System and method for detecting an active pen with a matrix sensor
First Claim
Patent Images
1. A processing system, comprising:
- display circuitry configured to drive display signals onto a plurality of display electrodes for updating a display; and
sensor circuitry configured to communicate with a plurality of sensor electrodes, the plurality of sensor electrodes comprising first and second sensor electrodes and a first grid electrode disposed between the first and second sensor electrodes, wherein the plurality of sensor electrodes includes at least one of the plurality of display electrodes, wherein the sensor circuitry is configured to;
in a first mode of operation, operate a first portion of the plurality of sensor electrodes to receive an active input signal from an active input device, the first portion comprising the first grid electrode, andin a second mode of operation, operate a second portion of the plurality of sensor electrodes to receive input from a passive input device, the first and second portions including at least the first grid electrode in common, wherein operating the second portion comprises;
receiving, using at least one of the first and second sensor electrodes and while driving the first grid electrode with a guarding signal, resulting signals corresponding to a driven capacitive sensing signal, wherein the guarding signal comprises a varying voltage signal having at least one of a similar phase, frequency, and amplitude as the driven capacitive sensing signal.
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Abstract
A processing system, input device, and method are disclosed to detect an active input device. The method includes operating a first portion of a plurality of sensor electrodes to receive an active input signal from an active input device, and operating a second portion of the plurality of sensor electrodes to receive capacitive sensing data corresponding to a passive input device. The first and second portions include at least one sensor electrode in common. The method also includes driving a plurality of display electrodes to update a display image, wherein the plurality of sensor electrodes includes at least one of the plurality of display electrodes.
262 Citations
20 Claims
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1. A processing system, comprising:
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display circuitry configured to drive display signals onto a plurality of display electrodes for updating a display; and sensor circuitry configured to communicate with a plurality of sensor electrodes, the plurality of sensor electrodes comprising first and second sensor electrodes and a first grid electrode disposed between the first and second sensor electrodes, wherein the plurality of sensor electrodes includes at least one of the plurality of display electrodes, wherein the sensor circuitry is configured to; in a first mode of operation, operate a first portion of the plurality of sensor electrodes to receive an active input signal from an active input device, the first portion comprising the first grid electrode, and in a second mode of operation, operate a second portion of the plurality of sensor electrodes to receive input from a passive input device, the first and second portions including at least the first grid electrode in common, wherein operating the second portion comprises; receiving, using at least one of the first and second sensor electrodes and while driving the first grid electrode with a guarding signal, resulting signals corresponding to a driven capacitive sensing signal, wherein the guarding signal comprises a varying voltage signal having at least one of a similar phase, frequency, and amplitude as the driven capacitive sensing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An input device, comprising:
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a plurality of sensor electrodes comprising first and second sensor electrodes and a first grid electrode disposed between the first and second sensor electrodes, wherein at least one of the plurality of sensor electrodes is operable to update a display image and to perform input sensing; and a processing system coupled with the plurality of sensor electrodes, wherein the processing system is configured to; in a first mode of operation, operate a first portion of the plurality of sensor electrodes to receive an active input signal from an active input device, the first portion comprising the first grid electrode, and in a second mode of operation, operate a second portion of the plurality of sensor electrodes to receive input from a passive input device, the first and second portions including at least the first grid electrode in common, wherein operating the second portion comprises; receiving, using at least one of the first and second sensor electrodes and while driving the first grid electrode with a guarding signal, resulting signals corresponding to a driven capacitive sensing signal, wherein the guarding signal comprises a varying voltage signal having at least one of a similar phase, frequency, and amplitude as the driven capacitive sensing signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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operating, in a first mode of operation, a first portion of a plurality of sensor electrodes to receive an active input signal from an active input device, the plurality of sensor electrodes comprising first and second sensor electrodes and a first grid electrode disposed between the first and second sensor electrodes, the first portion comprising the first grid electrode; operating, in a second mode of operation, operating a second portion of the plurality of sensor electrodes to receive input from a passive input device, the first and second portions including at least the first grid electrode in common, wherein operating the second portion comprises; receiving, using at least one of the first and second sensor electrodes and while driving the first grid electrode with a guarding signal, resulting signals corresponding to a driven capacitive sensing signal, wherein the guarding signal comprises a varying voltage signal having at least one of a similar phase, frequency, and amplitude as the driven capacitive sensing signal; and driving, in a third mode of operation, a plurality of display electrodes to update a display image, wherein the plurality of sensor electrodes includes at least one of the plurality of display electrodes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification