Liquid crystal display device

外国特許コード	F110003544
整理番号	B58-01WO
掲載日	2011年6月29日
出願国	アメリカ合衆国
出願番号	59317005
公報番号	20080259254
公報番号	7576829
出願日	平成17年3月15日(2005.3.15)
公報発行日	平成20年10月23日(2008.10.23)
公報発行日	平成21年8月18日(2009.8.18)
国際出願番号	JP2005004481
国際公開番号	WO2005090520
国際出願日	平成17年3月15日(2005.3.15)
国際公開日	平成17年9月29日(2005.9.29)
優先権データ	特願2004-079563 (2004.3.19) JP 特願2004-192448 (2004.6.30) JP 2005WO-JP04481 (2005.3.15) WO
発明の名称 （英語）	Liquid crystal display device
発明の概要（英語）	(US7576829) Presents a liquid crystal display device that does not require a surface orientation treatment, dramatically improves the response rate of dynamic image displays and does not experience light leaks when the display is black, which means to yield a dark field of vision. The liquid crystal display device comprises polymer-stabilized blue phase liquid crystals sandwiched between a pair of clear substrates. The liquid crystal display device obtained using polymer-stabilized blue phase liquid crystals exhibits large double refraction changes when an electrical field is applied in an in-plane direction to the cell substrates. The polymer-stabilized blue phases liquid crystals comprises a low molecular weight liquid crystal that allows a blue phase to appear between cholesteric and isotropic phases and polymer network formed in the low molecular weight liquid crystals. Furthermore, a liquid crystal display device that does not leak light when the display is black (yields a dark field of vision) can be obtained by optimizing the type and amount of a chiral dopant added to the liquid crystals.
特許請求の範囲（英語）	[claim1] 1. A liquid crystal display device comprising a polymer-stabilized blue phase liquid crystal sandwiched between a pair of clear substrates, wherein the polymer-stabilized blue phase liquid crystal comprises a low molecular weight liquid crystal that allows a blue phase to appear between a cholesteric phase and an isotropic phase and a polymer network formed in the low molecular weight liquid crystal, and an electrical field is applied parallel to the substrates. [claim2] 2. The liquid crystal display device of claim 1, wherein the polymer-stabilized blue phase liquid crystal contains a chiral dopant and the amount of the chiral dopant per the amount of the polymer-stabilized blue phase liquid crystal is adjusted so that the diffraction wavelength of the polymer-stabilized blue phase liquid crystal is outside visible zone (from 380 nm to 750 nm). [claim3] 3. The liquid crystal display device of claim 1, wherein the electrical field is applied using two toothed comb shaped electrodes incorporated alternately in one of the clear substrate surfaces. [claim4] 4. The liquid crystal display device of claim 1, wherein a TFT and a common electrode are incorporated in one of the substrate surfaces and the electrical field is applied between the TFT electrode and the common electrode in a form of an electrical field responding to the on-off input signals of the TFT. [claim5] 5. A polymer-stabilized blue phase liquid crystal, which is constructed from a blue phase of a composite liquid crystal composition comprising a low molecular weight liquid crystal and a polymer network, wherein the low molecular weight liquid crystal allows a blue phase to appear between a cholesteric phase and an isotropic phase and a polymer network is formed by polymerizing non-liquid crystalline monomers along with a crosslinking agent, wherein the polymer-stabilized blue phase liquid crystal contains a chiral dopant and the amount of the chiral dopant per the amount of the polymer-stabilized blue phase liquid crystal is adjusted so that the diffraction wavelength of the polymer-stabilized blue phase liquid crystal is outside visible zone (from 380 nm to 750 nm). [claim6] 6. A liquid crystal display device comprising a polymer-stabilized blue phase liquid crystal of claim 5 sandwiched between a pair of clear substrates, wherein an electrical field is applied parallel to the substrates. [claim7] 7. The liquid crystal display device of claim 6, wherein the electrical field is applied using two toothed comb shaped electrodes incorporated alternately in one of the clear substrate surfaces. [claim8] 8. The liquid crystal display device of claim 6, wherein a TFT and a common electrode are incorporated in one of the substrate surfaces and the electrical field is applied between the TFT electrode and the common electrode in a form of an electrical field responding to the on-off input signals of the TFT. [claim9] 9. The liquid crystal display device of claim 7, wherein a TFT and a common electrode are incorporated in one of the substrate surfaces and the electrical field is applied between the TFT electrode and the common electrode in a form of an electrical field responding to the on-off input signals of the TFT. [claim10] 10. The liquid crystal display device of claim 2, wherein the electrical field is applied using two toothed comb shaped electrodes incorporated alternately in one of the clear substrate surfaces. [claim11] 11. The liquid crystal display device of claim 2, wherein a TFT and a common electrode are incorporated in one of the substrate surfaces and the electrical field is applied between the TFT electrode and the common electrode in a form of an electrical field responding to the on-off input signals of the TFT.
発明者/出願人（英語）	KIKUCHI HIROTSUGU KAJIYAMA TISATO NAGAMURA TOSHIHIKO HISAKADO YOSHIAKI JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)	C09K  19/02      成分の光学的，電気的あるいは物理的性質により特徴づけられるもの一般 C09K  19/54      特定の中間相を示さない添加剤 C09K  19/58      ドーパントあるいは電荷移動剤 G02F   1/13      液晶に基づいたもの，例．単一の液晶表示セル G02F   1/1334    高分子分散型液晶に基づいたもの G02F   1/1343    電極 G02F   1/137     特定の電気または磁気光学効果，例．外場誘起相転移，配向効果，ゲスト－ホスト相互作用，動的散乱，によって特徴づけられたもの
参考情報 （研究プロジェクト等）	SORST Selected in Fiscal 2003