Patent ID: 8089677

Claim:
A dynamic optical grating device comprising: an array of pixels, each pixel comprising an active media material configured to control an optical phase and an intensity of light passing through each pixel upon application of an electric or magnetic field, wherein the optical phase and the intensity of light passing through each pixel is controlled such that the collective light from a plurality of the pixels forms constructive or destructive interference at one or more target points; and electrical circuitry configured to apply a desired electric or magnetic field to the pixels wherein the electrical circuitry comprises, first and second pluralities of substantially parallel conductive electrodes, each plurality on an opposite side of the pixel array, the first plurality being substantially perpendicular to the second plurality; wherein each electrode of the first plurality is configured to apply a voltage to a different column of pixels and each electrode of the second plurality is configured to apply a voltage to a different row of pixels such that one electrode of the first plurality and one electrode of the second plurality together apply a desired voltage to one pixel.