| Summary: | 碩士 === 中原大學 === 物理研究所 === 106 === The polymer dispersed liquid crystal (PDLC) film has not been widely used due to its high operating voltage. We doped zinc oxide (ZnO) nanoparticles (NPs) into the conventional PDLC film, replaced typical LC E7 with high di-electric anisotropy LC (HTW106700 - 100, HTW), and exchanged polymer with gelator. Our goal is to achieve a low operating voltage and high contrast ratio of PDLC film.
We fabricated ZnO NPs in ethanol and doped them into PDLC films. We have successfully reduced threshold and driving voltages, and kept high contrast ratio when the concentration of ethanol and ZnO NPs are 15 wt% and 1.5 wt%, respectively.
When replacing LC E7 with HTW in PDLC films, the optimized concentration of HTW and polymer are 35 wt% and 65 wt%, respectively. We effectively decreased the driving voltage from 1.27 V/μm to 0.41 V/μm. The highest contrast ratio is achieved at UV curing light intensity of 2600 μW/cm².
In order to reduce the threshold and driving voltages of PDLC film, we manufactured the films with scattering property by using liquid crystal HTW and gelator. Compared with the conventional PDLC film, the operating voltage of the new films are obviously reduced. However, the contrast need to be further improved.
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