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:
Jul. 28, 2009
Filed:
May. 31, 2005
Richard A. Peterson, Jr., Chelmsford, MA (US);
Bulent Bulat, Framingham, MA (US);
Bruce A. Lessard, Salem, MA (US);
Gordon F. Taylor, Bolton, MA (US);
Richard A. Peterson, Jr., Chelmsford, MA (US);
Bulent Bulat, Framingham, MA (US);
Bruce A. Lessard, Salem, MA (US);
Gordon F. Taylor, Bolton, MA (US);
3M Innovative Properties Company, Saint Paul, MN (US);
Abstract
The present invention provides systems and methods for detecting stray capacitance in capacitive touch sensors. The existence of stray capacitance can lead to errors in touch detection and touch position determination. Such errors can be avoided or corrected when the stray capacitance is detected. Detecting stray capacitance includes analyzing signals for features characteristic of stray capacitance noise events. Such features can include spatial features such as the location of a test touch position determined from signals caused by stray capacitance, as well as temporal features such as the rate of change of the detected signals.