ACTIVE PEN FOR MATRIX SENSOR
First Claim
1. An input device comprising:
- a plurality of sensor electrodes organized into a plurality of sets; and
a processing system configured to drive the plurality of sensor electrodes with modulated signals having a first frequency, wherein the processing system comprises;
a first plurality of receivers coupled to the plurality of sensor electrodes, wherein the first plurality of receivers are configured to obtain first resulting signals comprising effects corresponding to the modulated signals; and
a second plurality of receivers, wherein each receiver of the second plurality of receivers is coupled to an associated set of the plurality of sensor electrodes and configured to obtain second resulting signals comprising effects corresponding to active signals having a second frequency;
wherein the processing system is configured to demodulate the first resulting signals based on the first frequency of the modulated signals and the second resulting signals based on the second frequency, wherein the second frequency is different than the first frequency.
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Abstract
A capacitive sensing device detects the presence of an actively modulated input object, such as an active pen, using a matrix of sensor electrodes. The capacitive sensing device include receiver channels configured to perform capacitive sensing of the active pen based on one frequency, and other receiver channels configured to perform capacitive sensing of other input objects based on another frequency. The receiver channels for sensing the active pen may be multiplexed across the matrix of sensor electrodes to track the location of the active pen in a tracking window manner. The receiver channels for sensing the active pen may also be multiplexed across the matrix of sensor electrodes to broadly search for the location of the active pen.
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Citations
20 Claims
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1. An input device comprising:
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a plurality of sensor electrodes organized into a plurality of sets; and a processing system configured to drive the plurality of sensor electrodes with modulated signals having a first frequency, wherein the processing system comprises; a first plurality of receivers coupled to the plurality of sensor electrodes, wherein the first plurality of receivers are configured to obtain first resulting signals comprising effects corresponding to the modulated signals; and a second plurality of receivers, wherein each receiver of the second plurality of receivers is coupled to an associated set of the plurality of sensor electrodes and configured to obtain second resulting signals comprising effects corresponding to active signals having a second frequency;
wherein the processing system is configured to demodulate the first resulting signals based on the first frequency of the modulated signals and the second resulting signals based on the second frequency, wherein the second frequency is different than the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A processing system configured to drive a capacitive sensing device, the capacitive sensing device having a plurality of sensor electrodes organized into a plurality of sets, the processing system comprising:
a sensor module configured to drive the plurality of sensor electrodes with modulated signals having a first frequency, the sensor module comprising; a first receiver coupled to at least one sensor electrode of the plurality of sensor electrodes, wherein the first receiver is configured to obtain first resulting signals comprising effects corresponding to the modulated signals, a second receiver coupled to an associated set of the plurality of sensor electrodes, wherein the second receiver is configured to obtain second resulting signals comprising effects corresponding to active signals having a second frequency; and wherein the sensor module is further configured to demodulate the first resulting signals based on the first frequency of the modulated signals and demodulate the second resulting signals based on the second frequency, wherein the second frequency is different than the first frequency. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for detecting presence of an input object using a capacitive sensing device, the capacitive sensing device having a plurality of sensor electrodes organized in a plurality of sets, the method comprising:
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driving the plurality of sensor electrodes with modulated signals having a first frequency; receiving first resulting signals at a first receiver comprising effects corresponding to the modulated signals; receiving second resulting signals at a second receiver comprising effects corresponding to active signals having a second frequency; and demodulating the first resulting signals based on the first frequency of the modulated signals and the second resulting signals based on the second frequency, wherein the second frequency is different than the first frequency. - View Dependent Claims (17, 18, 19, 20)
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Specification