CROSS-REFERENCE TO RELATED APPLICATIONS

摘要

One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface (304) by determining displacement of optical features in a succession of images of the surface (304) . The sensor includes a plurality of linear comb arrays (LCAs) (502) arranged along an associated axis. Each LCA comprises a row of photosensistive elements parallel to the associated axis. Another embodiment relates to a method of sensing movement of a data input device across a surface (304). An intensity pattern of light reflected from an illuminated portion of the surface (304) is detected using a first plurality of linear comb arrays (LCAs) arranged along a first axis and a second plurality of LCAs arranged along a second axis not parallel to the first axis. Other embodiments are also described.