| 초록 |
Except for rubbing technique, there are several methods. From the experimental point of view, SiO obliquely evaporated films and Langmuir-Blodgett(LB) films seem to be suitable for the alignment of SSFLC, since the anchoring strength of these alignment films has been measured in the nematic phase and estimated to be weak. The switching behavior of FLC is dependent on the anchoring force of alignment layer. It was assumed that when the surface anchoring strength is weakened, the surface FLC molecules can switch smoothly to realize uniform switching. So, in this work, polyimide(PI) LB film as an alignment layer of FLC was prepared at different condition and its optimum condition as FLC alignment layer was investigated. It is the objective to study the surface characteristics of PI LB film for the alignment of FLC.In the measurement of contact angle, as the transferred layer number, surface pressure, and curing temperature were increased, it could be known that the surface became hydrophobic compared with bare ITO surface, which was due to the effects of polyimide. At the result of investigation of LB films on Si-wafer, it could be known that the surface roughness was decreased as the transferred number of layer was increased, and in the case of treatment with rubbing on the surface of LB film scratches to the rubbing direction were produced. In the measurement of defects of LB films on the ITO surface using redox reaction, defects were decreased as the transferred layer was increased.
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