Patent ID: 7247835

Claim:
An optical navigation device, comprising: a light source to produce light for illuminating a surface; an optical navigation sensor to receive light reflected from the surface, the light reflected from the surface being initially produced by the light source, and the optical navigation sensor having: a silicon substrate having a plurality of photo-sensing regions, each of which receives a portion of the light reflected from the surface, and each of which provides a pixel of navigation information; at least one layer of material that was deposited on the photo-sensing regions of the silicon substrate during a silicon wafer fabrication process, wherein each of the at least one layer of material has a thickness that causes the layer of material to serve as an anti-reflection coating and reduce a percentage of light that is reflected away from the photo-sensing regions of the silicon substrate to less than 30%; and a circuit to bias each of the photo-sensing regions with a current, the current providing a given responsivity, and the current being less than a current that would be required to provide the given responsivity absent the at least one layer of material.