JP5271993B2 - 表示装置の製造方法 - Google Patents
表示装置の製造方法 Download PDFInfo
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- JP5271993B2 JP5271993B2 JP2010256459A JP2010256459A JP5271993B2 JP 5271993 B2 JP5271993 B2 JP 5271993B2 JP 2010256459 A JP2010256459 A JP 2010256459A JP 2010256459 A JP2010256459 A JP 2010256459A JP 5271993 B2 JP5271993 B2 JP 5271993B2
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- 229910052725 zinc Inorganic materials 0.000 description 1
- OYQCBJZGELKKPM-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O-2].[Zn+2].[O-2].[In+3] OYQCBJZGELKKPM-UHFFFAOYSA-N 0.000 description 1
- QEPMORHSGFRDLW-UHFFFAOYSA-L zinc;2-(2-hydroxyphenyl)-3h-1,3-benzoxazole-2-carboxylate Chemical compound [Zn+2].OC1=CC=CC=C1C1(C([O-])=O)OC2=CC=CC=C2N1.OC1=CC=CC=C1C1(C([O-])=O)OC2=CC=CC=C2N1 QEPMORHSGFRDLW-UHFFFAOYSA-L 0.000 description 1
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Description
つまり、発光特性のいい材料、キャリア輸送性が優れる材料などを、各々組み合わせることで、容易に高発光効率が達成できるということである。
すなわち、分子設計(例えば置換基の導入)等により様々な発光色の材料を開発できるという柔軟性が、色彩の豊かさを生んでいるのである。
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表示装置に含むものとする。
またそれにより、駆動電圧が低く、信頼性・耐熱性にも優れ、短絡などの欠陥が少ない表示装置を提供することができる。
の第1電極102aを形成し、画素部110aを形成するために、画素部110aを囲む形で絶縁体隔壁103aを設け、有機導電体膜104a(図示せず)を形成したものである。
また図1(b)は、基板上にアイランド状の第1電極102bを形成し、画素部110bを形成するために、画素部110bを囲む形で絶縁体隔壁103bを設け、有機導電体膜104b(図示せず)を形成したものである。いずれの場合も、図中A−A'における断面図は図1(c)のようになる。101は基板、102は第1電極、103は絶縁体隔壁、104は有機導電体膜である。
このような場合、図14(a)に示したとおり、絶縁体隔壁の端部は弧を描く形となるため、T2>T1>T3の状態を容易に形成することができる。特にT3は、絶縁体隔壁の上端に近づくにつれ薄くなっていくため、クロストーク防止に大きな効果をもたらす。
本実施例では、接着剤として紫外線硬化型のものを用いる。また、必要ならば、OLEDを水から防ぐ乾燥剤(図示しない)を、封止ガラス基板準備室415aにおけるガラス導入時ではなく、ディスペンサ室416内で仕込んでもよい。例えば、シート状の乾燥剤を、あらかじめザグリ加工が施してある対向ガラスのザグリ部分に両面テープ等で貼りつけることができる。こうすれば、乾燥剤を大気中で取り扱う必要がなくなる。これらの作業に関しては、完全に自動化してもよいし、グローブを設置して一部手動で行ってもよい。特に封止プラスチック基板が曲率及び弾性を有する場合は、曲がった状態で接着剤を塗布してもよいし、真っ直ぐ伸ばした状態で塗布してもよい。
ただし、有機化合物膜から発した光が偏光板により反射されて内部に戻ることを防ぐため、屈折率を調節して内部反射の少ない構造とすることが好ましい。
本実施例では、画素電極602の材料として仕事関数が4.5〜5.5eVの導電性材料を用いるため、画素電極602は有機発光素子の陽極として機能する。画素電極602として代表的には、酸化インジウム、酸化錫、酸化亜鉛もしくはこれらの化合物(ITOなど)のような、光透過性の材料を用いればよい。画素電極602の上には導電性ポリマー膜604、有機薄膜605が設けられている。
ただし、有機化合物膜から発した光が偏光板により反射されて内部に戻ることを防ぐため、屈折率を調節して内部反射の少ない構造とすることが好ましい。
ラッチ1にはデジタル信号が入力され、ラッチ2に入力されるラッチパルスによって画像データを画素部に送り込むことができる。
即ち、隔壁の間に導電性ポリマー104を形成することができ、隔壁103上には必ずしも形成されず分離させることができる。この導電性ポリマー層上には低分子有機化合物材料で形成される発光層、電子注入輸送層などを形成すれば良い。
また、第1の電極は、これらの材料を用いた膜またはそれらの積層膜を総膜厚100nm〜800nmの範囲で用いればよい。また、カバレッジを良好なものとするため、隔壁の上端部または下端部に曲率を有する曲面が形成されるようにする。例えば、隔壁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1114の上端部のみに曲率半径(0.2μm〜3μm)を有する曲面を持たせることが好ましい。また、隔壁として、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。
陰極としては、仕事関数の小さい材料(Al、Ag、Li、Ca、またはこれらの合金MgAg、MgIn、AlLi、CaF2、またはCa3N2)を用いればよい。ここでは、発光が透過するように、第2の電極(陰極)1616として、膜厚を薄くした金属薄膜と、透明導電膜(ITO(酸化インジウム酸化スズ合金)、酸化インジウム酸化亜鉛合金(In2O3―ZnO)、酸化亜鉛(ZnO)等)との積層を用いる。こうして、第1の電極(陽極)1613、有機導電体膜1630、有機薄膜1615、及び第2の電極(陰極)1616からなる有機発光素子1618が形成される。ここでは有機発光素子1618は白色発光とする例とするので、着色層1631と遮光層(BM)1632からなるカラーフィルター(簡略化のため、ここではオーバーコート層は図示しない)を設けることにより、フルカラー化が可能となる。
なお、第1シール材1605、第2シール材1607としてはエポキシ系樹脂を用いるのが好ましい。また、第1シール材1605、第2シール材1607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。
Claims (4)
- 前記基板上に複数の画素を有する表示装置の製造方法であって、
前記基板上に第1電極を形成する工程と、
前記画素を囲み、前記第1電極の表面より上方に突出した絶縁体隔壁を形成する工程と、
前記絶縁体隔壁及び前記第1電極の全面を覆うように有機導電体を含む水溶液を塗布した後、純水で洗浄する工程と、
前記純水で洗浄する工程の後、前記絶縁体隔壁及び前記第1電極の全面を覆うように前記水溶液を塗布した後、焼成して有機導電体膜を形成する工程と、
前記有機導電体膜上に電界発光できる有機化合物を含む有機薄膜を形成する工程と、
前記有機薄膜上に第2電極を形成する工程を特徴とする表示装置の製造方法。 - 前記基板上に複数の画素を有する表示装置の製造方法であって、
前記基板上に第1電極を形成する工程と、
前記画素を囲み、前記第1電極の表面より上方に突出した絶縁体隔壁を形成する工程と、
前記絶縁体隔壁及び前記第1電極の全面を覆うように有機導電体を含む水溶液を塗布した後、純水で洗浄する工程と、
前記純水で洗浄する工程の後、前記絶縁体隔壁及び前記第1電極の全面を覆うように前記水溶液を塗布した後、焼成して有機導電体膜を形成する工程と、
前記有機導電体膜上に電界発光できる有機化合物を含む有機薄膜を形成する工程と、
前記有機薄膜上に第2電極を形成する工程と、を含み、
前記第1電極上における前記有機導電体膜の膜厚T1と、
前記第1電極と前記絶縁体隔壁との境界上における前記有機導電体膜の膜厚T2と、
前記絶縁体隔壁上における前記有機導電体膜の膜厚T3と、の関係が、T2>T1>T3の状態を形成することを特徴とする表示装置の製造方法。 - 請求項1または2において、
前記純水で洗浄する工程における前記水溶液を塗布する前に、前記絶縁体隔壁及び前記第1電極の表面をUVオゾン処理またはO2プラズマ処理することを特徴とする表示装置の製造方法。 - 請求項1乃至3のいずれか一において、
前記有機導電体膜を形成する工程の後、前記有機導電体膜をO2アッシングによって選択的に除去する工程を含むことを特徴とする表示装置の製造方法。
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