Patent ID: 6961036

Claim:
A driving method for a display comprising a first substrate, a second substrate and a cholesteric liquid crystal sealed between the first and second substrate, wherein pixels are defined by common and segment lines respectively on the first and second substrate, the method comprising the steps of: selecting one of the pixels by applying a first signal switching between a ground and a first voltage level to the common line of the selected pixel; driving the selected pixel into a reflecting state by applying a second signal out of phase with the first signal and that switches between a second and third voltage levels to the segment line of the selected pixel; driving the selected pixel into a transparent state by applying a third signal in phase with the first signal and that switches between the second and third voltage levels to the segment line of the selected pixel; and deselecting one of the pixels by applying a fourth signal fixed at a fourth voltage level to the common line of the unselected pixel; wherein the first, second, third and fourth voltage levels have the same polarity based on the ground voltage level, and magnitudes such that a waveform of a differential voltage signal between the segment and common line generated thereby in each pixel is centered at the ground voltage level.