Nondestructive graphic cursors and light-pen tracking on AC gas-discharge display panels

Interactive graphic displays need a displayed cursor such as a cross-hair to provide the system user with feedback of the system's point of attention. It has proven difficult to provide a movable cursor on ac gas-discharge displays without regenerating the original image each time the cursor is moved. This paper presents a new technique for displaying nondestructive cursors of various forms on gas panels and for high-speed automatic light-pen detection and tracking.