Dual measurement for capacitive touch sensing and related systems, methods and devices

An apparatus, comprising:

• a touch sensor;
• an electrode of the touch sensor;
• a shielding of the electrode;
• a first circuit to:
• provide a driven-shield signal to at least a portion of the shielding;
• and
• perform a self-capacitance sensing measurement of the electrode;
• a second circuit to:
• provide a ground signal to at least the portion of the shielding, and
• perform a self-capacitance sensing measurement of the electrode;
• and
• a logic circuit to:
• determine that a self-capacitance sensing measurement by the first circuit exceeds a first threshold value;
• and
• determine that a self-capacitance sensing measurement by the second circuit exceeds a second threshold value, the second threshold value different from the first threshold value,
• wherein the at least the portion of shielding arranged relative to the electrode to facilitate directionality of electric fields projecting from the electrode, and
• wherein the at least the portion of shielding arranged relative to the electrode for projection of an electric field that extends farther from the electrode in a first direction than in a second direction, the second direction substantially opposite the first direction.

An apparatus, comprising:

• a computer-readable media having computer-readable instructions stored thereon;
• and
• a processing core configured to execute the computer-readable instructions, the computer-readable instructions including modules of executable code, the modules of executable code including:
• a first measurement module to perform a self-capacitance sensing measurement of an electrode of a touch sensor while a ground signal is provided to at least a portion of shielding of the electrode to enable the portion of the shielding as a grounded-shield;
• and
• a second measurement module to perform a self-capacitance sensing measurement of the electrode of the touch sensor while a driven shield signal is provided to at least the portion of shielding of the electrode to enable the portion of the shielding as a driven-shield;
• wherein the processing core is to report a touch responsive to both:
• a determination, by the first measurement module, that a value representative of self-capacitance measurement of the electrode performed while the ground signal provided to at least the portion of shielding of the electrode exceeds a first threshold value;
• and
• a determination, by the second measurement module, that a value representative of self-capacitance measurement of the electrode performed while the driven shield signal provided to at least the portion of shielding of the electrode exceeds a second threshold value,
• wherein the second threshold value is different from the first threshold value.

A method, comprising:

• performing first self-capacitance measurement of an electrode of a touch sensor while a driven shield-signal is provided to at least a portion of shielding of the electrode to enable the portion of the shielding as a driven-shield and a measurement signal is provided to the electrode;
• determining a first touch sensing result at least partially responsive to determining that a value representing performing first self-capacitance measurement exceeds a first threshold value;
• performing second self-capacitance measurement of the electrode of the touch sensor while a ground signal is provided to at least the portion of shielding of the electrode to enable the portion of the shielding as a grounded-shield and a further measurement signal is provided to the electrode;
• determining a second touch sensing result at least partially responsive to determining that a value representing performing second self-capacitance measurement exceeds a second threshold value, the second threshold value different from the first threshold value;
• and
• determining a touch result responsive to both the first touch sensing result and the second touch sensing result being indicative of a touch.

A system, comprising:

• a touch sensor;
• acquisition circuitry;
• and
• a processor to:
• perform, via the acquisition circuitry, first self-capacitance measurement of an electrode of the touch sensor while a driven shield-signal is provided to at least a portion of shielding of the electrode to enable the portion of the shielding as a driven-shield;
• determine a first touch sensing result at least partially responsive to determining that a value representing a performed first self-capacitance measurement exceeds a first threshold value;
• perform, via the acquisition circuitry, second self-capacitance measurement of the electrode of the touch sensor while a ground signal is provided to at least the portion of shielding of the electrode to enable the portion of the shielding as a grounded-shield;
• determine a second touch sensing result at least partially responsive to determining that a value representing a performed second self-capacitance measurement exceeds a second threshold value, the second threshold value different from the first threshold value;
• and
• determine a touch result responsive to both the first touch sensing result and the second touch sensing result being indicative of a touch.

A system, comprising:

• a touch sensor;
• acquisition circuitry;
• and
• a processor to:
• perform, via the acquisition circuitry, first self-capacitance measurement of an electrode of the touch sensor while a driven shield-signal is provided to at least a portion of shielding of the electrode;
• determine a first touch sensing result at least partially responsive to determining that a value representing a performed first self-capacitance measurement exceeds a first threshold value;
• perform, via the acquisition circuitry, second self-capacitance measurement of the electrode of the touch sensor while a ground signal is provided to at least the portion of shielding of the electrode;
• determine a second touch sensing result at least partially responsive to determining that a value representing a performed second self-capacitance measurement exceeds a second threshold value, the second threshold value different from the first threshold value;
• and
• determine a touch result responsive to both the first touch sensing result and the second touch sensing result being indicative of a touch,
• wherein the portion of shielding arranged relative to the electrode to facilitate directionality of electric fields projecting from the electrode,
• wherein the portion of shielding arranged relative to the electrode for projection of an electric field that extends farther from the electrode in a first direction than in a second direction, the second direction substantially opposite the first direction.