Capacitive sensing during non-display update times
First Claim
1. A processing system for a display device comprising an integrated capacitive sensing device, the processing system comprising:
- a driver module comprising driver circuitry, the driver module configured to drive a plurality of sensor electrodes for capacitive sensing, wherein each of the plurality of sensor electrodes comprises at least one common electrode of a plurality of common electrodes, the plurality of common electrodes configured to be driven for display updating and capacitive sensing during a display frame, wherein the display frame comprises a plurality of display line update periods, a first blanking period, a second blanking period and a third blanking period, wherein the first blanking period and the second blanking period occur before a last one of the plurality of display line update periods and the third blanking period occurs after the last one of the plurality of display line update periods and before a first display line update period of a second display frame and wherein a duration of the second blanking period is at least as long as one of the plurality of display line updates and is longer than the first blanking period.
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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.
81 Citations
19 Claims
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1. A processing system for a display device comprising an integrated capacitive sensing device, the processing system comprising:
a driver module comprising driver circuitry, the driver module configured to drive a plurality of sensor electrodes for capacitive sensing, wherein each of the plurality of sensor electrodes comprises at least one common electrode of a plurality of common electrodes, the plurality of common electrodes configured to be driven for display updating and capacitive sensing during a display frame, wherein the display frame comprises a plurality of display line update periods, a first blanking period, a second blanking period and a third blanking period, wherein the first blanking period and the second blanking period occur before a last one of the plurality of display line update periods and the third blanking period occurs after the last one of the plurality of display line update periods and before a first display line update period of a second display frame and wherein a duration of the second blanking period is at least as long as one of the plurality of display line updates and is longer than the first blanking period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An input device comprising:
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a plurality of sensor electrodes, and a processing system coupled to the plurality of sensor electrodes, the processing system configured to; drive the plurality of sensor electrodes for capacitive sensing during a display frame of a display device to acquire a plurality of resulting signals, wherein the display frame comprises a first blanking period, a second blanking period and a third blanking period, wherein the first blanking period and the second blanking period occur before a last display line update period of the display frame and the third blanking period occurs after the last display line update period of the display frame, wherein a duration of the second blanking period is at least as long the last display line update and is longer than the first blanking period; and determine positional information for an input object based on the resulting signals. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of capacitive sensing, the method comprising:
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driving a plurality of sensor electrodes for capacitive sensing during a display frame of a display device to acquire a plurality of resulting signals, wherein the display frame comprises a first blanking period set, a second blanking period set and a third blanking period set, wherein the first blanking period set has a greater number of blanking periods than that of the second blanking period set, wherein the second blanking period set has a greater number of blanking periods than that of the third blanking period set, wherein each blanking period of the second blanking period set is longer than each blanking period of the first blanking period set, and wherein driving the plurality of sensor electrodes for capacitive sensing during the display frame comprises driving a first sensor electrode for capacitive sensing during a first blanking period of the second blanking period set; and determining positional information for an input object based on the plurality of resulting signals. - View Dependent Claims (17, 18, 19)
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Specification