Dynamic mode switching for fast touch response
First Claim
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1. A method comprising:
- performing a first scan of a first set of electrodes of a touch-sensing surface, wherein the first set of electrodes comprises only row electrodes or only column electrodes of the touch-sensing surface, wherein performing the first scan comprises measuring a self capacitance for each electrode in the first set of electrodes;
determining a presence of at least one conductive object proximate to the touch-sensing surface based on the first scan;
repeating the performing the first scan until the at least one conductive object is proximate to the touch-sensing surface;
when the at least one conductive object is proximate to the touch-sensing surface based on the first scan, performing a second scan of a second set of electrodes of the touch-sensing surface, wherein the second set of electrodes comprises the other one of only the column electrodes or only the row electrodes of the touch-sensing surface, wherein performing the second scan comprises measuring a self capacitance for each electrode in the second set of electrodes;
in response to determining the presence of the at least one conductive object, performing a third scan of a third set of electrodes of the touch-sensing surface, wherein performing the third scan comprises measuring a mutual capacitance between at least one pair of electrodes of the third set of electrodes; and
repeating the performing the third scan without repeating the performing the first scan and the second scan until the at least one conductive object is no longer proximate to the touch-sensing surface.
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Abstract
A method of operating a touch-sensing surface may include performing a first scan of a first set of electrodes of a touch-sensing surface, determining a presence of at least one conductive object proximate to the touch-sensing surface, in response to determining the presence of the at least one conductive object, performing a second scan of a second set of electrodes of the touch-sensing surface, and repeating the performing the second scan until the at least one conductive object is no longer proximate to the touch-sensing surface.
129 Citations
18 Claims
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1. A method comprising:
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performing a first scan of a first set of electrodes of a touch-sensing surface, wherein the first set of electrodes comprises only row electrodes or only column electrodes of the touch-sensing surface, wherein performing the first scan comprises measuring a self capacitance for each electrode in the first set of electrodes; determining a presence of at least one conductive object proximate to the touch-sensing surface based on the first scan; repeating the performing the first scan until the at least one conductive object is proximate to the touch-sensing surface; when the at least one conductive object is proximate to the touch-sensing surface based on the first scan, performing a second scan of a second set of electrodes of the touch-sensing surface, wherein the second set of electrodes comprises the other one of only the column electrodes or only the row electrodes of the touch-sensing surface, wherein performing the second scan comprises measuring a self capacitance for each electrode in the second set of electrodes; in response to determining the presence of the at least one conductive object, performing a third scan of a third set of electrodes of the touch-sensing surface, wherein performing the third scan comprises measuring a mutual capacitance between at least one pair of electrodes of the third set of electrodes; and repeating the performing the third scan without repeating the performing the first scan and the second scan until the at least one conductive object is no longer proximate to the touch-sensing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A touch sensor controller comprising:
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processing logic circuitry; a plurality of inputs configured to couple the processing logic circuitry with each of a plurality of electrodes of a touch-sensing surface; and a capacitance sensor coupled with the plurality of inputs, wherein the capacitance sensor is configured to; perform a first scan of a first set of the plurality electrodes of the touch-sensing surface to determine a presence of at least one conductive object proximate to the touch-sensing surface, the first set comprising only row electrodes or only column electrodes of the touch-sensing surface, the first scan being a self-capacitance scan, repeat the first scan until the at least one conductive object is proximate to the touch-sensing surface, when the at least one when the at least one conductive object is proximate to the touch-sensing surface based on the first scan, perform a second scan of a second set of the plurality of electrodes, the second set of electrodes comprising the other one of only the column electrodes or only the row electrodes of the touch-sensing surface, and the second scan being a self-capacitance scan, in response to determining the presence of the at least one conductive object, perform a third scan of a third set of the plurality of electrodes of the touch-sensing surface, and repeat the third scan without repeating the first scan and the second scan until the at least one conductive object is no longer proximate to the touch-sensing surface. - View Dependent Claims (13, 14)
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15. A touch-sensor controller comprising:
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a plurality of inputs configured to couple with each of a plurality of electrodes of a touch-sensing surface; and a capacitance sensor coupled with the plurality of inputs, wherein the capacitance sensor is configured to perform a first self-capacitance scan of a first set of the plurality of electrodes to detect a presence of a conductive object proximate to the touch-sensing surface, wherein the first set comprises only row electrodes or only column electrodes of the plurality of electrodes, wherein the capacitance sensor is further configured to repeat the first self-capacitance scan until the presence of the conductive object is proximate to the touch-sensing surface, wherein the capacitance sensor is further configured to perform a second self-capacitance scan of a second set of the plurality of electrodes to determine a possible location of the conductive object when the presence of the conductive object is proximate to the touch-sensing surface based on the first scan, wherein the second set comprises the other one of only the column electrodes or only the row electrodes of the touch-sensing surface, wherein the capacitance sensor is further configured to perform a mutual capacitance scan between at least one pair of the plurality of electrodes to determine an actual position of the conductive object proximate to the touch-sensing surface, and wherein the capacitance sensor is further configured to repeat the mutual capacitance scan without repeating the first self-capacitance scan and the second self-capacitance scan until the conductive object is no longer proximate to the touch-sensing surface. - View Dependent Claims (16, 17, 18)
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Specification