JP2004079409A - Manufacturing method of organic el panel and sealing device used in manufacturing method of organic el panel - Google Patents

Manufacturing method of organic el panel and sealing device used in manufacturing method of organic el panel Download PDF

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JP2004079409A
JP2004079409A JP2002240359A JP2002240359A JP2004079409A JP 2004079409 A JP2004079409 A JP 2004079409A JP 2002240359 A JP2002240359 A JP 2002240359A JP 2002240359 A JP2002240359 A JP 2002240359A JP 2004079409 A JP2004079409 A JP 2004079409A
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Prior art keywords
organic
substrate
sealing
panel
manufacturing
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JP2002240359A
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Japanese (ja)
Inventor
Katsuji Yoshikawa
吉川 勝司
Kazuya Naito
内藤 和哉
Kazunori Sakai
坂井 一則
Masahiro Minagawa
皆川 正寛
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Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
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Priority to JP2002240359A priority Critical patent/JP2004079409A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an organic EL panel for manufacturing an organic EL panel without bending and a sealing device in the manufacturing method of the organic EL panel. <P>SOLUTION: An organic EL element is formed on a support substrate 8 pinching an organic layer at least including a luminous layer with a pair of electrodes. A sealing substrate 23 airtightly covers the organic EL element. The manufacturing method of the organic EL panel includes a sealing process for joining through an ultraviolet curing adhesive, which joins a sealing substrate 23 with the support substrate 8 at a temperature state almost equal with the support substrate 8. The sealing device is provided with a holding mechanism 29 for holding the support substrate 8 and a loading pedestal 24 for loading the sealing substrate 23, with the sealing substrate 23 and the support substrate 8 joined by the ultraviolet curing adhesive. The loading pedestal 24 is provided with a heating means 23a for heating the sealing substrate 23 to almost the same temperature state as the support substrate 8. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、少なくとも一方が透光性の一対の電極により挟持され所定の発光をなす有機エレクトロルミネッセンス素子(以下、有機EL素子という)を備えた有機ELパネルを得るための製造方法、及びその有機ELパネルの製造方法で用いられる封止装置に関するものである。
【0002】
【従来の技術】
自発光素子であるためバックライト照明が不要であること、視野角が広く、大型の表示パネルに適すること等から有機EL素子を用いた有機ELパネルが注目されている。
【0003】
このような有機ELパネルは、ガラス材料からなる支持基板である透光性基板の所定箇所に、所定パターンの透明電極を形成し、前記透明電極上に絶縁層,正孔注入層,正孔輸送層,発光層,電子輸送層を順次積層して有機層を形成し、前記有機層上に電子注入層及び背面電極を積層形成して有機EL素子を得て、前記有機EL素子を封止基板によって気密的に覆うことで得られるものである。
【0004】
かかる有機ELパネルの製造方法は、前記有機EL素子を構成する各部(正孔注入層,正孔輸送層,発光層,電子輸送層,電子注入層,背面電極)に対応する複数の蒸着室を有する蒸着装置に前記透光性基板に投入し、前記蒸着装置に備えられる各蒸着室を制御するコントロール装置によって設定される蒸着温度及び前記各層の膜厚等の生産条件に基づいて、前記透光性基板上に前記有機EL素子を形成するとともに、前記有機EL素子が形成される前記透光性基板を封止装置内に投入し、前記有機EL素子を覆うように前記透光性基板と前記封止基板とを接合することで有機ELパネルを得ることが一般的である。
【0005】
図7に示すように、封止装置の封止室B1は、封止基板51を載せるための載置台52と、基板ホルダー53を介して配設される透光性基板(有機EL素子が形成された状態の透光性基板)54を保持するための保持機構55と、載置台52をシリンダー等の駆動手段によって上方に移動させる上昇機構56とを有している。また、封止室B1には、透光性基板54と封止基板51とをUV硬化型接着剤を介して接合させるため、紫外線を照射するための紫外線ランプ(以下、UVランプという)57が配設されている。封止室B1は、上昇機構56によって封止基板51を上昇させ、透光性基板54に対し所定の圧力を付与した状態で封止基板51を当接させた後、UVランプ57からの紫外線をUV硬化型接着剤に照射させることで、両部材を気密性良く封止するものである。
【0006】
【発明が解決しようとする課題】
しかしながら、封止室B1内における透光性基板54と封止基板51の温度差が大きいため、透光性基板54に封止基板51を接合した有機ELパネルを封止装置B1から外に取り出して通常温度に戻すと、有機ELパネルが湾曲するという問題を有していた。これは、封止室B1内の上方部はUVランプ57に近いため、下方部よりも温度が高く、透光性基板54の温度が封止基板51よりも高くなり、熱膨張による透光性基板54の伸びが封止基板51よりも大きい状態で、透光性基板54と封止基板51を接合すると、有機ELパネルを封止装置B1から取り出して透光性基板54と封止基板51の温度が等しくなったときに、透光性基板54の収縮が封止基板51よりも大きいためであると考えられる。例えば、封止室B1の上方部と下方部の温度差が約40℃、透光性基板の幅Wが400mmの場合で、高さhが約2mmの湾曲が発生する(図8参照)。このような湾曲した有機ELパネルには熱収縮による残留応力があり、僅かな衝撃でも破損する虞がある。
本発明は、この問題に鑑みなされたものであり、湾曲のない有機ELパネルを製造する有機ELパネルの製造方法、及びその有機ELパネルの製造方法で用いられる封止装置を提供するものである。
【0007】
【課題を解決するための手段】
本発明は、前記課題を解決するため、少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板と、前記有機EL素子を気密的に覆うための封止基板と、を紫外線硬化型接着剤を介し接合する封止工程を含む有機ELパネルの製造方法であって、前記封止工程は、前記支持基板と略同じ温度状態で前記封止基板を前記支持基板に接合してなるものである。
【0008】
また、本発明は、少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板を保持する保持機構と、前記有機EL素子を気密的に覆うための前記封止基板を載せる載置台とを有し、前記封止基板と前記支持基板とを紫外線硬化型接着剤を介し接合する封止装置であって、前記載置台は、前記封止基板を前記支持基板と略同じ温度状態に加熱する加熱手段を有するものである。
【0009】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づき説明する。
【0010】
図1及び図2は、本発明の有機ELパネルの製造装置の一例を示すものである。有機ELパネルの製造装置は、蒸着装置Aと、封止装置Bと、コントロール装置Cと、ライン端末Dと、透光性基板(支持基板)投入装置Eと、接着剤塗布装置Fと、封止基板投入装置Gと、取り出し装置Hとから構成されている。
【0011】
蒸着装置Aは、第1,第2のブロックa,bを有しており、各ブロックa,b内は真空状態が確保されている。第1のブロックaは、プラズマ処理工程である前処理室a1と、正孔注入層形成工程である第1蒸着室a2と、正孔輸送層形成工程である第2蒸着室a3と、第1発光層形成工程である第3蒸着室a4と、第2発光層形成工程である第4蒸着室a5と、第1ブロックaの各蒸着室a2,a3,a4,a5における有機ELパネルの表示形態に応じた蒸着マスクを保管する第1蒸着マスク保管室a6と、透光性基板投入装置Eに接続され、支持基板である透光性基板を蒸着装置A内に投入するための投入室a7とを有している。前述した各部屋間の透光性基板の搬送は、サーボモータ等の駆動手段によって回転可能に設けられ、前記各部屋の奥行き方向及び高さ方向に移動可能な搬送ロボットa8が用いられている。また各蒸着室a2,a3,a4,a5、前処理室a1及び第1蒸着マスク保管室a6には、メンテナンスを行うための開閉扉a9がそれぞれ設けられている。
【0012】
蒸着装置Aの第2のブロックbは、第3発光層形成工程である第5蒸着室b1と、第4発光層形成工程である第6蒸着室b2と、電子輸送層形成工程である第8蒸着室b3と、電子注入層形成工程である第7蒸着室b4と、背面電極形成工程である第9蒸着室b5と、第2のブロックbの各蒸着室b1,b2,b3,b4,b5における有機ELパネルの表示形態に応じた蒸着マスクを保管する第2蒸着マスク保管室b6とを有している。前述した各部屋間の透光性基板の搬送は、サーボモータ等の駆動手段によって回転可能に設けられ、前記各部屋の奥行き方向及び高さ方向に移動可能な搬送ロボットb7が用いられている。また各蒸着室b1,b2,b3,b4,b5及び第2蒸着マスク保管室b6には、メンテナンスを行うための開閉扉b8がそれぞれ設けられている。
【0013】
また、蒸着装置Aの第1,第2のブロックa,b間には、各部ブロックa,bを接続する第1受渡室Jが設けられている。第1受渡室Jは、第1ブロックa側及び第2ブロックb側にそれぞれ設けられるシャッター機構と、各シャッター機構間に設けられ、後述する透光性基板を第1のブロックa側から第2のブロックb側へと搬送するスライド機構とが設けられ、各ブロックa,bにそれぞれ設けられる搬送ロボットa8,b7によって前記透光性基板の受け渡しがなされる。
【0014】
ここで、図3を用いて、蒸着装置Aの第1,第2ブロックa,bに配設されている各蒸着室(a2〜a5,b1〜b5)について説明する。蒸着室は、排気ポート1を介して図示しない真空ポンプで高真空に排気された真空室2を有している。真空室2の下側には、蒸着材料3を収納するルツボ(クヌンセンセル)4が配設されており、このルツボ4には、加熱コイル5が捲回されるとともに、加熱コイル5による加熱温度を正確にルツボ4に伝達するための熱遮蔽板6がルツボ4及び加熱コイル5の外側を覆うように配設される。またルツボ4には、ルツボ4の温度を検出するための熱電対等からなる温度センサ7が設けられている。温度センサ7は、後述する生産管理情報に基づいて各蒸着室の蒸着温度制御を行うためのコントロール装置Cへ蒸着温度データを出力するもので、コントロール装置Cは、前記生産管理情報に基づく蒸着温度になるように加熱コイル5に対してフィードバック制御(電流量調整)を行い、ルツボ4の温度を前記生産管理情報に基づく適正温度になるように制御するものである。
【0015】
一方、真空室2の上側には、ガラス材料からなり、正孔注入層,正孔輸送層,発光層,電子輸送層,電子注入層及び背面電極を形成するための透光性基板8を備えた基板ホルダー9と、透光性基板8に所定の蒸着パターンを形成するための蒸着マスク10を備えたマスクホルダー11とを、ルツボ4が配設される蒸着源に対し位置決め保持するための保持機構12が備えられている。
【0016】
また、真空室2内において、ルツボ4と透光性基板8との間には、成膜される各層の厚みを制御するシャッター13と、膜の厚みをモニタする膜厚計14とが配設される。従ってコントロール装置Cは、成膜領域15を膜厚計14によってモニタし、この膜厚計14によって得られた成膜データに基づいて所定の演算を行い、この演算結果から透光性基板8に形成される膜厚を算出するとともに、シャッター13を動作させることで膜厚を管理する。
【0017】
封止装置Bは、封止基板と透光性基板8とをUV硬化型接着剤を介し接合するため、両部材を重ね合わせた状態で紫外線を照射させる封止室B1と、有機ELパネルの表示形態に応じて紫外線照射マスク(以下、UV照射マスクという)を保管するUV照射マスク保管室(第2のストック部)B2と、封止基板を封止装置B内に投入するための投入部B3と、封止室B1を経て得られた有機ELパネルを外部に搬出する取出装置Hと接続される排出部B4と、接着剤塗布装置Fと投入室B3との間に設けられ、封止基板23に吸着剤Sを塗布する吸着剤塗布室B5とを有しており、封止装置B内は窒素によって満たされている。
【0018】
吸着剤塗布室B5では、吸着剤Sがディスペンサ等の塗布手段によって、封止基板23の凹部23aに塗布される。吸着剤Sの塗布量は、凹部23aの周囲長さに応じて設定することが望ましく、例えばクリーム状の吸着剤Sの場合は、1.0mg/cm以上とすることが望ましい。なお、凹部23aの周囲長さとは、例えば凹部23aの横方向の幅がLで、縦方向の幅がMである場合は、2・L+2・Mである(図4参照)。
【0019】
封止装置Bの前記各部屋間の封止基板の搬送は、サーボモータ等の駆動手段によって回転可能に設けられ、前記各部屋の奥行き方向及び高さ方向に移動可能な搬送ロボットB6が用いられる。また、封止室B1及びUV照射マスク保管室B2には、メンテナンス用の開閉扉B7がそれぞれ設けられている。
【0020】
ここで、図5を用いて、封止装置Bに備えられる封止室B1について説明する。封止室B1は、排気ポート20を介して図示しない真空ポンプで室内が略真空状態になるように排気され、窒素導入口21から窒素が導入されることで、酸素の濃度が100ppm以下及び露点が−70℃以下の窒素室22が設けられている。窒素室22の略中央には、透光性基板8上に形成される有機EL素子を気密的に覆うためのガラス材料からなる封止基板23を乗せるための載置台24をシリンダー等の駆動手段によって上方に移動させる上昇機構25が設けられている。
【0021】
載置台24には、封止基板23を透光性基板8と略同じ温度状態まで加熱するための電熱線等からなるヒーター(加熱手段)24aが備えられている。図6に示すように、ヒーター24aは搭置台24の内部に蛇行状に埋設されており、その両端に電気的に接続されたヒーター回路24bによって所定の電圧が印加され、封止室B1内の透光性基板8の近傍と略同じ60〜70℃に搭置台24が加熱される。封止室B1内の温度は常に一定であるので、ヒーター24aに印加する電圧値は一定でも良いが、搭置台24にサーミスタ等からなる温度センサを設けて、この温度センサから出力される温度データに基づいて、ヒーター24aに印加する電圧をフィードバック制御によって調整しても良い。
【0022】
一方、窒素室22の上側には、透光性基板8と封止基板23とをUV硬化型接着剤を介して接合させるため、紫外線を照射するための紫外線照射装置(以下、UV照射装置という)26が配設されて、UV照射装置26の下方には、マスクホルダー27を介して配設されるUV照射マスク28と、基板ホルダー9を介して配設される透光性基板(有機EL素子が形成された状態の透光性基板)8とを保持するための保持機構29が設けられている。UV照射装置26には、紫外線を照射するUVランプ30と、紫外線を遮ることが可能なシャッター31とが備えられており、コントロール装置Cは、シャッター31の開閉によって、UVランプ30からの紫外線をUV硬化型接着剤に照射する時間を管理する。
【0023】
かかる封止室B1は、上昇機構25によって封止基板23を上昇させ、透光性基板8に対し所定の圧力を付与した状態で封止基板23を当接させた後、UV照射装置26からの紫外線をUV照射マスク28を介してUV硬化型接着剤の塗布位置に照射させることで、両部材を気密性良く封止するものである。
【0024】
蒸着装置Aの第2のブロックbと封止装置Bとの間には、両装置A,B間を接続する第2受渡室Kが設けられている。第2受渡室Kは、蒸着装置A側及び封止装置B側にそれぞれ設けられるシャッター機構と、各シャッター機構間に設けられ、透光性基板8を蒸着装置Aから封止装置B側へと搬送するスライド機構とが設けられ、両装置A,Bにそれぞれ設けられる搬送ロボットb7,B6によって透光性基板8の受け渡しがなされる。
【0025】
コントロール装置Cは、蒸着装置A及び封止装置Bを制御するものである。コントロール装置Cは、蒸着装置Aの第1のブロックaの前処理室a1のプラズマ処理に伴う制御、第1のブロックaの各蒸着室a2,a3,a4,a5及び第2のブロックbの各蒸着室b1,b2,b3,b4,b5における蒸着温度調整,成膜の膜厚調整、生産管理情報に応じて決定される搬送ルートに伴う各搬送ロボットa8,b7,B6の駆動制御、封止装置Bの封止室B1における封止処理等を行わせるものであり、蒸着装置A及び封止装置Bにおける駆動系全般の制御を行う制御手段である。
【0026】
ライン端末Dは、生産数量、有機EL素子の形成パターンに基づく蒸着マスクの種類及びUV照射マスクの種類、透光性基板8及び封止基板23の投入枚数、蒸着装置Aの各蒸着室a2,a3,a4,a5,b1,b2,b3,b4,b5における蒸着温度(各蒸着室のルツボの温度),有機EL素子を構成する各層の膜厚及び前記有機ELパネルの発光層の種類等の蒸着に関する生産条件等の生産管理情報を有機ELパネルの機種毎に設定するとともに、前記機種毎に前記生産管理情報を記憶するもので、パーソナルコンピュータやシーケンサ等によって構成されている。前記生産管理情報を設定及び表示するものとして、例えばタッチパネルが備えられている。
【0027】
ライン端末Dは、コントロール装置Cと透光性基板投入装置Eと封止基板投入装置Gと接着剤塗布装置Fとにネットワーク接続され、コントロール装置Cには、機種及び前記機種に伴う各蒸着室の生産条件に関するデータを転送し、透光性基板投入装置E,封止基板投入装置G及び接着剤塗布装置Fには、機種及び生産数量に関するデータが転送される。
【0028】
透光性基板投入装置Eは、ライン端末Dから転送される前記生産管理情報に基づいて、透明電極及び絶縁層が形成された透光性基板8を蒸着装置Aに投入するものであり、洗浄工程を終えた透光性基板8をコンベア等の搬送手段を介して徐々に真空雰囲気にするための複数のブロック(部屋)を有するとともに、蒸着装置Aの第1ブロックaにおける投入部a7に接続される。
【0029】
透光性基板投入装置Eは、投入される透光性基板8が機種に伴う適正なる透光性基板であるか否かを判定する誤投入判定機能を有している。前記誤投入判定機能は、例えば所定の判定パターンが形成された透光性基板8を用意し、この判定パターンをCCDカメラを用いて、2次元判定処理を行うことで、投入される透光性基板が適正なる機種の透光性基板であるか否かを判定し、誤投入である場合に透光性基板性入装置Eによる基板投入動作を停止し、誤投入なる警報を発して製造ラインの作業者に知らせるものである。
