JP7398934B2 - 表示装置用支持基板、有機el表示装置、および有機el表示装置の製造方法 - Google Patents
表示装置用支持基板、有機el表示装置、および有機el表示装置の製造方法 Download PDFInfo
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- JP7398934B2 JP7398934B2 JP2019211567A JP2019211567A JP7398934B2 JP 7398934 B2 JP7398934 B2 JP 7398934B2 JP 2019211567 A JP2019211567 A JP 2019211567A JP 2019211567 A JP2019211567 A JP 2019211567A JP 7398934 B2 JP7398934 B2 JP 7398934B2
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- display device
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- polyimide resin
- dianhydride
- organic
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Images
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- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
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Description
10~150μmの厚さのTFTガラス基板と、
前記TFTガラス基板に接して設けられた150nm以下の厚さのポリイミド樹脂層と、
を含むことを特徴にする。
本発明の表示装置用支持基板は、
10~150μmの厚さのTFTガラス基板と、
前記TFTガラス基板に接して設けられた150nm以下の厚さのポリイミド樹脂層と、
を含むことに特徴がある。
本発明の表示装置用支持基板は、10~150μmの厚さのTFTガラス基板を含む。
本発明の表示装置用支持基板は、TFTガラス基板に接して設けられた150nm以下の厚さのポリイミド樹脂層を含む。ポリイミド樹脂層は、TFTガラス基板のTFT回路層が形成されない面に接して設けられる。
本発明はまた、上記で説明した本発明の表示装置用支持基板を備える有機EL表示装置にも関する。
本発明はまた、有機EL表示装置を製造する方法にも関する。本発明の有機EL表示装置を製造する方法は、ガラス基板上に20~150nmの厚さのポリイミド樹脂層を形成する工程と、前記ポリイミド樹脂層上に10~150μmの厚さのTFTガラス基板を設ける工程と、前記TFTガラス基板にTFT回路層を形成する工程と、前記TFT回路層上に発光層を設ける工程と、前記発光層を封止層により封止する工程とを含み、前記ポリイミド樹脂層にレーザー光を照射することにより、前記ポリイミド樹脂を前記ガラス基板から剥離する工程を含むことを特徴にする。
0.5mm厚のガラス基板上に酸二無水物として4、4’-オキシジフタル酸無水物(ODPA)およびジアミンとして2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)を含むワニスをスロットダイで500nmの厚さで塗布し、窒素オーブン(光洋サーモシステム社製)に投入し、50℃で30分間乾燥させた後、100℃で30分間乾燥させ、150℃で30分間乾燥させ、200℃で30分間乾燥させ、250℃で30分間乾燥させ、300℃で30分間乾燥させ、350℃で30分間硬化させて厚さ100nmのポリイミド樹脂層を形成した。次いで、ポリイミド樹脂層上にTFTガラス基板としての厚さ50μmの薄層ガラス(日本電気硝子社製)を積層し、350℃で10分間加熱してポリイミド樹脂層とTFTガラス基板としての薄層ガラスを接着した。次いで、この薄層ガラス上に公知の方法でTFT回路層と発光層を形成し、さらに発光層上に封止層を形成してガラス基板上に表示装置を形成した。TFT回路層を形成する工程において、半導体層を450℃で2時間アニーリングした。最後に、ガラス基板の表示装置が積層されている面と反対の面からレーザーリフトオフ法により波長308nmのレーザー光をポリイミド樹脂層に照射して、ポリイミド樹脂層をガラス基板から剥離し、有機EL表示装置を得た。得られた有機EL表示装置のポリイミド樹脂層の厚さを断面TEM観察により測定したところ、70nmであった。
上記実施例のポリイミド樹脂層の代わりに一般的なエポキシ樹脂層を用い、エポキシ樹脂層に薄層ガラスを積層した後、160℃で10分間加熱したこと以外は実施例と同様にして有機EL表示装置の製造を行ったが、TFT回路層を形成する工程において、半導体層を450℃で2時間アニーリングした際にエポキシ樹脂層が発泡してエポキシ樹脂層と薄層ガラスが剥離してしまい、有機EL表示装置を製造することができなかった。
(可視光透過試験)
得られた実施例1の有機EL表示装置の可視光に対する透過度を可視光透過測定器(日本分光社製、UV-500)で測定した。実施例1の有機EL表示装置は、可視光領域の全光線透過率が、90%以上であった。そのため、本発明の有機EL表示装置は、透明性に優れるものであった。
Claims (6)
- 10~150μmの厚さのTFTガラス基板と、
前記TFTガラス基板に接して設けられた150nm以下の厚さのポリイミド樹脂層と、
を含み、
前記ポリイミド樹脂層が、酸二無水物として4、4’-オキシジフタル酸無水物(ODPA)、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物(BPDA)、2,2-ビス(4-(3,4-ジカルボキシフェノキシ)フェニル)プロパン二無水物(BSAA)、4,4’-(ヘキサフルオロイソプロピリデン)ジフタル酸無水物(6FDA)、または1,2,3,4-シクロブタンテトラカルボン酸二無水物(CBDA)を含み、ジアミンとして2,2-ビス[3-(3-アミノベンズアミド)-4-ヒドロキシフェニル]ヘキサフルオロプロパン(HFHA)、trans-1,4-ジアミノシクロへキサン、または2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)を含む、ポリイミド樹脂で形成されることを特徴とする、有機EL表示装置用支持基板。 - 前記ポリイミド樹脂層の厚さが0.1nm以上である、請求項1に記載の表示装置用支持基板。
- 前記ポリイミド樹脂層の厚さが100nm以下である、請求項1又は2に記載の表示装置用支持基板。
- 前記TFTガラス基板の厚さが30~100μmである、請求項1~3のいずれか一項に記載の表示装置用支持基板。
- 請求項1~4のいずれか一項に記載の有機EL表示装置用支持基板を備える、有機EL表示装置。
- ガラス基板上に20~150nmの厚さのポリイミド樹脂層を設ける工程と、
前記ポリイミド樹脂層上に10~150μmの厚さのTFTガラス基板を設ける工程と、
前記TFTガラス基板にTFT回路層を形成する工程と、
前記TFT回路層上に有機層を含む発光層を設ける工程と、
前記発光層を封止層により封止する工程と、
を含む、有機EL表示装置を製造する方法であって、
前記ポリイミド樹脂層にレーザー光を照射することにより、前記ポリイミド樹脂層を前記ガラス基板から剥離する工程を含み、
前記ポリイミド樹脂層が、酸二無水物として4、4’-オキシジフタル酸無水物(ODPA)、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物(BPDA)、2,2-ビス(4-(3,4-ジカルボキシフェノキシ)フェニル)プロパン二無水物(BSAA)、4,4’-(ヘキサフルオロイソプロピリデン)ジフタル酸無水物(6FDA)、または1,2,3,4-シクロブタンテトラカルボン酸二無水物(CBDA)を含み、ジアミンとして2,2-ビス[3-(3-アミノベンズアミド)-4-ヒドロキシフェニル]ヘキサフルオロプロパン(HFHA)、trans-1,4-ジアミノシクロへキサン、または2,2’-ビス(トリフルオロメチル)ベンジジン(TFMB)を含む、ポリイミド樹脂で形成される、方法。
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