Multi-touch ghost discrimination
First Claim
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1. An apparatus comprising:
- a touch screen panel including a sensing matrix arranged in a row-column format; and
a control device configured to;
scan the sensing matrix including a plurality of rows and a plurality of columns to detect presence of multiple objects at least proximate to the touch screen panel, including measuring a respective self-capacitance of each of the plurality of rows and each of the plurality of columns;
in accordance with the measured self-capacitances of the plurality of rows and the plurality of columns, identify a subset of rows and a subset of columns of the sensing matrix that correspond to the presence of the multiple objects;
identify a plurality of sensor pairs, wherein each sensor pair includes two sensors, each selected from either the subset of identified rows or the subset of identified columns; and
scan the plurality of sensor pairs to determine a plurality of combined self-capacitance values that are used to detect locations of the multiple objects relative to the touch screen panel, including;
for each of the plurality of sensor pairs, electrically coupling, by the control device, the two sensors of the respective sensor pair in parallel and measuring a respective magnitude of combined self-capacitance for the two sensors of the respective sensor pair.
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Abstract
An apparatus includes a touch screen panel including a sensing matrix arranged in a row-column format. The apparatus also includes a control device to scan the sensing matrix to detect a presence of multiple objects at least proximate to the touch screen panel. The control device can identify rows and columns of the sensing matrix that correspond to the presence of the multiple objects. The control device can orthogonally multiplex the identified rows and columns into one or more row-column pairs. The control device can scan at least one of the row-column pairs to detect locations of the multiple objects relative to the touch screen panel.
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Citations
16 Claims
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1. An apparatus comprising:
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a touch screen panel including a sensing matrix arranged in a row-column format; and a control device configured to; scan the sensing matrix including a plurality of rows and a plurality of columns to detect presence of multiple objects at least proximate to the touch screen panel, including measuring a respective self-capacitance of each of the plurality of rows and each of the plurality of columns; in accordance with the measured self-capacitances of the plurality of rows and the plurality of columns, identify a subset of rows and a subset of columns of the sensing matrix that correspond to the presence of the multiple objects; identify a plurality of sensor pairs, wherein each sensor pair includes two sensors, each selected from either the subset of identified rows or the subset of identified columns; and scan the plurality of sensor pairs to determine a plurality of combined self-capacitance values that are used to detect locations of the multiple objects relative to the touch screen panel, including;
for each of the plurality of sensor pairs, electrically coupling, by the control device, the two sensors of the respective sensor pair in parallel and measuring a respective magnitude of combined self-capacitance for the two sensors of the respective sensor pair. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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sensing, by a control device, a sensing matrix of a touch screen panel that includes a plurality of rows and a plurality of columns to detect presence of multiple objects at least proximate to the touch screen panel, including measuring a respective self-capacitance of each of the plurality of rows and each of the plurality of columns; in accordance with the measured self-capacitances of the plurality of rows and the plurality of columns, identifying, by the control device, a subset of rows and a subset of columns of the touch screen panel that correspond to the presence of the multiple objects; identifying a plurality of sensor pairs, wherein each sensor pair includes two sensors, each selected from either the subset of identified rows or the subset of identified columns; and sensing, by the control device, the plurality of sensor pairs to determine a plurality of combined self-capacitance values that are used to detect locations of the multiple objects relative to the touch screen panel, including;
for each of the plurality of sensor pairs, electrically coupling, by the control device, the two sensors of the respective sensor pair in parallel and measuring a respective magnitude of combined self-capacitance for the two sensors of the respective sensor pair. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method comprising:
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detecting a presence of multiple objects proximate to a sensing matrix of a touch screen panel that includes a plurality of rows and a plurality of columns in response to a first sensing of a respective self-capacitance of each of the plurality of rows and each of the plurality of columns of the touch screen panel; electrically coupling, by a control device, a first row corresponding to one of the multiple objects in parallel with a first column corresponding to one of the multiple objects to generate a first row-column pair; performing a second sensing to compute a first magnitude of combined self-capacitance of the first row-column pair to determine whether one of the multiple objects corresponds to the intersection of the first row and the first column; electrically coupling, by the control device, a second row corresponding to one of the multiple objects in parallel with a second column corresponding to one of the multiple objects to generate a second row-column pair; and performing a third sensing to compute a second magnitude of combined self-capacitance of the second row-column pair to determine whether one of the multiple objects corresponds to the intersection of the second row and the second column. - View Dependent Claims (13, 14, 15, 16)
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Specification