【0030】
封止基板投入装置Gは、ライン端末Dから転送される前記生産管理情報に基づいて、洗浄工程後の封止基板23を接着剤塗布装置Fに投入するものである。
【0031】
封止基板投入装置Gは、投入される封止基板23が機種に伴う適正なる封止基板23であるか否かを判定する誤投入判定機能を有している。前記誤投入判定機能は、例えば所定の判定パターンが形成された封止基板23を用意し、この判定パターンを透過型のラインセンサを用いて、前記判定パターンのコード信号を判定することで、投入される封止基板23が適正なる機種の封止基板23であるか否かを判定し、誤投入である場合に封止基板性入装置Gによる基板投入動作を停止し、誤投入なる警報を発して製造ラインの作業者に知らせるものである。
【0032】
接着剤塗布装置Fは、ライン端末Dから転送される前記生産管理情報に基づいて、封止基板23にUV硬化型接着剤を塗布する。接着剤塗布装置Fは、例えばX−Y−Z方向に移動可能なロボットにディスペンサが取り付けられてなるものである。接着剤塗布装置Fは、ライン端末Dから転送される機種データに基づいて、適正なる塗布パターンを選定しこの塗布ターンによって前記接着剤を封止基板23の透光性基板8との接合面に塗布してなるものである。
【0033】
取出装置Hは、封止装置Bの排出部B4に接続され、コンベア等の搬送手段によって封止工程後の有機ELパネルを取り出すものである。
【0034】
以上説明した有機ELパネルの製造方法によれば、搭置台24に設けられたヒーター24aによって搭置台24が加熱されるため、封止工程における封止基板23の温度が透光性基板8と略同じになり、有機ELパネルを封止室B1から取り出したときも、封止基板23と透光性基板8の収縮が等しいため、有機ELパネルの湾曲が発生しない。
【0035】
本実施の形態により製造された有機ELパネルは、熱収縮による残留応力がないため、従来のように僅かな衝撃で破損の虞がなく、また、その有機ELパネルを保持するためのホルダーの設計で、有機ELパネルの湾曲を考慮しなくても良いという利点を有する。
【0036】
【発明の効果】
本発明は、少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板と、前記有機EL素子を気密的に覆うための封止基板と、を紫外線硬化型接着剤を介し接合する封止工程を含む有機ELパネルの製造方法であって、前記封止工程は、前記支持基板と略同じ温度状態で前記封止基板を前記支持基板に接合してなるものであり、封止工程における支持基板と封止基板の温度が略同じくなるため、湾曲がない有機ELパネルを得ることができる。
【0037】
また、本発明は、少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板を保持する保持機構と、前記有機EL素子を気密的に覆うための前記封止基板を載せる載置台とを有し、前記封止基板と前記支持基板とを紫外線硬化型接着剤を介し接合する封止装置であって、前記載置台は、前記封止基板を前記支持基板と略同じ温度状態に加熱する加熱手段を有するものであり、封止工程における支持基板と封止基板の温度が略同じくなるため、湾曲がない有機ELパネルを得ることができる。
【図面の簡単な説明】
【図1】本発明の実施の形態における有機ELパネルの製造装置を示すブロック図。
【図2】同上実施の形態の有機ELパネルの製造装置を示す図。
【図3】同上実施の形態の蒸着装置における蒸着室を説明する図。
【図4】同上実施の形態の封止基板の斜視図。
【図5】同上実施の形態の封止装置における封止室を説明する図。
【図6】同上実施の形態の搭置台の正面図。
【図7】従来例を示す封止装置の概略図。
【図8】同上従来例を示す有機ELパネルの側面図。
【符号の説明】
B  封止装置
B1 封止室
8  透光性基板(支持基板)
23  封止基板
24  搭置台
29  保持機構
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a manufacturing method for obtaining an organic EL panel having an organic electroluminescence element (hereinafter, referred to as an organic EL element) that emits a predetermined light and is sandwiched between a pair of translucent electrodes, and an organic device for the organic EL panel. The present invention relates to a sealing device used in a method for manufacturing an EL panel.
[0002]
[Prior art]
An organic EL panel using an organic EL element has attracted attention because it is a self-luminous element and does not require backlight illumination, has a wide viewing angle, and is suitable for a large display panel.
[0003]
In such an organic EL panel, a transparent electrode having a predetermined pattern is formed on a predetermined portion of a translucent substrate which is a supporting substrate made of a glass material, and an insulating layer, a hole injection layer, and a hole transport layer are formed on the transparent electrode. Layer, a light emitting layer, and an electron transport layer are sequentially laminated to form an organic layer, an electron injection layer and a back electrode are laminated and formed on the organic layer to obtain an organic EL element, and the organic EL element is sealed on a sealing substrate. It is obtained by airtightly covering with.
[0004]
Such a method of manufacturing an organic EL panel includes a plurality of vapor deposition chambers corresponding to each part (a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a back electrode) constituting the organic EL element. The light-transmissive substrate is put into a vapor deposition apparatus having the vapor transmission temperature, and based on the production conditions such as the vapor deposition temperature and the film thickness of each layer set by a control device that controls each vapor deposition chamber provided in the vapor deposition apparatus, the light transmission is performed. The organic EL element is formed on a transparent substrate, and the light-transmitting substrate on which the organic EL element is formed is put into a sealing device, and the light-transmitting substrate and the organic EL element are covered so as to cover the organic EL element. It is common to obtain an organic EL panel by joining with a sealing substrate.
[0005]
As shown in FIG. 7, the sealing chamber B1 of the sealing device includes a mounting table 52 on which a sealing substrate 51 is mounted, and a light-transmitting substrate (an organic EL element is formed) provided via a substrate holder 53. And a lifting mechanism 56 for moving the mounting table 52 upward by driving means such as a cylinder. Further, in the sealing chamber B1, an ultraviolet lamp (hereinafter, referred to as a UV lamp) 57 for irradiating ultraviolet rays is used in order to join the translucent substrate 54 and the sealing substrate 51 via a UV-curable adhesive. It is arranged. The sealing chamber B <b> 1 raises the sealing substrate 51 by the raising mechanism 56 and brings the sealing substrate 51 into contact with the translucent substrate 54 while applying a predetermined pressure thereto. Is irradiated onto the UV-curable adhesive to seal both members with good airtightness.
[0006]
[Problems to be solved by the invention]
However, since the temperature difference between the translucent substrate 54 and the sealing substrate 51 in the sealing chamber B1 is large, the organic EL panel in which the sealing substrate 51 is joined to the translucent substrate 54 is taken out of the sealing device B1. When the temperature is returned to the normal temperature, the organic EL panel has a problem that it is curved. This is because the upper part in the sealing chamber B1 is closer to the UV lamp 57, so that the temperature is higher than the lower part, the temperature of the light-transmitting substrate 54 becomes higher than that of the sealing substrate 51, and the light-transmitting When the translucent substrate 54 and the sealing substrate 51 are joined in a state where the extension of the substrate 54 is larger than the sealing substrate 51, the organic EL panel is taken out of the sealing device B1, and the translucent substrate 54 and the sealing substrate 51 are removed. It is considered that the shrinkage of the translucent substrate 54 is larger than that of the sealing substrate 51 when the temperatures are equal. For example, when the temperature difference between the upper part and the lower part of the sealing chamber B1 is about 40 ° C., and the width W of the light-transmitting substrate is 400 mm, a curve having a height h of about 2 mm occurs (see FIG. 8). Such a curved organic EL panel has residual stress due to heat shrinkage, and may be damaged by a slight impact.
The present invention has been made in view of this problem, and provides a method of manufacturing an organic EL panel for manufacturing an organic EL panel having no curvature, and a sealing device used in the method of manufacturing the organic EL panel. .
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a sealing for hermetically covering the organic EL element. A method for manufacturing an organic EL panel, comprising a sealing step of bonding the sealing substrate with an intervening UV-curable adhesive, wherein the sealing step includes removing the sealing substrate at substantially the same temperature as the supporting substrate. It is formed by bonding to a supporting substrate.
[0008]
Further, the present invention provides a holding mechanism for holding a support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a mechanism for hermetically covering the organic EL element. A sealing device having a mounting table on which a sealing substrate is mounted, and joining the sealing substrate and the support substrate via an ultraviolet-curable adhesive, wherein the mounting table supports the sealing substrate. It has a heating means for heating to the same temperature state as the substrate.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0010]
1 and 2 show an example of an apparatus for manufacturing an organic EL panel according to the present invention. The organic EL panel manufacturing apparatus includes a vapor deposition apparatus A, a sealing apparatus B, a control apparatus C, a line terminal D, a light-transmitting substrate (supporting substrate) charging apparatus E, an adhesive coating apparatus F, and a sealing apparatus. It comprises a substrate input device G and a take-out device H.
[0011]
The vapor deposition apparatus A has first and second blocks a and b, and a vacuum state is secured in each of the blocks a and b. The first block a includes a pre-processing chamber a1 which is a plasma processing step, a first vapor deposition chamber a2 which is a hole injection layer forming step, a second vapor deposition chamber a3 which is a hole transport layer forming step, and a first block. Display form of the organic EL panel in the third vapor deposition chamber a4 which is the light emitting layer forming step, the fourth vapor deposition chamber a5 which is the second light emitting layer forming step, and the vapor deposition chambers a2, a3, a4 and a5 of the first block a. A first deposition mask storage chamber a6 for storing a deposition mask according to the above, and a loading chamber a7 connected to the translucent substrate loading device E for loading a translucent substrate as a support substrate into the deposition device A. have. The transfer of the translucent substrate between the rooms described above is performed using a transfer robot a8 that is rotatably provided by a driving unit such as a servomotor and that can move in the depth direction and the height direction of each room. In each of the vapor deposition chambers a2, a3, a4, a5, the pretreatment chamber a1, and the first vapor deposition mask storage chamber a6, an opening / closing door a9 for performing maintenance is provided.
