Reconfigurable circuit topology for both self-capacitance and mutual capacitance sensing
First Claim
1. A method for switchably operating a touch sensor panel in a self-capacitance mode and a mutual capacitance mode, the method comprising:
- in the mutual capacitance mode;
configuring a first set of multiple lines as drive lines in a mutual capacitance configuration;
configuring a second set of multiple lines as sense lines in the mutual capacitance configuration; and
uncoupling the first set of multiple lines and the second set of multiple lines from a shield buffer and coupling an input of the shield buffer to a reference voltage; and
in the self-capacitance mode;
configuring the first set of multiple lines as sense electrodes in a self-capacitance configuration;
uncoupling the second set of multiple lines from a sense amplifier;
coupling the second set of multiple lines to a shield buffer and coupling the input of the shield buffer to a shield voltage, different from the reference voltage;
coupling the first set of multiple lines with the sense amplifier;
configuring the second set of multiple lines as sense electrodes in the self-capacitance configuration;
uncoupling the first set of multiple lines from the sense amplifier;
coupling the first set of multiple lines to a shield buffer and coupling the input of the shield buffer to the shield voltage; and
coupling the second set of multiple lines with the sense amplifier.
2 Assignments
0 Petitions
Accused Products
Abstract
A touch sensor panel configured to switch between a mutual capacitance touch sensing architecture and a self-capacitance touch sensing architecture is provided. The touch sensor panel includes circuitry that can switch the configuration of touch electrodes to act as either drive lines in a mutual capacitance configuration or as sense electrodes in a self-capacitance configuration. The touch sensor panel also includes circuitry that can switch the configuration of touch electrodes to act as either sense lines in a mutual capacitance configuration or as sense electrode in a self-capacitance configuration. By splitting a self-capacitance touch mode into a drive line self-capacitive mode and sense line self-capacitive mode, the touch sensor panel is able to reuse components thus requiring less space, weight and power.
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Citations
27 Claims
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1. A method for switchably operating a touch sensor panel in a self-capacitance mode and a mutual capacitance mode, the method comprising:
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in the mutual capacitance mode; configuring a first set of multiple lines as drive lines in a mutual capacitance configuration; configuring a second set of multiple lines as sense lines in the mutual capacitance configuration; and uncoupling the first set of multiple lines and the second set of multiple lines from a shield buffer and coupling an input of the shield buffer to a reference voltage; and in the self-capacitance mode; configuring the first set of multiple lines as sense electrodes in a self-capacitance configuration; uncoupling the second set of multiple lines from a sense amplifier; coupling the second set of multiple lines to a shield buffer and coupling the input of the shield buffer to a shield voltage, different from the reference voltage; coupling the first set of multiple lines with the sense amplifier; configuring the second set of multiple lines as sense electrodes in the self-capacitance configuration; uncoupling the first set of multiple lines from the sense amplifier; coupling the first set of multiple lines to a shield buffer and coupling the input of the shield buffer to the shield voltage; and coupling the second set of multiple lines with the sense amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch sensitive device capable of operating in both a self-capacitance and a mutual capacitance mode, the device comprising:
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a touch sensor panel, the touch sensor panel including both a first set of multiple lines and a second set of multiple lines; switching circuitry coupled to both the first set of multiple lines and the second set of multiple lines; a sense amplifier; and a processor capable of; in the mutual capacitance mode; configuring the first set of multiple lines as drive lines in a mutual capacitance configuration; and configuring the second set of multiple lines as sense lines in the mutual capacitance configuration; and uncoupling the first set of multiple lines and the second set of multiple lines from a shield buffer and coupling an input of the shield buffer to a reference voltage; and in the self-capacitance mode; configuring the first set of multiple lines as sense electrodes in a self-capacitance configuration; uncoupling the second set of multiple lines from the sense amplifier; coupling the second set of multiple lines to a shield buffer and coupling the input of the shield buffer to a shield voltage, different from the reference voltage; coupling the sense amplifier with the first set of multiple lines; configuring the second set of multiple lines as sense electrodes in the self-capacitance configuration; uncoupling the first set of multiple lines from the sense amplifier; coupling the first set of multiple lines to a shield buffer and coupling the input of the shield buffer to the shield voltage; and coupling the sense amplifier with the second set of multiple lines. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable storage medium having stored thereon a set of instructions for switching a touch sensor panel between a self-capacitance mode and a mutual capacitance mode, that when executed by a processor causes the processor to:
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in the mutual capacitance mode; configure a first set of multiple lines as drive lines in a mutual capacitance configuration; and uncoupling the first set of multiple lines and the second set of multiple lines from a shield buffer and coupling an input of the shield buffer to a reference voltage; and configure a second set of multiple lines as sense lines in the mutual capacitance configuration; and in the self-capacitance mode; configure the first set of multiple lines as sense electrodes in a self-capacitance configuration; uncouple the second set of multiple lines from a sense amplifier; coupling the second set of multiple lines to a shield buffer and coupling the input of the shield buffer to a shield voltage, different from the reference voltage; couple the first set of multiple lines with the sense amplifier; configure the second set of multiple lines as sense electrodes in the self-capacitance configuration; uncouple the first set of multiple lines from the sense amplifier; coupling the first set of multiple lines to a shield buffer and coupling the input of the shield buffer to the shield voltage; and couple the second set of multiple lines with the sense amplifier. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification