Capacitive touch sensor with polarity normalization
First Claim
1. A projected capacitive touch sensor, comprising:
- a sensor grid including one or more electrically conductive rows and one or more electrically conductive columns;
a first column multiplexer that is connected to a first portion of the one or more electrically conductive columns;
a second column multiplexer that is connected to a second portion of the one or more electrically conductive columns;
a polarity switching circuit that is configured to;
receive a first address signal provided to the first column multiplexer;
receive a second address signal provided to the second column multiplexer;
compare the first address signal to the second address signal;
based on comparing the first address signal to the second address signal, determine a polarity of a differential signal generated from an output of the first column multiplexer and an output of the second column multiplexer; and
based on determining the polarity of the differential signal, determining whether to switch the polarity of the differential signal.
1 Assignment
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Accused Products
Abstract
This application relates to a projected capacitive touch sensor with polarity normalization. The sensor includes a sensor grid including one or more electrically conductive rows and one or more electrically conductive columns. The sensor further includes a first column multiplexer that is connected to a first portion of the one or more electrically conductive columns. The sensor further includes a second column multiplexer that is connected to a second portion of the one or more electrically conductive columns. The sensor further includes a polarity switching circuit that is configured to determine a polarity of a differential signal generated from an output of the first column multiplexer and an output of the second column multiplexer, and based on determining the polarity of the differential signal, determining whether to switch the polarity of the differential signal.
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Citations
20 Claims
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1. A projected capacitive touch sensor, comprising:
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a sensor grid including one or more electrically conductive rows and one or more electrically conductive columns; a first column multiplexer that is connected to a first portion of the one or more electrically conductive columns; a second column multiplexer that is connected to a second portion of the one or more electrically conductive columns; a polarity switching circuit that is configured to; receive a first address signal provided to the first column multiplexer; receive a second address signal provided to the second column multiplexer; compare the first address signal to the second address signal; based on comparing the first address signal to the second address signal, determine a polarity of a differential signal generated from an output of the first column multiplexer and an output of the second column multiplexer; and based on determining the polarity of the differential signal, determining whether to switch the polarity of the differential signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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determining a differential signal that is based on an output of a first column multiplexer and an output of a second column multiplexer, wherein the first column multiplexer is connected to a first portion of one or more electrically conductive columns of a sensor grid and the second column multiplexer is connected to a second portion of the one or more electrically conductive columns of the sensor grid; receiving a first address signal provided to the first column multiplexer; receiving a second address signal provided to the second column multiplexer; comparing the first address signal to the second address signal; based on comparing the first address signal to the second address signal, determining a polarity of the differential signal; and based on determining the polarity of the differential signal, determining whether to switch the polarity of the differential signal. - View Dependent Claims (14, 15, 16, 17)
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18. A method comprising:
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receiving an output of a first column multiplexer and an output of a second column multiplexer, wherein the first column multiplexer is connected to a first portion of one or more electrically conductive columns of a sensor grid and the second column multiplexer is connected to a second portion of the one or more electrically conductive columns of the sensor grid; receiving a bit of a first address signal provided to the first column multiplexer; receiving a bit of a second address signal provided to the second column multiplexer; comparing the bit of the first address signal provided to the first column multiplexer with the bit of the second address signal provided to the second column multiplexer; and based on comparing the bit of the first address signal provided to the first column multiplexer with the bit of the second address signal provided to the second column multiplexer, determining whether to switch a polarity of a differential signal generated based on the output of the first column multiplexer and the output of the second column multiplexer. - View Dependent Claims (19, 20)
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Specification