[0012]
The second block b of the vapor deposition apparatus A includes a fifth vapor deposition chamber b1 as a third light emitting layer forming step, a sixth vapor deposition chamber b2 as a fourth light emitting layer forming step, and an eighth vapor chamber as an electron transport layer forming step. A vapor deposition chamber b3, a seventh vapor deposition chamber b4 for forming an electron injection layer, a ninth vapor deposition chamber b5 for forming a back electrode, and vapor deposition chambers b1, b2, b3, b4, b5 of the second block b. And a second vapor deposition mask storage room b6 for storing a vapor deposition mask corresponding to the display mode of the organic EL panel in (a). The transporting of the translucent substrate between the above-mentioned rooms is performed by a driving robot such as a servomotor, which is rotatably provided, and a transport robot b7 which can move in the depth direction and the height direction of each of the rooms is used. In each of the vapor deposition chambers b1, b2, b3, b4, b5 and the second vapor deposition mask storage chamber b6, an opening / closing door b8 for performing maintenance is provided.
[0013]
Further, between the first and second blocks a and b of the vapor deposition apparatus A, a first delivery room J for connecting the respective blocks a and b is provided. The first delivery chamber J is provided between the shutter mechanisms provided on the first block a side and the second block b side, and between the shutter mechanisms, respectively. And a slide mechanism for transporting the light-transmissive substrate to the block b side. The transmissive substrates are transferred by transport robots a8 and b7 provided in the blocks a and b, respectively.
[0014]
Here, the respective vapor deposition chambers (a2 to a5, b1 to b5) disposed in the first and second blocks a and b of the vapor deposition apparatus A will be described with reference to FIG. The vapor deposition chamber has a vacuum chamber 2 evacuated to a high vacuum by a vacuum pump (not shown) via an exhaust port 1. A crucible (Kununsen cell) 4 for accommodating the vapor deposition material 3 is provided below the vacuum chamber 2. A heating coil 5 is wound around the crucible 4, and the heating temperature of the heating coil 5 is controlled by the crucible 4. A heat shielding plate 6 for accurately transmitting the heat to the crucible 4 is provided so as to cover the outside of the crucible 4 and the heating coil 5. Further, the crucible 4 is provided with a temperature sensor 7 composed of a thermocouple or the like for detecting the temperature of the crucible 4. The temperature sensor 7 outputs deposition temperature data to a control device C for controlling the deposition temperature of each deposition chamber based on the production management information described later, and the control device C outputs the deposition temperature based on the production management information. Feedback control (current amount adjustment) is performed on the heating coil 5 so that the temperature of the crucible 4 becomes an appropriate temperature based on the production management information.
[0015]
On the other hand, on the upper side of the vacuum chamber 2, there is provided a light-transmitting substrate 8 made of a glass material for forming a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a back electrode. And a mask holder 11 having an evaporation mask 10 for forming a predetermined evaporation pattern on the translucent substrate 8 with respect to an evaporation source in which the crucible 4 is provided. A mechanism 12 is provided.
[0016]
In the vacuum chamber 2, a shutter 13 for controlling the thickness of each layer to be formed and a thickness gauge 14 for monitoring the thickness of the film are provided between the crucible 4 and the transparent substrate 8. Is done. Therefore, the control device C monitors the film formation region 15 with the film thickness meter 14 and performs a predetermined calculation based on the film formation data obtained by the film thickness meter 14. The film thickness to be formed is calculated, and the film thickness is managed by operating the shutter 13.
[0017]
Since the sealing device B joins the sealing substrate and the translucent substrate 8 via a UV-curable adhesive, a sealing chamber B1 for irradiating ultraviolet rays in a state where both members are overlapped, and a sealing chamber B1 for the organic EL panel. A UV irradiation mask storage room (second stock unit) B2 for storing an ultraviolet irradiation mask (hereinafter, referred to as a UV irradiation mask) according to a display mode, and an input unit for inputting a sealing substrate into the sealing device B. B3, a discharge section B4 connected to a take-out device H for carrying out the organic EL panel obtained through the sealing chamber B1 to the outside, and a sealing section provided between the adhesive coating apparatus F and the charging chamber B3. There is an adsorbent application chamber B5 for applying the adsorbent S to the substrate 23, and the inside of the sealing device B is filled with nitrogen.
[0018]
In the adsorbent application chamber B5, the adsorbent S is applied to the concave portion 23a of the sealing substrate 23 by applying means such as a dispenser. The application amount of the adsorbent S is desirably set according to the peripheral length of the concave portion 23a. For example, in the case of the cream-like adsorbent S, the amount is preferably 1.0 mg / cm or more. The peripheral length of the concave portion 23a is, for example, 2 · L + 2 · M when the horizontal width of the concave portion 23a is L and the vertical width is M (see FIG. 4).
[0019]
The transfer of the sealing substrate between the respective rooms of the sealing device B is provided rotatably by driving means such as a servomotor, and a transfer robot B6 which can move in the depth direction and the height direction of the respective rooms is used. . In the sealing room B1 and the UV irradiation mask storage room B2, a maintenance opening / closing door B7 is provided.
[0020]
Here, the sealing chamber B1 provided in the sealing device B will be described with reference to FIG. The sealing chamber B1 is evacuated by a vacuum pump (not shown) through an exhaust port 20 so that the inside of the chamber is in a substantially vacuum state, and nitrogen is introduced from a nitrogen inlet 21 so that the oxygen concentration is 100 ppm or less and a dew point. However, a nitrogen chamber 22 having a temperature of −70 ° C. or lower is provided. At a substantially center of the nitrogen chamber 22, a mounting table 24 for mounting a sealing substrate 23 made of a glass material for hermetically covering the organic EL element formed on the translucent substrate 8 is driven by a driving means such as a cylinder. A lifting mechanism 25 is provided for moving the upper part upward.
