JP2021066882A - ポリエステルフィルムおよびこれを含むフレキシブルディスプレイ装置 - Google Patents
ポリエステルフィルムおよびこれを含むフレキシブルディスプレイ装置 Download PDFInfo
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- JP2021066882A JP2021066882A JP2020178203A JP2020178203A JP2021066882A JP 2021066882 A JP2021066882 A JP 2021066882A JP 2020178203 A JP2020178203 A JP 2020178203A JP 2020178203 A JP2020178203 A JP 2020178203A JP 2021066882 A JP2021066882 A JP 2021066882A
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- Prior art keywords
- polyester film
- stress
- strain
- film
- flexible display
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Images
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Abstract
Description
一実現例によるポリエステルフィルムは、応力-ひずみ曲線(stress-strain curve)においてひずみ率が2%〜3%の区間における決定係数(R2)が0.985以上で、結晶化度が55%以上である。
前記ポリエステルフィルムは、任意の方向に引っ張る際、特定のひずみ率区間において、応力に対するひずみ率(すなわち引張ひずみ率)の決定係数(R2)値が特定の範囲を有する。これにより、前記ポリエステルフィルムは、フレキシブルディスプレイ装置のカバーに適用され、多数の繰り返しフォルディングに対しても元の特性を維持することができる。
前記ポリエステルフィルムは、面内位相差(Ro)が1200nm以下、1000nm以下、600nm以下、500nm以下、400nm以下、300nm以下、または200nm以下であり得る。前記好ましい範囲内のとき、虹ムラの発生を最小限に抑えることができる。
前記ポリエステルフィルムはポリエステル樹脂を含む。
前記ポリエステルフィルムは、10μm〜500μmの厚さを有し得る。または、前記ポリエステルフィルムの厚さは、10μm〜300μm、10μm〜100μm、10μm〜80μm、20μm〜60μm、または40μm〜60μmであり得る。
このようなポリエステルフィルムは、延伸比が調節された二軸延伸および特定温度における熱処理を含む工程により製造され得る。
まず、ポリエステル樹脂を押し出して未延伸シートを形成し得る。この際、前記ポリエステル樹脂の組成は、前記例示したとおりである。
前記予熱温度の範囲は、前記ポリエステル樹脂のガラス転移温度(Tg)を基準に、Tg+5℃〜Tg+50℃を満足する温度範囲で決定され得、一例として、70℃〜100℃の温度範囲であり得る。前記範囲内のとき、前記シートが延伸されやすい柔軟性を確保するとともに、延伸中に破断する現象を効果的に防止し得る。
一実現例に係る積層体は、フレキシブルディスプレイ装置用透明カバーと、前記透明カバー上に配置される前記実現例によるポリエステルフィルムとを含む。
一実現例によるフレキシブルディスプレイ装置は、前記実現例によるポリエステルフィルムをカバーに含む。
以下、実施例によりさらに具体的に説明するが、これらの範囲に限定されるものではない。
ポリエチレンテレフタレート(PET)樹脂を押出機において約250℃〜280℃にて押出およびキャスティングして未延伸シートを製造した。前記未延伸シートを予熱し、長さ方向(MD)および幅方向(TD)に対してそれぞれ3倍〜4倍に延伸するが、これらの2方向に対する延伸比間の比率を調節した。以降、延伸されたシートを熱固定し、3%〜5%の弛緩率で3秒〜10秒間弛緩し、冷却して、厚さ50μmのポリエステルフィルムを製造した。この際、前記延伸時の予熱温度、各方向別延伸比、延伸温度、熱固定温度、および弛緩率を下記の表1のように調節して、厚さ50μmのポリエステルフィルムを製造した。
前記で製造したポリエステルフィルムの長さ方向(MD)または幅方向(TD)に対する引張試験を行うために、下記のような大きさに裁断して試験片を得た後、万能試験機(UTM)を利用して以下の条件で引っ張りながら応力によるひずみ率を測定した。
−試験片の幅:15mm(引張方向に垂直な方向に対する初期寸法)
−試験片の厚さ:50μm
−測定温度:常温
−引張速度:50mm/min
−引張方向:長さ方向(MD)または幅方向(TD)
その結果を下記表2にまとめた。
結晶化度は、X線回折(XRD)分析により、非晶性と認められるピークの面積(A)および結晶性ピークの面積(B)を測定した後、ピーク全体の面積(A+B)に対する結晶性ピークの面積(B)の百分率(%)値で求めた。
前記で製造したポリエステルフィルムと透明ポリイミドフィルムとを積層した後、ASTM D2176およびTAPPI T511に基づくMITフォルディングテスト(MIT folding test)を、MIT耐折疲労試験機(folding endurance tester、MIT−DA、東洋精機製作所)により実施した。
前記で製造したポリエステルフィルムを、ロール状でコアに巻き取り(winding)、1週間が経過した時点で巻き出し(unwinding)の際、フィルム表面に点状の押圧跡が存在するか否かを観察した。その結果を下記の表に示した。
2:アウトフォルディングタイプのフレキシブルディスプレイ装置
10:有機発光ディスプレイ装置
100:保護フィルム
200:カバーウィンドウ
300:フレキシブルディスプレイパネル
310:前面偏光板
320:有機発光ディスプレイパネル
a、b:フォルディングされるポイント
Claims (10)
- 応力-ひずみ曲線(stress-strain curve)において、ひずみ率が2%〜3%の区間における決定係数(R2)が0.985以上で、結晶化度が55%以上である、ポリエステルフィルム。
- 前記ひずみ率が2%〜3%の区間における決定係数(R2)が、面内の互いに垂直な第1方向および第2方向に対してそれぞれ0.985以上である、請求項1に記載のポリエステルフィルム。
- 前記ポリエステルフィルムは、
応力-ひずみ曲線において、ひずみ率が0%〜2%の区間における決定係数(R2)が0.990以上である、請求項1に記載のポリエステルフィルム。 - 前記ポリエステルフィルムは、
応力-ひずみ曲線において、ひずみ率が2%および4%における応力間の差が10MPa以上である、請求項1に記載のポリエステルフィルム。 - 前記ポリエステルフィルムは、
応力-ひずみ曲線において、ひずみ率が4%における応力が65MPa〜85MPaである、請求項4に記載のポリエステルフィルム。 - 前記ポリエステルフィルムは、
応力-ひずみ曲線において、応力が80MPaに対するひずみ率が3%〜8%である、請求項1に記載のポリエステルフィルム。 - 前記ポリエステルフィルムは二軸延伸されたものであり、
前記二軸に対するそれぞれの延伸比間の比率が1:0.8〜1:1.2である、請求項1に記載のポリエステルフィルム。 - 前記ポリエステルフィルムは、195℃以上の温度にて熱処理されたものである、請求項1に記載のポリエステルフィルム。
- フレキシブルディスプレイ装置用透明カバーと、
前記透明カバー上に配置されるポリエステルフィルムとを含み、
前記ポリエステルフィルムは、応力-ひずみ曲線においてひずみ率が2%〜3%の区間における決定係数(R2)が0.985以上で、結晶化度が55%以上である、積層体。 - 前記透明カバーは、透明ポリイミド系フィルムまたは超薄型ガラス(UTG)であり、
前記積層体は、剥離が生じるまでの繰り返しフォルディング回数が20万回以上である、請求項9に記載の積層体。
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