Touch and hover sensor compensation
First Claim
1. A method of compensating for sensors a sensing panel, the method comprising:
- measuring capacitance at the touch sensor panel in a self-capacitance mode,determining a location of an object based on the self-capacitance measurement in the self-capacitance mode;
adjusting the self-capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the self-capacitance mode;
measuring capacitance at the touch sensor panel in a mutual capacitance mode;
determining a location of the object based on the mutual capacitance measurement in the mutual capacitance mode; and
adjusting the self-capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the mutual capacitance mode, wherein adjusting the measurement comprises applying a first gain factor to the measurement in the self-capacitance mode, and applying a second gain factor to the measurement in the mutual capacitance mode, different from the first gain factor.
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Abstract
Compensation for sensors in a touch and hover sensing device is disclosed. Compensation can be for sensor resistance and/or sensor sensitivity variation that can adversely affect touch and hover measurements at the sensors. To compensate for sensor resistance, the device can gang adjacent sensors together so as to reduce the overall resistance of the sensors. In addition or alternatively, the device can drive the sensors with voltages from multiple directions so as to reduce the effects of the sensors'"'"' resistance. To compensate for sensor sensitivity variation (generally at issue for hover measurements), the device can apply a gain factor to the measurements, where the gain factor is a function of the sensor location, so as to reduce the sensitivity variation at different sensor locations on the device.
35 Citations
21 Claims
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1. A method of compensating for sensors a sensing panel, the method comprising:
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measuring capacitance at the touch sensor panel in a self-capacitance mode, determining a location of an object based on the self-capacitance measurement in the self-capacitance mode; adjusting the self-capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the self-capacitance mode; measuring capacitance at the touch sensor panel in a mutual capacitance mode; determining a location of the object based on the mutual capacitance measurement in the mutual capacitance mode; and adjusting the self-capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the mutual capacitance mode, wherein adjusting the measurement comprises applying a first gain factor to the measurement in the self-capacitance mode, and applying a second gain factor to the measurement in the mutual capacitance mode, different from the first gain factor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch and hover sensing device comprising:
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a sensing panel having multiple sensors at locations of the panel; and a touch and hover control system configured to compensate for a sensitivity variation of the touch and hover sensing device by; measuring a capacitance at the touch sensor panel in a self-capacitance mode, the capacitance being indicative of a proximate object, determining a location of the proximate object based on the measured self-capacitance at the sensors, adjusting the self capacitance measurements from the sensors according to a proximate object location in the self-capacitance mode; measuring capacitance at the touch sensor panel in a mutual capacitance mode; determining a location of the object based on the mutual capacitance measurement in the mutual capacitance mode; and adjusting the mutual capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the mutual capacitance mode, wherein adjusting the measurements comprises applying a first gain factor to the measurements in the self-capacitance mode, and applying a second gain factor to the measurement in the mutual capacitance mode, different from the first gain factor. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. 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 associated with the proximate objects in a self-capacitance mode, determine a location of the one or more proximate objects to the panel based on the self capacitance measurement in the self-capacitance mode, adjust the self-capacitance measurement based on the location of the one or more proximate objects so as to compensate for sensitivity variation in the self-capacitance mode; measure capacitance associated with the proximate objects in a mutual capacitance mode; determine a location of the one or more proximate objects based on the mutual capacitance measurement in the mutual capacitance mode; and adjust the mutual capacitance measurement based on the determined object location so as to compensate for location-based sensitivity variation in the sensing panel in the mutual capacitance mode, wherein adjusting the capacitance measurement comprises applying a first gain factor to the measurement in the self-capacitance mode, and applying a second gain factor to the measurement in the mutual capacitance mode, different from the first gain factor. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification