 With increasing voltage and current, the electric field is trying to align the long molecular axis of the LC perpendicular to the field while the ion transport through the layer has the tendency to align the LC perpendicular to the substrate plates.As a result, a striped repetitive pattern is generated in the cell, of which the building blocks are named "Williams domains".Upon further increase of the voltage this regular pattern is replaced by a turbulent state which is strongly scattering light.