Modulated power supply for reduced parasitic capacitance
First Claim
1. A processing system comprising:
- sensor circuitry configured to drive a first sensor electrode of a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on a modulated reference signal for capacitive sensing during a first time period;
wherein during the first time period a plurality of display electrodes of a display device is driven with modulated signals based on the modulated reference signal.
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Accused Products
Abstract
An input device comprising a display device having an integrated capacitive sensing device. The input device includes a plurality of sensor electrodes a plurality of display electrodes, a modulated power supply configured to provide a modulated reference signal, and a processing system. The processing system includes a sensor module configured to drive a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on the modulated reference signal for capacitive sensing during a first time period. The processing system also includes a display driver module configured to drive a plurality of display electrodes of a display device with modulated signals based on the modulated reference signal during the first time period. The modulated signals cause voltage between the plurality of display electrodes and the plurality of sensor electrodes to remain substantially constant.
40 Citations
21 Claims
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1. A processing system comprising:
sensor circuitry configured to drive a first sensor electrode of a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on a modulated reference signal for capacitive sensing during a first time period;
wherein during the first time period a plurality of display electrodes of a display device is driven with modulated signals based on the modulated reference signal.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An input device comprising:
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a plurality of sensor electrodes; a plurality of display electrodes; a modulated power supply configured to provide a modulated reference signal; and a processing system configured to; drive the plurality of sensor electrodes with modulated capacitive sensing signals that are based on the modulated reference signal for capacitive sensing during a first time period; and drive the plurality of display electrodes of a display device with modulated signals based on the modulated reference signal during the first time period. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for operating an input device, comprising:
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driving a first sensor electrode of a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on a modulated reference signal for capacitive sensing during a first time period, wherein during the first time period a plurality of display electrodes of a display device is driven with modulated signals based on the modulated reference signal, and wherein the plurality of display electrodes and the plurality of sensor electrodes have a substantially constant voltage differential during the first time period. - View Dependent Claims (20, 21)
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Specification