JP2019029659A - 導電性基板、電子装置及び表示装置の製造方法 - Google Patents
導電性基板、電子装置及び表示装置の製造方法 Download PDFInfo
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- JP2019029659A JP2019029659A JP2018133396A JP2018133396A JP2019029659A JP 2019029659 A JP2019029659 A JP 2019029659A JP 2018133396 A JP2018133396 A JP 2018133396A JP 2018133396 A JP2018133396 A JP 2018133396A JP 2019029659 A JP2019029659 A JP 2019029659A
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Abstract
【解決手段】基材2及び基材2の一方の主面側に設けられた導電パターンを有する導電性基板1を製造する方法が開示される。当該方法は、インプリント法により、下地層が露出した底面6aとトレンチ形成層の表面を含む側面6b,6cを有するトレンチ6を形成させる工程と、トレンチ6の底面6aに露出した下地層3から金属めっきを成長させ、それによって導電パターン層8を形成させる工程と、を備える。
【選択図】図1
Description
図1は、第1実施形態に係る導電性基板1Aを製造する方法を模式的に示す断面図である。本実施形態に係る方法では、まず、図1の(a)に示すように、フィルム状の基材2の一方の主面2a上に、触媒を含有する下地層3を形成させる。図1の(a)の工程は、基材2及び基材2上に形成された下地層3を備えた積層体を用意する工程であってもよい。
図3は、第2実施形態に係る導電性基板1Bを製造する方法を模式的に示す断面図である。図1の第1実施形態に係る方法と対応する構成および部分については同一の符号を付し、重複する説明を省略することがある。
以上の方法によって製造された導電性基板に発光素子を実装することによって、当該導電性基板及び発光素子を備える表示装置を製造することができる。上述の導電性基板は、下地層からの導電パターン層の剥がれが抑制されるため、この導電性基板を備える表示装置は、布又は紙のように薄く製造され、折り曲げたり丸めたりできるフレキシブルな表示装置(ディスプレイ)として使用することができる。このようなフレキシブルな表示装置は、小型化・軽量化することができ、収納性・デザイン性を向上させることができる。
他の実施形態において、上述した方法によって製造された導電性基板には、発光素子以外の電子部品を実装することもできる。発光素子以外の電子部品としては、例えば、コンデンサ、インダクタ、サーミスタ等の受動部品、半導体素子、コネクタ等が挙げられる。これにより、表示装置以外にも、上述した方法によって製造された導電性基板上に電子部品を備える電子装置を製造することができる。
20質量%のPd粒子と、イソシアネート樹脂とを含有する、下地層形成用の触媒含有樹脂を準備した。この触媒含有樹脂を、透明基材であるPETフィルム(厚み100μm)上に、バーコーターを用いて塗工した。塗膜を80℃に加熱し、硬化させることにより、下地層(厚み100nm)を形成させた。その後、下地層上に、バーコーターを用いて、紫外線硬化性の透明アクリル系オリゴマーを塗工してトレンチ形成層(厚み2μm)を形成した。
導電パターン層の幅W(トレンチの幅)及びの導電パターン層の厚み(トレンチの深さ)を表1に記載の値に変更したこと以外は、実施例1と同様の方法により導電性基板を作製した。
導電パターン層の厚み(トレンチの深さ)を表1に記載した値に変更したこと以外は、実施例1と同様の方法により導電性基板を作製した。
図8に示す従来の製造方法に従って、下地層を備えていない導電性基板を作製した。まず、実施例と同様のPETフィルム(基材2)に紫外線硬化性の透明アクリル系オリゴマーを塗工し、トレンチ形成層4(厚み2μm)を形成した。トレンチ形成層4に、メッシュ状のパターンを形成している幅1μmの凸部を有するモールドを押し付け、凸部の先端を基材2まで到達させた。この状態で、トレンチ形成層4を紫外線照射によって硬化させることによって、基材2が露出した底面を有するトレンチ6が形成された積層体5Cを得た(図8の(a))。次に、スパッタ法により、トレンチ形成層4の表面4a及び底面6aの全体を覆うCuからなるシード層11を形成させた(図8(b))。その後、積層体5Cを硫酸銅及びホルマリンを含有する無電解めっき液に浸漬することでシード層11からCuめっきを成長させて、トレンチ6を充填するとともにトレンチ形成層4の全体を覆うCuめっき層8Aを形成させた(図8の(c))。その後、Cuめっき層8Aのうち、トレンチ6内部を充填する部分以外の部分をエッチングによって除去し(図8(d))、導電パターン層8を有する比較例1に係る導電性基板1Cを作製した。得られた導電性基板に対して、クロスセクションポリッシャーを用いて、導電パターン層の断面を切り出し、走査型電子顕微鏡を用いた観察により、導電パターン層8と、トレンチ6の側面6b,6cとは密着し、これらの間に間隙が形成されていないことを確認した。
長さ150mm、幅50mmの各導電性基板のサンプルを準備した。このサンプルを、図9に示す耐屈曲性試験機を用いた、JISC5016に従う屈曲試験に供した。すなわち、導電性基板1の端部12を固定部13に固定しながら、導電性基板1を屈曲部14の円形の周面(曲率半径d:5mm)に沿わせることで、導電性基板1が屈曲するように配置した。その後、端部12とは反対側の端部15を矢印Bに示す方向に沿って往復させた。往復の移動距離を30mm、往復の周期を150回/分とし、1分間、端部15を繰り返し往復させた。
非接触式抵抗測定器EC−80P(ナプソン(株))を用いて、屈曲試験前後の導電性基板のそれぞれについて表面抵抗を測定した。測定は、導電性基板の表面φ20mmの領域について行った。測定結果に基づいて、以下の4段階のランクで導電性を評価した。ランクAである場合に、最も導電性が優れているといえる。
ランクA:表面抵抗が5Ω/□未満
ランクB:表面抵抗が5Ω/□以上10Ω/□未満
ランクC:表面抵抗が10Ω/□以上15Ω/□未満
ランクD:表面抵抗が15Ω/□以上
屈曲試験後の導電性基板の断面を走査型電子顕微鏡で観察して、下地層又は基材からの導電パターン層の剥がれの有無を確認した。
導電性基板の全光線透過率を、ヘーズメーターNDH5000(日本電色工業(株))を用い、JISK7136に従って測定した。測定結果に対して以下の3段階のランクに基づき透明導電性基板の透明性を評価した。ランクAである場合、最も透明性が優れているといえる。
ランクA:導電性基板の全光線透過率/基材の全光線透過率×100=98%以上
ランクB:導電性基板の全光線透過率/基材の全光線透過率×100=96%以上98%未満
ランクC:導電性基板の全光線透過率/基材の全光線透過率×100=96%未満
実施例1と同様にして、複数の導電性基板を作製した。これらを、Pdを含む水溶液に5分間浸漬させてから純水で洗浄し、導電パターン層の表面に、触媒としてのPd粒子を吸着させた。その後、導電性基板を黒色Niめっき用の無電解めっき液に3分間浸漬させて、導電パターン層のトレンチの底面とは反対側及びトレンチの側面側の再表層として、黒色Niめっき膜を形成した。無電解めっき液から取り出した各導電性基板を純水で洗浄した。さらに、黒色Niめっき膜に酸処理を行い、黒色Niめっき膜の表面粗さRaを、酸処理の時間を調整することにより15nm(実施例10)、58nm(実施例11)又は65nm(実施例12)に調整した。Raは、走査型プローブ顕微鏡を用いて、1μmの視野において測定した。実施例1の導電パターン層のRaは8nmであった。
実施例10〜12及び実施例1の導電性基板について、上述した方法と同様の方法により、透明性及び導電性を評価した。表2に示すように、Raが15〜60nmであるときに、透明性及び導電性が特に優れることがわかった。
実施例1と同様にして、複数の導電性基板を作製した。これら導電性基板のトレンチ形成層及び導電パターン層の表面に、保護膜形成用の硬化性樹脂組成物をドクターブレードで塗工した。塗膜を乾燥してから、紫外線照射によって硬化させて、トレンチ形成層及び導電パターンを覆う保護膜(厚み100nm)を形成させた。ここで用いた保護膜形成用の硬化性樹脂組成物は、フィラー(酸化ケイ素)及びフッ素樹脂を含有する。フィラーの含有量を変更することにより、保護膜の屈折率が表3に記載した値になるように調整した。
実施例13〜15及び実施例1の導電性基板について、上述した方法と同様の方法により、導電性基板の透明性を測定した。結果を表3に示す。表3に示すように、保護膜の屈折率が空気の屈折率1.0より大きく、また、トレンチ形成層の屈折率よりも小さい場合に、透明性が特に優れることがわかった。
Claims (15)
- 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程であって、前記下地層が触媒を含む、工程と、
前記トレンチの底面に露出した前記下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、を備える、方法。 - 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程と、
前記トレンチの底面に露出した前記下地層に触媒を吸着させる工程と、
前記触媒が吸着した下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、を備える、方法。 - 前記導電パターン層の側面のうち少なくとも一部と前記トレンチの側面との間に間隙が形成されるように、前記金属めっきを成長させる、請求項1又は2に記載の方法。
- 前記導電パターン層の、前記トレンチの底面とは反対側の面を含む表面を黒化させる工程を更に備える、請求項1〜3のいずれか一項に記載の方法。
- 前記トレンチ形成層及び前記導電パターン層の前記基材とは反対側の面の少なくとも一部を覆う保護膜を形成させる工程を更に備える、請求項1〜4のいずれか一項に記載の方法。
- 前記導電パターン層がメッシュ状のパターンを形成している、請求項1〜5のいずれか一項に記載の方法。
