Pulsed addressing of a dual-frequency nematic liquid crystal.
Pulsed addressing of a dual-frequency nematic liquid crystal.
复制标题
双频向列液晶的脉冲寻址。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
C. V. Brown
中科院分区：
文献类型：
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作者：
N. Mottram;C. V. Brown
描述了液晶材料内介电弛豫的连续介质理论，并用于模拟双频材料对单脉冲电压波形的响应。控制各向异性轴（导演）的角度，电场，和诱导的偏振方程数值求解研究脉冲寻址的一个模型zenithally液晶器件。通过适当地定制电压脉冲，发现可以在两个双稳态之间切换。对于短脉冲，电压脉冲前沿的高频分量激发垂直极化，并迫使指向矢平行于电池基板。对于较长的电压脉冲，电压脉冲的恒定直流分量激发平行极化，导致指向矢垂直于衬底。还发现，降低旋转粘度和增加可实现的介电各向异性（特别是高频值）可以显着降低这样的设备的工作电压。
A continuum theory of dielectric relaxation within liquid crystal materials is described and used to model the response of dual frequency materials to single pulse voltage waveforms. The equations governing the anisotropic axis (director) angle, electric field, and induced polarizations are solved numerically to investigate pulsed addressing of a model zenithally bistable liquid crystal device. By suitably tailoring the voltage pulse, it is found to be possible to switch between both bistable states. For short pulses the high frequency components of the leading edge of the voltage pulse excites the perpendicular polarization and forces the director to lie parallel to the cell substrates. For longer voltage pulses the constant dc component of the voltage pulse excites the parallel polarization causing the director to lie perpendicular to the substrates. It is also found that reducing rotational viscosity and increasing the achievable dielectric anisotropies (particularly the high frequency value) can significantly reduce the operating voltages of such a device.