JP6221017B1 - 光学積層体、偏光板及び表示装置 - Google Patents
光学積層体、偏光板及び表示装置 Download PDFInfo
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Abstract
Description
Y>X ・・・(1)
Y≦X+17 ・・・(2)
Y≦57 ・・・(3)
19≦X≦40 ・・・(4)
0.5mm幅の光学くしを用いた透過像鮮明度が30〜70%であり、光学機能層の最表面の表面凹凸形状を光干渉方式で計測した場合、凹凸高さが0.1μm以上である凸部分の数が、測定面積1mm2当たり600個以上である。
|nz−nf|≧0.025 ・・・(α)
|nz−nf|≧0.035 ・・・(β)
Y>X ・・・(1)
Y≦X+17 ・・・(2)
Y≦57 ・・・(3)
19≦X≦40 ・・・(4)
25≦X≦35 ・・・(4)’
透光性基体として、厚さ40μmのトリアセチルセルロースフィルムを使用した。透光性基体上に、以下の光学機能層形成用塗工液を塗布し、乾燥(溶媒を揮発)させた後、塗膜を重合により硬化させることによって、光学機能層を形成した。
・基材樹脂:UV/EB硬化性樹脂 ライトアクリレートPE−3A(ペンタエリスリトールトリアクリレート、共栄社化学株式会社製)、屈折率1.52
・樹脂粒子(有機フィラー):架橋スチレン単分散粒子 SX350H(綜研化学株式会社製) 平均粒径3.5μm、屈折率1.595
・コロイダルシリカ:オルガノシリカゾル MEK−ST−40(日産化学工業株式会社製) 平均粒径10〜15nm
・合成スメクタイト:ルーセンタイト SAN(コープケミカル株式会社製)
・フッ素系レベリング剤:メガファック F−471(DIC株式会社製) 0.1%
・溶剤:トルエン
透過像鮮明度は、JIS K7105に従い、写像性測定器(ICM−1T、スガ試験器株式会社製)を用いて、光学くし幅0.5mmで測定した。
ヘイズ値は、JIS K7105に従い、ヘイズメーター(NDH2000、日本電色工業株式会社製)を用いて測定した。ここで、光学積層フィルムのヘイズ値を全ヘイズとした。また、光学積層フィルムの微細凹凸形状が設けられた表面に粘着剤付き透明性シートを貼り合わせて測定したヘイズ値から、粘着剤付き透明性シートのヘイズ値を引いた値を、内部ヘイズとした。尚、粘着材付き透明性シートとして、ポリエチレンテレフタレートフィルム(厚さ38μm)に、アクリル系粘着材(厚さ10μm)を塗布したものを用いた。
光学機能層の膜厚は、リニアゲージ(D−10HS、株式会社尾崎製作所製)を用いて測定した。
まず、耐ギラツキ性及びコントラストの両方を良好とする内部ヘイズ(19〜40%)を得るために必要な樹脂粒子(有機フィラー)の添加量を調べた。樹脂粒子及び2種類の無機微粒子を表1に記載の添加量で添加した光学機能層形成用塗工液を調整し、上述した作製方法にしたがって光学積層体を作製した。作製した光学積層体の内部ヘイズを求めた。
次に、樹脂粒子及び2種類の無機微粒子を下記の表3に記載の添加量で添加した光学機能層形成用塗工液を用いて、実施例1〜14及び比較例1〜10に係る光学積層体を作製した。
光学機能層の最表面の凹凸形状は、非接触表面・層断面形状計測システム(測定装置:バートスキャンR3300FL−Lite−AC、解析ソフトウェア:VertScan4、株式会社菱化システム製)を用いて、光干渉方式により測定した。測定データを装置の解析ソフトウェアを用いて解析し、凹凸高さが0.1μm以上である凸部分の数を解析ソフトウェアで計測した。
防眩性は各実施例及び各比較例の光学積層体を透明な粘着層を介して黒色アクリル板(スミペックス960 住友化学株式会社製)に貼り合せた後、黒アクリル板の中心から垂直に50cm離れた場所より照度250lxの条件下で見た場合の自分の像(顔)の黒アクリル板への写り込みの有無を任意の100人の目視判定により評価した。評価結果は、写り込みを感じなかった人が70人以上の場合を「○」、30人以上70人未満の場合を「△」、30人未満の場合を「×」とした。
