Multi-phase scanning
First Claim
1. A method of detecting objects proximate to a touch panel having a plurality of TX electrodes and a plurality of RX electrodes, comprising:
- receiving two distinct drive signals;
for each of a plurality of scanning stages;
selecting a TX pattern for a first scanning stage of the plurality of scanning stages;
selecting a respective one of the two distinct drive signals to drive each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern, wherein the respective TX pattern for each scanning stage, after the first scanning stage, is generated by a cyclic rotation of the TX pattern for the first scanning stage, and each pair of the plurality of TX electrodes has at least one stage in which the selected drive signals are distinct from each other; and
receiving sense signals from the plurality of RX electrodes, wherein each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode; and
correlating the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel.
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Accused Products
Abstract
A touch sensing apparatus includes a touch sensing surface having a plurality of TX electrodes and a plurality of RX electrodes. The touch sensing apparatus also includes capacitance sensing circuitry. The circuitry receives a plurality of drive signals. For each of a plurality of scanning stages, the circuitry applies a respective one of the plurality of drive signals to each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern. The respective TX pattern for each scanning stage is distinct. The circuitry receives sense signals from the plurality of RX electrodes. Each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode. The circuitry then correlates the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel.
28 Citations
20 Claims
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1. A method of detecting objects proximate to a touch panel having a plurality of TX electrodes and a plurality of RX electrodes, comprising:
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receiving two distinct drive signals; for each of a plurality of scanning stages; selecting a TX pattern for a first scanning stage of the plurality of scanning stages; selecting a respective one of the two distinct drive signals to drive each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern, wherein the respective TX pattern for each scanning stage, after the first scanning stage, is generated by a cyclic rotation of the TX pattern for the first scanning stage, and each pair of the plurality of TX electrodes has at least one stage in which the selected drive signals are distinct from each other; and receiving sense signals from the plurality of RX electrodes, wherein each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode; and correlating the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20)
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8. A touch sensing apparatus, comprising:
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a touch sensing surface having a plurality of TX electrodes and a plurality of RX electrodes; and capacitance sensing circuitry configured for; receiving two distinct drive signals; for each of a plurality of scanning stages; selecting a TX pattern for a first scanning stage of the plurality of scanning stages; selecting a respective one of the two distinct drive signals to drive each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern, wherein the respective TX pattern for each scanning stage, after the first scanning stage, is generated by a cyclic rotation of the TX pattern for the first scanning stage, and each pair of the plurality of TX electrodes has at least one stage in which the selected drive signals are distinct from each other; and receiving sense signals from the plurality of RX electrodes, wherein each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode; and correlating the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A host device, comprising:
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a display; a capacitance sensing array having a plurality of TX electrodes and a plurality of RX electrodes; and a touchscreen controller coupled to the capacitance sensing array, wherein the touch screen controller is configured for; receiving two distinct drive signals; for each of a plurality of scanning stages; selecting a TX pattern for a first scanning stage of the plurality of scanning stages; selecting a respective one of the two distinct drive signals to drive each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern, wherein the respective TX pattern for each scanning stage, after the first scanning stage, is generated by a cyclic rotation of the TX pattern for the first scanning stage, and each pair of the plurality of TX electrodes has at least one stage in which the selected drive signals are distinct from each other; and receiving sense signals from the plurality of RX electrodes, wherein each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode; and correlating the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel. - View Dependent Claims (16, 17, 18, 19)
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Specification