Matrix sensor for image touch sensing
First Claim
1. A display device having an integrated capacitive sensing device, the display device comprising:
- a plurality of sensor electrodes;
a grid electrode comprising a plurality of grid segments coupled by routing traces and disposed in a common plane with the plurality of sensor electrodes, wherein a first grid segment of the plurality of grid segments is disposed between a first sensor electrode and a second sensor electrode of the plurality of sensor electrodes, and a second grid segment is disposed between the second sensor electrode and a third sensor electrode of the plurality of sensor electrodes, wherein each sensor electrode of the plurality of sensor electrodes and each grid segment of the plurality of grid segments comprises at least one common electrode configured to be driven for display updating and capacitive sensing; and
a processing system coupled by routing traces to the sensor electrodes and the grid electrode, the processing system is configured to;
modulate the first sensor electrode acquire first changes in absolute capacitance during a first time period, the second sensor electrode to acquire second changes in absolute capacitance during a second time period, and the third sensor electrode to acquire third changes in absolute capacitance during a third time period, wherein the first time period at least partially overlaps with the second time period; and
drive the grid electrode with a shielding signal during the first, the second and the third time periods.
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Accused Products
Abstract
Embodiments described herein include an input device, 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, an input device includes a plurality of sensor electrodes arranged in a planar matrix array. Each sensor electrode is coupled to unique routing trace and has an identical geometric plan form that is symmetrical about a center of area of the sensor electrode. The geometric plan form of each sensor electrode includes core and a plurality of protrusions extending outward from the core. The protrusions are configured to overlap with protrusions extending outward from each adjacent sensor electrode of the matrix array.
325 Citations
18 Claims
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1. A display device having an integrated capacitive sensing device, the display device comprising:
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a plurality of sensor electrodes; a grid electrode comprising a plurality of grid segments coupled by routing traces and disposed in a common plane with the plurality of sensor electrodes, wherein a first grid segment of the plurality of grid segments is disposed between a first sensor electrode and a second sensor electrode of the plurality of sensor electrodes, and a second grid segment is disposed between the second sensor electrode and a third sensor electrode of the plurality of sensor electrodes, wherein each sensor electrode of the plurality of sensor electrodes and each grid segment of the plurality of grid segments comprises at least one common electrode configured to be driven for display updating and capacitive sensing; and a processing system coupled by routing traces to the sensor electrodes and the grid electrode, the processing system is configured to; modulate the first sensor electrode acquire first changes in absolute capacitance during a first time period, the second sensor electrode to acquire second changes in absolute capacitance during a second time period, and the third sensor electrode to acquire third changes in absolute capacitance during a third time period, wherein the first time period at least partially overlaps with the second time period; and drive the grid electrode with a shielding signal during the first, the second and the third time periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15)
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11. A processing system for an input device, the processing system comprising:
a sensor module, comprising sensor circuitry configured to be coupled to a grid electrode and a plurality of sensor electrodes, wherein the grid electrode comprises a plurality of grid segments disposed in a common plane with the plurality of sensor electrodes, wherein a first grid segment of the plurality of grid segments is disposed between a first sensor electrode and a second sensor electrode of the plurality of sensor electrodes, and a second grid segment is disposed between the second sensor electrode and a third sensor electrode of the plurality of sensor electrodes, wherein each sensor electrode of the plurality of sensor electrodes and each grid segment of the plurality of grid segments comprises at least one common electrode configured to be driven for display updating and capacitive sensing, the sensor module configured to; modulate the first sensor electrode acquire first changes in absolute capacitance during a first time period, the second sensor electrode to acquire second changes in absolute capacitance during a second time period, and the third sensor electrode to acquire third changes in absolute capacitance during a third time period, wherein the first time period at least partially overlaps with at least one of the second time period and the third time period; and drive the grid electrode with a shielding signal during the first, the second and the third time periods. - View Dependent Claims (12, 13, 14)
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16. A method for capacitive sensing, the method comprising:
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modulating a first sensor electrode of a plurality of sensor electrodes to acquire first changes in absolute capacitance during a first time period, a second sensor electrode of the plurality of sensor electrodes to acquire second changes in absolute capacitance during a second time period, and a third sensor electrode of the plurality of sensor electrodes to acquire third changes in absolute capacitance during a third time period, wherein the first time period at least partially overlaps with at least one of the second time period and the third time period; and driving a grid electrode with a shielding signal during the first, the second and the third time periods, wherein the grid electrode comprises a plurality of grid segments disposed in a common plane with the plurality of sensor electrodes, wherein a first grid segment of the plurality of grid segments is disposed between the first sensor electrode and the second sensor electrode, and a second grid segment is disposed between the second sensor electrode and the third sensor electrode, wherein each sensor electrode of the plurality of sensor electrodes and each grid segment of the plurality of grid segments comprises at least one common electrode configured to be driven for display updating and capacitive sensing. - View Dependent Claims (17, 18)
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Specification