Cell Substrates Research Articles

Phase Retardation Difference of Liquid Crystal Cells with Symmetric and Asymmetric Boundary Conditions

Phase retardation ΔΦ values for the LC cells with homogeneous and inhomogeneous LC director distribution vs. the LC pretilt angle θ0 on the cell's substrates has been simulated. Cases of symmetric and hybrid cells with both positive and negative optical anisotropy LC with θ0 values in the range from 0 to 90° and θ0 > 90° are reviewed.

P‐123: Oblique Light Incidence onto Hybrid Aligned Nematic (HAN) Cells for Optical Compensators

AbstractDesign and fabrication methods of HAN cells with arbitrary LC pretilt angle value are described. Phase retardation △Φ values for the hybrid LC vs. the LC pretilt angles θ0(1), θ0(2) on the opposite cell's substrates are calculated for arbitrary light incidence angle. LC director configuration is suggested for its application in optical compensators. LC pretilt angle value is measured in the HAN cells with given planar or vertical LC alignment on one of the substrates.

P.90: Optical Properties of LC Cells with Hybrid Orientation and Negative Birefringence

AbstractPhase retardation ΔΦ values for the LC cells with homogeneous and inhomogeneous LC director distribution vs the LC pretilt angle θ0 on the cell's substrates, namely for hybrid cells with different LC pretilt angles at every substrate and films with negative optical anisotropy materials.

Measurement of the liquid crystal pretilt angle in cells with homogeneous and inhomogeneous liquid crystal director configuration

Optical and electro-optical methods of liquid crystal (LC) director pretilt angle measurement are described for LC cells with homogeneous and inhomogeneous LC director distribution. The LC pretilt on both LC substrates can have the same or opposite direction. The phase retardation difference of both extraordinary and ordinary polarized rays passing through an LC cell with homogeneous and inhomogeneous LC director distribution has been calculated versus the LC pretilt angle θ(0) on the cell's substrates in the range 0≤θ(0)≤90°. The experimental procedure for phase retardation difference determination by measurement of the LC cell transmission between crossed polarizers for cells with LC tilted alignment is described. The method developed can also be used in optical compensator design.