Dielectric properties of liquid crystals for display and sensor applications

• Published in: Journal of the Society for Information Display Vol. 23; no. 9; pp. 403 - 409
• Main Authors: Belyaev, Victor V., Chausov, Denis N., Kurilov, Alexander D., Rybakov, Dmitriy O., Solomatin, Alexey S., Murauski, Anatoli A., Muravsky, Alexander A., Chigrinov, Vladimir G., Fan, Fan
• Format: Journal Article
• Language: English
• Published: Campbell Blackwell Publishing Ltd 01-09-2015; Wiley Subscription Services, Inc
• Subjects: anisotropy; combined LC orientation; dielectric spectroscopy; liquid crystals; temperature sensor
• ISSN: 1071-0922; 1938-3657
• DOI: 10.1002/jsid.352

Temperature dependence of dielectric properties of nematic liquid crystals are investigated for two types of devices: wide temperature range liquid crystal (LC) displays and capacitor temperature sensor. Both real and imaginary components of the dielectric constant have been measured in wide frequency and temperature range including t < 0 °C as well as versus the angle θ between the directions of both magnetic and electric field in the measuring scheme. Some physical parameters of the nematic LC (NLC) dielectric relaxation have been determined. Effective values of the LC dielectric permittivity with different values of the LC pretilt angles in different parts of a complex LC cell have been simulated.
Temperature dependence of nematic liquid crystal dielectric properties is investigated for wide temperature range liquid crystal displays and capacitor temperature sensor. Both real and imaginary components of the dielectric constant have been measured versus frequency and temperature. Some physical parameters of the nematic liquid crystal dielectric relaxation have been determined. Effective values of the liquid crystal dielectric permittivity with different values of the liquid crystal pretilt angles have been simulated.