Time multiplexed touch detection and power charging
First Claim
1. A method of scanning a touch sensor panel, comprising:
- acquiring touch data from a plurality of touch sensors during at least one of charge and charge-free periods, the charge and charge-free periods occurring while the touch sensor panel is coupled to a charger;
determining whether the touch data was acquired during at least one of the charge periods, wherein the at least one of the charge periods includes noise received from the charger;
discarding the touch data when the touch data was acquired during the at least one of the charge periods;
in accordance with the touch data including an indication of a touch on the touch sensor panel;
generating and transmitting a first notification to the charger to operate with charge periods having a first duty cycle; and
in accordance with the touch data including an indication of an absence of a touch on the touch sensor panel;
generating and transmitting a second notification to the charger to operate with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle.
1 Assignment
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Accused Products
Abstract
A method of scanning a touch sensor panel while the touch sensor panel is coupled to a power adapter is disclosed. The power adapter can charge a battery of a device, but can also introduce or add noise during the process of charging the battery. To prevent adverse effects to the touch sensor panel, while the device is charging, the touch controller can time multiplex touch scan periods and inductive charging periods and can discard touch scans or touch images affected by the noise. Determining whether a touch scan is a bad touch scan can include performing a touch scan across the array of touch pixels and making a determination based on the scan profile. In some examples, the profile can be quantified using different metrics such as the shape, instantaneous slope of tail ends, a full-width half-maximum, and a monotonicity of the curve of the scan profile.
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Citations
18 Claims
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1. A method of scanning a touch sensor panel, comprising:
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acquiring touch data from a plurality of touch sensors during at least one of charge and charge-free periods, the charge and charge-free periods occurring while the touch sensor panel is coupled to a charger; determining whether the touch data was acquired during at least one of the charge periods, wherein the at least one of the charge periods includes noise received from the charger; discarding the touch data when the touch data was acquired during the at least one of the charge periods; in accordance with the touch data including an indication of a touch on the touch sensor panel; generating and transmitting a first notification to the charger to operate with charge periods having a first duty cycle; and in accordance with the touch data including an indication of an absence of a touch on the touch sensor panel; generating and transmitting a second notification to the charger to operate with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch sensor panel comprising:
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sensing circuitry configured to acquire touch data from a plurality of touch sensors during at least one of the charge and charge-free periods, the charge and charge-free periods occurring while the touch sensor panel is coupled to a charger; and a processor configured to; determine whether the touch data was acquired during at least one of the charge periods, wherein the at least one of the charge periods includes noise generated by the charger; discard the touch data when the touch data was acquired during the at least one of the charge periods; in accordance with the touch data including an indication of a touch on the touch sensor panel; generate and transmit a first notification to the charger to operate with charge periods having a first duty cycle; and in accordance with the touch data including an indication of an absence of a touch on the touch sensor panel; generate and transmit a second notification to the charger to operate with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of charging a touch sensor panel with a charger, the method comprising:
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receiving a first notification from the touch sensor panel, wherein the first notification includes an indication of a touch on the touch sensor panel; in accordance with receiving the first notification, operating the charger with charge periods having a first duty cycle, the first duty cycle less than a duty cycle of a scan period of the touch sensor panel; receiving a second notification from the touch sensor panel, wherein the second notification includes an indication of an absence of a touch occurring on the touch sensor panel; and in accordance with receiving the second notification, operating the charger with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle.
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Specification