Several electrooptical modes of liquid crystal for shutter and display applications were investigated. In the first part, optical response of a nematic liquid crystal cell at splay-bend transition was investigated. A simplified approach was used to study the dynamics of optical response at the splay-bend transition that occurs after applying the voltage across the NLC cell. The simulation results for the transmittance were obtained by solving the dynamic equations of the model numerically. The response time characterizing the rate of change of the transmittance was evaluated to study how the parameters of the cell influence the dynamics of optical response. Dependencies of the response time on the dielectric anisotropy parameter and on the flexoelectric coefficient were found to be stro...[ Read more ]

Several electrooptical modes of liquid crystal for shutter and display applications were investigated. In the first part, optical response of a nematic liquid crystal cell at splay-bend transition was investigated. A simplified approach was used to study the dynamics of optical response at the splay-bend transition that occurs after applying the voltage across the NLC cell. The simulation results for the transmittance were obtained by solving the dynamic equations of the model numerically. The response time characterizing the rate of change of the transmittance was evaluated to study how the parameters of the cell influence the dynamics of optical response. Dependencies of the response time on the dielectric anisotropy parameter and on the flexoelectric coefficient were found to be strongly non-monotonic.

In the second part, the potential application of fast and high contrast liquid crystal shutters with low power consumption based on OMI-cell was investigated. Three electrooptical modes of liquid crystal were studied. Theoretical analysis and dynamics of optical response of LC under the specific driving scheme were demonstrated. A new application of 180° OMI cell for liquid crystal shutters was predicted in theory. Based on the simulation, three prototypes of LC have been made for verification. The experimental results show good agreement with the simulation outcome. The prototype using 180° OMI cell exhibits high contrast ratio and fast response with low power consumption under dynamic driving.

In the last part, a new double cell achromatic ferroelectric liquid crystal display was investigated. A new structure of FLC display which contains two identical cells with perpendicular directors was proposed. In simulation, it was demonstrated that a perfect contrast can be obtained at black-white switching in transmissive mode using double cell configuration. A satisfactory contrast can also be achieved in reflective mode, regardless of the individual cell gap of single cell. The later experiments proved this idea very well.