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Liquid crystal display device

Foreign code F110003544
File No. B58-01WO
Posted date Jun 29, 2011
Country United States of America
Application number 59317005
Gazette No. 20080259254
Gazette No. 7576829
Date of filing Mar 15, 2005
Gazette Date Oct 23, 2008
Gazette Date Aug 18, 2009
International application number JP2005004481
International publication number WO2005090520
Date of international filing Mar 15, 2005
Date of international publication Sep 29, 2005
Priority data
  • P2004-079563 (Mar 19, 2004) JP
  • P2004-192448 (Jun 30, 2004) JP
  • 2005WO-JP04481 (Mar 15, 2005) WO
Title Liquid crystal display device
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • KIKUCHI HIROTSUGU
  • KAJIYAMA TISATO
  • NAGAMURA TOSHIHIKO
  • HISAKADO YOSHIAKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) SORST Selected in Fiscal 2003
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