Due to the bi-stable nature of interferometric modulator elements, the state of each modulator element may be held at either an actuated or a released state with a common voltage difference. Because modulator elements often require less time to change states than is allotted in a line time, power drawn...http://www.google.co.uk/patents/US20060066594?utm_source=gb-gplus-sharePatent US20060066594 - Systems and methods for driving a bi-stable display element
