Highlights
"Ideal Liquid Crystal Display Mode Using Achiral Banana-Shaped Liquid Crystals"
Y. Shimbo,Y. Takanishi, K. Ishikawa, E. Gorecka, D. Pociecha, J. Mieczkowski, K. Gomola, H. Takezoe, Jpn. J. Appl. Phys. 45 (2006) L282-L284.
We have developed an ideal display mode using a banana-shaped liquid crystal (Fig. 1(a)). We fabricated homeotropically aligned cells of the SmA-like phase and applied in-plane electric field. Molecules switch ferroelectrically (Fig. 1(b), (c)). This display mode has all the advantages of the existing display modes; high contrast ratio of VA (vertical alignment) mode, wide viewing angle of IPS (in-plane switching) mode, fast response (100 μs) of FLC (ferroelectric liquid crystal) and Principle of the display mode. AFLC (antiferroelectric liquid crystal) modes, gray level of V-shaped switching (Fig. 2). In order to understand the principle of this switching characteristics, SHG was measured as a function of an electric field. The result was analyzed based on two-dimensional Langevin process. We found that about 150 molecules switch cooperatively. In this way, the present display mode is unique because of the use of quasi-long-range order of molecular dipoles, which originates from close packing of bent-core molecules. |
Fig. 1 (a) Molecular structure used. (b), (c) of FLC (ferroelectric liquid crystal) and Principle of the display mode.
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