Touch noise canceling for dot-inversion driving scheme
First Claim
1. A processing system configured for updating an array of sub-pixel elements and performing capacitive sensing, the processing system comprising:
- a display driver configured to be coupled to a first sub-pixel element and a second sub-pixel element of the array, wherein the first and second sub-pixel elements are configured to be coupled to a source driver via a first source line and provided on adjacent rows of the array, the display driver configured to;
drive the first sub-pixel element with a first update signal during a first display update period; and
drive the second sub-pixel element with a second update signal during the first display update period, wherein the first and second update signals are opposite in polarity; and
sensor circuitry configured to mitigate corrupting currents induced by the first and second update signals in a first sensor electrode routing located proximate to the first source line by;
receiving first resulting signals via the first sensor electrode routing when an even number of rows in the array of sub-pixel elements are driven for display updates, wherein the first resulting signals are received during a first sensing period that at least partially overlaps the first display update period.
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Accused Products
Abstract
Techniques for removing display-based corrupting components from a capacitive sensing signal are provided. A routing carrying display related signals (e.g., a source signal for sub-pixel updating) may induce corrupting current into a routing for carrying capacitive sensing signals. This corrupting current may reduce the ability to determine presence of an input object via the sensing signal. Therefore, the corrupting signal is effectively removed by driving the display elements with a dot inversion technique and by performing capacitive sensing for a sensor electrode during a time in which an even number of display rows are driven for display updates. Dot inversion causes the corrupting current to alternate polarity. Thus, driving sensor electrodes in a period of time in which an even number of rows is driven means that an equal number of positive and negative polarity corrupting currents are induced into the sensing signal.
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Citations
18 Claims
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1. A processing system configured for updating an array of sub-pixel elements and performing capacitive sensing, the processing system comprising:
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a display driver configured to be coupled to a first sub-pixel element and a second sub-pixel element of the array, wherein the first and second sub-pixel elements are configured to be coupled to a source driver via a first source line and provided on adjacent rows of the array, the display driver configured to; drive the first sub-pixel element with a first update signal during a first display update period; and drive the second sub-pixel element with a second update signal during the first display update period, wherein the first and second update signals are opposite in polarity; and sensor circuitry configured to mitigate corrupting currents induced by the first and second update signals in a first sensor electrode routing located proximate to the first source line by; receiving first resulting signals via the first sensor electrode routing when an even number of rows in the array of sub-pixel elements are driven for display updates, wherein the first resulting signals are received during a first sensing period that at least partially overlaps the first display update period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An input device configured for updating a display and performing capacitive sensing, the input device comprising:
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an array of sub-pixel elements configured to be coupled to a processing system via a plurality of source lines, the plurality of source lines including at least a first source line; a plurality of sensor electrodes configured to be coupled to the processing system via a plurality of sensor electrode routings, the plurality of sensor electrode routings including at least a first sensor electrode routing located proximate to the first source line; a display driver configured to be coupled to a first sub-pixel element and a second sub-pixel element of the array, wherein the first and second sub-pixel elements are configured to be coupled to the first source line and provided on adjacent rows of the array, the display driver configured to; drive the first sub-pixel element with a first update signal having a first polarity during a first display update period; and drive the second sub-pixel element with a second update signal having a second polarity during the first display update period, wherein the first polarity is opposite the second polarity; and sensor circuitry configured to mitigate corrupting currents induced by the first and second update signals in the first sensor electrode routing by; receiving first resulting signals via the first sensor electrode routing when an even number of rows in the array of sub-pixel elements are driven for display updates, wherein the first resulting signals are received during a first sensing period that at least partially overlaps the first display update period. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for updating an array of sub-pixel elements and performing capacitive sensing, the method comprising:
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driving a first sub-pixel element of the array with a first update signal during a first display update period; driving a second sub-pixel element of the array with a second update signal during the first display update period, wherein the first and second sub-pixel elements are coupled to a source driver via a first source line and provided on adjacent rows of the array, and wherein the first and second update signals are opposite in polarity; and receiving resulting signals via a sensor electrode routing during a first sensing period when an even number of rows in the array of sub-pixel elements are driven for display updates, to mitigate corrupting currents induced by the first and second update signals in a sensor electrode routing located proximate to the first source line, wherein the first sensing period at least partially overlaps the first display update period. - View Dependent Claims (18)
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Specification