Patent ID: 7646528

Claim:
A mirror device which deflects incident light, comprising: a mirror arranged on a substrate and supported by a hinge; a first address electrode and a second address electrode disposed on opposite sides across said hinge on said substrate for deflecting the mirror to an ON state, an OFF state, or an oscillating state; a drive circuit applying a plurality of voltage pulses to the first address electrode and the second electrode for controlling said mirror to continuously oscillate at a specific oscillation frequency in a controlled time period within a display frame period between said first address electrode and second address electrode serving also as a first stopper and a second stopper respectively wherein said mirror further projects a reflection light having an intermediate light intensity in said controlled time period within said display frame period to an image projection lens wherein the intermediate light intensity is a partial portion of a full light intensity reflected from said mirror to said image projection lens when said mirror is operated in the ON state; and said drive circuit controls the intermediate light intensity by adjusting said oscillation frequency in said controlled time period within said display frame period and said plurality of voltage pulses.