The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Jin Yan - One of the best experts on this subject based on the ideXlab platform.
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Polymer-stabilized blue phase liquid crystal with a negative Kerr Constant
Optical Materials Express, 2012Co-Authors: Yuan Chen, Jin Yan, Yifan Liu, Jian-peng Cui, Qiong-hua WangAbstract:A polymer-stabilized blue-phase liquid crystal (BPLC) with a negative Kerr Constant is reported. In a voltage-on state, the double-twist BPLC molecules within the lattice cylinders are reoriented perpendicular to the applied electric field because of their negative dielectric anisotropy. As a result, the induced birefringence has a negative value, which leads to a negative Kerr Constant. The negative sign of Kerr Constant is experimentally validated by using a quarter-wave plate and a vertical field switching cell. Such a BPLC shows a negligible (~1%) hysteresis and fast response time (~1ms) at the room temperature, although its Kerr Constant is relatively small because the employed host has a small Δe.
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polymer stabilized optically isotropic liquid crystals for next generation display and photonics applications
Journal of Materials Chemistry, 2011Co-Authors: Jin Yan, Linghui Rao, Meizi Jiao, Huichuan ChengAbstract:Polymer-stabilized optically isotropic liquid crystals, including blue phases, are emerging as a strong contender for next-generation display technology because they exhibit some revolutionary features such as no need for surface alignment, submillisecond response time, isotropic dark state, and cell gap insensitivity. The basic material properties, including electric field-induced birefringence, dispersion relation of Kerr Constant, and temperature dependent Kerr Constant, are reviewed. Recent progress on blue phase liquid crystal material development and device structures for lowering the operating voltage are introduced. Promising applications and remaining technical challenges are also discussed.
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Dispersion relation on the Kerr Constant of a polymer-stabilized optically isotropic liquid crystal.
Physical review. E Statistical nonlinear and soft matter physics, 2011Co-Authors: Meizi Jiao, Jin YanAbstract:The dispersion relation on the Kerr Constant (K) of a polymer-stabilized isotropic phase (PSIP) liquid-crystal (LC) composite is investigated. Our experimental results show that K decreases as the wavelength (λ) increases. The single-band birefringence dispersion model is used to fit the λK values of the PSIP LC composite. Very good agreement between the experiment and physical model is obtained.
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dispersion relation on the Kerr Constant of a polymer stabilized optically isotropic liquid crystal
Physical Review E, 2011Co-Authors: Meizi Jiao, Jin YanAbstract:).Recently, polymer-stabilized blue-phase liquid crystals(PSBP LCs) have been developed [5–8]. The correspondingKerr Constant of these PSBP LC composites is ∼3–4 ordersof magnitude larger than that of isotropic liquids becauseof the short-range interaction of LC molecules. As a result,the operating voltage is significantly reduced [9,10]. PSBPexhibits some revolutionary features as compared to con-ventional nematic liquid crystals in the following aspects:(1)theisotropicdarkstate,whichleadstowideandsymmetricviewing angle, (2) a submillisecond gray-to-gray responsetime[11],whichenablescolorsequentialdisplayswithtripledopticalefficiencyandresolutiondensity,(3)noneedforalign-ment layers, and (4) insensitivity to the cell gap, provided thatin-plane switching (IPS) electrodes are employed. Therefore,PSBP liquid crystals are attractive for high-speed photonicsand display applications [12,13]. In the PSBP precursor,the blue phase temperature range is widened (7–9
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a large Kerr Constant polymer stabilized blue phase liquid crystal
Applied Physics Letters, 2011Co-Authors: Linghui Rao, Shinichi Yamamoto, Jin Yan, Yasuhiro HasebaAbstract:A polymer-stabilized blue phase liquid crystal (BPLC) composite with a large Kerr Constant (K∼13.7 nm/V2) is developed and its electro-optic properties characterized. In addition to the reduced operating voltage, this BPLC also exhibits a fast response time (∼1 ms), high contrast ratio (>1000:1), and relatively small hysteresis (<6%). It will undoubtedly accelerate the emergence of BPLC for next-generation display and photonic devices.
Hirotsugu Kikuchi - One of the best experts on this subject based on the ideXlab platform.
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A method for enlarging the Kerr Constant of polymer-stabilised blue phases
Liquid Crystals, 2009Co-Authors: Takashi Iwata, Hiroki Higuchi, Ken Suzuki, Hirotsugu KikuchiAbstract:Polymer-stabilised blue phase (PSBP) is one of the most promising materials for display devices because of its superior electro-optical properties compared with conventional nematics. However, the application of the PSBP has a serious practical issue in that the driving voltage required is too high to drive with thin film transitors, that is, the magnitude of the Kerr Constant of PSBPs is insufficient. We present a useful method for increasing the Kerr Constant based on the control of polymer aggregation structure using a cross-linker with a chiral structure. The director distortion arising from polymer networks in the PSBP seems to be responsible for the resulting improvement.
