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:
Jan. 07, 2014
Filed:
Jan. 07, 2011
Ashutosh Ravindra Joharapurkar, Karnataka, IN;
Karthikeya Kodur, Karnataka, IN;
Venugopal Reddy, Karnataka, IN;
Patrick Chan, Sunnyvale, CA (US);
Ashutosh Ravindra Joharapurkar, Karnataka, IN;
Karthikeya Kodur, Karnataka, IN;
Venugopal Reddy, Karnataka, IN;
Patrick Chan, Sunnyvale, CA (US);
Maxim Integrated Products, Inc., San Jose, CA (US);
Abstract
A touchscreen controller system determines the actual locations of multiple simultaneous touches by eliminating mutual capacitance between adjacent rows and columns during self-capacitance measurements and selectively enabling mutual capacitance during mutual capacitance measurements. During the self-capacitance measurements, the controller system generates a set of candidate touch locations, which includes the locations of real and ghost touches. During the mutual capacitance measurements, only the locations in the candidate set are measured and, from these measurements, the actual touch locations are determined. By limiting the mutual capacitive measurements to only a small subset of the locations over the entire touch panel, real touch locations are determined on a linear order. Also, by using on-chip integration capacitors, embodiments of the invention are able to perform each measurement in a single cycle.