Patent ID: 8115987

Claim:
An optical device comprising: an at least partially optically transmissive first surface; an optical stack spaced from the first surface, the optical stack comprising a reflective first layer, a partially reflective, partially transmissive second layer, wherein the reflective first layer has a greater thickness than the partially reflective, partially transmissive second layer, and a dielectric third layer that separates and supports the first and second layers in a fixed relationship with respect to one another to create an optically resonant cavity between the first and second layers, the optical stack adapted to reflect light having a set of wavelengths determined by interference of light reflected from the first layer and from the second layer; a first fluid between the first surface and the optical stack; and a second surface between the first surface and the optical stack, the first fluid covering a first portion of the second surface when a first voltage is applied to the device, and the first fluid covering a second portion of the second surface when a second voltage is applied to the device.