A CMOS motion detector system for pointing devices

A motion detector system uses an array of 93 photodiodes integrated along with processing circuits to detect the motion of a printed random pattern on a bail used in a pointing de,ice application. It is based on the detection and tracking of spot edges passing over a matrix of pixels during the period between two light pulses. Motion in x and y directions is estimated bg aggregating local information about moving edges over the photosensitive pixels. The 4.4 x 4.3 mm(2) chip detects the hall motion from 0 to 11.8 in/s with a resolution higher than 800 dpi over a 100-2000 mW/m(2) light-intensity range.