The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2002
Filed:
Mar. 29, 2000
Robert H. Nathan, Atlanta, GA (US);
NCR Coporation, Dayton, OH (US);
Abstract
A system and method compensates for drift in electronic touch screens. A plurality of touch areas and drift areas are defined for a touch screen. From location coordinates generated by the screen, a ratio between detected touch hits in each defined touch area and detected touch hits in each corresponding drift area is computed. The computed ratio is compared to a calibration threshold to determine whether the number of touch hits in the drift area are excessive. If they are, a correction vector for all or a portion of the screen may be computed and used to adjust subsequent location coordinates or a calibration signal may be generated. The calibration signal may be a data message transmitted to a remote site to indicate a service call is required at the site of the touch screen and computer. Preferably, the system includes a location adjustor that determines whether the adjustment vectors for a plurality of keypad areas have a corresponding direction and magnitude. If they do, the location adjustor adjusts the definition of the touch and drift areas in the keypad memory.