Dual frequency liquid crystals: a review

Thermodielectric bistability in dual frequency nematic liquid crystal.

We report on a thermodielectric bistability in dual frequency nematic liquid crystals (LCs) caused by the anisotropic nature of dielectric heating and director reorientation in an electric field. The bistability is a result of the positive feedback loop: director reorientation --> anisotropic dielectric heating --> dielectric anisotrophy --> director reorientation. We demonstrate both experimen...

P-130: Large-Cell-Gap Bistable TN-LCD Based on Dual-Frequency Operation

A bistable twisted nematic liquid crystal display based on dual frequency driving electronics has been demonstrated. By using special combinations of alignment layers and liquid crystals, bistability can be achieved readily with cell gaps as large as 5μm.

Fast, large and controllable phase modulation using dual frequency liquid crystals.

We report on a method for high speed, large stroke phase modulation using dual frequency control of liquid crystals. Our system uses an all-electronic feedback system in order to simplify the control. We show half wave phase modulations of ~120Hz with the operating point varying over nearly the full dynamic range of the device, and demonstrate larger phase shifts (2.5 waves) at a frequency of 3...

Dielectric torque and orientation dynamics of liquid crystals with dielectric dispersion.

We demonstrate that the finite rate of dielectric relaxation in liquid crystals which has been ignored previously causes profound effects in the fast dielectric reorientation of the director. We propose a theory of dielectric response in which the electric displacement depends not only on the present (as in the standard theory) but also on the past values of electric field and director. We desi...

High birefringence phenyl tolane positive compounds for dual frequency liquid crystals