JP2006012434A - Organic el panel - Google Patents

Organic el panel Download PDF

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JP2006012434A
JP2006012434A JP2004183456A JP2004183456A JP2006012434A JP 2006012434 A JP2006012434 A JP 2006012434A JP 2004183456 A JP2004183456 A JP 2004183456A JP 2004183456 A JP2004183456 A JP 2004183456A JP 2006012434 A JP2006012434 A JP 2006012434A
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layer
organic
electrode
panel
organic layer
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Yutaka Shimotori
裕 霜鳥
Raiei Cho
来英 張
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Nippon Seiki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic El panel for displaying in a variety of colors and having small possibilities to lower display brightness. <P>SOLUTION: The organic EL panel is formed by depositing a laminated body 13 having a first electrode 17, an organic layer 20 and a second electrode 21 on a substrate 12. The laminated body 13 further includes a colored layer 14 converting the color of light generated from the organic layer 20; a transparent layer 15 transmitting the light generated from the organic layer 20; and a smoothing layer 16 covering the colored layer 14 and the transparent layer 15. The first electrode 17 has a positive electrode part 17b formed in stripes, and the second electrode 21 has a negative electrode part 21a formed in stripes in a direction intersecting with the positive electrode part 17a. Pixels S1, S2 aligned in matrix shape, composed of opposing parts of the positive electrode part 17a and the negative electrode part 21a are provided with one of the colored layer 14 and the transparent layer 15, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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、有機ELパネルを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,アルミニウム(Al)からなる第二電極7を有する(図8参照)。第一電極4は、ITO(Indium Tin Oxide)からなるものである。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。   Conventionally, various organic EL panels have been proposed, and for example, disclosed in Patent Document 1. The organic EL panel 1 is formed by forming a laminated body 3 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 made of aluminum (Al). (See FIG. 8). The first electrode 4 is made of ITO (Indium Tin Oxide). 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.

積層体3は封止ガラス8に覆われており、この封止ガラス8はガラス基板2に紫外線硬化性の接着剤9で固着されている。第一電極4は、陽極部4aと、陰極端子部4bとを有している。有機層6は、陽極部4aと第二電極7に挟持されており、第二電極7は、陰極端子部4bに電気的に接続されている。陽極部4a及び陰極端子部4bに電源を接続し、陽極部4aと第二電極7の間に駆動電圧を印加することにより、有機層6が発光する。   The laminate 3 is covered with a sealing glass 8, and the sealing glass 8 is fixed to the glass substrate 2 with an ultraviolet curable adhesive 9. The first electrode 4 has an anode part 4a and a cathode terminal part 4b. The organic layer 6 is sandwiched between the anode part 4a and the second electrode 7, and the second electrode 7 is electrically connected to the cathode terminal part 4b. By connecting a power source to the anode part 4a and the cathode terminal part 4b and applying a driving voltage between the anode part 4a and the second electrode 7, the organic layer 6 emits light.

また、有機層6が発した光を着色させるカラーフィルタを用いた有機ELパネルが提案されており、例えば特許文献2に開示されている。斯かる有機ELパネルは、R(赤),G(緑),B(青)の3色のカラーフィルタを有するものであって、有機層6が発した白色光がカラーフィルタを透過することによって色変換され、カラー表示が可能になるものである。
特開2003−288984号公報 特開2003−217852号公報
An organic EL panel using a color filter that colors light emitted from the organic layer 6 has been proposed, and is disclosed in, for example, Patent Document 2. Such an organic EL panel has three color filters of R (red), G (green), and B (blue), and white light emitted from the organic layer 6 is transmitted through the color filter. The color is converted to enable color display.
JP 2003-288984 A JP 2003-217852 A

しかしながら、カラーフィルタは所定の透過率(例えば50%)を有しており、有機層6が発した光をカラーフィルタによって他の色に変換すると、カラーフィルタを用いない場合と比較して、有機ELパネル1の表示輝度が低くなるという問題を有していた。この問題を解決するため、駆動電圧を上げることによって、有機層6の発光輝度を上げることが考えられるが、駆動電圧を上げると有機ELパネル1の寿命が短くなるので、駆動電圧を高くすることは好ましくない。
本発明は、この問題に鑑みなされたものであり、種々の色での表示が可能であり、且つ、表示輝度が低くなる虞が少ない有機ELパネルを提供するものである。
However, the color filter has a predetermined transmittance (for example, 50%), and when the light emitted from the organic layer 6 is converted into another color by the color filter, it is organic compared with the case where the color filter is not used. There has been a problem that the display brightness of the EL panel 1 is lowered. In order to solve this problem, it is conceivable to increase the light emission luminance of the organic layer 6 by increasing the driving voltage. However, if the driving voltage is increased, the life of the organic EL panel 1 is shortened. Is not preferred.
The present invention has been made in view of this problem, and provides an organic EL panel which can be displayed in various colors and has a low risk of lowering display luminance.

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、少なくとも第一電極17と有機層20と第二電極21とを有する積層体13を基板12に形成した有機ELパネル11において、前記積層体13は、前記有機層20が発した光の色を変換させる有色層14と、前記有機層20が発した光を透過させる透明層15と、前記有色層14及び前記透明層15を覆う平滑化層16と、を更に有し、前記第一電極17は前記平滑化層16に形成されてなるものである。   In order to solve the above-mentioned problem, the present invention provides an organic EL panel 11 in which a laminate 13 having at least a first electrode 17, an organic layer 20, and a second electrode 21 is formed on a substrate 12, as described in claim 1. The laminated body 13 includes a colored layer 14 that converts a color of light emitted from the organic layer 20, a transparent layer 15 that transmits light emitted from the organic layer 20, and the colored layer 14 and the transparent layer. And the first electrode 17 is formed on the smoothing layer 16.

また、本発明は、請求項2に記載したように、前記第一電極17はストライプ状に形成された陽極部17aを有し、前記第二電極21は前記陽極部17aに交差する方向のストライプ状に形成された陰極部21aを有するものである。   Further, according to the present invention, as described in claim 2, the first electrode 17 has an anode portion 17a formed in a stripe shape, and the second electrode 21 is a stripe in a direction intersecting the anode portion 17a. It has the cathode part 21a formed in the shape.

また、本発明は、請求項3に記載したように、前記陽極部17aと前記陰極部21aの対向箇所からなりマトリクス状に設けられた画素S1,S2,S3,S4に、前記有色層14及び前記透明層15の一方が夫々設けられてなるものである。   Further, according to the present invention, as described in claim 3, the colored layers 14 and the pixels S1, S2, S3, and S4, which are formed in a matrix from the opposing portions of the anode portion 17a and the cathode portion 21a, are provided. One of the transparent layers 15 is provided.

また、本発明は、請求項4に記載したように、前記有機層20が発する光は白色であるものである。   According to the present invention, the light emitted from the organic layer 20 is white.

有機層が発した光は、透明層15での減衰が小さいため、表示輝度が低くなる虞が少なく、且つ、種々の色での表示が可能である。   Since the light emitted from the organic layer has a small attenuation in the transparent layer 15, there is little possibility that the display luminance is lowered, and display in various colors is possible.

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6は第一実施形態を示すものである。
有機ELパネル11は、ガラス基板12上に積層体13を形成したものである。積層体13は、有色層14,透明層15,平滑化層16,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 6 show a first embodiment.
The organic EL panel 11 is obtained by forming a laminated body 13 on a glass substrate 12. The laminate 13 includes a colored layer 14, a transparent layer 15, a smoothing layer 16, a first electrode 17, an insulating layer 18, a rib portion 19, an organic layer 20, and a second electrode 21.

有色層14は、アンバー色のカラーフィルタからなるものであり、ガラス基板12に形成されている。透明層15は、略無色のフィルタからなるものであり、ガラス基板12に形成されている。透明層15の透過率は、波長が470nm付近で70%以上、且つ、500nm付近で70%以上であることが望ましい。有色層14及び透明層15は、正面視で矩形状になっており、有色層14と透明層15とが所定間隔を開けて横方向で交互に配置されている。平滑化層16は、アクリル系材料からなるものであり、有色層14及び透明層15を覆うようにガラス基板12に形成されている。   The colored layer 14 is made of an amber color filter and is formed on the glass substrate 12. The transparent layer 15 is made of a substantially colorless filter and is formed on the glass substrate 12. The transmittance of the transparent layer 15 is desirably 70% or more near a wavelength of 470 nm and 70% or more near 500 nm. The colored layer 14 and the transparent layer 15 have a rectangular shape when viewed from the front, and the colored layer 14 and the transparent layer 15 are alternately arranged in the lateral direction at a predetermined interval. The smoothing layer 16 is made of an acrylic material, and is formed on the glass substrate 12 so as to cover the colored layer 14 and the transparent layer 15.

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、平滑化層16上に形成されている。第一電極17は、所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の陰極部21a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 smoothing layer 16 by means of sputtering or vapor deposition. The first electrode 17 has a vertical stripe-shaped anode portion 17 a arranged at a predetermined interval and a cathode terminal portion 17 b that is electrically connected to the cathode portion 21 a of 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形成されている。絶縁層18は、有機層20よりも広い領域に形成されており、マトリクス状に配置されたサブピクセルS1,S2(画素)に対応する矩形の開口18aと、陰極端子部17bと陰極部21aを電気的に接続させるコンタクトホール18bとを有している。   The insulating layer 18 is made of a polyimide-based insulating material and is formed by means such as a photolithography method. The insulating layer 18 is formed in a wider area than the organic layer 20, and includes rectangular openings 18a corresponding to the subpixels S1 and S2 (pixels) arranged in a matrix, a cathode terminal portion 17b, and a cathode portion 21a. And a contact hole 18b to be electrically connected.

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、有機層20及び第二電極21をストライプ状に分断する。   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 perpendicular to the anode portion 17a, and divides the organic layer 20 and the second electrode 21 into stripes.

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、陰極部21aが形成されている。   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 17a of the first electrode 17 to form a cathode portion 21a.

有機ELパネル11のピクセルPは、一対のサブピクセルS1,S2から構成されている(図5参照)。サブピクセルS1には有色層14が設けられておりサブピクセルS2には透明層15が設けられている。   The pixel P of the organic EL panel 11 is composed of a pair of subpixels S1 and S2 (see FIG. 5). The subpixel S1 is provided with a colored layer 14, and the subpixel S2 is provided with a transparent layer 15.

本実施形態によれば、サブピクセルS1及びサブピクセルS2を適宜オン/オフさせることにより、種々の色での表示が可能になる。且つ、サブピクセルS2においては、有機層20が発した光は、透明層15での減衰が小さいため、表示輝度が従来よりも高くなる。なお、サブピクセルS1においては、有色層14の透過率に応じて表示輝度が低くなるが、ピクセルPとしては従来よりも表示輝度が向上する。   According to the present embodiment, display in various colors is possible by appropriately turning on / off the subpixel S1 and the subpixel S2. Further, in the subpixel S2, the light emitted from the organic layer 20 is less attenuated in the transparent layer 15, so that the display luminance is higher than in the conventional case. In the subpixel S1, the display luminance is lowered according to the transmittance of the colored layer 14, but the display luminance of the pixel P is improved as compared with the conventional pixel P1.

なお、図7に示す第二実施形態のように、サブピクセルS3の幅をサブピクセルS4の幅よりも小さくすることによって、サブピクセルS3の面積をサブピクセルS4の面積の1/2にして、サブピクセルS3には有色層24を設け、サブピクセルS4には透明層25を設けても良く、第一実施形態と同様な効果を得ることができる。   As in the second embodiment shown in FIG. 7, by making the width of the subpixel S3 smaller than the width of the subpixel S4, the area of the subpixel S3 is reduced to ½ of the area of the subpixel S4. The colored layer 24 may be provided in the subpixel S3, and the transparent layer 25 may be provided in the subpixel S4, and the same effect as in the first embodiment can be obtained.

また、本発明は、第一,第二実施形態に限定されるものではなく、種々の変形が可能であり、例えば、有色層14,24はアンバー色に限定されるものではなく、他の色であっても良い。   Further, the present invention is not limited to the first and second embodiments, and various modifications are possible. For example, the colored layers 14 and 24 are not limited to amber color, and other colors It may be.

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ピクセルの拡大図。The enlarged view of the pixel which shows embodiment same as the above. 同上実施形態を示す要部拡大断面図。The principal part expanded sectional view which shows embodiment same as the above. 本発明の第二実施形態を示すピクセルの拡大図。The enlarged view of the pixel which shows 2nd embodiment of this invention. 従来例を示す断面図。Sectional drawing which shows a prior art example.

符号の説明Explanation of symbols

11 有機ELパネル
12 ガラス基板(基板)
13 積層体
14 有色層
15 透明層
16 平滑化層
17 第一電極
17a 陽極部
17b 陰極端子部
20 有機層
21 第二電極
21a 陰極部
P ピクセル
S1 サブピクセル(画素)
S2 サブピクセル(画素)
11 Organic EL panel 12 Glass substrate (substrate)
DESCRIPTION OF SYMBOLS 13 Laminated body 14 Colored layer 15 Transparent layer 16 Smoothing layer 17 1st electrode 17a Anode part 17b Cathode terminal part 20 Organic layer 21 2nd electrode 21a Cathode part P Pixel S1 Sub pixel (pixel)
S2 Subpixel (pixel)

Claims (4)

少なくとも第一電極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、
前記積層体は、前記有機層が発した光の色を変換させる有色層と、前記有機層が発した光を透過させる透明層と、前記有色層及び前記透明層を覆う平滑化層と、を更に有し、前記第一電極は前記平滑化層に形成されてなることを特徴とする有機ELパネル。
In an organic EL panel in which a laminate having at least a first electrode, an organic layer, and a second electrode is formed on a substrate,
The laminate includes a colored layer that converts a color of light emitted from the organic layer, a transparent layer that transmits light emitted from the organic layer, and a smoothing layer that covers the colored layer and the transparent layer. And an organic EL panel, wherein the first electrode is formed on the smoothing layer.
前記第一電極はストライプ状に形成された陽極部を有し、前記第二電極は前記陽極部に交差する方向のストライプ状に形成された陰極部を有することを特徴とする請求項1に記載の有機ELパネル。   The said 1st electrode has an anode part formed in stripe form, and said 2nd electrode has a cathode part formed in stripe form of the direction which cross | intersects the said anode part. Organic EL panel. 前記陽極部と前記陰極部の対向箇所からなりマトリクス状に設けられた画素に、前記有色層及び前記透明層の一方が夫々設けら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。   3. The organic EL panel according to claim 2, wherein one of the colored layer and the transparent layer is provided in each of the pixels provided in a matrix formed by facing portions of the anode portion and the cathode portion. . 前記有機層が発する光は白色であることを特徴とする請求項1に記載の有機ELパネル。   The organic EL panel according to claim 1, wherein the light emitted from the organic layer is white.
JP2004183456A 2004-06-22 2004-06-22 Organic el panel Abandoned JP2006012434A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011228249A (en) * 2010-03-29 2011-11-10 Tdk Corp Transmissive color organic el display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588011A (en) * 1991-05-27 1993-04-09 Canon Inc Production of color filter
JP2001057290A (en) * 1999-08-20 2001-02-27 Tdk Corp El display unit
JP2003229266A (en) * 2002-01-31 2003-08-15 Toyota Industries Corp Organic el color display device and manufacturing method of the same
JP2004311440A (en) * 2003-04-07 2004-11-04 Samsung Electronics Co Ltd Organic electroluminescent display device
JP2004335467A (en) * 2003-04-30 2004-11-25 Eastman Kodak Co Color oled display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588011A (en) * 1991-05-27 1993-04-09 Canon Inc Production of color filter
JP2001057290A (en) * 1999-08-20 2001-02-27 Tdk Corp El display unit
JP2003229266A (en) * 2002-01-31 2003-08-15 Toyota Industries Corp Organic el color display device and manufacturing method of the same
JP2004311440A (en) * 2003-04-07 2004-11-04 Samsung Electronics Co Ltd Organic electroluminescent display device
JP2004335467A (en) * 2003-04-30 2004-11-25 Eastman Kodak Co Color oled display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011228249A (en) * 2010-03-29 2011-11-10 Tdk Corp Transmissive color organic el display device

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