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 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 driver module is configured to drive a first one of the common electrodes for updating a first one of the display lines during a first time period of a first display frame and drive a second one of the common electrodes for updating a second one of the display lines during a second time period of the first display frame, andwherein the driver module is further configured to drive a first transmitter electrode for capacitive sensing during a third time period of the first display frame, 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, wherein the first transmitter electrode comprises at least two electrodes of the plurality of common electrodes;
a receiver module coupled to a plurality of receiver electrodes and configured to receive resulting signals while driving the first transmitter electrode during the third time period; and
a determination module configured to determine positional information for an input object based on the resulting signals.
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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.
84 Citations
22 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 driver module comprising driver circuitry, the driver module 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 driver module is configured to drive a first one of the common electrodes for updating a first one of the display lines during a first time period of a first display frame and drive a second one of the common electrodes for updating a second one of the display lines during a second time period of the first display frame, and wherein the driver module is further configured to drive a first transmitter electrode for capacitive sensing during a third time period of the first display frame, 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, wherein the first transmitter electrode comprises at least two electrodes of the plurality of common electrodes; a receiver module coupled to a plurality of receiver electrodes and configured to receive resulting signals while driving the first transmitter electrode during the third time period; and a determination module configured to determine positional information for an input object based on the resulting signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a display device comprising an integrated 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; driving a first transmitter electrode for capacitive sensing during a third time period of the first display frame, 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, wherein the first transmitter electrode comprises at least two electrodes of the plurality of common electrodes; receiving resulting signals on a plurality of receiver electrodes while driving the first transmitter electrode during the third time period; and determining positional information for an input object based on the resulting signals. - View Dependent Claims (12, 13, 14, 15, 16)
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17. 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 processor coupled to the plurality of common electrodes and to the plurality of receiver electrodes, wherein the processor is configured to drive a first one of the common electrodes for updating, during a first time period of a first display frame, a first one of the display lines and a second common electrode for updating, during a second time period of the first display frame, a second one of the display lines, wherein the processor is further configured to; drive a first transmitter electrode for capacitive sensing during a third time period of the first display frame, 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, wherein the first transmitter electrode comprises at least two electrodes of the plurality of common electrodes; receive resulting signals on at least one of the plurality of receiver electrodes while driving the first transmitter electrode during the third time period; and determine positional information for an input object based on the resulting signals. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification