JP2004355949A - Manufacturing method of organic el display and manufacturing device of organic el display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an organic EL display applying a low cost and simple patterning method in order to demonstrate characteristics of coating. <P>SOLUTION: This is the manufacturing method of an organic EL display having a hole injecting electrode, an electron injecting electrode, and at least one kind of organic layer provided between these organic layers. A patterning is carried out at least at one layer, and the formation of the patterned organic layer is carried out by application with a ballpoint pen. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００４１】
（Ｒは２−エチルヘキシルオキシ基であり、Ｒ’はメトキシ基であり、
ｎは重合度を表し、Ｍｗは５００００である。）
【００４２】
【化２】

【００４３】
（Ｒ_１およびＲ_１’は各々アルキル基であり、
Ａｒは置換基を有していてもよい芳香環基または複素環基であり、
ｎは重合度を表し、Ｍｗは５０００〜３００万である。）
【００４４】
また、発光層は１層であっても２層以上あってもよく、発光層と電荷輸送層で複数層を形成していてもよい。さらに、発光層は、高分子発光材料以外に、下記の発光材料、電荷輸送材料を含有していてもよい。また、前記高分子発光材料および／または電荷輸送材料を高分子化合物に分散させてもよい。
【００４５】
本発明の高分子発光材料と共に使用できる既知の発光材料としては特に限定されないが、例えば、ナフタレン誘導体、アントラセンおよびその誘導体、ペリレンおよびその誘導体、ポリメチン系、キサンテン系、クマリン系、シアニン系などの色素類、８−ヒドロキシキノリンおよびその誘導体の金属錯体、芳香族アミン、テトラフェニルシクロペンタジエンおよびその誘導体、テトラフェニルブタジエンおよびその誘導体などを用いることができる。具体的には、例えば、特開昭５７−５１７８１号、同５９−１９４３９３号公報に記載されているもの等、公知のものが使用可能である。
【００４６】
本発明に使用することのできる電荷輸送材料としては、種々の電子輸送性材料、ホール輸送性材料を用いることができ、特に限定されるものではない。
【００４７】
ホール輸送性材料としては、ピラゾリン誘導体、アリールアミン誘導体、スチルペン誘導体、トリフェニルジアミン誘導体等を挙げることができる。
【００４８】
電子輸送性材料としては、オキサジアゾール誘導体、アントラキノジメタンおよびその誘導体、ベンゾキノンおよびその誘導体、ナフトキノンおよびその誘導体、アントラキノンおよびその誘導体、テトラシアノアンスラキノジメタンおよびその誘導体、フルオレンおよびその誘導体、ジフェニルジシアノエチレンおよびその誘導体、ジフェノキノン誘導体、８−ヒドロキシキノリンおよびその誘導体等の金属錯体等を挙げることができる。
【００４９】
具体的には、特開昭６３−７０２５７号公報、同６３−１７５８６０号公報、特開平２−１３５３５９号公報、同２−１３５３６１号公報、同２−２０９９８８号公報、同３−３７９９２号公報、同３−１５２１８４号公報に記載されているものなどを挙げることができる。
【００５０】
特にホール輸送性材料としては４，４−ビス（Ｎ−（３−メチルフェニル）−Ｎ−フェニルアミノ）ビフェニル、電子輸送性材料としては２−（４−ビフェニリル）−５−（４−ｔ−ブチルフェニル）−１，３，４−オキサジアゾール、ベンゾキノン、アントラキノン、トリス（８−キノリノラト）アルミニウムが好ましい。
【００５１】
これらのうち、電子輸送性の化合物とホール輸送性の化合物のいずれか一方、または両方を同時に使用するとよい。これらの化合物は各々単独で用いてもよいし、混合して用いてもよい。
【００５２】
電荷輸送材料の使用量は、使用する化合物の種類などにより異なるので、十分な成膜性と発光特性を阻害しない範囲で最適な添加量を決めればよい。通常、発光材料に対して１〜４０％（質量百分率）であり、より好ましくは２〜３０％（質量百分率）である。
【００５３】
また、有機層として上記の発光層以外に電子注入輸送層、ホール注入輸送層などを有していてもよい。有機材料からなる電子注入輸送層、ホール注入輸送層に用いられる電子輸送性材料、ホール輸送性材料は上記の材料のなかから、発光層や電極等との関係で好適なものを用いればよい。
【００５４】
上記高分子発光材料を用いた場合の発光層の厚さとしては０．５ｎｍ〜１０μｍ 、好ましくは１ｎｍ〜１μｍ である。電流密度を上げて発光効率を上げるためには、１０〜５００ｎｍの範囲が好ましい。なお、塗布法により薄膜化した場合には、溶媒を除去するため、減圧下あるいは不活性雰囲気下、３０〜２００℃、好ましくは６０〜１００℃の温度で加熱乾燥することが望ましい。
【００５５】
また、電荷注入輸送層を発光層の下層に形成する場合、発光層の形成に加熱重合工程を要するときは、ある程度の耐熱性が必要となる。この場合、好ましくはガラス転移温度が１００℃以上、より好ましくは１５０℃以上、特に２００℃以上の化合物が好ましい。ガラス転移温度の上限に特に制限はないが、３００℃程度である。
【００５６】
有機のホール注入輸送層の厚さおよび電子注入輸送層の厚さは、特に制限されるものではなく、形成方法によっても異なるが、通常５〜５００ｎｍ程度、特に１０〜３００ｎｍとすることが好ましい。ホールの注入層と輸送層とを設ける場合は、注入層は１ｎｍ以上、輸送層は１ｎｍ以上とするのが好ましい。このときの注入層、輸送層の厚さの上限は、通常、注入層で５００ｎｍ程度、輸送層で５００ｎｍ程度である。
【００５７】
本発明の有機層形成に用いられる溶媒ないし分散媒としては、有機材料が溶解ないし分散し、塗布に際して障害が生じないものであれば特に限定されるものではない。具体的には、アルコール系、炭化水素系、ケトン系、エーテル系等一般に用いられているものを使用することができる。なかでも、クロロホルム、塩化メチレン、ジクロロエタン、テトラヒドロフラン、トルエン、キシレンなどが好ましい。また、分散媒としては水なども用いられる。高分子材料の場合、高分子材料の構造や分子量にもよるが、通常はこれらの溶媒ないし分散媒に０．１％（質量百分率）以上溶解ないし分散させることができる。高分子以外の有機材料の場合も同様の含有量としてよい。
【００５８】
陰極（電子注入電極）は、無機電子注入層等の電子注入層とを組み合わせて用いる場合は、低仕事関数で電子注入性を有している必要がないため、その材料として、特に限定される必要はなく、通常の金属を用いることができる。なかでも、導電率や扱い易さの点で、Ａｌ，Ａｇ，Ｉｎ，Ｔｉ，Ｃｕ，Ａｕ，Ｍｏ，Ｗ，Ｐｔ，ＰｄおよびＮｉ、特にＡｌ，Ａｇから選択される１種または２種等の金属元素が好ましい。これら陰極の厚さは、電子を高抵抗の無機電子注入輸送層に与えることのできる一定以上の厚さとすれば良く、５０ｎｍ以上、好ましくは１００ｎｍ以上とすればよい。また、その上限値には特に制限はないが、通常、厚さは５０〜５００ｎｍ程度とすればよい。
【００５９】
また、陰極（電子注入電極）として必要に応じて下記のものを用いてもよい。例えば、Ｋ、Ｃｓ、Ｌｉ、Ｎａ、Ｍｇ、Ｌａ、Ｃｅ、Ｃａ、Ｓｒ、Ｂａ、Ｓｎ、Ｚｎ、Ｚｒ等の金属元素単体、または安定性を向上させるためにそれらを含む２成分、３成分の合金系、例えばＡｇ・Ｍｇ合金（Ａｇ量０．１〜５０％（原子比））、Ａｌ・Ｌｉ合金（Ｌｉ量０．０１〜１４％（原子比））、Ｉｎ・Ｍｇ合金（Ｍｇ：５０〜８０％（原子比））、Ａｌ・Ｃａ合金（Ｃａ量０．０１〜２０％（原子比））等が挙げられる。陰極（電子注入電極）の厚さは、電子注入を十分行える一定以上の厚さとすれば良く、０．１ｎｍ以上、好ましくは０．５ｎｍ以上、特に１ｎｍ以上とすればよい。また、その上限値には特に制限はないが、通常、厚さは１〜５００ｎｍ程度とすればよい。陰極（電子注入電極）の上には、さらに補助電極（保護電極）を設けてもよい。
【００６０】
補助電極の厚さは、電子注入効率を確保し、水分や酸素あるいは有機溶媒の進入を防止するため、一定以上の厚さとすればよく、好ましくは５０ｎｍ以上、さらには１００ｎｍ以上、特に１００〜５００ｎｍの範囲が好ましい。補助電極層が薄すぎると、その効果が得られず、また、補助電極層の段差被覆性が低くなってしまい、端子電極との接続が十分ではなくなる。一方、補助電極層が厚すぎると、補助電極層の応力が大きくなるため、ダークスポットの成長速度が速くなってしまう等といった弊害が生じてくる。補助電極は、組み合わせる電子注入電極の材料により最適な材料を選択して用いればよい。例えば、電子注入効率を確保することを重視するのであればＡｌ等の低抵抗の金属を用いればよく、封止性を重視する場合には、ＴｉＮ等の金属化合物を用いてもよい。
【００６１】
陰極（電子注入電極）と補助電極とを併せた全体の厚さとしては、特に制限はないが、通常５０〜５００ｎｍ程度とすればよい。
【００６２】
陽極（ホール注入電極）の材料は、無機ホール注入輸送層、または有機のホール注入輸送層へホールを効率よく注入することのできるものが好ましく、仕事関数４．５ｅＶ〜５．５ｅＶの物質が好ましい。具体的には、錫ドープ酸化インジウム（ＩＴＯ）、亜鉛ドープ酸化インジウム（ＩＺＯ）、酸化インジウム（Ｉｎ_２Ｏ_３ ）、酸化スズ（ＳｎＯ_２ ）および酸化亜鉛（ＺｎＯ）のいずれかを主組成としたものが好ましい。これらの酸化物はその化学量論組成から多少偏倚していてもよい。Ｉｎ_２Ｏ_３ に対するＳｎＯ_２ の混合比は、１〜２０％（質量百分率）、さらには５〜１２％（質量百分率）が好ましい。また、ＩＺＯでのＩｎ_２Ｏ_３ に対するＺｎＯの混合比は、通常、１２〜３２％（質量百分率）程度である。
【００６３】
陽極（ホール注入電極）は、仕事関数を調整するため、酸化シリコン（ＳｉＯ_２ ）を含有していてもよい。酸化シリコン（ＳｉＯ_２ ）の含有量は、ＩＴＯに対するＳｉＯ_２ の モル比で０．５〜１０％程度が好ましい。ＳｉＯ_２ を含有することにより、ＩＴＯの仕事関数が増大する。
【００６４】
光を取り出す側の電極は、発光波長帯域、通常４００〜７００ｎｍ、特に各発光光に対する光透過率が５０％以上、さらには８０％以上、特に９０％以上であることが好ましい。透過率が低くなりすぎると、発光層からの発光自体が減衰され、発光素子として必要な輝度を得難くなってくる。その場合の電極の厚さは、５０〜５００ｎｍ、特に５０〜３００ｎｍの範囲が好ましい。また、その上限は特に制限はないが、あまり厚いと透過率の低下や剥離などの心配が生じる。厚さが薄すぎると、十分な効果が得られず、製造時の膜強度等の点でも問題がある。このような電極は陽極であることが多い。
【００６５】
さらに、素子の有機層や電極の劣化を防ぐために、素子上を封止板等により封止することが好ましい。封止板は、湿気の浸入を防ぐために、接着性樹脂層を用いて、封止板を接着し密封する。封止ガスは、Ａｒ、Ｈｅ、Ｎ_２ 等の不活性ガス等が好ましい。また、この封止ガスの水分含有量は、１００ｐｐｍ 以下、より好ましくは１０ｐｐｍ 以下、特には１ｐｐｍ 以下であることが好ましい。この水分含有量に下限値は特にないが、通常０．１ｐｐｍ 程度である。
【００６６】
本発明において、有機ＥＬ構造体を形成する基板としては、非晶質基板（例えばガラス、石英など）、結晶基板（例えば、Ｓｉ、ＧａＡｓ、ＺｎＳｅ、ＺｎＳ、ＧａＰ、ＩｎＰなど）が挙げられ、また、これらの結晶基板に結晶質、非晶質あるいは金属のバッファ層を形成した基板も用いることができる。また、金属基板としては、Ｍｏ、Ａｌ、Ｐｔ、Ｉｒ、Ａｕ、Ｐｄなどを用いることができ、好ましくはガラス基板が用いられる。基板は、光取り出し側となる場合、上記電極と同様な光透過性を有することが好ましい。
【００６７】
さらに、本発明では素子を平面上に多数並べてもよい。平面上に並べられたそれぞれの素子の発光色を変えて、カラーのディスプレーにすることができる。
【００６８】
基板に色フィルター膜や蛍光性物質を含む色変換膜、あるいは誘電体反射膜を用いて発光色をコントロールしてもよい。
【００６９】
本発明の有機ＥＬ表示体は、通常、直流駆動型、パルス駆動型のＥＬ表示体として用いられるが、交流駆動とすることもできる。印加電圧は、通常、２〜３０Ｖ 程度とされる。
【００７０】
本発明の有機ＥＬ表示体は、例えば、基板／第１の電極（陽極）／有機層（発光層を含む。）／第２の電極（陰極）とが順次積層された構成としてもよいし、この逆の積層構成としてもよい。積層構成は、例えば、ディスプレーの仕様や作製プロセス等により、適宜最適なものに決定すればよい。
【００７１】
本発明の有機ＥＬ表示体は、ディスプレイとしての応用の他、例えばメモリ読み出し／書き込み等に利用される光ピックアップ、光通信の伝送路中における中継装置、フォトカプラ等、種々の光応用デバイスに用いることができる。
【００７２】
【実施例】
以下、本発明を実施例によって具体的に説明する。
【００７３】
実施例１
１０ｃｍ画のＩＴＯ（１５００Å厚）付きガラス基板（コーニング社製７０５９）をアルカリ洗剤、純水、エタノール、アセトンにて超音波洗浄し、最後にＵＶ／Ｏ_３処理を施した。次に、水に分散した下記構造のポリエチレンジオキシチオフェン／ポリスチレンスルホン酸（ＰＥＤＯＴ／ＰＳＳ：ｍ、ｎは重合度）を直径０．５ｍｍのボールペンのカートリッジに充填した。この分散液中のＰＥＤＯＴ／ＰＳＳの含有率は、２％（質量百分率）である。基板およびボールペンを図１の装置にセットし、基板上に“ＴＤＫ”という文字をボールペンにて描き、２００℃にて５分間乾燥した。この時、描かれた部分のＰＥＤＯＴ／ＰＳＳの膜厚は５００Åであり、線幅は０．１５ｍｍであった。次に、２％（質量百分率）濃度の下記構造のポリビニルカルバゾール（ＰＶＫ：ｎは重合度、Ｍｗ＝１００，０００）と、ポリマーのモノマーユニットに対して３ｍｏｌ％となるようにテトラフェニルブタジエン（ＴＰＢ）を加えたトルエン溶液を用いて、スピンコートにより基板上に膜厚１０００Åの発光層を形成した。次に、この発光層上に、電子注入層としてのＬｉＦ層（膜厚６Å）、および補助電極としてのＡｌ層（膜厚２５００Å）をこの順で真空蒸着して陰極層を形成し、陰極層側の面を封止して目的の有機ＥＬ素子を得た。
【００７４】
ＩＴＯを陽極に、Ａｌを陰極につなぎ８Ｖの電圧をかけたところ、“ＴＤＫ”の文字がＴＰＢ由来の青色に発光しており、ボールペンにてパターニングが可能であることが確認できた。ＰＥＤＯＴ／ＰＳＳが塗布された部分は、ＰＥＤＯＴ／ＰＳＳのホール注入能力により、ＰＥＤＯＴ／ＰＳＳ未塗布の部分よりも低電圧で発光するためである。このデバイスでは、１５Ｖの電圧でもＰＥＤＯＴ／ＰＳＳ未塗布の部分からの発光は見られなかった。
【００７５】
【化３】

【００７６】
【化４】

【００７７】
実施例２
図３に示した工程で得られた有機層形成用基板を用いて実験を行った。ＩＴＯ（１５００Å厚）の幅は０．５ｍｍであり、ＳｉＯ_２、ポリイミドに覆われていない露出している部分の幅は０．３ｍｍであり、長さは０．５ｍｍである。また、ポリイミドは撥水処理が施されており、塗布された溶液は、ＩＴＯとＳｉＯ_２上に集まりやすくなっている。ＳｉＯ_２層の厚さは１６００Åとし、ポリイミド層の厚さは２０００Åとし、ポリイミド層にはテーパーを設けた。
【００７８】
２％（質量百分率）濃度のポリビニルカルバゾール（ＰＶＫ）と、ポリマーのモノマーユニットに対して３ｍｏｌ％となるようにテトラフェニルブタジエン（ＴＰＢ）を加えたトルエン溶液を青色発光層塗布溶液、ＴＰＢに変えてクマリン６（Ｃ６）を加えた溶液を緑色発光層塗布溶液、ＴＰＢに変えてローダミン６Ｇを加えた溶液を赤色発光層塗布溶液とし、それぞれを直径１．０ｍｍのボールペンのカートリッジに充填した。
【００７９】
実施例１と同様に基板洗浄を行った後、図１の装置を用い、ＩＴＯに沿って線状に、青色、緑色、赤色の順に繰り返し塗布を行った。塗布された溶液は速やかにＩＴＯとＳｉＯ_２上に集まり、レベリングした後乾燥した。発光層の厚さは１０００Åであった。次いで、実施例１と同様の電子注入層、補助電極を全面に形成し、最後に封止を行い目的の有機ＥＬ素子を得た。
【００８０】
ＩＴＯを陽極に、Ａｌを陰極につないで素子を発光させた場合、選択するＩＴＯによって、発光色が青、緑、赤のそれぞれになることが確認でき、ボールペン方式により有機ＥＬ素子のパターニングが可能であることが示された。
【００８１】
【化５】

【００８２】
【発明の効果】
本発明によれば、低コストで簡便に、有機層のパターニングを行うことができる。さらにいえば、インクジェット法のような、ノズル先端と塗布対象物との微細な距離を制御するための装置が不要であり、その制御ミスによりミスパターニングを生じることもない。それに加え、本発明は塗布対象物の表面に凹凸が存在する場合でも細かな距離制御機構を必要とせず簡易な構成により好適に塗布することができる。
【図面の簡単な説明】
【図１】本発明の有機ＥＬ製造装置の概略構成図である。
【図２】本発明の有機ＥＬ製造装置のボールペンのＺ軸方向の動きを説明する図である。
【図３】本発明に用いる有機層形成用基板の製造工程を示す図である。
【符号の説明】
１ 有機ＥＬ装置
２、２ｃ 有機層形成用基板
１１ ボールペン
１２ 載置台
１２Ｓ Ｙ方向移動ステージ
１３ 接触圧力調整用ダンパー
１４ Ｘ方向移動手段
１５ Ｚ軸方向移動手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an organic EL display, and more particularly, to a method for patterning an organic EL display using a polymer. Further, the present invention relates to an organic EL manufacturing apparatus used in a method of manufacturing an organic EL display.
[0002]
[Prior art]
Various types of organic EL elements used for organic EL displays and the like have been prototyped based on proposals for forming an organic layer by a vacuum deposition method using a low-molecular compound (for example, see Non-Patent Document 1). The stage is approaching.
[0003]
On the other hand, since the above low molecular compounds have poor thermal stability, organic EL devices using high molecular compounds have been actively developed. When a high molecular compound is used, it can be expected that excellent thermal stability not obtained by a low molecular compound can be obtained. In addition, since a polymer compound can be used to form an element by coating, the manufacturing process can be simplified as compared with a low molecular compound which must rely on an evaporation method.
[0004]
By the way, when manufacturing a display, it is necessary to pattern a material for the arrangement of the RGB elements and the like. Gravure printing, spray coating, etc. have also been attempted for coating type devices using polymer compounds, but the inkjet method has attracted attention, and the upper layer or reflective layer of a transparent pixel electrode formed on a glass substrate having thin film transistors has been attracting attention. It is disclosed that an organic light emitting layer formed for each pixel is formed and arranged between an upper layer of a pixel electrode and a reflective electrode or a transparent electrode corresponding to the upper layer of the electrode by an inkjet method. (For example, see Patent Document 1).
[0005]
The ink jet method is an excellent patterning method, but it is difficult to reduce the cost because large-scale equipment is required. In addition, since the ink-jet method is applied in a non-contact manner, a device for controlling a minute distance between the nozzle tip and the object to be coated is required, and a defect occurs in patterning due to a defect in the control or the like. In some cases.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-12377 [Non-Patent Document 1]
Applied Physics Letters, Vol. 51 (vol. 51), p913 (1987)
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for manufacturing an organic EL display body to which a simple and low-cost patterning method is applied in order to make use of characteristics by coating, and an organic EL manufacturing apparatus for carrying out the method.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a ballpoint pen method has been proposed as a simpler patterning method, and the present invention has been accomplished.
[0009]
That is, the present invention is a method for manufacturing an organic EL display having a hole injection electrode, an electron injection electrode, and at least one type of organic layer provided between these electrodes. At least one layer is patterned, and the method of manufacturing an organic EL display includes forming the patterned organic layer by applying with a ballpoint pen.
Then, it is preferable to provide a tapered edge cover around the area to be coated with the ballpoint pen and perform coating with the ballpoint pen.Furthermore, it is preferable to provide the edge cover having a water-repellent surface and perform coating with the ballpoint pen. It is preferred to do so.
It is preferable that at least one of the organic layers is an organic EL display containing a polymer compound.
Further, the manufacturing method of the present invention uses an organic EL manufacturing apparatus having a ball-point pen, and specifically uses a ball-point pen, a mounting table for mounting an organic layer forming substrate, and a patterned organic layer. And a moving means for moving a ball-point pen and / or a mounting table in order to form the organic EL device.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
[0011]
The organic EL display obtained by the present invention has a hole injection electrode (anode) and an electron injection electrode (cathode), and has at least one kind of organic layer between these electrodes. At least one layer is patterned, but the patterned organic layer is formed by coating with a ballpoint pen.
[0012]
As described above, since the patterning of the organic layer is performed using the ballpoint pen, the patterning can be performed easily and easily. In addition, since coating can be performed in accordance with the accuracy of a control unit such as an XY robot that controls the movement of a ballpoint pen, high-precision coating can be performed relatively easily. In addition, since it is a contact type application, unlike a non-contact type ink jet method, an application defect hardly occurs.
[0013]
FIG. 1 shows a configuration example of an organic EL manufacturing apparatus used for manufacturing the organic EL display of the present invention.
[0014]
The organic EL manufacturing apparatus 1 illustrated in FIG. 1 includes a mounting table 12 having a ballpoint pen 11 and mounting an organic layer forming substrate 2 on which a patterned organic layer is formed. As shown in the figure, a Y-direction movement that allows the organic layer forming substrate 2 to move in the Y direction on a horizontal plane (XY plane) is provided on the mounting table 12 on the mounting portion of the organic layer forming substrate 2. A stage 12S is provided. The ballpoint pen 11 is provided with a contact pressure adjusting damper 13 for keeping the contact pressure between the ballpoint pen 11 and the organic layer forming substrate 2 constant, and furthermore, a horizontal plane (the XY plane) of the ballpoint pen 11. ) Is provided with an X-direction moving means 14 that enables movement in the X-direction. The contact pressure adjusting damper 13 is configured to adjust the contact pressure by a spring, an air cylinder, an oil damper, a magnet, or a combination thereof. Further, the pressure may be adjusted only by the weight of the ball-point pen 11 without using these means. The contact pressure in this case is a pressure that does not damage the organic layer forming substrate 2 and is usually 10 mg (98 μN) or less, preferably 1 mg (9.8 μN) or less. The lower limit is not particularly limited, but is usually about 0.1 mg (0.98 μN).
[0015]
Further, the organic EL manufacturing apparatus 1 moves the ball-point pen 11 in the vertical direction (Z-axis direction), and controls the contact between the ball-point pen 11 and the organic layer forming substrate 2 in a Z-axis direction moving means (not shown in FIG. 1). .).
[0016]
FIG. 2 schematically shows the movement of the ball-point pen 11 in the Z-axis direction. FIG. 2 shows a Z-axis direction moving means 15 for controlling the movement of the ball-point pen 11 in the Z-axis direction. In the illustrated example, the Z-axis direction moving means 15 is attached to the damper 13 for adjusting the contact pressure of the ball-point pen 11, and FIG. FIG. 2B shows the state of being separated, the state of being in contact with the organic layer forming substrate 2 due to the movement of the ball-point pen 11, and FIG. Then, the ball pen 11 is retracted from the organic layer forming substrate 2.
[0017]
In FIG. 2, members common to those in FIG. 1 are denoted by the same reference numerals.
[0018]
Among them, adjustment of the contact pressure of the ball-point pen 11 when the ball-point pen 11 comes into contact with the organic layer forming substrate 2 as shown in FIG. 2B will be described.
[0019]
For example, the ball-point pen 11 may have a coating unit for coating the organic layer forming substrate 2 as an object to be coated and a holder unit for storing the coating unit. A case in which the contact pressure is adjusted by the weight of the ballpoint pen without providing the adjustment damper 13 will be described. In such a case, when the tip of the application portion of the ball-point pen 11, which is the contact surface of the ball-point pen 11 with the organic layer-forming substrate 2, is pressed against the surface of the organic layer-forming substrate 2, The application unit may be configured to relatively slide in a direction to cancel the moving amount of the holder unit that stores the application unit. This eliminates the need to finely control the contact pressure (pressing force) when pressing the tip of the application portion of the ball-point pen 11 against the surface of the organic layer forming substrate 2. A mechanism for pressing against the surface of the forming substrate 2 can be easily configured. In addition, the contact pressure (pressing force) of pressing the tip of the application portion against the surface of the organic layer forming substrate 2 changes according to the weight of the application portion of the ballpoint pen 11, so that the mass of the application portion of the ballpoint pen 11 is adjusted. The contact pressure (pressing force) can be adjusted by only a simple method.
[0020]
On the other hand, when the contact pressure is adjusted by the contact pressure adjusting damper 13 as shown in the illustrated example, appropriate means such as a spring provided on the ballpoint pen 11 and an oil damper (hydraulic mechanism) are used as described above. It is preferable that a pressure sensor be provided in the apparatus and the elastic force and the oil pressure of the spring be controlled based on the contact pressure (pressing force) detected by the pressure sensor.
[0021]
The organic EL manufacturing apparatus of the present invention is not limited to the illustrated example, but may be various types. For example, instead of moving the ball-point pen 11 in the X direction, the organic layer forming substrate 2 may be moved not only in the Y direction but also in the X direction. The movement of the stage 12S can be fixed, and the movement in the X, Y, and Z directions can be controlled only by the movement of the ballpoint pen 11.
[0022]
The ballpoint pen 11 has a structure for supplying a coating liquid by rotating a sphere to a surface to be coated, and is generally used, including one having the above-described configuration, such as one having a reservoir for a reservoir behind it. A structure can be used without any particular limitation.
[0023]
In addition, the organic layer forming substrate 2 is a substrate before the organic layer to be applied and formed by the ballpoint pen 11 is not yet formed. For example, the organic layer forming substrate manufactured according to the process of FIG. 2c (FIG. 3C).
[0024]
FIG. 3 schematically illustrates a step of producing the organic layer forming substrate 2c.
[0025]
First, as shown in FIG. 3A, an electrode 21 such as ITO is formed in a stripe shape with a predetermined line width and a predetermined thickness on a predetermined substrate 20 such as a glass substrate. (A-1) is a plan view of the substrate 2a thus obtained, and (a-2) is a cross-sectional view taken along line II of the substrate 2a.
[0026]
Next, as shown in FIG. 3B, a first insulating layer bank 22 is formed of an insulating inorganic material such as SiO ₂ in order to separate a pixel region. A plan view of the substrate 2b thus obtained is shown in (b-1), and a cross-sectional view taken along the line II-II is shown in (b-2). The height of the first insulating layer bank 22 is set so as to be about 0 to 100 nm thicker than the thickness of the electrode 21.
[0027]
Then, as shown in FIG. 3C, a second insulating layer bank 23 is formed on the first insulating layer bank 22 with an insulating resin such as polyimide so as to substantially cover the entire surface. . A plan view of the organic layer forming substrate 2c thus obtained is shown in (c-1), and a cross-sectional view taken along the line III-III is shown in (c-2). The height of the second insulating layer bank 23 is set so as to be about 0 to 10 μm thicker than the thickness of the first insulating layer bank 22.
[0028]
The first and second insulating layer banks 22, 23 form an edge cover. The edge cover is provided around an area applied by a ball-point pen, that is, in the illustrated example, around the exposed area of the electrode 21. As shown in (c-2), the edge cover has a taper so as to be easily traced by the ball-point pen. Is provided.
[0029]
The second insulating layer bank 23 made of an insulating resin is preferably subjected to a water-repellent treatment, so that the coating liquid easily collects on the exposed region of the electrode 21. The water-repellent treatment in the present invention generally refers to a treatment performed so as to have a property of repelling not only water but also a solvent or a dispersion medium of a coating solution, and examples thereof include a fluorination treatment.
[0030]
The substrate for forming an organic layer is not limited to this, and various substrates can be used according to the intended use.
[0031]
For example, an organic layer can be patterned by drawing with a ballpoint pen using a substrate whose entire surface is covered with electrodes such as ITO. Further, a charge injection / transport layer such as a hole injection / transport layer is drawn with a ball-point pen, and thereafter, a light-emitting layer is applied and formed on the entire surface of the substrate by spin coating or the like. It is also possible to adopt a configuration in which only the drawing area emits light by utilizing the difference.
[0032]
The line width when drawing with a ballpoint pen is usually 0.1 to 1 mm, and drawing can be performed with an accuracy within ± 10% of the set line width. As shown in FIG. 3, when a pixel region is specified in advance and the portion is coated with a ballpoint pen, fine drawing of an electrode region such as ITO can be performed by photolithography. Is preferred. In addition, it is possible to improve accuracy by devising the substrate side such as a water-repellent treatment of the insulating layer.
[0033]
In the organic EL display obtained by the present invention, it is preferable that at least one organic layer contains a polymer compound, and it is particularly preferable that an organic layer formed by patterning with a ballpoint pen contains a polymer compound. In the case of application using a ballpoint pen, considering that the film is naturally dried from the viewpoint of convenience, it is more advantageous to contain a high molecular compound rather than a low molecular compound that easily crystallizes in order to obtain good film properties. The use of a high molecular compound is also preferable in keeping the viscosity of the ink of the ballpoint pen in a suitable range.
[0034]
The coating liquid filled in the ballpoint pen may be a solution or a dispersion. When a coating solution for the light emitting layer is used, a high molecular light emitting material may be used as a solute or a dispersoid. Is used. These will be described later.
[0035]
In the present invention, examples of the organic material for forming the organic layer include a light-emitting material and a charge transporting material (general terms of an electron transporting material and a hole transporting material) which are generally used in an organic EL device. Can be used.
[0036]
For example, a light emitting layer using a polymer light emitting material, a mixed light emitting layer of a polymer light emitting material and a charge transporting material, or an electron injecting and transporting material between such a light emitting layer and a cathode (electron injecting electrode). It may have an electron injecting / transporting layer containing the same or a hole injecting / transporting layer containing a hole injecting / transporting material between the light emitting layer and the anode (hole injecting electrode). Further, instead of the electron injection / transport layer and the hole injection / transport layer, a high resistance electron injection / transport layer or a hole injection / transport layer made of an inorganic material may be provided.
[0037]
In the present invention, the organic layer preferably contains a polymer compound in order to ensure the function as an organic EL element formed by a coating method.
[0038]
In the case of a polymer, the molecular weight of such a high molecular compound is 5000 or more, usually about 5000 to 3,000,000, expressed as a weight average molecular weight Mw.
[0039]
Specifically, it is mainly used as a light emitting material and a hole transporting material. Polyethylene dioxythiophene / polystyrene sulfonate (PEDOT / PSS), polyvinyl carbazole (PVK), polyaniline / polystyrene sulfonate (Pani / PSS), a polyparaphenylenevinylene derivative of the following formula (P-1) (PPV derivative), and a polyarylfluorene derivative of the following formula (P-2), or a mixture thereof. .
[0040]
Embedded image

[0041]
(R is a 2-ethylhexyloxy group, R ′ is a methoxy group,
n represents the degree of polymerization, and Mw is 50,000. )
[0042]
Embedded image

[0043]
(R ₁ and R ₁ ′ are each an alkyl group;
Ar is an aromatic or heterocyclic group which may have a substituent,
n represents a degree of polymerization, and Mw is 5,000 to 3,000,000. )
[0044]
The light emitting layer may be a single layer or two or more layers, and a plurality of light emitting layers and a charge transport layer may be formed. Further, the light emitting layer may contain the following light emitting material and charge transport material in addition to the polymer light emitting material. Further, the polymer light emitting material and / or the charge transport material may be dispersed in a polymer compound.
[0045]
Known light-emitting materials that can be used with the polymer light-emitting material of the present invention are not particularly limited. For example, naphthalene derivatives, anthracene and its derivatives, perylene and its derivatives, polymethine-based, xanthene-based, coumarin-based, and cyanine-based dyes , Metal complexes of 8-hydroxyquinoline and its derivatives, aromatic amines, tetraphenylcyclopentadiene and its derivatives, tetraphenylbutadiene and its derivatives, and the like. Specifically, for example, known materials such as those described in JP-A-57-51781 and JP-A-59-194393 can be used.
[0046]
As the charge transporting material that can be used in the present invention, various electron transporting materials and hole transporting materials can be used, and there is no particular limitation.
[0047]
Examples of the hole transporting material include a pyrazoline derivative, an arylamine derivative, a stilpene derivative, and a triphenyldiamine derivative.
[0048]
As the electron transporting material, oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and its derivatives, naphthoquinone and its derivatives, anthraquinone and its derivatives, tetracyanoanthraquinodimethane and its derivatives, fluorene and its derivatives, Metal complexes such as diphenyldicyanoethylene and its derivatives, diphenoquinone derivatives, 8-hydroxyquinoline and its derivatives, and the like can be given.
[0049]
Specifically, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, JP-A-209988, JP-A-3-37992, And those described in JP-A-3-152184.
[0050]
Particularly, 4,4-bis (N- (3-methylphenyl) -N-phenylamino) biphenyl is used as the hole transporting material, and 2- (4-biphenylyl) -5- (4-t-) is used as the electron transporting material. (Butylphenyl) -1,3,4-oxadiazole, benzoquinone, anthraquinone, and tris (8-quinolinolato) aluminum are preferred.
[0051]
Of these, one or both of the electron transporting compound and the hole transporting compound may be used at the same time. Each of these compounds may be used alone or in combination.
[0052]
Since the amount of the charge transporting material used varies depending on the type of the compound to be used and the like, the optimum amount of addition may be determined within a range that does not impair the sufficient film-forming property and the light-emitting characteristics. Usually, it is 1 to 40% (mass percentage), more preferably 2 to 30% (mass percentage) based on the luminescent material.
[0053]
In addition, the organic layer may have an electron injection / transport layer, a hole injection / transport layer, or the like in addition to the light emitting layer. The electron transporting material and the hole transporting material used for the electron injecting and transporting layer and the hole injecting and transporting layer made of an organic material may be any of the above-mentioned materials that are suitable in relation to the light emitting layer, the electrode, and the like.
[0054]
The thickness of the light emitting layer when using the above polymer light emitting material is 0.5 nm to 10 μm, preferably 1 nm to 1 μm. In order to increase the current density and the luminous efficiency, the range of 10 to 500 nm is preferable. When the film is formed into a thin film by a coating method, it is desirable to heat and dry at a temperature of 30 to 200 ° C., preferably 60 to 100 ° C. under reduced pressure or an inert atmosphere in order to remove the solvent.
[0055]
In the case where the charge injection / transport layer is formed below the light emitting layer, a certain degree of heat resistance is required when a heat polymerization step is required for forming the light emitting layer. In this case, a compound having a glass transition temperature of preferably 100 ° C. or higher, more preferably 150 ° C. or higher, particularly 200 ° C. or higher is preferable. The upper limit of the glass transition temperature is not particularly limited, but is about 300 ° C.
[0056]
The thickness of the organic hole injecting and transporting layer and the thickness of the electron injecting and transporting layer are not particularly limited and vary depending on the forming method, but are preferably about 5 to 500 nm, particularly preferably 10 to 300 nm. When a hole injection layer and a transport layer are provided, the thickness of the injection layer is preferably 1 nm or more, and the thickness of the transport layer is preferably 1 nm or more. At this time, the upper limit of the thickness of the injection layer and the transport layer is generally about 500 nm for the injection layer and about 500 nm for the transport layer.
[0057]
The solvent or dispersion medium used for forming the organic layer of the present invention is not particularly limited as long as the organic material dissolves or disperses and does not cause any trouble during coating. Specifically, those generally used such as alcohols, hydrocarbons, ketones, and ethers can be used. Among them, chloroform, methylene chloride, dichloroethane, tetrahydrofuran, toluene, xylene and the like are preferable. Further, water or the like is used as the dispersion medium. In the case of a polymer material, although it depends on the structure and molecular weight of the polymer material, it can be generally dissolved or dispersed in these solvents or dispersion media in an amount of 0.1% (mass percentage) or more. Similar contents may be used for organic materials other than polymers.
[0058]
When the cathode (electron injection electrode) is used in combination with an electron injection layer such as an inorganic electron injection layer, it is not necessary to have a low work function and an electron injection property. There is no need to use a normal metal. Among them, in terms of conductivity and ease of handling, one or two or more selected from Al, Ag, In, Ti, Cu, Au, Mo, W, Pt, Pd and Ni, particularly Al and Ag. Metal elements are preferred. The thickness of these cathodes may be a certain thickness or more that can provide electrons to the high-resistance inorganic electron injecting and transporting layer, and may be 50 nm or more, preferably 100 nm or more. The upper limit is not particularly limited, but usually, the thickness may be about 50 to 500 nm.
[0059]
Further, as a cathode (electron injection electrode), the following may be used as necessary. For example, metal elements such as K, Cs, Li, Na, Mg, La, Ce, Ca, Sr, Ba, Sn, Zn, and Zr, or two or three components containing them to improve stability. Alloy system, for example, Ag-Mg alloy (Ag amount 0.1-50% (atomic ratio)), Al-Li alloy (Li amount 0.01-14% (atomic ratio)), In-Mg alloy (Mg: 50 To 80% (atomic ratio)), Al.Ca alloy (Ca amount: 0.01 to 20% (atomic ratio)), and the like. The thickness of the cathode (electron injecting electrode) may be a certain thickness or more capable of sufficiently injecting electrons, and may be 0.1 nm or more, preferably 0.5 nm or more, particularly 1 nm or more. The upper limit is not particularly limited, but usually, the thickness may be about 1 to 500 nm. An auxiliary electrode (protection electrode) may be further provided on the cathode (electron injection electrode).
[0060]
The thickness of the auxiliary electrode may be a certain thickness or more, preferably 50 nm or more, more preferably 100 nm or more, particularly 100 to 500 nm, in order to secure electron injection efficiency and prevent entry of moisture, oxygen or an organic solvent. Is preferable. If the auxiliary electrode layer is too thin, the effect cannot be obtained, and the step coverage of the auxiliary electrode layer is reduced, and the connection with the terminal electrode is not sufficient. On the other hand, if the auxiliary electrode layer is too thick, the stress of the auxiliary electrode layer increases, which causes adverse effects such as an increase in the growth rate of dark spots. As the auxiliary electrode, an optimum material may be selected and used depending on the material of the electron injection electrode to be combined. For example, if importance is placed on ensuring electron injection efficiency, a low-resistance metal such as Al may be used, and if importance is placed on sealing properties, a metal compound such as TiN may be used.
[0061]
The total thickness of the cathode (electron injection electrode) and the auxiliary electrode is not particularly limited, but may be generally about 50 to 500 nm.
[0062]
The material of the anode (hole injection electrode) is preferably a material capable of efficiently injecting holes into the inorganic hole injection / transport layer or the organic hole injection / transport layer, and is preferably a substance having a work function of 4.5 eV to 5.5 eV. . Specifically, any of tin-doped indium oxide (ITO), zinc-doped indium oxide (IZO), indium oxide (In ₂ O ₃ ), tin oxide (SnO ₂ ), and zinc oxide (ZnO) was used as a main composition. Are preferred. These oxides may deviate somewhat from their stoichiometric composition. The mixing ratio of SnO ₂ to In ₂ O ₃ is preferably 1 to 20% (mass percentage), and more preferably 5 to 12% (mass percentage). The mixing ratio of ZnO to In ₂ O ₃ in IZO is usually about 12 to 32% (mass percentage).
[0063]
The anode (hole injection electrode) may contain silicon oxide (SiO ₂ ) to adjust the work function. The content of silicon oxide (SiO ₂ ) is preferably about 0.5 to 10% in terms of a molar ratio of SiO _{2 to} ITO. By containing SiO ₂ , the work function of ITO increases.
[0064]
It is preferable that the electrode on the light extraction side has a light transmittance of 50% or more, more preferably 80% or more, particularly 90% or more for the emission wavelength band, usually 400 to 700 nm, particularly for each emitted light. If the transmittance is too low, the light emission itself from the light emitting layer is attenuated, and it becomes difficult to obtain the luminance required for the light emitting element. In that case, the thickness of the electrode is preferably in the range of 50 to 500 nm, particularly preferably 50 to 300 nm. The upper limit is not particularly limited. However, if the thickness is too large, there is a concern that the transmittance may decrease or peeling may occur. If the thickness is too small, a sufficient effect cannot be obtained, and there is a problem in film strength at the time of manufacturing. Such an electrode is often the anode.
[0065]
Furthermore, in order to prevent deterioration of the organic layer and the electrodes of the element, it is preferable to seal the element with a sealing plate or the like. The sealing plate adheres and seals the sealing plate using an adhesive resin layer in order to prevent moisture from entering. Sealing gas, Ar, He, an inert gas such as _{N 2} is preferable. Further, the moisture content of the sealing gas is preferably 100 ppm or less, more preferably 10 ppm or less, and particularly preferably 1 ppm or less. Although there is no particular lower limit for this water content, it is usually about 0.1 ppm.
[0066]
In the present invention, examples of the substrate on which the organic EL structure is formed include an amorphous substrate (eg, glass, quartz, etc.) and a crystalline substrate (eg, Si, GaAs, ZnSe, ZnS, GaP, InP, etc.), Alternatively, a substrate in which a crystalline, amorphous, or metal buffer layer is formed on these crystalline substrates can also be used. As a metal substrate, Mo, Al, Pt, Ir, Au, Pd, or the like can be used, and a glass substrate is preferably used. When the substrate is on the light extraction side, it is preferable that the substrate has the same light transmittance as the above-mentioned electrodes.
[0067]
Further, in the present invention, a large number of elements may be arranged on a plane. By changing the emission color of each element arranged on a plane, a color display can be obtained.
[0068]
The emission color may be controlled by using a color filter film, a color conversion film containing a fluorescent substance, or a dielectric reflection film on the substrate.
[0069]
The organic EL display of the present invention is generally used as a DC drive type or pulse drive type EL display, but may be driven by AC. The applied voltage is usually about 2 to 30V.
[0070]
The organic EL display of the present invention may have a configuration in which, for example, a substrate / first electrode (anode) / organic layer (including a light-emitting layer) / second electrode (cathode) are sequentially stacked, The reverse lamination structure may be adopted. The lamination structure may be appropriately determined according to, for example, the specifications of the display and the manufacturing process.
[0071]
INDUSTRIAL APPLICABILITY The organic EL display of the present invention is used not only as a display but also for various optical devices such as an optical pickup used for memory read / write, a relay device in a transmission line of optical communication, a photocoupler, and the like. be able to.
[0072]
【Example】
Hereinafter, the present invention will be described specifically with reference to Examples.
[0073]
Example 1
10cm painting ITO (1500 Å thick) with glass substrate (Corning Corporation product 7059) was subjected to ultrasonic cleaning with an alkali detergent, pure water, ethanol, acetone, it was subjected to the last UV / _{O 3} treatment. Next, a polyethylene dioxythiophene / polystyrene sulfonic acid (PEDOT / PSS: m, n: degree of polymerization) having the following structure and dispersed in water was filled in a ball-point pen cartridge having a diameter of 0.5 mm. The content of PEDOT / PSS in this dispersion is 2% (percent by mass). The substrate and the ballpoint pen were set in the apparatus shown in FIG. 1, and the letters “TDK” were drawn on the substrate with the ballpoint pen, and dried at 200 ° C. for 5 minutes. At this time, the thickness of the PEDOT / PSS in the drawn portion was 500 °, and the line width was 0.15 mm. Next, a 2% (mass percentage) concentration of polyvinyl carbazole having the following structure (PVK: n is a degree of polymerization, Mw = 100,000), and tetraphenylbutadiene (TPB) so as to be 3 mol% with respect to the monomer unit of the polymer. The light emitting layer having a thickness of 1000 ° was formed on the substrate by spin coating using the toluene solution to which (1) was added. Next, on this light emitting layer, a LiF layer (thickness: 6 °) as an electron injection layer and an Al layer (thickness: 2500 °) as an auxiliary electrode are vacuum-deposited in this order to form a cathode layer. The surface on the side was sealed to obtain an intended organic EL device.
[0074]
When a voltage of 8 V was applied by connecting ITO to the anode and Al to the cathode, the letters "TDK" emitted blue light derived from TPB, confirming that patterning was possible with a ballpoint pen. This is because the portion where PEDOT / PSS is applied emits light at a lower voltage than the portion where PEDOT / PSS is not applied due to the hole injection capability of PEDOT / PSS. In this device, even at a voltage of 15 V, no light emission was observed from the portion where PEDOT / PSS was not applied.
[0075]
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[0076]
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[0077]
Example 2
An experiment was performed using the organic layer forming substrate obtained in the step shown in FIG. The width of ITO (1500 mm thick) is 0.5 mm, the width of the exposed portion not covered with SiO ₂ or polyimide is 0.3 mm, and the length is 0.5 mm. Further, the polyimide has been subjected to a water-repellent treatment, and the applied solution tends to collect on ITO and SiO ₂ . The thickness of the SiO ₂ layer was 1600 °, the thickness of the polyimide layer was 2000 °, and the polyimide layer was tapered.
[0078]
A toluene solution in which polyvinylcarbazole (PVK) having a concentration of 2% (mass percentage) and tetraphenylbutadiene (TPB) were added in an amount of 3 mol% based on the polymer monomer unit was changed to a blue light emitting layer coating solution, TPB. The solution to which coumarin 6 (C6) was added was changed to a green light-emitting layer coating solution, and the solution to which rhodamine 6G was added instead of TPB was used as a red light-emitting layer coating solution.
[0079]
After cleaning the substrate in the same manner as in Example 1, using the apparatus shown in FIG. 1, coating was repeatedly performed in a linear fashion along the ITO in the order of blue, green, and red. The applied solution was quickly collected on ITO and SiO ₂ , leveled and dried. The thickness of the light emitting layer was 1000 °. Next, the same electron injection layer and auxiliary electrode as in Example 1 were formed on the entire surface, and finally sealing was performed to obtain a target organic EL element.
[0080]
When the device emits light by connecting ITO to the anode and Al to the cathode, it can be confirmed that the emission color becomes blue, green, and red, respectively, depending on the selected ITO, and it is possible to pattern the organic EL device by the ballpoint pen method. It was shown to be.
[0081]
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[0082]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, patterning of an organic layer can be performed easily at low cost. Furthermore, there is no need for a device for controlling the minute distance between the nozzle tip and the object to be coated, such as the ink-jet method, and no mis-patterning occurs due to a control mistake. In addition, in the present invention, even when unevenness is present on the surface of the object to be coated, the coating can be suitably performed with a simple configuration without requiring a fine distance control mechanism.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an organic EL manufacturing apparatus of the present invention.
FIG. 2 is a diagram illustrating movement of a ball-point pen in the Z-axis direction of the organic EL manufacturing apparatus according to the present invention.
FIG. 3 is a diagram showing a process of manufacturing an organic layer forming substrate used in the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 organic EL device 2, 2 c organic layer forming substrate 11 ballpoint pen 12 mounting table 12 S Y-direction moving stage 13 Contact pressure adjusting damper 14 X-direction moving means 15 Z-axis moving means

Claims (6)

A method for producing an organic EL display having a hole injection electrode, an electron injection electrode, and at least one organic layer provided between these electrodes,
At least one of the organic layers is patterned,
A method for manufacturing an organic EL display, wherein the formation of the patterned organic layer is performed by coating with a ball-point pen. 2. The method for manufacturing an organic EL display according to claim 1, wherein a tapered edge cover is provided around a region to be coated with a ballpoint pen, and coating is performed with a ballpoint pen. 3. The method for manufacturing an organic EL display according to claim 2, wherein the edge cover having a water-repellent surface is provided, and the application is performed using a ballpoint pen. The method according to claim 1, wherein at least one of the organic layers contains a polymer compound. An organic EL manufacturing apparatus having a ballpoint pen used in the method for manufacturing an organic EL display according to claim 1. 6. The organic EL manufacturing apparatus according to claim 5, further comprising a ballpoint pen, a mounting table on which the substrate for forming an organic layer is mounted, and moving means for moving the ballpoint pen and / or the mounting table for forming a patterned organic layer.

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