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 display driver module comprising driver circuitry, the display driver module configured to be coupled to a plurality of common electrodes configured to be driven for updating a plurality of display lines in a display screen of the display device and performing capacitive sensing, wherein the display driver module is configured to drive a first one of the plurality of common electrodes for updating a first one of the plurality of display lines during a first time period of a first display frame and drive a second one of the plurality of common electrodes for updating a second one of the plurality of display lines during a second time period of the first display frame; and
a touch driver module configured to drive a first sensor electrode for capacitive sensing during a third time period of the first display frame, the first sensor electrode comprising at least one common electrode of the plurality of common electrodes, and the third time period being at least as long as the first time period and occurring after the first time period and before the second time 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.
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Citations
21 Claims
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1. A processing system for a display device comprising an integrated capacitive sensing device, the processing system comprising:
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a display driver module comprising driver circuitry, the display driver module configured to be coupled to a plurality of common electrodes configured to be driven for updating a plurality of display lines in a display screen of the display device and performing capacitive sensing, wherein the display driver module is configured to drive a first one of the plurality of common electrodes for updating a first one of the plurality of display lines during a first time period of a first display frame and drive a second one of the plurality of common electrodes for updating a second one of the plurality of display lines during a second time period of the first display frame; and a touch driver module configured to drive a first sensor electrode for capacitive sensing during a third time period of the first display frame, the first sensor electrode comprising at least one common electrode of the plurality of common electrodes, and the third time period being at least as long as the first time period and occurring after the first time period and before the second time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for operating a capacitive sensing device, the method comprising:
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driving a first common electrode of a plurality of common electrodes for updating, during a first time period, a first display line of a first display frame; driving a second common electrode of the plurality of common electrodes for updating, during a second time period, a second display line of the first display frame; and driving a first sensor electrode for capacitive sensing during a third time period of the first display frame, the first sensor electrode comprising at least one common electrode of the plurality of common electrodes, and the third time period being at least as long as the first time period and occurring after the first time period and before the second time period. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A display device having an integrated capacitive sensing device, the display device comprising:
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a plurality of common electrodes configured to be driven for updating a plurality of display lines of a display screen of the display device and performing capacitive sensing; a plurality of receiver electrodes; and a processing system coupled to the plurality of common electrodes and to the plurality of receiver electrodes, wherein the processing system is configured to; drive a first one of the plurality of common electrodes for updating, during a first time period of a first display frame, a first one of the plurality of display lines and a second common electrode of the plurality of common electrodes for updating, during a second time period of the first display frame, a second one of the plurality of display lines; drive a first sensor electrode for capacitive sensing during a third time period of the first display frame, the first sensor electrode comprising at least one common electrode of the plurality of common electrodes, and the third time period being at least as long as the first time period and occurring after the first time period and before the second time period. - View Dependent Claims (19, 20, 21)
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Specification