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:
Dec. 24, 2013
Filed:
Sep. 30, 2010
Brian Michael King, Santa Cruz, CA (US);
Omar Leung, Palo Alto, CA (US);
Paul G. Puskarich, Palo Alto, CA (US);
Jeffrey Traer Bernstein, San Francisco, CA (US);
Andrea Mucignat, Burlingame, CA (US);
Avi E. Cieplinski, San Francisco, CA (US);
Muhammad U. Choudry, Mississauga, CA;
Praveen R. Subramani, San Diego, CA (US);
Marc J. Piche, Waterloo, CA;
David T. Amm, Sunnyvale, CA (US);
Duncan Robert Kerr, San Francisco, CA (US);
Brian Michael King, Santa Cruz, CA (US);
Omar Leung, Palo Alto, CA (US);
Paul G. Puskarich, Palo Alto, CA (US);
Jeffrey Traer Bernstein, San Francisco, CA (US);
Andrea Mucignat, Burlingame, CA (US);
Avi E. Cieplinski, San Francisco, CA (US);
Muhammad U. Choudry, Mississauga, CA;
Praveen R. Subramani, San Diego, CA (US);
Marc J. Piche, Waterloo, CA;
David T. Amm, Sunnyvale, CA (US);
Duncan Robert Kerr, San Francisco, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Compensation for signal drift in a touch and hover sensing device is disclosed. A touch and hover sensing device can include a sensing panel to sense an object touching or hovering over the panel, a grounding device to periodically interact with the panel, and a control system to measure capacitance of the panel when the grounding device interacts with the panel, where the measurement captures any signal drift in the panel, and to set the measurement as a new baseline capacitance of the panel. Alternatively, the touch and hover sensing device can forgo the grounding device and configure the control system to measure capacitance of the panel either when there has been no touching or hovering object or when there is a substantially stationary touching or hovering object at the panel for a determinative time period, where the measurement captures any signal drift in the panel, and to set the measurement from this time period as the new baseline capacitance. The control system can apply the new baseline capacitance to touch and hover measurements so as to compensate for the signal drift.