不同形貌Ni颗粒对向列相液晶电光性能的影响

将不同形貌的Ni颗粒(类碗状Ni颗粒、Ni花颗粒和Ni球颗粒)掺杂在液晶中制备了扭曲向列相(TN)液晶显示模式液晶盒,采用液晶综合参数测试仪对掺杂不同形貌Ni颗粒的向列相液晶(NLC)显示模式液晶盒的阈值电压、饱和电压、对比度及响应时间进行了研究。结果表明,掺杂Ni颗粒后,液晶的电光性能得到明显改善,阈值电压、饱和电压均有所降低,对比度明显增大,响应时间下降。其中类碗状Ni颗粒改善效果最为明显,驱动电压降幅达到13.77%,对比度增大35.55%,响应时间降低至9.390 ms。Ni颗粒的形貌及比表面积对液晶的电光性能有很大影响。比表面积及曲率大的Ni颗粒对液晶电光性能的改善效果好。

Effects of Ni particles with different morphologies on electro-optical properties of nematic liquid crystal

Twisted nematic (TN) liquid crystal display mode cells doped with different Ni particles were prepared, such as Ni bowls-like particles, Ni flowers particles and Ni spheres particles. The effects of different Ni particles on the threshold voltage, saturation voltage, contrast ratio and response time of nematic liquid crystal (NLC) display mode cells were investigated with a liquid crystal display parameters tester. It is found that the addition of Ni particles with different morphologies decrease the threshold voltage and the saturation voltage, increase the cantrast ratio and reduce the response times significantly. Especially, the TN cells doped with the Ni bowls-like particles have the best properties, the driving voltage could be reduced by 13.77%, the contrast ratio increases by 35.55% and response times decreases to 9.390 ms. The experiments indicate that the different shapes, structures and surface area of Ni particles have obvious effects on the electro-optical properties of liquid crystals. The larger the surface areas and the curvature of the bowls-like shape are, the better the electro-optical properties are.