Dielectric characterization and voltage holding ratio of blue-phase cells

Po Chang Wu, Hsuan Tsung Hsu, Hsin Li Chen, Wei Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations


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 (RM257 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.

Original languageEnglish
Pages (from-to)66-72
Number of pages7
StatePublished - 1 Sep 2016


  • Blue phase liquid crystals
  • Dielectric spectroscopy
  • Voltage holding ratio

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