| Since1890s, Liquid crystal (LC) was discovered by Reinitzer,a botanist, a large number of scientists in variety of fields discovered liquid crystalline state and did a depth research. Liquid crystal(LC), which has been widely applied to modern industrial production,which boom an unprecedented upsurge of the research for application technology of LCD, especially the popular of liquid crystal display (LCD) in the world, which eause a big change in display industry, then more higher standard for LCD technology were appeared, so the law and property of phase transition of liquid crystalline in electric field has became hotspot in research for many scientists.In this paper, firstly, we analyze theoretical the reason of phase transition in the liquid crystal in external field;secondly, we summarize current situation, achievements and bottlenecks of the research of spatiotemporal chaos research, analyze and compare these theories, and then based on these theories we propose an theoretical analysis method applied to the liquid crystal phase transition-a spatiotemporal correlation function and the image processing algorithms using local spectrum method. Then we designed and performed the experiment of "Spatiotemporal chaotic pattern evolution and phase transition liquid crystal under AC driving". According to the data obtained from our observation, we summarized the evolution tendency of LD patterns in different phases under different amplitude and frequency of electric field qualitatively. Then we calculated the spectrums of the LD pattern, the distribution of the azimuthal angle of the patterns, spatiotemporal correlation and some other relative parameters to quantitatively describe the rules of pattern evolution under electric driving with certain amplitudes and frequencies. In addition, we also summarized the formation of LC patterns in different driving conditions, such as different amplitude, different frequency, changing driving signal as well as different kinds of periodic driving. |
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