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US 9,870,103 B2Granted
Controller and method for controlling a capacitive touch screen or the like
AssigneeSilicon Laboratories Inc.
InventorsVadim Konradi, Parker Dorris, Michael Franklin, David R. Welland
Life of this patent
Estimating the term…
Abstract
A controller for a capacitive touch screen or the like includes a touch resolve subsystem and a processor. The touch resolve subsystem, when activated, measures a plurality of capacitance values using a plurality of input pins. The processor uses the plurality of capacitance values at each of a plurality of values of a parameter to create an interference map.
Claims4
A controller for a capacitive touch screen, comprising:
- a touch resolve subsystem that, when activated, measures a plurality of capacitance values using a plurality of input pins;
- and
- a processor that uses said plurality of capacitance values at each of a plurality of values of a parameter to create an interference map, said interference map identifying a level of interference at each of said plurality of values of said parameter, and said values vary over an allowed range, and to select a desired value of said parameter based on said interference map over said allowed range, wherein said parameter comprises a desired scan frequency,
- wherein said processor uses said interference map to select said desired scan frequency based on both said level of interference and scan frequency for each of a plurality of scan frequencies.
1 more element
A controller for a capacitive touch screen, comprising:
- a touch resolve subsystem that, when activated, measures a plurality of capacitance values using a plurality of input pins;
- and
- a processor that uses said plurality of capacitance values at each of a plurality of values of a parameter to create an interference map, said interference map identifying a level of interference at each of said plurality of values of said parameter, and said values vary over an allowed range, and to select a desired value of said parameter based on said interference map over said allowed range,
- wherein said parameter comprises a number of scan pulses per scan line.
1 more element
A controller for a capacitive touch screen, comprising:
- a touch resolve subsystem that, when activated, measures a plurality of capacitance values using a plurality of input pins;
- and
- a processor that uses said plurality of capacitance values at each of a plurality of values of a parameter to create an interference map, said interference map identifying a level of interference at each of said plurality of values of said parameter, and said values vary over an allowed range, and to select a desired value of said parameter based on said interference map over said allowed range,
- wherein said parameter indicates whether to implement a highpass filter in said touch resolve subsystem.
1 more element
Dependencies are inferred from the claim text.