Parallax error avoidance for a touch screen system.

摘要

In a system using a touch panel type of overlay (12) on a cathode ray tube screen (10) wherein multiple areas (32-35) for user selection are presented on the tube screen, erroneous touch selection of displayed areas on the tube because of parallax-induced offset is avoided by assigning a guard band (36-39) around each display area. The width of the band is designed to correlate to the amount of parallax error associated with the combined tube and overlay touch screen environment.