NEGATIVE PIXEL COMPENSATION
First Claim
1. A circuit comprising:
- multiple first lines, each first line configured to be switchable;
multiple second lines configured to associate with the first lines; and
switching circuitry coupled to at least the first lines and configured to operate the circuit in a configuration for measuring a grounding condition of an object proximate to the circuit by switching at least one of the first lines to transmit a stimulation signal and at least another of the first lines to transmit a capacitance signal indicative of the grounding condition of the object.
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Accused Products
Abstract
Negative pixel compensation to compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the device is disclosed. To do so, the device can switch to a configuration to measure the grounding condition of the touching object and use the measurement to compensate the touch output values. In the switched configuration, a first set of lines of the device can be switched between a coupling to a stimulation signal input to drive the device, a coupling to a capacitance signal output to output a signal indicative of the object'"'"'s grounding condition, and a coupling to ground. A second set of lines of the device can be coupled to a touch signal output to output a signal indicative of the object'"'"'s touch at the device. The grounding signal can be applied to the touch signal to compensate for the negative pixel effect.
41 Citations
23 Claims
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1. A circuit comprising:
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multiple first lines, each first line configured to be switchable; multiple second lines configured to associate with the first lines; and switching circuitry coupled to at least the first lines and configured to operate the circuit in a configuration for measuring a grounding condition of an object proximate to the circuit by switching at least one of the first lines to transmit a stimulation signal and at least another of the first lines to transmit a capacitance signal indicative of the grounding condition of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit comprising:
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multiple first lines, at least one of the first lines being configured to drive the circuit with a stimulation signal and at least one other first line being configured to sense a first capacitance between an object proximate to the circuit and ground; multiple second lines associated with to the first lines to form pixels and configured to sense a second capacitance at the pixels indicative of a touch by the object; and a processor programmable for compensating the second capacitance with the first capacitance based on a grounding condition of the object. - View Dependent Claims (12, 13, 14)
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15. A method comprising:
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configuring at least one drive line of a touch sensitive device having multiple drive and sense lines to receive a stimulation signal; configuring at least one other drive line to sense a grounding condition of an object touching the device; and compensating sense signals detected on one or more sense lines based on the sensed grounding condition. - View Dependent Claims (16, 17, 18, 19)
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20. A touch sensitive device comprising:
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a touch sensor panel configured to sense an object proximate thereto; scan logic couplable to the touch sensor panel and configured to perform a scan sequence on the panel to measure a touch by the object at the panel and to measure grounding of the object; and a processor configured to compensate touch measurements according to grounding measurements. - View Dependent Claims (21, 22, 23)
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Specification