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; and
calculating a touch signal, based on the measurements, 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
25 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; and calculating a touch signal, based on the measurements, 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 of a set of mutual capacitance touch measurements or a set of self capacitance touch measurements taken from multiple patterns of the touch nodes, and calculating a touch signal at the touch panel using the at least one set of 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 a correction factor based on the self and mutual capacitance measurements; and calculating a touch signal, based on the correction factor, 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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24. A touch panel comprising:
multiple touch nodes capable of detecting an object proximate to the panel, at least one of the touch nodes for detecting a touch of the object in a first operation and for measuring at least one of a self capacitance or a mutual capacitance of the node in a second operation. - View Dependent Claims (25)
Specification