06972401 is referenced by 196 patents and cites 25 patents.

A passive touch system includes a touch surface and at least one source of backlight illumination projecting backlighting across the touch surface. At least two image sensors are associated with the touch surface and acquire images of the touch surface from different locations. A digital signal processor is associated with each image sensor. The digital signal processors select pixel subsets of images acquired by the image sensors and process pixel data acquired by the selected pixel subsets to generate pointer characteristic data when a pointer exists in the acquired images. A master digital signal processor in communication with the digital signal processors triangulates the pointer characteristic data to determine the location of the pointer relative to the touch surface.

Title
Illuminated bezel and touch system incorporating the same
Application Number
10/354168
Publication Number
6972401 (B2)
Application Date
January 30, 2003
Publication Date
December 6, 2005
Inventor
Gerald D Morrison
Calgary
CA
Neil Gordon Bullock
Calgary
CA
Trevor M Akitt
Calgary
CA
Agent
Katten Muchin Rosenman
Assignee
Smart Technologies
CA
IPC
H01J 040/14
View Original Source