JP2014005458A - 高分子/液晶複合体及びそれを有する液晶表示装置 - Google Patents
高分子/液晶複合体及びそれを有する液晶表示装置 Download PDFInfo
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Abstract
【解決手段】ブルー相を発現する高分子/液晶複合体は、複数のドメインを含んで形成され、各ドメインの境界において、配向不良が生じやすい。したがって、各ドメインの境界において、配向周期性を緩和させる事で、隣接するドメインの境界に起因する配向不良の発生を抑制することができる。具体的には、ブルー相を発現する高分子/液晶複合体であって、高分子/液晶複合体は、複数のドメインを含んで形成され、ドメインの各々の大きさが、3μm以下である高分子/液晶複合体である。
【選択図】図1
Description
本実施の形態では、本発明の一態様であるブルー相を発現する高分子/液晶複合体について図1を用いて説明する。
液晶組成物として、ブルー相を発現する液晶材料、液晶性モノマー、非液晶性モノマー、及び重合開始剤を含む構成を適用することができる。
上述した液晶組成物に対して高分子安定化処理(重合処理)をすることにより、高分子によってブルー相が安定化された液晶材料を含む高分子/液晶複合体を得ることができる。なお、当該高分子安定化処理とは、当該液晶組成物に含まれる液晶性モノマー及び非液晶性モノマーの重合を行うことで形成される高分子(高分子ネットワーク)によって液晶材料のブルー相を安定化させる処理である。
上記の高分子安定化処理によって本発明の一態様に係る高分子/液晶複合体を得ることができる。
本実施の形態では、本発明の一態様である高分子/液晶複合体を用いて作製する液晶表示装置について説明する。なお、液晶表示装置としては、パッシブマトリクス型の液晶表示装置でもアクティブマトリクス型の液晶表示装置でも適用可能であるが、本実施の形態においては、アクティブマトリクス型の液晶表示装置に適用した場合について、図2を用いて説明する。
〈液晶組成物〉
条件Aの液晶組成物は、ブルー相を発現する液晶材料であるE−8(略称)(LCC社製)、4−(trans−4−n−プロピルシクロヘキシル)−3’,4’−ジフルオロ−1,1’−ビフェニル(略称:CPP−3FF)、及び4−n−ペンチル安息香酸4−シアノ−3−フルオロフェニル(略称:PEP−5CNF)と、液晶性モノマーである1,4−ビス[4−(6−アクリロイルオキシ−n−へキシル−1−オキシ)ベンゾイルオキシ]−2−メチルベンゼン(略称:RM257−O6、シントンケミカルズ社製)と、非液晶性モノマーであるメタクリル酸ドデシル(略称:DMeAc)(東京化成工業株式会社製)と、重合開始剤である2,2−ジメトキシ−2−フェニルアセトフェノン(略称:DMPAP)(東京化成工業株式会社製)と、カイラル剤である1,4:3,6−ジアンヒドロ−2,5−ビス[4−(n−ヘキシル−1−オキシ)安息香酸]ソルビトール(略称:ISO−(6OBA)2)(みどり化学株式会社製)とを有する。
次に、一対のガラス基板間に挟持された条件Aの液晶組成物をシール材によって封止することで液晶セルを作製した。そして、当該液晶セルに対して高分子安定化処理を行った。なお、当該液晶セルの作製は、間に4μmの空隙(セルギャップ)が存在する一対のガラス基板をシール材で貼り合わせた後、注入法によって当該液晶組成物を当該一対のガラス基板間に注入することにより行った。
上述の高分子安定化処理によって、条件Aの高分子/液晶複合体を得た。図3(A)、(B)は、共焦点レーザー顕微鏡(C2 ニコンインステック株式会社製)を用いて観察された条件Aの高分子/液晶複合体のテクスチャを示す図である。なお、当該観察には、波長401nmのレーザー光を用いた。また、測定モードは、反射とした。また、図3(A)は対物レンズ倍率を100倍、図3(B)は対物レンズ倍率を100倍、スキャンスピードを標準測定の1/10(すなわち実効倍率1000倍相当)として、それぞれ室温環境下で当該観察を行った。
〈液晶組成物〉
条件Bの液晶組成物は、ブルー相を発現する液晶材料である、E−8(略称)、CPP−3FF(略称)、及びPEP−5CNF(略称)と、液晶性モノマーである1,4−ビス[4−(3−アクリロイルオキシ−n−プロピル−1−オキシ)ベンゾイルオキシ]−2−メチルベンゼン(略称:RM257−O3、シントンケミカルズ社製)と、非液晶性モノマーであるDMeAc(略称)と、重合開始剤であるDMPAP(略称)と、カイラル剤であるISO−(6OBA)2とを有する。すなわち、条件Bの液晶組成物は、液晶性モノマーを除いて条件Aで用いた液晶組成物と共通の物質を有する。
次に、一対のガラス基板間に挟持された条件Bの液晶組成物をシール材によって封止することで液晶セルを作製した。そして、当該液晶セルに対して高分子安定化処理を行った。なお、当該液晶セルの作製は、間に4μmの空隙(セルギャップ)が存在する一対のガラス基板をシール材で貼り合わせた後、注入法によって当該液晶組成物を当該一対のガラス基板間に注入することにより行った。また、当該シール材として、紫外線及び熱硬化型シール材を用いた。さらに、当該シール材に対して、硬化処理として、90秒間の紫外線(放射照度100mW/cm2)照射処理を行った。そして、当該液晶セルに対して、120℃、1時間の熱処理を行った。そして、当該一対のガラス基板のうち共焦点レーザー顕微鏡による観察が行われる面側のガラス基板の厚さが0.17mmになるように研磨処理を行った。なお、当該処理前における当該一対のガラス基板のそれぞれの厚さは、0.7mmである。
上述の高分子安定化処理によって、条件Bの高分子/液晶複合体を得た。図4(A)、(B)は、共焦点レーザー顕微鏡(C2 ニコンインステック株式会社製)を用いて観察された条件Bの高分子/液晶複合体のテクスチャを示す図である。なお、当該観察には、レーザー波長401nmのレーザー光を用いた。また、測定モードは、反射とした。また、図4(A)は対物レンズ倍率を100倍、図4(B)は対物レンズ倍率を100倍、スキャンスピードを標準測定の1/10(すなわち実効倍率1000倍相当)として、それぞれ室温環境下で当該観察を行った。
301a ゲート電極層
302 ゲート絶縁層
303 半導体層
305 ソース配線層
305a 配線層
305b 配線層
307 絶縁層
308 共通配線層
309 絶縁層
313 層間膜
320 トランジスタ
341 基板
342 基板
343a 偏光板
343b 偏光板
344 液晶層
346 共通電極層
347 画素電極層
Claims (4)
- ブルー相を発現する高分子/液晶複合体であって、
前記高分子/液晶複合体は、複数のドメインを含んで形成され、
前記ドメインの各々の大きさが、3μm以下である
高分子/液晶複合体。 - 請求項1において、
前記ドメインの各々の大きさが、液晶セルのセルギャップ以下である
高分子/液晶複合体。 - 構造式(100)で表される液晶性モノマーを含む、
請求項1または請求項2に記載の高分子/液晶複合体。
- 請求項1乃至請求項3のいずれか一に記載の高分子/液晶複合体を有する液晶表示装置。
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US20150212348A1 (en) | 2015-07-30 |
US20130321745A1 (en) | 2013-12-05 |
US9036114B2 (en) | 2015-05-19 |
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