Finger touch sensing with a digitizer system
AssigneeN-trig Ltd.
InventorsTiberiu Carol GALAMBOS, Amir ZYSKIND
Life of this patent
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Abstract
A method for multi-touch detection on a grid based capacitive sensor includes transmitting consecutively a first and then a second sequence of a Golay pair of sequences on a first driver line of a grid based capacitive sensor and transmitting the first and then the second sequence of a Golay pair of sequences on a second driver line, at a predefined delay with respect to transmission on the first driver line. Output on a receiver line of the grid based capacitive sensor is sampled and output originating from the first driver line is separated from output originating from the second driver line. The presence of an input object is detected responsive to the output as separated.
Claims13
A method for multi-touch detection on a grid based capacitive sensor, the method comprising:
- transmitting consecutively a first and then a second sequence of a Golay pair of sequences on a first driver line of a grid based capacitive sensor;
- transmitting the first and then the second sequence of a Golay pair of sequences on a second driver line, at a predefined delay with respect to transmission on the first driver line;
- sampling output on a receiver line of the grid based capacitive sensor;
- separating output originating from the first driver line with output originating from the second driver line;
- and
- detecting presence of an input object responsive to the output as separated.
Circuitry for performing multi-touch detection on a grid based capacitive sensor comprising:
- drive circuitry configured to transmit a Golay pair of sequences on a first and second driver lines of a grid based capacitive sensor, wherein the Golay pair of sequences transmitted on the second driver line is transmitted with a predefined delay with respect to transmission on the first driver line;
- and
- receiver circuitry configured to sample output on a receiver line of the grid based capacitive sensor, separate output originating from the first driver line from output originating from the second driver line and detect presence of an input object responsive to the output as separated.
Dependencies are inferred from the claim text.