JP2005114836A - 光学補償フィルム、それを用いた光学補償層付偏光板、および、それらを用いた液晶表示装置 - Google Patents
光学補償フィルム、それを用いた光学補償層付偏光板、および、それらを用いた液晶表示装置 Download PDFInfo
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- JP2005114836A JP2005114836A JP2003345875A JP2003345875A JP2005114836A JP 2005114836 A JP2005114836 A JP 2005114836A JP 2003345875 A JP2003345875 A JP 2003345875A JP 2003345875 A JP2003345875 A JP 2003345875A JP 2005114836 A JP2005114836 A JP 2005114836A
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Abstract
【解決手段】 本発明の光学補償フィルムは、下記条件(I)を満たす、という構成である。
3<(nx−nz)/(nx−ny)<8 (I)
上記条件(I)中、nx、nyおよびnzは、それぞれ、前記光学補償フィルムにおけるX軸、Y軸およびZ軸方向の屈折率を示し、前記X軸とは、前記光学補償フィルムの面内において最大の屈折率を示す軸方向であり、Y軸は、前記面内において前記X軸に対して垂直な軸方向であり、Z軸は、前記X軸およびY軸に垂直な厚み方向を示す。
本発明の光学補償フィルムを液晶表示装置に用いれば、例えば、図3Aに示すように、表示品位の視野角特性が改善され、装置の薄型化および低コスト化が可能となる。
【選択図】 図3
Description
上記条件(I)中、nx、nyおよびnzは、それぞれ、前記光学補償フィルムにおけるX軸、Y軸およびZ軸方向の屈折率を示し、前記X軸とは、前記光学補償フィルムの面内において最大の屈折率を示す軸方向であり、Y軸は、前記面内において前記X軸に対して垂直な軸方向であり、Z軸は、前記X軸およびY軸に垂直な厚み方向を示す。なお、前記条件(I)からわかるように、本発明の光学補償フィルムは、nx>ny>nzを示す二軸性の複屈折フィルムである。
Δnd=(nx−ny)d
Rth=(nx−nz)d
また、前記透明保護層は、さらに光学補償機能を有するものでもよい。このように光学補償機能を有する透明保護層としては、例えば、液晶セルにおける位相差に基づく視認角の変化が原因である着色等の防止や、良視認の視野角の拡大等を目的とした公知のものが使用できる。具体的には、例えば、前述した透明樹脂を一軸延伸または二軸延伸した各種延伸フィルムや、液晶ポリマー等の配向フィルム、透明基材上に液晶ポリマー等の配向層を配置した積層体等があげられる。これらの中でも、良視認の広い視野角を達成できることから、前記液晶ポリマーの配向フィルムが好ましく、特に、ディスコティック系やネマチック系の液晶ポリマーの傾斜配向層から構成される光学補償層を、前述のトリアセチルセルロースフィルム等で支持した光学補償位相差板が好ましい。このような光学補償位相差板としては、例えば、富士写真フィルム株式会社製「WVフィルム」等の市販品があげられる。なお、前記光学補償位相差板は、前記位相差フィルムやトリアセチルセルロースフィルム等のフィルム支持体を2層以上積層させることによって、位相差等の光学特性を制御したもの等でもよい。
前記透明保護層は、例えば、偏光フィルムに前記各種透明樹脂を塗布する方法、前記偏光フィルムに前記透明樹脂製フィルムや前記光学補償位相差板等を積層する方法等の従来公知の方法によって適宜形成でき、また市販品を使用することもできる。
(光学特性測定方法)
フィルム面内の位相差Δndおよび厚み方向の位相差Rthの値は、各実施例、比較例、参考例で得られた基材上のフィルムを、アクリル系粘着剤を介して、前記基材からガラス板に転写し、ガラス板と前記フィルムとの積層体として測定した。この測定には、王子計測機器社製商品名KOBRA−21ADHを用いて、測定波長λ=590で行った。なお、前記測定に用いたアクリル系粘着剤付ガラス板は、予めその光学特性を測定したところ、面内および厚み方向においてほぼ等方的であった。
自由端一軸延伸の延伸倍率を2%とした以外は、実施例1と同様にして実施し、延伸された基材上に厚み5.2μmの光学補償フィルムを得た。この光学補償フィルムの光学特性は、Δnd=18.1nm、Rth=176.7nm、(nx-nz)/(nx-ny)=9.8であった。
自由端一軸延伸の延伸倍率を10%とした以外は、実施例1と同様にして実施し、延伸された基材上に厚み4.7μmの光学補償フィルムを得た。この光学補償フィルムの光学特性は、Δnd=87.1nm、Rth=209.3nm、(nx-nz)/(nx-ny)=2.4であった。
d(厚み) (nx-ny)・d (nx-nz)・d (nx-nz)/(nx-ny) 全方位80度
μm nm nm の視野角
実施例1 6.6 50.0 300.0 6.0 ○
実施例2 5.6 60.3 250.2 4.1 ○
実施例3 4.2 50.8 187.7 3.7 ○
比較例1 5.2 18.1 176.7 9.8 ×
比較例2 4.7 87.1 209.3 2.4 ×
2 基材
3 粘着剤層
4 偏光子
5 保護フィルム
6 液晶セル
Claims (11)
- 下記条件(I)を満たすことを特徴とする光学補償フィルム。
3<(nx−nz)/(nx−ny)<8 (I)
上記式(I)中、nx、nyおよびnzは、それぞれ、前記光学補償フィルムにおけるX軸、Y軸およびZ軸方向の屈折率を示し、前記X軸とは、前記光学補償フィルムの面内において最大の屈折率を示す軸方向であり、Y軸は、前記面内において前記X軸に対して垂直な軸方向であり、Z軸は、前記X軸およびY軸に垂直な厚み方向を示す。 - 厚みが、2μm〜10μmである請求項1に記載の光学補償フィルム。
- 光学補償フィルムの形成材料が、ポリアミド、ポリイミド、ポリエステル、ポリエーテルケトン、ポリアミドイミドおよびポリエステルイミドからなる群から選択される少なくとも一種のポリマー材料を含む請求項1または2に記載の光学補償フィルム。
- 前記構造式(1)において、R1およびR3がメチル基であり、R2およびR4が水素である請求項4に記載の光学補償フィルム。
- 液晶画像表示装置の液晶セルと偏光板との間に配置された場合に、その表示画面の法線を基準として全方位に0〜80°の範囲で傾斜させた方向から測定したコントラスト比が、10以上を示す請求項1から5のいずれかに記載の光学補償フィルム。
- 請求項1から6のいずれかに記載の光学補償フィルムを含む光学補償層付偏光板。
- 液晶セルおよび光学部材を含み、前記液晶セルの少なくとも一方の表面に前記光学部材が配置された液晶パネルであって、前記光学部材が、請求項1から6に記載の光学補償フィルムおよび請求項7に記載の光学補償層付偏光板の少なくとも一つである液晶パネル。
- 液晶パネルを含む液晶表示装置であって、前記液晶パネルが請求項8に記載の液晶パネルである液晶表示装置。
- 前記液晶パネルの液晶セルが、VA(垂直配向)モードである請求項9に記載の液晶表示装置。
- 請求項1から6に記載の光学補償フィルムおよび請求項7に記載の光学補償層付偏光板の少なくとも一つを含む画像表示装置。
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