JP2005267926A - Double-faced light-emitting organic el panel - Google Patents

Double-faced light-emitting organic el panel Download PDF

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JP2005267926A
JP2005267926A JP2004075574A JP2004075574A JP2005267926A JP 2005267926 A JP2005267926 A JP 2005267926A JP 2004075574 A JP2004075574 A JP 2004075574A JP 2004075574 A JP2004075574 A JP 2004075574A JP 2005267926 A JP2005267926 A JP 2005267926A
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JP4002949B2 (en
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Shigeki Naka
茂樹 中
Hiroyuki Okada
裕之 岡田
Hiroyoshi Mekawa
博義 女川
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Toyama University
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-faced light-emitting organic EL panel capable of appropriately displaying an image or a letter information, without mirror reversing. <P>SOLUTION: Image or a letter information completely different or independent of one other are displayed on front and back face respectively, by arranging an intermediate electrode 3 impressing a scanning signal to the middle part of a first organic EL part 1 and a second organic EL part 2 facing each other, and arranging the a first transparent electrode 4 and a second transparent electrode 5 at the opposite side of the intermediate electrode 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、両面発光有機ＥＬパネルに関するものであり、詳細には、全く異なる独立な画像や文字情報を表裏両面に対し同時に表示することが可能な有機ＥＬパネルに関するものである。   The present invention relates to a double-sided light-emitting organic EL panel, and more particularly, to an organic EL panel capable of simultaneously displaying completely different independent images and character information on both front and back sides.

昨今、有機エレクトロルミネッセンス（ＥＬ）素子は、低駆動電圧、高輝度、超薄型、軽量、フレキシブル等の特徴を有する次世代フラットパネルディスプレイを構築できる素子として注目を集めている。   Recently, an organic electroluminescence (EL) element has been attracting attention as an element capable of constructing a next-generation flat panel display having features such as a low driving voltage, high luminance, ultra-thinness, light weight, and flexibility.

また、両面に発光表示できる有機ＥＬパネルとして透明有機ＥＬ素子が注目され、各所で開発されている。   In addition, transparent organic EL elements have attracted attention as organic EL panels that can display light on both sides and have been developed in various places.

応用例としては、以下のような報告例がある。   Application examples include the following reports.

（１）有機ＥＬ層を透明電極であるＩＴＯで挟み込んだ透明電極有機ＥＬ素子（下記非特許文献１）が開示されている。   (1) A transparent electrode organic EL element (non-patent document 1 below) in which an organic EL layer is sandwiched between ITO, which is a transparent electrode, is disclosed.

（２）両面発光型エレクトロルミネッセンス素子および両面自発光型情報表示素子（下記特許文献１）が開示されている。
特開２０００−５８２６０号公報 Ｇ．Ｇｕ，Ｖ．Ｂｕｌｏｖｉｃ，Ｐ．Ｅ．Ｂｕｒｒｏｗｓ，ａｎｄ Ｓ．Ｒ．Ｆｏｒｒｅｓｔ：Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ Ｌｅｔｔｅｒｓ，６８（１９），ＰＰ．２６０６−２６０８（１９９６） (2) A double-sided light-emitting electroluminescence element and a double-sided self-luminous information display element (the following Patent Document 1) are disclosed.
JP 2000-58260 A G. Gu, V .; Bullov, P.M. E. Burrows, and S.R. R. Forrest: Applied Physics Letters, 68 (19), PP. 2606-2608 (1996)

しかしながら、上記した従来技術（１）は、同一情報を両面に発光するため、裏側から見ると表示が左右反転してしまうといった問題があった。   However, since the above-described prior art (1) emits the same information on both sides, there is a problem that the display is reversed left and right when viewed from the back side.

また、上記した従来技術（２）は、特定パターンの標識板を透明電極上に設けるため特定のパターンの表示に限られる。   Further, the above-described conventional technique (2) is limited to display of a specific pattern because a marker plate having a specific pattern is provided on the transparent electrode.

上記した透明ＥＬ素子を用いた従来の有機ＥＬパネルは、例えば、内外に画面を有する携帯電話機等に応用される場合、通常利用時の内側ウィンドウの表示と待機時の外側ウィンドウの表示情報を使い分けるという方法を用いていた。つまり、このような従来方式では、画像を両面へ発光する場合、同一情報を両側に発光するため、裏側から見ると表示が左右反転してしまうという問題があり、両面同時表示が必要な文字情報表示板や対面型ディスプレイに応用するには画像や文字情報の表示に問題があった。   For example, when the conventional organic EL panel using the transparent EL element described above is applied to a mobile phone having a screen inside and outside, the display of the inner window during normal use and the display information of the outer window during standby are properly used. Was used. That is, in such a conventional method, when the image is emitted on both sides, the same information is emitted on both sides, so there is a problem that the display is reversed left and right when viewed from the back side, character information that requires simultaneous display on both sides When applied to a display board or a face-to-face display, there was a problem in displaying images and text information.

また、これらの上記した従来技術は、片面のみに情報表示が必要な場合においても両面に発光することから、裏側に放出された分が光エネルギー的に無駄になるといった問題があった。   In addition, these conventional techniques have a problem in that light emitted from the back side is wasted in terms of light energy even when information display is required on only one side.

