Sensor matrix pad for performing multiple capacitive sensing techniques
First Claim
1. An input device comprising:
- a display device;
a plurality of sensor electrodes that establish a sensing region of the input device, wherein the plurality of sensor electrodes are disposed on a same plane and form a grid, wherein the grid comprises multiple columns and rows, and wherein each column and row includes multiple capacitive sensing pixels that each includes a first sensor electrode encircled by a second sensor electrode; and
a processing system coupled to the plurality of sensor electrodes, the processing system is configured to;
perform absolute capacitive sensing during a first time period by driving, in each of the capacitive sensing pixels, a modulated signal on at least one of the first sensor electrode of the plurality of sensor electrodes and the second sensor electrode of the plurality of sensor electrodes,perform transcapacitance sensing during a second time period by driving a transmitter signal onto the first sensor electrode and measuring a resulting signal on the second sensor electrode in each of the capacitive sensing pixels; and
determine a change in capacitive coupling between at least one of the first and second sensor electrodes and the input object in a hover detection mode and in a touch detection mode, wherein, when operating in the hover detection mode, the modulated signal is driven on the first sensor electrode and, when operating in the touch detection mode, the modulated signal is driven on the second sensor electrode.
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Accused Products
Abstract
Embodiments in the present disclosure use various individual electrodes in a capacitive sensing pixel of an electrode matrix to perform two different techniques of capacitive sensing. For example, a capacitive sensing pixel may include at least two sensor electrodes that may be driven different by a processing system depending on the current capacitive technique being used to user interaction. When performing absolute capacitive sensing, a first one of the sensor electrodes may be driven with a modulated signal in order to measure a change in absolute capacitance between the driven sensor electrode and an input object. Alternatively, when performing transcapacitance sensing, the first sensor electrode is driven with a transmitter signal while a resulting signal is measured on a second sensor electrode in the capacitive pixel. In this manner, the individual electrodes in a capacitive sensing pixel may be driven differently depending on the current capacitive sensing technique.
253 Citations
18 Claims
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1. An input device comprising:
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a display device; a plurality of sensor electrodes that establish a sensing region of the input device, wherein the plurality of sensor electrodes are disposed on a same plane and form a grid, wherein the grid comprises multiple columns and rows, and wherein each column and row includes multiple capacitive sensing pixels that each includes a first sensor electrode encircled by a second sensor electrode; and a processing system coupled to the plurality of sensor electrodes, the processing system is configured to; perform absolute capacitive sensing during a first time period by driving, in each of the capacitive sensing pixels, a modulated signal on at least one of the first sensor electrode of the plurality of sensor electrodes and the second sensor electrode of the plurality of sensor electrodes, perform transcapacitance sensing during a second time period by driving a transmitter signal onto the first sensor electrode and measuring a resulting signal on the second sensor electrode in each of the capacitive sensing pixels; and determine a change in capacitive coupling between at least one of the first and second sensor electrodes and the input object in a hover detection mode and in a touch detection mode, wherein, when operating in the hover detection mode, the modulated signal is driven on the first sensor electrode and, when operating in the touch detection mode, the modulated signal is driven on the second sensor electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for performing capacitive sensing comprising a plurality of sensor electrodes that establish a sensing region of an input device, the method comprising:
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performing absolute capacitive sensing during a first time period by driving a modulated signal on at least one of a first sensor electrode of the plurality of sensor electrodes and a second sensor electrode of the plurality of sensor electrodes to determine a change in absolute capacitance between at least one of the first and second sensor electrodes and an input object, wherein the first and second sensor electrodes are disposed on a same plane in the display device, and performing transcapacitance sensing during a second time period by driving a transmitter signal onto the first sensor electrode and measuring a resulting signal on the second sensor electrode, wherein performing absolute capacitive sensing comprises operating in at least one of a hover detection mode and a touch detection mode, wherein, when operating in the hover detection mode, the modulated signal is driven on the first sensor electrode and, when operating in the touch detection mode, the modulated signal is driven on the second sensor electrode. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A processing system for a capacitive sensing device comprising a sensing region, the processing system comprising:
a sensor module coupled to a plurality of sensor electrodes, the sensor module configured to; perform a first mode of capacitive sensing during a first time period by driving a modulated signal on at least one of a first sensor electrode of the plurality of sensor electrodes and a second sensor electrode of the plurality of sensor electrodes, wherein the first mode comprises determining a change in capacitive coupling between at least one of the first and second sensor electrodes and an input object in a hover detection mode and in a touch detection mode, wherein, when operating in the hover detection mode, the modulated signal is driven on the first sensor electrode and, when operating in the touch detection mode, the modulated signal is driven on the second sensor electrode, and perform a second, different mode of capacitive sensing during a second time period using at least one of the first and second sensor, wherein the second sensor electrode at least partially encircles the first sensor electrode. - View Dependent Claims (17, 18)
Specification