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 |
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| 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. |
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| IPC(International Patent Classification) |
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| Reference ( R and D project ) | SORST Selected in Fiscal 2003 |
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Contact Information for " Liquid crystal display device "
- Japan Science and Technology Agency Department of Intellectual Property Management
- URL: http://www.jst.go.jp/chizai/
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