System and method for interference avoidance for a display device comprising an integrated sensing device
First Claim
1. A processing system for a display device having an integrated capacitive sensing device, the processing system comprising:
- a driver module comprising driver circuitry coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing, wherein the driver module is configured to;
drive a first common electrode for display updating a first display line during a first display line update period of a first display frame, the first display frame occurring at a pre-determined display frame rate,drive a second common electrode for display updating a second display line during a second display line update period of the first display frame,drive a first common electrode set comprising at least one of the plurality of common electrodes for capacitive sensing at a capacitive frame rate during a first non-display update period of the first display frame, the first non-display update period occurring after the first display line update period and before the second display line update period, and the first non-display update period being at least as long as the first display line update period, wherein display updating is paused during the first non-display update period;
operate a second common electrode set comprising at least one of the plurality of common electrodes for interference detection during a second non-display update period;
a receiver module coupled to a plurality of receiver electrodes and configured to receive first resulting signals with the plurality of receiver electrodes during the first non-display update period and second resulting signals during the second non-display update period; and
a determination module configured to determine an interference measurement based at least in part on the second resulting signals, wherein an amount of the first non-display update period which is used for capacitive sensing is adjusted based on the interference measurement.
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Abstract
Embodiments of the invention generally provide an input device with display screens that periodically update (refresh) the screen by selectively driving electrodes corresponding to pixels in a display line. In addition to updating the display, the input device may perform capacitive sensing using the display screen as a touch area. To do this, the input device uses common electrodes for both updating the display and performing capacitive sensing, and interleaves periods of capacitive sensing between periods of updating the display lines (and pixels) based on a display frame. To avoid noise and mitigate interference during capacitive sensing, the input device may change the capacitive frame rate relative to the display frame rate based on measurements of interference. The changed capacitive frame rate may result in re-timed periods of capacitive sensing based on each display frame.
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Citations
21 Claims
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1. A processing system for a display device having an integrated capacitive sensing device, the processing system comprising:
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a driver module comprising driver circuitry coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing, wherein the driver module is configured to; drive a first common electrode for display updating a first display line during a first display line update period of a first display frame, the first display frame occurring at a pre-determined display frame rate, drive a second common electrode for display updating a second display line during a second display line update period of the first display frame, drive a first common electrode set comprising at least one of the plurality of common electrodes for capacitive sensing at a capacitive frame rate during a first non-display update period of the first display frame, the first non-display update period occurring after the first display line update period and before the second display line update period, and the first non-display update period being at least as long as the first display line update period, wherein display updating is paused during the first non-display update period; operate a second common electrode set comprising at least one of the plurality of common electrodes for interference detection during a second non-display update period; a receiver module coupled to a plurality of receiver electrodes and configured to receive first resulting signals with the plurality of receiver electrodes during the first non-display update period and second resulting signals during the second non-display update period; and a determination module configured to determine an interference measurement based at least in part on the second resulting signals, wherein an amount of the first non-display update period which is used for capacitive sensing is adjusted based on the interference measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. A processing system for a display device having an integrated capacitive sensing device, the processing system comprising:
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a driver module comprising driver circuitry coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing, wherein the driver module is configured to; drive a first common electrode for display updating a first display line during a first display line update period of a first display frame, the first display frame occurring at a display frame rate, drive a second common electrode for display updating a second display line during a second display line update period of the first display frame, drive a first common electrode set comprising at least one of the plurality of common electrodes for capacitive sensing during a first non-display update period at a capacitive frame rate, wherein the first non-display update period occurs after the first display line update period and before the second display line update period, and the first non-display update period being at least as long as the first display line update period, wherein display updating is paused during the first non-display update period, and operate a second common electrode set comprising at least one of the plurality of common electrodes for interference detection during a second non-display update period; a receiver module coupled to a plurality of receiver electrodes and configured to receive first resulting signals with the plurality of receiver electrodes during the first non-display update period and second resulting signals during the second non-display update period; and a determination module configured to determine an interference measurement based at least in part on the second resulting signals, wherein the determination module is further configured to adjust an amount of capacitive frames per display frame based on the interference measurement. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for operating a display device having an integrated capacitive sensing device, the method comprising:
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driving, a first common electrode of a plurality of common electrodes for display updating a first display line during a first display line update period of a first display frame, the first display frame occurring at a display frame rate, wherein the plurality of common electrodes are configured for display updating and capacitive sensing; driving a second common electrode of the plurality of common electrodes for display updating a second display line during a second display line update period of the first display frame; operating a first common electrode set comprising at least one of the plurality of common electrodes for interference detection; receiving first resulting signals from a plurality of receiver electrodes while operating the first common electrode set for interference detection; determining an interference measurement based at least in part on the first resulting signals; adjusting an amount of a first non-display update period which is used for capacitive sensing based on the interference measurement; and driving a second common electrode set comprising at least one of the plurality of common electrodes for capacitive sensing during the amount of the first non-display update period of the first display frame at a capacitive frame rate, the first non-display update period occurring after the first display line update period and before the second display line update period, and the first non-display update period being at least as long as the first display line update period, wherein display updating is paused during the first non-display update period. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification