JP2021532003A - フレキシブルディスプレイ装置のカバーウィンドウおよびディスプレイ装置 - Google Patents
フレキシブルディスプレイ装置のカバーウィンドウおよびディスプレイ装置 Download PDFInfo
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- JP2021532003A JP2021532003A JP2021502829A JP2021502829A JP2021532003A JP 2021532003 A JP2021532003 A JP 2021532003A JP 2021502829 A JP2021502829 A JP 2021502829A JP 2021502829 A JP2021502829 A JP 2021502829A JP 2021532003 A JP2021532003 A JP 2021532003A
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Abstract
Description
また、本発明は、前記カバーウィンドウを含むフレキシブルディスプレイ装置を提供する。
また、前記ハードコート層は、前記バインダー樹脂に分散した微細無機粒子を含むことができる。
前記微細無機粒子は、100nm以下、または5〜100nmの平均半径を有することができる。
製造例1−1
3官能アクリレート系化合物のトリメチロールプロパントリアクリレート(TMPTA、製造会社:Cytec、Mw=296g/mol、アクリレート基当量=99g/mol)20g、9官能ウレタンアクリレート系化合物のMU9800(製造会社:MIWON、Mw=3500g/mol、アクリレート基当量=389g/mol)30g、10官能のウレタンアクリレート系化合物のMU9020(製造会社:MIWON、Mw=4500g/mol、アクリレート基当量=450g/mol)50g、光開始剤Irgacure184(製造会社:Ciba)1g、メチルエチルケトン(MEK)10gを混合して、アクリレート溶液を製造した。
3官能アクリレート系化合物のトリメチロールプロパントリアクリレート(TMPTA、製造会社:Cytec、Mw=296g/mol、アクリレート基当量=99g/mol)20g、9官能ウレタンアクリレート系化合物のMU9800(製造会社:MIWON、Mw=3500g/mol、アクリレート基当量=389g/mol)30g、10官能のウレタンアクリレート系化合物のMU9020(製造会社:MIWON、Mw=4500g/mol、アクリレート基当量=450g/mol)30g、アクリレート系高分子化合物のSMP−250AP(Acrylic polymer、製造会社:共栄社、アクリレート基当量=240〜260g/mol、重量平均分子量:37,000)がプロピレングリコールモノメチルエーテル(Propylene glycol monomethyl ether)に50重量%溶解しているバインダー溶液40g、光開始剤Irgacure184(製造会社:Ciba)1g、メチルエチルケトン(MEK)20gを混合して、アクリレート溶液を製造した。
下記表1のように使用した成分の含有量などを調節した点を除けば、製造例1−1と同様の方法でハードコート層形成用コーティング液を製造した。
9官能のウレタンアクリレート系化合物のMU9800(製造会社:MIWON、Mw=3500g/mol、アクリレート基当量=389g/mol)40g、10官能のウレタン化合物のMU9020(製造会社:MIWON、Mw=4500g/mol、アクリレート基当量=450g/mol)40g、3官能のウレタンアクリレート系化合物のPU340(製造会社:MIWON、Mw=2400g/mol、アクリレート基当量=800g/mol)20g、光開始剤Irgacure184(製造会社:Ciba)1g、メチルエチルケトン(MEK)10gを混合して、アクリレート溶液を製造した。
50μmの厚さのポリイミド基材(12.5mm/minのストレイン速度基準の弾性モジュラス−表2に記載)の両面に、それぞれ下記表2に記載のハードコート層形成用コーティング液をバーコーティング方式で塗布し、90℃で2分間、Air雰囲気下で乾燥した。290〜320nmの波長のメタルハライドランプ(光量:200mJ/cm2)で光硬化して光学積層体を製造した。硬化が完了した後、両面に形成されたコーティング層の厚さはそれぞれ10μmであった。
実験例1:鉛筆硬度
実施例および比較例それぞれのカバーウィンドウにおいて前面に形成されたハードコート層に対して、鉛筆硬度測定器を用いて、測定標準JIS K5400−5−4により、750gの荷重、45度の角度で3回往復した後、キズのない最大硬度を確認した。
実施例および比較例それぞれのカバーウィンドウに対して、分光光度計(機器名:COH−400)を用いて透過率およびヘイズを測定した。
測定標準JIS K5600−5−1の方法により、実施例および比較例それぞれのカバーウィンドウに対して、多様な直径の円筒形マンドレルに挟んで巻いた後、クラックの発生しない最小直径を測定した。
実施例および比較例それぞれのカバーウインドウにおいて前面に形成されたハードコート層の全面に対して、カッターナイフを用いて、1cm×1cm〜2cm×2cmの大きさ内に100個の格子ができるように切り込みを入れて、Nichiban Tape(CT−24)を用いて付着後、剥離テストを行う。同一面に対して2回剥離テストを行って、剥離された水準に応じて、5B(剥離なし)の水準から0B(全面剥離)までの付着力評価をする(5Bまで良好)。
−4B(剥離された部分が含まれている格子が1〜5個)
−3B(剥離された部分が含まれている格子が6〜15個)
−2B(剥離された部分が含まれている格子が16〜35個)
−1B(剥離された部分が含まれている格子が36〜50個)
−0B(剥離された部分が含まれている格子が51個以上)
実施例および比較例それぞれのカバーウィンドウにおいて前面に形成されたハードコート層に対して、スチールウール(#0000)に荷重500gfをかけて、30rpmの速度で500回往復して、ハードコートフィルムの表面を測定する。肉眼で観察される1cm以下のスクラッチが1個以下観察されると良好と判定した。
図1は、本発明の一実施例によるフィルムに対して、曲げ耐久性および曲げ安定性テストを実施する方法を概略的に示す図である。
(1)フレキシブルディスプレイ装置のカバーウィンドウのモジュラスの測定
Universal Testing Systems(Instron(登録商標) 3360)を用いて、ISO527−3によりフィルムのモジュラスを測定した。実施例および比較例の各フィルムに対して裁断するものの、エッジ(edge)部位の微細クラックを最小化するように、10x150mmの大きさにレーザ裁断した。測定装置(Instron(登録商標) 3360)にレーザ裁断されたフィルムの端を固定させた後、12.5mm/minのストレイン速度(Strain rate)で引張(Tensile)方向に試験片が破断する時まで測定した。
Nano Indentation System(MTS Nanoindenter XP)を用いて、ISO14577−1により第1ハードコート層のモジュラスを測定した。より具体的には、50nmのベルコビッチインデンターチップ(Berkovich Indenter Tip)を用いて、第1ハードコート層の表面から45mNの力(Load)を加えて、400μmの深さまで0.05/sの変形速度(Strain rate)で測定した。
Claims (15)
- 光透過性基材;および前記光透過性基材の両面にそれぞれ形成された第1ハードコート層および第2ハードコート層;を含む積層体を備え、
前記積層体の全体のモジュラスに対する前記第1ハードコート層のモジュラスの比率が1.5〜2.0であり、
前記第1ハードコート層側で測定した表面の鉛筆硬度が750g基準5H以上である、
フレキシブルディスプレイ装置のカバーウィンドウ。 - 前記積層体の全体のモジュラスは、ISO527−3により、12.5mm/minのストレイン速度(Strain rate)を適用して測定した結果であり、
前記第1ハードコート層のモジュラスは、ISO14577−1により、45mNのターゲットロード(target load)を適用し、前記第1ハードコート層側の一面から400μmのターゲット深さ(Target depth)を適用して、0.05/sの変形速度(Strain rate)で測定した結果である、
請求項1に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 前記積層体の全体のモジュラスに対する前記第1ハードコート層のモジュラスの比率が1.750〜1.950である、請求項1または2に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 前記積層体の全体のモジュラスが5.5〜6.5GPaであり、
前記第1ハードコート層のモジュラスが10.0〜12.0GPaである、請求項1から3の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 前記光透過性基材は、5〜100μmの厚さを有し、
前記第1、第2ハードコート層は、それぞれ1〜20μmの厚さを有する、請求項1から4の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 12.5mm/minのストレイン速度(Strain rate)を適用して測定した前記光透過性基材の弾性モジュラス(Elastic Modulus)が5GPa以上である、請求項1から5の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 前記光透過性基材は、ポリイミド、ポリアミドおよびポリアミドイミドからなる群より選択された1種以上の高分子を含む、請求項1から6の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 25℃の温度で直径2mmの棒を中心に行った10万回の曲げ耐久性テストでクラックが発生しない、請求項1から7の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 550nmの波長領域の光に対して90.0%以上の透過率を有し、1.00%以下のヘイズ値を有する、請求項1から8の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 前記第1ハードコート層は、6官能以下の(メタ)アクリレート化合物および8官能以上の(メタ)アクリレート化合物を含む単量体混合物の硬化物を含むバインダー樹脂と、前記バインダー樹脂に分散した微細無機粒子とを含み、
前記6官能以下の(メタ)アクリレート化合物:8官能以上の(メタ)アクリレート化合物の重量比は1:2〜1:10である、
請求項1から9の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 前記第2ハードコート層は、(メタ)アクリレート化合物由来のバインダー樹脂と、前記バインダー樹脂に分散した微細無機粒子とを含み、
前記積層体の全体のモジュラスに対する前記第2ハードコート層のモジュラスの比率が1.400〜1.800である、請求項1から10の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 前記積層体の全体のモジュラスに対する前記第1ハードコート層のモジュラスの比率(R1)が、前記積層体の全体のモジュラスに対する前記第2ハードコート層のモジュラスの比率(R2)より0.1000以上大きい、請求項11に記載のフレキシブルディスプレイ装置のカバーウィンドウ。
- 前記第1ハードコート層に含まれるバインダー樹脂は、1万〜20万の重量平均分子量を有する(メタ)アクリル系高分子および単量体混合物から形成された共重合体をさらに含む、
請求項10から12の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 前記第1ハードコート層は、前記バインダー樹脂100重量部に対して、前記微細無機粒子50〜80重量部を含み、
前記第2ハードコート層は、前記バインダー樹脂100重量部に対して、前記微細無機粒子50〜80重量部を含む、
請求項10から13の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウ。 - 請求項1から14の何れか一項に記載のフレキシブルディスプレイ装置のカバーウィンドウを含むフレキシブルディスプレイ装置。
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