[0021]
The mounting table 24 is provided with a heater (heating means) 24 a composed of a heating wire or the like for heating the sealing substrate 23 to substantially the same temperature state as the translucent substrate 8. As shown in FIG. 6, the heater 24a is embedded in a meandering manner inside the mounting table 24, and a predetermined voltage is applied by a heater circuit 24b electrically connected to both ends of the heater 24a. The mounting table 24 is heated to approximately 60 to 70 ° C., which is almost the same as the vicinity of the translucent substrate 8. Since the temperature in the sealing chamber B1 is always constant, the voltage value applied to the heater 24a may be constant. However, a temperature sensor such as a thermistor is provided on the mounting table 24, and the temperature data output from the temperature sensor is provided. , The voltage applied to the heater 24a may be adjusted by feedback control.
[0022]
On the other hand, on the upper side of the nitrogen chamber 22, an ultraviolet irradiation device (hereinafter, referred to as a UV irradiation device) for irradiating ultraviolet light is used to join the translucent substrate 8 and the sealing substrate 23 via a UV curable adhesive. ) 26, and a UV irradiation mask 28 provided via a mask holder 27 and a translucent substrate (organic EL) provided via the substrate holder 9 below the UV irradiation device 26. A holding mechanism 29 is provided for holding the light-transmitting substrate (8) on which elements are formed. The UV irradiation device 26 is provided with a UV lamp 30 that irradiates ultraviolet rays and a shutter 31 that can block the ultraviolet rays. The control device C controls the ultraviolet rays from the UV lamp 30 by opening and closing the shutter 31. The time for irradiating the UV curable adhesive is controlled.
[0023]
The sealing chamber B1 raises the sealing substrate 23 by the lifting mechanism 25 and brings the sealing substrate 23 into contact with the translucent substrate 8 while applying a predetermined pressure thereto. The two members are hermetically sealed by irradiating the ultraviolet ray to the application position of the UV-curable adhesive through the UV irradiation mask 28.
[0024]
Between the second block b of the vapor deposition apparatus A and the sealing apparatus B, there is provided a second delivery chamber K connecting between the two apparatuses A and B. The second delivery chamber K is provided between the shutter mechanisms provided on the vapor deposition device A side and the sealing device B side, and between the respective shutter mechanisms, and moves the translucent substrate 8 from the vapor deposition device A to the sealing device B side. A transfer mechanism is provided, and the translucent substrate 8 is transferred by transfer robots b7 and B6 provided in both devices A and B, respectively.
[0025]
The control device C controls the vapor deposition device A and the sealing device B. The control device C controls the plasma processing of the pre-processing chamber a1 of the first block a of the vapor deposition apparatus A, and controls each of the vapor deposition chambers a2, a3, a4, a5 of the first block a and the second block b. Adjustment of deposition temperature in deposition chambers b1, b2, b3, b4, b5, adjustment of film thickness of film formation, drive control and sealing of each transfer robot a8, b7, B6 according to a transfer route determined according to production management information. It is a control means for performing a sealing process or the like in the sealing chamber B1 of the apparatus B, and for controlling the entire driving system in the vapor deposition apparatus A and the sealing apparatus B.
[0026]
The line terminal D includes a production quantity, a type of a deposition mask and a type of a UV irradiation mask based on the formation pattern of the organic EL element, the number of light-transmitting substrates 8 and the number of the sealing substrates 23 to be charged, and the respective deposition chambers a2 and a3, a4, a5, b1, b2, b3, b4, and b5, the deposition temperature (the temperature of the crucible in each deposition chamber), the thickness of each layer constituting the organic EL element, the type of the light emitting layer of the organic EL panel, and the like. Production management information such as production conditions relating to vapor deposition is set for each model of the organic EL panel, and the production management information is stored for each model, and is constituted by a personal computer, a sequencer, or the like. For example, a touch panel is provided for setting and displaying the production management information.
[0027]
The line terminal D is network-connected to a control device C, a light-transmissive substrate charging device E, a sealing substrate charging device G, and an adhesive coating device F. The control device C includes a model and a vapor deposition chamber associated with the model. Is transferred to the translucent substrate input device E, the sealing substrate input device G, and the adhesive application device F.
[0028]
The translucent substrate loading device E is for loading the translucent substrate 8 on which the transparent electrode and the insulating layer are formed into the vapor deposition device A based on the production management information transferred from the line terminal D, and performs cleaning. It has a plurality of blocks (rooms) for gradually bringing the translucent substrate 8 having undergone the process into a vacuum atmosphere via a conveying means such as a conveyor, and is connected to the input section a7 in the first block a of the vapor deposition apparatus A. Is done.
[0029]
The translucent substrate loading device E has an erroneous insertion determination function of determining whether the translucent substrate 8 to be loaded is an appropriate translucent substrate according to the model. The erroneous insertion determination function is performed by, for example, preparing a light-transmitting substrate 8 on which a predetermined determination pattern is formed, and performing a two-dimensional determination process on the determination pattern using a CCD camera. It is determined whether or not the substrate is a light-transmitting substrate of an appropriate model. If the substrate is erroneously input, the operation of inputting the substrate by the light-transmitting substrate insertion device E is stopped, and a warning of erroneous input is given to the production line To inform the workers.
[0030]
The sealing substrate loading device G is for loading the sealing substrate 23 after the cleaning process into the adhesive coating device F based on the production management information transferred from the line terminal D.
[0031]
The sealing substrate loading device G has an erroneous loading determining function of determining whether the loaded sealing substrate 23 is an appropriate sealing substrate 23 depending on the model. The erroneous insertion determination function is performed by, for example, preparing a sealing substrate 23 on which a predetermined determination pattern is formed and determining the code signal of the determination pattern using a transmission type line sensor. It is determined whether or not the sealing substrate 23 to be sealed is a sealing substrate 23 of an appropriate model. If the sealing substrate 23 is erroneously inserted, the substrate insertion operation by the sealing substrate insertion device G is stopped, and an erroneous insertion alarm is issued. This is issued to inform the production line worker.
