Techniques for reducing cross talk for simultaneous touch sensing and display updating
First Claim
1. A processing system for capacitive sensing, the processing system comprising:
- a sensor module configured to;
drive a first sensor electrode of each of a plurality of columns of sensor electrodes with a first sensing signal during a first blanking period before a display frame, wherein the first sensor electrode comprises a first display electrode at a first edge of a display, the first display electrode configured for updating display pixels of the display and for capacitive sensing,starting at a first time period after the first blanking period, drive the other sensor electrodes of the plurality of columns of sensor electrodes with sensing signals from the first edge of the display to a second edge of the display, wherein;
the sensor electrodes are driven by capacitive routing traces, andthe capacitive routing trace for driving a sensor electrode does not overlap any display line of a row of display elements nearer to the first edge of the display than the sensor electrode; and
a display driver configured to;
during a second time period that at least partially overlaps the first time period, drive a first display line of rows of display elements at the first edge of the display with a display update signal during the display frame, andafter the second time period, drive remaining display lines of rows of display elements with display update signals from the first edge of the display to the second edge of the display during the display frame,wherein, during the display frame, while driving the plurality of columns of sensor electrodes from the first edge to the second edge of the display, the capacitive routing trace for each sensor electrode, of the plurality of columns of sensor electrodes, while being driven with one of the sensing signals does not overlap the display line of the row of display elements being driven concurrently with one of the display update signals.
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Abstract
A processing system, input device, and method are provided for reducing interference in a capacitive sensing system. The processing system generally includes a sensor module configured to drive a first sensor electrode of a plurality of sensor electrodes with a first sensing signal during a first time period, wherein the first sensor electrode comprises a first display electrode of a display, the first display electrode configured for updating display pixels of the display and for capacitive sensing. The input device also includes a display driver configured to drive a first display line of display elements within the display with a display update signal during a second time period. The first time period at least partially overlaps with the second time period. Further, the first display line of display elements does not overlap the first sensor electrode.
13 Citations
19 Claims
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1. A processing system for capacitive sensing, the processing system comprising:
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a sensor module configured to; drive a first sensor electrode of each of a plurality of columns of sensor electrodes with a first sensing signal during a first blanking period before a display frame, wherein the first sensor electrode comprises a first display electrode at a first edge of a display, the first display electrode configured for updating display pixels of the display and for capacitive sensing, starting at a first time period after the first blanking period, drive the other sensor electrodes of the plurality of columns of sensor electrodes with sensing signals from the first edge of the display to a second edge of the display, wherein; the sensor electrodes are driven by capacitive routing traces, and the capacitive routing trace for driving a sensor electrode does not overlap any display line of a row of display elements nearer to the first edge of the display than the sensor electrode; and a display driver configured to; during a second time period that at least partially overlaps the first time period, drive a first display line of rows of display elements at the first edge of the display with a display update signal during the display frame, and after the second time period, drive remaining display lines of rows of display elements with display update signals from the first edge of the display to the second edge of the display during the display frame, wherein, during the display frame, while driving the plurality of columns of sensor electrodes from the first edge to the second edge of the display, the capacitive routing trace for each sensor electrode, of the plurality of columns of sensor electrodes, while being driven with one of the sensing signals does not overlap the display line of the row of display elements being driven concurrently with one of the display update signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An input device for capacitive sensing, the input device comprising:
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a plurality of columns of sensor electrodes; a display including a plurality of display lines of rows of display elements, wherein the sensor electrodes comprise display electrodes of the display configured for updating display pixels of the display and for capacitive sensing; and a processing system, comprising; a sensor module configured to; drive a first sensor electrode of each of the plurality of columns of sensor electrodes at a first edge of the display with a first sensing signal during a first blanking period before a display frame, and starting at a first time period after the first blanking period, drive the other sensor electrodes of the plurality of columns of sensor electrodes with sensing signals from the first edge of the display to a second edge of the display, wherein the sensor electrodes are driven by capacitive routing traces, and wherein the capacitive routing trace for driving a sensor electrode does not overlap any display line of a row of display elements nearer to the first edge of the display than the sensor electrode; and a display driver configured to; during a second time period that at least partially overlaps the first time period, drive a first display line at the first edge of the display with a display update signal during the display frame, and after the second time period, drive remaining display lines of rows of display elements with display update signals from the first edge of the display to the second edge of the display during the display frame, wherein, during the display frame, while driving the plurality of columns of sensor electrodes from the first edge to the second edge of the display, the capacitive routing trace for each sensor electrode, of the plurality of columns of sensor electrodes, while being driven with one of the sensing signals does not overlap the display line of the row of display elements being driven concurrently with one of the display update signals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for capacitive sensing, the method comprising:
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driving a first sensor electrode of each of a plurality of columns of sensor electrodes with a first sensing signal during a first blanking period before a display frame, wherein the first sensor electrode comprises a first display electrode at of a first edge of a display, the first display electrode configured for updating display pixels of the display and for capacitive sensing; starting at a first time period after the first blanking period, driving the other sensor electrodes of the plurality of columns of sensor electrodes with sensing signals from the first edge of the display to a second edge of the display, wherein; the sensor electrodes are driven by capacitive routing traces, and the capacitive routing trace for driving a sensor electrode does not overlap any display line of a row of display elements nearer to the first edge of the display than the sensor electrode; during a second time period that at least partially overlaps the first time period, driving a first display line of a row of display elements at the first edge of the display with a display update signal during a display frame, after the second time period, driving remaining display lines of rows of display elements with display update signals from the first edge of the display to the second edge of the display during the display frame, wherein, during the display frame, while driving the plurality of columns of sensor electrodes from the first edge to the second edge of the display, the capacitive routing trace for each sensor electrode, of the plurality of columns of sensor electrodes, while being driven with one of the sensing signals does not overlap the display line of the row of display elements being driven concurrently with one of the display update signals. - View Dependent Claims (17, 18, 19)
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Specification