Frequency shifting for simultaneous active matrix display update and in-cell capacitive touch
First Claim
1. An input device comprising:
- a plurality of display electrodes;
a plurality of sensor electrodes; and
a processing system coupled with the plurality of display electrodes and with the plurality of sensor electrodes, wherein the processing system is configured to;
drive a display signal onto at least one of the plurality of display electrodes for updating pixels of a display,drive, during a first period that at least partially overlaps with driving the display signal for updating pixels of the display, a first capacitive sensing signal having a first frequency onto at least one sensor electrode of the plurality of sensor electrodes, wherein the first frequency is synchronized with the display signal, anddrive, during a second period that at least partially overlaps with driving the display signal for updating pixels of the display, a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ; and
adjusting a timing of the display signal to maintain synchronization of the display signal with the second frequency.
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Abstract
Embodiments generally provide a method, input device, and processing system for frequency shifting for synchronized display updating and capacitive sensing. The method includes driving a display signal onto at least one display electrode for updating a display. The method further includes driving a first capacitive sensing signal having a first frequency onto at least one sensor electrode, wherein the first frequency is synchronized to the display signal. The method further includes driving a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ and a timing of the display signal is adjusted to maintain synchronization with the second frequency, and wherein each capacitive sensing signal and the display signal are driven in parallel for at least some period of time.
86 Citations
22 Claims
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1. An input device comprising:
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a plurality of display electrodes; a plurality of sensor electrodes; and a processing system coupled with the plurality of display electrodes and with the plurality of sensor electrodes, wherein the processing system is configured to; drive a display signal onto at least one of the plurality of display electrodes for updating pixels of a display, drive, during a first period that at least partially overlaps with driving the display signal for updating pixels of the display, a first capacitive sensing signal having a first frequency onto at least one sensor electrode of the plurality of sensor electrodes, wherein the first frequency is synchronized with the display signal, and drive, during a second period that at least partially overlaps with driving the display signal for updating pixels of the display, a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ; and adjusting a timing of the display signal to maintain synchronization of the display signal with the second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A processing system, comprising:
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a display module configured to drive a display signal onto at least one of a plurality of display electrodes for updating pixels of a display; and a sensing module configured to; drive, during a first period that at least partially overlaps with driving the display signal for updating pixels of the display, a first capacitive sensing signal having a first frequency onto at least one sensor electrode of the plurality of sensor electrodes, wherein the first frequency is synchronized with the display signal, and drive, during a second period that at least partially overlaps with driving the display signal for updating pixels of the display, a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ, wherein the display module is further configured to adjust a timing of the display signal to maintain synchronization of the display signal with the second frequency. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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driving a display signal onto at least one of a plurality of display electrodes for updating pixels of a display, driving, during a first period that at least partially overlaps with driving the display signal for updating pixels of the display, a first capacitive sensing signal having a first frequency onto at least one sensor electrode of a plurality of sensor electrodes, wherein the first frequency is synchronized with the display signal, and driving, during a second period that at least partially overlaps with driving the display signal for updating pixels of the display, a second capacitive sensing signal having a second frequency onto the at least one sensor electrode, wherein the first and second frequencies differ; and adjusting a timing of the display signal to maintain synchronization of the display signal with the second frequency. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification