Touch and hover signal drift compensation
First Claim
1. A touch and hover sensing device comprising:
- a sensing panel configured to sense an object touching or hovering over the panel;
a grounding device configured to periodically interact with the sensing panel; and
a touch and hover control system configured to measure capacitance of the panel when the grounding device interacts with the panel and to set the measurement as a baseline capacitance of the device.
1 Assignment
0 Petitions
Accused Products
Abstract
Compensation for signal drift in a touch and hover sensing device is disclosed. A touch and hover sensing device can include a sensing panel to sense an object touching or hovering over the panel, a grounding device to periodically interact with the panel, and a control system to measure capacitance of the panel when the grounding device interacts with the panel, where the measurement captures any signal drift in the panel, and to set the measurement as a new baseline capacitance of the panel. Alternatively, the touch and hover sensing device can forgo the grounding device and configure the control system to measure capacitance of the panel either when there has been no touching or hovering object or when there is a substantially stationary touching or hovering object at the panel for a determinative time period, where the measurement captures any signal drift in the panel, and to set the measurement from this time period as the new baseline capacitance. The control system can apply the new baseline capacitance to touch and hover measurements so as to compensate for the signal drift.
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Citations
25 Claims
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1. A touch and hover sensing device comprising:
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a sensing panel configured to sense an object touching or hovering over the panel; a grounding device configured to periodically interact with the sensing panel; and a touch and hover control system configured to measure capacitance of the panel when the grounding device interacts with the panel and to set the measurement as a baseline capacitance of the device. - View Dependent Claims (2, 3, 4, 5)
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6. A touch and hover sensing device comprising:
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a sensing panel configured to sense an object touching or hovering over the panel; and a touch and hover control system configured to determine that the device is idle for a specific period, and, according to the determination, to set at least one capacitance measurement from the specific period as a baseline capacitance of the device. - View Dependent Claims (7, 8)
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9. A method of compensating for signal drift in a sensing panel, the method comprising:
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measuring capacitance at the panel indicative of an object proximate to the panel; determining whether the object is substantially stationary at the panel for a predetermined time period; and based on the determination, setting at least one capacitance measurement from the predetermined time period as a baseline capacitance for the panel. - View Dependent Claims (10, 11, 12, 13)
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14. A method of compensating for signal drift in a sensing panel, the method comprising:
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measuring capacitance at the panel and determining that the measurement is indicative of lack of an object proximate to the panel for a determinative time period; and in response to the determination, setting the capacitance measurement from the determinative time period as a baseline capacitance of the panel. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A touch and hover sensing device comprising:
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a touch and hover sensing panel having multiple sensors configured to detect one or more objects proximate to the panel, wherein the objects touch the panel to cause a touch event, hover over the panel to cause a hover event, or touch and hover concurrently to cause touch and hover events; and a touch and hover control system configured to measure capacitance of the panel during predetermined compensation periods and to determine at least one of whether a grounding device is interacting with the panel during a first of the compensation periods, whether there are no touch or hover events at the panel during a second of the compensation periods, or whether an object touching or hovering over the panel is substantially stationary during a third of the compensation periods, and, in response to the determination, to set a baseline capacitance of the panel based on the capacitance measurement from the respective predetermined compensation periods so as to compensate for signal drift in the panel. - View Dependent Claims (21, 22)
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23. A touch and hover sensing device comprising:
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a sensing panel configured to sense an object touching or hovering over the panel; and a touch and hover control system configured to determine that the device is detecting a substantially stationary touching or hovering object at the panel for a specific period, and, according to the determination, to set at least one capacitance measurement from the specific period as a baseline capacitance of the device. - View Dependent Claims (24, 25)
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Specification