JPWO2016092883A1 - 表示素子および表示装置ならびに電子機器 - Google Patents
表示素子および表示装置ならびに電子機器 Download PDFInfo
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- JPWO2016092883A1 JPWO2016092883A1 JP2016563538A JP2016563538A JPWO2016092883A1 JP WO2016092883 A1 JPWO2016092883 A1 JP WO2016092883A1 JP 2016563538 A JP2016563538 A JP 2016563538A JP 2016563538 A JP2016563538 A JP 2016563538A JP WO2016092883 A1 JPWO2016092883 A1 JP WO2016092883A1
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- light emitting
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- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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Abstract
Description
1.実施の形態
(陰極側にアクセプタ層、ドナー層、発光層および混合層からなる第2発光ユニットを設けた例)
1−1.要部構成
1−2.全体構成
1−3.作用・効果
2.適用例
3.実施例
図1は、本開示の一実施の形態に係る表示素子(表示素子10)の断面構成を表したものである。この表示素子10は、例えば、タブレットやスマートフォン等の携帯端末装置の表示素子として用いられるものである。表示素子10は、駆動基板11上に陽極12、第1発光ユニット13、第2発光ユニット14および陰極15がこの順に積層された、いわゆるタンデム構造を有するものである。表示素子10は、陽極12側から注入された正孔と、陰極15側から注入された電子とが、第1発光ユニット13および第2発光ユニット14に設けられた発光層13Cおよび発光層14C内で、それぞれ再結合する際に生じた発光光を駆動基板11とは反対側(対向基板21側、図4参照)から取り出す上面発光方式(いわゆる、トップエミッション方式)の有機電界発光素子である。
本実施の形態の表示素子10は、第2発光ユニット14が、陽極12側からアクセプタ層14A、ドナー層14B、発光層14Cおよび混合層14Dがこの順に積層された4層構造を有する。
図2は、本実施の形態の表示素子10を備えた表示装置1の全体構成を表すものである。この表示装置1は、タブレットやスマートフォン等の携帯端末装置等として用いられるものであり、例えば、駆動基板11の上に、表示領域110として、複数の表示素子10がマトリクス状に配置されたものである。表示領域110の周辺には、映像表示用のドライバである信号線駆動回路120および走査線駆動回路130が設けられている。なお、隣り合う表示素子10(副画素5R,5G,5B)の組み合わせが一つの画素(ピクセル)を構成している。
,4−ジ−p−トリルアミノスチルベン、ポリ(パラフェニレンビニレン)、ポリ(チオフェンビニレン)、ポリ(2、2'−チエニルピロール)等が挙げられる。
以下、上記実施の形態で説明した表示素子10を備えた表示装置1の適用例について説明する。上記実施の形態の表示装置は、テレビジョン装置,デジタルカメラ,ノート型パーソナルコンピュータ、携帯電話等の携帯端末装置あるいはビデオカメラ等、外部から入力された映像信号あるいは内部で生成した映像信号を、画像あるいは映像として表示するあらゆる分野の電子機器の表示装置に適用することが可能である。特に、モバイル向けの中小型ディスプレイに好適である。以下にその一例を示す。
上記実施の形態の表示素子10を備えた表示装置1は、例えば、図5に示したようなモジュールとして、後述する適用例1,2等の種々の電子機器に組み込まれる。このモジュールは、例えば、駆動基板11の一辺に、保護膜16および対向基板21から露出した領域210を設け、この露出した領域210に、信号線駆動回路120および走査線駆動回路130の配線を延長して外部接続端子(図示せず)を形成したものである。外部接続端子には、信号の入出力のためのフレキシブルプリント配線基板(FPC;Flexible Printed Circuit)220が設けられていてもよい。
図13Aおよび図13Bは、適用例1に係るスマートフォン320の外観を表したものである。このスマートフォン320は、例えば、表側に表示部321および操作部322を有し、裏側にカメラ323を有しており、表示部321に上記実施の形態の表示装置1が搭載されている。
図14Aおよび図14Bは、適用例2に係るタブレットパーソナルコンピュータの外観を表したものである。このタブレットパーソナルコンピュータは、例えば、表示部410および操作部430が配置された筐体(非表示部)420を有しており、表示部410に上記実施の形態の表示装置1が搭載されている。
(実施例1)
次に、本発明の実施例について説明する。サンプル(実施例1〜5および比較例1〜4)として、精細度(解像度)が640×480ピクセルのVGA表示パネルおよび1920×1080ピクセルのFHD表示パネルを作製した。各表示パネルの構成は以下の通りである。
(1)対向配置された陽極および陰極と、前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを備え、前記第2発光ユニットは、前記第1発光ユニット側から順に、アクセプタ層と、芳香族第3級アミンを少なくとも1種含むドナー層と、前記第2発光層と、アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を少なくとも1種含む混合層とが積層された4層構造からなる表示素子。
(2)前記第1発光層および前記第2発光層の発光色は互いに異なる、前記(1)に記載の表示素子。
(3)前記第第2発光層はりん光発光材料を含む、前記(1)または(2)に記載の表示素子。
(4)前記第2発光層は、正孔輸送性ホスト材料および電子輸送性ホスト材料を含む、前記(1)乃至(3)のいずれか1つに記載の表示素子。
(5)前記第2発光層の膜厚は、30nm以下である、前記(1)乃至(4)のいずれか1つに記載の表示素子。
(6)前記アクセプタ層はヘキサアザトリフェニレン誘導体、シアノベンゾキノンジメタンのフッ素化誘導体およびラジアレン類のうちの少なくとも1種類を含む、前記(1)乃至(5)のいずれか1つに記載の表示素子。
(7)表示素子を複数備え、前記表示素子は、対向配置された陽極および陰極と、前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを有し、前記第2発光ユニットは、前記第1発光ユニット側から順に、アクセプタ層と、芳香族第3級アミンを含むドナー層と、前記第2発光層と、アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を含む混合層とが積層された4層構造からなる表示装置。
(8)画面解像度が150ppi以上である、前記(7)に記載の表示装置。
(9)表示部に表示素子を複数有する表示装置を備え、前記表示素子は、対向配置された陽極および陰極と、前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを有し、前記第2発光ユニットは、前記第1発光ユニット側から順に、アクセプタ層と、芳香族第3級アミンを少なくとも1種含むドナー層と、前記第2発光層と、アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を少なくとも1種含む混合層とが積層された4層構造からなる電子機器。
Claims (9)
- 対向配置された陽極および陰極と、
前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、
前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを備え、
前記第2発光ユニットは、前記第1発光ユニット側から順に、
アクセプタ層と、
芳香族第3級アミンを少なくとも1種含むドナー層と、
前記第2発光層と
アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を少なくとも1種含む混合層とが積層された4層構造からなる
表示素子。 - 前記第1発光層および前記第2発光層の発光色は互いに異なる、請求項1に記載の表示素子。
- 前記第第2発光層はりん光発光材料を含む、請求項1に記載の表示素子。
- 前記第2発光層は、正孔輸送性ホスト材料および電子輸送性ホスト材料を含む、請求項1に記載の表示素子。
- 前記第2発光層の膜厚は、30nm以下である、請求項1に記載の表示素子。
- 前記アクセプタ層はヘキサアザトリフェニレン誘導体、シアノベンゾキノンジメタンのフッ素化誘導体およびラジアレン類のうちの少なくとも1種類を含む、請求項1に記載の表示素子。
- 表示素子を複数備え、
前記表示素子は、
対向配置された陽極および陰極と、
前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、
前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを有し、
前記第2発光ユニットは、前記第1発光ユニット側から順に、
アクセプタ層と、
芳香族第3級アミンを含むドナー層と、
前記第2発光層と
アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を含む混合層とが積層された4層構造からなる
表示装置。 - 画面解像度が150ppi以上である、請求項7に記載の表示装置。
- 表示部に表示素子を複数有する表示装置を備え、
前記表示素子は、
対向配置された陽極および陰極と、
前記陽極側に設けられると共に、少なくとも第1発光層を含む第1発光ユニットと、
前記陰極側に設けられると共に、少なくとも第2発光層を含む第2発光ユニットとを有し、
前記第2発光ユニットは、前記第1発光ユニット側から順に、
アクセプタ層と、
芳香族第3級アミンを少なくとも1種含むドナー層と、
前記第2発光層と
アルカリ金属およびアルカリ土類金属のうちの少なくとも1種および複素環化合物を少なくとも1種含む混合層とが積層された4層構造からなる
電子機器。
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