Mutual and self capacitance touch measurements in touch panel
First Claim
1. A method for measuring mutual and self capacitance at a touch panel comprising:
- measuring mutual and self capacitances at multiple touch node patterns in the touch panel;
determining one or more correction factors, the value of each correction factor being a function of both the measured mutual and self capacitances; and
calculating a touch signal based on applying the one or more correction factors to the measured mutual or self capacitances, the touch signal indicative of an object proximate to the touch panel.
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Accused Products
Abstract
A touch panel capable of measuring both mutual and self capacitance is disclosed. The touch panel can measure self capacitance and mutual capacitance at various electrode patterns and, based on the self capacitance measurements, the mutual capacitance measurements, or both, calculate a touch signal indicative of an object touching or hovering over the touch panel. In some examples, the measurements can also be used to determine a correction factor, indicative of an adverse condition at the touch panel, and the correction factor used to correct the touch signal for the adverse condition. The touch panel can have a row-column electrode pattern or a pixelated electrode pattern.
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Citations
23 Claims
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1. A method for measuring mutual and self capacitance at a touch panel comprising:
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measuring mutual and self capacitances at multiple touch node patterns in the touch panel; determining one or more correction factors, the value of each correction factor being a function of both the measured mutual and self capacitances; and calculating a touch signal based on applying the one or more correction factors to the measured mutual or self capacitances, the touch signal indicative of an object proximate to the touch panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A touch device comprising:
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a touch panel having a set of touch nodes capable of measuring a mutual capacitance touch and a self capacitance touch; and a processor capable of receiving at least one set of mutual capacitance touch measurements and at least one set of self capacitance touch measurements taken from multiple patterns of the touch nodes, determining one or more correction factors, the value of each correction factor being a function of both the at least one set of mutual capacitance touch measurements and the at least one set of self capacitance touch measurements; and calculating a touch signal at the touch panel based on applying the one or more correction factors to at least one of the set of mutual capacitance touch measurements and the set of self capacitance touch measurements. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method for using mutual and self capacitance measurements at a touch panel, comprising:
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measuring a self capacitance and a mutual capacitance at touch nodes of the touch panel, the measurements indicative of an object proximate to the touch panel; determining one or more correction factors, the value of each correction factor being a function of both the self and mutual capacitance measurements; and calculating a touch signal based on applying the one or more correction factors to the self or mutual capacitance measurements, the touch signal corrected for at least one of a grounding condition of the object, water disposed on the touch panel, or noise introduced into the touch panel.
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Specification