin is printed and formed on a tail portion 11A of the base material 11, and a substantially T-shaped electrode portion 23B formed in parallel with the electrode portion 23A transmits light. The electrode element 23A is connected to the right side of the active electrode layer 24A, and the end 17A extending from the back electrode layer 17 is connected to the electrode section 23A, thereby forming the EL element 27.
[0034]
The EL element 27 including the light emitting portion 26A emitting light by the light transmissive electrode layer 24A and the light emitting portion 26B emitting light by the light transmissive electrode layer 24B includes, for example, a light emitting portion 26A such as an LCD of a device. On the back of the display unit (not shown), the light emitting unit 26B is arranged on the back of an operation unit (not shown) such as an operation push button, and is mounted on an electronic device. The lighting device is configured by being connected to an electronic circuit (not shown) of the device by a not shown).
[0035]
In the above configuration, when an AC voltage is applied to the electrode portions 23A and 23B of the EL element 27 from the drive circuit in the electronic circuit of the device, the luminous body layer 15 emits light, and this light moves the display portion and the operation portion of the device backward. However, the voltage applied to the light transmitting electrode layer 24B causes a voltage drop due to the resistance layer 25A, and a reduced voltage is applied, compared to the voltage applied to the light transmitting electrode layer 24A.
[0036]
That is, the light-emitting portion 26A on which the light-transmitting electrode layer 24A is formed emits light brightly, and the light-emitting portion 26B on which the light-transmitting electrode layer 24B is formed emits dark light. The operation unit such as the push button is illuminated slightly dark.
[0037]
As described above, according to the embodiment of the present invention, by forming the resistance layer 25A between the plurality of light-transmitting electrode layers 24A and 24B, it is possible to illuminate a predetermined portion with different brightness with one EL element 27. It is possible to obtain an EL element capable of various illuminations and an illumination device using the same.
[0038]
In the above description, the plurality of electrode patterns 13C to 13F formed on the periphery of the light transmitting electrode layer 12 are connected by the resistance layers 14A to 14C, or the light transmission electrode layers 24A and 24B are connected by the resistance layer 25A. Although the connection configuration is adopted, a plurality of electrode patterns are formed on the periphery of the back electrode layer 17 to connect each electrode pattern with a resistance layer, or the back electrode layer 17 is divided into a plurality and formed. The present invention can be implemented even if an EL element is configured by connecting with a resistance layer.
[0039]
Further, the length of each of the electrode patterns 13C to 13F, the interval between the electrode patterns, and the width of each of the resistance layers 14A to 14D are appropriately set, and the distance between the light-transmitting electrode layers 24A and 24B, the resistance layers 25A and 25A, and the like. By appropriately setting the width of 25B, the brightness of the light emitting units 21A to 21D and the light emitting units 26A and 26B can be set to a desired brightness.
[0040]
Furthermore, although the number of light-emitting portions is four or two, the number of light-emitting portions having different luminances can be reduced to three or four by increasing the number of electrode patterns, light-transmitting electrode layers, and the number of resistive layers connecting them. It is also possible to provide a plurality of locations that exceed each other so that the desired location emits light with different brightness or that the brightness changes continuously.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an advantageous effect that an EL element capable of performing various illuminations and an illumination device using the same can be obtained with a simple configuration using a small number of parts.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an EL element according to a first embodiment of the present invention. FIG. 2 is a plan view of the EL device. FIG. FIG. 5 is a plan view of the device. FIG. 6 is a cross-sectional view of a conventional EL device. FIG. 7 is a plan view of the same.
Reference Signs List 11 Base material 11A Tail portion 12, 24A, 24B Light transmitting electrode layers 13A, 13B, 23A, 23B Electrode portions 13C, 13D, 13E, 13F Electrode patterns 14A, 14B, 14C, 25A Resistive layer 15 Light emitting layer 16 Dielectric Layer 17 Back electrode layer 17A End 18 Insulating layer 20, 27 EL element 21A, 21B, 21C, 21D, 26A, 26B Light emitting section 22A, 22B, 22C, 22D Lighting section 22 Display panel

Claims (3)

光透過性の基材と、この基材下面の所定の箇所に、順次重ねて形成された光透過性電極層と発光体層、及び背面電極層からなり、上記光透過性電極層または上記背面電極層の周縁の少なくとも一辺に、複数の電極パターンを形成すると共に、これらの電極パターン間に抵抗層を形成したEL素子。A light-transmitting substrate, and a light-transmitting electrode layer and a light-emitting layer, which are sequentially formed at predetermined positions on the lower surface of the substrate, and a back electrode layer, wherein the light-transmitting electrode layer or the back surface An EL element in which a plurality of electrode patterns are formed on at least one side of a periphery of an electrode layer, and a resistance layer is formed between these electrode patterns. 光透過性の基材と、この基材下面の所定の箇所に、順次重ねて形成された光透過性電極層と発光体層、及び背面電極層からなり、上記光透過性電極層または上記背面電極層の少なくとも一方を複数個形成すると共に、これらの電極層間に抵抗層を形成したEL素子。A light-transmitting substrate, and a light-transmitting electrode layer and a light-emitting layer, which are sequentially formed at predetermined positions on the lower surface of the substrate, and a back electrode layer, wherein the light-transmitting electrode layer or the back surface An EL element in which at least one of the electrode layers is formed in plural and a resistance layer is formed between these electrode layers. 請求項1または2に記載のEL素子によって、表示素子や表示パネルまたは操作用押釦を照光する照光装置。An illumination device for illuminating a display element, a display panel, or an operation push button with the EL element according to claim 1.
JP2003102615A 2003-04-07 2003-04-07 El element and illumination device using it Pending JP2004311193A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009130132A (en) * 2007-11-22 2009-06-11 Panasonic Electric Works Co Ltd Planar light emission type lighting system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009130132A (en) * 2007-11-22 2009-06-11 Panasonic Electric Works Co Ltd Planar light emission type lighting system

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