Patent ID: 7310180

Claim:
A capacitive micro electro-mechanical systems (MEMS) device comprising: a bottom electrode formed over a substrate; a movable member serving as a top electrode, the movable member being configured to deflect towards the bottom electrode by electrostatic force to modulate incident light, the movable member comprising a reflective material formed over a resilient material; and a dielectric spacer formed over the bottom electrode, the dielectric spacer having a thickness at least half a distance between a bottom surface of the movable member and a top surface of the bottom electrode, the dielectric spacer being separated from the bottom surface of the movable member by a gap; wherein the dielectric spacer has a thickness of 2G/3 scaled according to a dielectric constant of the dielectric spacer, where G is the distance between the bottom surface of the movable member and the top surface of the bottom electrode.