Touch panel scan control

A method for detecting touch events on a touch panel, the method comprising:

• selecting a passive scan mode for a first scan of at least a portion of the touch panel;
• based on the selection of the passive scan mode, measuring absolute capacitance of at least one of a plurality of sensors of the touch panel to determine a measured absolute capacitance value;
• comparing the measured absolute capacitance to a baseline absolute capacitance value to generate a difference value;
• comparing the difference value to a threshold, wherein the difference value exceeding the threshold indicates a possibility of a touch event on the touch panel;
• in response to the difference value exceeding the threshold;
• selecting a focused active scan mode to perform a second scan of at least a portion of the touch panel;
• and
• in response to the difference value not exceeding the threshold;
• selecting the passive scan mode to perform a second scan.

Non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more physical computing devices, cause operations comprising:

• measuring absolute capacitance of at least one of a plurality of sensors of the touch panel to determine a measured absolute capacitance value;
• comparing the measured absolute capacitance to a baseline absolute capacitance value to generate a difference value;
• comparing the difference value to a threshold, wherein the difference value exceeding the threshold indicates a possibility of a touch event on the touch panel;
• in response to the difference value exceeding the threshold;
• selecting a focused active scan mode to perform a scan of at least a portion of the touch panel;
• and
• in response to the difference value not exceeding the threshold;
• selecting a passive scan mode to perform the scan.

A touch panel display apparatus comprising:

• means for measuring absolute capacitance of at least one of a plurality of sensors of a touch panel to determine a measured absolute capacitance value;
• means for comparing the measured absolute capacitance to a baseline absolute capacitance value to generate a difference value;
• means for comparing the difference value to a threshold, wherein the difference value exceeding the threshold indicates a possibility of a touch event on the touch panel;
• and
• means for selecting, based at least partly on a result of comparing the difference value to the threshold, one of a focused active scan mode and a passive scan mode to perform a scan of at least a portion of the touch panel.