本発明は、上記状況に鑑みて、左右反転することなく、画像や文字情報の両面同時表示を的確に行うことができる両面発光有機ＥＬパネルを提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide a double-sided light-emitting organic EL panel that can accurately display both sides of an image and text information without flipping left and right.

本発明は、上記目的を達成するために、
〔１〕両面発光有機ＥＬパネルにおいて、第１の有機ＥＬ部と第２の有機ＥＬ部との対向する中央部に走査信号を印加する中間電極を配置し、前記中間電極とは第１、第２の有機ＥＬ部を挟んで反対側に第１の透明電極と第２の透明電極をそれぞれ配置し、全く異なる独立な画像や文字情報を表裏両面に対し同時に表示可能にすることを特徴とする。 In order to achieve the above object, the present invention provides
[1] In a double-sided light emitting organic EL panel, an intermediate electrode for applying a scanning signal is disposed at a central portion where the first organic EL portion and the second organic EL portion are opposed to each other. The first transparent electrode and the second transparent electrode are disposed on opposite sides of the two organic EL portions, respectively, so that completely different independent images and character information can be simultaneously displayed on both the front and back surfaces. .

〔２〕上記〔１〕記載の両面発光有機ＥＬパネルにおいて、前記有機ＥＬ部は単層、二層、三層以上の多層構造のいずれかの構造を有する有機ＥＬ素子であることを特徴とする。   [2] The double-sided light-emitting organic EL panel according to [1], wherein the organic EL part is an organic EL element having any one of a single layer structure, a two-layer structure, and a multilayer structure of three or more layers. .

〔３〕上記〔１〕記載の両面発光有機ＥＬパネルにおいて、前記中間電極がＡｌ系電極であることを特徴とする。   [3] The double-sided light-emitting organic EL panel according to [1], wherein the intermediate electrode is an Al-based electrode.

〔４〕上記〔１〕記載の両面発光有機ＥＬパネルにおいて、前記中間電極を電子注入電極として使用する場合は、前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して、電子注入を容易にするため、前記第１、第２の有機ＥＬ部と前記中間電極間にＬｉ、Ｍｇ、Ｃａ、Ｃｓ、Ｅｒの単体、又はそれらの化合物を含む材料の挿入により、より多くの電子注入を可能にすることを特徴とする。   [4] In the double-sided light emitting organic EL panel according to the above [1], when the intermediate electrode is used as an electron injection electrode, electron injection is performed with respect to the first organic EL portion and the second organic EL portion. In order to facilitate injection, more electrons are injected by inserting Li, Mg, Ca, Cs, Er alone or a material containing these compounds between the first and second organic EL portions and the intermediate electrode. It is characterized by enabling.

〔５〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、ＩＴＯ又はＩＺＯであることを特徴とする。   [5] In the double-sided light-emitting organic EL panel according to any one of [1] to [4], one or both of the first transparent electrode and the second transparent electrode is ITO or IZO. It is characterized by that.

〔６〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、薄層金属であることを特徴とする。   [6] The double-sided light-emitting organic EL panel according to any one of [1] to [4], wherein one or both of the first transparent electrode and the second transparent electrode is a thin layer metal. It is characterized by that.

〔７〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、Ｃａ薄膜とＡｇ薄膜の積層電極であることを特徴とする。   [7] The double-sided light-emitting organic EL panel according to any one of [1] to [4], wherein one or both of the first transparent electrode and the second transparent electrode are a Ca thin film and an Ag thin film. It is characterized by being a laminated electrode.

〔８〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の両方が、それぞれ前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して正孔注入を行い、前記中間電極が前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して電子注入を行うことを特徴とする。   [8] The double-sided light-emitting organic EL panel according to any one of [1] to [4], wherein both the first transparent electrode and the second transparent electrode are the first organic EL section. In addition, hole injection is performed on the second organic EL unit, and the intermediate electrode performs electron injection on the first organic EL unit and the second organic EL unit.

〔９〕上記〔１〕から〔３〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の両方が、それぞれ前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して電子注入を行い、前記中間電極が前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して正孔注入を行うことを特徴とする。   [9] The double-sided light-emitting organic EL panel according to any one of [1] to [3], wherein both the first transparent electrode and the second transparent electrode are the first organic EL section. The electron injection is performed on the second organic EL portion, and the intermediate electrode performs hole injection on the first organic EL portion and the second organic EL portion.

〔１０〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極が前記第１の有機ＥＬ部に対して正孔注入を行い、前記第２の透明電極が前記第２の有機ＥＬ部に対して電子注入を行い、前記中間電極が前記第１の有機ＥＬ部に対して電子注入を行い、かつ前記第２の有機ＥＬ部に対して正孔注入を行うことを特徴とする。   [10] The double-sided light-emitting organic EL panel according to any one of [1] to [4], wherein the first transparent electrode injects holes into the first organic EL portion, and 2 transparent electrodes inject electrons into the second organic EL part, the intermediate electrode injects electrons into the first organic EL part, and into the second organic EL part Hole injection is performed.

〔１１〕上記〔１〕から〔４〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極が前記第１の有機ＥＬ部に対して電子注入を行い、前記第２の透明電極が前記第２の有機ＥＬ部に対して正孔注入を行い、前記中間電極が前記第１の有機ＥＬ部に対して正孔注入を行い、かつ前記第２の有機ＥＬ部に対して電子注入を行うことを特徴とする。   [11] The double-sided light-emitting organic EL panel according to any one of [1] to [4], wherein the first transparent electrode injects electrons into the first organic EL portion, and the second The transparent electrode injects holes into the second organic EL part, the intermediate electrode injects holes into the first organic EL part, and into the second organic EL part And electron injection.

〔１２〕上記〔１〕から〔１１〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、正孔注入を行う電極と有機ＥＬ部間に、少なくとも１種以上の遷移金属元素を含む酸化物を挿入することを特徴とする。   [12] The double-sided light-emitting organic EL panel according to any one of [1] to [11], wherein the oxide includes at least one transition metal element between the electrode for hole injection and the organic EL part. Is inserted.

〔１３〕上記〔１２〕記載の両面発光有機ＥＬパネルにおいて、遷移金属元素を含む酸化物が半導体的性質を示すことを特徴とする。   [13] The double-sided light emitting organic EL panel according to [12], wherein the oxide containing a transition metal element exhibits semiconducting properties.

〔１４〕上記〔１３〕記載の両面発光有機ＥＬパネルにおいて、酸化物半導体が２．０ｅＶ以上のバンドギャップを持つことを特徴とする。   [14] The double-sided light emitting organic EL panel according to [13], wherein the oxide semiconductor has a band gap of 2.0 eV or more.

〔１５〕上記〔１２〕記載の両面発光有機ＥＬパネルにおいて、遷移金属元素を含む酸化物が酸化モリブデンであることを特徴とする。   [15] The double-sided light-emitting organic EL panel according to [12], wherein the oxide containing a transition metal element is molybdenum oxide.

〔１６〕上記〔１〕から〔１５〕の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記中間電極が可視光の透過率１０％以下であることを特徴とする。   [16] The double-sided light-emitting organic EL panel according to any one of [1] to [15], wherein the intermediate electrode has a visible light transmittance of 10% or less.

本発明によれば、二つの透明電極間に存在する有機積層の中間部に共通の走査電極を有する両面発光有機ＥＬパネルを提供することができる。中間部に非透明かつ共通の走査電極を有し、同一の走査電圧を印加し、その両側に有機ＥＬ部となる有機層が各々形成され、さらにその外に透明電極を形成することにより、両側に独立した情報表示が可能な有機ＥＬパネルを、１つの基板上に作製することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, the double-sided light emission organic electroluminescent panel which has a common scanning electrode in the intermediate part of the organic laminated layer which exists between two transparent electrodes can be provided. By having a non-transparent and common scanning electrode in the middle part, applying the same scanning voltage, forming an organic layer to be the organic EL part on both sides, and forming a transparent electrode on both sides, thereby forming both sides Thus, an organic EL panel capable of displaying information independently can be manufactured on one substrate.

第１の有機ＥＬ部と第２の有機ＥＬ部との対向する中央部に走査信号を印加する中間電極を配置し、前記中間電極とは反対側に第１の透明電極と第２の透明電極をそれぞれ配置し、全く異なる独立な画像や文字情報を表裏両面に対し表示する。   An intermediate electrode for applying a scanning signal is disposed in the opposite central portion between the first organic EL portion and the second organic EL portion, and the first transparent electrode and the second transparent electrode are disposed on the opposite side of the intermediate electrode. Are arranged, and completely different independent images and character information are displayed on both the front and back sides.

以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

図１は、本発明の両面発光有機ＥＬパネルの構造概念図である。   FIG. 1 is a conceptual diagram of the structure of a double-sided light emitting organic EL panel according to the present invention.

この図において、１は第１の有機ＥＬ部、２は第２の有機ＥＬ部、３は走査信号を印加する中間電極、４は第１の透明電極、５は第２の透明電極である。   In this figure, 1 is a first organic EL part, 2 is a second organic EL part, 3 is an intermediate electrode for applying a scanning signal, 4 is a first transparent electrode, and 5 is a second transparent electrode.

この第１の有機ＥＬ部１，第２の有機ＥＬ部２は、単層、二層、三層以上の多層構造のいずれの有機ＥＬ素子の構造でも作製可能である。中間電極３の電極材料としては、一例としてＡｌ系電極が使用可能である。第１の有機ＥＬ部１、第２の有機ＥＬ部２に対して、電子注入を容易にするため、前記第１、第２の有機ＥＬ部１、２と中間電極３間にＬｉ、Ｍｇ、Ｃａ、Ｃｓ、Ｅｒの単体、又はそれらの化合物を含む材料の挿入により、より多くの電子注入が可能となる。   The first organic EL part 1 and the second organic EL part 2 can be produced by any structure of an organic EL element of a single layer, a double layer, or a multilayer structure of three layers or more. As an example of the electrode material of the intermediate electrode 3, an Al-based electrode can be used. In order to facilitate electron injection into the first organic EL unit 1 and the second organic EL unit 2, Li, Mg, and the like are interposed between the first and second organic EL units 1 and 2 and the intermediate electrode 3. More electrons can be injected by inserting a material containing Ca, Cs, Er alone or a compound thereof.

例えば、中間電極３を電子注入電極として使用する場合は、第１の有機ＥＬ部１，第２の有機ＥＬ部２と中間電極３間にＬｉＦ、Ｃｓ、Ｍｇ、Ｃａ、ＥｒＦ3 、Ｃｓ2 Ｏ、ＣｓＴｅ等、種々の材料を挿入することにより、より多くの電子注入が可能となる。 For example, when the intermediate electrode 3 is used as an electron injection electrode, LiF, Cs, Mg, Ca, ErF 3 , Cs 2 O between the first organic EL part 1, the second organic EL part 2 and the intermediate electrode 3 are used. More electrons can be injected by inserting various materials such as CsTe.

第１の透明電極４、第２の透明電極５としては、代表的なＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘｉｄｅ）やＩＺＯ（Ｉｎｄｉｕｍ Ｚｉｎｃ Ｏｘｉｄｅ）、ＣａとＡｇの積層電極等が使用可能である。また、薄層金属を用いることでも発光を得ることが可能である。   As the 1st transparent electrode 4 and the 2nd transparent electrode 5, typical ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), the laminated electrode of Ca and Ag, etc. can be used. Further, light emission can be obtained by using a thin layer metal.

正孔注入を行う電極と有機ＥＬ部間に、少なくとも１種以上の遷移金属元素を含む酸化物を挿入することで正孔注入が容易になる。また、半導体的性質を示す酸化物としては、ＴｉＯ2 （３．０ｅＶ）、Ｆｅ2 Ｏ3 （２．２ｅＶ）、Ｃｕ2 Ｏ（２．２ｅＶ）、ＺｒＯ2 （５．０ｅＶ）、Ｎｂ2 Ｏ3 （３．０ｅＶ）、ＭｏＯ3 （３．０ｅＶ）、ＷＯ3 （２．７ｅＶ）、ＳｒＴｉＯ3 （３．２ｅＶ）、Ｆｅ2 ＴｉＯ3 （２．８ｅＶ）、ＢａＴｉＯ3 （３．３ｅＶ）、ＣａＴｉＯ3 （３．４ｅＶ）、ＫＴａＯ3 （３．５ｅＶ）、ＦｅＴｉＯ3 （２．８ｅＶ）等が使用可能である。なお、括弧内はそれぞれバンドギャップの値を示す。 Hole injection is facilitated by inserting an oxide containing at least one transition metal element between the electrode that performs hole injection and the organic EL portion. As oxides exhibiting semiconducting properties, TiO 2 (3.0 eV), Fe 2 O 3 (2.2 eV), Cu 2 O (2.2 eV), ZrO 2 (5.0 eV), Nb 2 O 3 (3.0 eV), MoO 3 (3.0 eV), WO 3 (2.7 eV), SrTiO 3 (3.2 eV), Fe 2 TiO 3 (2.8 eV), BaTiO 3 (3.3 eV), CaTiO 3 (3.4 eV), KTaO 3 (3.5 eV), FeTiO 3 (2.8 eV), etc. can be used. The values in parentheses indicate the band gap values.

図２は本発明の第１実施例を示す両面発光有機ＥＬパネルの断面図である。   FIG. 2 is a sectional view of a double-sided light emitting organic EL panel showing a first embodiment of the present invention.

第１実施例として、有機ＥＬ部１０（図１の第１の有機ＥＬ部１および第２の有機ＥＬ部２に対応）については、図２に示すように、ガラス基板１１上にＩＴＯ膜１２／α−ＮＰＤ膜１３（５０ｎｍ）／Ａｌｑ3 膜１４（５０ｎｍ）／ＥｒＦ3 膜１５（０．５ｎｍ）／ＡｌＮｄ膜１６（７０ｎｍ）／ＩＺＯ膜１７（５０ｎｍ）／α−ＮＰＤ膜１８（１００ｎｍ）／Ａｌｑ3 膜１９（５０ｎｍ）／ＬｉＦ膜２０（１ｎｍ）／Ａｌ電極２１（１０ｎｍ）の構造を作製した。 As a first embodiment, the organic EL unit 10 (corresponding to the first organic EL unit 1 and the second organic EL unit 2 in FIG. 1) is formed on an ITO film 12 on a glass substrate 11 as shown in FIG. / Α-NPD film 13 (50 nm) / Alq 3 film 14 (50 nm) / ErF 3 film 15 (0.5 nm) / AlNd film 16 (70 nm) / IZO film 17 (50 nm) / α-NPD film 18 (100 nm) A structure of / Alq 3 film 19 (50 nm) / LiF film 20 (1 nm) / Al electrode 21 (10 nm) was produced.

ここで、ＡｌＮｄ膜１６は中間電極（図１の中間電極３に対応）として作用し、これを厚膜化することにより、反射電極とし、単体Ａｌ薄膜を用いた場合に比べて１／２の平坦性が得られ、デバイスの短絡を防ぐことができた。   Here, the AlNd film 16 acts as an intermediate electrode (corresponding to the intermediate electrode 3 in FIG. 1). By thickening the AlNd film 16, the reflective electrode is used, and the AlNd film 16 is ½ of the case where a single Al thin film is used. Flatness was obtained, and a short circuit of the device could be prevented.

さらに、Ａｌ電極２１（図１の第２の透明電極５に対応）は薄層化することで半透明化した。ここで、最上部のＡｌ電極２１の代わりにＩＺＯを単に通常のスパッタにより形成すると、上部デバイスの短絡が見られた。下部デバイスは、形成後スパッタを行っても特性上に変化はなかった。これは、フローティング電極のチャージアップによるものと考えられる。   Furthermore, the Al electrode 21 (corresponding to the second transparent electrode 5 in FIG. 1) was made translucent by thinning it. Here, when IZO was simply formed by ordinary sputtering instead of the uppermost Al electrode 21, a short circuit of the upper device was observed. Even if the lower device was sputtered after formation, the characteristics were not changed. This is considered to be due to the charge-up of the floating electrode.

デバイス特性としては、上部デバイス、下部デバイスとも独立した発光が確認された。また、特性は、下部デバイスの方が良好であり、輝度２，２４４ｃｄ／ｍ2 （＠１００ｍＡ／ｃｍ2 ）が得られた。 As device characteristics, light emission independent of the upper device and the lower device was confirmed. Further, the lower device had better characteristics, and a luminance of 2,244 cd / m 2 (@ 100 mA / cm 2 ) was obtained.

次に、本発明の第２実施例について説明する。   Next, a second embodiment of the present invention will be described.

第２実施例として、有機ＥＬ部１０（図１の第１の有機ＥＬ部１および第２の有機ＥＬ部２に対応）については、図３に示すように、ガラス基板１１上にＩＴＯ膜１２／α−ＮＰＤ膜１３（５０ｎｍ）／Ａｌｑ3 膜１４（５０ｎｍ）／ＥｒＦ3 膜１５（０．５ｎｍ）／ＡｌＮｄ膜１６（７０ｎｍ）／ＩＺＯ膜１７（２００ｎｍ）／α−ＮＰＤ膜１８（１００ｎｍ）／Ａｌｑ3 膜１９（５０ｎｍ）／Ｃａ膜３１（１０ｎｍ）／Ａｇ膜３２（１０ｎｍ）の積層構造を作製した。 As a second embodiment, the organic EL unit 10 (corresponding to the first organic EL unit 1 and the second organic EL unit 2 in FIG. 1) is formed on an ITO film 12 on a glass substrate 11 as shown in FIG. / Α-NPD film 13 (50 nm) / Alq 3 film 14 (50 nm) / ErF 3 film 15 (0.5 nm) / AlNd film 16 (70 nm) / IZO film 17 (200 nm) / α-NPD film 18 (100 nm) A laminated structure of / Alq 3 film 19 (50 nm) / Ca film 31 (10 nm) / Ag film 32 (10 nm) was produced.

この実施例による素子の特性を図４に示す。   The characteristics of the device according to this example are shown in FIG.

第１の有機ＥＬ部に４６６ｍＡ／ｃｍ2 の電流を流したところ、８，１２６ｃｄ／ｍ2 の発光輝度が得られた。また、第２の有機ＥＬ部に２８７ｍＡ／ｃｍ2 の電流を流したところ、７，１４１ｃｄ／ｍ2 の発光輝度が得られた。 When a current of 466 mA / cm 2 was passed through the first organic EL part, an emission luminance of 8,126 cd / m 2 was obtained. Further, when a current of 287 mA / cm 2 was passed through the second organic EL portion, a light emission luminance of 7,141 cd / m 2 was obtained.

次に、本発明の第３実施例について説明する。第３実施例として、有機ＥＬ部１０（図１の第１の有機ＥＬ部および第２の有機ＥＬ部２に対応）については、図５に示すように、ガラス基板１１上にＩＴＯ膜１２／α−ＮＰＤ膜１３（５０ｎｍ）／Ａｌｑ3 膜１４（５０ｎｍ）／ＥｒＦ3 膜１５（０．５ｎｍ）／ＡｌＮｄ膜１６（７０ｎｍ）／ＭｏＯ3 膜３３（５ｎｍ）／α−ＮＰＤ膜１８（１００ｎｍ）／Ａｌｑ3 膜１９（５０ｎｍ）／Ｃａ膜３１（１０ｎｍ）／Ａｇ膜３２（１０ｎｍ）の積層構造を作製した。第１の有機ＥＬ部に１４．４Ｖの電圧を印加したところ、３７３ｍＡ／ｃｍ2 の電流が流れ、６７００ｃｄ／ｃｍ2 の輝度が得られた。また、第２の有機ＥＬ部に１２．８Ｖの電圧を印加したところ、５００ｍＡ／ｃｍ2 の電流が流れ、１０１０ｃｄ／ｃｍ2 の輝度が得られた。 Next, a third embodiment of the present invention will be described. As a third embodiment, for the organic EL unit 10 (corresponding to the first organic EL unit and the second organic EL unit 2 in FIG. 1), as shown in FIG. α-NPD film 13 (50 nm) / Alq 3 film 14 (50 nm) / ErF 3 film 15 (0.5 nm) / AlNd film 16 (70 nm) / MoO 3 film 33 (5 nm) / α-NPD film 18 (100 nm) A laminated structure of / Alq 3 film 19 (50 nm) / Ca film 31 (10 nm) / Ag film 32 (10 nm) was produced. When a voltage was applied to 14.4V to the first organic EL unit, current flows in 373mA / cm 2, the luminance of 6700cd / cm 2 was obtained. When a voltage of 12.8 V was applied to the second organic EL part, a current of 500 mA / cm 2 flowed, and a luminance of 1010 cd / cm 2 was obtained.

図６は本発明の第４実施例の両面発光有機ＥＬパネルを上部からみた図である。   FIG. 6 is a top view of a double-sided light emitting organic EL panel according to a fourth embodiment of the present invention.

この図において、第１の透明電極４と第２の透明電極５は重ねて記載しているが、必ずしも重なっている必要はない。走査信号を印加する中間電極３は第１の透明電極４と第２の透明電極５の両方と交差するように配置する。簡単のため第１の有機ＥＬ部と第２の有機ＥＬ部は省いてある。第１の透明電極４と第２の透明電極５をそれぞれ第１の有機ＥＬ部と第２の有機ＥＬ部の陽極として、また走査信号を印加する中間電極３を第１の有機ＥＬ部と第２の有機ＥＬ部の陰極として使用した場合の両面発光有機ＥＬパネルの駆動波形の例を図７に示す。図７において、図７（ａ）は第１の透明電極に印加されるデータ信号を、図７（ｂ）は第２の透明電極に印加されるデータ信号を、図７（ｃ）は中間電極１に印加される走査信号を、図７（ｄ）は中間電極２に印加される走査信号を、図７（ｅ）は中間電極ｎに印加される走査信号をそれぞれ示している。   In this figure, the first transparent electrode 4 and the second transparent electrode 5 are shown overlapping, but need not necessarily overlap. The intermediate electrode 3 to which the scanning signal is applied is arranged so as to intersect with both the first transparent electrode 4 and the second transparent electrode 5. For simplicity, the first organic EL part and the second organic EL part are omitted. The first transparent electrode 4 and the second transparent electrode 5 are used as anodes of the first organic EL unit and the second organic EL unit, respectively, and the intermediate electrode 3 for applying a scanning signal is used as the first organic EL unit and the first organic EL unit. FIG. 7 shows an example of the driving waveform of the double-sided light emitting organic EL panel when used as the cathode of the organic EL section 2. 7A shows a data signal applied to the first transparent electrode, FIG. 7B shows a data signal applied to the second transparent electrode, and FIG. 7C shows an intermediate electrode. FIG. 7D shows a scanning signal applied to the intermediate electrode 2, and FIG. 7E shows a scanning signal applied to the intermediate electrode n.

基本は線順次駆動であるが、第１の透明電極に印加するデータ信号と第２の透明電極に印加するデータ信号はそれぞれ任意に印加することが可能である。任意の画素の第１の透明電極に電位Ｖ、走査信号を印加する中間電極に０が印加されたときは第１の有機ＥＬ部にＶの電圧が印加され、第１の有機ＥＬ部から発光が得られる。   Basically, line sequential driving is used, but a data signal applied to the first transparent electrode and a data signal applied to the second transparent electrode can be applied arbitrarily. When a potential V is applied to the first transparent electrode of any pixel and 0 is applied to the intermediate electrode that applies the scanning signal, a voltage of V is applied to the first organic EL section, and light is emitted from the first organic EL section. Is obtained.

また、第２の透明電極５に電位Ｖ、走査信号を印加する中間電極３に０が印加されたときは第２の有機ＥＬ部にＶの電圧が印加され、第２の有機ＥＬ部から発光が得られる。これ以外の電位が各電極に印加された場合は発光が得られない。第１の透明電極４に印加するデータ信号と第２の透明電極５に印加するデータ信号とをそれぞれ独立にかつ任意に選択し、走査信号を印加する中間電極３に走査信号を印加することによって、第１の有機ＥＬ部と第２の有機ＥＬ部からそれぞれ独立な画像が表示可能である。   Further, when the potential V is applied to the second transparent electrode 5 and 0 is applied to the intermediate electrode 3 that applies the scanning signal, a voltage V is applied to the second organic EL portion, and light is emitted from the second organic EL portion. Is obtained. When a potential other than this is applied to each electrode, light emission cannot be obtained. By selecting the data signal applied to the first transparent electrode 4 and the data signal applied to the second transparent electrode 5 independently and arbitrarily, and applying the scanning signal to the intermediate electrode 3 to which the scanning signal is applied Independent images can be displayed from the first organic EL unit and the second organic EL unit.

なお、第１の透明電極４、第２の透明電極５はその抵抗の低減のために、第１の透明電極４、第２の透明電極５上に光の取り出しを妨げない程度にＡｌやＣｒ等の不透明金属を補助配線として形成することも可能である。   The first transparent electrode 4 and the second transparent electrode 5 are made of Al or Cr so as not to interfere with light extraction on the first transparent electrode 4 and the second transparent electrode 5 in order to reduce the resistance. It is also possible to form an opaque metal such as an auxiliary wiring.

また、第４実施例において、線順次駆動について示したが、各画素に薄膜トランジスタを取り付けアクティブ駆動させることも可能である。   In the fourth embodiment, line sequential driving has been described. However, it is also possible to attach a thin film transistor to each pixel and perform active driving.

さらに、生産コスト低減、極薄構造による省スペース、超軽量の特徴を有するディスプレイパネルとして期待できる。   Furthermore, it can be expected as a display panel with reduced production costs, space saving due to an ultra-thin structure, and ultra-light weight.

このようにして、二つの透明電極間に存在する有機積層の中間部に共通の走査電極を有する両面発光有機ＥＬパネルが実現できた。   In this way, a double-sided light-emitting organic EL panel having a common scanning electrode at the intermediate portion of the organic laminate existing between the two transparent electrodes could be realized.

なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。   In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

本発明の両面発光有機ＥＬパネルは、画像の左右反転の問題が解決された、薄型の両面文字情報表示板や、対面型ディスプレイパネル等に利用可能である。また、本発明の両面発光有機ＥＬパネルは、片面のみに情報表示が必要な場合において、片面のみに情報表示することが可能であり、エネルギー損失の問題が解決されたディスプレイパネル等に利用可能である。   The double-sided light-emitting organic EL panel of the present invention can be used for a thin double-sided character information display board, a face-to-face display panel, etc., which has solved the problem of left-right reversal of images. The double-sided light emitting organic EL panel of the present invention can display information only on one side when information display is required only on one side, and can be used for a display panel in which the problem of energy loss is solved. is there.

本発明の両面発光有機ＥＬパネルの構造概念図である。It is a structure conceptual diagram of the double-sided light emitting organic EL panel of this invention. 本発明の第１実施例を示す両面発光有機ＥＬパネルの断面図である。It is sectional drawing of the double-sided light emission organic electroluminescent panel which shows 1st Example of this invention. 本発明の第２実施例を示す両面発光有機ＥＬパネルの断面図である。It is sectional drawing of the double-sided light emission organic electroluminescent panel which shows 2nd Example of this invention. 本発明の第２実施例を示す両面発光有機ＥＬパネルの電流密度に対する輝度特性図である。It is a luminance characteristic figure with respect to the current density of the double-sided light emission organic electroluminescent panel which shows 2nd Example of this invention. 本発明の第３実施例を示す両面発光有機ＥＬパネルの断面図である。It is sectional drawing of the double-sided light emission organic electroluminescent panel which shows 3rd Example of this invention. 本発明の第４実施例の両面発光有機ＥＬパネルを上部からみた図である。It is the figure which looked at the double-sided light emission organic electroluminescent panel of 4th Example of this invention from the upper part. 本発明の第４実施例の両面発光有機ＥＬパネルの駆動波形の例を示す図である。It is a figure which shows the example of the drive waveform of the double-sided light emission organic electroluminescent panel of 4th Example of this invention.

符号の説明Explanation of symbols

１ 第１の有機ＥＬ部
２ 第２の有機ＥＬ部
３ 走査信号を印加する中間電極
４ 第１の透明電極
５ 第２の透明電極
１０ 有機ＥＬ部
１１ ガラス基板
１２ ＩＴＯ膜
１３，１８ α−ＮＰＤ膜
１４，１９ Ａｌｑ3 膜
１５ ＥｒＦ3 膜
１６ ＡｌＮｄ膜
１７ ＩＺＯ膜
２０ ＬｉＦ膜
２１ Ａｌ電極
３１ Ｃａ膜
３２ Ａｇ膜
３３ ＭｏＯ3 膜 DESCRIPTION OF SYMBOLS 1 1st organic EL part 2 2nd organic EL part 3 Intermediate electrode which applies a scanning signal 4 1st transparent electrode 5 2nd transparent electrode 10 Organic EL part 11 Glass substrate 12 ITO film | membrane 13,18 alpha-NPD Films 14, 19 Alq 3 film 15 ErF 3 film 16 AlNd film 17 IZO film 20 LiF film 21 Al electrode 31 Ca film 32 Ag film 33 MoO 3 film

Claims (16)

第１の有機ＥＬ部と第２の有機ＥＬ部との対向する中央部に走査信号を印加する中間電極を配置し、前記中間電極とは第１、第２の有機ＥＬ部を挟んで反対側に第１の透明電極と第２の透明電極をそれぞれ配置し、全く異なる独立な画像や文字情報を表裏両面に対し同時に表示可能にすることを特徴とする両面発光有機ＥＬパネル。   An intermediate electrode for applying a scanning signal is arranged in the opposite central portion of the first organic EL portion and the second organic EL portion, and the intermediate electrode is opposite to the first and second organic EL portions. A double-sided light-emitting organic EL panel characterized in that a first transparent electrode and a second transparent electrode are respectively disposed on the front and back so that completely different independent images and character information can be displayed simultaneously on both the front and back sides. 請求項１記載の両面発光有機ＥＬパネルにおいて、前記有機ＥＬ部は単層、二層、三層以上の多層構造のいずれかの構造を有する有機ＥＬ素子であることを特徴とする両面発光有機ＥＬパネル。   2. The double-sided light-emitting organic EL panel according to claim 1, wherein the organic EL part is an organic EL element having a single-layer structure, a double-layer structure, or a multilayer structure of three or more layers. panel. 請求項１記載の両面発光有機ＥＬパネルにおいて、前記中間電極がＡｌ系電極であることを特徴とする両面発光有機ＥＬパネル。   2. The double-sided light-emitting organic EL panel according to claim 1, wherein the intermediate electrode is an Al-based electrode. 請求項１記載の両面発光有機ＥＬパネルにおいて、前記中間電極を電子注入電極として使用する場合は、前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して、電子注入を容易にするため、前記第１、第２の有機ＥＬ部と前記中間電極間にＬｉ、Ｍｇ、Ｃａ、Ｃｓ、Ｅｒの単体、又はそれらの化合物を含む材料の挿入により、より多くの電子注入を可能にすることを特徴とする両面発光有機ＥＬパネル。   The double-sided light emitting organic EL panel according to claim 1, wherein when the intermediate electrode is used as an electron injection electrode, electron injection is facilitated with respect to the first organic EL portion and the second organic EL portion. Therefore, it is possible to inject more electrons by inserting Li, Mg, Ca, Cs, Er alone or a material containing these compounds between the first and second organic EL portions and the intermediate electrode. A double-sided light-emitting organic EL panel characterized by that. 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、ＩＴＯ又はＩＺＯであることを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein one or both of the first transparent electrode and the second transparent electrode is ITO or IZO. Light-emitting organic EL panel. 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、薄層金属であることを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein one or both of the first transparent electrode and the second transparent electrode is a thin layer metal. Light-emitting organic EL panel. 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の一方、又は両方が、Ｃａ薄膜とＡｇ薄膜の積層電極であることを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein one or both of the first transparent electrode and the second transparent electrode is a laminated electrode of a Ca thin film and an Ag thin film. A double-sided light-emitting organic EL panel characterized by 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の両方が、それぞれ前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して正孔注入を行い、前記中間電極が前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して電子注入を行うことを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein both of the first transparent electrode and the second transparent electrode are the first organic EL unit and the second organic EL, respectively. A double-sided light-emitting organic EL panel, wherein hole injection is performed on an EL section, and the intermediate electrode performs electron injection on the first organic EL section and the second organic EL section. 請求項１から３の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極、前記第２の透明電極の両方が、それぞれ前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して電子注入を行い、前記中間電極が前記第１の有機ＥＬ部、前記第２の有機ＥＬ部に対して正孔注入を行うことを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to any one of claims 1 to 3, wherein both the first transparent electrode and the second transparent electrode are the first organic EL unit and the second organic EL, respectively. A double-sided light emitting organic EL panel wherein electrons are injected into an EL portion, and the intermediate electrode performs hole injection into the first organic EL portion and the second organic EL portion. 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極が前記第１の有機ＥＬ部に対して正孔注入を行い、前記第２の透明電極が前記第２の有機ＥＬ部に対して電子注入を行い、前記中間電極が前記第１の有機ＥＬ部に対して電子注入を行い、かつ前記第２の有機ＥＬ部に対して正孔注入を行うことを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein the first transparent electrode injects holes into the first organic EL portion, and the second transparent electrode Injecting electrons into the second organic EL part, the intermediate electrode injecting electrons into the first organic EL part, and injecting holes into the second organic EL part A double-sided light-emitting organic EL panel characterized by 請求項１から４の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記第１の透明電極が前記第１の有機ＥＬ部に対して電子注入を行い、前記第２の透明電極が前記第２の有機ＥＬ部に対して正孔注入を行い、前記中間電極が前記第１の有機ＥＬ部に対して正孔注入を行い、かつ前記第２の有機ＥＬ部に対して電子注入を行うことを特徴とする両面発光有機ＥＬパネル。   5. The double-sided light-emitting organic EL panel according to claim 1, wherein the first transparent electrode injects electrons into the first organic EL portion, and the second transparent electrode is the first transparent electrode. Injecting holes into the second organic EL portion, the intermediate electrode injecting holes into the first organic EL portion, and injecting electrons into the second organic EL portion. A double-sided light-emitting organic EL panel characterized by 請求項１から１１の何れか一項記載の両面発光有機ＥＬパネルにおいて、正孔注入を行う電極と有機ＥＬ部間に、少なくとも１種以上の遷移金属元素を含む酸化物を挿入することを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to any one of claims 1 to 11, wherein an oxide containing at least one transition metal element is inserted between the electrode for hole injection and the organic EL part. A double-sided organic EL panel. 請求項１２記載の両面発光有機ＥＬパネルにおいて、遷移金属元素を含む酸化物が半導体的性質を示すことを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to claim 12, wherein the oxide containing a transition metal element exhibits semiconducting properties. 請求項１３記載の両面発光有機ＥＬパネルにおいて、酸化物半導体が２．０ｅＶ以上のバンドギャップを持つことを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to claim 13, wherein the oxide semiconductor has a band gap of 2.0 eV or more. 請求項１２記載の両面発光有機ＥＬパネルにおいて、遷移金属元素を含む酸化物が酸化モリブデンであることを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to claim 12, wherein the oxide containing a transition metal element is molybdenum oxide. 請求項１から１５の何れか一項記載の両面発光有機ＥＬパネルにおいて、前記中間電極が可視光の透過率１０％以下であることを特徴とする両面発光有機ＥＬパネル。   The double-sided light-emitting organic EL panel according to any one of claims 1 to 15, wherein the intermediate electrode has a visible light transmittance of 10% or less.
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