WATERPROOF BASELINE TRACKING IN CAPACITIVE TOUCH CONTROLLERS
First Claim
Patent Images
1. A method for a touch panel control circuit, the method comprising:
- stimulating a touch panel;
receiving signals from the touch panel responsive to the stimulating;
based on the received signals, determining a contaminant to be present on the touch panel; and
switching to a wet baseline mode of operation while the contaminant is present on the touch panel.
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Abstract
A method for a touch panel control circuit includes stimulating a touch panel and receiving signals responsive to the stimulating. Based on the received signals, water or another contaminant may be determined to be present on the touch panel. While the contaminant is present on the touch panel, a wet baseline mode of operation in which a different baseline value is used to detect a touch condition for the touch panel. When the contaminant is removed, operation returns to a dry baseline mode.
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Citations
20 Claims
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1. A method for a touch panel control circuit, the method comprising:
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stimulating a touch panel; receiving signals from the touch panel responsive to the stimulating; based on the received signals, determining a contaminant to be present on the touch panel; and switching to a wet baseline mode of operation while the contaminant is present on the touch panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A controller circuit for a touch panel, the controller circuit comprising:
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a baseline tracking filter having an input configured to receive raw signals from the touch panel upon electrical stimulation of the touch panel and a baseline output operative to provide baseline capacitance data for the touch panel; a combiner having a first input coupled to the input to receive the raw signals and having a second input to receive the baseline output, and an output operative to provide capacitance heatmap data for the touch panel; and a controller operatively coupled to the baseline filter to select one of a dry baseline mode and a wet baseline mode of operation based on the capacitance heat map data for the touch panel, the controller varying the bandwidth of the filter based on the mode of operation - View Dependent Claims (11, 12, 13)
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14. A method for a touch panel control circuit, the method comprising:
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stimulating the touch panel with electrical signals; detecting raw capacitance data for the touch panel in response to the stimulating; subtracting a baseline level from the raw capacitance level to produce touch heat map data for the touch panel, including; subtracting a dry baseline level to produce the touch heat map data, and subtracting a wet baseline level to produce the touch heat map data when the raw capacitance data indicates an abnormal condition exists on the touch panel. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification