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. 24, 2012
Filed:
Oct. 07, 2009
Ronald F. Cormier, Jr., Tucson, AZ (US);
Michael D. Snedeker, Tucson, AZ (US);
Ronald F. Cormier, Jr., Tucson, AZ (US);
Michael D. Snedeker, Tucson, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A capacitance measuring system includes analog-digital circuitry () coupled to row conductors () and column conductors () of a touch screen panel (A) for producing a first digital signal (DATA) representative of cross-coupling capacitances (C). Row drive circuitry () superimposes charge transfers from cross-coupling capacitances of the row conductors to a first column conductor to cause the first digital signal to be a convoluted signal. Calibration circuitry () subtracts base line data from the first digital signal to produce a second digital signal (ΔDATA) representing touch-induced capacitance change values (ΔC). A deconvolution circuit () deconvolutes the second digital signal to produce a digital output () representing a magnitude map of the touch-induced capacitance change values.