Dynamic behaviors of dual frequency liquid crystals in bistable chiral tilted-homeotropic nematic liquid crystal cell

Abstract

The switching behaviors of dual frequency liquid crystals (DFLC) in a bistable chiral tilted-homeotropic nematic (BHN) LC cell are simulated and compared with the observed results. This cell can be switched between tilted-homeotropic state and twisted state under the applied voltage as low as 5V. The reason for the low switching voltage is attributed to the dielectric anisotropy character of DFLC. The analysis also shows that the switching wave form accelerates the switching behaviors of the directors which results in faster response in BHN LC cell.

Subnanowatt Opto‐Molecular Generation of Localized Defects in Chiral Liquid Crystals

“…This is made possible since the fi lm is provided with transparent electrodes at both ends, which allows to relieve frustration by applying a 100 kHz low-voltage electric fi eld (a few Volts) owing to a negative dielectric anisotropy ( a ⑀ 3.4 = − [ 32 ] ) that tends to reorient the director in the plane of the fi lm. Similarly to the case of optical reorientation, we observe the spontaneous electrical generation of a large number of randomly distributed distinct metastable defect structures across the sample.…”

Low-Power Displays With Dye-Doped Bistable Chiral-Tilted Homeotropic Nematic Liquid Crystals

“…Immediate agitation by a 10 V , 100 kHz pulse holds the system in the absorbing bT state, and after releasing the field one obtains the tT state with roughly the same absorbance. Detailed switching mechanism and physical explanation can be found in [9]. Fig.…”

“…Utilizing dual-frequency LC, BHN is capable of switching between the tilted homeotropic state (tH) and tilted twist state (tT) when the cell configuration is optimized with around one and the pretilt angle around 70 [8], [9]. While both the tT and tH states can stay at their configurations at zero applied voltage, the other two possible states are the biased twist (bT) and biased homeotropic (bH) states, which are sustainable under biased voltage.…”

Dual‐mode liquid crystal devices with switchable memory and dynamic modes

“…The simulator, which was originally developed at NCTU LC Laboratory, was modified at FCU LC Laboratory to determine the director behavior of DFLC [10,11]. In the previous studies conducted by these researchers, the helical twist direction temporarily switched to the opposite direction due to the flow-induced tip-over effect during the relaxation from the high-tilt bend state to the π-twist state.…”