The Electro-Optical Properties of Doping Aromatic Hydrocarbon Liquids in Twisted Nematic Liquid Crystals
Yen-Te Chiang1*, Tsu-Ruey Chou2, Chi-Yu Chao1,2
1Institute of Applied Physics, National Taiwan University, Taipei, Taiwan
2Department of Physics, National Taiwan University, Taipei, Taiwan
* presenting author:Yen-Te Chiang, email:ytchiang@phys.ntu.edu.tw
In this paper, doping liquid materials to enhance the electro-optical (EO) properties of twisted nematic liquid crystals (NLCs) was presented. Two aromatic hydrocarbon (AH) liquids, toluene and 1-methylnaphthalene, were chosen as dopants in order to lower the driving voltage and response time of the NLCs. A 18% decrease in driving voltage and response time was achieved by doping 10 wt% toluene into NLCs. The main reason of this phenomenon is due to a large amount of reduction in the rotational viscosity of AH liquids doped NLCs. This method provide a more easy and potential choice for applications in various LC display systems.


Keywords: nematic liquid crystals, aromatic hydrocarbon liquids, rotational viscosity, visco-elastic coefficient