耐ギラツキ性は、各実施例及び各比較例の光学積層体を透明な粘着層を介して液晶モニター(iPad3(第3世代) アップルインコーポレイテッド製、264ppi、「iPad」は登録商標)の画面表面に貼り合わせた後、液晶モニターを緑色表示状態にし、暗室下で画面表面の中心から垂直に50cm離れた場所より液晶モニターを見た場合のギラツキの有無を任意の100人の目視判定により評価した。評価結果は、ギラツキを感じなかった人が70人以上の場合を「○」、30人以上70人未満の場合を「△」、30人未満の場合を「×」とした。
輝度比は、各実施例及び各比較例の光学積層体と透光性基体を透明な粘着層を介して液晶モニター(iPad3(第3世代) アップルインコーポレイテッド製、264ppi、「iPad」は登録商標)の画面表面に貼り合わせた後、液晶モニターを白色表示状態にし、暗室下で画面表面の中心から垂直に70cm離れた場所より分光放射計(SU−UL1R 株式会社トプコン製)にて輝度を測定した。透光性基体の輝度を100%として、93%以上の場合を「○」、93%未満の場合を「×」とした。
0<B≦0.5A−0.0225 ・・・(5)
7.0≦A≦15.0 ・・・(6)
2 光学機能層
3、5、6、8 透明基材
4、7 偏光層
11、12 偏光板
13 液晶セル
14 バックライトユニット
100 光学積層体
110 偏光板
120 表示装置
Claims (10)
- 透光性基体上に光学機能層が少なくとも1層以上積層されてなる光学積層体であって、
前記光学機能層の少なくとも一方の面に凹凸形状が形成されており、
前記光学機能層が2種類の無機微粒子と樹脂粒子とを含有し、
前記光学積層体が以下の条件式(1)〜(4)を満足する内部ヘイズXと、全ヘイズYとを有し、
Y>X ・・・(1)
Y≦X+17 ・・・(2)
Y≦57 ・・・(3)
19≦X≦40 ・・・(4)
0.5mm幅の光学くしを用いた透過像鮮明度が30〜70%であり、
前記光学機能層の最表面の凹凸形状を光干渉方式で計測した場合、凹凸高さが0.1μm以上である凸部分の数が、測定面積1mm2当たり600個以上であることを特徴とする、光学積層体。 - 前記光学機能層の最表面の凹凸形状を光干渉方式で計測した場合、凹凸高さが0.1μm以上である全ての凸部分の数のうち、面積が100μm2未満である凸部分の数が65%以上であることを特徴とする、請求項1に記載の光学積層体。
- 前記光学機能層の最表面の凹凸形状を光干渉方式で計測した場合、凹凸高さが0.1μm以上である全ての凸部分の平均面積が500μm2以下であることを特徴とする、請求項1に記載の光学積層体。
- 前記光学機能層が含有する2種類の無機微粒子が、無機ナノ粒子と膨潤性粘土とであることを特徴とする、請求項1に記載の光学積層体。
- 前記光学機能層中の前記樹脂粒子の含有割合A(%)と、前記無機ナノ粒子の含有割合B(%)とが、以下の条件式(5)及び(6)を満足することを特徴とする、請求項4に記載の光学積層体。
0<B≦0.50A−0.0225 ・・・(5)
7.0≦A≦15.0 ・・・(6) - 前記光学機能層が、放射線硬化型樹脂組成物を主成分とする1層以上の光学機能層からなることを特徴とする、請求項1に記載の光学積層体。
- 前記光学機能層が含有する2種類の無機微粒子が凝集体を形成していることを特徴とする、請求項1に記載の光学積層体。
- 屈折率調整層、帯電防止層、防汚層のうちの少なくとも1層を更に備える、請求項1に記載の光学積層体。
- 請求項1に記載の光学積層体を構成する前記透光性基体上に、偏光基体が積層されてなることを特徴とする、偏光板。
- 請求項1に記載の光学積層体を備えることを特徴とする、表示装置。
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