Patent ID: 8908254

Claim:
Optical apparatus for a display device, wherein said optical apparatus comprises: a) a cavity; b) a first fluid and a second fluid, held within said cavity, which are immiscible with each other, said first and second fluids being separated from each other by a meniscus having a peripheral edge, said peripheral edge having a first part and a second different part; c) a fluid motion control system arranged to control movement of said first and second fluids within said cavity using electrostatic forces; and d) a first surface and a second surface, said first surface having a different wettability for said first fluid than said second surface, wherein said first and second surfaces are arranged in said cavity to determine, upon activation of the fluid motion control system, a motion of said fluids within said cavity which always has an initiation at said first part of said peripheral edge before initiation of motion of said fluids occurs at said second different part of said peripheral edge.