JP2011096668A - 発光装置及び光源装置 - Google Patents
発光装置及び光源装置 Download PDFInfo
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- JP2011096668A JP2011096668A JP2010278874A JP2010278874A JP2011096668A JP 2011096668 A JP2011096668 A JP 2011096668A JP 2010278874 A JP2010278874 A JP 2010278874A JP 2010278874 A JP2010278874 A JP 2010278874A JP 2011096668 A JP2011096668 A JP 2011096668A
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Abstract
【解決手段】 本発明は、半導体基板にlang=EN-US>FETを形成し、絶縁物19の上端部に曲率半径を有する曲面を形成し、該曲面に合わせて第1の電極18c、18dの一部が露呈して斜面が形成され、発光領域となる領域に第1の電極18bが露呈するようにエッチング処理する。有機化合物層20からの発光を第1の電極18c、18dの斜面で反射させて、図1(A)中に示した矢印方向におけるトータルの光の取り出し量を増加させる。
【選択図】 図1
Description
が取り付けられたモジュール、TABテープやTCPの先にプリント配線板が設けられたモジュール、または発光素子にCOG(Chip On Glass)方式によりIC(集積回路)が直接実装されたモジュールも全て半導体装置に含むものとする。
代表的には、線順次駆動方法とし、時分割階調駆動方法や面積階調駆動方法を適宜用いればよい。また、発光装置のソース線に入力する映像信号は、アナログ信号であってもよいし、デジタル信号であってもよく、適宜、映像信号に合わせて駆動回路などを設計すればよい。
アクティブマトリクス型発光装置の断面図(1画素の一部)を図1(A)に示す。ここでは、白色発光する高分子材料からなる有機化合物を含む層を発光層に用いた発光素子を一例として説明する。
基板、(110)基板、(111)基板など)、または高純度半導体基板を用いることができる。また、例えば、直径200mm〜300mmのウエハ(円形)
を切断して四角形基板に加工した後にFETを形成する。或いは、FETおよび発光素子を形成した後、所望のサイズに分断する多面取りを行ってもよい。また、半導体基板10としてGaAs基板、InP基板、GaN系エピ用のGaN基板、SiC基板、サファイヤ基板、ZnSeなどで代表される化合物半導体基板を用いてもよい。また、ウエハ貼り付け法やSIMOX(separation by implanted oxygen)法によりSOI(Si on Insulator)基板構造を形成してもよい。
であり、21は、導電膜からなる第2の電極、即ち、OLEDの陰極(或いは陽極)である。ここでは、18aとしてチタン膜、18bとして窒化チタン膜、18cとしてアルミニウムを主成分とする膜、18dとして窒化チタン膜として順に積層し、有機化合物を含む層20に接する18bを陽極として機能させる。また、同じ積層構造で電源供給線17も形成される。上記積層構造は、アルミニウムを主成分とする膜を含んでおり、低抵抗な配線とすることができ、ソース配線22なども同時に形成される。
水溶液(PEDOT/PSS)を全面に塗布、焼成した後、発光層として作用する発光中心色素(1,1,4,4−テトラフェニル−1,3−ブタジエン(TPB)、4−ジシアノメチレン−2−メチル−6−(p−ジメチルアミノ−スチリル)−4H−ピラン(DCM1)、ナイルレッド、クマリン6など)ドープしたポリビニルカルバゾール(PVK)溶液を全面に塗布、焼成する。なお、PEDOT/PSSは溶媒に水を用いており、有機溶剤には溶けない。従って、PVKをその上から塗布する場合にも、再溶解する心配はない。また、PEDOT/PSSとPVKは溶媒が異なるため、成膜室は同一のものを使用しないことが好ましい。また、有機化合物を含む層20を単層とすることもでき、ホール輸送性のポリビニルカルバゾール(PVK)に電子輸送性の1,3,4−オキサジアゾール誘導体(PBD)を分散させてもよい。また、30wt%のPBDを電子輸送剤として分散し、4種類の色素(TPB、クマリン6、DCM1、ナイルレッド)を適当量分散することで白色発光が得られる。
以下に、白色発光素子とカラーフィルターを組み合わせた方法(以下、カラーフィルター法とよぶ)について図5(A)により説明する。
、緑色発光以外を吸収する着色層(G)、青色発光以外を吸収する着色層(B)
をそれぞれ設けたカラーフィルタを形成することにより、発光素子からの白色発光をそれぞれ分離して、赤色発光、緑色発光、青色発光として得ることができる。また、アクティブマトリクス型の場合には、基板とカラーフィルターの間にTFTが形成される構造となる。
ここでは、半導体基板上に下地絶縁膜を形成し、その上にFETの一種であるTFTを形成した例を図4に示す。
基板、(110)基板、(111)基板など)、または高純度半導体基板を用いることができる。また、例えば、直径200mm〜300mmのウエハ(円形)
を切断して四角形基板に加工した後にFETを形成する。或いは、FETおよび発光素子を形成した後、所望のサイズに分断する多面取りを行ってもよい。また、半導体基板40としてGaAs基板、InP基板、GaN系エピ用のGaN基板、SiC基板、サファイヤ基板、ZnSeなどで代表される化合物半導体基板を用いてもよい。また、ウエハ貼り付け法やSIMOX(separation by implanted oxygen)法によりSOI(Si on Insulator)基板構造を形成してもよい。
この半導体基板40は、発光素子の発熱を分散させるためのものである。
などを含む)、またはこれらの積層膜を用いて層間絶縁膜35を形成する。
例えば、絶縁物の材料としてポジ型の感光性アクリルを用いた場合、絶縁物の上端部のみに曲率半径を有する曲面を持たせることが好ましい。また、絶縁物として、感光性の光によってエッチャントに不溶解性となるネガ型、或いは光によってエッチャントに溶解性となるポジ型のいずれも使用することができる。
を含有させても良い。
をA−A’で切断した断面図である。点線で示された901はソース信号線駆動回路、902は画素部、903はゲート信号線駆動回路である。また、904は封止基板、905はシール剤であり、シール剤905で囲まれた内側は、空間907になっている。また、930a、930bはICチップであり、半導体基板910にCOG(chip on glass)方法やワイヤボンディング方法、或いはTAB(tape automated bonding)方法により実装されている。
こうして、電子装置の消費電力を低減させることもできる。
そして、シール剤905の内側の空間907には窒素等の不活性気体が充填されている。なお、シール剤905としてはエポキシ系樹脂を用いるのが好ましい。
また、シール剤905はできるだけ水分や酸素を透過しない材料であることが望ましい。さらに、空間907の内部に酸素や水を吸収する効果をもつ物質を含有させても良い。
Claims (15)
- 第1の電極と、
前記第1の電極上に設けられた有機化合物を含む層と、
前記有機化合物を含む層上に設けられた第2の電極と、を有し、
前記第1の電極は、凹部を有し、
前記凹部が有する傾斜面において、前記有機化合物を含む層からの発光を反射させ、
前記第1の電極は、トランジスタのソース領域又はドレイン領域と接続され、
前記トランジスタは、半導体基板を用いて設けられたことを特徴とする発光装置。 - 第1の電極と、
前記第1の電極上に設けられた有機化合物を含む層と、
前記有機化合物を含む層上に設けられた第2の電極と、を有し、
前記第1の電極は、凹部を有し、
前記凹部が有する傾斜面において、前記有機化合物を含む層からの発光を反射させ、
前記第1の電極は、トランジスタのソース領域又はドレイン領域と接続され、
前記トランジスタは、SOI基板を用いて設けられたことを特徴とする発光装置。 - 請求項1又は請求項2において、
前記凹部は、前記第1の電極の端部よりも膜厚の小さい部分を有することを特徴とする発光装置。 - 第1の電極と、
前記第1の電極上に設けられた有機化合物を含む層と、
前記有機化合物を含む層上に設けられた第2の電極と、を有し、
前記第1の電極は、端部と当該端部よりも層の数が少ない部分との段差を有し、
前記段差が有する傾斜面において、前記有機化合物を含む層からの発光を反射させ、
前記第1の電極は、トランジスタのソース領域又はドレイン領域と接続され、
前記トランジスタは、半導体基板を用いて設けられたことを特徴とする発光装置。 - 第1の電極と、
前記第1の電極上に設けられた有機化合物を含む層と、
前記有機化合物を含む層上に設けられた第2の電極と、を有し、
前記第1の電極は、端部と当該端部よりも層の数が少ない部分との段差を有し、
前記段差が有する傾斜面において、前記有機化合物を含む層からの発光を反射させ、
前記第1の電極は、トランジスタのソース領域又はドレイン領域と接続され、
前記トランジスタは、SOI基板を用いて設けられたことを特徴とする発光装置。 - 請求項3乃至請求項5のいずれか一項において、
前記傾斜面は、前記第1の電極の前記端部から中央部に向かって傾斜を有することを特徴とする発光装置。 - 第1の電極と、前記第1の電極上に設けられた有機化合物を含む層と、前記有機化合物を含む層上に設けられた第2の電極と、を有する発光素子と、
前記発光素子を制御する素子と、を有し、
前記第1の電極は、凹部を有し、
前記凹部が有する傾斜面において、前記有機化合物を含む層からの発光を反射させることを特徴とする発光装置。 - 請求項1乃至請求項7のいずれか一項において、
前記有機化合物を含む層は、白色発光することを特徴とする発光装置。 - 請求項8において、
前記白色発光をカラーフィルタに通すことにより、赤色発光、緑色発光、又は、青色発光を得ることを特徴とする発光装置。 - 請求項1乃至請求項7のいずれか一項において、
前記有機化合物を含む層は、赤色発光、緑色発光、又は、青色発光することを特徴とする発光装置。 - 請求項1乃至請求項7のいずれか一項において、
前記有機化合物を含む層は、単色発光し、
前記単色発光を色変換層に照射することにより、前記色変換層で色変換が行われることを特徴とする発光装置。 - 請求項1乃至請求項11のいずれか一項において、
前記傾斜面の傾斜角度は、30°を超え、且つ、70°未満であることを特徴とする発光装置。 - 請求項1乃至請求項12のいずれか一項において、
前記第1の電極は、チタンを含む金属層、窒化タングステンを含む金属層、アルミニウムを含む金属層、又は、窒化チタンを含む金属層を有することを特徴とする発光装置。 - 請求項1乃至請求項13のいずれか一項に記載の発光装置を有することを特徴とする光源装置。
- 請求項14に記載の光源装置は照明装置であることを特徴とする光源装置。
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Also Published As
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CN100380686C (zh) | 2008-04-09 |
US9000429B2 (en) | 2015-04-07 |
US20130119389A1 (en) | 2013-05-16 |
US9165987B2 (en) | 2015-10-20 |
CN1453883A (zh) | 2003-11-05 |
US20150214283A1 (en) | 2015-07-30 |
US7786496B2 (en) | 2010-08-31 |
US20030201447A1 (en) | 2003-10-30 |
JP5106622B2 (ja) | 2012-12-26 |
US7482182B2 (en) | 2009-01-27 |
US20180145275A1 (en) | 2018-05-24 |
US20060267030A1 (en) | 2006-11-30 |
US9362534B2 (en) | 2016-06-07 |
US8785919B2 (en) | 2014-07-22 |
US9831459B2 (en) | 2017-11-28 |
US20160336529A1 (en) | 2016-11-17 |
US20150014664A1 (en) | 2015-01-15 |
US8624235B2 (en) | 2014-01-07 |
US8344363B2 (en) | 2013-01-01 |
US20160093835A1 (en) | 2016-03-31 |
US20140131694A1 (en) | 2014-05-15 |
US10454059B2 (en) | 2019-10-22 |
US20100181592A1 (en) | 2010-07-22 |
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