Capacitive sensing during non-display update times
First Claim
1. A processing system for a display device comprising a plurality of common electrodes, at least one of the plurality of common electrodes comprised by a plurality of sensor electrodes and configured to be driven for updating a display of the display device and capacitive sensing, during a display frame, the processing system comprising:
- a driver module comprising driver circuitry, the driver module configured to couple to the plurality of sensor electrodes, wherein the display frame comprises a plurality of display line update periods, a plurality of first blanking periods, and a plurality of second blanking periods, wherein the plurality of first blanking periods includes horizontal blanking periods occurring at the end of corresponding ones of the plurality of display line update periods and the plurality of second blanking periods includes capacitive sensing periods, wherein each of the plurality of second blanking periods occurs between respective clusters of the plurality of display line update periods, each cluster comprising at least two of the plurality of display line update periods, and wherein each of the plurality of second blanking periods is longer than each of the plurality of first blanking periods, andwherein the driver module is configured to drive a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a first one of the plurality of second blanking periods.
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Accused Products
Abstract
Embodiments of the invention generally provide an input device with display screens that periodically update (refresh) the screen by selectively driving common electrodes corresponding to pixels in a display line. In general, the input devices drive each electrode until each display line (and each pixel) of a display frame is updated. In addition to updating the display, the input device may perform capacitive sensing using the display screen as a proximity sensing area. To do this, the input device may interleave periods of capacitive sensing between periods of updating the display based on a display frame. For example, the input device may update the first half of display lines of the display screen, pause display updating, perform capacitive sensing, and finish updating the rest of the display lines. Further still, the input device may use common electrodes for both updating the display and performing capacitive sensing.
76 Citations
20 Claims
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1. A processing system for a display device comprising a plurality of common electrodes, at least one of the plurality of common electrodes comprised by a plurality of sensor electrodes and configured to be driven for updating a display of the display device and capacitive sensing, during a display frame, the processing system comprising:
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a driver module comprising driver circuitry, the driver module configured to couple to the plurality of sensor electrodes, wherein the display frame comprises a plurality of display line update periods, a plurality of first blanking periods, and a plurality of second blanking periods, wherein the plurality of first blanking periods includes horizontal blanking periods occurring at the end of corresponding ones of the plurality of display line update periods and the plurality of second blanking periods includes capacitive sensing periods, wherein each of the plurality of second blanking periods occurs between respective clusters of the plurality of display line update periods, each cluster comprising at least two of the plurality of display line update periods, and wherein each of the plurality of second blanking periods is longer than each of the plurality of first blanking periods, and wherein the driver module is configured to drive a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a first one of the plurality of second blanking periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An input device comprising:
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a plurality of sensor electrodes of a display device; a plurality of common electrodes, at least one of the plurality of common electrodes comprised by the plurality of sensor electrodes; and a processing system coupled to the plurality of sensor and common electrodes, wherein the processing system is configured to; drive the plurality of sensor and common electrodes for updating a display of the display device and capacitive sensing, during a display frame, wherein the display frame comprises a plurality of display line update periods, a plurality of first blanking periods, and a plurality of second blanking periods, wherein the plurality of first blanking periods includes horizontal blanking periods occurring at the end of corresponding ones of the plurality of display line update periods and the plurality of second blanking periods includes capacitive sensing periods, wherein at least a first one of the plurality of second blanking periods occurs between at least a first one of a plurality of clusters of the plurality of display line update periods, each cluster comprising at least two display line update periods of the plurality of display line update periods, and wherein each of the plurality of second blanking periods is longer than each of the plurality of first blanking periods; and drive a first sensor electrode of the plurality of sensor electrodes for capacitive sensing during a first one of the plurality of second blanking periods. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for capacitive sensing, the method comprising:
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providing a plurality of common electrodes, at least one of the plurality of common electrodes comprised by a plurality of sensor electrodes and configured to be driven for updating a display of a display device and capacitive sensing, during a display frame, providing a driver module, driving a first sensor electrode of the plurality of sensor electrodes that is a common electrode, with the driver module, for capacitive sensing during a first one of a plurality of second blanking periods of the display frame, wherein the display frame comprises a plurality of display line update periods, a plurality of first blanking periods and the plurality of second blanking periods, wherein the plurality of first blanking periods includes horizontal blanking periods occurring at the end of corresponding ones of the plurality of display line update periods, and the plurality of second blanking periods include capacitive sensing periods, wherein each of the plurality of second blanking periods is longer than each of the plurality of first blanking periods, and wherein each of the plurality of second blanking periods occurs between respective clusters of the plurality of display line update periods, each cluster comprising at least two of the plurality of display line update periods. - View Dependent Claims (19, 20)
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Specification