Apparatus for driving a cholesteric liquid crystal display wherein the
display includes cholesteric liquid crystals having a first planar
reflective state and a second transparent focal conic state, which is
respectively responsive to different applied fields. The apparatus
further includes an addressing structure having rows and columns of
conductors arranged so that when a column and a row overlap, they define
a selectable pixel or segment to be viewable or non-viewable, and a
single drive chip responsive to a single input voltage for applying
selected voltages to rows and columns of conductors, so that selectable
unipolar fields are applied across the cholesteric liquid crystals of the
pixels to selectively change the state of the cholesteric liquid crystal.