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JP4789063B2 - Organic EL panel - Google Patents
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JP4789063B2 - Organic EL panel - Google Patents

Organic EL panel Download PDF

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JP4789063B2
JP4789063B2 JP2006010778A JP2006010778A JP4789063B2 JP 4789063 B2 JP4789063 B2 JP 4789063B2 JP 2006010778 A JP2006010778 A JP 2006010778A JP 2006010778 A JP2006010778 A JP 2006010778A JP 4789063 B2 JP4789063 B2 JP 4789063B2
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electrode
organic
opening
insulating layer
layer
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JP2007194062A (en
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哲也 片桐
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Nippon Seiki Co Ltd
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Description

本発明は、第一電極と第二電極の間に有機層を挟持した有機EL素子を含む積層体を基板上に形成した有機ELパネルに関するものである。   The present invention relates to an organic EL panel in which a laminate including an organic EL element in which an organic layer is sandwiched between a first electrode and a second electrode is formed on a substrate.

従来より、基板上に有機EL素子を形成した有機ELパネルが種々提案されており、例えば特許文献1に開示されている。有機ELパネル1は、ガラス基板2上に積層体3を形成したものであり、この積層体3は、第一電極4,絶縁層5,有機層6,第二電極7を有する(図及び図参照)。
特開2001−68267号公報
Conventionally, various organic EL panels in which organic EL elements are formed on a substrate have been proposed. For example, Patent Document 1 discloses them. The organic EL panel 1 includes a laminated body 3 formed on a glass substrate 2, and the laminated body 3 includes a first electrode 4, an insulating layer 5, an organic layer 6, and a second electrode 7 (see FIG. 6 and FIG. 6 ). (See FIG. 7 ).
JP 2001-68267 A

第一電極4は、ITO(Indium Tin Oxide)からなるものであり、縦方向のストライプ状の陽極部4aと、第二電極7に電気的に接続される陰極端子部4bとを有している。絶縁層5には、マトリクス状に設けられる画素に対応した開口部5aと、陰極端子部4bと第二電極7を導通させるコンタクトホール5cとが形成されている。絶縁層5は、有機層6よりも広い領域に形成されている。有機層6は、蒸着等の方法によって正孔注入層,正孔輸送層,発光層,電子輸送層及び電子注入層を順次形成したものである。第二電極7は、アルミニウム(Al)からなるものであり、横方向のストライプ状になっている。有機ELパネル1の表示領域Sには、画素Pがマトリクス状に設けられており、図示しない駆動回路によって画素Pを各々オン/オフさせ、所望の文字や図形を表示することが可能である。   The first electrode 4 is made of ITO (Indium Tin Oxide), and has a vertical stripe-shaped anode portion 4 a and a cathode terminal portion 4 b electrically connected to the second electrode 7. . In the insulating layer 5, openings 5 a corresponding to pixels provided in a matrix and contact holes 5 c for conducting the cathode terminal portion 4 b and the second electrode 7 are formed. The insulating layer 5 is formed in a wider area than the organic layer 6. The organic layer 6 is formed by sequentially forming a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer by a method such as vapor deposition. The second electrode 7 is made of aluminum (Al) and has a horizontal stripe shape. In the display area S of the organic EL panel 1, pixels P are provided in a matrix. Each pixel P can be turned on / off by a driving circuit (not shown) to display a desired character or figure.

しかしながら、表示領域Sにおける最外周の画素P1は、中央部の画素P2よりも短期間で劣化するという問題を有していた。この問題は、最外周の画素P1では、有機層6が、絶縁層5から発せられる有機ガス(以下、アウトガスと記す)の影響を受けやすいために生じると考えられる。つまり、絶縁層5の開口部5aは一定間隔で設けられており、中央部の画素P2は、所定幅W1の絶縁層5に囲まれているが、最外周の画素P1では、絶縁層5の外縁までの幅W2が前記所定幅W1よりも大きくなるため、絶縁層5から発せられるアウトガスの影響を受けやすい。
本発明は、表示領域における最外周の画素が、中央部の画素よりも短期間で劣化する虞が少ない有機ELパネルを提供するものである。
However, the outermost peripheral pixel P1 in the display region S has a problem that it deteriorates in a shorter period than the central pixel P2. This problem is considered to occur because in the outermost peripheral pixel P1, the organic layer 6 is easily affected by an organic gas emitted from the insulating layer 5 (hereinafter referred to as outgas). That is, the openings 5a of the insulating layer 5 are provided at regular intervals, and the central pixel P2 is surrounded by the insulating layer 5 having a predetermined width W1, but the outermost peripheral pixel P1 has the insulating layer 5 Since the width W2 to the outer edge is larger than the predetermined width W1, the width W2 is easily affected by the outgas emitted from the insulating layer 5.
The present invention provides an organic EL panel in which the outermost peripheral pixel in the display region is less likely to be deteriorated in a shorter period than the central pixel.

本発明は、前記課題を解決するため、請求項1に記載したように、第一電極17とポリイミド系の絶縁材料からなる絶縁層18とリブ部19と有機層20と第二電極21とを有する積層体16を基板15に形成した有機ELパネル14において、前記第一電極17は、ストライプ状に形成された陽極部17aと、前記第二電極21に電気的に接続される陰極端子部17bと、を有し、前記リブ部19は、前記有機層20及び前記第二電極21をストライプ状に分断するように、前記第一電極17の前記陽極部17aと直交する方向に平行線状に設けられると共に、前記絶縁層18は、表示領域Sにて各々所定幅Wをあけてマトリクス状に形成された複数の第一の開口部18aと、前記第一電極17が形成されていない領域にて前記第一の開口部18aから前記所定幅Wをあけて形成された第二の開口部18bと、前記陰極端子部17bを前記第二電極21に電気的に接続させるための第三の開口部18cと、を有するものである。 In order to solve the above-mentioned problem, the present invention includes a first electrode 17, an insulating layer 18 made of a polyimide-based insulating material , a rib portion 19, an organic layer 20, and a second electrode 21, as described in claim 1. In the organic EL panel 14 in which the laminate 16 having the substrate 16 is formed on the substrate 15, the first electrode 17 includes an anode portion 17 a formed in a stripe shape and a cathode terminal portion 17 b electrically connected to the second electrode 21. The rib portion 19 has a parallel line shape in a direction perpendicular to the anode portion 17a of the first electrode 17 so as to divide the organic layer 20 and the second electrode 21 into a stripe shape. The insulating layer 18 is provided in a plurality of first openings 18 a formed in a matrix with a predetermined width W in the display region S, and in a region where the first electrode 17 is not formed. The first opening Having a second opening 18b formed at a predetermined width W from 18a, and a third opening 18c for electrically connecting to the cathode terminal portion 17b the second electrode 21 It is.

第二の開口部を設けて、各画素における周囲の絶縁層の幅を等しくしたことによって、最外周の画素が、中央部の画素よりも短期間で劣化する虞が少なくなる。   By providing the second opening and making the width of the surrounding insulating layer equal in each pixel, the outermost peripheral pixel is less likely to deteriorate in a shorter period than the central pixel.

以下、本発明の一実施形態を添付の図面に基づいて説明する。図1乃至図5は第一実施形態を示すものである。
有機ELパネル14は、ガラス基板15上に積層体16を形成したものである。積層体16は、第一電極17,絶縁層18,リブ部19,有機層20,第二電極21を有している。
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. 1 to 5 show a first embodiment.
The organic EL panel 14 is obtained by forming a laminated body 16 on a glass substrate 15. The laminate 16 includes a first electrode 17, an insulating layer 18, a rib portion 19, an organic layer 20, and a second electrode 21.

第一電極17は、酸化インジウム(InO)と酸化スズ(SnO)の混合物であるITO(Indium
Tin Oxide)からなるものであり、スパッタリング或いは蒸着等の手段によって、ガラス基板15に形成されている。第一電極17は、一定間隔をあけて配置された縦方向のストライプ状の陽極部17aと、第二電極21に導通される陰極端子部17bとを有している。
The first electrode 17 is made of ITO (Indium), which is a mixture of indium oxide (In 2 O 3 ) and tin oxide (SnO 2 ).
Tin Oxide) and formed on the glass substrate 15 by means of sputtering or vapor deposition. The first electrode 17 has a vertical striped anode portion 17 a arranged at a constant interval, and a cathode terminal portion 17 b that is electrically connected to the second electrode 21.

絶縁層18は、ポリイミド系の絶縁材料からなるものであり、フォトリソグラフィー法等の手段によってパターニングされている。絶縁層18は、マトリクス状に配置された画素Pに対応する開口部18a(第一の開口部)と、表示領域S外に形成されたダミー開口部18b(第二の開口部)と、陰極端子部17bと第二電極21を電気的に接続させるコンタクトホール18c(第三の開口部)とを有している。   The insulating layer 18 is made of a polyimide-based insulating material and is patterned by means such as a photolithography method. The insulating layer 18 includes an opening 18a (first opening) corresponding to the pixels P arranged in a matrix, a dummy opening 18b (second opening) formed outside the display region S, a cathode A contact hole 18c (third opening) for electrically connecting the terminal portion 17b and the second electrode 21 is provided.

リブ部19は、フェノール系の絶縁材料からなるものであり、フォトリソグラフィー法等の手段によって形成されている。リブ部19は、絶縁層18上に形成されており、逆テーパ形状になっている。リブ部19は、陽極部17aと直交する方向に平行線状に設けられており、このリブ部19によって有機層20及び第二電極21をストライプ状に分断されている。   The rib portion 19 is made of a phenol-based insulating material, and is formed by means such as a photolithography method. The rib portion 19 is formed on the insulating layer 18 and has an inversely tapered shape. The rib portion 19 is provided in parallel lines in a direction orthogonal to the anode portion 17a, and the organic layer 20 and the second electrode 21 are divided into stripes by the rib portion 19.

有機層20は、正孔注入層20a,正孔輸送層20b,発光層20c及び電子輸送層20dからなるものであり、白色発光するものである(図4参照)。なお、有機層20は、少なくとも発光層20cがあれば良いが、本実施形態のように正孔注入層20a,正孔輸送層20b及び電子輸送層20dを設けることにより、発光輝度を向上させることができる。第二電極21は、アルミニウム(Al)からなるものであり、リブ部19によって、第一電極17の陽極部17aに直交する方向のストライプ状に分断されている。   The organic layer 20 includes a hole injection layer 20a, a hole transport layer 20b, a light emitting layer 20c, and an electron transport layer 20d, and emits white light (see FIG. 4). The organic layer 20 only needs to have at least the light emitting layer 20c, but the emission luminance can be improved by providing the hole injection layer 20a, the hole transport layer 20b, and the electron transport layer 20d as in this embodiment. Can do. The second electrode 21 is made of aluminum (Al), and is divided by the rib portion 19 into stripes in a direction perpendicular to the anode portion 17 a of the first electrode 17.

次に、図5に基づいて、絶縁層18について更に詳述する。絶縁層18の開口部18aは、表示領域S内において、各々所定幅Wをあけて形成されている。つまり、隣設する開口部18aと開口部18aとの間隔は、所定幅Wとなっている。絶縁層18のダミー開口部18bは、隣設された開口部18aから前記所定幅Wをあけて、表示領域S外に形成されている。ダミー開口部18bは、表示領域Sの左右に設けられており、ダミー開口部18bにおいては、第一電極17は形成されておらず、第二電極21がガラス基板15に当接している。   Next, the insulating layer 18 will be described in more detail with reference to FIG. The openings 18 a of the insulating layer 18 are formed with a predetermined width W in the display area S. That is, the interval between the adjacent opening 18a and the opening 18a is a predetermined width W. The dummy opening 18b of the insulating layer 18 is formed outside the display region S with the predetermined width W from the adjacent opening 18a. The dummy openings 18b are provided on the left and right sides of the display area S. In the dummy openings 18b, the first electrode 17 is not formed, and the second electrode 21 is in contact with the glass substrate 15.

本実施形態の如く、ダミー開口部18bを設けたことにより、各画素Pにおける左右の絶縁層18の幅が等しくなり、最外周の画素Pが、中央部の画素Pよりも短期間で劣化する虞が少ない。   As in the present embodiment, by providing the dummy openings 18b, the widths of the left and right insulating layers 18 in each pixel P become equal, and the outermost peripheral pixel P deteriorates in a shorter period than the central pixel P. There is little fear.

本発明の第一実施形態を示す正面図。The front view which shows 1st embodiment of this invention. 同上実施形態を示す断面図。Sectional drawing which shows embodiment same as the above. 同上実施形態を示す断面図。Sectional drawing which shows embodiment same as the above. 同上実施形態を示す有機層の拡大正面図。The enlarged front view of the organic layer which shows embodiment same as the above. 同上実施形態を示す正面図。The front view which shows embodiment same as the above. 従来例を示す正面図。The front view which shows a prior art example. 同上従来例を示す断面図。Sectional drawing which shows a prior art example same as the above. 同上従来例を示す正面図。The front view which shows a prior art example same as the above.

14 有機ELパネル
15 基板
16 積層体
17 第一電極
17a 陽極部
17b 陰極端子部
18 絶縁層
18a 開口部(第一の開口部)
18b ダミー開口部(第二の開口部)
18c コンタクトホール(第三の開口部)
20 有機層
21 第二電極
S 表示領域
W 所定幅
14 Organic EL Panel 15 Substrate 16 Laminate 17 First Electrode 17a Anode Part 17b Cathode Terminal Part 18 Insulating Layer 18a Opening (First Opening)
18b Dummy opening (second opening)
18c Contact hole (third opening)
20 Organic layer 21 Second electrode S Display area W Predetermined width

Claims (1)

第一電極とポリイミド系の絶縁材料からなる絶縁層とリブ部と有機層と第二電極とを有する積層体を基板に形成した有機ELパネルにおいて、
前記第一電極は、ストライプ状に形成された陽極部と、前記第二電極に電気的に接続される陰極端子部と、を有し、
前記リブ部は、前記有機層及び前記第二電極をストライプ状に分断するように、前記第一電極の前記陽極部と直交する方向に平行線状に設けられると共に、
前記絶縁層は、表示領域にて各々所定幅を開けてマトリクス状に形成された複数の第一の開口部と、前記第一電極が形成されていない領域にて前記第一の開口部から前記所定幅を開けて形成された第二の開口部と、前記陰極端子部を前記第二電極に電気的に接続させるための第三の開口部と、を有することを特徴とする有機ELパネル。
In an organic EL panel in which a laminate including an insulating layer made of a first electrode, a polyimide-based insulating material , a rib portion, an organic layer, and a second electrode is formed on a substrate,
The first electrode has an anode part formed in a stripe shape, and a cathode terminal part electrically connected to the second electrode,
The rib portion is provided in parallel lines in a direction perpendicular to the anode portion of the first electrode so as to divide the organic layer and the second electrode into a stripe shape,
The insulating layer includes a plurality of first openings formed in a matrix with a predetermined width in the display region, and the first opening in the region where the first electrode is not formed. An organic EL panel comprising: a second opening formed with a predetermined width; and a third opening for electrically connecting the cathode terminal to the second electrode .
JP2006010778A 2006-01-19 2006-01-19 Organic EL panel Expired - Fee Related JP4789063B2 (en)

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