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39 1 invited paper optically isotropic nano structured liquid crystal composites for display applications
SID Symposium Digest of Technical Papers, 2009Co-Authors: Hirotsugu Kikuchi, Shinichi Yamamoto, Takashi Iwata, Yasuhiro Haseba, Hiroki HiguchiAbstract:In this paper, we present the phase behavior and electro-optical Kerr effect of the optically isotropic liquid crystal composites, which require no surface treatment for device fabrication. Anomalously large Kerr Constant, more than 10−8 mV−2 and fast response, less than sub-milli-second were observed at a room temperature.
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optically isotropic nanostructured liquid crystal composite with high Kerr Constant
Applied Physics Letters, 2008Co-Authors: Sukwon Choi, Yasuhiro Haseba, Shinichi Yamamoto, Hiroki Higuchi, Hirotsugu KikuchiAbstract:The relationship between material parameters of host nematic liquid crystals (LCs) and Kerr Constant of their nanostructured chiral LC composites was investigated. We made certain that the Kerr Constant of nanostrutured chiral LC composites was closely related to the parameters of their host LCs, such as value of the difference of refractive index (Δn), the dielectric anisotropy (Δe), and bend to splay elastic Constant ratio (K33∕K11).
Meizi Jiao - One of the best experts on this subject based on the ideXlab platform.
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polymer stabilized optically isotropic liquid crystals for next generation display and photonics applications
Journal of Materials Chemistry, 2011Co-Authors: Jin Yan, Linghui Rao, Meizi Jiao, Huichuan ChengAbstract:Polymer-stabilized optically isotropic liquid crystals, including blue phases, are emerging as a strong contender for next-generation display technology because they exhibit some revolutionary features such as no need for surface alignment, submillisecond response time, isotropic dark state, and cell gap insensitivity. The basic material properties, including electric field-induced birefringence, dispersion relation of Kerr Constant, and temperature dependent Kerr Constant, are reviewed. Recent progress on blue phase liquid crystal material development and device structures for lowering the operating voltage are introduced. Promising applications and remaining technical challenges are also discussed.
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Dispersion relation on the Kerr Constant of a polymer-stabilized optically isotropic liquid crystal.
Physical review. E Statistical nonlinear and soft matter physics, 2011Co-Authors: Meizi Jiao, Jin YanAbstract:The dispersion relation on the Kerr Constant (K) of a polymer-stabilized isotropic phase (PSIP) liquid-crystal (LC) composite is investigated. Our experimental results show that K decreases as the wavelength (λ) increases. The single-band birefringence dispersion model is used to fit the λK values of the PSIP LC composite. Very good agreement between the experiment and physical model is obtained.
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dispersion relation on the Kerr Constant of a polymer stabilized optically isotropic liquid crystal
Physical Review E, 2011Co-Authors: Meizi Jiao, Jin YanAbstract:).Recently, polymer-stabilized blue-phase liquid crystals(PSBP LCs) have been developed [5–8]. The correspondingKerr Constant of these PSBP LC composites is ∼3–4 ordersof magnitude larger than that of isotropic liquids becauseof the short-range interaction of LC molecules. As a result,the operating voltage is significantly reduced [9,10]. PSBPexhibits some revolutionary features as compared to con-ventional nematic liquid crystals in the following aspects:(1)theisotropicdarkstate,whichleadstowideandsymmetricviewing angle, (2) a submillisecond gray-to-gray responsetime[11],whichenablescolorsequentialdisplayswithtripledopticalefficiencyandresolutiondensity,(3)noneedforalign-ment layers, and (4) insensitivity to the cell gap, provided thatin-plane switching (IPS) electrodes are employed. Therefore,PSBP liquid crystals are attractive for high-speed photonicsand display applications [12,13]. In the PSBP precursor,the blue phase temperature range is widened (7–9
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electro optics of polymer stabilized blue phase liquid crystal displays
Applied Physics Letters, 2009Co-Authors: Zhibing Ge, Meizi Jiao, Sebastian Gauza, Haiqing Xianyu, Shintson WuAbstract:Electro-optics of polymer-stabilized blue phase liquid crystal displays (BP LCDs) is analyzed and validated experimentally. A numerical model for characterizing and optimizing the electro-optical and display properties of BP LCDs in in-plane switching and fringe field switching cells is developed. The simulated voltage-dependent transmittance curves agree well with the measured results. To lower the operating voltage while keeping a high transmittance, both electrode width and gap, and large Kerr Constant make important contributions. A wide-view BP LCD using a single biaxial compensation film is simulated.
Yasuhiro Haseba - One of the best experts on this subject based on the ideXlab platform.
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low temperature and high frequency effects on polymer stabilized blue phase liquid crystals with large dielectric anisotropy
Journal of Materials Chemistry C, 2014Co-Authors: Fenglin Peng, Yuan Chen, Shintson Wu, Haiwei Chen, Jiamin Yuan, Yasuhiro HasebaAbstract:We report the low temperature and high frequency effects on polymer-stabilized blue phase liquid crystals (BPLCs) comprising of a large dielectric anisotropy nematic host. Debye dielectric relaxation sets a practical limit even when the device operation temperature is still within the blue phase range. To explain these phenomena, we propose a model to describe the temperature and frequency dependent Kerr Constant and obtain excellent agreement with experiment. Doping a diluter compound to the BPLC host helps to reduce viscosity, which in turn boosts the dielectric relaxation frequency and extends the low temperature operation range.
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a low voltage and submillisecond response polymer stabilized blue phase liquid crystal
Applied Physics Letters, 2013Co-Authors: Yua Che, Shinichi Yamamoto, Yasuhiro HasebaAbstract:We report a polymer-stabilized blue phase liquid crystal (BPLC) whose Kerr Constant is about 2.2× larger than previous record. When filled in a 3.2-μm-thick vertical field switching cell, the on-state voltage is merely 8.4 V (at λ = 514 nm) while keeping submillisecond response time and negligible hysteresis (<1%) at the room temperature. These results imply that the dawn of BPLC era for high speed display and photonic devices has finally arrived.
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39 1 invited paper optically isotropic nano structured liquid crystal composites for display applications
SID Symposium Digest of Technical Papers, 2009Co-Authors: Hirotsugu Kikuchi, Shinichi Yamamoto, Takashi Iwata, Yasuhiro Haseba, Hiroki HiguchiAbstract:In this paper, we present the phase behavior and electro-optical Kerr effect of the optically isotropic liquid crystal composites, which require no surface treatment for device fabrication. Anomalously large Kerr Constant, more than 10−8 mV−2 and fast response, less than sub-milli-second were observed at a room temperature.
Shinichi Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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a low voltage and submillisecond response polymer stabilized blue phase liquid crystal
Applied Physics Letters, 2013Co-Authors: Yua Che, Shinichi Yamamoto, Yasuhiro HasebaAbstract:We report a polymer-stabilized blue phase liquid crystal (BPLC) whose Kerr Constant is about 2.2× larger than previous record. When filled in a 3.2-μm-thick vertical field switching cell, the on-state voltage is merely 8.4 V (at λ = 514 nm) while keeping submillisecond response time and negligible hysteresis (<1%) at the room temperature. These results imply that the dawn of BPLC era for high speed display and photonic devices has finally arrived.
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a large Kerr Constant polymer stabilized blue phase liquid crystal
Applied Physics Letters, 2011Co-Authors: Linghui Rao, Shinichi Yamamoto, Jin Yan, Yasuhiro HasebaAbstract:A polymer-stabilized blue phase liquid crystal (BPLC) composite with a large Kerr Constant (K∼13.7 nm/V2) is developed and its electro-optic properties characterized. In addition to the reduced operating voltage, this BPLC also exhibits a fast response time (∼1 ms), high contrast ratio (>1000:1), and relatively small hysteresis (<6%). It will undoubtedly accelerate the emergence of BPLC for next-generation display and photonic devices.
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A large Kerr Constant polymer-stabilized blue phase liquid crystal
Applied Physics Letters, 2011Co-Authors: Linghui Rao, Shinichi Yamamoto, Jin Yan, Yasuhiro HasebaAbstract:A polymer-stabilized blue phase liquid crystal (BPLC) composite with a large Kerr Constant (K∼13.7 nm/V2) is developed and its electro-optic properties characterized. In addition to the reduced operating voltage, this BPLC also exhibits a fast response time (∼1 ms), high contrast ratio (>1000:1), and relatively small hysteresis (
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39 1 invited paper optically isotropic nano structured liquid crystal composites for display applications
SID Symposium Digest of Technical Papers, 2009Co-Authors: Hirotsugu Kikuchi, Shinichi Yamamoto, Takashi Iwata, Yasuhiro Haseba, Hiroki HiguchiAbstract:In this paper, we present the phase behavior and electro-optical Kerr effect of the optically isotropic liquid crystal composites, which require no surface treatment for device fabrication. Anomalously large Kerr Constant, more than 10−8 mV−2 and fast response, less than sub-milli-second were observed at a room temperature.
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optically isotropic nanostructured liquid crystal composite with high Kerr Constant
Applied Physics Letters, 2008Co-Authors: Sukwon Choi, Yasuhiro Haseba, Shinichi Yamamoto, Hiroki Higuchi, Hirotsugu KikuchiAbstract:The relationship between material parameters of host nematic liquid crystals (LCs) and Kerr Constant of their nanostructured chiral LC composites was investigated. We made certain that the Kerr Constant of nanostrutured chiral LC composites was closely related to the parameters of their host LCs, such as value of the difference of refractive index (Δn), the dielectric anisotropy (Δe), and bend to splay elastic Constant ratio (K33∕K11).
