JP5740216B2 - 液晶配向膜、およびそれを具備する液晶表示装置 - Google Patents
液晶配向膜、およびそれを具備する液晶表示装置 Download PDFInfo
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- JP5740216B2 JP5740216B2 JP2011130352A JP2011130352A JP5740216B2 JP 5740216 B2 JP5740216 B2 JP 5740216B2 JP 2011130352 A JP2011130352 A JP 2011130352A JP 2011130352 A JP2011130352 A JP 2011130352A JP 5740216 B2 JP5740216 B2 JP 5740216B2
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Landscapes
- Liquid Crystal (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
Description
前記液晶配向膜の光軸が膜面に対して略垂直であり、かつ光学的に負の一軸異方性を有する位相差を発現する、液晶配向膜。
前記2枚の透明電極基板のいずれか一方に成膜された前記液晶配向膜が、請求項1の液晶配向膜である、液晶表示装置。
[3]前記[2]に記載の液晶表示装置であって、該液晶表示装置の液晶配向モードがIPSモードである、液晶表示装置。
[4]前記[2]に記載の液晶表示装置であって、該液晶表示装置の液晶配向モードがTNモードである、液晶表示装置。
[5]液晶層よりも光出射側に配置された位相差膜をさらに有し、
前記位相差膜の光軸が膜面に対して平行であって、かつ光学的に負の一軸異方性を有する、[3]または[4]に記載の液晶表示装置。
mは、式(C−1)で表される繰返し構造単位の繰返し数を示し、nは、式(C−2)で表される繰返し構造単位の繰返し数を示し、かつmの平均値:nの平均値=1:9〜9:1であり;
一般式(C−1)及び(C−2)中、R及びR”はそれぞれ独立して、炭素数4〜27の4価の基であり、かつ脂肪族基、単環式脂肪族基、縮合多環式脂肪族基、単環式芳香族基、もしくは縮合多環式芳香族基を示すか、環式脂肪族基が直接もしくは架橋員により相互に連結された非縮合多環式脂肪族基を示すか、または芳香族基が直接もしくは架橋員により相互に連結された非縮合多環式芳香族基を示し;
一般式(C−2)において、R’は、炭素数4〜51の2価の基であり、かつ脂肪族基、単環式脂肪族基(但し、1,4-シクロヘキシレン基を除く)、縮合多環式脂肪族基、単環式芳香族基もしくは縮合多環式芳香族基であるか、環式脂肪族基が直接もしくは架橋員により相互に連結された非縮合多環式脂肪族基であるか、または芳香族基が直接もしくは架橋員により相互に連結された非縮合多環式芳香族基である)
[8]前記一般式(C−2)において、R'は、一般式(B−2)で表されるジアミン由来のユニットである、[7]に記載の液晶配向膜。
ポリアミド酸を構成するテトラカルボン酸二無水物は、下記一般式(A)で表される。
ポリアミド酸を構成するジアミンは、下記一般式(B−1)〜(B−3)で表されるジアミンを少なくとも一種含む。ジアミンには、下記(B−1)〜(B−3)で表されるジアミンが2種以上含まれていてもよく、また(B−1)〜(B−3)で表されるジアミン以外のジアミン(B−4)が含まれていてもよい。
ポリアミド酸含有溶液に含まれるポリアミド酸としては、特に一般式(A)で表されるテトラカルボン酸二無水物と一般式(B−1)で表されるジアミンとのポリアミド酸ブロック(下記一般式(C)で表される)と、一般式(A)で表されるテトラカルボン酸二無水物と一般式(B−4)で表されるジアミンとのポリイミド酸ブロック(下記一般式(D)で表される)とが、結合したブロックポリアミド酸イミドが好ましい。
ポリアミド酸含有溶液中のポリアミド酸の濃度は、20重量%以下とすることが好ましく、より好ましくは10重量%以下である。
Re=S(nx−ny)×d
K={(nx+ny)/2−nz}×d
1,4-ビス(アミノメチル)シクロヘキサン(1,4-BAC)を、N,N-ジメチルアセトアミド(DMAc)に加えて攪拌した。1,4-ビス(アミノメチル)シクロヘキサン(1,4-BAC)のシス/トランス比は9/91であった。ここに、粉状の3,3',4,4'-ビフェニルテトラカルボン酸二無水物(BPDA)を装入し、攪拌、脱泡してポリアミド酸(ポリイミド前駆体ポリマー)を含む溶液(ポリイミド前駆体ポリマーワニス)を得た。得られたポリアミド酸の固有対数粘度は、0.94dL/g(35℃、0.5g/dL)であった。
温度計、攪拌機、窒素導入管を備えた300mLの5つ口セパラブルフラスコに、1,4-ジアミノシクロヘキサン(CHDA)16.0g(0.140モル)と、N-メチルピロリドン(NMP)168gとを加えて攪拌した。透明溶液になったら、3,3',4,4'-ビフェニルテトラカルボン酸二無水物(BPDA)37.1g(0.126モル)を粉状のまま装入し、反応容器を120℃に保持したオイルバス中に5分間浴した。BPDA装入後しばらくして塩が析出し、不均一系のまま粘度が増大した。オイルバスを外してから、さらに18時間室温で攪拌し、末端にCHDA由来のアミノ基を有するポリアミド酸オリゴマーを含む溶液(ポリイミド前駆体ポリマーワニス)を得た。
図2は、実施例1で用いた液晶表示装置αの概略構成を示す。液晶表示装置αの液晶配向モードは、IPSモードである。液晶層30-1は、セル厚3μmの面内レタデーションRe=+290nmのIPS液晶である。偏光フィルム100および200は、市販のヨウ素系偏光フィルム(日東電工製:G1220DU)であり、互いの吸収軸を直交させて配置した。ただし、偏光フィルム100および200の保護フィルム(TAC:トリアセチルセルロース)をとりはずし、余分な位相差の発生を抑えた。
図5は、実施例2で用いた液晶表示装置βの概略構成を示す。液晶表示装置βの液晶配向モードは、TNモードである。液晶層30-2は、セル厚5μmのTN液晶とした。偏光フィルム100および200を、市販のヨウ素系偏光フィルム(日東電工製:G1220DU)とした。ただし、偏光フィルム100および200の保護フィルム(TAC:トリアセチルセルロース)はとりはずし、余分な位相差の発生を抑制した。
20 ガラス基板
11,21 透明電極膜
12,22 液晶配向膜
12-1,22-1 液晶配向膜
12-2,22-2 液晶配向膜
30,30-1,30-2 液晶層
40 カラーフィルター
50,60 位相差フィルム
50-1 −A位相差フィルム
60-2 +A位相差フィルム
70 カラーフィルター側基板
80 TFT側基板
100,200 偏光フィルム
θ 頂角
φ 偏光板吸収軸からの煽り角度
Claims (9)
- 液晶を配向させる機能を有する液晶配向膜であって、
前記液晶配向膜の光軸が膜面に対して略垂直であり、かつ光学的に負の一軸異方性を有する位相差を発現する、液晶配向膜。 - 対向する2枚の透明電極基板と、前記2枚の透明電極基板の間に配置された液晶層と、前記2枚の透明電極基板のそれぞれに成膜され、前記液晶を配向させる液晶配向膜と、を含む液晶表示装置であって、
前記2枚の透明電極基板のいずれか一方に成膜された前記液晶配向膜が、請求項1の液晶配向膜である、液晶表示装置。 - 請求項2に記載の液晶表示装置であって、該液晶表示装置の液晶配向モードがIPSモードである、液晶表示装置。
- 請求項2に記載の液晶表示装置であって、該液晶表示装置の液晶配向モードがTNモードである、液晶表示装置。
- 液晶層よりも光出射側に配置された位相差膜をさらに有し、
前記位相差膜の光軸が膜面に対して平行であって、かつ光学的に負の一軸異方性を有する、請求項3または4に記載の液晶表示装置。 - 前記液晶配向膜が、下記一般式(A)で表されるテトラカルボン酸二無水物と、下記一般式(B−1)〜(B−3)で表されるジアミンを反応させて得られるポリイミド材料を含む、請求項1に記載の液晶配向膜。
- 前記液晶配向膜が、下記式(C−1)で表される繰返し構造単位で構成されるブロックと、下記式(C−2)で表される繰返し構造単位で構成されるブロックとを有するブロックポリイミドを含む、請求項1に記載の液晶配向膜。
mは、式(C−1)で表される繰返し構造単位の繰返し数を示し、nは、式(C−2)で表される繰返し構造単位の繰返し数を示し、かつmの平均値:nの平均値=1:9〜9:1であり;
一般式(C−1)及び(C−2)中、R及びR”はそれぞれ独立して、炭素数4〜27の4価の基であり、かつ脂肪族基、単環式脂肪族基、縮合多環式脂肪族基、単環式芳香族基、もしくは縮合多環式芳香族基を示すか、環式脂肪族基が直接もしくは架橋員により相互に連結された非縮合多環式脂肪族基を示すか、または芳香族基が直接もしくは架橋員により相互に連結された非縮合多環式芳香族基を示し;
一般式(C−2)において、R’は、炭素数4〜51の2価の基であり、かつ脂肪族基、単環式脂肪族基(但し、1,4-シクロヘキシレン基を除く)、縮合多環式脂肪族基、単環式芳香族基もしくは縮合多環式芳香族基であるか、環式脂肪族基が直接もしくは架橋員により相互に連結された非縮合多環式脂肪族基であるか、または芳香族基が直接もしくは架橋員により相互に連結された非縮合多環式芳香族基である) - 前記一般式(C−2)において、R'は、一般式(B−2)で表されるジアミン由来のユニットである、請求項7に記載の液晶配向膜。
- 前記一般式(C−1)または前記一般式(C−2)中、R及びR”はそれぞれ独立して、下記式(R1)〜(R3)のいずれかで示される、請求項7に記載の液晶配向膜。
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