- 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板と、電子部品とを備える電子装置を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程であって、前記下地層が触媒を含む、工程と、
前記トレンチの底面に露出した前記下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、
前記基板及び前記導電パターン層を有する前記導電性基板に前記電子部品を実装する工程と、を備える、方法。 - 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板と、電子部品とを備える電子装置を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程と、
前記トレンチの底面に露出した前記下地層に触媒を吸着させる工程と、
前記触媒が吸着した下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、
前記基板及び前記導電パターン層を有する前記導電性基板に前記電子部品を実装する工程と、を備える、方法。 - 前記導電性基板に前記電子部品を実装する工程が、
前記導電パターン層上に接続部を形成させることと、
前記電子部品を、前記接続部を介して前記導電パターン層と接続することと、を含む、請求項7又は8に記載の方法。 - 前記導電性基板に前記電子部品を実装する工程が、
前記導電パターン層上に密着層を形成させることと、
前記トレンチ形成層の前記下地層とは反対側の表面を覆い、前記密着層の一部が露出する開口部を有する絶縁層を形成させることと、
前記密着層の開口部内に露出した前記密着層の面上にUBM層を形成させることと、
前記UBM層上に接続部を形成させることと、
前記電子部品を、前記接続部、前記UBM層及び前記密着層を介して前記導電パターン層と接続することと、を含む、請求項7又は8に記載の方法。 - 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板と、発光素子とを備える表示装置を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程であって、前記下地層が触媒を含む、工程と、
前記トレンチの底面に露出した前記下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、
前記基板及び前記導電パターン層を有する前記導電性基板に前記発光素子を実装する工程と、を備える、方法。 - 基材及び前記基材の一方の主面側に設けられた導電パターン層を有する導電性基板と、発光素子とを備える表示装置を製造する方法であって、
前記基材上に形成された下地層上に形成されたトレンチ形成層に凸部を有するモールドを押し込むことを含むインプリント法により、前記下地層が露出した底面と前記トレンチ形成層の表面を含む側面とを有するトレンチを形成させる工程と、
前記トレンチの底面に露出した前記下地層に触媒を吸着させる工程と、
前記触媒が吸着した下地層から金属めっきを成長させ、それにより前記金属めっきを含み前記トレンチを充填する前記導電パターン層を形成させる工程と、
前記基板及び前記導電パターン層を有する前記導電性基板に前記発光素子を実装する工程と、を備える、方法。 - 前記導電性基板に前記発光素子を実装する工程が、
前記導電パターン層上に接続部を形成させることと、
前記発光素子を、前記接続部を介して前記導電パターン層と接続することと、を含む、請求項11又は12に記載の方法。 - 前記導電性基板に前記発光素子を実装する工程が、
前記導電パターン層上に密着層を形成させることと、
前記トレンチ形成層の前記下地層とは反対側の表面を覆い、前記密着層の一部が露出する開口部を有する絶縁層を形成させることと、
前記密着層の開口部内に露出した前記密着層の面上にUBM層を形成させることと、
前記UBM層上に接続部を形成させることと、
前記発光素子を、前記接続部、前記UBM層及び前記密着層を介して前記導電パターン層と接続することと、を含む、請求項11又は12に記載の方法。 - 前記導電パターン層の側面のうち少なくとも一部と前記トレンチの側面との間に間隙が形成されるように、前記金属めっきを成長させる、請求項7〜14のいずれか一項に記載の方法。
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JP2023112114A (ja) | 2023-08-10 |
DE102018118116A1 (de) | 2019-04-04 |
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US20200381266A1 (en) | 2020-12-03 |
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JP7375294B2 (ja) | 2023-11-08 |
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US11410855B2 (en) | 2022-08-09 |
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