標題: Dielectric characterization and voltage holding ratio of blue-phase cells
作者: Wu, Po-Chang
Hsu, Hsuan-Tsung
Chen, Hsin-Li
Lee, Wei
光電學院
College of Photonics
關鍵字: Blue phase liquid crystals;Dielectric spectroscopy;Voltage holding ratio
公開日期: Sep-2016
摘要: The phase behaviors of a blue-phase (BP) liquid crystal in a planar-aligned cell were investigated by means of temperature-dependent dielectric spectroscopy. With auxiliary observations of optical transmission spectra and birefringent textures, we found that the transition temperatures of two adjacent mesophases, including the cholesteric-to-BPI, the BPI-to-BPII, and the BPII-to-isotropic, can clearly be distinguished by the first and second derivatives of the real-part dielectric permittivity function to the temperature at a specific frequency. Furthermore, an attempt to evaluate the device performance of a polymer-stabilized BP, derived from the photopolymerization of two monomers (R1V1257 and TMPTA), was achieved with a new circuital design for the voltage-holding-ratio (VHR) measurement. Preliminary results of the VHRs of samples at 180 Hz and their temperature dependence were obtained accordingly. (C) 2015 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.displa.2015.11.003
http://hdl.handle.net/11536/136170
ISSN: 0141-9382
DOI: 10.1016/j.displa.2015.11.003
期刊: DISPLAYS
Volume: 44
起始頁: 66
結束頁: 72
Appears in Collections:Conferences Paper