Distributed blanking for touch optimization
First Claim
1. A processing system for a display device, the processing system comprising:
- a driver module comprising driver circuitry, the driver module is configured to receive display frame updates and to drive a plurality of common electrodes for capacitive sensing and updating the display device,wherein the driver module is configured to (i) drive at least a first one of the common electrodes for updating, during a first time period of a first display frame, the display device based on at least a first portion of the first display frame, (ii) drive a transmitter electrode for capacitive sensing during a second time period of the first display frame, the transmitter electrode comprising at least one of the plurality of common electrodes, and (iii) drive at least a second one of the common electrodes for updating, during a third time period of the first display frame, the display device based on at least a second portion of the first display frame, wherein the second time period is at least as long as the first time period and occurring after the first time period and before the third time period,wherein receiving the display frame updates comprises controlling receipt of the display frame updates to pause updating of the display device during the second time period;
a receiver module coupled to a plurality of receiver electrodes and configured to receive resulting signals while driving the transmitter electrode during the second 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.
79 Citations
21 Claims
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1. A processing system for a display device, the processing system comprising:
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a driver module comprising driver circuitry, the driver module is configured to receive display frame updates and to drive a plurality of common electrodes for capacitive sensing and updating the display device, wherein the driver module is configured to (i) drive at least a first one of the common electrodes for updating, during a first time period of a first display frame, the display device based on at least a first portion of the first display frame, (ii) drive a transmitter electrode for capacitive sensing during a second time period of the first display frame, the transmitter electrode comprising at least one of the plurality of common electrodes, and (iii) drive at least a second one of the common electrodes for updating, during a third time period of the first display frame, the display device based on at least a second portion of the first display frame, wherein the second time period is at least as long as the first time period and occurring after the first time period and before the third time period, wherein receiving the display frame updates comprises controlling receipt of the display frame updates to pause updating of the display device during the second time period; a receiver module coupled to a plurality of receiver electrodes and configured to receive resulting signals while driving the transmitter electrode during the second 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, the method comprising:
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receiving display frame updates for updating the display device; driving a first common electrode of a plurality of common electrodes for updating, during a first time period of a first display frame, the display device based on at least a first portion of the first display frame; driving a transmitter electrode for capacitive sensing during a second time period of the first display frame, the transmitter electrode comprising at least one of the plurality of common electrodes, driving a second common electrode of the plurality of common electrodes for updating, during a third time period of the first display frame, the display device based on at least a second portion of the first display frame, wherein the second time period is at least as long as the first time period and occurring after the first time period and before the third time period; controlling receipt of the display frame updates to pause updating the display device during the second time period; receiving resulting signals on a plurality of receiver electrodes while driving the transmitter electrode during the second 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 capacitive sensing and updating the display device; a plurality of receiver electrodes; a processor configured to receive display frame updates from a video source, wherein the processor is configured to (i) drive a first one of the plurality of common electrodes for updating, during a first time period of a first display frame, the display device based on a first portion of the first display frame, (ii) drive a transmitter electrode for capacitive sensing during a second time period of the first display frame, the transmitter electrode comprising at least one of the plurality of common electrodes, and (iii) drive a second one of the plurality of common electrodes for updating, during a third time period of the first display frame, the display device based on a second portion of the first display frame, wherein the second time period is at least as long as the first time period and occurring after the first time period and before the third time period, and wherein receiving the display frame updates comprises controlling receipt of the display frame updates to pause updating of the display device during the second time period; a receiver module configured to receive resulting signals on the plurality of receiver electrodes while driving the transmitter electrode during the second time period; and a determination module configured to determine positional information for an input object based on the resulting signals. - View Dependent Claims (18, 19, 20, 21)
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Specification