System and method for detecting locations of touches on a touch sensor
First Claim
1. A method for determining a touch location of a projected capacitive touch sensor, comprising:
- providing a substrate with a plurality of non-overlapping areas, wherein each non-overlapping area includes a horizontal detection electrode in a first column and a second column with a plurality of vertical detection electrodes;
measuring a first mutual capacitance between the horizontal detection electrode and a vertical detection electrode from the plurality of vertical detection electrodes;
measuring a second mutual capacitance between the horizontal detection electrode and another vertical detection electrode from the plurality of vertical detection electrodes;
determining one or more horizontal detection electrode and vertical detection electrode combinations based on a change in the first mutual capacitance and the second mutual capacitance;
determining a digitized capacitance value based on the change in the first and the second mutual capacitances; and
determining the touch location based on a location of the one or more determined horizontal detection electrode and vertical electrode combinations and the digital capacitance value.
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Accused Products
Abstract
A projected capacitive touch sensor system includes a substrate that defines a plurality of non-overlapping areas. Each non-overlapping area includes a plurality of detection electrodes arranged in non-overlapping columns. The columns include a horizontal detection electrode that extends along substantially an entire height of a first column, and at least a second column of at least two vertical detection electrodes that are electrically isolated from one another. The system further includes a measuring circuit configured to measure a mutual capacitance between the horizontal detection electrode and each of the at least two vertical detection electrodes in a given area. A processing logic circuit of the system is configured to determine horizontal detection electrode and vertical detection electrode combinations that have a changed mutual capacitance. The processing logic is also configured to determine the touch location based on a location of the determined horizontal detection electrode and vertical electrode combinations.
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Citations
29 Claims
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1. A method for determining a touch location of a projected capacitive touch sensor, comprising:
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providing a substrate with a plurality of non-overlapping areas, wherein each non-overlapping area includes a horizontal detection electrode in a first column and a second column with a plurality of vertical detection electrodes; measuring a first mutual capacitance between the horizontal detection electrode and a vertical detection electrode from the plurality of vertical detection electrodes; measuring a second mutual capacitance between the horizontal detection electrode and another vertical detection electrode from the plurality of vertical detection electrodes; determining one or more horizontal detection electrode and vertical detection electrode combinations based on a change in the first mutual capacitance and the second mutual capacitance; determining a digitized capacitance value based on the change in the first and the second mutual capacitances; and determining the touch location based on a location of the one or more determined horizontal detection electrode and vertical electrode combinations and the digital capacitance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A touch sensor system, comprising:
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a substrate with a plurality of non-overlapping areas, wherein each non-overlapping area includes a horizontal detection electrode in a first column and a second column with a plurality of vertical detection electrodes; a measuring circuit configured to measure a first mutual impedance between the horizontal detection electrode and a vertical detection electrode from the plurality of vertical detection electrodes and to measure a second mutual impedance between the horizontal detection electrode and another vertical detection electrode from the plurality of vertical detection electrodes; and processing logic configured to; determine one or more horizontal detection electrode and vertical detection electrode combinations based on a change in the first mutual impedance and the second mutual impedance; determine a digitized capacitance value based on the change in the first and the second mutual impedances; and determine the touch location based on a location of the determined horizontal detection electrode and vertical electrode combinations and the digital capacitance value. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A touch sensor system, comprising:
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a substrate with a plurality of non-overlapping areas, where each non-overlapping area includes a plurality of detection electrodes, the plurality of detection electrodes configured in at least three columns and including; a horizontal detection electrode in a first column; P pairs of vertical detection electrodes that are electrically isolated from one another, wherein P is at least 2, and wherein the P pairs of vertical detection electrodes define (2*P) non-overlapping vertical detection zones in the area, a second column comprising at least one pair of vertical detection electrodes and a third column comprising at least one pair of vertical detection electrodes; a controller configured to measure a first mutual capacitance between the horizontal detection electrode and a vertical detection electrode in the pair of vertical detection electrodes in the second column, and configured to measure a second mutual capacitance between the horizontal detection electrode and another vertical detection electrode in the pair of vertical detection electrodes in the second column; and processing logic configured to; determine horizontal detection electrode and vertical detection electrode combinations based on a change in the first mutual capacitance and the second mutual capacitance; determine a digitized capacitance value based on the change in the first mutual capacitance and the second mutual capacitance; and determine a touch location based on a location of the horizontal detection electrode and vertical electrode combinations and the digitized capacitance. - View Dependent Claims (27, 28, 29)
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Specification