[0032]
The adhesive application device F applies a UV-curable adhesive to the sealing substrate 23 based on the production management information transferred from the line terminal D. The adhesive application device F is, for example, a device in which a dispenser is attached to a robot that can move in the XYZ directions. The adhesive coating device F selects an appropriate coating pattern based on the model data transferred from the line terminal D, and applies the adhesive to the bonding surface of the sealing substrate 23 with the translucent substrate 8 by this coating turn. It is obtained by coating.
[0033]
The take-out device H is connected to the discharge section B4 of the sealing device B, and takes out the organic EL panel after the sealing step by a transporting means such as a conveyor.
[0034]
According to the method for manufacturing an organic EL panel described above, the mounting table 24 is heated by the heater 24 a provided on the mounting table 24, so that the temperature of the sealing substrate 23 in the sealing step is substantially equal to that of the translucent substrate 8. In the same manner, even when the organic EL panel is taken out of the sealing chamber B1, the sealing of the sealing substrate 23 and the translucent substrate 8 is equal, so that the bending of the organic EL panel does not occur.
[0035]
Since the organic EL panel manufactured according to the present embodiment has no residual stress due to heat shrinkage, there is no risk of breakage due to a slight impact as in the related art, and the design of a holder for holding the organic EL panel is not required. Therefore, there is an advantage that it is not necessary to consider the curvature of the organic EL panel.
[0036]
【The invention's effect】
According to the present invention, a support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a sealing substrate for hermetically covering the organic EL element are ultraviolet-cured. A method of manufacturing an organic EL panel including a sealing step of bonding via a mold adhesive, wherein the sealing step is performed by bonding the sealing substrate to the support substrate at substantially the same temperature as the support substrate. Since the temperature of the supporting substrate and the temperature of the sealing substrate in the sealing step are substantially the same, an organic EL panel having no curvature can be obtained.
[0037]
Further, the present invention provides a holding mechanism for holding a support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a mechanism for hermetically covering the organic EL element. A sealing device having a mounting table on which a sealing substrate is mounted, and joining the sealing substrate and the support substrate via an ultraviolet-curable adhesive, wherein the mounting table supports the sealing substrate. It has a heating means for heating the substrate to substantially the same temperature as the substrate. Since the temperature of the supporting substrate and the temperature of the sealing substrate in the sealing step are substantially the same, an organic EL panel having no curvature can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an apparatus for manufacturing an organic EL panel according to an embodiment of the present invention.
FIG. 2 is a diagram showing an apparatus for manufacturing an organic EL panel according to the embodiment.
FIG. 3 is a diagram illustrating a vapor deposition chamber in the vapor deposition device of the embodiment.
FIG. 4 is a perspective view of the sealing substrate of the embodiment.
FIG. 5 is a diagram illustrating a sealing chamber in the sealing device of the embodiment.
FIG. 6 is a front view of the mounting table of the embodiment.
FIG. 7 is a schematic view of a sealing device showing a conventional example.
FIG. 8 is a side view of the organic EL panel showing the conventional example.
[Explanation of symbols]
B sealing device B1 sealing chamber 8 translucent substrate (support substrate)
23 sealing substrate 24 mounting table 29 holding mechanism

Claims (2)

少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板と、前記有機EL素子を気密的に覆うための封止基板とを紫外線硬化型接着剤を介し接合する封止工程を含む有機ELパネルの製造方法であって、
前記封止工程は、前記支持基板と略同じ温度状態で前記封止基板を前記支持基板に接合してなることを特徴とする有機ELパネルの製造方法。
A support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a sealing substrate for hermetically covering the organic EL element are sandwiched by an ultraviolet curable adhesive. A method of manufacturing an organic EL panel including a sealing step of joining,
The method of manufacturing an organic EL panel, wherein the sealing step comprises joining the sealing substrate to the support substrate at substantially the same temperature as the support substrate.
少なくとも発光層を含む有機層を一対の電極により狭持してなる有機EL素子を形成する支持基板を保持する保持機構と、前記有機EL素子を気密的に覆うための前記封止基板を載せる載置台とを有し、紫外線硬化型接着剤を介し前記封止基板と前記支持基板とを接合する封止装置であって、
前記載置台に前記封止基板を前記支持基板と略同じ温度状態に加熱する加熱手段を設けたことを特徴とする封止装置。
A holding mechanism for holding a support substrate for forming an organic EL element in which an organic layer including at least a light emitting layer is sandwiched between a pair of electrodes, and a mounting for mounting the sealing substrate for hermetically covering the organic EL element A mounting device having a mounting table and joining the sealing substrate and the support substrate via an ultraviolet-curable adhesive,
A sealing device, wherein the mounting table is provided with heating means for heating the sealing substrate to substantially the same temperature as the supporting substrate.
JP2002240359A 2002-08-21 2002-08-21 Manufacturing method of organic el panel and sealing device used in manufacturing method of organic el panel Pending JP2004079409A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010250008A (en) * 2009-04-14 2010-11-04 Joyo Kogaku Kk Sealing device
JP2011040182A (en) * 2009-08-07 2011-02-24 Mitsubishi Heavy Ind Ltd Manufacturing device of organic light-emitting panel and method for manufacturing organic light-emitting panel
JP2011243466A (en) * 2010-05-20 2011-12-01 Nippon Seiki Co Ltd Sealing method and apparatus for organic el panel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010250008A (en) * 2009-04-14 2010-11-04 Joyo Kogaku Kk Sealing device
JP2011040182A (en) * 2009-08-07 2011-02-24 Mitsubishi Heavy Ind Ltd Manufacturing device of organic light-emitting panel and method for manufacturing organic light-emitting panel
JP2011243466A (en) * 2010-05-20 2011-12-01 Nippon Seiki Co Ltd Sealing method and apparatus for organic el panel

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