Targeted transcapacitance sensing for a matrix sensor
First Claim
1. An input device comprising a display device having an integrated capacitive sensing device, the input device comprising:
- a plurality of sensor electrodes arranged in a matrix, each sensor electrode comprising one or more common electrodes that are configured for both touch sensing and display updating; and
a processing system configured to be coupled to the plurality of sensor electrodes, wherein the processing system is configured to;
modulate each of the plurality of sensor electrodes to determine changes in absolute capacitance;
select a subset of the plurality of sensor electrodes based on the determined changes in absolute capacitance, wherein the subset is less than the plurality of sensor electrodes and includes a first sensor electrode and a second sensor electrode;
drive the first sensor electrode and receive with the second sensor electrode to determine changes in transcapacitance between the first sensor electrode and the second sensor electrode; and
determine positional information for an input object in a sensing region of the capacitive sensing device based on the changes in transcapacitance.
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Accused Products
Abstract
Embodiments described herein include a display device having a capacitive sensing device, a processing system and a method for detecting presence of an input object using a capacitive sensing device. In one embodiment, the display device includes a plurality of sensor electrodes arranged in a matrix. The processing system performs absolute capacitive sensing with the matrix of sensor electrodes. When an area of interest is detected using the absolute capacitive sensing techniques, the processing system performs targeted transcapacitance sensing using a selected subset of the sensor electrodes in the area of interest.
104 Citations
20 Claims
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1. An input device comprising a display device having an integrated capacitive sensing device, the input device comprising:
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a plurality of sensor electrodes arranged in a matrix, each sensor electrode comprising one or more common electrodes that are configured for both touch sensing and display updating; and a processing system configured to be coupled to the plurality of sensor electrodes, wherein the processing system is configured to; modulate each of the plurality of sensor electrodes to determine changes in absolute capacitance; select a subset of the plurality of sensor electrodes based on the determined changes in absolute capacitance, wherein the subset is less than the plurality of sensor electrodes and includes a first sensor electrode and a second sensor electrode; drive the first sensor electrode and receive with the second sensor electrode to determine changes in transcapacitance between the first sensor electrode and the second sensor electrode; and determine positional information for an input object in a sensing region of the capacitive sensing device based on the changes in transcapacitance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing system configured to drive a capacitive sensing device, the capacitive sensing device having a plurality of sensor electrodes arranged in a matrix, each sensor electrode comprising one or more common electrodes that are configured for both capacitive sensing and display updating, the processing system comprising:
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a sensor module having sensor circuitry configured to modulate each of the plurality of sensor electrodes to determine changes in absolute capacitance, and configured to select a subset of the plurality of sensor electrodes based on determined changes in absolute capacitance, wherein the subset being less than the plurality of sensor electrodes and includes a first sensor electrode and a second sensor electrode; wherein the sensor module is further configured to drive onto the first sensor electrode and receive with the second sensor electrode to determine changes in transcapacitance between the first sensor electrode and the second sensor electrode; and a determination module configured to determine positional information for an input object in a sensing region of the capacitive sensing device based on the changes in transcapacitance. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for detecting an input object in a sensing region of a capacitive sensing device, the capacitive sensing device having a plurality of sensor electrodes arranged in a matrix, the method comprising:
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modulating each of the plurality of sensor electrodes with electrical signals to determine changes in absolute capacitance; selecting a subset of the plurality of sensor electrodes based on the determined changes in absolute capacitance, wherein the subset is less than the plurality of sensor electrodes and includes a first sensor electrode and a second sensor electrode; and driving the first sensor electrode and receiving with the second sensor electrode to determine changes in transcapacitance between the first sensor electrode and the second sensor electrode. - View Dependent Claims (19, 20)
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Specification