Hui-ming HAO, Ping ZHANG, Han-qing ZHANG, et al. Influence of temperature on the capacitance of liquid crystal cell[J]. Chinese journal of liquid crystals and displays, 2016, 31(8): 755-759.
DOI:
Hui-ming HAO, Ping ZHANG, Han-qing ZHANG, et al. Influence of temperature on the capacitance of liquid crystal cell[J]. Chinese journal of liquid crystals and displays, 2016, 31(8): 755-759. DOI: 10.3788/YJYXS20163108.0755.
Influence of temperature on the capacitance of liquid crystal cell
The capacitance of liquid crystal cell is associated with the value of external applied voltage. When the temperature of the liquid crystal is changed
the capacitance of liquid crystal cell will also change even if the applied voltage has a certain value. In order to research the influence of temperature
adopting the method of alternating current (AC) bridges
the capacitance of parallel aligned nematic (PAN) liquid crystal cell filled in liquid crystal 5CB is measured experimentally
where the precision hot stage (LTS350
Linkam) is used to control the temperature of liquid crystal cell. The voltage-capacitance characteristic curves of PAN cell for different temperatures are obtained. Within the scope greater than the threshold voltage
with the increasing of temperature the capacitance of PAN cell increases gradually under the same voltage and the curve slope is gradually reduced
which suggests that LC transforms gradually into the isotropic state. The study has certain guiding significance on further analyzing the dielectric constant of liquid crystal material.
关键词
Keywords
references
MORRIS S W. Measurements of the elastic constants of a liquid crystal[D]. Vancouver: University of British Columbia, 1985.
YANG D K, WU S T. Fundamentals of Liquid Crystal Devices [M]. Chichester: John Wiley & Sons Ltd, 2006.
NASTISHIN Y A, POLAK R D, SHIYANOVSKII S V, et al . Nematic polar anchoring strength measured by electric field techniques[J]. Journal of Applied Physics , 1999, 86(8): 4199-4213.
YE W J, LIU X S, SONG X L, et al . Influence of anchoring property of substrate on capacitance of crystal cell[J]. Chinese Journal of Liquid Crystals and Displays , 2014, 29(5): 686-691. (in Chinese)
SONG X L, YE W J, XING H Y, et al . Influence of elastic constants on the capacitance of liquid crystal cell[J]. Journal of Hebei University of Technology , 2016, 45(2):92-95. (in Chinese)
KONG X J, JING H, HUANG X, et al . Theoretical research of improved C-V method to measure k 11 and k 33 of nematic liquid crystals[J]. Chinese Journal of Liquid Crystals and Displays , 2007, 22(5): 587-590. (in Chinese)
WELFORD K R, MINERS F, SAMBLES J R. A new technique for determining the dielectric constants of a nematic liquid crystal[J]. Journal of Physics D: Applied Physics , 1988, 21(9): 1320-1325.
CUI W J, XING H Y, ZHANG Y J, et al . Influence of the flexoelectric effect on the capacitance of nematic liquid crystal cell[J]. Journal on Numerical Methods and Computer Applications , 2012, 33(2): 129-137. (in Chinese)
YE W J, XING H Y, CUI W J, et al . Determining the sum of flexoelectric coefficients in nematic liquid crystals by the capacitance method[J]. Chinese Physics B , 2014, 23(11): 116101.
YE W J, SONG X L, XING H Y, et al . Experimental measurement of capacitance liquid crystal cell[J]. Experimental Technology and Management , 2015, 32(9): 38-41. (in Chinese)
黄子强.液晶显示原理[M].2版.北京:国防工业出版社, 2008.
HUANG Z Q. Principle of Liquid Crystal Display [M]. 2nd ed. Beijing: Natural Defense Industry Press, 2008. (in Chinese)