Systems and methods for detecting low ground mass conditions in sensor devices
First Claim
1. A processing system for an input device, the processing system comprising:
- a sensor module comprising sensor circuitry, the sensor module configured to;
acquire a first plurality of mutual capacitive measurements of change in capacitive coupling between a set of transmitter sensor electrodes and a set of receiver sensor electrodes, wherein acquiring the first plurality of mutual capacitive measurements comprises driving the set of transmitter sensor electrodes and receiving resulting signals using the set of receiver sensor electrodes;
acquire a second plurality of self-capacitive measurements by modulating a signal on the set of receiver sensor electrodes with respect to a first reference voltage and detecting a capacitive coupling between the set of receiver sensor electrodes and an input object; and
acquire a third plurality of self capacitance measurements by modulating a signal on the set of transmitter sensor electrodes with respect to a second reference voltage and detecting a capacitive coupling between the set of transmitter sensor electrodes and the input object; and
a determination module configured to;
determine a first combined measurement using the first plurality of mutual capacitance measurements;
determine a second combined measurement using the second plurality of self capacitance measurements;
determine a third combined measurement based on the third plurality of self capacitance measurements; and
determine positional information for the input object based on a low ground mass parameter, the low ground mass parameter identifying free-space capacitive coupling of the input device, wherein the low ground mass parameter is based on a comparison of the first combined measurement and the second combined measurement, and wherein the low ground mass parameter is further based on the third combined measurement.
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Abstract
A processing system for an input device includes a sensor module and a determination module. The sensor module includes sensor circuitry and is configured to acquire a first plurality of measurements of change in capacitive coupling between each sensor electrode of a first set of sensor electrodes and a second set of sensor electrodes. The sensor module is further configured to acquire a second plurality of measurements of change in capacitive coupling between each sensor electrode of the second set of sensor electrodes and an input object. The determination module is configured to determine a first combined measurement based on the first plurality of measurements, determine a second combined measurement based on the second plurality of measurements, and determine positional information for the input object based on a low ground mass parameter. The low ground mass parameter is based on the first combined measurement and the second combined measurement.
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Citations
19 Claims
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1. A processing system for an input device, the processing system comprising:
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a sensor module comprising sensor circuitry, the sensor module configured to; acquire a first plurality of mutual capacitive measurements of change in capacitive coupling between a set of transmitter sensor electrodes and a set of receiver sensor electrodes, wherein acquiring the first plurality of mutual capacitive measurements comprises driving the set of transmitter sensor electrodes and receiving resulting signals using the set of receiver sensor electrodes; acquire a second plurality of self-capacitive measurements by modulating a signal on the set of receiver sensor electrodes with respect to a first reference voltage and detecting a capacitive coupling between the set of receiver sensor electrodes and an input object; and acquire a third plurality of self capacitance measurements by modulating a signal on the set of transmitter sensor electrodes with respect to a second reference voltage and detecting a capacitive coupling between the set of transmitter sensor electrodes and the input object; and a determination module configured to; determine a first combined measurement using the first plurality of mutual capacitance measurements; determine a second combined measurement using the second plurality of self capacitance measurements; determine a third combined measurement based on the third plurality of self capacitance measurements; and determine positional information for the input object based on a low ground mass parameter, the low ground mass parameter identifying free-space capacitive coupling of the input device, wherein the low ground mass parameter is based on a comparison of the first combined measurement and the second combined measurement, and wherein the low ground mass parameter is further based on the third combined measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A capacitive sensor device comprising:
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a set of transmitter electrodes; a set of receiver electrodes; and a processing system communicatively coupled to the first set of electrodes and the second set of electrodes, the processing system configured to; acquire a first plurality of mutual capacitance measurements of change in capacitive coupling between the set of transmitter sensor electrodes and the set of receiver sensor electrodes, wherein acquiring the first plurality of mutual capacitive measurements comprises driving the set of transmitter sensor electrodes and receiving resulting signals using the set of receiver sensor electrodes; and acquire a second plurality of self capacitance measurements by modulating a signal on the set of receiver sensor electrodes with respect to a first reference voltage and detecting a capacitive coupling between the set of receiver sensor electrodes and an input object; acquire a third plurality of self capacitance measurements by modulating a signal on the set of transmitter sensor electrodes with respect to a second reference voltage and detecting a capacitive coupling between the set of transmitter sensor electrodes and the input object; determine a first combined measurement using the first plurality of mutual capacitance measurements; determine a second combined measurement using the second plurality of self capacitance measurements; determine a third combined measurement based on the third plurality of self capacitance measurements; and determine positional information for the input object based on a low ground mass parameter, the low ground mass parameter identifying a free-space capacitive coupling of the input device, wherein the low ground mass parameter is based on a comparison of the first combined measurement and the second combined measurement, and wherein the low ground mass parameter is further based on the third combined measurement. - View Dependent Claims (13, 14, 15)
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16. A method of capacitive sensing, the method comprising:
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acquiring a first plurality of mutual capacitance measurements of change in capacitive coupling between a set of transmitter sensor electrodes and a set of receiver sensor electrodes, wherein acquiring the first plurality of mutual capacitive measurements comprises driving the set of transmitter sensor electrodes and receiving resulting signals using the set of receiver sensor electrodes; acquiring a second plurality of self capacitance measurements by modulating a signal on the set of receiver sensor electrodes with respect to a first reference voltage and detecting a capacitive coupling between the set of receiver sensor electrodes and an input object; acquiring a third plurality of self capacitance measurements by modulating a signal on the set of transmitter sensor electrodes with respect to a second reference voltage and detecting a capacitive coupling between the set of transmitter sensor electrodes and the input object; determining a first combined measurement using the first plurality of mutual capacitance measurements; determining a second combined measurement using the second plurality of self capacitance measurements; determine a third combined measurement based on the third plurality of self capacitance measurements; and determining positional information for the input object based on a low ground mass parameter, the low ground mass parameter identifying a free-space capacitive coupling of the input device, wherein the low ground mass parameter is based on a comparison of the first combined measurement and the second combined measurement, and wherein the low ground mass parameter is further based on the third combined measurement. - View Dependent Claims (17, 18, 19)
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Specification