Reducing floating ground effects in pixelated self-capacitance touch screens
First Claim
1. A touch controller comprising:
- sense circuitry configured to be coupled to a plurality of touch pixel electrodes arranged in rows on a touch sensor panel, each touch pixel electrode of the plurality of touch pixel electrodes corresponding to a unique horizontal and a unique vertical position on the touch sensor panel, the sense circuitry configured to;
during a first time period, drive and sense self-capacitances of a first plurality of touch pixel electrodes of the plurality of touch pixel electrodes using a first voltage signal while concurrently driving a second plurality of touch pixel electrodes of the plurality of touch pixel electrodes at a reference voltage, different from the first voltage signal; and
during a second time period, drive and sense self-capacitances of the second plurality of touch pixel electrodes using a second voltage signal while concurrently driving the first plurality of touch pixel electrodes at the reference voltage, different from the second voltage signal, wherein each row of the rows of touch pixel electrodes on the touch sensor panel includes touch pixel electrodes from the first plurality of touch pixel electrodes and touch pixel electrodes from the second plurality of touch pixel electrodes alternately arranged along the row.
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Accused Products
Abstract
A touch controller is disclosed. In some examples, the touch controller can include sense circuitry configured to be coupled to a first touch pixel and a second touch pixel on a touch sensor panel. In some examples, the sense circuitry can be configured to drive and sense the first touch pixel during a first time period while coupling the second touch pixel to a reference voltage. In some examples, the sense circuitry can be configured to drive and sense the second touch pixel during a second time period while coupling the first touch pixel to the reference voltage. In some examples, the reference voltage can be a system ground of the touch controller. In some examples, the sense circuitry can be configured to drive and sense pluralities of touch pixels in a similar manner.
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Citations
24 Claims
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1. A touch controller comprising:
sense circuitry configured to be coupled to a plurality of touch pixel electrodes arranged in rows on a touch sensor panel, each touch pixel electrode of the plurality of touch pixel electrodes corresponding to a unique horizontal and a unique vertical position on the touch sensor panel, the sense circuitry configured to; during a first time period, drive and sense self-capacitances of a first plurality of touch pixel electrodes of the plurality of touch pixel electrodes using a first voltage signal while concurrently driving a second plurality of touch pixel electrodes of the plurality of touch pixel electrodes at a reference voltage, different from the first voltage signal; and during a second time period, drive and sense self-capacitances of the second plurality of touch pixel electrodes using a second voltage signal while concurrently driving the first plurality of touch pixel electrodes at the reference voltage, different from the second voltage signal, wherein each row of the rows of touch pixel electrodes on the touch sensor panel includes touch pixel electrodes from the first plurality of touch pixel electrodes and touch pixel electrodes from the second plurality of touch pixel electrodes alternately arranged along the row. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a touch sensor panel, the touch sensor panel including a plurality of touch pixel electrodes arranged in rows on the touch sensor panel, each touch pixel electrode of the plurality of touch pixel electrodes corresponding to a unique horizontal and a unique vertical position on the touch sensor panel, the method comprising:
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during a first time period; driving and sensing self-capacitances of a first plurality of touch pixel electrodes of the plurality of touch pixel electrodes on the touch sensor panel using a first voltage signal while concurrently driving a second plurality of touch pixel electrodes of the plurality of touch pixel electrodes on the touch sensor panel at a reference voltage, different from the first voltage signal; and during a second time period; driving and sensing self-capacitances of the second plurality of touch pixel electrodes of the plurality of touch pixel electrodes using a second voltage signal while concurrently driving the first plurality of touch pixel electrodes of the plurality of touch pixel electrodes at the reference voltage, different from the second voltage signal, wherein each row of the rows of touch pixel electrodes on the touch sensor panel includes touch pixel electrodes from the first plurality of touch pixel electrodes and touch pixel electrodes from the second plurality of touch pixel electrodes alternately arranged along the row. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification