JP4905838B2 - Organic EL panel - Google Patents

Organic EL panel Download PDF

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JP4905838B2
JP4905838B2 JP2007272139A JP2007272139A JP4905838B2 JP 4905838 B2 JP4905838 B2 JP 4905838B2 JP 2007272139 A JP2007272139 A JP 2007272139A JP 2007272139 A JP2007272139 A JP 2007272139A JP 4905838 B2 JP4905838 B2 JP 4905838B2
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正寛 皆川
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Nippon Seiki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel capable of suppressing an increase of electric resistance at wiring and forming a barrier rib in a favorable shape. <P>SOLUTION: The organic EL panel is provided with an organic EL element in which an organic layer having at least a luminous layer between a first electrode 1 formed on a substrate and a second electrode 2 formed so as to cross the first electrode 1 is formed in lamination. The second electrode 2 is divided into a line shape by barrier ribs 6 formed so as to cross the first electrode. An auxiliary electrode 3 which is formed of a material with lower electric resistance than that of the first electrode 1 and of which the width is narrower at an opposing place to at least the barrier rib 6 than at the other place is formed on the first electrode 1. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、有機ＥＬ（エレクトロルミネッセンス）素子を用いた有機ＥＬパネルに関し、特にパッシブ駆動の有機ＥＬパネルに関する。   The present invention relates to an organic EL panel using an organic EL (electroluminescence) element, and more particularly to a passively driven organic EL panel.

従来、自発光素子である有機ＥＬ素子を透光性の基板上に設けてなる有機ＥＬパネルにおいて、その駆動方式としてパッシブ駆動方式が知られている。パッシブ駆動の有機ＥＬパネルは、透光性基板上に第一電極を複数のライン状に形成し、第二電極を前記第一電極と交差するように複数のライン状に形成して前記第一電極と前記第二電極との交差位置を発光画素とするマトリクス構造を有するものである（例えば特許文献１参照）。前記第二電極は、ライン状に形成される隔壁によって分離形成されるのが一般的である。かかる有機ＥＬパネルは、線順次走査された画像が前記表示部に表示される。パッシブ駆動の有機ＥＬパネルは、アクティブ駆動方式と比較して製造が容易であるといった利点がある。   Conventionally, a passive driving method is known as a driving method for an organic EL panel in which an organic EL element which is a self-luminous element is provided on a light-transmitting substrate. In the passive drive organic EL panel, the first electrode is formed in a plurality of lines on the translucent substrate, and the second electrode is formed in a plurality of lines so as to intersect the first electrode. It has a matrix structure in which the intersection position of the electrode and the second electrode is a light emitting pixel (see, for example, Patent Document 1). In general, the second electrode is separated and formed by barrier ribs formed in a line shape. In such an organic EL panel, a line-sequentially scanned image is displayed on the display unit. The passive drive organic EL panel has the advantage that it is easier to manufacture than the active drive system.

近年、情報の多量化及び多様化によってディスプレイにはさらなる大型化・高精細化が求められている。しかし、有機ＥＬ素子の主に陽極となる第一電極に用いられるＩＴＯ等の透光性導電材料は比較的電気抵抗が高く、微細なライン状に形成する場合には電圧降下によって発光画素における輝度ムラなどが生じ、表示品位を低下させるという問題がある。   In recent years, the display has been required to be larger and have higher definition due to the increase and diversification of information. However, a light-transmitting conductive material such as ITO used for the first electrode, which is mainly the anode of the organic EL element, has a relatively high electrical resistance. There is a problem that unevenness occurs and the display quality is lowered.

また、パッシブ駆動の有機ＥＬパネルの電極構造として、例えば特許文献２に開示されるいわゆる多重マトリクス構造が知られている。かかる多重マトリクス構造においても各発光画素間に配置される信号電極（第一電極）の配線部が細くなる部分ができるため、配線抵抗が大きくなるという問題点がある。
特開２００３−１４２２５８号公報 特開２００１−２１７０８１号公報 特開２０００−２１５６６号公報 特開２００３−２５７６６３号公報 As an electrode structure of a passively driven organic EL panel, for example, a so-called multiple matrix structure disclosed in Patent Document 2 is known. Even in such a multi-matrix structure, there is a problem that the wiring resistance of the signal electrode (first electrode) disposed between the light emitting pixels is increased, resulting in increased wiring resistance.
JP 2003-142258 A Japanese Patent Laid-Open No. 2001-217081 Japanese Patent Application Laid-Open No. 2000-21565 JP 2003-257663 A

上記の問題点に対して、配線抵抗を小さくするために前記第一電極上に電気抵抗の小さい補助電極を配置する方法が知られている（例えば特許文献３参照）。しかし、前記補助電極を形成した場合、前記第二電極を分離形成するための前記隔壁をフォトリソグラフィー法によって形成する場合、パネル上面から照射された紫外線が前記補助電極によって反射され前記隔壁としての良好な形状（断面が逆テーパー状）が得られないといった問題点があった。また、特許文献４において、前記隔壁との交差個所において前記補助電極を分断する方法が開示されているが、前記補助配線を分断して断続的な構造とすると配線抵抗の低減が不十分であるという問題点があった。   In order to reduce the wiring resistance, a method of arranging an auxiliary electrode having a low electric resistance on the first electrode is known (for example, see Patent Document 3). However, when the auxiliary electrode is formed, when the partition for separating and forming the second electrode is formed by a photolithography method, the ultraviolet light irradiated from the upper surface of the panel is reflected by the auxiliary electrode, and the partition is good. There is a problem that a simple shape (cross section is reverse tapered) cannot be obtained. Further, Patent Document 4 discloses a method of dividing the auxiliary electrode at an intersection with the partition wall. However, if the auxiliary wiring is divided to form an intermittent structure, the wiring resistance is not sufficiently reduced. There was a problem.

本発明は、前述した問題点に着目し、配線部による電気抵抗の上昇を抑制し、また、隔壁を良好な形状で形成することが可能な有機ＥＬパネルを提供することを目的とする。   An object of the present invention is to provide an organic EL panel capable of suppressing an increase in electrical resistance due to a wiring portion and capable of forming a partition wall in a favorable shape, paying attention to the above-described problems.

本発明は、前記課題を解決するために、基板上に互いに交差するように対向配置される第一電極と第二電極との間に少なくとも発光層を有する有機層を積層形成してなる有機ＥＬ素子を備えた有機ＥＬパネルであって、前記第二電極は、前記第一電極と交差するように形成される隔壁によってライン状に分離形成され、前記第一電極上に、前記第一電極よりも電気抵抗の低い材料からなり少なくとも前記隔壁との対向個所に他の個所よりも幅が細い幅細部を有する補助電極が連続的に形成されてなることを特徴とする。 In order to solve the above-described problems, the present invention provides an organic EL in which an organic layer having at least a light-emitting layer is formed between a first electrode and a second electrode that are arranged to face each other so as to cross each other on a substrate. An organic EL panel including an element, wherein the second electrode is separated and formed in a line shape by a partition formed so as to intersect the first electrode, and is formed on the first electrode from the first electrode. Further , an auxiliary electrode made of a material having a low electric resistance is formed continuously at least at a portion facing the partition wall and having a narrower width than other portions.

また、前記第一電極は、前記第二電極との交差方向に複数配置される画素電極と前記画素電極に接続される配線電極とを有し、前記補助電極は、前記配線電極上に形成されてなることを特徴とする。   The first electrode includes a plurality of pixel electrodes arranged in a direction intersecting the second electrode and a wiring electrode connected to the pixel electrode, and the auxiliary electrode is formed on the wiring electrode. It is characterized by.

また、前記第一電極は、それぞれ異なる前記配線電極と接続される前記画素電極が前記第二電極との交差方向に複数個隣り合って１ユニットを構成するように形成され、前記第二電極は、前記画素電極の１ユニットと対向するように形成されてなることを特徴とする。   The first electrode is formed such that a plurality of pixel electrodes connected to different wiring electrodes are adjacent to each other in a crossing direction with the second electrode to constitute one unit, and the second electrode is The pixel electrode is formed so as to face one unit.

本発明は、有機ＥＬ素子を用いた特にパッシブ駆動の有機ＥＬパネルに関するものであり、配線部による電気抵抗の上昇を抑制し、また、隔壁を良好な形状に形成することが可能となる。   The present invention relates to a passively driven organic EL panel using an organic EL element, and it is possible to suppress an increase in electrical resistance due to a wiring portion and to form a partition wall in a good shape.

以下、本実施形態である有機ＥＬパネルについて説明する。有機ＥＬパネルは、その基本構成として、透光性のガラス基板上に形成される第一電極と第二電極との間に少なくとも発光層を有する有機層を積層形成してなるものである。   Hereinafter, the organic EL panel according to the present embodiment will be described. The organic EL panel has a basic configuration in which an organic layer having at least a light emitting layer is laminated between a first electrode and a second electrode formed on a light-transmitting glass substrate.

図１は、前記有機ＥＬパネルの電極構造を示すものである。前記有機ＥＬパネルは、画素電極１ａと配線電極１ｂとを有し陽極となる信号電極（第一電極）１と、信号電極１と交差するように形成され陰極となる走査電極（第二電極）２と、を有する。前記有機ＥＬパネルは、画素電極１ａと走査電極２との対向（交差）個所を発光画素（有機ＥＬ素子）とし、この発光画素をマトリクス状に複数配置して発光部を構成している。なお、走査電極２の下方には発光画素となる部分を除いて絶縁層が形成されており、信号電極１と走査電極２との短絡を防止している。また、図２は前記有機ＥＬパネルの要部拡大図であり、信号電極１の配線電極１ｂ上には補助電極３が形成されている。また、図３は、前記有機ＥＬパネルの要部断面図であり、４は前述の短絡防止用の絶縁層であり、５は少なくとも発光層を含む有機層であり、６は走査電極２を分離形成するためのリブ（隔壁）であり、７はガラス基板である。   FIG. 1 shows an electrode structure of the organic EL panel. The organic EL panel includes a pixel electrode 1a and a wiring electrode 1b, a signal electrode (first electrode) 1 serving as an anode, and a scanning electrode (second electrode) formed so as to intersect the signal electrode 1 and serving as a cathode. 2 and. In the organic EL panel, a light emitting pixel (organic EL element) is formed at an opposing (crossing) portion between the pixel electrode 1a and the scanning electrode 2, and a plurality of the light emitting pixels are arranged in a matrix to form a light emitting unit. Note that an insulating layer is formed below the scanning electrode 2 except for a portion that becomes a light emitting pixel, and a short circuit between the signal electrode 1 and the scanning electrode 2 is prevented. FIG. 2 is an enlarged view of a main part of the organic EL panel. An auxiliary electrode 3 is formed on the wiring electrode 1 b of the signal electrode 1. 3 is a cross-sectional view of the main part of the organic EL panel, 4 is an insulating layer for preventing short circuit, 5 is an organic layer including at least a light emitting layer, and 6 is a scan electrode 2 separated. Ribs (partition walls) for forming, and 7 is a glass substrate.

信号電極１は、複数列のライン状に形成され、列方向（走査電極２との交差方向）に複数配置される画素電極１ａと、画素電極１ａに接続される配線電極１ｂとをそれぞれ有するものである。信号電極１は、画素電極１ａの列方向に隣り合う複数個（本実施形態では２個）を１ユニットとし、１ユニット内の画素電極１ａがそれぞれ異なる配線電極１ｂと接続されるように形成されている。すなわち信号電極１は、２ラインで前記発光画素の１列を構成するように形成される。   The signal electrode 1 is formed in a plurality of lines and has a plurality of pixel electrodes 1a arranged in the column direction (crossing direction with the scanning electrode 2) and a wiring electrode 1b connected to the pixel electrode 1a. It is. The signal electrode 1 is formed so that a plurality of (two in the present embodiment) adjacent to each other in the column direction of the pixel electrodes 1a constitute one unit, and the pixel electrodes 1a in one unit are connected to different wiring electrodes 1b. ing. That is, the signal electrode 1 is formed so as to constitute one column of the light emitting pixels by two lines.

画素電極１ａは、例えばＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘｉｄｅ）等の透光性の導電材料をスパッタリング法等の方法で前記ガラス基板上に層状に形成し、例えばフォトリソグラフィー法にて所定形状にパターニングしてなるものである。本実施形態においては、各画素電極１ａは略矩形状に形成され、ガラス基板７上にマトリクス状に配置される。   The pixel electrode 1a is formed by forming a light-transmitting conductive material such as ITO (Indium Tin Oxide) in a layer shape on the glass substrate by a sputtering method or the like, and patterning it into a predetermined shape by, for example, a photolithography method. Is. In the present embodiment, each pixel electrode 1 a is formed in a substantially rectangular shape, and is arranged on the glass substrate 7 in a matrix.

配線電極１ｂは、画素電極１ａと同材料からなり、画素電極１ａとともに形成されるものである。配線電極１ｂは、画素電極１ａの各列の間に走査電極２と交差するように配線形成され、画素電極１ａの各列において各画素電極１ａと交互に接続される。また、配線電極１ｂはそれぞれ前記ガラス基板の一辺側に向けて配線され、信号電極側駆動回路８に接続される。信号電極側駆動回路８は、後述する走査電極側駆動回路９による走査電極２の順次走査に応じて所定の画像を表示するべく信号電極１に給電するものである。   The wiring electrode 1b is made of the same material as the pixel electrode 1a and is formed together with the pixel electrode 1a. The wiring electrodes 1b are formed between the columns of the pixel electrodes 1a so as to intersect the scanning electrodes 2, and are alternately connected to the pixel electrodes 1a in each column of the pixel electrodes 1a. The wiring electrodes 1b are wired toward one side of the glass substrate and connected to the signal electrode side driving circuit 8. The signal electrode side drive circuit 8 supplies power to the signal electrode 1 so as to display a predetermined image in accordance with the sequential scanning of the scan electrodes 2 by the scan electrode side drive circuit 9 described later.

走査電極２は、アルミニウム（Ａｌ）やマグネシウム（Ｍｇ）、コバルト（Ｃｏ）、リチウム（Ｌｉ）、金（Ａｕ）、亜鉛（Ｚｎ）あるいはそれらの合金等の信号電極１よりも導電率が高い金属性導電材料を蒸着法等によって層状に形成するとともに、絶縁性の樹脂材料をライン状に形成してなるリブ６によって複数行のライン状に分離形成してなるものである。走査電極２は、それぞれ信号電極１と交差し、列方向において画素電極１ａの１ユニットと対向するように形成される。また、走査電極２はそれぞれ走査電極側駆動回路９に接続される。走査電極側駆動回路９は、所定のＤｕｔｙ比で走査電極２を順次走査するものである。   The scanning electrode 2 is a metal having higher conductivity than the signal electrode 1 such as aluminum (Al), magnesium (Mg), cobalt (Co), lithium (Li), gold (Au), zinc (Zn), or an alloy thereof. The conductive conductive material is formed in layers by vapor deposition or the like, and the insulating resin material is separated and formed in a plurality of lines by ribs 6 formed in a line. Each scanning electrode 2 intersects with the signal electrode 1 and is formed so as to face one unit of the pixel electrode 1a in the column direction. The scan electrodes 2 are connected to the scan electrode side drive circuit 9 respectively. The scan electrode side drive circuit 9 sequentially scans the scan electrodes 2 at a predetermined duty ratio.

補助電極３は、クロム（Ｃｒ）、モリブデン（Ｍｏ）、アルミニウム（Ａｌ）、銅（Ｃｕ）あるいはそれらの合金等の画素電極１ａの構成材料よりも電気抵抗の低い材料をスパッタリング法等の方法で層状に形成し、例えばフォトリソグラフィー法にて所定形状にパターニングしてなるものである。なお、補助電極３は異種材料を複数層形成してなるものであってもよい。補助電極３は、各配線電極１ｂ上に形成され、リブ６との対向個所において他の個所よりも幅が細く形成される幅細部３ａを有する。   The auxiliary electrode 3 is made of a material such as chromium (Cr), molybdenum (Mo), aluminum (Al), copper (Cu), or an alloy thereof having a lower electric resistance than the constituent material of the pixel electrode 1a by a method such as sputtering. It is formed in a layer and is patterned into a predetermined shape by, for example, a photolithography method. The auxiliary electrode 3 may be formed by forming a plurality of layers of different materials. The auxiliary electrode 3 is formed on each wiring electrode 1 b, and has a width detail 3 a that is formed to be narrower than other portions at a position facing the rib 6.

かかる有機ＥＬパネルは、いわゆる多重マトリクス構造となるものであり、走査電極２の１ライン走査時に発光画素の２行が点灯制御されるものである。   Such an organic EL panel has a so-called multiple matrix structure, and two rows of light emitting pixels are controlled to be turned on when the scanning electrode 2 performs one line scanning.

本実施形態の有機ＥＬパネルは、補助電極３によって配線抵抗の上昇を抑制することができる。また、補助電極３は、リブ６との対向個所を他の個所よりも幅の細い幅細部３ａとすることによって、補助電極３が連続的に形成されることから配線抵抗を許容範囲内に抑えることができ、また、リブ６の形成時に紫外線の反射する面積が低減されることからリブ６を良好な形状に形成することができる。   In the organic EL panel of the present embodiment, an increase in wiring resistance can be suppressed by the auxiliary electrode 3. In addition, the auxiliary electrode 3 is formed continuously by forming the portion facing the rib 6 with a narrow width detail 3a that is narrower than the other portions, so that the wiring resistance is kept within an allowable range. In addition, since the area where ultraviolet rays are reflected is reduced when the rib 6 is formed, the rib 6 can be formed in a good shape.

また、本実施形態においては、２個の画素電極１ａで１ユニットを構成し、１ユニット内の各画素電極１ａを異なる配線電極１ｂに接続するものであったが、本発明は、３個以上の画素電極で１ユニットを構成するものであっても良い。すなわち、走査電極の１ラインに対して異なる配線電極に接続される３つ以上の画素電極が対向して配置される構成とするものであっても良い。また、信号電極１を単にライン状に形成する単純マトリクス構造であっても良い。この場合、信号電極１の発光画素に対応しない個所（例えば端部）上に補助電極が形成されることとなる。これらの構成においても本発明を適用することによって、同様の効果を得ることができる。   In this embodiment, two pixel electrodes 1a constitute one unit, and each pixel electrode 1a in one unit is connected to a different wiring electrode 1b. These pixel electrodes may constitute one unit. That is, a configuration in which three or more pixel electrodes connected to different wiring electrodes with respect to one line of the scanning electrodes are arranged to face each other may be used. Further, a simple matrix structure in which the signal electrodes 1 are simply formed in a line shape may be used. In this case, the auxiliary electrode is formed on a portion (for example, an end portion) that does not correspond to the light emitting pixel of the signal electrode 1. The same effect can be obtained by applying the present invention to these configurations.

本発明の実施形態である有機ＥＬパネルの電極構造を示す概観図である。It is a general-view figure which shows the electrode structure of the organic electroluminescent panel which is embodiment of this invention. 同上有機ＥＬパネルの要部拡大図である。It is a principal part enlarged view of an organic electroluminescent panel same as the above. 同上有機ＥＬパネルの要部断面図である。It is principal part sectional drawing of an organic electroluminescent panel same as the above.

符号の説明Explanation of symbols

１ 信号電極（第一電極）
１ａ 画素電極
１ｂ 配線電極
２ 走査電極（第二電極）
３ 補助電極
３ａ 幅細部
４ 絶縁層
５ 有機層
６ リブ（隔壁）
７ ガラス基板
８ 信号電極側駆動回路
９ 走査電極側駆動回路 1 Signal electrode (first electrode)
1a Pixel electrode 1b Wiring electrode 2 Scan electrode (second electrode)
3 Auxiliary electrode 3a Width details 4 Insulating layer 5 Organic layer 6 Rib (partition)
7 Glass substrate 8 Signal electrode side drive circuit 9 Scan electrode side drive circuit

Claims (3)

基板上に形成される第一電極とこの第一電極と交差するように形成される第二電極との間に少なくとも発光層を有する有機層を積層形成してなる有機ＥＬ素子を備えた有機ＥＬパネルであって、
前記第二電極は、前記第一電極と交差するように形成される隔壁によってライン状に分離形成され、
前記第一電極上に、前記第一電極よりも電気抵抗の低い材料からなり少なくとも前記隔壁との対向個所に他の個所よりも幅が細い幅細部を有する補助電極が連続的に形成されてなることを特徴とする有機ＥＬパネル。 An organic EL device comprising an organic EL element formed by laminating an organic layer having at least a light emitting layer between a first electrode formed on a substrate and a second electrode formed so as to intersect the first electrode A panel,
The second electrode is separated and formed in a line by a partition formed to intersect the first electrode,
On the first electrode , an auxiliary electrode made of a material having a lower electrical resistance than that of the first electrode is continuously formed at least at a location facing the partition wall and having a narrower width than other locations. An organic EL panel characterized by that. 前記第一電極は、前記第二電極との交差方向に複数配置される画素電極と前記画素電極に接続される配線電極とを有し、
前記補助電極は、前記配線電極上に形成されてなることを特徴とする請求項１に記載の有機ＥＬパネル。 The first electrode has a plurality of pixel electrodes arranged in a direction intersecting the second electrode and a wiring electrode connected to the pixel electrode,
The organic EL panel according to claim 1, wherein the auxiliary electrode is formed on the wiring electrode. 前記第一電極は、それぞれ異なる前記配線電極と接続される前記画素電極が前記第二電極との交差方向に複数個隣り合って１ユニットを構成するように形成され、
前記第二電極は、前記画素電極の１ユニットと対向するように形成されてなることを特徴とする請求項２に記載の有機ＥＬパネル。
The first electrode is formed such that a plurality of pixel electrodes connected to different wiring electrodes are adjacent to each other in the intersecting direction with the second electrode to constitute one unit,
The organic EL panel according to claim 2, wherein the second electrode is formed so as to face one unit of the pixel electrode.
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